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1/*
2 * TI AMx3 Wakeup M3 Remote Processor driver
3 *
4 * Copyright (C) 2014-2015 Texas Instruments, Inc.
5 *
6 * Dave Gerlach <d-gerlach@ti.com>
7 * Suman Anna <s-anna@ti.com>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * version 2 as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18
19#include <linux/err.h>
20#include <linux/interrupt.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/of_device.h>
24#include <linux/of_address.h>
25#include <linux/platform_device.h>
26#include <linux/pm_runtime.h>
27#include <linux/remoteproc.h>
28
29#include <linux/platform_data/wkup_m3.h>
30
31#include "remoteproc_internal.h"
32
33#define WKUPM3_MEM_MAX 2
34
35/**
36 * struct wkup_m3_mem - WkupM3 internal memory structure
37 * @cpu_addr: MPU virtual address of the memory region
38 * @bus_addr: Bus address used to access the memory region
39 * @dev_addr: Device address from Wakeup M3 view
40 * @size: Size of the memory region
41 */
42struct wkup_m3_mem {
43 void __iomem *cpu_addr;
44 phys_addr_t bus_addr;
45 u32 dev_addr;
46 size_t size;
47};
48
49/**
50 * struct wkup_m3_rproc - WkupM3 remote processor state
51 * @rproc: rproc handle
52 * @pdev: pointer to platform device
53 * @mem: WkupM3 memory information
54 */
55struct wkup_m3_rproc {
56 struct rproc *rproc;
57 struct platform_device *pdev;
58 struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
59};
60
61static int wkup_m3_rproc_start(struct rproc *rproc)
62{
63 struct wkup_m3_rproc *wkupm3 = rproc->priv;
64 struct platform_device *pdev = wkupm3->pdev;
65 struct device *dev = &pdev->dev;
66 struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
67
68 if (pdata->deassert_reset(pdev, pdata->reset_name)) {
69 dev_err(dev, "Unable to reset wkup_m3!\n");
70 return -ENODEV;
71 }
72
73 return 0;
74}
75
76static int wkup_m3_rproc_stop(struct rproc *rproc)
77{
78 struct wkup_m3_rproc *wkupm3 = rproc->priv;
79 struct platform_device *pdev = wkupm3->pdev;
80 struct device *dev = &pdev->dev;
81 struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
82
83 if (pdata->assert_reset(pdev, pdata->reset_name)) {
84 dev_err(dev, "Unable to assert reset of wkup_m3!\n");
85 return -ENODEV;
86 }
87
88 return 0;
89}
90
91static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
92{
93 struct wkup_m3_rproc *wkupm3 = rproc->priv;
94 void *va = NULL;
95 int i;
96 u32 offset;
97
98 if (len <= 0)
99 return NULL;
100
101 for (i = 0; i < WKUPM3_MEM_MAX; i++) {
102 if (da >= wkupm3->mem[i].dev_addr && da + len <=
103 wkupm3->mem[i].dev_addr + wkupm3->mem[i].size) {
104 offset = da - wkupm3->mem[i].dev_addr;
105 /* __force to make sparse happy with type conversion */
106 va = (__force void *)(wkupm3->mem[i].cpu_addr + offset);
107 break;
108 }
109 }
110
111 return va;
112}
113
114static const struct rproc_ops wkup_m3_rproc_ops = {
115 .start = wkup_m3_rproc_start,
116 .stop = wkup_m3_rproc_stop,
117 .da_to_va = wkup_m3_rproc_da_to_va,
118};
119
120static const struct of_device_id wkup_m3_rproc_of_match[] = {
121 { .compatible = "ti,am3352-wkup-m3", },
122 { .compatible = "ti,am4372-wkup-m3", },
123 {},
124};
125MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match);
126
127static int wkup_m3_rproc_probe(struct platform_device *pdev)
128{
129 struct device *dev = &pdev->dev;
130 struct wkup_m3_platform_data *pdata = dev->platform_data;
131 /* umem always needs to be processed first */
132 const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" };
133 struct wkup_m3_rproc *wkupm3;
134 const char *fw_name;
135 struct rproc *rproc;
136 struct resource *res;
137 const __be32 *addrp;
138 u32 l4_offset = 0;
139 u64 size;
140 int ret;
141 int i;
142
143 if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
144 pdata->reset_name)) {
145 dev_err(dev, "Platform data missing!\n");
146 return -ENODEV;
147 }
148
149 ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
150 &fw_name);
151 if (ret) {
152 dev_err(dev, "No firmware filename given\n");
153 return -ENODEV;
154 }
155
156 pm_runtime_enable(&pdev->dev);
157 ret = pm_runtime_get_sync(&pdev->dev);
158 if (ret < 0) {
159 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
160 goto err;
161 }
162
163 rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops,
164 fw_name, sizeof(*wkupm3));
165 if (!rproc) {
166 ret = -ENOMEM;
167 goto err;
168 }
169
170 rproc->auto_boot = false;
171
172 wkupm3 = rproc->priv;
173 wkupm3->rproc = rproc;
174 wkupm3->pdev = pdev;
175
176 for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
177 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
178 mem_names[i]);
179 wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
180 if (IS_ERR(wkupm3->mem[i].cpu_addr)) {
181 dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
182 i);
183 ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
184 goto err;
185 }
186 wkupm3->mem[i].bus_addr = res->start;
187 wkupm3->mem[i].size = resource_size(res);
188 addrp = of_get_address(dev->of_node, i, &size, NULL);
189 /*
190 * The wkupm3 has umem at address 0 in its view, so the device
191 * addresses for each memory region is computed as a relative
192 * offset of the bus address for umem, and therefore needs to be
193 * processed first.
194 */
195 if (!strcmp(mem_names[i], "umem"))
196 l4_offset = be32_to_cpu(*addrp);
197 wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset;
198 }
199
200 dev_set_drvdata(dev, rproc);
201
202 ret = rproc_add(rproc);
203 if (ret) {
204 dev_err(dev, "rproc_add failed\n");
205 goto err_put_rproc;
206 }
207
208 return 0;
209
210err_put_rproc:
211 rproc_free(rproc);
212err:
213 pm_runtime_put_noidle(dev);
214 pm_runtime_disable(dev);
215 return ret;
216}
217
218static int wkup_m3_rproc_remove(struct platform_device *pdev)
219{
220 struct rproc *rproc = platform_get_drvdata(pdev);
221
222 rproc_del(rproc);
223 rproc_free(rproc);
224 pm_runtime_put_sync(&pdev->dev);
225 pm_runtime_disable(&pdev->dev);
226
227 return 0;
228}
229
230#ifdef CONFIG_PM
231static int wkup_m3_rpm_suspend(struct device *dev)
232{
233 return -EBUSY;
234}
235
236static int wkup_m3_rpm_resume(struct device *dev)
237{
238 return 0;
239}
240#endif
241
242static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {
243 SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL)
244};
245
246static struct platform_driver wkup_m3_rproc_driver = {
247 .probe = wkup_m3_rproc_probe,
248 .remove = wkup_m3_rproc_remove,
249 .driver = {
250 .name = "wkup_m3_rproc",
251 .of_match_table = wkup_m3_rproc_of_match,
252 .pm = &wkup_m3_rproc_pm_ops,
253 },
254};
255
256module_platform_driver(wkup_m3_rproc_driver);
257
258MODULE_LICENSE("GPL v2");
259MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");
260MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");
261

Warning: That file was not part of the compilation database. It may have many parsing errors.