| Linus Walleij | 0e545f5 | 2014-05-22 10:20:38 +0200 | [diff] [blame] | 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> |
| 16 | #include <asm/system_misc.h> |
| 17 | |
| 18 | #define REALVIEW_SYS_LOCK_OFFSET 0x20 |
| 19 | #define REALVIEW_SYS_LOCK_VAL 0xA05F |
| 20 | #define REALVIEW_SYS_RESETCTL_OFFSET 0x40 |
| 21 | |
| 22 | /* |
| 23 | * We detect the different syscon types from the compatible strings. |
| 24 | */ |
| 25 | enum versatile_reboot { |
| 26 | REALVIEW_REBOOT_EB, |
| 27 | REALVIEW_REBOOT_PB1176, |
| 28 | REALVIEW_REBOOT_PB11MP, |
| 29 | REALVIEW_REBOOT_PBA8, |
| 30 | REALVIEW_REBOOT_PBX, |
| 31 | }; |
| 32 | |
| 33 | /* Pointer to the system controller */ |
| 34 | static struct regmap *syscon_regmap; |
| 35 | static enum versatile_reboot versatile_reboot_type; |
| 36 | |
| 37 | static const struct of_device_id versatile_reboot_of_match[] = { |
| 38 | { |
| 39 | .compatible = "arm,realview-eb-syscon", |
| 40 | .data = (void *)REALVIEW_REBOOT_EB, |
| 41 | }, |
| 42 | { |
| 43 | .compatible = "arm,realview-pb1176-syscon", |
| 44 | .data = (void *)REALVIEW_REBOOT_PB1176, |
| 45 | }, |
| 46 | { |
| 47 | .compatible = "arm,realview-pb11mp-syscon", |
| 48 | .data = (void *)REALVIEW_REBOOT_PB11MP, |
| 49 | }, |
| 50 | { |
| 51 | .compatible = "arm,realview-pba8-syscon", |
| 52 | .data = (void *)REALVIEW_REBOOT_PBA8, |
| 53 | }, |
| 54 | { |
| 55 | .compatible = "arm,realview-pbx-syscon", |
| 56 | .data = (void *)REALVIEW_REBOOT_PBX, |
| 57 | }, |
| 58 | }; |
| 59 | |
| 60 | static void versatile_reboot(enum reboot_mode mode, const char *cmd) |
| 61 | { |
| 62 | /* Unlock the reset register */ |
| 63 | regmap_write(syscon_regmap, REALVIEW_SYS_LOCK_OFFSET, |
| 64 | REALVIEW_SYS_LOCK_VAL); |
| 65 | /* Then hit reset on the different machines */ |
| 66 | switch (versatile_reboot_type) { |
| 67 | case REALVIEW_REBOOT_EB: |
| 68 | regmap_write(syscon_regmap, |
| 69 | REALVIEW_SYS_RESETCTL_OFFSET, 0x0008); |
| 70 | break; |
| 71 | case REALVIEW_REBOOT_PB1176: |
| 72 | regmap_write(syscon_regmap, |
| 73 | REALVIEW_SYS_RESETCTL_OFFSET, 0x0100); |
| 74 | break; |
| 75 | case REALVIEW_REBOOT_PB11MP: |
| 76 | case REALVIEW_REBOOT_PBA8: |
| 77 | regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET, |
| 78 | 0x0000); |
| 79 | regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET, |
| 80 | 0x0004); |
| 81 | break; |
| 82 | case REALVIEW_REBOOT_PBX: |
| 83 | regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET, |
| 84 | 0x00f0); |
| 85 | regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET, |
| 86 | 0x00f4); |
| 87 | break; |
| 88 | } |
| 89 | dsb(); |
| 90 | } |
| 91 | |
| 92 | static int __init versatile_reboot_probe(void) |
| 93 | { |
| 94 | const struct of_device_id *reboot_id; |
| 95 | struct device_node *np; |
| 96 | |
| 97 | np = of_find_matching_node_and_match(NULL, versatile_reboot_of_match, |
| 98 | &reboot_id); |
| 99 | if (!np) |
| 100 | return -ENODEV; |
| 101 | versatile_reboot_type = (enum versatile_reboot)reboot_id->data; |
| 102 | |
| 103 | syscon_regmap = syscon_node_to_regmap(np); |
| 104 | if (IS_ERR(syscon_regmap)) |
| 105 | return PTR_ERR(syscon_regmap); |
| 106 | |
| 107 | arm_pm_restart = versatile_reboot; |
| 108 | pr_info("versatile reboot driver registered\n"); |
| 109 | return 0; |
| 110 | } |
| 111 | device_initcall(versatile_reboot_probe); |