582 lines
14 KiB
C
582 lines
14 KiB
C
/*
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* Kontron PLD watchdog driver
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*
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* Copyright (c) 2010-2013 Kontron Europe GmbH
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* Author: Michael Brunner <michael.brunner@kontron.com>
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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 2 as published
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* by 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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* Note: From the PLD watchdog point of view timeout and pretimeout are
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* defined differently than in the kernel.
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* First the pretimeout stage runs out before the timeout stage gets
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* active.
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*
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* Kernel/API: P-----| pretimeout
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* |-----------------------T timeout
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* Watchdog: |-----------------P pretimeout_stage
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* |-----T timeout_stage
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/miscdevice.h>
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#include <linux/uaccess.h>
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#include <linux/watchdog.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/kempld.h>
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#define KEMPLD_WDT_STAGE_TIMEOUT(x) (0x1b + (x) * 4)
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#define KEMPLD_WDT_STAGE_CFG(x) (0x18 + (x))
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#define STAGE_CFG_GET_PRESCALER(x) (((x) & 0x30) >> 4)
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#define STAGE_CFG_SET_PRESCALER(x) (((x) & 0x30) << 4)
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#define STAGE_CFG_PRESCALER_MASK 0x30
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#define STAGE_CFG_ACTION_MASK 0x7
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#define STAGE_CFG_ASSERT (1 << 3)
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#define KEMPLD_WDT_MAX_STAGES 2
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#define KEMPLD_WDT_KICK 0x16
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#define KEMPLD_WDT_CFG 0x17
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#define KEMPLD_WDT_CFG_ENABLE 0x10
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#define KEMPLD_WDT_CFG_ENABLE_LOCK 0x8
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#define KEMPLD_WDT_CFG_GLOBAL_LOCK 0x80
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enum {
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ACTION_NONE = 0,
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ACTION_RESET,
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ACTION_NMI,
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ACTION_SMI,
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ACTION_SCI,
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ACTION_DELAY,
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};
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enum {
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STAGE_TIMEOUT = 0,
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STAGE_PRETIMEOUT,
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};
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enum {
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PRESCALER_21 = 0,
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PRESCALER_17,
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PRESCALER_12,
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};
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const u32 kempld_prescaler[] = {
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[PRESCALER_21] = (1 << 21) - 1,
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[PRESCALER_17] = (1 << 17) - 1,
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[PRESCALER_12] = (1 << 12) - 1,
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0,
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};
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struct kempld_wdt_stage {
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unsigned int id;
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u32 mask;
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};
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struct kempld_wdt_data {
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struct kempld_device_data *pld;
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struct watchdog_device wdd;
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unsigned int pretimeout;
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struct kempld_wdt_stage stage[KEMPLD_WDT_MAX_STAGES];
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#ifdef CONFIG_PM
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u8 pm_status_store;
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#endif
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};
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#define DEFAULT_TIMEOUT 30 /* seconds */
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#define DEFAULT_PRETIMEOUT 0
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static unsigned int timeout = DEFAULT_TIMEOUT;
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module_param(timeout, uint, 0);
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MODULE_PARM_DESC(timeout,
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"Watchdog timeout in seconds. (>=0, default="
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__MODULE_STRING(DEFAULT_TIMEOUT) ")");
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static unsigned int pretimeout = DEFAULT_PRETIMEOUT;
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module_param(pretimeout, uint, 0);
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MODULE_PARM_DESC(pretimeout,
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"Watchdog pretimeout in seconds. (>=0, default="
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__MODULE_STRING(DEFAULT_PRETIMEOUT) ")");
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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,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static int kempld_wdt_set_stage_action(struct kempld_wdt_data *wdt_data,
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struct kempld_wdt_stage *stage,
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u8 action)
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{
