diff options
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/Kconfig | 20 | ||||
| -rw-r--r-- | drivers/watchdog/Makefile | 1 | ||||
| -rw-r--r-- | drivers/watchdog/booke_wdt.c | 106 | ||||
| -rw-r--r-- | drivers/watchdog/designware_wdt.c | 37 | ||||
| -rw-r--r-- | drivers/watchdog/imx_watchdog.c | 2 | ||||
| -rw-r--r-- | drivers/watchdog/ulp_wdog.c | 2 | ||||
| -rw-r--r-- | drivers/watchdog/wdt-uclass.c | 28 |
7 files changed, 177 insertions, 19 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 602ccbe41c0..f0ff2612a6b 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -9,6 +9,19 @@ config WATCHDOG this option if you want to service enabled watchdog by U-Boot. Disable this option if you want U-Boot to start watchdog but never service it. +config WATCHDOG_AUTOSTART + bool "Automatically start watchdog timer" + depends on WDT + default y + help + Automatically start watchdog timer and start servicing it during + init phase. Enabled by default. Disable this option if you want + to compile U-Boot with CONFIG_WDT support but do not want to + activate watchdog, like when CONFIG_WDT option is disabled. You + would be able to start watchdog manually by 'wdt' command. Useful + when you want to have support for 'wdt' command but do not want + to have watchdog enabled by default. + config WATCHDOG_TIMEOUT_MSECS int "Watchdog timeout in msec" default 128000 if ARCH_MX25 || ARCH_MX31 || ARCH_MX5 || ARCH_MX6 @@ -111,6 +124,13 @@ config WDT_BCM6345 The watchdog timer is stopped when initialized. It performs full SoC reset. +config WDT_BOOKE + bool "PowerPC Book-E watchdog driver" + depends on WDT && MPC85xx + help + Watchdog driver for PowerPC Book-E chips, such as the Freescale + MPC85xx SOCs and the IBM PowerPC 440. + config WDT_CDNS bool "Cadence watchdog timer support" depends on WDT diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 6e70c7ae19c..5c7ef593fe5 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_WDT_ARMADA_37XX) += armada-37xx-wdt.o obj-$(CONFIG_WDT_ASPEED) += ast_wdt.o obj-$(CONFIG_WDT_AST2600) += ast2600_wdt.o obj-$(CONFIG_WDT_BCM6345) += bcm6345_wdt.o +obj-$(CONFIG_WDT_BOOKE) += booke_wdt.o obj-$(CONFIG_WDT_CORTINA) += cortina_wdt.o obj-$(CONFIG_WDT_ORION) += orion_wdt.o obj-$(CONFIG_WDT_CDNS) += cdns_wdt.o diff --git a/drivers/watchdog/booke_wdt.c b/drivers/watchdog/booke_wdt.c new file mode 100644 index 00000000000..50c091956e7 --- /dev/null +++ b/drivers/watchdog/booke_wdt.c @@ -0,0 +1,106 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Watchdog timer for PowerPC Book-E systems + */ + +#include <div64.h> +#include <dm.h> +#include <wdt.h> +#include <asm/processor.h> + +#define WDTP_MASK TCR_WP(0x3f) + +/* For the specified period, determine the number of seconds + * corresponding to the reset time. There will be a watchdog + * exception at approximately 3/5 of this time. + * + * The formula to calculate this is given by: + * 2.5 * (2^(63-period+1)) / timebase_freq + * + * In order to simplify things, we assume that period is + * at least 1. This will still result in a very long timeout. + */ +static unsigned long long period_to_sec(unsigned int period) +{ + unsigned long long tmp = 1ULL << (64 - period); + unsigned long tmp2 = get_tbclk(); + + /* tmp may be a very large number and we don't want to overflow, + * so divide the timebase freq instead of multiplying tmp + */ + tmp2 = tmp2 / 5 * 2; + + do_div(tmp, tmp2); + return tmp; +} + +/* + * This procedure will find the highest period which will give a timeout + * greater than the one required. e.g. for a bus speed of 66666666 and + * and a parameter of 2 secs, then this procedure will return a value of 38. + */ +static unsigned int sec_to_period(unsigned int secs) +{ + unsigned int period; + + for (period = 63; period > 0; period--) { + if (period_to_sec(period) >= secs) + return period; + } + return 0; +} + +static int booke_wdt_reset(struct udevice *dev) +{ + mtspr(SPRN_TSR, TSR_ENW | TSR_WIS); + + return 0; +} + +static int booke_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags) +{ + u32 val; + unsigned int timeout = DIV_ROUND_UP(timeout_ms, 1000); + + /* clear status before enabling watchdog */ + booke_wdt_reset(dev); + val = mfspr(SPRN_TCR); + val &= ~WDTP_MASK; + val |= (TCR_WIE | TCR_WRC(WRC_CHIP) | TCR_WP(sec_to_period(timeout))); + + mtspr(SPRN_TCR, val); + + return 0; +} + +static int booke_wdt_stop(struct udevice *dev) +{ + u32 val; + + val = mfspr(SPRN_TCR); + val &= ~(TCR_WIE | WDTP_MASK); + mtspr(SPRN_TCR, val); + + /* clear status to make sure nothing is pending */ + booke_wdt_reset(dev); + + return 0; +} + +static const struct wdt_ops booke_wdt_ops = { + .start = booke_wdt_start, + .stop = booke_wdt_stop, + .reset = booke_wdt_reset, +}; + +static const struct udevice_id booke_wdt_ids[] = { + { .compatible = "fsl,booke-wdt" }, + {} +}; + +U_BOOT_DRIVER(booke_wdt) = { + .name = "booke_wdt", + .id = UCLASS_WDT, + .of_match = booke_wdt_ids, + .ops = &booke_wdt_ops, +}; diff --git a/drivers/watchdog/designware_wdt.c b/drivers/watchdog/designware_wdt.c index c020324973e..9e5487168cd 100644 --- a/drivers/watchdog/designware_wdt.c +++ b/drivers/watchdog/designware_wdt.c @@ -9,7 +9,6 @@ #include <reset.h> #include <wdt.h> #include <asm/io.h> -#include <asm/utils.h> #include <linux/bitops.h> #define DW_WDT_CR 0x00 @@ -35,7 +34,7 @@ static int designware_wdt_settimeout(void __iomem *base, unsigned int clk_khz, signed int i; /* calculate the timeout range value */ - i = log_2_n_round_up(timeout * clk_khz) - 16; + i = fls(timeout * clk_khz - 1) - 16; i = clamp(i, 0, 15); writel(i | (i << 4), base + DW_WDT_TORR); @@ -130,27 +129,39 @@ static int designware_wdt_probe(struct udevice *dev) if (ret) return ret; + ret = clk_enable(&clk); + if (ret) + goto err; + priv->clk_khz = clk_get_rate(&clk) / 1000; - if (!priv->clk_khz) - return -EINVAL; + if (!priv->clk_khz) { + ret = -EINVAL; + goto err; + } #else priv->clk_khz = CONFIG_DW_WDT_CLOCK_KHZ; #endif -#if CONFIG_IS_ENABLED(DM_RESET) - struct reset_ctl_bulk resets; + if (CONFIG_IS_ENABLED(DM_RESET)) { + struct reset_ctl_bulk resets; - ret = reset_get_bulk(dev, &resets); - if (ret) - return ret; + ret = reset_get_bulk(dev, &resets); + if (ret) + goto err; - ret = reset_deassert_bulk(&resets); - if (ret) - return ret; -#endif + ret = reset_deassert_bulk(&resets); + if (ret) + goto err; + } /* reset to disable the watchdog */ return designware_wdt_stop(dev); + +err: +#if CONFIG_IS_ENABLED(CLK) + clk_free(&clk); +#endif + return ret; } static const struct wdt_ops designware_wdt_ops = { diff --git a/drivers/watchdog/imx_watchdog.c b/drivers/watchdog/imx_watchdog.c index 5e0a096ce50..3586246fbfb 100644 --- a/drivers/watchdog/imx_watchdog.c +++ b/drivers/watchdog/imx_watchdog.c @@ -44,7 +44,7 @@ static void imx_watchdog_expire_now(struct watchdog_regs *wdog, bool ext_reset) #if !defined(CONFIG_IMX_WATCHDOG) || \ (defined(CONFIG_IMX_WATCHDOG) && !CONFIG_IS_ENABLED(WDT)) -void __attribute__((weak)) reset_cpu(ulong addr) +void __attribute__((weak)) reset_cpu(void) { struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR; diff --git a/drivers/watchdog/ulp_wdog.c b/drivers/watchdog/ulp_wdog.c index 7533fc612c7..6f63b11b9ff 100644 --- a/drivers/watchdog/ulp_wdog.c +++ b/drivers/watchdog/ulp_wdog.c @@ -77,7 +77,7 @@ void hw_watchdog_init(void) hw_watchdog_reset(); } -void reset_cpu(ulong addr) +void reset_cpu(void) { struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE_ADDR; diff --git a/drivers/watchdog/wdt-uclass.c b/drivers/watchdog/wdt-uclass.c index 28f7918c467..0603ffbd36d 100644 --- a/drivers/watchdog/wdt-uclass.c +++ b/drivers/watchdog/wdt-uclass.c @@ -27,6 +27,7 @@ static ulong reset_period = 1000; int initr_watchdog(void) { u32 timeout = WATCHDOG_TIMEOUT_SECS; + int ret; /* * Init watchdog: This will call the probe function of the @@ -50,8 +51,17 @@ int initr_watchdog(void) 4 * reset_period) / 4; } - wdt_start(gd->watchdog_dev, timeout * 1000, 0); - gd->flags |= GD_FLG_WDT_READY; + if (!CONFIG_IS_ENABLED(WATCHDOG_AUTOSTART)) { + printf("WDT: Not starting\n"); + return 0; + } + + ret = wdt_start(gd->watchdog_dev, timeout * 1000, 0); + if (ret != 0) { + printf("WDT: Failed to start\n"); + return 0; + } + printf("WDT: Started with%s servicing (%ds timeout)\n", IS_ENABLED(CONFIG_WATCHDOG) ? "" : "out", timeout); @@ -61,21 +71,31 @@ int initr_watchdog(void) int wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags) { const struct wdt_ops *ops = device_get_ops(dev); + int ret; if (!ops->start) return -ENOSYS; - return ops->start(dev, timeout_ms, flags); + ret = ops->start(dev, timeout_ms, flags); + if (ret == 0) + gd->flags |= GD_FLG_WDT_READY; + + return ret; } int wdt_stop(struct udevice *dev) { const struct wdt_ops *ops = device_get_ops(dev); + int ret; if (!ops->stop) return -ENOSYS; - return ops->stop(dev); + ret = ops->stop(dev); + if (ret == 0) + gd->flags &= ~GD_FLG_WDT_READY; + + return ret; } int wdt_reset(struct udevice *dev) |