2 * Power Management driver for Marvell Kirkwood SoCs
4 * Copyright (C) 2013 Ezequiel Garcia <ezequiel@free-electrons.com>
5 * Copyright (C) 2010 Simon Guinot <sguinot@lacie.com>
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.
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.
17 #include <linux/kernel.h>
18 #include <linux/suspend.h>
20 #include <mach/bridge-regs.h>
22 static void __iomem
*ddr_operation_base
;
24 static void kirkwood_low_power(void)
28 mem_pm_ctrl
= readl(MEMORY_PM_CTRL
);
30 /* Set peripherals to low-power mode */
31 writel_relaxed(~0, MEMORY_PM_CTRL
);
33 /* Set DDR in self-refresh */
34 writel_relaxed(0x7, ddr_operation_base
);
37 * Set CPU in wait-for-interrupt state.
38 * This disables the CPU core clocks,
39 * the array clocks, and also the L2 controller.
43 writel_relaxed(mem_pm_ctrl
, MEMORY_PM_CTRL
);
46 static int kirkwood_suspend_enter(suspend_state_t state
)
49 case PM_SUSPEND_STANDBY
:
58 static int kirkwood_pm_valid_standby(suspend_state_t state
)
60 return state
== PM_SUSPEND_STANDBY
;
63 static const struct platform_suspend_ops kirkwood_suspend_ops
= {
64 .enter
= kirkwood_suspend_enter
,
65 .valid
= kirkwood_pm_valid_standby
,
68 int __init
kirkwood_pm_init(void)
70 ddr_operation_base
= ioremap(DDR_OPERATION_BASE
, 4);
71 suspend_set_ops(&kirkwood_suspend_ops
);