1 /*
2 * Copyright 2012 Freescale Semiconductor, Inc.
3 *
4 * The code contained herein is licensed under the GNU General Public
5 * License. You may obtain a copy of the GNU General Public License
6 * Version 2 or later at the following locations:
7 *
8 * http://www.opensource.org/licenses/gpl-license.html
9 * http://www.gnu.org/copyleft/gpl.html
10 */
11
12 #include <linux/err.h>
13 #include <linux/init.h>
14 #include <linux/io.h>
15 #include <linux/module.h>
16 #include <linux/of.h>
17 #include <linux/of_address.h>
18 #include <linux/pinctrl/machine.h>
19 #include <linux/pinctrl/pinconf.h>
20 #include <linux/pinctrl/pinctrl.h>
21 #include <linux/pinctrl/pinmux.h>
22 #include <linux/platform_device.h>
23 #include <linux/slab.h>
24 #include "core.h"
25 #include "pinctrl-mxs.h"
26
27 #define SUFFIX_LEN 4
28
29 struct mxs_pinctrl_data {
30 struct device *dev;
31 struct pinctrl_dev *pctl;
32 void __iomem *base;
33 struct mxs_pinctrl_soc_data *soc;
34 };
35
mxs_get_groups_count(struct pinctrl_dev * pctldev)36 static int mxs_get_groups_count(struct pinctrl_dev *pctldev)
37 {
38 struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
39
40 return d->soc->ngroups;
41 }
42
mxs_get_group_name(struct pinctrl_dev * pctldev,unsigned group)43 static const char *mxs_get_group_name(struct pinctrl_dev *pctldev,
44 unsigned group)
45 {
46 struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
47
48 return d->soc->groups[group].name;
49 }
50
mxs_get_group_pins(struct pinctrl_dev * pctldev,unsigned group,const unsigned ** pins,unsigned * num_pins)51 static int mxs_get_group_pins(struct pinctrl_dev *pctldev, unsigned group,
52 const unsigned **pins, unsigned *num_pins)
53 {
54 struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
55
56 *pins = d->soc->groups[group].pins;
57 *num_pins = d->soc->groups[group].npins;
58
59 return 0;
60 }
61
mxs_pin_dbg_show(struct pinctrl_dev * pctldev,struct seq_file * s,unsigned offset)62 static void mxs_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
63 unsigned offset)
64 {
65 seq_printf(s, " %s", dev_name(pctldev->dev));
66 }
67
mxs_dt_node_to_map(struct pinctrl_dev * pctldev,struct device_node * np,struct pinctrl_map ** map,unsigned * num_maps)68 static int mxs_dt_node_to_map(struct pinctrl_dev *pctldev,
69 struct device_node *np,
70 struct pinctrl_map **map, unsigned *num_maps)
71 {
72 struct pinctrl_map *new_map;
73 char *group = NULL;
74 unsigned new_num = 1;
75 unsigned long config = 0;
76 unsigned long *pconfig;
77 int length = strlen(np->name) + SUFFIX_LEN;
78 bool purecfg = false;
79 u32 val, reg;
80 int ret, i = 0;
81
82 /* Check for pin config node which has no 'reg' property */
83 if (of_property_read_u32(np, "reg", ®))
84 purecfg = true;
85
86 ret = of_property_read_u32(np, "fsl,drive-strength", &val);
87 if (!ret)
88 config = val | MA_PRESENT;
89 ret = of_property_read_u32(np, "fsl,voltage", &val);
90 if (!ret)
91 config |= val << VOL_SHIFT | VOL_PRESENT;
92 ret = of_property_read_u32(np, "fsl,pull-up", &val);
93 if (!ret)
94 config |= val << PULL_SHIFT | PULL_PRESENT;
95
96 /* Check for group node which has both mux and config settings */
