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[xen-unstable] arm: Shutdown and reboot

 

 

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patchbot at xen

Mar 14, 2012, 5:33 AM

Post #1 of 1 (67 views)
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[xen-unstable] arm: Shutdown and reboot

# HG changeset patch
# User Tim Deegan <tim [at] xen>
# Date 1331651457 0
# Node ID 1e5da26611f36b90c70b3827edc33caa26bd7942
# Parent d21c626d89c65aadbb7f8dac23e8e8f5344bb48e
arm: Shutdown and reboot

Reboot runes grabbed from linux's SP810 reset function.
Doesn't seem to work on the model, though.

Signed-off-by: Tim Deegan <tim [at] xen>
Acked-by: Ian Campbell <ian.campbell [at] citrix>
Committed-by: Ian Campbell <ian.campbell [at] citrix>
---


diff -r d21c626d89c6 -r 1e5da26611f3 xen/arch/arm/shutdown.c
--- a/xen/arch/arm/shutdown.c Tue Mar 13 15:10:56 2012 +0000
+++ b/xen/arch/arm/shutdown.c Tue Mar 13 15:10:57 2012 +0000
@@ -1,18 +1,64 @@
#include <xen/config.h>
+#include <xen/console.h>
+#include <xen/cpu.h>
+#include <xen/delay.h>
#include <xen/lib.h>
+#include <xen/mm.h>
+#include <xen/smp.h>
+
+static void raw_machine_reset(void)
+{
+ /* XXX get this from device tree */
+#ifdef SP810_ADDRESS
+ /* Use the SP810 system controller to force a reset */
+ volatile uint32_t *sp810;
+ set_fixmap(FIXMAP_MISC, SP810_ADDRESS >> PAGE_SHIFT, DEV_SHARED);
+ sp810 = ((uint32_t *)
+ (FIXMAP_ADDR(FIXMAP_MISC) + (SP810_ADDRESS & ~PAGE_MASK)));
+ sp810[0] = 0x3; /* switch to slow mode */
+ dsb(); isb();
+ sp810[1] = 0x1; /* writing any value to SCSYSSTAT reg will reset system */
+ dsb(); isb();
+ clear_fixmap(FIXMAP_MISC);
+#endif
+}
+
+static void halt_this_cpu(void *arg)
+{
+ __cpu_disable();
+ stop_cpu();
+}

void machine_halt(void)
{
- /* TODO: halt */
- while(1) ;
+ watchdog_disable();
+ console_start_sync();
+ local_irq_enable();
+ smp_call_function(halt_this_cpu, NULL, 0);
+ halt_this_cpu(NULL);
}

void machine_restart(unsigned int delay_millisecs)
{
- /* TODO: restart */
- printk("Cannot restart yet\n");
- while(1);
+ int timeout = 10;
+
+ local_irq_enable();
+ smp_call_function(halt_this_cpu, NULL, 0);
+ local_irq_disable();
+
+ mdelay(delay_millisecs);
+
+ /* Wait at most another 10ms for all other CPUs to go offline. */
+ while ( (num_online_cpus() > 1) && (timeout-- > 0) )
+ mdelay(1);
+
+ while ( 1 )
+ {
+ raw_machine_reset();
+ mdelay(100);
+ }
}
+
/*
* Local variables:
* mode: C
diff -r d21c626d89c6 -r 1e5da26611f3 xen/include/asm-arm/config.h
--- a/xen/include/asm-arm/config.h Tue Mar 13 15:10:56 2012 +0000
+++ b/xen/include/asm-arm/config.h Tue Mar 13 15:10:57 2012 +0000
@@ -119,6 +119,9 @@
#define GIC_CR_OFFSET 0x2000
#define GIC_HR_OFFSET 0x4000 /* Guess work http://lists.infradead.org/pipermail/linux-arm-kernel/2011-September/064219.html */
#define GIC_VR_OFFSET 0x6000 /* Virtual Machine CPU interface) */
+/* Board-specific: base address of system controller */
+#define SP810_ADDRESS 0x1C020000
+

#endif /* __ARM_CONFIG_H__ */
/*

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