aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--arch/sh/Kconfig1
-rw-r--r--arch/sh/include/asm/suspend.h9
-rw-r--r--arch/sh/kernel/cpu/sh4a/Makefile4
-rw-r--r--arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c92
-rw-r--r--arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S125
5 files changed, 231 insertions, 0 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index adffbf4048b1..a0c879d17fd6 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -181,6 +181,7 @@ config CPU_SHX3
181 181
182config ARCH_SHMOBILE 182config ARCH_SHMOBILE
183 bool 183 bool
184 select ARCH_SUSPEND_POSSIBLE
184 185
185choice 186choice
186 prompt "Processor sub-type selection" 187 prompt "Processor sub-type selection"
diff --git a/arch/sh/include/asm/suspend.h b/arch/sh/include/asm/suspend.h
index 5d6d8aba5682..b1b995370e79 100644
--- a/arch/sh/include/asm/suspend.h
+++ b/arch/sh/include/asm/suspend.h
@@ -1,6 +1,7 @@
1#ifndef _ASM_SH_SUSPEND_H 1#ifndef _ASM_SH_SUSPEND_H
2#define _ASM_SH_SUSPEND_H 2#define _ASM_SH_SUSPEND_H
3 3
4#ifndef __ASSEMBLY__
4static inline int arch_prepare_suspend(void) { return 0; } 5static inline int arch_prepare_suspend(void) { return 0; }
5 6
6#include <asm/ptrace.h> 7#include <asm/ptrace.h>
@@ -9,5 +10,13 @@ struct swsusp_arch_regs {
9 struct pt_regs user_regs; 10 struct pt_regs user_regs;
10 unsigned long bank1_regs[8]; 11 unsigned long bank1_regs[8];
11}; 12};
13#endif
14
15/* flags passed to assembly suspend code */
16#define SUSP_SH_SLEEP (1 << 0) /* Regular sleep mode */
17#define SUSP_SH_STANDBY (1 << 1) /* SH-Mobile Software standby mode */
18#define SUSP_SH_RSTANDBY (1 << 2) /* SH-Mobile R-standby mode */
19#define SUSP_SH_USTANDBY (1 << 3) /* SH-Mobile U-standby mode */
20#define SUSP_SH_SF (1 << 4) /* Enable self-refresh */
12 21
13#endif /* _ASM_SH_SUSPEND_H */ 22#endif /* _ASM_SH_SUSPEND_H */
diff --git a/arch/sh/kernel/cpu/sh4a/Makefile b/arch/sh/kernel/cpu/sh4a/Makefile
index 1a92361feeb9..09967dc0065a 100644
--- a/arch/sh/kernel/cpu/sh4a/Makefile
+++ b/arch/sh/kernel/cpu/sh4a/Makefile
@@ -35,6 +35,10 @@ pinmux-$(CONFIG_CPU_SUBTYPE_SH7723) := pinmux-sh7723.o
35pinmux-$(CONFIG_CPU_SUBTYPE_SH7785) := pinmux-sh7785.o 35pinmux-$(CONFIG_CPU_SUBTYPE_SH7785) := pinmux-sh7785.o
36pinmux-$(CONFIG_CPU_SUBTYPE_SH7786) := pinmux-sh7786.o 36pinmux-$(CONFIG_CPU_SUBTYPE_SH7786) := pinmux-sh7786.o
37 37
38# Power Mangement & Sleep mode
39pm-$(CONFIG_ARCH_SHMOBILE) := pm-sh_mobile.o sleep-sh_mobile.o
40
38obj-y += $(clock-y) 41obj-y += $(clock-y)
39obj-$(CONFIG_SMP) += $(smp-y) 42obj-$(CONFIG_SMP) += $(smp-y)
40obj-$(CONFIG_GENERIC_GPIO) += $(pinmux-y) 43obj-$(CONFIG_GENERIC_GPIO) += $(pinmux-y)
44obj-$(CONFIG_PM) += $(pm-y)
diff --git a/arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c b/arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c
new file mode 100644
index 000000000000..8c067adf6830
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c
@@ -0,0 +1,92 @@
1/*
2 * arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c
3 *
4 * Power management support code for SuperH Mobile
5 *
6 * Copyright (C) 2009 Magnus Damm
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
10 * for more details.
11 */
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/io.h>
15#include <linux/suspend.h>
16#include <asm/suspend.h>
17#include <asm/uaccess.h>
18
19/*
20 * Sleep modes available on SuperH Mobile:
21 *
22 * Sleep mode is just plain "sleep" instruction
23 * Sleep Self-Refresh mode is above plus RAM put in Self-Refresh
24 * Standby Self-Refresh mode is above plus stopped clocks
25 */
26#define SUSP_MODE_SLEEP (SUSP_SH_SLEEP)
27#define SUSP_MODE_SLEEP_SF (SUSP_SH_SLEEP | SUSP_SH_SF)
28#define SUSP_MODE_STANDBY_SF (SUSP_SH_STANDBY | SUSP_SH_SF)
29
30/*
31 * The following modes are not there yet:
32 *
33 * R-standby mode is unsupported, but will be added in the future
34 * U-standby mode is low priority since it needs bootloader hacks
35 *
36 * All modes should be tied in with cpuidle. But before that can
37 * happen we need to keep track of enabled hardware blocks so we
38 * can avoid entering sleep modes that stop clocks to hardware
39 * blocks that are in use even though the cpu core is idle.
