summaryrefslogtreecommitdiffstats
path: root/drivers/pinctrl/bcm/pinctrl-ns.c
blob: e79690bd8b85f25a9e8a9665dd4a1cc08bbb8ca8 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2018 Rafał Miłecki <rafal@milecki.pl>
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>

#define FLAG_BCM4708		BIT(1)
#define FLAG_BCM4709		BIT(2)
#define FLAG_BCM53012		BIT(3)

struct ns_pinctrl {
	struct device *dev;
	unsigned int chipset_flag;
	struct pinctrl_dev *pctldev;
	struct regmap *regmap;
	u32 offset;

	struct pinctrl_desc pctldesc;
	struct ns_pinctrl_group *groups;
	unsigned int num_groups;
	struct ns_pinctrl_function *functions;
	unsigned int num_functions;
};

/*
 * Pins
 */

static const struct pinctrl_pin_desc ns_pinctrl_pins[] = {
	{ 0, "spi_clk", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
	{ 1, "spi_ss", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
	{ 2, "spi_mosi", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
	{ 3, "spi_miso", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
	{ 4, "i2c_scl", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
	{ 5, "i2c_sda", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
	{ 6, "mdc", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
	{ 7, "mdio", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
	{ 8, "pwm0", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
	{ 9, "pwm1", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
	{ 10, "pwm2", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
	{ 11, "pwm3", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
	{ 12, "uart1_rx", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
	{ 13, "uart1_tx", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
	{ 14, "uart1_cts", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
	{ 15, "uart1_rts", (void *)(FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012) },
	{ 16, "uart2_rx", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
	{ 17, "uart2_tx", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
/* TODO { ??, "xtal_out", (void *)(FLAG_BCM4709) }, */
	{ 22, "sdio_pwr", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
	{ 23, "sdio_en_1p8v", (void *)(FLAG_BCM4709 | FLAG_BCM53012) },
};

/*
 * Groups
 */

struct ns_pinctrl_group {
	const char *name;
	const unsigned int *pins;
	const unsigned int num_pins;
	unsigned int chipsets;
};

static const unsigned int spi_pins[] = { 0, 1, 2, 3 };
static const unsigned int i2c_pins[] = { 4, 5 };
static const unsigned int mdio_pins[] = { 6, 7 };
static const unsigned int pwm0_pins[] = { 8 };
static const unsigned int pwm1_pins[] = { 9 };
static const unsigned int pwm2_pins[] = { 10 };
static const unsigned int pwm3_pins[] = { 11 };
static const unsigned int uart1_pins[] = { 12, 13, 14, 15 };
static const unsigned int uart2_pins[] = { 16, 17 };
static const unsigned int sdio_pwr_pins[] = { 22 };
static const unsigned int sdio_1p8v_pins[] = { 23 };

#define NS_GROUP(_name, _pins, _chipsets)		\
{							\
	.name = _name,					\
	.pins = _pins,					\
	.num_pins = ARRAY_SIZE(_pins),			\
	.chipsets = _chipsets,				\
}

static const struct ns_pinctrl_group ns_pinctrl_groups[] = {
	NS_GROUP("spi_grp", spi_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
	NS_GROUP("i2c_grp", i2c_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
	NS_GROUP("mdio_grp", mdio_pins, FLAG_BCM4709 | FLAG_BCM53012),
	NS_GROUP("pwm0_grp", pwm0_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
	NS_GROUP("pwm1_grp", pwm1_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
	NS_GROUP("pwm2_grp", pwm2_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
	NS_GROUP("pwm3_grp", pwm3_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
	NS_GROUP("uart1_grp", uart1_pins, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
	NS_GROUP("uart2_grp", uart2_pins, FLAG_BCM4709 | FLAG_BCM53012),
	NS_GROUP("sdio_pwr_grp", sdio_pwr_pins, FLAG_BCM4709 | FLAG_BCM53012),
	NS_GROUP("sdio_1p8v_grp", sdio_1p8v_pins, FLAG_BCM4709 | FLAG_BCM53012),
};

/*
 * Functions
 */

struct ns_pinctrl_function {
	const char *name;
	const char * const *groups;
	const unsigned int num_groups;
	unsigned int chipsets;
};

static const char * const spi_groups[] = { "spi_grp" };
static const char * const i2c_groups[] = { "i2c_grp" };
static const char * const mdio_groups[] = { "mdio_grp" };
static const char * const pwm_groups[] = { "pwm0_grp", "pwm1_grp", "pwm2_grp",
					   "pwm3_grp" };
static const char * const uart1_groups[] = { "uart1_grp" };
static const char * const uart2_groups[] = { "uart2_grp" };
static const char * const sdio_groups[] = { "sdio_pwr_grp", "sdio_1p8v_grp" };

