Sekhar Nori | efc1bb8 | 2009-12-17 18:29:31 +0530 | [diff] [blame] | 1 | /* |
| 2 | * DaVinci Power Management Routines |
| 3 | * |
| 4 | * Copyright (C) 2009 Texas Instruments, Inc. http://www.ti.com/ |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/pm.h> |
| 12 | #include <linux/suspend.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/clk.h> |
| 16 | #include <linux/spinlock.h> |
| 17 | |
| 18 | #include <asm/cacheflush.h> |
| 19 | #include <asm/delay.h> |
Alexey Dobriyan | b7f080c | 2011-06-16 11:01:34 +0000 | [diff] [blame] | 20 | #include <asm/io.h> |
Sekhar Nori | efc1bb8 | 2009-12-17 18:29:31 +0530 | [diff] [blame] | 21 | |
Sekhar Nori | 215a084 | 2013-04-10 14:57:15 +0530 | [diff] [blame] | 22 | #include <mach/common.h> |
Sekhar Nori | efc1bb8 | 2009-12-17 18:29:31 +0530 | [diff] [blame] | 23 | #include <mach/da8xx.h> |
| 24 | #include <mach/sram.h> |
| 25 | #include <mach/pm.h> |
| 26 | |
| 27 | #include "clock.h" |
| 28 | |
| 29 | #define DEEPSLEEP_SLEEPCOUNT_MASK 0xFFFF |
| 30 | |
| 31 | static void (*davinci_sram_suspend) (struct davinci_pm_config *); |
| 32 | static struct davinci_pm_config *pdata; |
| 33 | |
| 34 | static void davinci_sram_push(void *dest, void *src, unsigned int size) |
| 35 | { |
| 36 | memcpy(dest, src, size); |
| 37 | flush_icache_range((unsigned long)dest, (unsigned long)(dest + size)); |
| 38 | } |
| 39 | |
| 40 | static void davinci_pm_suspend(void) |
| 41 | { |
| 42 | unsigned val; |
| 43 | |
| 44 | if (pdata->cpupll_reg_base != pdata->ddrpll_reg_base) { |
| 45 | |
| 46 | /* Switch CPU PLL to bypass mode */ |
| 47 | val = __raw_readl(pdata->cpupll_reg_base + PLLCTL); |
| 48 | val &= ~(PLLCTL_PLLENSRC | PLLCTL_PLLEN); |
| 49 | __raw_writel(val, pdata->cpupll_reg_base + PLLCTL); |
| 50 | |
| 51 | udelay(PLL_BYPASS_TIME); |
| 52 | |
| 53 | /* Powerdown CPU PLL */ |
| 54 | val = __raw_readl(pdata->cpupll_reg_base + PLLCTL); |
| 55 | val |= PLLCTL_PLLPWRDN; |
| 56 | __raw_writel(val, pdata->cpupll_reg_base + PLLCTL); |
| 57 | } |
| 58 | |
| 59 | /* Configure sleep count in deep sleep register */ |
| 60 | val = __raw_readl(pdata->deepsleep_reg); |
| 61 | val &= ~DEEPSLEEP_SLEEPCOUNT_MASK, |
| 62 | val |= pdata->sleepcount; |
| 63 | __raw_writel(val, pdata->deepsleep_reg); |
| 64 | |
| 65 | /* System goes to sleep in this call */ |
| 66 | davinci_sram_suspend(pdata); |
| 67 | |
| 68 | if (pdata->cpupll_reg_base != pdata->ddrpll_reg_base) { |
| 69 | |
| 70 | /* put CPU PLL in reset */ |
| 71 | val = __raw_readl(pdata->cpupll_reg_base + PLLCTL); |
| 72 | val &= ~PLLCTL_PLLRST; |
| 73 | __raw_writel(val, pdata->cpupll_reg_base + PLLCTL); |
| 74 | |
| 75 | /* put CPU PLL in power down */ |
| 76 | val = __raw_readl(pdata->cpupll_reg_base + PLLCTL); |
| 77 | val &= ~PLLCTL_PLLPWRDN; |
