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+/**************************************************************************
+*
+* isapnp.c -- Etherboot isapnp support for the 3Com 3c515
+* Written 2002-2003 by Timothy Legge <tlegge@rogers.com>
+*
+* 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
+* (at your option) 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*
+* Portions of this code:
+* Copyright (C) 2001 P.J.H.Fox (fox@roestock.demon.co.uk)
+*
+*
+* REVISION HISTORY:
+* ================
+* Version 0.1 April 26, 2002 TJL
+* Version 0.2 01/08/2003 TJL Moved outside the 3c515.c driver file
+* Version 0.3 Sept 23, 2003 timlegge Change delay to currticks
+*
+*
+* Generalised into an ISAPnP bus that can be used by more than just
+* the 3c515 by Michael Brown <mbrown@fensystems.co.uk>
+*
+***************************************************************************/
+
+/** @file
+ *
+ * ISAPnP bus support
+ *
+ * Etherboot orignally gained ISAPnP support in a very limited way for
+ * the 3c515 NIC. The current implementation is almost a complete
+ * rewrite based on the ISAPnP specification, with passing reference
+ * to the Linux ISAPnP code.
+ *
+ * There can be only one ISAPnP bus in a system. Once the read port
+ * is known and all cards have been allocated CSNs, there's nothing to
+ * be gained by re-scanning for cards.
+ *
+ * External code (e.g. the ISAPnP ROM prefix) may already know the
+ * read port address, in which case it can store it in
+ * #isapnp_read_port. Note that setting the read port address in this
+ * way will prevent further isolation from taking place; you should
+ * set the read port address only if you know that devices have
+ * already been allocated CSNs.
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <gpxe/io.h>
+#include <unistd.h>
+#include <gpxe/isapnp.h>
+
+/**
+ * ISAPnP Read Port address.
+ *
+ * ROM prefix may be able to set this address, which is why this is
+ * non-static.
+ */
+uint16_t isapnp_read_port;
+
+static void isapnpbus_remove ( struct root_device *rootdev );
+
+/*
+ * ISAPnP utility functions
+ *
+ */
+
+#define ISAPNP_CARD_ID_FMT "ID %04x:%04x (\"%s\") serial %x"
+#define ISAPNP_CARD_ID_DATA(identifier) \
+ (identifier)->vendor_id, (identifier)->prod_id, \
+ isa_id_string ( (identifier)->vendor_id, (identifier)->prod_id ), \
+ (identifier)->serial
+#define ISAPNP_DEV_ID_FMT "ID %04x:%04x (\"%s\")"
+#define ISAPNP_DEV_ID_DATA(isapnp) \
+ (isapnp)->vendor_id, (isapnp)->prod_id, \
+ isa_id_string ( (isapnp)->vendor_id, (isapnp)->prod_id )
+
+static inline void isapnp_write_address ( unsigned int address ) {
+ outb ( address, ISAPNP_ADDRESS );
+}
+
+static inline void isapnp_write_data ( unsigned int data ) {
+ outb ( data, ISAPNP_WRITE_DATA );
+}
+
+static inline unsigned int isapnp_read_data ( void ) {
+ return inb ( isapnp_read_port );
+}
+
+static inline void isapnp_write_byte ( unsigned int address,
+ unsigned int value ) {
+ isapnp_write_address ( address );
+ isapnp_write_data ( value );
+}
+
+static inline unsigned int isapnp_read_byte ( unsigned int address ) {
+ isapnp_write_address ( address );
+ return isapnp_read_data ();
+}
+
+static inline unsigned int isapnp_read_word ( unsigned int address ) {
+ /* Yes, they're in big-endian order */
+ return ( ( isapnp_read_byte ( address ) << 8 )
+ | isapnp_read_byte ( address + 1 ) );
+}
+
+/** Inform cards of a new read port address */
+static inline void isapnp_set_read_port ( void ) {
+ isapnp_write_byte ( ISAPNP_READPORT, ( isapnp_read_port >> 2 ) );
+}
+
+/**
+ * Enter the Isolation state.
+ *
+ * Only cards currently in the Sleep state will respond to this
+ * command.
+ */
+static inline void isapnp_serialisolation ( void ) {
+ isapnp_write_address ( ISAPNP_SERIALISOLATION );
+}
+
+/**
+ * Enter the Wait for Key state.
