Merge /spare/repo/linux-2.6/

5 files changed, 1366 insertions, 0 deletions

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 5b29c3b2a331..327b58e64875 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -58,4 +58,31 @@ config EFI_PCDP
 
           See <http://www.dig64.org/specifications/DIG64_HCDPv20_042804.pdf>
 
+config DELL_RBU
+        tristate "BIOS update support for DELL systems via sysfs"
+        select FW_LOADER
+        help
+         Say m if you want to have the option of updating the BIOS for your
+         DELL system. Note you need a Dell OpenManage or Dell Update package (DUP)
+         supporting application to comunicate with the BIOS regarding the new
+         image for the image update to take effect.
+         See <file:Documentation/dell_rbu.txt> for more details on the driver.
+
+config DCDBAS
+        tristate "Dell Systems Management Base Driver"
+        depends on X86 || X86_64
+        default m
+        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.
+
 endmenu
diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile
index 90fd0b26db8b..85429979d0db 100644
--- a/drivers/firmware/Makefile
+++ b/drivers/firmware/Makefile
@@ -4,3 +4,5 @@
 obj-$(CONFIG_EDD)               += edd.o
 obj-$(CONFIG_EFI_VARS)          += efivars.o
 obj-$(CONFIG_EFI_PCDP)          += pcdp.o
+obj-$(CONFIG_DELL_RBU)          += dell_rbu.o
+obj-$(CONFIG_DCDBAS)            += dcdbas.o
diff --git a/drivers/firmware/dcdbas.c b/drivers/firmware/dcdbas.c
new file mode 100644
index 000000000000..955537fe9958
--- /dev/null
+++ b/drivers/firmware/dcdbas.c
@@ -0,0 +1,596 @@
+/*
+ *  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) 1995-2005 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.
+ */
+
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.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 <asm/io.h>
+#include <asm/semaphore.h>
+
+#include "dcdbas.h"
+
+#define DRIVER_NAME             "dcdbas"
+#define DRIVER_VERSION          "5.6.0-1"
+#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 u32 smi_data_buf_phys_addr;
+static DECLARE_MUTEX(smi_data_lock);
+
+static unsigned int host_control_action;
+static unsigned int host_control_smi_type;
+static unsigned int host_control_on_shutdown;
+
+/**
+ * smi_data_buf_free: free SMI data buffer
+ */
+static void smi_data_buf_free(void)
+{
+        if (!smi_data_buf)
+                return;
+
+        dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
+                __FUNCTION__, 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",
+                        __FUNCTION__, 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",
+                __FUNCTION__, 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 */
+        down(&smi_data_lock);
+        ret = smi_data_buf_realloc(buf_size);
+        up(&smi_data_lock);
+        if (ret)
+                return ret;
+
+        return count;
+}
+
+static ssize_t smi_data_read(struct kobject *kobj, char *buf, loff_t pos,
+                             size_t count)
+{
+        size_t max_read;
+        ssize_t ret;
+
+        down(&smi_data_lock);
+
+        if (pos >= smi_data_buf_size) {
+                ret = 0;
+                goto out;
+        }
+
+        max_read = smi_data_buf_size - pos;
+        ret = min(max_read, count);
+        memcpy(buf, smi_data_buf + pos, ret);
+out:
+        up(&smi_data_lock);
+        return ret;
+}
+
+static ssize_t smi_data_write(struct kobject *kobj, char *buf, loff_t pos,
+                              size_t count)
+{
+        ssize_t ret;
+
+        down(&smi_data_lock);
+
+        ret = smi_data_buf_realloc(pos + count);
+        if (ret)
+                goto out;
+
+        memcpy(smi_data_buf + pos, buf, count);
+        ret = count;
+out:
+        up(&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 */
+        down(&smi_data_lock);
+        ret = smi_data_buf_realloc(sizeof(struct apm_cmd));
+        up(&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;
+}
+
+/**
+ * smi_request: generate SMI request
+ *
+ * Called with smi_data_lock.
