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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
37
38
39
40
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
51
52
53
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
106 va = (__force void *)(wkupm3->mem[i].cpu_addr + offset);
107 break;
108 }
109 }
110
111 return va;
112}
113
114static 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
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 wkupm3 = rproc->priv;
171 wkupm3->rproc = rproc;
172 wkupm3->pdev = pdev;
173
174 for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
175 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
176 mem_names[i]);
177 wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
178 if (IS_ERR(wkupm3->mem[i].cpu_addr)) {
179 dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
180 i);
181 ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
182 goto err;
183 }
184 wkupm3->mem[i].bus_addr = res->start;
185 wkupm3->mem[i].size = resource_size(res);
186 addrp = of_get_address(dev->of_node, i, &size, NULL);
187
188
189
190
191
192
193 if (!strcmp(mem_names[i], "umem"))
194 l4_offset = be32_to_cpu(*addrp);
195 wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset;
196 }
197
198 dev_set_drvdata(dev, rproc);
199
200 ret = rproc_add(rproc);
201 if (ret) {
202 dev_err(dev, "rproc_add failed\n");
203 goto err_put_rproc;
204 }
205
206 return 0;
207
208err_put_rproc:
209 rproc_put(rproc);
210err:
211 pm_runtime_put_noidle(dev);
212 pm_runtime_disable(dev);
213 return ret;
214}
215
216static int wkup_m3_rproc_remove(struct platform_device *pdev)
217{
218 struct rproc *rproc = platform_get_drvdata(pdev);
219
220 rproc_del(rproc);
221 rproc_put(rproc);
222 pm_runtime_put_sync(&pdev->dev);
223 pm_runtime_disable(&pdev->dev);
224
225 return 0;
226}
227
228#ifdef CONFIG_PM
229static int wkup_m3_rpm_suspend(struct device *dev)
230{
231 return -EBUSY;
232}
233
234static int wkup_m3_rpm_resume(struct device *dev)
235{
236 return 0;
237}
238#endif
239
240static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {
241 SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL)
242};
243
244static struct platform_driver wkup_m3_rproc_driver = {
245 .probe = wkup_m3_rproc_probe,
246 .remove = wkup_m3_rproc_remove,
247 .driver = {
248 .name = "wkup_m3_rproc",
249 .of_match_table = wkup_m3_rproc_of_match,
250 .pm = &wkup_m3_rproc_pm_ops,
251 },
252};
253
254module_platform_driver(wkup_m3_rproc_driver);
255
256MODULE_LICENSE("GPL v2");
257MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");
258MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");
259
