1/*
2** hppb.c:
3**      HP-PB bus driver for the NOVA and K-Class systems.
4**
5**      (c) Copyright 2002 Ryan Bradetich
6**      (c) Copyright 2002 Hewlett-Packard Company
7**
8** This program is free software; you can redistribute it and/or modify
9** it under the terms of the GNU General Public License as published by
10** the Free Software Foundation; either version 2 of the License, or
11** (at your option) any later version.
12**
13*/
14
15#include <linux/types.h>
16#include <linux/init.h>
17#include <linux/mm.h>
18#include <linux/slab.h>
19#include <linux/ioport.h>
20
21#include <asm/io.h>
22#include <asm/hardware.h>
23#include <asm/parisc-device.h>
24
25struct hppb_card {
26	unsigned long hpa;
27	struct resource mmio_region;
28	struct hppb_card *next;
29};
30
31struct hppb_card hppb_card_head = {
32	.hpa = 0,
33	.next = NULL,
34};
35
36#define IO_IO_LOW  offsetof(struct bc_module, io_io_low)
37#define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
38
39/**
40 * hppb_probe - Determine if the hppb driver should claim this device.
41 * @dev: The device which has been found
42 *
43 * Determine if hppb driver should claim this chip (return 0) or not
44 * (return 1). If so, initialize the chip and tell other partners in crime
45 * they have work to do.
46 */
47static int hppb_probe(struct parisc_device *dev)
48{
49	int status;
50	struct hppb_card *card = &hppb_card_head;
51
52	while(card->next) {
53		card = card->next;
54	}
55
56	if(card->hpa) {
57		card->next = kzalloc(sizeof(struct hppb_card), GFP_KERNEL);
58		if(!card->next) {
59			printk(KERN_ERR "HP-PB: Unable to allocate memory.\n");
60			return 1;
61		}
62		card = card->next;
63	}
64        printk(KERN_INFO "Found GeckoBoa at 0x%x\n", dev->hpa.start);
65
66	card->hpa = dev->hpa.start;
67	card->mmio_region.name = "HP-PB Bus";
68	card->mmio_region.flags = IORESOURCE_MEM;
69
70	card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW);
71	card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1;
72
73	status = ccio_request_resource(dev, &card->mmio_region);
74	if(status < 0) {
75		printk(KERN_ERR "%s: failed to claim HP-PB bus space (%08x, %08x)\n",
76			__FILE__, card->mmio_region.start, card->mmio_region.end);
77	}
78
79        return 0;
80}
81
82static struct parisc_device_id hppb_tbl[] = {
83        { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, /* E25 and K */
84        { HPHW_BCPORT, 0x0, 0x501, 0xc }, /* E35 */
85        { HPHW_BCPORT, 0x0, 0x502, 0xc }, /* E45 */
86        { HPHW_BCPORT, 0x0, 0x503, 0xc }, /* E55 */
87        { 0, }
88};
89
90static struct parisc_driver hppb_driver = {
91        .name =         "gecko_boa",
92        .id_table =     hppb_tbl,
93	.probe =        hppb_probe,
94};
95
96/**
97 * hppb_init - HP-PB bus initalization procedure.
98 *
99 * Register this driver.
100 */
101void __init hppb_init(void)
102{
103        register_parisc_driver(&hppb_driver);
104}
105