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mfd: Add db8500-pcmu watchdog accessor functions for watchdog 

This implements the watchdog accessor functions for the DB8500
PRCMU, making it possible to implement the watchdog driver.

Signed-off-by: Jonas Aberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Jonas Aberg 2011-08-12 10:28:33 +02:00 committed by Samuel Ortiz
parent 0b9199e318
commit 84165b8059
1 changed files with 72 additions and 0 deletions
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72
drivers/mfd/db8500-prcmu.c
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@ -1543,6 +1543,78 @@ int prcmu_stop_temp_sense(void)
return config_hot_period(0xFFFF);
}
static int prcmu_a9wdog(u8 cmd, u8 d0, u8 d1, u8 d2, u8 d3)
{
mutex_lock(&mb4_transfer.lock);
while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(4))
cpu_relax();
writeb(d0, (tcdm_base + PRCM_REQ_MB4_A9WDOG_0));
writeb(d1, (tcdm_base + PRCM_REQ_MB4_A9WDOG_1));
writeb(d2, (tcdm_base + PRCM_REQ_MB4_A9WDOG_2));
writeb(d3, (tcdm_base + PRCM_REQ_MB4_A9WDOG_3));
writeb(cmd, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB4));
writel(MBOX_BIT(4), PRCM_MBOX_CPU_SET);
wait_for_completion(&mb4_transfer.work);
mutex_unlock(&mb4_transfer.lock);
return 0;
}
int prcmu_config_a9wdog(u8 num, bool sleep_auto_off)
{
BUG_ON(num == 0 || num > 0xf);
return prcmu_a9wdog(MB4H_A9WDOG_CONF, num, 0, 0,
sleep_auto_off ? A9WDOG_AUTO_OFF_EN :
A9WDOG_AUTO_OFF_DIS);
}
int prcmu_enable_a9wdog(u8 id)
{
return prcmu_a9wdog(MB4H_A9WDOG_EN, id, 0, 0, 0);
}
int prcmu_disable_a9wdog(u8 id)
{
return prcmu_a9wdog(MB4H_A9WDOG_DIS, id, 0, 0, 0);
}
int prcmu_kick_a9wdog(u8 id)
{
return prcmu_a9wdog(MB4H_A9WDOG_KICK, id, 0, 0, 0);
}
/*
* timeout is 28 bit, in ms.
*/
#define MAX_WATCHDOG_TIMEOUT 131000
int prcmu_load_a9wdog(u8 id, u32 timeout)
{
if (timeout > MAX_WATCHDOG_TIMEOUT)
/*
* Due to calculation bug in prcmu fw, timeouts
* can't be bigger than 131 seconds.
*/
return -EINVAL;
return prcmu_a9wdog(MB4H_A9WDOG_LOAD,
(id & A9WDOG_ID_MASK) |
/*
* Put the lowest 28 bits of timeout at
* offset 4. Four first bits are used for id.
*/
(u8)((timeout << 4) & 0xf0),
(u8)((timeout >> 4) & 0xff),
(u8)((timeout >> 12) & 0xff),
(u8)((timeout >> 20) & 0xff));
}
/**
* prcmu_set_clock_divider() - Configure the clock divider.
* @clock: The clock for which the request is made.