drivers/i2c/busses/i2c-qcom-geni.c

/*
 * 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/dma-mapping.h>
#include <linux/qcom-geni-se.h>
#include <linux/ipc_logging.h>
#include <linux/dmaengine.h>
#include <linux/msm_gpi.h>

#define SE_I2C_TX_TRANS_LEN		(0x26C)
#define SE_I2C_RX_TRANS_LEN		(0x270)
#define SE_I2C_SCL_COUNTERS		(0x278)
#define SE_GENI_IOS			(0x908)

#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_PACK_EN		(BIT(0) | BIT(1))
#define I2C_CORE2X_VOTE		(10000)
#define GP_IRQ0			0
#define GP_IRQ1			1
#define GP_IRQ2			2
#define GP_IRQ3			3
#define GP_IRQ4			4
#define GP_IRQ5			5
#define GENI_OVERRUN		6
#define GENI_ILLEGAL_CMD	7
#define GENI_ABORT_DONE		8
#define GENI_TIMEOUT		9

#define I2C_NACK		GP_IRQ1
#define I2C_BUS_PROTO		GP_IRQ3
#define I2C_ARB_LOST		GP_IRQ4
#define DM_I2C_RX_ERR		((GP_IRQ1 | GP_IRQ3 | GP_IRQ4) >> 4)

enum i2c_se_mode {
	UNINITIALIZED,
	FIFO_SE_DMA,
	GSI_ONLY,
};

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;
	void *ipcl;
	int clk_fld_idx;
	struct dma_chan *tx_c;
	struct dma_chan *rx_c;
	struct msm_gpi_tre cfg0_t;
	struct msm_gpi_tre go_t;
	struct msm_gpi_tre tx_t;
	struct msm_gpi_tre rx_t;
	dma_addr_t tx_ph;
	dma_addr_t rx_ph;
	struct msm_gpi_ctrl tx_ev;
	struct msm_gpi_ctrl rx_ev;
	struct scatterlist tx_sg[5]; /* lock, cfg0, go, TX, unlock */
	struct scatterlist rx_sg;
	int cfg_sent;
	struct dma_async_tx_descriptor *tx_desc;
	struct dma_async_tx_descriptor *rx_desc;
	struct msm_gpi_dma_async_tx_cb_param tx_cb;
	struct msm_gpi_dma_async_tx_cb_param rx_cb;
	enum i2c_se_mode se_mode;
};

struct geni_i2c_err_log {
	int err;
	const char *msg;
};

static struct geni_i2c_err_log gi2c_log[] = {
	[GP_IRQ0] = {-EINVAL, "Unknown I2C err GP_IRQ0"},
	[I2C_NACK] = {-ENOTCONN,
			"NACK: slv unresponsive, check its power/reset-ln"},
	[GP_IRQ2] = {-EINVAL, "Unknown I2C err GP IRQ2"},
	[I2C_BUS_PROTO] = {-EPROTO,
				"Bus proto err, noisy/unepxected start/stop"},
	[I2C_ARB_LOST] = {-EBUSY,
				"Bus arbitration lost, clock line undriveable"},
	[GP_IRQ5] = {-EINVAL, "Unknown I2C err GP IRQ5"},
	[GENI_OVERRUN] = {-EIO, "Cmd overrun, check GENI cmd-state machine"},
	[GENI_ILLEGAL_CMD] = {-EILSEQ,
				"Illegal cmd, check GENI cmd-state machine"},
	[GENI_ABORT_DONE] = {-ETIMEDOUT, "Abort after timeout successful"},
	[GENI_TIMEOUT] = {-ETIMEDOUT, "I2C TXN timed out"},
};

struct geni_i2c_clk_fld {
	u32	clk_freq_out;
	u8	clk_div;
	u8	t_high;
	u8	t_low;
	u8	t_cycle;
};

static struct geni_i2c_clk_fld geni_i2c_clk_map[] = {
	{KHz(100), 7, 10, 11, 26},
	{KHz(400), 2,  5, 12, 24},
	{KHz(1000), 1, 3,  9, 18},
};

static int geni_i2c_clk_map_idx(struct geni_i2c_dev *gi2c)
{
	int i;
	int ret = 0;
	bool clk_map_present = false;
	struct geni_i2c_clk_fld *itr = geni_i2c_clk_map;

	for (i = 0; i < ARRAY_SIZE(geni_i2c_clk_map); i++, itr++) {
		if (itr->clk_freq_out == gi2c->i2c_rsc.clk_freq_out) {
			clk_map_present = true;
			break;
		}
	}

