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