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![Lucas Stach](/assets/img/avatar_default.png)
Commits190aa4304d
(Add AMD Mullins platform support) andcca118fa2a
(Add AMD Carrizo platform support) enabled the driver on a lot more devices, but the following commit missed a single location in the code when checking if the SB800 register offsets should be used. This leads to the wrong register being written which in turn causes ACPI to go haywire. Fix this by introducing a helper function to check for the new register layout and use this consistently. https://bugzilla.kernel.org/show_bug.cgi?id=114201 https://bugzilla.redhat.com/show_bug.cgi?id=1329910 Fixes:bdecfcdb54
(sp5100_tco: fix the device check for SB800 and later chipsets) Cc: stable@vger.kernel.org (4.5+) Signed-off-by: Lucas Stach <dev@lynxeye.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
594 lines
15 KiB
C
594 lines
15 KiB
C
/*
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* sp5100_tco : TCO timer driver for sp5100 chipsets
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*
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* (c) Copyright 2009 Google Inc., All Rights Reserved.
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*
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* Based on i8xx_tco.c:
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* (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de>, All Rights
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* Reserved.
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* http://www.kernelconcepts.de
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* See AMD Publication 43009 "AMD SB700/710/750 Register Reference Guide",
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* AMD Publication 45482 "AMD SB800-Series Southbridges Register
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* Reference Guide"
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*/
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/*
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* Includes, defines, variables, module parameters, ...
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/pci.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include "sp5100_tco.h"
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/* Module and version information */
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#define TCO_VERSION "0.05"
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#define TCO_MODULE_NAME "SP5100 TCO timer"
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#define TCO_DRIVER_NAME TCO_MODULE_NAME ", v" TCO_VERSION
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/* internal variables */
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static u32 tcobase_phys;
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static u32 tco_wdt_fired;
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static void __iomem *tcobase;
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static unsigned int pm_iobase;
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static DEFINE_SPINLOCK(tco_lock); /* Guards the hardware */
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static unsigned long timer_alive;
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static char tco_expect_close;
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static struct pci_dev *sp5100_tco_pci;
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/* the watchdog platform device */
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static struct platform_device *sp5100_tco_platform_device;
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/* module parameters */
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#define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat. */
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static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
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module_param(heartbeat, int, 0);
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MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (default="
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__MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started."
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" (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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/*
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* Some TCO specific functions
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*/
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static bool tco_has_sp5100_reg_layout(struct pci_dev *dev)
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{
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return dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
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dev->revision < 0x40;
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}
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static void tco_timer_start(void)
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{
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u32 val;
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unsigned long flags;
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spin_lock_irqsave(&tco_lock, flags);
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val = readl(SP5100_WDT_CONTROL(tcobase));
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val |= SP5100_WDT_START_STOP_BIT;
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writel(val, SP5100_WDT_CONTROL(tcobase));
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spin_unlock_irqrestore(&tco_lock, flags);
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}
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static void tco_timer_stop(void)
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{
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u32 val;
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unsigned long flags;
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spin_lock_irqsave(&tco_lock, flags);
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val = readl(SP5100_WDT_CONTROL(tcobase));
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val &= ~SP5100_WDT_START_STOP_BIT;
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writel(val, SP5100_WDT_CONTROL(tcobase));
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spin_unlock_irqrestore(&tco_lock, flags);
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}
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static void tco_timer_keepalive(void)
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{
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u32 val;
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unsigned long flags;
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spin_lock_irqsave(&tco_lock, flags);
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val = readl(SP5100_WDT_CONTROL(tcobase));
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val |= SP5100_WDT_TRIGGER_BIT;
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writel(val, SP5100_WDT_CONTROL(tcobase));
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spin_unlock_irqrestore(&tco_lock, flags);
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}
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static int tco_timer_set_heartbeat(int t)
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{
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unsigned long flags;
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if (t < 0 || t > 0xffff)
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return -EINVAL;
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/* Write new heartbeat to watchdog */
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spin_lock_irqsave(&tco_lock, flags);
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writel(t, SP5100_WDT_COUNT(tcobase));
