a1383655cf
Tested on bcm2710 (Raspberry Pi 3B). Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
103 lines
3.4 KiB
Diff
103 lines
3.4 KiB
Diff
From 46c30599f994d0d1db25b9f71bd6b24ae80c1a7c Mon Sep 17 00:00:00 2001
|
|
From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
|
|
Date: Fri, 7 Oct 2016 16:50:59 +0200
|
|
Subject: [PATCH] watchdog: bcm2835: Support setting reboot partition
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
The Raspberry Pi firmware looks at the RSTS register to know which
|
|
partition to boot from. The reboot syscall command
|
|
LINUX_REBOOT_CMD_RESTART2 supports passing in a string argument.
|
|
|
|
Add support for passing in a partition number 0..63 to boot from.
|
|
Partition 63 is a special partiton indicating halt.
|
|
If the partition doesn't exist, the firmware falls back to partition 0.
|
|
|
|
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
|
|
---
|
|
drivers/watchdog/bcm2835_wdt.c | 49 +++++++++++++++++++---------------
|
|
1 file changed, 27 insertions(+), 22 deletions(-)
|
|
|
|
--- a/drivers/watchdog/bcm2835_wdt.c
|
|
+++ b/drivers/watchdog/bcm2835_wdt.c
|
|
@@ -32,13 +32,7 @@
|
|
#define PM_RSTC_WRCFG_SET 0x00000030
|
|
#define PM_RSTC_WRCFG_FULL_RESET 0x00000020
|
|
#define PM_RSTC_RESET 0x00000102
|
|
-
|
|
-/*
|
|
- * The Raspberry Pi firmware uses the RSTS register to know which partition
|
|
- * to boot from. The partition value is spread into bits 0, 2, 4, 6, 8, 10.
|
|
- * Partition 63 is a special partition used by the firmware to indicate halt.
|
|
- */
|
|
-#define PM_RSTS_RASPBERRYPI_HALT 0x555
|
|
+#define PM_RSTS_PARTITION_CLR 0xfffffaaa
|
|
|
|
#define SECS_TO_WDOG_TICKS(x) ((x) << 16)
|
|
#define WDOG_TICKS_TO_SECS(x) ((x) >> 16)
|
|
@@ -97,9 +91,24 @@ static unsigned int bcm2835_wdt_get_time
|
|
return WDOG_TICKS_TO_SECS(ret & PM_WDOG_TIME_SET);
|
|
}
|
|
|
|
-static void __bcm2835_restart(struct bcm2835_wdt *wdt)
|
|
+/*
|
|
+ * 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.
|
|
+ */
|
|
+
|
|
+static void __bcm2835_restart(struct bcm2835_wdt *wdt, u8 partition)
|
|
{
|
|
- u32 val;
|
|
+ u32 val, rsts;
|
|
+
|
|
+ rsts = (partition & BIT(0)) | ((partition & BIT(1)) << 1) |
|
|
+ ((partition & BIT(2)) << 2) | ((partition & BIT(3)) << 3) |
|
|
+ ((partition & BIT(4)) << 4) | ((partition & BIT(5)) << 5);
|
|
+
|
|
+ val = readl_relaxed(wdt->base + PM_RSTS);
|
|
+ val &= PM_RSTS_PARTITION_CLR;
|
|
+ val |= PM_PASSWORD | rsts;
|
|
+ writel_relaxed(val, wdt->base + PM_RSTS);
|
|
|
|
/* use a timeout of 10 ticks (~150us) */
|
|
writel_relaxed(10 | PM_PASSWORD, wdt->base + PM_WDOG);
|
|
@@ -117,7 +126,13 @@ static int bcm2835_restart(struct watchd
|
|
{
|
|
struct bcm2835_wdt *wdt = watchdog_get_drvdata(wdog);
|
|
|
|
- __bcm2835_restart(wdt);
|
|
+ unsigned long long val;
|
|
+ u8 partition = 0;
|
|
+
|
|
+ if (data && !kstrtoull(data, 0, &val) && val <= 63)
|
|
+ partition = val;
|
|
+
|
|
+ __bcm2835_restart(wdt, partition);
|
|
|
|
return 0;
|
|
}
|
|
@@ -152,19 +167,9 @@ static struct watchdog_device bcm2835_wd
|
|
static void bcm2835_power_off(void)
|
|
{
|
|
struct bcm2835_wdt *wdt = bcm2835_power_off_wdt;
|
|
- u32 val;
|
|
-
|
|
- /*
|
|
- * We set the watchdog hard reset bit here to distinguish this reset
|
|
- * from the normal (full) reset. bootcode.bin will not reboot after a
|
|
- * hard reset.
|
|
- */
|
|
- val = readl_relaxed(wdt->base + PM_RSTS);
|
|
- val |= PM_PASSWORD | PM_RSTS_RASPBERRYPI_HALT;
|
|
- writel_relaxed(val, wdt->base + PM_RSTS);
|
|
|
|
- /* Continue with normal reset mechanism */
|
|
- __bcm2835_restart(wdt);
|
|
+ /* Partition 63 tells the firmware that this is a halt */
|
|
+ __bcm2835_restart(wdt, 63);
|
|
}
|
|
|
|
static int bcm2835_wdt_probe(struct platform_device *pdev)
|