source "drivers/counter/Kconfig"
+source "drivers/most/Kconfig"
endmenu
obj-$(CONFIG_GNSS) += gnss/
obj-$(CONFIG_INTERCONNECT) += interconnect/
obj-$(CONFIG_COUNTER) += counter/
+obj-$(CONFIG_MOST) += most/
--- /dev/null
+# SPDX-License-Identifier: GPL-2.0
+menuconfig MOST
+ tristate "MOST support"
+ depends on HAS_DMA && CONFIGFS_FS
+ default n
+ help
+ Say Y here if you want to enable MOST support.
+ This driver needs at least one additional component to enable the
+ desired access from userspace (e.g. character devices) and one that
+ matches the network controller's hardware interface (e.g. USB).
+
+ To compile this driver as a module, choose M here: the
+ module will be called most_core.
+
+ If in doubt, say N here.
--- /dev/null
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_MOST) += most_core.o
+most_core-y := core.o \
+ configfs.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * configfs.c - Implementation of configfs interface to the driver stack
+ *
+ * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/configfs.h>
+#include <linux/most.h>
+
+#define MAX_STRING_SIZE 80
+
+struct mdev_link {
+ struct config_item item;
+ struct list_head list;
+ bool create_link;
+ bool destroy_link;
+ u16 num_buffers;
+ u16 buffer_size;
+ u16 subbuffer_size;
+ u16 packets_per_xact;
+ u16 dbr_size;
+ char datatype[MAX_STRING_SIZE];
+ char direction[MAX_STRING_SIZE];
+ char name[MAX_STRING_SIZE];
+ char device[MAX_STRING_SIZE];
+ char channel[MAX_STRING_SIZE];
+ char comp[MAX_STRING_SIZE];
+ char comp_params[MAX_STRING_SIZE];
+};
+
+static struct list_head mdev_link_list;
+
+static int set_cfg_buffer_size(struct mdev_link *link)
+{
+ return most_set_cfg_buffer_size(link->device, link->channel,
+ link->buffer_size);
+}
+
+static int set_cfg_subbuffer_size(struct mdev_link *link)
+{
+ return most_set_cfg_subbuffer_size(link->device, link->channel,
+ link->subbuffer_size);
+}
+
+static int set_cfg_dbr_size(struct mdev_link *link)
+{
+ return most_set_cfg_dbr_size(link->device, link->channel,
+ link->dbr_size);
+}
+
+static int set_cfg_num_buffers(struct mdev_link *link)
+{
+ return most_set_cfg_num_buffers(link->device, link->channel,
+ link->num_buffers);
+}
+
+static int set_cfg_packets_xact(struct mdev_link *link)
+{
+ return most_set_cfg_packets_xact(link->device, link->channel,
+ link->packets_per_xact);
+}
+
+static int set_cfg_direction(struct mdev_link *link)
+{
+ return most_set_cfg_direction(link->device, link->channel,
+ link->direction);
+}
+
+static int set_cfg_datatype(struct mdev_link *link)
+{
+ return most_set_cfg_datatype(link->device, link->channel,
+ link->datatype);
+}
+
+static int (*set_config_val[])(struct mdev_link *link) = {
+ set_cfg_buffer_size,
+ set_cfg_subbuffer_size,
+ set_cfg_dbr_size,
+ set_cfg_num_buffers,
+ set_cfg_packets_xact,
+ set_cfg_direction,
+ set_cfg_datatype,
+};
+
+static struct mdev_link *to_mdev_link(struct config_item *item)
+{
+ return container_of(item, struct mdev_link, item);
+}
+
+static int set_config_and_add_link(struct mdev_link *mdev_link)
+{
+ int i;
+ int ret;
+
+ for (i = 0; i < ARRAY_SIZE(set_config_val); i++) {
+ ret = set_config_val[i](mdev_link);
+ if (ret < 0 && ret != -ENODEV) {
+ pr_err("Config failed\n");
+ return ret;
+ }
+ }
+
+ return most_add_link(mdev_link->device, mdev_link->channel,
+ mdev_link->comp, mdev_link->name,
+ mdev_link->comp_params);
+}
+
+static ssize_t mdev_link_create_link_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ bool tmp;
+ int ret;
+
+ ret = kstrtobool(page, &tmp);
+ if (ret)
+ return ret;
+ if (!tmp)
+ return count;
+ ret = set_config_and_add_link(mdev_link);
+ if (ret && ret != -ENODEV)
+ return ret;
+ list_add_tail(&mdev_link->list, &mdev_link_list);
+ mdev_link->create_link = tmp;
+ mdev_link->destroy_link = false;
+
+ return count;
+}
+
+static ssize_t mdev_link_destroy_link_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ bool tmp;
+ int ret;
+
+ ret = kstrtobool(page, &tmp);
+ if (ret)
+ return ret;
+ if (!tmp)
+ return count;
+
+ ret = most_remove_link(mdev_link->device, mdev_link->channel,
+ mdev_link->comp);
+ if (ret)
+ return ret;
+ if (!list_empty(&mdev_link_list))
+ list_del(&mdev_link->list);
+
+ mdev_link->destroy_link = tmp;
+
+ return count;
+}
+
+static ssize_t mdev_link_direction_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->direction);
+}
+
+static ssize_t mdev_link_direction_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+
+ if (!sysfs_streq(page, "dir_rx") && !sysfs_streq(page, "rx") &&
+ !sysfs_streq(page, "dir_tx") && !sysfs_streq(page, "tx"))
+ return -EINVAL;
+ strcpy(mdev_link->direction, page);
+ strim(mdev_link->direction);
+ return count;
+}
+
+static ssize_t mdev_link_datatype_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->datatype);
+}
+
+static ssize_t mdev_link_datatype_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+
+ if (!sysfs_streq(page, "control") && !sysfs_streq(page, "async") &&
+ !sysfs_streq(page, "sync") && !sysfs_streq(page, "isoc") &&
+ !sysfs_streq(page, "isoc_avp"))
+ return -EINVAL;
+ strcpy(mdev_link->datatype, page);
+ strim(mdev_link->datatype);
+ return count;
+}
+
+static ssize_t mdev_link_device_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->device);
+}
+
+static ssize_t mdev_link_device_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+
+ strlcpy(mdev_link->device, page, sizeof(mdev_link->device));
+ strim(mdev_link->device);
+ return count;
+}
+
+static ssize_t mdev_link_channel_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->channel);
+}
+
+static ssize_t mdev_link_channel_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+
+ strlcpy(mdev_link->channel, page, sizeof(mdev_link->channel));
+ strim(mdev_link->channel);
+ return count;
+}
+
+static ssize_t mdev_link_comp_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->comp);
+}
+
+static ssize_t mdev_link_comp_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+
+ strlcpy(mdev_link->comp, page, sizeof(mdev_link->comp));
+ strim(mdev_link->comp);
+ return count;
+}
+
+static ssize_t mdev_link_comp_params_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%s\n",
+ to_mdev_link(item)->comp_params);
+}
+
+static ssize_t mdev_link_comp_params_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+
+ strlcpy(mdev_link->comp_params, page, sizeof(mdev_link->comp_params));
+ strim(mdev_link->comp_params);
+ return count;
+}
+
+static ssize_t mdev_link_num_buffers_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n",
+ to_mdev_link(item)->num_buffers);
+}
+
+static ssize_t mdev_link_num_buffers_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ int ret;
+
+ ret = kstrtou16(page, 0, &mdev_link->num_buffers);
+ if (ret)
+ return ret;
+ return count;
+}
+
+static ssize_t mdev_link_buffer_size_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n",
+ to_mdev_link(item)->buffer_size);
+}
+
+static ssize_t mdev_link_buffer_size_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ int ret;
+
+ ret = kstrtou16(page, 0, &mdev_link->buffer_size);
+ if (ret)
+ return ret;
+ return count;
+}
+
+static ssize_t mdev_link_subbuffer_size_show(struct config_item *item,
+ char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n",
+ to_mdev_link(item)->subbuffer_size);
+}
+
+static ssize_t mdev_link_subbuffer_size_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ int ret;
+
+ ret = kstrtou16(page, 0, &mdev_link->subbuffer_size);
+ if (ret)
+ return ret;
+ return count;
+}
+
+static ssize_t mdev_link_packets_per_xact_show(struct config_item *item,
+ char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n",
+ to_mdev_link(item)->packets_per_xact);
+}
+
+static ssize_t mdev_link_packets_per_xact_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ int ret;
+
+ ret = kstrtou16(page, 0, &mdev_link->packets_per_xact);
+ if (ret)
+ return ret;
+ return count;
+}
+
+static ssize_t mdev_link_dbr_size_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n", to_mdev_link(item)->dbr_size);
+}
+
+static ssize_t mdev_link_dbr_size_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ int ret;
+
+ ret = kstrtou16(page, 0, &mdev_link->dbr_size);
+ if (ret)
+ return ret;
+ return count;
+}
+
+CONFIGFS_ATTR_WO(mdev_link_, create_link);
+CONFIGFS_ATTR_WO(mdev_link_, destroy_link);
+CONFIGFS_ATTR(mdev_link_, device);
+CONFIGFS_ATTR(mdev_link_, channel);
+CONFIGFS_ATTR(mdev_link_, comp);
+CONFIGFS_ATTR(mdev_link_, comp_params);
+CONFIGFS_ATTR(mdev_link_, num_buffers);
+CONFIGFS_ATTR(mdev_link_, buffer_size);
+CONFIGFS_ATTR(mdev_link_, subbuffer_size);
+CONFIGFS_ATTR(mdev_link_, packets_per_xact);
+CONFIGFS_ATTR(mdev_link_, datatype);
+CONFIGFS_ATTR(mdev_link_, direction);
+CONFIGFS_ATTR(mdev_link_, dbr_size);
+
+static struct configfs_attribute *mdev_link_attrs[] = {
+ &mdev_link_attr_create_link,
+ &mdev_link_attr_destroy_link,
+ &mdev_link_attr_device,
+ &mdev_link_attr_channel,
+ &mdev_link_attr_comp,
+ &mdev_link_attr_comp_params,
+ &mdev_link_attr_num_buffers,
+ &mdev_link_attr_buffer_size,
+ &mdev_link_attr_subbuffer_size,
+ &mdev_link_attr_packets_per_xact,
+ &mdev_link_attr_datatype,
+ &mdev_link_attr_direction,
+ &mdev_link_attr_dbr_size,
+ NULL,
+};
+
+static void mdev_link_release(struct config_item *item)
+{
+ struct mdev_link *mdev_link = to_mdev_link(item);
+ int ret;
+
+ if (mdev_link->destroy_link)
+ goto free_item;
+
+ ret = most_remove_link(mdev_link->device, mdev_link->channel,
+ mdev_link->comp);
+ if (ret) {
+ pr_err("Removing link failed.\n");
+ goto free_item;
+ }
+
+ if (!list_empty(&mdev_link_list))
+ list_del(&mdev_link->list);
+
+free_item:
+ kfree(to_mdev_link(item));
+}
+
+static struct configfs_item_operations mdev_link_item_ops = {
+ .release = mdev_link_release,
+};
+
+static const struct config_item_type mdev_link_type = {
+ .ct_item_ops = &mdev_link_item_ops,
+ .ct_attrs = mdev_link_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+struct most_common {
+ struct config_group group;
+ struct module *mod;
+ struct configfs_subsystem subsys;
+};
+
+static struct most_common *to_most_common(struct configfs_subsystem *subsys)
+{
+ return container_of(subsys, struct most_common, subsys);
+}
+
+static struct config_item *most_common_make_item(struct config_group *group,
+ const char *name)
+{
+ struct mdev_link *mdev_link;
+ struct most_common *mc = to_most_common(group->cg_subsys);
+
+ mdev_link = kzalloc(sizeof(*mdev_link), GFP_KERNEL);
+ if (!mdev_link)
+ return ERR_PTR(-ENOMEM);
+
+ if (!try_module_get(mc->mod)) {
+ kfree(mdev_link);
+ return ERR_PTR(-ENOLCK);
+ }
+ config_item_init_type_name(&mdev_link->item, name,
+ &mdev_link_type);
+
+ if (!strcmp(group->cg_item.ci_namebuf, "most_cdev"))
+ strcpy(mdev_link->comp, "cdev");
+ else if (!strcmp(group->cg_item.ci_namebuf, "most_net"))
+ strcpy(mdev_link->comp, "net");
+ else if (!strcmp(group->cg_item.ci_namebuf, "most_video"))
+ strcpy(mdev_link->comp, "video");
+ strcpy(mdev_link->name, name);
+ return &mdev_link->item;
+}
+
+static void most_common_release(struct config_item *item)
+{
+ struct config_group *group = to_config_group(item);
+
+ kfree(to_most_common(group->cg_subsys));
+}
+
+static struct configfs_item_operations most_common_item_ops = {
+ .release = most_common_release,
+};
+
+static void most_common_disconnect(struct config_group *group,
+ struct config_item *item)
+{
+ struct most_common *mc = to_most_common(group->cg_subsys);
+
+ module_put(mc->mod);
+}
+
+static struct configfs_group_operations most_common_group_ops = {
+ .make_item = most_common_make_item,
+ .disconnect_notify = most_common_disconnect,
+};
+
+static const struct config_item_type most_common_type = {
+ .ct_item_ops = &most_common_item_ops,
+ .ct_group_ops = &most_common_group_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct most_common most_cdev = {
+ .subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "most_cdev",
+ .ci_type = &most_common_type,
+ },
+ },
+ },
+};
+
+static struct most_common most_net = {
+ .subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "most_net",
+ .ci_type = &most_common_type,
+ },
+ },
+ },
+};
+
+static struct most_common most_video = {
+ .subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "most_video",
+ .ci_type = &most_common_type,
+ },
+ },
+ },
+};
+
+struct most_snd_grp {
+ struct config_group group;
+ bool create_card;
+ struct list_head list;
+};
+
+static struct most_snd_grp *to_most_snd_grp(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct most_snd_grp, group);
+}
+
+static struct config_item *most_snd_grp_make_item(struct config_group *group,
+ const char *name)
+{
+ struct mdev_link *mdev_link;
+
+ mdev_link = kzalloc(sizeof(*mdev_link), GFP_KERNEL);
+ if (!mdev_link)
+ return ERR_PTR(-ENOMEM);
+
+ config_item_init_type_name(&mdev_link->item, name, &mdev_link_type);
+ mdev_link->create_link = false;
+ strcpy(mdev_link->name, name);
+ strcpy(mdev_link->comp, "sound");
+ return &mdev_link->item;
+}
+
+static ssize_t most_snd_grp_create_card_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct most_snd_grp *snd_grp = to_most_snd_grp(item);
+ int ret;
+ bool tmp;
+
+ ret = kstrtobool(page, &tmp);
+ if (ret)
+ return ret;
+ if (tmp) {
+ ret = most_cfg_complete("sound");
+ if (ret)
+ return ret;
+ }
+ snd_grp->create_card = tmp;
+ return count;
+}
+
+CONFIGFS_ATTR_WO(most_snd_grp_, create_card);
+
+static struct configfs_attribute *most_snd_grp_attrs[] = {
+ &most_snd_grp_attr_create_card,
+ NULL,
+};
+
+static void most_snd_grp_release(struct config_item *item)
+{
+ struct most_snd_grp *group = to_most_snd_grp(item);
+
+ list_del(&group->list);
+ kfree(group);
+}
+
+static struct configfs_item_operations most_snd_grp_item_ops = {
+ .release = most_snd_grp_release,
+};
+
+static struct configfs_group_operations most_snd_grp_group_ops = {
+ .make_item = most_snd_grp_make_item,
+};
+
+static const struct config_item_type most_snd_grp_type = {
+ .ct_item_ops = &most_snd_grp_item_ops,
+ .ct_group_ops = &most_snd_grp_group_ops,
+ .ct_attrs = most_snd_grp_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+struct most_sound {
+ struct configfs_subsystem subsys;
+ struct list_head soundcard_list;
+ struct module *mod;
+};
+
+static struct config_group *most_sound_make_group(struct config_group *group,
+ const char *name)
+{
+ struct most_snd_grp *most;
+ struct most_sound *ms = container_of(group->cg_subsys,
+ struct most_sound, subsys);
+
+ list_for_each_entry(most, &ms->soundcard_list, list) {
+ if (!most->create_card) {
+ pr_info("adapter configuration still in progress.\n");
+ return ERR_PTR(-EPROTO);
+ }
+ }
+ if (!try_module_get(ms->mod))
+ return ERR_PTR(-ENOLCK);
+ most = kzalloc(sizeof(*most), GFP_KERNEL);
+ if (!most) {
+ module_put(ms->mod);
+ return ERR_PTR(-ENOMEM);
+ }
+ config_group_init_type_name(&most->group, name, &most_snd_grp_type);
+ list_add_tail(&most->list, &ms->soundcard_list);
+ return &most->group;
+}
+
+static void most_sound_disconnect(struct config_group *group,
+ struct config_item *item)
+{
+ struct most_sound *ms = container_of(group->cg_subsys,
+ struct most_sound, subsys);
+ module_put(ms->mod);
+}
+
+static struct configfs_group_operations most_sound_group_ops = {
+ .make_group = most_sound_make_group,
+ .disconnect_notify = most_sound_disconnect,
+};
+
+static const struct config_item_type most_sound_type = {
+ .ct_group_ops = &most_sound_group_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct most_sound most_sound_subsys = {
+ .subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "most_sound",
+ .ci_type = &most_sound_type,
+ },
+ },
+ },
+};
+
+int most_register_configfs_subsys(struct most_component *c)
+{
+ int ret;
+
+ if (!strcmp(c->name, "cdev")) {
+ most_cdev.mod = c->mod;
+ ret = configfs_register_subsystem(&most_cdev.subsys);
+ } else if (!strcmp(c->name, "net")) {
+ most_net.mod = c->mod;
+ ret = configfs_register_subsystem(&most_net.subsys);
+ } else if (!strcmp(c->name, "video")) {
+ most_video.mod = c->mod;
+ ret = configfs_register_subsystem(&most_video.subsys);
+ } else if (!strcmp(c->name, "sound")) {
+ most_sound_subsys.mod = c->mod;
+ ret = configfs_register_subsystem(&most_sound_subsys.subsys);
+ } else {
+ return -ENODEV;
+ }
+
+ if (ret) {
+ pr_err("Error %d while registering subsystem %s\n",
+ ret, c->name);
+ }
+ return ret;
+}
+EXPORT_SYMBOL_GPL(most_register_configfs_subsys);
+
+void most_interface_register_notify(const char *mdev)
+{
+ bool register_snd_card = false;
+ struct mdev_link *mdev_link;
+
+ list_for_each_entry(mdev_link, &mdev_link_list, list) {
+ if (!strcmp(mdev_link->device, mdev)) {
+ set_config_and_add_link(mdev_link);
+ if (!strcmp(mdev_link->comp, "sound"))
+ register_snd_card = true;
+ }
+ }
+ if (register_snd_card)
+ most_cfg_complete("sound");
+}
+
+void most_deregister_configfs_subsys(struct most_component *c)
+{
+ if (!strcmp(c->name, "cdev"))
+ configfs_unregister_subsystem(&most_cdev.subsys);
+ else if (!strcmp(c->name, "net"))
+ configfs_unregister_subsystem(&most_net.subsys);
+ else if (!strcmp(c->name, "video"))
+ configfs_unregister_subsystem(&most_video.subsys);
+ else if (!strcmp(c->name, "sound"))
+ configfs_unregister_subsystem(&most_sound_subsys.subsys);
+}
+EXPORT_SYMBOL_GPL(most_deregister_configfs_subsys);
+
+int __init configfs_init(void)
+{
+ config_group_init(&most_cdev.subsys.su_group);
+ mutex_init(&most_cdev.subsys.su_mutex);
+
+ config_group_init(&most_net.subsys.su_group);
+ mutex_init(&most_net.subsys.su_mutex);
+
+ config_group_init(&most_video.subsys.su_group);
+ mutex_init(&most_video.subsys.su_mutex);
+
+ config_group_init(&most_sound_subsys.subsys.su_group);
+ mutex_init(&most_sound_subsys.subsys.su_mutex);
+
+ INIT_LIST_HEAD(&most_sound_subsys.soundcard_list);
+ INIT_LIST_HEAD(&mdev_link_list);
+
+ return 0;
+}
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * core.c - Implementation of core module of MOST Linux driver stack
+ *
+ * Copyright (C) 2013-2020 Microchip Technology Germany II GmbH & Co. KG
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/poll.h>
+#include <linux/wait.h>
+#include <linux/kobject.h>
+#include <linux/mutex.h>
+#include <linux/completion.h>
+#include <linux/sysfs.h>
+#include <linux/kthread.h>
+#include <linux/dma-mapping.h>
+#include <linux/idr.h>
+#include <linux/most.h>
+
+#define MAX_CHANNELS 64
+#define STRING_SIZE 80
+
+static struct ida mdev_id;
+static int dummy_num_buffers;
+static struct list_head comp_list;
+
+struct pipe {
+ struct most_component *comp;
+ int refs;
+ int num_buffers;
+};
+
+struct most_channel {
+ struct device dev;
+ struct completion cleanup;
+ atomic_t mbo_ref;
+ atomic_t mbo_nq_level;
+ u16 channel_id;
+ char name[STRING_SIZE];
+ bool is_poisoned;
+ struct mutex start_mutex; /* channel activation synchronization */
+ struct mutex nq_mutex; /* nq thread synchronization */
+ int is_starving;
+ struct most_interface *iface;
+ struct most_channel_config cfg;
+ bool keep_mbo;
+ bool enqueue_halt;
+ struct list_head fifo;
+ spinlock_t fifo_lock; /* fifo access synchronization */
+ struct list_head halt_fifo;
+ struct list_head list;
+ struct pipe pipe0;
+ struct pipe pipe1;
+ struct list_head trash_fifo;
+ struct task_struct *hdm_enqueue_task;
+ wait_queue_head_t hdm_fifo_wq;
+
+};
+
+#define to_channel(d) container_of(d, struct most_channel, dev)
+
+struct interface_private {
+ int dev_id;
+ char name[STRING_SIZE];
+ struct most_channel *channel[MAX_CHANNELS];
+ struct list_head channel_list;
+};
+
+static const struct {
+ int most_ch_data_type;
+ const char *name;
+} ch_data_type[] = {
+ { MOST_CH_CONTROL, "control" },
+ { MOST_CH_ASYNC, "async" },
+ { MOST_CH_SYNC, "sync" },
+ { MOST_CH_ISOC, "isoc"},
+ { MOST_CH_ISOC, "isoc_avp"},
+};
+
+/**
+ * list_pop_mbo - retrieves the first MBO of the list and removes it
+ * @ptr: the list head to grab the MBO from.
