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 */
22 struct ti_sci_sysreset_data {
23 const struct ti_sci_handle *sci;
24 };
25
ti_sci_sysreset_probe(struct udevice * dev)26 static 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
ti_sci_sysreset_request(struct udevice * dev,enum sysreset_t type)43 static 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(dev, "%s: reboot_device failed (%d)\n", __func__, ret);
55
56 return ret;
57 }
58
59 static struct sysreset_ops ti_sci_sysreset_ops = {
60 .request = ti_sci_sysreset_request,
61 };
62
63 static const struct udevice_id ti_sci_sysreset_of_match[] = {
64 { .compatible = "ti,sci-sysreset", },
65 { /* sentinel */ },
66 };
67
68 U_BOOT_DRIVER(ti_sci_sysreset) = {
69 .name = "ti-sci-sysreset",
70 .id = UCLASS_SYSRESET,
71 .of_match = ti_sci_sysreset_of_match,
72 .probe = ti_sci_sysreset_probe,
73 .priv_auto = sizeof(struct ti_sci_sysreset_data),
74 .ops = &ti_sci_sysreset_ops,
75 };
76