1 files changed, 0 insertions, 393 deletions
diff --git a/gpxe/src/drivers/bitbash/i2c_bit.c b/gpxe/src/drivers/bitbash/i2c_bit.c
deleted file mode 100644
index 13197270..00000000
--- a/gpxe/src/drivers/bitbash/i2c_bit.c
+++ /dev/null
@@ -1,393 +0,0 @@
-/*
- * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-FILE_LICENCE ( GPL2_OR_LATER );
-
-#include <stddef.h>
-#include <stdint.h>
-#include <errno.h>
-#include <string.h>
-#include <assert.h>
-#include <unistd.h>
-#include <gpxe/bitbash.h>
-#include <gpxe/i2c.h>
-
-/** @file
- *
- * I2C bit-bashing interface
- *
- * This implements a simple I2C master via a bit-bashing interface
- * that provides two lines: SCL (clock) and SDA (data).
- */
-
-/**
- * Delay between output state changes
- *
- * Max rated i2c speed (for the basic i2c protocol) is 100kbps,
- * i.e. 200k clock transitions per second.
- */
-static void i2c_delay ( void ) {
-	udelay ( I2C_UDELAY );
-}
-
-/**
- * Set state of I2C SCL line
- *
- * @v basher		Bit-bashing interface
- * @v state		New state of SCL
- */
-static void setscl ( struct bit_basher *basher, int state ) {
-	DBG2 ( "%c", ( state ? '/' : '\\' ) );
-	write_bit ( basher, I2C_BIT_SCL, state );
-	i2c_delay();
-}
-
-/**
- * Set state of I2C SDA line
- *
- * @v basher		Bit-bashing interface
- * @v state		New state of SDA
- */
-static void setsda ( struct bit_basher *basher, int state ) {
-	DBG2 ( "%c", ( state ? '1' : '0' ) );
-	write_bit ( basher, I2C_BIT_SDA, state );
-	i2c_delay();
-}
-
-/**
- * Get state of I2C SDA line
- *
- * @v basher		Bit-bashing interface
- * @ret state		State of SDA
- */
-static int getsda ( struct bit_basher *basher ) {
-	int state;
-	state = read_bit ( basher, I2C_BIT_SDA );
-	DBG2 ( "%c", ( state ? '+' : '-' ) );
-	return state;
-}
-
-/**
- * Send an I2C start condition
- *
- * @v basher		Bit-bashing interface
- */
-static void i2c_start ( struct bit_basher *basher ) {
-	setscl ( basher, 1 );
-	setsda ( basher, 0 );
-	setscl ( basher, 0 );
-	setsda ( basher, 1 );
-}
-
-/**
- * Send an I2C data bit
- *
- * @v basher		Bit-bashing interface
- * @v bit		Bit to send
- */
-static void i2c_send_bit ( struct bit_basher *basher, int bit ) {
-	setsda ( basher, bit );
-	setscl ( basher, 1 );
-	setscl ( basher, 0 );
-	setsda ( basher, 1 );
-}
-
-/**
- * Receive an I2C data bit
- *
- * @v basher		Bit-bashing interface
- * @ret bit		Received bit
- */
-static int i2c_recv_bit ( struct bit_basher *basher ) {
-	int bit;
-
-	setscl ( basher, 1 );
-	bit = getsda ( basher );
-	setscl ( basher, 0 );
-	return bit;
-}
-
-/**
- * Send an I2C stop condition
- *
- * @v basher		Bit-bashing interface
- */
-static void i2c_stop ( struct bit_basher *basher ) {
-	setsda ( basher, 0 );
-	setscl ( basher, 1 );
-	setsda ( basher, 1 );
-}
-
-/**
- * Send byte via I2C bus and check for acknowledgement
- *
- * @v basher		Bit-bashing interface
- * @v byte		Byte to send
- * @ret rc		Return status code
- *
- * Sends a byte via the I2C bus and checks for an acknowledgement from
- * the slave device.
