aboutsummaryrefslogtreecommitdiff
path: root/drivers/gpio/adi_gpio2.c
blob: d0849c85c3bc38f90f355479e12620b6c979b33b (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
/*
 * ADI GPIO2 Abstraction Layer
 * Support BF54x, BF60x and future processors.
 *
 * Copyright 2008-2013 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later
 */

#include <common.h>
#include <malloc.h>
#include <linux/bug.h>
#include <linux/errno.h>
#include <asm/gpio.h>

#define RESOURCE_LABEL_SIZE	16

static struct str_ident {
	char name[RESOURCE_LABEL_SIZE];
} str_ident[MAX_RESOURCES];

static void gpio_error(unsigned gpio)
{
	printf("adi_gpio2: GPIO %d wasn't requested!\n", gpio);
}

static void set_label(unsigned short ident, const char *label)
{
	if (label) {
		strncpy(str_ident[ident].name, label,
			RESOURCE_LABEL_SIZE);
		str_ident[ident].name[RESOURCE_LABEL_SIZE - 1] = 0;
	}
}

static char *get_label(unsigned short ident)
{
	return *str_ident[ident].name ? str_ident[ident].name : "UNKNOWN";
}

static int cmp_label(unsigned short ident, const char *label)
{
	if (label == NULL)
		printf("adi_gpio2: please provide none-null label\n");

	if (label)
		return strcmp(str_ident[ident].name, label);
	else
		return -EINVAL;
}

#define map_entry(m, i)      reserved_##m##_map[gpio_bank(i)]
#define is_reserved(m, i, e) (map_entry(m, i) & gpio_bit(i))
#define reserve(m, i)        (map_entry(m, i) |= gpio_bit(i))
#define unreserve(m, i)      (map_entry(m, i) &= ~gpio_bit(i))
#define DECLARE_RESERVED_MAP(m, c) unsigned short reserved_##m##_map[c]

static DECLARE_RESERVED_MAP(gpio, GPIO_BANK_NUM);
static DECLARE_RESERVED_MAP(peri, gpio_bank(MAX_RESOURCES));

inline int check_gpio(unsigned gpio)
{
#if defined(CONFIG_BF54x)
	if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15 ||
		gpio == GPIO_PH14 || gpio == GPIO_PH15 ||
		gpio == GPIO_PJ14 || gpio == GPIO_PJ15)
		return -EINVAL;
#endif
	if (gpio >= MAX_GPIOS)
		return -EINVAL;
	return 0;
}

static void port_setup(unsigned gpio, unsigned short usage)
{
#if defined(CONFIG_BF54x)
	if (usage == GPIO_USAGE)
		gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio);
	else
		gpio_array[gpio_bank(gpio)]->port_fer |= gpio_bit(gpio);
#else
	if (usage == GPIO_USAGE)
		gpio_array[gpio_bank(gpio)]->port_fer_clear = gpio_bit(gpio);
	else
		gpio_array[gpio_bank(gpio)]->port_fer_set = gpio_bit(gpio);
#endif
}

inline void portmux_setup(unsigned short per)
{
	u32 pmux;
	u16 ident = P_IDENT(per);
	u16 function = P_FUNCT2MUX(per);

	pmux = gpio_array[gpio_bank(ident)]->port_mux;

	pmux &= ~(0x3 << (2 * gpio_sub_n(ident)));
	pmux |= (function & 0x3) << (2 * gpio_sub_n(ident));

	gpio_array[gpio_bank(ident)]->port_mux = pmux;
}

inline u16 get_portmux(unsigned short per)
{
	u32 pmux;
	u16 ident = P_IDENT(per);

	pmux = gpio_array[gpio_bank(ident)]->port_mux;

	return pmux >> (2 * gpio_sub_n(ident)) & 0x3;
}

unsigned short get_gpio_dir(unsigned gpio)
{
	return 0x01 &
		(gpio_array[gpio_bank(gpio)]->dir_clear >> gpio_sub_n(gpio));
}