+ *
+ * All cards will respond to this command, regardless of their current
+ * state.
+ */
+static inline void isapnp_wait_for_key ( void ) {
+ isapnp_write_byte ( ISAPNP_CONFIGCONTROL, ISAPNP_CONFIG_WAIT_FOR_KEY );
+}
+
+/**
+ * Reset (i.e. remove) Card Select Number.
+ *
+ * Only cards currently in the Sleep state will respond to this
+ * command.
+ */
+static inline void isapnp_reset_csn ( void ) {
+ isapnp_write_byte ( ISAPNP_CONFIGCONTROL, ISAPNP_CONFIG_RESET_CSN );
+}
+
+/**
+ * Place a specified card into the Config state.
+ *
+ * @v csn Card Select Number
+ * @ret None -
+ * @err None -
+ *
+ * Only cards currently in the Sleep, Isolation, or Config states will
+ * respond to this command. The card that has the specified CSN will
+ * enter the Config state, all other cards will enter the Sleep state.
+ */
+static inline void isapnp_wake ( uint8_t csn ) {
+ isapnp_write_byte ( ISAPNP_WAKE, csn );
+}
+
+static inline unsigned int isapnp_read_resourcedata ( void ) {
+ return isapnp_read_byte ( ISAPNP_RESOURCEDATA );
+}
+
+static inline unsigned int isapnp_read_status ( void ) {
+ return isapnp_read_byte ( ISAPNP_STATUS );
+}
+
+/**
+ * Assign a Card Select Number to a card, and enter the Config state.
+ *
+ * @v csn Card Select Number
+ *
+ * Only cards in the Isolation state will respond to this command.
+ * The isolation protocol is designed so that only one card will
+ * remain in the Isolation state by the time the isolation protocol
+ * completes.
+ */
+static inline void isapnp_write_csn ( unsigned int csn ) {
+ isapnp_write_byte ( ISAPNP_CARDSELECTNUMBER, csn );
+}
+
+static inline void isapnp_logicaldevice ( unsigned int logdev ) {
+ isapnp_write_byte ( ISAPNP_LOGICALDEVICENUMBER, logdev );
+}
+
+static inline void isapnp_activate ( unsigned int logdev ) {
+ isapnp_logicaldevice ( logdev );
+ isapnp_write_byte ( ISAPNP_ACTIVATE, 1 );
+}
+
+static inline void isapnp_deactivate ( unsigned int logdev ) {
+ isapnp_logicaldevice ( logdev );
+ isapnp_write_byte ( ISAPNP_ACTIVATE, 0 );
+}
+
+static inline unsigned int isapnp_read_iobase ( unsigned int index ) {
+ return isapnp_read_word ( ISAPNP_IOBASE ( index ) );
+}
+
+static inline unsigned int isapnp_read_irqno ( unsigned int index ) {
+ return isapnp_read_byte ( ISAPNP_IRQNO ( index ) );
+}
+
+static void isapnp_delay ( void ) {
+ udelay ( 1000 );
+}
+
+/**
+ * Linear feedback shift register.
+ *
+ * @v lfsr Current value of the LFSR
+ * @v input_bit Current input bit to the LFSR
+ * @ret lfsr Next value of the LFSR
+ *
+ * This routine implements the linear feedback shift register as
+ * described in Appendix B of the PnP ISA spec. The hardware
+ * implementation uses eight D-type latches and two XOR gates. I
+ * think this is probably the smallest possible implementation in
+ * software. Six instructions when input_bit is a constant 0 (for
+ * isapnp_send_key). :)
+ */
+static inline unsigned int isapnp_lfsr_next ( unsigned int lfsr,
+ unsigned int input_bit ) {
+ register uint8_t lfsr_next;
+
+ lfsr_next = lfsr >> 1;
+ lfsr_next |= ( ( ( lfsr ^ lfsr_next ) ^ input_bit ) ) << 7;
+ return lfsr_next;
+}
+
+/**
+ * Send the ISAPnP initiation key.
+ *
+ * Sending the key causes all ISAPnP cards that are currently in the
+ * Wait for Key state to transition into the Sleep state.
