| Lee Jones | f0745f3 | 2014-07-22 15:52:28 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2014 STMicroelectronics |
| 3 | * |
| 4 | * Power off Restart driver, used in STMicroelectronics devices. |
| 5 | * |
| 6 | * Author: Christophe Kerello <christophe.kerello@st.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2, as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/of.h> |
| 15 | #include <linux/of_platform.h> |
| 16 | #include <linux/platform_device.h> |
| 17 | #include <linux/mfd/syscon.h> |
| 18 | #include <linux/regmap.h> |
| 19 | |
| 20 | #include <asm/system_misc.h> |
| 21 | |
| 22 | struct reset_syscfg { |
| 23 | struct regmap *regmap; |
| 24 | /* syscfg used for reset */ |
| 25 | unsigned int offset_rst; |
| 26 | unsigned int mask_rst; |
| 27 | /* syscfg used for unmask the reset */ |
| 28 | unsigned int offset_rst_msk; |
| 29 | unsigned int mask_rst_msk; |
| 30 | }; |
| 31 | |
| 32 | /* STiH415 */ |
| 33 | #define STIH415_SYSCFG_11 0x2c |
| 34 | #define STIH415_SYSCFG_15 0x3c |
| 35 | |
| 36 | static struct reset_syscfg stih415_reset = { |
| 37 | .offset_rst = STIH415_SYSCFG_11, |
| 38 | .mask_rst = BIT(0), |
| 39 | .offset_rst_msk = STIH415_SYSCFG_15, |
| 40 | .mask_rst_msk = BIT(0) |
| 41 | }; |
| 42 | |
| 43 | /* STiH416 */ |
| 44 | #define STIH416_SYSCFG_500 0x7d0 |
| 45 | #define STIH416_SYSCFG_504 0x7e0 |
| 46 | |
| 47 | static struct reset_syscfg stih416_reset = { |
| 48 | .offset_rst = STIH416_SYSCFG_500, |
| 49 | .mask_rst = BIT(0), |
| 50 | .offset_rst_msk = STIH416_SYSCFG_504, |
| 51 | .mask_rst_msk = BIT(0) |
| 52 | }; |
| 53 | |
| 54 | /* STiH407 */ |
| 55 | #define STIH407_SYSCFG_4000 0x0 |
| 56 | #define STIH407_SYSCFG_4008 0x20 |
| 57 | |
| 58 | static struct reset_syscfg stih407_reset = { |
| 59 | .offset_rst = STIH407_SYSCFG_4000, |
| 60 | .mask_rst = BIT(0), |
| 61 | .offset_rst_msk = STIH407_SYSCFG_4008, |
| 62 | .mask_rst_msk = BIT(0) |
| 63 | }; |
| 64 | |
| 65 | /* STiD127 */ |
| 66 | #define STID127_SYSCFG_700 0x0 |
| 67 | #define STID127_SYSCFG_773 0x124 |
| 68 | |
| 69 | static struct reset_syscfg stid127_reset = { |
| 70 | .offset_rst = STID127_SYSCFG_773, |
| 71 | .mask_rst = BIT(0), |
| 72 | .offset_rst_msk = STID127_SYSCFG_700, |
| 73 | .mask_rst_msk = BIT(8) |
| 74 | }; |
| 75 | |
| 76 | static struct reset_syscfg *st_restart_syscfg; |
| 77 | |
| 78 | static void st_restart(enum reboot_mode reboot_mode, const char *cmd) |
| 79 | { |
| 80 | /* reset syscfg updated */ |
| 81 | regmap_update_bits(st_restart_syscfg->regmap, |
| 82 | st_restart_syscfg->offset_rst, |
| 83 | st_restart_syscfg->mask_rst, |
| 84 | 0); |
| 85 | |
| 86 | /* unmask the reset */ |
| 87 | regmap_update_bits(st_restart_syscfg->regmap, |
| 88 | st_restart_syscfg->offset_rst_msk, |
| 89 | st_restart_syscfg->mask_rst_msk, |
| 90 | 0); |
| 91 | } |
| 92 | |
| 93 | static struct of_device_id st_reset_of_match[] = { |
| 94 | { |
| 95 | .compatible = "st,stih415-restart", |
| 96 | .data = (void *)&stih415_reset, |
| 97 | }, { |
| 98 | .compatible = "st,stih416-restart", |
| 99 | .data = (void *)&stih416_reset, |
| 100 | }, { |
| 101 | .compatible = "st,stih407-restart", |
| 102 | .data = (void *)&stih407_reset, |
| 103 | }, { |
| 104 | .compatible = "st,stid127-restart", |
| 105 | .data = (void *)&stid127_reset, |
| 106 | }, |
| 107 | {} |
| 108 | }; |
| 109 | |
| 110 | static int st_reset_probe(struct platform_device *pdev) |
| 111 | { |
| 112 | struct device_node *np = pdev->dev.of_node; |
| 113 | const struct of_device_id *match; |
| 114 | struct device *dev = &pdev->dev; |
| 115 | |
| 116 | match = of_match_device(st_reset_of_match, dev); |
| 117 | if (!match) |
| 118 | return -ENODEV; |
| 119 | |
| 120 | st_restart_syscfg = (struct reset_syscfg *)match->data; |
| 121 | |
| 122 | st_restart_syscfg->regmap = |
| 123 | syscon_regmap_lookup_by_phandle(np, "st,syscfg"); |
| 124 | if (IS_ERR(st_restart_syscfg->regmap)) { |
| 125 | dev_err(dev, "No syscfg phandle specified\n"); |
| 126 | return PTR_ERR(st_restart_syscfg->regmap); |
| 127 | } |
| 128 | |
| 129 | arm_pm_restart = st_restart; |
| 130 | |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | static struct platform_driver st_reset_driver = { |
| 135 | .probe = st_reset_probe, |
| 136 | .driver = { |
| 137 | .name = "st_reset", |
| 138 | .of_match_table = st_reset_of_match, |
| 139 | }, |
| 140 | }; |
| 141 | |
| 142 | static int __init st_reset_init(void) |
| 143 | { |
| 144 | return platform_driver_register(&st_reset_driver); |
| 145 | } |
| 146 | |
| 147 | device_initcall(st_reset_init); |
| 148 | |
| 149 | MODULE_AUTHOR("Christophe Kerello <christophe.kerello@st.com>"); |
| 150 | MODULE_DESCRIPTION("STMicroelectronics Power off Restart driver"); |
| 151 | MODULE_LICENSE("GPL v2"); |