Sergiu Moga | 65c723f | 2022-04-01 12:27:24 +0300 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Copyright (C) 2022 Microchip Technology, Inc. and its subsidiaries |
| 4 | */ |
| 5 | |
| 6 | #include <asm/arch/hardware.h> |
| 7 | #include <asm/io.h> |
| 8 | #include <asm/arch/at91_rstc.h> |
| 9 | #include <clk.h> |
| 10 | #include <common.h> |
| 11 | #include <cpu_func.h> |
| 12 | #include <dm.h> |
| 13 | #include <dm/device_compat.h> |
| 14 | #include <dm/device-internal.h> |
| 15 | #include <sysreset.h> |
| 16 | |
| 17 | static int at91_sysreset_request(struct udevice *dev, enum sysreset_t type) |
| 18 | { |
| 19 | at91_rstc_t *rstc = (at91_rstc_t *)dev_get_priv(dev); |
| 20 | |
| 21 | writel(AT91_RSTC_KEY |
| 22 | | AT91_RSTC_CR_PROCRST /* Processor Reset */ |
| 23 | | AT91_RSTC_CR_PERRST /* Peripheral Reset */ |
| 24 | #ifdef CONFIG_AT91RESET_EXTRST |
| 25 | | AT91_RSTC_CR_EXTRST /* External Reset (assert nRST pin) */ |
| 26 | #endif |
| 27 | , &rstc->cr); |
| 28 | |
| 29 | return -EINPROGRESS; |
| 30 | } |
| 31 | |
| 32 | static int at91_sysreset_probe(struct udevice *dev) |
| 33 | { |
| 34 | struct clk slck; |
| 35 | void *priv; |
| 36 | int ret; |
| 37 | |
| 38 | priv = dev_remap_addr(dev); |
| 39 | if (!priv) |
| 40 | return -EINVAL; |
| 41 | |
| 42 | dev_set_priv(dev, priv); |
| 43 | |
| 44 | ret = clk_get_by_index(dev, 0, &slck); |
| 45 | if (ret) |
| 46 | return ret; |
| 47 | |
| 48 | ret = clk_prepare_enable(&slck); |
| 49 | if (ret) |
| 50 | return ret; |
| 51 | |
| 52 | return 0; |
| 53 | } |
| 54 | |
| 55 | static struct sysreset_ops at91_sysreset = { |
| 56 | .request = at91_sysreset_request, |
| 57 | }; |
| 58 | |
Sergiu Moga | 65c723f | 2022-04-01 12:27:24 +0300 | [diff] [blame] | 59 | U_BOOT_DRIVER(sysreset_at91) = { |
| 60 | .id = UCLASS_SYSRESET, |
Sergiu Moga | bdcfc7d | 2023-01-04 16:03:18 +0200 | [diff] [blame] | 61 | .name = "at91_sysreset", |
Sergiu Moga | 65c723f | 2022-04-01 12:27:24 +0300 | [diff] [blame] | 62 | .ops = &at91_sysreset, |
| 63 | .probe = at91_sysreset_probe, |
Sergiu Moga | 65c723f | 2022-04-01 12:27:24 +0300 | [diff] [blame] | 64 | }; |