1// SPDX-License-Identifier: GPL-2.0
  2//
  3// reset-uniphier-glue.c - Glue layer reset driver for UniPhier
  4// Copyright 2018 Socionext Inc.
  5// Author: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
  6
  7#include <linux/clk.h>
  8#include <linux/module.h>
  9#include <linux/of.h>
 10#include <linux/platform_device.h>
 11#include <linux/reset.h>
 12#include <linux/reset/reset-simple.h>
 13
 14#define MAX_CLKS	2
 15#define MAX_RSTS	2
 16
 17struct uniphier_glue_reset_soc_data {
 18	int nclks;
 19	const char * const *clock_names;
 20	int nrsts;
 21	const char * const *reset_names;
 22};
 23
 24struct uniphier_glue_reset_priv {
 25	struct clk_bulk_data clk[MAX_CLKS];
 26	struct reset_control_bulk_data rst[MAX_RSTS];
 27	struct reset_simple_data rdata;
 28	const struct uniphier_glue_reset_soc_data *data;
 29};
 30
 31static void uniphier_clk_disable(void *_priv)
 32{
 33	struct uniphier_glue_reset_priv *priv = _priv;
 34
 35	clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);
 36}
 37
 38static void uniphier_rst_assert(void *_priv)
 39{
 40	struct uniphier_glue_reset_priv *priv = _priv;
 41
 42	reset_control_bulk_assert(priv->data->nrsts, priv->rst);
 43}
 44
 45static int uniphier_glue_reset_probe(struct platform_device *pdev)
 46{
 47	struct device *dev = &pdev->dev;
 48	struct uniphier_glue_reset_priv *priv;
 49	struct resource *res;
 50	int i, ret;
 51
 52	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 53	if (!priv)
 54		return -ENOMEM;
 55
 56	priv->data = of_device_get_match_data(dev);
 57	if (WARN_ON(!priv->data || priv->data->nclks > MAX_CLKS ||
 58		    priv->data->nrsts > MAX_RSTS))
 59		return -EINVAL;
 60
 61	priv->rdata.membase = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 62	if (IS_ERR(priv->rdata.membase))
 63		return PTR_ERR(priv->rdata.membase);
 64
 65	for (i = 0; i < priv->data->nclks; i++)
 66		priv->clk[i].id = priv->data->clock_names[i];
 67	ret = devm_clk_bulk_get(dev, priv->data->nclks, priv->clk);
 68	if (ret)
 69		return ret;
 70
 71	for (i = 0; i < priv->data->nrsts; i++)
 72		priv->rst[i].id = priv->data->reset_names[i];
 73	ret = devm_reset_control_bulk_get_shared(dev, priv->data->nrsts,
 74						 priv->rst);
 75	if (ret)
 76		return ret;
 77
 78	ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk);
 79	if (ret)
 80		return ret;
 81
 82	ret = devm_add_action_or_reset(dev, uniphier_clk_disable, priv);
 83	if (ret)
 84		return ret;
 85
 86	ret = reset_control_bulk_deassert(priv->data->nrsts, priv->rst);
 87	if (ret)
 88		return ret;
 89
 90	ret = devm_add_action_or_reset(dev, uniphier_rst_assert, priv);
 91	if (ret)
 92		return ret;
 93
 94	spin_lock_init(&priv->rdata.lock);
 95	priv->rdata.rcdev.owner = THIS_MODULE;
 96	priv->rdata.rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE;
 97	priv->rdata.rcdev.ops = &reset_simple_ops;
 98	priv->rdata.rcdev.of_node = dev->of_node;
 99	priv->rdata.active_low = true;
100
101	return devm_reset_controller_register(dev, &priv->rdata.rcdev);
102}
103
104static const char * const uniphier_pro4_clock_reset_names[] = {
105	"gio", "link",
106};
107
108static const struct uniphier_glue_reset_soc_data uniphier_pro4_data = {
109	.nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
110	.clock_names = uniphier_pro4_clock_reset_names,
111	.nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
112	.reset_names = uniphier_pro4_clock_reset_names,
113};
114
115static const char * const uniphier_pxs2_clock_reset_names[] = {
116	"link",
117};
118
119static const struct uniphier_glue_reset_soc_data uniphier_pxs2_data = {
120	.nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
121	.clock_names = uniphier_pxs2_clock_reset_names,
122	.nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
123	.reset_names = uniphier_pxs2_clock_reset_names,
124};
125
126static const struct of_device_id uniphier_glue_reset_match[] = {
127	{
128		.compatible = "socionext,uniphier-pro4-usb3-reset",
129		.data = &uniphier_pro4_data,
130	},
131	{
132		.compatible = "socionext,uniphier-pro5-usb3-reset",
133		.data = &uniphier_pro4_data,
134	},
135	{
136		.compatible = "socionext,uniphier-pxs2-usb3-reset",
137		.data = &uniphier_pxs2_data,
138	},
139	{
140		.compatible = "socionext,uniphier-ld20-usb3-reset",
141		.data = &uniphier_pxs2_data,
142	},
143	{
144		.compatible = "socionext,uniphier-pxs3-usb3-reset",
145		.data = &uniphier_pxs2_data,
146	},
147	{
148		.compatible = "socionext,uniphier-nx1-usb3-reset",
149		.data = &uniphier_pxs2_data,
150	},
151	{
152		.compatible = "socionext,uniphier-pro4-ahci-reset",
153		.data = &uniphier_pro4_data,
154	},
155	{
156		.compatible = "socionext,uniphier-pxs2-ahci-reset",
157		.data = &uniphier_pxs2_data,
158	},
159	{
160		.compatible = "socionext,uniphier-pxs3-ahci-reset",
161		.data = &uniphier_pxs2_data,
162	},
163	{ /* Sentinel */ }
164};
165MODULE_DEVICE_TABLE(of, uniphier_glue_reset_match);
166
167static struct platform_driver uniphier_glue_reset_driver = {
168	.probe = uniphier_glue_reset_probe,
169	.driver = {
170		.name = "uniphier-glue-reset",
171		.of_match_table = uniphier_glue_reset_match,
172	},
173};
174module_platform_driver(uniphier_glue_reset_driver);
175
176MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
177MODULE_DESCRIPTION("UniPhier Glue layer reset driver");
178MODULE_LICENSE("GPL");