+ */
+#define list_pop_mbo(ptr) \
+({ \
+ struct mbo *_mbo = list_first_entry(ptr, struct mbo, list); \
+ list_del(&_mbo->list); \
+ _mbo; \
+})
+
+/**
+ * most_free_mbo_coherent - free an MBO and its coherent buffer
+ * @mbo: most buffer
+ */
+static void most_free_mbo_coherent(struct mbo *mbo)
+{
+ struct most_channel *c = mbo->context;
+ u16 const coherent_buf_size = c->cfg.buffer_size + c->cfg.extra_len;
+
+ if (c->iface->dma_free)
+ c->iface->dma_free(mbo, coherent_buf_size);
+ else
+ kfree(mbo->virt_address);
+ kfree(mbo);
+ if (atomic_sub_and_test(1, &c->mbo_ref))
+ complete(&c->cleanup);
+}
+
+/**
+ * flush_channel_fifos - clear the channel fifos
+ * @c: pointer to channel object
+ */
+static void flush_channel_fifos(struct most_channel *c)
+{
+ unsigned long flags, hf_flags;
+ struct mbo *mbo, *tmp;
+
+ if (list_empty(&c->fifo) && list_empty(&c->halt_fifo))
+ return;
+
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ list_for_each_entry_safe(mbo, tmp, &c->fifo, list) {
+ list_del(&mbo->list);
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+ most_free_mbo_coherent(mbo);
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ }
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+
+ spin_lock_irqsave(&c->fifo_lock, hf_flags);
+ list_for_each_entry_safe(mbo, tmp, &c->halt_fifo, list) {
+ list_del(&mbo->list);
+ spin_unlock_irqrestore(&c->fifo_lock, hf_flags);
+ most_free_mbo_coherent(mbo);
+ spin_lock_irqsave(&c->fifo_lock, hf_flags);
+ }
+ spin_unlock_irqrestore(&c->fifo_lock, hf_flags);
+
+ if (unlikely((!list_empty(&c->fifo) || !list_empty(&c->halt_fifo))))
+ dev_warn(&c->dev, "Channel or trash fifo not empty\n");
+}
+
+/**
+ * flush_trash_fifo - clear the trash fifo
+ * @c: pointer to channel object
+ */
+static int flush_trash_fifo(struct most_channel *c)
+{
+ struct mbo *mbo, *tmp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ list_for_each_entry_safe(mbo, tmp, &c->trash_fifo, list) {
+ list_del(&mbo->list);
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+ most_free_mbo_coherent(mbo);
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ }
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+ return 0;
+}
+
+static ssize_t available_directions_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+ unsigned int i = c->channel_id;
+
+ strcpy(buf, "");
+ if (c->iface->channel_vector[i].direction & MOST_CH_RX)
+ strcat(buf, "rx ");
+ if (c->iface->channel_vector[i].direction & MOST_CH_TX)
+ strcat(buf, "tx ");
+ strcat(buf, "\n");
+ return strlen(buf);
+}
+
+static ssize_t available_datatypes_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+ unsigned int i = c->channel_id;
+
+ strcpy(buf, "");
+ if (c->iface->channel_vector[i].data_type & MOST_CH_CONTROL)
+ strcat(buf, "control ");
+ if (c->iface->channel_vector[i].data_type & MOST_CH_ASYNC)
+ strcat(buf, "async ");
+ if (c->iface->channel_vector[i].data_type & MOST_CH_SYNC)
+ strcat(buf, "sync ");
+ if (c->iface->channel_vector[i].data_type & MOST_CH_ISOC)
+ strcat(buf, "isoc ");
+ strcat(buf, "\n");
+ return strlen(buf);
+}
+
+static ssize_t number_of_packet_buffers_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+ unsigned int i = c->channel_id;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n",
+ c->iface->channel_vector[i].num_buffers_packet);
+}
+
+static ssize_t number_of_stream_buffers_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+ unsigned int i = c->channel_id;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n",
+ c->iface->channel_vector[i].num_buffers_streaming);
+}
+
+static ssize_t size_of_packet_buffer_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+ unsigned int i = c->channel_id;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n",
+ c->iface->channel_vector[i].buffer_size_packet);
+}
+
+static ssize_t size_of_stream_buffer_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+ unsigned int i = c->channel_id;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n",
+ c->iface->channel_vector[i].buffer_size_streaming);
+}
+
+static ssize_t channel_starving_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", c->is_starving);
+}
+
+static ssize_t set_number_of_buffers_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.num_buffers);
+}
+
+static ssize_t set_buffer_size_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.buffer_size);
+}
+
+static ssize_t set_direction_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+
+ if (c->cfg.direction & MOST_CH_TX)
+ return snprintf(buf, PAGE_SIZE, "tx\n");
+ else if (c->cfg.direction & MOST_CH_RX)
+ return snprintf(buf, PAGE_SIZE, "rx\n");
+ return snprintf(buf, PAGE_SIZE, "unconfigured\n");
+}
+
+static ssize_t set_datatype_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int i;
+ struct most_channel *c = to_channel(dev);
+
+ for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) {
+ if (c->cfg.data_type & ch_data_type[i].most_ch_data_type)
+ return snprintf(buf, PAGE_SIZE, "%s",
+ ch_data_type[i].name);
+ }
+ return snprintf(buf, PAGE_SIZE, "unconfigured\n");
+}
+
+static ssize_t set_subbuffer_size_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.subbuffer_size);
+}
+
+static ssize_t set_packets_per_xact_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.packets_per_xact);
+}
+
+static ssize_t set_dbr_size_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct most_channel *c = to_channel(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.dbr_size);
+}
+
+#define to_dev_attr(a) container_of(a, struct device_attribute, attr)
+static umode_t channel_attr_is_visible(struct kobject *kobj,
+ struct attribute *attr, int index)
+{
+ struct device_attribute *dev_attr = to_dev_attr(attr);
+ struct device *dev = kobj_to_dev(kobj);
+ struct most_channel *c = to_channel(dev);
+
+ if (!strcmp(dev_attr->attr.name, "set_dbr_size") &&
+ (c->iface->interface != ITYPE_MEDIALB_DIM2))
+ return 0;
+ if (!strcmp(dev_attr->attr.name, "set_packets_per_xact") &&
+ (c->iface->interface != ITYPE_USB))
+ return 0;
+
+ return attr->mode;
+}
+
+#define DEV_ATTR(_name) (&dev_attr_##_name.attr)
+
+static DEVICE_ATTR_RO(available_directions);
+static DEVICE_ATTR_RO(available_datatypes);
+static DEVICE_ATTR_RO(number_of_packet_buffers);
+static DEVICE_ATTR_RO(number_of_stream_buffers);
+static DEVICE_ATTR_RO(size_of_stream_buffer);
+static DEVICE_ATTR_RO(size_of_packet_buffer);
+static DEVICE_ATTR_RO(channel_starving);
+static DEVICE_ATTR_RO(set_buffer_size);
+static DEVICE_ATTR_RO(set_number_of_buffers);
+static DEVICE_ATTR_RO(set_direction);
+static DEVICE_ATTR_RO(set_datatype);
+static DEVICE_ATTR_RO(set_subbuffer_size);
+static DEVICE_ATTR_RO(set_packets_per_xact);
+static DEVICE_ATTR_RO(set_dbr_size);
+
+static struct attribute *channel_attrs[] = {
+ DEV_ATTR(available_directions),
+ DEV_ATTR(available_datatypes),
+ DEV_ATTR(number_of_packet_buffers),
+ DEV_ATTR(number_of_stream_buffers),
+ DEV_ATTR(size_of_stream_buffer),
+ DEV_ATTR(size_of_packet_buffer),
+ DEV_ATTR(channel_starving),
+ DEV_ATTR(set_buffer_size),
+ DEV_ATTR(set_number_of_buffers),
+ DEV_ATTR(set_direction),
+ DEV_ATTR(set_datatype),
+ DEV_ATTR(set_subbuffer_size),
+ DEV_ATTR(set_packets_per_xact),
+ DEV_ATTR(set_dbr_size),
+ NULL,
+};
+
+static struct attribute_group channel_attr_group = {
+ .attrs = channel_attrs,
+ .is_visible = channel_attr_is_visible,
+};
+
+static const struct attribute_group *channel_attr_groups[] = {
+ &channel_attr_group,
+ NULL,
+};
+
+static ssize_t description_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_interface *iface = dev_get_drvdata(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%s\n", iface->description);
+}
+
+static ssize_t interface_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct most_interface *iface = dev_get_drvdata(dev);
+
+ switch (iface->interface) {
+ case ITYPE_LOOPBACK:
+ return snprintf(buf, PAGE_SIZE, "loopback\n");
+ case ITYPE_I2C:
+ return snprintf(buf, PAGE_SIZE, "i2c\n");
+ case ITYPE_I2S:
+ return snprintf(buf, PAGE_SIZE, "i2s\n");
+ case ITYPE_TSI:
+ return snprintf(buf, PAGE_SIZE, "tsi\n");
+ case ITYPE_HBI:
+ return snprintf(buf, PAGE_SIZE, "hbi\n");
+ case ITYPE_MEDIALB_DIM:
+ return snprintf(buf, PAGE_SIZE, "mlb_dim\n");
+ case ITYPE_MEDIALB_DIM2:
+ return snprintf(buf, PAGE_SIZE, "mlb_dim2\n");
+ case ITYPE_USB:
+ return snprintf(buf, PAGE_SIZE, "usb\n");
+ case ITYPE_PCIE:
+ return snprintf(buf, PAGE_SIZE, "pcie\n");
+ }
+ return snprintf(buf, PAGE_SIZE, "unknown\n");
+}
+
+static DEVICE_ATTR_RO(description);
+static DEVICE_ATTR_RO(interface);
+
+static struct attribute *interface_attrs[] = {
+ DEV_ATTR(description),
+ DEV_ATTR(interface),
+ NULL,
+};
+
+static struct attribute_group interface_attr_group = {
+ .attrs = interface_attrs,
+};
+
+static const struct attribute_group *interface_attr_groups[] = {
+ &interface_attr_group,
+ NULL,
+};
+
+static struct most_component *match_component(char *name)
+{
+ struct most_component *comp;
+
+ list_for_each_entry(comp, &comp_list, list) {
+ if (!strcmp(comp->name, name))
+ return comp;
+ }
+ return NULL;
+}
+
+struct show_links_data {
+ int offs;
+ char *buf;
+};
+
+static int print_links(struct device *dev, void *data)
+{
+ struct show_links_data *d = data;
+ int offs = d->offs;
+ char *buf = d->buf;
+ struct most_channel *c;
+ struct most_interface *iface = dev_get_drvdata(dev);
+
+ list_for_each_entry(c, &iface->p->channel_list, list) {
+ if (c->pipe0.comp) {
+ offs += scnprintf(buf + offs,
+ PAGE_SIZE - offs,
+ "%s:%s:%s\n",
+ c->pipe0.comp->name,
+ dev_name(iface->dev),
+ dev_name(&c->dev));
+ }
+ if (c->pipe1.comp) {
+ offs += scnprintf(buf + offs,
+ PAGE_SIZE - offs,
+ "%s:%s:%s\n",
+ c->pipe1.comp->name,
+ dev_name(iface->dev),
+ dev_name(&c->dev));
+ }
+ }
+ d->offs = offs;
+ return 0;
+}
+
+static int most_match(struct device *dev, struct device_driver *drv)
+{
+ if (!strcmp(dev_name(dev), "most"))
+ return 0;
+ else
+ return 1;
+}
+
+static struct bus_type mostbus = {
+ .name = "most",
+ .match = most_match,
+};
+
+static ssize_t links_show(struct device_driver *drv, char *buf)
+{
+ struct show_links_data d = { .buf = buf };
+
+ bus_for_each_dev(&mostbus, NULL, &d, print_links);
+ return d.offs;
+}
+
+static ssize_t components_show(struct device_driver *drv, char *buf)
+{
+ struct most_component *comp;
+ int offs = 0;
+
+ list_for_each_entry(comp, &comp_list, list) {
+ offs += scnprintf(buf + offs, PAGE_SIZE - offs, "%s\n",
+ comp->name);
+ }
+ return offs;
+}
+
+/**
+ * get_channel - get pointer to channel
+ * @mdev: name of the device interface
+ * @mdev_ch: name of channel
+ */
+static struct most_channel *get_channel(char *mdev, char *mdev_ch)
+{
+ struct device *dev = NULL;
+ struct most_interface *iface;
+ struct most_channel *c, *tmp;
+
+ dev = bus_find_device_by_name(&mostbus, NULL, mdev);
+ if (!dev)
+ return NULL;
+ put_device(dev);
+ iface = dev_get_drvdata(dev);
+ list_for_each_entry_safe(c, tmp, &iface->p->channel_list, list) {
+ if (!strcmp(dev_name(&c->dev), mdev_ch))
+ return c;
+ }
+ return NULL;
+}
+
+static
+inline int link_channel_to_component(struct most_channel *c,
+ struct most_component *comp,
+ char *name,
+ char *comp_param)
+{
+ int ret;
+ struct most_component **comp_ptr;
+
+ if (!c->pipe0.comp)
+ comp_ptr = &c->pipe0.comp;
+ else if (!c->pipe1.comp)
+ comp_ptr = &c->pipe1.comp;
+ else
+ return -ENOSPC;
+
+ *comp_ptr = comp;
+ ret = comp->probe_channel(c->iface, c->channel_id, &c->cfg, name,
+ comp_param);
+ if (ret) {
+ *comp_ptr = NULL;
+ return ret;
+ }
+ return 0;
+}
+
+int most_set_cfg_buffer_size(char *mdev, char *mdev_ch, u16 val)
+{
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+
+ if (!c)
+ return -ENODEV;
+ c->cfg.buffer_size = val;
+ return 0;
+}
+
+int most_set_cfg_subbuffer_size(char *mdev, char *mdev_ch, u16 val)
+{
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+
+ if (!c)
+ return -ENODEV;
+ c->cfg.subbuffer_size = val;
+ return 0;
+}
+
+int most_set_cfg_dbr_size(char *mdev, char *mdev_ch, u16 val)
+{
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+
+ if (!c)
+ return -ENODEV;
+ c->cfg.dbr_size = val;
+ return 0;
+}
+
+int most_set_cfg_num_buffers(char *mdev, char *mdev_ch, u16 val)
+{
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+
+ if (!c)
+ return -ENODEV;
+ c->cfg.num_buffers = val;
+ return 0;
+}
+
+int most_set_cfg_datatype(char *mdev, char *mdev_ch, char *buf)
+{
+ int i;
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+
+ if (!c)
+ return -ENODEV;
+ for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) {
+ if (!strcmp(buf, ch_data_type[i].name)) {
+ c->cfg.data_type = ch_data_type[i].most_ch_data_type;
+ break;
+ }
+ }
+
+ if (i == ARRAY_SIZE(ch_data_type))
+ dev_warn(&c->dev, "Invalid attribute settings\n");
+ return 0;
+}
+
+int most_set_cfg_direction(char *mdev, char *mdev_ch, char *buf)
+{
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+
+ if (!c)
+ return -ENODEV;
+ if (!strcmp(buf, "dir_rx")) {
+ c->cfg.direction = MOST_CH_RX;
+ } else if (!strcmp(buf, "rx")) {
+ c->cfg.direction = MOST_CH_RX;
+ } else if (!strcmp(buf, "dir_tx")) {
+ c->cfg.direction = MOST_CH_TX;
+ } else if (!strcmp(buf, "tx")) {
+ c->cfg.direction = MOST_CH_TX;
+ } else {
+ dev_err(&c->dev, "Invalid direction\n");
+ return -ENODATA;
+ }
+ return 0;
+}
+
+int most_set_cfg_packets_xact(char *mdev, char *mdev_ch, u16 val)
+{
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+
+ if (!c)
+ return -ENODEV;
+ c->cfg.packets_per_xact = val;
+ return 0;
+}
+
+int most_cfg_complete(char *comp_name)
+{
+ struct most_component *comp;
+
+ comp = match_component(comp_name);
+ if (!comp)
+ return -ENODEV;
+
+ return comp->cfg_complete();
+}
+
+int most_add_link(char *mdev, char *mdev_ch, char *comp_name, char *link_name,
+ char *comp_param)
+{
+ struct most_channel *c = get_channel(mdev, mdev_ch);
+ struct most_component *comp = match_component(comp_name);
+
+ if (!c || !comp)
+ return -ENODEV;
+
+ return link_channel_to_component(c, comp, link_name, comp_param);
+}
+
+int most_remove_link(char *mdev, char *mdev_ch, char *comp_name)
+{
+ struct most_channel *c;
+ struct most_component *comp;
+
+ comp = match_component(comp_name);
+ if (!comp)
+ return -ENODEV;
+ c = get_channel(mdev, mdev_ch);
+ if (!c)
+ return -ENODEV;
+
+ if (comp->disconnect_channel(c->iface, c->channel_id))
+ return -EIO;
+ if (c->pipe0.comp == comp)
+ c->pipe0.comp = NULL;
+ if (c->pipe1.comp == comp)
+ c->pipe1.comp = NULL;
+ return 0;
+}
+
+#define DRV_ATTR(_name) (&driver_attr_##_name.attr)
+
+static DRIVER_ATTR_RO(links);
+static DRIVER_ATTR_RO(components);
+
+static struct attribute *mc_attrs[] = {
+ DRV_ATTR(links),
+ DRV_ATTR(components),
+ NULL,
+};
+
+static struct attribute_group mc_attr_group = {
+ .attrs = mc_attrs,
+};
+
+static const struct attribute_group *mc_attr_groups[] = {
+ &mc_attr_group,
+ NULL,
+};
+
+static struct device_driver mostbus_driver = {
+ .name = "most_core",
+ .bus = &mostbus,
+ .groups = mc_attr_groups,
+};
+
+static inline void trash_mbo(struct mbo *mbo)
+{
+ unsigned long flags;
+ struct most_channel *c = mbo->context;
+
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ list_add(&mbo->list, &c->trash_fifo);
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+}
+
+static bool hdm_mbo_ready(struct most_channel *c)
+{
+ bool empty;
+
+ if (c->enqueue_halt)
+ return false;
+
+ spin_lock_irq(&c->fifo_lock);
+ empty = list_empty(&c->halt_fifo);
+ spin_unlock_irq(&c->fifo_lock);
+
+ return !empty;
+}
+
+static void nq_hdm_mbo(struct mbo *mbo)
+{
+ unsigned long flags;
+ struct most_channel *c = mbo->context;
+
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ list_add_tail(&mbo->list, &c->halt_fifo);
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+ wake_up_interruptible(&c->hdm_fifo_wq);
+}
+
+static int hdm_enqueue_thread(void *data)
+{
+ struct most_channel *c = data;
+ struct mbo *mbo;
+ int ret;
+ typeof(c->iface->enqueue) enqueue = c->iface->enqueue;
+
+ while (likely(!kthread_should_stop())) {
+ wait_event_interruptible(c->hdm_fifo_wq,
+ hdm_mbo_ready(c) ||
+ kthread_should_stop());
+
+ mutex_lock(&c->nq_mutex);
+ spin_lock_irq(&c->fifo_lock);
+ if (unlikely(c->enqueue_halt || list_empty(&c->halt_fifo))) {
+ spin_unlock_irq(&c->fifo_lock);
+ mutex_unlock(&c->nq_mutex);
+ continue;
+ }
+
+ mbo = list_pop_mbo(&c->halt_fifo);
+ spin_unlock_irq(&c->fifo_lock);
+
+ if (c->cfg.direction == MOST_CH_RX)
+ mbo->buffer_length = c->cfg.buffer_size;
+
+ ret = enqueue(mbo->ifp, mbo->hdm_channel_id, mbo);
+ mutex_unlock(&c->nq_mutex);
+
+ if (unlikely(ret)) {
+ dev_err(&c->dev, "Buffer enqueue failed\n");
+ nq_hdm_mbo(mbo);
+ c->hdm_enqueue_task = NULL;
+ return 0;
+ }
+ }
+
+ return 0;
+}
+
+static int run_enqueue_thread(struct most_channel *c, int channel_id)
+{
+ struct task_struct *task =
+ kthread_run(hdm_enqueue_thread, c, "hdm_fifo_%d",
+ channel_id);
+
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+
+ c->hdm_enqueue_task = task;
+ return 0;
+}
+
+/**
+ * arm_mbo - recycle MBO for further usage
+ * @mbo: most buffer
+ *
+ * This puts an MBO back to the list to have it ready for up coming
+ * tx transactions.
