drivers/i2c/aml_i2c.c

/*
 * drivers/i2c/aml_i2c.c
 *
 * Copyright (C) 2015 Amlogic, Inc. 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 as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <i2c.h>
#include <linux/types.h>
//#include <linux/mtd/compat.h>
#include <asm-generic/errno.h>

#include <asm/arch/clock.h>
#include <asm/arch/i2c.h>
#include <asm/arch/io.h>

#include <aml_i2c.h>

#define HAS_AO_MODULE
#define AML_I2C_CTRL_CLK_DELAY_MASK    (0x3FF)
#define AML_I2C_SLAVE_ADDR_MASK        (0xFF)
#define AML_I2C_SLAVE_ADDR_MASK_7BIT   (0x7F)

#define AML_I2C_ASSERT(X)							\
do {												\
	if (unlikely(!(X))) {							\
		printf("\n");								\
		printf("CacheFiles: Assertion failed\n");	\
		BUG();										\
	}												\
} while (0)


#define AML_I2C_DBG(level,fmt,args... ) do { \
	if (g_aml_i2c_data.i2c_debug > level) 	 \
		printf(fmt,##args); 				 \
}while(0)

extern struct aml_i2c_platform g_aml_i2c_plat;
struct aml_i2c_platform *g_i2c_ports;
static unsigned char g_bAmlogicI2CInitialized = 0; //I2C initialized flag
static unsigned char g_cur_bus_num = 0;

static struct aml_i2c g_aml_i2c_data = {
	.i2c_debug     = 0,
	.cur_slave_addr= 0,
	.wait_count    = 0,
	.wait_ack_interval = 0,
	.wait_read_interval= 0,
	.wait_xfer_interval= 0,
	.master_no = 0,
	.msg_flags = 0,
	.ops       = 0,
	.master_regs = 0,
	.reg_base    = 0,
	.use_pio     = 0,
	.master_i2c_speed= 0,
};

static void aml_i2c_set_clk(struct aml_i2c *i2c)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	unsigned int i2c_clock_set;
	unsigned int sys_clk;
	volatile struct aml_i2c_reg_ctrl* ctrl;
	//have not thought about sleep mode, sleep mode is low system clock
	sys_clk = get_clk81();
	AML_I2C_DBG(1, "clk81 is 0x%x\n", sys_clk);

	i2c_clock_set = sys_clk / i2c->master_i2c_speed;

	AML_I2C_DBG(1, "i2c->master_i2c_speed is 0x%x\n", i2c->master_i2c_speed);
#if 1
	i2c_clock_set >>= 1;
	ctrl = (struct aml_i2c_reg_ctrl*)&(i2c->master_regs->i2c_ctrl);
	if (i2c_clock_set > 0xfff) i2c_clock_set = 0xfff;
	ctrl->clk_delay = i2c_clock_set & 0x3ff;
	ctrl->clk_delay_ext = i2c_clock_set >> 10;
	i2c->master_regs->i2c_slave_addr &= ~(0xfff<<16);
	i2c->master_regs->i2c_slave_addr |= (i2c_clock_set>>1)<<16;
	i2c->master_regs->i2c_slave_addr |= 1<<28;
	i2c->master_regs->i2c_slave_addr &= ~(0x3f<<8); //no filter on scl&sda
#else
	i2c_clock_set >>= 2;

	AML_I2C_DBG(1, "i2c_clock_set is 0x%x\n", i2c_clock_set);

	ctrl = (struct aml_i2c_reg_ctrl*)&(i2c->master_regs->i2c_ctrl);
	ctrl->clk_delay = i2c_clock_set & AML_I2C_CTRL_CLK_DELAY_MASK;
#endif
}

static void aml_i2c_set_platform_data(struct aml_i2c *i2c,
										struct aml_i2c_platform *plat)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	i2c->master_i2c_speed = plat->master_i2c_speed;
	i2c->wait_count = plat->wait_count;
	i2c->wait_ack_interval = plat->wait_ack_interval;
	i2c->wait_read_interval = plat->wait_read_interval;
	i2c->wait_xfer_interval = plat->wait_xfer_interval;

