From patchwork Wed Feb 19 16:50:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe Leroy X-Patchwork-Id: 236591 List-Id: U-Boot discussion From: christophe.leroy at c-s.fr (Christophe Leroy) Date: Wed, 19 Feb 2020 16:50:15 +0000 (UTC) Subject: [PATCH] watchdog: mpc8xx_wdt: Allow selection of watchdog mode through environment Message-ID: From: Charles Frey The mpc8xx watchdog can work either in 'reset mode' or 'NMI mode'. The selection can be done at startup only. It is desirable to select the mode without rebuilding U-boot. It is also desirable to disable the watchdog without rebuilding. At watchdog startup, check environment variable 'watchdog_mode'. If it is 'off', the watchdog is not started. If it is 'nmi', the watchdog is started in NMI mode. Otherwise, it is started in reset mode which is the default mode. Signed-off-by: Charles Frey Signed-off-by: Christophe Leroy --- drivers/watchdog/mpc8xx_wdt.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/watchdog/mpc8xx_wdt.c b/drivers/watchdog/mpc8xx_wdt.c index 675b62d8b3..8a7a4c5bc6 100644 --- a/drivers/watchdog/mpc8xx_wdt.c +++ b/drivers/watchdog/mpc8xx_wdt.c @@ -4,6 +4,7 @@ */ #include +#include #include #include #include @@ -21,8 +22,15 @@ static void hw_watchdog_reset(void) static int mpc8xx_wdt_start(struct udevice *dev, u64 timeout, ulong flags) { immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR; + u32 val = CONFIG_SYS_SYPCR; + const char *mode = env_get("watchdog_mode"); - out_be32(&immap->im_siu_conf.sc_sypcr, CONFIG_SYS_SYPCR); + if (strcmp(mode, "off") == 0) + val = val & ~(SYPCR_SWE | SYPCR_SWRI); + else if (strcmp(mode, "nmi") == 0) + val = (val & ~SYPCR_SWRI) | SYPCR_SWE; + + out_be32(&immap->im_siu_conf.sc_sypcr, val); if (!(in_be32(&immap->im_siu_conf.sc_sypcr) & SYPCR_SWE)) return -EBUSY;