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/dma-mapping.h>
20 #include <linux/ioport.h>
21
22 #include <asm/io.h>
23 #include <asm/hardware.h>
24 #include <asm/parisc-device.h>
25
26 struct hppb_card {
27 unsigned long hpa;
28 struct resource mmio_region;
29 struct hppb_card *next;
30 };
31
32 static struct hppb_card hppb_card_head = {
33 .hpa = 0,
34 .next = NULL,
35 };
36
37 #define IO_IO_LOW offsetof(struct bc_module, io_io_low)
38 #define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
39
40 /**
41 * hppb_probe - Determine if the hppb driver should claim this device.
42 * @dev: The device which has been found
43 *
44 * Determine if hppb driver should claim this chip (return 0) or not
45 * (return 1). If so, initialize the chip and tell other partners in crime
46 * they have work to do.
47 */
hppb_probe(struct parisc_device * dev)48 static int hppb_probe(struct parisc_device *dev)
49 {
50 int status;
51 struct hppb_card *card = &hppb_card_head;
52
53 while(card->next) {
54 card = card->next;
55 }
56
57 if(card->hpa) {
58 card->next = kzalloc(sizeof(struct hppb_card), GFP_KERNEL);
59 if(!card->next) {
60 printk(KERN_ERR "HP-PB: Unable to allocate memory.\n");
61 return 1;
62 }
63 card = card->next;
64 }
65 printk(KERN_INFO "Found GeckoBoa at 0x%llx\n",
66 (unsigned long long) dev->hpa.start);
67
68 card->hpa = dev->hpa.start;
69 card->mmio_region.name = "HP-PB Bus";
70 card->mmio_region.flags = IORESOURCE_MEM;
71
72 card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW);
73 card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1;
74
75 status = ccio_request_resource(dev, &card->mmio_region);
76 if(status < 0) {
77 printk(KERN_ERR "%s: failed to claim HP-PB "
78 "bus space (0x%08llx, 0x%08llx)\n",
79 __FILE__, (unsigned long long) card->mmio_region.start,
80 (unsigned long long) card->mmio_region.end);
81 }
82
83 return 0;
84 }
85
86 static struct parisc_device_id hppb_tbl[] = {
87 { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, /* E25 and K */
88 { HPHW_BCPORT, 0x0, 0x501, 0xc }, /* E35 */
89 { HPHW_BCPORT, 0x0, 0x502, 0xc }, /* E45 */
90 { HPHW_BCPORT, 0x0, 0x503, 0xc }, /* E55 */
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 initialization procedure.
102 *
103 * Register this driver.
104 */
hppb_init(void)105 void __init hppb_init(void)
106 {
107 register_parisc_driver(&hppb_driver);
108 }
109