+ */
+static void isapnp_send_key ( void ) {
+ unsigned int i;
+ unsigned int lfsr;
+
+ isapnp_delay();
+ isapnp_write_address ( 0x00 );
+ isapnp_write_address ( 0x00 );
+
+ lfsr = ISAPNP_LFSR_SEED;
+ for ( i = 0 ; i < 32 ; i++ ) {
+ isapnp_write_address ( lfsr );
+ lfsr = isapnp_lfsr_next ( lfsr, 0 );
+ }
+}
+
+/**
+ * Compute ISAPnP identifier checksum
+ *
+ * @v identifier ISAPnP identifier
+ * @ret checksum Expected checksum value
+ */
+static unsigned int isapnp_checksum ( struct isapnp_identifier *identifier ) {
+ unsigned int i, j;
+ unsigned int lfsr;
+ unsigned int byte;
+
+ lfsr = ISAPNP_LFSR_SEED;
+ for ( i = 0 ; i < 8 ; i++ ) {
+ byte = * ( ( ( uint8_t * ) identifier ) + i );
+ for ( j = 0 ; j < 8 ; j++ ) {
+ lfsr = isapnp_lfsr_next ( lfsr, byte );
+ byte >>= 1;
+ }
+ }
+ return lfsr;
+}
+
+/*
+ * Read a byte of resource data from the current location
+ *
+ * @ret byte Byte of resource data
+ */
+static inline unsigned int isapnp_peek_byte ( void ) {
+ unsigned int i;
+
+ /* Wait for data to be ready */
+ for ( i = 0 ; i < 20 ; i++ ) {
+ if ( isapnp_read_status() & 0x01 ) {
+ /* Byte ready - read it */
+ return isapnp_read_resourcedata();
+ }
+ isapnp_delay();
+ }
+ /* Data never became ready - return 0xff */
+ return 0xff;
+}
+
+/**
+ * Read resource data.
+ *
+ * @v buf Buffer in which to store data, or NULL
+ * @v bytes Number of bytes to read
+ *
+ * Resource data is read from the current location. If #buf is NULL,
+ * the data is discarded.
+ */
+static void isapnp_peek ( void *buf, size_t len ) {
+ unsigned int i;
+ unsigned int byte;
+
+ for ( i = 0 ; i < len ; i++) {
+ byte = isapnp_peek_byte();
+ if ( buf )
+ * ( ( uint8_t * ) buf + i ) = byte;
+ }
+}
+
+/**
+ * Find a tag within the resource data.
+ *
+ * @v wanted_tag The tag that we're looking for
+ * @v buf Buffer in which to store the tag's contents
+ * @v len Length of buffer
+ * @ret rc Return status code
+ *
+ * Scan through the resource data until we find a particular tag, and
+ * read its contents into a buffer.
+ */
+static int isapnp_find_tag ( unsigned int wanted_tag, void *buf, size_t len ) {
+ unsigned int tag;
+ unsigned int tag_len;
+
+ DBG2 ( "ISAPnP read tag" );
+ do {
+ tag = isapnp_peek_byte();
+ if ( ISAPNP_IS_SMALL_TAG ( tag ) ) {
+ tag_len = ISAPNP_SMALL_TAG_LEN ( tag );
+ tag = ISAPNP_SMALL_TAG_NAME ( tag );
+ } else {
+ tag_len = ( isapnp_peek_byte() +
+ ( isapnp_peek_byte() << 8 ) );
+ tag = ISAPNP_LARGE_TAG_NAME ( tag );
+ }
+ DBG2 ( " %02x (%02x)", tag, tag_len );
+ if ( tag == wanted_tag ) {
+ if ( len > tag_len )
+ len = tag_len;
+ isapnp_peek ( buf, len );
+ DBG2 ( "\n" );
+ return 0;
+ } else {
+ isapnp_peek ( NULL, tag_len );
+ }
+ } while ( tag != ISAPNP_TAG_END );
+ DBG2 ( "\n" );
+ return -ENOENT;
+}
+
+/**
+ * Find specified Logical Device ID tag
+ *
+ * @v logdev Logical device ID
+ * @v logdevid Logical device ID structure to fill in
+ * @ret rc Return status code
+ */
+static int isapnp_find_logdevid ( unsigned int logdev,
+ struct isapnp_logdevid *logdevid ) {
+ unsigned int i;
+ int rc;
+
+ for ( i = 0 ; i <= logdev ; i++ ) {
+ if ( ( rc = isapnp_find_tag ( ISAPNP_TAG_LOGDEVID, logdevid,
+ sizeof ( *logdevid ) ) ) != 0 )
+ return rc;
+ }
+ return 0;
+}
+
+/**
+ * Try isolating ISAPnP cards at the current read port.
