blob: 45f0996a375231be24109df39f89d1ee707e1f21 [file] [log] [blame]
Hauke Mehrtenscf0936b2012-11-20 22:24:30 +00001/*
2 * Broadcom specific AMBA
3 * GPIO driver
4 *
5 * Copyright 2011, Broadcom Corporation
6 * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
7 *
8 * Licensed under the GNU/GPL. See COPYING for details.
9 */
10
11#include <linux/gpio.h>
12#include <linux/export.h>
13#include <linux/bcma/bcma.h>
14
15#include "bcma_private.h"
16
17static inline struct bcma_drv_cc *bcma_gpio_get_cc(struct gpio_chip *chip)
18{
19 return container_of(chip, struct bcma_drv_cc, gpio);
20}
21
22static int bcma_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
23{
24 struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
25
26 return !!bcma_chipco_gpio_in(cc, 1 << gpio);
27}
28
29static void bcma_gpio_set_value(struct gpio_chip *chip, unsigned gpio,
30 int value)
31{
32 struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
33
34 bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
35}
36
37static int bcma_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
38{
39 struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
40
41 bcma_chipco_gpio_outen(cc, 1 << gpio, 0);
42 return 0;
43}
44
45static int bcma_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
46 int value)
47{
48 struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
49
50 bcma_chipco_gpio_outen(cc, 1 << gpio, 1 << gpio);
51 bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
52 return 0;
53}
54
55static int bcma_gpio_request(struct gpio_chip *chip, unsigned gpio)
56{
57 struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
58
59 bcma_chipco_gpio_control(cc, 1 << gpio, 0);
60 /* clear pulldown */
61 bcma_chipco_gpio_pulldown(cc, 1 << gpio, 0);
62 /* Set pullup */
63 bcma_chipco_gpio_pullup(cc, 1 << gpio, 1 << gpio);
64
65 return 0;
66}
67
68static void bcma_gpio_free(struct gpio_chip *chip, unsigned gpio)
69{
70 struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
71
72 /* clear pullup */
73 bcma_chipco_gpio_pullup(cc, 1 << gpio, 0);
74}
75
Hauke Mehrtens8f1ca262013-01-26 21:39:44 +010076static int bcma_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
77{
78 struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
79
80 if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
81 return bcma_core_irq(cc->core);
82 else
83 return -EINVAL;
84}
85
Hauke Mehrtenscf0936b2012-11-20 22:24:30 +000086int bcma_gpio_init(struct bcma_drv_cc *cc)
87{
88 struct gpio_chip *chip = &cc->gpio;
89
90 chip->label = "bcma_gpio";
91 chip->owner = THIS_MODULE;
92 chip->request = bcma_gpio_request;
93 chip->free = bcma_gpio_free;
94 chip->get = bcma_gpio_get_value;
95 chip->set = bcma_gpio_set_value;
96 chip->direction_input = bcma_gpio_direction_input;
97 chip->direction_output = bcma_gpio_direction_output;
Hauke Mehrtens8f1ca262013-01-26 21:39:44 +010098 chip->to_irq = bcma_gpio_to_irq;
Hauke Mehrtenscf0936b2012-11-20 22:24:30 +000099 chip->ngpio = 16;
100 /* There is just one SoC in one device and its GPIO addresses should be
101 * deterministic to address them more easily. The other buses could get
102 * a random base number. */
103 if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
104 chip->base = 0;
105 else
106 chip->base = -1;
107
108 return gpiochip_add(chip);
109}
Hauke Mehrtensc50ae942013-02-03 23:25:33 +0100110
111int bcma_gpio_unregister(struct bcma_drv_cc *cc)
112{
113 return gpiochip_remove(&cc->gpio);
114}