2 * Coldfire generic GPIO support.
4 * (C) Copyright 2009, Steven King <sfking@fdwdc.com>
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.
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.
20 #include <asm-generic/gpio.h>
22 struct mcf_gpio_chip {
23 struct gpio_chip gpio_chip;
29 const u8 *gpio_to_pinmux;
32 int mcf_gpio_direction_input(struct gpio_chip *, unsigned);
33 int mcf_gpio_get_value(struct gpio_chip *, unsigned);
34 int mcf_gpio_direction_output(struct gpio_chip *, unsigned, int);
35 void mcf_gpio_set_value(struct gpio_chip *, unsigned, int);
36 void mcf_gpio_set_value_fast(struct gpio_chip *, unsigned, int);
37 int mcf_gpio_request(struct gpio_chip *, unsigned);
38 void mcf_gpio_free(struct gpio_chip *, unsigned);
41 * Define macros to ease the pain of setting up the GPIO tables. There
42 * are two cases we need to deal with here, they cover all currently
43 * available ColdFire GPIO hardware. There are of course minor differences
44 * in the layout and number of bits in each ColdFire part, but the macros
47 * Firstly is the conventional GPIO registers where we toggle individual
48 * bits in a register, preserving the other bits in the register. For
49 * lack of a better term I have called this the slow method.
51 #define MCFGPS(mlabel, mbase, mngpio, mpddr, mpodr, mppdr) \
55 .request = mcf_gpio_request, \
56 .free = mcf_gpio_free, \
57 .direction_input = mcf_gpio_direction_input, \
58 .direction_output = mcf_gpio_direction_output,\
59 .get = mcf_gpio_get_value, \
60 .set = mcf_gpio_set_value, \
64 .pddr = (void __iomem *) mpddr, \
65 .podr = (void __iomem *) mpodr, \
66 .ppdr = (void __iomem *) mppdr, \
70 * Secondly is the faster case, where we have set and clear registers
71 * that allow us to set or clear a bit with a single write, not having
72 * to worry about preserving other bits.
74 #define MCFGPF(mlabel, mbase, mngpio) \
78 .request = mcf_gpio_request, \
79 .free = mcf_gpio_free, \
80 .direction_input = mcf_gpio_direction_input, \
81 .direction_output = mcf_gpio_direction_output,\
82 .get = mcf_gpio_get_value, \
83 .set = mcf_gpio_set_value_fast, \
87 .pddr = (void __iomem *) MCFGPIO_PDDR_##mlabel, \
88 .podr = (void __iomem *) MCFGPIO_PODR_##mlabel, \
89 .ppdr = (void __iomem *) MCFGPIO_PPDSDR_##mlabel, \
90 .setr = (void __iomem *) MCFGPIO_PPDSDR_##mlabel, \
91 .clrr = (void __iomem *) MCFGPIO_PCLRR_##mlabel, \