Merge branch 'broonie/spi-next' of git://git.kernel.org/pub/scm/linux/kernel/git...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm / mach-imx / pm-imx6q.c
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
22 #include "common.h"
23 #include "hardware.h"
24
25 extern unsigned long phys_l2x0_saved_regs;
26
27 static int imx6q_suspend_finish(unsigned long val)
28 {
29 cpu_do_idle();
30 return 0;
31 }
32
33 static int imx6q_pm_enter(suspend_state_t state)
34 {
35 switch (state) {
36 case PM_SUSPEND_MEM:
37 imx6q_set_lpm(STOP_POWER_OFF);
38 imx_gpc_pre_suspend();
39 imx_set_cpu_jump(0, v7_cpu_resume);
40 /* Zzz ... */
41 cpu_suspend(0, imx6q_suspend_finish);
42 imx_smp_prepare();
43 imx_gpc_post_resume();
44 imx6q_set_lpm(WAIT_CLOCKED);
45 break;
46 default:
47 return -EINVAL;
48 }
49
50 return 0;
51 }
52
53 static const struct platform_suspend_ops imx6q_pm_ops = {
54 .enter = imx6q_pm_enter,
55 .valid = suspend_valid_only_mem,
56 };
57
58 void __init imx6q_pm_init(void)
59 {
60 /*
61 * The l2x0 core code provides an infrastucture to save and restore
62 * l2x0 registers across suspend/resume cycle. But because imx6q
63 * retains L2 content during suspend and needs to resume L2 before
64 * MMU is enabled, it can only utilize register saving support and
65 * have to take care of restoring on its own. So we save physical
66 * address of the data structure used by l2x0 core to save registers,
67 * and later restore the necessary ones in imx6q resume entry.
68 */
69 #ifdef CONFIG_CACHE_L2X0
70 phys_l2x0_saved_regs = __pa(&l2x0_saved_regs);
71 #endif
72
73 suspend_set_ops(&imx6q_pm_ops);
74 }