+ */
+static int smi_request(struct smi_cmd *smi_cmd)
+{
+        cpumask_t old_mask;
+        int ret = 0;
+
+        if (smi_cmd->magic != SMI_CMD_MAGIC) {
+                dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",
+                         __FUNCTION__);
+                return -EBADR;
+        }
+
+        /* SMI requires CPU 0 */
+        old_mask = current->cpus_allowed;
+        set_cpus_allowed(current, cpumask_of_cpu(0));
+        if (smp_processor_id() != 0) {
+                dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
+                        __FUNCTION__);
+                ret = -EBUSY;
+                goto out;
+        }
+
+        /* generate SMI */
+        asm volatile (
+                "outb %b0,%w1"
+                : /* no output args */
+                : "a" (smi_cmd->command_code),
+                  "d" (smi_cmd->command_address),
+                  "b" (smi_cmd->ebx),
+                  "c" (smi_cmd->ecx)
+                : "memory"
+        );
+
+out:
+        set_cpus_allowed(current, old_mask);
+        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;
+
+        down(&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 = smi_request(smi_cmd);
+                if (!ret)
+                        ret = count;
+                break;
+        case 1:
+                /* Calling Interface SMI */
+                smi_cmd->ebx = (u32) virt_to_phys(smi_cmd->command_buffer);
+                ret = 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:
+        up(&smi_data_lock);
+        return ret;
+}
+
+/**
+ * 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",
+                        __FUNCTION__, 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", __FUNCTION__);
+                return;
+        }
+
+        if (smi_data_buf_size < sizeof(struct apm_cmd)) {
+                dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n",
+                        __FUNCTION__);
+                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();
+        }
+}
+
+/**
+ * dcdbas_reboot_notify: handle reboot notification for host control
+ */
+static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code,
+                                void *unused)
+{
+        static unsigned int notify_cnt = 0;
+
+        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 */
+                        if (++notify_cnt == 2) {
+                                printk(KERN_WARNING
+                                       "Please wait for shutdown "
+                                       "action to complete...\n");
+                                dcdbas_host_control();
+                        }
+                        /*
+                         * register again and initiate the host control
+                         * action on the second notification to allow
+                         * everyone that registered to be notified
+                         */
+                        register_reboot_notifier(nb);
+                }
+                break;
+        }
+
+        return NOTIFY_DONE;
+}
+
+static struct notifier_block dcdbas_reboot_nb = {
+        .notifier_call = dcdbas_reboot_notify,
+        .next = NULL,
+        .priority = 0
+};
+
+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 device_attribute *dcdbas_dev_attrs[] = {
+        &dev_attr_smi_data_buf_size,
+        &dev_attr_smi_data_buf_phys_addr,
+        &dev_attr_smi_request,
+        &dev_attr_host_control_action,
+        &dev_attr_host_control_smi_type,
+        &dev_attr_host_control_on_shutdown,
+        NULL
+};
+
+/**
+ * dcdbas_init: initialize driver
+ */
+static int __init dcdbas_init(void)
+{
+        int i;
+
+        host_control_action = HC_ACTION_NONE;
+        host_control_smi_type = HC_SMITYPE_NONE;
+
+        dcdbas_pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
+        if (IS_ERR(dcdbas_pdev))
+                return PTR_ERR(dcdbas_pdev);
+
+        /*
+         * BIOS SMI calls require buffer addresses be in 32-bit address space.
+         * This is done by setting the DMA mask below.
