Loading...
Note: File does not exist in v6.8.
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
29struct 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
36static 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
43static 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
51static 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
62static 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
68static 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
138free_group:
139 if (!purecfg)
140 kfree(group);
141free:
142 kfree(new_map);
143 return ret;
144}
145
146static 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
161static 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
170static 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
177static 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
185static 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
198static 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
222static 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
229static int mxs_pinconf_get(struct pinctrl_dev *pctldev,
230 unsigned pin, unsigned long *config)
231{
232 return -ENOTSUPP;
233}
234
235static int mxs_pinconf_set(struct pinctrl_dev *pctldev,
236 unsigned pin, unsigned long *configs,
237 unsigned num_configs)
238{
239 return -ENOTSUPP;
240}
241
242static int mxs_pinconf_group_get(struct pinctrl_dev *pctldev,
243 unsigned group, unsigned long *config)
244{
245 struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
246
247 *config = d->soc->groups[group].config;
248
249 return 0;
250}
251
252static int mxs_pinconf_group_set(struct pinctrl_dev *pctldev,
253 unsigned group, unsigned long *configs,
254 unsigned num_configs)
255{
256 struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev);
257 struct mxs_group *g = &d->soc->groups[group];
258 void __iomem *reg;
259 u8 ma, vol, pull, bank, shift;
260 u16 pin;
261 u32 i;
262 int n;
263 unsigned long config;
264
265 for (n = 0; n < num_configs; n++) {
266 config = configs[n];
267
268 ma = CONFIG_TO_MA(config);
269 vol = CONFIG_TO_VOL(config);
270 pull = CONFIG_TO_PULL(config);
271
272 for (i = 0; i < g->npins; i++) {
273 bank = PINID_TO_BANK(g->pins[i]);
274 pin = PINID_TO_PIN(g->pins[i]);
275
276 /* drive */
277 reg = d->base + d->soc->regs->drive;
278 reg += bank * 0x40 + pin / 8 * 0x10;
279
280 /* mA */
281 if (config & MA_PRESENT) {
282 shift = pin % 8 * 4;
283 writel(0x3 << shift, reg + CLR);
284 writel(ma << shift, reg + SET);
285 }
286
287 /* vol */
288 if (config & VOL_PRESENT) {
289 shift = pin % 8 * 4 + 2;
290 if (vol)
291 writel(1 << shift, reg + SET);
292 else
293 writel(1 << shift, reg + CLR);
294 }
295
296 /* pull */
297 if (config & PULL_PRESENT) {
298 reg = d->base + d->soc->regs->pull;
299 reg += bank * 0x10;
300 shift = pin;
301 if (pull)
302 writel(1 << shift, reg + SET);
303 else
304 writel(1 << shift, reg + CLR);
305 }
306 }
307
308 /* cache the config value for mxs_pinconf_group_get() */
309 g->config = config;
310
311 } /* for each config */
312
313 return 0;
314}
315
316static void mxs_pinconf_dbg_show(struct pinctrl_dev *pctldev,
317 struct seq_file *s, unsigned pin)
318{
319 /* Not support */
320}
321
322static void mxs_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
323 struct seq_file *s, unsigned group)
324{
325 unsigned long config;
326
327 if (!mxs_pinconf_group_get(pctldev, group, &config))
328 seq_printf(s, "0x%lx", config);
329}
330
331static const struct pinconf_ops mxs_pinconf_ops = {
332 .pin_config_get = mxs_pinconf_get,
333 .pin_config_set = mxs_pinconf_set,
334 .pin_config_group_get = mxs_pinconf_group_get,
335 .pin_config_group_set = mxs_pinconf_group_set,
336 .pin_config_dbg_show = mxs_pinconf_dbg_show,
337 .pin_config_group_dbg_show = mxs_pinconf_group_dbg_show,
338};
339
340static struct pinctrl_desc mxs_pinctrl_desc = {
341 .pctlops = &mxs_pinctrl_ops,
342 .pmxops = &mxs_pinmux_ops,
343 .confops = &mxs_pinconf_ops,
344 .owner = THIS_MODULE,
345};
346
347static int mxs_pinctrl_parse_group(struct platform_device *pdev,
348 struct device_node *np, int idx,
349 const char **out_name)
350{
351 struct mxs_pinctrl_data *d = platform_get_drvdata(pdev);
352 struct mxs_group *g = &d->soc->groups[idx];
353 struct property *prop;
354 const char *propname = "fsl,pinmux-ids";
355 char *group;
356 int length = strlen(np->name) + SUFFIX_LEN;
357 u32 val, i;
358
359 group = devm_kzalloc(&pdev->dev, length, GFP_KERNEL);
360 if (!group)
361 return -ENOMEM;
