1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16#include <linux/err.h>
17#include <linux/module.h>
18#include <linux/of.h>
19#include <linux/of_address.h>
20#include <linux/of_gpio.h>
21#include <linux/pinctrl/machine.h>
22#include <linux/pinctrl/pinctrl.h>
23#include <linux/pinctrl/pinmux.h>
24#include <linux/platform_device.h>
25#include <linux/slab.h>
26
27#include "pinctrl-spear.h"
28
29#define DRIVER_NAME "spear-pinmux"
30
31static void muxregs_endisable(struct spear_pmx *pmx,
32 struct spear_muxreg *muxregs, u8 count, bool enable)
33{
34 struct spear_muxreg *muxreg;
35 u32 val, temp, j;
36
37 for (j = 0; j < count; j++) {
38 muxreg = &muxregs[j];
39
40 val = pmx_readl(pmx, muxreg->reg);
41 val &= ~muxreg->mask;
42
43 if (enable)
44 temp = muxreg->val;
45 else
46 temp = ~muxreg->val;
47
48 val |= muxreg->mask & temp;
49 pmx_writel(pmx, val, muxreg->reg);
50 }
51}
52
53static int set_mode(struct spear_pmx *pmx, int mode)
54{
55 struct spear_pmx_mode *pmx_mode = NULL;
56 int i;
57 u32 val;
58
59 if (!pmx->machdata->pmx_modes || !pmx->machdata->npmx_modes)
60 return -EINVAL;
61
62 for (i = 0; i < pmx->machdata->npmx_modes; i++) {
63 if (pmx->machdata->pmx_modes[i]->mode == (1 << mode)) {
64 pmx_mode = pmx->machdata->pmx_modes[i];
65 break;
66 }
67 }
68
69 if (!pmx_mode)
70 return -EINVAL;
71
72 val = pmx_readl(pmx, pmx_mode->reg);
73 val &= ~pmx_mode->mask;
74 val |= pmx_mode->val;
75 pmx_writel(pmx, val, pmx_mode->reg);
76
77 pmx->machdata->mode = pmx_mode->mode;
78 dev_info(pmx->dev, "Configured Mode: %s with id: %x\n\n",
79 pmx_mode->name ? pmx_mode->name : "no_name",
80 pmx_mode->reg);
81
82 return 0;
83}
84
85void pmx_init_gpio_pingroup_addr(struct spear_gpio_pingroup *gpio_pingroup,
86 unsigned count, u16 reg)
87{
88 int i, j;
89
90 for (i = 0; i < count; i++)
91 for (j = 0; j < gpio_pingroup[i].nmuxregs; j++)
92 gpio_pingroup[i].muxregs[j].reg = reg;
93}
94
95void pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg)
96{
97 struct spear_pingroup *pgroup;
98 struct spear_modemux *modemux;
99 int i, j, group;
100
101 for (group = 0; group < machdata->ngroups; group++) {
102 pgroup = machdata->groups[group];
103
104 for (i = 0; i < pgroup->nmodemuxs; i++) {
105 modemux = &pgroup->modemuxs[i];
106
107 for (j = 0; j < modemux->nmuxregs; j++)
108 if (modemux->muxregs[j].reg == 0xFFFF)
109 modemux->muxregs[j].reg = reg;
110 }
111 }
112}
113
114static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev)
115{
116 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
117
118 return pmx->machdata->ngroups;
119}
120
121static const char *spear_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
122 unsigned group)
123{
124 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
125
126 return pmx->machdata->groups[group]->name;
127}
128
129static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
130 unsigned group, const unsigned **pins, unsigned *num_pins)
131{
132 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
133
134 *pins = pmx->machdata->groups[group]->pins;
135 *num_pins = pmx->machdata->groups[group]->npins;
136
137 return 0;
138}
139
140static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
141 struct seq_file *s, unsigned offset)
142{
143 seq_printf(s, " " DRIVER_NAME);
144}
145
146static int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
147 struct device_node *np_config,
148 struct pinctrl_map **map,
149 unsigned *num_maps)
150{
151 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
152 struct device_node *np;
153 struct property *prop;
