771 lines
19 KiB
C
771 lines
19 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* dcdbas.c: Dell Systems Management Base Driver
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*
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* The Dell Systems Management Base Driver provides a sysfs interface for
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* systems management software to perform System Management Interrupts (SMIs)
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* and Host Control Actions (power cycle or power off after OS shutdown) on
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* Dell systems.
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*
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* See Documentation/driver-api/dcdbas.rst for more information.
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*
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* Copyright (C) 1995-2006 Dell Inc.
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*/
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#include <linux/platform_device.h>
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#include <linux/acpi.h>
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#include <linux/dma-mapping.h>
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#include <linux/dmi.h>
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#include <linux/errno.h>
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#include <linux/cpu.h>
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#include <linux/gfp.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/mc146818rtc.h>
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#include <linux/module.h>
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#include <linux/reboot.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include "dcdbas.h"
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#define DRIVER_NAME "dcdbas"
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#define DRIVER_VERSION "5.6.0-3.4"
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#define DRIVER_DESCRIPTION "Dell Systems Management Base Driver"
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static struct platform_device *dcdbas_pdev;
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static u8 *smi_data_buf;
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static dma_addr_t smi_data_buf_handle;
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static unsigned long smi_data_buf_size;
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static unsigned long max_smi_data_buf_size = MAX_SMI_DATA_BUF_SIZE;
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static u32 smi_data_buf_phys_addr;
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static DEFINE_MUTEX(smi_data_lock);
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static u8 *bios_buffer;
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static unsigned int host_control_action;
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static unsigned int host_control_smi_type;
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static unsigned int host_control_on_shutdown;
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static bool wsmt_enabled;
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/**
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* smi_data_buf_free: free SMI data buffer
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*/
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static void smi_data_buf_free(void)
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{
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if (!smi_data_buf || wsmt_enabled)
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return;
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dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
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__func__, smi_data_buf_phys_addr, smi_data_buf_size);
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dma_free_coherent(&dcdbas_pdev->dev, smi_data_buf_size, smi_data_buf,
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smi_data_buf_handle);
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smi_data_buf = NULL;
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smi_data_buf_handle = 0;
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smi_data_buf_phys_addr = 0;
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smi_data_buf_size = 0;
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}
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/**
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* smi_data_buf_realloc: grow SMI data buffer if needed
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*/
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static int smi_data_buf_realloc(unsigned long size)
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{
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void *buf;
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dma_addr_t handle;
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if (smi_data_buf_size >= size)
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return 0;
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if (size > max_smi_data_buf_size)
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return -EINVAL;
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/* new buffer is needed */
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buf = dma_alloc_coherent(&dcdbas_pdev->dev, size, &handle, GFP_KERNEL);
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if (!buf) {
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dev_dbg(&dcdbas_pdev->dev,
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"%s: failed to allocate memory size %lu\n",
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__func__, size);
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return -ENOMEM;
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}
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/* memory zeroed by dma_alloc_coherent */
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if (smi_data_buf)
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memcpy(buf, smi_data_buf, smi_data_buf_size);
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/* free any existing buffer */
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smi_data_buf_free();
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/* set up new buffer for use */
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smi_data_buf = buf;
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smi_data_buf_handle = handle;
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smi_data_buf_phys_addr = (u32) virt_to_phys(buf);
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smi_data_buf_size = size;
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dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
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__func__, smi_data_buf_phys_addr, smi_data_buf_size);
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return 0;
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}
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static ssize_t smi_data_buf_phys_addr_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%x\n", smi_data_buf_phys_addr);
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}
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static ssize_t smi_data_buf_size_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%lu\n", smi_data_buf_size);
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}
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static ssize_t smi_data_buf_size_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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unsigned long buf_size;
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ssize_t ret;
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buf_size = simple_strtoul(buf, NULL, 10);
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/* make sure SMI data buffer is at least buf_size */
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mutex_lock(&smi_data_lock);
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ret = smi_data_buf_realloc(buf_size);
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mutex_unlock(&smi_data_lock);
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if (ret)
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return ret;
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return count;
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}
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static ssize_t smi_data_read(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t pos, size_t count)
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{
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ssize_t ret;
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mutex_lock(&smi_data_lock);
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ret = memory_read_from_buffer(buf, count, &pos, smi_data_buf,
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smi_data_buf_size);
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mutex_unlock(&smi_data_lock);
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return ret;
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}
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static ssize_t smi_data_write(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t pos, size_t count)
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{
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ssize_t ret;
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if ((pos + count) > max_smi_data_buf_size)
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return -EINVAL;
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mutex_lock(&smi_data_lock);
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ret = smi_data_buf_realloc(pos + count);
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if (ret)
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goto out;
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memcpy(smi_data_buf + pos, buf, count);
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ret = count;
