restart: replace reset_cpu with registered restart handlers

This replaces the reset_cpu() function which every SoC or board must
provide with registered handlers. This makes it possible to have multiple
reset functions for boards which have multiple ways to reset the machine.
Also boards which have no way at all to reset the machine no longer
have to provide a dummy reset_cpu() function.

The problem this solves is that some machines have external PMICs or
similar to reset the system which have to be preferred over the
internal SoC reset, because the PMIC can reset not only the SoC but also
the external devices.

To pick the right way to reset a machine each handler has a priority. The
default priority is 100 and all currently existing restart handlers are
registered with this priority. of_get_restart_priority() allows to retrieve
the priority from the device tree which makes it possible for boards to
give certain restart handlers a higher priority in order to use this one
instead of the default one.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 12 insertions, 7 deletions

diff --git a/arch/arm/mach-ep93xx/clocksource.c b/arch/arm/mach-ep93xx/clocksource.c
index f396d0a0a2..83c05cea00 100644
--- a/arch/arm/mach-ep93xx/clocksource.c
+++ b/arch/arm/mach-ep93xx/clocksource.c
@@ -20,6 +20,7 @@
 #include <init.h>
 #include <clock.h>
 #include <io.h>
+#include <restart.h>
 #include <mach/ep93xx-regs.h>
 
 #define TIMER_CLKSEL		(1 << 3)
@@ -63,10 +64,8 @@ static int clocksource_init(void)
 
 core_initcall(clocksource_init);
 
-/*
- * Reset the cpu
- */
-void __noreturn reset_cpu(unsigned long addr)
+/* Reset the SoC */
+static void __noreturn ep92xx_restart_soc(struct restart_handler *rst)
 {
 	struct syscon_regs *syscon = (struct syscon_regs *)SYSCON_BASE;
 	uint32_t value;
@@ -84,7 +83,13 @@ void __noreturn reset_cpu(unsigned long addr)
 	writel(value, &syscon->devicecfg);
 
 	/* Dying... */
-	while (1)
-		; /* noop */
+	hang();
+}
+
+static int restart_register_feature(void)
+{
+	restart_handler_register_fn(ep92xx_restart_soc);
+
+	return 0;
 }
-EXPORT_SYMBOL(reset_cpu);
+coredevice_initcall(restart_register_feature);