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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 of_node_put(np);
162 return ret;
163 }
164
165 ret = of_property_count_strings(np, "st,pins");
166 if (ret < 0) {
167 of_node_put(np);
168 return ret;
169 }
170
171 count += ret;
172 }
173
174 if (!count) {
175 dev_err(pmx->dev, "No child nodes passed via DT\n");
176 return -ENODEV;
177 }
178
179 *map = kcalloc(count, sizeof(**map), GFP_KERNEL);
180 if (!*map)
181 return -ENOMEM;
182
183 for_each_child_of_node(np_config, np) {
184 of_property_read_string(np, "st,function", &function);
185 of_property_for_each_string(np, "st,pins", prop, group) {
186 (*map)[index].type = PIN_MAP_TYPE_MUX_GROUP;
187 (*map)[index].data.mux.group = group;
188 (*map)[index].data.mux.function = function;
189 index++;
190 }
191 }
192
193 *num_maps = count;
194
195 return 0;
196}
197
198static void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
199 struct pinctrl_map *map,
200 unsigned num_maps)
201{
202 kfree(map);
203}
204
205static const struct pinctrl_ops spear_pinctrl_ops = {
206 .get_groups_count = spear_pinctrl_get_groups_cnt,
207 .get_group_name = spear_pinctrl_get_group_name,
208 .get_group_pins = spear_pinctrl_get_group_pins,
209 .pin_dbg_show = spear_pinctrl_pin_dbg_show,
210 .dt_node_to_map = spear_pinctrl_dt_node_to_map,
211 .dt_free_map = spear_pinctrl_dt_free_map,
212};
213
214static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
215{
216 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
217
218 return pmx->machdata->nfunctions;
219}
220
221static const char *spear_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
222 unsigned function)
223{
224 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
225
226 return pmx->machdata->functions[function]->name;
227}
228
229static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
230 unsigned function, const char *const **groups,
231 unsigned * const ngroups)
232{
233 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
234
235 *groups = pmx->machdata->functions[function]->groups;
236 *ngroups = pmx->machdata->functions[function]->ngroups;
237
238 return 0;
239}
240
241static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev,
242 unsigned function, unsigned group, bool enable)
243{
244 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
245 const struct spear_pingroup *pgroup;
246 const struct spear_modemux *modemux;
247 int i;
248 bool found = false;
249
250 pgroup = pmx->machdata->groups[group];
251
252 for (i = 0; i < pgroup->nmodemuxs; i++) {
253 modemux = &pgroup->modemuxs[i];
254
255
256 if (pmx->machdata->modes_supported) {
257 if (!(pmx->machdata->mode & modemux->modes))
258 continue;
259 }
260
261 found = true;
262 muxregs_endisable(pmx, modemux->muxregs, modemux->nmuxregs,
263 enable);
264 }
265
266 if (!found) {
267 dev_err(pmx->dev, "pinmux group: %s not supported\n",
268 pgroup->name);
269 return -ENODEV;
270 }
271
272 return 0;
273}
274
275static int spear_pinctrl_set_mux(struct pinctrl_dev *pctldev, unsigned function,
276 unsigned group)
277{
278 return spear_pinctrl_endisable(pctldev, function, group, true);
279}
280
281
282static struct spear_gpio_pingroup *get_gpio_pingroup(struct spear_pmx *pmx,
283 unsigned pin)
284{
285 struct spear_gpio_pingroup *gpio_pingroup;
286 int i, j;
287
288 if (!pmx->machdata->gpio_pingroups)
289 return NULL;
290
291 for (i = 0; i < pmx->machdata->ngpio_pingroups; i++) {
292 gpio_pingroup = &pmx->machdata->gpio_pingroups[i];
293
294 for (j = 0; j < gpio_pingroup->npins; j++) {
295 if (gpio_pingroup->pins[j] == pin)
296 return gpio_pingroup;
297 }
298 }
299
300 return NULL;
301}
302
303static int gpio_request_endisable(struct pinctrl_dev *pctldev,
304 struct pinctrl_gpio_range *range, unsigned offset, bool enable)
305{
306 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
307 struct spear_pinctrl_machdata *machdata = pmx->machdata;
308 struct spear_gpio_pingroup *gpio_pingroup;
309
310
311
312
313
314 gpio_pingroup = get_gpio_pingroup(pmx, offset);
315 if (gpio_pingroup)
316 muxregs_endisable(pmx, gpio_pingroup->muxregs,
317 gpio_pingroup->nmuxregs, enable);
318
319
320
321
322
323 if (machdata->gpio_request_endisable)
324 machdata->gpio_request_endisable(pmx, offset, enable);
325
326 return 0;
327}
328
329static int gpio_request_enable(struct pinctrl_dev *pctldev,
330 struct pinctrl_gpio_range *range, unsigned offset)
331{
332 return gpio_request_endisable(pctldev, range, offset, true);
333}
334
335static void gpio_disable_free(struct pinctrl_dev *pctldev,
336 struct pinctrl_gpio_range *range, unsigned offset)
337{
338 gpio_request_endisable(pctldev, range, offset, false);
339}
340
341static const struct pinmux_ops spear_pinmux_ops = {
342 .get_functions_count = spear_pinctrl_get_funcs_count,
343 .get_function_name = spear_pinctrl_get_func_name,
344 .get_function_groups = spear_pinctrl_get_func_groups,
345 .set_mux = spear_pinctrl_set_mux,
346 .gpio_request_enable = gpio_request_enable,
347 .gpio_disable_free = gpio_disable_free,
348};
349
350static struct pinctrl_desc spear_pinctrl_desc = {
351 .name = DRIVER_NAME,
352 .pctlops = &spear_pinctrl_ops,
353 .pmxops = &spear_pinmux_ops,
354 .owner = THIS_MODULE,
355};
356
357int spear_pinctrl_probe(struct platform_device *pdev,
358 struct spear_pinctrl_machdata *machdata)
359{
360 struct device_node *np = pdev->dev.of_node;
361 struct spear_pmx *pmx;
362
363 if (!machdata)
364 return -ENODEV;
365
366 pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
367 if (!pmx)
368 return -ENOMEM;
369
370 pmx->vbase = devm_platform_ioremap_resource(pdev, 0);
371 if (IS_ERR(pmx->vbase))
372 return PTR_ERR(pmx->vbase);
373
374 pmx->dev = &pdev->dev;
375 pmx->machdata = machdata;
376
377
378 if (machdata->modes_supported) {
379 int mode = 0;
380
381 if (of_property_read_u32(np, "st,pinmux-mode", &mode)) {
382 dev_err(&pdev->dev, "OF: pinmux mode not passed\n");
383 return -EINVAL;
384 }
385
386 if (set_mode(pmx, mode)) {
387 dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n",
388 mode);
389 return -EINVAL;
390 }
391 }
392
393 platform_set_drvdata(pdev, pmx);
394
395 spear_pinctrl_desc.pins = machdata->pins;
396 spear_pinctrl_desc.npins = machdata->npins;
397
398 pmx->pctl = devm_pinctrl_register(&pdev->dev, &spear_pinctrl_desc, pmx);
399 if (IS_ERR(pmx->pctl)) {
400 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
401 return PTR_ERR(pmx->pctl);
402 }
403
404 return 0;
405}
406
