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authorNoralf Trønnes <noralf@tronnes.org>2015-06-17 17:04:04 +0300
committerWim Van Sebroeck <wim@iguana.be>2015-09-28 11:56:05 +0300
commit898e6861ff7cfc9f539b57859a27fbd1fe4298ae (patch)
tree449a20ba7c6ee5e1097026aa83725752230cbfa8 /drivers/watchdog
parentc73318f43d3967e3ce810665d9c74a7d238d24d1 (diff)
downloadlinux-898e6861ff7cfc9f539b57859a27fbd1fe4298ae.tar.xz
watchdog: bcm2835: Fix poweroff behaviour
Currently poweroff/halt results in a reboot on the Raspberry Pi. The firmware uses the RSTS register to know which partiton to boot from. The partiton value is spread into bits 0, 2, 4, 6, 8, 10. Partiton 63 is a special partition used by the firmware to indicate halt. The firmware made this change in 19 Aug 2013 and was matched by the downstream commit: Changes for new NOOBS multi partition booting from gsh Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Tested-by: Stephen Warren <swarren@wwwdotorg.org> Acked-by: Stephen Warren <swarren@wwwdotorg.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/bcm2835_wdt.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/watchdog/bcm2835_wdt.c b/drivers/watchdog/bcm2835_wdt.c
index 66c3e656a616..8a5ce5b5a0b6 100644
--- a/drivers/watchdog/bcm2835_wdt.c
+++ b/drivers/watchdog/bcm2835_wdt.c
@@ -36,6 +36,13 @@
#define PM_RSTC_WRCFG_FULL_RESET 0x00000020
#define PM_RSTC_RESET 0x00000102
+/*
+ * The Raspberry Pi firmware uses the RSTS register to know which partiton
+ * to boot from. The partiton value is spread into bits 0, 2, 4, 6, 8, 10.
+ * Partiton 63 is a special partition used by the firmware to indicate halt.
+ */
+#define PM_RSTS_RASPBERRYPI_HALT 0x555
+
#define SECS_TO_WDOG_TICKS(x) ((x) << 16)
#define WDOG_TICKS_TO_SECS(x) ((x) >> 16)
@@ -151,8 +158,7 @@ static void bcm2835_power_off(void)
* hard reset.
*/
val = readl_relaxed(wdt->base + PM_RSTS);
- val &= PM_RSTC_WRCFG_CLR;
- val |= PM_PASSWORD | PM_RSTS_HADWRH_SET;
+ val |= PM_PASSWORD | PM_RSTS_RASPBERRYPI_HALT;
writel_relaxed(val, wdt->base + PM_RSTS);
/* Continue with normal reset mechanism */