97 if (!purecfg && config)
98 new_num = 2;
99
100 new_map = kzalloc(sizeof(*new_map) * new_num, GFP_KERNEL);
101 if (!new_map)
102 return -ENOMEM;
103
104 if (!purecfg) {
105 new_map[i].type = PIN_MAP_TYPE_MUX_GROUP;
106 new_map[i].data.mux.function = np->name;
107
108 /* Compose group name */
109 group = kzalloc(length, GFP_KERNEL);
110 if (!group) {
111 ret = -ENOMEM;
112 goto free;
113 }
114 snprintf(group, length, "%s.%d", np->name, reg);
115 new_map[i].data.mux.group = group;
116 i++;
117 }
118
119 if (config) {
120 pconfig = kmemdup(&config, sizeof(config), GFP_KERNEL);
121 if (!pconfig) {
122 ret = -ENOMEM;
123 goto free_group;
124 }
125
126 new_map[i].type = PIN_MAP_TYPE_CONFIGS_GROUP;
127 new_map[i].data.configs.group_or_pin = purecfg ? np->name :
128 group;
129 new_map[i].data.configs.configs = pconfig;
130 new_map[i].data.configs.num_configs = 1;
131 }
132
133 *map = new_map;
134 *num_maps = new_num;
135
136 return 0;
137
138 free_group:
139 if (!purecfg)
140 kfree(group);
141 free:
142 kfree(new_map);
143 return ret;
144 }
145
mxs_dt_free_map(struct pinctrl_dev * pctldev,struct pinctrl_map * map,unsigned num_maps)146 static void mxs_dt_free_map(struct pinctrl_dev *pctldev,
147 struct pinctrl_map *map, unsigned num_maps)
148 {
149 u32 i;
150
151 for (i = 0; i < num_maps; i++) {
152 if (map[i].type == PIN_MAP_TYPE_MUX_GROUP)
153 kfree(map[i].data.mux.group);
154 if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
155 kfree(map[i].data.configs.configs);
156 }
157
158 kfree(map);
159 }
160
161 static const struct pinctrl_ops mxs_pinctrl_ops = {
162 .get_groups_count = mxs_get_groups_count,
163 .get_group_name = mxs_get_group_name,
164 .get_group_pins = mxs_get_group_pins,
165 .pin_dbg_show = mxs_pin_dbg_show,
166 .dt_node_to_map = mxs_dt_node_to_map,
167 .dt_free_map = mxs_dt_free_map,
168 };
169
mxs_pinctrl_get_funcs_count(struct pinctrl_dev * pctldev)170 static int mxs_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
171 {
172 struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
173
174 return d->soc->nfunctions;
175 }
176
mxs_pinctrl_get_func_name(struct pinctrl_dev * pctldev,unsigned function)177 static const char *mxs_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
178 unsigned function)
179 {
180 struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
181
182 return d->soc->functions[function].name;
183 }
184
mxs_pinctrl_get_func_groups(struct pinctrl_dev * pctldev,unsigned group,const char * const ** groups,unsigned * const num_groups)185 static int mxs_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
186 unsigned group,
187 const char * const **groups,
188 unsigned * const num_groups)
189 {
190 struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
191
192 *groups = d->soc->functions[group].groups;
193 *num_groups = d->soc->functions[group].ngroups;
194
195 return 0;
196 }
197
mxs_pinctrl_enable(struct pinctrl_dev * pctldev,unsigned selector,unsigned group)198 static int mxs_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned selector,
199 unsigned group)
200 {
201 struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