#define NS_FUNCTION(_name, _groups, _chipsets)		\
{							\
	.name = _name,					\
	.groups = _groups,				\
	.num_groups = ARRAY_SIZE(_groups),		\
	.chipsets = _chipsets,				\
}

static const struct ns_pinctrl_function ns_pinctrl_functions[] = {
	NS_FUNCTION("spi", spi_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
	NS_FUNCTION("i2c", i2c_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
	NS_FUNCTION("mdio", mdio_groups, FLAG_BCM4709 | FLAG_BCM53012),
	NS_FUNCTION("pwm", pwm_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
	NS_FUNCTION("uart1", uart1_groups, FLAG_BCM4708 | FLAG_BCM4709 | FLAG_BCM53012),
	NS_FUNCTION("uart2", uart2_groups, FLAG_BCM4709 | FLAG_BCM53012),
	NS_FUNCTION("sdio", sdio_groups, FLAG_BCM4709 | FLAG_BCM53012),
};

/*
 * Groups code
 */

static int ns_pinctrl_get_groups_count(struct pinctrl_dev *pctrl_dev)
{
	struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	return ns_pinctrl->num_groups;
}

static const char *ns_pinctrl_get_group_name(struct pinctrl_dev *pctrl_dev,
					     unsigned int selector)
{
	struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	return ns_pinctrl->groups[selector].name;
}

static int ns_pinctrl_get_group_pins(struct pinctrl_dev *pctrl_dev,
				     unsigned int selector,
				     const unsigned int **pins,
				     unsigned int *num_pins)
{
	struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	*pins = ns_pinctrl->groups[selector].pins;
	*num_pins = ns_pinctrl->groups[selector].num_pins;

	return 0;
}

static const struct pinctrl_ops ns_pinctrl_ops = {
	.get_groups_count = ns_pinctrl_get_groups_count,
	.get_group_name = ns_pinctrl_get_group_name,
	.get_group_pins = ns_pinctrl_get_group_pins,
	.dt_node_to_map = pinconf_generic_dt_node_to_map_group,
	.dt_free_map = pinconf_generic_dt_free_map,
};

/*
 * Functions code
 */

static int ns_pinctrl_get_functions_count(struct pinctrl_dev *pctrl_dev)
{
	struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	return ns_pinctrl->num_functions;
}

static const char *ns_pinctrl_get_function_name(struct pinctrl_dev *pctrl_dev,
						unsigned int selector)
{
	struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	return ns_pinctrl->functions[selector].name;
}

static int ns_pinctrl_get_function_groups(struct pinctrl_dev *pctrl_dev,
					  unsigned int selector,
					  const char * const **groups,
					  unsigned * const num_groups)
{
	struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);

	*groups = ns_pinctrl->functions[selector].groups;
	*num_groups = ns_pinctrl->functions[selector].num_groups;

	return 0;
}

static int ns_pinctrl_set_mux(struct pinctrl_dev *pctrl_dev,
			      unsigned int func_select,
			      unsigned int grp_select)
{
	struct ns_pinctrl *ns_pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
	u32 unset = 0;
	u32 tmp;
	int i;

	for (i = 0; i < ns_pinctrl->groups[grp_select].num_pins; i++) {
		int pin_number = ns_pinctrl->groups[grp_select].pins[i];

		unset |= BIT(pin_number);
	}

	regmap_read(ns_pinctrl->regmap, ns_pinctrl->offset, &tmp);
	tmp &= ~unset;
	regmap_write(ns_pinctrl->regmap, ns_pinctrl->offset, tmp);

	return 0;
}

static const struct pinmux_ops ns_pinctrl_pmxops = {
	.get_functions_count = ns_pinctrl_get_functions_count,
	.get_function_name = ns_pinctrl_get_function_name,
	.get_function_groups = ns_pinctrl_get_function_groups,
	.set_mux = ns_pinctrl_set_mux,
};

