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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>
- *
- ***************************************************************************/
-
- #include "etherboot.h"
- #include "timer.h"
- #include "isapnp.h"
-
- /*
- * We can have 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.
- *
- * However, we shouldn't make scanning the ISAPnP bus an INIT_FN(),
- * because even ISAPnP probing can still screw up other devices on the
- * ISA bus. We therefore probe only when we are first asked to find
- * an ISAPnP device.
- *
- */
- static uint16_t isapnp_read_port;
- static uint16_t isapnp_max_csn;
-
- static const char initdata[] = INITDATA;
-
- /*
- * ISAPnP utility functions
- *
- */
-
- static inline void isapnp_write_address ( uint8_t address ) {
- outb ( address, ISAPNP_ADDRESS );
- }
-
- static inline void isapnp_write_data ( uint8_t data ) {
- outb ( data, ISAPNP_WRITE_DATA );
- }
-
- static inline void isapnp_write_byte ( uint8_t address, uint8_t value ) {
- isapnp_write_address ( address );
- isapnp_write_data ( value );
- }
-
- static inline uint8_t isapnp_read_data ( void ) {
- return inb ( isapnp_read_port );
- }
-
- static inline void isapnp_set_read_port ( void ) {
- isapnp_write_byte ( ISAPNP_READPORT, isapnp_read_port >> 2 );
- }
-
- static inline void isapnp_serialisolation ( void ) {
- isapnp_write_address ( ISAPNP_SERIALISOLATION );
- }
-
- static inline void isapnp_wait_for_key ( void ) {
- isapnp_write_byte ( ISAPNP_CONFIGCONTROL, ISAPNP_CONFIG_WAIT_FOR_KEY );
- }
-
- static inline void isapnp_reset_csn ( void ) {
- isapnp_write_byte ( ISAPNP_CONFIGCONTROL, ISAPNP_CONFIG_RESET_CSN );
- }
-
- static inline void isapnp_wake ( uint8_t csn ) {
- isapnp_write_byte ( ISAPNP_WAKE, csn );
- }
-
- static inline void isapnp_write_csn ( uint8_t csn ) {
- isapnp_write_byte ( ISAPNP_CARDSELECTNUMBER, csn );
- }
-
- /*
- * 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. :)
- *
- */
- static inline uint8_t isapnp_lfsr_next ( uint8_t lfsr, 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
- *
- */
- static void isapnp_send_key ( void ) {
- unsigned int i;
- uint8_t lfsr;
-
- udelay ( 1000 );
- 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
- *
- */
- static uint8_t isapnp_checksum ( union isapnp_identifier *identifier ) {
- int i, j;
- uint8_t lfsr;
- uint8_t byte;
-
- lfsr = ISAPNP_LFSR_SEED;
- for ( i = 0 ; i < 8 ; i++ ) {
- byte = identifier->bytes[i];
- for ( j = 0 ; j < 8 ; j++ ) {
- lfsr = isapnp_lfsr_next ( lfsr, byte );
- byte >>= 1;
- }
- }
- return lfsr;
- }
-
- /*
- * Try isolating ISAPnP cards at the current read port. Return the
- * number of ISAPnP cards found.
- *
- * 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 ) {
- union isapnp_identifier identifier;
- int i, j, seen55aa;
- uint16_t data;
- uint8_t byte;
-
- DBG ( "ISAPnP attempting isolation at read port %hx\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_max_csn = 0;
- udelay ( 2000 );
-
- /* 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 ();
- udelay ( 1000 );
-
- 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 ();
- udelay ( 1000 );
-
- /* Read identifier serially via the ISAPnP read port. */
- memset ( &identifier, 0, sizeof ( identifier ) );
- seen55aa = 0;
- for ( i = 0 ; i < 9 ; i++ ) {
- byte = 0;
- for ( j = 0 ; j < 8 ; j++ ) {
- data = isapnp_read_data ();
- udelay ( 1000 );
- data = ( data << 8 ) | isapnp_read_data ();
- udelay ( 1000 );
- if ( data == 0x55aa ) {
- byte |= 1;
- }
- byte <<= 1;
- }
- identifier.bytes[i] = byte;
- if ( byte ) {
- seen55aa = 1;
- }
- }
-
- /* If we didn't see a valid ISAPnP device, stop here */
- if ( ( ! seen55aa ) ||
- ( identifier.checksum != isapnp_checksum (&identifier) ) )
- break;
-
- /* Give the device a CSN */
- isapnp_max_csn++;
- DBG ( "ISAPnP isolation found device "
- "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx:%hhx:%hhx "
- "(checksum %hhx), assigning CSN %hhx\n",
- identifier.bytes[0], identifier.bytes[1],
- identifier.bytes[2], identifier.bytes[3],
- identifier.bytes[4], identifier.bytes[5],
- identifier.bytes[6], identifier.bytes[7],
- identifier.checksum, isapnp_max_csn );
-
- isapnp_write_csn ( isapnp_max_csn );
- udelay ( 1000 );
-
- /* Send this card back to Sleep and force all cards
- * without a CSN into Isolation state
- */
- isapnp_wake ( 0x00 );
- udelay ( 1000 );
- }
-
- /* Place all cards in Wait for Key state */
- isapnp_wait_for_key ();
-
- /* Return number of cards found */
- DBG ( "ISAPnP found %d devices at read port %hx\n", isapnp_read_port );
- return isapnp_max_csn;
- }
-
- /*
- * Isolate all ISAPnP cards, locating a valid read port in the process.