202 struct mxs_group *g = &d->soc->groups[group];
203 void __iomem *reg;
204 u8 bank, shift;
205 u16 pin;
206 u32 i;
207
208 for (i = 0; i < g->npins; i++) {
209 bank = PINID_TO_BANK(g->pins[i]);
210 pin = PINID_TO_PIN(g->pins[i]);
211 reg = d->base + d->soc->regs->muxsel;
212 reg += bank * 0x20 + pin / 16 * 0x10;
213 shift = pin % 16 * 2;
214
215 writel(0x3 << shift, reg + CLR);
216 writel(g->muxsel[i] << shift, reg + SET);
217 }
218
219 return 0;
220 }
221
222 static const struct pinmux_ops mxs_pinmux_ops = {
223 .get_functions_count = mxs_pinctrl_get_funcs_count,
224 .get_function_name = mxs_pinctrl_get_func_name,
225 .get_function_groups = mxs_pinctrl_get_func_groups,
226 .enable = mxs_pinctrl_enable,
227 };
228
mxs_pinconf_get(struct pinctrl_dev * pctldev,unsigned pin,unsigned long * config)229 static int mxs_pinconf_get(struct pinctrl_dev *pctldev,
230 unsigned pin, unsigned long *config)
231 {
232 return -ENOTSUPP;
233 }
234
mxs_pinconf_set(struct pinctrl_dev * pctldev,unsigned pin,unsigned long config)235 static int mxs_pinconf_set(struct pinctrl_dev *pctldev,
236 unsigned pin, unsigned long config)
237 {
238 return -ENOTSUPP;
239 }
240
mxs_pinconf_group_get(struct pinctrl_dev * pctldev,unsigned group,unsigned long * config)241 static int mxs_pinconf_group_get(struct pinctrl_dev *pctldev,
242 unsigned group, unsigned long *config)
243 {
244 struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
245
246 *config = d->soc->groups[group].config;
247
248 return 0;
249 }
250
mxs_pinconf_group_set(struct pinctrl_dev * pctldev,unsigned group,unsigned long config)251 static int mxs_pinconf_group_set(struct pinctrl_dev *pctldev,
252 unsigned group, unsigned long config)
253 {
254 struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
255 struct mxs_group *g = &d->soc->groups[group];
256 void __iomem *reg;
257 u8 ma, vol, pull, bank, shift;
258 u16 pin;
259 u32 i;
260
261 ma = CONFIG_TO_MA(config);
262 vol = CONFIG_TO_VOL(config);
263 pull = CONFIG_TO_PULL(config);
264
265 for (i = 0; i < g->npins; i++) {
266 bank = PINID_TO_BANK(g->pins[i]);
267 pin = PINID_TO_PIN(g->pins[i]);
268
269 /* drive */
270 reg = d->base + d->soc->regs->drive;
271 reg += bank * 0x40 + pin / 8 * 0x10;
272
273 /* mA */
274 if (config & MA_PRESENT) {
275 shift = pin % 8 * 4;
276 writel(0x3 << shift, reg + CLR);
277 writel(ma << shift, reg + SET);
278 }
279
280 /* vol */
281 if (config & VOL_PRESENT) {
282 shift = pin % 8 * 4 + 2;
283 if (vol)
284 writel(1 << shift, reg + SET);
285 else
286 writel(1 << shift, reg + CLR);
287 }
288
289 /* pull */
290 if (config & PULL_PRESENT) {
291 reg = d->base + d->soc->regs->pull;
292 reg += bank * 0x10;
293 shift = pin;
294 if (pull)
295 writel(1 << shift, reg + SET);
296 else
297 writel(1 << shift, reg + CLR);
298 }
299 }
300
301 /* cache the config value for mxs_pinconf_group_get() */
302 g->config = config;
303
304 return 0;
305 }
306
mxs_pinconf_dbg_show(struct pinctrl_dev * pctldev,struct seq_file * s,unsigned pin)307 static void mxs_pinconf_dbg_show(struct pinctrl_dev *pctldev,
308 struct seq_file *s, unsigned pin)
309 {
310 /* Not support */
311 }
312