/*
 * Controller code
 */

static struct pinctrl_desc ns_pinctrl_desc = {
	.name = "pinctrl-ns",
	.pctlops = &ns_pinctrl_ops,
	.pmxops = &ns_pinctrl_pmxops,
};

static const struct of_device_id ns_pinctrl_of_match_table[] = {
	{ .compatible = "brcm,bcm4708-pinmux", .data = (void *)FLAG_BCM4708, },
	{ .compatible = "brcm,bcm4709-pinmux", .data = (void *)FLAG_BCM4709, },
	{ .compatible = "brcm,bcm53012-pinmux", .data = (void *)FLAG_BCM53012, },
	{ }
};

static int ns_pinctrl_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	const struct of_device_id *of_id;
	struct ns_pinctrl *ns_pinctrl;
	struct pinctrl_desc *pctldesc;
	struct pinctrl_pin_desc *pin;
	struct ns_pinctrl_group *group;
	struct ns_pinctrl_function *function;
	int i;

	ns_pinctrl = devm_kzalloc(dev, sizeof(*ns_pinctrl), GFP_KERNEL);
	if (!ns_pinctrl)
		return -ENOMEM;
	pctldesc = &ns_pinctrl->pctldesc;
	platform_set_drvdata(pdev, ns_pinctrl);

	/* Set basic properties */

	ns_pinctrl->dev = dev;

	of_id = of_match_device(ns_pinctrl_of_match_table, dev);
	if (!of_id)
		return -EINVAL;
	ns_pinctrl->chipset_flag = (uintptr_t)of_id->data;

	ns_pinctrl->regmap = syscon_node_to_regmap(of_get_parent(np));
	if (IS_ERR(ns_pinctrl->regmap)) {
		int err = PTR_ERR(ns_pinctrl->regmap);

		dev_err(dev, "Failed to map pinctrl regs: %d\n", err);

		return err;
	}

	if (of_property_read_u32(np, "offset", &ns_pinctrl->offset)) {
		dev_err(dev, "Failed to get register offset\n");
		return -ENOENT;
	}

	memcpy(pctldesc, &ns_pinctrl_desc, sizeof(*pctldesc));

	/* Set pinctrl properties */

	pctldesc->pins = devm_kcalloc(dev, ARRAY_SIZE(ns_pinctrl_pins),
				      sizeof(struct pinctrl_pin_desc),
				      GFP_KERNEL);
	if (!pctldesc->pins)
		return -ENOMEM;
	for (i = 0, pin = (struct pinctrl_pin_desc *)&pctldesc->pins[0];
	     i < ARRAY_SIZE(ns_pinctrl_pins); i++) {
		const struct pinctrl_pin_desc *src = &ns_pinctrl_pins[i];
		unsigned int chipsets = (uintptr_t)src->drv_data;

		if (chipsets & ns_pinctrl->chipset_flag) {
			memcpy(pin++, src, sizeof(*src));
			pctldesc->npins++;
		}
	}

	ns_pinctrl->groups = devm_kcalloc(dev, ARRAY_SIZE(ns_pinctrl_groups),
					  sizeof(struct ns_pinctrl_group),
					  GFP_KERNEL);
	if (!ns_pinctrl->groups)
		return -ENOMEM;
	for (i = 0, group = &ns_pinctrl->groups[0];
	     i < ARRAY_SIZE(ns_pinctrl_groups); i++) {
		const struct ns_pinctrl_group *src = &ns_pinctrl_groups[i];

		if (src->chipsets & ns_pinctrl->chipset_flag) {
			memcpy(group++, src, sizeof(*src));
			ns_pinctrl->num_groups++;
		}
	}

	ns_pinctrl->functions = devm_kcalloc(dev,
					     ARRAY_SIZE(ns_pinctrl_functions),
					     sizeof(struct ns_pinctrl_function),
					     GFP_KERNEL);
	if (!ns_pinctrl->functions)
		return -ENOMEM;
	for (i = 0, function = &ns_pinctrl->functions[0];
	     i < ARRAY_SIZE(ns_pinctrl_functions); i++) {
		const struct ns_pinctrl_function *src = &ns_pinctrl_functions[i];

		if (src->chipsets & ns_pinctrl->chipset_flag) {
			memcpy(function++, src, sizeof(*src));
			ns_pinctrl->num_functions++;
		}
	}

	/* Register */

	ns_pinctrl->pctldev = devm_pinctrl_register(dev, pctldesc, ns_pinctrl);
	if (IS_ERR(ns_pinctrl->pctldev)) {
		dev_err(dev, "Failed to register pinctrl\n");
		return PTR_ERR(ns_pinctrl->pctldev);
	}

	return 0;
}

static struct platform_driver ns_pinctrl_driver = {
	.probe = ns_pinctrl_probe,
	.driver = {
		.name = "ns-pinmux",
		.of_match_table = ns_pinctrl_of_match_table,
	},
};

module_platform_driver(ns_pinctrl_driver);

MODULE_AUTHOR("Rafał Miłecki");
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(of, ns_pinctrl_of_match_table);