| 78 | __raw_writel(val, pdata->cpupll_reg_base + PLLCTL); |
| 79 | |
| 80 | /* wait for CPU PLL reset */ |
| 81 | udelay(PLL_RESET_TIME); |
| 82 | |
| 83 | /* bring CPU PLL out of reset */ |
| 84 | val = __raw_readl(pdata->cpupll_reg_base + PLLCTL); |
| 85 | val |= PLLCTL_PLLRST; |
| 86 | __raw_writel(val, pdata->cpupll_reg_base + PLLCTL); |
| 87 | |
| 88 | /* Wait for CPU PLL to lock */ |
| 89 | udelay(PLL_LOCK_TIME); |
| 90 | |
| 91 | /* Remove CPU PLL from bypass mode */ |
| 92 | val = __raw_readl(pdata->cpupll_reg_base + PLLCTL); |
| 93 | val &= ~PLLCTL_PLLENSRC; |
| 94 | val |= PLLCTL_PLLEN; |
| 95 | __raw_writel(val, pdata->cpupll_reg_base + PLLCTL); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | static int davinci_pm_enter(suspend_state_t state) |
| 100 | { |
| 101 | int ret = 0; |
| 102 | |
| 103 | switch (state) { |
| 104 | case PM_SUSPEND_STANDBY: |
| 105 | case PM_SUSPEND_MEM: |
| 106 | davinci_pm_suspend(); |
| 107 | break; |
| 108 | default: |
| 109 | ret = -EINVAL; |
| 110 | } |
| 111 | |
| 112 | return ret; |
| 113 | } |
| 114 | |
Lionel Debroux | 2f55ac0 | 2010-11-16 14:14:02 +0100 | [diff] [blame] | 115 | static const struct platform_suspend_ops davinci_pm_ops = { |
Sekhar Nori | efc1bb8 | 2009-12-17 18:29:31 +0530 | [diff] [blame] | 116 | .enter = davinci_pm_enter, |
| 117 | .valid = suspend_valid_only_mem, |
| 118 | }; |
| 119 | |
| 120 | static int __init davinci_pm_probe(struct platform_device *pdev) |
| 121 | { |
| 122 | pdata = pdev->dev.platform_data; |
| 123 | if (!pdata) { |
| 124 | dev_err(&pdev->dev, "cannot get platform data\n"); |
| 125 | return -ENOENT; |
| 126 | } |
| 127 | |
| 128 | davinci_sram_suspend = sram_alloc(davinci_cpu_suspend_sz, NULL); |
| 129 | if (!davinci_sram_suspend) { |
| 130 | dev_err(&pdev->dev, "cannot allocate SRAM memory\n"); |
| 131 | return -ENOMEM; |
| 132 | } |
| 133 | |
| 134 | davinci_sram_push(davinci_sram_suspend, davinci_cpu_suspend, |
| 135 | davinci_cpu_suspend_sz); |
| 136 | |
| 137 | suspend_set_ops(&davinci_pm_ops); |
| 138 | |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | static int __exit davinci_pm_remove(struct platform_device *pdev) |
| 143 | { |
| 144 | sram_free(davinci_sram_suspend, davinci_cpu_suspend_sz); |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | static struct platform_driver davinci_pm_driver = { |
| 149 | .driver = { |
| 150 | .name = "pm-davinci", |
Sekhar Nori | efc1bb8 | 2009-12-17 18:29:31 +0530 | [diff] [blame] | 151 | }, |
| 152 | .remove = __exit_p(davinci_pm_remove), |
| 153 | }; |
| 154 | |
Shawn Guo | 3aa3e84 | 2012-04-26 09:45:39 +0800 | [diff] [blame] | 155 | int __init davinci_pm_init(void) |
Sekhar Nori | efc1bb8 | 2009-12-17 18:29:31 +0530 | [diff] [blame] | 156 | { |
| 157 | return platform_driver_probe(&davinci_pm_driver, davinci_pm_probe); |
| 158 | } |