LXR uboot/drivers/sysreset/sysreset-ti-sci.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Texas Instruments System Control Interface (TI SCI) system reset driver
   4 *
   5 * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
   6 *      Andreas Dannenberg <dannenberg@ti.com>
   7 */
   8
   9#include <common.h>
  10#include <dm.h>
  11#include <errno.h>
  12#include <log.h>
  13#include <sysreset.h>
  14#include <dm/device_compat.h>
  15#include <linux/err.h>
  16#include <linux/soc/ti/ti_sci_protocol.h>
  17
  18/**
  19 * struct ti_sci_sysreset_data - sysreset controller information structure
  20 * @sci: TI SCI handle used for communication with system controller
  21 */
  22struct ti_sci_sysreset_data {
  23        const struct ti_sci_handle *sci;
  24};
  25
  26static int ti_sci_sysreset_probe(struct udevice *dev)
  27{
  28        struct ti_sci_sysreset_data *data = dev_get_priv(dev);
  29
  30        debug("%s(dev=%p)\n", __func__, dev);
  31
  32        if (!data)
  33                return -ENOMEM;
  34
  35        /* Store handle for communication with the system controller */
  36        data->sci = ti_sci_get_handle(dev);
  37        if (IS_ERR(data->sci))
  38                return PTR_ERR(data->sci);
  39
  40        return 0;
  41}
  42
  43static int ti_sci_sysreset_request(struct udevice *dev, enum sysreset_t type)
  44{
  45        struct ti_sci_sysreset_data *data = dev_get_priv(dev);
  46        const struct ti_sci_handle *sci = data->sci;
  47        const struct ti_sci_core_ops *cops = &sci->ops.core_ops;
  48        int ret;
  49
  50        debug("%s(dev=%p, type=%d)\n", __func__, dev, type);
  51
  52        ret = cops->reboot_device(sci);
  53        if (ret)
  54                dev_err(rst->dev, "%s: reboot_device failed (%d)\n",
  55                        __func__, ret);
  56
  57        return ret;
  58}
  59
  60static struct sysreset_ops ti_sci_sysreset_ops = {
  61        .request = ti_sci_sysreset_request,
  62};
  63
  64static const struct udevice_id ti_sci_sysreset_of_match[] = {
  65        { .compatible = "ti,sci-sysreset", },
  66        { /* sentinel */ },
  67};
  68
  69U_BOOT_DRIVER(ti_sci_sysreset) = {
  70        .name = "ti-sci-sysreset",
  71        .id = UCLASS_SYSRESET,
  72        .of_match = ti_sci_sysreset_of_match,
  73        .probe = ti_sci_sysreset_probe,
  74        .priv_auto_alloc_size = sizeof(struct ti_sci_sysreset_data),
  75        .ops = &ti_sci_sysreset_ops,
  76};
  77