+ *
+ * In case the MBO belongs to a channel that recently has been
+ * poisoned, the MBO is scheduled to be trashed.
+ * Calls the completion handler of an attached component.
+ */
+static void arm_mbo(struct mbo *mbo)
+{
+ unsigned long flags;
+ struct most_channel *c;
+
+ c = mbo->context;
+
+ if (c->is_poisoned) {
+ trash_mbo(mbo);
+ return;
+ }
+
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ ++*mbo->num_buffers_ptr;
+ list_add_tail(&mbo->list, &c->fifo);
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+
+ if (c->pipe0.refs && c->pipe0.comp->tx_completion)
+ c->pipe0.comp->tx_completion(c->iface, c->channel_id);
+
+ if (c->pipe1.refs && c->pipe1.comp->tx_completion)
+ c->pipe1.comp->tx_completion(c->iface, c->channel_id);
+}
+
+/**
+ * arm_mbo_chain - helper function that arms an MBO chain for the HDM
+ * @c: pointer to interface channel
+ * @dir: direction of the channel
+ * @compl: pointer to completion function
+ *
+ * This allocates buffer objects including the containing DMA coherent
+ * buffer and puts them in the fifo.
+ * Buffers of Rx channels are put in the kthread fifo, hence immediately
+ * submitted to the HDM.
+ *
+ * Returns the number of allocated and enqueued MBOs.
+ */
+static int arm_mbo_chain(struct most_channel *c, int dir,
+ void (*compl)(struct mbo *))
+{
+ unsigned int i;
+ struct mbo *mbo;
+ unsigned long flags;
+ u32 coherent_buf_size = c->cfg.buffer_size + c->cfg.extra_len;
+
+ atomic_set(&c->mbo_nq_level, 0);
+
+ for (i = 0; i < c->cfg.num_buffers; i++) {
+ mbo = kzalloc(sizeof(*mbo), GFP_KERNEL);
+ if (!mbo)
+ goto flush_fifos;
+
+ mbo->context = c;
+ mbo->ifp = c->iface;
+ mbo->hdm_channel_id = c->channel_id;
+ if (c->iface->dma_alloc) {
+ mbo->virt_address =
+ c->iface->dma_alloc(mbo, coherent_buf_size);
+ } else {
+ mbo->virt_address =
+ kzalloc(coherent_buf_size, GFP_KERNEL);
+ }
+ if (!mbo->virt_address)
+ goto release_mbo;
+
+ mbo->complete = compl;
+ mbo->num_buffers_ptr = &dummy_num_buffers;
+ if (dir == MOST_CH_RX) {
+ nq_hdm_mbo(mbo);
+ atomic_inc(&c->mbo_nq_level);
+ } else {
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ list_add_tail(&mbo->list, &c->fifo);
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+ }
+ }
+ return c->cfg.num_buffers;
+
+release_mbo:
+ kfree(mbo);
+
+flush_fifos:
+ flush_channel_fifos(c);
+ return 0;
+}
+
+/**
+ * most_submit_mbo - submits an MBO to fifo
+ * @mbo: most buffer
+ */
+void most_submit_mbo(struct mbo *mbo)
+{
+ if (WARN_ONCE(!mbo || !mbo->context,
+ "Bad buffer or missing channel reference\n"))
+ return;
+
+ nq_hdm_mbo(mbo);
+}
+EXPORT_SYMBOL_GPL(most_submit_mbo);
+
+/**
+ * most_write_completion - write completion handler
+ * @mbo: most buffer
+ *
+ * This recycles the MBO for further usage. In case the channel has been
+ * poisoned, the MBO is scheduled to be trashed.
+ */
+static void most_write_completion(struct mbo *mbo)
+{
+ struct most_channel *c;
+
+ c = mbo->context;
+ if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE)))
+ trash_mbo(mbo);
+ else
+ arm_mbo(mbo);
+}
+
+int channel_has_mbo(struct most_interface *iface, int id,
+ struct most_component *comp)
+{
+ struct most_channel *c = iface->p->channel[id];
+ unsigned long flags;
+ int empty;
+
+ if (unlikely(!c))
+ return -EINVAL;
+
+ if (c->pipe0.refs && c->pipe1.refs &&
+ ((comp == c->pipe0.comp && c->pipe0.num_buffers <= 0) ||
+ (comp == c->pipe1.comp && c->pipe1.num_buffers <= 0)))
+ return 0;
+
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ empty = list_empty(&c->fifo);
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+ return !empty;
+}
+EXPORT_SYMBOL_GPL(channel_has_mbo);
+
+/**
+ * most_get_mbo - get pointer to an MBO of pool
+ * @iface: pointer to interface instance
+ * @id: channel ID
+ * @comp: driver component
+ *
+ * This attempts to get a free buffer out of the channel fifo.
+ * Returns a pointer to MBO on success or NULL otherwise.
+ */
+struct mbo *most_get_mbo(struct most_interface *iface, int id,
+ struct most_component *comp)
+{
+ struct mbo *mbo;
+ struct most_channel *c;
+ unsigned long flags;
+ int *num_buffers_ptr;
+
+ c = iface->p->channel[id];
+ if (unlikely(!c))
+ return NULL;
+
+ if (c->pipe0.refs && c->pipe1.refs &&
+ ((comp == c->pipe0.comp && c->pipe0.num_buffers <= 0) ||
+ (comp == c->pipe1.comp && c->pipe1.num_buffers <= 0)))
+ return NULL;
+
+ if (comp == c->pipe0.comp)
+ num_buffers_ptr = &c->pipe0.num_buffers;
+ else if (comp == c->pipe1.comp)
+ num_buffers_ptr = &c->pipe1.num_buffers;
+ else
+ num_buffers_ptr = &dummy_num_buffers;
+
+ spin_lock_irqsave(&c->fifo_lock, flags);
+ if (list_empty(&c->fifo)) {
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+ return NULL;
+ }
+ mbo = list_pop_mbo(&c->fifo);
+ --*num_buffers_ptr;
+ spin_unlock_irqrestore(&c->fifo_lock, flags);
+
+ mbo->num_buffers_ptr = num_buffers_ptr;
+ mbo->buffer_length = c->cfg.buffer_size;
+ return mbo;
+}
+EXPORT_SYMBOL_GPL(most_get_mbo);
+
+/**
+ * most_put_mbo - return buffer to pool
+ * @mbo: most buffer
+ */
+void most_put_mbo(struct mbo *mbo)
+{
+ struct most_channel *c = mbo->context;
+
+ if (c->cfg.direction == MOST_CH_TX) {
+ arm_mbo(mbo);
+ return;
+ }
+ nq_hdm_mbo(mbo);
+ atomic_inc(&c->mbo_nq_level);
+}
+EXPORT_SYMBOL_GPL(most_put_mbo);
+
+/**
+ * most_read_completion - read completion handler
+ * @mbo: most buffer
+ *
+ * This function is called by the HDM when data has been received from the
+ * hardware and copied to the buffer of the MBO.
+ *
+ * In case the channel has been poisoned it puts the buffer in the trash queue.
+ * Otherwise, it passes the buffer to an component for further processing.
+ */
+static void most_read_completion(struct mbo *mbo)
+{
+ struct most_channel *c = mbo->context;
+
+ if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE))) {
+ trash_mbo(mbo);
+ return;
+ }
+
+ if (mbo->status == MBO_E_INVAL) {
+ nq_hdm_mbo(mbo);
+ atomic_inc(&c->mbo_nq_level);
+ return;
+ }
+
+ if (atomic_sub_and_test(1, &c->mbo_nq_level))
+ c->is_starving = 1;
+
+ if (c->pipe0.refs && c->pipe0.comp->rx_completion &&
+ c->pipe0.comp->rx_completion(mbo) == 0)
+ return;
+
+ if (c->pipe1.refs && c->pipe1.comp->rx_completion &&
+ c->pipe1.comp->rx_completion(mbo) == 0)
+ return;
+
+ most_put_mbo(mbo);
+}
+
+/**
+ * most_start_channel - prepares a channel for communication
+ * @iface: pointer to interface instance
+ * @id: channel ID
+ * @comp: driver component
+ *
+ * This prepares the channel for usage. Cross-checks whether the
+ * channel's been properly configured.
+ *
+ * Returns 0 on success or error code otherwise.
+ */
+int most_start_channel(struct most_interface *iface, int id,
+ struct most_component *comp)
+{
+ int num_buffer;
+ int ret;
+ struct most_channel *c = iface->p->channel[id];
+
+ if (unlikely(!c))
+ return -EINVAL;
+
+ mutex_lock(&c->start_mutex);
+ if (c->pipe0.refs + c->pipe1.refs > 0)
+ goto out; /* already started by another component */
+
+ if (!try_module_get(iface->mod)) {
+ dev_err(&c->dev, "Failed to acquire HDM lock\n");
+ mutex_unlock(&c->start_mutex);
+ return -ENOLCK;
+ }
+
+ c->cfg.extra_len = 0;
+ if (c->iface->configure(c->iface, c->channel_id, &c->cfg)) {
+ dev_err(&c->dev, "Channel configuration failed. Go check settings...\n");
+ ret = -EINVAL;
+ goto err_put_module;
+ }
+
+ init_waitqueue_head(&c->hdm_fifo_wq);
+
+ if (c->cfg.direction == MOST_CH_RX)
+ num_buffer = arm_mbo_chain(c, c->cfg.direction,
+ most_read_completion);
+ else
+ num_buffer = arm_mbo_chain(c, c->cfg.direction,
+ most_write_completion);
+ if (unlikely(!num_buffer)) {
+ ret = -ENOMEM;
+ goto err_put_module;
+ }
+
+ ret = run_enqueue_thread(c, id);
+ if (ret)
+ goto err_put_module;
+
+ c->is_starving = 0;
+ c->pipe0.num_buffers = c->cfg.num_buffers / 2;
+ c->pipe1.num_buffers = c->cfg.num_buffers - c->pipe0.num_buffers;
+ atomic_set(&c->mbo_ref, num_buffer);
+
+out:
+ if (comp == c->pipe0.comp)
+ c->pipe0.refs++;
+ if (comp == c->pipe1.comp)
+ c->pipe1.refs++;
+ mutex_unlock(&c->start_mutex);
+ return 0;
+
+err_put_module:
+ module_put(iface->mod);
+ mutex_unlock(&c->start_mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(most_start_channel);
+
+/**
+ * most_stop_channel - stops a running channel
+ * @iface: pointer to interface instance
+ * @id: channel ID
+ * @comp: driver component
+ */
+int most_stop_channel(struct most_interface *iface, int id,
+ struct most_component *comp)
+{
+ struct most_channel *c;
+
+ if (unlikely((!iface) || (id >= iface->num_channels) || (id < 0))) {
+ pr_err("Bad interface or index out of range\n");
+ return -EINVAL;
+ }
+ c = iface->p->channel[id];
+ if (unlikely(!c))
+ return -EINVAL;
+
+ mutex_lock(&c->start_mutex);
+ if (c->pipe0.refs + c->pipe1.refs >= 2)
+ goto out;
+
+ if (c->hdm_enqueue_task)
+ kthread_stop(c->hdm_enqueue_task);
+ c->hdm_enqueue_task = NULL;
+
+ if (iface->mod)
+ module_put(iface->mod);
+
+ c->is_poisoned = true;
+ if (c->iface->poison_channel(c->iface, c->channel_id)) {
+ dev_err(&c->dev, "Failed to stop channel %d of interface %s\n", c->channel_id,
+ c->iface->description);
+ mutex_unlock(&c->start_mutex);
+ return -EAGAIN;
+ }
+ flush_trash_fifo(c);
+ flush_channel_fifos(c);
+
+#ifdef CMPL_INTERRUPTIBLE
+ if (wait_for_completion_interruptible(&c->cleanup)) {
+ dev_err(&c->dev, "Interrupted while cleaning up channel %d\n", c->channel_id);
+ mutex_unlock(&c->start_mutex);
+ return -EINTR;
+ }
+#else
+ wait_for_completion(&c->cleanup);
+#endif
+ c->is_poisoned = false;
+
+out:
+ if (comp == c->pipe0.comp)
+ c->pipe0.refs--;
+ if (comp == c->pipe1.comp)
+ c->pipe1.refs--;
+ mutex_unlock(&c->start_mutex);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(most_stop_channel);
+
+/**
+ * most_register_component - registers a driver component with the core
+ * @comp: driver component
+ */
+int most_register_component(struct most_component *comp)
+{
+ if (!comp) {
+ pr_err("Bad component\n");
+ return -EINVAL;
+ }
+ list_add_tail(&comp->list, &comp_list);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(most_register_component);
+
+static int disconnect_channels(struct device *dev, void *data)
+{
+ struct most_interface *iface;
+ struct most_channel *c, *tmp;
+ struct most_component *comp = data;
+
+ iface = dev_get_drvdata(dev);
+ list_for_each_entry_safe(c, tmp, &iface->p->channel_list, list) {
+ if (c->pipe0.comp == comp || c->pipe1.comp == comp)
+ comp->disconnect_channel(c->iface, c->channel_id);
+ if (c->pipe0.comp == comp)
+ c->pipe0.comp = NULL;
+ if (c->pipe1.comp == comp)
+ c->pipe1.comp = NULL;
+ }
+ return 0;
+}
+
+/**
+ * most_deregister_component - deregisters a driver component with the core
+ * @comp: driver component
+ */
+int most_deregister_component(struct most_component *comp)
+{
+ if (!comp) {
+ pr_err("Bad component\n");
+ return -EINVAL;
+ }
+
+ bus_for_each_dev(&mostbus, NULL, comp, disconnect_channels);
+ list_del(&comp->list);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(most_deregister_component);
+
+static void release_channel(struct device *dev)
+{
+ struct most_channel *c = to_channel(dev);
+
+ kfree(c);
+}
+
+/**
+ * most_register_interface - registers an interface with core
+ * @iface: device interface
+ *
+ * Allocates and initializes a new interface instance and all of its channels.
+ * Returns a pointer to kobject or an error pointer.
+ */
+int most_register_interface(struct most_interface *iface)
+{
+ unsigned int i;
+ int id;
+ struct most_channel *c;
+
+ if (!iface || !iface->enqueue || !iface->configure ||
+ !iface->poison_channel || (iface->num_channels > MAX_CHANNELS)) {
+ dev_err(iface->dev, "Bad interface or channel overflow\n");
+ return -EINVAL;
+ }
+
+ id = ida_simple_get(&mdev_id, 0, 0, GFP_KERNEL);
+ if (id < 0) {
+ dev_err(iface->dev, "Failed to allocate device ID\n");
+ return id;
+ }
+
+ iface->p = kzalloc(sizeof(*iface->p), GFP_KERNEL);
+ if (!iface->p) {
+ ida_simple_remove(&mdev_id, id);
+ return -ENOMEM;
+ }
+
+ INIT_LIST_HEAD(&iface->p->channel_list);
+ iface->p->dev_id = id;
+ strscpy(iface->p->name, iface->description, sizeof(iface->p->name));
+ iface->dev->bus = &mostbus;
+ iface->dev->groups = interface_attr_groups;
+ dev_set_drvdata(iface->dev, iface);
+ if (device_register(iface->dev)) {
+ dev_err(iface->dev, "Failed to register interface device\n");
+ kfree(iface->p);
+ put_device(iface->dev);
+ ida_simple_remove(&mdev_id, id);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < iface->num_channels; i++) {
+ const char *name_suffix = iface->channel_vector[i].name_suffix;
+
+ c = kzalloc(sizeof(*c), GFP_KERNEL);
+ if (!c)
+ goto err_free_resources;
+ if (!name_suffix)
+ snprintf(c->name, STRING_SIZE, "ch%d", i);
+ else
+ snprintf(c->name, STRING_SIZE, "%s", name_suffix);
+ c->dev.init_name = c->name;
+ c->dev.parent = iface->dev;
+ c->dev.groups = channel_attr_groups;
+ c->dev.release = release_channel;
+ iface->p->channel[i] = c;
+ c->is_starving = 0;
+ c->iface = iface;
+ c->channel_id = i;
+ c->keep_mbo = false;
+ c->enqueue_halt = false;
+ c->is_poisoned = false;
+ c->cfg.direction = 0;
+ c->cfg.data_type = 0;
+ c->cfg.num_buffers = 0;
+ c->cfg.buffer_size = 0;
+ c->cfg.subbuffer_size = 0;
+ c->cfg.packets_per_xact = 0;
+ spin_lock_init(&c->fifo_lock);
+ INIT_LIST_HEAD(&c->fifo);
+ INIT_LIST_HEAD(&c->trash_fifo);
+ INIT_LIST_HEAD(&c->halt_fifo);
+ init_completion(&c->cleanup);
+ atomic_set(&c->mbo_ref, 0);
+ mutex_init(&c->start_mutex);
+ mutex_init(&c->nq_mutex);
+ list_add_tail(&c->list, &iface->p->channel_list);
+ if (device_register(&c->dev)) {
+ dev_err(&c->dev, "Failed to register channel device\n");
+ goto err_free_most_channel;
+ }
+ }
+ most_interface_register_notify(iface->description);
+ return 0;
+
+err_free_most_channel:
+ put_device(&c->dev);
+
+err_free_resources:
+ while (i > 0) {
+ c = iface->p->channel[--i];
+ device_unregister(&c->dev);
+ }
+ kfree(iface->p);
+ device_unregister(iface->dev);
+ ida_simple_remove(&mdev_id, id);
+ return -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(most_register_interface);
+
+/**
+ * most_deregister_interface - deregisters an interface with core
+ * @iface: device interface
+ *
+ * Before removing an interface instance from the list, all running
+ * channels are stopped and poisoned.
