src/soc/qualcomm/ipq40xx/i2c.c

/* SPDX-License-Identifier: BSD-3-Clause */

#include <console/console.h>
#include <device/i2c_simple.h>
#include <string.h>
#include <soc/blsp.h>
#include <soc/qup.h>
#include <soc/gpio.h>

static qup_config_t blsp1_qup0_config = {
	QUP_MINICORE_I2C_MASTER,
	100000,
	19050000,
	QUP_MODE_BLOCK,
	0
};

static qup_config_t blsp1_qup1_config = {
	QUP_MINICORE_I2C_MASTER,
	100000,
	19050000,
	QUP_MODE_BLOCK,
	0
};

static qup_config_t blsp1_qup2_config = {
	QUP_MINICORE_I2C_MASTER,
	100000,
	19050000,
	QUP_MODE_BLOCK,
	0
};

static qup_config_t blsp1_qup3_config = {
	QUP_MINICORE_I2C_MASTER,
	100000,
	19050000,
	QUP_MODE_BLOCK,
	0
};

static int i2c_read(uint32_t gsbi_id, uint8_t slave,
		    uint8_t *data, int data_len)
{
	qup_data_t obj;
	qup_return_t qup_ret = 0;

	memset(&obj, 0, sizeof(obj));
	obj.protocol = QUP_MINICORE_I2C_MASTER;
	obj.p.iic.addr = slave;
	obj.p.iic.data_len = data_len;
	obj.p.iic.data = data;
	qup_ret = qup_recv_data(gsbi_id, &obj);

	if (QUP_SUCCESS != qup_ret)
		return 1;
	else
		return 0;
}

static int i2c_write(uint32_t gsbi_id, uint8_t slave,
		     uint8_t *data, int data_len, uint8_t stop_seq)
{
	qup_data_t obj;
	qup_return_t qup_ret = 0;

	memset(&obj, 0, sizeof(obj));
	obj.protocol = QUP_MINICORE_I2C_MASTER;
	obj.p.iic.addr = slave;
	obj.p.iic.data_len = data_len;
	obj.p.iic.data = data;
	qup_ret = qup_send_data(gsbi_id, &obj, stop_seq);

	if (QUP_SUCCESS != qup_ret)
		return 1;
	else
		return 0;
}

static int i2c_init(blsp_qup_id_t id)
{
	qup_config_t *qup_config;

	switch (id) {
	case BLSP_QUP_ID_0:
		qup_config = &blsp1_qup0_config;
		break;
	case BLSP_QUP_ID_1:
		qup_config = &blsp1_qup1_config;
		break;
	case BLSP_QUP_ID_2:
		qup_config = &blsp1_qup2_config;
		break;
	case BLSP_QUP_ID_3:
		qup_config = &blsp1_qup3_config;
		break;
	default:
		printk(BIOS_ERR, "QUP configuration not defined for BLSP%d.\n",
		       id);
		return 1;
	}

	if (qup_config->initialized)
		return 0;

	if (blsp_i2c_init(id)) {
		printk(BIOS_ERR, "failed to initialize blsp\n");
		return 1;
	}

	if (qup_init(id, qup_config)) {
		printk(BIOS_ERR, "failed to initialize qup\n");
		return 1;
	}

	if (qup_reset_i2c_master_status(id)) {
		printk(BIOS_ERR, "failed to reset i2c master status\n");
		return 1;
	}

	qup_config->initialized = 1;
	return 0;
}

int platform_i2c_transfer(unsigned int bus, struct i2c_msg *segments,
			  int seg_count)
{
	struct i2c_msg *seg = segments;
	int ret = 0;

	if (i2c_init(bus))
		return 1;

	while (!ret && seg_count--) {
		if (seg->flags & I2C_M_RD)
			ret = i2c_read(bus, seg->slave, seg->buf, seg->len);
		else
			ret = i2c_write(bus, seg->slave, seg->buf, seg->len,
					(seg_count ? 0 : 1));
		seg++;
	}

	if (ret) {
		qup_set_state(bus, QUP_STATE_RESET);
		return 1;
	}

	return 0;
}