- *
- */
- static void isapnp_isolate ( void ) {
- for ( isapnp_read_port = ISAPNP_READ_PORT_MIN ;
- 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 () )
- return;
- }
- }
-
-
-
-
-
-
- /*
- * Build device list for all present ISA PnP devices.
- */
- static int isapnp_build_device_list(void)
- {
- int csn, device, vendor, serial;
- unsigned char header[9], checksum;
- for (csn = 1; csn <= 10; csn++) {
- Wake(csn);
- isapnp_peek(header, 9);
- checksum = isapnp_checksum(header);
- #ifdef EDEBUG
- printf
- ("vendor: 0x%hX:0x%hX:0x%hX:0x%hX:0x%hX:0x%hX:0x%hX:0x%hX:0x%hX\n",
- header[0], header[1], header[2], header[3], header[4],
- header[5], header[6], header[7], header[8]);
- printf("checksum = 0xhX\n", checksum);
- #endif
- /* Don't be strict on the checksum, here !
- e.g. 'SCM SwapBox Plug and Play' has header[8]==0 (should be: b7) */
- if (header[8] == 0);
- else if (checksum == 0x00 || checksum != header[8]) /* not valid CSN */
- continue;
-
- vendor = (header[1] << 8) | header[0];
- device = (header[3] << 8) | header[2];
- serial =
- (header[7] << 24) | (header[6] << 16) | (header[5] <<
- 8) |
- header[4];
- if (vendor == 0x6D50)
- if (device == 0x5150) {
- printf
- ("\nFound 3Com 3c515 PNP Card!\n Vendor ID: 0x%hX, Device ID: 0x%hX, Serial Num: 0x%hX\n",
- vendor, device, serial);
- pnp_card_csn = csn;
- }
- isapnp_checksum_value = 0x00;
- }
- return 0;
- }
-
- int Config(int csn)
- {
- #define TIMEOUT_PNP 100
- unsigned char id[IDENT_LEN];
- int i, x;
- Wake(csn);
- udelay(1000);
- for (i = 0; i < IDENT_LEN; i++) {
- for (x = 1; x < TIMEOUT_PNP; x++) {
- if (STATUS & 1)
- break;
- udelay(1000);
- }
- id[i] = RESOURCEDATA;
- #ifdef EDEBUG
- printf(" 0x%hX ", id[i]);
- #endif
- }
- #ifdef EDEBUG
- printf("Got The status bit\n");
- #endif
- /*Set Logical Device Register active */
- LOGICALDEVICENUMBER;
- /* Specify the first logical device */
- WRITE_DATA(0);
-
-
- /* Apparently just activating the card is enough
- for Etherboot to detect it. Why bother with the
- following code. Left in place in case it is
- later required */
- /*==========================================*/
- /* set DMA */
- /* ADDRESS(0x74 + 0);
- WRITE_DATA(7); */
-
- /*Set IRQ */
- /* udelay(1000);
- ADDRESS(0x70 + (0 << 1));
- WRITE_DATA(9);
- udelay(1000); */
- /*=============================================*/
- /*Activate */
- ACTIVATE;
- WRITE_DATA(1);
- udelay(250);
- /* Ask for access to the Wait for Key command - ConfigControl register */
- CONFIGCONTROL;
- /* Write the Wait for Key Command to the ConfigControl Register */
- WRITE_DATA(CONFIG_WAIT_FOR_KEY);
- /* As per doc. Two Write cycles of 0x00 required befor the Initialization key is sent */
- ADDRESS(0);
- ADDRESS(0);
-
- return 1;
- }
-
-
- static void isapnp_peek(unsigned char *data, int bytes)
- {
- int i, j;
- unsigned char d = 0;
-
- for (i = 1; i <= bytes; i++) {
- for (j = 0; j < 20; j++) {
- d = STATUS;
- if (d & 1)
- break;
- udelay(100);
- }
- if (!(d & 1)) {
- if (data != NULL)
- *data++ = 0xff;
- continue;
- }
- d = RESOURCEDATA; /* PRESDI */
- isapnp_checksum_value += d;
- if (data != NULL)
- *data++ = d;
- }
- }
-
-
-
-
- /*
- * Ensure that there is sufficient space in the shared dev_bus
- * structure for a struct isapnp_device.
