Tom Rini | 83d290c | 2018-05-06 17:58:06 -0400 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2016 Freescale Semiconductor, Inc. |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 4 | */ |
| 5 | |
| 6 | #include <common.h> |
Simon Glass | 9a3b4ce | 2019-12-28 10:45:01 -0700 | [diff] [blame] | 7 | #include <cpu_func.h> |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 8 | #include <asm/io.h> |
| 9 | #include <asm/arch/imx-regs.h> |
| 10 | |
| 11 | /* |
| 12 | * MX7ULP WDOG Register Map |
| 13 | */ |
| 14 | struct wdog_regs { |
Breno Lima | edf95bd | 2021-06-29 10:32:35 +0800 | [diff] [blame] | 15 | u32 cs; |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 16 | u32 cnt; |
| 17 | u32 toval; |
| 18 | u32 win; |
| 19 | }; |
| 20 | |
| 21 | #ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS |
| 22 | #define CONFIG_WATCHDOG_TIMEOUT_MSECS 0x1500 |
| 23 | #endif |
| 24 | |
| 25 | #define REFRESH_WORD0 0xA602 /* 1st refresh word */ |
| 26 | #define REFRESH_WORD1 0xB480 /* 2nd refresh word */ |
| 27 | |
| 28 | #define UNLOCK_WORD0 0xC520 /* 1st unlock word */ |
| 29 | #define UNLOCK_WORD1 0xD928 /* 2nd unlock word */ |
| 30 | |
Ye Li | a79f200 | 2022-10-21 16:41:15 +0800 | [diff] [blame] | 31 | #define UNLOCK_WORD 0xD928C520 /* unlock word */ |
| 32 | #define REFRESH_WORD 0xB480A602 /* refresh word */ |
| 33 | |
Breno Lima | edf95bd | 2021-06-29 10:32:35 +0800 | [diff] [blame] | 34 | #define WDGCS_WDGE BIT(7) |
| 35 | #define WDGCS_WDGUPDATE BIT(5) |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 36 | |
Breno Lima | edf95bd | 2021-06-29 10:32:35 +0800 | [diff] [blame] | 37 | #define WDGCS_RCS BIT(10) |
| 38 | #define WDGCS_ULK BIT(11) |
Alice Guo | ef0ad9b | 2022-10-21 16:41:16 +0800 | [diff] [blame] | 39 | #define WDOG_CS_PRES BIT(12) |
Ye Li | a79f200 | 2022-10-21 16:41:15 +0800 | [diff] [blame] | 40 | #define WDGCS_CMD32EN BIT(13) |
Breno Lima | edf95bd | 2021-06-29 10:32:35 +0800 | [diff] [blame] | 41 | #define WDGCS_FLG BIT(14) |
Alice Guo | a7fd633 | 2022-10-21 16:41:17 +0800 | [diff] [blame^] | 42 | #define WDGCS_INT BIT(6) |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 43 | |
| 44 | #define WDG_BUS_CLK (0x0) |
| 45 | #define WDG_LPO_CLK (0x1) |
| 46 | #define WDG_32KHZ_CLK (0x2) |
| 47 | #define WDG_EXT_CLK (0x3) |
| 48 | |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 49 | void hw_watchdog_set_timeout(u16 val) |
| 50 | { |
| 51 | /* setting timeout value */ |
| 52 | struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE_ADDR; |
| 53 | |
| 54 | writel(val, &wdog->toval); |
| 55 | } |
| 56 | |
| 57 | void hw_watchdog_reset(void) |
| 58 | { |
| 59 | struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE_ADDR; |
| 60 | |
Ye Li | a79f200 | 2022-10-21 16:41:15 +0800 | [diff] [blame] | 61 | if (readl(&wdog->cs) & WDGCS_CMD32EN) { |
| 62 | writel(REFRESH_WORD, &wdog->cnt); |
| 63 | } else { |
| 64 | dmb(); |
| 65 | __raw_writel(REFRESH_WORD0, &wdog->cnt); |
| 66 | __raw_writel(REFRESH_WORD1, &wdog->cnt); |
| 67 | dmb(); |
| 68 | } |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 69 | } |
| 70 | |
| 71 | void hw_watchdog_init(void) |
| 72 | { |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 73 | struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE_ADDR; |
Ye Li | a79f200 | 2022-10-21 16:41:15 +0800 | [diff] [blame] | 74 | u32 cmd32 = 0; |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 75 | |
Ye Li | a79f200 | 2022-10-21 16:41:15 +0800 | [diff] [blame] | 76 | if (readl(&wdog->cs) & WDGCS_CMD32EN) { |
| 77 | writel(UNLOCK_WORD, &wdog->cnt); |
| 78 | cmd32 = WDGCS_CMD32EN; |
