mirror of
https://github.com/ipxe/ipxe
synced 2025-12-23 21:41:43 +03:00
Created a bus/device API that allows for the ROM prefix to specify an
initial device, and will also allow for e.g. a device menu to be presented to the user.
This commit is contained in:
Michael Brown
@@ -1,16 +1,9 @@
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#include "stdint.h"
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#include "string.h"
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#include "console.h"
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#include "nic.h"
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#include "pci.h"
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/*
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* Ensure that there is sufficient space in the shared dev_bus
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* structure for a struct pci_device.
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*
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*/
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DEV_BUS( struct pci_device, pci_dev );
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static char pci_magic[0]; /* guaranteed unique symbol */
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/*
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* pci_io.c may know how many buses we have, in which case it can
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* overwrite this value.
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@@ -18,13 +11,39 @@ static char pci_magic[0]; /* guaranteed unique symbol */
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*/
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unsigned int pci_max_bus = 0xff;
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/*
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* Increment a bus_loc structure to the next possible PCI location.
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* Leave the structure zeroed and return 0 if there are no more valid
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* locations.
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*
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*/
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static int pci_next_location ( struct bus_loc *bus_loc ) {
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struct pci_loc *pci_loc = ( struct pci_loc * ) bus_loc;
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/*
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* Ensure that there is sufficient space in the shared bus
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* structures for a struct pci_loc and a struct
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* pci_dev, as mandated by bus.h.
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*
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*/
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BUS_LOC_CHECK ( struct pci_loc );
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BUS_DEV_CHECK ( struct pci_device );
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return ( ++pci_loc->busdevfn );
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}
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/*
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* Fill in parameters (vendor & device ids, class, membase etc.) for a
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* PCI device based on bus & devfn.
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*
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* Returns 1 if a device was found, 0 for no device present.
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*
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*/
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static int fill_pci_device ( struct pci_device *pci ) {
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static int pci_fill_device ( struct bus_dev *bus_dev,
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struct bus_loc *bus_loc ) {
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struct pci_loc *pci_loc = ( struct pci_loc * ) bus_loc;
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struct pci_device *pci = ( struct pci_device * ) bus_dev;
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uint16_t busdevfn = pci_loc->busdevfn;
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static struct {
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uint16_t devfn0;
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int is_present;
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@@ -32,8 +51,12 @@ static int fill_pci_device ( struct pci_device *pci ) {
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uint32_t l;
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int reg;
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/* Store busdevfn in struct pci_device and set default values */
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pci->busdevfn = busdevfn;
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pci->name = "?";
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/* Check bus is within range */
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if ( PCI_BUS ( pci->busdevfn ) > pci_max_bus ) {
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if ( PCI_BUS ( busdevfn ) > pci_max_bus ) {
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return 0;
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}
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@@ -41,8 +64,8 @@ static int fill_pci_device ( struct pci_device *pci ) {
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* non-zero function on a non-existent card. This is done to
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* increase scan speed by a factor of 8.
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*/
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if ( ( PCI_FUNC ( pci->busdevfn ) != 0 ) &&
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( PCI_FN0 ( pci->busdevfn ) == cache.devfn0 ) &&
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if ( ( PCI_FUNC ( busdevfn ) != 0 ) &&
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( PCI_FN0 ( busdevfn ) == cache.devfn0 ) &&
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( ! cache.is_present ) ) {
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return 0;
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}
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@@ -52,28 +75,27 @@ static int fill_pci_device ( struct pci_device *pci ) {
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pci_read_config_dword ( pci, PCI_VENDOR_ID, &l );
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/* some broken boards return 0 if a slot is empty: */
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if ( ( l == 0xffffffff ) || ( l == 0x00000000 ) ) {
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if ( PCI_FUNC ( pci->busdevfn ) == 0 ) {
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if ( PCI_FUNC ( busdevfn ) == 0 ) {
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/* Don't look for subsequent functions if the
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* card itself is not present.
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*/
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cache.devfn0 = pci->busdevfn;
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cache.devfn0 = busdevfn;
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cache.is_present = 0;
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}
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return 0;
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}
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pci->vendor = l & 0xffff;
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pci->dev_id = ( l >> 16 ) & 0xffff;
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pci->vendor_id = l & 0xffff;
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pci->device_id = ( l >> 16 ) & 0xffff;
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/* Check that we're not a duplicate function on a
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* non-multifunction device.
