// SPDX-License-Identifier: GPL-2.0 /* * Copyright 2020 ASPEED Technology Inc. */ #include #include #include #include #include #include #include #include #include struct ast2600_reset_priv { struct ast2600_scu *scu; }; static int ast2600_reset_assert(struct reset_ctl *reset_ctl) { struct ast2600_reset_priv *priv = dev_get_priv(reset_ctl->dev); struct ast2600_scu *scu = priv->scu; debug("%s: reset_ctl->id: %lu\n", __func__, reset_ctl->id); if (reset_ctl->id < 32) writel(BIT(reset_ctl->id), &scu->modrst_ctrl1); else writel(BIT(reset_ctl->id - 32), &scu->modrst_ctrl2); return 0; } static int ast2600_reset_deassert(struct reset_ctl *reset_ctl) { struct ast2600_reset_priv *priv = dev_get_priv(reset_ctl->dev); struct ast2600_scu *scu = priv->scu; debug("%s: reset_ctl->id: %lu\n", __func__, reset_ctl->id); if (reset_ctl->id < 32) writel(BIT(reset_ctl->id), &scu->modrst_clr1); else writel(BIT(reset_ctl->id - 32), &scu->modrst_clr2); return 0; } static int ast2600_reset_status(struct reset_ctl *reset_ctl) { struct ast2600_reset_priv *priv = dev_get_priv(reset_ctl->dev); struct ast2600_scu *scu = priv->scu; int status; debug("%s: reset_ctl->id: %lu\n", __func__, reset_ctl->id); if (reset_ctl->id < 32) status = BIT(reset_ctl->id) & readl(&scu->modrst_ctrl1); else status = BIT(reset_ctl->id - 32) & readl(&scu->modrst_ctrl2); return !!status; } static int ast2600_reset_probe(struct udevice *dev) { int rc; struct ast2600_reset_priv *priv = dev_get_priv(dev); struct udevice *scu_dev; /* get SCU base from clock device */ rc = uclass_get_device_by_driver(UCLASS_CLK, DM_DRIVER_GET(aspeed_ast2600_scu), &scu_dev); if (rc) { debug("%s: clock device not found, rc=%d\n", __func__, rc); return rc; } priv->scu = devfdt_get_addr_ptr(scu_dev); if (IS_ERR_OR_NULL(priv->scu)) { debug("%s: invalid SCU base pointer\n", __func__); return PTR_ERR(priv->scu); } return 0; } static const struct udevice_id ast2600_reset_ids[] = { { .compatible = "aspeed,ast2600-reset" }, { } }; struct reset_ops ast2600_reset_ops = { .rst_assert = ast2600_reset_assert, .rst_deassert = ast2600_reset_deassert, .rst_status = ast2600_reset_status, }; U_BOOT_DRIVER(ast2600_reset) = { .name = "ast2600_reset", .id = UCLASS_RESET, .of_match = ast2600_reset_ids, .probe = ast2600_reset_probe, .ops = &ast2600_reset_ops, .priv_auto = sizeof(struct ast2600_reset_priv), };