| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Power Management driver for Marvell Kirkwood SoCs |
| * |
| * Copyright (C) 2013 Ezequiel Garcia <ezequiel@free-electrons.com> |
| * Copyright (C) 2010 Simon Guinot <sguinot@lacie.com> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/suspend.h> |
| #include <linux/io.h> |
| #include "kirkwood.h" |
| #include "kirkwood-pm.h" |
| |
| static void __iomem *ddr_operation_base; |
| static void __iomem *memory_pm_ctrl; |
| |
| static void kirkwood_low_power(void) |
| { |
| u32 mem_pm_ctrl; |
| |
| mem_pm_ctrl = readl(memory_pm_ctrl); |
| |
| /* Set peripherals to low-power mode */ |
| writel_relaxed(~0, memory_pm_ctrl); |
| |
| /* Set DDR in self-refresh */ |
| writel_relaxed(0x7, ddr_operation_base); |
| |
| /* |
| * Set CPU in wait-for-interrupt state. |
| * This disables the CPU core clocks, |
| * the array clocks, and also the L2 controller. |
| */ |
| cpu_do_idle(); |
| |
| writel_relaxed(mem_pm_ctrl, memory_pm_ctrl); |
| } |
| |
| static int kirkwood_suspend_enter(suspend_state_t state) |
| { |
| switch (state) { |
| case PM_SUSPEND_STANDBY: |
| kirkwood_low_power(); |
| break; |
| default: |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static int kirkwood_pm_valid_standby(suspend_state_t state) |
| { |
| return state == PM_SUSPEND_STANDBY; |
| } |
| |
| static const struct platform_suspend_ops kirkwood_suspend_ops = { |
| .enter = kirkwood_suspend_enter, |
| .valid = kirkwood_pm_valid_standby, |
| }; |
| |
| void __init kirkwood_pm_init(void) |
| { |
| ddr_operation_base = ioremap(DDR_OPERATION_BASE, 4); |
| memory_pm_ctrl = ioremap(MEMORY_PM_CTRL_PHYS, 4); |
| |
| suspend_set_ops(&kirkwood_suspend_ops); |
| } |