ARM: OMAP2+: Fix reboot for 81xx

We are missing proper hooks for 81xx for reboot to work.

Cc: Brian Hutchinson <b.hutchman@gmail.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

3 files changed, 43 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 5d27dfdef66b..3a6463f88ea2 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -58,6 +58,7 @@ AFLAGS_sram34xx.o			:=-Wa,-march=armv7-a
 # Restart code (OMAP4/5 currently in omap4-common.c)
 obj-$(CONFIG_SOC_OMAP2420)              += omap2-restart.o
 obj-$(CONFIG_SOC_OMAP2430)              += omap2-restart.o
+obj-$(CONFIG_SOC_TI81XX)                += ti81xx-restart.o
 obj-$(CONFIG_SOC_AM33XX)                += am33xx-restart.o
 obj-$(CONFIG_SOC_AM43XX)                += omap4-restart.o
 obj-$(CONFIG_ARCH_OMAP3)                += omap3-restart.o
diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
index 900ebdd544a0..65b4371b3361 100644
--- a/arch/arm/mach-omap2/common.h
+++ b/arch/arm/mach-omap2/common.h
@@ -164,6 +164,14 @@ static inline void omap3xxx_restart(enum reboot_mode mode, const char *cmd)
 }
 #endif
 
+#ifdef CONFIG_SOC_TI81XX
+void ti81xx_restart(enum reboot_mode mode, const char *cmd);
+#else
+static inline void ti81xx_restart(enum reboot_mode mode, const char *cmd)
+{
+}
+#endif
+
 #if defined(CONFIG_ARCH_OMAP4) || defined(CONFIG_SOC_OMAP5) || \
         defined(CONFIG_SOC_DRA7XX) || defined(CONFIG_SOC_AM43XX)
 void omap44xx_restart(enum reboot_mode mode, const char *cmd);
diff --git a/arch/arm/mach-omap2/ti81xx-restart.c b/arch/arm/mach-omap2/ti81xx-restart.c
new file mode 100644
index 000000000000..6c3ce7c46ddd
--- /dev/null
+++ b/arch/arm/mach-omap2/ti81xx-restart.c
@@ -0,0 +1,34 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/reboot.h>
+
+#include "iomap.h"
+#include "common.h"
+#include "control.h"
+#include "prm3xxx.h"
+
+#define TI81XX_PRM_DEVICE_RSTCTRL       0x00a0
+#define TI81XX_GLOBAL_RST_COLD          BIT(1)
+
+/**
+ * ti81xx_restart - trigger a software restart of the SoC
+ * @mode: the "reboot mode", see arch/arm/kernel/{setup,process}.c
+ * @cmd: passed from the userspace program rebooting the system (if provided)
+ *
+ * Resets the SoC.  For @cmd, see the 'reboot' syscall in
+ * kernel/sys.c.  No return value.
+ *
+ * NOTE: Warm reset does not seem to work, may require resetting
+ * clocks to bypass mode.
+ */
+void ti81xx_restart(enum reboot_mode mode, const char *cmd)
+{
+        omap2_prm_set_mod_reg_bits(TI81XX_GLOBAL_RST_COLD, 0,
+                                   TI81XX_PRM_DEVICE_RSTCTRL);
+        while (1);
+}