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 */
21 struct ti_sci_sysreset_data {
22 const struct ti_sci_handle *sci;
23 };
24
ti_sci_sysreset_probe(struct udevice * dev)25 static 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
ti_sci_sysreset_request(struct udevice * dev,enum sysreset_t type)42 static 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
58 static struct sysreset_ops ti_sci_sysreset_ops = {
59 .request = ti_sci_sysreset_request,
60 };
61
62 U_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 };
69