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sfking@fdwdc.comaf39bb82009-06-19 18:11:00 -07001/*
2 * Coldfire generic GPIO support
3 *
4 * (C) Copyright 2009, Steven King <sfking@fdwdc.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14*/
15
16#ifndef coldfire_gpio_h
17#define coldfire_gpio_h
18
19#include <linux/io.h>
sfking@fdwdc.comaf39bb82009-06-19 18:11:00 -070020#include <asm/coldfire.h>
21#include <asm/mcfsim.h>
Steven Kingeac57942012-05-21 13:10:19 -070022#include <asm/mcfgpio.h>
sfking@fdwdc.comaf39bb82009-06-19 18:11:00 -070023/*
24 * The Generic GPIO functions
25 *
26 * If the gpio is a compile time constant and is one of the Coldfire gpios,
27 * use the inline version, otherwise dispatch thru gpiolib.
28 */
29
30static inline int gpio_get_value(unsigned gpio)
31{
32 if (__builtin_constant_p(gpio) && gpio < MCFGPIO_PIN_MAX)
Steven Kingeac57942012-05-21 13:10:19 -070033 return mcfgpio_read(__mcfgpio_ppdr(gpio)) & mcfgpio_bit(gpio);
sfking@fdwdc.comaf39bb82009-06-19 18:11:00 -070034 else
35 return __gpio_get_value(gpio);
36}
37
38static inline void gpio_set_value(unsigned gpio, int value)
39{
40 if (__builtin_constant_p(gpio) && gpio < MCFGPIO_PIN_MAX) {
41 if (gpio < MCFGPIO_SCR_START) {
42 unsigned long flags;
43 MCFGPIO_PORTTYPE data;
44
45 local_irq_save(flags);
Steven Kingeac57942012-05-21 13:10:19 -070046 data = mcfgpio_read(__mcfgpio_podr(gpio));
sfking@fdwdc.comaf39bb82009-06-19 18:11:00 -070047 if (value)
48 data |= mcfgpio_bit(gpio);
49 else
50 data &= ~mcfgpio_bit(gpio);
Steven Kingeac57942012-05-21 13:10:19 -070051 mcfgpio_write(data, __mcfgpio_podr(gpio));
sfking@fdwdc.comaf39bb82009-06-19 18:11:00 -070052 local_irq_restore(flags);
53 } else {
54 if (value)
55 mcfgpio_write(mcfgpio_bit(gpio),
56 MCFGPIO_SETR_PORT(gpio));
57 else
58 mcfgpio_write(~mcfgpio_bit(gpio),
59 MCFGPIO_CLRR_PORT(gpio));
60 }
61 } else
62 __gpio_set_value(gpio, value);
63}
64
65static inline int gpio_to_irq(unsigned gpio)
66{
Steven Kingbea8bcb2012-06-06 14:28:31 -070067#if defined(MCFGPIO_IRQ_MIN)
68 if ((gpio >= MCFGPIO_IRQ_MIN) && (gpio < MCFGPIO_IRQ_MAX))
69#else
70 if (gpio < MCFGPIO_IRQ_MAX)
71#endif
72 return gpio + MCFGPIO_IRQ_VECBASE;
73 else
74 return __gpio_to_irq(gpio);
sfking@fdwdc.comaf39bb82009-06-19 18:11:00 -070075}
76
77static inline int irq_to_gpio(unsigned irq)
78{
79 return (irq >= MCFGPIO_IRQ_VECBASE &&
80 irq < (MCFGPIO_IRQ_VECBASE + MCFGPIO_IRQ_MAX)) ?
81 irq - MCFGPIO_IRQ_VECBASE : -ENXIO;
82}
83
84static inline int gpio_cansleep(unsigned gpio)
85{
86 return gpio < MCFGPIO_PIN_MAX ? 0 : __gpio_cansleep(gpio);
87}
88
Greg Ungererb2dfaa82013-04-08 14:21:31 +100089static inline int gpio_request_one(unsigned gpio, unsigned long flags, const char *label)
90{
91 int err;
92
93 err = gpio_request(gpio, label);
94 if (err)
95 return err;
96
97 if (flags & GPIOF_DIR_IN)
98 err = gpio_direction_input(gpio);
99 else
100 err = gpio_direction_output(gpio,
101 (flags & GPIOF_INIT_HIGH) ? 1 : 0);
102
103 if (err)
104 gpio_free(gpio);
105
106 return err;
107}
108
sfking@fdwdc.comaf39bb82009-06-19 18:11:00 -0700109#endif