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