GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
commit b1928b41c0
21813 changed files with 4413081 additions and 0 deletions
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+/*
+ * Copyright 2016-2020 NXP
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <common/debug.h>
+#include <drivers/delay_timer.h>
+#include "i2c.h"
+#include <nxp_timer.h>
+
+static uintptr_t g_nxp_i2c_addr;
+
+void i2c_init(uintptr_t nxp_i2c_addr)
+{
+	struct ls_i2c *ccsr_i2c = (void *)nxp_i2c_addr;
+
+	g_nxp_i2c_addr = nxp_i2c_addr;
+	/* Presume workaround for erratum a009203 applied */
+	i2c_out(&ccsr_i2c->cr, I2C_CR_DIS);
+	i2c_out(&ccsr_i2c->fd, I2C_FD_CONSERV);
+	i2c_out(&ccsr_i2c->sr, I2C_SR_RST);
+	i2c_out(&ccsr_i2c->cr, I2C_CR_EN);
+}
+
+static int wait_for_state(struct ls_i2c *ccsr_i2c,
+			  unsigned char state, unsigned char mask)
+{
+	unsigned char sr;
+	uint64_t start_time = get_timer_val(0);
+	uint64_t timer;
+
+	do {
+		sr = i2c_in(&ccsr_i2c->sr);
+		if (sr & I2C_SR_AL) {
+			i2c_out(&ccsr_i2c->sr, sr);
+			WARN("I2C arbitration lost\n");
+			return -EIO;
+		}
+		if ((sr & mask) == state) {
+			return (int)sr;
+		}
+
+		timer = get_timer_val(start_time);
+		if (timer > I2C_TIMEOUT)
+			break;
+		mdelay(1);
+	} while (1);
+	WARN("I2C: Timeout waiting for state 0x%x, sr = 0x%x\n", state, sr);
+
+	return -ETIMEDOUT;
+}
+
+static int tx_byte(struct ls_i2c *ccsr_i2c, unsigned char c)
+{
+	int ret;
+
+	i2c_out(&ccsr_i2c->sr, I2C_SR_IF);
+	i2c_out(&ccsr_i2c->dr, c);
+	ret = wait_for_state(ccsr_i2c, I2C_SR_IF, I2C_SR_IF);
+	if (ret < 0) {
+		WARN("%s: state error\n", __func__);
+		return ret;
+	}
+	if (ret & I2C_SR_RX_NAK) {
+		WARN("%s: nodev\n", __func__);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int gen_stop(struct ls_i2c *ccsr_i2c)
+{
+	unsigned char cr;
+	int ret;
+
+	cr = i2c_in(&ccsr_i2c->cr);
+	cr &= ~(I2C_CR_MA | I2C_CR_TX);
+	i2c_out(&ccsr_i2c->cr, cr);
+	ret = wait_for_state(ccsr_i2c, I2C_SR_IDLE, I2C_SR_BB);
+	if (ret < 0) {
+		WARN("I2C: Generating stop failed.\n");
+	}
+	return ret;
+}
+
+static int i2c_write_addr(struct ls_i2c *ccsr_i2c, unsigned char chip,
+			  int addr, int alen)
+{
+	int ret;
+	unsigned char cr;
+
+	if (alen != 1) {
+		WARN("I2C: Unsupported address len [%d]\n", alen);
+		return -EIO;
+	}
+
+	if (i2c_in(&ccsr_i2c->ad) == (chip << 1)) {
+		WARN("I2C: slave address same as self\n");
+		return -ENODEV;
+	}
+	i2c_out(&ccsr_i2c->sr, I2C_SR_IF);
+	ret = wait_for_state(ccsr_i2c, I2C_SR_IDLE, I2C_SR_BB);
+	if (ret < 0) {
+		return ret;
+	}
+
+	cr = i2c_in(&ccsr_i2c->cr);
+	cr |= I2C_CR_MA;
+	i2c_out(&ccsr_i2c->cr, cr);
+	ret = wait_for_state(ccsr_i2c, I2C_SR_BB, I2C_SR_BB);
+	if (ret < 0) {
+		return ret;
+	}
+
