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