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8#include <linux/bitops.h>
9#include <linux/io.h>
10#include <linux/of.h>
11#include <linux/of_address.h>
12#include <linux/module.h>
13#include <linux/pinctrl/machine.h>
14#include <linux/pinctrl/pinconf.h>
15#include <linux/pinctrl/pinconf-generic.h>
16#include <linux/pinctrl/pinmux.h>
17#include <linux/pinctrl/pinctrl.h>
18#include <linux/platform_device.h>
19#include <linux/slab.h>
20
21#include "../pinctrl-utils.h"
22#include "pinctrl-pxa2xx.h"
23
24static int pxa2xx_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
25{
26 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
27
28 return pctl->ngroups;
29}
30
31static const char *pxa2xx_pctrl_get_group_name(struct pinctrl_dev *pctldev,
32 unsigned tgroup)
33{
34 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
35 struct pxa_pinctrl_group *group = pctl->groups + tgroup;
36
37 return group->name;
38}
39
40static int pxa2xx_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
41 unsigned tgroup,
42 const unsigned **pins,
43 unsigned *num_pins)
44{
45 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
46 struct pxa_pinctrl_group *group = pctl->groups + tgroup;
47
48 *pins = (unsigned *)&group->pin;
49 *num_pins = 1;
50
51 return 0;
52}
53
54static const struct pinctrl_ops pxa2xx_pctl_ops = {
55#ifdef CONFIG_OF
56 .dt_node_to_map = pinconf_generic_dt_node_to_map_all,
57 .dt_free_map = pinctrl_utils_free_map,
58#endif
59 .get_groups_count = pxa2xx_pctrl_get_groups_count,
60 .get_group_name = pxa2xx_pctrl_get_group_name,
61 .get_group_pins = pxa2xx_pctrl_get_group_pins,
62};
63
64static struct pxa_desc_function *
65pxa_desc_by_func_group(struct pxa_pinctrl *pctl, const char *pin_name,
66 const char *func_name)
67{
68 int i;
69 struct pxa_desc_function *df;
70
71 for (i = 0; i < pctl->npins; i++) {
72 const struct pxa_desc_pin *pin = pctl->ppins + i;
73
74 if (!strcmp(pin->pin.name, pin_name))
75 for (df = pin->functions; df->name; df++)
76 if (!strcmp(df->name, func_name))
77 return df;
78 }
79
80 return NULL;
81}
82
83static int pxa2xx_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
84 struct pinctrl_gpio_range *range,
85 unsigned pin,
86 bool input)
87{
88 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
89 unsigned long flags;
90 uint32_t val;
91 void __iomem *gpdr;
92
93 gpdr = pctl->base_gpdr[pin / 32];
94 dev_dbg(pctl->dev, "set_direction(pin=%d): dir=%d\n",
95 pin, !input);
96
97 spin_lock_irqsave(&pctl->lock, flags);
98
99 val = readl_relaxed(gpdr);
100 val = (val & ~BIT(pin % 32)) | (input ? 0 : BIT(pin % 32));
101 writel_relaxed(val, gpdr);
102
103 spin_unlock_irqrestore(&pctl->lock, flags);
104
105 return 0;
106}
107
108static const char *pxa2xx_pmx_get_func_name(struct pinctrl_dev *pctldev,
109 unsigned function)
110{
111 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
112 struct pxa_pinctrl_function *pf = pctl->functions + function;
113
114 return pf->name;
115}
116
117static int pxa2xx_get_functions_count(struct pinctrl_dev *pctldev)
118{
119 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
120
121 return pctl->nfuncs;
122}
123
124static int pxa2xx_pmx_get_func_groups(struct pinctrl_dev *pctldev,
125 unsigned function,
126 const char * const **groups,
127 unsigned * const num_groups)
128{
129 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
130 struct pxa_pinctrl_function *pf = pctl->functions + function;
131
132 *groups = pf->groups;
133 *num_groups = pf->ngroups;
134
135 return 0;
136}
137
138static int pxa2xx_pmx_set_mux(struct pinctrl_dev *pctldev, unsigned function,
139 unsigned tgroup)
140{
141 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
142 struct pxa_pinctrl_group *group = pctl->groups + tgroup;
143 struct pxa_desc_function *df;
144 int pin, shift;
145 unsigned long flags;
146 void __iomem *gafr, *gpdr;
147 u32 val;
148
149
150 df = pxa_desc_by_func_group(pctl, group->name,
151 (pctl->functions + function)->name);
