drivers/i2c/rk_i2c.c - filogic/uboot - Gitiles

 /*
  * (C) Copyright 2015 Google, Inc
  *
  * (C) Copyright 2008-2014 Rockchip Electronics
  * Peter, Software Engineering, <superpeter.cai@gmail.com>.
  *
  * SPDX-License-Identifier:     GPL-2.0+
  */

 #include <common.h>
 #include <clk.h>
 #include <dm.h>
 #include <errno.h>
 #include <i2c.h>
 #include <asm/io.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/i2c.h>
 #include <asm/arch/periph.h>
 #include <dm/pinctrl.h>
 #include <linux/sizes.h>

 DECLARE_GLOBAL_DATA_PTR;

 /* i2c timerout */
 #define I2C_TIMEOUT_MS		100
 #define I2C_RETRY_COUNT		3

 /* rk i2c fifo max transfer bytes */
 #define RK_I2C_FIFO_SIZE	32

 struct rk_i2c {
 	struct clk clk;
 	struct i2c_regs *regs;
 	unsigned int speed;
 };

 static inline void rk_i2c_get_div(int div, int *divh, int *divl)
 {
 	*divl = div / 2;
 	if (div % 2 == 0)
 		*divh = div / 2;
 	else
 		*divh = DIV_ROUND_UP(div, 2);
 }

 /*
  * SCL Divisor = 8 * (CLKDIVL+1 + CLKDIVH+1)
  * SCL = PCLK / SCLK Divisor
  * i2c_rate = PCLK
  */
 static void rk_i2c_set_clk(struct rk_i2c *i2c, uint32_t scl_rate)
 {
 	uint32_t i2c_rate;
 	int div, divl, divh;

 	/* First get i2c rate from pclk */
 	i2c_rate = clk_get_rate(&i2c->clk);

 	div = DIV_ROUND_UP(i2c_rate, scl_rate * 8) - 2;
 	divh = 0;
 	divl = 0;
 	if (div >= 0)
 		rk_i2c_get_div(div, &divh, &divl);
 	writel(I2C_CLKDIV_VAL(divl, divh), &i2c->regs->clkdiv);

 	debug("rk_i2c_set_clk: i2c rate = %d, scl rate = %d\n", i2c_rate,
 	      scl_rate);
 	debug("set i2c clk div = %d, divh = %d, divl = %d\n", div, divh, divl);
 	debug("set clk(I2C_CLKDIV: 0x%08x)\n", readl(&i2c->regs->clkdiv));
 }

 static void rk_i2c_show_regs(struct i2c_regs *regs)
 {
 #ifdef DEBUG
 	uint i;

 	debug("i2c_con: 0x%08x\n", readl(&regs->con));
 	debug("i2c_clkdiv: 0x%08x\n", readl(&regs->clkdiv));
 	debug("i2c_mrxaddr: 0x%08x\n", readl(&regs->mrxaddr));
 	debug("i2c_mrxraddR: 0x%08x\n", readl(&regs->mrxraddr));
 	debug("i2c_mtxcnt: 0x%08x\n", readl(&regs->mtxcnt));
 	debug("i2c_mrxcnt: 0x%08x\n", readl(&regs->mrxcnt));
 	debug("i2c_ien: 0x%08x\n", readl(&regs->ien));
 	debug("i2c_ipd: 0x%08x\n", readl(&regs->ipd));
 	debug("i2c_fcnt: 0x%08x\n", readl(&regs->fcnt));
 	for (i = 0; i < 8; i++)
 		debug("i2c_txdata%d: 0x%08x\n", i, readl(&regs->txdata[i]));
 	for (i = 0; i < 8; i++)
 		debug("i2c_rxdata%d: 0x%08x\n", i, readl(&regs->rxdata[i]));
 #endif
 }

 static int rk_i2c_send_start_bit(struct rk_i2c *i2c)
 {
 	struct i2c_regs *regs = i2c->regs;
 	ulong start;

 	debug("I2c Send Start bit.\n");
 	writel(I2C_IPD_ALL_CLEAN, &regs->ipd);

 	writel(I2C_CON_EN | I2C_CON_START, &regs->con);
 	writel(I2C_STARTIEN, &regs->ien);