154 const char *function, *group;
155 int ret, index = 0, count = 0;
156
157
158 for_each_child_of_node(np_config, np) {
159 ret = of_property_read_string(np, "st,function", &function);
160 if (ret < 0)
161 return ret;
162
163 ret = of_property_count_strings(np, "st,pins");
164 if (ret < 0)
165 return ret;
166
167 count += ret;
168 }
169
170 if (!count) {
171 dev_err(pmx->dev, "No child nodes passed via DT\n");
172 return -ENODEV;
173 }
174
175 *map = kzalloc(sizeof(**map) * count, GFP_KERNEL);
176 if (!*map)
177 return -ENOMEM;
178
179 for_each_child_of_node(np_config, np) {
180 of_property_read_string(np, "st,function", &function);
181 of_property_for_each_string(np, "st,pins", prop, group) {
182 (*map)[index].type = PIN_MAP_TYPE_MUX_GROUP;
183 (*map)[index].data.mux.group = group;
184 (*map)[index].data.mux.function = function;
185 index++;
186 }
187 }
188
189 *num_maps = count;
190
191 return 0;
192}
193
194static void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
195 struct pinctrl_map *map,
196 unsigned num_maps)
197{
198 kfree(map);
199}
200
201static const struct pinctrl_ops spear_pinctrl_ops = {
202 .get_groups_count = spear_pinctrl_get_groups_cnt,
203 .get_group_name = spear_pinctrl_get_group_name,
204 .get_group_pins = spear_pinctrl_get_group_pins,
205 .pin_dbg_show = spear_pinctrl_pin_dbg_show,
206 .dt_node_to_map = spear_pinctrl_dt_node_to_map,
207 .dt_free_map = spear_pinctrl_dt_free_map,
208};
209
210static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
211{
212 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
213
214 return pmx->machdata->nfunctions;
215}
216
217static const char *spear_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
218 unsigned function)
219{
220 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
221
222 return pmx->machdata->functions[function]->name;
223}
224
225static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
226 unsigned function, const char *const **groups,
227 unsigned * const ngroups)
228{
229 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
230
231 *groups = pmx->machdata->functions[function]->groups;
232 *ngroups = pmx->machdata->functions[function]->ngroups;
233
234 return 0;
235}
236
237static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev,
238 unsigned function, unsigned group, bool enable)
239{
240 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
241 const struct spear_pingroup *pgroup;
242 const struct spear_modemux *modemux;
243 int i;
244 bool found = false;
245
246 pgroup = pmx->machdata->groups[group];
247
248 for (i = 0; i < pgroup->nmodemuxs; i++) {
249 modemux = &pgroup->modemuxs[i];
250
251
252 if (pmx->machdata->modes_supported) {
253 if (!(pmx->machdata->mode & modemux->modes))
254 continue;
255 }
256
257 found = true;
258 muxregs_endisable(pmx, modemux->muxregs, modemux->nmuxregs,
259 enable);
260 }
261
262 if (!found) {
263 dev_err(pmx->dev, "pinmux group: %s not supported\n",
264 pgroup->name);
265 return -ENODEV;
266 }
267
268 return 0;
269}
270
271static int spear_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned function,
272 unsigned group)
273{
274 return spear_pinctrl_endisable(pctldev, function, group, true);
275}
276
277static void spear_pinctrl_disable(struct pinctrl_dev *pctldev,
278 unsigned function, unsigned group)
279{
280 spear_pinctrl_endisable(pctldev, function, group, false);
281}
282
283
284static struct spear_gpio_pingroup *get_gpio_pingroup(struct spear_pmx *pmx,
285 unsigned pin)
286{
287 struct spear_gpio_pingroup *gpio_pingroup;
288 int i, j;
289
