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Commit 323ef8db authored by Magnus Damm's avatar Magnus Damm Committed by Paul Mundt
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sh: Rework SuperH Mobile sleep mode code 

Rework the SuperH Mobile sleep code from including
board specific code to allowing each board to provide
pre/post code snippets. These snippets should contain
sdram management code to enter and leave self-refresh.
Signed-off-by: default avatarMagnus Damm <damm@opensource.se>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent eb0cd9e8
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Showing with 171 additions and 164 deletions
arch/sh/include/asm/suspend.h
View file @ 323ef8db
......@@ -34,6 +34,33 @@ extern struct atomic_notifier_head sh_mobile_post_sleep_notifier_list;
void sh_mobile_register_self_refresh(unsigned long flags,
void *pre_start, void *pre_end,
void *post_start, void *post_end);
/* register structure for address/data information */
struct sh_sleep_regs {
unsigned long stbcr;
};
/* data area for low-level sleep code */
struct sh_sleep_data {
/* current sleep mode (SUSP_SH_...) */
unsigned long mode;
/* addresses of board specific self-refresh snippets */
unsigned long sf_pre;
unsigned long sf_post;
/* register state saved and restored by the assembly code */
unsigned long vbr;
unsigned long spc;
unsigned long sr;
/* structure for keeping register addresses */
struct sh_sleep_regs addr;
/* structure for saving/restoring register state */
struct sh_sleep_regs data;
};
#endif
/* flags passed to assembly suspend code */
......
arch/sh/kernel/asm-offsets.c
View file @ 323ef8db
......@@ -34,5 +34,15 @@ int main(void)
DEFINE(PBE_NEXT, offsetof(struct pbe, next));
DEFINE(SWSUSP_ARCH_REGS_SIZE, sizeof(struct swsusp_arch_regs));
#endif
DEFINE(SH_SLEEP_MODE, offsetof(struct sh_sleep_data, mode));
DEFINE(SH_SLEEP_SF_PRE, offsetof(struct sh_sleep_data, sf_pre));
DEFINE(SH_SLEEP_SF_POST, offsetof(struct sh_sleep_data, sf_post));
DEFINE(SH_SLEEP_VBR, offsetof(struct sh_sleep_data, vbr));
DEFINE(SH_SLEEP_SPC, offsetof(struct sh_sleep_data, spc));
DEFINE(SH_SLEEP_SR, offsetof(struct sh_sleep_data, sr));
DEFINE(SH_SLEEP_BASE_ADDR, offsetof(struct sh_sleep_data, addr));
DEFINE(SH_SLEEP_BASE_DATA, offsetof(struct sh_sleep_data, data));
DEFINE(SH_SLEEP_REG_STBCR, offsetof(struct sh_sleep_regs, stbcr));
return 0;
}
arch/sh/kernel/cpu/shmobile/pm.c
View file @ 323ef8db
......@@ -42,13 +42,14 @@ ATOMIC_NOTIFIER_HEAD(sh_mobile_post_sleep_notifier_list);
#define ILRAM_BASE 0xe5200000
extern const unsigned char sh_mobile_standby[];
extern const unsigned int sh_mobile_standby_size;
void sh_mobile_call_standby(unsigned long mode)
{
void *onchip_mem = (void *)ILRAM_BASE;
void (*standby_onchip_mem)(unsigned long, unsigned long) = onchip_mem;
struct sh_sleep_data *sdp = onchip_mem;
void (*standby_onchip_mem)(unsigned long, unsigned long);
/* code located directly after data structure */
standby_onchip_mem = (void *)(sdp + 1);
atomic_notifier_call_chain(&sh_mobile_pre_sleep_notifier_list,
mode, NULL);
......@@ -60,10 +61,48 @@ void sh_mobile_call_standby(unsigned long mode)
mode, NULL);
}
extern char sh_mobile_sleep_enter_start;
extern char sh_mobile_sleep_enter_end;
extern char sh_mobile_sleep_resume_start;
extern char sh_mobile_sleep_resume_end;
void sh_mobile_register_self_refresh(unsigned long flags,
void *pre_start, void *pre_end,
void *post_start, void *post_end)
{
void *onchip_mem = (void *)ILRAM_BASE;
void *vp;
struct sh_sleep_data *sdp;
int n;
/* part 0: data area */
sdp = onchip_mem;
sdp->addr.stbcr = 0xa4150020; /* STBCR */
vp = sdp + 1;
/* part 1: common code to enter sleep mode */
n = &sh_mobile_sleep_enter_end - &sh_mobile_sleep_enter_start;
memcpy(vp, &sh_mobile_sleep_enter_start, n);
vp += roundup(n, 4);
/* part 2: board specific code to enter self-refresh mode */
n = pre_end - pre_start;
memcpy(vp, pre_start, n);
sdp->sf_pre = (unsigned long)vp;
vp += roundup(n, 4);
/* part 3: board specific code to resume from self-refresh mode */
n = post_end - post_start;
memcpy(vp, post_start, n);
sdp->sf_post = (unsigned long)vp;
vp += roundup(n, 4);
/* part 4: common code to resume from sleep mode */
WARN_ON(vp > (onchip_mem + 0x600));
vp = onchip_mem + 0x600; /* located at interrupt vector */
n = &sh_mobile_sleep_resume_end - &sh_mobile_sleep_resume_start;
memcpy(vp, &sh_mobile_sleep_resume_start, n);
}
static int sh_pm_enter(suspend_state_t state)
......@@ -83,13 +122,6 @@ static struct platform_suspend_ops sh_pm_ops = {
static int __init sh_pm_init(void)
{
void *onchip_mem = (void *)ILRAM_BASE;
/* Copy the assembly snippet to the otherwise ununsed ILRAM */
memcpy(onchip_mem, sh_mobile_standby, sh_mobile_standby_size);
wmb();
ctrl_barrier();
suspend_set_ops(&sh_pm_ops);
sh_mobile_setup_cpuidle();
return 0;
......