+ *
+ * @ret \>0 Number of ISAPnP cards found
+ * @ret 0 There are no ISAPnP cards in the system
+ * @ret \<0 A conflict was detected; try a new read port
+ * @err None -
+ *
+ * The state diagram on page 18 (PDF page 24) of the PnP ISA spec
+ * gives the best overview of what happens here.
+ */
+static int isapnp_try_isolate ( void ) {
+ struct isapnp_identifier identifier;
+ unsigned int i, j;
+ unsigned int seen_55aa, seen_life;
+ unsigned int csn = 0;
+ unsigned int data;
+ unsigned int byte;
+
+ DBG ( "ISAPnP attempting isolation at read port %04x\n",
+ isapnp_read_port );
+
+ /* Place all cards into the Sleep state, whatever state
+ * they're currently in.
+ */
+ isapnp_wait_for_key();
+ isapnp_send_key();
+
+ /* Reset all assigned CSNs */
+ isapnp_reset_csn();
+ isapnp_delay();
+ isapnp_delay();
+
+ /* Place all cards into the Isolation state */
+ isapnp_wait_for_key ();
+ isapnp_send_key();
+ isapnp_wake ( 0x00 );
+
+ /* Set the read port */
+ isapnp_set_read_port();
+ isapnp_delay();
+
+ while ( 1 ) {
+
+ /* All cards that do not have assigned CSNs are
+ * currently in the Isolation state, each time we go
+ * through this loop.
+ */
+
+ /* Initiate serial isolation */
+ isapnp_serialisolation();
+ isapnp_delay();
+
+ /* Read identifier serially via the ISAPnP read port. */
+ memset ( &identifier, 0, sizeof ( identifier ) );
+ seen_55aa = seen_life = 0;
+ for ( i = 0 ; i < 9 ; i++ ) {
+ byte = 0;
+ for ( j = 0 ; j < 8 ; j++ ) {
+ data = isapnp_read_data();
+ isapnp_delay();
+ data = ( ( data << 8 ) | isapnp_read_data() );
+ isapnp_delay();
+ byte >>= 1;
+ if ( data != 0xffff ) {
+ seen_life++;
+ if ( data == 0x55aa ) {
+ byte |= 0x80;
+ seen_55aa++;
+ }
+ }
+ }
+ *( ( ( uint8_t * ) &identifier ) + i ) = byte;
+ }
+
+ /* If we didn't see any 55aa patterns, stop here */
+ if ( ! seen_55aa ) {
+ if ( csn ) {
+ DBG ( "ISAPnP found no more cards\n" );
+ } else {
+ if ( seen_life ) {
+ DBG ( "ISAPnP saw life but no cards, "
+ "trying new read port\n" );
+ csn = -1;
+ } else {
+ DBG ( "ISAPnP saw no signs of life, "
+ "abandoning isolation\n" );
+ }
+ }
+ break;
+ }
+
+ /* If the checksum was invalid stop here */
+ if ( identifier.checksum != isapnp_checksum ( &identifier) ) {
+ DBG ( "ISAPnP found malformed card "
+ ISAPNP_CARD_ID_FMT "\n with checksum %02x "
+ "(should be %02x), trying new read port\n",
+ ISAPNP_CARD_ID_DATA ( &identifier ),
+ identifier.checksum,
+ isapnp_checksum ( &identifier) );
+ csn = -1;
+ break;
+ }
+
+ /* Give the device a CSN */
+ csn++;
+ DBG ( "ISAPnP found card " ISAPNP_CARD_ID_FMT
+ ", assigning CSN %02x\n",
+ ISAPNP_CARD_ID_DATA ( &identifier ), csn );
+
+ isapnp_write_csn ( csn );
+ isapnp_delay();
+
+ /* Send this card back to Sleep and force all cards
+ * without a CSN into Isolation state
+ */
+ isapnp_wake ( 0x00 );
+ isapnp_delay();
+ }
+
+ /* Place all cards in Wait for Key state */
+ isapnp_wait_for_key();
+
+ /* Return number of cards found */
+ if ( csn > 0 ) {
+ DBG ( "ISAPnP found %d cards at read port %04x\n",
+ csn, isapnp_read_port );
+ }
+ return csn;
+}
+
+/**
+ * Find a valid read port and isolate all ISAPnP cards.
