drivers/i2c/tsi108_i2c.c - uboot-imx - Git at Google

 /*
  * (C) Copyright 2004 Tundra Semiconductor Corp.
  * Author: Alex Bounine
  *
  * SPDX-License-Identifier:	GPL-2.0+
  *
  * NOTE: This driver should be converted to driver model before June 2017.
  * Please see doc/driver-model/i2c-howto.txt for instructions.
  */

 #include <config.h>
 #include <common.h>

 #include <tsi108.h>

 #if defined(CONFIG_CMD_I2C)

 #define I2C_DELAY	100000
 #undef  DEBUG_I2C

 #ifdef DEBUG_I2C
 #define DPRINT(x) printf (x)
 #else
 #define DPRINT(x)
 #endif

 /* All functions assume that Tsi108 I2C block is the only master on the bus */
 /* I2C read helper function */

 void i2c_init(int speed, int slaveaddr)
 {
 	/*
 	 * The TSI108 has a fixed I2C clock rate and doesn't support slave
 	 * operation.  This function only exists as a stub to fit into the
 	 * U-Boot I2C API.
 	 */
 }

 static int i2c_read_byte (
 		uint i2c_chan,	/* I2C channel number: 0 - main, 1 - SDC SPD */
 		uchar chip_addr,/* I2C device address on the bus */
 		uint byte_addr,	/* Byte address within I2C device */
 		uchar * buffer	/* pointer to data buffer */
 		)
 {
 	u32 temp;
 	u32 to_count = I2C_DELAY;
 	u32 op_status = TSI108_I2C_TIMEOUT_ERR;
 	u32 chan_offset = TSI108_I2C_OFFSET;

 	DPRINT (("I2C read_byte() %d 0x%02x 0x%02x\n",
 		i2c_chan, chip_addr, byte_addr));

 	if (0 != i2c_chan)
 		chan_offset = TSI108_I2C_SDRAM_OFFSET;

 	/* Check if I2C operation is in progress */
 	temp = *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2);

 	if (0 == (temp & (I2C_CNTRL2_RD_STATUS | I2C_CNTRL2_WR_STATUS |
 			  I2C_CNTRL2_START))) {
 		/* Set device address and operation (read = 0) */
 		temp = (byte_addr << 16) | ((chip_addr & 0x07) << 8) |
 		    ((chip_addr >> 3) & 0x0F);
 		*(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL1) =
 		    temp;

 		/* Issue the read command
 		 * (at this moment all other parameters are 0
 		 * (size = 1 byte, lane = 0)
 		 */

 		*(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2) =
 		    (I2C_CNTRL2_START);

 		/* Wait until operation completed */
 		do {
 			/* Read I2C operation status */
 			temp = *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2);

 			if (0 == (temp & (I2C_CNTRL2_RD_STATUS | I2C_CNTRL2_START))) {
 				if (0 == (temp &
 				     (I2C_CNTRL2_I2C_CFGERR |
 				      I2C_CNTRL2_I2C_TO_ERR))
 				    ) {
 					op_status = TSI108_I2C_SUCCESS;

 					temp = *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE +
 							 chan_offset +
 							 I2C_RD_DATA);

 					*buffer = (u8) (temp & 0xFF);
 				} else {
 					/* report HW error */
 					op_status = TSI108_I2C_IF_ERROR;

 					DPRINT (("I2C HW error reported: 0x%02x\n", temp));
 				}

 				break;
 			}
 		} while (to_count--);
 	} else {
 		op_status = TSI108_I2C_IF_BUSY;

 		DPRINT (("I2C Transaction start failed: 0x%02x\n", temp));
 	}

 	DPRINT (("I2C read_byte() status: 0x%02x\n", op_status));
 	return op_status;
 }

 /*
  * I2C Read interface as defined in "include/i2c.h" :
  *   chip_addr: I2C chip address, range 0..127
  *                  (to read from SPD channel EEPROM use (0xD0 ... 0xD7)
  *              NOTE: The bit 7 in the chip_addr serves as a channel select.
  *              This hack is for enabling "i2c sdram" command on Tsi108 boards
  *              without changes to common code. Used for I2C reads only.
  *   byte_addr: Memory or register address within the chip
  *   alen:      Number of bytes to use for addr (typically 1, 2 for larger
  *              memories, 0 for register type devices with only one
  *              register)
  *   buffer:    Pointer to destination buffer for data to be read
  *   len:       How many bytes to read
  *
  *   Returns: 0 on success, not 0 on failure
  */

 int i2c_read (uchar chip_addr, uint byte_addr, int alen,
 		uchar * buffer, int len)
 {
 	u32 op_status = TSI108_I2C_PARAM_ERR;
 	u32 i2c_if = 0;

