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 <sysreset.h> 13 #include <linux/soc/ti/ti_sci_protocol.h> 14 15 /** 16 * struct ti_sci_sysreset_data - sysreset controller information structure 17 * @sci: TI SCI handle used for communication with system controller 18 */ 19 struct ti_sci_sysreset_data { 20 const struct ti_sci_handle *sci; 21 }; 22 23 static int ti_sci_sysreset_probe(struct udevice *dev) 24 { 25 struct ti_sci_sysreset_data *data = dev_get_priv(dev); 26 27 debug("%s(dev=%p)\n", __func__, dev); 28 29 if (!data) 30 return -ENOMEM; 31 32 /* Store handle for communication with the system controller */ 33 data->sci = ti_sci_get_handle(dev); 34 if (IS_ERR(data->sci)) 35 return PTR_ERR(data->sci); 36 37 return 0; 38 } 39 40 static int ti_sci_sysreset_request(struct udevice *dev, enum sysreset_t type) 41 { 42 struct ti_sci_sysreset_data *data = dev_get_priv(dev); 43 const struct ti_sci_handle *sci = data->sci; 44 const struct ti_sci_core_ops *cops = &sci->ops.core_ops; 45 int ret; 46 47 debug("%s(dev=%p, type=%d)\n", __func__, dev, type); 48 49 ret = cops->reboot_device(sci); 50 if (ret) 51 dev_err(rst->dev, "%s: reboot_device failed (%d)\n", 52 __func__, ret); 53 54 return ret; 55 } 56 57 static struct sysreset_ops ti_sci_sysreset_ops = { 58 .request = ti_sci_sysreset_request, 59 }; 60 61 static const struct udevice_id ti_sci_sysreset_of_match[] = { 62 { .compatible = "ti,sci-sysreset", }, 63 { /* sentinel */ }, 64 }; 65 66 U_BOOT_DRIVER(ti_sci_sysreset) = { 67 .name = "ti-sci-sysreset", 68 .id = UCLASS_SYSRESET, 69 .of_match = ti_sci_sysreset_of_match, 70 .probe = ti_sci_sysreset_probe, 71 .priv_auto_alloc_size = sizeof(struct ti_sci_sysreset_data), 72 .ops = &ti_sci_sysreset_ops, 73 }; 74