arch/mips/au1000/common/gpio.c

   1 /*
   2  *  Copyright (C) 2007, OpenWrt.org, Florian Fainelli <florian@openwrt.org>
   3  *      Architecture specific GPIO support
   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  *      au1000 SoC have only one GPIO line : GPIO1
  27  *      others have a second one : GPIO2
  28  */
  29
  30 #include <linux/autoconf.h>
  31 #include <linux/init.h>
  32 #include <linux/io.h>
  33 #include <linux/types.h>
  34 #include <linux/module.h>
  35
  36 #include <asm/addrspace.h>
  37
  38 #include <asm/mach-au1x00/au1000.h>
  39 #include <asm/gpio.h>
  40
  41 #define gpio1 sys
  42 #if !defined(CONFIG_SOC_AU1000)
  43
  44 static struct au1x00_gpio2 *const gpio2 = (struct au1x00_gpio2 *) GPIO2_BASE;
  45 #define GPIO2_OUTPUT_ENABLE_MASK        0x00010000
  46
  47 static int au1xxx_gpio2_read(unsigned gpio)
  48 {
  49         gpio -= AU1XXX_GPIO_BASE;
  50         return ((gpio2->pinstate >> gpio) & 0x01);
  51 }
  52
  53 static void au1xxx_gpio2_write(unsigned gpio, int value)
  54 {
  55         gpio -= AU1XXX_GPIO_BASE;
  56
  57         gpio2->output = (GPIO2_OUTPUT_ENABLE_MASK << gpio) | (value << gpio);
  58 }
  59
  60 static int au1xxx_gpio2_direction_input(unsigned gpio)
  61 {
  62         gpio -= AU1XXX_GPIO_BASE;
  63         gpio2->dir &= ~(0x01 << gpio);
  64         return 0;
  65 }
  66
  67 static int au1xxx_gpio2_direction_output(unsigned gpio, int value)
  68 {
  69         gpio -= AU1XXX_GPIO_BASE;
  70         gpio2->dir = (0x01 << gpio) | (value << gpio);
  71         return 0;
  72 }
  73
  74 #endif /* !defined(CONFIG_SOC_AU1000) */
  75
  76 static int au1xxx_gpio1_read(unsigned gpio)
  77 {
  78         return ((gpio1->pinstaterd >> gpio) & 0x01);
  79 }
  80
  81 static void au1xxx_gpio1_write(unsigned gpio, int value)
  82 {
  83         if (value)
  84                 gpio1->outputset = (0x01 << gpio);
  85         else
  86                 /* Output a zero */
  87                 gpio1->outputclr = (0x01 << gpio);
  88 }
  89
  90 static int au1xxx_gpio1_direction_input(unsigned gpio)
  91 {
  92         gpio1->pininputen = (0x01 << gpio);
  93         return 0;
  94 }
  95
  96 static int au1xxx_gpio1_direction_output(unsigned gpio, int value)
  97 {
  98         gpio1->trioutclr = (0x01 & gpio);
  99         return 0;
 100 }
 101
 102 int au1xxx_gpio_get_value(unsigned gpio)
 103 {
 104         if (gpio >= AU1XXX_GPIO_BASE)
 105 #if defined(CONFIG_SOC_AU1000)
 106                 return 0;
 107 #else
 108                 return au1xxx_gpio2_read(gpio);
 109 #endif
 110         else
 111                 return au1xxx_gpio1_read(gpio);
 112 }
 113
 114 EXPORT_SYMBOL(au1xxx_gpio_get_value);
 115
 116 void au1xxx_gpio_set_value(unsigned gpio, int value)
 117 {
 118         if (gpio >= AU1XXX_GPIO_BASE)
 119 #if defined(CONFIG_SOC_AU1000)
 120                 ;
 121 #else
 122                 au1xxx_gpio2_write(gpio, value);
 123 #endif
 124         else
 125                 au1xxx_gpio1_write(gpio, value);
 126 }
 127
 128 EXPORT_SYMBOL(au1xxx_gpio_set_value);
 129
 130 int au1xxx_gpio_direction_input(unsigned gpio)
 131 {
 132         if (gpio >= AU1XXX_GPIO_BASE)
 133 #if defined(CONFIG_SOC_AU1000)
 134                 return -ENODEV;
 135 #else
 136                 return au1xxx_gpio2_direction_input(gpio);
 137 #endif
 138
 139         return au1xxx_gpio1_direction_input(gpio);
 140 }
 141
 142 EXPORT_SYMBOL(au1xxx_gpio_direction_input);
 143
 144 int au1xxx_gpio_direction_output(unsigned gpio, int value)
 145 {
 146         if (gpio >= AU1XXX_GPIO_BASE)
 147 #if defined(CONFIG_SOC_AU1000)
 148                 return -ENODEV;
 149 #else
 150                 return au1xxx_gpio2_direction_output(gpio, value);
 151 #endif
 152
 153         return au1xxx_gpio1_direction_output(gpio, value);
 154 }
 155
 156 EXPORT_SYMBOL(au1xxx_gpio_direction_output);