--- /dev/null
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ * Intel MIC Bus driver.
+ *
+ * This implementation is very similar to the the virtio bus driver
+ * implementation @ drivers/virtio/virtio.c
+ */
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/idr.h>
+#include <linux/mic_bus.h>
+
+/* Unique numbering for mbus devices. */
+static DEFINE_IDA(mbus_index_ida);
+
+static ssize_t device_show(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ struct mbus_device *dev = dev_to_mbus(d);
+ return sprintf(buf, "0x%04x\n", dev->id.device);
+}
+static DEVICE_ATTR_RO(device);
+
+static ssize_t vendor_show(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ struct mbus_device *dev = dev_to_mbus(d);
+ return sprintf(buf, "0x%04x\n", dev->id.vendor);
+}
+static DEVICE_ATTR_RO(vendor);
+
+static ssize_t modalias_show(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ struct mbus_device *dev = dev_to_mbus(d);
+ return sprintf(buf, "mbus:d%08Xv%08X\n",
+ dev->id.device, dev->id.vendor);
+}
+static DEVICE_ATTR_RO(modalias);
+
+static struct attribute *mbus_dev_attrs[] = {
+ &dev_attr_device.attr,
+ &dev_attr_vendor.attr,
+ &dev_attr_modalias.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(mbus_dev);
+
+static inline int mbus_id_match(const struct mbus_device *dev,
+ const struct mbus_device_id *id)
+{
+ if (id->device != dev->id.device && id->device != MBUS_DEV_ANY_ID)
+ return 0;
+
+ return id->vendor == MBUS_DEV_ANY_ID || id->vendor == dev->id.vendor;
+}
+
+/*
+ * This looks through all the IDs a driver claims to support. If any of them
+ * match, we return 1 and the kernel will call mbus_dev_probe().
+ */
+static int mbus_dev_match(struct device *dv, struct device_driver *dr)
+{
+ unsigned int i;
+ struct mbus_device *dev = dev_to_mbus(dv);
+ const struct mbus_device_id *ids;
+
+ ids = drv_to_mbus(dr)->id_table;
+ for (i = 0; ids[i].device; i++)
+ if (mbus_id_match(dev, &ids[i]))
+ return 1;
+ return 0;
+}
+
+static int mbus_uevent(struct device *dv, struct kobj_uevent_env *env)
+{
+ struct mbus_device *dev = dev_to_mbus(dv);
+
+ return add_uevent_var(env, "MODALIAS=mbus:d%08Xv%08X",
+ dev->id.device, dev->id.vendor);
+}
+
+static int mbus_dev_probe(struct device *d)
+{
+ int err;
+ struct mbus_device *dev = dev_to_mbus(d);
+ struct mbus_driver *drv = drv_to_mbus(dev->dev.driver);
+
+ err = drv->probe(dev);
+ if (!err)
+ if (drv->scan)
+ drv->scan(dev);
+ return err;
+}
+
+static int mbus_dev_remove(struct device *d)
+{
+ struct mbus_device *dev = dev_to_mbus(d);
+ struct mbus_driver *drv = drv_to_mbus(dev->dev.driver);
+
+ drv->remove(dev);
+ return 0;
+}
+
+static struct bus_type mic_bus = {
+ .name = "mic_bus",
+ .match = mbus_dev_match,
+ .dev_groups = mbus_dev_groups,
+ .uevent = mbus_uevent,
+ .probe = mbus_dev_probe,
+ .remove = mbus_dev_remove,
+};
+
+int mbus_register_driver(struct mbus_driver *driver)
+{
+ driver->driver.bus = &mic_bus;
+ return driver_register(&driver->driver);
+}
+EXPORT_SYMBOL_GPL(mbus_register_driver);
+
+void mbus_unregister_driver(struct mbus_driver *driver)
+{
+ driver_unregister(&driver->driver);
+}
+EXPORT_SYMBOL_GPL(mbus_unregister_driver);
+
+static void mbus_release_dev(struct device *d)
+{
+ struct mbus_device *mbdev = dev_to_mbus(d);
+ kfree(mbdev);
+}
+
+struct mbus_device *
+mbus_register_device(struct device *pdev, int id, struct dma_map_ops *dma_ops,
+ struct mbus_hw_ops *hw_ops, void __iomem *mmio_va)
+{
+ int ret;
+ struct mbus_device *mbdev;
+
+ mbdev = kzalloc(sizeof(*mbdev), GFP_KERNEL);
+ if (!mbdev)
+ return ERR_PTR(-ENOMEM);
+
+ mbdev->mmio_va = mmio_va;
+ mbdev->dev.parent = pdev;
+ mbdev->id.device = id;
+ mbdev->id.vendor = MBUS_DEV_ANY_ID;
+ mbdev->dev.archdata.dma_ops = dma_ops;
+ mbdev->dev.dma_mask = &mbdev->dev.coherent_dma_mask;
+ dma_set_mask(&mbdev->dev, DMA_BIT_MASK(64));
+ mbdev->dev.release = mbus_release_dev;
+ mbdev->hw_ops = hw_ops;
+ mbdev->dev.bus = &mic_bus;
+
+ /* Assign a unique device index and hence name. */
+ ret = ida_simple_get(&mbus_index_ida, 0, 0, GFP_KERNEL);
+ if (ret < 0)
+ goto free_mbdev;
+
+ mbdev->index = ret;
+ dev_set_name(&mbdev->dev, "mbus-dev%u", mbdev->index);
+ /*
+ * device_register() causes the bus infrastructure to look for a
+ * matching driver.