| 79 | } else { |
| 80 | dmb(); |
| 81 | __raw_writel(UNLOCK_WORD0, &wdog->cnt); |
| 82 | __raw_writel(UNLOCK_WORD1, &wdog->cnt); |
| 83 | dmb(); |
| 84 | } |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 85 | |
Breno Lima | edf95bd | 2021-06-29 10:32:35 +0800 | [diff] [blame] | 86 | /* Wait WDOG Unlock */ |
| 87 | while (!(readl(&wdog->cs) & WDGCS_ULK)) |
| 88 | ; |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 89 | |
| 90 | hw_watchdog_set_timeout(CONFIG_WATCHDOG_TIMEOUT_MSECS); |
| 91 | writel(0, &wdog->win); |
| 92 | |
Breno Lima | edf95bd | 2021-06-29 10:32:35 +0800 | [diff] [blame] | 93 | /* setting 1-kHz clock source, enable counter running, and clear interrupt */ |
Alice Guo | ef0ad9b | 2022-10-21 16:41:16 +0800 | [diff] [blame] | 94 | if (IS_ENABLED(CONFIG_ARCH_IMX9)) |
| 95 | writel((cmd32 | WDGCS_WDGE | WDGCS_WDGUPDATE | (WDG_LPO_CLK << 8) | |
Alice Guo | a7fd633 | 2022-10-21 16:41:17 +0800 | [diff] [blame^] | 96 | WDGCS_FLG | WDOG_CS_PRES | WDGCS_INT), &wdog->cs); |
Alice Guo | ef0ad9b | 2022-10-21 16:41:16 +0800 | [diff] [blame] | 97 | else |
| 98 | writel((cmd32 | WDGCS_WDGE | WDGCS_WDGUPDATE | (WDG_LPO_CLK << 8) | |
| 99 | WDGCS_FLG), &wdog->cs); |
Breno Lima | edf95bd | 2021-06-29 10:32:35 +0800 | [diff] [blame] | 100 | |
| 101 | /* Wait WDOG reconfiguration */ |
| 102 | while (!(readl(&wdog->cs) & WDGCS_RCS)) |
| 103 | ; |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 104 | |
| 105 | hw_watchdog_reset(); |
| 106 | } |
| 107 | |
Harald Seiler | 35b65dd | 2020-12-15 16:47:52 +0100 | [diff] [blame] | 108 | void reset_cpu(void) |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 109 | { |
| 110 | struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE_ADDR; |
Ye Li | a79f200 | 2022-10-21 16:41:15 +0800 | [diff] [blame] | 111 | u32 cmd32 = 0; |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 112 | |
Ye Li | a79f200 | 2022-10-21 16:41:15 +0800 | [diff] [blame] | 113 | if (readl(&wdog->cs) & WDGCS_CMD32EN) { |
| 114 | writel(UNLOCK_WORD, &wdog->cnt); |
| 115 | cmd32 = WDGCS_CMD32EN; |
| 116 | } else { |
| 117 | dmb(); |
| 118 | __raw_writel(UNLOCK_WORD0, &wdog->cnt); |
| 119 | __raw_writel(UNLOCK_WORD1, &wdog->cnt); |
| 120 | dmb(); |
| 121 | } |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 122 | |
Breno Lima | edf95bd | 2021-06-29 10:32:35 +0800 | [diff] [blame] | 123 | /* Wait WDOG Unlock */ |
| 124 | while (!(readl(&wdog->cs) & WDGCS_ULK)) |
| 125 | ; |
| 126 | |
Alice Guo | ef0ad9b | 2022-10-21 16:41:16 +0800 | [diff] [blame] | 127 | hw_watchdog_set_timeout(5); /* 5ms timeout for general; 40ms timeout for imx93 */ |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 128 | writel(0, &wdog->win); |
| 129 | |
Breno Lima | edf95bd | 2021-06-29 10:32:35 +0800 | [diff] [blame] | 130 | /* enable counter running */ |
Alice Guo | ef0ad9b | 2022-10-21 16:41:16 +0800 | [diff] [blame] | 131 | if (IS_ENABLED(CONFIG_ARCH_IMX9)) |
Alice Guo | a7fd633 | 2022-10-21 16:41:17 +0800 | [diff] [blame^] | 132 | writel((cmd32 | WDGCS_WDGE | (WDG_LPO_CLK << 8) | WDOG_CS_PRES | |
| 133 | WDGCS_INT), &wdog->cs); |
Alice Guo | ef0ad9b | 2022-10-21 16:41:16 +0800 | [diff] [blame] | 134 | else |
| 135 | writel((cmd32 | WDGCS_WDGE | (WDG_LPO_CLK << 8)), &wdog->cs); |
Breno Lima | edf95bd | 2021-06-29 10:32:35 +0800 | [diff] [blame] | 136 | |
| 137 | /* Wait WDOG reconfiguration */ |
| 138 | while (!(readl(&wdog->cs) & WDGCS_RCS)) |
| 139 | ; |
Ye Li | 253531b | 2017-02-22 16:21:48 +0800 | [diff] [blame] | 140 | |
| 141 | hw_watchdog_reset(); |
| 142 | |
| 143 | while (1); |
| 144 | } |