release/src-rt-6.x/linux/linux-2.6/arch/mips/au1000/common/gpio.c

   1 /*
   2  *  This program is free software; you can redistribute  it and/or modify it
   3  *  under  the terms of  the GNU General  Public License as published by the
   4  *  Free Software Foundation;  either version 2 of the  License, or (at your
   5  *  option) any later version.
   6  *
   7  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
   8  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
   9  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  10  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  11  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  12  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  13  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  14  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  15  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  16  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  17  *
  18  *  You should have received a copy of the  GNU General Public License along
  19  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  20  *  675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22 #include <linux/module.h>
  23 #include <au1000.h>
  24 #include <au1xxx_gpio.h>
  25
  26 #define gpio1 sys
  27 #if !defined(CONFIG_SOC_AU1000)
  28 static AU1X00_GPIO2 * const gpio2 = (AU1X00_GPIO2 *)GPIO2_BASE;
  29
  30 #define GPIO2_OUTPUT_ENABLE_MASK 0x00010000
  31
  32 int au1xxx_gpio2_read(int signal)
  33 {
  34         signal -= 200;
  35 /*      gpio2->dir &= ~(0x01 << signal);                                                //Set GPIO to input */
  36         return ((gpio2->pinstate >> signal) & 0x01);
  37 }
  38
  39 void au1xxx_gpio2_write(int signal, int value)
  40 {
  41         signal -= 200;
  42
  43         gpio2->output = (GPIO2_OUTPUT_ENABLE_MASK << signal) |
  44                 (value << signal);
  45 }
  46
  47 void au1xxx_gpio2_tristate(int signal)
  48 {
  49         signal -= 200;
  50         gpio2->dir &= ~(0x01 << signal);        /* Set GPIO to input */
  51 }
  52 #endif
  53
  54 int au1xxx_gpio1_read(int signal)
  55 {
  56 /*      gpio1->trioutclr |= (0x01 << signal); */
  57         return ((gpio1->pinstaterd >> signal) & 0x01);
  58 }
  59
  60 void au1xxx_gpio1_write(int signal, int value)
  61 {
  62         if(value)
  63                 gpio1->outputset = (0x01 << signal);
  64         else
  65                 gpio1->outputclr = (0x01 << signal);    /* Output a Zero */
  66 }
  67
  68 void au1xxx_gpio1_tristate(int signal)
  69 {
  70         gpio1->trioutclr = (0x01 << signal);            /* Tristate signal */
  71 }
  72
  73
  74 int au1xxx_gpio_read(int signal)
  75 {
  76         if(signal >= 200)
  77 #if defined(CONFIG_SOC_AU1000)
  78                 return 0;
  79 #else
  80                 return au1xxx_gpio2_read(signal);
  81 #endif
  82         else
  83                 return au1xxx_gpio1_read(signal);
  84 }
  85
  86 void au1xxx_gpio_write(int signal, int value)
  87 {
  88         if(signal >= 200)
  89 #if defined(CONFIG_SOC_AU1000)
  90                 ;
  91 #else
  92                 au1xxx_gpio2_write(signal, value);
  93 #endif
  94         else
  95                 au1xxx_gpio1_write(signal, value);
  96 }
  97
  98 void au1xxx_gpio_tristate(int signal)
  99 {
 100         if(signal >= 200)
 101 #if defined(CONFIG_SOC_AU1000)
 102                 ;
 103 #else
 104                 au1xxx_gpio2_tristate(signal);
 105 #endif
 106         else
 107                 au1xxx_gpio1_tristate(signal);
 108 }
 109
 110 void au1xxx_gpio1_set_inputs(void)
 111 {
 112         gpio1->pininputen = 0;
 113 }
 114
 115 EXPORT_SYMBOL(au1xxx_gpio1_set_inputs);
 116 EXPORT_SYMBOL(au1xxx_gpio_tristate);
 117 EXPORT_SYMBOL(au1xxx_gpio_write);
 118 EXPORT_SYMBOL(au1xxx_gpio_read);