+ */
+void most_deregister_interface(struct most_interface *iface)
+{
+ int i;
+ struct most_channel *c;
+
+ for (i = 0; i < iface->num_channels; i++) {
+ c = iface->p->channel[i];
+ if (c->pipe0.comp)
+ c->pipe0.comp->disconnect_channel(c->iface,
+ c->channel_id);
+ if (c->pipe1.comp)
+ c->pipe1.comp->disconnect_channel(c->iface,
+ c->channel_id);
+ c->pipe0.comp = NULL;
+ c->pipe1.comp = NULL;
+ list_del(&c->list);
+ device_unregister(&c->dev);
+ }
+
+ ida_simple_remove(&mdev_id, iface->p->dev_id);
+ kfree(iface->p);
+ device_unregister(iface->dev);
+}
+EXPORT_SYMBOL_GPL(most_deregister_interface);
+
+/**
+ * most_stop_enqueue - prevents core from enqueueing MBOs
+ * @iface: pointer to interface
+ * @id: channel id
+ *
+ * This is called by an HDM that _cannot_ attend to its duties and
+ * is imminent to get run over by the core. The core is not going to
+ * enqueue any further packets unless the flagging HDM calls
+ * most_resume enqueue().
+ */
+void most_stop_enqueue(struct most_interface *iface, int id)
+{
+ struct most_channel *c = iface->p->channel[id];
+
+ if (!c)
+ return;
+
+ mutex_lock(&c->nq_mutex);
+ c->enqueue_halt = true;
+ mutex_unlock(&c->nq_mutex);
+}
+EXPORT_SYMBOL_GPL(most_stop_enqueue);
+
+/**
+ * most_resume_enqueue - allow core to enqueue MBOs again
+ * @iface: pointer to interface
+ * @id: channel id
+ *
+ * This clears the enqueue halt flag and enqueues all MBOs currently
+ * sitting in the wait fifo.
+ */
+void most_resume_enqueue(struct most_interface *iface, int id)
+{
+ struct most_channel *c = iface->p->channel[id];
+
+ if (!c)
+ return;
+
+ mutex_lock(&c->nq_mutex);
+ c->enqueue_halt = false;
+ mutex_unlock(&c->nq_mutex);
+
+ wake_up_interruptible(&c->hdm_fifo_wq);
+}
+EXPORT_SYMBOL_GPL(most_resume_enqueue);
+
+static int __init most_init(void)
+{
+ int err;
+
+ INIT_LIST_HEAD(&comp_list);
+ ida_init(&mdev_id);
+
+ err = bus_register(&mostbus);
+ if (err) {
+ pr_err("Failed to register most bus\n");
+ return err;
+ }
+ err = driver_register(&mostbus_driver);
+ if (err) {
+ pr_err("Failed to register core driver\n");
+ goto err_unregister_bus;
+ }
+ configfs_init();
+ return 0;
+
+err_unregister_bus:
+ bus_unregister(&mostbus);
+ return err;
+}
+
+static void __exit most_exit(void)
+{
+ driver_unregister(&mostbus_driver);
+ bus_unregister(&mostbus);
+ ida_destroy(&mdev_id);
+}
+
+module_init(most_init);
+module_exit(most_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
+MODULE_DESCRIPTION("Core module of stacked MOST Linux driver");
# SPDX-License-Identifier: GPL-2.0
-menuconfig MOST
+menuconfig MOST_COMPONENTS
tristate "MOST support"
- depends on HAS_DMA && CONFIGFS_FS
+ depends on HAS_DMA && CONFIGFS_FS && MOST
default n
help
Say Y here if you want to enable MOST support.
-if MOST
+if MOST_COMPONENTS
source "drivers/staging/most/cdev/Kconfig"
# SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_MOST) += most_core.o
-most_core-y := core.o
-most_core-y += configfs.o
obj-$(CONFIG_MOST_CDEV) += cdev/
obj-$(CONFIG_MOST_NET) += net/
#include <linux/kfifo.h>
#include <linux/uaccess.h>
#include <linux/idr.h>
-
-#include "../most.h"
+#include <linux/most.h>
#define CHRDEV_REGION_SIZE 50
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * configfs.c - Implementation of configfs interface to the driver stack
- *
- * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/configfs.h>
-
-#include "most.h"
-
-#define MAX_STRING_SIZE 80
-
-struct mdev_link {
- struct config_item item;
- struct list_head list;
- bool create_link;
- bool destroy_link;
- u16 num_buffers;
- u16 buffer_size;
- u16 subbuffer_size;
- u16 packets_per_xact;
- u16 dbr_size;
- char datatype[MAX_STRING_SIZE];
- char direction[MAX_STRING_SIZE];
- char name[MAX_STRING_SIZE];
- char device[MAX_STRING_SIZE];
- char channel[MAX_STRING_SIZE];
- char comp[MAX_STRING_SIZE];
- char comp_params[MAX_STRING_SIZE];
-};
-
-static struct list_head mdev_link_list;
-
-static int set_cfg_buffer_size(struct mdev_link *link)
-{
- return most_set_cfg_buffer_size(link->device, link->channel,
- link->buffer_size);
-}
-
-static int set_cfg_subbuffer_size(struct mdev_link *link)
-{
- return most_set_cfg_subbuffer_size(link->device, link->channel,
- link->subbuffer_size);
-}
-
-static int set_cfg_dbr_size(struct mdev_link *link)
-{
- return most_set_cfg_dbr_size(link->device, link->channel,
- link->dbr_size);
-}
-
-static int set_cfg_num_buffers(struct mdev_link *link)
-{
- return most_set_cfg_num_buffers(link->device, link->channel,
- link->num_buffers);
-}
-
-static int set_cfg_packets_xact(struct mdev_link *link)
-{
- return most_set_cfg_packets_xact(link->device, link->channel,
- link->packets_per_xact);
-}
-
-static int set_cfg_direction(struct mdev_link *link)
-{
- return most_set_cfg_direction(link->device, link->channel,
- link->direction);
-}
-
-static int set_cfg_datatype(struct mdev_link *link)
-{
- return most_set_cfg_datatype(link->device, link->channel,
- link->datatype);
-}
-
-static int (*set_config_val[])(struct mdev_link *link) = {
- set_cfg_buffer_size,
- set_cfg_subbuffer_size,
- set_cfg_dbr_size,
- set_cfg_num_buffers,
- set_cfg_packets_xact,
- set_cfg_direction,
- set_cfg_datatype,
-};
-
-static struct mdev_link *to_mdev_link(struct config_item *item)
-{
- return container_of(item, struct mdev_link, item);
-}
-
-static int set_config_and_add_link(struct mdev_link *mdev_link)
-{
- int i;
- int ret;
-
- for (i = 0; i < ARRAY_SIZE(set_config_val); i++) {
- ret = set_config_val[i](mdev_link);
- if (ret < 0 && ret != -ENODEV) {
- pr_err("Config failed\n");
- return ret;
- }
- }
-
- return most_add_link(mdev_link->device, mdev_link->channel,
- mdev_link->comp, mdev_link->name,
- mdev_link->comp_params);
-}
-
-static ssize_t mdev_link_create_link_store(struct config_item *item,
- const char *page, size_t count)
-{
- struct mdev_link *mdev_link = to_mdev_link(item);
- bool tmp;
- int ret;
-
- ret = kstrtobool(page, &tmp);
- if (ret)
- return ret;
- if (!tmp)
- return count;
- ret = set_config_and_add_link(mdev_link);
- if (ret && ret != -ENODEV)
- return ret;
- list_add_tail(&mdev_link->list, &mdev_link_list);
- mdev_link->create_link = tmp;
- mdev_link->destroy_link = false;
-
- return count;
-}
-
-static ssize_t mdev_link_destroy_link_store(struct config_item *item,
- const char *page, size_t count)
-{
- struct mdev_link *mdev_link = to_mdev_link(item);
- bool tmp;
- int ret;
-
- ret = kstrtobool(page, &tmp);
- if (ret)
- return ret;
- if (!tmp)
- return count;
-
- ret = most_remove_link(mdev_link->device, mdev_link->channel,
- mdev_link->comp);
- if (ret)
- return ret;
- if (!list_empty(&mdev_link_list))
- list_del(&mdev_link->list);
-
- mdev_link->destroy_link = tmp;
-
- return count;
-}
-
-static ssize_t mdev_link_direction_show(struct config_item *item, char *page)
-{
- return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->direction);
-}
-
-static ssize_t mdev_link_direction_store(struct config_item *item,
- const char *page, size_t count)
-{
- struct mdev_link *mdev_link = to_mdev_link(item);
-
- if (!sysfs_streq(page, "dir_rx") && !sysfs_streq(page, "rx") &&
- !sysfs_streq(page, "dir_tx") && !sysfs_streq(page, "tx"))
- return -EINVAL;
- strcpy(mdev_link->direction, page);
- strim(mdev_link->direction);
- return count;
-}
-
-static ssize_t mdev_link_datatype_show(struct config_item *item, char *page)
-{
- return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->datatype);
-}
-
-static ssize_t mdev_link_datatype_store(struct config_item *item,
- const char *page, size_t count)
-{
- struct mdev_link *mdev_link = to_mdev_link(item);
-
- if (!sysfs_streq(page, "control") && !sysfs_streq(page, "async") &&
- !sysfs_streq(page, "sync") && !sysfs_streq(page, "isoc") &&
- !sysfs_streq(page, "isoc_avp"))
- return -EINVAL;
- strcpy(mdev_link->datatype, page);
- strim(mdev_link->datatype);
- return count;
-}
-
-static ssize_t mdev_link_device_show(struct config_item *item, char *page)
-{
- return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->device);
-}
-
-static ssize_t mdev_link_device_store(struct config_item *item,
- const char *page, size_t count)
-{
- struct mdev_link *mdev_link = to_mdev_link(item);
-
- strlcpy(mdev_link->device, page, sizeof(mdev_link->device));
- strim(mdev_link->device);
- return count;
-}
-
-static ssize_t mdev_link_channel_show(struct config_item *item, char *page)
-{
- return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->channel);
-}
-
-static ssize_t mdev_link_channel_store(struct config_item *item,
- const char *page, size_t count)
-{
- struct mdev_link *mdev_link = to_mdev_link(item);
-
- strlcpy(mdev_link->channel, page, sizeof(mdev_link->channel));
- strim(mdev_link->channel);
- return count;
-}
-
-static ssize_t mdev_link_comp_show(struct config_item *item, char *page)
-{
- return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->comp);
-}
-
-static ssize_t mdev_link_comp_store(struct config_item *item,
- const char *page, size_t count)
-{
- struct mdev_link *mdev_link = to_mdev_link(item);
-
- strlcpy(mdev_link->comp, page, sizeof(mdev_link->comp));
- strim(mdev_link->comp);
- return count;
-}
-
-static ssize_t mdev_link_comp_params_show(struct config_item *item, char *page)
-{
- return snprintf(page, PAGE_SIZE, "%s\n",
- to_mdev_link(item)->comp_params);
-}
-
-static ssize_t mdev_link_comp_params_store(struct config_item *item,
- const char *page, size_t count)
-{
- struct mdev_link *mdev_link = to_mdev_link(item);
-
- strlcpy(mdev_link->comp_params, page, sizeof(mdev_link->comp_params));
- strim(mdev_link->comp_params);
- return count;
-}
-
-static ssize_t mdev_link_num_buffers_show(struct config_item *item, char *page)
-{
- return snprintf(page, PAGE_SIZE, "%d\n",
- to_mdev_link(item)->num_buffers);
-}
-
-static ssize_t mdev_link_num_buffers_store(struct config_item *item,
- const char *page, size_t count)
-{
- struct mdev_link *mdev_link = to_mdev_link(item);
- int ret;
-
- ret = kstrtou16(page, 0, &mdev_link->num_buffers);
- if (ret)
- return ret;
- return count;
-}
-
-static ssize_t mdev_link_buffer_size_show(struct config_item *item, char *page)
-{
- return snprintf(page, PAGE_SIZE, "%d\n",
- to_mdev_link(item)->buffer_size);
-}
-
-static ssize_t mdev_link_buffer_size_store(struct config_item *item,
- const char *page, size_t count)
-{
- struct mdev_link *mdev_link = to_mdev_link(item);
- int ret;
-
- ret = kstrtou16(page, 0, &mdev_link->buffer_size);
- if (ret)
- return ret;
- return count;
-}
-
-static ssize_t mdev_link_subbuffer_size_show(struct config_item *item,
- char *page)
-{
- return snprintf(page, PAGE_SIZE, "%d\n",
- to_mdev_link(item)->subbuffer_size);
-}
-
-static ssize_t mdev_link_subbuffer_size_store(struct config_item *item,
- const char *page, size_t count)
-{
- struct mdev_link *mdev_link = to_mdev_link(item);
- int ret;
-
- ret = kstrtou16(page, 0, &mdev_link->subbuffer_size);
- if (ret)
- return ret;
- return count;
-}
-
-static ssize_t mdev_link_packets_per_xact_show(struct config_item *item,
- char *page)
-{
- return snprintf(page, PAGE_SIZE, "%d\n",
- to_mdev_link(item)->packets_per_xact);
-}
-
-static ssize_t mdev_link_packets_per_xact_store(struct config_item *item,
- const char *page, size_t count)
-{
- struct mdev_link *mdev_link = to_mdev_link(item);
- int ret;
-
- ret = kstrtou16(page, 0, &mdev_link->packets_per_xact);
- if (ret)
- return ret;
- return count;
-}
-
-static ssize_t mdev_link_dbr_size_show(struct config_item *item, char *page)
-{
- return snprintf(page, PAGE_SIZE, "%d\n", to_mdev_link(item)->dbr_size);
-}
-
-static ssize_t mdev_link_dbr_size_store(struct config_item *item,
- const char *page, size_t count)
-{
- struct mdev_link *mdev_link = to_mdev_link(item);
- int ret;
-
- ret = kstrtou16(page, 0, &mdev_link->dbr_size);
- if (ret)
- return ret;
- return count;
-}
-
-CONFIGFS_ATTR_WO(mdev_link_, create_link);
-CONFIGFS_ATTR_WO(mdev_link_, destroy_link);
-CONFIGFS_ATTR(mdev_link_, device);
-CONFIGFS_ATTR(mdev_link_, channel);
-CONFIGFS_ATTR(mdev_link_, comp);
-CONFIGFS_ATTR(mdev_link_, comp_params);
-CONFIGFS_ATTR(mdev_link_, num_buffers);
-CONFIGFS_ATTR(mdev_link_, buffer_size);
-CONFIGFS_ATTR(mdev_link_, subbuffer_size);
-CONFIGFS_ATTR(mdev_link_, packets_per_xact);
-CONFIGFS_ATTR(mdev_link_, datatype);
-CONFIGFS_ATTR(mdev_link_, direction);
-CONFIGFS_ATTR(mdev_link_, dbr_size);
-
-static struct configfs_attribute *mdev_link_attrs[] = {
- &mdev_link_attr_create_link,
- &mdev_link_attr_destroy_link,
- &mdev_link_attr_device,
- &mdev_link_attr_channel,
- &mdev_link_attr_comp,
- &mdev_link_attr_comp_params,
- &mdev_link_attr_num_buffers,
- &mdev_link_attr_buffer_size,
- &mdev_link_attr_subbuffer_size,
- &mdev_link_attr_packets_per_xact,
- &mdev_link_attr_datatype,
- &mdev_link_attr_direction,
- &mdev_link_attr_dbr_size,
- NULL,
-};
-
-static void mdev_link_release(struct config_item *item)
-{
- struct mdev_link *mdev_link = to_mdev_link(item);
- int ret;
-
- if (mdev_link->destroy_link)
- goto free_item;
-
- ret = most_remove_link(mdev_link->device, mdev_link->channel,
- mdev_link->comp);
- if (ret) {
- pr_err("Removing link failed.\n");
- goto free_item;
- }
-
- if (!list_empty(&mdev_link_list))
- list_del(&mdev_link->list);
-
-free_item:
- kfree(to_mdev_link(item));
-}
-
-static struct configfs_item_operations mdev_link_item_ops = {
- .release = mdev_link_release,
-};
-
-static const struct config_item_type mdev_link_type = {
- .ct_item_ops = &mdev_link_item_ops,
- .ct_attrs = mdev_link_attrs,
- .ct_owner = THIS_MODULE,
-};
-
-struct most_common {
- struct config_group group;
- struct module *mod;
- struct configfs_subsystem subsys;
-};
-
-static struct most_common *to_most_common(struct configfs_subsystem *subsys)
-{
- return container_of(subsys, struct most_common, subsys);
-}
-
-static struct config_item *most_common_make_item(struct config_group *group,
- const char *name)
-{
- struct mdev_link *mdev_link;
- struct most_common *mc = to_most_common(group->cg_subsys);
-
- mdev_link = kzalloc(sizeof(*mdev_link), GFP_KERNEL);
- if (!mdev_link)
- return ERR_PTR(-ENOMEM);
-
- if (!try_module_get(mc->mod)) {
- kfree(mdev_link);
- return ERR_PTR(-ENOLCK);
- }
- config_item_init_type_name(&mdev_link->item, name,
- &mdev_link_type);
-
- if (!strcmp(group->cg_item.ci_namebuf, "most_cdev"))
- strcpy(mdev_link->comp, "cdev");
- else if (!strcmp(group->cg_item.ci_namebuf, "most_net"))
- strcpy(mdev_link->comp, "net");
- else if (!strcmp(group->cg_item.ci_namebuf, "most_video"))
- strcpy(mdev_link->comp, "video");
- strcpy(mdev_link->name, name);
- return &mdev_link->item;
-}
-
-static void most_common_release(struct config_item *item)
-{
- struct config_group *group = to_config_group(item);
-
- kfree(to_most_common(group->cg_subsys));
-}
-
-static struct configfs_item_operations most_common_item_ops = {
- .release = most_common_release,
-};
-
-static void most_common_disconnect(struct config_group *group,
- struct config_item *item)
-{
- struct most_common *mc = to_most_common(group->cg_subsys);
-
- module_put(mc->mod);
-}
-
-static struct configfs_group_operations most_common_group_ops = {
- .make_item = most_common_make_item,
- .disconnect_notify = most_common_disconnect,
-};
-
-static const struct config_item_type most_common_type = {
- .ct_item_ops = &most_common_item_ops,
- .ct_group_ops = &most_common_group_ops,
- .ct_owner = THIS_MODULE,
-};
-
-static struct most_common most_cdev = {
- .subsys = {
- .su_group = {
- .cg_item = {
- .ci_namebuf = "most_cdev",
- .ci_type = &most_common_type,
- },
- },
- },
-};
-
-static struct most_common most_net = {
- .subsys = {
- .su_group = {
- .cg_item = {
- .ci_namebuf = "most_net",
- .ci_type = &most_common_type,
- },
- },
- },
-};
-
-static struct most_common most_video = {
- .subsys = {
- .su_group = {
- .cg_item = {
- .ci_namebuf = "most_video",
- .ci_type = &most_common_type,
- },
- },
- },
-};
-
-struct most_snd_grp {
- struct config_group group;