	if (I2C_MASTER_A == i2c->master_no) {
		i2c->master_pinmux.scl_reg = plat->master_a_pinmux.scl_reg;
		i2c->master_pinmux.scl_bit = plat->master_a_pinmux.scl_bit;
		i2c->master_pinmux.sda_reg = plat->master_a_pinmux.sda_reg;
		i2c->master_pinmux.sda_bit = plat->master_a_pinmux.sda_bit;
#ifdef CONFIG_SYS_I2C_AML_HAS_MASK
		i2c->master_pinmux.scl_mask = plat->master_a_pinmux.scl_mask;
		i2c->master_pinmux.sda_mask = plat->master_a_pinmux.sda_mask;
#endif
	}
	else if(I2C_MASTER_B == i2c->master_no){
		i2c->master_pinmux.scl_reg = plat->master_b_pinmux.scl_reg;
		i2c->master_pinmux.scl_bit = plat->master_b_pinmux.scl_bit;
		i2c->master_pinmux.sda_reg = plat->master_b_pinmux.sda_reg;
		i2c->master_pinmux.sda_bit = plat->master_b_pinmux.sda_bit;
#ifdef CONFIG_SYS_I2C_AML_HAS_MASK
		i2c->master_pinmux.scl_mask = plat->master_b_pinmux.scl_mask;
		i2c->master_pinmux.sda_mask = plat->master_b_pinmux.sda_mask;
#endif
	}
	else if(I2C_MASTER_C == i2c->master_no){
		i2c->master_pinmux.scl_reg = plat->master_c_pinmux.scl_reg;
		i2c->master_pinmux.scl_bit = plat->master_c_pinmux.scl_bit;
		i2c->master_pinmux.sda_reg = plat->master_c_pinmux.sda_reg;
		i2c->master_pinmux.sda_bit = plat->master_c_pinmux.sda_bit;
#ifdef CONFIG_SYS_I2C_AML_HAS_MASK
		i2c->master_pinmux.scl_mask = plat->master_c_pinmux.scl_mask;
		i2c->master_pinmux.sda_mask = plat->master_c_pinmux.sda_mask;
#endif
	}
	else if(I2C_MASTER_D == i2c->master_no){
		i2c->master_pinmux.scl_reg = plat->master_d_pinmux.scl_reg;
		i2c->master_pinmux.scl_bit = plat->master_d_pinmux.scl_bit;
		i2c->master_pinmux.sda_reg = plat->master_d_pinmux.sda_reg;
		i2c->master_pinmux.sda_bit = plat->master_d_pinmux.sda_bit;
#ifdef CONFIG_SYS_I2C_AML_HAS_MASK
		i2c->master_pinmux.scl_mask = plat->master_d_pinmux.scl_mask;
		i2c->master_pinmux.sda_mask = plat->master_d_pinmux.sda_mask;
#endif
	}
#ifdef HAS_AO_MODULE
	else if(I2C_MASTER_AO == i2c->master_no){
		i2c->master_pinmux.scl_reg = plat->master_ao_pinmux.scl_reg;
		i2c->master_pinmux.scl_bit = plat->master_ao_pinmux.scl_bit;
		i2c->master_pinmux.sda_reg = plat->master_ao_pinmux.sda_reg;
		i2c->master_pinmux.sda_bit = plat->master_ao_pinmux.sda_bit;
#ifdef CONFIG_SYS_I2C_AML_HAS_MASK
		i2c->master_pinmux.scl_mask = plat->master_ao_pinmux.scl_mask;
		i2c->master_pinmux.sda_mask = plat->master_ao_pinmux.sda_mask;
#endif
	}
#endif
}

static void aml_i2c_pinmux_master(struct aml_i2c *i2c)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	unsigned int scl_pinmux;
	unsigned int sda_pinmux;

	scl_pinmux = readl(i2c->master_pinmux.scl_reg);
#ifdef CONFIG_SYS_I2C_AML_HAS_MASK
	scl_pinmux &= ~i2c->master_pinmux.scl_mask;
#endif
	scl_pinmux |= i2c->master_pinmux.scl_bit;
	writel(scl_pinmux, i2c->master_pinmux.scl_reg);

