Move dcdbas to the more appropriate directory drivers/platform/x86.
Signed-off-by: Stuart Hayes <stuart.w.hayes@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
See DIG64_HCDPv20_042804.pdf available from
<http://www.dig64.org/specifications/>
-config DCDBAS
- tristate "Dell Systems Management Base Driver"
- depends on X86
- help
- The Dell Systems Management Base Driver provides a sysfs interface
- for systems management software to perform System Management
- Interrupts (SMIs) and Host Control Actions (system power cycle or
- power off after OS shutdown) on certain Dell systems.
-
- See <file:Documentation/dcdbas.txt> for more details on the driver
- and the Dell systems on which Dell systems management software makes
- use of this driver.
-
- Say Y or M here to enable the driver for use by Dell systems
- management software such as Dell OpenManage.
-
config DMIID
bool "Export DMI identification via sysfs to userspace"
depends on DMI
obj-$(CONFIG_DMI_SYSFS) += dmi-sysfs.o
obj-$(CONFIG_EDD) += edd.o
obj-$(CONFIG_EFI_PCDP) += pcdp.o
-obj-$(CONFIG_DCDBAS) += dcdbas.o
obj-$(CONFIG_DMIID) += dmi-id.o
obj-$(CONFIG_ISCSI_IBFT_FIND) += iscsi_ibft_find.o
obj-$(CONFIG_ISCSI_IBFT) += iscsi_ibft.o
+++ /dev/null
-/*
- * dcdbas.c: Dell Systems Management Base Driver
- *
- * The Dell Systems Management Base Driver provides a sysfs interface for
- * systems management software to perform System Management Interrupts (SMIs)
- * and Host Control Actions (power cycle or power off after OS shutdown) on
- * Dell systems.
- *
- * See Documentation/dcdbas.txt for more information.
- *
- * Copyright (C) 1995-2006 Dell Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License v2.0 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.
- */
-
-#include <linux/platform_device.h>
-#include <linux/acpi.h>
-#include <linux/dma-mapping.h>
-#include <linux/errno.h>
-#include <linux/cpu.h>
-#include <linux/gfp.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/mc146818rtc.h>
-#include <linux/module.h>
-#include <linux/reboot.h>
-#include <linux/sched.h>
-#include <linux/smp.h>
-#include <linux/spinlock.h>
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/mutex.h>
-#include <asm/io.h>
-
-#include "dcdbas.h"
-
-#define DRIVER_NAME "dcdbas"
-#define DRIVER_VERSION "5.6.0-3.3"
-#define DRIVER_DESCRIPTION "Dell Systems Management Base Driver"
-
-static struct platform_device *dcdbas_pdev;
-
-static u8 *smi_data_buf;
-static dma_addr_t smi_data_buf_handle;
-static unsigned long smi_data_buf_size;
-static unsigned long max_smi_data_buf_size = MAX_SMI_DATA_BUF_SIZE;
-static u32 smi_data_buf_phys_addr;
-static DEFINE_MUTEX(smi_data_lock);
-static u8 *eps_buffer;
-
-static unsigned int host_control_action;
-static unsigned int host_control_smi_type;
-static unsigned int host_control_on_shutdown;
-
-static bool wsmt_enabled;
-
-/**
- * smi_data_buf_free: free SMI data buffer
- */
-static void smi_data_buf_free(void)
-{
- if (!smi_data_buf || wsmt_enabled)
- return;
-
- dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
- __func__, smi_data_buf_phys_addr, smi_data_buf_size);
-
- dma_free_coherent(&dcdbas_pdev->dev, smi_data_buf_size, smi_data_buf,
- smi_data_buf_handle);
- smi_data_buf = NULL;
- smi_data_buf_handle = 0;
- smi_data_buf_phys_addr = 0;
- smi_data_buf_size = 0;
-}
-
-/**
- * smi_data_buf_realloc: grow SMI data buffer if needed
- */
-static int smi_data_buf_realloc(unsigned long size)
-{
- void *buf;
- dma_addr_t handle;
-
- if (smi_data_buf_size >= size)
- return 0;
-
- if (size > max_smi_data_buf_size)
- return -EINVAL;
-
- /* new buffer is needed */
- buf = dma_alloc_coherent(&dcdbas_pdev->dev, size, &handle, GFP_KERNEL);
- if (!buf) {
- dev_dbg(&dcdbas_pdev->dev,
- "%s: failed to allocate memory size %lu\n",
- __func__, size);
- return -ENOMEM;
- }
- /* memory zeroed by dma_alloc_coherent */
-
- if (smi_data_buf)
- memcpy(buf, smi_data_buf, smi_data_buf_size);
-
- /* free any existing buffer */
- smi_data_buf_free();
-
- /* set up new buffer for use */
- smi_data_buf = buf;
- smi_data_buf_handle = handle;
- smi_data_buf_phys_addr = (u32) virt_to_phys(buf);
- smi_data_buf_size = size;
-
- dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
- __func__, smi_data_buf_phys_addr, smi_data_buf_size);
-
- return 0;
-}
-
-static ssize_t smi_data_buf_phys_addr_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%x\n", smi_data_buf_phys_addr);
-}
-
-static ssize_t smi_data_buf_size_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%lu\n", smi_data_buf_size);
-}
-
-static ssize_t smi_data_buf_size_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- unsigned long buf_size;
- ssize_t ret;
-
- buf_size = simple_strtoul(buf, NULL, 10);
-
- /* make sure SMI data buffer is at least buf_size */
- mutex_lock(&smi_data_lock);
- ret = smi_data_buf_realloc(buf_size);
- mutex_unlock(&smi_data_lock);
- if (ret)
- return ret;
-
- return count;
-}
-
-static ssize_t smi_data_read(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr,
- char *buf, loff_t pos, size_t count)
-{
- ssize_t ret;
-
- mutex_lock(&smi_data_lock);
- ret = memory_read_from_buffer(buf, count, &pos, smi_data_buf,
- smi_data_buf_size);
- mutex_unlock(&smi_data_lock);
- return ret;
-}
-
-static ssize_t smi_data_write(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr,
- char *buf, loff_t pos, size_t count)
-{
- ssize_t ret;
-
- if ((pos + count) > max_smi_data_buf_size)
- return -EINVAL;
-
- mutex_lock(&smi_data_lock);
-
- ret = smi_data_buf_realloc(pos + count);
- if (ret)
- goto out;
-
- memcpy(smi_data_buf + pos, buf, count);
- ret = count;
-out:
- mutex_unlock(&smi_data_lock);
- return ret;
-}
-
-static ssize_t host_control_action_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%u\n", host_control_action);
-}
-
-static ssize_t host_control_action_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- ssize_t ret;
-
- /* make sure buffer is available for host control command */
- mutex_lock(&smi_data_lock);
- ret = smi_data_buf_realloc(sizeof(struct apm_cmd));
- mutex_unlock(&smi_data_lock);
- if (ret)
- return ret;
-
- host_control_action = simple_strtoul(buf, NULL, 10);
- return count;
-}
-
-static ssize_t host_control_smi_type_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%u\n", host_control_smi_type);
-}
-
-static ssize_t host_control_smi_type_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- host_control_smi_type = simple_strtoul(buf, NULL, 10);
- return count;
-}
-
-static ssize_t host_control_on_shutdown_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%u\n", host_control_on_shutdown);
-}
-
-static ssize_t host_control_on_shutdown_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- host_control_on_shutdown = simple_strtoul(buf, NULL, 10);
- return count;
-}
-
-static int raise_smi(void *par)
-{
- struct smi_cmd *smi_cmd = par;
-
- if (smp_processor_id() != 0) {
- dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
- __func__);
- return -EBUSY;
- }
-
- /* generate SMI */
- /* inb to force posted write through and make SMI happen now */
- asm volatile (
- "outb %b0,%w1\n"
- "inb %w1"
- : /* no output args */
- : "a" (smi_cmd->command_code),
- "d" (smi_cmd->command_address),
- "b" (smi_cmd->ebx),
- "c" (smi_cmd->ecx)
- : "memory"
- );
-
- return 0;
-}
-/**
- * dcdbas_smi_request: generate SMI request
- *
- * Called with smi_data_lock.
