400 lines
11 KiB
C
400 lines
11 KiB
C
/*
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* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* Based in part on pci.c from Etherboot 5.4, by Ken Yap and David
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* Munro, in turn based on the Linux kernel's PCI implementation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <ipxe/tables.h>
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#include <ipxe/device.h>
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#include <ipxe/pci.h>
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/** @file
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*
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* PCI bus
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*
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*/
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static void pcibus_remove ( struct root_device *rootdev );
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/**
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* Read PCI BAR
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*
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* @v pci PCI device
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* @v reg PCI register number
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* @ret bar Base address register
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*
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* Reads the specified PCI base address register, including the flags
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* portion. 64-bit BARs will be handled automatically. If the value
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* of the 64-bit BAR exceeds the size of an unsigned long (i.e. if the
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* high dword is non-zero on a 32-bit platform), then the value
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* returned will be zero plus the flags for a 64-bit BAR. Unreachable
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* 64-bit BARs are therefore returned as uninitialised 64-bit BARs.
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*/
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static unsigned long pci_bar ( struct pci_device *pci, unsigned int reg ) {
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uint32_t low;
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uint32_t high;
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pci_read_config_dword ( pci, reg, &low );
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if ( ( low & (PCI_BASE_ADDRESS_SPACE_IO|PCI_BASE_ADDRESS_MEM_TYPE_MASK))
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== PCI_BASE_ADDRESS_MEM_TYPE_64 ) {
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pci_read_config_dword ( pci, reg + 4, &high );
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if ( high ) {
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if ( sizeof ( unsigned long ) > sizeof ( uint32_t ) ) {
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return ( ( ( uint64_t ) high << 32 ) | low );
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} else {
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DBGC ( pci, PCI_FMT " unhandled 64-bit BAR "
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"%08x%08x\n",
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PCI_ARGS ( pci ), high, low );
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return PCI_BASE_ADDRESS_MEM_TYPE_64;
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}
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}
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}
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return low;
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}
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/**
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* Find the start of a PCI BAR
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*
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* @v pci PCI device
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* @v reg PCI register number
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* @ret start BAR start address
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*
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* Reads the specified PCI base address register, and returns the
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* address portion of the BAR (i.e. without the flags).
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*
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* If the address exceeds the size of an unsigned long (i.e. if a
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* 64-bit BAR has a non-zero high dword on a 32-bit machine), the
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* return value will be zero.
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*/
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unsigned long pci_bar_start ( struct pci_device *pci, unsigned int reg ) {
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unsigned long bar;
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bar = pci_bar ( pci, reg );
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if ( bar & PCI_BASE_ADDRESS_SPACE_IO ) {
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return ( bar & ~PCI_BASE_ADDRESS_IO_MASK );
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} else {
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return ( bar & ~PCI_BASE_ADDRESS_MEM_MASK );
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}
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}
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/**
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* Read membase and ioaddr for a PCI device
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*
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* @v pci PCI device
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*
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* This scans through all PCI BARs on the specified device. The first
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* valid memory BAR is recorded as pci_device::membase, and the first
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* valid IO BAR is recorded as pci_device::ioaddr.
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*
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* 64-bit BARs are handled automatically. On a 32-bit platform, if a
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* 64-bit BAR has a non-zero high dword, it will be regarded as
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* invalid.
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*/
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static void pci_read_bases ( struct pci_device *pci ) {
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unsigned long bar;
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int reg;
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for ( reg = PCI_BASE_ADDRESS_0; reg <= PCI_BASE_ADDRESS_5; reg += 4 ) {
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bar = pci_bar ( pci, reg );
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if ( bar & PCI_BASE_ADDRESS_SPACE_IO ) {
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if ( ! pci->ioaddr )
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pci->ioaddr =
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( bar & ~PCI_BASE_ADDRESS_IO_MASK );
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} else {
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if ( ! pci->membase )
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pci->membase =
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( bar & ~PCI_BASE_ADDRESS_MEM_MASK );
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/* Skip next BAR if 64-bit */
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if ( bar & PCI_BASE_ADDRESS_MEM_TYPE_64 )
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reg += 4;
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}
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}
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}
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/**
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* Enable PCI device
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*
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* @v pci PCI device
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*
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* Set device to be a busmaster in case BIOS neglected to do so. Also
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* adjust PCI latency timer to a reasonable value, 32.
