mirror of
https://github.com/AsahiLinux/u-boot
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281 lines
7.8 KiB
C
281 lines
7.8 KiB
C
/*
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* (C) Copyright 2004 Tundra Semiconductor Corp.
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* Author: Alex Bounine
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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#include <config.h>
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#include <common.h>
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#include <tsi108.h>
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#if defined(CONFIG_CMD_I2C)
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#define I2C_DELAY 100000
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#undef DEBUG_I2C
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#ifdef DEBUG_I2C
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#define DPRINT(x) printf (x)
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#else
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#define DPRINT(x)
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#endif
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/* All functions assume that Tsi108 I2C block is the only master on the bus */
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/* I2C read helper function */
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static int i2c_read_byte (
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uint i2c_chan, /* I2C channel number: 0 - main, 1 - SDC SPD */
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uchar chip_addr,/* I2C device address on the bus */
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uint byte_addr, /* Byte address within I2C device */
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uchar * buffer /* pointer to data buffer */
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)
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{
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u32 temp;
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u32 to_count = I2C_DELAY;
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u32 op_status = TSI108_I2C_TIMEOUT_ERR;
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u32 chan_offset = TSI108_I2C_OFFSET;
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DPRINT (("I2C read_byte() %d 0x%02x 0x%02x\n",
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i2c_chan, chip_addr, byte_addr));
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if (0 != i2c_chan)
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chan_offset = TSI108_I2C_SDRAM_OFFSET;
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/* Check if I2C operation is in progress */
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temp = *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2);
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if (0 == (temp & (I2C_CNTRL2_RD_STATUS | I2C_CNTRL2_WR_STATUS |
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I2C_CNTRL2_START))) {
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/* Set device address and operation (read = 0) */
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temp = (byte_addr << 16) | ((chip_addr & 0x07) << 8) |
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((chip_addr >> 3) & 0x0F);
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*(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL1) =
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temp;
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/* Issue the read command
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* (at this moment all other parameters are 0
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* (size = 1 byte, lane = 0)
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*/
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*(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2) =
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(I2C_CNTRL2_START);
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/* Wait until operation completed */
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do {
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/* Read I2C operation status */
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temp = *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2);
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if (0 == (temp & (I2C_CNTRL2_RD_STATUS | I2C_CNTRL2_START))) {
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if (0 == (temp &
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(I2C_CNTRL2_I2C_CFGERR |
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I2C_CNTRL2_I2C_TO_ERR))
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) {
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op_status = TSI108_I2C_SUCCESS;
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temp = *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE +
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chan_offset +
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I2C_RD_DATA);
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*buffer = (u8) (temp & 0xFF);
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} else {
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/* report HW error */
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op_status = TSI108_I2C_IF_ERROR;
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DPRINT (("I2C HW error reported: 0x%02x\n", temp));
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}
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break;
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}
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} while (to_count--);
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} else {
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op_status = TSI108_I2C_IF_BUSY;
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DPRINT (("I2C Transaction start failed: 0x%02x\n", temp));
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}
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DPRINT (("I2C read_byte() status: 0x%02x\n", op_status));
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return op_status;
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}
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/*
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* I2C Read interface as defined in "include/i2c.h" :
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* chip_addr: I2C chip address, range 0..127
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* (to read from SPD channel EEPROM use (0xD0 ... 0xD7)
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* NOTE: The bit 7 in the chip_addr serves as a channel select.
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* This hack is for enabling "isdram" command on Tsi108 boards
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* without changes to common code. Used for I2C reads only.
