projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 0e545f57 LW |
1 | /* |
| 2 | * Copyright (C) 2014 Linaro Ltd. | |
| 3 | * | |
| 4 | * Author: Linus Walleij <linus.walleij@linaro.org> | |
| 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/init.h> | |
| 12 | #include <linux/mfd/syscon.h> | |
| 13 | #include <linux/reboot.h> | |
| 14 | #include <linux/regmap.h> | |
| 15 | #include <linux/of.h> | |
| 0e545f57 | 16 | |
| 0160817d LW |
17 | #define INTEGRATOR_HDR_CTRL_OFFSET 0x0C |
| 18 | #define INTEGRATOR_HDR_LOCK_OFFSET 0x14 | |
| 19 | #define INTEGRATOR_CM_CTRL_RESET (1 << 3) | |
| 20 | ||
| 0e545f57 | 21 | #define REALVIEW_SYS_LOCK_OFFSET 0x20 |
| 0e545f57 LW |
22 | #define REALVIEW_SYS_RESETCTL_OFFSET 0x40 |
| 23 | ||
| 0160817d LW |
24 | /* Magic unlocking token used on all Versatile boards */ |
| 25 | #define VERSATILE_LOCK_VAL 0xA05F | |
| 26 | ||
| 0e545f57 LW |
27 | /* |
| 28 | * We detect the different syscon types from the compatible strings. | |
| 29 | */ | |
| 30 | enum versatile_reboot { | |
| 0160817d | 31 | INTEGRATOR_REBOOT_CM, |
| 0e545f57 LW |
32 | REALVIEW_REBOOT_EB, |
| 33 | REALVIEW_REBOOT_PB1176, | |
| 34 | REALVIEW_REBOOT_PB11MP, | |
| 35 | REALVIEW_REBOOT_PBA8, | |
| 36 | REALVIEW_REBOOT_PBX, | |
| 37 | }; | |
| 38 | ||
| 39 | /* Pointer to the system controller */ | |
| 40 | static struct regmap *syscon_regmap; | |
| 41 | static enum versatile_reboot versatile_reboot_type; | |
| 42 | ||
| 43 | static const struct of_device_id versatile_reboot_of_match[] = { | |
| 0160817d LW |
44 | { |
| 45 | .compatible = "arm,core-module-integrator", | |
| 46 | .data = (void *)INTEGRATOR_REBOOT_CM | |
| 47 | }, | |
| 0e545f57 LW |
48 | { |
| 49 | .compatible = "arm,realview-eb-syscon", | |
| 50 | .data = (void *)REALVIEW_REBOOT_EB, | |
| 51 | }, | |
| 52 | { | |
| 53 | .compatible = "arm,realview-pb1176-syscon", | |
| 54 | .data = (void *)REALVIEW_REBOOT_PB1176, | |
| 55 | }, | |
| 56 | { | |
| 57 | .compatible = "arm,realview-pb11mp-syscon", | |
| 58 | .data = (void *)REALVIEW_REBOOT_PB11MP, | |
| 59 | }, | |
| 60 | { | |
| 61 | .compatible = "arm,realview-pba8-syscon", | |
| 62 | .data = (void *)REALVIEW_REBOOT_PBA8, | |
| 63 | }, | |
| 64 | { | |
| 65 | .compatible = "arm,realview-pbx-syscon", | |
| 66 | .data = (void *)REALVIEW_REBOOT_PBX, | |
| 67 | }, | |
| 0160817d | 68 | {}, |
| 0e545f57 LW |
69 | }; |
| 70 | ||
| 25a5b57d GR |
71 | static int versatile_reboot(struct notifier_block *this, unsigned long mode, |
| 72 | void *cmd) | |
| 0e545f57 LW |
73 | { |
| 74 | /* Unlock the reset register */ | |
| 0e545f57 LW |
75 | /* Then hit reset on the different machines */ |
| 76 | switch (versatile_reboot_type) { | |
| 0160817d LW |
77 | case INTEGRATOR_REBOOT_CM: |