- */
-int dcdbas_smi_request(struct smi_cmd *smi_cmd)
-{
- int ret;
-
- if (smi_cmd->magic != SMI_CMD_MAGIC) {
- dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",
- __func__);
- return -EBADR;
- }
-
- /* SMI requires CPU 0 */
- get_online_cpus();
- ret = smp_call_on_cpu(0, raise_smi, smi_cmd, true);
- put_online_cpus();
-
- return ret;
-}
-
-/**
- * smi_request_store:
- *
- * The valid values are:
- * 0: zero SMI data buffer
- * 1: generate calling interface SMI
- * 2: generate raw SMI
- *
- * User application writes smi_cmd to smi_data before telling driver
- * to generate SMI.
- */
-static ssize_t smi_request_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct smi_cmd *smi_cmd;
- unsigned long val = simple_strtoul(buf, NULL, 10);
- ssize_t ret;
-
- mutex_lock(&smi_data_lock);
-
- if (smi_data_buf_size < sizeof(struct smi_cmd)) {
- ret = -ENODEV;
- goto out;
- }
- smi_cmd = (struct smi_cmd *)smi_data_buf;
-
- switch (val) {
- case 2:
- /* Raw SMI */
- ret = dcdbas_smi_request(smi_cmd);
- if (!ret)
- ret = count;
- break;
- case 1:
- /*
- * Calling Interface SMI
- *
- * Provide physical address of command buffer field within
- * the struct smi_cmd to BIOS.
- *
- * Because the address that smi_cmd (smi_data_buf) points to
- * will be from memremap() of a non-memory address if WSMT
- * is present, we can't use virt_to_phys() on smi_cmd, so
- * we have to use the physical address that was saved when
- * the virtual address for smi_cmd was received.
- */
- smi_cmd->ebx = smi_data_buf_phys_addr +
- offsetof(struct smi_cmd, command_buffer);
- ret = dcdbas_smi_request(smi_cmd);
- if (!ret)
- ret = count;
- break;
- case 0:
- memset(smi_data_buf, 0, smi_data_buf_size);
- ret = count;
- break;
- default:
- ret = -EINVAL;
- break;
- }
-
-out:
- mutex_unlock(&smi_data_lock);
- return ret;
-}
-EXPORT_SYMBOL(dcdbas_smi_request);
-
-/**
- * host_control_smi: generate host control SMI
- *
- * Caller must set up the host control command in smi_data_buf.
- */
-static int host_control_smi(void)
-{
- struct apm_cmd *apm_cmd;
- u8 *data;
- unsigned long flags;
- u32 num_ticks;
- s8 cmd_status;
- u8 index;
-
- apm_cmd = (struct apm_cmd *)smi_data_buf;
- apm_cmd->status = ESM_STATUS_CMD_UNSUCCESSFUL;
-
- switch (host_control_smi_type) {
- case HC_SMITYPE_TYPE1:
- spin_lock_irqsave(&rtc_lock, flags);
- /* write SMI data buffer physical address */
- data = (u8 *)&smi_data_buf_phys_addr;
- for (index = PE1300_CMOS_CMD_STRUCT_PTR;
- index < (PE1300_CMOS_CMD_STRUCT_PTR + 4);
- index++, data++) {
- outb(index,
- (CMOS_BASE_PORT + CMOS_PAGE2_INDEX_PORT_PIIX4));
- outb(*data,
- (CMOS_BASE_PORT + CMOS_PAGE2_DATA_PORT_PIIX4));
- }
-
- /* first set status to -1 as called by spec */
- cmd_status = ESM_STATUS_CMD_UNSUCCESSFUL;
- outb((u8) cmd_status, PCAT_APM_STATUS_PORT);
-
- /* generate SMM call */
- outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
- spin_unlock_irqrestore(&rtc_lock, flags);
-
- /* wait a few to see if it executed */
- num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
- while ((cmd_status = inb(PCAT_APM_STATUS_PORT))
- == ESM_STATUS_CMD_UNSUCCESSFUL) {
- num_ticks--;
- if (num_ticks == EXPIRED_TIMER)
- return -ETIME;
- }
- break;
-
- case HC_SMITYPE_TYPE2:
- case HC_SMITYPE_TYPE3:
- spin_lock_irqsave(&rtc_lock, flags);
- /* write SMI data buffer physical address */
- data = (u8 *)&smi_data_buf_phys_addr;
- for (index = PE1400_CMOS_CMD_STRUCT_PTR;
- index < (PE1400_CMOS_CMD_STRUCT_PTR + 4);
- index++, data++) {
- outb(index, (CMOS_BASE_PORT + CMOS_PAGE1_INDEX_PORT));
- outb(*data, (CMOS_BASE_PORT + CMOS_PAGE1_DATA_PORT));
- }
-
- /* generate SMM call */
- if (host_control_smi_type == HC_SMITYPE_TYPE3)
- outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
- else
- outb(ESM_APM_CMD, PE1400_APM_CONTROL_PORT);
-
- /* restore RTC index pointer since it was written to above */
- CMOS_READ(RTC_REG_C);
- spin_unlock_irqrestore(&rtc_lock, flags);
-
- /* read control port back to serialize write */
- cmd_status = inb(PE1400_APM_CONTROL_PORT);
-
- /* wait a few to see if it executed */
- num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
- while (apm_cmd->status == ESM_STATUS_CMD_UNSUCCESSFUL) {
- num_ticks--;
- if (num_ticks == EXPIRED_TIMER)
- return -ETIME;
- }
- break;
-
- default:
- dev_dbg(&dcdbas_pdev->dev, "%s: invalid SMI type %u\n",
- __func__, host_control_smi_type);
- return -ENOSYS;
- }
-
- return 0;
-}
-
-/**
- * dcdbas_host_control: initiate host control
- *
- * This function is called by the driver after the system has
- * finished shutting down if the user application specified a
- * host control action to perform on shutdown. It is safe to
- * use smi_data_buf at this point because the system has finished
- * shutting down and no userspace apps are running.
