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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/mt7620.h>
21
22#include "pinmux.h"
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
29struct 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
46static 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
53static 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
61static 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
77static 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
85static 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
92static 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
100static 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
117static 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 0;
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
161static 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
175static 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
183static 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
190static struct rt2880_pmx_func gpio_func = {
191 .name = "gpio",
192};
193
194static int rt2880_pinmux_index(struct rt2880_priv *p)
195{
196 struct rt2880_pmx_group *mux = p->groups;
197 int i, j, c = 0;
198
199
200 while (mux->name) {
201 p->group_count++;
202 mux++;
203 }
204
205
206 p->group_names = devm_kcalloc(p->dev, p->group_count,
207 sizeof(char *), GFP_KERNEL);
208 if (!p->group_names)
209 return -ENOMEM;
210
211 for (i = 0; i < p->group_count; i++) {
212 p->group_names[i] = p->groups[i].name;
213 p->func_count += p->groups[i].func_count;
214 }
215
216
217 p->func_count++;
218
219
220 p->func = devm_kcalloc(p->dev, p->func_count,
221 sizeof(*p->func), GFP_KERNEL);
222 gpio_func.groups = devm_kcalloc(p->dev, p->group_count, sizeof(int),
223 GFP_KERNEL);
224 if (!p->func || !gpio_func.groups)
225 return -ENOMEM;
226
227
228 gpio_func.group_count = p->group_count;
229 for (i = 0; i < gpio_func.group_count; i++)
230 gpio_func.groups[i] = i;
231
232 p->func[c] = &gpio_func;
233 c++;
234
235
236 for (i = 0; i < p->group_count; i++) {
237 for (j = 0; j < p->groups[i].func_count; j++) {
238 p->func[c] = &p->groups[i].func[j];
239 p->func[c]->groups = devm_kzalloc(p->dev, sizeof(int),
240 GFP_KERNEL);
241 if (!p->func[c]->groups)
242 return -ENOMEM;
243 p->func[c]->groups[0] = i;
244 p->func[c]->group_count = 1;
245 c++;
246 }
247 }
248 return 0;
249}
250
251static int rt2880_pinmux_pins(struct rt2880_priv *p)
252{
253 int i, j;
254
255
256
257
258
259 for (i = 0; i < p->func_count; i++) {
260 int pin;
261
262 if (!p->func[i]->pin_count)
263 continue;
264
265 p->func[i]->pins = devm_kcalloc(p->dev,
266 p->func[i]->pin_count,
267 sizeof(int),
268 GFP_KERNEL);
269 for (j = 0; j < p->func[i]->pin_count; j++)
270 p->func[i]->pins[j] = p->func[i]->pin_first + j;
271
272 pin = p->func[i]->pin_first + p->func[i]->pin_count;
273 if (pin > p->max_pins)
274 p->max_pins = pin;
275 }
276
277
278 p->gpio = devm_kcalloc(p->dev, p->max_pins, sizeof(u8), GFP_KERNEL);
279
280 p->pads = devm_kcalloc(p->dev, p->max_pins,
281 sizeof(struct pinctrl_pin_desc), GFP_KERNEL);
282 if (!p->pads || !p->gpio)
283 return -ENOMEM;
284
285 memset(p->gpio, 1, sizeof(u8) * p->max_pins);
286 for (i = 0; i < p->func_count; i++) {
287 if (!p->func[i]->pin_count)
288 continue;
289
290 for (j = 0; j < p->func[i]->pin_count; j++)
291 p->gpio[p->func[i]->pins[j]] = 0;
292 }
293
294
295 p->gpio[0] = 1;
296
297
298 for (i = 0; i < p->max_pins; i++) {
299
300 char *name = devm_kzalloc(p->dev, 5, GFP_KERNEL);
301
302 if (!name)
303 return -ENOMEM;
304 snprintf(name, 5, "io%d", i);
305 p->pads[i].number = i;
306 p->pads[i].name = name;
307 }
308 p->desc->pins = p->pads;
309 p->desc->npins = p->max_pins;
310
311 return 0;
312}
313
314int rt2880_pinmux_init(struct platform_device *pdev,
315 struct rt2880_pmx_group *data)
316{
317 struct rt2880_priv *p;
318 struct pinctrl_dev *dev;
319 int err;
320
321 if (!data)
322 return -ENOTSUPP;
323
324
325 p = devm_kzalloc(&pdev->dev, sizeof(struct rt2880_priv), GFP_KERNEL);
326 if (!p)
327 return -ENOMEM;
328
329 p->dev = &pdev->dev;
330 p->desc = &rt2880_pctrl_desc;
331 p->groups = data;
332 platform_set_drvdata(pdev, p);
333
334
335 err = rt2880_pinmux_index(p);
336 if (err) {
337 dev_err(&pdev->dev, "failed to load index\n");
338 return err;
339 }
340
341 err = rt2880_pinmux_pins(p);
342 if (err) {
343 dev_err(&pdev->dev, "failed to load pins\n");
344 return err;
345 }
346 dev = pinctrl_register(p->desc, &pdev->dev, p);
347
348 return PTR_ERR_OR_ZERO(dev);
349}
350