	if (clk_map_present)
		gi2c->clk_fld_idx = i;
	else
		ret = -EINVAL;

	return ret;
}

static inline void qcom_geni_i2c_conf(struct geni_i2c_dev *gi2c, int dfs)
{
	struct geni_i2c_clk_fld *itr = geni_i2c_clk_map + gi2c->clk_fld_idx;

	geni_write_reg(dfs, gi2c->base, SE_GENI_CLK_SEL);

	geni_write_reg((itr->clk_div << 4) | 1, gi2c->base, GENI_SER_M_CLK_CFG);
	geni_write_reg(((itr->t_high << 20) | (itr->t_low << 10) |
			itr->t_cycle), gi2c->base, SE_I2C_SCL_COUNTERS);

	/*
	* Ensure Clk config completes before return.
	*/
	mb();
}

static void geni_i2c_err(struct geni_i2c_dev *gi2c, int err)
{
	u32 m_cmd = readl_relaxed(gi2c->base + SE_GENI_M_CMD0);
	u32 m_stat = readl_relaxed(gi2c->base + SE_GENI_M_IRQ_STATUS);
	u32 geni_s = readl_relaxed(gi2c->base + SE_GENI_STATUS);
	u32 geni_ios = readl_relaxed(gi2c->base + SE_GENI_IOS);
	u32 dma = readl_relaxed(gi2c->base + SE_GENI_DMA_MODE_EN);
	u32 rx_st, tx_st;

	if (gi2c->cur)
		GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev,
			    "len:%d, slv-addr:0x%x, RD/WR:%d\n", gi2c->cur->len,
			    gi2c->cur->addr, gi2c->cur->flags);

	if (err == I2C_NACK || err == GENI_ABORT_DONE) {
		GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev, "%s\n",
			     gi2c_log[err].msg);
		goto err_ret;
	} else {
		GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, "%s\n",
			     gi2c_log[err].msg);
	}
	if (gi2c->se_mode == GSI_ONLY)
		goto err_out;

	if (dma) {
		rx_st = readl_relaxed(gi2c->base + SE_DMA_RX_IRQ_STAT);
		tx_st = readl_relaxed(gi2c->base + SE_DMA_TX_IRQ_STAT);
	} else {
		rx_st = readl_relaxed(gi2c->base + SE_GENI_RX_FIFO_STATUS);
		tx_st = readl_relaxed(gi2c->base + SE_GENI_TX_FIFO_STATUS);
	}
	GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev,
		     "DMA:%d tx_stat:0x%x, rx_stat:0x%x, irq-stat:0x%x\n",
		     dma, tx_st, rx_st, m_stat);
err_out:
	GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev,
			     "m_cmd:0x%x, geni_status:0x%x, geni_ios:0x%x\n",
			     m_cmd, geni_s, geni_ios);
err_ret:
	gi2c->err = gi2c_log[err].err;
}

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 rx_st = readl_relaxed(gi2c->base + SE_GENI_RX_FIFO_STATUS);
	u32 dm_tx_st = readl_relaxed(gi2c->base + SE_DMA_TX_IRQ_STAT);
	u32 dm_rx_st = readl_relaxed(gi2c->base + SE_DMA_RX_IRQ_STAT);
	u32 dma = readl_relaxed(gi2c->base + SE_GENI_DMA_MODE_EN);
	struct i2c_msg *cur = gi2c->cur;

	if (!cur || (m_stat & M_CMD_FAILURE_EN) ||
		    (dm_rx_st & (DM_I2C_RX_ERR)) ||
		    (m_stat & M_CMD_ABORT_EN)) {

		if (m_stat & M_GP_IRQ_1_EN)
			geni_i2c_err(gi2c, I2C_NACK);
		if (m_stat & M_GP_IRQ_3_EN)
			geni_i2c_err(gi2c, I2C_BUS_PROTO);
		if (m_stat & M_GP_IRQ_4_EN)
			geni_i2c_err(gi2c, I2C_ARB_LOST);
		if (m_stat & M_CMD_OVERRUN_EN)
			geni_i2c_err(gi2c, GENI_OVERRUN);
		if (m_stat & M_ILLEGAL_CMD_EN)
			geni_i2c_err(gi2c, GENI_ILLEGAL_CMD);
		if (m_stat & M_CMD_ABORT_EN)
			geni_i2c_err(gi2c, GENI_ABORT_DONE);
		if (m_stat & M_GP_IRQ_0_EN)
			geni_i2c_err(gi2c, GP_IRQ0);

		if (!dma)
			writel_relaxed(0, (gi2c->base +
					   SE_GENI_TX_WATERMARK_REG));
		goto irqret;
	}

	if (dma) {
		dev_dbg(gi2c->dev, "i2c dma tx:0x%x, dma rx:0x%x\n", dm_tx_st,
			dm_rx_st);
		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_st & 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, "FIFO i:%d,read 0x%x\n",
					i, temp);
				break;
			}
		}
	} 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, "FIFO i:%d,wrote 0x%x\n", i, temp);
			if (gi2c->cur_wr == cur->len) {
				dev_dbg(gi2c->dev, "FIFO i2c bytes done writing\n");
				writel_relaxed(0,
				(gi2c->base + SE_GENI_TX_WATERMARK_REG));
				break;
			}
		}
	}
irqret:
	if (m_stat)
		writel_relaxed(m_stat, gi2c->base + SE_GENI_M_IRQ_CLEAR);

	if (dma) {
		if (dm_tx_st)
			writel_relaxed(dm_tx_st, gi2c->base +
				       SE_DMA_TX_IRQ_CLR);
		if (dm_rx_st)
			writel_relaxed(dm_rx_st, gi2c->base +
				       SE_DMA_RX_IRQ_CLR);
		/* 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)
		complete(&gi2c->xfer);
	else if ((dm_tx_st & TX_DMA_DONE) || (dm_rx_st & RX_DMA_DONE))
		complete(&gi2c->xfer);

	return IRQ_HANDLED;
}

static void gi2c_ev_cb(struct dma_chan *ch, struct msm_gpi_cb const *cb_str,
		       void *ptr)
{
	struct geni_i2c_dev *gi2c = ptr;
	u32 m_stat = cb_str->status;

	switch (cb_str->cb_event) {
	case MSM_GPI_QUP_ERROR:
	case MSM_GPI_QUP_SW_ERROR:
	case MSM_GPI_QUP_MAX_EVENT:
		/* fall through to stall impacted channel */
	case MSM_GPI_QUP_CH_ERROR:
	case MSM_GPI_QUP_PENDING_EVENT:
	case MSM_GPI_QUP_EOT_DESC_MISMATCH:
		break;
	case MSM_GPI_QUP_NOTIFY:
		if (m_stat & M_GP_IRQ_1_EN)
			geni_i2c_err(gi2c, I2C_NACK);
		if (m_stat & M_GP_IRQ_3_EN)
			geni_i2c_err(gi2c, I2C_BUS_PROTO);
		if (m_stat & M_GP_IRQ_4_EN)
			geni_i2c_err(gi2c, I2C_ARB_LOST);
		complete(&gi2c->xfer);
		break;
	default:
		break;
	}
	if (cb_str->cb_event != MSM_GPI_QUP_NOTIFY)
		GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev,
				"GSI QN err:0x%x, status:0x%x, err:%d\n",
				cb_str->error_log.error_code,
				m_stat, cb_str->cb_event);
}

static void gi2c_gsi_tx_cb(void *ptr)
{
	struct msm_gpi_dma_async_tx_cb_param *tx_cb = ptr;
	struct geni_i2c_dev *gi2c = tx_cb->userdata;

	if (!(gi2c->cur->flags & I2C_M_RD))
		complete(&gi2c->xfer);
}

static void gi2c_gsi_rx_cb(void *ptr)
{
	struct msm_gpi_dma_async_tx_cb_param *rx_cb = ptr;
	struct geni_i2c_dev *gi2c = rx_cb->userdata;

	if (gi2c->cur->flags & I2C_M_RD) {
		if (rx_cb->status & DM_I2C_RX_ERR) {
			GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev,
				    "RX TCE Unexpected Err, stat:0x%x\n",
				    rx_cb->status);
			if (rx_cb->status & GP_IRQ1)
				geni_i2c_err(gi2c, I2C_NACK);
			if (rx_cb->status & GP_IRQ3)
				geni_i2c_err(gi2c, I2C_BUS_PROTO);
			if (rx_cb->status & GP_IRQ4)
				geni_i2c_err(gi2c, I2C_ARB_LOST);
		}
		complete(&gi2c->xfer);
	}
}

static int geni_i2c_gsi_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;

	if (!gi2c->tx_c) {
		gi2c->tx_c = dma_request_slave_channel(gi2c->dev, "tx");
		if (!gi2c->tx_c) {
			GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev,
				    "tx dma req slv chan ret :%d\n", ret);
			return -EIO;
		}
		gi2c->tx_ev.init.callback = gi2c_ev_cb;
		gi2c->tx_ev.init.cb_param = gi2c;
		gi2c->tx_ev.cmd = MSM_GPI_INIT;
		gi2c->tx_c->private = &gi2c->tx_ev;
		ret = dmaengine_slave_config(gi2c->tx_c, NULL);
		if (ret) {
			GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev,
				    "tx dma slave config ret :%d\n", ret);
			return ret;
		}
	}
	if (!gi2c->rx_c) {
		gi2c->rx_c = dma_request_slave_channel(gi2c->dev, "rx");
		if (!gi2c->rx_c) {
			GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev,
				    "rx dma req slv chan ret :%d\n", ret);
			return -EIO;
		}
		gi2c->rx_ev.init.cb_param = gi2c;
		gi2c->rx_ev.init.callback = gi2c_ev_cb;
		gi2c->rx_ev.cmd = MSM_GPI_INIT;
		gi2c->rx_c->private = &gi2c->rx_ev;
		ret = dmaengine_slave_config(gi2c->rx_c, NULL);
		if (ret) {
			GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev,
				    "rx dma slave config ret :%d\n", ret);
			return ret;
		}
	}

	if (!gi2c->cfg_sent) {
		struct geni_i2c_clk_fld *itr = geni_i2c_clk_map +
							gi2c->clk_fld_idx;
		struct msm_gpi_tre *cfg0 = &gi2c->cfg0_t;

		/* config0 */
		cfg0->dword[0] = MSM_GPI_I2C_CONFIG0_TRE_DWORD0(I2C_PACK_EN,
								itr->t_cycle,
								itr->t_high,
								itr->t_low);
		cfg0->dword[1] = MSM_GPI_I2C_CONFIG0_TRE_DWORD1(0, 0);
		cfg0->dword[2] = MSM_GPI_I2C_CONFIG0_TRE_DWORD2(0,
								itr->clk_div);
		cfg0->dword[3] = MSM_GPI_I2C_CONFIG0_TRE_DWORD3(0, 0, 0, 1);

		gi2c->tx_cb.userdata = gi2c;
		gi2c->rx_cb.userdata = gi2c;
	}

	for (i = 0; i < num; i++) {
		u8 op = (msgs[i].flags & I2C_M_RD) ? 2 : 1;
		int segs = 3 - op;
		int index = 0;
		int stretch = (i < (num - 1));
		dma_cookie_t tx_cookie, rx_cookie;
		struct msm_gpi_tre *go_t = &gi2c->go_t;
		struct device *rx_dev = gi2c->rx_c->device->dev;
		struct device *tx_dev = gi2c->tx_c->device->dev;

		gi2c->cur = &msgs[i];
		if (!gi2c->cfg_sent) {
			segs++;
			sg_init_table(gi2c->tx_sg, segs);
			sg_set_buf(gi2c->tx_sg, &gi2c->cfg0_t,
						sizeof(gi2c->cfg0_t));
			gi2c->cfg_sent = 1;
			index++;
		} else {
			sg_init_table(gi2c->tx_sg, segs);
		}

		go_t->dword[0] = MSM_GPI_I2C_GO_TRE_DWORD0((stretch << 2),
							   msgs[i].addr, op);
		go_t->dword[1] = MSM_GPI_I2C_GO_TRE_DWORD1;

		if (msgs[i].flags & I2C_M_RD) {
			go_t->dword[2] = MSM_GPI_I2C_GO_TRE_DWORD2(msgs[i].len);
			go_t->dword[3] = MSM_GPI_I2C_GO_TRE_DWORD3(0, 0, 1, 0);
		} else {
			go_t->dword[2] = MSM_GPI_I2C_GO_TRE_DWORD2(0);
			go_t->dword[3] = MSM_GPI_I2C_GO_TRE_DWORD3(0, 0, 0, 1);
		}

		sg_set_buf(&gi2c->tx_sg[index++], &gi2c->go_t,
						  sizeof(gi2c->go_t));

		if (msgs[i].flags & I2C_M_RD) {
			sg_init_table(&gi2c->rx_sg, 1);
			gi2c->rx_ph = dma_map_single(rx_dev, msgs[i].buf,
						     msgs[i].len,
						     DMA_FROM_DEVICE);
			gi2c->rx_t.dword[0] =
				MSM_GPI_DMA_W_BUFFER_TRE_DWORD0(gi2c->rx_ph);
			gi2c->rx_t.dword[1] =
				MSM_GPI_DMA_W_BUFFER_TRE_DWORD1(gi2c->rx_ph);
			gi2c->rx_t.dword[2] =
				MSM_GPI_DMA_W_BUFFER_TRE_DWORD2(msgs[i].len);
			gi2c->rx_t.dword[3] =
				MSM_GPI_DMA_W_BUFFER_TRE_DWORD3(0, 1, 0, 0);

			sg_set_buf(&gi2c->rx_sg, &gi2c->rx_t,
						 sizeof(gi2c->rx_t));
			gi2c->rx_desc = dmaengine_prep_slave_sg(gi2c->rx_c,
							&gi2c->rx_sg, 1,
							DMA_DEV_TO_MEM,
							(DMA_PREP_INTERRUPT |
							 DMA_CTRL_ACK));
			if (!gi2c->rx_desc) {
				GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev,
					    "prep_slave_sg for rx failed\n");
				gi2c->err = -ENOMEM;
				return gi2c->err;
			}
			gi2c->rx_desc->callback = gi2c_gsi_rx_cb;
			gi2c->rx_desc->callback_param = &gi2c->rx_cb;

			/* Issue RX */
			rx_cookie = dmaengine_submit(gi2c->rx_desc);
			dma_async_issue_pending(gi2c->rx_c);
		} else {
			gi2c->tx_ph = dma_map_single(tx_dev, msgs[i].buf,
						     msgs[i].len,
						     DMA_TO_DEVICE);
			gi2c->tx_t.dword[0] =
				MSM_GPI_DMA_W_BUFFER_TRE_DWORD0(gi2c->tx_ph);
			gi2c->tx_t.dword[1] =
				MSM_GPI_DMA_W_BUFFER_TRE_DWORD1(gi2c->tx_ph);
			gi2c->tx_t.dword[2] =
				MSM_GPI_DMA_W_BUFFER_TRE_DWORD2(msgs[i].len);
			gi2c->tx_t.dword[3] =
				MSM_GPI_DMA_W_BUFFER_TRE_DWORD3(0, 1, 0, 0);

			sg_set_buf(&gi2c->tx_sg[index++], &gi2c->tx_t,
							  sizeof(gi2c->tx_t));
		}

		gi2c->tx_desc = dmaengine_prep_slave_sg(gi2c->tx_c, gi2c->tx_sg,
						segs, DMA_MEM_TO_DEV,
						(DMA_PREP_INTERRUPT |
						 DMA_CTRL_ACK));
		if (!gi2c->tx_desc) {
			GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev,
				    "prep_slave_sg for tx failed\n");
			gi2c->err = -ENOMEM;
			return gi2c->err;
		}
		gi2c->tx_desc->callback = gi2c_gsi_tx_cb;
		gi2c->tx_desc->callback_param = &gi2c->tx_cb;

		/* Issue TX */
		tx_cookie = dmaengine_submit(gi2c->tx_desc);
		dma_async_issue_pending(gi2c->tx_c);

		timeout = wait_for_completion_timeout(&gi2c->xfer, HZ);
		if (msgs[i].flags & I2C_M_RD)
			dma_unmap_single(rx_dev, gi2c->rx_ph, msgs[i].len,
					 DMA_FROM_DEVICE);
		else
			dma_unmap_single(tx_dev, gi2c->tx_ph, msgs[i].len,
					 DMA_TO_DEVICE);

		if (!timeout) {
			GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev,
				    "GSI Txn timed out\n");
			gi2c->err = -ETIMEDOUT;
		}
		if (gi2c->err) {
			dmaengine_terminate_all(gi2c->tx_c);
			gi2c->cfg_sent = 0;
			return gi2c->err;
		}
	}
	return gi2c->err;
}

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) {
		GENI_SE_ERR(gi2c->ipcl, true, 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;
	}
	if (gi2c->se_mode == GSI_ONLY) {
		ret = geni_i2c_gsi_xfer(adap, msgs, num);
		goto geni_i2c_txn_ret;
	}

	qcom_geni_i2c_conf(gi2c, 0);
	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;
		dma_addr_t tx_dma = 0;
		dma_addr_t rx_dma = 0;
		enum se_xfer_mode mode = FIFO_MODE;

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

		gi2c->cur = &msgs[i];
		mode = msgs[i].len > 32 ? SE_DMA : FIFO_MODE;
		ret = geni_se_select_mode(gi2c->base, mode);
		if (ret) {
			dev_err(gi2c->dev, "%s: Error mode init %d:%d:%d\n",
				__func__, mode, i, msgs[i].len);
			break;
		}
		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);
			if (mode == SE_DMA) {
				ret = geni_se_rx_dma_prep(gi2c->wrapper_dev,
							gi2c->base, msgs[i].buf,
							msgs[i].len, &rx_dma);
				if (ret) {
					mode = FIFO_MODE;
					ret = geni_se_select_mode(gi2c->base,
								  mode);
				}
			}
		} else {
			dev_dbg(gi2c->dev,
				"WRITE:n:%d,i:%d len:%d, stretch:%d, m_param:0x%x\n",
					num, i, msgs[i].len, stretch, m_param);
			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);
			if (mode == SE_DMA) {
				ret = geni_se_tx_dma_prep(gi2c->wrapper_dev,
							gi2c->base, msgs[i].buf,
							msgs[i].len, &tx_dma);
				if (ret) {
					mode = FIFO_MODE;
					ret = geni_se_select_mode(gi2c->base,
								  mode);
				}
			}
			if (mode == FIFO_MODE) /* 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) {
			geni_i2c_err(gi2c, GENI_TIMEOUT);
			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 (mode == SE_DMA) {
			if (gi2c->err) {
				if (msgs[i].flags != I2C_M_RD)
					writel_relaxed(1, gi2c->base +
							SE_DMA_TX_FSM_RST);
				else
					writel_relaxed(1, gi2c->base +
							SE_DMA_RX_FSM_RST);
				wait_for_completion_timeout(&gi2c->xfer, HZ);
			}
			geni_se_rx_dma_unprep(gi2c->wrapper_dev, rx_dma,
					      msgs[i].len);
			geni_se_tx_dma_unprep(gi2c->wrapper_dev, tx_dma,
					      msgs[i].len);
		}
		ret = gi2c->err;
		if (gi2c->err) {
			dev_err(gi2c->dev, "i2c error :%d\n", gi2c->err);
			break;
		}
	}
geni_i2c_txn_ret:
	if (ret == 0)
		ret = num;
	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;
	}

	if (of_property_read_u32(pdev->dev.of_node, "qcom,clk-freq-out",
				&gi2c->i2c_rsc.clk_freq_out)) {
		dev_info(&pdev->dev,
			"Bus frequency not specified, default to 400KHz.\n");
		gi2c->i2c_rsc.clk_freq_out = KHz(400);
	}

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

	ret = geni_i2c_clk_map_idx(gi2c);
	if (ret) {
		dev_err(gi2c->dev, "Invalid clk frequency %d KHz: %d\n",
				gi2c->i2c_rsc.clk_freq_out, ret);
		return ret;
	}

	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);

	dev_dbg(gi2c->dev, "I2C probed\n");
	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);
	if (gi2c->ipcl)
		ipc_log_context_destroy(gi2c->ipcl);
	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);

	if (gi2c->se_mode == FIFO_SE_DMA)
		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);

	if (!gi2c->ipcl) {
		char ipc_name[I2C_NAME_SIZE];

		snprintf(ipc_name, I2C_NAME_SIZE, "i2c-%d", gi2c->adap.nr);
		gi2c->ipcl = ipc_log_context_create(2, ipc_name, 0);
	}
	ret = se_geni_resources_on(&gi2c->i2c_rsc);
	if (ret)
		return ret;

	if (gi2c->se_mode == UNINITIALIZED) {
		u32 se_mode = readl_relaxed(gi2c->base +
					GENI_IF_FIFO_DISABLE_RO);

		if (se_mode) {
			gi2c->se_mode = GSI_ONLY;
			geni_se_select_mode(gi2c->base, GSI_DMA);
			GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev,
				    "i2c in GSI ONLY mode\n");
		} else {
			int gi2c_tx_depth = get_tx_fifo_depth(gi2c->base);

			gi2c->se_mode = FIFO_SE_DMA;

			gi2c->tx_wm = gi2c_tx_depth - 1;
			geni_se_init(gi2c->base, gi2c->tx_wm, gi2c_tx_depth);
			se_config_packing(gi2c->base, 8, 4, true);
			GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev,
				    "i2c fifo/se-dma mode. fifo depth:%d\n",
				    gi2c_tx_depth);
		}
	}
	if (gi2c->se_mode == FIFO_SE_DMA)
		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");