aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-mxs/gpio.c
blob: d7ad7a61366d80b33f9058bbf8d8c21f98789619 (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
/*
 * MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de>
 * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
 *
 * Based on code from Freescale,
 * Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA  02110-1301, USA.
 */

#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <mach/mx23.h>
#include <mach/mx28.h>
#include <asm-generic/bug.h>

#include "gpio.h"

static struct mxs_gpio_port *mxs_gpio_ports;
static int gpio_table_size;

#define PINCTRL_DOUT(n)		((cpu_is_mx23() ? 0x0500 : 0x0700) + (n) * 0x10)
#define PINCTRL_DIN(n)		((cpu_is_mx23() ? 0x0600 : 0x0900) + (n) * 0x10)
#define PINCTRL_DOE(n)		((cpu_is_mx23() ? 0x0700 : 0x0b00) + (n) * 0x10)
#define PINCTRL_PIN2IRQ(n)	((cpu_is_mx23() ? 0x0800 : 0x1000) + (n) * 0x10)
#define PINCTRL_IRQEN(n)	((cpu_is_mx23() ? 0x0900 : 0x1100) + (n) * 0x10)
#define PINCTRL_IRQLEV(n)	((cpu_is_mx23() ? 0x0a00 : 0x1200) + (n) * 0x10)
#define PINCTRL_IRQPOL(n)	((cpu_is_mx23() ? 0x0b00 : 0x1300) + (n) * 0x10)
#define PINCTRL_IRQSTAT(n)	((cpu_is_mx23() ? 0x0c00 : 0x1400) + (n) * 0x10)

#define GPIO_INT_FALL_EDGE	0x0
#define GPIO_INT_LOW_LEV	0x1
#define GPIO_INT_RISE_EDGE	0x2
#define GPIO_INT_HIGH_LEV	0x3
#define GPIO_INT_LEV_MASK	(1 << 0)
#define GPIO_INT_POL_MASK	(1 << 1)

/* Note: This driver assumes 32 GPIOs are handled in one register */

static void clear_gpio_irqstatus(struct mxs_gpio_port *port, u32 index)
{
	__mxs_clrl(1 << index, port->base + PINCTRL_IRQSTAT(port->id));
}

static void set_gpio_irqenable(struct mxs_gpio_port *port, u32 index,
				int enable)
{
	if (enable) {
		__mxs_setl(1 << index, port->base + PINCTRL_IRQEN(port->id));
		__mxs_setl(1 << index, port->base + PINCTRL_PIN2IRQ(port->id));
	} else {
		__mxs_clrl(1 << index, port->base + PINCTRL_IRQEN(port->id));
	}
}

static void mxs_gpio_ack_irq(u32 irq)
{
	u32 gpio = irq_to_gpio(irq);
	clear_gpio_irqstatus(&mxs_gpio_ports[gpio / 32], gpio & 0x1f);
}

static void mxs_gpio_mask_irq(u32 irq)
{
	u32 gpio = irq_to_gpio(irq);
	set_gpio_irqenable(&mxs_gpio_ports[gpio / 32], gpio & 0x1f, 0);
}

static void mxs_gpio_unmask_irq(u32 irq)
{
	u32 gpio = irq_to_gpio(irq);
	set_gpio_irqenable(&mxs_gpio_ports[gpio / 32], gpio & 0x1f, 1);
}

static int mxs_gpio_get(struct gpio_chip *chip, unsigned offset);

static int mxs_gpio_set_irq_type(u32 irq, u32 type)
{
	u32 gpio = irq_to_gpio(irq);
	u32 pin_mask = 1 << (gpio & 31);
	struct mxs_gpio_port *port = &mxs_gpio_ports[gpio / 32];
	void __iomem *pin_addr;
	int edge;