- bool create_card;
- struct list_head list;
-};
-
-static struct most_snd_grp *to_most_snd_grp(struct config_item *item)
-{
- return container_of(to_config_group(item), struct most_snd_grp, group);
-}
-
-static struct config_item *most_snd_grp_make_item(struct config_group *group,
- const char *name)
-{
- struct mdev_link *mdev_link;
-
- mdev_link = kzalloc(sizeof(*mdev_link), GFP_KERNEL);
- if (!mdev_link)
- return ERR_PTR(-ENOMEM);
-
- config_item_init_type_name(&mdev_link->item, name, &mdev_link_type);
- mdev_link->create_link = false;
- strcpy(mdev_link->name, name);
- strcpy(mdev_link->comp, "sound");
- return &mdev_link->item;
-}
-
-static ssize_t most_snd_grp_create_card_store(struct config_item *item,
- const char *page, size_t count)
-{
- struct most_snd_grp *snd_grp = to_most_snd_grp(item);
- int ret;
- bool tmp;
-
- ret = kstrtobool(page, &tmp);
- if (ret)
- return ret;
- if (tmp) {
- ret = most_cfg_complete("sound");
- if (ret)
- return ret;
- }
- snd_grp->create_card = tmp;
- return count;
-}
-
-CONFIGFS_ATTR_WO(most_snd_grp_, create_card);
-
-static struct configfs_attribute *most_snd_grp_attrs[] = {
- &most_snd_grp_attr_create_card,
- NULL,
-};
-
-static void most_snd_grp_release(struct config_item *item)
-{
- struct most_snd_grp *group = to_most_snd_grp(item);
-
- list_del(&group->list);
- kfree(group);
-}
-
-static struct configfs_item_operations most_snd_grp_item_ops = {
- .release = most_snd_grp_release,
-};
-
-static struct configfs_group_operations most_snd_grp_group_ops = {
- .make_item = most_snd_grp_make_item,
-};
-
-static const struct config_item_type most_snd_grp_type = {
- .ct_item_ops = &most_snd_grp_item_ops,
- .ct_group_ops = &most_snd_grp_group_ops,
- .ct_attrs = most_snd_grp_attrs,
- .ct_owner = THIS_MODULE,
-};
-
-struct most_sound {
- struct configfs_subsystem subsys;
- struct list_head soundcard_list;
- struct module *mod;
-};
-
-static struct config_group *most_sound_make_group(struct config_group *group,
- const char *name)
-{
- struct most_snd_grp *most;
- struct most_sound *ms = container_of(group->cg_subsys,
- struct most_sound, subsys);
-
- list_for_each_entry(most, &ms->soundcard_list, list) {
- if (!most->create_card) {
- pr_info("adapter configuration still in progress.\n");
- return ERR_PTR(-EPROTO);
- }
- }
- if (!try_module_get(ms->mod))
- return ERR_PTR(-ENOLCK);
- most = kzalloc(sizeof(*most), GFP_KERNEL);
- if (!most) {
- module_put(ms->mod);
- return ERR_PTR(-ENOMEM);
- }
- config_group_init_type_name(&most->group, name, &most_snd_grp_type);
- list_add_tail(&most->list, &ms->soundcard_list);
- return &most->group;
-}
-
-static void most_sound_disconnect(struct config_group *group,
- struct config_item *item)
-{
- struct most_sound *ms = container_of(group->cg_subsys,
- struct most_sound, subsys);
- module_put(ms->mod);
-}
-
-static struct configfs_group_operations most_sound_group_ops = {
- .make_group = most_sound_make_group,
- .disconnect_notify = most_sound_disconnect,
-};
-
-static const struct config_item_type most_sound_type = {
- .ct_group_ops = &most_sound_group_ops,
- .ct_owner = THIS_MODULE,
-};
-
-static struct most_sound most_sound_subsys = {
- .subsys = {
- .su_group = {
- .cg_item = {
- .ci_namebuf = "most_sound",
- .ci_type = &most_sound_type,
- },
- },
- },
-};
-
-int most_register_configfs_subsys(struct most_component *c)
-{
- int ret;
-
- if (!strcmp(c->name, "cdev")) {
- most_cdev.mod = c->mod;
- ret = configfs_register_subsystem(&most_cdev.subsys);
- } else if (!strcmp(c->name, "net")) {
- most_net.mod = c->mod;
- ret = configfs_register_subsystem(&most_net.subsys);
- } else if (!strcmp(c->name, "video")) {
- most_video.mod = c->mod;
- ret = configfs_register_subsystem(&most_video.subsys);
- } else if (!strcmp(c->name, "sound")) {
- most_sound_subsys.mod = c->mod;
- ret = configfs_register_subsystem(&most_sound_subsys.subsys);
- } else {
- return -ENODEV;
- }
-
- if (ret) {
- pr_err("Error %d while registering subsystem %s\n",
- ret, c->name);
- }
- return ret;
-}
-EXPORT_SYMBOL_GPL(most_register_configfs_subsys);
-
-void most_interface_register_notify(const char *mdev)
-{
- bool register_snd_card = false;
- struct mdev_link *mdev_link;
-
- list_for_each_entry(mdev_link, &mdev_link_list, list) {
- if (!strcmp(mdev_link->device, mdev)) {
- set_config_and_add_link(mdev_link);
- if (!strcmp(mdev_link->comp, "sound"))
- register_snd_card = true;
- }
- }
- if (register_snd_card)
- most_cfg_complete("sound");
-}
-
-void most_deregister_configfs_subsys(struct most_component *c)
-{
- if (!strcmp(c->name, "cdev"))
- configfs_unregister_subsystem(&most_cdev.subsys);
- else if (!strcmp(c->name, "net"))
- configfs_unregister_subsystem(&most_net.subsys);
- else if (!strcmp(c->name, "video"))
- configfs_unregister_subsystem(&most_video.subsys);
- else if (!strcmp(c->name, "sound"))
- configfs_unregister_subsystem(&most_sound_subsys.subsys);
-}
-EXPORT_SYMBOL_GPL(most_deregister_configfs_subsys);
-
-int __init configfs_init(void)
-{
- config_group_init(&most_cdev.subsys.su_group);
- mutex_init(&most_cdev.subsys.su_mutex);
-
- config_group_init(&most_net.subsys.su_group);
- mutex_init(&most_net.subsys.su_mutex);
-
- config_group_init(&most_video.subsys.su_group);
- mutex_init(&most_video.subsys.su_mutex);
-
- config_group_init(&most_sound_subsys.subsys.su_group);
- mutex_init(&most_sound_subsys.subsys.su_mutex);
-
- INIT_LIST_HEAD(&most_sound_subsys.soundcard_list);
- INIT_LIST_HEAD(&mdev_link_list);
-
- return 0;
-}
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * core.c - Implementation of core module of MOST Linux driver stack
- *
- * Copyright (C) 2013-2020 Microchip Technology Germany II GmbH & Co. KG
- */
-
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/device.h>
-#include <linux/list.h>
-#include <linux/poll.h>
-#include <linux/wait.h>
-#include <linux/kobject.h>
-#include <linux/mutex.h>
-#include <linux/completion.h>
-#include <linux/sysfs.h>
-#include <linux/kthread.h>
-#include <linux/dma-mapping.h>
-#include <linux/idr.h>
-
-#include "most.h"
-
-#define MAX_CHANNELS 64
-#define STRING_SIZE 80
-
-static struct ida mdev_id;
-static int dummy_num_buffers;
-static struct list_head comp_list;
-
-struct pipe {
- struct most_component *comp;
- int refs;
- int num_buffers;
-};
-
-struct most_channel {
- struct device dev;
- struct completion cleanup;
- atomic_t mbo_ref;
- atomic_t mbo_nq_level;
- u16 channel_id;
- char name[STRING_SIZE];
- bool is_poisoned;
- struct mutex start_mutex; /* channel activation synchronization */
- struct mutex nq_mutex; /* nq thread synchronization */
- int is_starving;
- struct most_interface *iface;
- struct most_channel_config cfg;
- bool keep_mbo;
- bool enqueue_halt;
- struct list_head fifo;
- spinlock_t fifo_lock; /* fifo access synchronization */
- struct list_head halt_fifo;
- struct list_head list;
- struct pipe pipe0;
- struct pipe pipe1;
- struct list_head trash_fifo;
- struct task_struct *hdm_enqueue_task;
- wait_queue_head_t hdm_fifo_wq;
-
-};
-
-#define to_channel(d) container_of(d, struct most_channel, dev)
-
-struct interface_private {
- int dev_id;
- char name[STRING_SIZE];
- struct most_channel *channel[MAX_CHANNELS];
- struct list_head channel_list;
-};
-
-static const struct {
- int most_ch_data_type;
- const char *name;
-} ch_data_type[] = {
- { MOST_CH_CONTROL, "control" },
- { MOST_CH_ASYNC, "async" },
- { MOST_CH_SYNC, "sync" },
- { MOST_CH_ISOC, "isoc"},
- { MOST_CH_ISOC, "isoc_avp"},
-};
-
-/**
- * list_pop_mbo - retrieves the first MBO of the list and removes it
- * @ptr: the list head to grab the MBO from.
- */
-#define list_pop_mbo(ptr) \
-({ \
- struct mbo *_mbo = list_first_entry(ptr, struct mbo, list); \
- list_del(&_mbo->list); \
- _mbo; \
-})
-
-/**
- * most_free_mbo_coherent - free an MBO and its coherent buffer
- * @mbo: most buffer
- */
-static void most_free_mbo_coherent(struct mbo *mbo)
-{
- struct most_channel *c = mbo->context;
- u16 const coherent_buf_size = c->cfg.buffer_size + c->cfg.extra_len;
-
- if (c->iface->dma_free)
- c->iface->dma_free(mbo, coherent_buf_size);
- else
- kfree(mbo->virt_address);
- kfree(mbo);
- if (atomic_sub_and_test(1, &c->mbo_ref))
- complete(&c->cleanup);
-}
-
-/**
- * flush_channel_fifos - clear the channel fifos
- * @c: pointer to channel object
- */
-static void flush_channel_fifos(struct most_channel *c)
-{
- unsigned long flags, hf_flags;
- struct mbo *mbo, *tmp;
-
- if (list_empty(&c->fifo) && list_empty(&c->halt_fifo))
- return;
-
- spin_lock_irqsave(&c->fifo_lock, flags);
- list_for_each_entry_safe(mbo, tmp, &c->fifo, list) {
- list_del(&mbo->list);
- spin_unlock_irqrestore(&c->fifo_lock, flags);
- most_free_mbo_coherent(mbo);
- spin_lock_irqsave(&c->fifo_lock, flags);
- }
- spin_unlock_irqrestore(&c->fifo_lock, flags);
-
- spin_lock_irqsave(&c->fifo_lock, hf_flags);
- list_for_each_entry_safe(mbo, tmp, &c->halt_fifo, list) {
- list_del(&mbo->list);
- spin_unlock_irqrestore(&c->fifo_lock, hf_flags);
- most_free_mbo_coherent(mbo);
- spin_lock_irqsave(&c->fifo_lock, hf_flags);
- }
- spin_unlock_irqrestore(&c->fifo_lock, hf_flags);
-
- if (unlikely((!list_empty(&c->fifo) || !list_empty(&c->halt_fifo))))
- dev_warn(&c->dev, "Channel or trash fifo not empty\n");
-}
-
-/**
- * flush_trash_fifo - clear the trash fifo
- * @c: pointer to channel object
- */
-static int flush_trash_fifo(struct most_channel *c)
-{
- struct mbo *mbo, *tmp;
- unsigned long flags;
-
- spin_lock_irqsave(&c->fifo_lock, flags);
- list_for_each_entry_safe(mbo, tmp, &c->trash_fifo, list) {
- list_del(&mbo->list);
- spin_unlock_irqrestore(&c->fifo_lock, flags);
- most_free_mbo_coherent(mbo);
- spin_lock_irqsave(&c->fifo_lock, flags);
- }
- spin_unlock_irqrestore(&c->fifo_lock, flags);
- return 0;
-}
-
-static ssize_t available_directions_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct most_channel *c = to_channel(dev);
- unsigned int i = c->channel_id;
-
- strcpy(buf, "");
- if (c->iface->channel_vector[i].direction & MOST_CH_RX)
- strcat(buf, "rx ");
- if (c->iface->channel_vector[i].direction & MOST_CH_TX)
- strcat(buf, "tx ");
- strcat(buf, "\n");
- return strlen(buf);
-}
-
-static ssize_t available_datatypes_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct most_channel *c = to_channel(dev);
- unsigned int i = c->channel_id;
-
- strcpy(buf, "");
- if (c->iface->channel_vector[i].data_type & MOST_CH_CONTROL)
- strcat(buf, "control ");
- if (c->iface->channel_vector[i].data_type & MOST_CH_ASYNC)
- strcat(buf, "async ");
- if (c->iface->channel_vector[i].data_type & MOST_CH_SYNC)
- strcat(buf, "sync ");
- if (c->iface->channel_vector[i].data_type & MOST_CH_ISOC)
- strcat(buf, "isoc ");
- strcat(buf, "\n");
- return strlen(buf);
-}
-
-static ssize_t number_of_packet_buffers_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct most_channel *c = to_channel(dev);
- unsigned int i = c->channel_id;
-
- return snprintf(buf, PAGE_SIZE, "%d\n",
- c->iface->channel_vector[i].num_buffers_packet);
-}
-
-static ssize_t number_of_stream_buffers_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct most_channel *c = to_channel(dev);
- unsigned int i = c->channel_id;
-
- return snprintf(buf, PAGE_SIZE, "%d\n",
- c->iface->channel_vector[i].num_buffers_streaming);
-}
-
-static ssize_t size_of_packet_buffer_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct most_channel *c = to_channel(dev);
- unsigned int i = c->channel_id;
-
- return snprintf(buf, PAGE_SIZE, "%d\n",
- c->iface->channel_vector[i].buffer_size_packet);
-}
-
-static ssize_t size_of_stream_buffer_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct most_channel *c = to_channel(dev);
- unsigned int i = c->channel_id;
-
- return snprintf(buf, PAGE_SIZE, "%d\n",
- c->iface->channel_vector[i].buffer_size_streaming);
-}
-
-static ssize_t channel_starving_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct most_channel *c = to_channel(dev);
-
- return snprintf(buf, PAGE_SIZE, "%d\n", c->is_starving);
-}
-
-static ssize_t set_number_of_buffers_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct most_channel *c = to_channel(dev);
-
- return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.num_buffers);
-}
-
-static ssize_t set_buffer_size_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct most_channel *c = to_channel(dev);
-
- return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.buffer_size);
-}
-
-static ssize_t set_direction_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct most_channel *c = to_channel(dev);
-
- if (c->cfg.direction & MOST_CH_TX)
- return snprintf(buf, PAGE_SIZE, "tx\n");
- else if (c->cfg.direction & MOST_CH_RX)
- return snprintf(buf, PAGE_SIZE, "rx\n");
- return snprintf(buf, PAGE_SIZE, "unconfigured\n");
-}
-
-static ssize_t set_datatype_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- int i;
- struct most_channel *c = to_channel(dev);
-
- for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) {
- if (c->cfg.data_type & ch_data_type[i].most_ch_data_type)
- return snprintf(buf, PAGE_SIZE, "%s",
- ch_data_type[i].name);
- }
- return snprintf(buf, PAGE_SIZE, "unconfigured\n");
-}
-
-static ssize_t set_subbuffer_size_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct most_channel *c = to_channel(dev);
-
- return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.subbuffer_size);
-}
-
-static ssize_t set_packets_per_xact_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct most_channel *c = to_channel(dev);
-
- return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.packets_per_xact);
-}
-
-static ssize_t set_dbr_size_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct most_channel *c = to_channel(dev);
-
- return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.dbr_size);
-}
-
-#define to_dev_attr(a) container_of(a, struct device_attribute, attr)
-static umode_t channel_attr_is_visible(struct kobject *kobj,
- struct attribute *attr, int index)
-{
- struct device_attribute *dev_attr = to_dev_attr(attr);
- struct device *dev = kobj_to_dev(kobj);
- struct most_channel *c = to_channel(dev);
-
- if (!strcmp(dev_attr->attr.name, "set_dbr_size") &&
- (c->iface->interface != ITYPE_MEDIALB_DIM2))
- return 0;
- if (!strcmp(dev_attr->attr.name, "set_packets_per_xact") &&
- (c->iface->interface != ITYPE_USB))
- return 0;
-
- return attr->mode;
-}
-
-#define DEV_ATTR(_name) (&dev_attr_##_name.attr)
-
-static DEVICE_ATTR_RO(available_directions);
-static DEVICE_ATTR_RO(available_datatypes);
-static DEVICE_ATTR_RO(number_of_packet_buffers);
-static DEVICE_ATTR_RO(number_of_stream_buffers);
-static DEVICE_ATTR_RO(size_of_stream_buffer);
-static DEVICE_ATTR_RO(size_of_packet_buffer);
-static DEVICE_ATTR_RO(channel_starving);
-static DEVICE_ATTR_RO(set_buffer_size);
-static DEVICE_ATTR_RO(set_number_of_buffers);
-static DEVICE_ATTR_RO(set_direction);
-static DEVICE_ATTR_RO(set_datatype);
-static DEVICE_ATTR_RO(set_subbuffer_size);
-static DEVICE_ATTR_RO(set_packets_per_xact);
-static DEVICE_ATTR_RO(set_dbr_size);
-
-static struct attribute *channel_attrs[] = {
- DEV_ATTR(available_directions),
- DEV_ATTR(available_datatypes),
- DEV_ATTR(number_of_packet_buffers),
- DEV_ATTR(number_of_stream_buffers),
- DEV_ATTR(size_of_stream_buffer),
- DEV_ATTR(size_of_packet_buffer),
- DEV_ATTR(channel_starving),
- DEV_ATTR(set_buffer_size),
- DEV_ATTR(set_number_of_buffers),
- DEV_ATTR(set_direction),
- DEV_ATTR(set_datatype),
- DEV_ATTR(set_subbuffer_size),
- DEV_ATTR(set_packets_per_xact),
- DEV_ATTR(set_dbr_size),
- NULL,
-};
-
-static struct attribute_group channel_attr_group = {
- .attrs = channel_attrs,
- .is_visible = channel_attr_is_visible,
-};
-
-static const struct attribute_group *channel_attr_groups[] = {
- &channel_attr_group,
- NULL,
-};
-
-static ssize_t description_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct most_interface *iface = dev_get_drvdata(dev);
-
- return snprintf(buf, PAGE_SIZE, "%s\n", iface->description);