- */
-static int i2c_send_byte ( struct bit_basher *basher, uint8_t byte ) {
-	int i;
-	int ack;
-
-	/* Send byte */
-	DBG2 ( "[send %02x]", byte );
-	for ( i = 8 ; i ; i-- ) {
-		i2c_send_bit ( basher, byte & 0x80 );
-		byte <<= 1;
-	}
-
-	/* Check for acknowledgement from slave */
-	ack = ( i2c_recv_bit ( basher ) == 0 );
-	DBG2 ( "%s", ( ack ? "[acked]" : "[not acked]" ) );
-
-	return ( ack ? 0 : -EIO );
-}
-
-/**
- * Receive byte via I2C bus
- *
- * @v basher		Bit-bashing interface
- * @ret byte		Received byte
- *
- * Receives a byte via the I2C bus and sends NACK to the slave device.
- */
-static uint8_t i2c_recv_byte ( struct bit_basher *basher ) {
-	uint8_t byte = 0;
-	int i;
-
-	/* Receive byte */
-	for ( i = 8 ; i ; i-- ) {
-		byte <<= 1;
-		byte |= ( i2c_recv_bit ( basher ) & 0x1 );
-	}
-
-	/* Send NACK */
-	i2c_send_bit ( basher, 1 );
-
-	DBG2 ( "[rcvd %02x]", byte );
-	return byte;
-}
-
-/**
- * Select I2C device for reading or writing
- *
- * @v basher		Bit-bashing interface
- * @v i2cdev		I2C device
- * @v offset		Starting offset within the device
- * @v direction		I2C_READ or I2C_WRITE
- * @ret rc		Return status code
- */
-static int i2c_select ( struct bit_basher *basher, struct i2c_device *i2cdev,
-			unsigned int offset, unsigned int direction ) {
-	unsigned int address;
-	int shift;
-	unsigned int byte;
-	int rc;
-
-	i2c_start ( basher );
-
-	/* Calculate address to appear on bus */
-	address = ( ( ( i2cdev->dev_addr |
-			( offset >> ( 8 * i2cdev->word_addr_len ) ) ) << 1 )
-		    | direction );
-
-	/* Send address a byte at a time */
-	for ( shift = ( 8 * ( i2cdev->dev_addr_len - 1 ) ) ;
-	      shift >= 0 ; shift -= 8 ) {
-		byte = ( ( address >> shift ) & 0xff );
-		if ( ( rc = i2c_send_byte ( basher, byte ) ) != 0 )
-			return rc;
-	}
-
-	return 0;
-}
-
-/**
- * Reset I2C bus
- *
- * @v basher		Bit-bashing interface
- * @ret rc		Return status code
- *
- * i2c devices often don't have a reset line, so even a reboot or
- * system power cycle is sometimes not enough to bring them back to a
- * known state.
- */
-static int i2c_reset ( struct bit_basher *basher ) {
-	unsigned int i;
-	int sda;
-
-	/* Clock through several cycles, waiting for an opportunity to
-	 * pull SDA low while SCL is high (which creates a start
-	 * condition).
-	 */
-	setscl ( basher, 0 );
-	setsda ( basher, 1 );
-	for ( i = 0 ; i < I2C_RESET_MAX_CYCLES ; i++ ) {
-		setscl ( basher, 1 );
-		sda = getsda ( basher );
-		if ( sda ) {
-			/* Now that the device will see a start, issue it */
-			i2c_start ( basher );
-			/* Stop the bus to leave it in a known good state */
-			i2c_stop ( basher );
-			DBGC ( basher, "I2CBIT %p reset after %d attempts\n",
-			       basher, ( i + 1 ) );
-			return 0;
-		}
-		setscl ( basher, 0 );
-	}
-
-	DBGC ( basher, "I2CBIT %p could not reset after %d attempts\n",
-	       basher, i );
-	return -ETIMEDOUT;
-}
-
-/**
- * Read data from I2C device via bit-bashing interface
- *
- * @v i2c		I2C interface
- * @v i2cdev		I2C device
- * @v offset		Starting offset within the device
- * @v data		Data buffer
- * @v len		Length of data buffer
- * @ret rc		Return status code
- *
- * Note that attempting to read zero bytes of data is a valid way to
- * check for I2C device presence.