- */
-static void dcdbas_host_control(void)
-{
- struct apm_cmd *apm_cmd;
- u8 action;
-
- if (host_control_action == HC_ACTION_NONE)
- return;
-
- action = host_control_action;
- host_control_action = HC_ACTION_NONE;
-
- if (!smi_data_buf) {
- dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __func__);
- return;
- }
-
- if (smi_data_buf_size < sizeof(struct apm_cmd)) {
- dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n",
- __func__);
- return;
- }
-
- apm_cmd = (struct apm_cmd *)smi_data_buf;
-
- /* power off takes precedence */
- if (action & HC_ACTION_HOST_CONTROL_POWEROFF) {
- apm_cmd->command = ESM_APM_POWER_CYCLE;
- apm_cmd->reserved = 0;
- *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 0;
- host_control_smi();
- } else if (action & HC_ACTION_HOST_CONTROL_POWERCYCLE) {
- apm_cmd->command = ESM_APM_POWER_CYCLE;
- apm_cmd->reserved = 0;
- *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 20;
- host_control_smi();
- }
-}
-
-/* WSMT */
-
-static u8 checksum(u8 *buffer, u8 length)
-{
- u8 sum = 0;
- u8 *end = buffer + length;
-
- while (buffer < end)
- sum += *buffer++;
- return sum;
-}
-
-static inline struct smm_eps_table *check_eps_table(u8 *addr)
-{
- struct smm_eps_table *eps = (struct smm_eps_table *)addr;
-
- if (strncmp(eps->smm_comm_buff_anchor, SMM_EPS_SIG, 4) != 0)
- return NULL;
-
- if (checksum(addr, eps->length) != 0)
- return NULL;
-
- return eps;
-}
-
-static int dcdbas_check_wsmt(void)
-{
- struct acpi_table_wsmt *wsmt = NULL;
- struct smm_eps_table *eps = NULL;
- u64 remap_size;
- u8 *addr;
-
- acpi_get_table(ACPI_SIG_WSMT, 0, (struct acpi_table_header **)&wsmt);
- if (!wsmt)
- return 0;
-
- /* Check if WSMT ACPI table shows that protection is enabled */
- if (!(wsmt->protection_flags & ACPI_WSMT_FIXED_COMM_BUFFERS) ||
- !(wsmt->protection_flags & ACPI_WSMT_COMM_BUFFER_NESTED_PTR_PROTECTION))
- return 0;
-
- /* Scan for EPS (entry point structure) */
- for (addr = (u8 *)__va(0xf0000);
- addr < (u8 *)__va(0x100000 - sizeof(struct smm_eps_table));
- addr += 16) {
- eps = check_eps_table(addr);
- if (eps)
- break;
- }
-
- if (!eps) {
- dev_dbg(&dcdbas_pdev->dev, "found WSMT, but no EPS found\n");
- return -ENODEV;
- }
-
- /*
- * Get physical address of buffer and map to virtual address.
- * Table gives size in 4K pages, regardless of actual system page size.
- */
- if (upper_32_bits(eps->smm_comm_buff_addr + 8)) {
- dev_warn(&dcdbas_pdev->dev, "found WSMT, but EPS buffer address is above 4GB\n");
- return -EINVAL;
- }
- /*
- * Limit remap size to MAX_SMI_DATA_BUF_SIZE + 8 (since the first 8
- * bytes are used for a semaphore, not the data buffer itself).
- */
- remap_size = eps->num_of_4k_pages * PAGE_SIZE;
- if (remap_size > MAX_SMI_DATA_BUF_SIZE + 8)
- remap_size = MAX_SMI_DATA_BUF_SIZE + 8;
- eps_buffer = memremap(eps->smm_comm_buff_addr, remap_size, MEMREMAP_WB);
- if (!eps_buffer) {
- dev_warn(&dcdbas_pdev->dev, "found WSMT, but failed to map EPS buffer\n");
- return -ENOMEM;
- }
-
- /* First 8 bytes is for a semaphore, not part of the smi_data_buf */
- smi_data_buf_phys_addr = eps->smm_comm_buff_addr + 8;
- smi_data_buf = eps_buffer + 8;
- smi_data_buf_size = remap_size - 8;
- max_smi_data_buf_size = smi_data_buf_size;
- wsmt_enabled = true;
- dev_info(&dcdbas_pdev->dev,
- "WSMT found, using firmware-provided SMI buffer.\n");
- return 1;
-}
-
-/**
- * dcdbas_reboot_notify: handle reboot notification for host control
- */
-static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code,
- void *unused)
-{
- switch (code) {
- case SYS_DOWN:
- case SYS_HALT:
- case SYS_POWER_OFF:
- if (host_control_on_shutdown) {
- /* firmware is going to perform host control action */
- printk(KERN_WARNING "Please wait for shutdown "
- "action to complete...\n");
- dcdbas_host_control();
- }
- break;
- }
-
- return NOTIFY_DONE;
-}
-
-static struct notifier_block dcdbas_reboot_nb = {
- .notifier_call = dcdbas_reboot_notify,
- .next = NULL,
- .priority = INT_MIN
-};
-
-static DCDBAS_BIN_ATTR_RW(smi_data);
-
-static struct bin_attribute *dcdbas_bin_attrs[] = {
- &bin_attr_smi_data,
- NULL
-};
-
-static DCDBAS_DEV_ATTR_RW(smi_data_buf_size);
-static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr);
-static DCDBAS_DEV_ATTR_WO(smi_request);
-static DCDBAS_DEV_ATTR_RW(host_control_action);
-static DCDBAS_DEV_ATTR_RW(host_control_smi_type);
-static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown);
-
-static struct attribute *dcdbas_dev_attrs[] = {
- &dev_attr_smi_data_buf_size.attr,
- &dev_attr_smi_data_buf_phys_addr.attr,
- &dev_attr_smi_request.attr,
- &dev_attr_host_control_action.attr,
- &dev_attr_host_control_smi_type.attr,
- &dev_attr_host_control_on_shutdown.attr,
- NULL
-};
-
-static const struct attribute_group dcdbas_attr_group = {
- .attrs = dcdbas_dev_attrs,
- .bin_attrs = dcdbas_bin_attrs,
-};
-
-static int dcdbas_probe(struct platform_device *dev)
-{
- int error;
-
- host_control_action = HC_ACTION_NONE;
- host_control_smi_type = HC_SMITYPE_NONE;
-
- dcdbas_pdev = dev;
-
- /* Check if ACPI WSMT table specifies protected SMI buffer address */
- error = dcdbas_check_wsmt();
- if (error < 0)
- return error;
-
- /*
- * BIOS SMI calls require buffer addresses be in 32-bit address space.
- * This is done by setting the DMA mask below.
