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Commit 84165b80 authored by Jonas Aberg's avatar Jonas Aberg Committed by Samuel Ortiz
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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: default avatarJonas Aberg <jonas.aberg@stericsson.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 0b9199e3

drivers/mfd/db8500-prcmu.c

+72 −0
Original line number Diff line number Diff line
@@ -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.