+ *
+ */
+static void isapnp_isolate ( void ) {
+ for ( isapnp_read_port = ISAPNP_READ_PORT_START ;
+ isapnp_read_port <= ISAPNP_READ_PORT_MAX ;
+ isapnp_read_port += ISAPNP_READ_PORT_STEP ) {
+ /* Avoid problematic locations such as the NE2000
+ * probe space
+ */
+ if ( ( isapnp_read_port >= 0x280 ) &&
+ ( isapnp_read_port <= 0x380 ) )
+ continue;
+
+ /* If we detect any ISAPnP cards at this location, stop */
+ if ( isapnp_try_isolate() >= 0 )
+ return;
+ }
+}
+
+/**
+ * Activate or deactivate an ISAPnP device.
+ *
+ * @v isapnp ISAPnP device
+ * @v activation True to enable, False to disable the device
+ * @ret None -
+ * @err None -
+ *
+ * This routine simply activates the device in its current
+ * configuration, or deactivates the device. It does not attempt any
+ * kind of resource arbitration.
+ *
+ */
+void isapnp_device_activation ( struct isapnp_device *isapnp,
+ int activation ) {
+ /* Wake the card and select the logical device */
+ isapnp_wait_for_key ();
+ isapnp_send_key ();
+ isapnp_wake ( isapnp->csn );
+ isapnp_logicaldevice ( isapnp->logdev );
+
+ /* Activate/deactivate the logical device */
+ isapnp_activate ( activation );
+ isapnp_delay();
+
+ /* Return all cards to Wait for Key state */
+ isapnp_wait_for_key ();
+
+ DBG ( "ISAPnP %s device %02x:%02x\n",
+ ( activation ? "activated" : "deactivated" ),
+ isapnp->csn, isapnp->logdev );
+}
+
+/**
+ * Probe an ISAPnP device
+ *
+ * @v isapnp ISAPnP device
+ * @ret rc Return status code
+ *
+ * Searches for a driver for the ISAPnP device. If a driver is found,
+ * its probe() routine is called.
+ */
+static int isapnp_probe ( struct isapnp_device *isapnp ) {
+ struct isapnp_driver *driver;
+ struct isapnp_device_id *id;
+ unsigned int i;
+ int rc;
+
+ DBG ( "Adding ISAPnP device %02x:%02x (%04x:%04x (\"%s\") "
+ "io %x irq %d)\n", isapnp->csn, isapnp->logdev,
+ isapnp->vendor_id, isapnp->prod_id,
+ isa_id_string ( isapnp->vendor_id, isapnp->prod_id ),
+ isapnp->ioaddr, isapnp->irqno );
+
+ for_each_table_entry ( driver, ISAPNP_DRIVERS ) {
+ for ( i = 0 ; i < driver->id_count ; i++ ) {
+ id = &driver->ids[i];
+ if ( id->vendor_id != isapnp->vendor_id )
+ continue;
+ if ( ISA_PROD_ID ( id->prod_id ) !=
+ ISA_PROD_ID ( isapnp->prod_id ) )
+ continue;
+ isapnp->driver = driver;
+ isapnp->driver_name = id->name;
+ DBG ( "...using driver %s\n", isapnp->driver_name );
+ if ( ( rc = driver->probe ( isapnp, id ) ) != 0 ) {
+ DBG ( "......probe failed\n" );
+ continue;
+ }
+ return 0;
+ }
+ }
+
+ DBG ( "...no driver found\n" );
+ return -ENOTTY;
+}
+
+/**
+ * Remove an ISAPnP device
+ *
+ * @v isapnp ISAPnP device
+ */
+static void isapnp_remove ( struct isapnp_device *isapnp ) {
+ isapnp->driver->remove ( isapnp );
+ DBG ( "Removed ISAPnP device %02x:%02x\n",
+ isapnp->csn, isapnp->logdev );
+}
+
+/**
+ * Probe ISAPnP root bus
+ *
+ * @v rootdev ISAPnP bus root device
+ *
+ * Scans the ISAPnP bus for devices and registers all devices it can
+ * find.