+         */
+        dcdbas_pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
+        dcdbas_pdev->dev.dma_mask = &dcdbas_pdev->dev.coherent_dma_mask;
+
+        register_reboot_notifier(&dcdbas_reboot_nb);
+
+        for (i = 0; dcdbas_bin_attrs[i]; i++)
+                sysfs_create_bin_file(&dcdbas_pdev->dev.kobj,
+                                      dcdbas_bin_attrs[i]);
+
+        for (i = 0; dcdbas_dev_attrs[i]; i++)
+                device_create_file(&dcdbas_pdev->dev, dcdbas_dev_attrs[i]);
+
+        dev_info(&dcdbas_pdev->dev, "%s (version %s)\n",
+                 DRIVER_DESCRIPTION, DRIVER_VERSION);
+
+        return 0;
+}
+
+/**
+ * dcdbas_exit: perform driver cleanup
+ */
+static void __exit dcdbas_exit(void)
+{
+        platform_device_unregister(dcdbas_pdev);
+        unregister_reboot_notifier(&dcdbas_reboot_nb);
+        smi_data_buf_free();
+}
+
+module_init(dcdbas_init);
+module_exit(dcdbas_exit);
+
+MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")");
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_AUTHOR("Dell Inc.");
+MODULE_LICENSE("GPL");
+
diff --git a/drivers/firmware/dcdbas.h b/drivers/firmware/dcdbas.h
new file mode 100644
index 000000000000..58a85182b3e8
--- /dev/null
+++ b/drivers/firmware/dcdbas.h
@@ -0,0 +1,107 @@
+/*
+ *  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/input.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 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, \
+                   .owner = THIS_MODULE }, \
+        .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));
+
+#endif /* _DCDBAS_H_ */
+
diff --git a/drivers/firmware/dell_rbu.c b/drivers/firmware/dell_rbu.c
new file mode 100644
index 000000000000..3b865f34a095
--- /dev/null
+++ b/drivers/firmware/dell_rbu.c
@@ -0,0 +1,634 @@
+/*
+ * dell_rbu.c
+ * Bios Update driver for Dell systems
+ * Author: Dell Inc
+ *         Abhay Salunke <abhay_salunke@dell.com>
+ *
+ * Copyright (C) 2005 Dell Inc.
+ *
+ * Remote BIOS Update (rbu) driver is used for updating DELL BIOS by
+ * creating entries in the /sys file systems on Linux 2.6 and higher
+ * kernels. The driver supports two mechanism to update the BIOS namely
+ * contiguous and packetized. Both these methods still require having some
+ * application to set the CMOS bit indicating the BIOS to update itself
+ * after a reboot.
+ *
+ * Contiguous method:
+ * This driver writes the incoming data in a monolithic image by allocating
+ * contiguous physical pages large enough to accommodate the incoming BIOS
+ * image size.
+ *
+ * Packetized method:
+ * The driver writes the incoming packet image by allocating a new packet
+ * on every time the packet data is written. This driver requires an
+ * application to break the BIOS image in to fixed sized packet chunks.
+ *
+ * See Documentation/dell_rbu.txt for more info.
+ *
+ * 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/version.h>
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/blkdev.h>
+#include <linux/device.h>
+#include <linux/spinlock.h>
+#include <linux/moduleparam.h>
+#include <linux/firmware.h>
+#include <linux/dma-mapping.h>
+
+MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>");
+MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.0");
+
+#define BIOS_SCAN_LIMIT 0xffffffff
+#define MAX_IMAGE_LENGTH 16
+static struct _rbu_data {
+        void *image_update_buffer;
+        unsigned long image_update_buffer_size;
+        unsigned long bios_image_size;
+        int image_update_ordernum;
+        int dma_alloc;
+        spinlock_t lock;
+        unsigned long packet_read_count;
+        unsigned long packet_write_count;
+        unsigned long num_packets;
+        unsigned long packetsize;
+} rbu_data;
+
+static char image_type[MAX_IMAGE_LENGTH] = "mono";
+module_param_string(image_type, image_type, sizeof(image_type), 0);
+MODULE_PARM_DESC(image_type, "BIOS image type. choose- mono or packet");
+
+struct packet_data {
+        struct list_head list;
+        size_t length;
+        void *data;
+        int ordernum;
+};
+
+static struct packet_data packet_data_head;
+
+static struct platform_device *rbu_device;
+static int context;
+static dma_addr_t dell_rbu_dmaaddr;
+
+static void init_packet_head(void)
+{
+        INIT_LIST_HEAD(&packet_data_head.list);
+        rbu_data.packet_write_count = 0;
+        rbu_data.packet_read_count = 0;
+        rbu_data.num_packets = 0;
+        rbu_data.packetsize = 0;
+}