152 if (!df)
153 return -EINVAL;
154
155 pin = group->pin;
156 gafr = pctl->base_gafr[pin / 16];
157 gpdr = pctl->base_gpdr[pin / 32];
158 shift = (pin % 16) << 1;
159 dev_dbg(pctl->dev, "set_mux(pin=%d): af=%d dir=%d\n",
160 pin, df->muxval >> 1, df->muxval & 0x1);
161
162 spin_lock_irqsave(&pctl->lock, flags);
163
164 val = readl_relaxed(gafr);
165 val = (val & ~(0x3 << shift)) | ((df->muxval >> 1) << shift);
166 writel_relaxed(val, gafr);
167
168 val = readl_relaxed(gpdr);
169 val = (val & ~BIT(pin % 32)) | ((df->muxval & 1) ? BIT(pin % 32) : 0);
170 writel_relaxed(val, gpdr);
171
172 spin_unlock_irqrestore(&pctl->lock, flags);
173
174 return 0;
175}
176static const struct pinmux_ops pxa2xx_pinmux_ops = {
177 .get_functions_count = pxa2xx_get_functions_count,
178 .get_function_name = pxa2xx_pmx_get_func_name,
179 .get_function_groups = pxa2xx_pmx_get_func_groups,
180 .set_mux = pxa2xx_pmx_set_mux,
181 .gpio_set_direction = pxa2xx_pmx_gpio_set_direction,
182};
183
184static int pxa2xx_pconf_group_get(struct pinctrl_dev *pctldev,
185 unsigned group,
186 unsigned long *config)
187{
188 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
189 struct pxa_pinctrl_group *g = pctl->groups + group;
190 unsigned long flags;
191 unsigned pin = g->pin;
192 void __iomem *pgsr = pctl->base_pgsr[pin / 32];
193 u32 val;
194
195 spin_lock_irqsave(&pctl->lock, flags);
196 val = readl_relaxed(pgsr) & BIT(pin % 32);
197 *config = val ? PIN_CONFIG_MODE_LOW_POWER : 0;
198 spin_unlock_irqrestore(&pctl->lock, flags);
199
200 dev_dbg(pctl->dev, "get sleep gpio state(pin=%d) %d\n",
201 pin, !!val);
202 return 0;
203}
204
205static int pxa2xx_pconf_group_set(struct pinctrl_dev *pctldev,
206 unsigned group,
207 unsigned long *configs,
208 unsigned num_configs)
209{
210 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
211 struct pxa_pinctrl_group *g = pctl->groups + group;
212 unsigned long flags;
213 unsigned pin = g->pin;
214 void __iomem *pgsr = pctl->base_pgsr[pin / 32];
215 int i, is_set = 0;
216 u32 val;
217
218 for (i = 0; i < num_configs; i++) {
219 switch (pinconf_to_config_param(configs[i])) {
220 case PIN_CONFIG_MODE_LOW_POWER:
221 is_set = pinconf_to_config_argument(configs[i]);
222 break;
223 default:
224 return -EINVAL;
225 }
226 }
227
228 dev_dbg(pctl->dev, "set sleep gpio state(pin=%d) %d\n",
229 pin, is_set);
230
231 spin_lock_irqsave(&pctl->lock, flags);
232 val = readl_relaxed(pgsr);
233 val = (val & ~BIT(pin % 32)) | (is_set ? BIT(pin % 32) : 0);
234 writel_relaxed(val, pgsr);
235 spin_unlock_irqrestore(&pctl->lock, flags);
236
237 return 0;
238}
239
240static const struct pinconf_ops pxa2xx_pconf_ops = {
241 .pin_config_group_get = pxa2xx_pconf_group_get,
242 .pin_config_group_set = pxa2xx_pconf_group_set,
243 .is_generic = true,
244};
245
246static struct pinctrl_desc pxa2xx_pinctrl_desc = {
247 .confops = &pxa2xx_pconf_ops,
248 .pctlops = &pxa2xx_pctl_ops,
249 .pmxops = &pxa2xx_pinmux_ops,
250};
251
252static const struct pxa_pinctrl_function *
253pxa2xx_find_function(struct pxa_pinctrl *pctl, const char *fname,
254 const struct pxa_pinctrl_function *functions)
255{
256 const struct pxa_pinctrl_function *func;
257
258 for (func = functions; func->name; func++)
259 if (!strcmp(fname, func->name))
260 return func;
261
262 return NULL;
263}
264
265static int pxa2xx_build_functions(struct pxa_pinctrl *pctl)
266{
267 int i;
268 struct pxa_pinctrl_function *functions;
269 struct pxa_desc_function *df;
270
271
272
273
274
275
276
277 functions = devm_kcalloc(pctl->dev, pctl->npins * 6,
278 sizeof(*functions), GFP_KERNEL);
279 if (!functions)
280 return -ENOMEM;
281
282 for (i = 0; i < pctl->npins; i++)
283 for (df = pctl->ppins[i].functions; df->name; df++)
284 if (!pxa2xx_find_function(pctl, df->name, functions))
285 (functions + pctl->nfuncs++)->name = df->name;
286 pctl->functions = devm_kmemdup(pctl->dev, functions,
287 pctl->nfuncs * sizeof(*functions),
