aboutsummaryrefslogtreecommitdiff
path: root/drivers/pinctrl/spear/pinctrl-spear.c
blob: 116da0412c4b7af55b36d25663f9f762995c0334 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
/*
 * Driver for the ST Microelectronics SPEAr pinmux
 *
 * Copyright (C) 2012 ST Microelectronics
 * Viresh Kumar <viresh.linux@gmail.com>
 *
 * Inspired from:
 * - U300 Pinctl drivers
 * - Tegra Pinctl drivers
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_gpio.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include "pinctrl-spear.h"

#define DRIVER_NAME "spear-pinmux"

static void muxregs_endisable(struct spear_pmx *pmx,
		struct spear_muxreg *muxregs, u8 count, bool enable)
{
	struct spear_muxreg *muxreg;
	u32 val, temp, j;

	for (j = 0; j < count; j++) {
		muxreg = &muxregs[j];

		val = pmx_readl(pmx, muxreg->reg);
		val &= ~muxreg->mask;

		if (enable)
			temp = muxreg->val;
		else
			temp = ~muxreg->val;

		val |= muxreg->mask & temp;
		pmx_writel(pmx, val, muxreg->reg);
	}
}

static int set_mode(struct spear_pmx *pmx, int mode)
{
	struct spear_pmx_mode *pmx_mode = NULL;
	int i;
	u32 val;

	if (!pmx->machdata->pmx_modes || !pmx->machdata->npmx_modes)
		return -EINVAL;

	for (i = 0; i < pmx->machdata->npmx_modes; i++) {
		if (pmx->machdata->pmx_modes[i]->mode == (1 << mode)) {
			pmx_mode = pmx->machdata->pmx_modes[i];
			break;
		}
	}

	if (!pmx_mode)
		return -EINVAL;

	val = pmx_readl(pmx, pmx_mode->reg);
	val &= ~pmx_mode->mask;
	val |= pmx_mode->val;
	pmx_writel(pmx, val, pmx_mode->reg);

	pmx->machdata->mode = pmx_mode->mode;
	dev_info(pmx->dev, "Configured Mode: %s with id: %x\n\n",
			pmx_mode->name ? pmx_mode->name : "no_name",
			pmx_mode->reg);

	return 0;
}

void pmx_init_gpio_pingroup_addr(struct spear_gpio_pingroup *gpio_pingroup,
				 unsigned count, u16 reg)
{
	int i, j;

	for (i = 0; i < count; i++)
		for (j = 0; j < gpio_pingroup[i].nmuxregs; j++)
			gpio_pingroup[i].muxregs[j].reg = reg;
}

void pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg)
{
	struct spear_pingroup *pgroup;
	struct spear_modemux *modemux;
	int i, j, group;

	for (group = 0; group < machdata->ngroups; group++) {
		pgroup = machdata->groups[group];

		for (i = 0; i < pgroup->nmodemuxs; i++) {
			modemux = &pgroup->modemuxs[i];

			for (j = 0; j < modemux->nmuxregs; j++)
				if (modemux->muxregs[j].reg == 0xFFFF)
					modemux->muxregs[j].reg = reg;
		}
	}
}

static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->machdata->ngroups;
}

static const char *spear_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
		unsigned group)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->machdata->groups[group]->name;
}

static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
		unsigned group, const unsigned **pins, unsigned *num_pins)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	*pins = pmx->machdata->groups[group]->pins;
	*num_pins = pmx->machdata->groups[group]->npins;

	return 0;
}

static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
		struct seq_file *s, unsigned offset)
{
	seq_printf(s, " " DRIVER_NAME);
}

static int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
					struct device_node *np_config,
					struct pinctrl_map **map,
					unsigned *num_maps)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
	struct device_node *np;
	struct property *prop;
	const char *function, *group;
	int ret, index = 0, count = 0;

	/* calculate number of maps required */
	for_each_child_of_node(np_config, np) {
		ret = of_property_read_string(np, "st,function", &function);
		if (ret < 0)
			return ret;

		ret = of_property_count_strings(np, "st,pins");
		if (ret < 0)
			return ret;

		count += ret;
	}

	if (!count) {
		dev_err(pmx->dev, "No child nodes passed via DT\n");
		return -ENODEV;
	}

	*map = kzalloc(sizeof(**map) * count, GFP_KERNEL);
	if (!*map)
		return -ENOMEM;

	for_each_child_of_node(np_config, np) {
		of_property_read_string(np, "st,function", &function);
		of_property_for_each_string(np, "st,pins", prop, group) {
			(*map)[index].type = PIN_MAP_TYPE_MUX_GROUP;
			(*map)[index].data.mux.group = group;
			(*map)[index].data.mux.function = function;
			index++;
		}
	}

	*num_maps = count;

	return 0;
}

static void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
				      struct pinctrl_map *map,
				      unsigned num_maps)
{
	kfree(map);
}

static const struct pinctrl_ops spear_pinctrl_ops = {
	.get_groups_count = spear_pinctrl_get_groups_cnt,
	.get_group_name = spear_pinctrl_get_group_name,
	.get_group_pins = spear_pinctrl_get_group_pins,
	.pin_dbg_show = spear_pinctrl_pin_dbg_show,
	.dt_node_to_map = spear_pinctrl_dt_node_to_map,
	.dt_free_map = spear_pinctrl_dt_free_map,
};

static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->machdata->nfunctions;
}

static const char *spear_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
		unsigned function)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->machdata->functions[function]->name;
}

static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
		unsigned function, const char *const **groups,
		unsigned * const ngroups)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	*groups = pmx->machdata->functions[function]->groups;
	*ngroups = pmx->machdata->functions[function]->ngroups;

	return 0;
}

static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev,
		unsigned function, unsigned group, bool enable)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
	const struct spear_pingroup *pgroup;
	const struct spear_modemux *modemux;
	int i;
	bool found = false;

	pgroup = pmx->machdata->groups[group];

	for (i = 0; i < pgroup->nmodemuxs; i++) {
		modemux = &pgroup->modemuxs[i];