+
+static int fill_last_packet(void *data, size_t length)
+{
+        struct list_head *ptemp_list;
+        struct packet_data *packet = NULL;
+        int packet_count = 0;
+
+        pr_debug("fill_last_packet: entry \n");
+
+        if (!rbu_data.num_packets) {
+                pr_debug("fill_last_packet: num_packets=0\n");
+                return -ENOMEM;
+        }
+
+        packet_count = rbu_data.num_packets;
+
+        ptemp_list = (&packet_data_head.list)->prev;
+
+        packet = list_entry(ptemp_list, struct packet_data, list);
+
+        if ((rbu_data.packet_write_count + length) > rbu_data.packetsize) {
+                pr_debug("dell_rbu:%s: packet size data "
+                         "overrun\n", __FUNCTION__);
+                return -EINVAL;
+        }
+
+        pr_debug("fill_last_packet : buffer = %p\n", packet->data);
+
+        memcpy((packet->data + rbu_data.packet_write_count), data, length);
+
+        if ((rbu_data.packet_write_count + length) == rbu_data.packetsize) {
+                /*
+                 * this was the last data chunk in the packet
+                 * so reinitialize the packet data counter to zero
+                 */
+                rbu_data.packet_write_count = 0;
+        } else
+                rbu_data.packet_write_count += length;
+
+        pr_debug("fill_last_packet: exit \n");
+        return 0;
+}
+
+static int create_packet(size_t length)
+{
+        struct packet_data *newpacket;
+        int ordernum = 0;
+
+        pr_debug("create_packet: entry \n");
+
+        if (!rbu_data.packetsize) {
+                pr_debug("create_packet: packetsize not specified\n");
+                return -EINVAL;
+        }
+
+        newpacket = kmalloc(sizeof(struct packet_data), GFP_KERNEL);
+        if (!newpacket) {
+                printk(KERN_WARNING
+                       "dell_rbu:%s: failed to allocate new "
+                       "packet\n", __FUNCTION__);
+                return -ENOMEM;
+        }
+
+        ordernum = get_order(length);
+        /*
+         * there is no upper limit on memory
+         * address for packetized mechanism
+         */
+        newpacket->data = (unsigned char *)__get_free_pages(GFP_KERNEL,
+                                                            ordernum);
+
+        pr_debug("create_packet: newpacket %p\n", newpacket->data);
+
+        if (!newpacket->data) {
+                printk(KERN_WARNING
+                       "dell_rbu:%s: failed to allocate new "
+                       "packet\n", __FUNCTION__);
+                kfree(newpacket);
+                return -ENOMEM;
+        }
+
+        newpacket->ordernum = ordernum;
+        ++rbu_data.num_packets;
+        /*
+         * initialize the newly created packet headers
+         */
+        INIT_LIST_HEAD(&newpacket->list);
+        list_add_tail(&newpacket->list, &packet_data_head.list);
+        /*
+         * packets have fixed size
+         */
+        newpacket->length = rbu_data.packetsize;
+
+        pr_debug("create_packet: exit \n");
+
+        return 0;
+}
+
+static int packetize_data(void *data, size_t length)
+{
+        int rc = 0;
+
+        if (!rbu_data.packet_write_count) {
+                if ((rc = create_packet(length)))
+                        return rc;
+        }
+        if ((rc = fill_last_packet(data, length)))
+                return rc;
+
+        return rc;
+}
+
+static int
+do_packet_read(char *data, struct list_head *ptemp_list,
+               int length, int bytes_read, int *list_read_count)
+{
+        void *ptemp_buf;
+        struct packet_data *newpacket = NULL;
+        int bytes_copied = 0;
+        int j = 0;
+
+        newpacket = list_entry(ptemp_list, struct packet_data, list);
+        *list_read_count += newpacket->length;
+
+        if (*list_read_count > bytes_read) {
+                /* point to the start of unread data */
+                j = newpacket->length - (*list_read_count - bytes_read);
+                /* point to the offset in the packet buffer */
+                ptemp_buf = (u8 *) newpacket->data + j;
+                /*
+                 * check if there is enough room in
+                 * * the incoming buffer
+                 */
+                if (length > (*list_read_count - bytes_read))
+                        /*
+                         * copy what ever is there in this
+                         * packet and move on
+                         */
