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
  29 static 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
  51 static void __init
  52 wax_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
  71 static 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
 128 static const struct parisc_device_id wax_tbl[] __initconst = {
 129         { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008e },
 130         { 0, }
 131 };
 132
 133 MODULE_DEVICE_TABLE(parisc, wax_tbl);
 134
 135 struct parisc_driver wax_driver __refdata = {
 136         .name =         "wax",
 137         .id_table =     wax_tbl,
 138         .probe =        wax_init_chip,
 139 };