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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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** This Driver currently only supports the console (port 0) on the MUX.
14** Additional work will be needed on this driver to enable the full
15** functionality of the MUX.
16**
17*/
18
19#include <linux/types.h>
20#include <linux/init.h>
21#include <linux/mm.h>
22#include <linux/slab.h>
23#include <linux/ioport.h>
24
25#include <asm/io.h>
26#include <asm/hardware.h>
27#include <asm/parisc-device.h>
28
29#include <linux/pci.h>
30
31struct hppb_card {
32 unsigned long hpa;
33 struct resource mmio_region;
34 struct hppb_card *next;
35};
36
37struct hppb_card hppb_card_head = {
38 .hpa = 0,
39 .next = NULL,
40};
41
42#define IO_IO_LOW offsetof(struct bc_module, io_io_low)
43#define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
44
45/**
46 * hppb_probe - Determine if the hppb driver should claim this device.
47 * @dev: The device which has been found
48 *
49 * Determine if hppb driver should claim this chip (return 0) or not
50 * (return 1). If so, initialize the chip and tell other partners in crime
51 * they have work to do.
52 */
53static int hppb_probe(struct parisc_device *dev)
54{
55 int status;
56 struct hppb_card *card = &hppb_card_head;
57
58 while(card->next) {
59 card = card->next;
60 }
61
62 if(card->hpa) {
63 card->next = kmalloc(sizeof(struct hppb_card), GFP_KERNEL);
64 if(!card->next) {
65 printk(KERN_ERR "HP-PB: Unable to allocate memory.\n");
66 return 1;
67 }
68 memset(card->next, '\0', sizeof(struct hppb_card));
69 card = card->next;
70 }
71 printk(KERN_INFO "Found GeckoBoa at 0x%lx\n", dev->hpa);
72
73 card->hpa = dev->hpa;
74 card->mmio_region.name = "HP-PB Bus";
75 card->mmio_region.flags = IORESOURCE_MEM;
76
77 card->mmio_region.start = __raw_readl(dev->hpa + IO_IO_LOW);
78 card->mmio_region.end = __raw_readl(dev->hpa + IO_IO_HIGH) - 1;
79
80 status = ccio_request_resource(dev, &card->mmio_region);
81 if(status < 0) {
82 printk(KERN_ERR "%s: failed to claim HP-PB bus space (%08lx, %08lx)\n",
83 __FILE__, card->mmio_region.start, card->mmio_region.end);
84 }
85
86 return 0;
87}
88
89
90static struct parisc_device_id hppb_tbl[] = {
91 { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc },
92 { 0, }
93};
94
95static struct parisc_driver hppb_driver = {
96 .name = "Gecko Boa",
97 .id_table = hppb_tbl,
98 .probe = hppb_probe,
99};
100
101/**
102 * hppb_init - HP-PB bus initalization procedure.
103 *
104 * Register this driver.
105 */
106void __init hppb_init(void)
107{
108 register_parisc_driver(&hppb_driver);
109}