2 * The PCI Library -- Direct Configuration access via i386 Ports
4 * Copyright (c) 1997--2006 Martin Mares <mj@ucw.cz>
6 * Can be freely distributed and used under the terms of the GNU GPL.
15 #if defined(PCI_OS_LINUX)
16 #include "i386-io-linux.h"
17 #elif defined(PCI_OS_GNU)
18 #include "i386-io-hurd.h"
19 #elif defined(PCI_OS_SUNOS)
20 #include "i386-io-sunos.h"
21 #elif defined(PCI_OS_WINDOWS)
22 #include "i386-io-windows.h"
23 #elif defined(PCI_OS_CYGWIN)
24 #include "i386-io-cygwin.h"
25 #elif defined(PCI_OS_HAIKU)
26 #include "i386-io-haiku.h"
27 #elif defined(PCI_OS_BEOS)
28 #include "i386-io-beos.h"
29 #elif defined(PCI_OS_DJGPP)
30 #include "i386-io-djgpp.h"
32 #error Do not know how to access I/O ports on this OS.
35 static int conf12_io_enabled = -1; /* -1=haven't tried, 0=failed, 1=succeeded */
38 conf12_setup_io(struct pci_access *a)
40 if (conf12_io_enabled < 0)
41 conf12_io_enabled = intel_setup_io(a);
42 return conf12_io_enabled;
46 conf12_init(struct pci_access *a)
48 if (!conf12_setup_io(a))
49 a->error("No permission to access I/O ports (you probably have to be root).");
53 conf12_cleanup(struct pci_access *a)
55 if (conf12_io_enabled > 0)
58 conf12_io_enabled = -1;
63 * Before we decide to use direct hardware access mechanisms, we try to do some
64 * trivial checks to ensure it at least _seems_ to be working -- we just test
65 * whether bus 00 contains a host bridge (this is similar to checking
66 * techniques used in XFree86, but ours should be more reliable since we
67 * attempt to make use of direct access hints provided by the PCI BIOS).
69 * This should be close to trivial, but it isn't, because there are buggy
70 * chipsets (yes, you guessed it, by Intel and Compaq) that have no class ID.
74 intel_sanity_check(struct pci_access *a, struct pci_methods *m)
78 memset(&d, 0, sizeof(d));
79 a->debug("...sanity check");
82 for (d.dev = 0; d.dev < 32; d.dev++)
85 if (m->read(&d, PCI_CLASS_DEVICE, (byte *) &class, sizeof(class)) &&
86 (class == cpu_to_le16(PCI_CLASS_BRIDGE_HOST) || class == cpu_to_le16(PCI_CLASS_DISPLAY_VGA)) ||
87 m->read(&d, PCI_VENDOR_ID, (byte *) &vendor, sizeof(vendor)) &&
88 (vendor == cpu_to_le16(PCI_VENDOR_ID_INTEL) || vendor == cpu_to_le16(PCI_VENDOR_ID_COMPAQ)))
90 a->debug("...outside the Asylum at 0/%02x/0", d.dev);
94 a->debug("...insane");
99 * Configuration type 1
102 #define CONFIG_CMD(bus, device_fn, where) (0x80000000 | (bus << 16) | (device_fn << 8) | (where & ~3))
105 conf1_detect(struct pci_access *a)
110 if (!conf12_setup_io(a))
112 a->debug("...no I/O permission");
119 outl (0x80000000, 0xCF8);
120 if (inl (0xCF8) == 0x80000000)
126 res = intel_sanity_check(a, &pm_intel_conf1);
131 conf1_read(struct pci_dev *d, int pos, byte *buf, int len)
133 int addr = 0xcfc + (pos&3);
136 if (d->domain || pos >= 256)
140 outl(0x80000000 | ((d->bus & 0xff) << 16) | (PCI_DEVFN(d->dev, d->func) << 8) | (pos&~3), 0xcf8);
148 ((u16 *) buf)[0] = cpu_to_le16(inw(addr));
151 ((u32 *) buf)[0] = cpu_to_le32(inl(addr));
154 res = pci_generic_block_read(d, pos, buf, len);
162 conf1_write(struct pci_dev *d, int pos, byte *buf, int len)
164 int addr = 0xcfc + (pos&3);
167 if (d->domain || pos >= 256)
171 outl(0x80000000 | ((d->bus & 0xff) << 16) | (PCI_DEVFN(d->dev, d->func) << 8) | (pos&~3), 0xcf8);
179 outw(le16_to_cpu(((u16 *) buf)[0]), addr);
182 outl(le32_to_cpu(((u32 *) buf)[0]), addr);
185 res = pci_generic_block_write(d, pos, buf, len);
192 * Configuration type 2. Obsolete and brain-damaged, but existing.
196 conf2_detect(struct pci_access *a)
200 if (!conf12_setup_io(a))
202 a->debug("...no I/O permission");
206 /* This is ugly and tends to produce false positives. Beware. */
212 if (inb(0xCF8) == 0x00 && inb(0xCFA) == 0x00)
213 res = intel_sanity_check(a, &pm_intel_conf2);
219 conf2_read(struct pci_dev *d, int pos, byte *buf, int len)
222 int addr = 0xc000 | (d->dev << 8) | pos;
224 if (d->domain || pos >= 256)
228 /* conf2 supports only 16 devices per bus */
232 outb((d->func << 1) | 0xf0, 0xcf8);
240 ((u16 *) buf)[0] = cpu_to_le16(inw(addr));
243 ((u32 *) buf)[0] = cpu_to_le32(inl(addr));
246 res = pci_generic_block_read(d, pos, buf, len);
254 conf2_write(struct pci_dev *d, int pos, byte *buf, int len)
257 int addr = 0xc000 | (d->dev << 8) | pos;
259 if (d->domain || pos >= 256)
263 /* conf2 supports only 16 devices per bus */
267 outb((d->func << 1) | 0xf0, 0xcf8);
275 outw(le16_to_cpu(* (u16 *) buf), addr);
278 outl(le32_to_cpu(* (u32 *) buf), addr);
281 res = pci_generic_block_write(d, pos, buf, len);
289 struct pci_methods pm_intel_conf1 = {
291 "Raw I/O port access using Intel conf1 interface",
297 pci_generic_fill_info,
302 NULL /* cleanup_dev */
305 struct pci_methods pm_intel_conf2 = {
307 "Raw I/O port access using Intel conf2 interface",
313 pci_generic_fill_info,
318 NULL /* cleanup_dev */