projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| c06e836a JC |
1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify it | |
| 3 | * under the terms of the GNU General Public License version 2 as published | |
| 4 | * by the Free Software Foundation. | |
| 5 | * | |
| 6 | * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org> | |
| 7 | * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org> | |
| 8 | * Copyright (C) 2013 John Crispin <blogic@openwrt.org> | |
| 9 | */ | |
| 10 | ||
| 11 | #include <linux/pm.h> | |
| 12 | #include <linux/io.h> | |
| 2a153f1c JC |
13 | #include <linux/of.h> |
| 14 | #include <linux/reset-controller.h> | |
| c06e836a JC |
15 | |
| 16 | #include <asm/reboot.h> | |
| 17 | ||
| 18 | #include <asm/mach-ralink/ralink_regs.h> | |
| 19 | ||
| 20 | /* Reset Control */ | |
| 21 | #define SYSC_REG_RESET_CTRL 0x034 | |
| 22 | #define RSTCTL_RESET_SYSTEM BIT(0) | |
| 23 | ||
| 2a153f1c JC |
24 | static int ralink_assert_device(struct reset_controller_dev *rcdev, |
| 25 | unsigned long id) | |
| 26 | { | |
| 27 | u32 val; | |
| 28 | ||
| 29 | if (id < 8) | |
| 30 | return -1; | |
| 31 | ||
| 32 | val = rt_sysc_r32(SYSC_REG_RESET_CTRL); | |
| 33 | val |= BIT(id); | |
| 34 | rt_sysc_w32(val, SYSC_REG_RESET_CTRL); | |
| 35 | ||
| 36 | return 0; | |
| 37 | } | |
| 38 | ||
| 39 | static int ralink_deassert_device(struct reset_controller_dev *rcdev, | |
| 40 | unsigned long id) | |
| 41 | { | |
| 42 | u32 val; | |
| 43 | ||
| 44 | if (id < 8) | |
| 45 | return -1; | |
| 46 | ||
| 47 | val = rt_sysc_r32(SYSC_REG_RESET_CTRL); | |
| 48 | val &= ~BIT(id); | |
| 49 | rt_sysc_w32(val, SYSC_REG_RESET_CTRL); | |
| 50 | ||
| 51 | return 0; | |
| 52 | } | |
| 53 | ||
| 54 | static int ralink_reset_device(struct reset_controller_dev *rcdev, | |
| 55 | unsigned long id) | |
| 56 | { | |
| 57 | ralink_assert_device(rcdev, id); | |
| 58 | return ralink_deassert_device(rcdev, id); | |
| 59 | } | |
| 60 | ||
| 61 | static struct reset_control_ops reset_ops = { | |
| 62 | .reset = ralink_reset_device, | |
| 63 | .assert = ralink_assert_device, | |
| 64 | .deassert = ralink_deassert_device, | |
| 65 | }; | |
| 66 | ||
| 67 | static struct reset_controller_dev reset_dev = { | |
| 68 | .ops = &reset_ops, | |
| 69 | .owner = THIS_MODULE, | |
| 70 | .nr_resets = 32, | |
| 71 | .of_reset_n_cells = 1, | |
| 72 | }; | |
| 73 | ||
| 74 | void ralink_rst_init(void) | |
| 75 | { | |
| 76 | reset_dev.of_node = of_find_compatible_node(NULL, NULL, | |
| 77 | "ralink,rt2880-reset"); | |
| 78 | if (!reset_dev.of_node) | |
| 79 | pr_err("Failed to find reset controller node"); | |
| 80 | else | |
| 81 | reset_controller_register(&reset_dev); | |
| 82 | } | |
| 83 | ||
| c06e836a JC |
84 | static void ralink_restart(char *command) |
| 85 | { | |
| 86 | local_irq_disable(); | |
| 87 | rt_sysc_w32(RSTCTL_RESET_SYSTEM, SYSC_REG_RESET_CTRL); | |
| 88 | unreachable(); | |
| 89 | } | |
| 90 | ||
| 91 | static void ralink_halt(void) | |
| 92 | { | |
| 93 | local_irq_disable(); | |
| 94 | unreachable(); | |
| 95 | } | |
| 96 | ||
| 97 | static int __init mips_reboot_setup(void) | |
| 98 | { | |
| 99 | _machine_restart = ralink_restart; | |
| 100 | _machine_halt = ralink_halt; | |
| 101 | pm_power_off = ralink_halt; | |
| 102 | ||
| 103 | return 0; | |
| 104 | } | |
| 105 | ||
| 106 | arch_initcall(mips_reboot_setup); |