summaryrefslogtreecommitdiff
path: root/drivers/pinctrl/ralink/pinctrl-ralink.c
blob: 841f23f55c950851c04f964317aa64b4361540a6 (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
// SPDX-License-Identifier: GPL-2.0
/*
 *  Copyright (C) 2013 John Crispin <blogic@openwrt.org>
 */

#include <linux/module.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/machine.h>

#include <asm/mach-ralink/ralink_regs.h>
#include <asm/mach-ralink/mt7620.h>

#include "pinctrl-ralink.h"
#include "../core.h"
#include "../pinctrl-utils.h"

#define SYSC_REG_GPIO_MODE	0x60
#define SYSC_REG_GPIO_MODE2	0x64

struct ralink_priv {
	struct device *dev;

	struct pinctrl_pin_desc *pads;
	struct pinctrl_desc *desc;

	struct ralink_pmx_func **func;
	int func_count;

	struct ralink_pmx_group *groups;
	const char **group_names;
	int group_count;

	u8 *gpio;
	int max_pins;
};

static int ralink_get_group_count(struct pinctrl_dev *pctrldev)
{
	struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev);

	return p->group_count;
}

static const char *ralink_get_group_name(struct pinctrl_dev *pctrldev,
					 unsigned int group)
{
	struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev);

	return (group >= p->group_count) ? NULL : p->group_names[group];
}

static int ralink_get_group_pins(struct pinctrl_dev *pctrldev,
				 unsigned int group,
				 const unsigned int **pins,
				 unsigned int *num_pins)
{
	struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev);

	if (group >= p->group_count)
		return -EINVAL;

	*pins = p->groups[group].func[0].pins;
	*num_pins = p->groups[group].func[0].pin_count;

	return 0;
}

static const struct pinctrl_ops ralink_pctrl_ops = {
	.get_groups_count	= ralink_get_group_count,
	.get_group_name		= ralink_get_group_name,
	.get_group_pins		= ralink_get_group_pins,
	.dt_node_to_map		= pinconf_generic_dt_node_to_map_all,
	.dt_free_map		= pinconf_generic_dt_free_map,
};

static int ralink_pmx_func_count(struct pinctrl_dev *pctrldev)
{
	struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev);

	return p->func_count;
}

static const char *ralink_pmx_func_name(struct pinctrl_dev *pctrldev,
					unsigned int func)
{
	struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev);

	return p->func[func]->name;
}

static int ralink_pmx_group_get_groups(struct pinctrl_dev *pctrldev,
				       unsigned int func,
				       const char * const **groups,
				       unsigned int * const num_groups)
{
	struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev);

	if (p->func[func]->group_count == 1)
		*groups = &p->group_names[p->func[func]->groups[0]];
	else
		*groups = p->group_names;

	*num_groups = p->func[func]->group_count;

	return 0;
}

static int ralink_pmx_group_enable(struct pinctrl_dev *pctrldev,
				   unsigned int func, unsigned int group)
{
	struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev);
	u32 mode = 0;
	u32 reg = SYSC_REG_GPIO_MODE;
	int i;
	int shift;

	/* dont allow double use */
	if (p->groups[group].enabled) {
		dev_err(p->dev, "%s is already enabled\n",
			p->groups[group].name);
		return 0;
	}

	p->groups[group].enabled = 1;
	p->func[func]->enabled = 1;

	shift = p->groups[group].shift;
	if (shift >= 32) {
		shift -= 32;
		reg = SYSC_REG_GPIO_MODE2;
	}
	mode = rt_sysc_r32(reg);
	mode &= ~(p->groups[group].mask << shift);

	/* mark the pins as gpio */
	for (i = 0; i < p->groups[group].func[0].pin_count; i++)
		p->gpio[p->groups[group].func[0].pins[i]] = 1;

	/* function 0 is gpio and needs special handling */
	if (func == 0) {
		mode |= p->groups[group].gpio << shift;
	} else {
		for (i = 0; i < p->func[func]->pin_count; i++)
			p->gpio[p->func[func]->pins[i]] = 0;
		mode |= p->func[func]->value << shift;
	}
	rt_sysc_w32(mode, reg);

	return 0;
}

static int ralink_pmx_group_gpio_request_enable(struct pinctrl_dev *pctrldev,
						struct pinctrl_gpio_range *range,
						unsigned int pin)
{
	struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev);

	if (!p->gpio[pin]) {
		dev_err(p->dev, "pin %d is not set to gpio mux\n", pin);
		return -EINVAL;
	}

	return 0;
}

static const struct pinmux_ops ralink_pmx_group_ops = {
	.get_functions_count	= ralink_pmx_func_count,
	.get_function_name	= ralink_pmx_func_name,
	.get_function_groups	= ralink_pmx_group_get_groups,
	.set_mux		= ralink_pmx_group_enable,
	.gpio_request_enable	= ralink_pmx_group_gpio_request_enable,
};

static struct pinctrl_desc ralink_pctrl_desc = {
	.owner		= THIS_MODULE,
	.name		= "ralink-pinmux",
	.pctlops	= &ralink_pctrl_ops,
	.pmxops		= &ralink_pmx_group_ops,
};

static struct ralink_pmx_func gpio_func = {
	.name = "gpio",
};

static int ralink_pinmux_index(struct ralink_priv *p)
{
	struct ralink_pmx_group *mux = p->groups;
	int i, j, c = 0;

