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auxio.c

/* auxio.c: Probing for the Sparc AUXIO register at boot time.
 *
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 *
 * Refactoring for unified NCR/PCIO support 2002 Eric Brower (ebrower@usa.net)
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/of_device.h>

#include <asm/prom.h>
#include <asm/io.h>
#include <asm/auxio.h>

void __iomem *auxio_register = NULL;
EXPORT_SYMBOL(auxio_register);

enum auxio_type {
      AUXIO_TYPE_NODEV,
      AUXIO_TYPE_SBUS,
      AUXIO_TYPE_EBUS
};

static enum auxio_type auxio_devtype = AUXIO_TYPE_NODEV;
static DEFINE_SPINLOCK(auxio_lock);

static void __auxio_sbus_set(u8 bits_on, u8 bits_off)
{
      if (auxio_register) {
            unsigned char regval;
            unsigned long flags;
            unsigned char newval;

            spin_lock_irqsave(&auxio_lock, flags);

            regval =  sbus_readb(auxio_register);
            newval =  regval | bits_on;
            newval &= ~bits_off;
            newval &= ~AUXIO_AUX1_MASK;
            sbus_writeb(newval, auxio_register);
            
            spin_unlock_irqrestore(&auxio_lock, flags);
      }
}

static void __auxio_ebus_set(u8 bits_on, u8 bits_off)
{
      if (auxio_register) {
            unsigned char regval;
            unsigned long flags;
            unsigned char newval;

            spin_lock_irqsave(&auxio_lock, flags);

            regval =  (u8)readl(auxio_register);
            newval =  regval | bits_on;
            newval &= ~bits_off;
            writel((u32)newval, auxio_register);

            spin_unlock_irqrestore(&auxio_lock, flags);
      }
}

static inline void __auxio_ebus_set_led(int on)
{
      (on) ? __auxio_ebus_set(AUXIO_PCIO_LED, 0) :
            __auxio_ebus_set(0, AUXIO_PCIO_LED) ;
}

static inline void __auxio_sbus_set_led(int on)
{
      (on) ? __auxio_sbus_set(AUXIO_AUX1_LED, 0) :
            __auxio_sbus_set(0, AUXIO_AUX1_LED) ;
}

void auxio_set_led(int on)
{
      switch(auxio_devtype) {
      case AUXIO_TYPE_SBUS:
            __auxio_sbus_set_led(on);
            break;
      case AUXIO_TYPE_EBUS:
            __auxio_ebus_set_led(on);
            break;
      default:
            break;
      }
}

static inline void __auxio_sbus_set_lte(int on)
{
      (on) ? __auxio_sbus_set(AUXIO_AUX1_LTE, 0) : 
            __auxio_sbus_set(0, AUXIO_AUX1_LTE) ;
}

void auxio_set_lte(int on)
{
      switch(auxio_devtype) {
      case AUXIO_TYPE_SBUS:
            __auxio_sbus_set_lte(on);
            break;
      case AUXIO_TYPE_EBUS:
            /* FALL-THROUGH */
      default:
            break;
      }
}

static struct of_device_id auxio_match[] = {
      {
            .name = "auxio",
      },
      {},
};

MODULE_DEVICE_TABLE(of, auxio_match);

static int __devinit auxio_probe(struct of_device *dev, const struct of_device_id *match)
{
      struct device_node *dp = dev->node;
      unsigned long size;

      if (!strcmp(dp->parent->name, "ebus")) {
            auxio_devtype = AUXIO_TYPE_EBUS;
            size = sizeof(u32);
      } else if (!strcmp(dp->parent->name, "sbus")) {
            auxio_devtype = AUXIO_TYPE_SBUS;
            size = 1;
      } else {
            printk("auxio: Unknown parent bus type [%s]\n",
                   dp->parent->name);
            return -ENODEV;
      }
      auxio_register = of_ioremap(&dev->resource[0], 0, size, "auxio");
      if (!auxio_register)
            return -ENODEV;

      printk(KERN_INFO "AUXIO: Found device at %s\n",
             dp->full_name);

      if (auxio_devtype == AUXIO_TYPE_EBUS)
            auxio_set_led(AUXIO_LED_ON);

      return 0;
}

static struct of_platform_driver auxio_driver = {
      .match_table      = auxio_match,
      .probe            = auxio_probe,
      .driver           = {
            .name = "auxio",
      },
};

static int __init auxio_init(void)
{
      return of_register_driver(&auxio_driver, &of_platform_bus_type);
}

/* Must be after subsys_initcall() so that busses are probed.  Must
 * be before device_initcall() because things like the floppy driver
 * need to use the AUXIO register.
 */
fs_initcall(auxio_init);

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