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"Das U-Boot" Source Tree
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 - https://www.ti.com/
6 * Andreas Dannenberg <dannenberg@ti.com>
7 */
8
9#include <dm.h>
10#include <errno.h>
11#include <log.h>
12#include <sysreset.h>
13#include <dm/device_compat.h>
14#include <linux/err.h>
15#include <linux/soc/ti/ti_sci_protocol.h>
16
17/**
18 * struct ti_sci_sysreset_data - sysreset controller information structure
19 * @sci: TI SCI handle used for communication with system controller
20 */
21struct ti_sci_sysreset_data {
22 const struct ti_sci_handle *sci;
23};
24
25static int ti_sci_sysreset_probe(struct udevice *dev)
26{
27 struct ti_sci_sysreset_data *data = dev_get_priv(dev);
28
29 debug("%s(dev=%p)\n", __func__, dev);
30
31 if (!data)
32 return -ENOMEM;
33
34 /* Store handle for communication with the system controller */
35 data->sci = ti_sci_get_handle(dev);
36 if (IS_ERR(data->sci))
37 return PTR_ERR(data->sci);
38
39 return 0;
40}
41
42static int ti_sci_sysreset_request(struct udevice *dev, enum sysreset_t type)
43{
44 struct ti_sci_sysreset_data *data = dev_get_priv(dev);
45 const struct ti_sci_handle *sci = data->sci;
46 const struct ti_sci_core_ops *cops = &sci->ops.core_ops;
47 int ret;
48
49 debug("%s(dev=%p, type=%d)\n", __func__, dev, type);
50
51 ret = cops->reboot_device(sci);
52 if (ret)
53 dev_err(dev, "%s: reboot_device failed (%d)\n", __func__, ret);
54
55 return ret;
56}
57
58static struct sysreset_ops ti_sci_sysreset_ops = {
59 .request = ti_sci_sysreset_request,
60};
61
62U_BOOT_DRIVER(ti_sci_sysreset) = {
63 .name = "ti-sci-sysreset",
64 .id = UCLASS_SYSRESET,
65 .probe = ti_sci_sysreset_probe,
66 .priv_auto = sizeof(struct ti_sci_sysreset_data),
67 .ops = &ti_sci_sysreset_ops,
68};