reset-ti-sci.c 8.15 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269
/*
 * Texas Instrument's System Control Interface (TI-SCI) reset driver
 *
 * Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.ti.com/
 *	Andrew F. Davis <afd@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/idr.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/soc/ti/ti_sci_protocol.h>

/**
 * struct ti_sci_reset_control - reset control structure
 * @dev_id: SoC-specific device identifier
 * @reset_mask: reset mask to use for toggling reset
 * @lock: synchronize reset_mask read-modify-writes
 */
struct ti_sci_reset_control {
	u32 dev_id;
	u32 reset_mask;
	struct mutex lock;
};

/**
 * struct ti_sci_reset_data - reset controller information structure
 * @rcdev: reset controller entity
 * @dev: reset controller device pointer
 * @sci: TI SCI handle used for communication with system controller
 * @idr: idr structure for mapping ids to reset control structures
 */
struct ti_sci_reset_data {
	struct reset_controller_dev rcdev;
	struct device *dev;
	const struct ti_sci_handle *sci;
	struct idr idr;
};

#define to_ti_sci_reset_data(p)	\
	container_of((p), struct ti_sci_reset_data, rcdev)

/**
 * ti_sci_reset_set() - program a device's reset
 * @rcdev: reset controller entity
 * @id: ID of the reset to toggle
 * @assert: boolean flag to indicate assert or deassert
 *
 * This is a common internal function used to assert or deassert a device's
 * reset using the TI SCI protocol. The device's reset is asserted if the
 * @assert argument is true, or deasserted if @assert argument is false.
 * The mechanism itself is a read-modify-write procedure, the current device
 * reset register is read using a TI SCI device operation, the new value is
 * set or un-set using the reset's mask, and the new reset value written by
 * using another TI SCI device operation.
 *
 * Return: 0 for successful request, else a corresponding error value
 */
static int ti_sci_reset_set(struct reset_controller_dev *rcdev,
			    unsigned long id, bool assert)
{
	struct ti_sci_reset_data *data = to_ti_sci_reset_data(rcdev);
	const struct ti_sci_handle *sci = data->sci;
	const struct ti_sci_dev_ops *dev_ops = &sci->ops.dev_ops;
	struct ti_sci_reset_control *control;
	u32 reset_state;
	int ret;

	control = idr_find(&data->idr, id);
	if (!control)
		return -EINVAL;

	mutex_lock(&control->lock);

	ret = dev_ops->get_device_resets(sci, control->dev_id, &reset_state);
	if (ret)
		goto out;

	if (assert)
		reset_state |= control->reset_mask;
	else
		reset_state &= ~control->reset_mask;

	ret = dev_ops->set_device_resets(sci, control->dev_id, reset_state);
out:
	mutex_unlock(&control->lock);

	return ret;
}

/**
 * ti_sci_reset_assert() - assert device reset
 * @rcdev: reset controller entity
 * @id: ID of the reset to be asserted
 *
 * This function implements the reset driver op to assert a device's reset
 * using the TI SCI protocol. This invokes the function ti_sci_reset_set()
 * with the corresponding parameters as passed in, but with the @assert
 * argument set to true for asserting the reset.
 *
 * Return: 0 for successful request, else a corresponding error value
 */
static int ti_sci_reset_assert(struct reset_controller_dev *rcdev,
			       unsigned long id)
{
	return ti_sci_reset_set(rcdev, id, true);
}

/**
 * ti_sci_reset_deassert() - deassert device reset
 * @rcdev: reset controller entity
 * @id: ID of the reset to be deasserted
 *
 * This function implements the reset driver op to deassert a device's reset
 * using the TI SCI protocol. This invokes the function ti_sci_reset_set()
 * with the corresponding parameters as passed in, but with the @assert
 * argument set to false for deasserting the reset.
 *
 * Return: 0 for successful request, else a corresponding error value
 */
static int ti_sci_reset_deassert(struct reset_controller_dev *rcdev,
				 unsigned long id)
{
	return ti_sci_reset_set(rcdev, id, false);
}

