Commit | Line | Data |
---|---|---|
ba5a37e5 AL |
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> | |
c3f08d0d | 20 | #include "kirkwood.h" |
ba5a37e5 AL |
21 | |
22 | static void __iomem *ddr_operation_base; | |
23 | static void __iomem *memory_pm_ctrl; | |
24 | ||
25 | static void kirkwood_low_power(void) | |
26 | { | |
27 | u32 mem_pm_ctrl; | |
28 | ||
29 | mem_pm_ctrl = readl(memory_pm_ctrl); | |
30 | ||
31 | /* Set peripherals to low-power mode */ | |
32 | writel_relaxed(~0, memory_pm_ctrl); | |
33 | ||
34 | /* Set DDR in self-refresh */ | |
35 | writel_relaxed(0x7, ddr_operation_base); | |
36 | ||
37 | /* | |
38 | * Set CPU in wait-for-interrupt state. | |
39 | * This disables the CPU core clocks, | |
40 | * the array clocks, and also the L2 controller. | |
41 | */ | |
42 | cpu_do_idle(); | |
43 | ||
44 | writel_relaxed(mem_pm_ctrl, memory_pm_ctrl); | |
45 | } | |
46 | ||
47 | static int kirkwood_suspend_enter(suspend_state_t state) | |
48 | { | |
49 | switch (state) { | |
50 | case PM_SUSPEND_STANDBY: | |
51 | kirkwood_low_power(); | |
52 | break; | |
53 | default: | |
54 | return -EINVAL; | |
55 | } | |
56 | return 0; | |
57 | } | |
58 | ||
59 | static int kirkwood_pm_valid_standby(suspend_state_t state) | |
60 | { | |
61 | return state == PM_SUSPEND_STANDBY; | |
62 | } | |
63 | ||
64 | static const struct platform_suspend_ops kirkwood_suspend_ops = { | |
65 | .enter = kirkwood_suspend_enter, | |
66 | .valid = kirkwood_pm_valid_standby, | |
67 | }; | |
68 | ||
69 | int __init kirkwood_pm_init(void) | |
70 | { | |
71 | ddr_operation_base = ioremap(DDR_OPERATION_BASE, 4); | |
72 | memory_pm_ctrl = ioremap(MEMORY_PM_CTRL_PHYS, 4); | |
73 | ||
74 | suspend_set_ops(&kirkwood_suspend_ops); | |
75 | return 0; | |
76 | } |