| /* |
| * Copyright (C) 2017, STMicroelectronics - All Rights Reserved |
| * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics. |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <common.h> |
| #include <dm.h> |
| #include <regmap.h> |
| #include <syscon.h> |
| #include <sysreset.h> |
| #include <asm/io.h> |
| |
| DECLARE_GLOBAL_DATA_PTR; |
| |
| struct sti_sysreset_priv { |
| phys_addr_t base; |
| }; |
| |
| static int sti_sysreset_request(struct udevice *dev, enum sysreset_t type) |
| { |
| struct sti_sysreset_priv *priv = dev_get_priv(dev); |
| |
| generic_clear_bit(0, (void __iomem *)priv->base); |
| |
| return -EINPROGRESS; |
| } |
| |
| static int sti_sysreset_probe(struct udevice *dev) |
| { |
| struct sti_sysreset_priv *priv = dev_get_priv(dev); |
| struct udevice *syscon; |
| struct regmap *regmap; |
| struct fdtdec_phandle_args syscfg_phandle; |
| int ret; |
| |
| /* get corresponding syscon phandle */ |
| ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev), |
| "st,syscfg", NULL, 0, 0, |
| &syscfg_phandle); |
| if (ret < 0) { |
| pr_err("Can't get syscfg phandle: %d\n", ret); |
| return ret; |
| } |
| |
| ret = uclass_get_device_by_of_offset(UCLASS_SYSCON, |
| syscfg_phandle.node, |
| &syscon); |
| if (ret) { |
| pr_err("%s: uclass_get_device_by_of_offset failed: %d\n", |
| __func__, ret); |
| return ret; |
| } |
| |
| regmap = syscon_get_regmap(syscon); |
| if (!regmap) { |
| pr_err("unable to get regmap for %s\n", syscon->name); |
| return -ENODEV; |
| } |
| |
| priv->base = regmap->base; |
| |
| return 0; |
| } |
| |
| static struct sysreset_ops sti_sysreset = { |
| .request = sti_sysreset_request, |
| }; |
| |
| static const struct udevice_id sti_sysreset_ids[] = { |
| { .compatible = "st,stih407-restart" }, |
| { } |
| }; |
| |
| U_BOOT_DRIVER(sysreset_sti) = { |
| .name = "sysreset_sti", |
| .id = UCLASS_SYSRESET, |
| .ops = &sti_sysreset, |
| .probe = sti_sysreset_probe, |
| .of_match = sti_sysreset_ids, |
| .priv_auto_alloc_size = sizeof(struct sti_sysreset_priv), |
| }; |