This source file includes following definitions.
- rt2880_get_group_count
- rt2880_get_group_name
- rt2880_get_group_pins
- rt2880_pmx_func_count
- rt2880_pmx_func_name
- rt2880_pmx_group_get_groups
- rt2880_pmx_group_enable
- rt2880_pmx_group_gpio_request_enable
- rt2880_pinmux_index
- rt2880_pinmux_pins
- rt2880_pinmux_probe
- rt2880_pinmux_init
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6 #include <linux/module.h>
7 #include <linux/device.h>
8 #include <linux/io.h>
9 #include <linux/platform_device.h>
10 #include <linux/slab.h>
11 #include <linux/of.h>
12 #include <linux/pinctrl/pinctrl.h>
13 #include <linux/pinctrl/pinconf.h>
14 #include <linux/pinctrl/pinconf-generic.h>
15 #include <linux/pinctrl/pinmux.h>
16 #include <linux/pinctrl/consumer.h>
17 #include <linux/pinctrl/machine.h>
18
19 #include <asm/mach-ralink/ralink_regs.h>
20 #include <asm/mach-ralink/pinmux.h>
21 #include <asm/mach-ralink/mt7620.h>
22
23 #include "core.h"
24 #include "pinctrl-utils.h"
25
26 #define SYSC_REG_GPIO_MODE 0x60
27 #define SYSC_REG_GPIO_MODE2 0x64
28
29 struct rt2880_priv {
30 struct device *dev;
31
32 struct pinctrl_pin_desc *pads;
33 struct pinctrl_desc *desc;
34
35 struct rt2880_pmx_func **func;
36 int func_count;
37
38 struct rt2880_pmx_group *groups;
39 const char **group_names;
40 int group_count;
41
42 u8 *gpio;
43 int max_pins;
44 };
45
46 static int rt2880_get_group_count(struct pinctrl_dev *pctrldev)
47 {
48 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
49
50 return p->group_count;
51 }
52
53 static const char *rt2880_get_group_name(struct pinctrl_dev *pctrldev,
54 unsigned int group)
55 {
56 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
57
58 return (group >= p->group_count) ? NULL : p->group_names[group];
59 }
60
61 static int rt2880_get_group_pins(struct pinctrl_dev *pctrldev,
62 unsigned int group,
63 const unsigned int **pins,
64 unsigned int *num_pins)
65 {
66 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
67
68 if (group >= p->group_count)
69 return -EINVAL;
70
71 *pins = p->groups[group].func[0].pins;
72 *num_pins = p->groups[group].func[0].pin_count;
73
74 return 0;
75 }
76
77 static const struct pinctrl_ops rt2880_pctrl_ops = {
78 .get_groups_count = rt2880_get_group_count,
79 .get_group_name = rt2880_get_group_name,
80 .get_group_pins = rt2880_get_group_pins,
81 .dt_node_to_map = pinconf_generic_dt_node_to_map_all,
82 .dt_free_map = pinconf_generic_dt_free_map,
83 };
84
85 static int rt2880_pmx_func_count(struct pinctrl_dev *pctrldev)
86 {
87 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
88
89 return p->func_count;
90 }
91
92 static const char *rt2880_pmx_func_name(struct pinctrl_dev *pctrldev,
93 unsigned int func)
94 {
95 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
96
97 return p->func[func]->name;
98 }
99
100 static int rt2880_pmx_group_get_groups(struct pinctrl_dev *pctrldev,
101 unsigned int func,
102 const char * const **groups,
103 unsigned int * const num_groups)
104 {
105 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
106
107 if (p->func[func]->group_count == 1)
108 *groups = &p->group_names[p->func[func]->groups[0]];
109 else
110 *groups = p->group_names;
111
112 *num_groups = p->func[func]->group_count;
113
114 return 0;
115 }
116
117 static int rt2880_pmx_group_enable(struct pinctrl_dev *pctrldev,
118 unsigned int func, unsigned int group)