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struct kempld_device_data *pld = wdt_data->pld;
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u8 stage_cfg;
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if (!stage || !stage->mask)
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return -EINVAL;
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kempld_get_mutex(pld);
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stage_cfg = kempld_read8(pld, KEMPLD_WDT_STAGE_CFG(stage->id));
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stage_cfg &= ~STAGE_CFG_ACTION_MASK;
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stage_cfg |= (action & STAGE_CFG_ACTION_MASK);
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if (action == ACTION_RESET)
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stage_cfg |= STAGE_CFG_ASSERT;
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else
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stage_cfg &= ~STAGE_CFG_ASSERT;
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kempld_write8(pld, KEMPLD_WDT_STAGE_CFG(stage->id), stage_cfg);
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kempld_release_mutex(pld);
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return 0;
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}
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static int kempld_wdt_set_stage_timeout(struct kempld_wdt_data *wdt_data,
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struct kempld_wdt_stage *stage,
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unsigned int timeout)
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{
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struct kempld_device_data *pld = wdt_data->pld;
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u32 prescaler = kempld_prescaler[PRESCALER_21];
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u64 stage_timeout64;
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u32 stage_timeout;
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u32 remainder;
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u8 stage_cfg;
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if (!stage)
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return -EINVAL;
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stage_timeout64 = (u64)timeout * pld->pld_clock;
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remainder = do_div(stage_timeout64, prescaler);
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if (remainder)
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stage_timeout64++;
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if (stage_timeout64 > stage->mask)
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return -EINVAL;
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stage_timeout = stage_timeout64 & stage->mask;
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kempld_get_mutex(pld);
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stage_cfg = kempld_read8(pld, KEMPLD_WDT_STAGE_CFG(stage->id));
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stage_cfg &= ~STAGE_CFG_PRESCALER_MASK;
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stage_cfg |= STAGE_CFG_SET_PRESCALER(prescaler);
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kempld_write8(pld, KEMPLD_WDT_STAGE_CFG(stage->id), stage_cfg);
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kempld_write32(pld, KEMPLD_WDT_STAGE_TIMEOUT(stage->id),
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stage_timeout);
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kempld_release_mutex(pld);
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return 0;
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}
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/*
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* kempld_get_mutex must be called prior to calling this function.
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*/
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static unsigned int kempld_wdt_get_timeout(struct kempld_wdt_data *wdt_data,
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struct kempld_wdt_stage *stage)
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{
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struct kempld_device_data *pld = wdt_data->pld;
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unsigned int timeout;
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u64 stage_timeout;
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u32 prescaler;
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u32 remainder;
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u8 stage_cfg;
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if (!stage->mask)
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return 0;
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stage_cfg = kempld_read8(pld, KEMPLD_WDT_STAGE_CFG(stage->id));
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stage_timeout = kempld_read32(pld, KEMPLD_WDT_STAGE_TIMEOUT(stage->id));
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prescaler = kempld_prescaler[STAGE_CFG_GET_PRESCALER(stage_cfg)];
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stage_timeout = (stage_timeout & stage->mask) * prescaler;
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remainder = do_div(stage_timeout, pld->pld_clock);
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if (remainder)
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stage_timeout++;
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timeout = stage_timeout;
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WARN_ON_ONCE(timeout != stage_timeout);
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return timeout;
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}
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static int kempld_wdt_set_timeout(struct watchdog_device *wdd,
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unsigned int timeout)
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{
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struct kempld_wdt_data *wdt_data = watchdog_get_drvdata(wdd);
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struct kempld_wdt_stage *pretimeout_stage;
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struct kempld_wdt_stage *timeout_stage;
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int ret;
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timeout_stage = &wdt_data->stage[STAGE_TIMEOUT];
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pretimeout_stage = &wdt_data->stage[STAGE_PRETIMEOUT];
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if (pretimeout_stage->mask && wdt_data->pretimeout > 0)
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timeout = wdt_data->pretimeout;