mxs_pinconf_group_dbg_show(struct pinctrl_dev * pctldev,struct seq_file * s,unsigned group)313 static void mxs_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
314 struct seq_file *s, unsigned group)
315 {
316 unsigned long config;
317
318 if (!mxs_pinconf_group_get(pctldev, group, &config))
319 seq_printf(s, "0x%lx", config);
320 }
321
322 static const struct pinconf_ops mxs_pinconf_ops = {
323 .pin_config_get = mxs_pinconf_get,
324 .pin_config_set = mxs_pinconf_set,
325 .pin_config_group_get = mxs_pinconf_group_get,
326 .pin_config_group_set = mxs_pinconf_group_set,
327 .pin_config_dbg_show = mxs_pinconf_dbg_show,
328 .pin_config_group_dbg_show = mxs_pinconf_group_dbg_show,
329 };
330
331 static struct pinctrl_desc mxs_pinctrl_desc = {
332 .pctlops = &mxs_pinctrl_ops,
333 .pmxops = &mxs_pinmux_ops,
334 .confops = &mxs_pinconf_ops,
335 .owner = THIS_MODULE,
336 };
337
mxs_pinctrl_parse_group(struct platform_device * pdev,struct device_node * np,int idx,const char ** out_name)338 static int mxs_pinctrl_parse_group(struct platform_device *pdev,
339 struct device_node *np, int idx,
340 const char **out_name)
341 {
342 struct mxs_pinctrl_data *d = platform_get_drvdata(pdev);
343 struct mxs_group *g = &d->soc->groups[idx];
344 struct property *prop;
345 const char *propname = "fsl,pinmux-ids";
346 char *group;
347 int length = strlen(np->name) + SUFFIX_LEN;
348 u32 val, i;
349
350 group = devm_kzalloc(&pdev->dev, length, GFP_KERNEL);
351 if (!group)
352 return -ENOMEM;
353 if (of_property_read_u32(np, "reg", &val))
354 snprintf(group, length, "%s", np->name);
355 else
356 snprintf(group, length, "%s.%d", np->name, val);
357 g->name = group;
358
359 prop = of_find_property(np, propname, &length);
360 if (!prop)
361 return -EINVAL;
362 g->npins = length / sizeof(u32);
363
364 g->pins = devm_kzalloc(&pdev->dev, g->npins * sizeof(*g->pins),
365 GFP_KERNEL);
366 if (!g->pins)
367 return -ENOMEM;
368
369 g->muxsel = devm_kzalloc(&pdev->dev, g->npins * sizeof(*g->muxsel),
370 GFP_KERNEL);
371 if (!g->muxsel)
372 return -ENOMEM;
373
374 of_property_read_u32_array(np, propname, g->pins, g->npins);
375 for (i = 0; i < g->npins; i++) {
376 g->muxsel[i] = MUXID_TO_MUXSEL(g->pins[i]);
377 g->pins[i] = MUXID_TO_PINID(g->pins[i]);
378 }
379
380 if (out_name)
381 *out_name = g->name;
382
383 return 0;
384 }
385
mxs_pinctrl_probe_dt(struct platform_device * pdev,struct mxs_pinctrl_data * d)386 static int mxs_pinctrl_probe_dt(struct platform_device *pdev,
387 struct mxs_pinctrl_data *d)
388 {
389 struct mxs_pinctrl_soc_data *soc = d->soc;
390 struct device_node *np = pdev->dev.of_node;
391 struct device_node *child;
392 struct mxs_function *f;
393 const char *gpio_compat = "fsl,mxs-gpio";
394 const char *fn, *fnull = "";
395 int i = 0, idxf = 0, idxg = 0;
396 int ret;
397 u32 val;
398
399 child = of_get_next_child(np, NULL);
400 if (!child) {
401 dev_err(&pdev->dev, "no group is defined\n");
402 return -ENOENT;
403 }
404
405 /* Count total functions and groups */
406 fn = fnull;
407 for_each_child_of_node(np, child) {
408 if (of_device_is_compatible(child, gpio_compat))
409 continue;
