2 * PXA250/210 Power Management Routines
4 * Original code for the SA11x0:
5 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
7 * Modified for the PXA250 by Nicolas Pitre:
8 * Copyright (c) 2002 Monta Vista Software, Inc.
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License.
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/suspend.h>
16 #include <linux/errno.h>
17 #include <linux/time.h>
19 #include <asm/hardware.h>
20 #include <asm/memory.h>
21 #include <asm/system.h>
22 #include <asm/arch/pm.h>
23 #include <asm/arch/pxa-regs.h>
24 #include <asm/arch/lubbock.h>
25 #include <asm/mach/time.h>
33 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
34 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
36 #define RESTORE_GPLEVEL(n) do { \
37 GPSR##n = sleep_save[SLEEP_SAVE_GPLR##n]; \
38 GPCR##n = ~sleep_save[SLEEP_SAVE_GPLR##n]; \
42 * List of global PXA peripheral registers to preserve.
43 * More ones like CP and general purpose register values are preserved
44 * with the stack pointer in sleep.S.
46 enum { SLEEP_SAVE_START
= 0,
48 SLEEP_SAVE_GPLR0
, SLEEP_SAVE_GPLR1
, SLEEP_SAVE_GPLR2
, SLEEP_SAVE_GPLR3
,
49 SLEEP_SAVE_GPDR0
, SLEEP_SAVE_GPDR1
, SLEEP_SAVE_GPDR2
, SLEEP_SAVE_GPDR3
,
50 SLEEP_SAVE_GRER0
, SLEEP_SAVE_GRER1
, SLEEP_SAVE_GRER2
, SLEEP_SAVE_GRER3
,
51 SLEEP_SAVE_GFER0
, SLEEP_SAVE_GFER1
, SLEEP_SAVE_GFER2
, SLEEP_SAVE_GFER3
,
52 SLEEP_SAVE_PGSR0
, SLEEP_SAVE_PGSR1
, SLEEP_SAVE_PGSR2
, SLEEP_SAVE_PGSR3
,
54 SLEEP_SAVE_GAFR0_L
, SLEEP_SAVE_GAFR0_U
,
55 SLEEP_SAVE_GAFR1_L
, SLEEP_SAVE_GAFR1_U
,
56 SLEEP_SAVE_GAFR2_L
, SLEEP_SAVE_GAFR2_U
,
57 SLEEP_SAVE_GAFR3_L
, SLEEP_SAVE_GAFR3_U
,
66 SLEEP_SAVE_PWER
, SLEEP_SAVE_PCFR
, SLEEP_SAVE_PRER
,
67 SLEEP_SAVE_PFER
, SLEEP_SAVE_PKWR
,
76 int pxa_pm_enter(suspend_state_t state
)
78 unsigned long sleep_save
[SLEEP_SAVE_SIZE
];
79 unsigned long checksum
= 0;
81 extern void pxa_cpu_pm_enter(suspend_state_t state
);
84 /* force any iWMMXt context to ram **/
85 if (elf_hwcap
& HWCAP_IWMMXT
)
86 iwmmxt_task_disable(NULL
);
89 SAVE(GPLR0
); SAVE(GPLR1
); SAVE(GPLR2
);
90 SAVE(GPDR0
); SAVE(GPDR1
); SAVE(GPDR2
);
91 SAVE(GRER0
); SAVE(GRER1
); SAVE(GRER2
);
92 SAVE(GFER0
); SAVE(GFER1
); SAVE(GFER2
);
93 SAVE(PGSR0
); SAVE(PGSR1
); SAVE(PGSR2
);
95 SAVE(GAFR0_L
); SAVE(GAFR0_U
);
96 SAVE(GAFR1_L
); SAVE(GAFR1_U
);
97 SAVE(GAFR2_L
); SAVE(GAFR2_U
);
101 SAVE(GPLR3
); SAVE(GPDR3
); SAVE(GRER3
); SAVE(GFER3
); SAVE(PGSR3
);
102 SAVE(GAFR3_L
); SAVE(GAFR3_U
);
103 SAVE(PWER
); SAVE(PCFR
); SAVE(PRER
);
104 SAVE(PFER
); SAVE(PKWR
);
113 /* Note: wake up source are set up in each machine specific files */
115 /* clear GPIO transition detect bits */
116 GEDR0
= GEDR0
; GEDR1
= GEDR1
; GEDR2
= GEDR2
;
121 /* Clear sleep reset status */
124 /* before sleeping, calculate and save a checksum */
125 for (i
= 0; i
< SLEEP_SAVE_SIZE
- 1; i
++)
126 checksum
+= sleep_save
[i
];
127 sleep_save
[SLEEP_SAVE_CKSUM
] = checksum
;
130 pxa_cpu_pm_enter(state
);
134 /* after sleeping, validate the checksum */
136 for (i
= 0; i
< SLEEP_SAVE_SIZE
- 1; i
++)
137 checksum
+= sleep_save
[i
];
139 /* if invalid, display message and wait for a hardware reset */
140 if (checksum
!= sleep_save
[SLEEP_SAVE_CKSUM
]) {
141 #ifdef CONFIG_ARCH_LUBBOCK
142 LUB_HEXLED
= 0xbadbadc5;
145 pxa_cpu_pm_enter(state
);
148 /* ensure not to come back here if it wasn't intended */
151 /* restore registers */
152 RESTORE_GPLEVEL(0); RESTORE_GPLEVEL(1); RESTORE_GPLEVEL(2);
153 RESTORE(GPDR0
); RESTORE(GPDR1
); RESTORE(GPDR2
);
154 RESTORE(GAFR0_L
); RESTORE(GAFR0_U
);
155 RESTORE(GAFR1_L
); RESTORE(GAFR1_U
);
156 RESTORE(GAFR2_L
); RESTORE(GAFR2_U
);
157 RESTORE(GRER0
); RESTORE(GRER1
); RESTORE(GRER2
);
158 RESTORE(GFER0
); RESTORE(GFER1
); RESTORE(GFER2
);
159 RESTORE(PGSR0
); RESTORE(PGSR1
); RESTORE(PGSR2
);
163 RESTORE_GPLEVEL(3); RESTORE(GPDR3
);
164 RESTORE(GAFR3_L
); RESTORE(GAFR3_U
);
165 RESTORE(GRER3
); RESTORE(GFER3
); RESTORE(PGSR3
);
166 RESTORE(PWER
); RESTORE(PCFR
); RESTORE(PRER
);
167 RESTORE(PFER
); RESTORE(PKWR
);
170 PSSR
= PSSR_RDH
| PSSR_PH
;
181 printk(KERN_DEBUG
"*** made it back from resume\n");
187 EXPORT_SYMBOL_GPL(pxa_pm_enter
);
189 unsigned long sleep_phys_sp(void *sp
)
191 return virt_to_phys(sp
);