- */
- error = dma_set_coherent_mask(&dcdbas_pdev->dev, DMA_BIT_MASK(32));
- if (error)
- return error;
-
- error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);
- if (error)
- return error;
-
- register_reboot_notifier(&dcdbas_reboot_nb);
-
- dev_info(&dev->dev, "%s (version %s)\n",
- DRIVER_DESCRIPTION, DRIVER_VERSION);
-
- return 0;
-}
-
-static int dcdbas_remove(struct platform_device *dev)
-{
- unregister_reboot_notifier(&dcdbas_reboot_nb);
- sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
-
- return 0;
-}
-
-static struct platform_driver dcdbas_driver = {
- .driver = {
- .name = DRIVER_NAME,
- },
- .probe = dcdbas_probe,
- .remove = dcdbas_remove,
-};
-
-static const struct platform_device_info dcdbas_dev_info __initconst = {
- .name = DRIVER_NAME,
- .id = -1,
- .dma_mask = DMA_BIT_MASK(32),
-};
-
-static struct platform_device *dcdbas_pdev_reg;
-
-/**
- * dcdbas_init: initialize driver
- */
-static int __init dcdbas_init(void)
-{
- int error;
-
- error = platform_driver_register(&dcdbas_driver);
- if (error)
- return error;
-
- dcdbas_pdev_reg = platform_device_register_full(&dcdbas_dev_info);
- if (IS_ERR(dcdbas_pdev_reg)) {
- error = PTR_ERR(dcdbas_pdev_reg);
- goto err_unregister_driver;
- }
-
- return 0;
-
- err_unregister_driver:
- platform_driver_unregister(&dcdbas_driver);
- return error;
-}
-
-/**
- * dcdbas_exit: perform driver cleanup
- */
-static void __exit dcdbas_exit(void)
-{
- /*
- * make sure functions that use dcdbas_pdev are called
- * before platform_device_unregister
- */
- unregister_reboot_notifier(&dcdbas_reboot_nb);
-
- /*
- * We have to free the buffer here instead of dcdbas_remove
- * because only in module exit function we can be sure that
- * all sysfs attributes belonging to this module have been
- * released.
- */
- if (dcdbas_pdev)
- smi_data_buf_free();
- if (eps_buffer)
- memunmap(eps_buffer);
- platform_device_unregister(dcdbas_pdev_reg);
- platform_driver_unregister(&dcdbas_driver);
-}
-
-subsys_initcall_sync(dcdbas_init);
-module_exit(dcdbas_exit);
-
-MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")");
-MODULE_VERSION(DRIVER_VERSION);
-MODULE_AUTHOR("Dell Inc.");
-MODULE_LICENSE("GPL");
-/* Any System or BIOS claiming to be by Dell */
-MODULE_ALIAS("dmi:*:[bs]vnD[Ee][Ll][Ll]*:*");
+++ /dev/null
-/*
- * dcdbas.h: Definitions for Dell Systems Management Base driver
- *
- * Copyright (C) 1995-2005 Dell Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License v2.0 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.
- */
-
-#ifndef _DCDBAS_H_
-#define _DCDBAS_H_
-
-#include <linux/device.h>
-#include <linux/sysfs.h>
-#include <linux/types.h>
-
-#define MAX_SMI_DATA_BUF_SIZE (256 * 1024)
-
-#define HC_ACTION_NONE (0)
-#define HC_ACTION_HOST_CONTROL_POWEROFF BIT(1)
-#define HC_ACTION_HOST_CONTROL_POWERCYCLE BIT(2)
-
-#define HC_SMITYPE_NONE (0)
-#define HC_SMITYPE_TYPE1 (1)
-#define HC_SMITYPE_TYPE2 (2)
-#define HC_SMITYPE_TYPE3 (3)
-
-#define ESM_APM_CMD (0x0A0)
-#define ESM_APM_POWER_CYCLE (0x10)
-#define ESM_STATUS_CMD_UNSUCCESSFUL (-1)
-
-#define CMOS_BASE_PORT (0x070)
-#define CMOS_PAGE1_INDEX_PORT (0)
-#define CMOS_PAGE1_DATA_PORT (1)
-#define CMOS_PAGE2_INDEX_PORT_PIIX4 (2)
-#define CMOS_PAGE2_DATA_PORT_PIIX4 (3)
-#define PE1400_APM_CONTROL_PORT (0x0B0)
-#define PCAT_APM_CONTROL_PORT (0x0B2)
-#define PCAT_APM_STATUS_PORT (0x0B3)
-#define PE1300_CMOS_CMD_STRUCT_PTR (0x38)
-#define PE1400_CMOS_CMD_STRUCT_PTR (0x70)
-
-#define MAX_SYSMGMT_SHORTCMD_PARMBUF_LEN (14)
-#define MAX_SYSMGMT_LONGCMD_SGENTRY_NUM (16)
-
-#define TIMEOUT_USEC_SHORT_SEMA_BLOCKING (10000)
-#define EXPIRED_TIMER (0)
-
-#define SMI_CMD_MAGIC (0x534D4931)
-#define SMM_EPS_SIG "$SCB"
-
-#define DCDBAS_DEV_ATTR_RW(_name) \
- DEVICE_ATTR(_name,0600,_name##_show,_name##_store);
-
-#define DCDBAS_DEV_ATTR_RO(_name) \
- DEVICE_ATTR(_name,0400,_name##_show,NULL);
-
-#define DCDBAS_DEV_ATTR_WO(_name) \
- DEVICE_ATTR(_name,0200,NULL,_name##_store);
-
-#define DCDBAS_BIN_ATTR_RW(_name) \
-struct bin_attribute bin_attr_##_name = { \
- .attr = { .name = __stringify(_name), \
- .mode = 0600 }, \
- .read = _name##_read, \
- .write = _name##_write, \
-}
-
-struct smi_cmd {
- __u32 magic;
- __u32 ebx;
- __u32 ecx;
- __u16 command_address;
- __u8 command_code;
- __u8 reserved;
- __u8 command_buffer[1];
-} __attribute__ ((packed));
-
-struct apm_cmd {
- __u8 command;
- __s8 status;
- __u16 reserved;
- union {
- struct {
- __u8 parm[MAX_SYSMGMT_SHORTCMD_PARMBUF_LEN];
- } __attribute__ ((packed)) shortreq;
-
- struct {
- __u16 num_sg_entries;
- struct {
- __u32 size;
- __u64 addr;
- } __attribute__ ((packed))
- sglist[MAX_SYSMGMT_LONGCMD_SGENTRY_NUM];
- } __attribute__ ((packed)) longreq;
- } __attribute__ ((packed)) parameters;
-} __attribute__ ((packed));
-
-int dcdbas_smi_request(struct smi_cmd *smi_cmd);
-
-struct smm_eps_table {
- char smm_comm_buff_anchor[4];
- u8 length;
- u8 checksum;
- u8 version;
- u64 smm_comm_buff_addr;
- u64 num_of_4k_pages;
-} __packed;
-
-#endif /* _DCDBAS_H_ */
-
If you have an ACPI-compatible ASUS laptop, say Y or M here.
+config DCDBAS
+ tristate "Dell Systems Management Base Driver"
+ depends on X86
+ help
+ The Dell Systems Management Base Driver provides a sysfs interface
+ for systems management software to perform System Management
+ Interrupts (SMIs) and Host Control Actions (system power cycle or
+ power off after OS shutdown) on certain Dell systems.