 	start = get_timer(0);
 	while (1) {
 		if (readl(&regs->ipd) & I2C_STARTIPD) {
 			writel(I2C_STARTIPD, &regs->ipd);
 			break;
 		}
 		if (get_timer(start) > I2C_TIMEOUT_MS) {
 			debug("I2C Send Start Bit Timeout\n");
 			rk_i2c_show_regs(regs);
 			return -ETIMEDOUT;
 		}
 		udelay(1);
 	}

 	return 0;
 }

 static int rk_i2c_send_stop_bit(struct rk_i2c *i2c)
 {
 	struct i2c_regs *regs = i2c->regs;
 	ulong start;

 	debug("I2c Send Stop bit.\n");
 	writel(I2C_IPD_ALL_CLEAN, &regs->ipd);

 	writel(I2C_CON_EN | I2C_CON_STOP, &regs->con);
 	writel(I2C_CON_STOP, &regs->ien);

 	start = get_timer(0);
 	while (1) {
 		if (readl(&regs->ipd) & I2C_STOPIPD) {
 			writel(I2C_STOPIPD, &regs->ipd);
 			break;
 		}
 		if (get_timer(start) > I2C_TIMEOUT_MS) {
 			debug("I2C Send Start Bit Timeout\n");
 			rk_i2c_show_regs(regs);
 			return -ETIMEDOUT;
 		}
 		udelay(1);
 	}

 	return 0;
 }

 static inline void rk_i2c_disable(struct rk_i2c *i2c)
 {
 	writel(0, &i2c->regs->con);
 }

 static int rk_i2c_read(struct rk_i2c *i2c, uchar chip, uint reg, uint r_len,
 		       uchar *buf, uint b_len)
 {
 	struct i2c_regs *regs = i2c->regs;
 	uchar *pbuf = buf;
 	uint bytes_remain_len = b_len;
 	uint bytes_xferred = 0;
 	uint words_xferred = 0;
 	ulong start;
 	uint con = 0;
 	uint rxdata;
 	uint i, j;
 	int err;
 	bool snd_chunk = false;

 	debug("rk_i2c_read: chip = %d, reg = %d, r_len = %d, b_len = %d\n",
 	      chip, reg, r_len, b_len);

 	err = rk_i2c_send_start_bit(i2c);
 	if (err)
 		return err;

 	writel(I2C_MRXADDR_SET(1, chip << 1 | 1), &regs->mrxaddr);
 	if (r_len == 0) {
 		writel(0, &regs->mrxraddr);
 	} else if (r_len < 4) {
 		writel(I2C_MRXRADDR_SET(r_len, reg), &regs->mrxraddr);
 	} else {
 		debug("I2C Read: addr len %d not supported\n", r_len);
 		return -EIO;
 	}

 	while (bytes_remain_len) {
 		if (bytes_remain_len > RK_I2C_FIFO_SIZE) {
 			con = I2C_CON_EN;
 			bytes_xferred = 32;
 		} else {
 			/*
 			 * The hw can read up to 32 bytes at a time. If we need
 			 * more than one chunk, send an ACK after the last byte.
 			 */
 			con = I2C_CON_EN | I2C_CON_LASTACK;
 			bytes_xferred = bytes_remain_len;
 		}
 		words_xferred = DIV_ROUND_UP(bytes_xferred, 4);

 		/*
 		 * make sure we are in plain RX mode if we read a second chunk
 		 */
 		if (snd_chunk)
 			con |= I2C_CON_MOD(I2C_MODE_RX);
 		else
 			con |= I2C_CON_MOD(I2C_MODE_TRX);

 		writel(con, &regs->con);
 		writel(bytes_xferred, &regs->mrxcnt);
 		writel(I2C_MBRFIEN | I2C_NAKRCVIEN, &regs->ien);

 		start = get_timer(0);
 		while (1) {
 			if (readl(&regs->ipd) & I2C_NAKRCVIPD) {
 				writel(I2C_NAKRCVIPD, &regs->ipd);
 				err = -EREMOTEIO;
 			}
 			if (readl(&regs->ipd) & I2C_MBRFIPD) {
 				writel(I2C_MBRFIPD, &regs->ipd);
 				break;
 			}
 			if (get_timer(start) > I2C_TIMEOUT_MS) {
 				debug("I2C Read Data Timeout\n");
 				err =  -ETIMEDOUT;
 				rk_i2c_show_regs(regs);
 				goto i2c_exit;
 			}
 			udelay(1);
 		}