- *
- */
- DEV_BUS( struct isapnp_device, isapnp_dev );
- static char isapnp_magic[0]; /* guaranteed unique symbol */
-
- /*
- * Fill in parameters for an ISAPnP device based on CSN
- *
- * Return 1 if device present, 0 otherwise
- *
- */
- static int fill_isapnp_device ( struct isapnp_device *isapnp ) {
-
- /*
- * Ensure that all ISAPnP cards have CSNs allocated to them,
- * if we haven't already done so.
- *
- */
- if ( ! isapnp_read_port ) {
- isapnp_isolate();
- }
-
- /* wake csn, read config, send card to sleep */
-
- DBG ( "ISAPnP found CSN %hhx ID %hx:%hx (\"%s\")\n",
- isapnp->csn, isapnp->vendor_id, isapnp->prod_id,
- isa_id_string ( isapnp->vendor_id, isapnp->prod_id ) );
-
- return 0;
- }
-
- /*
- * Find an ISAPnP device matching the specified driver
- *
- */
- int find_isapnp_device ( struct isapnp_device *isapnp,
- struct isapnp_driver *driver ) {
- unsigned int i;
-
- /* Initialise struct isapnp if it's the first time it's been used. */
- if ( isapnp->magic != isapnp_magic ) {
- memset ( isapnp, 0, sizeof ( *isapnp ) );
- isapnp->magic = isapnp_magic;
- isapnp->csn = 1;
- }
-
- /* Iterate through all possible ISAPNP CSNs, starting where we
- * left off.
- */
- for ( ; isapnp->csn <= isapnp_max_csn ; isapnp->csn++ ) {
- /* If we've already used this device, skip it */
- if ( isapnp->already_tried ) {
- isapnp->already_tried = 0;
- continue;
- }
-
- /* Fill in device parameters */
- if ( ! fill_isapnp_device ( isapnp ) ) {
- continue;
- }
-
- /* Compare against driver's ID list */
- for ( i = 0 ; i < driver->id_count ; i++ ) {
- struct isapnp_id *id = &driver->ids[i];
-
- if ( ( isapnp->vendor_id == id->vendor_id ) &&
- ( ISA_PROD_ID ( isapnp->prod_id ) ==
- ISA_PROD_ID ( id->prod_id ) ) ) {
- DBG ( "Device %s (driver %s) matches ID %s\n",
- id->name, driver->name,
- isa_id_string ( isapnp->vendor_id,
- isapnp->prod_id ) );
- isapnp->name = id->name;
- isapnp->already_tried = 1;
- return 1;
- }
- }
- }
-
- /* No device found */
- isapnp->csn = 1;
- return 0;
- }
-
- /*
- * Find the next ISAPNP device that can be used to boot using the
- * specified driver.
- *
- */
- int find_isapnp_boot_device ( struct dev *dev, struct isapnp_driver *driver ) {
- struct isapnp_device *isapnp = ( struct isapnp_device * ) dev->bus;
-
- if ( ! find_isapnp_device ( isapnp, driver ) )
- return 0;
-
- dev->name = isapnp->name;
- dev->devid.bus_type = ISA_BUS_TYPE;
- dev->devid.vendor_id = isapnp->vendor_id;
- dev->devid.device_id = isapnp->prod_id;
-
- return 1;
- }
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