	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
		edge = GPIO_INT_RISE_EDGE;
		break;
	case IRQ_TYPE_EDGE_FALLING:
		edge = GPIO_INT_FALL_EDGE;
		break;
	case IRQ_TYPE_LEVEL_LOW:
		edge = GPIO_INT_LOW_LEV;
		break;
	case IRQ_TYPE_LEVEL_HIGH:
		edge = GPIO_INT_HIGH_LEV;
		break;
	default:
		return -EINVAL;
	}

	/* set level or edge */
	pin_addr = port->base + PINCTRL_IRQLEV(port->id);
	if (edge & GPIO_INT_LEV_MASK)
		__mxs_setl(pin_mask, pin_addr);
	else
		__mxs_clrl(pin_mask, pin_addr);

	/* set polarity */
	pin_addr = port->base + PINCTRL_IRQPOL(port->id);
	if (edge & GPIO_INT_POL_MASK)
		__mxs_setl(pin_mask, pin_addr);
	else
		__mxs_clrl(pin_mask, pin_addr);

	clear_gpio_irqstatus(port, gpio & 0x1f);

	return 0;
}

/* MXS has one interrupt *per* gpio port */
static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
{
	u32 irq_stat;
	struct mxs_gpio_port *port = (struct mxs_gpio_port *)get_irq_data(irq);
	u32 gpio_irq_no_base = port->virtual_irq_start;

	irq_stat = __raw_readl(port->base + PINCTRL_IRQSTAT(port->id)) &
			__raw_readl(port->base + PINCTRL_IRQEN(port->id));

	while (irq_stat != 0) {
		int irqoffset = fls(irq_stat) - 1;
		generic_handle_irq(gpio_irq_no_base + irqoffset);
		irq_stat &= ~(1 << irqoffset);
	}
}

/*
 * Set interrupt number "irq" in the GPIO as a wake-up source.
 * While system is running, all registered GPIO interrupts need to have
 * wake-up enabled. When system is suspended, only selected GPIO interrupts
 * need to have wake-up enabled.
 * @param  irq          interrupt source number
 * @param  enable       enable as wake-up if equal to non-zero
 * @return       This function returns 0 on success.
 */
static int mxs_gpio_set_wake_irq(u32 irq, u32 enable)
{
	u32 gpio = irq_to_gpio(irq);
	u32 gpio_idx = gpio & 0x1f;
	struct mxs_gpio_port *port = &mxs_gpio_ports[gpio / 32];

	if (enable) {
		if (port->irq_high && (gpio_idx >= 16))
			enable_irq_wake(port->irq_high);
		else
			enable_irq_wake(port->irq);
	} else {
		if (port->irq_high && (gpio_idx >= 16))
			disable_irq_wake(port->irq_high);
		else
			disable_irq_wake(port->irq);
	}

	return 0;
}

static struct irq_chip gpio_irq_chip = {
	.ack = mxs_gpio_ack_irq,
	.mask = mxs_gpio_mask_irq,
	.unmask = mxs_gpio_unmask_irq,
	.set_type = mxs_gpio_set_irq_type,
	.set_wake = mxs_gpio_set_wake_irq,
};

static void mxs_set_gpio_direction(struct gpio_chip *chip, unsigned offset,
				int dir)
{
	struct mxs_gpio_port *port =
		container_of(chip, struct mxs_gpio_port, chip);
	void __iomem *pin_addr = port->base + PINCTRL_DOE(port->id);

	if (dir)
		__mxs_setl(1 << offset, pin_addr);
	else
		__mxs_clrl(1 << offset, pin_addr);
}

static int mxs_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct mxs_gpio_port *port =
		container_of(chip, struct mxs_gpio_port, chip);

	return (__raw_readl(port->base + PINCTRL_DIN(port->id)) >> offset) & 1;
}

static void mxs_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct mxs_gpio_port *port =
		container_of(chip, struct mxs_gpio_port, chip);
	void __iomem *pin_addr = port->base + PINCTRL_DOUT(port->id);

	if (value)
		__mxs_setl(1 << offset, pin_addr);
	else
		__mxs_clrl(1 << offset, pin_addr);
}