 		for (i = 0; i < words_xferred; i++) {
 			rxdata = readl(&regs->rxdata[i]);
 			debug("I2c Read RXDATA[%d] = 0x%x\n", i, rxdata);
 			for (j = 0; j < 4; j++) {
 				if ((i * 4 + j) == bytes_xferred)
 					break;
 				*pbuf++ = (rxdata >> (j * 8)) & 0xff;
 			}
 		}

 		bytes_remain_len -= bytes_xferred;
 		snd_chunk = true;
 		debug("I2C Read bytes_remain_len %d\n", bytes_remain_len);
 	}

 i2c_exit:
 	rk_i2c_send_stop_bit(i2c);
 	rk_i2c_disable(i2c);

 	return err;
 }

 static int rk_i2c_write(struct rk_i2c *i2c, uchar chip, uint reg, uint r_len,
 			uchar *buf, uint b_len)
 {
 	struct i2c_regs *regs = i2c->regs;
 	int err;
 	uchar *pbuf = buf;
 	uint bytes_remain_len = b_len + r_len + 1;
 	uint bytes_xferred = 0;
 	uint words_xferred = 0;
 	ulong start;
 	uint txdata;
 	uint i, j;

 	debug("rk_i2c_write: chip = %d, reg = %d, r_len = %d, b_len = %d\n",
 	      chip, reg, r_len, b_len);
 	err = rk_i2c_send_start_bit(i2c);
 	if (err)
 		return err;

 	while (bytes_remain_len) {
 		if (bytes_remain_len > RK_I2C_FIFO_SIZE)
 			bytes_xferred = RK_I2C_FIFO_SIZE;
 		else
 			bytes_xferred = bytes_remain_len;
 		words_xferred = DIV_ROUND_UP(bytes_xferred, 4);

 		for (i = 0; i < words_xferred; i++) {
 			txdata = 0;
 			for (j = 0; j < 4; j++) {
 				if ((i * 4 + j) == bytes_xferred)
 					break;

 				if (i == 0 && j == 0 && pbuf == buf) {
 					txdata |= (chip << 1);
 				} else if (i == 0 && j <= r_len && pbuf == buf) {
 					txdata |= (reg &
 						(0xff << ((j - 1) * 8))) << 8;
 				} else {
 					txdata |= (*pbuf++)<<(j * 8);
 				}
 			}
 			writel(txdata, &regs->txdata[i]);
 			debug("I2c Write TXDATA[%d] = 0x%08x\n", i, txdata);
 		}

 		writel(I2C_CON_EN | I2C_CON_MOD(I2C_MODE_TX), &regs->con);
 		writel(bytes_xferred, &regs->mtxcnt);
 		writel(I2C_MBTFIEN | I2C_NAKRCVIEN, &regs->ien);

 		start = get_timer(0);
 		while (1) {
 			if (readl(&regs->ipd) & I2C_NAKRCVIPD) {
 				writel(I2C_NAKRCVIPD, &regs->ipd);
 				err = -EREMOTEIO;
 			}
 			if (readl(&regs->ipd) & I2C_MBTFIPD) {
 				writel(I2C_MBTFIPD, &regs->ipd);
 				break;
 			}
 			if (get_timer(start) > I2C_TIMEOUT_MS) {
 				debug("I2C Write Data Timeout\n");
 				err =  -ETIMEDOUT;
 				rk_i2c_show_regs(regs);
 				goto i2c_exit;
 			}
 			udelay(1);
 		}

 		bytes_remain_len -= bytes_xferred;
 		debug("I2C Write bytes_remain_len %d\n", bytes_remain_len);
 	}

 i2c_exit:
 	rk_i2c_send_stop_bit(i2c);
 	rk_i2c_disable(i2c);

 	return err;
 }

 static int rockchip_i2c_xfer(struct udevice *bus, struct i2c_msg *msg,
 			     int nmsgs)
 {
 	struct rk_i2c *i2c = dev_get_priv(bus);
 	int ret;

