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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 | ** 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 | ||
31 | struct hppb_card { | |
32 | unsigned long hpa; | |
33 | struct resource mmio_region; | |
34 | struct hppb_card *next; | |
35 | }; | |
36 | ||
37 | struct 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 | */ | |
53 | static 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 = kzalloc(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 | card = card->next; | |
69 | } | |
70 | printk(KERN_INFO "Found GeckoBoa at 0x%lx\n", dev->hpa.start); | |
71 | ||
72 | card->hpa = dev->hpa.start; | |
73 | card->mmio_region.name = "HP-PB Bus"; | |
74 | card->mmio_region.flags = IORESOURCE_MEM; | |
75 | ||
76 | card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW); | |
77 | card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1; | |
78 | ||
79 | status = ccio_request_resource(dev, &card->mmio_region); | |
80 | if(status < 0) { | |
81 | printk(KERN_ERR "%s: failed to claim HP-PB bus space (%08lx, %08lx)\n", | |
82 | __FILE__, card->mmio_region.start, card->mmio_region.end); | |
83 | } | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | ||
89 | static struct parisc_device_id hppb_tbl[] = { | |
90 | { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, | |
91 | { 0, } | |
92 | }; | |
93 | ||
94 | static struct parisc_driver hppb_driver = { | |
95 | .name = "gecko_boa", | |
96 | .id_table = hppb_tbl, | |
97 | .probe = hppb_probe, | |
98 | }; | |
99 | ||
100 | /** | |
101 | * hppb_init - HP-PB bus initalization procedure. | |
102 | * | |
103 | * Register this driver. | |
104 | */ | |
105 | void __init hppb_init(void) | |
106 | { | |
107 | register_parisc_driver(&hppb_driver); | |
108 | } |