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ret = kempld_wdt_set_stage_action(wdt_data, timeout_stage,
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ACTION_RESET);
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if (ret)
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return ret;
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ret = kempld_wdt_set_stage_timeout(wdt_data, timeout_stage,
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timeout);
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if (ret)
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return ret;
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wdd->timeout = timeout;
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return 0;
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}
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static int kempld_wdt_set_pretimeout(struct watchdog_device *wdd,
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unsigned int pretimeout)
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{
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struct kempld_wdt_data *wdt_data = watchdog_get_drvdata(wdd);
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struct kempld_wdt_stage *pretimeout_stage;
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u8 action = ACTION_NONE;
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int ret;
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pretimeout_stage = &wdt_data->stage[STAGE_PRETIMEOUT];
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if (!pretimeout_stage->mask)
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return -ENXIO;
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if (pretimeout > wdd->timeout)
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return -EINVAL;
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if (pretimeout > 0)
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action = ACTION_NMI;
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ret = kempld_wdt_set_stage_action(wdt_data, pretimeout_stage,
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action);
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if (ret)
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return ret;
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ret = kempld_wdt_set_stage_timeout(wdt_data, pretimeout_stage,
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wdd->timeout - pretimeout);
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if (ret)
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return ret;
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wdt_data->pretimeout = pretimeout;
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return 0;
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}
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static void kempld_wdt_update_timeouts(struct kempld_wdt_data *wdt_data)
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{
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struct kempld_device_data *pld = wdt_data->pld;
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struct kempld_wdt_stage *pretimeout_stage;
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struct kempld_wdt_stage *timeout_stage;
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unsigned int pretimeout, timeout;
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pretimeout_stage = &wdt_data->stage[STAGE_PRETIMEOUT];
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timeout_stage = &wdt_data->stage[STAGE_TIMEOUT];
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kempld_get_mutex(pld);
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pretimeout = kempld_wdt_get_timeout(wdt_data, pretimeout_stage);
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timeout = kempld_wdt_get_timeout(wdt_data, timeout_stage);
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kempld_release_mutex(pld);
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if (pretimeout)
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wdt_data->pretimeout = timeout;
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else
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wdt_data->pretimeout = 0;
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wdt_data->wdd.timeout = pretimeout + timeout;
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}
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static int kempld_wdt_start(struct watchdog_device *wdd)
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{
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struct kempld_wdt_data *wdt_data = watchdog_get_drvdata(wdd);
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struct kempld_device_data *pld = wdt_data->pld;
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u8 status;
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int ret;
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ret = kempld_wdt_set_timeout(wdd, wdd->timeout);
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if (ret)
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return ret;
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kempld_get_mutex(pld);
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status = kempld_read8(pld, KEMPLD_WDT_CFG);
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status |= KEMPLD_WDT_CFG_ENABLE;
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kempld_write8(pld, KEMPLD_WDT_CFG, status);
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status = kempld_read8(pld, KEMPLD_WDT_CFG);
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kempld_release_mutex(pld);
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/* Check if the watchdog was enabled */
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if (!(status & KEMPLD_WDT_CFG_ENABLE))
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return -EACCES;
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return 0;
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}
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static int kempld_wdt_stop(struct watchdog_device *wdd)
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{
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struct kempld_wdt_data *wdt_data = watchdog_get_drvdata(wdd);
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struct kempld_device_data *pld = wdt_data->pld;
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u8 status;
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kempld_get_mutex(pld);
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status = kempld_read8(pld, KEMPLD_WDT_CFG);
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status &= ~KEMPLD_WDT_CFG_ENABLE;
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kempld_write8(pld, KEMPLD_WDT_CFG, status);
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status = kempld_read8(pld, KEMPLD_WDT_CFG);
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kempld_release_mutex(pld);
