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tegra: pmc: add support for reset src detection 

Also activate in defconfig.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Lucas Stach 2014-10-20 20:15:30 +02:00 committed by Sascha Hauer
parent f63a42a999
commit 1834169f13
3 changed files with 42 additions and 0 deletions
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1
arch/arm/configs/tegra_v7_defconfig
View File

@ -16,6 +16,7 @@ CONFIG_AUTO_COMPLETE=y
CONFIG_MENU=y
CONFIG_BLSPEC=y
CONFIG_DEFAULT_ENVIRONMENT_GENERIC_NEW=y
CONFIG_RESET_SOURCE=y
CONFIG_LONGHELP=y
CONFIG_CMD_IOMEM=y
CONFIG_CMD_MEMINFO=y

9
arch/arm/mach-tegra/include/mach/tegra20-pmc.h
View File

@ -71,3 +71,12 @@
#define PMC_PARTID_C0NC 15
#define PMC_SCRATCH(i) (0x050 + 0x4*i)
#define PMC_RST_STATUS 0x1b4
#define PMC_RST_STATUS_RST_SRC_SHIFT 0
#define PMC_RST_STATUS_RST_SRC_MASK (0x7 << PMC_RST_STATUS_RST_SRC_SHIFT)
#define PMC_RST_STATUS_RST_SRC_POR 0
#define PMC_RST_STATUS_RST_SRC_WATCHDOG 1
#define PMC_RST_STATUS_RST_SRC_SENSOR 2
#define PMC_RST_STATUS_RST_SRC_SW_MAIN 3
#define PMC_RST_STATUS_RST_SRC_LP0 4

32
arch/arm/mach-tegra/tegra20-pmc.c
View File

@ -28,6 +28,8 @@
#include <linux/reset.h>
#include <mach/lowlevel.h>
#include <mach/tegra-powergate.h>
#include <reset_source.h>
#include <mach/tegra20-pmc.h>
static void __iomem *pmc_base;
@ -171,6 +173,33 @@ static int tegra_powergate_init(void)
return 0;
}
static void tegra20_pmc_detect_reset_cause(void)
{
u32 reg = readl(pmc_base + PMC_RST_STATUS);
switch ((reg & PMC_RST_STATUS_RST_SRC_MASK) >>
PMC_RST_STATUS_RST_SRC_SHIFT) {
case PMC_RST_STATUS_RST_SRC_POR:
reset_source_set(RESET_POR);
break;
case PMC_RST_STATUS_RST_SRC_WATCHDOG:
reset_source_set(RESET_WDG);
break;
case PMC_RST_STATUS_RST_SRC_LP0:
reset_source_set(RESET_WKE);
break;
case PMC_RST_STATUS_RST_SRC_SW_MAIN:
reset_source_set(RESET_RST);
break;
case PMC_RST_STATUS_RST_SRC_SENSOR:
reset_source_set(RESET_THERM);
break;
default:
reset_source_set(RESET_UKWN);
break;
}
}
static int tegra20_pmc_probe(struct device_d *dev)
{
pmc_base = dev_request_mem_region(dev, 0);
@ -181,6 +210,9 @@ static int tegra20_pmc_probe(struct device_d *dev)
tegra_powergate_init();
if (IS_ENABLED(CONFIG_RESET_SOURCE))
tegra20_pmc_detect_reset_cause();
return 0;
}