--- /dev/null
+/*
+ * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * Based in part on pci.c from Etherboot 5.4, by Ken Yap and David
+ * Munro, in turn based on the Linux kernel's PCI implementation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <ipxe/tables.h>
+#include <ipxe/device.h>
+#include <ipxe/pci.h>
+
+/** @file
+ *
+ * PCI bus
+ *
+ */
+
+static void pcibus_remove ( struct root_device *rootdev );
+
+/**
+ * Read PCI BAR
+ *
+ * @v pci PCI device
+ * @v reg PCI register number
+ * @ret bar Base address register
+ *
+ * Reads the specified PCI base address register, including the flags
+ * portion. 64-bit BARs will be handled automatically. If the value
+ * of the 64-bit BAR exceeds the size of an unsigned long (i.e. if the
+ * high dword is non-zero on a 32-bit platform), then the value
+ * returned will be zero plus the flags for a 64-bit BAR. Unreachable
+ * 64-bit BARs are therefore returned as uninitialised 64-bit BARs.
+ */
+static unsigned long pci_bar ( struct pci_device *pci, unsigned int reg ) {
+ uint32_t low;
+ uint32_t high;
+
+ pci_read_config_dword ( pci, reg, &low );
+ if ( ( low & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK) )
+ == (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64) ){
+ pci_read_config_dword ( pci, reg + 4, &high );
+ if ( high ) {
+ if ( sizeof ( unsigned long ) > sizeof ( uint32_t ) ) {
+ return ( ( ( uint64_t ) high << 32 ) | low );
+ } else {
+ DBGC ( pci, PCI_FMT " unhandled 64-bit BAR "
+ "%08x%08x\n",
+ PCI_ARGS ( pci ), high, low );
+ return PCI_BASE_ADDRESS_MEM_TYPE_64;
+ }
+ }
+ }
+ return low;
+}
+
+/**
+ * Find the start of a PCI BAR
+ *
+ * @v pci PCI device
+ * @v reg PCI register number
+ * @ret start BAR start address
+ *
+ * Reads the specified PCI base address register, and returns the
+ * address portion of the BAR (i.e. without the flags).
+ *
+ * If the address exceeds the size of an unsigned long (i.e. if a
+ * 64-bit BAR has a non-zero high dword on a 32-bit machine), the
+ * return value will be zero.
+ */
+unsigned long pci_bar_start ( struct pci_device *pci, unsigned int reg ) {
+ unsigned long bar;
+
+ bar = pci_bar ( pci, reg );
+ if ( (bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_MEMORY ){
+ return ( bar & PCI_BASE_ADDRESS_MEM_MASK );
+ } else {
+ return ( bar & PCI_BASE_ADDRESS_IO_MASK );
+ }
+}
+
+/**
+ * Read membase and ioaddr for a PCI device
+ *
+ * @v pci PCI device
+ *
+ * This scans through all PCI BARs on the specified device. The first
+ * valid memory BAR is recorded as pci_device::membase, and the first
+ * valid IO BAR is recorded as pci_device::ioaddr.
+ *
+ * 64-bit BARs are handled automatically. On a 32-bit platform, if a
+ * 64-bit BAR has a non-zero high dword, it will be regarded as
+ * invalid.
+ */
+static void pci_read_bases ( struct pci_device *pci ) {
+ unsigned long bar;
+ int reg;
+
+ for ( reg = PCI_BASE_ADDRESS_0; reg <= PCI_BASE_ADDRESS_5; reg += 4 ) {
+ bar = pci_bar ( pci, reg );
+ if ( bar & PCI_BASE_ADDRESS_SPACE_IO ) {
+ if ( ! pci->ioaddr )
+ pci->ioaddr =
+ ( bar & PCI_BASE_ADDRESS_IO_MASK );
+ } else {
+ if ( ! pci->membase )
+ pci->membase =
+ ( bar & PCI_BASE_ADDRESS_MEM_MASK );
+ /* Skip next BAR if 64-bit */
+ if ( bar & PCI_BASE_ADDRESS_MEM_TYPE_64 )
+ reg += 4;
+ }
+ }
+}
+
+/**
+ * Enable PCI device
+ *
+ * @v pci PCI device
+ *
+ * Set device to be a busmaster in case BIOS neglected to do so. Also
+ * adjust PCI latency timer to a reasonable value, 32.
