linux/arch/cris/arch-v32/mach-a3/io.c
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   1/*
   2 * Helper functions for I/O pins.
   3 *
   4 * Copyright (c) 2005-2007 Axis Communications AB.
   5 */
   6
   7#include <linux/types.h>
   8#include <linux/errno.h>
   9#include <linux/init.h>
  10#include <linux/string.h>
  11#include <linux/ctype.h>
  12#include <linux/kernel.h>
  13#include <linux/module.h>
  14#include <asm/io.h>
  15#include <mach/pinmux.h>
  16#include <hwregs/gio_defs.h>
  17
  18struct crisv32_ioport crisv32_ioports[] = {
  19        {
  20                (unsigned long *)REG_ADDR(gio, regi_gio, rw_pa_oe),
  21                (unsigned long *)REG_ADDR(gio, regi_gio, rw_pa_dout),
  22                (unsigned long *)REG_ADDR(gio, regi_gio, r_pa_din),
  23                32
  24        },
  25        {
  26                (unsigned long *)REG_ADDR(gio, regi_gio, rw_pb_oe),
  27                (unsigned long *)REG_ADDR(gio, regi_gio, rw_pb_dout),
  28                (unsigned long *)REG_ADDR(gio, regi_gio, r_pb_din),
  29                32
  30        },
  31        {
  32                (unsigned long *)REG_ADDR(gio, regi_gio, rw_pc_oe),
  33                (unsigned long *)REG_ADDR(gio, regi_gio, rw_pc_dout),
  34                (unsigned long *)REG_ADDR(gio, regi_gio, r_pc_din),
  35                16
  36        },
  37};
  38
  39#define NBR_OF_PORTS sizeof(crisv32_ioports)/sizeof(struct crisv32_ioport)
  40
  41struct crisv32_iopin crisv32_led_net0_green;
  42struct crisv32_iopin crisv32_led_net0_red;
  43struct crisv32_iopin crisv32_led2_green;
  44struct crisv32_iopin crisv32_led2_red;
  45struct crisv32_iopin crisv32_led3_green;
  46struct crisv32_iopin crisv32_led3_red;
  47
  48/* Dummy port used when green LED and red LED is on the same bit */
  49static unsigned long io_dummy;
  50static struct crisv32_ioport dummy_port = {
  51        &io_dummy,
  52        &io_dummy,
  53        &io_dummy,
  54        32
  55};
  56static struct crisv32_iopin dummy_led = {
  57        &dummy_port,
  58        0
  59};
  60
  61static int __init crisv32_io_init(void)
  62{
  63        int ret = 0;
  64
  65        u32 i;
  66
  67        /* Locks *should* be dynamically initialized. */
  68        for (i = 0; i < ARRAY_SIZE(crisv32_ioports); i++)
  69                spin_lock_init(&crisv32_ioports[i].lock);
  70        spin_lock_init(&dummy_port.lock);
  71
  72        /* Initialize LEDs */
  73#if (defined(CONFIG_ETRAX_NBR_LED_GRP_ONE) || defined(CONFIG_ETRAX_NBR_LED_GRP_TWO))
  74        ret += crisv32_io_get_name(&crisv32_led_net0_green,
  75                CONFIG_ETRAX_LED_G_NET0);
  76        crisv32_io_set_dir(&crisv32_led_net0_green, crisv32_io_dir_out);
  77        if (strcmp(CONFIG_ETRAX_LED_G_NET0, CONFIG_ETRAX_LED_R_NET0)) {
  78                ret += crisv32_io_get_name(&crisv32_led_net0_red,
  79                        CONFIG_ETRAX_LED_R_NET0);
  80                crisv32_io_set_dir(&crisv32_led_net0_red, crisv32_io_dir_out);
  81        } else
  82                crisv32_led_net0_red = dummy_led;
  83#endif
  84
  85        ret += crisv32_io_get_name(&crisv32_led2_green, CONFIG_ETRAX_V32_LED2G);
  86        ret += crisv32_io_get_name(&crisv32_led2_red, CONFIG_ETRAX_V32_LED2R);
  87        ret += crisv32_io_get_name(&crisv32_led3_green, CONFIG_ETRAX_V32_LED3G);
  88        ret += crisv32_io_get_name(&crisv32_led3_red, CONFIG_ETRAX_V32_LED3R);
  89
  90        crisv32_io_set_dir(&crisv32_led2_green, crisv32_io_dir_out);
  91        crisv32_io_set_dir(&crisv32_led2_red, crisv32_io_dir_out);
  92        crisv32_io_set_dir(&crisv32_led3_green, crisv32_io_dir_out);
  93        crisv32_io_set_dir(&crisv32_led3_red, crisv32_io_dir_out);
  94
  95        return ret;
  96}
  97
  98__initcall(crisv32_io_init);
  99
 100int crisv32_io_get(struct crisv32_iopin *iopin,
 101        unsigned int port, unsigned int pin)
 102{
 103        if (port > NBR_OF_PORTS)
 104                return -EINVAL;
 105        if (port > crisv32_ioports[port].pin_count)
 106                return -EINVAL;
 107
 108        iopin->bit = 1 << pin;
 109        iopin->port = &crisv32_ioports[port];
 110
 111        if (crisv32_pinmux_alloc(port, pin, pin, pinmux_gpio))
 112                return -EIO;
 113
 114        return 0;
 115}
 116
 117int crisv32_io_get_name(struct crisv32_iopin *iopin, const char *name)
 118{
 119        int port;
 120        int pin;
 121
 122        if (toupper(*name) == 'P')
 123                name++;
 124
 125        if (toupper(*name) < 'A' || toupper(*name) > 'E')
 126                return -EINVAL;
 127
 128        port = toupper(*name) - 'A';
 129        name++;
 130        pin = simple_strtoul(name, NULL, 10);
 131
 132        if (pin < 0 || pin > crisv32_ioports[port].pin_count)
 133                return -EINVAL;
 134
 135        iopin->bit = 1 << pin;
 136        iopin->port = &crisv32_ioports[port];
 137
 138        if (crisv32_pinmux_alloc(port, pin, pin, pinmux_gpio))
 139                return -EIO;
 140
 141        return 0;
 142}
 143
 144#ifdef CONFIG_PCI
 145/* PCI I/O access stuff */
 146struct cris_io_operations *cris_iops = NULL;
 147EXPORT_SYMBOL(cris_iops);
 148#endif
 149
 150