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/* Check if the watchdog was disabled */
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if (status & KEMPLD_WDT_CFG_ENABLE)
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return -EACCES;
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return 0;
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}
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static int kempld_wdt_keepalive(struct watchdog_device *wdd)
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{
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struct kempld_wdt_data *wdt_data = watchdog_get_drvdata(wdd);
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struct kempld_device_data *pld = wdt_data->pld;
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kempld_get_mutex(pld);
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kempld_write8(pld, KEMPLD_WDT_KICK, 'K');
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kempld_release_mutex(pld);
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return 0;
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}
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static long kempld_wdt_ioctl(struct watchdog_device *wdd, unsigned int cmd,
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unsigned long arg)
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{
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struct kempld_wdt_data *wdt_data = watchdog_get_drvdata(wdd);
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void __user *argp = (void __user *)arg;
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int ret = -ENOIOCTLCMD;
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int __user *p = argp;
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int new_value;
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switch (cmd) {
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case WDIOC_SETPRETIMEOUT:
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if (get_user(new_value, p))
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return -EFAULT;
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ret = kempld_wdt_set_pretimeout(wdd, new_value);
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if (ret)
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return ret;
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ret = kempld_wdt_keepalive(wdd);
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break;
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case WDIOC_GETPRETIMEOUT:
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ret = put_user(wdt_data->pretimeout, (int *)arg);
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break;
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}
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return ret;
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}
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static int kempld_wdt_probe_stages(struct watchdog_device *wdd)
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{
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struct kempld_wdt_data *wdt_data = watchdog_get_drvdata(wdd);
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struct kempld_device_data *pld = wdt_data->pld;
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struct kempld_wdt_stage *pretimeout_stage;
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struct kempld_wdt_stage *timeout_stage;
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u8 index, data, data_orig;
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u32 mask;
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int i, j;
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pretimeout_stage = &wdt_data->stage[STAGE_PRETIMEOUT];
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timeout_stage = &wdt_data->stage[STAGE_TIMEOUT];
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pretimeout_stage->mask = 0;
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timeout_stage->mask = 0;
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for (i = 0; i < 3; i++) {
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index = KEMPLD_WDT_STAGE_TIMEOUT(i);
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mask = 0;
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kempld_get_mutex(pld);
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/* Probe each byte individually. */
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for (j = 0; j < 4; j++) {
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data_orig = kempld_read8(pld, index + j);
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kempld_write8(pld, index + j, 0x00);
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data = kempld_read8(pld, index + j);
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/* A failed write means this byte is reserved */
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if (data != 0x00)
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break;
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kempld_write8(pld, index + j, data_orig);
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mask |= 0xff << (j * 8);
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}
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kempld_release_mutex(pld);
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/* Assign available stages to timeout and pretimeout */
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if (!timeout_stage->mask) {
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timeout_stage->mask = mask;
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timeout_stage->id = i;
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} else {
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if (pld->feature_mask & KEMPLD_FEATURE_BIT_NMI) {
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pretimeout_stage->mask = timeout_stage->mask;
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timeout_stage->mask = mask;
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pretimeout_stage->id = timeout_stage->id;
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timeout_stage->id = i;
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}
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break;
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}
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}
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if (!timeout_stage->mask)
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return -ENODEV;
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return 0;
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}
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static struct watchdog_info kempld_wdt_info = {
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.identity = "KEMPLD Watchdog",
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.options = WDIOF_SETTIMEOUT |