362 if (of_property_read_u32(np, "reg", &val))
363 snprintf(group, length, "%s", np->name);
364 else
365 snprintf(group, length, "%s.%d", np->name, val);
366 g->name = group;
367
368 prop = of_find_property(np, propname, &length);
369 if (!prop)
370 return -EINVAL;
371 g->npins = length / sizeof(u32);
372
373 g->pins = devm_kzalloc(&pdev->dev, g->npins * sizeof(*g->pins),
374 GFP_KERNEL);
375 if (!g->pins)
376 return -ENOMEM;
377
378 g->muxsel = devm_kzalloc(&pdev->dev, g->npins * sizeof(*g->muxsel),
379 GFP_KERNEL);
380 if (!g->muxsel)
381 return -ENOMEM;
382
383 of_property_read_u32_array(np, propname, g->pins, g->npins);
384 for (i = 0; i < g->npins; i++) {
385 g->muxsel[i] = MUXID_TO_MUXSEL(g->pins[i]);
386 g->pins[i] = MUXID_TO_PINID(g->pins[i]);
387 }
388
389 if (out_name)
390 *out_name = g->name;
391
392 return 0;
393}
394
395static int mxs_pinctrl_probe_dt(struct platform_device *pdev,
396 struct mxs_pinctrl_data *d)
397{
398 struct mxs_pinctrl_soc_data *soc = d->soc;
399 struct device_node *np = pdev->dev.of_node;
400 struct device_node *child;
401 struct mxs_function *f;
402 const char *gpio_compat = "fsl,mxs-gpio";
403 const char *fn, *fnull = "";
404 int i = 0, idxf = 0, idxg = 0;
405 int ret;
406 u32 val;
407
408 child = of_get_next_child(np, NULL);
409 if (!child) {
410 dev_err(&pdev->dev, "no group is defined\n");
411 return -ENOENT;
412 }
413
414 /* Count total functions and groups */
415 fn = fnull;
416 for_each_child_of_node(np, child) {
417 if (of_device_is_compatible(child, gpio_compat))
418 continue;
419 soc->ngroups++;
420 /* Skip pure pinconf node */
421 if (of_property_read_u32(child, "reg", &val))
422 continue;
423 if (strcmp(fn, child->name)) {
424 fn = child->name;
425 soc->nfunctions++;
426 }
427 }
428
429 soc->functions = devm_kzalloc(&pdev->dev, soc->nfunctions *
430 sizeof(*soc->functions), GFP_KERNEL);
431 if (!soc->functions)
432 return -ENOMEM;
433
434 soc->groups = devm_kzalloc(&pdev->dev, soc->ngroups *
435 sizeof(*soc->groups), GFP_KERNEL);
436 if (!soc->groups)
437 return -ENOMEM;
438
439 /* Count groups for each function */
440 fn = fnull;
441 f = &soc->functions[idxf];
442 for_each_child_of_node(np, child) {
443 if (of_device_is_compatible(child, gpio_compat))
444 continue;
445 if (of_property_read_u32(child, "reg", &val))
446 continue;
447 if (strcmp(fn, child->name)) {
448 f = &soc->functions[idxf++];
449 f->name = fn = child->name;
450 }
451 f->ngroups++;
452 };
453
454 /* Get groups for each function */
455 idxf = 0;
456 fn = fnull;
457 for_each_child_of_node(np, child) {
458 if (of_device_is_compatible(child, gpio_compat))
459 continue;
460 if (of_property_read_u32(child, "reg", &val)) {
461 ret = mxs_pinctrl_parse_group(pdev, child,
462 idxg++, NULL);
463 if (ret)
464 return ret;
465 continue;
466 }
467
468 if (strcmp(fn, child->name)) {
469 f = &soc->functions[idxf++];
470 f->groups = devm_kzalloc(&pdev->dev, f->ngroups *
471 sizeof(*f->groups),
472 GFP_KERNEL);
473 if (!f->groups)
474 return -ENOMEM;
475 fn = child->name;
476 i = 0;
477 }
478 ret = mxs_pinctrl_parse_group(pdev, child, idxg++,
479 &f->groups[i++]);
480 if (ret)
481 return ret;
482 }
483
484 return 0;
485}
486
487int mxs_pinctrl_probe(struct platform_device *pdev,
488 struct mxs_pinctrl_soc_data *soc)
489{
490 struct device_node *np = pdev->dev.of_node;
491 struct mxs_pinctrl_data *d;
492 int ret;
493
494 d = devm_kzalloc(&pdev->dev, sizeof(*d), GFP_KERNEL);
495 if (!d)
496 return -ENOMEM;
497
498 d->dev = &pdev->dev;
499 d->soc = soc;
500
501 d->base = of_iomap(np, 0);
502 if (!d->base)
503 return -EADDRNOTAVAIL;
504
505 mxs_pinctrl_desc.pins = d->soc->pins;
506 mxs_pinctrl_desc.npins = d->soc->npins;
507 mxs_pinctrl_desc.name = dev_name(&pdev->dev);
508
509 platform_set_drvdata(pdev, d);
510
511 ret = mxs_pinctrl_probe_dt(pdev, d);
512 if (ret) {
513 dev_err(&pdev->dev, "dt probe failed: %d\n", ret);
514 goto err;
515 }
516
517 d->pctl = pinctrl_register(&mxs_pinctrl_desc, &pdev->dev, d);
518 if (!d->pctl) {
519 dev_err(&pdev->dev, "Couldn't register MXS pinctrl driver\n");
520 ret = -EINVAL;
521 goto err;
522 }
523
524 return 0;
525
526err:
527 iounmap(d->base);
528 return ret;
529}
530EXPORT_SYMBOL_GPL(mxs_pinctrl_probe);
531
532int mxs_pinctrl_remove(struct platform_device *pdev)
533{
534 struct mxs_pinctrl_data *d = platform_get_drvdata(pdev);
535
536 pinctrl_unregister(d->pctl);
537 iounmap(d->base);
538
539 return 0;
540}
541EXPORT_SYMBOL_GPL(mxs_pinctrl_remove);