		/* SoC have any modes */
		if (pmx->machdata->modes_supported) {
			if (!(pmx->machdata->mode & modemux->modes))
				continue;
		}

		found = true;
		muxregs_endisable(pmx, modemux->muxregs, modemux->nmuxregs,
				enable);
	}

	if (!found) {
		dev_err(pmx->dev, "pinmux group: %s not supported\n",
				pgroup->name);
		return -ENODEV;
	}

	return 0;
}

static int spear_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned function,
		unsigned group)
{
	return spear_pinctrl_endisable(pctldev, function, group, true);
}

static void spear_pinctrl_disable(struct pinctrl_dev *pctldev,
		unsigned function, unsigned group)
{
	spear_pinctrl_endisable(pctldev, function, group, false);
}

/* gpio with pinmux */
static struct spear_gpio_pingroup *get_gpio_pingroup(struct spear_pmx *pmx,
		unsigned pin)
{
	struct spear_gpio_pingroup *gpio_pingroup;
	int i, j;

	if (!pmx->machdata->gpio_pingroups)
		return NULL;

	for (i = 0; i < pmx->machdata->ngpio_pingroups; i++) {
		gpio_pingroup = &pmx->machdata->gpio_pingroups[i];

		for (j = 0; j < gpio_pingroup->npins; j++) {
			if (gpio_pingroup->pins[j] == pin)
				return gpio_pingroup;
		}
	}

	return NULL;
}

static int gpio_request_endisable(struct pinctrl_dev *pctldev,
		struct pinctrl_gpio_range *range, unsigned offset, bool enable)
{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
	struct spear_pinctrl_machdata *machdata = pmx->machdata;
	struct spear_gpio_pingroup *gpio_pingroup;

	/*
	 * Some SoC have configuration options applicable to group of pins,
	 * rather than a single pin.
	 */
	gpio_pingroup = get_gpio_pingroup(pmx, offset);
	if (gpio_pingroup)
		muxregs_endisable(pmx, gpio_pingroup->muxregs,
				gpio_pingroup->nmuxregs, enable);

	/*
	 * SoC may need some extra configurations, or configurations for single
	 * pin
	 */
	if (machdata->gpio_request_endisable)
		machdata->gpio_request_endisable(pmx, offset, enable);

	return 0;
}

static int gpio_request_enable(struct pinctrl_dev *pctldev,
		struct pinctrl_gpio_range *range, unsigned offset)
{
	return gpio_request_endisable(pctldev, range, offset, true);
}

static void gpio_disable_free(struct pinctrl_dev *pctldev,
		struct pinctrl_gpio_range *range, unsigned offset)
{
	gpio_request_endisable(pctldev, range, offset, false);
}

static const struct pinmux_ops spear_pinmux_ops = {
	.get_functions_count = spear_pinctrl_get_funcs_count,
	.get_function_name = spear_pinctrl_get_func_name,
	.get_function_groups = spear_pinctrl_get_func_groups,
	.enable = spear_pinctrl_enable,
	.disable = spear_pinctrl_disable,
	.gpio_request_enable = gpio_request_enable,
	.gpio_disable_free = gpio_disable_free,
};

static struct pinctrl_desc spear_pinctrl_desc = {
	.name = DRIVER_NAME,
	.pctlops = &spear_pinctrl_ops,
	.pmxops = &spear_pinmux_ops,
	.owner = THIS_MODULE,
};

int spear_pinctrl_probe(struct platform_device *pdev,
			struct spear_pinctrl_machdata *machdata)
{
	struct device_node *np = pdev->dev.of_node;
	struct resource *res;
	struct spear_pmx *pmx;

	if (!machdata)
		return -ENODEV;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -EINVAL;

	pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
	if (!pmx) {
		dev_err(&pdev->dev, "Can't alloc spear_pmx\n");
		return -ENOMEM;
	}

	pmx->vbase = devm_ioremap(&pdev->dev, res->start, resource_size(res));
	if (!pmx->vbase) {
		dev_err(&pdev->dev, "Couldn't ioremap at index 0\n");
		return -ENODEV;
	}

	pmx->dev = &pdev->dev;
	pmx->machdata = machdata;

	/* configure mode, if supported by SoC */
	if (machdata->modes_supported) {
		int mode = 0;

		if (of_property_read_u32(np, "st,pinmux-mode", &mode)) {
			dev_err(&pdev->dev, "OF: pinmux mode not passed\n");
			return -EINVAL;
		}

		if (set_mode(pmx, mode)) {
			dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n",
					mode);
			return -EINVAL;
		}
	}

	platform_set_drvdata(pdev, pmx);

	spear_pinctrl_desc.pins = machdata->pins;
	spear_pinctrl_desc.npins = machdata->npins;

	pmx->pctl = pinctrl_register(&spear_pinctrl_desc, &pdev->dev, pmx);
	if (!pmx->pctl) {
		dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
		return -ENODEV;
	}

	return 0;
}

int spear_pinctrl_remove(struct platform_device *pdev)
{
	struct spear_pmx *pmx = platform_get_drvdata(pdev);

	pinctrl_unregister(pmx->pctl);

	return 0;
}