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a1f1c7ef SG |
1 | /* |
2 | * Copyright 2011 Freescale Semiconductor, Inc. | |
3 | * Copyright 2011 Linaro Ltd. | |
4 | * | |
5 | * The code contained herein is licensed under the GNU General Public | |
6 | * License. You may obtain a copy of the GNU General Public License | |
7 | * Version 2 or later at the following locations: | |
8 | * | |
9 | * http://www.opensource.org/licenses/gpl-license.html | |
10 | * http://www.gnu.org/copyleft/gpl.html | |
11 | */ | |
12 | ||
13 | #include <linux/init.h> | |
14 | #include <linux/io.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/suspend.h> | |
17 | #include <asm/cacheflush.h> | |
18 | #include <asm/proc-fns.h> | |
19 | #include <asm/suspend.h> | |
20 | #include <asm/hardware/cache-l2x0.h> | |
21 | #include <mach/common.h> | |
22 | #include <mach/hardware.h> | |
23 | ||
24 | extern unsigned long phys_l2x0_saved_regs; | |
25 | ||
26 | static int imx6q_suspend_finish(unsigned long val) | |
27 | { | |
28 | cpu_do_idle(); | |
29 | return 0; | |
30 | } | |
31 | ||
32 | static int imx6q_pm_enter(suspend_state_t state) | |
33 | { | |
34 | switch (state) { | |
35 | case PM_SUSPEND_MEM: | |
36 | imx6q_set_lpm(STOP_POWER_OFF); | |
37 | imx_gpc_pre_suspend(); | |
38 | imx_set_cpu_jump(0, v7_cpu_resume); | |
39 | /* Zzz ... */ | |
40 | cpu_suspend(0, imx6q_suspend_finish); | |
41 | imx_smp_prepare(); | |
42 | imx_gpc_post_resume(); | |
43 | break; | |
44 | default: | |
45 | return -EINVAL; | |
46 | } | |
47 | ||
48 | return 0; | |
49 | } | |
50 | ||
51 | static const struct platform_suspend_ops imx6q_pm_ops = { | |
52 | .enter = imx6q_pm_enter, | |
53 | .valid = suspend_valid_only_mem, | |
54 | }; | |
55 | ||
56 | void __init imx6q_pm_init(void) | |
57 | { | |
58 | /* | |
59 | * The l2x0 core code provides an infrastucture to save and restore | |
60 | * l2x0 registers across suspend/resume cycle. But because imx6q | |
61 | * retains L2 content during suspend and needs to resume L2 before | |
62 | * MMU is enabled, it can only utilize register saving support and | |
63 | * have to take care of restoring on its own. So we save physical | |
64 | * address of the data structure used by l2x0 core to save registers, | |
65 | * and later restore the necessary ones in imx6q resume entry. | |
66 | */ | |
67 | phys_l2x0_saved_regs = __pa(&l2x0_saved_regs); | |
68 | ||
69 | suspend_set_ops(&imx6q_pm_ops); | |
70 | } |