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/slab.h>
  21 #include <linux/types.h>
  22
  23 #include <asm/io.h>
  24 #include <asm/hardware.h>
  25 #include <asm/irq.h>
  26
  27 #include "gsc.h"
  28
  29 #define WAX_GSC_IRQ     7       /* Hardcoded Interrupt for GSC */
  30 #define WAX_GSC_NMI_IRQ 29
  31
  32 static int wax_choose_irq(struct parisc_device *dev)
  33 {
  34         int irq = -1;
  35
  36         switch (dev->id.sversion) {
  37                 case 0x73:      irq = 30; break; /* HIL */
  38                 case 0x8c:      irq = 25; break; /* RS232 */
  39                 case 0x90:      irq = 21; break; /* WAX EISA BA */
  40         }
  41
  42         return irq;
  43 }
  44
  45 static void __init
  46 wax_init_irq(struct busdevice *wax)
  47 {
  48         unsigned long base = wax->hpa;
  49
  50         /* Stop WAX barking for a bit */
  51         gsc_writel(0x00000000, base+OFFSET_IMR);
  52
  53         /* clear pending interrupts */
  54         (volatile u32) gsc_readl(base+OFFSET_IRR);
  55
  56         /* We're not really convinced we want to reset the onboard
  57          * devices. Firmware does it for us...
  58          */
  59
  60         /* Resets */
  61 //      gsc_writel(0xFFFFFFFF, base+0x1000); /* HIL */
  62 //      gsc_writel(0xFFFFFFFF, base+0x2000); /* RS232-B on Wax */
  63
  64         /* Ok we hit it on the head with a hammer, our Dog is now
  65         ** comatose and muzzled.  Devices will now unmask WAX
  66         ** interrupts as they are registered as irq's in the WAX range.
  67         */
  68 }
  69
  70 int __init
  71 wax_init_chip(struct parisc_device *dev)
  72 {
  73         struct busdevice *wax;
  74         struct gsc_irq gsc_irq;
  75         int irq, ret;
  76
  77         wax = kmalloc(sizeof(struct busdevice), GFP_KERNEL);
  78         if (!wax)
  79                 return -ENOMEM;
  80
  81         wax->name = "Wax";
  82         wax->hpa = dev->hpa;
  83
  84         wax->version = 0;   /* gsc_readb(wax->hpa+WAX_VER); */
  85         printk(KERN_INFO "%s at 0x%lx found.\n", wax->name, wax->hpa);
  86
  87         /* Stop wax hissing for a bit */
  88         wax_init_irq(wax);
  89
  90         /* the IRQ wax should use */
  91         irq = gsc_claim_irq(&gsc_irq, WAX_GSC_IRQ);
  92         if (irq < 0) {
  93                 printk(KERN_ERR "%s(): cannot get GSC irq\n",
  94                                 __FUNCTION__);
  95                 kfree(wax);
  96                 return -EBUSY;
  97         }
  98
  99         ret = request_irq(gsc_irq.irq, busdev_barked, 0, "wax", wax);
 100         if (ret < 0) {
 101                 kfree(wax);
 102                 return ret;
 103         }
 104
 105         /* Save this for debugging later */
 106         wax->parent_irq = gsc_irq.irq;
 107         wax->eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;
 108
 109         /* enable IRQ's for devices below WAX */
 110         gsc_writel(wax->eim, wax->hpa + OFFSET_IAR);
 111
 112         /* Done init'ing, register this driver */
 113         ret = gsc_common_irqsetup(dev, wax);
 114         if (ret) {
 115                 kfree(wax);
 116                 return ret;
 117         }
 118
 119         fixup_child_irqs(dev, wax->busdev_region->data.irqbase,
 120                         wax_choose_irq);
 121         /* On 715-class machines, Wax EISA is a sibling of Wax, not a child. */
 122         if (dev->parent->id.hw_type != HPHW_IOA) {
 123                 fixup_child_irqs(dev->parent, wax->busdev_region->data.irqbase,
 124                                 wax_choose_irq);
 125         }
 126
 127         return ret;
 128 }
 129
 130 static struct parisc_device_id wax_tbl[] = {
 131         { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008e },
 132         { 0, }
 133 };
 134
 135 MODULE_DEVICE_TABLE(parisc, wax_tbl);
 136
 137 struct parisc_driver wax_driver = {
 138         .name =         "Wax",
 139         .id_table =     wax_tbl,
 140         .probe =        wax_init_chip,
 141 };