40 */
41
42extern const unsigned char sh_mobile_standby[];
43extern const unsigned int sh_mobile_standby_size;
44
45static void sh_mobile_call_standby(unsigned long mode)
46{
47 extern void *vbr_base;
48 void *onchip_mem = (void *)0xe5200000; /* ILRAM */
49 void (*standby_onchip_mem)(unsigned long) = onchip_mem;
50
51 /* Note: Wake up from sleep may generate exceptions!
52 * Setup VBR to point to on-chip ram if self-refresh is
53 * going to be used.
54 */
55 if (mode & SUSP_SH_SF)
56 asm volatile("ldc %0, vbr" : : "r" (onchip_mem) : "memory");
57
58 /* Copy the assembly snippet to the otherwise ununsed ILRAM */
59 memcpy(onchip_mem, sh_mobile_standby, sh_mobile_standby_size);
60 wmb();
61 ctrl_barrier();
62
63 /* Let assembly snippet in on-chip memory handle the rest */
64 standby_onchip_mem(mode);
65
66 /* Put VBR back in System RAM again */
67 if (mode & SUSP_SH_SF)
68 asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
69}
70
71static int sh_pm_enter(suspend_state_t state)
72{
73 local_irq_disable();
74 set_bl_bit();
75 sh_mobile_call_standby(SUSP_MODE_STANDBY_SF);
76 local_irq_disable();
77 clear_bl_bit();
78 return 0;
79}
80
81static struct platform_suspend_ops sh_pm_ops = {
82 .enter = sh_pm_enter,
83 .valid = suspend_valid_only_mem,
84};
85
86static int __init sh_pm_init(void)
87{
88 suspend_set_ops(&sh_pm_ops);
89 return 0;
90}
91
92late_initcall(sh_pm_init);
diff --git a/arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S b/arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S
new file mode 100644
index 000000000000..5d888ef53d82
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S
@@ -0,0 +1,125 @@
1/*
2 * arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S
3 *
4 * Sleep mode and Standby modes support for SuperH Mobile
5 *
6 * Copyright (C) 2009 Magnus Damm
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
10 * for more details.
11 */
12
13#include <linux/sys.h>
14#include <linux/errno.h>
15#include <linux/linkage.h>
16#include <asm/asm-offsets.h>
17#include <asm/suspend.h>
18
19/* manage self-refresh and enter standby mode.
20 * this code will be copied to on-chip memory and executed from there.
21 */
22
23 .balign 4096,0,4096
24ENTRY(sh_mobile_standby)
25 mov r4, r0
26
27 tst #SUSP_SH_SF, r0
28 bt skip_set_sf
29
30 /* SDRAM: disable power down and put in self-refresh mode */
31 mov.l 1f, r4
32 mov.l 2f, r1
33 mov.l @r4, r2
34 or r1, r2
35 mov.l 3f, r3
36 and r3, r2
37 mov.l r2, @r4
38
39skip_set_sf:
40 tst #SUSP_SH_SLEEP, r0
41 bt test_standby
42
43 /* set mode to "sleep mode" */
44 bra do_sleep
45 mov #0x00, r1
46
47test_standby:
48 tst #SUSP_SH_STANDBY, r0
49 bt test_rstandby
50
51 /* set mode to "software standby mode" */
52 bra do_sleep
53 mov #0x80, r1
54
55test_rstandby:
56 tst #SUSP_SH_RSTANDBY, r0
57 bt test_ustandby
58
59 /* set mode to "r-standby mode" */
60 bra do_sleep
61 mov #0x20, r1
62
63test_ustandby:
64 tst #SUSP_SH_USTANDBY, r0
65 bt done_sleep
66
67 /* set mode to "u-standby mode" */
68 mov #0x10, r1
69
70 /* fall-through */
71
72do_sleep:
73 /* setup and enter selected standby mode */
74 mov.l 5f, r4
75 mov.l r1, @r4
76 sleep
77
78done_sleep:
79 /* reset standby mode to sleep mode */
80 mov.l 5f, r4
81 mov #0x00, r1
82 mov.l r1, @r4
83
84 tst #SUSP_SH_SF, r0
85 bt skip_restore_sf
86
87 /* SDRAM: set auto-refresh mode */
88 mov.l 1f, r4
89 mov.l @r4, r2
90 mov.l 4f, r3
91 and r3, r2
92 mov.l r2, @r4
93 mov.l 6f, r4
94 mov.l 7f, r1
95 mov.l 8f, r2
96 mov.l @r4, r3
97 mov #-1, r4
98 add r4, r3
99 or r2, r3
100 mov.l r3, @r1
101skip_restore_sf:
102 rts
103 nop
104
105 .balign 4
1061: .long 0xfe400008 /* SDCR0 */
1072: .long 0x00000400
1083: .long 0xffff7fff
1094: .long 0xfffffbff
1105: .long 0xa4150020 /* STBCR */
1116: .long 0xfe40001c /* RTCOR */
1127: .long 0xfe400018 /* RTCNT */
1138: .long 0xa55a0000
114
115/* interrupt vector @ 0x600 */
116 .balign 0x400,0,0x400
117 .long 0xdeadbeef
118 .balign 0x200,0,0x200
119 /* sh7722 will end up here in sleep mode */
120 rte
121 nop
122sh_mobile_standby_end:
123
124ENTRY(sh_mobile_standby_size)
125 .long sh_mobile_standby_end - sh_mobile_standby
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-01 16:09:21 -0500