+
+ See <file:Documentation/dcdbas.txt> for more details on the driver
+ and the Dell systems on which Dell systems management software makes
+ use of this driver.
+
+ Say Y or M here to enable the driver for use by Dell systems
+ management software such as Dell OpenManage.
+
#
# The DELL_SMBIOS driver depends on ACPI_WMI and/or DCDBAS if those
# backends are selected. The "depends" line prevents a configuration
obj-$(CONFIG_MSI_LAPTOP) += msi-laptop.o
obj-$(CONFIG_ACPI_CMPC) += classmate-laptop.o
obj-$(CONFIG_COMPAL_LAPTOP) += compal-laptop.o
+obj-$(CONFIG_DCDBAS) += dcdbas.o
obj-$(CONFIG_DELL_SMBIOS) += dell-smbios.o
dell-smbios-objs := dell-smbios-base.o
dell-smbios-$(CONFIG_DELL_SMBIOS_WMI) += dell-smbios-wmi.o
--- /dev/null
+/*
+ * dcdbas.c: Dell Systems Management Base Driver
+ *
+ * The Dell Systems Management Base Driver provides a sysfs interface for
+ * systems management software to perform System Management Interrupts (SMIs)
+ * and Host Control Actions (power cycle or power off after OS shutdown) on
+ * Dell systems.
+ *
+ * See Documentation/dcdbas.txt for more information.
+ *
+ * Copyright (C) 1995-2006 Dell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License v2.0 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.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/acpi.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <linux/cpu.h>
+#include <linux/gfp.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mc146818rtc.h>
+#include <linux/module.h>
+#include <linux/reboot.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <asm/io.h>
+
+#include "dcdbas.h"
+
+#define DRIVER_NAME "dcdbas"
+#define DRIVER_VERSION "5.6.0-3.3"
+#define DRIVER_DESCRIPTION "Dell Systems Management Base Driver"
+
+static struct platform_device *dcdbas_pdev;
+
+static u8 *smi_data_buf;
+static dma_addr_t smi_data_buf_handle;
+static unsigned long smi_data_buf_size;
+static unsigned long max_smi_data_buf_size = MAX_SMI_DATA_BUF_SIZE;
+static u32 smi_data_buf_phys_addr;
+static DEFINE_MUTEX(smi_data_lock);
+static u8 *eps_buffer;
+
+static unsigned int host_control_action;
+static unsigned int host_control_smi_type;
+static unsigned int host_control_on_shutdown;
+
+static bool wsmt_enabled;
+
+/**
+ * smi_data_buf_free: free SMI data buffer
+ */
+static void smi_data_buf_free(void)
+{
+ if (!smi_data_buf || wsmt_enabled)
+ return;
+
+ dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
+ __func__, smi_data_buf_phys_addr, smi_data_buf_size);
+
+ dma_free_coherent(&dcdbas_pdev->dev, smi_data_buf_size, smi_data_buf,
+ smi_data_buf_handle);
+ smi_data_buf = NULL;
+ smi_data_buf_handle = 0;
+ smi_data_buf_phys_addr = 0;
+ smi_data_buf_size = 0;
+}
+
+/**
+ * smi_data_buf_realloc: grow SMI data buffer if needed
+ */
+static int smi_data_buf_realloc(unsigned long size)
+{
+ void *buf;
+ dma_addr_t handle;
+
+ if (smi_data_buf_size >= size)
+ return 0;
+
+ if (size > max_smi_data_buf_size)
+ return -EINVAL;
+
+ /* new buffer is needed */
+ buf = dma_alloc_coherent(&dcdbas_pdev->dev, size, &handle, GFP_KERNEL);
+ if (!buf) {
+ dev_dbg(&dcdbas_pdev->dev,
+ "%s: failed to allocate memory size %lu\n",
+ __func__, size);
+ return -ENOMEM;
+ }
+ /* memory zeroed by dma_alloc_coherent */
+
+ if (smi_data_buf)
+ memcpy(buf, smi_data_buf, smi_data_buf_size);
+
+ /* free any existing buffer */
+ smi_data_buf_free();
+
+ /* set up new buffer for use */
+ smi_data_buf = buf;
+ smi_data_buf_handle = handle;
+ smi_data_buf_phys_addr = (u32) virt_to_phys(buf);
+ smi_data_buf_size = size;
+
+ dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
+ __func__, smi_data_buf_phys_addr, smi_data_buf_size);
+
+ return 0;
+}
+
+static ssize_t smi_data_buf_phys_addr_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%x\n", smi_data_buf_phys_addr);
+}
+
+static ssize_t smi_data_buf_size_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%lu\n", smi_data_buf_size);
+}
+
+static ssize_t smi_data_buf_size_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long buf_size;
+ ssize_t ret;
+
+ buf_size = simple_strtoul(buf, NULL, 10);
+
+ /* make sure SMI data buffer is at least buf_size */
+ mutex_lock(&smi_data_lock);
+ ret = smi_data_buf_realloc(buf_size);
+ mutex_unlock(&smi_data_lock);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static ssize_t smi_data_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t pos, size_t count)
+{
+ ssize_t ret;
+
+ mutex_lock(&smi_data_lock);
+ ret = memory_read_from_buffer(buf, count, &pos, smi_data_buf,
+ smi_data_buf_size);
+ mutex_unlock(&smi_data_lock);
+ return ret;
+}
+
+static ssize_t smi_data_write(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t pos, size_t count)
+{
+ ssize_t ret;
+
+ if ((pos + count) > max_smi_data_buf_size)
+ return -EINVAL;
+
+ mutex_lock(&smi_data_lock);
+
+ ret = smi_data_buf_realloc(pos + count);
+ if (ret)
+ goto out;
+
+ memcpy(smi_data_buf + pos, buf, count);
+ ret = count;
+out:
+ mutex_unlock(&smi_data_lock);
+ return ret;
+}
+
+static ssize_t host_control_action_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%u\n", host_control_action);
+}
+
+static ssize_t host_control_action_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ ssize_t ret;
+
+ /* make sure buffer is available for host control command */
+ mutex_lock(&smi_data_lock);
+ ret = smi_data_buf_realloc(sizeof(struct apm_cmd));
+ mutex_unlock(&smi_data_lock);
+ if (ret)
+ return ret;
+
+ host_control_action = simple_strtoul(buf, NULL, 10);
+ return count;
+}
+
+static ssize_t host_control_smi_type_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%u\n", host_control_smi_type);
+}
+
+static ssize_t host_control_smi_type_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ host_control_smi_type = simple_strtoul(buf, NULL, 10);
+ return count;
+}
+
+static ssize_t host_control_on_shutdown_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%u\n", host_control_on_shutdown);
+}
+
+static ssize_t host_control_on_shutdown_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ host_control_on_shutdown = simple_strtoul(buf, NULL, 10);
+ return count;
+}
+
+static int raise_smi(void *par)
+{
+ struct smi_cmd *smi_cmd = par;
+
+ if (smp_processor_id() != 0) {
+ dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
+ __func__);
+ return -EBUSY;
+ }
+
+ /* generate SMI */
+ /* inb to force posted write through and make SMI happen now */
+ asm volatile (
+ "outb %b0,%w1\n"
+ "inb %w1"
+ : /* no output args */
+ : "a" (smi_cmd->command_code),
+ "d" (smi_cmd->command_address),
+ "b" (smi_cmd->ebx),
+ "c" (smi_cmd->ecx)
+ : "memory"
+ );
+
+ return 0;
+}
+/**
+ * dcdbas_smi_request: generate SMI request
+ *
+ * Called with smi_data_lock.