/**
 * ti_sci_reset_status() - check device reset status
 * @rcdev: reset controller entity
 * @id: ID of reset to be checked
 *
 * This function implements the reset driver op to return the status of a
 * device's reset using the TI SCI protocol. The reset register value is read
 * by invoking the TI SCI device operation .get_device_resets(), and the
 * status of the specific reset is extracted and returned using this reset's
 * reset mask.
 *
 * Return: 0 if reset is deasserted, or a non-zero value if reset is asserted
 */
static int ti_sci_reset_status(struct reset_controller_dev *rcdev,
			       unsigned long id)
{
	struct ti_sci_reset_data *data = to_ti_sci_reset_data(rcdev);
	const struct ti_sci_handle *sci = data->sci;
	const struct ti_sci_dev_ops *dev_ops = &sci->ops.dev_ops;
	struct ti_sci_reset_control *control;
	u32 reset_state;
	int ret;

	control = idr_find(&data->idr, id);
	if (!control)
		return -EINVAL;

	ret = dev_ops->get_device_resets(sci, control->dev_id, &reset_state);
	if (ret)
		return ret;

	return reset_state & control->reset_mask;
}

static const struct reset_control_ops ti_sci_reset_ops = {
	.assert		= ti_sci_reset_assert,
	.deassert	= ti_sci_reset_deassert,
	.status		= ti_sci_reset_status,
};

/**
 * ti_sci_reset_of_xlate() - translate a set of OF arguments to a reset ID
 * @rcdev: reset controller entity
 * @reset_spec: OF reset argument specifier
 *
 * This function performs the translation of the reset argument specifier
 * values defined in a reset consumer device node. The function allocates a
 * reset control structure for that device reset, and will be used by the
 * driver for performing any reset functions on that reset. An idr structure
 * is allocated and used to map to the reset control structure. This idr
 * is used by the driver to do reset lookups.
 *
 * Return: 0 for successful request, else a corresponding error value
 */
static int ti_sci_reset_of_xlate(struct reset_controller_dev *rcdev,
				 const struct of_phandle_args *reset_spec)
{
	struct ti_sci_reset_data *data = to_ti_sci_reset_data(rcdev);
	struct ti_sci_reset_control *control;

	if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells))
		return -EINVAL;

	control = devm_kzalloc(data->dev, sizeof(*control), GFP_KERNEL);
	if (!control)
		return -ENOMEM;

	control->dev_id = reset_spec->args[0];
	control->reset_mask = reset_spec->args[1];
	mutex_init(&control->lock);

	return idr_alloc(&data->idr, control, 0, 0, GFP_KERNEL);
}

static const struct of_device_id ti_sci_reset_of_match[] = {
	{ .compatible = "ti,sci-reset", },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ti_sci_reset_of_match);

static int ti_sci_reset_probe(struct platform_device *pdev)
{
	struct ti_sci_reset_data *data;

	if (!pdev->dev.of_node)
		return -ENODEV;

	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->sci = devm_ti_sci_get_handle(&pdev->dev);
	if (IS_ERR(data->sci))
		return PTR_ERR(data->sci);

	data->rcdev.ops = &ti_sci_reset_ops;
	data->rcdev.owner = THIS_MODULE;
	data->rcdev.of_node = pdev->dev.of_node;
	data->rcdev.of_reset_n_cells = 2;
	data->rcdev.of_xlate = ti_sci_reset_of_xlate;
	data->dev = &pdev->dev;
	idr_init(&data->idr);

	platform_set_drvdata(pdev, data);

	return reset_controller_register(&data->rcdev);
}

static int ti_sci_reset_remove(struct platform_device *pdev)
{
	struct ti_sci_reset_data *data = platform_get_drvdata(pdev);

	reset_controller_unregister(&data->rcdev);

	idr_destroy(&data->idr);

	return 0;
}

static struct platform_driver ti_sci_reset_driver = {
	.probe = ti_sci_reset_probe,
	.remove = ti_sci_reset_remove,
	.driver = {
		.name = "ti-sci-reset",
		.of_match_table = ti_sci_reset_of_match,
	},
};
module_platform_driver(ti_sci_reset_driver);

MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
MODULE_DESCRIPTION("TI System Control Interface (TI SCI) Reset driver");
MODULE_LICENSE("GPL v2");