| Chia-Wei, Wang | 9fc2108 | 2020-12-14 13:54:26 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Copyright 2020 ASPEED Technology Inc. |
| 4 | */ |
| 5 | |
| 6 | #include <common.h> |
| 7 | #include <dm.h> |
| 8 | #include <log.h> |
| 9 | #include <misc.h> |
| 10 | #include <reset.h> |
| 11 | #include <reset-uclass.h> |
| 12 | #include <linux/err.h> |
| 13 | #include <asm/io.h> |
| 14 | #include <asm/arch/scu_ast2600.h> |
| 15 | |
| 16 | struct ast2600_reset_priv { |
| 17 | struct ast2600_scu *scu; |
| 18 | }; |
| 19 | |
| 20 | static int ast2600_reset_request(struct reset_ctl *reset_ctl) |
| 21 | { |
| 22 | debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl, |
| 23 | reset_ctl->dev, reset_ctl->id); |
| 24 | |
| 25 | return 0; |
| 26 | } |
| 27 | |
| 28 | static int ast2600_reset_free(struct reset_ctl *reset_ctl) |
| 29 | { |
| 30 | debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl, |
| 31 | reset_ctl->dev, reset_ctl->id); |
| 32 | |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | static int ast2600_reset_assert(struct reset_ctl *reset_ctl) |
| 37 | { |
| 38 | struct ast2600_reset_priv *priv = dev_get_priv(reset_ctl->dev); |
| 39 | struct ast2600_scu *scu = priv->scu; |
| 40 | |
| 41 | debug("%s: reset_ctl->id: %lu\n", __func__, reset_ctl->id); |
| 42 | |
| 43 | if (reset_ctl->id < 32) |
| 44 | writel(BIT(reset_ctl->id), scu->modrst_ctrl1); |
| 45 | else |
| 46 | writel(BIT(reset_ctl->id - 32), scu->modrst_ctrl2); |
| 47 | |
| 48 | return 0; |
| 49 | } |
| 50 | |
| 51 | static int ast2600_reset_deassert(struct reset_ctl *reset_ctl) |
| 52 | { |
| 53 | struct ast2600_reset_priv *priv = dev_get_priv(reset_ctl->dev); |
| 54 | struct ast2600_scu *scu = priv->scu; |
| 55 | |
| 56 | debug("%s: reset_ctl->id: %lu\n", __func__, reset_ctl->id); |
| 57 | |
| 58 | if (reset_ctl->id < 32) |
| 59 | writel(BIT(reset_ctl->id), scu->modrst_clr1); |
| 60 | else |
| 61 | writel(BIT(reset_ctl->id - 32), scu->modrst_clr2); |
| 62 | |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | static int ast2600_reset_probe(struct udevice *dev) |
| 67 | { |
| 68 | int rc; |
| 69 | struct ast2600_reset_priv *priv = dev_get_priv(dev); |
| 70 | struct udevice *scu_dev; |
| 71 | |
| 72 | /* get SCU base from clock device */ |
| 73 | rc = uclass_get_device_by_driver(UCLASS_CLK, |
| 74 | DM_DRIVER_GET(aspeed_ast2600_scu), &scu_dev); |
| 75 | if (rc) { |
| 76 | debug("%s: clock device not found, rc=%d\n", __func__, rc); |
| 77 | return rc; |
| 78 | } |
| 79 | |
| 80 | priv->scu = devfdt_get_addr_ptr(scu_dev); |
| 81 | if (IS_ERR_OR_NULL(priv->scu)) { |
| 82 | debug("%s: invalid SCU base pointer\n", __func__); |
| 83 | return PTR_ERR(priv->scu); |
| 84 | } |
| 85 | |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | static const struct udevice_id ast2600_reset_ids[] = { |
| 90 | { .compatible = "aspeed,ast2600-reset" }, |
| 91 | { } |
| 92 | }; |
| 93 | |
| 94 | struct reset_ops ast2600_reset_ops = { |
| 95 | .request = ast2600_reset_request, |
| 96 | .rfree = ast2600_reset_free, |
| 97 | .rst_assert = ast2600_reset_assert, |
| 98 | .rst_deassert = ast2600_reset_deassert, |
| 99 | }; |
| 100 | |
| 101 | U_BOOT_DRIVER(ast2600_reset) = { |
| 102 | .name = "ast2600_reset", |
| 103 | .id = UCLASS_RESET, |
| 104 | .of_match = ast2600_reset_ids, |
| 105 | .probe = ast2600_reset_probe, |
| 106 | .ops = &ast2600_reset_ops, |
| 107 | .priv_auto = sizeof(struct ast2600_reset_priv), |
| 108 | }; |