Root/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

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