+                        bytes_copied = (*list_read_count - bytes_read);
+                else
+                        /* copy the remaining */
+                        bytes_copied = length;
+                memcpy(data, ptemp_buf, bytes_copied);
+        }
+        return bytes_copied;
+}
+
+static int packet_read_list(char *data, size_t * pread_length)
+{
+        struct list_head *ptemp_list;
+        int temp_count = 0;
+        int bytes_copied = 0;
+        int bytes_read = 0;
+        int remaining_bytes = 0;
+        char *pdest = data;
+
+        /* check if we have any packets */
+        if (0 == rbu_data.num_packets)
+                return -ENOMEM;
+
+        remaining_bytes = *pread_length;
+        bytes_read = rbu_data.packet_read_count;
+
+        ptemp_list = (&packet_data_head.list)->next;
+        while (!list_empty(ptemp_list)) {
+                bytes_copied = do_packet_read(pdest, ptemp_list,
+                                              remaining_bytes, bytes_read,
+                                              &temp_count);
+                remaining_bytes -= bytes_copied;
+                bytes_read += bytes_copied;
+                pdest += bytes_copied;
+                /*
+                 * check if we reached end of buffer before reaching the
+                 * last packet
+                 */
+                if (remaining_bytes == 0)
+                        break;
+
+                ptemp_list = ptemp_list->next;
+        }
+        /*finally set the bytes read */
+        *pread_length = bytes_read - rbu_data.packet_read_count;
+        rbu_data.packet_read_count = bytes_read;
+        return 0;
+}
+
+static void packet_empty_list(void)
+{
+        struct list_head *ptemp_list;
+        struct list_head *pnext_list;
+        struct packet_data *newpacket;
+
+        ptemp_list = (&packet_data_head.list)->next;
+        while (!list_empty(ptemp_list)) {
+                newpacket =
+                    list_entry(ptemp_list, struct packet_data, list);
+                pnext_list = ptemp_list->next;
+                list_del(ptemp_list);
+                ptemp_list = pnext_list;
+                /*
+                 * zero out the RBU packet memory before freeing
+                 * to make sure there are no stale RBU packets left in memory
+                 */
+                memset(newpacket->data, 0, rbu_data.packetsize);
+                free_pages((unsigned long)newpacket->data,
+                           newpacket->ordernum);
+                kfree(newpacket);
+        }
+        rbu_data.packet_write_count = 0;
+        rbu_data.packet_read_count = 0;
+        rbu_data.num_packets = 0;
+        rbu_data.packetsize = 0;
+}
+
+/*
+ * img_update_free: Frees the buffer allocated for storing BIOS image
+ * Always called with lock held and returned with lock held
+ */
+static void img_update_free(void)
+{
+        if (!rbu_data.image_update_buffer)
+                return;
+        /*
+         * zero out this buffer before freeing it to get rid of any stale
+         * BIOS image copied in memory.
+         */
+        memset(rbu_data.image_update_buffer, 0,
+               rbu_data.image_update_buffer_size);
+        if (rbu_data.dma_alloc == 1)
+                dma_free_coherent(NULL, rbu_data.bios_image_size,
+                                  rbu_data.image_update_buffer,
+                                  dell_rbu_dmaaddr);
+        else
+                free_pages((unsigned long)rbu_data.image_update_buffer,
+                           rbu_data.image_update_ordernum);
+
+        /*
+         * Re-initialize the rbu_data variables after a free
+         */
+        rbu_data.image_update_ordernum = -1;
+        rbu_data.image_update_buffer = NULL;
+        rbu_data.image_update_buffer_size = 0;
+        rbu_data.bios_image_size = 0;
+        rbu_data.dma_alloc = 0;
+}
+
+/*
+ * img_update_realloc: This function allocates the contiguous pages to
+ * accommodate the requested size of data. The memory address and size
+ * values are stored globally and on every call to this function the new
+ * size is checked to see if more data is required than the existing size.
+ * If true the previous memory is freed and new allocation is done to
+ * accommodate the new size. If the incoming size is less then than the
+ * already allocated size, then that memory is reused. This function is
+ * called with lock held and returns with lock held.
