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/gsc.h>
26 #include <asm/irq.h>
27
28 #include "busdevice.h"
29
30 #define WAX_GSC_IRQ 7 /* Hardcoded Interrupt for GSC */
31 #define WAX_GSC_NMI_IRQ 29
32
wax_choose_irq(struct parisc_device * dev)33 static int wax_choose_irq(struct parisc_device *dev)
34 {
35 int irq = -1;
36
37 switch (dev->id.sversion) {
38 case 0x73: irq = 30; break; /* HIL */
39 case 0x8c: irq = 25; break; /* RS232 */
40 case 0x90: irq = 21; break; /* WAX EISA BA */
41 }
42
43 return irq;
44 }
45
46 static void __init
wax_init_irq(struct busdevice * wax)47 wax_init_irq(struct busdevice *wax)
48 {
49 unsigned long base = wax->hpa;
50
51 /* Stop WAX barking for a bit */
52 gsc_writel(0x00000000, base+OFFSET_IMR);
53
54 /* clear pending interrupts */
55 (volatile u32) gsc_readl(base+OFFSET_IRR);
56
57 /* We're not really convinced we want to reset the onboard
58 * devices. Firmware does it for us...
59 */
60
61 /* Resets */
62 // gsc_writel(0xFFFFFFFF, base+0x1000); /* HIL */
63 // gsc_writel(0xFFFFFFFF, base+0x2000); /* RS232-B on Wax */
64
65 /* Ok we hit it on the head with a hammer, our Dog is now
66 ** comatose and muzzled. Devices will now unmask WAX
67 ** interrupts as they are registered as irq's in the WAX range.
68 */
69 }
70
71 int __init
wax_init_chip(struct parisc_device * dev)72 wax_init_chip(struct parisc_device *dev)
73 {
74 struct busdevice *wax;
75 struct gsc_irq gsc_irq;
76 int irq, ret;
77
78 wax = kmalloc(sizeof(struct busdevice), GFP_KERNEL);
79 if (!wax)
80 return -ENOMEM;
81
82 wax->name = "Wax";
83 wax->hpa = dev->hpa;
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 irq = gsc_claim_irq(&gsc_irq, WAX_GSC_IRQ);
93 if (irq < 0) {
94 printk(KERN_ERR "%s(): cannot get GSC irq\n",
95 __FUNCTION__);
96 kfree(wax);
97 return -EBUSY;
98 }
99
100 ret = request_irq(gsc_irq.irq, busdev_barked, 0, "wax", wax);
101 if (ret < 0) {
102 kfree(wax);
103 return ret;
104 }
105
106 /* Save this for debugging later */
107 wax->parent_irq = gsc_irq.irq;
108 wax->eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;
109
110 /* enable IRQ's for devices below WAX */
111 gsc_writel(wax->eim, wax->hpa + OFFSET_IAR);
112
113 /* Done init'ing, register this driver */
114 ret = gsc_common_irqsetup(dev, wax);
115 if (ret) {
116 kfree(wax);
117 return ret;
118 }
119
120 fixup_child_irqs(dev, wax->busdev_region->data.irqbase,
121 wax_choose_irq);
122 /* On 715-class machines, Wax EISA is a sibling of Wax, not a child. */
123 if (dev->parent->id.hw_type != HPHW_IOA) {
124 fixup_child_irqs(dev->parent, wax->busdev_region->data.irqbase,
125 wax_choose_irq);
126 }
127
128 return ret;
129 }
130
131 static struct parisc_device_id wax_tbl[] = {
132 { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008e },
133 { 0, }
134 };
135
136 MODULE_DEVICE_TABLE(parisc, wax_tbl);
137
138 struct parisc_driver wax_driver = {
139 name: "Wax",
140 id_table: wax_tbl,
141 probe: wax_init_chip,
142 };
143