projects / deliverable / linux.git / blame
| 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 | } |