ARM: 5774/1: Fix Realview ARM1176PB board reboot

This is the fix for proper reboot of Realview ARM1176PB board
when issuing the reboot command. Setting the eighth bit of
control register SYS_RESETCTL to 1 to force a soft reset.
arch_reset() is modified for realview machines to call machine
specific reset function pointers.

Signed-off-by: Philby John <pjohn@in.mvista.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 16 insertions, 0 deletions

diff --git a/arch/arm/mach-realview/realview_pb11mp.c b/arch/arm/mach-realview/realview_pb11mp.c
index 94680fcf726..070d284ce96 100644
--- a/arch/arm/mach-realview/realview_pb11mp.c
+++ b/arch/arm/mach-realview/realview_pb11mp.c
@@ -299,6 +299,21 @@ static struct sys_timer realview_pb11mp_timer = {
         .init           = realview_pb11mp_timer_init,
 };
 
+static void realview_pb11mp_reset(char mode)
+{
+        void __iomem *hdr_ctrl = __io_address(REALVIEW_SYS_BASE) +
+                REALVIEW_SYS_RESETCTL_OFFSET;
+        unsigned int val;
+
+        /*
+         * To reset, we hit the on-board reset register
+         * in the system FPGA
+         */
+        val = __raw_readl(hdr_ctrl);
+        val |= REALVIEW_PB11MP_SYS_CTRL_RESET_CONFIGCLR;
+        __raw_writel(val, hdr_ctrl);
+}
+
 static void __init realview_pb11mp_init(void)
 {
         int i;
@@ -324,6 +339,7 @@ static void __init realview_pb11mp_init(void)
 #ifdef CONFIG_LEDS
         leds_event = realview_leds_event;
 #endif
+        realview_reset = realview_pb11mp_reset;
 }
 
 MACHINE_START(REALVIEW_PB11MP, "ARM-RealView PB11MPCore")