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11#include <linux/err.h>
12#include <linux/interrupt.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/of_device.h>
16#include <linux/of_address.h>
17#include <linux/platform_device.h>
18#include <linux/pm_runtime.h>
19#include <linux/remoteproc.h>
20#include <linux/reset.h>
21
22#include <linux/platform_data/wkup_m3.h>
23
24#include "remoteproc_internal.h"
25
26#define WKUPM3_MEM_MAX 2
27
28
29
30
31
32
33
34
35struct wkup_m3_mem {
36 void __iomem *cpu_addr;
37 phys_addr_t bus_addr;
38 u32 dev_addr;
39 size_t size;
40};
41
42
43
44
45
46
47
48
49struct wkup_m3_rproc {
50 struct rproc *rproc;
51 struct platform_device *pdev;
52 struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
53 struct reset_control *rsts;
54};
55
56static int wkup_m3_rproc_start(struct rproc *rproc)
57{
58 struct wkup_m3_rproc *wkupm3 = rproc->priv;
59 struct platform_device *pdev = wkupm3->pdev;
60 struct device *dev = &pdev->dev;
61 struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
62 int error = 0;
63
64 error = reset_control_deassert(wkupm3->rsts);
65
66 if (!wkupm3->rsts && pdata->deassert_reset(pdev, pdata->reset_name)) {
67 dev_err(dev, "Unable to reset wkup_m3!\n");
68 error = -ENODEV;
69 }
70
71 return error;
72}
73
74static int wkup_m3_rproc_stop(struct rproc *rproc)
75{
76 struct wkup_m3_rproc *wkupm3 = rproc->priv;
77 struct platform_device *pdev = wkupm3->pdev;
78 struct device *dev = &pdev->dev;
79 struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
80 int error = 0;
81
82 error = reset_control_assert(wkupm3->rsts);
83
84 if (!wkupm3->rsts && pdata->assert_reset(pdev, pdata->reset_name)) {
85 dev_err(dev, "Unable to assert reset of wkup_m3!\n");
86 error = -ENODEV;
87 }
88
89 return error;
90}
91
92static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
93{
94 struct wkup_m3_rproc *wkupm3 = rproc->priv;
95 void *va = NULL;
96 int i;
97 u32 offset;
98
99 if (len == 0)
100 return NULL;
101
102 for (i = 0; i < WKUPM3_MEM_MAX; i++) {
103 if (da >= wkupm3->mem[i].dev_addr && da + len <=
104 wkupm3->mem[i].dev_addr + wkupm3->mem[i].size) {
105 offset = da - wkupm3->mem[i].dev_addr;
106
107 va = (__force void *)(wkupm3->mem[i].cpu_addr + offset);
108 break;
109 }
110 }
111
112 return va;
113}
114
115static const struct rproc_ops wkup_m3_rproc_ops = {
116 .start = wkup_m3_rproc_start,
117 .stop = wkup_m3_rproc_stop,
118 .da_to_va = wkup_m3_rproc_da_to_va,
119};
120
121static const struct of_device_id wkup_m3_rproc_of_match[] = {
122 { .compatible = "ti,am3352-wkup-m3", },
123 { .compatible = "ti,am4372-wkup-m3", },
124 {},
125};
126MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match);
127
128static int wkup_m3_rproc_probe(struct platform_device *pdev)
129{
130 struct device *dev = &pdev->dev;
131 struct wkup_m3_platform_data *pdata = dev->platform_data;
132
133 const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" };
134 struct wkup_m3_rproc *wkupm3;
135 const char *fw_name;
136 struct rproc *rproc;
137 struct resource *res;
138 const __be32 *addrp;
139 u32 l4_offset = 0;
140 u64 size;
141 int ret;
142 int i;
143
144 ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
145 &fw_name);
146 if (ret) {
147 dev_err(dev, "No firmware filename given\n");
148 return -ENODEV;
149 }
150
151 pm_runtime_enable(&pdev->dev);
152 ret = pm_runtime_get_sync(&pdev->dev);
153 if (ret < 0) {
154 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
155 goto err;
156 }
157
158 rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops,
159 fw_name, sizeof(*wkupm3));
160 if (!rproc) {
161 ret = -ENOMEM;
162 goto err;
163 }
164
165 rproc->auto_boot = false;
166
167 wkupm3 = rproc->priv;
168 wkupm3->rproc = rproc;
169 wkupm3->pdev = pdev;
170
171 wkupm3->rsts = devm_reset_control_get_optional_shared(dev, "rstctrl");
172 if (IS_ERR(wkupm3->rsts))
173 return PTR_ERR(wkupm3->rsts);
174 if (!wkupm3->rsts) {
175 if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
176 pdata->reset_name)) {
177 dev_err(dev, "Platform data missing!\n");
178 ret = -ENODEV;
179 goto err_put_rproc;
180 }
181 }
182
183 for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
184 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
185 mem_names[i]);
186 wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
187 if (IS_ERR(wkupm3->mem[i].cpu_addr)) {
188 dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
189 i);
190 ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
191 goto err_put_rproc;
192 }
193 wkupm3->mem[i].bus_addr = res->start;
194 wkupm3->mem[i].size = resource_size(res);
195 addrp = of_get_address(dev->of_node, i, &size, NULL);
196
197
198
199
200
201
202 if (!strcmp(mem_names[i], "umem"))
203 l4_offset = be32_to_cpu(*addrp);
204 wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset;
205 }
206
207 dev_set_drvdata(dev, rproc);
208
209 ret = rproc_add(rproc);
210 if (ret) {
211 dev_err(dev, "rproc_add failed\n");
212 goto err_put_rproc;
213 }
214
215 return 0;
216
217err_put_rproc:
218 rproc_free(rproc);
219err:
220 pm_runtime_put_noidle(dev);
221 pm_runtime_disable(dev);
222 return ret;
223}
224
225static int wkup_m3_rproc_remove(struct platform_device *pdev)
226{
227 struct rproc *rproc = platform_get_drvdata(pdev);
228
229 rproc_del(rproc);
230 rproc_free(rproc);
231 pm_runtime_put_sync(&pdev->dev);
232 pm_runtime_disable(&pdev->dev);
233
234 return 0;
235}
236
237#ifdef CONFIG_PM
238static int wkup_m3_rpm_suspend(struct device *dev)
239{
240 return -EBUSY;
241}
242
243static int wkup_m3_rpm_resume(struct device *dev)
244{
245 return 0;
246}
247#endif
248
249static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {
250 SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL)
251};
252
253static struct platform_driver wkup_m3_rproc_driver = {
254 .probe = wkup_m3_rproc_probe,
255 .remove = wkup_m3_rproc_remove,
256 .driver = {
257 .name = "wkup_m3_rproc",
258 .of_match_table = wkup_m3_rproc_of_match,
259 .pm = &wkup_m3_rproc_pm_ops,
260 },
261};
262
263module_platform_driver(wkup_m3_rproc_driver);
264
265MODULE_LICENSE("GPL v2");
266MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");
267MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");
268
