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