ide: be able to build pmac driver without IDE built-in
[linux-2.6] / drivers / ide / ide-legacy.c
1 #include <linux/kernel.h>
2 #include <linux/ide.h>
3
4 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
5                                 u8 port_no, const struct ide_port_info *d,
6                                 unsigned long config)
7 {
8         unsigned long base, ctl;
9         int irq;
10
11         if (port_no == 0) {
12                 base = 0x1f0;
13                 ctl  = 0x3f6;
14                 irq  = 14;
15         } else {
16                 base = 0x170;
17                 ctl  = 0x376;
18                 irq  = 15;
19         }
20
21         if (!request_region(base, 8, d->name)) {
22                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
23                                 d->name, base, base + 7);
24                 return;
25         }
26
27         if (!request_region(ctl, 1, d->name)) {
28                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
29                                 d->name, ctl);
30                 release_region(base, 8);
31                 return;
32         }
33
34         ide_std_init_ports(hw, base, ctl);
35         hw->irq = irq;
36         hw->chipset = d->chipset;
37         hw->config = config;
38
39         hws[port_no] = hw;
40 }
41
42 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
43 {
44         hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
45
46         memset(&hw, 0, sizeof(hw));
47
48         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
49                 ide_legacy_init_one(hws, &hw[0], 0, d, config);
50         ide_legacy_init_one(hws, &hw[1], 1, d, config);
51
52         if (hws[0] == NULL && hws[1] == NULL &&
53             (d->host_flags & IDE_HFLAG_SINGLE))
54                 return -ENOENT;
55
56         return ide_host_add(d, hws, NULL);
57 }
58 EXPORT_SYMBOL_GPL(ide_legacy_device_add);