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Subject[PATCH 19/23] mfd/db5500-prcmu: implement reset and cause
Date
From: Pawel Szyszuk <pawel.szyszuk@stericsson.com>

This implements the reset accessor function so that the DB5500
PRCMU can reset the system, and the corresponding accessor
to retrieve the cause of reset after a restart.

Signed-off-by: Pawel Szyszuk <pawel.szyszuk@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
drivers/mfd/db5500-prcmu.c | 25 +++++++++++++++++++++++++
1 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/db5500-prcmu.c b/drivers/mfd/db5500-prcmu.c
index 35a7a0c..60bfda2 100644
--- a/drivers/mfd/db5500-prcmu.c
+++ b/drivers/mfd/db5500-prcmu.c
@@ -27,6 +27,8 @@
#include <mach/db5500-regs.h>
#include "dbx500-prcmu-regs.h"

+#define PRCM_SW_RST_REASON (tcdm_base + 0xFF8) /* 2 bytes */
+
#define _PRCM_MB_HEADER (tcdm_base + 0xFE8)
#define PRCM_REQ_MB0_HEADER (_PRCM_MB_HEADER + 0x0)
#define PRCM_REQ_MB1_HEADER (_PRCM_MB_HEADER + 0x1)
@@ -957,6 +959,29 @@ int db5500_prcmu_set_display_clocks(void)
return 0;
}

+/**
+ * db5500_prcmu_system_reset - System reset
+ *
+ * Saves the reset reason code and then sets the APE_SOFTRST register which
+ * fires an interrupt to fw
+ */
+void db5500_prcmu_system_reset(u16 reset_code)
+{
+ writew(reset_code, PRCM_SW_RST_REASON);
+ writel(1, PRCM_APE_SOFTRST);
+}
+
+/**
+ * db5500_prcmu_get_reset_code - Retrieve SW reset reason code
+ *
+ * Retrieves the reset reason code stored by prcmu_system_reset() before
+ * last restart.
+ */
+u16 db5500_prcmu_get_reset_code(void)
+{
+ return readw(PRCM_SW_RST_REASON);
+}
+
static void ack_dbb_wakeup(void)
{
unsigned long flags;
--
1.7.3.2


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