static int mxs_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
	struct mxs_gpio_port *port =
		container_of(chip, struct mxs_gpio_port, chip);

	return port->virtual_irq_start + offset;
}

static int mxs_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
	mxs_set_gpio_direction(chip, offset, 0);
	return 0;
}

static int mxs_gpio_direction_output(struct gpio_chip *chip,
				     unsigned offset, int value)
{
	mxs_gpio_set(chip, offset, value);
	mxs_set_gpio_direction(chip, offset, 1);
	return 0;
}

int __init mxs_gpio_init(struct mxs_gpio_port *port, int cnt)
{
	int i, j;

	/* save for local usage */
	mxs_gpio_ports = port;
	gpio_table_size = cnt;

	pr_info("MXS GPIO hardware\n");

	for (i = 0; i < cnt; i++) {
		/* disable the interrupt and clear the status */
		__raw_writel(0, port[i].base + PINCTRL_PIN2IRQ(i));
		__raw_writel(0, port[i].base + PINCTRL_IRQEN(i));

		/* clear address has to be used to clear IRQSTAT bits */
		__mxs_clrl(~0U, port[i].base + PINCTRL_IRQSTAT(i));

		for (j = port[i].virtual_irq_start;
			j < port[i].virtual_irq_start + 32; j++) {
			set_irq_chip(j, &gpio_irq_chip);
			set_irq_handler(j, handle_level_irq);
			set_irq_flags(j, IRQF_VALID);
		}

		/* setup one handler for each entry */
		set_irq_chained_handler(port[i].irq, mxs_gpio_irq_handler);
		set_irq_data(port[i].irq, &port[i]);

		/* register gpio chip */
		port[i].chip.direction_input = mxs_gpio_direction_input;
		port[i].chip.direction_output = mxs_gpio_direction_output;
		port[i].chip.get = mxs_gpio_get;
		port[i].chip.set = mxs_gpio_set;
		port[i].chip.to_irq = mxs_gpio_to_irq;
		port[i].chip.base = i * 32;
		port[i].chip.ngpio = 32;

		/* its a serious configuration bug when it fails */
		BUG_ON(gpiochip_add(&port[i].chip) < 0);
	}

	return 0;
}

#define DEFINE_MXS_GPIO_PORT(soc, _id)					\
	{								\
		.chip.label = "gpio-" #_id,				\
		.id = _id,						\
		.irq = soc ## _INT_GPIO ## _id,				\
		.base = soc ## _IO_ADDRESS(				\
				soc ## _PINCTRL ## _BASE_ADDR),		\
		.virtual_irq_start = MXS_GPIO_IRQ_START + (_id) * 32,	\
	}

#define DEFINE_REGISTER_FUNCTION(prefix)				\
int __init prefix ## _register_gpios(void)				\
{									\
	return mxs_gpio_init(prefix ## _gpio_ports,			\
			ARRAY_SIZE(prefix ## _gpio_ports));		\
}

#ifdef CONFIG_SOC_IMX23
static struct mxs_gpio_port mx23_gpio_ports[] = {
	DEFINE_MXS_GPIO_PORT(MX23, 0),
	DEFINE_MXS_GPIO_PORT(MX23, 1),
	DEFINE_MXS_GPIO_PORT(MX23, 2),
};
DEFINE_REGISTER_FUNCTION(mx23)
#endif

#ifdef CONFIG_SOC_IMX28
static struct mxs_gpio_port mx28_gpio_ports[] = {
	DEFINE_MXS_GPIO_PORT(MX28, 0),
	DEFINE_MXS_GPIO_PORT(MX28, 1),
	DEFINE_MXS_GPIO_PORT(MX28, 2),
	DEFINE_MXS_GPIO_PORT(MX28, 3),
	DEFINE_MXS_GPIO_PORT(MX28, 4),
};
DEFINE_REGISTER_FUNCTION(mx28)
#endif