arch/sh/kernel/cpu/shmobile/sleep.S
View file @ 323ef8db
......@@ -20,79 +20,49 @@
* Kernel mode register usage, see entry.S:
* k0 scratch
* k1 scratch
* k4 scratch
*/
#define k0 r0
#define k1 r1
#define k4 r4
/* manage self-refresh and enter standby mode.
/* manage self-refresh and enter standby mode. must be self-contained.
* this code will be copied to on-chip memory and executed from there.
*/
.balign 4
ENTRY(sh_mobile_sleep_enter_start)
.balign 4096,0,4096
ENTRY(sh_mobile_standby)
/* save mode flags */
mov.l r4, @(SH_SLEEP_MODE, r5)
/* save original vbr */
stc vbr, r1
mova saved_vbr, r0
mov.l r1, @r0
stc vbr, r0
mov.l r0, @(SH_SLEEP_VBR, r5)
/* point vbr to our on-chip memory page */
ldc r5, vbr
/* save return address */
mova saved_spc, r0
sts pr, r5
mov.l r5, @r0
sts pr, r0
mov.l r0, @(SH_SLEEP_SPC, r5)
/* save sr */
mova saved_sr, r0
stc sr, r5
mov.l r5, @r0
stc sr, r0
mov.l r0, @(SH_SLEEP_SR, r5)
/* save mode flags */
mova saved_mode, r0
mov.l r4, @r0
/* put mode flags in r0 */
mov r4, r0
/* save stbcr */
bsr save_register
mov #SH_SLEEP_REG_STBCR, r0
/* call self-refresh entering code if needed */
mov.l @(SH_SLEEP_MODE, r5), r0
tst #SUSP_SH_SF, r0
bt skip_set_sf
#ifdef CONFIG_CPU_SUBTYPE_SH7724
/* DBSC: put memory in self-refresh mode */
mov.l dben_reg, r4
mov.l dben_data0, r1
mov.l r1, @r4
mov.l dbrfpdn0_reg, r4
mov.l dbrfpdn0_data0, r1
mov.l r1, @r4
mov.l dbcmdcnt_reg, r4
mov.l dbcmdcnt_data0, r1
mov.l r1, @r4
mov.l dbcmdcnt_reg, r4
mov.l dbcmdcnt_data1, r1
mov.l r1, @r4
mov.l dbrfpdn0_reg, r4
mov.l dbrfpdn0_data1, r1
mov.l r1, @r4
#else
/* SBSC: disable power down and put in self-refresh mode */
mov.l 1f, r4
mov.l 2f, r1
mov.l @r4, r2
or r1, r2
mov.l 3f, r3
and r3, r2
mov.l r2, @r4
#endif
mov.l @(SH_SLEEP_SF_PRE, r5), r0
jsr @r0
nop
skip_set_sf:
mov.l @(SH_SLEEP_MODE, r5), r0
tst #SUSP_SH_STANDBY, r0
bt test_rstandby
......@@ -123,124 +93,92 @@ force_sleep:
do_sleep:
/* setup and enter selected standby mode */
mov.l 5f, r4
mov.l r1, @r4
bsr get_register
mov #SH_SLEEP_REG_STBCR, r0
mov.l r1, @r0
again:
sleep
bra again
nop
restore_jump_vbr:
save_register:
add #SH_SLEEP_BASE_ADDR, r0
mov.l @(r0, r5), r1
add #-SH_SLEEP_BASE_ADDR, r0
mov.l @r1, r1
add #SH_SLEEP_BASE_DATA, r0
mov.l r1, @(r0, r5)
add #-SH_SLEEP_BASE_DATA, r0
rts
nop
get_register:
add #SH_SLEEP_BASE_ADDR, r0
mov.l @(r0, r5), r0
rts
nop
ENTRY(sh_mobile_sleep_enter_end)
.balign 4
ENTRY(sh_mobile_sleep_resume_start)
/* figure out start address */
bsr 0f
nop
0:
sts pr, k1
mov.l 1f, k0
and k0, k1
/* store pointer to data area in VBR */
ldc k1, vbr
/* setup sr with saved sr */
mov.l @(SH_SLEEP_SR, k1), k0
ldc k0, sr
