nxp: i2c driver support.
NXP I2C driver support for NXP SoC(s). Signed-off-by: York Sun <york.sun@nxp.com> Signed-off-by: Pankaj Gupta <pankaj.gupta@nxp.com> Change-Id: I234b76f9fa1b30dd13aa087001411370cc6c8dd0
This commit is contained in:
Pankaj Gupta
parent
d8e9799921
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c6d9fdbc78
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/*
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* Copyright 2016-2020 NXP
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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*/
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#include <errno.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <common/debug.h>
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#include <drivers/delay_timer.h>
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#include "i2c.h"
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#include <nxp_timer.h>
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static uintptr_t g_nxp_i2c_addr;
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void i2c_init(uintptr_t nxp_i2c_addr)
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{
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struct ls_i2c *ccsr_i2c = (void *)nxp_i2c_addr;
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g_nxp_i2c_addr = nxp_i2c_addr;
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/* Presume workaround for erratum a009203 applied */
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i2c_out(&ccsr_i2c->cr, I2C_CR_DIS);
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i2c_out(&ccsr_i2c->fd, I2C_FD_CONSERV);
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i2c_out(&ccsr_i2c->sr, I2C_SR_RST);
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i2c_out(&ccsr_i2c->cr, I2C_CR_EN);
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}
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static int wait_for_state(struct ls_i2c *ccsr_i2c,
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unsigned char state, unsigned char mask)
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{
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unsigned char sr;
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uint64_t start_time = get_timer_val(0);
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uint64_t timer;
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do {
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sr = i2c_in(&ccsr_i2c->sr);
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if (sr & I2C_SR_AL) {
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i2c_out(&ccsr_i2c->sr, sr);
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WARN("I2C arbitration lost\n");
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return -EIO;
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}
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if ((sr & mask) == state) {
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return (int)sr;
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}
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timer = get_timer_val(start_time);
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if (timer > I2C_TIMEOUT)
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break;
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mdelay(1);
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} while (1);
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WARN("I2C: Timeout waiting for state 0x%x, sr = 0x%x\n", state, sr);
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return -ETIMEDOUT;
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}
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static int tx_byte(struct ls_i2c *ccsr_i2c, unsigned char c)
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{
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int ret;
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i2c_out(&ccsr_i2c->sr, I2C_SR_IF);
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i2c_out(&ccsr_i2c->dr, c);
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ret = wait_for_state(ccsr_i2c, I2C_SR_IF, I2C_SR_IF);
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if (ret < 0) {
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WARN("%s: state error\n", __func__);
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return ret;
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}
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if (ret & I2C_SR_RX_NAK) {
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WARN("%s: nodev\n", __func__);
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return -ENODEV;
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}
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return 0;
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}
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static int gen_stop(struct ls_i2c *ccsr_i2c)
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{
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unsigned char cr;
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int ret;
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cr = i2c_in(&ccsr_i2c->cr);
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cr &= ~(I2C_CR_MA | I2C_CR_TX);
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i2c_out(&ccsr_i2c->cr, cr);
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ret = wait_for_state(ccsr_i2c, I2C_SR_IDLE, I2C_SR_BB);
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if (ret < 0) {
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WARN("I2C: Generating stop failed.\n");
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}
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return ret;
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}
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static int i2c_write_addr(struct ls_i2c *ccsr_i2c, unsigned char chip,
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int addr, int alen)
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{
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int ret;
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unsigned char cr;
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if (alen != 1) {
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WARN("I2C: Unsupported address len [%d]\n", alen);
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return -EIO;
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}
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if (i2c_in(&ccsr_i2c->ad) == (chip << 1)) {
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WARN("I2C: slave address same as self\n");
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return -ENODEV;
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}
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i2c_out(&ccsr_i2c->sr, I2C_SR_IF);
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ret = wait_for_state(ccsr_i2c, I2C_SR_IDLE, I2C_SR_BB);
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if (ret < 0) {
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return ret;
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}
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cr = i2c_in(&ccsr_i2c->cr);
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cr |= I2C_CR_MA;
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i2c_out(&ccsr_i2c->cr, cr);
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ret = wait_for_state(ccsr_i2c, I2C_SR_BB, I2C_SR_BB);
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if (ret < 0) {
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return ret;
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}
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VERBOSE("Before writing chip %d\n", chip);
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cr |= I2C_CR_TX | I2C_CR_TX_NAK;
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i2c_out(&ccsr_i2c->cr, cr);
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ret = tx_byte(ccsr_i2c, chip << 1);
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if (ret < 0) {
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gen_stop(ccsr_i2c);
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return ret;
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}
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VERBOSE("Before writing addr\n");
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while (alen--) {
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ret = tx_byte(ccsr_i2c, (addr >> (alen << 3)) & 0xff);
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if (ret < 0) {
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gen_stop(ccsr_i2c);
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return ret;
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}
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}
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return 0;
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}
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static int read_data(struct ls_i2c *ccsr_i2c, unsigned char chip,
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unsigned char *buf, int len)
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{
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int i;
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int ret;
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unsigned char cr;
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cr = i2c_in(&ccsr_i2c->cr);
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cr &= ~(I2C_CR_TX | I2C_CR_TX_NAK);
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if (len == 1) {
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cr |= I2C_CR_TX_NAK;
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}
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i2c_out(&ccsr_i2c->cr, cr);
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i2c_out(&ccsr_i2c->sr, I2C_SR_IF);
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i2c_in(&ccsr_i2c->dr); /* dummy read */
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for (i = 0; i < len; i++) {
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ret = wait_for_state(ccsr_i2c, I2C_SR_IF, I2C_SR_IF);
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if (ret < 0) {
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gen_stop(ccsr_i2c);
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return ret;
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}
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if (i == (len - 1)) {
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gen_stop(ccsr_i2c);
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} else if (i == (len - 2)) {
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/* Updating the command to send
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* No ACK.