	/* count the mux functions */
	while (mux->name) {
		p->group_count++;
		mux++;
	}

	/* allocate the group names array needed by the gpio function */
	p->group_names = devm_kcalloc(p->dev, p->group_count,
				      sizeof(char *), GFP_KERNEL);
	if (!p->group_names)
		return -ENOMEM;

	for (i = 0; i < p->group_count; i++) {
		p->group_names[i] = p->groups[i].name;
		p->func_count += p->groups[i].func_count;
	}

	/* we have a dummy function[0] for gpio */
	p->func_count++;

	/* allocate our function and group mapping index buffers */
	p->func = devm_kcalloc(p->dev, p->func_count,
			       sizeof(*p->func), GFP_KERNEL);
	gpio_func.groups = devm_kcalloc(p->dev, p->group_count, sizeof(int),
					GFP_KERNEL);
	if (!p->func || !gpio_func.groups)
		return -ENOMEM;

	/* add a backpointer to the function so it knows its group */
	gpio_func.group_count = p->group_count;
	for (i = 0; i < gpio_func.group_count; i++)
		gpio_func.groups[i] = i;

	p->func[c] = &gpio_func;
	c++;

	/* add remaining functions */
	for (i = 0; i < p->group_count; i++) {
		for (j = 0; j < p->groups[i].func_count; j++) {
			p->func[c] = &p->groups[i].func[j];
			p->func[c]->groups = devm_kzalloc(p->dev, sizeof(int),
						    GFP_KERNEL);
			if (!p->func[c]->groups)
				return -ENOMEM;
			p->func[c]->groups[0] = i;
			p->func[c]->group_count = 1;
			c++;
		}
	}
	return 0;
}

static int ralink_pinmux_pins(struct ralink_priv *p)
{
	int i, j;

	/*
	 * loop over the functions and initialize the pins array.
	 * also work out the highest pin used.
	 */
	for (i = 0; i < p->func_count; i++) {
		int pin;

		if (!p->func[i]->pin_count)
			continue;

		p->func[i]->pins = devm_kcalloc(p->dev,
						p->func[i]->pin_count,
						sizeof(int),
						GFP_KERNEL);
		for (j = 0; j < p->func[i]->pin_count; j++)
			p->func[i]->pins[j] = p->func[i]->pin_first + j;

		pin = p->func[i]->pin_first + p->func[i]->pin_count;
		if (pin > p->max_pins)
			p->max_pins = pin;
	}

	/* the buffer that tells us which pins are gpio */
	p->gpio = devm_kcalloc(p->dev, p->max_pins, sizeof(u8), GFP_KERNEL);
	/* the pads needed to tell pinctrl about our pins */
	p->pads = devm_kcalloc(p->dev, p->max_pins,
			       sizeof(struct pinctrl_pin_desc), GFP_KERNEL);
	if (!p->pads || !p->gpio)
		return -ENOMEM;

	memset(p->gpio, 1, sizeof(u8) * p->max_pins);
	for (i = 0; i < p->func_count; i++) {
		if (!p->func[i]->pin_count)
			continue;

		for (j = 0; j < p->func[i]->pin_count; j++)
			p->gpio[p->func[i]->pins[j]] = 0;
	}

	/* pin 0 is always a gpio */
	p->gpio[0] = 1;

	/* set the pads */
	for (i = 0; i < p->max_pins; i++) {
		/* strlen("ioXY") + 1 = 5 */
		char *name = devm_kzalloc(p->dev, 5, GFP_KERNEL);

		if (!name)
			return -ENOMEM;
		snprintf(name, 5, "io%d", i);
		p->pads[i].number = i;
		p->pads[i].name = name;
	}
	p->desc->pins = p->pads;
	p->desc->npins = p->max_pins;

	return 0;
}

int ralink_pinmux_init(struct platform_device *pdev,
		       struct ralink_pmx_group *data)
{
	struct ralink_priv *p;
	struct pinctrl_dev *dev;
	int err;

	if (!data)
		return -ENOTSUPP;

	/* setup the private data */
	p = devm_kzalloc(&pdev->dev, sizeof(struct ralink_priv), GFP_KERNEL);
	if (!p)
		return -ENOMEM;

	p->dev = &pdev->dev;
	p->desc = &ralink_pctrl_desc;
	p->groups = data;
	platform_set_drvdata(pdev, p);

	/* init the device */
	err = ralink_pinmux_index(p);
	if (err) {
		dev_err(&pdev->dev, "failed to load index\n");
		return err;
	}

	err = ralink_pinmux_pins(p);
	if (err) {
		dev_err(&pdev->dev, "failed to load pins\n");
		return err;
	}
	dev = pinctrl_register(p->desc, &pdev->dev, p);

	return PTR_ERR_OR_ZERO(dev);
}