+ */
+void adjust_pci_device ( struct pci_device *pci ) {
+ unsigned short new_command, pci_command;
+ unsigned char pci_latency;
+
+ pci_read_config_word ( pci, PCI_COMMAND, &pci_command );
+ new_command = ( pci_command | PCI_COMMAND_MASTER |
+ PCI_COMMAND_MEM | PCI_COMMAND_IO );
+ if ( pci_command != new_command ) {
+ DBGC ( pci, PCI_FMT " device not enabled by BIOS! Updating "
+ "PCI command %04x->%04x\n",
+ PCI_ARGS ( pci ), pci_command, new_command );
+ pci_write_config_word ( pci, PCI_COMMAND, new_command );
+ }
+
+ pci_read_config_byte ( pci, PCI_LATENCY_TIMER, &pci_latency);
+ if ( pci_latency < 32 ) {
+ DBGC ( pci, PCI_FMT " latency timer is unreasonably low at "
+ "%d. Setting to 32.\n", PCI_ARGS ( pci ), pci_latency );
+ pci_write_config_byte ( pci, PCI_LATENCY_TIMER, 32);
+ }
+}
+
+/**
+ * Read PCI device configuration
+ *
+ * @v pci PCI device
+ * @ret rc Return status code
+ */
+int pci_read_config ( struct pci_device *pci ) {
+ uint16_t busdevfn;
+ uint8_t hdrtype;
+ uint32_t tmp;
+
+ /* Ignore all but the first function on non-multifunction devices */
+ if ( PCI_FUNC ( pci->busdevfn ) != 0 ) {
+ busdevfn = pci->busdevfn;
+ pci->busdevfn = PCI_FIRST_FUNC ( pci->busdevfn );
+ pci_read_config_byte ( pci, PCI_HEADER_TYPE, &hdrtype );
+ pci->busdevfn = busdevfn;
+ if ( ! ( hdrtype & 0x80 ) )
+ return -ENODEV;
+ }
+
+ /* Check for physical device presence */
+ pci_read_config_dword ( pci, PCI_VENDOR_ID, &tmp );
+ if ( ( tmp == 0xffffffff ) || ( tmp == 0 ) )
+ return -ENODEV;
+
+ /* Populate struct pci_device */
+ pci->vendor = ( tmp & 0xffff );
+ pci->device = ( tmp >> 16 );
+ pci_read_config_dword ( pci, PCI_REVISION, &tmp );
+ pci->class = ( tmp >> 8 );
+ pci_read_config_byte ( pci, PCI_INTERRUPT_LINE, &pci->irq );
+ pci_read_bases ( pci );
+
+ /* Initialise generic device component */
+ snprintf ( pci->dev.name, sizeof ( pci->dev.name ),
+ "PCI%02x:%02x.%x", PCI_BUS ( pci->busdevfn ),
+ PCI_SLOT ( pci->busdevfn ), PCI_FUNC ( pci->busdevfn ) );
+ pci->dev.desc.bus_type = BUS_TYPE_PCI;
+ pci->dev.desc.location = pci->busdevfn;
+ pci->dev.desc.vendor = pci->vendor;
+ pci->dev.desc.device = pci->device;
+ pci->dev.desc.class = pci->class;
+ pci->dev.desc.ioaddr = pci->ioaddr;
+ pci->dev.desc.irq = pci->irq;
+ INIT_LIST_HEAD ( &pci->dev.siblings );
+ INIT_LIST_HEAD ( &pci->dev.children );
+
+ return 0;
+}
+
+/**
+ * Find next device on PCI bus
+ *
+ * @v pci PCI device to fill in
+ * @v busdevfn Starting bus:dev.fn address
+ * @ret busdevfn Bus:dev.fn address of next PCI device, or negative error
+ */
+int pci_find_next ( struct pci_device *pci, unsigned int busdevfn ) {
+ static unsigned int end;
+ int rc;
+
+ /* Determine number of PCI buses */
+ if ( ! end )
+ end = PCI_BUSDEVFN ( pci_num_bus(), 0, 0 );
+
+ /* Find next PCI device, if any */
+ for ( ; busdevfn < end ; busdevfn++ ) {
+ memset ( pci, 0, sizeof ( *pci ) );
+ pci_init ( pci, busdevfn );
+ if ( ( rc = pci_read_config ( pci ) ) == 0 )
+ return busdevfn;
+ }
+
+ return -ENODEV;
+}
+
+/**
+ * Find driver for PCI device
+ *
+ * @v pci PCI device
+ * @ret rc Return status code
+ */
+int pci_find_driver ( struct pci_device *pci ) {
+ struct pci_driver *driver;
+ struct pci_device_id *id;
+ unsigned int i;
+
+ for_each_table_entry ( driver, PCI_DRIVERS ) {
+ for ( i = 0 ; i < driver->id_count ; i++ ) {
+ id = &driver->ids[i];
+ if ( ( id->vendor != PCI_ANY_ID ) &&
+ ( id->vendor != pci->vendor ) )
+ continue;
+ if ( ( id->device != PCI_ANY_ID ) &&
+ ( id->device != pci->device ) )
+ continue;
+ pci_set_driver ( pci, driver, id );
+ return 0;
+ }
+ }
+ return -ENOENT;
+}
+
+/**
+ * Probe a PCI device
+ *
+ * @v pci PCI device
+ * @ret rc Return status code
+ *
+ * Searches for a driver for the PCI device. If a driver is found,
+ * its probe() routine is called.