+ */
+int dcdbas_smi_request(struct smi_cmd *smi_cmd)
+{
+ int ret;
+
+ if (smi_cmd->magic != SMI_CMD_MAGIC) {
+ dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",
+ __func__);
+ return -EBADR;
+ }
+
+ /* SMI requires CPU 0 */
+ get_online_cpus();
+ ret = smp_call_on_cpu(0, raise_smi, smi_cmd, true);
+ put_online_cpus();
+
+ return ret;
+}
+
+/**
+ * smi_request_store:
+ *
+ * The valid values are:
+ * 0: zero SMI data buffer
+ * 1: generate calling interface SMI
+ * 2: generate raw SMI
+ *
+ * User application writes smi_cmd to smi_data before telling driver
+ * to generate SMI.
+ */
+static ssize_t smi_request_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct smi_cmd *smi_cmd;
+ unsigned long val = simple_strtoul(buf, NULL, 10);
+ ssize_t ret;
+
+ mutex_lock(&smi_data_lock);
+
+ if (smi_data_buf_size < sizeof(struct smi_cmd)) {
+ ret = -ENODEV;
+ goto out;
+ }
+ smi_cmd = (struct smi_cmd *)smi_data_buf;
+
+ switch (val) {
+ case 2:
+ /* Raw SMI */
+ ret = dcdbas_smi_request(smi_cmd);
+ if (!ret)
+ ret = count;
+ break;
+ case 1:
+ /*
+ * Calling Interface SMI
+ *
+ * Provide physical address of command buffer field within
+ * the struct smi_cmd to BIOS.
+ *
+ * Because the address that smi_cmd (smi_data_buf) points to
+ * will be from memremap() of a non-memory address if WSMT
+ * is present, we can't use virt_to_phys() on smi_cmd, so
+ * we have to use the physical address that was saved when
+ * the virtual address for smi_cmd was received.
+ */
+ smi_cmd->ebx = smi_data_buf_phys_addr +
+ offsetof(struct smi_cmd, command_buffer);
+ ret = dcdbas_smi_request(smi_cmd);
+ if (!ret)
+ ret = count;
+ break;
+ case 0:
+ memset(smi_data_buf, 0, smi_data_buf_size);
+ ret = count;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+out:
+ mutex_unlock(&smi_data_lock);
+ return ret;
+}
+EXPORT_SYMBOL(dcdbas_smi_request);
+
+/**
+ * host_control_smi: generate host control SMI
+ *
+ * Caller must set up the host control command in smi_data_buf.
+ */
+static int host_control_smi(void)
+{
+ struct apm_cmd *apm_cmd;
+ u8 *data;
+ unsigned long flags;
+ u32 num_ticks;
+ s8 cmd_status;
+ u8 index;
+
+ apm_cmd = (struct apm_cmd *)smi_data_buf;
+ apm_cmd->status = ESM_STATUS_CMD_UNSUCCESSFUL;
+
+ switch (host_control_smi_type) {
+ case HC_SMITYPE_TYPE1:
+ spin_lock_irqsave(&rtc_lock, flags);
+ /* write SMI data buffer physical address */
+ data = (u8 *)&smi_data_buf_phys_addr;
+ for (index = PE1300_CMOS_CMD_STRUCT_PTR;
+ index < (PE1300_CMOS_CMD_STRUCT_PTR + 4);
+ index++, data++) {
+ outb(index,
+ (CMOS_BASE_PORT + CMOS_PAGE2_INDEX_PORT_PIIX4));
+ outb(*data,
+ (CMOS_BASE_PORT + CMOS_PAGE2_DATA_PORT_PIIX4));
+ }
+
+ /* first set status to -1 as called by spec */
+ cmd_status = ESM_STATUS_CMD_UNSUCCESSFUL;
+ outb((u8) cmd_status, PCAT_APM_STATUS_PORT);
+
+ /* generate SMM call */
+ outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
+ spin_unlock_irqrestore(&rtc_lock, flags);
+
+ /* wait a few to see if it executed */
+ num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
+ while ((cmd_status = inb(PCAT_APM_STATUS_PORT))
+ == ESM_STATUS_CMD_UNSUCCESSFUL) {
+ num_ticks--;
+ if (num_ticks == EXPIRED_TIMER)
+ return -ETIME;
+ }
+ break;
+
+ case HC_SMITYPE_TYPE2:
+ case HC_SMITYPE_TYPE3:
+ spin_lock_irqsave(&rtc_lock, flags);
+ /* write SMI data buffer physical address */
+ data = (u8 *)&smi_data_buf_phys_addr;
+ for (index = PE1400_CMOS_CMD_STRUCT_PTR;
+ index < (PE1400_CMOS_CMD_STRUCT_PTR + 4);
+ index++, data++) {
+ outb(index, (CMOS_BASE_PORT + CMOS_PAGE1_INDEX_PORT));
+ outb(*data, (CMOS_BASE_PORT + CMOS_PAGE1_DATA_PORT));
+ }
+
+ /* generate SMM call */
+ if (host_control_smi_type == HC_SMITYPE_TYPE3)
+ outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
+ else
+ outb(ESM_APM_CMD, PE1400_APM_CONTROL_PORT);
+
+ /* restore RTC index pointer since it was written to above */
+ CMOS_READ(RTC_REG_C);
+ spin_unlock_irqrestore(&rtc_lock, flags);
+
+ /* read control port back to serialize write */
+ cmd_status = inb(PE1400_APM_CONTROL_PORT);
+
+ /* wait a few to see if it executed */
+ num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
+ while (apm_cmd->status == ESM_STATUS_CMD_UNSUCCESSFUL) {
+ num_ticks--;
+ if (num_ticks == EXPIRED_TIMER)
+ return -ETIME;
+ }
+ break;
+
+ default:
+ dev_dbg(&dcdbas_pdev->dev, "%s: invalid SMI type %u\n",
+ __func__, host_control_smi_type);
+ return -ENOSYS;
+ }
+
+ return 0;
+}
+
+/**
+ * dcdbas_host_control: initiate host control
+ *
+ * This function is called by the driver after the system has
+ * finished shutting down if the user application specified a
+ * host control action to perform on shutdown. It is safe to
+ * use smi_data_buf at this point because the system has finished
+ * shutting down and no userspace apps are running.
