1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) IoT.bzh 2021
  4 */
  5
  6#include <linux/limits.h>
  7#include <linux/module.h>
  8#include <linux/of.h>
  9#include <linux/of_reserved_mem.h>
 10#include <linux/platform_device.h>
 11#include <linux/pm_runtime.h>
 12#include <linux/remoteproc.h>
 13#include <linux/reset.h>
 14#include <linux/soc/renesas/rcar-rst.h>
 15
 16#include "remoteproc_internal.h"
 17
 18struct rcar_rproc {
 19	struct reset_control *rst;
 20};
 21
 22static int rcar_rproc_mem_alloc(struct rproc *rproc,
 23				 struct rproc_mem_entry *mem)
 24{
 25	struct device *dev = &rproc->dev;
 26	void *va;
 27
 28	dev_dbg(dev, "map memory: %pa+%zx\n", &mem->dma, mem->len);
 29	va = ioremap_wc(mem->dma, mem->len);
 30	if (!va) {
 31		dev_err(dev, "Unable to map memory region: %pa+%zx\n",
 32			&mem->dma, mem->len);
 33		return -ENOMEM;
 34	}
 35
 36	/* Update memory entry va */
 37	mem->va = va;
 38
 39	return 0;
 40}
 41
 42static int rcar_rproc_mem_release(struct rproc *rproc,
 43				   struct rproc_mem_entry *mem)
 44{
 45	dev_dbg(&rproc->dev, "unmap memory: %pa\n", &mem->dma);
 46	iounmap(mem->va);
 47
 48	return 0;
 49}
 50
 51static int rcar_rproc_prepare(struct rproc *rproc)
 52{
 53	struct device *dev = rproc->dev.parent;
 54	struct device_node *np = dev->of_node;
 55	struct of_phandle_iterator it;
 56	struct rproc_mem_entry *mem;
 57	struct reserved_mem *rmem;
 58	u32 da;
 59
 60	/* Register associated reserved memory regions */
 61	of_phandle_iterator_init(&it, np, "memory-region", NULL, 0);
 62	while (of_phandle_iterator_next(&it) == 0) {
 63
 64		rmem = of_reserved_mem_lookup(it.node);
 65		if (!rmem) {
 66			of_node_put(it.node);
 67			dev_err(&rproc->dev,
 68				"unable to acquire memory-region\n");
 69			return -EINVAL;
 70		}
 71
 72		if (rmem->base > U32_MAX) {
 73			of_node_put(it.node);
 74			return -EINVAL;
 75		}
 76
 77		/* No need to translate pa to da, R-Car use same map */
 78		da = rmem->base;
 79		mem = rproc_mem_entry_init(dev, NULL,
 80					   rmem->base,
 81					   rmem->size, da,
 82					   rcar_rproc_mem_alloc,
 83					   rcar_rproc_mem_release,
 84					   it.node->name);
 85
 86		if (!mem) {
 87			of_node_put(it.node);
 88			return -ENOMEM;
 89		}
 90
 91		rproc_add_carveout(rproc, mem);
 92	}
 93
 94	return 0;
 95}
 96
 97static int rcar_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
 98{
 99	int ret;
100
101	ret = rproc_elf_load_rsc_table(rproc, fw);
102	if (ret)
103		dev_info(&rproc->dev, "No resource table in elf\n");
104
105	return 0;
106}
107
108static int rcar_rproc_start(struct rproc *rproc)
109{
110	struct rcar_rproc *priv = rproc->priv;
111	int err;
112
113	if (!rproc->bootaddr)
114		return -EINVAL;
115
116	err = rcar_rst_set_rproc_boot_addr(rproc->bootaddr);
117	if (err) {
118		dev_err(&rproc->dev, "failed to set rproc boot addr\n");
119		return err;
120	}
121
122	err = reset_control_deassert(priv->rst);
123	if (err)
124		dev_err(&rproc->dev, "failed to deassert reset\n");
125
126	return err;
127}
128
129static int rcar_rproc_stop(struct rproc *rproc)
130{
131	struct rcar_rproc *priv = rproc->priv;
132	int err;
133
134	err = reset_control_assert(priv->rst);
135	if (err)
136		dev_err(&rproc->dev, "failed to assert reset\n");
137
138	return err;
139}
140
141static struct rproc_ops rcar_rproc_ops = {
142	.prepare	= rcar_rproc_prepare,
143	.start		= rcar_rproc_start,
144	.stop		= rcar_rproc_stop,
145	.load		= rproc_elf_load_segments,
146	.parse_fw	= rcar_rproc_parse_fw,
147	.find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
148	.sanity_check	= rproc_elf_sanity_check,
149	.get_boot_addr	= rproc_elf_get_boot_addr,
150
151};
152
153static int rcar_rproc_probe(struct platform_device *pdev)
154{
155	struct device *dev = &pdev->dev;
156	struct device_node *np = dev->of_node;
157	struct rcar_rproc *priv;
158	struct rproc *rproc;
159	int ret;
160
161	rproc = devm_rproc_alloc(dev, np->name, &rcar_rproc_ops,
162				NULL, sizeof(*priv));
163	if (!rproc)
164		return -ENOMEM;
165
166	priv = rproc->priv;
167
168	priv->rst = devm_reset_control_get_exclusive(dev, NULL);
169	if (IS_ERR(priv->rst)) {
170		ret = PTR_ERR(priv->rst);
171		dev_err_probe(dev, ret, "fail to acquire rproc reset\n");
172		return ret;
173	}
174
175	pm_runtime_enable(dev);
176	ret = pm_runtime_resume_and_get(dev);
177	if (ret) {
178		dev_err(dev, "failed to power up\n");
179		return ret;
180	}
181
182	dev_set_drvdata(dev, rproc);
183
184	/* Manually start the rproc */
185	rproc->auto_boot = false;
186
187	ret = devm_rproc_add(dev, rproc);
188	if (ret) {
189		dev_err(dev, "rproc_add failed\n");
190		goto pm_disable;
191	}
192
193	return 0;
194
195pm_disable:
196	pm_runtime_disable(dev);
197
198	return ret;
199}
200
201static void rcar_rproc_remove(struct platform_device *pdev)
202{
203	struct device *dev = &pdev->dev;
204
205	pm_runtime_disable(dev);
206}
207
208static const struct of_device_id rcar_rproc_of_match[] = {
209	{ .compatible = "renesas,rcar-cr7" },
210	{},
211};
212
213MODULE_DEVICE_TABLE(of, rcar_rproc_of_match);
214
215static struct platform_driver rcar_rproc_driver = {
216	.probe = rcar_rproc_probe,
217	.remove_new = rcar_rproc_remove,
218	.driver = {
219		.name = "rcar-rproc",
220		.of_match_table = rcar_rproc_of_match,
221	},
222};
223
224module_platform_driver(rcar_rproc_driver);
225
226MODULE_LICENSE("GPL v2");
227MODULE_DESCRIPTION("Renesas R-Car Gen3 remote processor control driver");
228MODULE_AUTHOR("Julien Massot <julien.massot@iot.bzh>");