summaryrefslogtreecommitdiffstats
path: root/drivers/pinctrl/sh-pfc/core.c
blob: b551336924a55c4a6ce5d1ebd0f500b74250e646 (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
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
/*
 * SuperH Pin Function Controller support.
 *
 * Copyright (C) 2008 Magnus Damm
 * Copyright (C) 2009 - 2012 Paul Mundt
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#define DRV_NAME "sh-pfc"

#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pinctrl/machine.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include "core.h"

static int sh_pfc_ioremap(struct sh_pfc *pfc, struct platform_device *pdev)
{
	struct resource *res;
	int k;

	if (pdev->num_resources == 0)
		return -EINVAL;

	pfc->window = devm_kzalloc(pfc->dev, pdev->num_resources *
				   sizeof(*pfc->window), GFP_NOWAIT);
	if (!pfc->window)
		return -ENOMEM;

	pfc->num_windows = pdev->num_resources;

	for (k = 0, res = pdev->resource; k < pdev->num_resources; k++, res++) {
		WARN_ON(resource_type(res) != IORESOURCE_MEM);
		pfc->window[k].phys = res->start;
		pfc->window[k].size = resource_size(res);
		pfc->window[k].virt = devm_ioremap_nocache(pfc->dev, res->start,
							   resource_size(res));
		if (!pfc->window[k].virt)
			return -ENOMEM;
	}

	return 0;
}

static void __iomem *sh_pfc_phys_to_virt(struct sh_pfc *pfc,
					 unsigned long address)
{
	struct sh_pfc_window *window;
	unsigned int i;

	/* scan through physical windows and convert address */
	for (i = 0; i < pfc->num_windows; i++) {
		window = pfc->window + i;

		if (address < window->phys)
			continue;

		if (address >= (window->phys + window->size))
			continue;

		return window->virt + (address - window->phys);
	}

	BUG();
	return NULL;
}

int sh_pfc_get_pin_index(struct sh_pfc *pfc, unsigned int pin)
{
	unsigned int offset;
	unsigned int i;

	if (pfc->info->ranges == NULL)
		return pin;

	for (i = 0, offset = 0; i < pfc->info->nr_ranges; ++i) {
		const struct pinmux_range *range = &pfc->info->ranges[i];

		if (pin <= range->end)
			return pin >= range->begin
			     ? offset + pin - range->begin : -1;

		offset += range->end - range->begin + 1;
	}

	return -EINVAL;
}

static int sh_pfc_enum_in_range(pinmux_enum_t enum_id,
				const struct pinmux_range *r)
{
	if (enum_id < r->begin)
		return 0;

	if (enum_id > r->end)
		return 0;

	return 1;
}

unsigned long sh_pfc_read_raw_reg(void __iomem *mapped_reg,
				  unsigned long reg_width)
{
	switch (reg_width) {
	case 8:
		return ioread8(mapped_reg);
	case 16:
		return ioread16(mapped_reg);
	case 32:
		return ioread32(mapped_reg);
	}

	BUG();
	return 0;
}

void sh_pfc_write_raw_reg(void __iomem *mapped_reg, unsigned long reg_width,
			  unsigned long data)
{
	switch (reg_width) {
	case 8:
		iowrite8(data, mapped_reg);
		return;
	case 16:
		iowrite16(data, mapped_reg);
		return;
	case 32:
		iowrite32(data, mapped_reg);
		return;
	}

	BUG();
}

static void sh_pfc_config_reg_helper(struct sh_pfc *pfc,
				     const struct pinmux_cfg_reg *crp,
				     unsigned long in_pos,
				     void __iomem **mapped_regp,
				     unsigned long *maskp,
				     unsigned long *posp)
{
	int k;

	*mapped_regp = sh_pfc_phys_to_virt(pfc, crp->reg);

	if (crp->field_width) {
		*maskp = (1 << crp->field_width) - 1;
		*posp = crp->reg_width - ((in_pos + 1) * crp->field_width);
	} else {
		*maskp = (1 << crp->var_field_width[in_pos]) - 1;
		*posp = crp->reg_width;
		for (k = 0; k <= in_pos; k++)
			*posp -= crp->var_field_width[k];
	}
}

static void sh_pfc_write_config_reg(struct sh_pfc *pfc,
				    const struct pinmux_cfg_reg *crp,
				    unsigned long field, unsigned long value)
{
	void __iomem *mapped_reg;
	unsigned long mask, pos, data;

	sh_pfc_config_reg_helper(pfc, crp, field, &mapped_reg, &mask, &pos);

	dev_dbg(pfc->dev, "write_reg addr = %lx, value = %ld, field = %ld, "
		"r_width = %ld, f_width = %ld\n",
		crp->reg, value, field, crp->reg_width, crp->field_width);