+	VERBOSE("Before writing chip %d\n", chip);
+	cr |= I2C_CR_TX | I2C_CR_TX_NAK;
+	i2c_out(&ccsr_i2c->cr, cr);
+	ret = tx_byte(ccsr_i2c, chip << 1);
+	if (ret < 0) {
+		gen_stop(ccsr_i2c);
+		return ret;
+	}
+
+	VERBOSE("Before writing addr\n");
+	while (alen--) {
+		ret = tx_byte(ccsr_i2c, (addr >> (alen << 3)) & 0xff);
+		if (ret < 0) {
+			gen_stop(ccsr_i2c);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int read_data(struct ls_i2c *ccsr_i2c, unsigned char chip,
+		     unsigned char *buf, int len)
+{
+	int i;
+	int ret;
+	unsigned char cr;
+
+	cr = i2c_in(&ccsr_i2c->cr);
+	cr &= ~(I2C_CR_TX | I2C_CR_TX_NAK);
+	if (len == 1) {
+		cr |= I2C_CR_TX_NAK;
+	}
+	i2c_out(&ccsr_i2c->cr, cr);
+	i2c_out(&ccsr_i2c->sr, I2C_SR_IF);
+	i2c_in(&ccsr_i2c->dr);	/* dummy read */
+	for (i = 0; i < len; i++) {
+		ret = wait_for_state(ccsr_i2c, I2C_SR_IF, I2C_SR_IF);
+		if (ret < 0) {
+			gen_stop(ccsr_i2c);
+			return ret;
+		}
+		if (i == (len - 1)) {
+			gen_stop(ccsr_i2c);
+		} else if (i == (len - 2)) {
+			/* Updating the command to send
+			 * No ACK.
+			 */
+			cr = i2c_in(&ccsr_i2c->cr);
+			cr |= I2C_CR_TX_NAK;
+			i2c_out(&ccsr_i2c->cr, cr);
+		}
+		i2c_out(&ccsr_i2c->sr, I2C_SR_IF);
+		buf[i] = i2c_in(&ccsr_i2c->dr);
+	}
+
+	return 0;
+}
+
+static int write_data(struct ls_i2c *ccsr_i2c, unsigned char chip,
+		      const unsigned char *buf, int len)
+{
+	int i;
+	int ret;
+
+	for (i = 0; i < len; i++) {
+		ret = tx_byte(ccsr_i2c, buf[i]);
+		if (ret < 0) {
+			break;
+		}
+	}
+	ret = gen_stop(ccsr_i2c);
+
+	return ret;
+}
+
+
+int i2c_read(unsigned char chip, int addr, int alen,
+	     unsigned char *buf, int len)
+{
+	int ret;
+	unsigned char cr;
+	struct ls_i2c *ccsr_i2c = (void *)g_nxp_i2c_addr;
+
+	ret = i2c_write_addr(ccsr_i2c, chip, addr, alen);
+	if (ret < 0) {
+		gen_stop(ccsr_i2c);
+		return ret;
+	}
+
+	cr = i2c_in(&ccsr_i2c->cr);
+	cr |= I2C_CR_RSTA;
+	i2c_out(&ccsr_i2c->cr, cr);
+
+	ret = tx_byte(ccsr_i2c, (chip << 1) | 1);
+	if (ret < 0) {
+		gen_stop(ccsr_i2c);
+		return ret;
+	}
+
+	return read_data(ccsr_i2c, chip, buf, len);
+}
+
+int i2c_write(unsigned char chip, int addr, int alen,
+	      const unsigned char *buf, int len)
+{
+	int ret;
+	struct ls_i2c *ccsr_i2c = (void *)g_nxp_i2c_addr;
+
+	ret = i2c_write_addr(ccsr_i2c, chip, addr, alen);
+	if (ret < 0) {
+		return ret;
+	}
+
+	return write_data(ccsr_i2c, chip, buf, len);
+}
+
+int i2c_probe_chip(unsigned char chip)
+{
+	int ret;
+	struct ls_i2c *ccsr_i2c = (void *)g_nxp_i2c_addr;
+
+	ret = i2c_write_addr(ccsr_i2c, chip, 0, 0);
+	if (ret < 0) {
+		WARN("write addr failed\n");
+		return ret;
+	}
+
+	ret = gen_stop(ccsr_i2c);
+	if (ret < 0) {
+		WARN("I2C: Probe not complete.\n");
+	}
+
+	return ret;
+}