![Russell King](/assets/img/avatar_default.png)
Convert everyone who uses platform_bus_type to include linux/platform_device.h. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
597 lines
14 KiB
C
597 lines
14 KiB
C
/*
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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/dcdbas.txt for more information.
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*
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* Copyright (C) 1995-2005 Dell Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License v2.0 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/errno.h>
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#include <linux/init.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 <asm/io.h>
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#include <asm/semaphore.h>
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#include "dcdbas.h"
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#define DRIVER_NAME "dcdbas"
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#define DRIVER_VERSION "5.6.0-1"
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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 u32 smi_data_buf_phys_addr;
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static DECLARE_MUTEX(smi_data_lock);
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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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/**
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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)
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return;
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dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
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__FUNCTION__, 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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__FUNCTION__, 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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__FUNCTION__, 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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down(&smi_data_lock);
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ret = smi_data_buf_realloc(buf_size);
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up(&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 kobject *kobj, char *buf, loff_t pos,
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size_t count)
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{
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size_t max_read;
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ssize_t ret;
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down(&smi_data_lock);
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if (pos >= smi_data_buf_size) {
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ret = 0;
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goto out;
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}
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max_read = smi_data_buf_size - pos;
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ret = min(max_read, count);
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memcpy(buf, smi_data_buf + pos, ret);
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out:
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up(&smi_data_lock);
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return ret;
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}
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static ssize_t smi_data_write(struct kobject *kobj, char *buf, loff_t pos,
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size_t count)
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{
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ssize_t ret;
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down(&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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up(&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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down(&smi_data_lock);
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ret = smi_data_buf_realloc(sizeof(struct apm_cmd));
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up(&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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/**
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* 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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static int smi_request(struct smi_cmd *smi_cmd)
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{
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cpumask_t old_mask;
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int ret = 0;
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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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__FUNCTION__);
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return -EBADR;
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}
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/* SMI requires CPU 0 */
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old_mask = current->cpus_allowed;
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set_cpus_allowed(current, cpumask_of_cpu(0));
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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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__FUNCTION__);
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ret = -EBUSY;
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goto out;
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}
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/* generate SMI */
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asm volatile (
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"outb %b0,%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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out:
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set_cpus_allowed(current, old_mask);
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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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down(&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 = 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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/* Calling Interface SMI */
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smi_cmd->ebx = (u32) virt_to_phys(smi_cmd->command_buffer);
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ret = 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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up(&smi_data_lock);
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return ret;
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}
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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)
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return -ETIME;
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}
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break;
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default:
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dev_dbg(&dcdbas_pdev->dev, "%s: invalid SMI type %u\n",
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__FUNCTION__, host_control_smi_type);
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return -ENOSYS;
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}
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return 0;
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}
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/**
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* dcdbas_host_control: initiate host control
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*
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* This function is called by the driver after the system has
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* finished shutting down if the user application specified a
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* host control action to perform on shutdown. It is safe to
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* use smi_data_buf at this point because the system has finished
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* shutting down and no userspace apps are running.
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*/
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static void dcdbas_host_control(void)
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{
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struct apm_cmd *apm_cmd;
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u8 action;
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if (host_control_action == HC_ACTION_NONE)
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return;
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action = host_control_action;
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host_control_action = HC_ACTION_NONE;
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if (!smi_data_buf) {
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dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __FUNCTION__);
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return;
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}
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if (smi_data_buf_size < sizeof(struct apm_cmd)) {
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dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n",
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__FUNCTION__);
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return;
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}
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apm_cmd = (struct apm_cmd *)smi_data_buf;
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/* power off takes precedence */
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if (action & HC_ACTION_HOST_CONTROL_POWEROFF) {
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apm_cmd->command = ESM_APM_POWER_CYCLE;
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apm_cmd->reserved = 0;
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*((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 0;
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host_control_smi();
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} else if (action & HC_ACTION_HOST_CONTROL_POWERCYCLE) {
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apm_cmd->command = ESM_APM_POWER_CYCLE;
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apm_cmd->reserved = 0;
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*((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 20;
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host_control_smi();
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}
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}
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/**
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* dcdbas_reboot_notify: handle reboot notification for host control
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*/
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static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code,
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void *unused)
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{
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static unsigned int notify_cnt = 0;
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switch (code) {
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case SYS_DOWN:
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case SYS_HALT:
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case SYS_POWER_OFF:
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if (host_control_on_shutdown) {
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/* firmware is going to perform host control action */
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if (++notify_cnt == 2) {
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printk(KERN_WARNING
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"Please wait for shutdown "
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"action to complete...\n");
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dcdbas_host_control();
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}
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/*
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* register again and initiate the host control
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* action on the second notification to allow
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* everyone that registered to be notified
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*/
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register_reboot_notifier(nb);
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}
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break;
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block dcdbas_reboot_nb = {
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.notifier_call = dcdbas_reboot_notify,
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.next = NULL,
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.priority = 0
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};
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static DCDBAS_BIN_ATTR_RW(smi_data);
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static struct bin_attribute *dcdbas_bin_attrs[] = {
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&bin_attr_smi_data,
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|
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");
|
|
|