-}
-
-static ssize_t interface_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct most_interface *iface = dev_get_drvdata(dev);
-
- switch (iface->interface) {
- case ITYPE_LOOPBACK:
- return snprintf(buf, PAGE_SIZE, "loopback\n");
- case ITYPE_I2C:
- return snprintf(buf, PAGE_SIZE, "i2c\n");
- case ITYPE_I2S:
- return snprintf(buf, PAGE_SIZE, "i2s\n");
- case ITYPE_TSI:
- return snprintf(buf, PAGE_SIZE, "tsi\n");
- case ITYPE_HBI:
- return snprintf(buf, PAGE_SIZE, "hbi\n");
- case ITYPE_MEDIALB_DIM:
- return snprintf(buf, PAGE_SIZE, "mlb_dim\n");
- case ITYPE_MEDIALB_DIM2:
- return snprintf(buf, PAGE_SIZE, "mlb_dim2\n");
- case ITYPE_USB:
- return snprintf(buf, PAGE_SIZE, "usb\n");
- case ITYPE_PCIE:
- return snprintf(buf, PAGE_SIZE, "pcie\n");
- }
- return snprintf(buf, PAGE_SIZE, "unknown\n");
-}
-
-static DEVICE_ATTR_RO(description);
-static DEVICE_ATTR_RO(interface);
-
-static struct attribute *interface_attrs[] = {
- DEV_ATTR(description),
- DEV_ATTR(interface),
- NULL,
-};
-
-static struct attribute_group interface_attr_group = {
- .attrs = interface_attrs,
-};
-
-static const struct attribute_group *interface_attr_groups[] = {
- &interface_attr_group,
- NULL,
-};
-
-static struct most_component *match_component(char *name)
-{
- struct most_component *comp;
-
- list_for_each_entry(comp, &comp_list, list) {
- if (!strcmp(comp->name, name))
- return comp;
- }
- return NULL;
-}
-
-struct show_links_data {
- int offs;
- char *buf;
-};
-
-static int print_links(struct device *dev, void *data)
-{
- struct show_links_data *d = data;
- int offs = d->offs;
- char *buf = d->buf;
- struct most_channel *c;
- struct most_interface *iface = dev_get_drvdata(dev);
-
- list_for_each_entry(c, &iface->p->channel_list, list) {
- if (c->pipe0.comp) {
- offs += scnprintf(buf + offs,
- PAGE_SIZE - offs,
- "%s:%s:%s\n",
- c->pipe0.comp->name,
- dev_name(iface->dev),
- dev_name(&c->dev));
- }
- if (c->pipe1.comp) {
- offs += scnprintf(buf + offs,
- PAGE_SIZE - offs,
- "%s:%s:%s\n",
- c->pipe1.comp->name,
- dev_name(iface->dev),
- dev_name(&c->dev));
- }
- }
- d->offs = offs;
- return 0;
-}
-
-static int most_match(struct device *dev, struct device_driver *drv)
-{
- if (!strcmp(dev_name(dev), "most"))
- return 0;
- else
- return 1;
-}
-
-static struct bus_type mostbus = {
- .name = "most",
- .match = most_match,
-};
-
-static ssize_t links_show(struct device_driver *drv, char *buf)
-{
- struct show_links_data d = { .buf = buf };
-
- bus_for_each_dev(&mostbus, NULL, &d, print_links);
- return d.offs;
-}
-
-static ssize_t components_show(struct device_driver *drv, char *buf)
-{
- struct most_component *comp;
- int offs = 0;
-
- list_for_each_entry(comp, &comp_list, list) {
- offs += scnprintf(buf + offs, PAGE_SIZE - offs, "%s\n",
- comp->name);
- }
- return offs;
-}
-
-/**
- * get_channel - get pointer to channel
- * @mdev: name of the device interface
- * @mdev_ch: name of channel
- */
-static struct most_channel *get_channel(char *mdev, char *mdev_ch)
-{
- struct device *dev = NULL;
- struct most_interface *iface;
- struct most_channel *c, *tmp;
-
- dev = bus_find_device_by_name(&mostbus, NULL, mdev);
- if (!dev)
- return NULL;
- put_device(dev);
- iface = dev_get_drvdata(dev);
- list_for_each_entry_safe(c, tmp, &iface->p->channel_list, list) {
- if (!strcmp(dev_name(&c->dev), mdev_ch))
- return c;
- }
- return NULL;
-}
-
-static
-inline int link_channel_to_component(struct most_channel *c,
- struct most_component *comp,
- char *name,
- char *comp_param)
-{
- int ret;
- struct most_component **comp_ptr;
-
- if (!c->pipe0.comp)
- comp_ptr = &c->pipe0.comp;
- else if (!c->pipe1.comp)
- comp_ptr = &c->pipe1.comp;
- else
- return -ENOSPC;
-
- *comp_ptr = comp;
- ret = comp->probe_channel(c->iface, c->channel_id, &c->cfg, name,
- comp_param);
- if (ret) {
- *comp_ptr = NULL;
- return ret;
- }
- return 0;
-}
-
-int most_set_cfg_buffer_size(char *mdev, char *mdev_ch, u16 val)
-{
- struct most_channel *c = get_channel(mdev, mdev_ch);
-
- if (!c)
- return -ENODEV;
- c->cfg.buffer_size = val;
- return 0;
-}
-
-int most_set_cfg_subbuffer_size(char *mdev, char *mdev_ch, u16 val)
-{
- struct most_channel *c = get_channel(mdev, mdev_ch);
-
- if (!c)
- return -ENODEV;
- c->cfg.subbuffer_size = val;
- return 0;
-}
-
-int most_set_cfg_dbr_size(char *mdev, char *mdev_ch, u16 val)
-{
- struct most_channel *c = get_channel(mdev, mdev_ch);
-
- if (!c)
- return -ENODEV;
- c->cfg.dbr_size = val;
- return 0;
-}
-
-int most_set_cfg_num_buffers(char *mdev, char *mdev_ch, u16 val)
-{
- struct most_channel *c = get_channel(mdev, mdev_ch);
-
- if (!c)
- return -ENODEV;
- c->cfg.num_buffers = val;
- return 0;
-}
-
-int most_set_cfg_datatype(char *mdev, char *mdev_ch, char *buf)
-{
- int i;
- struct most_channel *c = get_channel(mdev, mdev_ch);
-
- if (!c)
- return -ENODEV;
- for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) {
- if (!strcmp(buf, ch_data_type[i].name)) {
- c->cfg.data_type = ch_data_type[i].most_ch_data_type;
- break;
- }
- }
-
- if (i == ARRAY_SIZE(ch_data_type))
- dev_warn(&c->dev, "Invalid attribute settings\n");
- return 0;
-}
-
-int most_set_cfg_direction(char *mdev, char *mdev_ch, char *buf)
-{
- struct most_channel *c = get_channel(mdev, mdev_ch);
-
- if (!c)
- return -ENODEV;
- if (!strcmp(buf, "dir_rx")) {
- c->cfg.direction = MOST_CH_RX;
- } else if (!strcmp(buf, "rx")) {
- c->cfg.direction = MOST_CH_RX;
- } else if (!strcmp(buf, "dir_tx")) {
- c->cfg.direction = MOST_CH_TX;
- } else if (!strcmp(buf, "tx")) {
- c->cfg.direction = MOST_CH_TX;
- } else {
- dev_err(&c->dev, "Invalid direction\n");
- return -ENODATA;
- }
- return 0;
-}
-
-int most_set_cfg_packets_xact(char *mdev, char *mdev_ch, u16 val)
-{
- struct most_channel *c = get_channel(mdev, mdev_ch);
-
- if (!c)
- return -ENODEV;
- c->cfg.packets_per_xact = val;
- return 0;
-}
-
-int most_cfg_complete(char *comp_name)
-{
- struct most_component *comp;
-
- comp = match_component(comp_name);
- if (!comp)
- return -ENODEV;
-
- return comp->cfg_complete();
-}
-
-int most_add_link(char *mdev, char *mdev_ch, char *comp_name, char *link_name,
- char *comp_param)
-{
- struct most_channel *c = get_channel(mdev, mdev_ch);
- struct most_component *comp = match_component(comp_name);
-
- if (!c || !comp)
- return -ENODEV;
-
- return link_channel_to_component(c, comp, link_name, comp_param);
-}
-
-int most_remove_link(char *mdev, char *mdev_ch, char *comp_name)
-{
- struct most_channel *c;
- struct most_component *comp;
-
- comp = match_component(comp_name);
- if (!comp)
- return -ENODEV;
- c = get_channel(mdev, mdev_ch);
- if (!c)
- return -ENODEV;
-
- if (comp->disconnect_channel(c->iface, c->channel_id))
- return -EIO;
- if (c->pipe0.comp == comp)
- c->pipe0.comp = NULL;
- if (c->pipe1.comp == comp)
- c->pipe1.comp = NULL;
- return 0;
-}
-
-#define DRV_ATTR(_name) (&driver_attr_##_name.attr)
-
-static DRIVER_ATTR_RO(links);
-static DRIVER_ATTR_RO(components);
-
-static struct attribute *mc_attrs[] = {
- DRV_ATTR(links),
- DRV_ATTR(components),
- NULL,
-};
-
-static struct attribute_group mc_attr_group = {
- .attrs = mc_attrs,
-};
-
-static const struct attribute_group *mc_attr_groups[] = {
- &mc_attr_group,
- NULL,
-};
-
-static struct device_driver mostbus_driver = {
- .name = "most_core",
- .bus = &mostbus,
- .groups = mc_attr_groups,
-};
-
-static inline void trash_mbo(struct mbo *mbo)
-{
- unsigned long flags;
- struct most_channel *c = mbo->context;
-
- spin_lock_irqsave(&c->fifo_lock, flags);
- list_add(&mbo->list, &c->trash_fifo);
- spin_unlock_irqrestore(&c->fifo_lock, flags);
-}
-
-static bool hdm_mbo_ready(struct most_channel *c)
-{
- bool empty;
-
- if (c->enqueue_halt)
- return false;
-
- spin_lock_irq(&c->fifo_lock);
- empty = list_empty(&c->halt_fifo);
- spin_unlock_irq(&c->fifo_lock);
-
- return !empty;
-}
-
-static void nq_hdm_mbo(struct mbo *mbo)
-{
- unsigned long flags;
- struct most_channel *c = mbo->context;
-
- spin_lock_irqsave(&c->fifo_lock, flags);
- list_add_tail(&mbo->list, &c->halt_fifo);
- spin_unlock_irqrestore(&c->fifo_lock, flags);
- wake_up_interruptible(&c->hdm_fifo_wq);
-}
-
-static int hdm_enqueue_thread(void *data)
-{
- struct most_channel *c = data;
- struct mbo *mbo;
- int ret;
- typeof(c->iface->enqueue) enqueue = c->iface->enqueue;
-
- while (likely(!kthread_should_stop())) {
- wait_event_interruptible(c->hdm_fifo_wq,
- hdm_mbo_ready(c) ||
- kthread_should_stop());
-
- mutex_lock(&c->nq_mutex);
- spin_lock_irq(&c->fifo_lock);
- if (unlikely(c->enqueue_halt || list_empty(&c->halt_fifo))) {
- spin_unlock_irq(&c->fifo_lock);
- mutex_unlock(&c->nq_mutex);
- continue;
- }
-
- mbo = list_pop_mbo(&c->halt_fifo);
- spin_unlock_irq(&c->fifo_lock);
-
- if (c->cfg.direction == MOST_CH_RX)
- mbo->buffer_length = c->cfg.buffer_size;
-
- ret = enqueue(mbo->ifp, mbo->hdm_channel_id, mbo);
- mutex_unlock(&c->nq_mutex);
-
- if (unlikely(ret)) {
- dev_err(&c->dev, "Buffer enqueue failed\n");
- nq_hdm_mbo(mbo);
- c->hdm_enqueue_task = NULL;
- return 0;
- }
- }
-
- return 0;
-}
-
-static int run_enqueue_thread(struct most_channel *c, int channel_id)
-{
- struct task_struct *task =
- kthread_run(hdm_enqueue_thread, c, "hdm_fifo_%d",
- channel_id);
-
- if (IS_ERR(task))
- return PTR_ERR(task);
-
- c->hdm_enqueue_task = task;
- return 0;
-}
-
-/**
- * arm_mbo - recycle MBO for further usage
- * @mbo: most buffer
- *
- * This puts an MBO back to the list to have it ready for up coming
- * tx transactions.
- *
- * In case the MBO belongs to a channel that recently has been
- * poisoned, the MBO is scheduled to be trashed.
- * Calls the completion handler of an attached component.
- */
-static void arm_mbo(struct mbo *mbo)
-{
- unsigned long flags;
- struct most_channel *c;
-
- c = mbo->context;
-
- if (c->is_poisoned) {
- trash_mbo(mbo);
- return;
- }
-
- spin_lock_irqsave(&c->fifo_lock, flags);
- ++*mbo->num_buffers_ptr;
- list_add_tail(&mbo->list, &c->fifo);
- spin_unlock_irqrestore(&c->fifo_lock, flags);
-
- if (c->pipe0.refs && c->pipe0.comp->tx_completion)
- c->pipe0.comp->tx_completion(c->iface, c->channel_id);
-
- if (c->pipe1.refs && c->pipe1.comp->tx_completion)
- c->pipe1.comp->tx_completion(c->iface, c->channel_id);
-}
-
-/**
- * arm_mbo_chain - helper function that arms an MBO chain for the HDM
- * @c: pointer to interface channel
- * @dir: direction of the channel
- * @compl: pointer to completion function
- *
- * This allocates buffer objects including the containing DMA coherent
- * buffer and puts them in the fifo.
- * Buffers of Rx channels are put in the kthread fifo, hence immediately
- * submitted to the HDM.
- *
- * Returns the number of allocated and enqueued MBOs.
- */
-static int arm_mbo_chain(struct most_channel *c, int dir,
- void (*compl)(struct mbo *))
-{
- unsigned int i;
- struct mbo *mbo;
- unsigned long flags;
- u32 coherent_buf_size = c->cfg.buffer_size + c->cfg.extra_len;
-
- atomic_set(&c->mbo_nq_level, 0);
-
- for (i = 0; i < c->cfg.num_buffers; i++) {
- mbo = kzalloc(sizeof(*mbo), GFP_KERNEL);
- if (!mbo)
- goto flush_fifos;
-
- mbo->context = c;
- mbo->ifp = c->iface;
- mbo->hdm_channel_id = c->channel_id;
- if (c->iface->dma_alloc) {
- mbo->virt_address =
- c->iface->dma_alloc(mbo, coherent_buf_size);
- } else {
- mbo->virt_address =
- kzalloc(coherent_buf_size, GFP_KERNEL);
- }
- if (!mbo->virt_address)
- goto release_mbo;
-
- mbo->complete = compl;
- mbo->num_buffers_ptr = &dummy_num_buffers;
- if (dir == MOST_CH_RX) {
- nq_hdm_mbo(mbo);
- atomic_inc(&c->mbo_nq_level);
- } else {
- spin_lock_irqsave(&c->fifo_lock, flags);
- list_add_tail(&mbo->list, &c->fifo);
- spin_unlock_irqrestore(&c->fifo_lock, flags);
- }
- }
- return c->cfg.num_buffers;
-
-release_mbo:
- kfree(mbo);
-
-flush_fifos:
- flush_channel_fifos(c);
- return 0;
-}
-
-/**
- * most_submit_mbo - submits an MBO to fifo
- * @mbo: most buffer
- */
-void most_submit_mbo(struct mbo *mbo)
-{
- if (WARN_ONCE(!mbo || !mbo->context,
- "Bad buffer or missing channel reference\n"))
- return;
-
- nq_hdm_mbo(mbo);
-}
-EXPORT_SYMBOL_GPL(most_submit_mbo);
-
-/**
- * most_write_completion - write completion handler
- * @mbo: most buffer
- *
- * This recycles the MBO for further usage. In case the channel has been
- * poisoned, the MBO is scheduled to be trashed.
- */
-static void most_write_completion(struct mbo *mbo)
-{
- struct most_channel *c;
-
- c = mbo->context;
- if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE)))
- trash_mbo(mbo);
- else
- arm_mbo(mbo);
-}
-
-int channel_has_mbo(struct most_interface *iface, int id,
- struct most_component *comp)
-{
- struct most_channel *c = iface->p->channel[id];
- unsigned long flags;
- int empty;
-
- if (unlikely(!c))
- return -EINVAL;
-
- if (c->pipe0.refs && c->pipe1.refs &&
- ((comp == c->pipe0.comp && c->pipe0.num_buffers <= 0) ||
- (comp == c->pipe1.comp && c->pipe1.num_buffers <= 0)))
- return 0;
-
- spin_lock_irqsave(&c->fifo_lock, flags);
- empty = list_empty(&c->fifo);
- spin_unlock_irqrestore(&c->fifo_lock, flags);
- return !empty;
-}
-EXPORT_SYMBOL_GPL(channel_has_mbo);
-
-/**
- * most_get_mbo - get pointer to an MBO of pool
- * @iface: pointer to interface instance
- * @id: channel ID
- * @comp: driver component
- *
- * This attempts to get a free buffer out of the channel fifo.
- * Returns a pointer to MBO on success or NULL otherwise.
- */
-struct mbo *most_get_mbo(struct most_interface *iface, int id,
- struct most_component *comp)
-{
- struct mbo *mbo;
- struct most_channel *c;
- unsigned long flags;
- int *num_buffers_ptr;
-
- c = iface->p->channel[id];
- if (unlikely(!c))
- return NULL;
-
- if (c->pipe0.refs && c->pipe1.refs &&
- ((comp == c->pipe0.comp && c->pipe0.num_buffers <= 0) ||
- (comp == c->pipe1.comp && c->pipe1.num_buffers <= 0)))
- return NULL;
-
- if (comp == c->pipe0.comp)
- num_buffers_ptr = &c->pipe0.num_buffers;
- else if (comp == c->pipe1.comp)
- num_buffers_ptr = &c->pipe1.num_buffers;
- else
- num_buffers_ptr = &dummy_num_buffers;
-
- spin_lock_irqsave(&c->fifo_lock, flags);
- if (list_empty(&c->fifo)) {
- spin_unlock_irqrestore(&c->fifo_lock, flags);
- return NULL;
- }
- mbo = list_pop_mbo(&c->fifo);
- --*num_buffers_ptr;
- spin_unlock_irqrestore(&c->fifo_lock, flags);
-
- mbo->num_buffers_ptr = num_buffers_ptr;
- mbo->buffer_length = c->cfg.buffer_size;
- return mbo;
-}
-EXPORT_SYMBOL_GPL(most_get_mbo);
-
-/**
- * most_put_mbo - return buffer to pool
- * @mbo: most buffer
- */
-void most_put_mbo(struct mbo *mbo)
-{
- struct most_channel *c = mbo->context;
-
- if (c->cfg.direction == MOST_CH_TX) {
- arm_mbo(mbo);
- return;
- }
- nq_hdm_mbo(mbo);
- atomic_inc(&c->mbo_nq_level);
-}
-EXPORT_SYMBOL_GPL(most_put_mbo);
-
-/**
- * most_read_completion - read completion handler
- * @mbo: most buffer
- *
- * This function is called by the HDM when data has been received from the
- * hardware and copied to the buffer of the MBO.
- *
- * In case the channel has been poisoned it puts the buffer in the trash queue.
- * Otherwise, it passes the buffer to an component for further processing.
- */
-static void most_read_completion(struct mbo *mbo)
-{
- struct most_channel *c = mbo->context;
-
- if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE))) {
- trash_mbo(mbo);
- return;
- }
-
- if (mbo->status == MBO_E_INVAL) {
- nq_hdm_mbo(mbo);
- atomic_inc(&c->mbo_nq_level);
- return;
- }
-
- if (atomic_sub_and_test(1, &c->mbo_nq_level))
- c->is_starving = 1;
-
- if (c->pipe0.refs && c->pipe0.comp->rx_completion &&
- c->pipe0.comp->rx_completion(mbo) == 0)
- return;
-
- if (c->pipe1.refs && c->pipe1.comp->rx_completion &&
- c->pipe1.comp->rx_completion(mbo) == 0)
- return;
-
- most_put_mbo(mbo);
-}
-
-/**
- * most_start_channel - prepares a channel for communication
- * @iface: pointer to interface instance
- * @id: channel ID
- * @comp: driver component
- *
- * This prepares the channel for usage. Cross-checks whether the
- * channel's been properly configured.
