linux-imx

/*

 * eisa.c - provide support for EISA adapters in PA-RISC machines

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 *

 * Copyright (c) 2001 Matthew Wilcox for Hewlett Packard

 * Copyright (c) 2001 Daniel Engstrom <5116@telia.com>

 *

 * There are two distinct EISA adapters.  Mongoose is found in machines

 * before the 712; then the Wax ASIC is used.  To complicate matters, the

 * Wax ASIC also includes a PS/2 and RS-232 controller, but those are

 * dealt with elsewhere; this file is concerned only with the EISA portions

 * of Wax.

 *

 *

 * HINT:

 * -----

 * To allow an ISA card to work properly in the EISA slot you need to

 * set an edge trigger level. This may be done on the palo command line

 * by adding the kernel parameter "eisa_irq_edge=n,n2,[...]]", with

 * n and n2 as the irq levels you want to use.

 *

 * Example: "eisa_irq_edge=10,11" allows ISA cards to operate at

 * irq levels 10 and 11.

 */

​

#include <linux/init.h>

#include <linux/ioport.h>

#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/spinlock.h>

#include <linux/eisa.h>

​

#include <asm/byteorder.h>

#include <asm/io.h>

#include <asm/hardware.h>

#include <asm/processor.h>

#include <asm/parisc-device.h>

#include <asm/delay.h>

#include <asm/eisa_bus.h>

#include <asm/eisa_eeprom.h>

​

#include "iommu.h"

​

#if 0

#define EISA_DBG(msg, arg...) printk(KERN_DEBUG "eisa: " msg, ## arg)

#else

#define EISA_DBG(msg, arg...)

#endif

​

#define SNAKES_EEPROM_BASE_ADDR 0xF0810400

#define MIRAGE_EEPROM_BASE_ADDR 0xF00C0400

​

static DEFINE_SPINLOCK(eisa_irq_lock);

​

void __iomem *eisa_eeprom_addr __read_mostly;

​

/* We can only have one EISA adapter in the system because neither

 * implementation can be flexed.

 */

static struct eisa_ba {

    struct pci_hba_data hba;

    unsigned long eeprom_addr;

    struct eisa_root_device root;

} eisa_dev;

​

/* Port ops */

​

static inline unsigned long eisa_permute(unsigned short port)

{

    if (port & 0x300) {

        return 0xfc000000 | ((port & 0xfc00) >> 6)

            | ((port & 0x3f8) << 9) | (port & 7);

    } else {

        return 0xfc000000 | port;

    }

}

​

unsigned char eisa_in8(unsigned short port)

{

    if (EISA_bus)

        return gsc_readb(eisa_permute(port));

    return 0xff;

}

​

unsigned short eisa_in16(unsigned short port)

{