include/asm-nios/status_led.h

   1 /*
   2  * (C) Copyright 2003, Li-Pro.Net <www.li-pro.net>
   3  * Stephan Linz <linz@li-pro.net>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  *
  23  * asm-nios/status_led.h
  24  *
  25  * NIOS PIO based status led support functions
  26  */
  27
  28 #ifndef __ASM_STATUS_LED_H__
  29 #define __ASM_STATUS_LED_H__
  30
  31 #include <nios-io.h>
  32
  33 /* led_id_t is unsigned int mask */
  34 typedef unsigned int led_id_t;
  35
  36 #ifdef  STATUS_LED_WRONLY       /* emulate read access */
  37 static led_id_t __led_portval = 0;
  38 #endif
  39
  40 static inline void __led_init (led_id_t mask, int state)
  41 {
  42         nios_pio_t *piop = (nios_pio_t*)STATUS_LED_BASE;
  43
  44 #ifdef  STATUS_LED_WRONLY       /* emulate read access */
  45
  46 #if (STATUS_LED_ACTIVE == 0)
  47         if (state == STATUS_LED_ON)
  48                 __led_portval &= ~mask;
  49         else
  50                 __led_portval |= mask;
  51 #else
  52         if (state == STATUS_LED_ON)
  53                 __led_portval |= mask;
  54         else
  55                 __led_portval &= ~mask;
  56 #endif
  57
  58         piop->data = __led_portval;
  59
  60 #else   /* !STATUS_LED_WRONLY */
  61
  62 #if (STATUS_LED_ACTIVE == 0)
  63         if (state == STATUS_LED_ON)
  64                 piop->data &= ~mask;
  65         else
  66                 piop->data |= mask;
  67 #else
  68         if (state == STATUS_LED_ON)
  69                 piop->data |= mask;
  70         else
  71                 piop->data &= ~mask;
  72 #endif
  73
  74         piop->direction |= mask;
  75
  76 #endif  /* STATUS_LED_WRONLY */
  77 }
  78
  79 static inline void __led_toggle (led_id_t mask)
  80 {
  81         nios_pio_t *piop = (nios_pio_t*)STATUS_LED_BASE;
  82
  83 #ifdef  STATUS_LED_WRONLY       /* emulate read access */
  84
  85         __led_portval ^= mask;
  86         piop->data = __led_portval;
  87
  88 #else   /* !STATUS_LED_WRONLY */
  89
  90         piop->data ^= mask;
  91
  92 #endif  /* STATUS_LED_WRONLY */
  93 }
  94
  95 static inline void __led_set (led_id_t mask, int state)
  96 {
  97         nios_pio_t *piop = (nios_pio_t*)STATUS_LED_BASE;
  98
  99 #ifdef  STATUS_LED_WRONLY       /* emulate read access */
 100
 101 #if (STATUS_LED_ACTIVE == 0)
 102         if (state == STATUS_LED_ON)
 103                 __led_portval &= ~mask;
 104         else
 105                 __led_portval |= mask;
 106 #else
 107         if (state == STATUS_LED_ON)
 108                 __led_portval |= mask;
 109         else
 110                 __led_portval &= ~mask;
 111 #endif
 112
 113         piop->data = __led_portval;
 114
 115 #else   /* !STATUS_LED_WRONLY */
 116
 117 #if (STATUS_LED_ACTIVE == 0)
 118         if (state == STATUS_LED_ON)
 119                 piop->data &= ~mask;
 120         else
 121                 piop->data |= mask;
 122 #else
 123         if (state == STATUS_LED_ON)
 124                 piop->data |= mask;
 125         else
 126                 piop->data &= ~mask;
 127 #endif
 128
 129 #endif  /* STATUS_LED_WRONLY */
 130 }
 131
 132 #endif  /* __ASM_STATUS_LED_H__ */