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*/
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if ( PCI_FUNC ( pci->busdevfn ) != 0 ) {
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uint16_t save_busdevfn = pci->busdevfn;
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if ( PCI_FUNC ( busdevfn ) != 0 ) {
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uint8_t header_type;
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pci->busdevfn &= PCI_FN0 ( pci->busdevfn );
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pci->busdevfn &= PCI_FN0 ( busdevfn );
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pci_read_config_byte ( pci, PCI_HEADER_TYPE, &header_type );
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pci->busdevfn = save_busdevfn;
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pci->busdevfn = busdevfn;
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if ( ! ( header_type & 0x80 ) ) {
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return 0;
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@@ -108,14 +130,87 @@ static int fill_pci_device ( struct pci_device *pci ) {
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pci_read_config_byte ( pci, PCI_INTERRUPT_LINE, &pci->irq );
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}
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DBG ( "PCI found device %hhx:%hhx.%d Class %hx: %hx:%hx (rev %hhx)\n",
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DBG ( "found device %hhx:%hhx.%d Class %hx: %hx:%hx (rev %hhx)\n",
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PCI_BUS ( pci->busdevfn ), PCI_DEV ( pci->busdevfn ),
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PCI_FUNC ( pci->busdevfn ), pci->class, pci->vendor, pci->dev_id,
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pci->revision );
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PCI_FUNC ( pci->busdevfn ), pci->class, pci->vendor_id,
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pci->device_id, pci->revision );
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return 1;
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}
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/*
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* Test whether or not a driver is capable of driving the device.
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*
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*/
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static int pci_check_driver ( struct bus_dev *bus_dev,
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struct device_driver *device_driver ) {
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struct pci_device *pci = ( struct pci_device * ) bus_dev;
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struct pci_driver_info *pci_driver_info
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= ( struct pci_driver_info * ) device_driver->bus_driver_info;
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unsigned int i;
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/* If driver has a class, and class matches, use it */
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if ( pci_driver_info->class &&
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( pci_driver_info->class == pci->class ) ) {
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DBG ( "driver %s matches class %hx\n",
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device_driver->name, pci_driver_info->class );
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pci->name = device_driver->name;
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return 1;
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}
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/* If any of driver's IDs match, use it */
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for ( i = 0 ; i < pci_driver_info->id_count; i++ ) {
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struct pci_id *id = &pci_driver_info->ids[i];
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if ( ( pci->vendor_id == id->vendor_id ) &&
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( pci->device_id == id->device_id ) ) {
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DBG ( "driver %s device %s matches ID %hx:%hx\n",
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device_driver->name, id->name,
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id->vendor_id, id->device_id );
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pci->name = id->name;
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return 1;
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}
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}
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return 0;
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}
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/*
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* Describe a PCI device
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*
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*/
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static char * pci_describe ( struct bus_dev *bus_dev ) {
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struct pci_device *pci = ( struct pci_device * ) bus_dev;
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static char pci_description[] = "PCI 00:00.0";
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sprintf ( pci_description + 4, "%hhx:%hhx.%d",
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PCI_BUS ( pci->busdevfn ), PCI_DEV ( pci->busdevfn ),
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PCI_FUNC ( pci->busdevfn ) );
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return pci_description;
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}
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/*
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* Name a PCI device
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*
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*/
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static char * pci_name ( struct bus_dev *bus_dev ) {
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struct pci_device *pci = ( struct pci_device * ) bus_dev;
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return pci->name;
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}
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/*
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* PCI bus operations table
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*
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*/
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struct bus_driver pci_driver __bus_driver = {
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.next_location = pci_next_location,
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.fill_device = pci_fill_device,
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.check_driver = pci_check_driver,
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.describe = pci_describe,
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.name = pci_name,
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};
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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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@@ -127,7 +222,7 @@ void adjust_pci_device ( struct pci_device *pci ) {
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pci_read_config_word ( pci, PCI_COMMAND, &pci_command );
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new_command = pci_command | PCI_COMMAND_MASTER | PCI_COMMAND_IO;
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if ( pci_command != new_command ) {
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DBG ( "PCI BIOS has not enabled device %hhx:%hhx.%d! "
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DBG ( "BIOS has not enabled device %hhx:%hhx.%d! "
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"Updating PCI command %hX->%hX\n",
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PCI_BUS ( pci->busdevfn ), PCI_DEV ( pci->busdevfn ),
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PCI_FUNC ( pci->busdevfn ), pci_command, new_command );
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@@ -135,7 +230,7 @@ void adjust_pci_device ( struct pci_device *pci ) {
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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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DBG ( "PCI device %hhx:%hhx.%d latency timer is "
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DBG ( "device %hhx:%hhx.%d latency timer is "
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"unreasonably low at %d. Setting to 32.\n",
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PCI_BUS ( pci->busdevfn ), PCI_DEV ( pci->busdevfn ),
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PCI_FUNC ( pci->busdevfn ), pci_latency );
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@@ -143,100 +238,6 @@ void adjust_pci_device ( struct pci_device *pci ) {
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}
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}
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/*
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* Set PCI device to use.