/* now: user register set! */
stc vbr, r5
/* setup spc with return address to c code */
mov.l saved_spc, k0
ldc k0, spc
mov.l @(SH_SLEEP_SPC, r5), r0
ldc r0, spc
/* restore vbr */
mov.l saved_vbr, k0
ldc k0, vbr
mov.l @(SH_SLEEP_VBR, r5), r0
ldc r0, vbr
/* setup ssr with saved sr */
mov.l saved_sr, k0
ldc k0, ssr
/* get mode flags */
mov.l saved_mode, k0
mov.l @(SH_SLEEP_SR, r5), r0
ldc r0, ssr
done_sleep:
/* reset standby mode to sleep mode */
mov.l 5f, k4
mov #0x00, k1
mov.l k1, @k4
/* restore sleep mode register */
bsr restore_register
mov #SH_SLEEP_REG_STBCR, r0
tst #SUSP_SH_SF, k0
/* call self-refresh resume code if needed */
mov.l @(SH_SLEEP_MODE, r5), r0
tst #SUSP_SH_SF, r0
bt skip_restore_sf
#ifdef CONFIG_CPU_SUBTYPE_SH7724
/* DBSC: put memory in auto-refresh mode */
mov.l dbrfpdn0_reg, k4
mov.l dbrfpdn0_data0, k1
mov.l k1, @k4
nop /* sleep 140 ns */
nop
nop
mov.l @(SH_SLEEP_SF_POST, r5), r0
jsr @r0
nop
mov.l dbcmdcnt_reg, k4
mov.l dbcmdcnt_data0, k1
mov.l k1, @k4
mov.l dbcmdcnt_reg, k4
mov.l dbcmdcnt_data1, k1
mov.l k1, @k4
mov.l dben_reg, k4
mov.l dben_data1, k1
mov.l k1, @k4
mov.l dbrfpdn0_reg, k4
mov.l dbrfpdn0_data2, k1
mov.l k1, @k4
#else
/* SBSC: set auto-refresh mode */
mov.l 1f, k4
mov.l @k4, k0
mov.l 4f, k1
and k1, k0
mov.l k0, @k4
mov.l 6f, k4
mov.l 8f, k0
mov.l @k4, k1
mov #-1, k4
add k4, k1
or k1, k0
mov.l 7f, k1
mov.l k0, @k1
#endif
skip_restore_sf:
/* jump to vbr vector */
mov.l saved_vbr, k0
mov.l offset_vbr, k4
add k4, k0
jmp @k0
rte
nop
.balign 4
saved_mode: .long 0
saved_spc: .long 0
saved_sr: .long 0
saved_vbr: .long 0
offset_vbr: .long 0x600
#ifdef CONFIG_CPU_SUBTYPE_SH7724
dben_reg: .long 0xfd000010 /* DBEN */
dben_data0: .long 0
dben_data1: .long 1
dbrfpdn0_reg: .long 0xfd000040 /* DBRFPDN0 */
dbrfpdn0_data0: .long 0
dbrfpdn0_data1: .long 1
dbrfpdn0_data2: .long 0x00010000
dbcmdcnt_reg: .long 0xfd000014 /* DBCMDCNT */
dbcmdcnt_data0: .long 2
dbcmdcnt_data1: .long 4
#else
1: .long 0xfe400008 /* SDCR0 */
2: .long 0x00000400
3: .long 0xffff7fff
4: .long 0xfffffbff
#endif
5: .long 0xa4150020 /* STBCR */
6: .long 0xfe40001c /* RTCOR */
7: .long 0xfe400018 /* RTCNT */
8: .long 0xa55a0000
/* interrupt vector @ 0x600 */
.balign 0x400,0,0x400
.long 0xdeadbeef
.balign 0x200,0,0x200
bra restore_jump_vbr
restore_register:
add #SH_SLEEP_BASE_DATA, r0
mov.l @(r0, r5), r1
add #-SH_SLEEP_BASE_DATA, r0
add #SH_SLEEP_BASE_ADDR, r0
mov.l @(r0, r5), r0
mov.l r1, @r0
rts
nop
sh_mobile_standby_end:
ENTRY(sh_mobile_standby_size)
.long sh_mobile_standby_end - sh_mobile_standby
.balign 4
1: .long ~0x7ff
ENTRY(sh_mobile_sleep_resume_end)
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