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WDIOF_KEEPALIVEPING |
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WDIOF_MAGICCLOSE |
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WDIOF_PRETIMEOUT
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};
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static struct watchdog_ops kempld_wdt_ops = {
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.owner = THIS_MODULE,
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.start = kempld_wdt_start,
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.stop = kempld_wdt_stop,
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.ping = kempld_wdt_keepalive,
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.set_timeout = kempld_wdt_set_timeout,
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.ioctl = kempld_wdt_ioctl,
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};
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static int kempld_wdt_probe(struct platform_device *pdev)
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{
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struct kempld_device_data *pld = dev_get_drvdata(pdev->dev.parent);
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struct kempld_wdt_data *wdt_data;
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struct device *dev = &pdev->dev;
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struct watchdog_device *wdd;
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u8 status;
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int ret = 0;
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wdt_data = devm_kzalloc(dev, sizeof(*wdt_data), GFP_KERNEL);
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if (!wdt_data)
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return -ENOMEM;
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wdt_data->pld = pld;
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wdd = &wdt_data->wdd;
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wdd->parent = dev;
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kempld_get_mutex(pld);
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status = kempld_read8(pld, KEMPLD_WDT_CFG);
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kempld_release_mutex(pld);
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/* Enable nowayout if watchdog is already locked */
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if (status & (KEMPLD_WDT_CFG_ENABLE_LOCK |
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KEMPLD_WDT_CFG_GLOBAL_LOCK)) {
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if (!nowayout)
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dev_warn(dev,
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"Forcing nowayout - watchdog lock enabled!\n");
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nowayout = true;
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}
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wdd->info = &kempld_wdt_info;
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wdd->ops = &kempld_wdt_ops;
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watchdog_set_drvdata(wdd, wdt_data);
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watchdog_set_nowayout(wdd, nowayout);
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ret = kempld_wdt_probe_stages(wdd);
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if (ret)
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return ret;
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kempld_wdt_set_timeout(wdd, timeout);
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kempld_wdt_set_pretimeout(wdd, pretimeout);
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|
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/* Check if watchdog is already enabled */
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if (status & KEMPLD_WDT_CFG_ENABLE) {
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/* Get current watchdog settings */
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kempld_wdt_update_timeouts(wdt_data);
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dev_info(dev, "Watchdog was already enabled\n");
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}
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platform_set_drvdata(pdev, wdt_data);
|
|
ret = watchdog_register_device(wdd);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dev_info(dev, "Watchdog registered with %ds timeout\n", wdd->timeout);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void kempld_wdt_shutdown(struct platform_device *pdev)
|
|
{
|
|
struct kempld_wdt_data *wdt_data = platform_get_drvdata(pdev);
|
|
|
|
kempld_wdt_stop(&wdt_data->wdd);
|
|
}
|
|
|
|
static int kempld_wdt_remove(struct platform_device *pdev)
|
|
{
|
|
struct kempld_wdt_data *wdt_data = platform_get_drvdata(pdev);
|
|
struct watchdog_device *wdd = &wdt_data->wdd;
|
|
int ret = 0;
|
|
|
|
if (!nowayout)
|
|
ret = kempld_wdt_stop(wdd);
|
|
watchdog_unregister_device(wdd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
/* Disable watchdog if it is active during suspend */
|
|
static int kempld_wdt_suspend(struct platform_device *pdev,
|
|
pm_message_t message)
|
|
{
|
|
struct kempld_wdt_data *wdt_data = platform_get_drvdata(pdev);
|
|
struct kempld_device_data *pld = wdt_data->pld;
|
|
struct watchdog_device *wdd = &wdt_data->wdd;
|
|
|
|
kempld_get_mutex(pld);
|
|
wdt_data->pm_status_store = kempld_read8(pld, KEMPLD_WDT_CFG);
|
|
kempld_release_mutex(pld);
|
|
|
|
kempld_wdt_update_timeouts(wdt_data);
|
|
|
|
if (wdt_data->pm_status_store & KEMPLD_WDT_CFG_ENABLE)
|
|
return kempld_wdt_stop(wdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Enable watchdog and configure it if necessary */
|
|
static int kempld_wdt_resume(struct platform_device *pdev)
|
|
{
|
|
struct kempld_wdt_data *wdt_data = platform_get_drvdata(pdev);
|
|
struct watchdog_device *wdd = &wdt_data->wdd;
|
|
|
|
/*
|
|
* If watchdog was stopped before suspend be sure it gets disabled
|
|
* again, for the case BIOS has enabled it during resume
|
|
*/
|
|
if (wdt_data->pm_status_store & KEMPLD_WDT_CFG_ENABLE)
|
|
return kempld_wdt_start(wdd);
|
|
else
|
|
return kempld_wdt_stop(wdd);
|
|
}
|
|
#else
|
|
#define kempld_wdt_suspend NULL
|
|
#define kempld_wdt_resume NULL
|
|
#endif
|
|
|
|
static struct platform_driver kempld_wdt_driver = {
|
|
.driver = {
|
|
.name = "kempld-wdt",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = kempld_wdt_probe,
|
|
.remove = kempld_wdt_remove,
|
|
.shutdown = kempld_wdt_shutdown,
|
|
.suspend = kempld_wdt_suspend,
|
|
.resume = kempld_wdt_resume,
|
|
};
|
|
|
|
module_platform_driver(kempld_wdt_driver);
|
|
|
|
MODULE_DESCRIPTION("KEM PLD Watchdog Driver");
|
|
MODULE_AUTHOR("Michael Brunner <michael.brunner@kontron.com>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|