- *
- * Returns 0 on success or error code otherwise.
- */
-int most_start_channel(struct most_interface *iface, int id,
- struct most_component *comp)
-{
- int num_buffer;
- int ret;
- struct most_channel *c = iface->p->channel[id];
-
- if (unlikely(!c))
- return -EINVAL;
-
- mutex_lock(&c->start_mutex);
- if (c->pipe0.refs + c->pipe1.refs > 0)
- goto out; /* already started by another component */
-
- if (!try_module_get(iface->mod)) {
- dev_err(&c->dev, "Failed to acquire HDM lock\n");
- mutex_unlock(&c->start_mutex);
- return -ENOLCK;
- }
-
- c->cfg.extra_len = 0;
- if (c->iface->configure(c->iface, c->channel_id, &c->cfg)) {
- dev_err(&c->dev, "Channel configuration failed. Go check settings...\n");
- ret = -EINVAL;
- goto err_put_module;
- }
-
- init_waitqueue_head(&c->hdm_fifo_wq);
-
- if (c->cfg.direction == MOST_CH_RX)
- num_buffer = arm_mbo_chain(c, c->cfg.direction,
- most_read_completion);
- else
- num_buffer = arm_mbo_chain(c, c->cfg.direction,
- most_write_completion);
- if (unlikely(!num_buffer)) {
- ret = -ENOMEM;
- goto err_put_module;
- }
-
- ret = run_enqueue_thread(c, id);
- if (ret)
- goto err_put_module;
-
- c->is_starving = 0;
- c->pipe0.num_buffers = c->cfg.num_buffers / 2;
- c->pipe1.num_buffers = c->cfg.num_buffers - c->pipe0.num_buffers;
- atomic_set(&c->mbo_ref, num_buffer);
-
-out:
- if (comp == c->pipe0.comp)
- c->pipe0.refs++;
- if (comp == c->pipe1.comp)
- c->pipe1.refs++;
- mutex_unlock(&c->start_mutex);
- return 0;
-
-err_put_module:
- module_put(iface->mod);
- mutex_unlock(&c->start_mutex);
- return ret;
-}
-EXPORT_SYMBOL_GPL(most_start_channel);
-
-/**
- * most_stop_channel - stops a running channel
- * @iface: pointer to interface instance
- * @id: channel ID
- * @comp: driver component
- */
-int most_stop_channel(struct most_interface *iface, int id,
- struct most_component *comp)
-{
- struct most_channel *c;
-
- if (unlikely((!iface) || (id >= iface->num_channels) || (id < 0))) {
- pr_err("Bad interface or index out of range\n");
- return -EINVAL;
- }
- c = iface->p->channel[id];
- if (unlikely(!c))
- return -EINVAL;
-
- mutex_lock(&c->start_mutex);
- if (c->pipe0.refs + c->pipe1.refs >= 2)
- goto out;
-
- if (c->hdm_enqueue_task)
- kthread_stop(c->hdm_enqueue_task);
- c->hdm_enqueue_task = NULL;
-
- if (iface->mod)
- module_put(iface->mod);
-
- c->is_poisoned = true;
- if (c->iface->poison_channel(c->iface, c->channel_id)) {
- dev_err(&c->dev, "Failed to stop channel %d of interface %s\n", c->channel_id,
- c->iface->description);
- mutex_unlock(&c->start_mutex);
- return -EAGAIN;
- }
- flush_trash_fifo(c);
- flush_channel_fifos(c);
-
-#ifdef CMPL_INTERRUPTIBLE
- if (wait_for_completion_interruptible(&c->cleanup)) {
- dev_err(&c->dev, "Interrupted while cleaning up channel %d\n", c->channel_id);
- mutex_unlock(&c->start_mutex);
- return -EINTR;
- }
-#else
- wait_for_completion(&c->cleanup);
-#endif
- c->is_poisoned = false;
-
-out:
- if (comp == c->pipe0.comp)
- c->pipe0.refs--;
- if (comp == c->pipe1.comp)
- c->pipe1.refs--;
- mutex_unlock(&c->start_mutex);
- return 0;
-}
-EXPORT_SYMBOL_GPL(most_stop_channel);
-
-/**
- * most_register_component - registers a driver component with the core
- * @comp: driver component
- */
-int most_register_component(struct most_component *comp)
-{
- if (!comp) {
- pr_err("Bad component\n");
- return -EINVAL;
- }
- list_add_tail(&comp->list, &comp_list);
- return 0;
-}
-EXPORT_SYMBOL_GPL(most_register_component);
-
-static int disconnect_channels(struct device *dev, void *data)
-{
- struct most_interface *iface;
- struct most_channel *c, *tmp;
- struct most_component *comp = data;
-
- iface = dev_get_drvdata(dev);
- list_for_each_entry_safe(c, tmp, &iface->p->channel_list, list) {
- if (c->pipe0.comp == comp || c->pipe1.comp == comp)
- comp->disconnect_channel(c->iface, c->channel_id);
- if (c->pipe0.comp == comp)
- c->pipe0.comp = NULL;
- if (c->pipe1.comp == comp)
- c->pipe1.comp = NULL;
- }
- return 0;
-}
-
-/**
- * most_deregister_component - deregisters a driver component with the core
- * @comp: driver component
- */
-int most_deregister_component(struct most_component *comp)
-{
- if (!comp) {
- pr_err("Bad component\n");
- return -EINVAL;
- }
-
- bus_for_each_dev(&mostbus, NULL, comp, disconnect_channels);
- list_del(&comp->list);
- return 0;
-}
-EXPORT_SYMBOL_GPL(most_deregister_component);
-
-static void release_channel(struct device *dev)
-{
- struct most_channel *c = to_channel(dev);
-
- kfree(c);
-}
-
-/**
- * most_register_interface - registers an interface with core
- * @iface: device interface
- *
- * Allocates and initializes a new interface instance and all of its channels.
- * Returns a pointer to kobject or an error pointer.
- */
-int most_register_interface(struct most_interface *iface)
-{
- unsigned int i;
- int id;
- struct most_channel *c;
-
- if (!iface || !iface->enqueue || !iface->configure ||
- !iface->poison_channel || (iface->num_channels > MAX_CHANNELS)) {
- dev_err(iface->dev, "Bad interface or channel overflow\n");
- return -EINVAL;
- }
-
- id = ida_simple_get(&mdev_id, 0, 0, GFP_KERNEL);
- if (id < 0) {
- dev_err(iface->dev, "Failed to allocate device ID\n");
- return id;
- }
-
- iface->p = kzalloc(sizeof(*iface->p), GFP_KERNEL);
- if (!iface->p) {
- ida_simple_remove(&mdev_id, id);
- return -ENOMEM;
- }
-
- INIT_LIST_HEAD(&iface->p->channel_list);
- iface->p->dev_id = id;
- strscpy(iface->p->name, iface->description, sizeof(iface->p->name));
- iface->dev->bus = &mostbus;
- iface->dev->groups = interface_attr_groups;
- dev_set_drvdata(iface->dev, iface);
- if (device_register(iface->dev)) {
- dev_err(iface->dev, "Failed to register interface device\n");
- kfree(iface->p);
- put_device(iface->dev);
- ida_simple_remove(&mdev_id, id);
- return -ENOMEM;
- }
-
- for (i = 0; i < iface->num_channels; i++) {
- const char *name_suffix = iface->channel_vector[i].name_suffix;
-
- c = kzalloc(sizeof(*c), GFP_KERNEL);
- if (!c)
- goto err_free_resources;
- if (!name_suffix)
- snprintf(c->name, STRING_SIZE, "ch%d", i);
- else
- snprintf(c->name, STRING_SIZE, "%s", name_suffix);
- c->dev.init_name = c->name;
- c->dev.parent = iface->dev;
- c->dev.groups = channel_attr_groups;
- c->dev.release = release_channel;
- iface->p->channel[i] = c;
- c->is_starving = 0;
- c->iface = iface;
- c->channel_id = i;
- c->keep_mbo = false;
- c->enqueue_halt = false;
- c->is_poisoned = false;
- c->cfg.direction = 0;
- c->cfg.data_type = 0;
- c->cfg.num_buffers = 0;
- c->cfg.buffer_size = 0;
- c->cfg.subbuffer_size = 0;
- c->cfg.packets_per_xact = 0;
- spin_lock_init(&c->fifo_lock);
- INIT_LIST_HEAD(&c->fifo);
- INIT_LIST_HEAD(&c->trash_fifo);
- INIT_LIST_HEAD(&c->halt_fifo);
- init_completion(&c->cleanup);
- atomic_set(&c->mbo_ref, 0);
- mutex_init(&c->start_mutex);
- mutex_init(&c->nq_mutex);
- list_add_tail(&c->list, &iface->p->channel_list);
- if (device_register(&c->dev)) {
- dev_err(&c->dev, "Failed to register channel device\n");
- goto err_free_most_channel;
- }
- }
- most_interface_register_notify(iface->description);
- return 0;
-
-err_free_most_channel:
- put_device(&c->dev);
-
-err_free_resources:
- while (i > 0) {
- c = iface->p->channel[--i];
- device_unregister(&c->dev);
- }
- kfree(iface->p);
- device_unregister(iface->dev);
- ida_simple_remove(&mdev_id, id);
- return -ENOMEM;
-}
-EXPORT_SYMBOL_GPL(most_register_interface);
-
-/**
- * most_deregister_interface - deregisters an interface with core
- * @iface: device interface
- *
- * Before removing an interface instance from the list, all running
- * channels are stopped and poisoned.
- */
-void most_deregister_interface(struct most_interface *iface)
-{
- int i;
- struct most_channel *c;
-
- for (i = 0; i < iface->num_channels; i++) {
- c = iface->p->channel[i];
- if (c->pipe0.comp)
- c->pipe0.comp->disconnect_channel(c->iface,
- c->channel_id);
- if (c->pipe1.comp)
- c->pipe1.comp->disconnect_channel(c->iface,
- c->channel_id);
- c->pipe0.comp = NULL;
- c->pipe1.comp = NULL;
- list_del(&c->list);
- device_unregister(&c->dev);
- }
-
- ida_simple_remove(&mdev_id, iface->p->dev_id);
- kfree(iface->p);
- device_unregister(iface->dev);
-}
-EXPORT_SYMBOL_GPL(most_deregister_interface);
-
-/**
- * most_stop_enqueue - prevents core from enqueueing MBOs
- * @iface: pointer to interface
- * @id: channel id
- *
- * This is called by an HDM that _cannot_ attend to its duties and
- * is imminent to get run over by the core. The core is not going to
- * enqueue any further packets unless the flagging HDM calls
- * most_resume enqueue().
- */
-void most_stop_enqueue(struct most_interface *iface, int id)
-{
- struct most_channel *c = iface->p->channel[id];
-
- if (!c)
- return;
-
- mutex_lock(&c->nq_mutex);
- c->enqueue_halt = true;
- mutex_unlock(&c->nq_mutex);
-}
-EXPORT_SYMBOL_GPL(most_stop_enqueue);
-
-/**
- * most_resume_enqueue - allow core to enqueue MBOs again
- * @iface: pointer to interface
- * @id: channel id
- *
- * This clears the enqueue halt flag and enqueues all MBOs currently
- * sitting in the wait fifo.
- */
-void most_resume_enqueue(struct most_interface *iface, int id)
-{
- struct most_channel *c = iface->p->channel[id];
-
- if (!c)
- return;
-
- mutex_lock(&c->nq_mutex);
- c->enqueue_halt = false;
- mutex_unlock(&c->nq_mutex);
-
- wake_up_interruptible(&c->hdm_fifo_wq);
-}
-EXPORT_SYMBOL_GPL(most_resume_enqueue);
-
-static int __init most_init(void)
-{
- int err;
-
- INIT_LIST_HEAD(&comp_list);
- ida_init(&mdev_id);
-
- err = bus_register(&mostbus);
- if (err) {
- pr_err("Failed to register most bus\n");
- return err;
- }
- err = driver_register(&mostbus_driver);
- if (err) {
- pr_err("Failed to register core driver\n");
- goto err_unregister_bus;
- }
- configfs_init();
- return 0;
-
-err_unregister_bus:
- bus_unregister(&mostbus);
- return err;
-}
-
-static void __exit most_exit(void)
-{
- driver_unregister(&mostbus_driver);
- bus_unregister(&mostbus);
- ida_destroy(&mdev_id);
-}
-
-module_init(most_init);
-module_exit(most_exit);
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
-MODULE_DESCRIPTION("Core module of stacked MOST Linux driver");
#include <linux/dma-mapping.h>
#include <linux/sched.h>
#include <linux/kthread.h>
-
-#include "../most.h"
+#include <linux/most.h>
#include "hal.h"
#include "errors.h"
#include "sysfs.h"
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/err.h>
-
-#include "../most.h"
+#include <linux/most.h>
enum { CH_RX, CH_TX, NUM_CHANNELS };
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * most.h - API for component and adapter drivers
- *
- * Copyright (C) 2013-2015, Microchip Technology Germany II GmbH & Co. KG
- */
-
-#ifndef __MOST_CORE_H__
-#define __MOST_CORE_H__
-
-#include <linux/types.h>
-#include <linux/device.h>
-
-struct module;
-struct interface_private;
-
-/**
- * Interface type
- */
-enum most_interface_type {
- ITYPE_LOOPBACK = 1,
- ITYPE_I2C,
- ITYPE_I2S,
- ITYPE_TSI,
- ITYPE_HBI,
- ITYPE_MEDIALB_DIM,
- ITYPE_MEDIALB_DIM2,
- ITYPE_USB,
- ITYPE_PCIE
-};
-
-/**
- * Channel direction.
- */
-enum most_channel_direction {
- MOST_CH_RX = 1 << 0,
- MOST_CH_TX = 1 << 1,
-};
-
-/**
- * Channel data type.
- */
-enum most_channel_data_type {
- MOST_CH_CONTROL = 1 << 0,
- MOST_CH_ASYNC = 1 << 1,
- MOST_CH_ISOC = 1 << 2,
- MOST_CH_SYNC = 1 << 5,
-};
-
-enum most_status_flags {
- /* MBO was processed successfully (data was send or received )*/
- MBO_SUCCESS = 0,
- /* The MBO contains wrong or missing information. */
- MBO_E_INVAL,
- /* MBO was completed as HDM Channel will be closed */
- MBO_E_CLOSE,
-};
-
-/**
- * struct most_channel_capability - Channel capability
- * @direction: Supported channel directions.
- * The value is bitwise OR-combination of the values from the
- * enumeration most_channel_direction. Zero is allowed value and means
- * "channel may not be used".
- * @data_type: Supported channel data types.
- * The value is bitwise OR-combination of the values from the
- * enumeration most_channel_data_type. Zero is allowed value and means
- * "channel may not be used".
- * @num_buffers_packet: Maximum number of buffers supported by this channel
- * for packet data types (Async,Control,QoS)
- * @buffer_size_packet: Maximum buffer size supported by this channel
- * for packet data types (Async,Control,QoS)
- * @num_buffers_streaming: Maximum number of buffers supported by this channel
- * for streaming data types (Sync,AV Packetized)
- * @buffer_size_streaming: Maximum buffer size supported by this channel
- * for streaming data types (Sync,AV Packetized)
- * @name_suffix: Optional suffix providean by an HDM that is attached to the
- * regular channel name.
- *
- * Describes the capabilities of a MOST channel like supported Data Types
- * and directions. This information is provided by an HDM for the MostCore.
- *
- * The Core creates read only sysfs attribute files in
- * /sys/devices/most/mdev#/<channel>/ with the
- * following attributes:
- * -available_directions
- * -available_datatypes
- * -number_of_packet_buffers
- * -number_of_stream_buffers
- * -size_of_packet_buffer
- * -size_of_stream_buffer
- * where content of each file is a string with all supported properties of this
- * very channel attribute.
- */
-struct most_channel_capability {
- u16 direction;
- u16 data_type;
- u16 num_buffers_packet;
- u16 buffer_size_packet;
- u16 num_buffers_streaming;
- u16 buffer_size_streaming;
- const char *name_suffix;
-};
-
-/**
- * struct most_channel_config - stores channel configuration
- * @direction: direction of the channel
- * @data_type: data type travelling over this channel
- * @num_buffers: number of buffers
- * @buffer_size: size of a buffer for AIM.
- * Buffer size may be cutted down by HDM in a configure callback
- * to match to a given interface and channel type.
- * @extra_len: additional buffer space for internal HDM purposes like padding.
- * May be set by HDM in a configure callback if needed.
- * @subbuffer_size: size of a subbuffer
- * @packets_per_xact: number of MOST frames that are packet inside one USB
- * packet. This is USB specific
- *
- * Describes the configuration for a MOST channel. This information is
- * provided from the MostCore to a HDM (like the Medusa PCIe Interface) as a
- * parameter of the "configure" function call.
- */
-struct most_channel_config {
- enum most_channel_direction direction;
- enum most_channel_data_type data_type;
- u16 num_buffers;
- u16 buffer_size;
- u16 extra_len;
- u16 subbuffer_size;
- u16 packets_per_xact;
- u16 dbr_size;
-};
-
-/*
- * struct mbo - MOST Buffer Object.
- * @context: context for core completion handler
- * @priv: private data for HDM
- *
- * public: documented fields that are used for the communications
- * between MostCore and HDMs
- *
- * @list: list head for use by the mbo's current owner
- * @ifp: (in) associated interface instance
- * @num_buffers_ptr: amount of pool buffers
- * @hdm_channel_id: (in) HDM channel instance
- * @virt_address: (in) kernel virtual address of the buffer
- * @bus_address: (in) bus address of the buffer
- * @buffer_length: (in) buffer payload length
- * @processed_length: (out) processed length
- * @status: (out) transfer status
- * @complete: (in) completion routine
- *
- * The core allocates and initializes the MBO.
- *
- * The HDM receives MBO for transfer from the core with the call to enqueue().
- * The HDM copies the data to- or from the buffer depending on configured
- * channel direction, set "processed_length" and "status" and completes
- * the transfer procedure by calling the completion routine.
- *
- * Finally, the MBO is being deallocated or recycled for further
- * transfers of the same or a different HDM.
- *
- * Directions of usage:
- * The core driver should never access any MBO fields (even if marked
- * as "public") while the MBO is owned by an HDM. The ownership starts with
- * the call of enqueue() and ends with the call of its complete() routine.
- *
- * II.
- * Every HDM attached to the core driver _must_ ensure that it returns any MBO
- * it owns (due to a previous call to enqueue() by the core driver) before it
- * de-registers an interface or gets unloaded from the kernel. If this direction
- * is violated memory leaks will occur, since the core driver does _not_ track
- * MBOs it is currently not in control of.
- *
- */
-struct mbo {
- void *context;
- void *priv;
- struct list_head list;
- struct most_interface *ifp;
- int *num_buffers_ptr;
- u16 hdm_channel_id;
- void *virt_address;
- dma_addr_t bus_address;
- u16 buffer_length;
- u16 processed_length;
- enum most_status_flags status;
- void (*complete)(struct mbo *mbo);
-};
-
-/**
- * Interface instance description.
- *
- * Describes an interface of a MOST device the core driver is bound to.
- * This structure is allocated and initialized in the HDM. MostCore may not
- * modify this structure.
- *
- * @dev: the actual device
- * @mod: module
- * @interface Interface type. \sa most_interface_type.
- * @description PRELIMINARY.
- * Unique description of the device instance from point of view of the
- * interface in free text form (ASCII).
