asp.c

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/*
 *  ASP Device Driver
 *
 *  (c) Copyright 2000 The Puffin Group Inc.
 *
 *  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.
 *
 *  by Helge Deller <[email protected]>
 */

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/types.h>
#include <asm/io.h>
#include <asm/led.h>

#include "gsc.h"

#define ASP_GSC_IRQ 3       /* hardcoded interrupt for GSC */

#define ASP_VER_OFFSET  0x20        /* offset of ASP version */

#define ASP_LED_ADDR    0xf0800020

#define VIPER_INT_WORD  0xFFFBF088      /* addr of viper interrupt word */

static struct gsc_asic asp;

static void asp_choose_irq(struct parisc_device *dev, void *ctrl)
{
    int irq;

    switch (dev->id.sversion) {
    case 0x71:  irq =  9; break; /* SCSI */
    case 0x72:  irq =  8; break; /* LAN */
    case 0x73:  irq =  1; break; /* HIL */
    case 0x74:  irq =  7; break; /* Centronics */
    case 0x75:  irq = (dev->hw_path == 4) ? 5 : 6; break; /* RS232 */
    case 0x76:  irq = 10; break; /* EISA BA */
    case 0x77:  irq = 11; break; /* Graphics1 */
    case 0x7a:  irq = 13; break; /* Audio (Bushmaster) */
    case 0x7b:  irq = 13; break; /* Audio (Scorpio) */
    case 0x7c:  irq =  3; break; /* FW SCSI */
    case 0x7d:  irq =  4; break; /* FDDI */
    case 0x7f:  irq = 13; break; /* Audio (Outfield) */
    default:    return;      /* Unknown */
    }

    gsc_asic_assign_irq(ctrl, irq, &dev->irq);

    switch (dev->id.sversion) {
    case 0x73:  irq =  2; break; /* i8042 High-priority */
    case 0x76:  irq =  0; break; /* EISA BA */
    default:    return;      /* Other */
    }

    gsc_asic_assign_irq(ctrl, irq, &dev->aux_irq);
}

/* There are two register ranges we're interested in.  Interrupt /
 * Status / LED are at 0xf080xxxx and Asp special registers are at
 * 0xf082fxxx.  PDC only tells us that Asp is at 0xf082f000, so for
 * the purposes of interrupt handling, we have to tell other bits of
 * the kernel to look at the other registers.
 */
#define ASP_INTERRUPT_ADDR 0xf0800000

static int __init asp_init_chip(struct parisc_device *dev)
{
    struct gsc_irq gsc_irq;
    int ret;

    asp.version = gsc_readb(dev->hpa.start + ASP_VER_OFFSET) & 0xf;
    asp.name = (asp.version == 1) ? "Asp" : "Cutoff";
    asp.hpa = ASP_INTERRUPT_ADDR;

    printk(KERN_INFO "%s version %d at 0x%lx found.\n", 
        asp.name, asp.version, (unsigned long)dev->hpa.start);

    /* the IRQ ASP should use */
    ret = -EBUSY;
    dev->irq = gsc_claim_irq(&gsc_irq, ASP_GSC_IRQ);
    if (dev->irq < 0) {
        printk(KERN_ERR "%s(): cannot get GSC irq\n", __func__);
        goto out;
    }

    asp.eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;

    ret = request_irq(gsc_irq.irq, gsc_asic_intr, 0, "asp", &asp);
    if (ret < 0)
        goto out;

    /* Program VIPER to interrupt on the ASP irq */
    gsc_writel((1 << (31 - ASP_GSC_IRQ)),VIPER_INT_WORD);

    /* Done init'ing, register this driver */
    ret = gsc_common_setup(dev, &asp);
    if (ret)
        goto out;

    gsc_fixup_irqs(dev, &asp, asp_choose_irq);
    /* Mongoose is a sibling of Asp, not a child... */
    gsc_fixup_irqs(parisc_parent(dev), &asp, asp_choose_irq);

    /* initialize the chassis LEDs */ 
#ifdef CONFIG_CHASSIS_LCD_LED   
    register_led_driver(DISPLAY_MODEL_OLD_ASP, LED_CMD_REG_NONE, 
            ASP_LED_ADDR);
#endif

 out:
    return ret;
}

static struct parisc_device_id asp_tbl[] = {
    { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00070 },
    { 0, }
};

struct parisc_driver asp_driver = {
    .name =     "asp",
    .id_table = asp_tbl,
    .probe =    asp_init_chip,
};