qcom: Add i2c driver

Add i2c driver in coreboot.

Change-Id: I3d39d0325718fc5dd60da42eb2b87dcc4429bfc2
Signed-off-by: Prudhvi Yarlagadda <pyarlaga@codeaurora.org>
Signed-off-by: Nitheesh Sekar <nsekar@codeaurora.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32546
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

4 files changed, 867 insertions, 0 deletions

diff --git a/src/soc/qualcomm/qcs405/Makefile.inc b/src/soc/qualcomm/qcs405/Makefile.inc
index c64e5bcf58..0ebfcaef78 100644
--- a/src/soc/qualcomm/qcs405/Makefile.inc
+++ b/src/soc/qualcomm/qcs405/Makefile.inc
@@ -8,6 +8,9 @@ bootblock-y += spi.c
 bootblock-y += mmu.c
 bootblock-y += gpio.c
 bootblock-y += clock.c
+bootblock-y += i2c.c
+bootblock-y += qup.c
+bootblock-y += blsp.c
 bootblock-$(CONFIG_DRIVERS_UART) += uart.c
 
 ################################################################################
@@ -15,6 +18,9 @@ verstage-y += timer.c
 verstage-y += spi.c
 verstage-y += gpio.c
 verstage-y += clock.c
+verstage-y += i2c.c
+verstage-y += qup.c
+verstage-y += blsp.c
 verstage-$(CONFIG_DRIVERS_UART) += uart.c
 
 ################################################################################
@@ -25,6 +31,9 @@ romstage-y += gpio.c
 romstage-y += clock.c
 romstage-y += usb.c
 romstage-$(CONFIG_DRIVERS_UART) += uart.c
+romstage-y += i2c.c
+romstage-y += qup.c
+romstage-y += blsp.c
 
 ################################################################################
 ramstage-y += soc.c
@@ -33,6 +42,9 @@ ramstage-y += spi.c
 ramstage-y += cbmem.c
 ramstage-y += gpio.c
 ramstage-y += clock.c
+ramstage-y += i2c.c
+ramstage-y += qup.c
+ramstage-y += blsp.c
 ramstage-y += usb.c
 ramstage-$(CONFIG_DRIVERS_UART) += uart.c
 
diff --git a/src/soc/qualcomm/qcs405/blsp.c b/src/soc/qualcomm/qcs405/blsp.c
new file mode 100644
index 0000000000..f185ea388a
--- /dev/null
+++ b/src/soc/qualcomm/qcs405/blsp.c
@@ -0,0 +1,65 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 - 2016, 2019 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <device/mmio.h>
+#include <soc/blsp.h>
+#include <soc/gpio.h>
+#include <soc/iomap.h>
+#include <soc/clock.h>
+
+blsp_return_t blsp_i2c_init(blsp_qup_id_t id)
+{
+	void *base;
+
+	switch (id) {
+	case BLSP_QUP_ID_1:
+		gpio_configure
+			(GPIO(24), 2, GPIO_PULL_UP, GPIO_2MA, GPIO_OUTPUT);
+		gpio_configure
+			(GPIO(25), 2, GPIO_PULL_UP, GPIO_2MA, GPIO_OUTPUT);
+		break;
+	default:
+		return BLSP_ID_ERROR;
+	}
+
+	clock_configure_i2c(19200000);
+	clock_enable_i2c();
+
+	base = blsp_qup_base(id);
+
+	if (!base)
+		return BLSP_ID_ERROR;
+