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* byte_addr: Memory or register address within the chip
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* alen: Number of bytes to use for addr (typically 1, 2 for larger
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* memories, 0 for register type devices with only one
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* register)
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* buffer: Pointer to destination buffer for data to be read
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* len: How many bytes to read
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*
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* Returns: 0 on success, not 0 on failure
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*/
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int i2c_read (uchar chip_addr, uint byte_addr, int alen,
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uchar * buffer, int len)
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{
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u32 op_status = TSI108_I2C_PARAM_ERR;
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u32 i2c_if = 0;
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/* Hack to support second (SPD) I2C controller (SPD EEPROM read only).*/
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if (0xD0 == (chip_addr & ~0x07)) {
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i2c_if = 1;
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chip_addr &= 0x7F;
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}
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/* Check for valid I2C address */
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if (chip_addr <= 0x7F && (byte_addr + len) <= (0x01 << (alen * 8))) {
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while (len--) {
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op_status = i2c_read_byte(i2c_if, chip_addr, byte_addr++, buffer++);
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if (TSI108_I2C_SUCCESS != op_status) {
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DPRINT (("I2C read_byte() failed: 0x%02x (%d left)\n", op_status, len));
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break;
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}
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}
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}
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DPRINT (("I2C read() status: 0x%02x\n", op_status));
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return op_status;
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}
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/* I2C write helper function */
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static int i2c_write_byte (uchar chip_addr,/* I2C device address on the bus */
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uint byte_addr, /* Byte address within I2C device */
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uchar * buffer /* pointer to data buffer */
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)
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{
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u32 temp;
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u32 to_count = I2C_DELAY;
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u32 op_status = TSI108_I2C_TIMEOUT_ERR;
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/* Check if I2C operation is in progress */
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temp = *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET + I2C_CNTRL2);
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if (0 == (temp & (I2C_CNTRL2_RD_STATUS | I2C_CNTRL2_WR_STATUS | I2C_CNTRL2_START))) {
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/* Place data into the I2C Tx Register */
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*(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
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I2C_TX_DATA) = (u32) * buffer;
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/* Set device address and operation */
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temp =
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I2C_CNTRL1_I2CWRITE | (byte_addr << 16) |
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((chip_addr & 0x07) << 8) | ((chip_addr >> 3) & 0x0F);
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*(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
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I2C_CNTRL1) = temp;
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/* Issue the write command (at this moment all other parameters
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* are 0 (size = 1 byte, lane = 0)
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*/
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*(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
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I2C_CNTRL2) = (I2C_CNTRL2_START);
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op_status = TSI108_I2C_TIMEOUT_ERR;
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/* Wait until operation completed */
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do {
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/* Read I2C operation status */
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temp = *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET + I2C_CNTRL2);
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if (0 == (temp & (I2C_CNTRL2_WR_STATUS | I2C_CNTRL2_START))) {
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if (0 == (temp &
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(I2C_CNTRL2_I2C_CFGERR |
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I2C_CNTRL2_I2C_TO_ERR))) {
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op_status = TSI108_I2C_SUCCESS;
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} else {
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/* report detected HW error */
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op_status = TSI108_I2C_IF_ERROR;
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DPRINT (("I2C HW error reported: 0x%02x\n", temp));
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}
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break;
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}
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} while (to_count--);
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} else {
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op_status = TSI108_I2C_IF_BUSY;
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DPRINT (("I2C Transaction start failed: 0x%02x\n", temp));
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}
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return op_status;
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}
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/*
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* I2C Write interface as defined in "include/i2c.h" :
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* chip_addr: I2C chip address, range 0..127
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* byte_addr: Memory or register address within the chip
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* alen: Number of bytes to use for addr (typically 1, 2 for larger
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* memories, 0 for register type devices with only one
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* register)
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* buffer: Pointer to data to be written
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* len: How many bytes to write
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*
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* Returns: 0 on success, not 0 on failure
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*/
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int i2c_write (uchar chip_addr, uint byte_addr, int alen, uchar * buffer,
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int len)
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{
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u32 op_status = TSI108_I2C_PARAM_ERR;
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/* Check for valid I2C address */
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if (chip_addr <= 0x7F && (byte_addr + len) <= (0x01 << (alen * 8))) {
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while (len--) {
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op_status =
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i2c_write_byte (chip_addr, byte_addr++, buffer++);
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if (TSI108_I2C_SUCCESS != op_status) {
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DPRINT (("I2C write_byte() failed: 0x%02x (%d left)\n", op_status, len));
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break;
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}
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}
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}
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return op_status;
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}
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/*
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* I2C interface function as defined in "include/i2c.h".
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* Probe the given I2C chip address by reading single byte from offset 0.
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* Returns 0 if a chip responded, not 0 on failure.
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*/
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int i2c_probe (uchar chip)
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{
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u32 tmp;
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/*
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* Try to read the first location of the chip.
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* The Tsi108 HW doesn't support sending just the chip address
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* and checkong for an <ACK> back.
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*/
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return i2c_read (chip, 0, 1, (uchar *)&tmp, 1);
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}
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#endif
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