+ */
+int pci_probe ( struct pci_device *pci ) {
+ int rc;
+
+ DBGC ( pci, PCI_FMT " (%04x:%04x) has driver \"%s\"\n",
+ PCI_ARGS ( pci ), pci->vendor, pci->device, pci->id->name );
+ DBGC ( pci, PCI_FMT " has mem %lx io %lx irq %d\n",
+ PCI_ARGS ( pci ), pci->membase, pci->ioaddr, pci->irq );
+
+ if ( ( rc = pci->driver->probe ( pci ) ) != 0 ) {
+ DBGC ( pci, PCI_FMT " probe failed: %s\n",
+ PCI_ARGS ( pci ), strerror ( rc ) );
+ return rc;
+ }
+
+ return 0;
+}
+
+/**
+ * Remove a PCI device
+ *
+ * @v pci PCI device
+ */
+void pci_remove ( struct pci_device *pci ) {
+ pci->driver->remove ( pci );
+ DBGC ( pci, PCI_FMT " removed\n", PCI_ARGS ( pci ) );
+}
+
+/**
+ * Probe PCI root bus
+ *
+ * @v rootdev PCI bus root device
+ *
+ * Scans the PCI bus for devices and registers all devices it can
+ * find.
+ */
+static int pcibus_probe ( struct root_device *rootdev ) {
+ struct pci_device *pci = NULL;
+ int busdevfn = 0;
+ int rc;
+
+ for ( busdevfn = 0 ; 1 ; busdevfn++ ) {
+
+ /* Allocate struct pci_device */
+ if ( ! pci )
+ pci = malloc ( sizeof ( *pci ) );
+ if ( ! pci ) {
+ rc = -ENOMEM;
+ goto err;
+ }
+
+ /* Find next PCI device, if any */
+ busdevfn = pci_find_next ( pci, busdevfn );
+ if ( busdevfn < 0 )
+ break;
+
+ /* Look for a driver */
+ if ( ( rc = pci_find_driver ( pci ) ) != 0 ) {
+ DBGC ( pci, PCI_FMT " (%04x:%04x) has no driver\n",
+ PCI_ARGS ( pci ), pci->vendor, pci->device );
+ continue;
+ }
+
+ /* Add to device hierarchy */
+ pci->dev.parent = &rootdev->dev;
+ list_add ( &pci->dev.siblings, &rootdev->dev.children);
+
+ /* Look for a driver */
+ if ( ( rc = pci_probe ( pci ) ) == 0 ) {
+ /* pcidev registered, we can drop our ref */
+ pci = NULL;
+ } else {
+ /* Not registered; re-use struct pci_device */
+ list_del ( &pci->dev.siblings );
+ }
+ }
+
+ free ( pci );
+ return 0;
+
+ err:
+ free ( pci );
+ pcibus_remove ( rootdev );
+ return rc;
+}
+
+/**
+ * Remove PCI root bus
+ *
+ * @v rootdev PCI bus root device
+ */
+static void pcibus_remove ( struct root_device *rootdev ) {
+ struct pci_device *pci;
+ struct pci_device *tmp;
+
+ list_for_each_entry_safe ( pci, tmp, &rootdev->dev.children,
+ dev.siblings ) {
+ pci_remove ( pci );
+ list_del ( &pci->dev.siblings );
+ free ( pci );
+ }
+}
+
+/** PCI bus root device driver */
+static struct root_driver pci_root_driver = {
+ .probe = pcibus_probe,
+ .remove = pcibus_remove,
+};
+
+/** PCI bus root device */
+struct root_device pci_root_device __root_device = {
+ .dev = { .name = "PCI" },
+ .driver = &pci_root_driver,
+};
Code Review / kvmfornfv.git / blobdiff