linux/drivers/parisc/wax.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *      WAX Device Driver
   4 *
   5 *      (c) Copyright 2000 The Puffin Group Inc.
   6 *
   7 *      by Helge Deller <deller@gmx.de>
   8 */
   9
  10#include <linux/errno.h>
  11#include <linux/init.h>
  12#include <linux/interrupt.h>
  13#include <linux/ioport.h>
  14#include <linux/slab.h>
  15#include <linux/module.h>
  16#include <linux/types.h>
  17
  18#include <asm/io.h>
  19#include <asm/hardware.h>
  20
  21#include "gsc.h"
  22
  23#define WAX_GSC_IRQ     7       /* Hardcoded Interrupt for GSC */
  24
  25static void wax_choose_irq(struct parisc_device *dev, void *ctrl)
  26{
  27        int irq;
  28
  29        switch (dev->id.sversion) {
  30                case 0x73:      irq =  1; break; /* i8042 General */
  31                case 0x8c:      irq =  6; break; /* Serial */
  32                case 0x90:      irq = 10; break; /* EISA */
  33                default:        return;          /* Unknown */
  34        }
  35
  36        gsc_asic_assign_irq(ctrl, irq, &dev->irq);
  37
  38        switch (dev->id.sversion) {
  39                case 0x73:      irq =  2; break; /* i8042 High-priority */
  40                case 0x90:      irq =  0; break; /* EISA NMI */
  41                default:        return;          /* No secondary IRQ */
  42        }
  43
  44        gsc_asic_assign_irq(ctrl, irq, &dev->aux_irq);
  45}
  46
  47static void __init
  48wax_init_irq(struct gsc_asic *wax)
  49{
  50        unsigned long base = wax->hpa;
  51
  52        /* Wax-off */
  53        gsc_writel(0x00000000, base+OFFSET_IMR);
  54
  55        /* clear pending interrupts */
  56        gsc_readl(base+OFFSET_IRR);
  57
  58        /* We're not really convinced we want to reset the onboard
  59         * devices. Firmware does it for us...
  60         */
  61
  62        /* Resets */
  63//      gsc_writel(0xFFFFFFFF, base+0x1000); /* HIL */
  64//      gsc_writel(0xFFFFFFFF, base+0x2000); /* RS232-B on Wax */
  65}
  66
  67static int __init wax_init_chip(struct parisc_device *dev)
  68{
  69        struct gsc_asic *wax;
  70        struct parisc_device *parent;
  71        struct gsc_irq gsc_irq;
  72        int ret;
  73
  74        wax = kzalloc(sizeof(*wax), GFP_KERNEL);
  75        if (!wax)
  76                return -ENOMEM;
  77
  78        wax->name = "wax";
  79        wax->hpa = dev->hpa.start;
  80
  81        wax->version = 0;   /* gsc_readb(wax->hpa+WAX_VER); */
  82        printk(KERN_INFO "%s at 0x%lx found.\n", wax->name, wax->hpa);
  83
  84        /* Stop wax hissing for a bit */
  85        wax_init_irq(wax);
  86
  87        /* the IRQ wax should use */
  88        dev->irq = gsc_claim_irq(&gsc_irq, WAX_GSC_IRQ);
  89        if (dev->irq < 0) {
  90                printk(KERN_ERR "%s(): cannot get GSC irq\n",
  91                                __func__);
  92                kfree(wax);
  93                return -EBUSY;
  94        }
  95
  96        wax->eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;
  97
  98        ret = request_irq(gsc_irq.irq, gsc_asic_intr, 0, "wax", wax);
  99        if (ret < 0) {
 100                kfree(wax);
 101                return ret;
 102        }
 103
 104        /* enable IRQ's for devices below WAX */
 105        gsc_writel(wax->eim, wax->hpa + OFFSET_IAR);
 106
 107        /* Done init'ing, register this driver */
 108        ret = gsc_common_setup(dev, wax);
 109        if (ret) {
 110                kfree(wax);
 111                return ret;
 112        }
 113
 114        gsc_fixup_irqs(dev, wax, wax_choose_irq);
 115        /* On 715-class machines, Wax EISA is a sibling of Wax, not a child. */
 116        parent = parisc_parent(dev);
 117        if (parent->id.hw_type != HPHW_IOA) {
 118                gsc_fixup_irqs(parent, wax, wax_choose_irq);
 119        }
 120
 121        return ret;
 122}
 123
 124static const struct parisc_device_id wax_tbl[] __initconst = {
 125        { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008e },
 126        { 0, }
 127};
 128
 129MODULE_DEVICE_TABLE(parisc, wax_tbl);
 130
 131struct parisc_driver wax_driver __refdata = {
 132        .name =         "wax",
 133        .id_table =     wax_tbl,
 134        .probe =        wax_init_chip,
 135};
 136