LXR uboot/drivers/sysreset/sysreset-uclass.c

   1/*
   2 * Copyright (C) 2015 Google, Inc
   3 * Written by Simon Glass <sjg@chromium.org>
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7
   8#include <common.h>
   9#include <sysreset.h>
  10#include <dm.h>
  11#include <errno.h>
  12#include <regmap.h>
  13#include <dm/device-internal.h>
  14#include <dm/lists.h>
  15#include <dm/root.h>
  16#include <linux/err.h>
  17
  18int sysreset_request(struct udevice *dev, enum sysreset_t type)
  19{
  20        struct sysreset_ops *ops = sysreset_get_ops(dev);
  21
  22        if (!ops->request)
  23                return -ENOSYS;
  24
  25        return ops->request(dev, type);
  26}
  27
  28int sysreset_walk(enum sysreset_t type)
  29{
  30        struct udevice *dev;
  31        int ret = -ENOSYS;
  32
  33        while (ret != -EINPROGRESS && type < SYSRESET_COUNT) {
  34                for (uclass_first_device(UCLASS_SYSRESET, &dev);
  35                     dev;
  36                     uclass_next_device(&dev)) {
  37                        ret = sysreset_request(dev, type);
  38                        if (ret == -EINPROGRESS)
  39                                break;
  40                }
  41                type++;
  42        }
  43
  44        return ret;
  45}
  46
  47void sysreset_walk_halt(enum sysreset_t type)
  48{
  49        int ret;
  50
  51        ret = sysreset_walk(type);
  52
  53        /* Wait for the reset to take effect */
  54        if (ret == -EINPROGRESS)
  55                mdelay(100);
  56
  57        /* Still no reset? Give up */
  58        debug("System reset not supported on this platform\n");
  59        hang();
  60}
  61
  62/**
  63 * reset_cpu() - calls sysreset_walk(SYSRESET_WARM)
  64 */
  65void reset_cpu(ulong addr)
  66{
  67        sysreset_walk_halt(SYSRESET_WARM);
  68}
  69
  70
  71int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  72{
  73        sysreset_walk_halt(SYSRESET_WARM);
  74
  75        return 0;
  76}
  77
  78UCLASS_DRIVER(sysreset) = {
  79        .id             = UCLASS_SYSRESET,
  80        .name           = "sysreset",
  81};
  82