+ */
+static void dcdbas_host_control(void)
+{
+ struct apm_cmd *apm_cmd;
+ u8 action;
+
+ if (host_control_action == HC_ACTION_NONE)
+ return;
+
+ action = host_control_action;
+ host_control_action = HC_ACTION_NONE;
+
+ if (!smi_data_buf) {
+ dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __func__);
+ return;
+ }
+
+ if (smi_data_buf_size < sizeof(struct apm_cmd)) {
+ dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n",
+ __func__);
+ return;
+ }
+
+ apm_cmd = (struct apm_cmd *)smi_data_buf;
+
+ /* power off takes precedence */
+ if (action & HC_ACTION_HOST_CONTROL_POWEROFF) {
+ apm_cmd->command = ESM_APM_POWER_CYCLE;
+ apm_cmd->reserved = 0;
+ *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 0;
+ host_control_smi();
+ } else if (action & HC_ACTION_HOST_CONTROL_POWERCYCLE) {
+ apm_cmd->command = ESM_APM_POWER_CYCLE;
+ apm_cmd->reserved = 0;
+ *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 20;
+ host_control_smi();
+ }
+}
+
+/* WSMT */
+
+static u8 checksum(u8 *buffer, u8 length)
+{
+ u8 sum = 0;
+ u8 *end = buffer + length;
+
+ while (buffer < end)
+ sum += *buffer++;
+ return sum;
+}
+
+static inline struct smm_eps_table *check_eps_table(u8 *addr)
+{
+ struct smm_eps_table *eps = (struct smm_eps_table *)addr;
+
+ if (strncmp(eps->smm_comm_buff_anchor, SMM_EPS_SIG, 4) != 0)
+ return NULL;
+
+ if (checksum(addr, eps->length) != 0)
+ return NULL;
+
+ return eps;
+}
+
+static int dcdbas_check_wsmt(void)
+{
+ struct acpi_table_wsmt *wsmt = NULL;
+ struct smm_eps_table *eps = NULL;
+ u64 remap_size;
+ u8 *addr;
+
+ acpi_get_table(ACPI_SIG_WSMT, 0, (struct acpi_table_header **)&wsmt);
+ if (!wsmt)
+ return 0;
+
+ /* Check if WSMT ACPI table shows that protection is enabled */
+ if (!(wsmt->protection_flags & ACPI_WSMT_FIXED_COMM_BUFFERS) ||
+ !(wsmt->protection_flags & ACPI_WSMT_COMM_BUFFER_NESTED_PTR_PROTECTION))
+ return 0;
+
+ /* Scan for EPS (entry point structure) */
+ for (addr = (u8 *)__va(0xf0000);
+ addr < (u8 *)__va(0x100000 - sizeof(struct smm_eps_table));
+ addr += 16) {
+ eps = check_eps_table(addr);
+ if (eps)
+ break;
+ }
+
+ if (!eps) {
+ dev_dbg(&dcdbas_pdev->dev, "found WSMT, but no EPS found\n");
+ return -ENODEV;
+ }
+
+ /*
+ * Get physical address of buffer and map to virtual address.
+ * Table gives size in 4K pages, regardless of actual system page size.
+ */
+ if (upper_32_bits(eps->smm_comm_buff_addr + 8)) {
+ dev_warn(&dcdbas_pdev->dev, "found WSMT, but EPS buffer address is above 4GB\n");
+ return -EINVAL;
+ }
+ /*
+ * Limit remap size to MAX_SMI_DATA_BUF_SIZE + 8 (since the first 8
+ * bytes are used for a semaphore, not the data buffer itself).
+ */
+ remap_size = eps->num_of_4k_pages * PAGE_SIZE;
+ if (remap_size > MAX_SMI_DATA_BUF_SIZE + 8)
+ remap_size = MAX_SMI_DATA_BUF_SIZE + 8;
+ eps_buffer = memremap(eps->smm_comm_buff_addr, remap_size, MEMREMAP_WB);
+ if (!eps_buffer) {
+ dev_warn(&dcdbas_pdev->dev, "found WSMT, but failed to map EPS buffer\n");
+ return -ENOMEM;
+ }
+
+ /* First 8 bytes is for a semaphore, not part of the smi_data_buf */
+ smi_data_buf_phys_addr = eps->smm_comm_buff_addr + 8;
+ smi_data_buf = eps_buffer + 8;
+ smi_data_buf_size = remap_size - 8;
+ max_smi_data_buf_size = smi_data_buf_size;
+ wsmt_enabled = true;
+ dev_info(&dcdbas_pdev->dev,
+ "WSMT found, using firmware-provided SMI buffer.\n");
+ return 1;
+}
+
+/**
+ * dcdbas_reboot_notify: handle reboot notification for host control
+ */
+static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code,
+ void *unused)
+{
+ switch (code) {
+ case SYS_DOWN:
+ case SYS_HALT:
+ case SYS_POWER_OFF:
+ if (host_control_on_shutdown) {
+ /* firmware is going to perform host control action */
+ printk(KERN_WARNING "Please wait for shutdown "
+ "action to complete...\n");
+ dcdbas_host_control();
+ }
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block dcdbas_reboot_nb = {
+ .notifier_call = dcdbas_reboot_notify,
+ .next = NULL,
+ .priority = INT_MIN
+};
+
+static DCDBAS_BIN_ATTR_RW(smi_data);
+
+static struct bin_attribute *dcdbas_bin_attrs[] = {
+ &bin_attr_smi_data,
+ NULL
+};
+
+static DCDBAS_DEV_ATTR_RW(smi_data_buf_size);
+static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr);
+static DCDBAS_DEV_ATTR_WO(smi_request);
+static DCDBAS_DEV_ATTR_RW(host_control_action);
+static DCDBAS_DEV_ATTR_RW(host_control_smi_type);
+static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown);
+
+static struct attribute *dcdbas_dev_attrs[] = {
+ &dev_attr_smi_data_buf_size.attr,
+ &dev_attr_smi_data_buf_phys_addr.attr,
+ &dev_attr_smi_request.attr,
+ &dev_attr_host_control_action.attr,
+ &dev_attr_host_control_smi_type.attr,
+ &dev_attr_host_control_on_shutdown.attr,
+ NULL
+};
+
+static const struct attribute_group dcdbas_attr_group = {
+ .attrs = dcdbas_dev_attrs,
+ .bin_attrs = dcdbas_bin_attrs,
+};
+
+static int dcdbas_probe(struct platform_device *dev)
+{
+ int error;
+
+ host_control_action = HC_ACTION_NONE;
+ host_control_smi_type = HC_SMITYPE_NONE;
+
+ dcdbas_pdev = dev;
+
+ /* Check if ACPI WSMT table specifies protected SMI buffer address */
+ error = dcdbas_check_wsmt();
+ if (error < 0)
+ return error;
+
+ /*
+ * BIOS SMI calls require buffer addresses be in 32-bit address space.
+ * This is done by setting the DMA mask below.