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*/
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cr = i2c_in(&ccsr_i2c->cr);
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cr |= I2C_CR_TX_NAK;
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i2c_out(&ccsr_i2c->cr, cr);
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}
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i2c_out(&ccsr_i2c->sr, I2C_SR_IF);
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buf[i] = i2c_in(&ccsr_i2c->dr);
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}
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return 0;
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}
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static int write_data(struct ls_i2c *ccsr_i2c, unsigned char chip,
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const unsigned char *buf, int len)
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{
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int i;
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int ret;
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for (i = 0; i < len; i++) {
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ret = tx_byte(ccsr_i2c, buf[i]);
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if (ret < 0) {
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break;
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}
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}
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ret = gen_stop(ccsr_i2c);
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return ret;
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}
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int i2c_read(unsigned char chip, int addr, int alen,
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unsigned char *buf, int len)
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{
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int ret;
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unsigned char cr;
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struct ls_i2c *ccsr_i2c = (void *)g_nxp_i2c_addr;
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ret = i2c_write_addr(ccsr_i2c, chip, addr, alen);
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if (ret < 0) {
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gen_stop(ccsr_i2c);
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return ret;
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}
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cr = i2c_in(&ccsr_i2c->cr);
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cr |= I2C_CR_RSTA;
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i2c_out(&ccsr_i2c->cr, cr);
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ret = tx_byte(ccsr_i2c, (chip << 1) | 1);
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if (ret < 0) {
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gen_stop(ccsr_i2c);
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return ret;
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}
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return read_data(ccsr_i2c, chip, buf, len);
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}
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int i2c_write(unsigned char chip, int addr, int alen,
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const unsigned char *buf, int len)
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{
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int ret;
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struct ls_i2c *ccsr_i2c = (void *)g_nxp_i2c_addr;
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ret = i2c_write_addr(ccsr_i2c, chip, addr, alen);
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if (ret < 0) {
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return ret;
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}
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return write_data(ccsr_i2c, chip, buf, len);
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}
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int i2c_probe_chip(unsigned char chip)
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{
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int ret;
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struct ls_i2c *ccsr_i2c = (void *)g_nxp_i2c_addr;
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ret = i2c_write_addr(ccsr_i2c, chip, 0, 0);
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if (ret < 0) {
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WARN("write addr failed\n");
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return ret;
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}
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ret = gen_stop(ccsr_i2c);
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if (ret < 0) {
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WARN("I2C: Probe not complete.\n");
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}
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return ret;
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}
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@ -0,0 +1,52 @@
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/*
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* Copyright 2016-2020 NXP
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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*/
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#ifndef I2C_H
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#define I2C_H
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#include <lib/mmio.h>
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#define I2C_TIMEOUT 1000 /* ms */
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#define I2C_FD_CONSERV 0x7e
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#define I2C_CR_DIS (1 << 7)
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#define I2C_CR_EN (0 << 7)
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#define I2C_CR_MA (1 << 5)
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#define I2C_CR_TX (1 << 4)
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#define I2C_CR_TX_NAK (1 << 3)
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#define I2C_CR_RSTA (1 << 2)
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#define I2C_SR_BB (1 << 5)
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#define I2C_SR_IDLE (0 << 5)
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#define I2C_SR_AL (1 << 4)
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#define I2C_SR_IF (1 << 1)
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#define I2C_SR_RX_NAK (1 << 0)
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#define I2C_SR_RST (I2C_SR_AL | I2C_SR_IF)
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#define I2C_GLITCH_EN 0x8
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#define i2c_in(a) mmio_read_8((uintptr_t)(a))
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#define i2c_out(a, v) mmio_write_8((uintptr_t)(a), (v))
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struct ls_i2c {
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unsigned char ad; /* I2c Bus Address Register */
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unsigned char fd; /* I2c Bus Frequency Dividor Register */
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unsigned char cr; /* I2c Bus Control Register */
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unsigned char sr; /* I2c Bus Status Register */
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unsigned char dr; /* I2C Bus Data I/O Register */
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unsigned char ic; /* I2C Bus Interrupt Config Register */
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unsigned char dbg; /* I2C Bus Debug Register */
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};
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void i2c_init(uintptr_t nxp_i2c_addr);
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int i2c_read(unsigned char chip, int addr, int alen,
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unsigned char *buf, int len);
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int i2c_write(unsigned char chip, int addr, int alen,
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const unsigned char *buf, int len);
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int i2c_probe_chip(unsigned char chip);
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#endif /* I2C_H */
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@ -0,0 +1,25 @@
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#
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# Copyright 2020 NXP
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#
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# SPDX-License-Identifier: BSD-3-Clause
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#
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ifeq (${ADD_I2C},)
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ADD_I2C := 1
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I2C_DRIVERS_PATH := ${PLAT_DRIVERS_PATH}/i2c
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I2C_SOURCES += $(I2C_DRIVERS_PATH)/i2c.c
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PLAT_INCLUDES += -I$(I2C_DRIVERS_PATH)
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ifeq (${BL_COMM_I2C_NEEDED},yes)
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BL_COMMON_SOURCES += ${I2C_SOURCES}
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else
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ifeq (${BL2_I2C_NEEDED},yes)
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BL2_SOURCES += ${I2C_SOURCES}
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endif
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ifeq (${BL31_I2C_NEEDED},yes)
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BL31_SOURCES += ${I2C_SOURCES}
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endif
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endif
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endif
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