+	/* Configure Mini core to I2C core */
+	clrsetbits_le32(base, BLSP_MINI_CORE_MASK, BLSP_MINI_CORE_I2C);
+
+	return BLSP_SUCCESS;
+}
diff --git a/src/soc/qualcomm/qcs405/i2c.c b/src/soc/qualcomm/qcs405/i2c.c
new file mode 100644
index 0000000000..94f8e0d4bb
--- /dev/null
+++ b/src/soc/qualcomm/qcs405/i2c.c
@@ -0,0 +1,181 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 - 2015, 2019 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <assert.h>
+#include <console/console.h>
+#include <delay.h>
+#include <device/i2c_simple.h>
+#include <stdlib.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,
+	400000,
+	19200000,
+	QUP_MODE_BLOCK,
+	0
+};
+
+static qup_config_t blsp1_qup1_config = {
+	QUP_MINICORE_I2C_MASTER,
+	400000,
+	19200000,
+	QUP_MODE_BLOCK,
+	0
+};
+
+static qup_config_t blsp1_qup2_config = {
+	QUP_MINICORE_I2C_MASTER,
+	400000,
+	19200000,
+	QUP_MODE_BLOCK,
+	0
+};
+
+static qup_config_t blsp1_qup3_config = {
+	QUP_MINICORE_I2C_MASTER,
+	400000,
+	19200000,
+	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_ret != QUP_SUCCESS)
+		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_ret != QUP_SUCCESS)
+		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;
+}
diff --git a/src/soc/qualcomm/qcs405/qup.c b/src/soc/qualcomm/qcs405/qup.c
new file mode 100644
index 0000000000..cff5241480
--- /dev/null
+++ b/src/soc/qualcomm/qcs405/qup.c
@@ -0,0 +1,609 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 - 2015, 2019 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <device/mmio.h>
+#include <console/console.h>
+#include <delay.h>
+#include <soc/gpio.h>
+#include <soc/iomap.h>
+#include <stdlib.h>
+#include <soc/qup.h>
+
+#define TIMEOUT_CNT	100
+
+#define QUP_ADDR(id, reg)	(blsp_qup_base(id) + (reg))
+
+#define QUP_DEBUG	0
+
+#define QUPDBG		BIOS_ERR, "\t-> "
+
+#if QUP_DEBUG
+#define qup_write32(a, v) do {				\
+	write32(a, v);					\
+	printk(QUPDBG "%s(%d): write32(0x%p, 0x%x)\n",	\
+			__func__, __LINE__, a, v);	\
+} while (0)
+#else
+#define qup_write32	write32
+#endif
+
+struct i2c_clk_div_fld {
+	u32	clk_freq_out;
+	u8	fs_div;
+	u8	ht_div;
+};
+
+static struct i2c_clk_div_fld i2c_clk_div_map[] = {
+	{100000, 124, 62},
+	{400000,  28, 14},
+	{1000000,  8,  5},
+};
+
+static void i2c_set_mstr_clk_ctl(unsigned int id, unsigned int hz)
+{
+	int i;
+	struct i2c_clk_div_fld *itr = i2c_clk_div_map;
+	u8 fs_div = 0;
+	u8 ht_div = 0;
+	u32 mstr_clk_ctl;
+
+	for (i = 0; i < ARRAY_SIZE(i2c_clk_div_map); ++i, ++itr) {
+		if (hz == itr->clk_freq_out) {
+			if (!fs_div)
+				fs_div = itr->fs_div;
+			if (!ht_div)
+				ht_div = itr->ht_div;
+			break;
+		}
+	}
+
+	/* format values in clk-ctl cache */
+	mstr_clk_ctl = ((ht_div & 0xff) << 16) | (fs_div & 0xff);
+	qup_write32(QUP_ADDR(id, QUP_I2C_MASTER_CLK_CTL), mstr_clk_ctl);
+}
+
+
+static qup_return_t qup_i2c_master_status(blsp_qup_id_t id)
+{
+	uint32_t reg_val = read32(QUP_ADDR(id, QUP_I2C_MASTER_STATUS));
+
+	if (read32(QUP_ADDR(id, QUP_ERROR_FLAGS)))
+		return QUP_ERR_XFER_FAIL;
+
+#if QUP_DEBUG
+	printk(QUPDBG "%s: 0x%x\n", __func__, reg_val);
+#endif
+
+	if (reg_val & QUP_I2C_INVALID_READ_ADDR)
+		return QUP_ERR_I2C_INVALID_SLAVE_ADDR;
+	if (reg_val & QUP_I2C_FAILED_MASK)
+		return QUP_ERR_I2C_FAILED;
+	if (reg_val & QUP_I2C_ARB_LOST)
+		return QUP_ERR_I2C_ARB_LOST;
+	if (reg_val & QUP_I2C_BUS_ERROR)
+		return QUP_ERR_I2C_BUS_ERROR;
+	if (reg_val & QUP_I2C_INVALID_WRITE)
+		return QUP_ERR_I2C_INVALID_WRITE;
+	if (reg_val & QUP_I2C_PACKET_NACK)
+		return QUP_ERR_I2C_NACK;
+	if (reg_val & QUP_I2C_INVALID_TAG)
+		return QUP_ERR_I2C_INVALID_TAG;
+
+	return QUP_SUCCESS;
+}
+
+static int check_bit_state(uint32_t *reg, int wait_for)
+{
+	unsigned int count = TIMEOUT_CNT;
+
+	while ((read32(reg) & (QUP_STATE_VALID_MASK | QUP_STATE_MASK)) !=
+			(QUP_STATE_VALID | wait_for)) {
+		if (count == 0)
+			return QUP_ERR_TIMEOUT;
+		count--;
+	}
+
+	return QUP_SUCCESS;
+}
+
+/*
+ * Check whether GSBIn_QUP State is valid
+ */
+static qup_return_t qup_wait_for_state(blsp_qup_id_t id, unsigned int wait_for)
+{
+	return check_bit_state(QUP_ADDR(id, QUP_STATE), wait_for);
+}
+
+qup_return_t qup_reset_i2c_master_status(blsp_qup_id_t id)
+{
+	/*
+	 * The I2C_STATUS is a status register.
+	 * Writing any value clears the status bits.
+	 */
+	qup_write32(QUP_ADDR(id, QUP_I2C_MASTER_STATUS), 0);
+	return QUP_SUCCESS;
+}
+
+static qup_return_t qup_reset_master_status(blsp_qup_id_t id)
+{
+	qup_write32(QUP_ADDR(id, QUP_ERROR_FLAGS), 0x3C);
+	qup_write32(QUP_ADDR(id, QUP_ERROR_FLAGS_EN), 0x3C);
+	qup_reset_i2c_master_status(id);
+	return QUP_SUCCESS;
+}
+
+static qup_return_t qup_fifo_wait_for(blsp_qup_id_t id, uint32_t status)
+{
+	qup_return_t ret = QUP_ERR_UNDEFINED;
+	unsigned int count = TIMEOUT_CNT;
+
+	while (!(read32(QUP_ADDR(id, QUP_OPERATIONAL)) & status)) {
+		ret = qup_i2c_master_status(id);
+		if (ret)
+			return ret;
+		if (count == 0)
+			return QUP_ERR_TIMEOUT;
+		count--;
+	}
+
+	return QUP_SUCCESS;
+}
+
+static qup_return_t qup_fifo_wait_while(blsp_qup_id_t id, uint32_t status)
+{
+	qup_return_t ret = QUP_ERR_UNDEFINED;
+	unsigned int count = TIMEOUT_CNT;
+
+	while (read32(QUP_ADDR(id, QUP_OPERATIONAL)) & status) {
+		ret = qup_i2c_master_status(id);
+		if (ret)
+			return ret;
+		if (count == 0)
+			return QUP_ERR_TIMEOUT;
+		count--;
+	}
+
+	return QUP_SUCCESS;
+}
+
+static inline uint32_t qup_i2c_create_output_tag(int stop, u8 data)
+{
+	uint32_t tag;
+
+	if (stop)
+		tag = QUP_I2C_STOP_SEQ | QUP_I2C_DATA(data);
+	else
+		tag = QUP_I2C_DATA_SEQ | QUP_I2C_DATA(data);
+
+	return tag;
+}
+
+static inline qup_return_t qup_i2c_write_fifo_flush(blsp_qup_id_t id)
+{
+	qup_return_t ret = QUP_ERR_UNDEFINED;
+
+	qup_write32(QUP_ADDR(id, QUP_OPERATIONAL), OUTPUT_SERVICE_FLAG);
+
+	mdelay(4);	/* TPM seems to need this */
+
+	ret = qup_fifo_wait_while(id, OUTPUT_FIFO_NOT_EMPTY);
+	if (ret)
+		return ret;
+
+	ret = qup_i2c_master_status(id);
+
+	if (ret)
+		printk(BIOS_DEBUG, "%s: error\n", __func__);
+
+	return ret;
+}
+
+static qup_return_t qup_i2c_write_fifo(blsp_qup_id_t id, qup_data_t *p_tx_obj,
+				       uint8_t stop_seq)
+{
+	qup_return_t ret = QUP_ERR_UNDEFINED;
+	uint8_t addr = p_tx_obj->p.iic.addr;
+	uint8_t *data_ptr = p_tx_obj->p.iic.data;
+	unsigned int data_len = p_tx_obj->p.iic.data_len;
+	unsigned int idx = 0;
+	uint32_t tag, *fifo = QUP_ADDR(id, QUP_OUTPUT_FIFO);
+
+	qup_reset_master_status(id);
+
+	qup_write32(QUP_ADDR(id, QUP_MX_OUTPUT_COUNT), data_len + 1);
+
+	qup_set_state(id, QUP_STATE_RUN);
+
+	/*
+	 * Since UNPACK enable is set in io mode register, populate 2 tags
+	 * for each fifo register.
+	 *
+	 * Create the first tag as follows, with the start tag and first byte
+	 * of the data to be written
+	 *	+--------+--------+--------+--------+
+	 *	| STOP / |  data  | START  | ADDR   |
+	 *	|DATA tag|  byte  |  tag   | << 1   |
+	 *	+--------+--------+--------+--------+
+	 * rest will be created in the following while loop.
+	 */
+	tag = qup_i2c_create_output_tag(data_len == 1 && stop_seq,
+					data_ptr[idx]);
+	tag = ((tag << 16) & 0xffff0000) |
+			(QUP_I2C_START_SEQ | QUP_I2C_ADDR(addr));
+	data_len--;
+	idx++;
+
+	qup_write32(fifo, tag);
+
+	while (data_len) {
+
+		tag = qup_i2c_create_output_tag(data_len == 1 && stop_seq,
+						data_ptr[idx]);
+		data_len--;
+		idx++;
+
+		if (data_len) {
+			tag |= qup_i2c_create_output_tag(
+						data_len == 1 && stop_seq,
+						data_ptr[idx]) << 16;
+			data_len--;
+			idx++;
+		}
+
+		qup_write32(fifo, tag);
+
+		ret = qup_i2c_write_fifo_flush(id);
+
+		if (ret) {
+			printk(QUPDBG "%s: error\n", __func__);
+			return ret;
+		}
+	}
+
+	ret = qup_i2c_write_fifo_flush(id);
+
+	qup_set_state(id, QUP_STATE_RESET);
+
+	return ret;
+}
+
+static qup_return_t qup_i2c_write(blsp_qup_id_t id, uint8_t mode,
+				  qup_data_t *p_tx_obj, uint8_t stop_seq)
+{
+	qup_return_t ret = QUP_ERR_UNDEFINED;
+
+	switch (mode) {
+	case QUP_MODE_FIFO:
+	case QUP_MODE_BLOCK:
+		ret = qup_i2c_write_fifo(id, p_tx_obj, stop_seq);
+		break;
+	default:
+		ret = QUP_ERR_UNSUPPORTED;
+	}
+
+	if (ret) {
+		qup_set_state(id, QUP_STATE_RESET);
+		printk(QUPDBG "%s() failed (%d)\n", __func__, ret);
+	}
+
+	return ret;
+}
+
+static int qup_i2c_parse_tag(uint32_t data, uint8_t *data_ptr, uint32_t len)
+{
+	int i, idx = 0;
+	int max = (len > 2) ? 2 : len;
+
+	for (i = 0; i < max; i++) {
+		switch (QUP_I2C_MI_TAG(data)) {
+		case QUP_I2C_MIDATA_SEQ:
+			data_ptr[idx] = QUP_I2C_DATA(data);
+			idx++;
+			break;
+		case QUP_I2C_MISTOP_SEQ:
+			data_ptr[idx] = QUP_I2C_DATA(data);
+			idx++;
+			return idx;
+		default:
+			printk(QUPDBG "%s: Unexpected tag (0x%x)\n", __func__,
+				QUP_I2C_MI_TAG(data));
+			return -1;
+		}
+
+		data = (data >> 16);
+	}
+
+	return idx;
+}
+
+static qup_return_t qup_i2c_read_fifo(blsp_qup_id_t id, qup_data_t *p_tx_obj)
+{
+	qup_return_t ret = QUP_ERR_UNDEFINED;
+	uint8_t addr = p_tx_obj->p.iic.addr;
+	uint8_t *data_ptr = p_tx_obj->p.iic.data;
+	unsigned int data_len = p_tx_obj->p.iic.data_len;
+	unsigned int idx = 0;
+	uint32_t *fifo = QUP_ADDR(id, QUP_OUTPUT_FIFO);
+
+	qup_reset_master_status(id);
+
+	qup_write32(QUP_ADDR(id, QUP_IO_MODES),
+		QUP_UNPACK_EN | QUP_PACK_EN |
+			  ((QUP_MODE_BLOCK & QUP_MODE_MASK) <<
+					QUP_OUTPUT_MODE_SHFT) |
+			  ((QUP_MODE_BLOCK & QUP_MODE_MASK) <<
+					QUP_INPUT_MODE_SHFT));
+
+	qup_write32(QUP_ADDR(id, QUP_MX_INPUT_COUNT), data_len);
+
+	qup_set_state(id, QUP_STATE_RUN);
+
+	qup_write32(fifo, (QUP_I2C_START_SEQ |
+				  (QUP_I2C_ADDR(addr) | QUP_I2C_SLAVE_READ)) |
+				((QUP_I2C_RECV_SEQ | data_len) << 16));
+
+	ret = qup_i2c_write_fifo_flush(id);
+	if (ret) {
+		printk(QUPDBG "%s: OUTPUT_FIFO_NOT_EMPTY\n", __func__);
+		return ret;
+	}
+
+	ret = qup_fifo_wait_for(id, INPUT_SERVICE_FLAG);
+	if (ret) {
+		printk(QUPDBG "%s: INPUT_SERVICE_FLAG\n", __func__);
+		return ret;
+	}
+
+	fifo = QUP_ADDR(id, QUP_INPUT_FIFO);
+
+	while (data_len) {
+		uint32_t data;
+		int count;
+
+		data = read32(fifo);
+		mdelay(1);
+
+		count = qup_i2c_parse_tag(data, data_ptr + idx, data_len);
+
+		if (count < 0) {
+			printk(QUPDBG "%s: Cannot parse tag 0x%x\n",
+						__func__, data);
+			qup_set_state(id, QUP_STATE_PAUSE);
+
+			return QUP_ERR_I2C_INVALID_TAG;
+		}
+
+		idx += count;
+		data_len -= count;
+
+		qup_write32(QUP_ADDR(id, QUP_OPERATIONAL), INPUT_SERVICE_FLAG);
+	}
+
+	p_tx_obj->p.iic.data_len = idx;
+
+	qup_write32(QUP_ADDR(id, QUP_MX_READ_COUNT), 0);
+
+	qup_set_state(id, QUP_STATE_RESET);
+
+	return QUP_SUCCESS;
+}
+
+static qup_return_t qup_i2c_read(blsp_qup_id_t id, uint8_t mode,
+				 qup_data_t *p_tx_obj)
+{
+	qup_return_t ret = QUP_ERR_UNDEFINED;
+
+	qup_set_state(id, QUP_STATE_RESET);
+
+	switch (mode) {
+	case QUP_MODE_FIFO:
+	case QUP_MODE_BLOCK:
+		ret = qup_i2c_read_fifo(id, p_tx_obj);
+		break;
+	default:
+		ret = QUP_ERR_UNSUPPORTED;
+	}
+
+	if (ret) {
+		qup_set_state(id, QUP_STATE_RESET);
+		printk(QUPDBG "%s() failed (%d)\n", __func__, ret);
+	}
+
+	return ret;
+}
+
+qup_return_t qup_init(blsp_qup_id_t id, const qup_config_t *config_ptr)
+{
+	qup_return_t ret = QUP_ERR_UNDEFINED;
+	uint32_t reg_val;
+
+	/* Reset the QUP core.*/
+	qup_write32(QUP_ADDR(id, QUP_SW_RESET), 0x1);
+
+	/* Wait till the reset takes effect */
+	ret = qup_wait_for_state(id, QUP_STATE_RESET);
+	if (ret)
+		goto bailout;
+
+	/* Reset the config */
+	qup_write32(QUP_ADDR(id, QUP_CONFIG), 0);
+
+	/* Program the config register */
+	/* Set N value */
+	reg_val = 0x0F;
+	/* Set protocol */
+	switch (config_ptr->protocol) {
+	case QUP_MINICORE_I2C_MASTER:
+		reg_val |= ((config_ptr->protocol &
+				QUP_MINI_CORE_PROTO_MASK) <<
+				QUP_MINI_CORE_PROTO_SHFT);
+		break;
+	default:
+		ret = QUP_ERR_UNSUPPORTED;
+		goto bailout;
+	}
+	reg_val |= QUP_APP_CLK_ON_EN | QUP_CORE_CLK_ON_EN;
+	qup_write32(QUP_ADDR(id, QUP_CONFIG), reg_val);
+
+	/* Choose version 1 tag */
+	qup_write32(QUP_ADDR(id, QUP_I2C_MASTER_CONFIG), 0);
+
+	/* Reset i2c clk cntl register */
+	qup_write32(QUP_ADDR(id, QUP_I2C_MASTER_CLK_CTL), 0);
+
+	/* Set QUP IO Mode */
+	switch (config_ptr->mode) {
+	case QUP_MODE_FIFO:
+	case QUP_MODE_BLOCK:
+		reg_val = QUP_UNPACK_EN | QUP_PACK_EN |
+			  ((config_ptr->mode & QUP_MODE_MASK) <<
+					QUP_OUTPUT_MODE_SHFT) |
+			  ((config_ptr->mode & QUP_MODE_MASK) <<
+					QUP_INPUT_MODE_SHFT);
+		break;
+	default:
+		ret = QUP_ERR_UNSUPPORTED;
+		goto bailout;
+	}
+	qup_write32(QUP_ADDR(id, QUP_IO_MODES), reg_val);
+
+	/*Set i2c clk cntl*/
+	i2c_set_mstr_clk_ctl(id, 400000);
+
+	qup_set_state(id, QUP_STATE_RESET);
+bailout:
+	if (ret)
+		printk(QUPDBG "failed to init qup (%d)\n", ret);
+
+	return ret;
+}
+
+qup_return_t qup_set_state(blsp_qup_id_t id, uint32_t state)
+{
+	qup_return_t ret = QUP_ERR_UNDEFINED;
+	unsigned int curr_state = read32(QUP_ADDR(id, QUP_STATE));
+
+	if ((state <= QUP_STATE_PAUSE)
+		&& (curr_state & QUP_STATE_VALID_MASK)) {
+		/*
+		* For PAUSE_STATE to RESET_STATE transition,
+		* two writes of  10[binary]) are required for the
+		* transition to complete.
+		*/
+		if (curr_state == QUP_STATE_PAUSE && state == QUP_STATE_RESET) {
+			qup_write32(QUP_ADDR(id, QUP_STATE), 0x2);
+			qup_write32(QUP_ADDR(id, QUP_STATE), 0x2);
+		} else {
+			qup_write32(QUP_ADDR(id, QUP_STATE), state);
+		}
+		ret = qup_wait_for_state(id, state);
+	}
+
+	return ret;
+}
+
+static qup_return_t qup_i2c_send_data(blsp_qup_id_t id, qup_data_t *p_tx_obj,
+				      uint8_t stop_seq)
+{
+	qup_return_t ret = QUP_ERR_UNDEFINED;
+	uint8_t mode = (read32(QUP_ADDR(id, QUP_IO_MODES)) >>
+			QUP_OUTPUT_MODE_SHFT) & QUP_MODE_MASK;
+
+	ret = qup_i2c_write(id, mode, p_tx_obj, stop_seq);
+	if (QUP_DEBUG) {
+		int i;
+
+		printk(BIOS_DEBUG, "i2c tx bus %d device %2.2x:",
+		       id, p_tx_obj->p.iic.addr);
+		for (i = 0; i < p_tx_obj->p.iic.data_len; i++)
+			printk(BIOS_DEBUG, " %2.2x", p_tx_obj->p.iic.data[i]);
+		printk(BIOS_DEBUG, "\n");
+	}
+
+	return ret;
+}
+
+qup_return_t qup_send_data(blsp_qup_id_t id, qup_data_t *p_tx_obj,
+			   uint8_t stop_seq)
+{
+	qup_return_t ret = QUP_ERR_UNDEFINED;
+
+	if (p_tx_obj->protocol == ((read32(QUP_ADDR(id, QUP_CONFIG)) >>
+			QUP_MINI_CORE_PROTO_SHFT) & QUP_MINI_CORE_PROTO_MASK)) {
+		switch (p_tx_obj->protocol) {
+		case QUP_MINICORE_I2C_MASTER:
+			ret = qup_i2c_send_data(id, p_tx_obj, stop_seq);
+			break;
+		default:
+			ret = QUP_ERR_UNSUPPORTED;
+		}
+	}
+
+	return ret;
+}
+
+static qup_return_t qup_i2c_recv_data(blsp_qup_id_t id, qup_data_t *p_rx_obj)
+{
+	qup_return_t ret = QUP_ERR_UNDEFINED;
+	uint8_t mode = (read32(QUP_ADDR(id, QUP_IO_MODES)) >>
+			QUP_INPUT_MODE_SHFT) & QUP_MODE_MASK;
+
+	ret = qup_i2c_read(id, mode, p_rx_obj);
+	if (QUP_DEBUG) {
+		int i;
+
+		printk(BIOS_DEBUG, "i2c rxed on bus %d device %2.2x:",
+		       id, p_rx_obj->p.iic.addr);
+		for (i = 0; i < p_rx_obj->p.iic.data_len; i++)
+			printk(BIOS_DEBUG, " %2.2x", p_rx_obj->p.iic.data[i]);
+		printk(BIOS_DEBUG, "\n");
+	}
+
+	return ret;
+}
+
+qup_return_t qup_recv_data(blsp_qup_id_t id, qup_data_t *p_rx_obj)
+{
+	qup_return_t ret = QUP_ERR_UNDEFINED;
+
+	if (p_rx_obj->protocol == ((read32(QUP_ADDR(id, QUP_CONFIG)) >>
+			QUP_MINI_CORE_PROTO_SHFT) & QUP_MINI_CORE_PROTO_MASK)) {
+		switch (p_rx_obj->protocol) {
+		case QUP_MINICORE_I2C_MASTER:
+			ret = qup_i2c_recv_data(id, p_rx_obj);
+			break;
+		default:
+			ret = QUP_ERR_UNSUPPORTED;
+		}
+	}
+
+	return ret;
+}