diff options
Diffstat (limited to 'drivers/mfd/db8500-prcmu.c')
| -rw-r--r-- | drivers/mfd/db8500-prcmu.c | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c index 536566a890d..186206daab7 100644 --- a/drivers/mfd/db8500-prcmu.c +++ b/drivers/mfd/db8500-prcmu.c @@ -426,6 +426,13 @@ static DEFINE_SPINLOCK(clkout_lock); /* Global var to runtime determine TCDM base for v2 or v1 */ static __iomem void *tcdm_base; +/* + * Copies of the startup values of the reset status register and the SW reset + * code. + */ +static u32 reset_status_copy; +static u16 reset_code_copy; + struct clk_mgt { void __iomem *reg; u32 pllsw; @@ -2404,7 +2411,17 @@ void db8500_prcmu_system_reset(u16 reset_code) */ u16 db8500_prcmu_get_reset_code(void) { - return readw(tcdm_base + PRCM_SW_RST_REASON); + return reset_code_copy; +} + +/** + * db8500_prcmu_get_reset_status - Retrieve reset status + * + * Retrieves the value of the reset status register as read at startup. + */ +u32 db8500_prcmu_get_reset_status(void) +{ + return reset_status_copy; } /** @@ -2689,6 +2706,7 @@ void __init db8500_prcmu_early_init(void) { unsigned int i; void *tcpm_base = ioremap_nocache(U8500_PRCMU_TCPM_BASE, SZ_4K); + void __iomem *sec_base; if (tcpm_base != NULL) { u32 version; @@ -2707,6 +2725,19 @@ void __init db8500_prcmu_early_init(void) tcdm_base = __io_address(U8500_PRCMU_TCDM_BASE); + /* + * Copy the value of the reset status register and if needed also + * the software reset code. + */ + sec_base = ioremap_nocache(U8500_PRCMU_SEC_BASE, SZ_4K); + if (sec_base != NULL) { + reset_status_copy = readl(sec_base + + DB8500_SEC_PRCM_RESET_STATUS); + iounmap(sec_base); + } + if (reset_status_copy & DB8500_SEC_PRCM_RESET_STATUS_APE_SOFTWARE_RESET) + reset_code_copy = readw(tcdm_base + PRCM_SW_RST_REASON); + spin_lock_init(&mb0_transfer.lock); spin_lock_init(&mb0_transfer.dbb_irqs_lock); mutex_init(&mb0_transfer.ac_wake_lock); |