wax.c

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/*
 *  WAX 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/ioport.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/types.h>

#include <asm/io.h>
#include <asm/hardware.h>

#include "gsc.h"

#define WAX_GSC_IRQ 7   /* Hardcoded Interrupt for GSC */

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

    switch (dev->id.sversion) {
        case 0x73:  irq =  1; break; /* i8042 General */
        case 0x8c:  irq =  6; break; /* Serial */
        case 0x90:  irq = 10; break; /* EISA */
        default:    return;      /* Unknown */
    }

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

    switch (dev->id.sversion) {
        case 0x73:  irq =  2; break; /* i8042 High-priority */
        case 0x90:  irq =  0; break; /* EISA NMI */
        default:    return;      /* No secondary IRQ */
    }

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

static void __init
wax_init_irq(struct gsc_asic *wax)
{
    unsigned long base = wax->hpa;

    /* Wax-off */
    gsc_writel(0x00000000, base+OFFSET_IMR);

    /* clear pending interrupts */
    gsc_readl(base+OFFSET_IRR);

    /* We're not really convinced we want to reset the onboard
         * devices. Firmware does it for us...
     */

    /* Resets */
//  gsc_writel(0xFFFFFFFF, base+0x1000); /* HIL */
//  gsc_writel(0xFFFFFFFF, base+0x2000); /* RS232-B on Wax */
}

static int __init wax_init_chip(struct parisc_device *dev)
{
    struct gsc_asic *wax;
    struct parisc_device *parent;
    struct gsc_irq gsc_irq;
    int ret;

    wax = kzalloc(sizeof(*wax), GFP_KERNEL);
    if (!wax)
        return -ENOMEM;

    wax->name = "wax";
    wax->hpa = dev->hpa.start;

    wax->version = 0;   /* gsc_readb(wax->hpa+WAX_VER); */
    printk(KERN_INFO "%s at 0x%lx found.\n", wax->name, wax->hpa);

    /* Stop wax hissing for a bit */
    wax_init_irq(wax);

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

    wax->eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;

    ret = request_irq(gsc_irq.irq, gsc_asic_intr, 0, "wax", wax);
    if (ret < 0) {
        kfree(wax);
        return ret;
    }

    /* enable IRQ's for devices below WAX */
    gsc_writel(wax->eim, wax->hpa + OFFSET_IAR);

    /* Done init'ing, register this driver */
    ret = gsc_common_setup(dev, wax);
    if (ret) {
        kfree(wax);
        return ret;
    }

    gsc_fixup_irqs(dev, wax, wax_choose_irq);
    /* On 715-class machines, Wax EISA is a sibling of Wax, not a child. */
    parent = parisc_parent(dev);
    if (parent->id.hw_type != HPHW_IOA) {
        gsc_fixup_irqs(parent, wax, wax_choose_irq);
    }

    return ret;
}

static struct parisc_device_id wax_tbl[] = {
    { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008e },
    { 0, }
};

MODULE_DEVICE_TABLE(parisc, wax_tbl);

struct parisc_driver wax_driver = {
    .name =     "wax",
    .id_table = wax_tbl,
    .probe =    wax_init_chip,
};