119 {
120 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
121 u32 mode = 0;
122 u32 reg = SYSC_REG_GPIO_MODE;
123 int i;
124 int shift;
125
126
127 if (p->groups[group].enabled) {
128 dev_err(p->dev, "%s is already enabled\n",
129 p->groups[group].name);
130 return -EBUSY;
131 }
132
133 p->groups[group].enabled = 1;
134 p->func[func]->enabled = 1;
135
136 shift = p->groups[group].shift;
137 if (shift >= 32) {
138 shift -= 32;
139 reg = SYSC_REG_GPIO_MODE2;
140 }
141 mode = rt_sysc_r32(reg);
142 mode &= ~(p->groups[group].mask << shift);
143
144
145 for (i = 0; i < p->groups[group].func[0].pin_count; i++)
146 p->gpio[p->groups[group].func[0].pins[i]] = 1;
147
148
149 if (func == 0) {
150 mode |= p->groups[group].gpio << shift;
151 } else {
152 for (i = 0; i < p->func[func]->pin_count; i++)
153 p->gpio[p->func[func]->pins[i]] = 0;
154 mode |= p->func[func]->value << shift;
155 }
156 rt_sysc_w32(mode, reg);
157
158 return 0;
159 }
160
161 static int rt2880_pmx_group_gpio_request_enable(struct pinctrl_dev *pctrldev,
162 struct pinctrl_gpio_range *range,
163 unsigned int pin)
164 {
165 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
166
167 if (!p->gpio[pin]) {
168 dev_err(p->dev, "pin %d is not set to gpio mux\n", pin);
169 return -EINVAL;
170 }
171
172 return 0;
173 }
174
175 static const struct pinmux_ops rt2880_pmx_group_ops = {
176 .get_functions_count = rt2880_pmx_func_count,
177 .get_function_name = rt2880_pmx_func_name,
178 .get_function_groups = rt2880_pmx_group_get_groups,
179 .set_mux = rt2880_pmx_group_enable,
180 .gpio_request_enable = rt2880_pmx_group_gpio_request_enable,
181 };
182
183 static struct pinctrl_desc rt2880_pctrl_desc = {
184 .owner = THIS_MODULE,
185 .name = "rt2880-pinmux",
186 .pctlops = &rt2880_pctrl_ops,
187 .pmxops = &rt2880_pmx_group_ops,
188 };
189
190 static struct rt2880_pmx_func gpio_func = {
191 .name = "gpio",
192 };
193
194 static int rt2880_pinmux_index(struct rt2880_priv *p)
195 {
196 struct rt2880_pmx_func **f;
197 struct rt2880_pmx_group *mux = p->groups;
198 int i, j, c = 0;
199
200
201 while (mux->name) {
202 p->group_count++;
203 mux++;
204 }
205
206
207 p->group_names = devm_kcalloc(p->dev, p->group_count,
208 sizeof(char *), GFP_KERNEL);
209 if (!p->group_names)
210 return -1;
211
212 for (i = 0; i < p->group_count; i++) {
213 p->group_names[i] = p->groups[i].name;
214 p->func_count += p->groups[i].func_count;
215 }
216
217
218 p->func_count++;
219
220
221 f = p->func = devm_kcalloc(p->dev,
222 p->func_count,
223 sizeof(struct rt2880_pmx_func),
224 GFP_KERNEL);
225 gpio_func.groups = devm_kcalloc(p->dev, p->group_count, sizeof(int),
226 GFP_KERNEL);
227 if (!f || !gpio_func.groups)
228 return -1;
229
230
231 gpio_func.group_count = p->group_count;
232 for (i = 0; i < gpio_func.group_count; i++)
233 gpio_func.groups[i] = i;
234
235 f[c] = &gpio_func;
236 c++;
237
238
239 for (i = 0; i < p->group_count; i++) {
240 for (j = 0; j < p->groups[i].func_count; j++) {
241 f[c] = &p->groups[i].func[j];
242 f[c]->groups = devm_kzalloc(p->dev, sizeof(int),
243 GFP_KERNEL);
244 f[c]->groups[0] = i;
245 f[c]->group_count = 1;
246 c++;
247 }
248 }
249 return 0;
250 }
251
252 static int rt2880_pinmux_pins(struct rt2880_priv *p)
253 {
254 int i, j;
255
256
257
258
259
260 for (i = 0; i < p->func_count; i++) {
261 int pin;
262
263 if (!p->func[i]->pin_count)