288 GFP_KERNEL);
289 if (!pctl->functions)
290 return -ENOMEM;
291
292 devm_kfree(pctl->dev, functions);
293 return 0;
294}
295
296static int pxa2xx_build_groups(struct pxa_pinctrl *pctl)
297{
298 int i, j, ngroups;
299 struct pxa_pinctrl_function *func;
300 struct pxa_desc_function *df;
301 char **gtmp;
302
303 gtmp = devm_kmalloc_array(pctl->dev, pctl->npins, sizeof(*gtmp),
304 GFP_KERNEL);
305 if (!gtmp)
306 return -ENOMEM;
307
308 for (i = 0; i < pctl->nfuncs; i++) {
309 ngroups = 0;
310 for (j = 0; j < pctl->npins; j++)
311 for (df = pctl->ppins[j].functions; df->name;
312 df++)
313 if (!strcmp(pctl->functions[i].name,
314 df->name))
315 gtmp[ngroups++] = (char *)
316 pctl->ppins[j].pin.name;
317 func = pctl->functions + i;
318 func->ngroups = ngroups;
319 func->groups =
320 devm_kmalloc_array(pctl->dev, ngroups,
321 sizeof(char *), GFP_KERNEL);
322 if (!func->groups)
323 return -ENOMEM;
324
325 memcpy(func->groups, gtmp, ngroups * sizeof(*gtmp));
326 }
327
328 devm_kfree(pctl->dev, gtmp);
329 return 0;
330}
331
332static int pxa2xx_build_state(struct pxa_pinctrl *pctl,
333 const struct pxa_desc_pin *ppins, int npins)
334{
335 struct pxa_pinctrl_group *group;
336 struct pinctrl_pin_desc *pins;
337 int ret, i;
338
339 pctl->npins = npins;
340 pctl->ppins = ppins;
341 pctl->ngroups = npins;
342
343 pctl->desc.npins = npins;
344 pins = devm_kcalloc(pctl->dev, npins, sizeof(*pins), GFP_KERNEL);
345 if (!pins)
346 return -ENOMEM;
347
348 pctl->desc.pins = pins;
349 for (i = 0; i < npins; i++)
350 pins[i] = ppins[i].pin;
351
352 pctl->groups = devm_kmalloc_array(pctl->dev, pctl->ngroups,
353 sizeof(*pctl->groups), GFP_KERNEL);
354 if (!pctl->groups)
355 return -ENOMEM;
356
357 for (i = 0; i < npins; i++) {
358 group = pctl->groups + i;
359 group->name = ppins[i].pin.name;
360 group->pin = ppins[i].pin.number;
361 }
362
363 ret = pxa2xx_build_functions(pctl);
364 if (ret)
365 return ret;
366
367 ret = pxa2xx_build_groups(pctl);
368 if (ret)
369 return ret;
370
371 return 0;
372}
373
374int pxa2xx_pinctrl_init(struct platform_device *pdev,
375 const struct pxa_desc_pin *ppins, int npins,
376 void __iomem *base_gafr[], void __iomem *base_gpdr[],
377 void __iomem *base_pgsr[])
378{
379 struct pxa_pinctrl *pctl;
380 int ret, i, maxpin = 0;
381
382 for (i = 0; i < npins; i++)
383 maxpin = max_t(int, ppins[i].pin.number, maxpin);
384
385 pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
386 if (!pctl)
387 return -ENOMEM;
388 pctl->base_gafr = devm_kcalloc(&pdev->dev, roundup(maxpin, 16),
389 sizeof(*pctl->base_gafr), GFP_KERNEL);
390 pctl->base_gpdr = devm_kcalloc(&pdev->dev, roundup(maxpin, 32),
391 sizeof(*pctl->base_gpdr), GFP_KERNEL);
392 pctl->base_pgsr = devm_kcalloc(&pdev->dev, roundup(maxpin, 32),
393 sizeof(*pctl->base_pgsr), GFP_KERNEL);
394 if (!pctl->base_gafr || !pctl->base_gpdr || !pctl->base_pgsr)
395 return -ENOMEM;
396
397 platform_set_drvdata(pdev, pctl);
398 spin_lock_init(&pctl->lock);
399
400 pctl->dev = &pdev->dev;
401 pctl->desc = pxa2xx_pinctrl_desc;
402 pctl->desc.name = dev_name(&pdev->dev);
403 pctl->desc.owner = THIS_MODULE;
404
405 for (i = 0; i < roundup(maxpin, 16); i += 16)
406 pctl->base_gafr[i / 16] = base_gafr[i / 16];
407 for (i = 0; i < roundup(maxpin, 32); i += 32) {
408 pctl->base_gpdr[i / 32] = base_gpdr[i / 32];
409 pctl->base_pgsr[i / 32] = base_pgsr[i / 32];
410 }
411
412 ret = pxa2xx_build_state(pctl, ppins, npins);
413 if (ret)
414 return ret;
415
416 pctl->pctl_dev = devm_pinctrl_register(&pdev->dev, &pctl->desc, pctl);
417 if (IS_ERR(pctl->pctl_dev)) {
418 dev_err(&pdev->dev, "couldn't register pinctrl driver\n");
419 return PTR_ERR(pctl->pctl_dev);
420 }
421
422 dev_info(&pdev->dev, "initialized pxa2xx pinctrl driver\n");
423
424 return 0;
425}
426EXPORT_SYMBOL_GPL(pxa2xx_pinctrl_init);
427
428MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
429MODULE_DESCRIPTION("Marvell PXA2xx pinctrl driver");
430MODULE_LICENSE("GPL v2");
431