 	/* Hack to support second (SPD) I2C controller (SPD EEPROM read only).*/
 	if (0xD0 == (chip_addr & ~0x07)) {
 		i2c_if = 1;
 		chip_addr &= 0x7F;
 	}
 	/* Check for valid I2C address */
 	if (chip_addr <= 0x7F && (byte_addr + len) <= (0x01 << (alen * 8))) {
 		while (len--) {
 			op_status = i2c_read_byte(i2c_if, chip_addr, byte_addr++, buffer++);

 			if (TSI108_I2C_SUCCESS != op_status) {
 				DPRINT (("I2C read_byte() failed: 0x%02x (%d left)\n", op_status, len));

 				break;
 			}
 		}
 	}

 	DPRINT (("I2C read() status: 0x%02x\n", op_status));
 	return op_status;
 }

 /* I2C write helper function */

 static int i2c_write_byte (uchar chip_addr,/* I2C device address on the bus */
 			  uint byte_addr, /* Byte address within I2C device */
 			  uchar * buffer  /*  pointer to data buffer */
 			  )
 {
 	u32 temp;
 	u32 to_count = I2C_DELAY;
 	u32 op_status = TSI108_I2C_TIMEOUT_ERR;

 	/* Check if I2C operation is in progress */
 	temp = *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET + I2C_CNTRL2);

 	if (0 == (temp & (I2C_CNTRL2_RD_STATUS | I2C_CNTRL2_WR_STATUS | I2C_CNTRL2_START))) {
 		/* Place data into the I2C Tx Register */
 		*(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
 			  I2C_TX_DATA) = (u32) * buffer;

 		/* Set device address and operation  */
 		temp =
 		    I2C_CNTRL1_I2CWRITE | (byte_addr << 16) |
 		    ((chip_addr & 0x07) << 8) | ((chip_addr >> 3) & 0x0F);
 		*(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
 			  I2C_CNTRL1) = temp;

 		/* Issue the write command (at this moment all other parameters
 		 * are 0 (size = 1 byte, lane = 0)
 		 */

 		*(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
 			  I2C_CNTRL2) = (I2C_CNTRL2_START);

 		op_status = TSI108_I2C_TIMEOUT_ERR;

 		/* Wait until operation completed */
 		do {
 			/* Read I2C operation status */
 			temp = *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET + I2C_CNTRL2);

 			if (0 == (temp & (I2C_CNTRL2_WR_STATUS | I2C_CNTRL2_START))) {
 				if (0 == (temp &
 				     (I2C_CNTRL2_I2C_CFGERR |
 				      I2C_CNTRL2_I2C_TO_ERR))) {
 					op_status = TSI108_I2C_SUCCESS;
 				} else {
 					/* report detected HW error */
 					op_status = TSI108_I2C_IF_ERROR;

 					DPRINT (("I2C HW error reported: 0x%02x\n", temp));
 				}

 				break;
 			}

 		} while (to_count--);
 	} else {
 		op_status = TSI108_I2C_IF_BUSY;

 		DPRINT (("I2C Transaction start failed: 0x%02x\n", temp));
 	}

 	return op_status;
 }

 /*
  * I2C Write interface as defined in "include/i2c.h" :
  *   chip_addr: I2C chip address, range 0..127
  *   byte_addr: Memory or register address within the chip
  *   alen:      Number of bytes to use for addr (typically 1, 2 for larger
  *              memories, 0 for register type devices with only one
  *              register)
  *   buffer:    Pointer to data to be written
  *   len:       How many bytes to write
  *
  *   Returns: 0 on success, not 0 on failure
  */

 int i2c_write (uchar chip_addr, uint byte_addr, int alen, uchar * buffer,
 	      int len)
 {
 	u32 op_status = TSI108_I2C_PARAM_ERR;

 	/* Check for valid I2C address */
 	if (chip_addr <= 0x7F && (byte_addr + len) <= (0x01 << (alen * 8))) {
 		while (len--) {
 			op_status =
 			    i2c_write_byte (chip_addr, byte_addr++, buffer++);

 			if (TSI108_I2C_SUCCESS != op_status) {
 				DPRINT (("I2C write_byte() failed: 0x%02x (%d left)\n", op_status, len));

 				break;
 			}
 		}
 	}

 	return op_status;
 }

 /*
  * I2C interface function as defined in "include/i2c.h".
  * Probe the given I2C chip address by reading single byte from offset 0.
  * Returns 0 if a chip responded, not 0 on failure.
  */

 int i2c_probe (uchar chip)
 {
 	u32 tmp;

