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 #include <asm/irq.h>
  25
  26 #include "gsc.h"
  27
  28 #define WAX_GSC_IRQ     7       /* Hardcoded Interrupt for GSC */
  29 #define WAX_GSC_NMI_IRQ 29
  30
  31 static int wax_choose_irq(struct parisc_device *dev)
  32 {
  33         int irq = -1;
  34
  35         switch (dev->id.sversion) {
  36                 case 0x73:      irq = 30; break; /* HIL */
  37                 case 0x8c:      irq = 25; break; /* RS232 */
  38                 case 0x90:      irq = 21; break; /* WAX EISA BA */
  39         }
  40
  41         return irq;
  42 }
  43
  44 static void __init
  45 wax_init_irq(struct busdevice *wax)
  46 {
  47         unsigned long base = wax->hpa;
  48
  49         /* Stop WAX barking for a bit */
  50         gsc_writel(0x00000000, base+OFFSET_IMR);
  51
  52         /* clear pending interrupts */
  53         (volatile u32) gsc_readl(base+OFFSET_IRR);
  54
  55         /* We're not really convinced we want to reset the onboard
  56          * devices. Firmware does it for us...
  57          */
  58
  59         /* Resets */
  60 //      gsc_writel(0xFFFFFFFF, base+0x1000); /* HIL */
  61 //      gsc_writel(0xFFFFFFFF, base+0x2000); /* RS232-B on Wax */
  62
  63         /* Ok we hit it on the head with a hammer, our Dog is now
  64         ** comatose and muzzled.  Devices will now unmask WAX
  65         ** interrupts as they are registered as irq's in the WAX range.
  66         */
  67 }
  68
  69 int __init
  70 wax_init_chip(struct parisc_device *dev)
  71 {
  72         struct busdevice *wax;
  73         struct gsc_irq gsc_irq;
  74         int irq, ret;
  75
  76         wax = kmalloc(sizeof(struct busdevice), GFP_KERNEL);
  77         if (!wax)
  78                 return -ENOMEM;
  79
  80         wax->name = "Wax";
  81         wax->hpa = dev->hpa;
  82
  83         wax->version = 0;   /* gsc_readb(wax->hpa+WAX_VER); */
  84         printk(KERN_INFO "%s at 0x%lx found.\n", wax->name, wax->hpa);
  85
  86         /* Stop wax hissing for a bit */
  87         wax_init_irq(wax);
  88
  89         /* the IRQ wax should use */
  90         irq = gsc_claim_irq(&gsc_irq, WAX_GSC_IRQ);
  91         if (irq < 0) {
  92                 printk(KERN_ERR "%s(): cannot get GSC irq\n",
  93                                 __FUNCTION__);
  94                 kfree(wax);
  95                 return -EBUSY;
  96         }
  97
  98         ret = request_irq(gsc_irq.irq, busdev_barked, 0, "wax", wax);
  99         if (ret < 0) {
 100                 kfree(wax);
 101                 return ret;
 102         }
 103
 104         /* Save this for debugging later */
 105         wax->parent_irq = gsc_irq.irq;
 106         wax->eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;
 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_irqsetup(dev, wax);
 113         if (ret) {
 114                 kfree(wax);
 115                 return ret;
 116         }
 117
 118         fixup_child_irqs(dev, wax->busdev_region->data.irqbase,
 119                         wax_choose_irq);
 120         /* On 715-class machines, Wax EISA is a sibling of Wax, not a child. */
 121         if (dev->parent->id.hw_type != HPHW_IOA) {
 122                 fixup_child_irqs(dev->parent, wax->busdev_region->data.irqbase,
 123                                 wax_choose_irq);
 124         }
 125
 126         return ret;
 127 }
 128
 129 static struct parisc_device_id wax_tbl[] = {
 130         { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008e },
 131         { 0, }
 132 };
 133
 134 MODULE_DEVICE_TABLE(parisc, wax_tbl);
 135
 136 struct parisc_driver wax_driver = {
 137         .name =         "Wax",
 138         .id_table =     wax_tbl,
 139         .probe =        wax_init_chip,
 140 };