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*/
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void adjust_pci_device ( struct pci_device *pci ) {
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unsigned short new_command, pci_command;
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unsigned char pci_latency;
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pci_read_config_word ( pci, PCI_COMMAND, &pci_command );
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new_command = ( pci_command | PCI_COMMAND_MASTER |
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PCI_COMMAND_MEM | PCI_COMMAND_IO );
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if ( pci_command != new_command ) {
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DBGC ( pci, PCI_FMT " device not enabled by BIOS! Updating "
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"PCI command %04x->%04x\n",
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PCI_ARGS ( pci ), pci_command, new_command );
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pci_write_config_word ( pci, PCI_COMMAND, new_command );
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}
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pci_read_config_byte ( pci, PCI_LATENCY_TIMER, &pci_latency);
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if ( pci_latency < 32 ) {
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DBGC ( pci, PCI_FMT " latency timer is unreasonably low at "
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"%d. Setting to 32.\n", PCI_ARGS ( pci ), pci_latency );
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pci_write_config_byte ( pci, PCI_LATENCY_TIMER, 32);
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}
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}
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/**
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* Read PCI device configuration
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*
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* @v pci PCI device
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* @ret rc Return status code
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*/
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int pci_read_config ( struct pci_device *pci ) {
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uint32_t busdevfn;
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uint8_t hdrtype;
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uint32_t tmp;
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/* Ignore all but the first function on non-multifunction devices */
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if ( PCI_FUNC ( pci->busdevfn ) != 0 ) {
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busdevfn = pci->busdevfn;
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pci->busdevfn = PCI_FIRST_FUNC ( pci->busdevfn );
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pci_read_config_byte ( pci, PCI_HEADER_TYPE, &hdrtype );
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pci->busdevfn = busdevfn;
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if ( ! ( hdrtype & PCI_HEADER_TYPE_MULTI ) )
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return -ENODEV;
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}
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/* Check for physical device presence */
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pci_read_config_dword ( pci, PCI_VENDOR_ID, &tmp );
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if ( ( tmp == 0xffffffff ) || ( tmp == 0 ) )
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return -ENODEV;
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/* Populate struct pci_device */
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pci->vendor = ( tmp & 0xffff );
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pci->device = ( tmp >> 16 );
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pci_read_config_dword ( pci, PCI_REVISION, &tmp );
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pci->class = ( tmp >> 8 );
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pci_read_config_byte ( pci, PCI_INTERRUPT_LINE, &pci->irq );
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pci_read_bases ( pci );
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/* Initialise generic device component */
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snprintf ( pci->dev.name, sizeof ( pci->dev.name ), "%04x:%02x:%02x.%x",
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PCI_SEG ( pci->busdevfn ), PCI_BUS ( pci->busdevfn ),
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PCI_SLOT ( pci->busdevfn ), PCI_FUNC ( pci->busdevfn ) );
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pci->dev.desc.bus_type = BUS_TYPE_PCI;
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pci->dev.desc.location = pci->busdevfn;
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pci->dev.desc.vendor = pci->vendor;
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pci->dev.desc.device = pci->device;
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pci->dev.desc.class = pci->class;
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pci->dev.desc.ioaddr = pci->ioaddr;
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pci->dev.desc.irq = pci->irq;
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INIT_LIST_HEAD ( &pci->dev.siblings );
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INIT_LIST_HEAD ( &pci->dev.children );
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return 0;
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}
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/**
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* Find next device on PCI bus
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*
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* @v pci PCI device to fill in
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* @v busdevfn Starting bus:dev.fn address
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* @ret busdevfn Bus:dev.fn address of next PCI device, or negative error
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*/
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int pci_find_next ( struct pci_device *pci, unsigned int busdevfn ) {
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static unsigned int end;
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int rc;
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/* Determine number of PCI buses */
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if ( ! end )
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end = PCI_BUSDEVFN ( 0, pci_num_bus(), 0, 0 );
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/* Find next PCI device, if any */
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for ( ; busdevfn < end ; busdevfn++ ) {
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memset ( pci, 0, sizeof ( *pci ) );
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pci_init ( pci, busdevfn );
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if ( ( rc = pci_read_config ( pci ) ) == 0 )
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return busdevfn;
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}
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return -ENODEV;
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}
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/**
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* Find driver for PCI device
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*
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* @v pci PCI device
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* @ret rc Return status code
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*/
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int pci_find_driver ( struct pci_device *pci ) {
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struct pci_driver *driver;
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struct pci_device_id *id;
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unsigned int i;
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for_each_table_entry ( driver, PCI_DRIVERS ) {
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if ( ( driver->class.class ^ pci->class ) & driver->class.mask )
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continue;
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for ( i = 0 ; i < driver->id_count ; i++ ) {
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id = &driver->ids[i];
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if ( ( id->vendor != PCI_ANY_ID ) &&
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( id->vendor != pci->vendor ) )
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continue;
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if ( ( id->device != PCI_ANY_ID ) &&
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( id->device != pci->device ) )
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continue;
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pci_set_driver ( pci, driver, id );
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return 0;
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}
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}
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return -ENOENT;
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}
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/**
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* Probe a PCI device
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*
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* @v pci PCI device
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* @ret rc Return status code
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*
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* Searches for a driver for the PCI device. If a driver is found,
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* its probe() routine is called.
