arch/mips/alchemy/common/gpiolib.c

   1 /*
   2  *  Copyright (C) 2007-2009, OpenWrt.org, Florian Fainelli <florian@openwrt.org>
   3  *      GPIOLIB support for Alchemy chips.
   4  *
   5  *  This program is free software; you can redistribute  it and/or modify it
   6  *  under  the terms of  the GNU General  Public License as published by the
   7  *  Free Software Foundation;  either version 2 of the  License, or (at your
   8  *  option) any later version.
   9  *
  10  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  11  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  12  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  13  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  14  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  15  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  16  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  17  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  18  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  19  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  20  *
  21  *  You should have received a copy of the  GNU General Public License along
  22  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  23  *  675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  *  Notes :
  26  *      This file must ONLY be built when CONFIG_GPIOLIB=y and
  27  *       CONFIG_ALCHEMY_GPIO_INDIRECT=n, otherwise compilation will fail!
  28  *      au1000 SoC have only one GPIO block : GPIO1
  29  *      Au1100, Au15x0, Au12x0 have a second one : GPIO2
  30  *      Au1300 is totally different: 1 block with up to 128 GPIOs
  31  */
  32
  33 #include <linux/init.h>
  34 #include <linux/kernel.h>
  35 #include <linux/types.h>
  36 #include <linux/gpio.h>
  37 #include <asm/mach-au1x00/gpio-au1000.h>
  38 #include <asm/mach-au1x00/gpio-au1300.h>
  39
  40 static int gpio2_get(struct gpio_chip *chip, unsigned offset)
  41 {
  42         return !!alchemy_gpio2_get_value(offset + ALCHEMY_GPIO2_BASE);
  43 }
  44
  45 static void gpio2_set(struct gpio_chip *chip, unsigned offset, int value)
  46 {
  47         alchemy_gpio2_set_value(offset + ALCHEMY_GPIO2_BASE, value);
  48 }
  49
  50 static int gpio2_direction_input(struct gpio_chip *chip, unsigned offset)
  51 {
  52         return alchemy_gpio2_direction_input(offset + ALCHEMY_GPIO2_BASE);
  53 }
  54
  55 static int gpio2_direction_output(struct gpio_chip *chip, unsigned offset,
  56                                   int value)
  57 {
  58         return alchemy_gpio2_direction_output(offset + ALCHEMY_GPIO2_BASE,
  59                                                 value);
  60 }
  61
  62 static int gpio2_to_irq(struct gpio_chip *chip, unsigned offset)
  63 {
  64         return alchemy_gpio2_to_irq(offset + ALCHEMY_GPIO2_BASE);
  65 }
  66
  67
  68 static int gpio1_get(struct gpio_chip *chip, unsigned offset)
  69 {
  70         return !!alchemy_gpio1_get_value(offset + ALCHEMY_GPIO1_BASE);
  71 }
  72
  73 static void gpio1_set(struct gpio_chip *chip,
  74                                 unsigned offset, int value)
  75 {
  76         alchemy_gpio1_set_value(offset + ALCHEMY_GPIO1_BASE, value);
  77 }
  78
  79 static int gpio1_direction_input(struct gpio_chip *chip, unsigned offset)
  80 {
  81         return alchemy_gpio1_direction_input(offset + ALCHEMY_GPIO1_BASE);
  82 }
  83
  84 static int gpio1_direction_output(struct gpio_chip *chip,
  85                                         unsigned offset, int value)
  86 {
  87         return alchemy_gpio1_direction_output(offset + ALCHEMY_GPIO1_BASE,
  88                                              value);
  89 }
  90
  91 static int gpio1_to_irq(struct gpio_chip *chip, unsigned offset)
  92 {
  93         return alchemy_gpio1_to_irq(offset + ALCHEMY_GPIO1_BASE);
  94 }
  95
  96 struct gpio_chip alchemy_gpio_chip[] = {
  97         [0] = {
  98                 .label                  = "alchemy-gpio1",
  99                 .direction_input        = gpio1_direction_input,
 100                 .direction_output       = gpio1_direction_output,
 101                 .get                    = gpio1_get,
 102                 .set                    = gpio1_set,
 103                 .to_irq                 = gpio1_to_irq,
 104                 .base                   = ALCHEMY_GPIO1_BASE,
 105                 .ngpio                  = ALCHEMY_GPIO1_NUM,
 106         },
 107         [1] = {
 108                 .label                  = "alchemy-gpio2",
 109                 .direction_input        = gpio2_direction_input,
 110                 .direction_output       = gpio2_direction_output,
 111                 .get                    = gpio2_get,
 112                 .set                    = gpio2_set,
 113                 .to_irq                 = gpio2_to_irq,
 114                 .base                   = ALCHEMY_GPIO2_BASE,
 115                 .ngpio                  = ALCHEMY_GPIO2_NUM,
 116         },
 117 };
 118
 119 static int alchemy_gpic_get(struct gpio_chip *chip, unsigned int off)
 120 {
 121         return !!au1300_gpio_get_value(off + AU1300_GPIO_BASE);
 122 }
 123
 124 static void alchemy_gpic_set(struct gpio_chip *chip, unsigned int off, int v)
 125 {
 126         au1300_gpio_set_value(off + AU1300_GPIO_BASE, v);
 127 }
 128
 129 static int alchemy_gpic_dir_input(struct gpio_chip *chip, unsigned int off)
 130 {
 131         return au1300_gpio_direction_input(off + AU1300_GPIO_BASE);
 132 }
 133
 134 static int alchemy_gpic_dir_output(struct gpio_chip *chip, unsigned int off,
 135                                    int v)
 136 {
 137         return au1300_gpio_direction_output(off + AU1300_GPIO_BASE, v);
 138 }
 139
 140 static int alchemy_gpic_gpio_to_irq(struct gpio_chip *chip, unsigned int off)
 141 {
 142         return au1300_gpio_to_irq(off + AU1300_GPIO_BASE);
 143 }
 144
 145 static struct gpio_chip au1300_gpiochip = {
 146         .label                  = "alchemy-gpic",
 147         .direction_input        = alchemy_gpic_dir_input,
 148         .direction_output       = alchemy_gpic_dir_output,
 149         .get                    = alchemy_gpic_get,
 150         .set                    = alchemy_gpic_set,
 151         .to_irq                 = alchemy_gpic_gpio_to_irq,
 152         .base                   = AU1300_GPIO_BASE,
 153         .ngpio                  = AU1300_GPIO_NUM,
 154 };
 155
 156 static int __init alchemy_gpiochip_init(void)
 157 {
 158         int ret = 0;
 159
 160         switch (alchemy_get_cputype()) {
 161         case ALCHEMY_CPU_AU1000:
 162                 ret = gpiochip_add_data(&alchemy_gpio_chip[0], NULL);
 163                 break;
 164         case ALCHEMY_CPU_AU1500...ALCHEMY_CPU_AU1200:
 165                 ret = gpiochip_add_data(&alchemy_gpio_chip[0], NULL);
 166                 ret |= gpiochip_add_data(&alchemy_gpio_chip[1], NULL);
 167                 break;
 168         case ALCHEMY_CPU_AU1300:
 169                 ret = gpiochip_add_data(&au1300_gpiochip, NULL);
 170                 break;
 171         }
 172         return ret;
 173 }
 174 arch_initcall(alchemy_gpiochip_init);