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 int uniphier_glue_reset_probe(struct platform_device *pdev)
 39{
 40	struct device *dev = &pdev->dev;
 41	struct uniphier_glue_reset_priv *priv;
 42	struct resource *res;
 43	int i, ret;
 44
 45	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 46	if (!priv)
 47		return -ENOMEM;
 48
 49	priv->data = of_device_get_match_data(dev);
 50	if (WARN_ON(!priv->data || priv->data->nclks > MAX_CLKS ||
 51		    priv->data->nrsts > MAX_RSTS))
 52		return -EINVAL;
 53
 54	priv->rdata.membase = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 55	if (IS_ERR(priv->rdata.membase))
 56		return PTR_ERR(priv->rdata.membase);
 57
 58	for (i = 0; i < priv->data->nclks; i++)
 59		priv->clk[i].id = priv->data->clock_names[i];
 60	ret = devm_clk_bulk_get(dev, priv->data->nclks, priv->clk);
 61	if (ret)
 62		return ret;
 63
 64	ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk);
 65	if (ret)
 66		return ret;
 67
 68	ret = devm_add_action_or_reset(dev, uniphier_clk_disable, priv);
 69	if (ret)
 70		return ret;
 71
 72	for (i = 0; i < priv->data->nrsts; i++)
 73		priv->rst[i].id = priv->data->reset_names[i];
 74	ret = devm_reset_control_bulk_get_shared_deasserted(dev,
 75							    priv->data->nrsts,
 76							    priv->rst);
 77	if (ret)
 78		return ret;
 79
 80	spin_lock_init(&priv->rdata.lock);
 81	priv->rdata.rcdev.owner = THIS_MODULE;
 82	priv->rdata.rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE;
 83	priv->rdata.rcdev.ops = &reset_simple_ops;
 84	priv->rdata.rcdev.of_node = dev->of_node;
 85	priv->rdata.active_low = true;
 86
 87	return devm_reset_controller_register(dev, &priv->rdata.rcdev);
 88}
 89
 90static const char * const uniphier_pro4_clock_reset_names[] = {
 91	"gio", "link",
 92};
 93
 94static const struct uniphier_glue_reset_soc_data uniphier_pro4_data = {
 95	.nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
 96	.clock_names = uniphier_pro4_clock_reset_names,
 97	.nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
 98	.reset_names = uniphier_pro4_clock_reset_names,
 99};
100
101static const char * const uniphier_pxs2_clock_reset_names[] = {
102	"link",
103};
104
105static const struct uniphier_glue_reset_soc_data uniphier_pxs2_data = {
106	.nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
107	.clock_names = uniphier_pxs2_clock_reset_names,
108	.nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
109	.reset_names = uniphier_pxs2_clock_reset_names,
110};
111
112static const struct of_device_id uniphier_glue_reset_match[] = {
113	{
114		.compatible = "socionext,uniphier-pro4-usb3-reset",
115		.data = &uniphier_pro4_data,
116	},
117	{
118		.compatible = "socionext,uniphier-pro5-usb3-reset",
119		.data = &uniphier_pro4_data,
120	},
121	{
122		.compatible = "socionext,uniphier-pxs2-usb3-reset",
123		.data = &uniphier_pxs2_data,
124	},
125	{
126		.compatible = "socionext,uniphier-ld20-usb3-reset",
127		.data = &uniphier_pxs2_data,
128	},
129	{
130		.compatible = "socionext,uniphier-pxs3-usb3-reset",
131		.data = &uniphier_pxs2_data,
132	},
133	{
134		.compatible = "socionext,uniphier-nx1-usb3-reset",
135		.data = &uniphier_pxs2_data,
136	},
137	{
138		.compatible = "socionext,uniphier-pro4-ahci-reset",
139		.data = &uniphier_pro4_data,
140	},
141	{
142		.compatible = "socionext,uniphier-pxs2-ahci-reset",
143		.data = &uniphier_pxs2_data,
144	},
145	{
146		.compatible = "socionext,uniphier-pxs3-ahci-reset",
147		.data = &uniphier_pxs2_data,
148	},
149	{ /* Sentinel */ }
150};
151MODULE_DEVICE_TABLE(of, uniphier_glue_reset_match);
152
153static struct platform_driver uniphier_glue_reset_driver = {
154	.probe = uniphier_glue_reset_probe,
155	.driver = {
156		.name = "uniphier-glue-reset",
157		.of_match_table = uniphier_glue_reset_match,
158	},
159};
160module_platform_driver(uniphier_glue_reset_driver);
161
162MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
163MODULE_DESCRIPTION("UniPhier Glue layer reset driver");
164MODULE_LICENSE("GPL");