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sh: rework SuperH Mobile sleep code exception handling

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This patch updates the exception handling in the sleep code
for SuperH Mobile. With the patch applied the sleep code
always rewrites the VBR and resumes from the exception vector,
re-initializes hardware and jumps straight to the original
interrupt vector.

Tested on sh7722 and sh7724 with "Sleep Mode", "Sleep Mode + SF"
and "Software Standby Mode + SF" with CONFIG_SUSPEND.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm
2009-08-17 09:27:29 +00:00
committed by Paul Mundt
parent cd7246f0e2
commit 309214af53
2 changed files with 107 additions and 64 deletions
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16
arch/sh/kernel/cpu/shmobile/pm.c
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@@ -41,23 +41,11 @@ extern const unsigned int sh_mobile_standby_size;
void sh_mobile_call_standby(unsigned long mode)
{
extern void *vbr_base;
void *onchip_mem = (void *)ILRAM_BASE;
void (*standby_onchip_mem)(unsigned long) = onchip_mem;
/* Note: Wake up from sleep may generate exceptions!
* Setup VBR to point to on-chip ram if self-refresh is
* going to be used.
*/
if (mode & SUSP_SH_SF)
asm volatile("ldc %0, vbr" : : "r" (onchip_mem) : "memory");
void (*standby_onchip_mem)(unsigned long, unsigned long) = onchip_mem;
/* Let assembly snippet in on-chip memory handle the rest */
standby_onchip_mem(mode);
/* Put VBR back in System RAM again */
if (mode & SUSP_SH_SF)
asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
standby_onchip_mem(mode, ILRAM_BASE);
}
static int sh_pm_enter(suspend_state_t state)