 	/*
 	 * Try to read the first location of the chip.
 	 * The Tsi108 HW doesn't support sending just the chip address
 	 * and checkong for an <ACK> back.
 	 */
 	return i2c_read (chip, 0, 1, (uchar *)&tmp, 1);
 }

 #endif
	/*
	* (C) Copyright 2004 Tundra Semiconductor Corp.
	* Author: Alex Bounine
	*
	* SPDX-License-Identifier: GPL-2.0+
	*
	* NOTE: This driver should be converted to driver model before June 2017.
	* Please see doc/driver-model/i2c-howto.txt for instructions.
	*/

	#include <config.h>
	#include <common.h>

	#include <tsi108.h>

	#if defined(CONFIG_CMD_I2C)

	#define I2C_DELAY 100000
	#undef DEBUG_I2C

	#ifdef DEBUG_I2C
	#define DPRINT(x) printf (x)
	#else
	#define DPRINT(x)
	#endif

	/* All functions assume that Tsi108 I2C block is the only master on the bus */
	/* I2C read helper function */

	void i2c_init(int speed, int slaveaddr)
	{
	/*
	* The TSI108 has a fixed I2C clock rate and doesn't support slave
	* operation. This function only exists as a stub to fit into the
	* U-Boot I2C API.
	*/
	}

	static int i2c_read_byte (
	uint i2c_chan, /* I2C channel number: 0 - main, 1 - SDC SPD */
	uchar chip_addr,/* I2C device address on the bus */
	uint byte_addr, /* Byte address within I2C device */
	uchar * buffer /* pointer to data buffer */
	)
	{
	u32 temp;
	u32 to_count = I2C_DELAY;
	u32 op_status = TSI108_I2C_TIMEOUT_ERR;
	u32 chan_offset = TSI108_I2C_OFFSET;

	DPRINT (("I2C read_byte() %d 0x%02x 0x%02x\n",
	i2c_chan, chip_addr, byte_addr));

	if (0 != i2c_chan)
	chan_offset = TSI108_I2C_SDRAM_OFFSET;

	/* Check if I2C operation is in progress */
	temp = (u32 ) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2);

	if (0 == (temp & (I2C_CNTRL2_RD_STATUS \| I2C_CNTRL2_WR_STATUS \|
	I2C_CNTRL2_START))) {
	/* Set device address and operation (read = 0) */
	temp = (byte_addr << 16) \| ((chip_addr & 0x07) << 8) \|
	((chip_addr >> 3) & 0x0F);
	(u32 ) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL1) =
	temp;

	/* Issue the read command
	* (at this moment all other parameters are 0
	* (size = 1 byte, lane = 0)
	*/

	(u32 ) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2) =
	(I2C_CNTRL2_START);

	/* Wait until operation completed */
	do {
	/* Read I2C operation status */
	temp = (u32 ) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2);

	if (0 == (temp & (I2C_CNTRL2_RD_STATUS \| I2C_CNTRL2_START))) {
	if (0 == (temp &
	(I2C_CNTRL2_I2C_CFGERR \|
	I2C_CNTRL2_I2C_TO_ERR))
	) {
	op_status = TSI108_I2C_SUCCESS;

	temp = (u32 ) (CONFIG_SYS_TSI108_CSR_BASE +
	chan_offset +
	I2C_RD_DATA);

	*buffer = (u8) (temp & 0xFF);
	} else {
	/* report HW error */
	op_status = TSI108_I2C_IF_ERROR;

	DPRINT (("I2C HW error reported: 0x%02x\n", temp));
	}

	break;
	}
	} while (to_count--);
	} else {
	op_status = TSI108_I2C_IF_BUSY;

	DPRINT (("I2C Transaction start failed: 0x%02x\n", temp));
	}

	DPRINT (("I2C read_byte() status: 0x%02x\n", op_status));
	return op_status;
	}

	/*
	* I2C Read interface as defined in "include/i2c.h" :
	* chip_addr: I2C chip address, range 0..127
	* (to read from SPD channel EEPROM use (0xD0 ... 0xD7)
	* NOTE: The bit 7 in the chip_addr serves as a channel select.
	* This hack is for enabling "i2c sdram" command on Tsi108 boards
	* without changes to common code. Used for I2C reads only.
	* byte_addr: Memory or register address within the chip
	* alen: Number of bytes to use for addr (typically 1, 2 for larger
	* memories, 0 for register type devices with only one
	* register)
	* buffer: Pointer to destination buffer for data to be read
	* len: How many bytes to read
	*
	* Returns: 0 on success, not 0 on failure
	*/

	int i2c_read (uchar chip_addr, uint byte_addr, int alen,
	uchar * buffer, int len)
	{
	u32 op_status = TSI108_I2C_PARAM_ERR;
	u32 i2c_if = 0;