+ */
+static int isapnpbus_probe ( struct root_device *rootdev ) {
+ struct isapnp_device *isapnp = NULL;
+ struct isapnp_identifier identifier;
+ struct isapnp_logdevid logdevid;
+ unsigned int csn;
+ unsigned int logdev;
+ int rc;
+
+ /* Perform isolation if it hasn't yet been done */
+ if ( ! isapnp_read_port )
+ isapnp_isolate();
+
+ for ( csn = 1 ; csn <= 0xff ; csn++ ) {
+ for ( logdev = 0 ; logdev <= 0xff ; logdev++ ) {
+
+ /* Allocate struct isapnp_device */
+ if ( ! isapnp )
+ isapnp = malloc ( sizeof ( *isapnp ) );
+ if ( ! isapnp ) {
+ rc = -ENOMEM;
+ goto err;
+ }
+ memset ( isapnp, 0, sizeof ( *isapnp ) );
+ isapnp->csn = csn;
+ isapnp->logdev = logdev;
+
+ /* Wake the card */
+ isapnp_wait_for_key();
+ isapnp_send_key();
+ isapnp_wake ( csn );
+
+ /* Read the card identifier */
+ isapnp_peek ( &identifier, sizeof ( identifier ) );
+
+ /* No card with this CSN; stop here */
+ if ( identifier.vendor_id & 0x80 )
+ goto done;
+
+ /* Find the Logical Device ID tag */
+ if ( ( rc = isapnp_find_logdevid ( logdev,
+ &logdevid ) ) != 0){
+ /* No more logical devices; go to next CSN */
+ break;
+ }
+
+ /* Select the logical device */
+ isapnp_logicaldevice ( logdev );
+
+ /* Populate struct isapnp_device */
+ isapnp->vendor_id = logdevid.vendor_id;
+ isapnp->prod_id = logdevid.prod_id;
+ isapnp->ioaddr = isapnp_read_iobase ( 0 );
+ isapnp->irqno = isapnp_read_irqno ( 0 );
+
+ /* Return all cards to Wait for Key state */
+ isapnp_wait_for_key();
+
+ /* Add to device hierarchy */
+ snprintf ( isapnp->dev.name,
+ sizeof ( isapnp->dev.name ),
+ "ISAPnP%02x:%02x", csn, logdev );
+ isapnp->dev.desc.bus_type = BUS_TYPE_ISAPNP;
+ isapnp->dev.desc.vendor = isapnp->vendor_id;
+ isapnp->dev.desc.device = isapnp->prod_id;
+ isapnp->dev.desc.ioaddr = isapnp->ioaddr;
+ isapnp->dev.desc.irq = isapnp->irqno;
+ isapnp->dev.parent = &rootdev->dev;
+ list_add ( &isapnp->dev.siblings,
+ &rootdev->dev.children );
+ INIT_LIST_HEAD ( &isapnp->dev.children );
+
+ /* Look for a driver */
+ if ( isapnp_probe ( isapnp ) == 0 ) {
+ /* isapnpdev registered, we can drop our ref */
+ isapnp = NULL;
+ } else {
+ /* Not registered; re-use struct */
+ list_del ( &isapnp->dev.siblings );
+ }
+ }
+ }
+
+ done:
+ free ( isapnp );
+ return 0;
+
+ err:
+ free ( isapnp );
+ isapnpbus_remove ( rootdev );
+ return rc;
+}
+
+/**
+ * Remove ISAPnP root bus
+ *
+ * @v rootdev ISAPnP bus root device
+ */
+static void isapnpbus_remove ( struct root_device *rootdev ) {
+ struct isapnp_device *isapnp;
+ struct isapnp_device *tmp;
+
+ list_for_each_entry_safe ( isapnp, tmp, &rootdev->dev.children,
+ dev.siblings ) {
+ isapnp_remove ( isapnp );
+ list_del ( &isapnp->dev.siblings );
+ free ( isapnp );
+ }
+}
+
+/** ISAPnP bus root device driver */
+static struct root_driver isapnp_root_driver = {
+ .probe = isapnpbus_probe,
+ .remove = isapnpbus_remove,
+};
+
+/** ISAPnP bus root device */
+struct root_device isapnp_root_device __root_device = {
+ .dev = { .name = "ISAPnP" },
+ .driver = &isapnp_root_driver,
+};
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-05-17 20:52:54 +0200