 	debug("i2c_xfer: %d messages\n", nmsgs);
 	for (; nmsgs > 0; nmsgs--, msg++) {
 		debug("i2c_xfer: chip=0x%x, len=0x%x\n", msg->addr, msg->len);
 		if (msg->flags & I2C_M_RD) {
 			ret = rk_i2c_read(i2c, msg->addr, 0, 0, msg->buf,
 					  msg->len);
 		} else {
 			ret = rk_i2c_write(i2c, msg->addr, 0, 0, msg->buf,
 					   msg->len);
 		}
 		if (ret) {
 			debug("i2c_write: error sending\n");
 			return -EREMOTEIO;
 		}
 	}

 	return 0;
 }

 int rockchip_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
 {
 	struct rk_i2c *i2c = dev_get_priv(bus);

 	rk_i2c_set_clk(i2c, speed);

 	return 0;
 }

 static int rockchip_i2c_ofdata_to_platdata(struct udevice *bus)
 {
 	struct rk_i2c *priv = dev_get_priv(bus);
 	int ret;

 	ret = clk_get_by_index(bus, 0, &priv->clk);
 	if (ret < 0) {
 		debug("%s: Could not get clock for %s: %d\n", __func__,
 		      bus->name, ret);
 		return ret;
 	}

 	return 0;
 }

 static int rockchip_i2c_probe(struct udevice *bus)
 {
 	struct rk_i2c *priv = dev_get_priv(bus);

 	priv->regs = (void *)devfdt_get_addr(bus);

 	return 0;
 }

 static const struct dm_i2c_ops rockchip_i2c_ops = {
 	.xfer		= rockchip_i2c_xfer,
 	.set_bus_speed	= rockchip_i2c_set_bus_speed,
 };

 static const struct udevice_id rockchip_i2c_ids[] = {
 	{ .compatible = "rockchip,rk3066-i2c" },
 	{ .compatible = "rockchip,rk3188-i2c" },
 	{ .compatible = "rockchip,rk3288-i2c" },
 	{ .compatible = "rockchip,rk3399-i2c" },
 	{ }
 };

 U_BOOT_DRIVER(i2c_rockchip) = {
 	.name	= "i2c_rockchip",
 	.id	= UCLASS_I2C,
 	.of_match = rockchip_i2c_ids,
 	.ofdata_to_platdata = rockchip_i2c_ofdata_to_platdata,
 	.probe	= rockchip_i2c_probe,
 	.priv_auto_alloc_size = sizeof(struct rk_i2c),
 	.ops	= &rockchip_i2c_ops,
 };
	/*
	* (C) Copyright 2015 Google, Inc
	*
	* (C) Copyright 2008-2014 Rockchip Electronics
	* Peter, Software Engineering, <superpeter.cai@gmail.com>.
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <clk.h>
	#include <dm.h>
	#include <errno.h>
	#include <i2c.h>
	#include <asm/io.h>
	#include <asm/arch/clock.h>
	#include <asm/arch/i2c.h>
	#include <asm/arch/periph.h>
	#include <dm/pinctrl.h>
	#include <linux/sizes.h>

	DECLARE_GLOBAL_DATA_PTR;

	/* i2c timerout */
	#define I2C_TIMEOUT_MS 100
	#define I2C_RETRY_COUNT 3

	/* rk i2c fifo max transfer bytes */
	#define RK_I2C_FIFO_SIZE 32

	struct rk_i2c {
	struct clk clk;
	struct i2c_regs *regs;
	unsigned int speed;
	};

	static inline void rk_i2c_get_div(int div, int divh, int divl)
	{
	*divl = div / 2;
	if (div % 2 == 0)
	*divh = div / 2;
	else
	*divh = DIV_ROUND_UP(div, 2);
	}

	/*
	* SCL Divisor = 8 * (CLKDIVL+1 + CLKDIVH+1)
	* SCL = PCLK / SCLK Divisor
	* i2c_rate = PCLK
	*/
	static void rk_i2c_set_clk(struct rk_i2c *i2c, uint32_t scl_rate)
	{
	uint32_t i2c_rate;
	int div, divl, divh;