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spin_unlock_irqrestore(&tco_lock, flags);
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heartbeat = t;
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return 0;
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}
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static void tco_timer_enable(void)
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{
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int val;
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if (!tco_has_sp5100_reg_layout(sp5100_tco_pci)) {
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/* For SB800 or later */
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/* Set the Watchdog timer resolution to 1 sec */
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outb(SB800_PM_WATCHDOG_CONFIG, SB800_IO_PM_INDEX_REG);
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val = inb(SB800_IO_PM_DATA_REG);
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val |= SB800_PM_WATCHDOG_SECOND_RES;
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outb(val, SB800_IO_PM_DATA_REG);
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/* Enable watchdog decode bit and watchdog timer */
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outb(SB800_PM_WATCHDOG_CONTROL, SB800_IO_PM_INDEX_REG);
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val = inb(SB800_IO_PM_DATA_REG);
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val |= SB800_PCI_WATCHDOG_DECODE_EN;
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val &= ~SB800_PM_WATCHDOG_DISABLE;
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outb(val, SB800_IO_PM_DATA_REG);
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} else {
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/* For SP5100 or SB7x0 */
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/* Enable watchdog decode bit */
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pci_read_config_dword(sp5100_tco_pci,
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SP5100_PCI_WATCHDOG_MISC_REG,
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&val);
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val |= SP5100_PCI_WATCHDOG_DECODE_EN;
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pci_write_config_dword(sp5100_tco_pci,
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SP5100_PCI_WATCHDOG_MISC_REG,
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val);
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/* Enable Watchdog timer and set the resolution to 1 sec */
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outb(SP5100_PM_WATCHDOG_CONTROL, SP5100_IO_PM_INDEX_REG);
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val = inb(SP5100_IO_PM_DATA_REG);
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val |= SP5100_PM_WATCHDOG_SECOND_RES;
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val &= ~SP5100_PM_WATCHDOG_DISABLE;
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outb(val, SP5100_IO_PM_DATA_REG);
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}
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}
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/*
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* /dev/watchdog handling
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*/
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static int sp5100_tco_open(struct inode *inode, struct file *file)
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{
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/* /dev/watchdog can only be opened once */
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if (test_and_set_bit(0, &timer_alive))
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return -EBUSY;
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/* Reload and activate timer */
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tco_timer_start();
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tco_timer_keepalive();
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return nonseekable_open(inode, file);
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}
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static int sp5100_tco_release(struct inode *inode, struct file *file)
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{
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/* Shut off the timer. */
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if (tco_expect_close == 42) {
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tco_timer_stop();
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} else {
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pr_crit("Unexpected close, not stopping watchdog!\n");
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tco_timer_keepalive();
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}
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clear_bit(0, &timer_alive);
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tco_expect_close = 0;
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return 0;
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}
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static ssize_t sp5100_tco_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos)
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{
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/* See if we got the magic character 'V' and reload the timer */
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if (len) {
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if (!nowayout) {
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size_t i;
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/* note: just in case someone wrote the magic character
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* five months ago... */
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tco_expect_close = 0;
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/* scan to see whether or not we got the magic character
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*/
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for (i = 0; i != len; i++) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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tco_expect_close = 42;
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}
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}
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/* someone wrote to us, we should reload the timer */
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tco_timer_keepalive();
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}
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return len;
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}
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static long sp5100_tco_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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int new_options, retval = -EINVAL;
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int new_heartbeat;
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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static const struct watchdog_info ident = {
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.options = WDIOF_SETTIMEOUT |
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WDIOF_KEEPALIVEPING |
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WDIOF_MAGICCLOSE,
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.firmware_version = 0,
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.identity = TCO_MODULE_NAME,
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};
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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return copy_to_user(argp, &ident,
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sizeof(ident)) ? -EFAULT : 0;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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case WDIOC_SETOPTIONS:
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if (get_user(new_options, p))
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return -EFAULT;
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if (new_options & WDIOS_DISABLECARD) {
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tco_timer_stop();
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retval = 0;
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}
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if (new_options & WDIOS_ENABLECARD) {
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tco_timer_start();
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tco_timer_keepalive();
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retval = 0;
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}
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return retval;
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case WDIOC_KEEPALIVE:
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tco_timer_keepalive();
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return 0;
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case WDIOC_SETTIMEOUT:
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if (get_user(new_heartbeat, p))
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return -EFAULT;
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if (tco_timer_set_heartbeat(new_heartbeat))
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return -EINVAL;
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tco_timer_keepalive();
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/* Fall through */
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case WDIOC_GETTIMEOUT:
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return put_user(heartbeat, p);
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default:
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return -ENOTTY;
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}
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}
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/*
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* Kernel Interfaces
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*/
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static const struct file_operations sp5100_tco_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = sp5100_tco_write,
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.unlocked_ioctl = sp5100_tco_ioctl,
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.open = sp5100_tco_open,
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.release = sp5100_tco_release,
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};
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static struct miscdevice sp5100_tco_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &sp5100_tco_fops,
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};
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/*
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* Data for PCI driver interface
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*
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* This data only exists for exporting the supported
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* PCI ids via MODULE_DEVICE_TABLE. We do not actually
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* register a pci_driver, because someone else might
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* want to register another driver on the same PCI id.
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*/
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static const struct pci_device_id sp5100_tco_pci_tbl[] = {
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{ PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS, PCI_ANY_ID,
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PCI_ANY_ID, },
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{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, PCI_ANY_ID,
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PCI_ANY_ID, },
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{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS, PCI_ANY_ID,
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PCI_ANY_ID, },
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{ 0, }, /* End of list */
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};
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MODULE_DEVICE_TABLE(pci, sp5100_tco_pci_tbl);
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/*
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* Init & exit routines
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*/
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static unsigned char sp5100_tco_setupdevice(void)
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{
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struct pci_dev *dev = NULL;
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const char *dev_name = NULL;
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u32 val;
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u32 index_reg, data_reg, base_addr;
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/* Match the PCI device */
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for_each_pci_dev(dev) {
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if (pci_match_id(sp5100_tco_pci_tbl, dev) != NULL) {
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sp5100_tco_pci = dev;
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break;
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}
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}
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if (!sp5100_tco_pci)
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return 0;
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pr_info("PCI Vendor ID: 0x%x, Device ID: 0x%x, Revision ID: 0x%x\n",
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sp5100_tco_pci->vendor, sp5100_tco_pci->device,
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sp5100_tco_pci->revision);
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/*
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* Determine type of southbridge chipset.
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*/
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if (tco_has_sp5100_reg_layout(sp5100_tco_pci)) {
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dev_name = SP5100_DEVNAME;
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index_reg = SP5100_IO_PM_INDEX_REG;
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data_reg = SP5100_IO_PM_DATA_REG;
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base_addr = SP5100_PM_WATCHDOG_BASE;
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} else {
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dev_name = SB800_DEVNAME;
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index_reg = SB800_IO_PM_INDEX_REG;
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data_reg = SB800_IO_PM_DATA_REG;
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base_addr = SB800_PM_WATCHDOG_BASE;
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}
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/* Request the IO ports used by this driver */
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pm_iobase = SP5100_IO_PM_INDEX_REG;
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if (!request_region(pm_iobase, SP5100_PM_IOPORTS_SIZE, dev_name)) {
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pr_err("I/O address 0x%04x already in use\n", pm_iobase);
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goto exit;
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}
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/*
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* First, Find the watchdog timer MMIO address from indirect I/O.