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out:
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mutex_unlock(&smi_data_lock);
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return ret;
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}
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static ssize_t host_control_action_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%u\n", host_control_action);
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}
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static ssize_t host_control_action_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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ssize_t ret;
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/* make sure buffer is available for host control command */
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mutex_lock(&smi_data_lock);
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ret = smi_data_buf_realloc(sizeof(struct apm_cmd));
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mutex_unlock(&smi_data_lock);
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if (ret)
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return ret;
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host_control_action = simple_strtoul(buf, NULL, 10);
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return count;
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}
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static ssize_t host_control_smi_type_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%u\n", host_control_smi_type);
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}
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static ssize_t host_control_smi_type_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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host_control_smi_type = simple_strtoul(buf, NULL, 10);
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return count;
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}
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static ssize_t host_control_on_shutdown_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%u\n", host_control_on_shutdown);
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}
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static ssize_t host_control_on_shutdown_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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host_control_on_shutdown = simple_strtoul(buf, NULL, 10);
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return count;
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}
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static int raise_smi(void *par)
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{
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struct smi_cmd *smi_cmd = par;
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if (smp_processor_id() != 0) {
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dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
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__func__);
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return -EBUSY;
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}
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/* generate SMI */
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/* inb to force posted write through and make SMI happen now */
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asm volatile (
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"outb %b0,%w1\n"
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"inb %w1"
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: /* no output args */
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: "a" (smi_cmd->command_code),
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"d" (smi_cmd->command_address),
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"b" (smi_cmd->ebx),
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"c" (smi_cmd->ecx)
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: "memory"
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);
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return 0;
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}
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/**
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* dcdbas_smi_request: generate SMI request
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*
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* Called with smi_data_lock.
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*/
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int dcdbas_smi_request(struct smi_cmd *smi_cmd)
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{
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int ret;
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if (smi_cmd->magic != SMI_CMD_MAGIC) {
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dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",
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__func__);
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return -EBADR;
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}
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/* SMI requires CPU 0 */
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get_online_cpus();
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ret = smp_call_on_cpu(0, raise_smi, smi_cmd, true);
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put_online_cpus();
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return ret;
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}
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/**
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* smi_request_store:
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*
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* The valid values are:
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* 0: zero SMI data buffer
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* 1: generate calling interface SMI
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* 2: generate raw SMI
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*
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* User application writes smi_cmd to smi_data before telling driver
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* to generate SMI.
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*/
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static ssize_t smi_request_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct smi_cmd *smi_cmd;
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unsigned long val = simple_strtoul(buf, NULL, 10);
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ssize_t ret;
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mutex_lock(&smi_data_lock);
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if (smi_data_buf_size < sizeof(struct smi_cmd)) {
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ret = -ENODEV;
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goto out;
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}
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smi_cmd = (struct smi_cmd *)smi_data_buf;
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switch (val) {
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case 2:
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/* Raw SMI */
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ret = dcdbas_smi_request(smi_cmd);
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if (!ret)
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ret = count;
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break;
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case 1:
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/*
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* Calling Interface SMI
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*
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* Provide physical address of command buffer field within
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* the struct smi_cmd to BIOS.
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*
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* Because the address that smi_cmd (smi_data_buf) points to
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* will be from memremap() of a non-memory address if WSMT
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* is present, we can't use virt_to_phys() on smi_cmd, so
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* we have to use the physical address that was saved when
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* the virtual address for smi_cmd was received.
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*/
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smi_cmd->ebx = smi_data_buf_phys_addr +
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offsetof(struct smi_cmd, command_buffer);
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ret = dcdbas_smi_request(smi_cmd);
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if (!ret)
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ret = count;
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break;
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case 0:
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memset(smi_data_buf, 0, smi_data_buf_size);
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ret = count;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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out:
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mutex_unlock(&smi_data_lock);
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return ret;
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}
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EXPORT_SYMBOL(dcdbas_smi_request);
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/**
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* host_control_smi: generate host control SMI
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*
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* Caller must set up the host control command in smi_data_buf.