- * It may be a hexadecimal presentation of the memory address for the MediaLB
- * IP or USB device ID with USB properties for USB interface, etc.
- * @num_channels Number of channels and size of the channel_vector.
- * @channel_vector Properties of the channels.
- * Array index represents channel ID by the driver.
- * @configure Callback to change data type for the channel of the
- * interface instance. May be zero if the instance of the interface is not
- * configurable. Parameter channel_config describes direction and data
- * type for the channel, configured by the higher level. The content of
- * @enqueue Delivers MBO to the HDM for processing.
- * After HDM completes Rx- or Tx- operation the processed MBO shall
- * be returned back to the MostCore using completion routine.
- * The reason to get the MBO delivered from the MostCore after the channel
- * is poisoned is the re-opening of the channel by the application.
- * In this case the HDM shall hold MBOs and service the channel as usual.
- * The HDM must be able to hold at least one MBO for each channel.
- * The callback returns a negative value on error, otherwise 0.
- * @poison_channel Informs HDM about closing the channel. The HDM shall
- * cancel all transfers and synchronously or asynchronously return
- * all enqueued for this channel MBOs using the completion routine.
- * The callback returns a negative value on error, otherwise 0.
- * @request_netinfo: triggers retrieving of network info from the HDM by
- * means of "Message exchange over MDP/MEP"
- * The call of the function request_netinfo with the parameter on_netinfo as
- * NULL prohibits use of the previously obtained function pointer.
- * @priv Private field used by mostcore to store context information.
- */
-struct most_interface {
- struct device *dev;
- struct device *driver_dev;
- struct module *mod;
- enum most_interface_type interface;
- const char *description;
- unsigned int num_channels;
- struct most_channel_capability *channel_vector;
- void *(*dma_alloc)(struct mbo *mbo, u32 size);
- void (*dma_free)(struct mbo *mbo, u32 size);
- int (*configure)(struct most_interface *iface, int channel_idx,
- struct most_channel_config *channel_config);
- int (*enqueue)(struct most_interface *iface, int channel_idx,
- struct mbo *mbo);
- int (*poison_channel)(struct most_interface *iface, int channel_idx);
- void (*request_netinfo)(struct most_interface *iface, int channel_idx,
- void (*on_netinfo)(struct most_interface *iface,
- unsigned char link_stat,
- unsigned char *mac_addr));
- void *priv;
- struct interface_private *p;
-};
-
-/**
- * struct most_component - identifies a loadable component for the mostcore
- * @list: list_head
- * @name: component name
- * @probe_channel: function for core to notify driver about channel connection
- * @disconnect_channel: callback function to disconnect a certain channel
- * @rx_completion: completion handler for received packets
- * @tx_completion: completion handler for transmitted packets
- */
-struct most_component {
- struct list_head list;
- const char *name;
- struct module *mod;
- int (*probe_channel)(struct most_interface *iface, int channel_idx,
- struct most_channel_config *cfg, char *name,
- char *param);
- int (*disconnect_channel)(struct most_interface *iface,
- int channel_idx);
- int (*rx_completion)(struct mbo *mbo);
- int (*tx_completion)(struct most_interface *iface, int channel_idx);
- int (*cfg_complete)(void);
-};
-
-/**
- * most_register_interface - Registers instance of the interface.
- * @iface: Pointer to the interface instance description.
- *
- * Returns a pointer to the kobject of the generated instance.
- *
- * Note: HDM has to ensure that any reference held on the kobj is
- * released before deregistering the interface.
- */
-int most_register_interface(struct most_interface *iface);
-
-/**
- * Deregisters instance of the interface.
- * @intf_instance Pointer to the interface instance description.
- */
-void most_deregister_interface(struct most_interface *iface);
-void most_submit_mbo(struct mbo *mbo);
-
-/**
- * most_stop_enqueue - prevents core from enqueing MBOs
- * @iface: pointer to interface
- * @channel_idx: channel index
- */
-void most_stop_enqueue(struct most_interface *iface, int channel_idx);
-
-/**
- * most_resume_enqueue - allow core to enqueue MBOs again
- * @iface: pointer to interface
- * @channel_idx: channel index
- *
- * This clears the enqueue halt flag and enqueues all MBOs currently
- * in wait fifo.
- */
-void most_resume_enqueue(struct most_interface *iface, int channel_idx);
-int most_register_component(struct most_component *comp);
-int most_deregister_component(struct most_component *comp);
-struct mbo *most_get_mbo(struct most_interface *iface, int channel_idx,
- struct most_component *comp);
-void most_put_mbo(struct mbo *mbo);
-int channel_has_mbo(struct most_interface *iface, int channel_idx,
- struct most_component *comp);
-int most_start_channel(struct most_interface *iface, int channel_idx,
- struct most_component *comp);
-int most_stop_channel(struct most_interface *iface, int channel_idx,
- struct most_component *comp);
-int __init configfs_init(void);
-int most_register_configfs_subsys(struct most_component *comp);
-void most_deregister_configfs_subsys(struct most_component *comp);
-int most_add_link(char *mdev, char *mdev_ch, char *comp_name, char *link_name,
- char *comp_param);
-int most_remove_link(char *mdev, char *mdev_ch, char *comp_name);
-int most_set_cfg_buffer_size(char *mdev, char *mdev_ch, u16 val);
-int most_set_cfg_subbuffer_size(char *mdev, char *mdev_ch, u16 val);
-int most_set_cfg_dbr_size(char *mdev, char *mdev_ch, u16 val);
-int most_set_cfg_num_buffers(char *mdev, char *mdev_ch, u16 val);
-int most_set_cfg_datatype(char *mdev, char *mdev_ch, char *buf);
-int most_set_cfg_direction(char *mdev, char *mdev_ch, char *buf);
-int most_set_cfg_packets_xact(char *mdev, char *mdev_ch, u16 val);
-int most_cfg_complete(char *comp_name);
-void most_interface_register_notify(const char *mdev_name);
-#endif /* MOST_CORE_H_ */
#include <linux/list.h>
#include <linux/wait.h>
#include <linux/kobject.h>
-
-#include "../most.h"
+#include <linux/most.h>
#define MEP_HDR_LEN 8
#define MDP_HDR_LEN 16
#include <sound/pcm_params.h>
#include <linux/sched.h>
#include <linux/kthread.h>
-
-#include "../most.h"
+#include <linux/most.h>
#define DRIVER_NAME "sound"
#define STRING_SIZE 80
#include <linux/dma-mapping.h>
#include <linux/etherdevice.h>
#include <linux/uaccess.h>
-
-#include "../most.h"
+#include <linux/most.h>
#define USB_MTU 512
#define NO_ISOCHRONOUS_URB 0
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fh.h>
-
-#include "../most.h"
+#include <linux/most.h>
#define V4L2_CMP_MAX_INPUT 1
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * most.h - API for component and adapter drivers
+ *
+ * Copyright (C) 2013-2015, Microchip Technology Germany II GmbH & Co. KG
+ */
+
+#ifndef __MOST_CORE_H__
+#define __MOST_CORE_H__
+
+#include <linux/types.h>
+#include <linux/device.h>
+
+struct module;
+struct interface_private;
+
+/**
+ * Interface type
+ */
+enum most_interface_type {
+ ITYPE_LOOPBACK = 1,
+ ITYPE_I2C,
+ ITYPE_I2S,
+ ITYPE_TSI,
+ ITYPE_HBI,
+ ITYPE_MEDIALB_DIM,
+ ITYPE_MEDIALB_DIM2,
+ ITYPE_USB,
+ ITYPE_PCIE
+};
+
+/**
+ * Channel direction.
+ */
+enum most_channel_direction {
+ MOST_CH_RX = 1 << 0,
+ MOST_CH_TX = 1 << 1,
+};
+
+/**
+ * Channel data type.
+ */
+enum most_channel_data_type {
+ MOST_CH_CONTROL = 1 << 0,
+ MOST_CH_ASYNC = 1 << 1,
+ MOST_CH_ISOC = 1 << 2,
+ MOST_CH_SYNC = 1 << 5,
+};
+
+enum most_status_flags {
+ /* MBO was processed successfully (data was send or received )*/
+ MBO_SUCCESS = 0,
+ /* The MBO contains wrong or missing information. */
+ MBO_E_INVAL,
+ /* MBO was completed as HDM Channel will be closed */
+ MBO_E_CLOSE,
+};
+
+/**
+ * struct most_channel_capability - Channel capability
+ * @direction: Supported channel directions.
+ * The value is bitwise OR-combination of the values from the
+ * enumeration most_channel_direction. Zero is allowed value and means
+ * "channel may not be used".
+ * @data_type: Supported channel data types.
+ * The value is bitwise OR-combination of the values from the
+ * enumeration most_channel_data_type. Zero is allowed value and means
+ * "channel may not be used".
+ * @num_buffers_packet: Maximum number of buffers supported by this channel
+ * for packet data types (Async,Control,QoS)
+ * @buffer_size_packet: Maximum buffer size supported by this channel
+ * for packet data types (Async,Control,QoS)
+ * @num_buffers_streaming: Maximum number of buffers supported by this channel
+ * for streaming data types (Sync,AV Packetized)
+ * @buffer_size_streaming: Maximum buffer size supported by this channel
+ * for streaming data types (Sync,AV Packetized)
+ * @name_suffix: Optional suffix providean by an HDM that is attached to the
+ * regular channel name.
+ *
+ * Describes the capabilities of a MOST channel like supported Data Types
+ * and directions. This information is provided by an HDM for the MostCore.
+ *
+ * The Core creates read only sysfs attribute files in
+ * /sys/devices/most/mdev#/<channel>/ with the
+ * following attributes:
+ * -available_directions
+ * -available_datatypes
+ * -number_of_packet_buffers
+ * -number_of_stream_buffers
+ * -size_of_packet_buffer
+ * -size_of_stream_buffer
+ * where content of each file is a string with all supported properties of this
+ * very channel attribute.
+ */
+struct most_channel_capability {
+ u16 direction;
+ u16 data_type;
+ u16 num_buffers_packet;
+ u16 buffer_size_packet;
+ u16 num_buffers_streaming;
+ u16 buffer_size_streaming;
+ const char *name_suffix;
+};
+
+/**
+ * struct most_channel_config - stores channel configuration
+ * @direction: direction of the channel
+ * @data_type: data type travelling over this channel
+ * @num_buffers: number of buffers
+ * @buffer_size: size of a buffer for AIM.
+ * Buffer size may be cutted down by HDM in a configure callback
+ * to match to a given interface and channel type.
+ * @extra_len: additional buffer space for internal HDM purposes like padding.
+ * May be set by HDM in a configure callback if needed.
+ * @subbuffer_size: size of a subbuffer
+ * @packets_per_xact: number of MOST frames that are packet inside one USB
+ * packet. This is USB specific
+ *
+ * Describes the configuration for a MOST channel. This information is
+ * provided from the MostCore to a HDM (like the Medusa PCIe Interface) as a
+ * parameter of the "configure" function call.
+ */
+struct most_channel_config {
+ enum most_channel_direction direction;
+ enum most_channel_data_type data_type;
+ u16 num_buffers;
+ u16 buffer_size;
+ u16 extra_len;
+ u16 subbuffer_size;
+ u16 packets_per_xact;
+ u16 dbr_size;
+};
+
+/*
+ * struct mbo - MOST Buffer Object.
+ * @context: context for core completion handler
+ * @priv: private data for HDM
+ *
+ * public: documented fields that are used for the communications
+ * between MostCore and HDMs
+ *
+ * @list: list head for use by the mbo's current owner
+ * @ifp: (in) associated interface instance
+ * @num_buffers_ptr: amount of pool buffers
+ * @hdm_channel_id: (in) HDM channel instance
+ * @virt_address: (in) kernel virtual address of the buffer
+ * @bus_address: (in) bus address of the buffer
+ * @buffer_length: (in) buffer payload length
+ * @processed_length: (out) processed length
+ * @status: (out) transfer status
+ * @complete: (in) completion routine
+ *
+ * The core allocates and initializes the MBO.
+ *
+ * The HDM receives MBO for transfer from the core with the call to enqueue().
+ * The HDM copies the data to- or from the buffer depending on configured
+ * channel direction, set "processed_length" and "status" and completes
+ * the transfer procedure by calling the completion routine.
+ *
+ * Finally, the MBO is being deallocated or recycled for further
+ * transfers of the same or a different HDM.
+ *
+ * Directions of usage:
+ * The core driver should never access any MBO fields (even if marked
+ * as "public") while the MBO is owned by an HDM. The ownership starts with
+ * the call of enqueue() and ends with the call of its complete() routine.
+ *
+ * II.
+ * Every HDM attached to the core driver _must_ ensure that it returns any MBO
+ * it owns (due to a previous call to enqueue() by the core driver) before it
+ * de-registers an interface or gets unloaded from the kernel. If this direction
+ * is violated memory leaks will occur, since the core driver does _not_ track
+ * MBOs it is currently not in control of.
+ *
+ */
+struct mbo {
+ void *context;
+ void *priv;
+ struct list_head list;
+ struct most_interface *ifp;
+ int *num_buffers_ptr;
+ u16 hdm_channel_id;
+ void *virt_address;
+ dma_addr_t bus_address;
+ u16 buffer_length;
+ u16 processed_length;
+ enum most_status_flags status;
+ void (*complete)(struct mbo *mbo);
+};
+
+/**
+ * Interface instance description.
+ *
+ * Describes an interface of a MOST device the core driver is bound to.
+ * This structure is allocated and initialized in the HDM. MostCore may not
+ * modify this structure.
+ *
+ * @dev: the actual device
+ * @mod: module
+ * @interface Interface type. \sa most_interface_type.
+ * @description PRELIMINARY.
+ * Unique description of the device instance from point of view of the
+ * interface in free text form (ASCII).
+ * It may be a hexadecimal presentation of the memory address for the MediaLB
+ * IP or USB device ID with USB properties for USB interface, etc.
+ * @num_channels Number of channels and size of the channel_vector.
+ * @channel_vector Properties of the channels.
+ * Array index represents channel ID by the driver.
+ * @configure Callback to change data type for the channel of the
+ * interface instance. May be zero if the instance of the interface is not
+ * configurable. Parameter channel_config describes direction and data
+ * type for the channel, configured by the higher level. The content of
+ * @enqueue Delivers MBO to the HDM for processing.
+ * After HDM completes Rx- or Tx- operation the processed MBO shall
+ * be returned back to the MostCore using completion routine.
+ * The reason to get the MBO delivered from the MostCore after the channel
+ * is poisoned is the re-opening of the channel by the application.
+ * In this case the HDM shall hold MBOs and service the channel as usual.
+ * The HDM must be able to hold at least one MBO for each channel.
+ * The callback returns a negative value on error, otherwise 0.
+ * @poison_channel Informs HDM about closing the channel. The HDM shall
+ * cancel all transfers and synchronously or asynchronously return
+ * all enqueued for this channel MBOs using the completion routine.
+ * The callback returns a negative value on error, otherwise 0.
+ * @request_netinfo: triggers retrieving of network info from the HDM by
+ * means of "Message exchange over MDP/MEP"
+ * The call of the function request_netinfo with the parameter on_netinfo as
+ * NULL prohibits use of the previously obtained function pointer.
+ * @priv Private field used by mostcore to store context information.
+ */
+struct most_interface {
+ struct device *dev;
+ struct device *driver_dev;
+ struct module *mod;
+ enum most_interface_type interface;
+ const char *description;
+ unsigned int num_channels;
+ struct most_channel_capability *channel_vector;
+ void *(*dma_alloc)(struct mbo *mbo, u32 size);
+ void (*dma_free)(struct mbo *mbo, u32 size);
+ int (*configure)(struct most_interface *iface, int channel_idx,
+ struct most_channel_config *channel_config);
+ int (*enqueue)(struct most_interface *iface, int channel_idx,
+ struct mbo *mbo);
+ int (*poison_channel)(struct most_interface *iface, int channel_idx);
+ void (*request_netinfo)(struct most_interface *iface, int channel_idx,
+ void (*on_netinfo)(struct most_interface *iface,
+ unsigned char link_stat,
+ unsigned char *mac_addr));
+ void *priv;
+ struct interface_private *p;
+};
+
+/**
+ * struct most_component - identifies a loadable component for the mostcore
+ * @list: list_head
+ * @name: component name
+ * @probe_channel: function for core to notify driver about channel connection
+ * @disconnect_channel: callback function to disconnect a certain channel
+ * @rx_completion: completion handler for received packets
+ * @tx_completion: completion handler for transmitted packets
+ */
+struct most_component {
+ struct list_head list;
+ const char *name;
+ struct module *mod;
+ int (*probe_channel)(struct most_interface *iface, int channel_idx,
+ struct most_channel_config *cfg, char *name,
+ char *param);
+ int (*disconnect_channel)(struct most_interface *iface,
+ int channel_idx);
+ int (*rx_completion)(struct mbo *mbo);
+ int (*tx_completion)(struct most_interface *iface, int channel_idx);
+ int (*cfg_complete)(void);
+};
+
+/**
+ * most_register_interface - Registers instance of the interface.
+ * @iface: Pointer to the interface instance description.
+ *
+ * Returns a pointer to the kobject of the generated instance.
+ *
+ * Note: HDM has to ensure that any reference held on the kobj is
+ * released before deregistering the interface.
+ */
+int most_register_interface(struct most_interface *iface);
+
+/**
+ * Deregisters instance of the interface.
+ * @intf_instance Pointer to the interface instance description.
+ */
+void most_deregister_interface(struct most_interface *iface);
+void most_submit_mbo(struct mbo *mbo);
+
+/**
+ * most_stop_enqueue - prevents core from enqueing MBOs
+ * @iface: pointer to interface
+ * @channel_idx: channel index
+ */
+void most_stop_enqueue(struct most_interface *iface, int channel_idx);
+
+/**
+ * most_resume_enqueue - allow core to enqueue MBOs again
+ * @iface: pointer to interface
+ * @channel_idx: channel index
+ *
+ * This clears the enqueue halt flag and enqueues all MBOs currently
+ * in wait fifo.
+ */
+void most_resume_enqueue(struct most_interface *iface, int channel_idx);
+int most_register_component(struct most_component *comp);
+int most_deregister_component(struct most_component *comp);
+struct mbo *most_get_mbo(struct most_interface *iface, int channel_idx,
+ struct most_component *comp);
+void most_put_mbo(struct mbo *mbo);
+int channel_has_mbo(struct most_interface *iface, int channel_idx,
+ struct most_component *comp);
+int most_start_channel(struct most_interface *iface, int channel_idx,
+ struct most_component *comp);
+int most_stop_channel(struct most_interface *iface, int channel_idx,
+ struct most_component *comp);
+int __init configfs_init(void);
+int most_register_configfs_subsys(struct most_component *comp);
+void most_deregister_configfs_subsys(struct most_component *comp);
+int most_add_link(char *mdev, char *mdev_ch, char *comp_name, char *link_name,
+ char *comp_param);
+int most_remove_link(char *mdev, char *mdev_ch, char *comp_name);
+int most_set_cfg_buffer_size(char *mdev, char *mdev_ch, u16 val);
+int most_set_cfg_subbuffer_size(char *mdev, char *mdev_ch, u16 val);
+int most_set_cfg_dbr_size(char *mdev, char *mdev_ch, u16 val);
+int most_set_cfg_num_buffers(char *mdev, char *mdev_ch, u16 val);
+int most_set_cfg_datatype(char *mdev, char *mdev_ch, char *buf);
+int most_set_cfg_direction(char *mdev, char *mdev_ch, char *buf);
+int most_set_cfg_packets_xact(char *mdev, char *mdev_ch, u16 val);
+int most_cfg_complete(char *comp_name);
+void most_interface_register_notify(const char *mdev_name);
+#endif /* MOST_CORE_H_ */
projects / linux-2.6-microblaze.git / commitdiff