projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| f0745f36 LJ |
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> | |
| 453fe4f1 | 18 | #include <linux/reboot.h> |
| f0745f36 LJ |
19 | #include <linux/regmap.h> |
| 20 | ||
| f0745f36 LJ |
21 | struct reset_syscfg { |
| 22 | struct regmap *regmap; | |
| 23 | /* syscfg used for reset */ | |
| 24 | unsigned int offset_rst; | |
| 25 | unsigned int mask_rst; | |
| 26 | /* syscfg used for unmask the reset */ | |
| 27 | unsigned int offset_rst_msk; | |
| 28 | unsigned int mask_rst_msk; | |
| 29 | }; | |
| 30 | ||
| 31 | /* STiH415 */ | |
| 32 | #define STIH415_SYSCFG_11 0x2c | |
| 33 | #define STIH415_SYSCFG_15 0x3c | |
| 34 | ||
| 35 | static struct reset_syscfg stih415_reset = { | |
| 36 | .offset_rst = STIH415_SYSCFG_11, | |
| 37 | .mask_rst = BIT(0), | |
| 38 | .offset_rst_msk = STIH415_SYSCFG_15, | |
| 39 | .mask_rst_msk = BIT(0) | |
| 40 | }; | |
| 41 | ||
| 42 | /* STiH416 */ | |
| 43 | #define STIH416_SYSCFG_500 0x7d0 | |
| 44 | #define STIH416_SYSCFG_504 0x7e0 | |
| 45 | ||
| 46 | static struct reset_syscfg stih416_reset = { | |
| 47 | .offset_rst = STIH416_SYSCFG_500, | |
| 48 | .mask_rst = BIT(0), | |
| 49 | .offset_rst_msk = STIH416_SYSCFG_504, | |
| 50 | .mask_rst_msk = BIT(0) | |
| 51 | }; | |
| 52 | ||
| 53 | /* STiH407 */ | |
| 54 | #define STIH407_SYSCFG_4000 0x0 | |
| 55 | #define STIH407_SYSCFG_4008 0x20 | |
| 56 | ||
| 57 | static struct reset_syscfg stih407_reset = { | |
| 58 | .offset_rst = STIH407_SYSCFG_4000, | |
| 59 | .mask_rst = BIT(0), | |
| 60 | .offset_rst_msk = STIH407_SYSCFG_4008, | |
| 61 | .mask_rst_msk = BIT(0) | |
| 62 | }; | |
| 63 | ||
| 64 | /* STiD127 */ | |
| 65 | #define STID127_SYSCFG_700 0x0 | |
| 66 | #define STID127_SYSCFG_773 0x124 | |
| 67 | ||
| 68 | static struct reset_syscfg stid127_reset = { | |
| 69 | .offset_rst = STID127_SYSCFG_773, | |
| 70 | .mask_rst = BIT(0), | |
| 71 | .offset_rst_msk = STID127_SYSCFG_700, | |
| 72 | .mask_rst_msk = BIT(8) | |
| 73 | }; | |
| 74 | ||
| 75 | static struct reset_syscfg *st_restart_syscfg; | |
| 76 | ||
| 453fe4f1 GR |
77 | static int st_restart(struct notifier_block *this, unsigned long mode, |
| 78 | void *cmd) | |
| f0745f36 LJ |
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); | |
| 453fe4f1 GR |
91 | |
| 92 | return NOTIFY_DONE; | |
| f0745f36 LJ |
93 | } |
| 94 | ||
| 453fe4f1 GR |
95 | static struct notifier_block st_restart_nb = { |
| 96 | .notifier_call = st_restart, | |
| 97 | .priority = 192, | |
| 98 | }; | |
| 99 | ||
| 8fb08855 | 100 | static const struct of_device_id st_reset_of_match[] = { |
| f0745f36 LJ |
101 | { |
| 102 | .compatible = "st,stih415-restart", | |
| 103 | .data = (void *)&stih415_reset, | |
| 104 | }, { | |
| 105 | .compatible = "st,stih416-restart", | |
| 106 | .data = (void *)&stih416_reset, | |
| 107 | }, { | |
| 108 | .compatible = "st,stih407-restart", | |
| 109 | .data = (void *)&stih407_reset, | |
| 110 | }, { | |
| 111 | .compatible = "st,stid127-restart", | |
| 112 | .data = (void *)&stid127_reset, | |
| 113 | }, | |
| 114 | {} | |
| 115 | }; | |
| 116 | ||
| 117 | static int st_reset_probe(struct platform_device *pdev) | |
| 118 | { | |
| 119 | struct device_node *np = pdev->dev.of_node; | |
| 120 | const struct of_device_id *match; | |
| 121 | struct device *dev = &pdev->dev; | |
| 122 | ||
| 123 | match = of_match_device(st_reset_of_match, dev); | |
| 124 | if (!match) | |
| 125 | return -ENODEV; | |
| 126 | ||
| 127 | st_restart_syscfg = (struct reset_syscfg *)match->data; | |
| 128 | ||
| 129 | st_restart_syscfg->regmap = | |
| 130 | syscon_regmap_lookup_by_phandle(np, "st,syscfg"); | |
| 131 | if (IS_ERR(st_restart_syscfg->regmap)) { | |
| 132 | dev_err(dev, "No syscfg phandle specified\n"); | |
| 133 | return PTR_ERR(st_restart_syscfg->regmap); | |
| 134 | } | |
| 135 | ||
| 453fe4f1 | 136 | return register_restart_handler(&st_restart_nb); |
| f0745f36 LJ |
137 | } |
| 138 | ||
| 139 | static struct platform_driver st_reset_driver = { | |
| 140 | .probe = st_reset_probe, | |
| 141 | .driver = { | |
| 142 | .name = "st_reset", | |
| 143 | .of_match_table = st_reset_of_match, | |
| 144 | }, | |
| 145 | }; | |
| 146 | ||
| 147 | static int __init st_reset_init(void) | |
| 148 | { | |
| 149 | return platform_driver_register(&st_reset_driver); | |
| 150 | } | |
| 151 | ||
| 152 | device_initcall(st_reset_init); | |
| 153 | ||
| 154 | MODULE_AUTHOR("Christophe Kerello <christophe.kerello@st.com>"); | |
| 155 | MODULE_DESCRIPTION("STMicroelectronics Power off Restart driver"); | |
| 156 | MODULE_LICENSE("GPL v2"); |