+ */
+ error = dma_set_coherent_mask(&dcdbas_pdev->dev, DMA_BIT_MASK(32));
+ if (error)
+ return error;
+
+ error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);
+ if (error)
+ return error;
+
+ register_reboot_notifier(&dcdbas_reboot_nb);
+
+ dev_info(&dev->dev, "%s (version %s)\n",
+ DRIVER_DESCRIPTION, DRIVER_VERSION);
+
+ return 0;
+}
+
+static int dcdbas_remove(struct platform_device *dev)
+{
+ unregister_reboot_notifier(&dcdbas_reboot_nb);
+ sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
+
+ return 0;
+}
+
+static struct platform_driver dcdbas_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+ .probe = dcdbas_probe,
+ .remove = dcdbas_remove,
+};
+
+static const struct platform_device_info dcdbas_dev_info __initconst = {
+ .name = DRIVER_NAME,
+ .id = -1,
+ .dma_mask = DMA_BIT_MASK(32),
+};
+
+static struct platform_device *dcdbas_pdev_reg;
+
+/**
+ * dcdbas_init: initialize driver
+ */
+static int __init dcdbas_init(void)
+{
+ int error;
+
+ error = platform_driver_register(&dcdbas_driver);
+ if (error)
+ return error;
+
+ dcdbas_pdev_reg = platform_device_register_full(&dcdbas_dev_info);
+ if (IS_ERR(dcdbas_pdev_reg)) {
+ error = PTR_ERR(dcdbas_pdev_reg);
+ goto err_unregister_driver;
+ }
+
+ return 0;
+
+ err_unregister_driver:
+ platform_driver_unregister(&dcdbas_driver);
+ return error;
+}
+
+/**
+ * dcdbas_exit: perform driver cleanup
+ */
+static void __exit dcdbas_exit(void)
+{
+ /*
+ * make sure functions that use dcdbas_pdev are called
+ * before platform_device_unregister
+ */
+ unregister_reboot_notifier(&dcdbas_reboot_nb);
+
+ /*
+ * We have to free the buffer here instead of dcdbas_remove
+ * because only in module exit function we can be sure that
+ * all sysfs attributes belonging to this module have been
+ * released.
+ */
+ if (dcdbas_pdev)
+ smi_data_buf_free();
+ if (eps_buffer)
+ memunmap(eps_buffer);
+ platform_device_unregister(dcdbas_pdev_reg);
+ platform_driver_unregister(&dcdbas_driver);
+}
+
+subsys_initcall_sync(dcdbas_init);
+module_exit(dcdbas_exit);
+
+MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")");
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_AUTHOR("Dell Inc.");
+MODULE_LICENSE("GPL");
+/* Any System or BIOS claiming to be by Dell */
+MODULE_ALIAS("dmi:*:[bs]vnD[Ee][Ll][Ll]*:*");
--- /dev/null
+/*
+ * dcdbas.h: Definitions for Dell Systems Management Base driver
+ *
+ * Copyright (C) 1995-2005 Dell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License v2.0 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.
+ */
+
+#ifndef _DCDBAS_H_
+#define _DCDBAS_H_
+
+#include <linux/device.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+
+#define MAX_SMI_DATA_BUF_SIZE (256 * 1024)
+
+#define HC_ACTION_NONE (0)
+#define HC_ACTION_HOST_CONTROL_POWEROFF BIT(1)
+#define HC_ACTION_HOST_CONTROL_POWERCYCLE BIT(2)
+
+#define HC_SMITYPE_NONE (0)
+#define HC_SMITYPE_TYPE1 (1)
+#define HC_SMITYPE_TYPE2 (2)
+#define HC_SMITYPE_TYPE3 (3)
+
+#define ESM_APM_CMD (0x0A0)
+#define ESM_APM_POWER_CYCLE (0x10)
+#define ESM_STATUS_CMD_UNSUCCESSFUL (-1)
+
+#define CMOS_BASE_PORT (0x070)
+#define CMOS_PAGE1_INDEX_PORT (0)
+#define CMOS_PAGE1_DATA_PORT (1)
+#define CMOS_PAGE2_INDEX_PORT_PIIX4 (2)
+#define CMOS_PAGE2_DATA_PORT_PIIX4 (3)
+#define PE1400_APM_CONTROL_PORT (0x0B0)
+#define PCAT_APM_CONTROL_PORT (0x0B2)
+#define PCAT_APM_STATUS_PORT (0x0B3)
+#define PE1300_CMOS_CMD_STRUCT_PTR (0x38)
+#define PE1400_CMOS_CMD_STRUCT_PTR (0x70)
+
+#define MAX_SYSMGMT_SHORTCMD_PARMBUF_LEN (14)
+#define MAX_SYSMGMT_LONGCMD_SGENTRY_NUM (16)
+
+#define TIMEOUT_USEC_SHORT_SEMA_BLOCKING (10000)
+#define EXPIRED_TIMER (0)
+
+#define SMI_CMD_MAGIC (0x534D4931)
+#define SMM_EPS_SIG "$SCB"
+
+#define DCDBAS_DEV_ATTR_RW(_name) \
+ DEVICE_ATTR(_name,0600,_name##_show,_name##_store);
+
+#define DCDBAS_DEV_ATTR_RO(_name) \
+ DEVICE_ATTR(_name,0400,_name##_show,NULL);
+
+#define DCDBAS_DEV_ATTR_WO(_name) \
+ DEVICE_ATTR(_name,0200,NULL,_name##_store);
+
+#define DCDBAS_BIN_ATTR_RW(_name) \
+struct bin_attribute bin_attr_##_name = { \
+ .attr = { .name = __stringify(_name), \
+ .mode = 0600 }, \
+ .read = _name##_read, \
+ .write = _name##_write, \
+}
+
+struct smi_cmd {
+ __u32 magic;
+ __u32 ebx;
+ __u32 ecx;
+ __u16 command_address;
+ __u8 command_code;
+ __u8 reserved;
+ __u8 command_buffer[1];
+} __attribute__ ((packed));
+
+struct apm_cmd {
+ __u8 command;
+ __s8 status;
+ __u16 reserved;
+ union {
+ struct {
+ __u8 parm[MAX_SYSMGMT_SHORTCMD_PARMBUF_LEN];
+ } __attribute__ ((packed)) shortreq;
+
+ struct {
+ __u16 num_sg_entries;
+ struct {
+ __u32 size;
+ __u64 addr;
+ } __attribute__ ((packed))
+ sglist[MAX_SYSMGMT_LONGCMD_SGENTRY_NUM];
+ } __attribute__ ((packed)) longreq;
+ } __attribute__ ((packed)) parameters;
+} __attribute__ ((packed));
+
+int dcdbas_smi_request(struct smi_cmd *smi_cmd);
+
+struct smm_eps_table {
+ char smm_comm_buff_anchor[4];
+ u8 length;
+ u8 checksum;
+ u8 version;
+ u64 smm_comm_buff_addr;
+ u64 num_of_4k_pages;
+} __packed;
+
+#endif /* _DCDBAS_H_ */
+
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
-#include "../../firmware/dcdbas.h"
+#include "dcdbas.h"
#include "dell-smbios.h"
static int da_command_address;
projects / linux-2.6-microblaze.git / commitdiff