LXR uboot/drivers/reset/sandbox-reset.c

   1/*
   2 * Copyright (c) 2016, NVIDIA CORPORATION.
   3 *
   4 * SPDX-License-Identifier: GPL-2.0
   5 */
   6
   7#include <common.h>
   8#include <dm.h>
   9#include <reset-uclass.h>
  10#include <asm/io.h>
  11#include <asm/reset.h>
  12
  13#define SANDBOX_RESET_SIGNALS 3
  14
  15struct sandbox_reset_signal {
  16        bool asserted;
  17};
  18
  19struct sandbox_reset {
  20        struct sandbox_reset_signal signals[SANDBOX_RESET_SIGNALS];
  21};
  22
  23static int sandbox_reset_request(struct reset_ctl *reset_ctl)
  24{
  25        debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  26
  27        if (reset_ctl->id >= SANDBOX_RESET_SIGNALS)
  28                return -EINVAL;
  29
  30        return 0;
  31}
  32
  33static int sandbox_reset_free(struct reset_ctl *reset_ctl)
  34{
  35        debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  36
  37        return 0;
  38}
  39
  40static int sandbox_reset_assert(struct reset_ctl *reset_ctl)
  41{
  42        struct sandbox_reset *sbr = dev_get_priv(reset_ctl->dev);
  43
  44        debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  45
  46        sbr->signals[reset_ctl->id].asserted = true;
  47
  48        return 0;
  49}
  50
  51static int sandbox_reset_deassert(struct reset_ctl *reset_ctl)
  52{
  53        struct sandbox_reset *sbr = dev_get_priv(reset_ctl->dev);
  54
  55        debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
  56
  57        sbr->signals[reset_ctl->id].asserted = false;
  58
  59        return 0;
  60}
  61
  62static int sandbox_reset_bind(struct udevice *dev)
  63{
  64        debug("%s(dev=%p)\n", __func__, dev);
  65
  66        return 0;
  67}
  68
  69static int sandbox_reset_probe(struct udevice *dev)
  70{
  71        debug("%s(dev=%p)\n", __func__, dev);
  72
  73        return 0;
  74}
  75
  76static const struct udevice_id sandbox_reset_ids[] = {
  77        { .compatible = "sandbox,reset-ctl" },
  78        { }
  79};
  80
  81struct reset_ops sandbox_reset_reset_ops = {
  82        .request = sandbox_reset_request,
  83        .free = sandbox_reset_free,
  84        .rst_assert = sandbox_reset_assert,
  85        .rst_deassert = sandbox_reset_deassert,
  86};
  87
  88U_BOOT_DRIVER(sandbox_reset) = {
  89        .name = "sandbox_reset",
  90        .id = UCLASS_RESET,
  91        .of_match = sandbox_reset_ids,
  92        .bind = sandbox_reset_bind,
  93        .probe = sandbox_reset_probe,
  94        .priv_auto_alloc_size = sizeof(struct sandbox_reset),
  95        .ops = &sandbox_reset_reset_ops,
  96};
  97
  98int sandbox_reset_query(struct udevice *dev, unsigned long id)
  99{
 100        struct sandbox_reset *sbr = dev_get_priv(dev);
 101
 102        debug("%s(dev=%p, id=%ld)\n", __func__, dev, id);
 103
 104        if (id >= SANDBOX_RESET_SIGNALS)
 105                return -EINVAL;
 106
 107        return sbr->signals[id].asserted;
 108}
 109