	/* First get i2c rate from pclk */
	i2c_rate = clk_get_rate(&i2c->clk);

	div = DIV_ROUND_UP(i2c_rate, scl_rate * 8) - 2;
	divh = 0;
	divl = 0;
	if (div >= 0)
	rk_i2c_get_div(div, &divh, &divl);
	writel(I2C_CLKDIV_VAL(divl, divh), &i2c->regs->clkdiv);

	debug("rk_i2c_set_clk: i2c rate = %d, scl rate = %d\n", i2c_rate,
	scl_rate);
	debug("set i2c clk div = %d, divh = %d, divl = %d\n", div, divh, divl);
	debug("set clk(I2C_CLKDIV: 0x%08x)\n", readl(&i2c->regs->clkdiv));
	}

	static void rk_i2c_show_regs(struct i2c_regs *regs)
	{
	#ifdef DEBUG
	uint i;

	debug("i2c_con: 0x%08x\n", readl(&regs->con));
	debug("i2c_clkdiv: 0x%08x\n", readl(&regs->clkdiv));
	debug("i2c_mrxaddr: 0x%08x\n", readl(&regs->mrxaddr));
	debug("i2c_mrxraddR: 0x%08x\n", readl(&regs->mrxraddr));
	debug("i2c_mtxcnt: 0x%08x\n", readl(&regs->mtxcnt));
	debug("i2c_mrxcnt: 0x%08x\n", readl(&regs->mrxcnt));
	debug("i2c_ien: 0x%08x\n", readl(&regs->ien));
	debug("i2c_ipd: 0x%08x\n", readl(&regs->ipd));
	debug("i2c_fcnt: 0x%08x\n", readl(&regs->fcnt));
	for (i = 0; i < 8; i++)
	debug("i2c_txdata%d: 0x%08x\n", i, readl(&regs->txdata[i]));
	for (i = 0; i < 8; i++)
	debug("i2c_rxdata%d: 0x%08x\n", i, readl(&regs->rxdata[i]));
	#endif
	}

	static int rk_i2c_send_start_bit(struct rk_i2c *i2c)
	{
	struct i2c_regs *regs = i2c->regs;
	ulong start;

	debug("I2c Send Start bit.\n");
	writel(I2C_IPD_ALL_CLEAN, &regs->ipd);

	writel(I2C_CON_EN \| I2C_CON_START, &regs->con);
	writel(I2C_STARTIEN, &regs->ien);

	start = get_timer(0);
	while (1) {
	if (readl(&regs->ipd) & I2C_STARTIPD) {
	writel(I2C_STARTIPD, &regs->ipd);
	break;
	}
	if (get_timer(start) > I2C_TIMEOUT_MS) {
	debug("I2C Send Start Bit Timeout\n");
	rk_i2c_show_regs(regs);
	return -ETIMEDOUT;
	}
	udelay(1);
	}

	return 0;
	}

	static int rk_i2c_send_stop_bit(struct rk_i2c *i2c)
	{
	struct i2c_regs *regs = i2c->regs;
	ulong start;

	debug("I2c Send Stop bit.\n");
	writel(I2C_IPD_ALL_CLEAN, &regs->ipd);

	writel(I2C_CON_EN \| I2C_CON_STOP, &regs->con);
	writel(I2C_CON_STOP, &regs->ien);

	start = get_timer(0);
	while (1) {
	if (readl(&regs->ipd) & I2C_STOPIPD) {
	writel(I2C_STOPIPD, &regs->ipd);
	break;
	}
	if (get_timer(start) > I2C_TIMEOUT_MS) {
	debug("I2C Send Start Bit Timeout\n");
	rk_i2c_show_regs(regs);
	return -ETIMEDOUT;
	}
	udelay(1);
	}

	return 0;
	}

	static inline void rk_i2c_disable(struct rk_i2c *i2c)
	{
	writel(0, &i2c->regs->con);
	}

	static int rk_i2c_read(struct rk_i2c *i2c, uchar chip, uint reg, uint r_len,
	uchar *buf, uint b_len)
	{
	struct i2c_regs *regs = i2c->regs;
	uchar *pbuf = buf;
	uint bytes_remain_len = b_len;
	uint bytes_xferred = 0;
	uint words_xferred = 0;
	ulong start;
	uint con = 0;
	uint rxdata;
	uint i, j;
	int err;
	bool snd_chunk = false;

	debug("rk_i2c_read: chip = %d, reg = %d, r_len = %d, b_len = %d\n",
	chip, reg, r_len, b_len);

	err = rk_i2c_send_start_bit(i2c);
	if (err)
	return err;

	writel(I2C_MRXADDR_SET(1, chip << 1 \| 1), &regs->mrxaddr);
	if (r_len == 0) {
	writel(0, &regs->mrxraddr);
	} else if (r_len < 4) {
	writel(I2C_MRXRADDR_SET(r_len, reg), &regs->mrxraddr);
	} else {
	debug("I2C Read: addr len %d not supported\n", r_len);
	return -EIO;
	}

	while (bytes_remain_len) {
	if (bytes_remain_len > RK_I2C_FIFO_SIZE) {
	con = I2C_CON_EN;
	bytes_xferred = 32;
	} else {
	/*
	* The hw can read up to 32 bytes at a time. If we need
	* more than one chunk, send an ACK after the last byte.
	*/
	con = I2C_CON_EN \| I2C_CON_LASTACK;
	bytes_xferred = bytes_remain_len;
	}
	words_xferred = DIV_ROUND_UP(bytes_xferred, 4);

	/*
	* make sure we are in plain RX mode if we read a second chunk
	*/
	if (snd_chunk)
	con \|= I2C_CON_MOD(I2C_MODE_RX);
	else
	con \|= I2C_CON_MOD(I2C_MODE_TRX);

	writel(con, &regs->con);
	writel(bytes_xferred, &regs->mrxcnt);
	writel(I2C_MBRFIEN \| I2C_NAKRCVIEN, &regs->ien);

	start = get_timer(0);
	while (1) {
	if (readl(&regs->ipd) & I2C_NAKRCVIPD) {
	writel(I2C_NAKRCVIPD, &regs->ipd);
	err = -EREMOTEIO;
	}
	if (readl(&regs->ipd) & I2C_MBRFIPD) {
	writel(I2C_MBRFIPD, &regs->ipd);
	break;
	}
	if (get_timer(start) > I2C_TIMEOUT_MS) {
	debug("I2C Read Data Timeout\n");
	err = -ETIMEDOUT;
	rk_i2c_show_regs(regs);
	goto i2c_exit;
	}
	udelay(1);
	}

	for (i = 0; i < words_xferred; i++) {
	rxdata = readl(&regs->rxdata[i]);
	debug("I2c Read RXDATA[%d] = 0x%x\n", i, rxdata);
	for (j = 0; j < 4; j++) {
	if ((i * 4 + j) == bytes_xferred)
	break;
	pbuf++ = (rxdata >> (j 8)) & 0xff;
	}
	}

	bytes_remain_len -= bytes_xferred;
	snd_chunk = true;
	debug("I2C Read bytes_remain_len %d\n", bytes_remain_len);
	}

	i2c_exit:
	rk_i2c_send_stop_bit(i2c);
	rk_i2c_disable(i2c);

	return err;
	}

	static int rk_i2c_write(struct rk_i2c *i2c, uchar chip, uint reg, uint r_len,
	uchar *buf, uint b_len)
	{
	struct i2c_regs *regs = i2c->regs;
	int err;
	uchar *pbuf = buf;
	uint bytes_remain_len = b_len + r_len + 1;
	uint bytes_xferred = 0;
	uint words_xferred = 0;
	ulong start;
	uint txdata;
	uint i, j;

	debug("rk_i2c_write: chip = %d, reg = %d, r_len = %d, b_len = %d\n",
	chip, reg, r_len, b_len);
	err = rk_i2c_send_start_bit(i2c);
	if (err)
	return err;

	while (bytes_remain_len) {
	if (bytes_remain_len > RK_I2C_FIFO_SIZE)
	bytes_xferred = RK_I2C_FIFO_SIZE;
	else
	bytes_xferred = bytes_remain_len;
	words_xferred = DIV_ROUND_UP(bytes_xferred, 4);

	for (i = 0; i < words_xferred; i++) {
	txdata = 0;
	for (j = 0; j < 4; j++) {
	if ((i * 4 + j) == bytes_xferred)
	break;