	/* Hack to support second (SPD) I2C controller (SPD EEPROM read only).*/
	if (0xD0 == (chip_addr & ~0x07)) {
	i2c_if = 1;
	chip_addr &= 0x7F;
	}
	/* Check for valid I2C address */
	if (chip_addr <= 0x7F && (byte_addr + len) <= (0x01 << (alen * 8))) {
	while (len--) {
	op_status = i2c_read_byte(i2c_if, chip_addr, byte_addr++, buffer++);

	if (TSI108_I2C_SUCCESS != op_status) {
	DPRINT (("I2C read_byte() failed: 0x%02x (%d left)\n", op_status, len));

	break;
	}
	}
	}

	DPRINT (("I2C read() status: 0x%02x\n", op_status));
	return op_status;
	}

	/* I2C write helper function */

	static int i2c_write_byte (uchar chip_addr,/* I2C device address on the bus */
	uint byte_addr, /* Byte address within I2C device */
	uchar * buffer /* pointer to data buffer */
	)
	{
	u32 temp;
	u32 to_count = I2C_DELAY;
	u32 op_status = TSI108_I2C_TIMEOUT_ERR;

	/* Check if I2C operation is in progress */
	temp = (u32 ) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET + I2C_CNTRL2);

	if (0 == (temp & (I2C_CNTRL2_RD_STATUS \| I2C_CNTRL2_WR_STATUS \| I2C_CNTRL2_START))) {
	/* Place data into the I2C Tx Register */
	(u32 ) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
	I2C_TX_DATA) = (u32) * buffer;

	/* Set device address and operation */
	temp =
	I2C_CNTRL1_I2CWRITE \| (byte_addr << 16) \|
	((chip_addr & 0x07) << 8) \| ((chip_addr >> 3) & 0x0F);
	(u32 ) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
	I2C_CNTRL1) = temp;

	/* Issue the write command (at this moment all other parameters
	* are 0 (size = 1 byte, lane = 0)
	*/

	(u32 ) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
	I2C_CNTRL2) = (I2C_CNTRL2_START);

	op_status = TSI108_I2C_TIMEOUT_ERR;

	/* Wait until operation completed */
	do {
	/* Read I2C operation status */
	temp = (u32 ) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET + I2C_CNTRL2);

	if (0 == (temp & (I2C_CNTRL2_WR_STATUS \| I2C_CNTRL2_START))) {
	if (0 == (temp &
	(I2C_CNTRL2_I2C_CFGERR \|
	I2C_CNTRL2_I2C_TO_ERR))) {
	op_status = TSI108_I2C_SUCCESS;
	} else {
	/* report detected HW error */
	op_status = TSI108_I2C_IF_ERROR;

	DPRINT (("I2C HW error reported: 0x%02x\n", temp));
	}

	break;
	}

	} while (to_count--);
	} else {
	op_status = TSI108_I2C_IF_BUSY;

	DPRINT (("I2C Transaction start failed: 0x%02x\n", temp));
	}

	return op_status;
	}

	/*
	* I2C Write interface as defined in "include/i2c.h" :
	* chip_addr: I2C chip address, range 0..127
	* byte_addr: Memory or register address within the chip
	* alen: Number of bytes to use for addr (typically 1, 2 for larger
	* memories, 0 for register type devices with only one
	* register)
	* buffer: Pointer to data to be written
	* len: How many bytes to write
	*
	* Returns: 0 on success, not 0 on failure
	*/

	int i2c_write (uchar chip_addr, uint byte_addr, int alen, uchar * buffer,
	int len)
	{
	u32 op_status = TSI108_I2C_PARAM_ERR;

	/* Check for valid I2C address */
	if (chip_addr <= 0x7F && (byte_addr + len) <= (0x01 << (alen * 8))) {
	while (len--) {
	op_status =
	i2c_write_byte (chip_addr, byte_addr++, buffer++);

	if (TSI108_I2C_SUCCESS != op_status) {
	DPRINT (("I2C write_byte() failed: 0x%02x (%d left)\n", op_status, len));

	break;
	}
	}
	}

	return op_status;
	}

	/*
	* I2C interface function as defined in "include/i2c.h".
	* Probe the given I2C chip address by reading single byte from offset 0.
	* Returns 0 if a chip responded, not 0 on failure.
	*/

	int i2c_probe (uchar chip)
	{
	u32 tmp;

	/*
	* Try to read the first location of the chip.
	* The Tsi108 HW doesn't support sending just the chip address
	* and checkong for an <ACK> back.
	*/
	return i2c_read (chip, 0, 1, (uchar *)&tmp, 1);
	}

	#endif