410 soc->ngroups++;
411 /* Skip pure pinconf node */
412 if (of_property_read_u32(child, "reg", &val))
413 continue;
414 if (strcmp(fn, child->name)) {
415 fn = child->name;
416 soc->nfunctions++;
417 }
418 }
419
420 soc->functions = devm_kzalloc(&pdev->dev, soc->nfunctions *
421 sizeof(*soc->functions), GFP_KERNEL);
422 if (!soc->functions)
423 return -ENOMEM;
424
425 soc->groups = devm_kzalloc(&pdev->dev, soc->ngroups *
426 sizeof(*soc->groups), GFP_KERNEL);
427 if (!soc->groups)
428 return -ENOMEM;
429
430 /* Count groups for each function */
431 fn = fnull;
432 f = &soc->functions[idxf];
433 for_each_child_of_node(np, child) {
434 if (of_device_is_compatible(child, gpio_compat))
435 continue;
436 if (of_property_read_u32(child, "reg", &val))
437 continue;
438 if (strcmp(fn, child->name)) {
439 f = &soc->functions[idxf++];
440 f->name = fn = child->name;
441 }
442 f->ngroups++;
443 };
444
445 /* Get groups for each function */
446 idxf = 0;
447 fn = fnull;
448 for_each_child_of_node(np, child) {
449 if (of_device_is_compatible(child, gpio_compat))
450 continue;
451 if (of_property_read_u32(child, "reg", &val)) {
452 ret = mxs_pinctrl_parse_group(pdev, child,
453 idxg++, NULL);
454 if (ret)
455 return ret;
456 continue;
457 }
458
459 if (strcmp(fn, child->name)) {
460 f = &soc->functions[idxf++];
461 f->groups = devm_kzalloc(&pdev->dev, f->ngroups *
462 sizeof(*f->groups),
463 GFP_KERNEL);
464 if (!f->groups)
465 return -ENOMEM;
466 fn = child->name;
467 i = 0;
468 }
469 ret = mxs_pinctrl_parse_group(pdev, child, idxg++,
470 &f->groups[i++]);
471 if (ret)
472 return ret;
473 }
474
475 return 0;
476 }
477
mxs_pinctrl_probe(struct platform_device * pdev,struct mxs_pinctrl_soc_data * soc)478 int mxs_pinctrl_probe(struct platform_device *pdev,
479 struct mxs_pinctrl_soc_data *soc)
480 {
481 struct device_node *np = pdev->dev.of_node;
482 struct mxs_pinctrl_data *d;
483 int ret;
484
485 d = devm_kzalloc(&pdev->dev, sizeof(*d), GFP_KERNEL);
486 if (!d)
487 return -ENOMEM;
488
489 d->dev = &pdev->dev;
490 d->soc = soc;
491
492 d->base = of_iomap(np, 0);
493 if (!d->base)
494 return -EADDRNOTAVAIL;
495
496 mxs_pinctrl_desc.pins = d->soc->pins;
497 mxs_pinctrl_desc.npins = d->soc->npins;
498 mxs_pinctrl_desc.name = dev_name(&pdev->dev);
499
500 platform_set_drvdata(pdev, d);
501
502 ret = mxs_pinctrl_probe_dt(pdev, d);
503 if (ret) {
504 dev_err(&pdev->dev, "dt probe failed: %d\n", ret);
505 goto err;
506 }
507
508 d->pctl = pinctrl_register(&mxs_pinctrl_desc, &pdev->dev, d);
509 if (!d->pctl) {
510 dev_err(&pdev->dev, "Couldn't register MXS pinctrl driver\n");
511 ret = -EINVAL;
512 goto err;
513 }
514
515 return 0;
516
517 err:
518 platform_set_drvdata(pdev, NULL);
519 iounmap(d->base);
520 return ret;
521 }
522 EXPORT_SYMBOL_GPL(mxs_pinctrl_probe);
523
mxs_pinctrl_remove(struct platform_device * pdev)524 int mxs_pinctrl_remove(struct platform_device *pdev)
525 {
526 struct mxs_pinctrl_data *d = platform_get_drvdata(pdev);
527
528 platform_set_drvdata(pdev, NULL);
529 pinctrl_unregister(d->pctl);
530 iounmap(d->base);
531
532 return 0;
533 }
534 EXPORT_SYMBOL_GPL(mxs_pinctrl_remove);
535