| 78 | regmap_write(syscon_regmap, INTEGRATOR_HDR_LOCK_OFFSET, | |
| 79 | VERSATILE_LOCK_VAL); | |
| 80 | regmap_update_bits(syscon_regmap, | |
| 81 | INTEGRATOR_HDR_CTRL_OFFSET, | |
| 82 | INTEGRATOR_CM_CTRL_RESET, | |
| 83 | INTEGRATOR_CM_CTRL_RESET); | |
| 84 | break; | |
| 0e545f57 | 85 | case REALVIEW_REBOOT_EB: |
| 0160817d LW |
86 | regmap_write(syscon_regmap, REALVIEW_SYS_LOCK_OFFSET, |
| 87 | VERSATILE_LOCK_VAL); | |
| 0e545f57 LW |
88 | regmap_write(syscon_regmap, |
| 89 | REALVIEW_SYS_RESETCTL_OFFSET, 0x0008); | |
| 90 | break; | |
| 91 | case REALVIEW_REBOOT_PB1176: | |
| 0160817d LW |
92 | regmap_write(syscon_regmap, REALVIEW_SYS_LOCK_OFFSET, |
| 93 | VERSATILE_LOCK_VAL); | |
| 0e545f57 LW |
94 | regmap_write(syscon_regmap, |
| 95 | REALVIEW_SYS_RESETCTL_OFFSET, 0x0100); | |
| 96 | break; | |
| 97 | case REALVIEW_REBOOT_PB11MP: | |
| 98 | case REALVIEW_REBOOT_PBA8: | |
| 0160817d LW |
99 | regmap_write(syscon_regmap, REALVIEW_SYS_LOCK_OFFSET, |
| 100 | VERSATILE_LOCK_VAL); | |
| 0e545f57 LW |
101 | regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET, |
| 102 | 0x0000); | |
| 103 | regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET, | |
| 104 | 0x0004); | |
| 105 | break; | |
| 106 | case REALVIEW_REBOOT_PBX: | |
| 0160817d LW |
107 | regmap_write(syscon_regmap, REALVIEW_SYS_LOCK_OFFSET, |
| 108 | VERSATILE_LOCK_VAL); | |
| 0e545f57 LW |
109 | regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET, |
| 110 | 0x00f0); | |
| 111 | regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET, | |
| 112 | 0x00f4); | |
| 113 | break; | |
| 114 | } | |
| 115 | dsb(); | |
| 25a5b57d GR |
116 | |
| 117 | return NOTIFY_DONE; | |
| 0e545f57 LW |
118 | } |
| 119 | ||
| 25a5b57d GR |
120 | static struct notifier_block versatile_reboot_nb = { |
| 121 | .notifier_call = versatile_reboot, | |
| 122 | .priority = 192, | |
| 123 | }; | |
| 124 | ||
| 0e545f57 LW |
125 | static int __init versatile_reboot_probe(void) |
| 126 | { | |
| 127 | const struct of_device_id *reboot_id; | |
| 128 | struct device_node *np; | |
| 25a5b57d | 129 | int err; |
| 0e545f57 LW |
130 | |
| 131 | np = of_find_matching_node_and_match(NULL, versatile_reboot_of_match, | |
| 132 | &reboot_id); | |
| 133 | if (!np) | |
| 134 | return -ENODEV; | |
| 135 | versatile_reboot_type = (enum versatile_reboot)reboot_id->data; | |
| 136 | ||
| 137 | syscon_regmap = syscon_node_to_regmap(np); | |
| 138 | if (IS_ERR(syscon_regmap)) | |
| 139 | return PTR_ERR(syscon_regmap); | |
| 140 | ||
| 25a5b57d GR |
141 | err = register_restart_handler(&versatile_reboot_nb); |
| 142 | if (err) | |
| 143 | return err; | |
| 144 | ||
| 0e545f57 LW |
145 | pr_info("versatile reboot driver registered\n"); |
| 146 | return 0; | |
| 147 | } | |
| 148 | device_initcall(versatile_reboot_probe); |