diff options
| author | Christophe Leroy | 2018-11-21 08:51:45 +0000 |
|---|---|---|
| committer | Tom Rini | 2018-12-03 10:44:10 -0500 |
| commit | 749c9aae9d59c5f15832b51a75f8959c25316ab1 (patch) | |
| tree | c015c00af11ab535a83030393c13ecc6ba901710 | |
| parent | f55db0afa23de5beedb63c011a879ebbe0f61613 (diff) | |
drivers: watchdog: add a DM driver for the MPC8xx watchdog
This patch adds a DM driver for the MPC8xx watchdog.
Basically, the watchdog is enabled by default from the start and
SYPCR register has to be writen once to set the timeout and/or
deactivate the watchdog. Once written, it cannot be written again.
It means that wdt_stop() can be called before wdt_start() to stop the
watchdog, but cannot be called if wdt_start() has been called.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
| -rw-r--r-- | drivers/watchdog/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/watchdog/mpc8xx_wdt.c | 51 |
2 files changed, 58 insertions, 0 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 4a9ebb6e268..b6974ad619a 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -144,4 +144,11 @@ config WDT_MT7621 Select this to enable Ralink / Mediatek watchdog timer, which can be found on some MediaTek chips. +config WDT_MPC8xx + bool "MPC8xx watchdog timer support" + depends on WDT && MPC8xx + select CONFIG_MPC8xx_WATCHDOG + help + Select this to enable mpc8xx watchdog timer + endmenu diff --git a/drivers/watchdog/mpc8xx_wdt.c b/drivers/watchdog/mpc8xx_wdt.c index ccb06ac425f..c24c2a9da6d 100644 --- a/drivers/watchdog/mpc8xx_wdt.c +++ b/drivers/watchdog/mpc8xx_wdt.c @@ -4,6 +4,8 @@ */ #include <common.h> +#include <dm.h> +#include <wdt.h> #include <mpc8xx.h> #include <asm/cpm_8xx.h> #include <asm/io.h> @@ -16,3 +18,52 @@ void hw_watchdog_reset(void) out_be16(&immap->im_siu_conf.sc_swsr, 0xaa39); /* write magic2 */ } +#ifdef CONFIG_WDT_MPC8xx +static int mpc8xx_wdt_start(struct udevice *dev, u64 timeout, ulong flags) +{ + immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR; + + out_be32(&immap->im_siu_conf.sc_sypcr, CONFIG_SYS_SYPCR); + + if (!(in_be32(&immap->im_siu_conf.sc_sypcr) & SYPCR_SWE)) + return -EBUSY; + return 0; + +} + +static int mpc8xx_wdt_stop(struct udevice *dev) +{ + immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR; + + out_be32(&immap->im_siu_conf.sc_sypcr, CONFIG_SYS_SYPCR & ~SYPCR_SWE); + + if (in_be32(&immap->im_siu_conf.sc_sypcr) & SYPCR_SWE) + return -EBUSY; + return 0; +} + +static int mpc8xx_wdt_reset(struct udevice *dev) +{ + hw_watchdog_reset(); + + return 0; +} + +static const struct wdt_ops mpc8xx_wdt_ops = { + .start = mpc8xx_wdt_start, + .reset = mpc8xx_wdt_reset, + .stop = mpc8xx_wdt_stop, +}; + +static const struct udevice_id mpc8xx_wdt_ids[] = { + { .compatible = "fsl,pq1-wdt" }, + {} +}; + +U_BOOT_DRIVER(wdt_mpc8xx) = { + .name = "wdt_mpc8xx", + .id = UCLASS_WDT, + .of_match = mpc8xx_wdt_ids, + .ops = &mpc8xx_wdt_ops, +}; +#endif /* CONFIG_WDT_MPC8xx */ |