	mask = ~(mask << pos);
	value = value << pos;

	data = sh_pfc_read_raw_reg(mapped_reg, crp->reg_width);
	data &= mask;
	data |= value;

	if (pfc->info->unlock_reg)
		sh_pfc_write_raw_reg(
			sh_pfc_phys_to_virt(pfc, pfc->info->unlock_reg), 32,
			~data);

	sh_pfc_write_raw_reg(mapped_reg, crp->reg_width, data);
}

static int sh_pfc_get_config_reg(struct sh_pfc *pfc, pinmux_enum_t enum_id,
				 const struct pinmux_cfg_reg **crp, int *fieldp,
				 int *valuep)
{
	const struct pinmux_cfg_reg *config_reg;
	unsigned long r_width, f_width, curr_width, ncomb;
	int k, m, n, pos, bit_pos;

	k = 0;
	while (1) {
		config_reg = pfc->info->cfg_regs + k;

		r_width = config_reg->reg_width;
		f_width = config_reg->field_width;

		if (!r_width)
			break;

		pos = 0;
		m = 0;
		for (bit_pos = 0; bit_pos < r_width; bit_pos += curr_width) {
			if (f_width)
				curr_width = f_width;
			else
				curr_width = config_reg->var_field_width[m];

			ncomb = 1 << curr_width;
			for (n = 0; n < ncomb; n++) {
				if (config_reg->enum_ids[pos + n] == enum_id) {
					*crp = config_reg;
					*fieldp = m;
					*valuep = n;
					return 0;
				}
			}
			pos += ncomb;
			m++;
		}
		k++;
	}

	return -EINVAL;
}

static int sh_pfc_mark_to_enum(struct sh_pfc *pfc, pinmux_enum_t mark, int pos,
			      pinmux_enum_t *enum_idp)
{
	const pinmux_enum_t *data = pfc->info->gpio_data;
	int k;

	if (pos) {
		*enum_idp = data[pos + 1];
		return pos + 1;
	}

	for (k = 0; k < pfc->info->gpio_data_size; k++) {
		if (data[k] == mark) {
			*enum_idp = data[k + 1];
			return k + 1;
		}
	}

	dev_err(pfc->dev, "cannot locate data/mark enum_id for mark %d\n",
		mark);
	return -EINVAL;
}

int sh_pfc_config_mux(struct sh_pfc *pfc, unsigned mark, int pinmux_type)
{
	const struct pinmux_cfg_reg *cr = NULL;
	pinmux_enum_t enum_id;
	const struct pinmux_range *range;
	int in_range, pos, field, value;
	int ret;

	switch (pinmux_type) {
	case PINMUX_TYPE_GPIO:
	case PINMUX_TYPE_FUNCTION:
		range = NULL;
		break;

	case PINMUX_TYPE_OUTPUT:
		range = &pfc->info->output;
		break;

	case PINMUX_TYPE_INPUT:
		range = &pfc->info->input;
		break;

	case PINMUX_TYPE_INPUT_PULLUP:
		range = &pfc->info->input_pu;
		break;

	case PINMUX_TYPE_INPUT_PULLDOWN:
		range = &pfc->info->input_pd;
		break;

	default:
		return -EINVAL;
	}

	pos = 0;
	enum_id = 0;
	field = 0;
	value = 0;

	/* Iterate over all the configuration fields we need to update. */
	while (1) {
		pos = sh_pfc_mark_to_enum(pfc, mark, pos, &enum_id);
		if (pos < 0)
			return pos;

		if (!enum_id)
			break;

		/* Check if the configuration field selects a function. If it
		 * doesn't, skip the field if it's not applicable to the
		 * requested pinmux type.
		 */
		in_range = sh_pfc_enum_in_range(enum_id, &pfc->info->function);
		if (!in_range) {
			if (pinmux_type == PINMUX_TYPE_FUNCTION) {
				/* Functions are allowed to modify all
				 * fields.
				 */
				in_range = 1;
			} else if (pinmux_type != PINMUX_TYPE_GPIO) {
				/* Input/output types can only modify fields
				 * that correspond to their respective ranges.
				 */
				in_range = sh_pfc_enum_in_range(enum_id, range);

