| Stefan Roese | 8870e45 | 2013-04-09 21:06:08 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2013 Stefan Roese <sr@denx.de> |
| 3 | * |
| Wolfgang Denk | 1a45966 | 2013-07-08 09:37:19 +0200 | [diff] [blame] | 4 | * SPDX-License-Identifier: GPL-2.0+ |
| Stefan Roese | 8870e45 | 2013-04-09 21:06:08 +0000 | [diff] [blame] | 5 | */ |
| 6 | |
| 7 | #include <common.h> |
| Jeroen Hofstee | 5624c6b | 2014-10-08 22:57:52 +0200 | [diff] [blame] | 8 | #include <asm/arch/sys_proto.h> |
| Masahiro Yamada | 1221ce4 | 2016-09-21 11:28:55 +0900 | [diff] [blame] | 9 | #include <linux/errno.h> |
| Stefan Roese | 8870e45 | 2013-04-09 21:06:08 +0000 | [diff] [blame] | 10 | #include <asm/io.h> |
| Stefano Babic | 552a848 | 2017-06-29 10:16:06 +0200 | [diff] [blame] | 11 | #include <asm/mach-imx/regs-common.h> |
| Stefan Roese | 8870e45 | 2013-04-09 21:06:08 +0000 | [diff] [blame] | 12 | |
| 13 | /* 1 second delay should be plenty of time for block reset. */ |
| 14 | #define RESET_MAX_TIMEOUT 1000000 |
| 15 | |
| 16 | #define MXS_BLOCK_SFTRST (1 << 31) |
| 17 | #define MXS_BLOCK_CLKGATE (1 << 30) |
| 18 | |
| 19 | int mxs_wait_mask_set(struct mxs_register_32 *reg, uint32_t mask, unsigned |
| 20 | int timeout) |
| 21 | { |
| 22 | while (--timeout) { |
| 23 | if ((readl(®->reg) & mask) == mask) |
| 24 | break; |
| 25 | udelay(1); |
| 26 | } |
| 27 | |
| 28 | return !timeout; |
| 29 | } |
| 30 | |
| 31 | int mxs_wait_mask_clr(struct mxs_register_32 *reg, uint32_t mask, unsigned |
| 32 | int timeout) |
| 33 | { |
| 34 | while (--timeout) { |
| 35 | if ((readl(®->reg) & mask) == 0) |
| 36 | break; |
| 37 | udelay(1); |
| 38 | } |
| 39 | |
| 40 | return !timeout; |
| 41 | } |
| 42 | |
| 43 | int mxs_reset_block(struct mxs_register_32 *reg) |
| 44 | { |
| 45 | /* Clear SFTRST */ |
| 46 | writel(MXS_BLOCK_SFTRST, ®->reg_clr); |
| 47 | |
| 48 | if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT)) |
| 49 | return 1; |
| 50 | |
| 51 | /* Clear CLKGATE */ |
| 52 | writel(MXS_BLOCK_CLKGATE, ®->reg_clr); |
| 53 | |
| 54 | /* Set SFTRST */ |
| 55 | writel(MXS_BLOCK_SFTRST, ®->reg_set); |
| 56 | |
| 57 | /* Wait for CLKGATE being set */ |
| 58 | if (mxs_wait_mask_set(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT)) |
| 59 | return 1; |
| 60 | |
| 61 | /* Clear SFTRST */ |
| 62 | writel(MXS_BLOCK_SFTRST, ®->reg_clr); |
| 63 | |
| 64 | if (mxs_wait_mask_clr(reg, MXS_BLOCK_SFTRST, RESET_MAX_TIMEOUT)) |
| 65 | return 1; |
| 66 | |
| 67 | /* Clear CLKGATE */ |
| 68 | writel(MXS_BLOCK_CLKGATE, ®->reg_clr); |
| 69 | |
| 70 | if (mxs_wait_mask_clr(reg, MXS_BLOCK_CLKGATE, RESET_MAX_TIMEOUT)) |
| 71 | return 1; |
| 72 | |
| 73 | return 0; |
| 74 | } |