/***********************************************************
*
* FUNCTIONS:	Peripheral Resource Allocation
*		and PortMux Setup
*
* INPUTS/OUTPUTS:
* per	Peripheral Identifier
* label	String
*
* DESCRIPTION: Peripheral Resource Allocation and Setup API
**************************************************************/

int peripheral_request(unsigned short per, const char *label)
{
	unsigned short ident = P_IDENT(per);

	/*
	 * Don't cares are pins with only one dedicated function
	 */

	if (per & P_DONTCARE)
		return 0;

	if (!(per & P_DEFINED))
		return -EINVAL;

	BUG_ON(ident >= MAX_RESOURCES);

	/* If a pin can be muxed as either GPIO or peripheral, make
	 * sure it is not already a GPIO pin when we request it.
	 */
	if (unlikely(!check_gpio(ident) && is_reserved(gpio, ident, 1))) {
		printf("%s: Peripheral %d is already reserved as GPIO by %s!\n",
		       __func__, ident, get_label(ident));
		return -EBUSY;
	}

	if (unlikely(is_reserved(peri, ident, 1))) {
		/*
		 * Pin functions like AMC address strobes my
		 * be requested and used by several drivers
		 */

		if (!((per & P_MAYSHARE) &&
			get_portmux(per) == P_FUNCT2MUX(per))) {
			/*
			 * Allow that the identical pin function can
			 * be requested from the same driver twice
			 */

			if (cmp_label(ident, label) == 0)
				goto anyway;

			printf("%s: Peripheral %d function %d is already "
				"reserved by %s!\n", __func__, ident,
				P_FUNCT2MUX(per), get_label(ident));
			return -EBUSY;
		}
	}

 anyway:
	reserve(peri, ident);

	portmux_setup(per);
	port_setup(ident, PERIPHERAL_USAGE);

	set_label(ident, label);

	return 0;
}

int peripheral_request_list(const unsigned short per[], const char *label)
{
	u16 cnt;
	int ret;

	for (cnt = 0; per[cnt] != 0; cnt++) {
		ret = peripheral_request(per[cnt], label);

		if (ret < 0) {
			for (; cnt > 0; cnt--)
				peripheral_free(per[cnt - 1]);

			return ret;
		}
	}

	return 0;
}

void peripheral_free(unsigned short per)
{
	unsigned short ident = P_IDENT(per);

	if (per & P_DONTCARE)
		return;

	if (!(per & P_DEFINED))
		return;

	if (unlikely(!is_reserved(peri, ident, 0)))
		return;

	if (!(per & P_MAYSHARE))
		port_setup(ident, GPIO_USAGE);

	unreserve(peri, ident);

	set_label(ident, "free");
}

void peripheral_free_list(const unsigned short per[])
{
	u16 cnt;
	for (cnt = 0; per[cnt] != 0; cnt++)
		peripheral_free(per[cnt]);
}

/***********************************************************
*
* FUNCTIONS: GPIO Driver
*
* INPUTS/OUTPUTS:
* gpio	PIO Number between 0 and MAX_GPIOS
* label	String
*
* DESCRIPTION: GPIO Driver API
**************************************************************/

int gpio_request(unsigned gpio, const char *label)
{
	if (check_gpio(gpio) < 0)
		return -EINVAL;

	/*
	 * Allow that the identical GPIO can
	 * be requested from the same driver twice
	 * Do nothing and return -
	 */

	if (cmp_label(gpio, label) == 0)
		return 0;

	if (unlikely(is_reserved(gpio, gpio, 1))) {
		printf("adi_gpio2: GPIO %d is already reserved by %s!\n",
			gpio, get_label(gpio));
		return -EBUSY;
	}
	if (unlikely(is_reserved(peri, gpio, 1))) {
		printf("adi_gpio2: GPIO %d is already reserved as Peripheral "
			"by %s!\n", gpio, get_label(gpio));
		return -EBUSY;
	}