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*
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* This routine can be called by e.g. the ROM prefix to specify that
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* the first device to be tried should be the device on which the ROM
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* was physically located.
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*
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*/
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void set_pci_device ( uint16_t busdevfn ) {
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pci_dev.magic = pci_magic;
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pci_dev.busdevfn = busdevfn;
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pci_dev.already_tried = 0;
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}
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/*
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* Find a PCI device matching the specified driver
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*
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*/
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int find_pci_device ( struct pci_device *pci,
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struct pci_driver *driver ) {
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int i;
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/* Initialise struct pci if it's the first time it's been used. */
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if ( pci->magic != pci_magic ) {
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memset ( pci, 0, sizeof ( *pci ) );
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pci->magic = pci_magic;
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}
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/* Iterate through all possible PCI bus:dev.fn combinations,
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* starting where we left off.
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*/
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DBG ( "PCI searching for device matching driver %s\n", driver->name );
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do {
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/* If we've already used this device, skip it */
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if ( pci->already_tried ) {
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pci->already_tried = 0;
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continue;
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}
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/* Fill in device parameters, if device present */
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if ( ! fill_pci_device ( pci ) ) {
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continue;
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}
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/* If driver has a class, and class matches, use it */
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if ( driver->class &&
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( driver->class == pci->class ) ) {
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DBG ( "PCI found class %hx matching driver %s\n",
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driver->class, driver->name );
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pci->name = driver->name;
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pci->already_tried = 1;
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return 1;
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}
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/* If any of driver's IDs match, use it */
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for ( i = 0 ; i < driver->id_count; i++ ) {
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struct pci_id *id = &driver->ids[i];
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if ( ( pci->vendor == id->vendor ) &&
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( pci->dev_id == id->dev_id ) ) {
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DBG ( "PCI found ID %hx:%hx (device %s) "
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"matching driver %s\n", id->vendor,
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id->dev_id, id->name, driver->name );
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pci->name = id->name;
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pci->already_tried = 1;
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return 1;
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}
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}
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} while ( ++pci->busdevfn );
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/* No device found */
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DBG ( "PCI found no device matching driver %s\n", driver->name );
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return 0;
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}
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/*
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* Find the next PCI device that can be used to boot using the
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* specified driver.
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*
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*/
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int find_pci_boot_device ( struct dev *dev, struct pci_driver *driver ) {
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struct pci_device *pci = ( struct pci_device * )dev->bus;
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if ( ! find_pci_device ( pci, driver ) )
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return 0;
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dev->name = pci->name;
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dev->devid.bus_type = PCI_BUS_TYPE;
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dev->devid.vendor_id = pci->vendor;
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dev->devid.device_id = pci->dev_id;
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return 1;
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}
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/*
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* Find the start of a pci resource.
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*/
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@@ -346,3 +347,19 @@ int pci_find_capability ( struct pci_device *pci, int cap ) {
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}
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return 0;
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}
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/*
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* Fill in a DHCP device ID structure
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*
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*/
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void pci_fill_nic ( struct nic *nic, struct pci_device *pci ) {
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/* Fill in ioaddr and irqno */
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nic->ioaddr = pci->ioaddr;
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nic->irqno = pci->irq;
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/* Fill in DHCP device ID structure */
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nic->dhcp_dev_id.bus_type = PCI_BUS_TYPE;
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nic->dhcp_dev_id.vendor_id = htons ( pci->vendor_id );
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nic->dhcp_dev_id.device_id = htons ( pci->device_id );
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}
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