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*/
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outb(base_addr+3, index_reg);
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val = inb(data_reg);
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outb(base_addr+2, index_reg);
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val = val << 8 | inb(data_reg);
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outb(base_addr+1, index_reg);
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val = val << 8 | inb(data_reg);
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outb(base_addr+0, index_reg);
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/* Low three bits of BASE are reserved */
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val = val << 8 | (inb(data_reg) & 0xf8);
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pr_debug("Got 0x%04x from indirect I/O\n", val);
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/* Check MMIO address conflict */
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if (request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
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dev_name))
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goto setup_wdt;
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else
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pr_debug("MMIO address 0x%04x already in use\n", val);
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/*
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* Secondly, Find the watchdog timer MMIO address
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* from SBResource_MMIO register.
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*/
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if (tco_has_sp5100_reg_layout(sp5100_tco_pci)) {
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/* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */
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pci_read_config_dword(sp5100_tco_pci,
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SP5100_SB_RESOURCE_MMIO_BASE, &val);
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} else {
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/* Read SBResource_MMIO from AcpiMmioEn(PM_Reg: 24h) */
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outb(SB800_PM_ACPI_MMIO_EN+3, SB800_IO_PM_INDEX_REG);
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val = inb(SB800_IO_PM_DATA_REG);
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outb(SB800_PM_ACPI_MMIO_EN+2, SB800_IO_PM_INDEX_REG);
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val = val << 8 | inb(SB800_IO_PM_DATA_REG);
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outb(SB800_PM_ACPI_MMIO_EN+1, SB800_IO_PM_INDEX_REG);
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val = val << 8 | inb(SB800_IO_PM_DATA_REG);
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outb(SB800_PM_ACPI_MMIO_EN+0, SB800_IO_PM_INDEX_REG);
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val = val << 8 | inb(SB800_IO_PM_DATA_REG);
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}
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/* The SBResource_MMIO is enabled and mapped memory space? */
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if ((val & (SB800_ACPI_MMIO_DECODE_EN | SB800_ACPI_MMIO_SEL)) ==
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SB800_ACPI_MMIO_DECODE_EN) {
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/* Clear unnecessary the low twelve bits */
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val &= ~0xFFF;
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/* Add the Watchdog Timer offset to base address. */
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val += SB800_PM_WDT_MMIO_OFFSET;
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/* Check MMIO address conflict */
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if (request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
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dev_name)) {
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pr_debug("Got 0x%04x from SBResource_MMIO register\n",
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val);
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goto setup_wdt;
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} else
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pr_debug("MMIO address 0x%04x already in use\n", val);
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} else
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pr_debug("SBResource_MMIO is disabled(0x%04x)\n", val);
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pr_notice("failed to find MMIO address, giving up.\n");
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goto unreg_region;
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setup_wdt:
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tcobase_phys = val;
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tcobase = ioremap(val, SP5100_WDT_MEM_MAP_SIZE);
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if (!tcobase) {
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pr_err("failed to get tcobase address\n");
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goto unreg_mem_region;
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}
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pr_info("Using 0x%04x for watchdog MMIO address\n", val);
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/* Setup the watchdog timer */
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tco_timer_enable();
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/* Check that the watchdog action is set to reset the system */
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val = readl(SP5100_WDT_CONTROL(tcobase));
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/*
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* Save WatchDogFired status, because WatchDogFired flag is
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* cleared here.
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*/
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tco_wdt_fired = val & SP5100_PM_WATCHDOG_FIRED;
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val &= ~SP5100_PM_WATCHDOG_ACTION_RESET;
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writel(val, SP5100_WDT_CONTROL(tcobase));
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/* Set a reasonable heartbeat before we stop the timer */
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tco_timer_set_heartbeat(heartbeat);
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/*
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* Stop the TCO before we change anything so we don't race with
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* a zeroed timer.
