86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2011 The Chromium OS Authors.
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* (C) Copyright 2008,2009
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* Graeme Russ, <graeme.russ@gmail.com>
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*
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* (C) Copyright 2002
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* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <malloc.h>
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#include <pci.h>
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#include <asm/io.h>
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#include <asm/pci.h>
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int pci_x86_read_config(struct udevice *bus, pci_dev_t bdf, uint offset,
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ulong *valuep, enum pci_size_t size)
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{
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outl(bdf | (offset & 0xfc) | PCI_CFG_EN, PCI_REG_ADDR);
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switch (size) {
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case PCI_SIZE_8:
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*valuep = inb(PCI_REG_DATA + (offset & 3));
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break;
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case PCI_SIZE_16:
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*valuep = inw(PCI_REG_DATA + (offset & 2));
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break;
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case PCI_SIZE_32:
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*valuep = inl(PCI_REG_DATA);
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break;
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}
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return 0;
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}
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int pci_x86_write_config(struct udevice *bus, pci_dev_t bdf, uint offset,
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ulong value, enum pci_size_t size)
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{
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outl(bdf | (offset & 0xfc) | PCI_CFG_EN, PCI_REG_ADDR);
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switch (size) {
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case PCI_SIZE_8:
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outb(value, PCI_REG_DATA + (offset & 3));
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break;
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case PCI_SIZE_16:
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outw(value, PCI_REG_DATA + (offset & 2));
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break;
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case PCI_SIZE_32:
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outl(value, PCI_REG_DATA);
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break;
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}
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return 0;
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}
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void pci_assign_irqs(int bus, int device, u8 irq[4])
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{
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pci_dev_t bdf;
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int func;
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u16 vendor;
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u8 pin, line;
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for (func = 0; func < 8; func++) {
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bdf = PCI_BDF(bus, device, func);
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pci_read_config16(bdf, PCI_VENDOR_ID, &vendor);
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if (vendor == 0xffff || vendor == 0x0000)
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continue;
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pci_read_config8(bdf, PCI_INTERRUPT_PIN, &pin);
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/* PCI spec says all values except 1..4 are reserved */
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if ((pin < 1) || (pin > 4))
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continue;
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line = irq[pin - 1];
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if (!line)
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continue;
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debug("Assigning IRQ %d to PCI device %d.%x.%d (INT%c)\n",
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line, bus, device, func, 'A' + pin - 1);
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pci_write_config8(bdf, PCI_INTERRUPT_LINE, line);
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}
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}
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