+ */
+static int img_update_realloc(unsigned long size)
+{
+        unsigned char *image_update_buffer = NULL;
+        unsigned long rc;
+        unsigned long img_buf_phys_addr;
+        int ordernum;
+        int dma_alloc = 0;
+
+        /*
+         * check if the buffer of sufficient size has been
+         * already allocated
+         */
+        if (rbu_data.image_update_buffer_size >= size) {
+                /*
+                 * check for corruption
+                 */
+                if ((size != 0) && (rbu_data.image_update_buffer == NULL)) {
+                        printk(KERN_ERR "dell_rbu:%s: corruption "
+                               "check failed\n", __FUNCTION__);
+                        return -EINVAL;
+                }
+                /*
+                 * we have a valid pre-allocated buffer with
+                 * sufficient size
+                 */
+                return 0;
+        }
+
+        /*
+         * free any previously allocated buffer
+         */
+        img_update_free();
+
+        spin_unlock(&rbu_data.lock);
+
+        ordernum = get_order(size);
+        image_update_buffer =
+            (unsigned char *)__get_free_pages(GFP_KERNEL, ordernum);
+
+        img_buf_phys_addr =
+            (unsigned long)virt_to_phys(image_update_buffer);
+
+        if (img_buf_phys_addr > BIOS_SCAN_LIMIT) {
+                free_pages((unsigned long)image_update_buffer, ordernum);
+                ordernum = -1;
+                image_update_buffer = dma_alloc_coherent(NULL, size,
+                                                         &dell_rbu_dmaaddr,
+                                                         GFP_KERNEL);
+                dma_alloc = 1;
+        }
+
+        spin_lock(&rbu_data.lock);
+
+        if (image_update_buffer != NULL) {
+                rbu_data.image_update_buffer = image_update_buffer;
+                rbu_data.image_update_buffer_size = size;
+                rbu_data.bios_image_size =
+                    rbu_data.image_update_buffer_size;
+                rbu_data.image_update_ordernum = ordernum;
+                rbu_data.dma_alloc = dma_alloc;
+                rc = 0;
+        } else {
+                pr_debug("Not enough memory for image update:"
+                         "size = %ld\n", size);
+                rc = -ENOMEM;
+        }
+
+        return rc;
+}
+
+static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count)
+{
+        int retval;
+        size_t bytes_left;
+        size_t data_length;
+        char *ptempBuf = buffer;
+        unsigned long imagesize;
+
+        /* check to see if we have something to return */
+        if (rbu_data.num_packets == 0) {
+                pr_debug("read_packet_data: no packets written\n");
+                retval = -ENOMEM;
+                goto read_rbu_data_exit;
+        }
+
+        imagesize = rbu_data.num_packets * rbu_data.packetsize;
+
+        if (pos > imagesize) {
+                retval = 0;
+                printk(KERN_WARNING "dell_rbu:read_packet_data: "
+                       "data underrun\n");
+                goto read_rbu_data_exit;
+        }
+
+        bytes_left = imagesize - pos;
+        data_length = min(bytes_left, count);
+
+        if ((retval = packet_read_list(ptempBuf, &data_length)) < 0)
+                goto read_rbu_data_exit;
+
+        if ((pos + count) > imagesize) {
+                rbu_data.packet_read_count = 0;
+                /* this was the last copy */
+                retval = bytes_left;
+        } else
+                retval = count;
+
+      read_rbu_data_exit:
+        return retval;
+}
+
+static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count)
+{
+        unsigned char *ptemp = NULL;
+        size_t bytes_left = 0;
+        size_t data_length = 0;
+        ssize_t ret_count = 0;
+
+        /* check to see if we have something to return */
+        if ((rbu_data.image_update_buffer == NULL) ||
+            (rbu_data.bios_image_size == 0)) {
+                pr_debug("read_rbu_data_mono: image_update_buffer %p ,"
+                         "bios_image_size %lu\n",
+                         rbu_data.image_update_buffer,
+                         rbu_data.bios_image_size);
+                ret_count = -ENOMEM;
+                goto read_rbu_data_exit;
+        }
+
+        if (pos > rbu_data.bios_image_size) {
+                ret_count = 0;
+                goto read_rbu_data_exit;
+        }
+
+        bytes_left = rbu_data.bios_image_size - pos;
+        data_length = min(bytes_left, count);
+
+        ptemp = rbu_data.image_update_buffer;
+        memcpy(buffer, (ptemp + pos), data_length);