290 if (!pmx->machdata->gpio_pingroups)
291 return NULL;
292
293 for (i = 0; i < pmx->machdata->ngpio_pingroups; i++) {
294 gpio_pingroup = &pmx->machdata->gpio_pingroups[i];
295
296 for (j = 0; j < gpio_pingroup->npins; j++) {
297 if (gpio_pingroup->pins[j] == pin)
298 return gpio_pingroup;
299 }
300 }
301
302 return NULL;
303}
304
305static int gpio_request_endisable(struct pinctrl_dev *pctldev,
306 struct pinctrl_gpio_range *range, unsigned offset, bool enable)
307{
308 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
309 struct spear_pinctrl_machdata *machdata = pmx->machdata;
310 struct spear_gpio_pingroup *gpio_pingroup;
311
312
313
314
315
316 gpio_pingroup = get_gpio_pingroup(pmx, offset);
317 if (gpio_pingroup)
318 muxregs_endisable(pmx, gpio_pingroup->muxregs,
319 gpio_pingroup->nmuxregs, enable);
320
321
322
323
324
325 if (machdata->gpio_request_endisable)
326 machdata->gpio_request_endisable(pmx, offset, enable);
327
328 return 0;
329}
330
331static int gpio_request_enable(struct pinctrl_dev *pctldev,
332 struct pinctrl_gpio_range *range, unsigned offset)
333{
334 return gpio_request_endisable(pctldev, range, offset, true);
335}
336
337static void gpio_disable_free(struct pinctrl_dev *pctldev,
338 struct pinctrl_gpio_range *range, unsigned offset)
339{
340 gpio_request_endisable(pctldev, range, offset, false);
341}
342
343static const struct pinmux_ops spear_pinmux_ops = {
344 .get_functions_count = spear_pinctrl_get_funcs_count,
345 .get_function_name = spear_pinctrl_get_func_name,
346 .get_function_groups = spear_pinctrl_get_func_groups,
347 .enable = spear_pinctrl_enable,
348 .disable = spear_pinctrl_disable,
349 .gpio_request_enable = gpio_request_enable,
350 .gpio_disable_free = gpio_disable_free,
351};
352
353static struct pinctrl_desc spear_pinctrl_desc = {
354 .name = DRIVER_NAME,
355 .pctlops = &spear_pinctrl_ops,
356 .pmxops = &spear_pinmux_ops,
357 .owner = THIS_MODULE,
358};
359
360int spear_pinctrl_probe(struct platform_device *pdev,
361 struct spear_pinctrl_machdata *machdata)
362{
363 struct device_node *np = pdev->dev.of_node;
364 struct resource *res;
365 struct spear_pmx *pmx;
366
367 if (!machdata)
368 return -ENODEV;
369
370 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
371 if (!res)
372 return -EINVAL;
373
374 pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
375 if (!pmx) {
376 dev_err(&pdev->dev, "Can't alloc spear_pmx\n");
377 return -ENOMEM;
378 }
379
380 pmx->vbase = devm_ioremap(&pdev->dev, res->start, resource_size(res));
381 if (!pmx->vbase) {
382 dev_err(&pdev->dev, "Couldn't ioremap at index 0\n");
383 return -ENODEV;
384 }
385
386 pmx->dev = &pdev->dev;
387 pmx->machdata = machdata;
388
389
390 if (machdata->modes_supported) {
391 int mode = 0;
392
393 if (of_property_read_u32(np, "st,pinmux-mode", &mode)) {
394 dev_err(&pdev->dev, "OF: pinmux mode not passed\n");
395 return -EINVAL;
396 }
397
398 if (set_mode(pmx, mode)) {
399 dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n",
400 mode);
401 return -EINVAL;
402 }
403 }
404
405 platform_set_drvdata(pdev, pmx);
406
407 spear_pinctrl_desc.pins = machdata->pins;
408 spear_pinctrl_desc.npins = machdata->npins;
409
410 pmx->pctl = pinctrl_register(&spear_pinctrl_desc, &pdev->dev, pmx);
411 if (!pmx->pctl) {
412 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
413 return -ENODEV;
414 }
415
416 return 0;
417}
418
419int spear_pinctrl_remove(struct platform_device *pdev)
420{
421 struct spear_pmx *pmx = platform_get_drvdata(pdev);
422
423 pinctrl_unregister(pmx->pctl);
424
425 return 0;
426}
427
