1 // SPDX-License-Identifier: GPL-2.0+
5  * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
8  * Loosely based on Linux kernel reset-ti-sci.c...
14 #include <reset-uclass.h>
18  * struct ti_sci_reset_data - reset controller information structure
32 		return -ENOMEM;  in ti_sci_reset_probe()
35 	data->sci = ti_sci_get_handle(dev);  in ti_sci_reset_probe()
36 	if (IS_ERR(data->sci))  in ti_sci_reset_probe()
37 		return PTR_ERR(data->sci);  in ti_sci_reset_probe()
42 static int ti_sci_reset_of_xlate(struct reset_ctl *rst,  in ti_sci_reset_of_xlate()  argument
45 	debug("%s(rst=%p, args_count=%d)\n", __func__, rst, args->args_count);  in ti_sci_reset_of_xlate()
47 	if (args->args_count != 2) {  in ti_sci_reset_of_xlate()
48 		debug("Invalid args_count: %d\n", args->args_count);  in ti_sci_reset_of_xlate()
49 		return -EINVAL;  in ti_sci_reset_of_xlate()
53 	 * On TI SCI-based devices, the reset provider id field is used as a  in ti_sci_reset_of_xlate()
56 	rst->id = args->args[0];  in ti_sci_reset_of_xlate()
57 	rst->data = args->args[1];  in ti_sci_reset_of_xlate()
62 static int ti_sci_reset_request(struct reset_ctl *rst)  in ti_sci_reset_request()  argument
64 	debug("%s(rst=%p)\n", __func__, rst);  in ti_sci_reset_request()
68 static int ti_sci_reset_free(struct reset_ctl *rst)  in ti_sci_reset_free()  argument
70 	debug("%s(rst=%p)\n", __func__, rst);  in ti_sci_reset_free()
75  * ti_sci_reset_set() - program a device's reset
76  * @rst: Handle to a single reset signal
82  * The mechanism itself is a read-modify-write procedure, the current device
84  * set or un-set using the reset's mask, and the new reset value written by
89 static int ti_sci_reset_set(struct reset_ctl *rst, bool assert)  in ti_sci_reset_set()  argument
91 	struct ti_sci_reset_data *data = dev_get_priv(rst->dev);  in ti_sci_reset_set()
92 	const struct ti_sci_handle *sci = data->sci;  in ti_sci_reset_set()
93 	const struct ti_sci_dev_ops *dops = &sci->ops.dev_ops;  in ti_sci_reset_set()
97 	ret = dops->get_device_resets(sci, rst->id, &reset_state);  in ti_sci_reset_set()
99 		dev_err(rst->dev, "%s: get_device_resets failed (%d)\n",  in ti_sci_reset_set()
105 		reset_state |= rst->data;  in ti_sci_reset_set()
107 		reset_state &= ~rst->data;  in ti_sci_reset_set()
109 	ret = dops->set_device_resets(sci, rst->id, reset_state);  in ti_sci_reset_set()
111 		dev_err(rst->dev, "%s: set_device_resets failed (%d)\n",  in ti_sci_reset_set()
120  * ti_sci_reset_assert() - assert device reset
121  * @rst: Handle to a single reset signal
130 static int ti_sci_reset_assert(struct reset_ctl *rst)  in ti_sci_reset_assert()  argument
132 	debug("%s(rst=%p)\n", __func__, rst);  in ti_sci_reset_assert()
133 	return ti_sci_reset_set(rst, true);  in ti_sci_reset_assert()
137  * ti_sci_reset_deassert() - deassert device reset
138  * @rst: Handle to a single reset signal
147 static int ti_sci_reset_deassert(struct reset_ctl *rst)  in ti_sci_reset_deassert()  argument
149 	debug("%s(rst=%p)\n", __func__, rst);  in ti_sci_reset_deassert()
150 	return ti_sci_reset_set(rst, false);  in ti_sci_reset_deassert()
154  * ti_sci_reset_status() - check device reset status
155  * @rst: Handle to a single reset signal
163  * Return: 0 if reset is deasserted, or a non-zero value if reset is asserted
165 static int ti_sci_reset_status(struct reset_ctl *rst)  in ti_sci_reset_status()  argument
167 	struct ti_sci_reset_data *data = dev_get_priv(rst->dev);  in ti_sci_reset_status()
168 	const struct ti_sci_handle *sci = data->sci;  in ti_sci_reset_status()
169 	const struct ti_sci_dev_ops *dops = &sci->ops.dev_ops;  in ti_sci_reset_status()
173 	debug("%s(rst=%p)\n", __func__, rst);  in ti_sci_reset_status()
175 	ret = dops->get_device_resets(sci, rst->id, &reset_state);  in ti_sci_reset_status()
177 		dev_err(rst->dev, "%s: get_device_resets failed (%d)\n",  in ti_sci_reset_status()
182 	return reset_state & rst->data;  in ti_sci_reset_status()
186 	{ .compatible = "ti,sci-reset", },
200 	.name = "ti-sci-reset",