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* The PCI Library -- Direct Configuration access via i386 Ports
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* Copyright (c) 1997--2004 Martin Mares <mj@ucw.cz>
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* May 8, 2006 - Modified and ported to HelenOS by Jakub Jermar.
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* Can be freely distributed and used under the terms of the GNU GPL.
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static inline void outb(u8 b, u16 port)
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asm volatile ("outb %0, %1\n" :: "a" (b), "d" (port));
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static inline void outw(u16 w, u16 port)
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asm volatile ("outw %0, %1\n" :: "a" (w), "d" (port));
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static inline void outl(u32 l, u16 port)
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asm volatile ("outl %0, %1\n" :: "a" (l), "d" (port));
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static inline u8 inb(u16 port)
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asm volatile ("inb %1, %0 \n" : "=a" (val) : "d"(port));
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static inline u16 inw(u16 port)
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asm volatile ("inw %1, %0 \n" : "=a" (val) : "d"(port));
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static inline u32 inl(u16 port)
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asm volatile ("inl %1, %0 \n" : "=a" (val) : "d"(port));
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static void conf12_init(struct pci_access *a)
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static void conf12_cleanup(struct pci_access *a UNUSED)
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* Before we decide to use direct hardware access mechanisms, we try to do some
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* trivial checks to ensure it at least _seems_ to be working -- we just test
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* whether bus 00 contains a host bridge (this is similar to checking
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* techniques used in XFree86, but ours should be more reliable since we
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* attempt to make use of direct access hints provided by the PCI BIOS).
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* This should be close to trivial, but it isn't, because there are buggy
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* chipsets (yes, you guessed it, by Intel and Compaq) that have no class ID.
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static int intel_sanity_check(struct pci_access *a, struct pci_methods *m)
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a->debug("...sanity check");
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for (d.dev = 0; d.dev < 32; d.dev++) {
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if ((m->read(&d, PCI_CLASS_DEVICE, (byte *) & class,
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&& (class == cpu_to_le16(PCI_CLASS_BRIDGE_HOST)
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|| class == cpu_to_le16(PCI_CLASS_DISPLAY_VGA)))
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|| (m->read(&d, PCI_VENDOR_ID, (byte *) & vendor,
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&& (vendor == cpu_to_le16(PCI_VENDOR_ID_INTEL)
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|| vendor == cpu_to_le16(PCI_VENDOR_ID_COMPAQ)))) {
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a->debug("...outside the Asylum at 0/%02x/0",
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a->debug("...insane");
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* Configuration type 1
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#define CONFIG_CMD(bus, device_fn, where) (0x80000000 | (bus << 16) | (device_fn << 8) | (where & ~3))
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static int conf1_detect(struct pci_access *a)
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outl(0x80000000, 0xCF8);
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if (inl(0xCF8) == 0x80000000)
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res = intel_sanity_check(a, &pm_intel_conf1);
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static int conf1_read(struct pci_dev *d, int pos, byte * buf, int len)
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int addr = 0xcfc + (pos & 3);
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outl(0x80000000 | ((d->bus & 0xff) << 16) |
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(PCI_DEVFN(d->dev, d->func) << 8) | (pos & ~3), 0xcf8);
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((u16 *) buf)[0] = cpu_to_le16(inw(addr));
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((u32 *) buf)[0] = cpu_to_le32(inl(addr));
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return pci_generic_block_read(d, pos, buf, len);
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static int conf1_write(struct pci_dev *d, int pos, byte * buf, int len)
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int addr = 0xcfc + (pos & 3);
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outl(0x80000000 | ((d->bus & 0xff) << 16) |
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(PCI_DEVFN(d->dev, d->func) << 8) | (pos & ~3), 0xcf8);
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outw(le16_to_cpu(((u16 *) buf)[0]), addr);
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outl(le32_to_cpu(((u32 *) buf)[0]), addr);
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return pci_generic_block_write(d, pos, buf, len);
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* Configuration type 2. Obsolete and brain-damaged, but existing.
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static int conf2_detect(struct pci_access *a)
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/* This is ugly and tends to produce false positives. Beware. */
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if (inb(0xCF8) == 0x00 && inb(0xCFA) == 0x00)
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return intel_sanity_check(a, &pm_intel_conf2);
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static int conf2_read(struct pci_dev *d, int pos, byte * buf, int len)
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int addr = 0xc000 | (d->dev << 8) | pos;
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/* conf2 supports only 16 devices per bus */
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outb((d->func << 1) | 0xf0, 0xcf8);
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((u16 *) buf)[0] = cpu_to_le16(inw(addr));
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((u32 *) buf)[0] = cpu_to_le32(inl(addr));
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return pci_generic_block_read(d, pos, buf, len);
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static int conf2_write(struct pci_dev *d, int pos, byte * buf, int len)
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int addr = 0xc000 | (d->dev << 8) | pos;
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d->access->error("conf2_write: only first 16 devices exist.");
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outb((d->func << 1) | 0xf0, 0xcf8);
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outw(le16_to_cpu(*(u16 *) buf), addr);
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outl(le32_to_cpu(*(u32 *) buf), addr);
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return pci_generic_block_write(d, pos, buf, len);
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struct pci_methods pm_intel_conf1 = {
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pci_generic_fill_info,
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NULL /* cleanup_dev */
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struct pci_methods pm_intel_conf2 = {
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pci_generic_fill_info,
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NULL /* cleanup_dev */