LXR linux/drivers/parisc/wax.c

   1/*
   2 *      WAX Device Driver
   3 *
   4 *      (c) Copyright 2000 The Puffin Group Inc.
   5 *
   6 *      This program is free software; you can redistribute it and/or modify
   7 *      it under the terms of the GNU General Public License as published by
   8 *      the Free Software Foundation; either version 2 of the License, or
   9 *      (at your option) any later version.
  10 *
  11 *      by Helge Deller <deller@gmx.de>
  12 */
  13
  14#include <linux/errno.h>
  15#include <linux/init.h>
  16#include <linux/interrupt.h>
  17#include <linux/ioport.h>
  18#include <linux/slab.h>
  19#include <linux/module.h>
  20#include <linux/types.h>
  21
  22#include <asm/io.h>
  23#include <asm/hardware.h>
  24
  25#include "gsc.h"
  26
  27#define WAX_GSC_IRQ     7       /* Hardcoded Interrupt for GSC */
  28
  29static void wax_choose_irq(struct parisc_device *dev, void *ctrl)
  30{
  31        int irq;
  32
  33        switch (dev->id.sversion) {
  34                case 0x73:      irq =  1; break; /* i8042 General */
  35                case 0x8c:      irq =  6; break; /* Serial */
  36                case 0x90:      irq = 10; break; /* EISA */
  37                default:        return;          /* Unknown */
  38        }
  39
  40        gsc_asic_assign_irq(ctrl, irq, &dev->irq);
  41
  42        switch (dev->id.sversion) {
  43                case 0x73:      irq =  2; break; /* i8042 High-priority */
  44                case 0x90:      irq =  0; break; /* EISA NMI */
  45                default:        return;          /* No secondary IRQ */
  46        }
  47
  48        gsc_asic_assign_irq(ctrl, irq, &dev->aux_irq);
  49}
  50
  51static void __init
  52wax_init_irq(struct gsc_asic *wax)
  53{
  54        unsigned long base = wax->hpa;
  55
  56        /* Wax-off */
  57        gsc_writel(0x00000000, base+OFFSET_IMR);
  58
  59        /* clear pending interrupts */
  60        gsc_readl(base+OFFSET_IRR);
  61
  62        /* We're not really convinced we want to reset the onboard
  63         * devices. Firmware does it for us...
  64         */
  65
  66        /* Resets */
  67//      gsc_writel(0xFFFFFFFF, base+0x1000); /* HIL */
  68//      gsc_writel(0xFFFFFFFF, base+0x2000); /* RS232-B on Wax */
  69}
  70
  71static int __init wax_init_chip(struct parisc_device *dev)
  72{
  73        struct gsc_asic *wax;
  74        struct parisc_device *parent;
  75        struct gsc_irq gsc_irq;
  76        int ret;
  77
  78        wax = kzalloc(sizeof(*wax), GFP_KERNEL);
  79        if (!wax)
  80                return -ENOMEM;
  81
  82        wax->name = "wax";
  83        wax->hpa = dev->hpa.start;
  84
  85        wax->version = 0;   /* gsc_readb(wax->hpa+WAX_VER); */
  86        printk(KERN_INFO "%s at 0x%lx found.\n", wax->name, wax->hpa);
  87
  88        /* Stop wax hissing for a bit */
  89        wax_init_irq(wax);
  90
  91        /* the IRQ wax should use */
  92        dev->irq = gsc_claim_irq(&gsc_irq, WAX_GSC_IRQ);
  93        if (dev->irq < 0) {
  94                printk(KERN_ERR "%s(): cannot get GSC irq\n",
  95                                __func__);
  96                kfree(wax);
  97                return -EBUSY;
  98        }
  99
 100        wax->eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;
 101
 102        ret = request_irq(gsc_irq.irq, gsc_asic_intr, 0, "wax", wax);
 103        if (ret < 0) {
 104                kfree(wax);
 105                return ret;
 106        }
 107
 108        /* enable IRQ's for devices below WAX */
 109        gsc_writel(wax->eim, wax->hpa + OFFSET_IAR);
 110
 111        /* Done init'ing, register this driver */
 112        ret = gsc_common_setup(dev, wax);
 113        if (ret) {
 114                kfree(wax);
 115                return ret;
 116        }
 117
 118        gsc_fixup_irqs(dev, wax, wax_choose_irq);
 119        /* On 715-class machines, Wax EISA is a sibling of Wax, not a child. */
 120        parent = parisc_parent(dev);
 121        if (parent->id.hw_type != HPHW_IOA) {
 122                gsc_fixup_irqs(parent, wax, wax_choose_irq);
 123        }
 124
 125        return ret;
 126}
 127
 128static struct parisc_device_id wax_tbl[] = {
 129        { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008e },
 130        { 0, }
 131};
 132
 133MODULE_DEVICE_TABLE(parisc, wax_tbl);
 134
 135struct parisc_driver wax_driver = {
 136        .name =         "wax",
 137        .id_table =     wax_tbl,
 138        .probe =        wax_init_chip,
 139};
 140