diff options
Diffstat (limited to 'drivers/power/reset/at91-reset.c')
| -rw-r--r-- | drivers/power/reset/at91-reset.c | 60 |
1 files changed, 37 insertions, 23 deletions
diff --git a/drivers/power/reset/at91-reset.c b/drivers/power/reset/at91-reset.c index 741e44a017c3..511f5a8f8961 100644 --- a/drivers/power/reset/at91-reset.c +++ b/drivers/power/reset/at91-reset.c @@ -18,6 +18,7 @@ #include <linux/platform_device.h> #include <linux/reboot.h> #include <linux/reset-controller.h> +#include <linux/power/power_on_reason.h> #include <soc/at91/at91sam9_ddrsdr.h> #include <soc/at91/at91sam9_sdramc.h> @@ -128,12 +129,11 @@ static int at91_reset(struct notifier_block *this, unsigned long mode, " str %4, [%0, %6]\n\t" /* Disable SDRAM1 accesses */ "1: tst %1, #0\n\t" - " beq 2f\n\t" " strne %3, [%1, #" __stringify(AT91_DDRSDRC_RTR) "]\n\t" /* Power down SDRAM1 */ " strne %4, [%1, %6]\n\t" /* Reset CPU */ - "2: str %5, [%2, #" __stringify(AT91_RSTC_CR) "]\n\t" + " str %5, [%2, #" __stringify(AT91_RSTC_CR) "]\n\t" " b .\n\t" : @@ -144,50 +144,59 @@ static int at91_reset(struct notifier_block *this, unsigned long mode, "r" cpu_to_le32(AT91_DDRSDRC_LPCB_POWER_DOWN), "r" (reset->data->reset_args), "r" (reset->ramc_lpr) - : "r4"); + ); return NOTIFY_DONE; } -static void __init at91_reset_status(struct platform_device *pdev, - void __iomem *base) +static const char *at91_reset_reason(struct at91_reset *reset) { + u32 reg = readl(reset->rstc_base + AT91_RSTC_SR); const char *reason; - u32 reg = readl(base + AT91_RSTC_SR); switch ((reg & AT91_RSTC_RSTTYP) >> 8) { case RESET_TYPE_GENERAL: - reason = "general reset"; + reason = POWER_ON_REASON_REGULAR; break; case RESET_TYPE_WAKEUP: - reason = "wakeup"; + reason = POWER_ON_REASON_RTC; break; case RESET_TYPE_WATCHDOG: - reason = "watchdog reset"; + reason = POWER_ON_REASON_WATCHDOG; break; case RESET_TYPE_SOFTWARE: - reason = "software reset"; + reason = POWER_ON_REASON_SOFTWARE; break; case RESET_TYPE_USER: - reason = "user reset"; + reason = POWER_ON_REASON_RST_BTN; break; case RESET_TYPE_CPU_FAIL: - reason = "CPU clock failure detection"; + reason = POWER_ON_REASON_CPU_CLK_FAIL; break; case RESET_TYPE_XTAL_FAIL: - reason = "32.768 kHz crystal failure detection"; + reason = POWER_ON_REASON_XTAL_FAIL; break; case RESET_TYPE_ULP2: - reason = "ULP2 reset"; + reason = POWER_ON_REASON_BROWN_OUT; break; default: - reason = "unknown reset"; + reason = POWER_ON_REASON_UNKNOWN; break; } - dev_info(&pdev->dev, "Starting after %s\n", reason); + return reason; } +static ssize_t power_on_reason_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + struct at91_reset *reset = platform_get_drvdata(pdev); + + return sprintf(buf, "%s\n", at91_reset_reason(reset)); +} +static DEVICE_ATTR_RO(power_on_reason); + static const struct of_device_id at91_ramc_of_match[] = { { .compatible = "atmel,at91sam9260-sdramc", @@ -327,7 +336,7 @@ static int at91_rcdev_init(struct at91_reset *reset, return devm_reset_controller_register(&pdev->dev, &reset->rcdev); } -static int __init at91_reset_probe(struct platform_device *pdev) +static int at91_reset_probe(struct platform_device *pdev) { const struct of_device_id *match; struct at91_reset *reset; @@ -392,7 +401,13 @@ static int __init at91_reset_probe(struct platform_device *pdev) if (ret) goto disable_clk; - at91_reset_status(pdev, reset->rstc_base); + ret = device_create_file(&pdev->dev, &dev_attr_power_on_reason); + if (ret) { + dev_err(&pdev->dev, "Could not create sysfs entry\n"); + return ret; + } + + dev_info(&pdev->dev, "Starting after %s\n", at91_reset_reason(reset)); return 0; @@ -401,24 +416,23 @@ disable_clk: return ret; } -static int __exit at91_reset_remove(struct platform_device *pdev) +static void at91_reset_remove(struct platform_device *pdev) { struct at91_reset *reset = platform_get_drvdata(pdev); unregister_restart_handler(&reset->nb); clk_disable_unprepare(reset->sclk); - - return 0; } static struct platform_driver at91_reset_driver = { - .remove = __exit_p(at91_reset_remove), + .probe = at91_reset_probe, + .remove = at91_reset_remove, .driver = { .name = "at91-reset", .of_match_table = at91_reset_of_match, }, }; -module_platform_driver_probe(at91_reset_driver, at91_reset_probe); +module_platform_driver(at91_reset_driver); MODULE_AUTHOR("Atmel Corporation"); MODULE_DESCRIPTION("Reset driver for Atmel SoCs"); |