				/*
				 * special case pass through for fixed
				 * input-only or output-only pins without
				 * function enum register association.
				 */
				if (in_range && enum_id == range->force)
					continue;
			}
			/* GPIOs are only allowed to modify function fields. */
		}

		if (!in_range)
			continue;

		ret = sh_pfc_get_config_reg(pfc, enum_id, &cr, &field, &value);
		if (ret < 0)
			return ret;

		sh_pfc_write_config_reg(pfc, cr, field, value);
	}

	return 0;
}

static int sh_pfc_probe(struct platform_device *pdev)
{
	const struct sh_pfc_soc_info *info;
	struct sh_pfc *pfc;
	int ret;

	info = pdev->id_entry->driver_data
	      ? (void *)pdev->id_entry->driver_data : pdev->dev.platform_data;
	if (info == NULL)
		return -ENODEV;

	pfc = devm_kzalloc(&pdev->dev, sizeof(*pfc), GFP_KERNEL);
	if (pfc == NULL)
		return -ENOMEM;

	pfc->info = info;
	pfc->dev = &pdev->dev;

	ret = sh_pfc_ioremap(pfc, pdev);
	if (unlikely(ret < 0))
		return ret;

	spin_lock_init(&pfc->lock);

	pinctrl_provide_dummies();

	/*
	 * Initialize pinctrl bindings first
	 */
	ret = sh_pfc_register_pinctrl(pfc);
	if (unlikely(ret != 0))
		return ret;

#ifdef CONFIG_GPIO_SH_PFC
	/*
	 * Then the GPIO chip
	 */
	ret = sh_pfc_register_gpiochip(pfc);
	if (unlikely(ret != 0)) {
		/*
		 * If the GPIO chip fails to come up we still leave the
		 * PFC state as it is, given that there are already
		 * extant users of it that have succeeded by this point.
		 */
		dev_notice(pfc->dev, "failed to init GPIO chip, ignoring...\n");
	}
#endif

	platform_set_drvdata(pdev, pfc);

	dev_info(pfc->dev, "%s support registered\n", info->name);

	return 0;
}

static int sh_pfc_remove(struct platform_device *pdev)
{
	struct sh_pfc *pfc = platform_get_drvdata(pdev);

#ifdef CONFIG_GPIO_SH_PFC
	sh_pfc_unregister_gpiochip(pfc);
#endif
	sh_pfc_unregister_pinctrl(pfc);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

static const struct platform_device_id sh_pfc_id_table[] = {
#ifdef CONFIG_PINCTRL_PFC_R8A73A4
	{ "pfc-r8a73a4", (kernel_ulong_t)&r8a73a4_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A7740
	{ "pfc-r8a7740", (kernel_ulong_t)&r8a7740_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_R8A7779
	{ "pfc-r8a7779", (kernel_ulong_t)&r8a7779_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7203
	{ "pfc-sh7203", (kernel_ulong_t)&sh7203_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7264
	{ "pfc-sh7264", (kernel_ulong_t)&sh7264_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7269
	{ "pfc-sh7269", (kernel_ulong_t)&sh7269_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7372
	{ "pfc-sh7372", (kernel_ulong_t)&sh7372_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH73A0
	{ "pfc-sh73a0", (kernel_ulong_t)&sh73a0_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7720
	{ "pfc-sh7720", (kernel_ulong_t)&sh7720_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7722
	{ "pfc-sh7722", (kernel_ulong_t)&sh7722_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7723
	{ "pfc-sh7723", (kernel_ulong_t)&sh7723_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7724
	{ "pfc-sh7724", (kernel_ulong_t)&sh7724_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7734
	{ "pfc-sh7734", (kernel_ulong_t)&sh7734_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7757
	{ "pfc-sh7757", (kernel_ulong_t)&sh7757_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7785
	{ "pfc-sh7785", (kernel_ulong_t)&sh7785_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SH7786
	{ "pfc-sh7786", (kernel_ulong_t)&sh7786_pinmux_info },
#endif
#ifdef CONFIG_PINCTRL_PFC_SHX3
	{ "pfc-shx3", (kernel_ulong_t)&shx3_pinmux_info },
#endif
	{ "sh-pfc", 0 },
	{ },
};
MODULE_DEVICE_TABLE(platform, sh_pfc_id_table);

static struct platform_driver sh_pfc_driver = {
	.probe		= sh_pfc_probe,
	.remove		= sh_pfc_remove,
	.id_table	= sh_pfc_id_table,
	.driver		= {
		.name	= DRV_NAME,
		.owner	= THIS_MODULE,
	},
};

static int __init sh_pfc_init(void)
{
	return platform_driver_register(&sh_pfc_driver);
}
postcore_initcall(sh_pfc_init);

static void __exit sh_pfc_exit(void)
{
	platform_driver_unregister(&sh_pfc_driver);
}
module_exit(sh_pfc_exit);

MODULE_AUTHOR("Magnus Damm, Paul Mundt, Laurent Pinchart");
MODULE_DESCRIPTION("Pin Control and GPIO driver for SuperH pin function controller");
MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud