drivers/i2c/busses/i2c-qcom-geni.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (c) 2017, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  */

 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/qcom-geni-se.h>

 #define SE_I2C_TX_TRANS_LEN		(0x26C)
 #define SE_I2C_RX_TRANS_LEN		(0x270)
 #define SE_I2C_SCL_COUNTERS		(0x278)

 #define SE_I2C_ERR  (M_CMD_OVERRUN_EN | M_ILLEGAL_CMD_EN | M_CMD_FAILURE_EN |\
 			M_GP_IRQ_1_EN | M_GP_IRQ_3_EN | M_GP_IRQ_4_EN)
 #define SE_I2C_ABORT (1U << 1)
 /* M_CMD OP codes for I2C */
 #define I2C_WRITE		(0x1)
 #define I2C_READ		(0x2)
 #define I2C_WRITE_READ		(0x3)
 #define I2C_ADDR_ONLY		(0x4)
 #define I2C_BUS_CLEAR		(0x6)
 #define I2C_STOP_ON_BUS		(0x7)
 /* M_CMD params for I2C */
 #define PRE_CMD_DELAY		(BIT(0))
 #define TIMESTAMP_BEFORE	(BIT(1))
 #define STOP_STRETCH		(BIT(2))
 #define TIMESTAMP_AFTER		(BIT(3))
 #define POST_COMMAND_DELAY	(BIT(4))
 #define IGNORE_ADD_NACK		(BIT(6))
 #define READ_FINISHED_WITH_ACK	(BIT(7))
 #define BYPASS_ADDR_PHASE	(BIT(8))
 #define SLV_ADDR_MSK		(GENMASK(15, 9))
 #define SLV_ADDR_SHFT		(9)

 #define I2C_CORE2X_VOTE		(10000)

 struct geni_i2c_dev {
 	struct device *dev;
 	void __iomem *base;
 	unsigned int tx_wm;
 	int irq;
 	int err;
 	struct i2c_adapter adap;
 	struct completion xfer;
 	struct i2c_msg *cur;
 	struct se_geni_rsc i2c_rsc;
 	int cur_wr;
 	int cur_rd;
 	struct device *wrapper_dev;
 };

 static inline void qcom_geni_i2c_conf(void __iomem *base, int dfs, int div)
 {
 	geni_write_reg(dfs, base, SE_GENI_CLK_SEL);
 	geni_write_reg((div << 4) | 1, base, GENI_SER_M_CLK_CFG);
 	geni_write_reg(((5 << 20) | (0xC << 10) | 0x18),
 				base, SE_I2C_SCL_COUNTERS);
 	/*
 	 * Ensure Clk config completes before return.
 	 */
 	mb();
 }

 static irqreturn_t geni_i2c_irq(int irq, void *dev)
 {
 	struct geni_i2c_dev *gi2c = dev;
 	int i, j;
 	u32 m_stat = readl_relaxed(gi2c->base + SE_GENI_M_IRQ_STATUS);
 	u32 tx_stat = readl_relaxed(gi2c->base + SE_GENI_TX_FIFO_STATUS);
 	u32 rx_stat = readl_relaxed(gi2c->base + SE_GENI_RX_FIFO_STATUS);
 	struct i2c_msg *cur = gi2c->cur;

 	dev_dbg(gi2c->dev,
 		"got i2c irq:%d, stat:0x%x, tx stat:0x%x, rx stat:0x%x\n",
 		irq, m_stat, tx_stat, rx_stat);
 	if (!cur || m_stat & SE_I2C_ERR) {
 		dev_err(gi2c->dev, "i2c txn err");
 		writel_relaxed(0, (gi2c->base + SE_GENI_TX_WATERMARK_REG));
 		gi2c->err = -EIO;
 		goto irqret;
 	}
 	if (((m_stat & M_RX_FIFO_WATERMARK_EN) ||
 		(m_stat & M_RX_FIFO_LAST_EN)) && (cur->flags & I2C_M_RD)) {
 		u32 rxcnt = rx_stat & RX_FIFO_WC_MSK;

 		for (j = 0; j < rxcnt; j++) {
 			u32 temp;
 			int p;

 			temp = readl_relaxed(gi2c->base + SE_GENI_RX_FIFOn);
 			for (i = gi2c->cur_rd, p = 0; (i < cur->len && p < 4);
 				i++, p++)
 				cur->buf[i] = (u8) ((temp >> (p * 8)) & 0xff);
 			gi2c->cur_rd = i;
 			if (gi2c->cur_rd == cur->len) {
 				dev_dbg(gi2c->dev, "i:%d,read 0x%x\n", i, temp);
 				break;
 			}
 			dev_dbg(gi2c->dev, "i: %d, read 0x%x\n", i, temp);
 		}
 	} else if ((m_stat & M_TX_FIFO_WATERMARK_EN) &&
 					!(cur->flags & I2C_M_RD)) {
 		for (j = 0; j < gi2c->tx_wm; j++) {
 			u32 temp = 0;
 			int p;

 			for (i = gi2c->cur_wr, p = 0; (i < cur->len && p < 4);
 				i++, p++)
 				temp |= (((u32)(cur->buf[i]) << (p * 8)));
 			writel_relaxed(temp, gi2c->base + SE_GENI_TX_FIFOn);
 			gi2c->cur_wr = i;
 			dev_dbg(gi2c->dev, "i:%d,wrote 0x%x\n", i, temp);
 			if (gi2c->cur_wr == cur->len) {
 				dev_dbg(gi2c->dev, "i2c bytes done writing\n");
 				writel_relaxed(0,
 				(gi2c->base + SE_GENI_TX_WATERMARK_REG));
 				break;
 			}
 		}
 	}
 irqret:
 	writel_relaxed(m_stat, gi2c->base + SE_GENI_M_IRQ_CLEAR);
 	/* Ensure all writes are done before returning from ISR. */
 	wmb();
 	/* if this is err with done-bit not set, handle that thr' timeout. */
 	if (m_stat & M_CMD_DONE_EN) {
 		dev_dbg(gi2c->dev, "i2c irq: err:%d, stat:0x%x\n",
 							gi2c->err, m_stat);
 		complete(&gi2c->xfer);
 	}
 	return IRQ_HANDLED;
 }

 static int geni_i2c_xfer(struct i2c_adapter *adap,
 			 struct i2c_msg msgs[],
 			 int num)
 {
 	struct geni_i2c_dev *gi2c = i2c_get_adapdata(adap);
 	int i, ret = 0, timeout = 0;

 	gi2c->err = 0;
 	gi2c->cur = &msgs[0];
 	reinit_completion(&gi2c->xfer);
 	ret = pm_runtime_get_sync(gi2c->dev);
 	if (ret < 0) {
 		dev_err(gi2c->dev, "error turning SE resources:%d\n", ret);
 		pm_runtime_put_noidle(gi2c->dev);
 		/* Set device in suspended since resume failed */
 		pm_runtime_set_suspended(gi2c->dev);
 		return ret;
 	}
 	qcom_geni_i2c_conf(gi2c->base, 0, 2);
 	dev_dbg(gi2c->dev, "i2c xfer:num:%d, msgs:len:%d,flg:%d\n",
 				num, msgs[0].len, msgs[0].flags);
 	for (i = 0; i < num; i++) {
 		int stretch = (i < (num - 1));
 		u32 m_param = 0;
 		u32 m_cmd = 0;

 		m_param |= (stretch ? STOP_STRETCH : 0);
 		m_param |= ((msgs[i].addr & 0x7F) << SLV_ADDR_SHFT);

 		gi2c->cur = &msgs[i];
 		if (msgs[i].flags & I2C_M_RD) {
 			dev_dbg(gi2c->dev,
 				"READ,n:%d,i:%d len:%d, stretch:%d\n",
 					num, i, msgs[i].len, stretch);
 			geni_write_reg(msgs[i].len,
 				       gi2c->base, SE_I2C_RX_TRANS_LEN);
 			m_cmd = I2C_READ;
 			geni_setup_m_cmd(gi2c->base, m_cmd, m_param);
 		} else {
 			dev_dbg(gi2c->dev,
 				"WRITE:n:%d,i%d len:%d, stretch:%d\n",
 					num, i, msgs[i].len, stretch);
 			geni_write_reg(msgs[i].len, gi2c->base,
 						SE_I2C_TX_TRANS_LEN);
 			m_cmd = I2C_WRITE;
 			geni_setup_m_cmd(gi2c->base, m_cmd, m_param);
 			/* Get FIFO IRQ */
 			geni_write_reg(1, gi2c->base, SE_GENI_TX_WATERMARK_REG);
 		}
 		/* Ensure FIFO write go through before waiting for Done evet */
 		mb();
 		timeout = wait_for_completion_timeout(&gi2c->xfer, HZ);
 		if (!timeout) {
 			dev_err(gi2c->dev, "Timed out\n");
 			gi2c->err = -ETIMEDOUT;
 			gi2c->cur = NULL;
 			geni_abort_m_cmd(gi2c->base);
 			timeout = wait_for_completion_timeout(&gi2c->xfer, HZ);
 		}
 		gi2c->cur_wr = 0;
 		gi2c->cur_rd = 0;
 		if (gi2c->err) {
 			dev_err(gi2c->dev, "i2c error :%d\n", gi2c->err);
 			ret = gi2c->err;
 			break;
 		}
 	}
 	if (ret == 0)
 		ret = i;
 	pm_runtime_put_sync(gi2c->dev);
 	gi2c->cur = NULL;
 	gi2c->err = 0;
 	dev_dbg(gi2c->dev, "i2c txn ret:%d\n", ret);
 	return ret;
 }

 static u32 geni_i2c_func(struct i2c_adapter *adap)
 {
 	return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
 }

 static const struct i2c_algorithm geni_i2c_algo = {
 	.master_xfer	= geni_i2c_xfer,
 	.functionality	= geni_i2c_func,
 };

 static int geni_i2c_probe(struct platform_device *pdev)
 {
 	struct geni_i2c_dev *gi2c;
 	struct resource *res;
 	struct platform_device *wrapper_pdev;
 	struct device_node *wrapper_ph_node;
 	int ret;

 	gi2c = devm_kzalloc(&pdev->dev, sizeof(*gi2c), GFP_KERNEL);
 	if (!gi2c)
 		return -ENOMEM;

 	gi2c->dev = &pdev->dev;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res)
 		return -EINVAL;

 	wrapper_ph_node = of_parse_phandle(pdev->dev.of_node,
 				"qcom,wrapper-core", 0);
 	if (IS_ERR_OR_NULL(wrapper_ph_node)) {
 		ret = PTR_ERR(wrapper_ph_node);
 		dev_err(&pdev->dev, "No wrapper core defined\n");
 		return ret;
 	}
 	wrapper_pdev = of_find_device_by_node(wrapper_ph_node);
 	of_node_put(wrapper_ph_node);
 	if (IS_ERR_OR_NULL(wrapper_pdev)) {
 		ret = PTR_ERR(wrapper_pdev);
 		dev_err(&pdev->dev, "Cannot retrieve wrapper device\n");
 		return ret;
 	}
 	gi2c->wrapper_dev = &wrapper_pdev->dev;
 	gi2c->i2c_rsc.wrapper_dev = &wrapper_pdev->dev;
 	ret = geni_se_resources_init(&gi2c->i2c_rsc, I2C_CORE2X_VOTE,
 				     (DEFAULT_SE_CLK * DEFAULT_BUS_WIDTH));
 	if (ret) {
 		dev_err(gi2c->dev, "geni_se_resources_init\n");
 		return ret;
 	}

 	gi2c->i2c_rsc.se_clk = devm_clk_get(&pdev->dev, "se-clk");
 	if (IS_ERR(gi2c->i2c_rsc.se_clk)) {
 		ret = PTR_ERR(gi2c->i2c_rsc.se_clk);
 		dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret);
 		return ret;
 	}

 	gi2c->i2c_rsc.m_ahb_clk = devm_clk_get(&pdev->dev, "m-ahb");
 	if (IS_ERR(gi2c->i2c_rsc.m_ahb_clk)) {
 		ret = PTR_ERR(gi2c->i2c_rsc.m_ahb_clk);
 		dev_err(&pdev->dev, "Err getting M AHB clk %d\n", ret);
 		return ret;
 	}

 	gi2c->i2c_rsc.s_ahb_clk = devm_clk_get(&pdev->dev, "s-ahb");
 	if (IS_ERR(gi2c->i2c_rsc.s_ahb_clk)) {
 		ret = PTR_ERR(gi2c->i2c_rsc.s_ahb_clk);
 		dev_err(&pdev->dev, "Err getting S AHB clk %d\n", ret);
 		return ret;
 	}

 	gi2c->base = devm_ioremap_resource(gi2c->dev, res);
 	if (IS_ERR(gi2c->base))
 		return PTR_ERR(gi2c->base);

 	gi2c->i2c_rsc.geni_pinctrl = devm_pinctrl_get(&pdev->dev);
 	if (IS_ERR_OR_NULL(gi2c->i2c_rsc.geni_pinctrl)) {
 		dev_err(&pdev->dev, "No pinctrl config specified\n");
 		ret = PTR_ERR(gi2c->i2c_rsc.geni_pinctrl);
 		return ret;
 	}
 	gi2c->i2c_rsc.geni_gpio_active =
 		pinctrl_lookup_state(gi2c->i2c_rsc.geni_pinctrl,
 							PINCTRL_DEFAULT);
 	if (IS_ERR_OR_NULL(gi2c->i2c_rsc.geni_gpio_active)) {
 		dev_err(&pdev->dev, "No default config specified\n");
 		ret = PTR_ERR(gi2c->i2c_rsc.geni_gpio_active);
 		return ret;
 	}
 	gi2c->i2c_rsc.geni_gpio_sleep =
 		pinctrl_lookup_state(gi2c->i2c_rsc.geni_pinctrl,
 							PINCTRL_SLEEP);
 	if (IS_ERR_OR_NULL(gi2c->i2c_rsc.geni_gpio_sleep)) {
 		dev_err(&pdev->dev, "No sleep config specified\n");
 		ret = PTR_ERR(gi2c->i2c_rsc.geni_gpio_sleep);
 		return ret;
 	}

 	gi2c->irq = platform_get_irq(pdev, 0);
 	if (gi2c->irq < 0) {
 		dev_err(gi2c->dev, "IRQ error for i2c-geni\n");
 		return gi2c->irq;
 	}

 	gi2c->adap.algo = &geni_i2c_algo;
 	init_completion(&gi2c->xfer);
 	platform_set_drvdata(pdev, gi2c);
 	ret = devm_request_irq(gi2c->dev, gi2c->irq, geni_i2c_irq,
 			       IRQF_TRIGGER_HIGH, "i2c_geni", gi2c);
 	if (ret) {
 		dev_err(gi2c->dev, "Request_irq failed:%d: err:%d\n",
 				   gi2c->irq, ret);
 		return ret;
 	}
 	disable_irq(gi2c->irq);
 	i2c_set_adapdata(&gi2c->adap, gi2c);
 	gi2c->adap.dev.parent = gi2c->dev;
 	gi2c->adap.dev.of_node = pdev->dev.of_node;

 	strlcpy(gi2c->adap.name, "Geni-I2C", sizeof(gi2c->adap.name));

 	pm_runtime_set_suspended(gi2c->dev);
 	pm_runtime_enable(gi2c->dev);
 	i2c_add_adapter(&gi2c->adap);

 	return 0;
 }

 static int geni_i2c_remove(struct platform_device *pdev)
 {
 	struct geni_i2c_dev *gi2c = platform_get_drvdata(pdev);

 	pm_runtime_disable(gi2c->dev);
 	i2c_del_adapter(&gi2c->adap);
 	return 0;
 }

 static int geni_i2c_resume_noirq(struct device *device)
 {
 	return 0;
 }

 #ifdef CONFIG_PM
 static int geni_i2c_runtime_suspend(struct device *dev)
 {
 	struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);

 	disable_irq(gi2c->irq);
 	se_geni_resources_off(&gi2c->i2c_rsc);
 	return 0;
 }

 static int geni_i2c_runtime_resume(struct device *dev)
 {
 	int ret;
 	struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);

 	ret = se_geni_resources_on(&gi2c->i2c_rsc);
 	if (ret)
 		return ret;

 	if (unlikely(!gi2c->tx_wm)) {
 		int gi2c_tx_depth = get_tx_fifo_depth(gi2c->base);

 		gi2c->tx_wm = gi2c_tx_depth - 1;
 		geni_se_init(gi2c->base, gi2c->tx_wm, gi2c_tx_depth);
 		geni_se_select_mode(gi2c->base, FIFO_MODE);
 		se_config_packing(gi2c->base, 8, 4, true);
 	}
 	enable_irq(gi2c->irq);
 	return 0;
 }

 static int geni_i2c_suspend_noirq(struct device *device)
 {
 	if (!pm_runtime_status_suspended(device))
 		return -EBUSY;
 	return 0;
 }
 #else
 static int geni_i2c_runtime_suspend(struct device *dev)
 {
 	return 0;
 }

 static int geni_i2c_runtime_resume(struct device *dev)
 {
 	return 0;
 }

 static int geni_i2c_suspend_noirq(struct device *device)
 {
 	return 0;
 }
 #endif

 static const struct dev_pm_ops geni_i2c_pm_ops = {
 	.suspend_noirq		= geni_i2c_suspend_noirq,
 	.resume_noirq		= geni_i2c_resume_noirq,
 	.runtime_suspend	= geni_i2c_runtime_suspend,
 	.runtime_resume		= geni_i2c_runtime_resume,
 };

 static const struct of_device_id geni_i2c_dt_match[] = {
 	{ .compatible = "qcom,i2c-geni" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, geni_i2c_dt_match);

 static struct platform_driver geni_i2c_driver = {
 	.probe  = geni_i2c_probe,
 	.remove = geni_i2c_remove,
 	.driver = {
 		.name = "i2c_geni",
 		.pm = &geni_i2c_pm_ops,
 		.of_match_table = geni_i2c_dt_match,
 	},
 };

 module_platform_driver(geni_i2c_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:i2c_geni");
	/*
	* Copyright (c) 2017, The Linux Foundation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	*/

	#include <linux/clk.h>
	#include <linux/delay.h>
	#include <linux/err.h>
	#include <linux/i2c.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_platform.h>
	#include <linux/platform_device.h>
	#include <linux/pm_runtime.h>
	#include <linux/qcom-geni-se.h>

	#define SE_I2C_TX_TRANS_LEN (0x26C)
	#define SE_I2C_RX_TRANS_LEN (0x270)
	#define SE_I2C_SCL_COUNTERS (0x278)

	#define SE_I2C_ERR (M_CMD_OVERRUN_EN \| M_ILLEGAL_CMD_EN \| M_CMD_FAILURE_EN \|\
	M_GP_IRQ_1_EN \| M_GP_IRQ_3_EN \| M_GP_IRQ_4_EN)
	#define SE_I2C_ABORT (1U << 1)
	/* M_CMD OP codes for I2C */
	#define I2C_WRITE (0x1)
	#define I2C_READ (0x2)
	#define I2C_WRITE_READ (0x3)
	#define I2C_ADDR_ONLY (0x4)
	#define I2C_BUS_CLEAR (0x6)
	#define I2C_STOP_ON_BUS (0x7)
	/* M_CMD params for I2C */
	#define PRE_CMD_DELAY (BIT(0))
	#define TIMESTAMP_BEFORE (BIT(1))
	#define STOP_STRETCH (BIT(2))
	#define TIMESTAMP_AFTER (BIT(3))
	#define POST_COMMAND_DELAY (BIT(4))
	#define IGNORE_ADD_NACK (BIT(6))
	#define READ_FINISHED_WITH_ACK (BIT(7))
	#define BYPASS_ADDR_PHASE (BIT(8))
	#define SLV_ADDR_MSK (GENMASK(15, 9))
	#define SLV_ADDR_SHFT (9)

	#define I2C_CORE2X_VOTE (10000)

	struct geni_i2c_dev {
	struct device *dev;
	void __iomem *base;
	unsigned int tx_wm;
	int irq;
	int err;
	struct i2c_adapter adap;
	struct completion xfer;
	struct i2c_msg *cur;
	struct se_geni_rsc i2c_rsc;
	int cur_wr;
	int cur_rd;
	struct device *wrapper_dev;
	};

	static inline void qcom_geni_i2c_conf(void __iomem *base, int dfs, int div)
	{
	geni_write_reg(dfs, base, SE_GENI_CLK_SEL);
	geni_write_reg((div << 4) \| 1, base, GENI_SER_M_CLK_CFG);
	geni_write_reg(((5 << 20) \| (0xC << 10) \| 0x18),
	base, SE_I2C_SCL_COUNTERS);
	/*
	* Ensure Clk config completes before return.
	*/
	mb();
	}

	static irqreturn_t geni_i2c_irq(int irq, void *dev)
	{
	struct geni_i2c_dev *gi2c = dev;
	int i, j;
	u32 m_stat = readl_relaxed(gi2c->base + SE_GENI_M_IRQ_STATUS);
	u32 tx_stat = readl_relaxed(gi2c->base + SE_GENI_TX_FIFO_STATUS);
	u32 rx_stat = readl_relaxed(gi2c->base + SE_GENI_RX_FIFO_STATUS);
	struct i2c_msg *cur = gi2c->cur;

	dev_dbg(gi2c->dev,
	"got i2c irq:%d, stat:0x%x, tx stat:0x%x, rx stat:0x%x\n",
	irq, m_stat, tx_stat, rx_stat);
	if (!cur \|\| m_stat & SE_I2C_ERR) {
	dev_err(gi2c->dev, "i2c txn err");
	writel_relaxed(0, (gi2c->base + SE_GENI_TX_WATERMARK_REG));
	gi2c->err = -EIO;
	goto irqret;
	}
	if (((m_stat & M_RX_FIFO_WATERMARK_EN) \|\|
	(m_stat & M_RX_FIFO_LAST_EN)) && (cur->flags & I2C_M_RD)) {
	u32 rxcnt = rx_stat & RX_FIFO_WC_MSK;

	for (j = 0; j < rxcnt; j++) {
	u32 temp;
	int p;

	temp = readl_relaxed(gi2c->base + SE_GENI_RX_FIFOn);
	for (i = gi2c->cur_rd, p = 0; (i < cur->len && p < 4);
	i++, p++)
	cur->buf[i] = (u8) ((temp >> (p * 8)) & 0xff);
	gi2c->cur_rd = i;
	if (gi2c->cur_rd == cur->len) {
	dev_dbg(gi2c->dev, "i:%d,read 0x%x\n", i, temp);
	break;
	}
	dev_dbg(gi2c->dev, "i: %d, read 0x%x\n", i, temp);
	}
	} else if ((m_stat & M_TX_FIFO_WATERMARK_EN) &&
	!(cur->flags & I2C_M_RD)) {
	for (j = 0; j < gi2c->tx_wm; j++) {
	u32 temp = 0;
	int p;

	for (i = gi2c->cur_wr, p = 0; (i < cur->len && p < 4);
	i++, p++)
	temp \|= (((u32)(cur->buf[i]) << (p * 8)));
	writel_relaxed(temp, gi2c->base + SE_GENI_TX_FIFOn);
	gi2c->cur_wr = i;
	dev_dbg(gi2c->dev, "i:%d,wrote 0x%x\n", i, temp);
	if (gi2c->cur_wr == cur->len) {
	dev_dbg(gi2c->dev, "i2c bytes done writing\n");
	writel_relaxed(0,
	(gi2c->base + SE_GENI_TX_WATERMARK_REG));
	break;
	}
	}
	}
	irqret:
	writel_relaxed(m_stat, gi2c->base + SE_GENI_M_IRQ_CLEAR);
	/* Ensure all writes are done before returning from ISR. */
	wmb();
	/* if this is err with done-bit not set, handle that thr' timeout. */
	if (m_stat & M_CMD_DONE_EN) {
	dev_dbg(gi2c->dev, "i2c irq: err:%d, stat:0x%x\n",
	gi2c->err, m_stat);
	complete(&gi2c->xfer);
	}
	return IRQ_HANDLED;
	}

	static int geni_i2c_xfer(struct i2c_adapter *adap,
	struct i2c_msg msgs[],
	int num)
	{
	struct geni_i2c_dev *gi2c = i2c_get_adapdata(adap);
	int i, ret = 0, timeout = 0;

	gi2c->err = 0;
	gi2c->cur = &msgs[0];
	reinit_completion(&gi2c->xfer);
	ret = pm_runtime_get_sync(gi2c->dev);
	if (ret < 0) {
	dev_err(gi2c->dev, "error turning SE resources:%d\n", ret);
	pm_runtime_put_noidle(gi2c->dev);
	/* Set device in suspended since resume failed */
	pm_runtime_set_suspended(gi2c->dev);
	return ret;
	}
	qcom_geni_i2c_conf(gi2c->base, 0, 2);
	dev_dbg(gi2c->dev, "i2c xfer:num:%d, msgs:len:%d,flg:%d\n",
	num, msgs[0].len, msgs[0].flags);
	for (i = 0; i < num; i++) {
	int stretch = (i < (num - 1));
	u32 m_param = 0;
	u32 m_cmd = 0;

	m_param \|= (stretch ? STOP_STRETCH : 0);
	m_param \|= ((msgs[i].addr & 0x7F) << SLV_ADDR_SHFT);

	gi2c->cur = &msgs[i];
	if (msgs[i].flags & I2C_M_RD) {
	dev_dbg(gi2c->dev,
	"READ,n:%d,i:%d len:%d, stretch:%d\n",
	num, i, msgs[i].len, stretch);
	geni_write_reg(msgs[i].len,
	gi2c->base, SE_I2C_RX_TRANS_LEN);
	m_cmd = I2C_READ;
	geni_setup_m_cmd(gi2c->base, m_cmd, m_param);
	} else {
	dev_dbg(gi2c->dev,
	"WRITE:n:%d,i%d len:%d, stretch:%d\n",
	num, i, msgs[i].len, stretch);
	geni_write_reg(msgs[i].len, gi2c->base,
	SE_I2C_TX_TRANS_LEN);
	m_cmd = I2C_WRITE;
	geni_setup_m_cmd(gi2c->base, m_cmd, m_param);
	/* Get FIFO IRQ */
	geni_write_reg(1, gi2c->base, SE_GENI_TX_WATERMARK_REG);
	}
	/* Ensure FIFO write go through before waiting for Done evet */
	mb();
	timeout = wait_for_completion_timeout(&gi2c->xfer, HZ);
	if (!timeout) {
	dev_err(gi2c->dev, "Timed out\n");
	gi2c->err = -ETIMEDOUT;
	gi2c->cur = NULL;
	geni_abort_m_cmd(gi2c->base);
	timeout = wait_for_completion_timeout(&gi2c->xfer, HZ);
	}
	gi2c->cur_wr = 0;
	gi2c->cur_rd = 0;
	if (gi2c->err) {
	dev_err(gi2c->dev, "i2c error :%d\n", gi2c->err);
	ret = gi2c->err;
	break;
	}
	}
	if (ret == 0)
	ret = i;
	pm_runtime_put_sync(gi2c->dev);
	gi2c->cur = NULL;
	gi2c->err = 0;
	dev_dbg(gi2c->dev, "i2c txn ret:%d\n", ret);
	return ret;
	}

	static u32 geni_i2c_func(struct i2c_adapter *adap)
	{
	return I2C_FUNC_I2C \| (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
	}

	static const struct i2c_algorithm geni_i2c_algo = {
	.master_xfer = geni_i2c_xfer,
	.functionality = geni_i2c_func,
	};

	static int geni_i2c_probe(struct platform_device *pdev)
	{
	struct geni_i2c_dev *gi2c;
	struct resource *res;
	struct platform_device *wrapper_pdev;
	struct device_node *wrapper_ph_node;
	int ret;

	gi2c = devm_kzalloc(&pdev->dev, sizeof(*gi2c), GFP_KERNEL);
	if (!gi2c)
	return -ENOMEM;

	gi2c->dev = &pdev->dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
	return -EINVAL;

	wrapper_ph_node = of_parse_phandle(pdev->dev.of_node,
	"qcom,wrapper-core", 0);
	if (IS_ERR_OR_NULL(wrapper_ph_node)) {
	ret = PTR_ERR(wrapper_ph_node);
	dev_err(&pdev->dev, "No wrapper core defined\n");
	return ret;
	}
	wrapper_pdev = of_find_device_by_node(wrapper_ph_node);
	of_node_put(wrapper_ph_node);
	if (IS_ERR_OR_NULL(wrapper_pdev)) {
	ret = PTR_ERR(wrapper_pdev);
	dev_err(&pdev->dev, "Cannot retrieve wrapper device\n");
	return ret;
	}
	gi2c->wrapper_dev = &wrapper_pdev->dev;
	gi2c->i2c_rsc.wrapper_dev = &wrapper_pdev->dev;
	ret = geni_se_resources_init(&gi2c->i2c_rsc, I2C_CORE2X_VOTE,
	(DEFAULT_SE_CLK * DEFAULT_BUS_WIDTH));
	if (ret) {
	dev_err(gi2c->dev, "geni_se_resources_init\n");
	return ret;
	}

	gi2c->i2c_rsc.se_clk = devm_clk_get(&pdev->dev, "se-clk");
	if (IS_ERR(gi2c->i2c_rsc.se_clk)) {
	ret = PTR_ERR(gi2c->i2c_rsc.se_clk);
	dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret);
	return ret;
	}

	gi2c->i2c_rsc.m_ahb_clk = devm_clk_get(&pdev->dev, "m-ahb");
	if (IS_ERR(gi2c->i2c_rsc.m_ahb_clk)) {
	ret = PTR_ERR(gi2c->i2c_rsc.m_ahb_clk);
	dev_err(&pdev->dev, "Err getting M AHB clk %d\n", ret);
	return ret;
	}

	gi2c->i2c_rsc.s_ahb_clk = devm_clk_get(&pdev->dev, "s-ahb");
	if (IS_ERR(gi2c->i2c_rsc.s_ahb_clk)) {
	ret = PTR_ERR(gi2c->i2c_rsc.s_ahb_clk);
	dev_err(&pdev->dev, "Err getting S AHB clk %d\n", ret);
	return ret;
	}

	gi2c->base = devm_ioremap_resource(gi2c->dev, res);
	if (IS_ERR(gi2c->base))
	return PTR_ERR(gi2c->base);

	gi2c->i2c_rsc.geni_pinctrl = devm_pinctrl_get(&pdev->dev);
	if (IS_ERR_OR_NULL(gi2c->i2c_rsc.geni_pinctrl)) {
	dev_err(&pdev->dev, "No pinctrl config specified\n");
	ret = PTR_ERR(gi2c->i2c_rsc.geni_pinctrl);
	return ret;
	}
	gi2c->i2c_rsc.geni_gpio_active =
	pinctrl_lookup_state(gi2c->i2c_rsc.geni_pinctrl,
	PINCTRL_DEFAULT);
	if (IS_ERR_OR_NULL(gi2c->i2c_rsc.geni_gpio_active)) {
	dev_err(&pdev->dev, "No default config specified\n");
	ret = PTR_ERR(gi2c->i2c_rsc.geni_gpio_active);
	return ret;
	}
	gi2c->i2c_rsc.geni_gpio_sleep =
	pinctrl_lookup_state(gi2c->i2c_rsc.geni_pinctrl,
	PINCTRL_SLEEP);
	if (IS_ERR_OR_NULL(gi2c->i2c_rsc.geni_gpio_sleep)) {
	dev_err(&pdev->dev, "No sleep config specified\n");
	ret = PTR_ERR(gi2c->i2c_rsc.geni_gpio_sleep);
	return ret;
	}

	gi2c->irq = platform_get_irq(pdev, 0);
	if (gi2c->irq < 0) {
	dev_err(gi2c->dev, "IRQ error for i2c-geni\n");
	return gi2c->irq;
	}

	gi2c->adap.algo = &geni_i2c_algo;
	init_completion(&gi2c->xfer);
	platform_set_drvdata(pdev, gi2c);
	ret = devm_request_irq(gi2c->dev, gi2c->irq, geni_i2c_irq,
	IRQF_TRIGGER_HIGH, "i2c_geni", gi2c);
	if (ret) {
	dev_err(gi2c->dev, "Request_irq failed:%d: err:%d\n",
	gi2c->irq, ret);
	return ret;
	}
	disable_irq(gi2c->irq);
	i2c_set_adapdata(&gi2c->adap, gi2c);
	gi2c->adap.dev.parent = gi2c->dev;
	gi2c->adap.dev.of_node = pdev->dev.of_node;

	strlcpy(gi2c->adap.name, "Geni-I2C", sizeof(gi2c->adap.name));

	pm_runtime_set_suspended(gi2c->dev);
	pm_runtime_enable(gi2c->dev);
	i2c_add_adapter(&gi2c->adap);

	return 0;
	}

	static int geni_i2c_remove(struct platform_device *pdev)
	{
	struct geni_i2c_dev *gi2c = platform_get_drvdata(pdev);

	pm_runtime_disable(gi2c->dev);
	i2c_del_adapter(&gi2c->adap);
	return 0;
	}

	static int geni_i2c_resume_noirq(struct device *device)
	{
	return 0;
	}

	#ifdef CONFIG_PM
	static int geni_i2c_runtime_suspend(struct device *dev)
	{
	struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);

	disable_irq(gi2c->irq);
	se_geni_resources_off(&gi2c->i2c_rsc);
	return 0;
	}

	static int geni_i2c_runtime_resume(struct device *dev)
	{
	int ret;
	struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);

	ret = se_geni_resources_on(&gi2c->i2c_rsc);
	if (ret)
	return ret;

	if (unlikely(!gi2c->tx_wm)) {
	int gi2c_tx_depth = get_tx_fifo_depth(gi2c->base);

	gi2c->tx_wm = gi2c_tx_depth - 1;
	geni_se_init(gi2c->base, gi2c->tx_wm, gi2c_tx_depth);
	geni_se_select_mode(gi2c->base, FIFO_MODE);
	se_config_packing(gi2c->base, 8, 4, true);
	}
	enable_irq(gi2c->irq);
	return 0;
	}

	static int geni_i2c_suspend_noirq(struct device *device)
	{
	if (!pm_runtime_status_suspended(device))
	return -EBUSY;
	return 0;
	}
	#else
	static int geni_i2c_runtime_suspend(struct device *dev)
	{
	return 0;
	}

	static int geni_i2c_runtime_resume(struct device *dev)
	{
	return 0;
	}

	static int geni_i2c_suspend_noirq(struct device *device)
	{
	return 0;
	}
	#endif

	static const struct dev_pm_ops geni_i2c_pm_ops = {
	.suspend_noirq = geni_i2c_suspend_noirq,
	.resume_noirq = geni_i2c_resume_noirq,
	.runtime_suspend = geni_i2c_runtime_suspend,
	.runtime_resume = geni_i2c_runtime_resume,
	};

	static const struct of_device_id geni_i2c_dt_match[] = {
	{ .compatible = "qcom,i2c-geni" },
	{}
	};
	MODULE_DEVICE_TABLE(of, geni_i2c_dt_match);

	static struct platform_driver geni_i2c_driver = {
	.probe = geni_i2c_probe,
	.remove = geni_i2c_remove,
	.driver = {
	.name = "i2c_geni",
	.pm = &geni_i2c_pm_ops,
	.of_match_table = geni_i2c_dt_match,
	},
	};

	module_platform_driver(geni_i2c_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:i2c_geni");