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-rw-r--r--target/linux/brcm2708/patches-4.9/0023-watchdog-bcm2835-Support-setting-reboot-partition.patch124
1 files changed, 124 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.9/0023-watchdog-bcm2835-Support-setting-reboot-partition.patch b/target/linux/brcm2708/patches-4.9/0023-watchdog-bcm2835-Support-setting-reboot-partition.patch
new file mode 100644
index 0000000000..160c5767f0
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.9/0023-watchdog-bcm2835-Support-setting-reboot-partition.patch
@@ -0,0 +1,124 @@
+From 259f169ef05f12bc7fed007befc11ed6c66dd9c8 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 | 61 +++++++++++++++++++++++++-----------------
+ 1 file changed, 36 insertions(+), 25 deletions(-)
+
+--- a/drivers/watchdog/bcm2835_wdt.c
++++ b/drivers/watchdog/bcm2835_wdt.c
+@@ -35,13 +35,7 @@
+ #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 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 PM_RSTS_PARTITION_CLR 0xfffffaaa
+
+ #define SECS_TO_WDOG_TICKS(x) ((x) << 16)
+ #define WDOG_TICKS_TO_SECS(x) ((x) >> 16)
+@@ -111,15 +105,28 @@ static struct watchdog_device bcm2835_wd
+ .timeout = WDOG_TICKS_TO_SECS(PM_WDOG_TIME_SET),
+ };
+
+-static int
+-bcm2835_restart(struct notifier_block *this, unsigned long mode, void *cmd)
++/*
++ * 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)
+ {
+- struct bcm2835_wdt *wdt = container_of(this, struct bcm2835_wdt,
+- restart_handler);
+- 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);
++
+ val = readl_relaxed(wdt->base + PM_RSTC);
+ val &= PM_RSTC_WRCFG_CLR;
+ val |= PM_PASSWORD | PM_RSTC_WRCFG_FULL_RESET;
+@@ -127,6 +134,20 @@ bcm2835_restart(struct notifier_block *t
+
+ /* No sleeping, possibly atomic. */
+ mdelay(1);
++}
++
++static int bcm2835_restart_notifier_call(struct notifier_block *this,
++ unsigned long mode, void *cmd)
++{
++ struct bcm2835_wdt *wdt = container_of(this, struct bcm2835_wdt,
++ restart_handler);
++ unsigned long long val;
++ u8 partition = 0;
++
++ if (cmd && !kstrtoull(cmd, 0, &val) && val <= 63)
++ partition = val;
++
++ bcm2835_restart(wdt, partition);
+
+ return 0;
+ }
+@@ -142,19 +163,9 @@ static void bcm2835_power_off(void)
+ of_find_compatible_node(NULL, NULL, "brcm,bcm2835-pm-wdt");
+ struct platform_device *pdev = of_find_device_by_node(np);
+ struct bcm2835_wdt *wdt = platform_get_drvdata(pdev);
+- 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->restart_handler, REBOOT_HARD, NULL);
++ /* Partition 63 tells the firmware that this is a halt */
++ bcm2835_restart(wdt, 63);
+ }
+
+ static int bcm2835_wdt_probe(struct platform_device *pdev)
+@@ -188,7 +199,7 @@ static int bcm2835_wdt_probe(struct plat
+ return err;
+ }
+
+- wdt->restart_handler.notifier_call = bcm2835_restart;
++ wdt->restart_handler.notifier_call = bcm2835_restart_notifier_call;
+ wdt->restart_handler.priority = 128;
+ register_restart_handler(&wdt->restart_handler);
+ if (pm_power_off == NULL)