264 continue;
265
266 p->func[i]->pins = devm_kcalloc(p->dev,
267 p->func[i]->pin_count,
268 sizeof(int),
269 GFP_KERNEL);
270 for (j = 0; j < p->func[i]->pin_count; j++)
271 p->func[i]->pins[j] = p->func[i]->pin_first + j;
272
273 pin = p->func[i]->pin_first + p->func[i]->pin_count;
274 if (pin > p->max_pins)
275 p->max_pins = pin;
276 }
277
278
279 p->gpio = devm_kcalloc(p->dev, p->max_pins, sizeof(u8), GFP_KERNEL);
280
281 p->pads = devm_kcalloc(p->dev, p->max_pins,
282 sizeof(struct pinctrl_pin_desc), GFP_KERNEL);
283 if (!p->pads || !p->gpio) {
284 dev_err(p->dev, "Failed to allocate gpio data\n");
285 return -ENOMEM;
286 }
287
288 memset(p->gpio, 1, sizeof(u8) * p->max_pins);
289 for (i = 0; i < p->func_count; i++) {
290 if (!p->func[i]->pin_count)
291 continue;
292
293 for (j = 0; j < p->func[i]->pin_count; j++)
294 p->gpio[p->func[i]->pins[j]] = 0;
295 }
296
297
298 p->gpio[0] = 1;
299
300
301 for (i = 0; i < p->max_pins; i++) {
302
303 char *name = devm_kzalloc(p->dev, 5, GFP_KERNEL);
304
305 if (!name)
306 return -ENOMEM;
307 snprintf(name, 5, "io%d", i);
308 p->pads[i].number = i;
309 p->pads[i].name = name;
310 }
311 p->desc->pins = p->pads;
312 p->desc->npins = p->max_pins;
313
314 return 0;
315 }
316
317 static int rt2880_pinmux_probe(struct platform_device *pdev)
318 {
319 struct rt2880_priv *p;
320 struct pinctrl_dev *dev;
321 struct device_node *np;
322
323 if (!rt2880_pinmux_data)
324 return -ENOTSUPP;
325
326
327 p = devm_kzalloc(&pdev->dev, sizeof(struct rt2880_priv), GFP_KERNEL);
328 if (!p)
329 return -ENOMEM;
330
331 p->dev = &pdev->dev;
332 p->desc = &rt2880_pctrl_desc;
333 p->groups = rt2880_pinmux_data;
334 platform_set_drvdata(pdev, p);
335
336
337 if (rt2880_pinmux_index(p)) {
338 dev_err(&pdev->dev, "failed to load index\n");
339 return -EINVAL;
340 }
341 if (rt2880_pinmux_pins(p)) {
342 dev_err(&pdev->dev, "failed to load pins\n");
343 return -EINVAL;
344 }
345 dev = pinctrl_register(p->desc, &pdev->dev, p);
346 if (IS_ERR(dev))
347 return PTR_ERR(dev);
348
349
350 for_each_compatible_node(np, NULL, "ralink,rt2880-gpio") {
351 const __be32 *ngpio, *gpiobase;
352 struct pinctrl_gpio_range *range;
353
354 if (!of_device_is_available(np))
355 continue;
356
357 ngpio = of_get_property(np, "ralink,num-gpios", NULL);
358 gpiobase = of_get_property(np, "ralink,gpio-base", NULL);
359 if (!ngpio || !gpiobase) {
360 dev_err(&pdev->dev, "failed to load chip info\n");
361 of_node_put(np);
362 return -EINVAL;
363 }
364
365 range = devm_kzalloc(p->dev, sizeof(*range), GFP_KERNEL);
366 if (!range) {
367 of_node_put(np);
368 return -ENOMEM;
369 }
370 range->name = "pio";
371 range->npins = __be32_to_cpu(*ngpio);
372 range->base = __be32_to_cpu(*gpiobase);
373 range->pin_base = range->base;
374 pinctrl_add_gpio_range(dev, range);
375 }
376
377 return 0;
378 }
379
380 static const struct of_device_id rt2880_pinmux_match[] = {
381 { .compatible = "ralink,rt2880-pinmux" },
382 {},
383 };
384 MODULE_DEVICE_TABLE(of, rt2880_pinmux_match);
385
386 static struct platform_driver rt2880_pinmux_driver = {
387 .probe = rt2880_pinmux_probe,
388 .driver = {
389 .name = "rt2880-pinmux",
390 .of_match_table = rt2880_pinmux_match,
391 },
392 };
393
394 int __init rt2880_pinmux_init(void)
395 {
396 return platform_driver_register(&rt2880_pinmux_driver);
397 }
398
399 core_initcall_sync(rt2880_pinmux_init);