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e1cb367d EG |
1 | /* |
2 | * Power Management driver for Marvell Kirkwood SoCs | |
3 | * | |
4 | * Copyright (C) 2013 Ezequiel Garcia <ezequiel@free-electrons.com> | |
5 | * Copyright (C) 2010 Simon Guinot <sguinot@lacie.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License, | |
9 | * version 2 of the License. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/suspend.h> | |
19 | #include <linux/io.h> | |
20 | #include <mach/bridge-regs.h> | |
21 | ||
22 | static void __iomem *ddr_operation_base; | |
23 | ||
24 | static void kirkwood_low_power(void) | |
25 | { | |
26 | u32 mem_pm_ctrl; | |
27 | ||
28 | mem_pm_ctrl = readl(MEMORY_PM_CTRL); | |
29 | ||
30 | /* Set peripherals to low-power mode */ | |
31 | writel_relaxed(~0, MEMORY_PM_CTRL); | |
32 | ||
33 | /* Set DDR in self-refresh */ | |
34 | writel_relaxed(0x7, ddr_operation_base); | |
35 | ||
36 | /* | |
37 | * Set CPU in wait-for-interrupt state. | |
38 | * This disables the CPU core clocks, | |
39 | * the array clocks, and also the L2 controller. | |
40 | */ | |
41 | cpu_do_idle(); | |
42 | ||
43 | writel_relaxed(mem_pm_ctrl, MEMORY_PM_CTRL); | |
44 | } | |
45 | ||
46 | static int kirkwood_suspend_enter(suspend_state_t state) | |
47 | { | |
48 | switch (state) { | |
49 | case PM_SUSPEND_STANDBY: | |
50 | kirkwood_low_power(); | |
51 | break; | |
52 | default: | |
53 | return -EINVAL; | |
54 | } | |
55 | return 0; | |
56 | } | |
57 | ||
58 | static int kirkwood_pm_valid_standby(suspend_state_t state) | |
59 | { | |
60 | return state == PM_SUSPEND_STANDBY; | |
61 | } | |
62 | ||
63 | static const struct platform_suspend_ops kirkwood_suspend_ops = { | |
64 | .enter = kirkwood_suspend_enter, | |
65 | .valid = kirkwood_pm_valid_standby, | |
66 | }; | |
67 | ||
68 | int __init kirkwood_pm_init(void) | |
69 | { | |
70 | ddr_operation_base = ioremap(DDR_OPERATION_BASE, 4); | |
71 | suspend_set_ops(&kirkwood_suspend_ops); | |
72 | return 0; | |
73 | } |