- */
-static int i2c_bit_read ( struct i2c_interface *i2c,
-			  struct i2c_device *i2cdev, unsigned int offset,
-			  uint8_t *data, unsigned int len ) {
-	struct i2c_bit_basher *i2cbit
-		= container_of ( i2c, struct i2c_bit_basher, i2c );
-	struct bit_basher *basher = &i2cbit->basher;
-	int rc = 0;
-
-	DBGC ( basher, "I2CBIT %p reading from device %x: ",
-	       basher, i2cdev->dev_addr );
-
-	for ( ; ; data++, offset++ ) {
-
-		/* Select device for writing */
-		if ( ( rc = i2c_select ( basher, i2cdev, offset,
-					 I2C_WRITE ) ) != 0 )
-			break;
-
-		/* Abort at end of data */
-		if ( ! ( len-- ) )
-			break;
-
-		/* Select offset */
-		if ( ( rc = i2c_send_byte ( basher, offset ) ) != 0 )
-			break;
-		
-		/* Select device for reading */
-		if ( ( rc = i2c_select ( basher, i2cdev, offset,
-					 I2C_READ ) ) != 0 )
-			break;
-
-		/* Read byte */
-		*data = i2c_recv_byte ( basher );
-		DBGC ( basher, "%02x ", *data );
-	}
-	
-	DBGC ( basher, "%s\n", ( rc ? "failed" : "" ) );
-	i2c_stop ( basher );
-	return rc;
-}
-
-/**
- * Write data to I2C device via bit-bashing interface
- *
- * @v i2c		I2C interface
- * @v i2cdev		I2C device
- * @v offset		Starting offset within the device
- * @v data		Data buffer
- * @v len		Length of data buffer
- * @ret rc		Return status code
- *
- * Note that attempting to write zero bytes of data is a valid way to
- * check for I2C device presence.
- */
-static int i2c_bit_write ( struct i2c_interface *i2c,
-			   struct i2c_device *i2cdev, unsigned int offset,
-			   const uint8_t *data, unsigned int len ) {
-	struct i2c_bit_basher *i2cbit
-		= container_of ( i2c, struct i2c_bit_basher, i2c );
-	struct bit_basher *basher = &i2cbit->basher;
-	int rc = 0;
-
-	DBGC ( basher, "I2CBIT %p writing to device %x: ",
-	       basher, i2cdev->dev_addr );
-
-	for ( ; ; data++, offset++ ) {
-
-		/* Select device for writing */
-		if ( ( rc = i2c_select ( basher, i2cdev, offset,
-					 I2C_WRITE ) ) != 0 )
-			break;
-		
-		/* Abort at end of data */
-		if ( ! ( len-- ) )
-			break;
-
-		/* Select offset */
-		if ( ( rc = i2c_send_byte ( basher, offset ) ) != 0 )
-			break;
-		
-		/* Write data to device */
-		DBGC ( basher, "%02x ", *data );
-		if ( ( rc = i2c_send_byte ( basher, *data ) ) != 0 )
-			break;
-	}
-	
-	DBGC ( basher, "%s\n", ( rc ? "failed" : "" ) );
-	i2c_stop ( basher );
-	return rc;
-}
-
-/**
- * Initialise I2C bit-bashing interface
- *
- * @v i2cbit		I2C bit-bashing interface
- * @v bash_op		Bit-basher operations
- */
-int init_i2c_bit_basher ( struct i2c_bit_basher *i2cbit,
-			  struct bit_basher_operations *bash_op ) {
-	struct bit_basher *basher = &i2cbit->basher;
-	int rc;
-
-	/* Initialise data structures */
-	basher->op = bash_op;
-	assert ( basher->op->read != NULL );
-	assert ( basher->op->write != NULL );
-	i2cbit->i2c.read = i2c_bit_read;
-	i2cbit->i2c.write = i2c_bit_write;
-
-	/* Reset I2C bus */
-	if ( ( rc = i2c_reset ( basher ) ) != 0 ) {
-		DBGC ( basher, "I2CBIT %p could not reset I2C bus: %s\n",
-		       basher, strerror ( rc ) );
-		return rc;
-	}
-
-	return 0;
-}