1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Marvell PXA2xx family pin control
4  *
5  * Copyright (C) 2015 Robert Jarzmik
6  */
7 
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 
24 static 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 
31 static 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 
40 static 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 
54 static 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 
64 static struct pxa_desc_function *
65 pxa_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 
83 static 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 
108 static 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 
117 static 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 
124 static 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 
138 static 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 }
176 static 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 
184 static 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 
205 static 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 
240 static 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 
246 static struct pinctrl_desc pxa2xx_pinctrl_desc = {
247 	.confops	= &pxa2xx_pconf_ops,
248 	.pctlops	= &pxa2xx_pctl_ops,
249 	.pmxops		= &pxa2xx_pinmux_ops,
250 };
251 
252 static const struct pxa_pinctrl_function *
253 pxa2xx_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 
265 static 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 	 * Each pin can have at most 6 alternate functions, and 2 gpio functions
273 	 * which are common to each pin. As there are more than 2 pins without
274 	 * alternate function, 6 * npins is an absolute high limit of the number
275 	 * of functions.
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 
296 static 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 
332 static 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 
374 int 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 }
426 EXPORT_SYMBOL_GPL(pxa2xx_pinctrl_init);
427 
428 MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
429 MODULE_DESCRIPTION("Marvell PXA2xx pinctrl driver");
430 MODULE_LICENSE("GPL v2");
431