+
+        if ((pos + count) > rbu_data.bios_image_size)
+                /* this was the last copy */
+                ret_count = bytes_left;
+        else
+                ret_count = count;
+      read_rbu_data_exit:
+        return ret_count;
+}
+
+static ssize_t
+read_rbu_data(struct kobject *kobj, char *buffer, loff_t pos, size_t count)
+{
+        ssize_t ret_count = 0;
+
+        spin_lock(&rbu_data.lock);
+
+        if (!strcmp(image_type, "mono"))
+                ret_count = read_rbu_mono_data(buffer, pos, count);
+        else if (!strcmp(image_type, "packet"))
+                ret_count = read_packet_data(buffer, pos, count);
+        else
+                pr_debug("read_rbu_data: invalid image type specified\n");
+
+        spin_unlock(&rbu_data.lock);
+        return ret_count;
+}
+
+static ssize_t
+read_rbu_image_type(struct kobject *kobj, char *buffer, loff_t pos,
+                    size_t count)
+{
+        int size = 0;
+        if (!pos)
+                size = sprintf(buffer, "%s\n", image_type);
+        return size;
+}
+
+static ssize_t
+write_rbu_image_type(struct kobject *kobj, char *buffer, loff_t pos,
+                     size_t count)
+{
+        int rc = count;
+        spin_lock(&rbu_data.lock);
+
+        if (strlen(buffer) < MAX_IMAGE_LENGTH)
+                sscanf(buffer, "%s", image_type);
+        else
+                printk(KERN_WARNING "dell_rbu: image_type is invalid"
+                       "max chars = %d, \n incoming str--%s-- \n",
+                       MAX_IMAGE_LENGTH, buffer);
+
+        /* we must free all previous allocations */
+        packet_empty_list();
+        img_update_free();
+
+        spin_unlock(&rbu_data.lock);
+        return rc;
+
+}
+
+static struct bin_attribute rbu_data_attr = {
+        .attr = {.name = "data",.owner = THIS_MODULE,.mode = 0444},
+        .read = read_rbu_data,
+};
+
+static struct bin_attribute rbu_image_type_attr = {
+        .attr = {.name = "image_type",.owner = THIS_MODULE,.mode = 0644},
+        .read = read_rbu_image_type,
+        .write = write_rbu_image_type,
+};
+
+static void callbackfn_rbu(const struct firmware *fw, void *context)
+{
+        int rc = 0;
+
+        if (!fw || !fw->size)
+                return;
+
+        spin_lock(&rbu_data.lock);
+        if (!strcmp(image_type, "mono")) {
+                if (!img_update_realloc(fw->size))
+                        memcpy(rbu_data.image_update_buffer,
+                               fw->data, fw->size);
+        } else if (!strcmp(image_type, "packet")) {
+                if (!rbu_data.packetsize)
+                        rbu_data.packetsize = fw->size;
+                else if (rbu_data.packetsize != fw->size) {
+                        packet_empty_list();
+                        rbu_data.packetsize = fw->size;
+                }
+                packetize_data(fw->data, fw->size);
+        } else
+                pr_debug("invalid image type specified.\n");
+        spin_unlock(&rbu_data.lock);
+
+        rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG,
+                                     "dell_rbu", &rbu_device->dev,
+                                     &context, callbackfn_rbu);
+        if (rc)
+                printk(KERN_ERR
+                       "dell_rbu:%s request_firmware_nowait failed"
+                       " %d\n", __FUNCTION__, rc);
+}
+
+static int __init dcdrbu_init(void)
+{
+        int rc = 0;
+        spin_lock_init(&rbu_data.lock);
+
+        init_packet_head();
+        rbu_device =
+            platform_device_register_simple("dell_rbu", -1, NULL, 0);
+        if (!rbu_device) {
+                printk(KERN_ERR
+                       "dell_rbu:%s:platform_device_register_simple "
+                       "failed\n", __FUNCTION__);
+                return -EIO;
+        }
+
+        sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_data_attr);
+        sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr);
+
+        rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG,
+                                     "dell_rbu", &rbu_device->dev,
+                                     &context, callbackfn_rbu);
+        if (rc)
+                printk(KERN_ERR "dell_rbu:%s:request_firmware_nowait"
+                       " failed %d\n", __FUNCTION__, rc);
+
+        return rc;
+
+}
+
+static __exit void dcdrbu_exit(void)
+{
+        spin_lock(&rbu_data.lock);
+        packet_empty_list();
+        img_update_free();
+        spin_unlock(&rbu_data.lock);
+        platform_device_unregister(rbu_device);
+}
+
+module_exit(dcdrbu_exit);
+module_init(dcdrbu_init);