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*/
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int pci_probe ( struct pci_device *pci ) {
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int rc;
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DBGC ( pci, PCI_FMT " (%04x:%04x) has driver \"%s\"\n",
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PCI_ARGS ( pci ), pci->vendor, pci->device, pci->id->name );
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DBGC ( pci, PCI_FMT " has mem %lx io %lx irq %d\n",
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PCI_ARGS ( pci ), pci->membase, pci->ioaddr, pci->irq );
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if ( ( rc = pci->driver->probe ( pci ) ) != 0 ) {
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DBGC ( pci, PCI_FMT " probe failed: %s\n",
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PCI_ARGS ( pci ), strerror ( rc ) );
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return rc;
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}
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return 0;
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}
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/**
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* Remove a PCI device
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*
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* @v pci PCI device
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*/
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void pci_remove ( struct pci_device *pci ) {
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pci->driver->remove ( pci );
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DBGC ( pci, PCI_FMT " removed\n", PCI_ARGS ( pci ) );
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}
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/**
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* Probe PCI root bus
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*
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* @v rootdev PCI bus root device
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*
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* Scans the PCI bus for devices and registers all devices it can
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* find.
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*/
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static int pcibus_probe ( struct root_device *rootdev ) {
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struct pci_device *pci = NULL;
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int busdevfn = 0;
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int rc;
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for ( busdevfn = 0 ; 1 ; busdevfn++ ) {
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/* Allocate struct pci_device */
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if ( ! pci )
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pci = malloc ( sizeof ( *pci ) );
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if ( ! pci ) {
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rc = -ENOMEM;
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goto err;
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}
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/* Find next PCI device, if any */
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busdevfn = pci_find_next ( pci, busdevfn );
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if ( busdevfn < 0 )
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break;
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/* Look for a driver */
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if ( ( rc = pci_find_driver ( pci ) ) != 0 ) {
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DBGC ( pci, PCI_FMT " (%04x:%04x class %06x) has no "
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"driver\n", PCI_ARGS ( pci ), pci->vendor,
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pci->device, pci->class );
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continue;
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}
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/* Add to device hierarchy */
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pci->dev.parent = &rootdev->dev;
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list_add ( &pci->dev.siblings, &rootdev->dev.children );
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/* Look for a driver */
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if ( ( rc = pci_probe ( pci ) ) == 0 ) {
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/* pcidev registered, we can drop our ref */
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pci = NULL;
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} else {
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/* Not registered; re-use struct pci_device */
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list_del ( &pci->dev.siblings );
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}
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}
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free ( pci );
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return 0;
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err:
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free ( pci );
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pcibus_remove ( rootdev );
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return rc;
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}
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/**
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* Remove PCI root bus
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*
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* @v rootdev PCI bus root device
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*/
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static void pcibus_remove ( struct root_device *rootdev ) {
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struct pci_device *pci;
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struct pci_device *tmp;
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list_for_each_entry_safe ( pci, tmp, &rootdev->dev.children,
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dev.siblings ) {
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pci_remove ( pci );
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list_del ( &pci->dev.siblings );
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free ( pci );
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}
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}
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/** PCI bus root device driver */
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static struct root_driver pci_root_driver = {
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.probe = pcibus_probe,
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.remove = pcibus_remove,
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};
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/** PCI bus root device */
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struct root_device pci_root_device __root_device = {
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.dev = { .name = "PCI" },
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.driver = &pci_root_driver,
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};
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