	if (i == 0 && j == 0 && pbuf == buf) {
	txdata \|= (chip << 1);
	} else if (i == 0 && j <= r_len && pbuf == buf) {
	txdata \|= (reg &
	(0xff << ((j - 1) * 8))) << 8;
	} else {
	txdata \|= (pbuf++)<<(j 8);
	}
	}
	writel(txdata, &regs->txdata[i]);
	debug("I2c Write TXDATA[%d] = 0x%08x\n", i, txdata);
	}

	writel(I2C_CON_EN \| I2C_CON_MOD(I2C_MODE_TX), &regs->con);
	writel(bytes_xferred, &regs->mtxcnt);
	writel(I2C_MBTFIEN \| I2C_NAKRCVIEN, &regs->ien);

	start = get_timer(0);
	while (1) {
	if (readl(&regs->ipd) & I2C_NAKRCVIPD) {
	writel(I2C_NAKRCVIPD, &regs->ipd);
	err = -EREMOTEIO;
	}
	if (readl(&regs->ipd) & I2C_MBTFIPD) {
	writel(I2C_MBTFIPD, &regs->ipd);
	break;
	}
	if (get_timer(start) > I2C_TIMEOUT_MS) {
	debug("I2C Write Data Timeout\n");
	err = -ETIMEDOUT;
	rk_i2c_show_regs(regs);
	goto i2c_exit;
	}
	udelay(1);
	}

	bytes_remain_len -= bytes_xferred;
	debug("I2C Write bytes_remain_len %d\n", bytes_remain_len);
	}

	i2c_exit:
	rk_i2c_send_stop_bit(i2c);
	rk_i2c_disable(i2c);

	return err;
	}

	static int rockchip_i2c_xfer(struct udevice bus, struct i2c_msg msg,
	int nmsgs)
	{
	struct rk_i2c *i2c = dev_get_priv(bus);
	int ret;

	debug("i2c_xfer: %d messages\n", nmsgs);
	for (; nmsgs > 0; nmsgs--, msg++) {
	debug("i2c_xfer: chip=0x%x, len=0x%x\n", msg->addr, msg->len);
	if (msg->flags & I2C_M_RD) {
	ret = rk_i2c_read(i2c, msg->addr, 0, 0, msg->buf,
	msg->len);
	} else {
	ret = rk_i2c_write(i2c, msg->addr, 0, 0, msg->buf,
	msg->len);
	}
	if (ret) {
	debug("i2c_write: error sending\n");
	return -EREMOTEIO;
	}
	}

	return 0;
	}

	int rockchip_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
	{
	struct rk_i2c *i2c = dev_get_priv(bus);

	rk_i2c_set_clk(i2c, speed);

	return 0;
	}

	static int rockchip_i2c_ofdata_to_platdata(struct udevice *bus)
	{
	struct rk_i2c *priv = dev_get_priv(bus);
	int ret;

	ret = clk_get_by_index(bus, 0, &priv->clk);
	if (ret < 0) {
	debug("%s: Could not get clock for %s: %d\n", __func__,
	bus->name, ret);
	return ret;
	}

	return 0;
	}

	static int rockchip_i2c_probe(struct udevice *bus)
	{
	struct rk_i2c *priv = dev_get_priv(bus);

	priv->regs = (void *)devfdt_get_addr(bus);

	return 0;
	}

	static const struct dm_i2c_ops rockchip_i2c_ops = {
	.xfer = rockchip_i2c_xfer,
	.set_bus_speed = rockchip_i2c_set_bus_speed,
	};

	static const struct udevice_id rockchip_i2c_ids[] = {
	{ .compatible = "rockchip,rk3066-i2c" },
	{ .compatible = "rockchip,rk3188-i2c" },
	{ .compatible = "rockchip,rk3288-i2c" },
	{ .compatible = "rockchip,rk3399-i2c" },
	{ }
	};

	U_BOOT_DRIVER(i2c_rockchip) = {
	.name = "i2c_rockchip",
	.id = UCLASS_I2C,
	.of_match = rockchip_i2c_ids,
	.ofdata_to_platdata = rockchip_i2c_ofdata_to_platdata,
	.probe = rockchip_i2c_probe,
	.priv_auto_alloc_size = sizeof(struct rk_i2c),
	.ops = &rockchip_i2c_ops,
	};