+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * (C) Copyright 2004 Tundra Semiconductor Corp.
- * Author: Alex Bounine
- *
- * 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
projects / u-boot / blobdiff