2 * Broadcom specific AMBA
5 * Copyright 2011, Broadcom Corporation
6 * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
8 * Licensed under the GNU/GPL. See COPYING for details.
11 #include <linux/gpio.h>
12 #include <linux/export.h>
13 #include <linux/bcma/bcma.h>
15 #include "bcma_private.h"
17 static inline struct bcma_drv_cc
*bcma_gpio_get_cc(struct gpio_chip
*chip
)
19 return container_of(chip
, struct bcma_drv_cc
, gpio
);
22 static int bcma_gpio_get_value(struct gpio_chip
*chip
, unsigned gpio
)
24 struct bcma_drv_cc
*cc
= bcma_gpio_get_cc(chip
);
26 return !!bcma_chipco_gpio_in(cc
, 1 << gpio
);
29 static void bcma_gpio_set_value(struct gpio_chip
*chip
, unsigned gpio
,
32 struct bcma_drv_cc
*cc
= bcma_gpio_get_cc(chip
);
34 bcma_chipco_gpio_out(cc
, 1 << gpio
, value
? 1 << gpio
: 0);
37 static int bcma_gpio_direction_input(struct gpio_chip
*chip
, unsigned gpio
)
39 struct bcma_drv_cc
*cc
= bcma_gpio_get_cc(chip
);
41 bcma_chipco_gpio_outen(cc
, 1 << gpio
, 0);
45 static int bcma_gpio_direction_output(struct gpio_chip
*chip
, unsigned gpio
,
48 struct bcma_drv_cc
*cc
= bcma_gpio_get_cc(chip
);
50 bcma_chipco_gpio_outen(cc
, 1 << gpio
, 1 << gpio
);
51 bcma_chipco_gpio_out(cc
, 1 << gpio
, value
? 1 << gpio
: 0);
55 static int bcma_gpio_request(struct gpio_chip
*chip
, unsigned gpio
)
57 struct bcma_drv_cc
*cc
= bcma_gpio_get_cc(chip
);
59 bcma_chipco_gpio_control(cc
, 1 << gpio
, 0);
61 bcma_chipco_gpio_pulldown(cc
, 1 << gpio
, 0);
63 bcma_chipco_gpio_pullup(cc
, 1 << gpio
, 1 << gpio
);
68 static void bcma_gpio_free(struct gpio_chip
*chip
, unsigned gpio
)
70 struct bcma_drv_cc
*cc
= bcma_gpio_get_cc(chip
);
73 bcma_chipco_gpio_pullup(cc
, 1 << gpio
, 0);
76 int bcma_gpio_init(struct bcma_drv_cc
*cc
)
78 struct gpio_chip
*chip
= &cc
->gpio
;
80 chip
->label
= "bcma_gpio";
81 chip
->owner
= THIS_MODULE
;
82 chip
->request
= bcma_gpio_request
;
83 chip
->free
= bcma_gpio_free
;
84 chip
->get
= bcma_gpio_get_value
;
85 chip
->set
= bcma_gpio_set_value
;
86 chip
->direction_input
= bcma_gpio_direction_input
;
87 chip
->direction_output
= bcma_gpio_direction_output
;
89 /* There is just one SoC in one device and its GPIO addresses should be
90 * deterministic to address them more easily. The other buses could get
91 * a random base number. */
92 if (cc
->core
->bus
->hosttype
== BCMA_HOSTTYPE_SOC
)
97 return gpiochip_add(chip
);