	reserve(gpio, gpio);
	set_label(gpio, label);

	port_setup(gpio, GPIO_USAGE);

	return 0;
}

int gpio_free(unsigned gpio)
{
	if (check_gpio(gpio) < 0)
		return -1;

	if (unlikely(!is_reserved(gpio, gpio, 0))) {
		gpio_error(gpio);
		return -1;
	}

	unreserve(gpio, gpio);

	set_label(gpio, "free");

	return 0;
}

#ifdef ADI_SPECIAL_GPIO_BANKS
static DECLARE_RESERVED_MAP(special_gpio, gpio_bank(MAX_RESOURCES));

int special_gpio_request(unsigned gpio, const char *label)
{
	/*
	 * Allow that the identical GPIO can
	 * be requested from the same driver twice
	 * Do nothing and return -
	 */

	if (cmp_label(gpio, label) == 0)
		return 0;

	if (unlikely(is_reserved(special_gpio, gpio, 1))) {
		printf("adi_gpio2: GPIO %d is already reserved by %s!\n",
			gpio, get_label(gpio));
		return -EBUSY;
	}
	if (unlikely(is_reserved(peri, gpio, 1))) {
		printf("adi_gpio2: GPIO %d is already reserved as Peripheral "
			"by %s!\n", gpio, get_label(gpio));

		return -EBUSY;
	}

	reserve(special_gpio, gpio);
	reserve(peri, gpio);

	set_label(gpio, label);
	port_setup(gpio, GPIO_USAGE);

	return 0;
}

void special_gpio_free(unsigned gpio)
{
	if (unlikely(!is_reserved(special_gpio, gpio, 0))) {
		gpio_error(gpio);
		return;
	}

	unreserve(special_gpio, gpio);
	unreserve(peri, gpio);
	set_label(gpio, "free");
}
#endif

static inline void __gpio_direction_input(unsigned gpio)
{
	gpio_array[gpio_bank(gpio)]->dir_clear = gpio_bit(gpio);
#if defined(CONFIG_BF54x)
	gpio_array[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
#else
	gpio_array[gpio_bank(gpio)]->inen_set = gpio_bit(gpio);
#endif
}

int gpio_direction_input(unsigned gpio)
{
	unsigned long flags;

	if (!is_reserved(gpio, gpio, 0)) {
		gpio_error(gpio);
		return -EINVAL;
	}

	local_irq_save(flags);
	__gpio_direction_input(gpio);
	local_irq_restore(flags);

	return 0;
}

int gpio_set_value(unsigned gpio, int arg)
{
	if (arg)
		gpio_array[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
	else
		gpio_array[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);

	return 0;
}

int gpio_direction_output(unsigned gpio, int value)
{
	unsigned long flags;

	if (!is_reserved(gpio, gpio, 0)) {
		gpio_error(gpio);
		return -EINVAL;
	}

	local_irq_save(flags);

#if defined(CONFIG_BF54x)
	gpio_array[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
#else
	gpio_array[gpio_bank(gpio)]->inen_clear = gpio_bit(gpio);
#endif
	gpio_set_value(gpio, value);
	gpio_array[gpio_bank(gpio)]->dir_set = gpio_bit(gpio);

	local_irq_restore(flags);

	return 0;
}

int gpio_get_value(unsigned gpio)
{
	return 1 & (gpio_array[gpio_bank(gpio)]->data >> gpio_sub_n(gpio));
}

void gpio_labels(void)
{
	int c, gpio;

	for (c = 0; c < MAX_RESOURCES; c++) {
		gpio = is_reserved(gpio, c, 1);
		if (!check_gpio(c) && gpio)
			printf("GPIO_%d:\t%s\tGPIO %s\n", c, get_label(c),
				get_gpio_dir(c) ? "OUTPUT" : "INPUT");
		else if (is_reserved(peri, c, 1))
			printf("GPIO_%d:\t%s\tPeripheral\n", c, get_label(c));
		else
			continue;
	}
}