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*/
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static int host_control_smi(void)
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{
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struct apm_cmd *apm_cmd;
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u8 *data;
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unsigned long flags;
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u32 num_ticks;
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s8 cmd_status;
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u8 index;
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apm_cmd = (struct apm_cmd *)smi_data_buf;
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apm_cmd->status = ESM_STATUS_CMD_UNSUCCESSFUL;
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switch (host_control_smi_type) {
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case HC_SMITYPE_TYPE1:
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spin_lock_irqsave(&rtc_lock, flags);
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/* write SMI data buffer physical address */
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data = (u8 *)&smi_data_buf_phys_addr;
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for (index = PE1300_CMOS_CMD_STRUCT_PTR;
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index < (PE1300_CMOS_CMD_STRUCT_PTR + 4);
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index++, data++) {
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outb(index,
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(CMOS_BASE_PORT + CMOS_PAGE2_INDEX_PORT_PIIX4));
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outb(*data,
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(CMOS_BASE_PORT + CMOS_PAGE2_DATA_PORT_PIIX4));
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}
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/* first set status to -1 as called by spec */
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cmd_status = ESM_STATUS_CMD_UNSUCCESSFUL;
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outb((u8) cmd_status, PCAT_APM_STATUS_PORT);
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/* generate SMM call */
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outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
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spin_unlock_irqrestore(&rtc_lock, flags);
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/* wait a few to see if it executed */
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num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
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while ((cmd_status = inb(PCAT_APM_STATUS_PORT))
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== ESM_STATUS_CMD_UNSUCCESSFUL) {
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num_ticks--;
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if (num_ticks == EXPIRED_TIMER)
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return -ETIME;
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}
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break;
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case HC_SMITYPE_TYPE2:
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case HC_SMITYPE_TYPE3:
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spin_lock_irqsave(&rtc_lock, flags);
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/* write SMI data buffer physical address */
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data = (u8 *)&smi_data_buf_phys_addr;
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for (index = PE1400_CMOS_CMD_STRUCT_PTR;
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index < (PE1400_CMOS_CMD_STRUCT_PTR + 4);
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index++, data++) {
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outb(index, (CMOS_BASE_PORT + CMOS_PAGE1_INDEX_PORT));
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outb(*data, (CMOS_BASE_PORT + CMOS_PAGE1_DATA_PORT));
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}
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/* generate SMM call */
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if (host_control_smi_type == HC_SMITYPE_TYPE3)
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outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
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else
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outb(ESM_APM_CMD, PE1400_APM_CONTROL_PORT);
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/* restore RTC index pointer since it was written to above */
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CMOS_READ(RTC_REG_C);
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spin_unlock_irqrestore(&rtc_lock, flags);
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/* read control port back to serialize write */
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cmd_status = inb(PE1400_APM_CONTROL_PORT);
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/* wait a few to see if it executed */
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num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
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while (apm_cmd->status == ESM_STATUS_CMD_UNSUCCESSFUL) {
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num_ticks--;
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||
|
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)
|
||
|
{
|
||
|
const struct dmi_device *dev = NULL;
|
||
|
struct acpi_table_wsmt *wsmt = NULL;
|
||
|
struct smm_eps_table *eps = NULL;
|
||
|
u64 bios_buf_paddr;
|
||
|
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;
|
||
|
|
||
|
/*
|
||
|
* BIOS could provide the address/size of the protected buffer
|
||
|
* in an SMBIOS string or in an EPS structure in 0xFxxxx.
|
||
|
*/
|
||
|
|
||
|
/* Check SMBIOS for buffer address */
|
||
|
while ((dev = dmi_find_device(DMI_DEV_TYPE_OEM_STRING, NULL, dev)))
|
||
|
if (sscanf(dev->name, "30[%16llx;%8llx]", &bios_buf_paddr,
|
||
|
&remap_size) == 2)
|
||
|
goto remap;
|
||
|
|
||
|
/* 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 firmware buffer found\n");
|
||
|
return -ENODEV;
|
||
|
}
|
||
|
bios_buf_paddr = eps->smm_comm_buff_addr;
|
||
|
remap_size = eps->num_of_4k_pages * PAGE_SIZE;
|
||
|
|
||
|
remap:
|
||
|
/*
|
||
|
* 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(bios_buf_paddr + 8)) {
|
||
|
dev_warn(&dcdbas_pdev->dev, "found WSMT, but 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).
|
||
|
*/
|
||
|
if (remap_size > MAX_SMI_DATA_BUF_SIZE + 8)
|
||
|
remap_size = MAX_SMI_DATA_BUF_SIZE + 8;
|
||
|
|
||
|
bios_buffer = memremap(bios_buf_paddr, remap_size, MEMREMAP_WB);
|
||
|
if (!bios_buffer) {
|
||
|
dev_warn(&dcdbas_pdev->dev, "found WSMT, but failed to map buffer\n");
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
|
||
|
/* First 8 bytes is for a semaphore, not part of the smi_data_buf */
|
||
|
smi_data_buf_phys_addr = bios_buf_paddr + 8;
|
||
|
smi_data_buf = bios_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 (bios_buffer)
|
||
|
memunmap(bios_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]*:*");
|