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