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*/
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tco_timer_stop();
|
|
|
|
/* Done */
|
|
return 1;
|
|
|
|
unreg_mem_region:
|
|
release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
|
|
unreg_region:
|
|
release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
|
|
exit:
|
|
return 0;
|
|
}
|
|
|
|
static int sp5100_tco_init(struct platform_device *dev)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Check whether or not the hardware watchdog is there. If found, then
|
|
* set it up.
|
|
*/
|
|
if (!sp5100_tco_setupdevice())
|
|
return -ENODEV;
|
|
|
|
/* Check to see if last reboot was due to watchdog timeout */
|
|
pr_info("Last reboot was %striggered by watchdog.\n",
|
|
tco_wdt_fired ? "" : "not ");
|
|
|
|
/*
|
|
* Check that the heartbeat value is within it's range.
|
|
* If not, reset to the default.
|
|
*/
|
|
if (tco_timer_set_heartbeat(heartbeat)) {
|
|
heartbeat = WATCHDOG_HEARTBEAT;
|
|
tco_timer_set_heartbeat(heartbeat);
|
|
}
|
|
|
|
ret = misc_register(&sp5100_tco_miscdev);
|
|
if (ret != 0) {
|
|
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
|
|
WATCHDOG_MINOR, ret);
|
|
goto exit;
|
|
}
|
|
|
|
clear_bit(0, &timer_alive);
|
|
|
|
/* Show module parameters */
|
|
pr_info("initialized (0x%p). heartbeat=%d sec (nowayout=%d)\n",
|
|
tcobase, heartbeat, nowayout);
|
|
|
|
return 0;
|
|
|
|
exit:
|
|
iounmap(tcobase);
|
|
release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
|
|
release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
|
|
return ret;
|
|
}
|
|
|
|
static void sp5100_tco_cleanup(void)
|
|
{
|
|
/* Stop the timer before we leave */
|
|
if (!nowayout)
|
|
tco_timer_stop();
|
|
|
|
/* Deregister */
|
|
misc_deregister(&sp5100_tco_miscdev);
|
|
iounmap(tcobase);
|
|
release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
|
|
release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
|
|
}
|
|
|
|
static int sp5100_tco_remove(struct platform_device *dev)
|
|
{
|
|
if (tcobase)
|
|
sp5100_tco_cleanup();
|
|
return 0;
|
|
}
|
|
|
|
static void sp5100_tco_shutdown(struct platform_device *dev)
|
|
{
|
|
tco_timer_stop();
|
|
}
|
|
|
|
static struct platform_driver sp5100_tco_driver = {
|
|
.probe = sp5100_tco_init,
|
|
.remove = sp5100_tco_remove,
|
|
.shutdown = sp5100_tco_shutdown,
|
|
.driver = {
|
|
.name = TCO_MODULE_NAME,
|
|
},
|
|
};
|
|
|
|
static int __init sp5100_tco_init_module(void)
|
|
{
|
|
int err;
|
|
|
|
pr_info("SP5100/SB800 TCO WatchDog Timer Driver v%s\n", TCO_VERSION);
|
|
|
|
err = platform_driver_register(&sp5100_tco_driver);
|
|
if (err)
|
|
return err;
|
|
|
|
sp5100_tco_platform_device = platform_device_register_simple(
|
|
TCO_MODULE_NAME, -1, NULL, 0);
|
|
if (IS_ERR(sp5100_tco_platform_device)) {
|
|
err = PTR_ERR(sp5100_tco_platform_device);
|
|
goto unreg_platform_driver;
|
|
}
|
|
|
|
return 0;
|
|
|
|
unreg_platform_driver:
|
|
platform_driver_unregister(&sp5100_tco_driver);
|
|
return err;
|
|
}
|
|
|
|
static void __exit sp5100_tco_cleanup_module(void)
|
|
{
|
|
platform_device_unregister(sp5100_tco_platform_device);
|
|
platform_driver_unregister(&sp5100_tco_driver);
|
|
pr_info("SP5100/SB800 TCO Watchdog Module Unloaded\n");
|
|
}
|
|
|
|
module_init(sp5100_tco_init_module);
|
|
module_exit(sp5100_tco_cleanup_module);
|
|
|
|
MODULE_AUTHOR("Priyanka Gupta");
|
|
MODULE_DESCRIPTION("TCO timer driver for SP5100/SB800 chipset");
|
|
MODULE_LICENSE("GPL");
|