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Openbmc/wdt #5

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Openbmc/wdt #5

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d6ba1a3
watchdog/aspeed_wdt: Unify register names with the doc
jk-ozlabs Oct 22, 2015
0c67549
watchdog/aspeed_wdt: Move watchdog reset to a separate function
jk-ozlabs Oct 22, 2015
2f17119
watchdog/aspeed_wdt: Set system reset mode to 'full chip'
jk-ozlabs Oct 22, 2015
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44 changes: 24 additions & 20 deletions drivers/watchdog/aspeed_wdt.c
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Original file line number Diff line number Diff line change
Expand Up @@ -33,25 +33,33 @@ static const struct of_device_id aspeed_wdt_of_table[] = {
};
MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table);

#define WDT_STATUS 0x00
#define WDT_BITE_COUNT 0x04
#define WDT_RELOAD 0x08
#define WDT_CTRL 0x0C
#define WDT_STATUS 0x00
#define WDT_RELOAD_VALUE 0x04
#define WDT_RESTART 0x08
#define WDT_CTRL 0x0C
#define WDT_CTRL_RESET_MODE_FULL_CHIP (0x01 << 5)
#define WDT_CTRL_RESET_SYSTEM (0x1 << 1)
#define WDT_CTRL_ENABLE (0x1 << 0)

#define WDT_RELOAD_MAGIC 0x4755
#define WDT_RESTART_MAGIC 0x4755

static int aspeed_wdt_start(struct watchdog_device *wdd)
static void aspeed_wdt_enable(struct aspeed_wdt *wdt, int count)
{
struct aspeed_wdt *wdt = container_of(wdd, struct aspeed_wdt, wdd);
u32 ctrl = WDT_CTRL_RESET_MODE_FULL_CHIP | WDT_CTRL_RESET_SYSTEM |
WDT_CTRL_ENABLE;

writel(0, wdt->base + WDT_CTRL);
writel(wdd->timeout * wdt->rate, wdt->base + WDT_BITE_COUNT);
writel(WDT_RELOAD_MAGIC, wdt->base + WDT_RELOAD);
writel(3, wdt->base + WDT_CTRL);
writel(count, wdt->base + WDT_RELOAD_VALUE);
writel(WDT_RESTART_MAGIC, wdt->base + WDT_RESTART);
writel(ctrl, wdt->base + WDT_CTRL);
}

static int aspeed_wdt_start(struct watchdog_device *wdd)
{
struct aspeed_wdt *wdt = container_of(wdd, struct aspeed_wdt, wdd);
dev_dbg(wdd->dev, "starting with timeout of %d (rate %lu)\n",
wdd->timeout, wdt->rate);

aspeed_wdt_enable(wdt, wdd->timeout * wdt->rate);
return 0;
}

Expand All @@ -68,7 +76,7 @@ static int aspeed_wdt_ping(struct watchdog_device *wdd)
struct aspeed_wdt *wdt = container_of(wdd, struct aspeed_wdt, wdd);

dev_dbg(wdd->dev, "ping\n");
writel(WDT_RELOAD_MAGIC, wdt->base + WDT_RELOAD);
writel(WDT_RESTART_MAGIC, wdt->base + WDT_RESTART);
return 0;
}

Expand All @@ -83,19 +91,15 @@ static int aspeed_wdt_set_timeout(struct watchdog_device *wdd,
static int aspeed_wdt_restart(struct notifier_block *nb, unsigned long action,
void *data)
{
struct aspeed_wdt *wdt = container_of(nb, struct aspeed_wdt, restart_nb);
u32 timeout;
struct aspeed_wdt *wdt = container_of(nb,
struct aspeed_wdt, restart_nb);

/*
* Trigger watchdog bite:
* Setup BITE_TIME to be 128ms, and enable WDT.
* Setup reload count to be 128ms, and enable WDT.
*/
timeout = 128 * wdt->rate / 1000;
aspeed_wdt_enable(wdt, 128 * wdt->rate / 1000);

writel(0, wdt->base + WDT_CTRL);
writel(timeout, wdt->base + WDT_BITE_COUNT);
writel(WDT_RELOAD_MAGIC, wdt->base + WDT_RELOAD);
writel(3, wdt->base + WDT_CTRL);
return NOTIFY_DONE;
}

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