+ */
+ ret = device_register(&mbdev->dev);
+ if (ret)
+ goto ida_remove;
+ return mbdev;
+ida_remove:
+ ida_simple_remove(&mbus_index_ida, mbdev->index);
+free_mbdev:
+ kfree(mbdev);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(mbus_register_device);
+
+void mbus_unregister_device(struct mbus_device *mbdev)
+{
+ int index = mbdev->index; /* save for after device release */
+
+ device_unregister(&mbdev->dev);
+ ida_simple_remove(&mbus_index_ida, index);
+}
+EXPORT_SYMBOL_GPL(mbus_unregister_device);
+
+static int __init mbus_init(void)
+{
+ return bus_register(&mic_bus);
+}
+
+static void __exit mbus_exit(void)
+{
+ bus_unregister(&mic_bus);
+ ida_destroy(&mbus_index_ida);
+}
+
+core_initcall(mbus_init);
+module_exit(mbus_exit);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("Intel(R) MIC Bus driver");
+MODULE_LICENSE("GPL v2");
--- /dev/null
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ * Intel MIC Bus driver.
+ *
+ * This implementation is very similar to the the virtio bus driver
+ * implementation @ include/linux/virtio.h.
+ */
+#ifndef _MIC_BUS_H_
+#define _MIC_BUS_H_
+/*
+ * Everything a mbus driver needs to work with any particular mbus
+ * implementation.
+ */
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+
+struct mbus_device_id {
+ __u32 device;
+ __u32 vendor;
+};
+
+#define MBUS_DEV_DMA_HOST 2
+#define MBUS_DEV_DMA_MIC 3
+#define MBUS_DEV_ANY_ID 0xffffffff
+
+/**
+ * mbus_device - representation of a device using mbus
+ * @mmio_va: virtual address of mmio space
+ * @hw_ops: the hardware ops supported by this device.
+ * @id: the device type identification (used to match it with a driver).
+ * @dev: underlying device.
+ * be used to communicate with.
+ * @index: unique position on the mbus bus
+ */
+struct mbus_device {
+ void __iomem *mmio_va;
+ struct mbus_hw_ops *hw_ops;
+ struct mbus_device_id id;
+ struct device dev;
+ int index;
+};
+
+/**
+ * mbus_driver - operations for a mbus I/O driver
+ * @driver: underlying device driver (populate name and owner).
+ * @id_table: the ids serviced by this driver.
+ * @probe: the function to call when a device is found. Returns 0 or -errno.
+ * @remove: the function to call when a device is removed.
+ */
+struct mbus_driver {
+ struct device_driver driver;
+ const struct mbus_device_id *id_table;
+ int (*probe)(struct mbus_device *dev);
+ void (*scan)(struct mbus_device *dev);
+ void (*remove)(struct mbus_device *dev);
+};
+
+/**
+ * struct mic_irq - opaque pointer used as cookie
+ */
+struct mic_irq;
+
+/**
+ * mbus_hw_ops - Hardware operations for accessing a MIC device on the MIC bus.
+ */
+struct mbus_hw_ops {
+ struct mic_irq* (*request_threaded_irq)(struct mbus_device *mbdev,
+ irq_handler_t handler,
+ irq_handler_t thread_fn,
+ const char *name, void *data,
+ int intr_src);
+ void (*free_irq)(struct mbus_device *mbdev,
+ struct mic_irq *cookie, void *data);
+ void (*ack_interrupt)(struct mbus_device *mbdev, int num);
+};
+
+struct mbus_device *
+mbus_register_device(struct device *pdev, int id, struct dma_map_ops *dma_ops,
+ struct mbus_hw_ops *hw_ops, void __iomem *mmio_va);
+void mbus_unregister_device(struct mbus_device *mbdev);
+
+int mbus_register_driver(struct mbus_driver *drv);
+void mbus_unregister_driver(struct mbus_driver *drv);
+
+static inline struct mbus_device *dev_to_mbus(struct device *_dev)
+{
+ return container_of(_dev, struct mbus_device, dev);
+}
+
+static inline struct mbus_driver *drv_to_mbus(struct device_driver *drv)
+{
+ return container_of(drv, struct mbus_driver, driver);
+}
+
+#endif /* _MIC_BUS_H */
projects / linux-2.6-microblaze.git / commitdiff