git.sur5r.net Git - u-boot/blob - drivers/sysreset/sysreset_sti.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
   4  * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <regmap.h>
  10 #include <syscon.h>
  11 #include <sysreset.h>
  12 #include <asm/io.h>
  13
  14 DECLARE_GLOBAL_DATA_PTR;
  15
  16 struct sti_sysreset_priv {
  17         phys_addr_t base;
  18 };
  19
  20 static int sti_sysreset_request(struct udevice *dev, enum sysreset_t type)
  21 {
  22         struct sti_sysreset_priv *priv = dev_get_priv(dev);
  23
  24         generic_clear_bit(0, (void __iomem *)priv->base);
  25
  26         return -EINPROGRESS;
  27 }
  28
  29 static int sti_sysreset_probe(struct udevice *dev)
  30 {
  31         struct sti_sysreset_priv *priv = dev_get_priv(dev);
  32         struct udevice *syscon;
  33         struct regmap *regmap;
  34         struct fdtdec_phandle_args syscfg_phandle;
  35         int ret;
  36
  37         /* get corresponding syscon phandle */
  38         ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
  39                                              "st,syscfg", NULL, 0, 0,
  40                                              &syscfg_phandle);
  41         if (ret < 0) {
  42                 pr_err("Can't get syscfg phandle: %d\n", ret);
  43                 return ret;
  44         }
  45
  46         ret = uclass_get_device_by_of_offset(UCLASS_SYSCON,
  47                                              syscfg_phandle.node,
  48                                              &syscon);
  49         if (ret) {
  50                 pr_err("%s: uclass_get_device_by_of_offset failed: %d\n",
  51                       __func__, ret);
  52                 return ret;
  53         }
  54
  55         regmap = syscon_get_regmap(syscon);
  56         if (!regmap) {
  57                 pr_err("unable to get regmap for %s\n", syscon->name);
  58                 return -ENODEV;
  59         }
  60
  61         priv->base = regmap->ranges[0].start;
  62
  63         return 0;
  64 }
  65
  66 static struct sysreset_ops sti_sysreset = {
  67         .request        = sti_sysreset_request,
  68 };
  69
  70 static const struct udevice_id sti_sysreset_ids[] = {
  71         { .compatible = "st,stih407-restart" },
  72         { }
  73 };
  74
  75 U_BOOT_DRIVER(sysreset_sti) = {
  76         .name = "sysreset_sti",
  77         .id = UCLASS_SYSRESET,
  78         .ops = &sti_sysreset,
  79         .probe = sti_sysreset_probe,
  80         .of_match = sti_sysreset_ids,
  81         .priv_auto_alloc_size = sizeof(struct sti_sysreset_priv),
  82 };