diff options
| author | Pawel Szyszuk <pawel.szyszuk@stericsson.com> | 2011-08-11 11:36:25 +0200 |
|---|---|---|
| committer | Philippe Langlais <philippe.langlais@stericsson.com> | 2012-05-22 10:59:04 +0200 |
| commit | d88a8f7366fc842f818e8861c82ee120670e8a7f (patch) | |
| tree | d04d0127f2e993c55083830f307f2cc7af31c72b /drivers/mfd | |
| parent | 42836cec139354aca999205b82fbc6f010645a70 (diff) | |
mfd/db5500-prcmu: implement reset and cause
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>
Diffstat (limited to 'drivers/mfd')
| -rw-r--r-- | 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 35a7a0c74a1..60bfda292ab 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; |