	sda_pinmux = readl(i2c->master_pinmux.sda_reg);
#ifdef CONFIG_SYS_I2C_AML_HAS_MASK
	sda_pinmux &= ~i2c->master_pinmux.sda_mask;
#endif
	sda_pinmux |= i2c->master_pinmux.sda_bit;
	writel(sda_pinmux, i2c->master_pinmux.sda_reg);
}

static void aml_i2c_dbg(struct aml_i2c *i2c)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	int i;
	struct aml_i2c_reg_ctrl* ctrl;

	if (i2c->i2c_debug == 0)
		return ;

	printf( "i2c_slave_addr:  0x%x\n",
								i2c->master_regs->i2c_slave_addr);
	printf( "i2c_token_list_0:  0x%x\n",
								i2c->master_regs->i2c_token_list_0);
	printf( "i2c_token_list_1:  0x%x\n",
								i2c->master_regs->i2c_token_list_1);
	printf( "i2c_token_wdata_0:  0x%x\n",
								i2c->master_regs->i2c_token_wdata_0);
	printf( "i2c_token_wdata_1:  0x%x\n",
								i2c->master_regs->i2c_token_wdata_1);
	printf( "i2c_token_rdata_0:  0x%x\n",
								i2c->master_regs->i2c_token_rdata_0);
	printf( "i2c_token_rdata_1:  0x%x\n",
								i2c->master_regs->i2c_token_rdata_1);
	for (i=0; i<AML_I2C_MAX_TOKENS; i++)
		printf("token_tag[%d]  %d\n", i, i2c->token_tag[i]);

	ctrl = ((struct aml_i2c_reg_ctrl*)&(i2c->master_regs->i2c_ctrl));
	printf( "i2c_ctrl:  0x%x\n", i2c->master_regs->i2c_ctrl);
	printf( "ctrl.rdsda  0x%x\n", ctrl->rdsda);
	printf( "ctrl.rdscl  0x%x\n", ctrl->rdscl);
	printf( "ctrl.wrsda  0x%x\n", ctrl->wrsda);
	printf( "ctrl.wrscl  0x%x\n", ctrl->wrscl);
	printf( "ctrl.manual_en  0x%x\n", ctrl->manual_en);
	printf( "ctrl.clk_delay  0x%x\n", ctrl->clk_delay);
	printf( "ctrl.rd_data_cnt  0x%x\n", ctrl->rd_data_cnt);
	printf( "ctrl.cur_token  0x%x\n", ctrl->cur_token);
	printf( "ctrl.error  0x%x\n", ctrl->error);
	printf( "ctrl.status  0x%x\n", ctrl->status);
	printf( "ctrl.ack_ignore  0x%x\n", ctrl->ack_ignore);
	printf( "ctrl.start  0x%x\n", ctrl->start);

}

static void aml_i2c_clear_token_list(struct aml_i2c *i2c)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	i2c->master_regs->i2c_token_list_0 = 0;
	i2c->master_regs->i2c_token_list_1 = 0;
	memset(i2c->token_tag, TOKEN_END, AML_I2C_MAX_TOKENS);
}

static void aml_i2c_set_token_list(struct aml_i2c *i2c)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	int i;
	unsigned int token_reg=0;

	for (i=0; i<AML_I2C_MAX_TOKENS; i++)
		token_reg |= i2c->token_tag[i]<<(i*4);

	i2c->master_regs->i2c_token_list_0=token_reg;
}

static void aml_i2c_hw_init(struct aml_i2c *i2c, unsigned int use_pio)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	struct aml_i2c_reg_ctrl* ctrl;

	aml_i2c_set_clk(i2c);

	/*manual mode*/
	if (use_pio) {
		ctrl = (struct aml_i2c_reg_ctrl*)&(i2c->master_regs->i2c_ctrl);
		ctrl->manual_en = 1;
	}
}

static int aml_i2c_check_error(struct aml_i2c *i2c)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	struct aml_i2c_reg_ctrl* ctrl;
	ctrl = (struct aml_i2c_reg_ctrl*)&(i2c->master_regs->i2c_ctrl);

	if (ctrl->error)
	{
		//printf( "ctrl.cur_token  0x%x\n", ctrl->cur_token);
		return -EIO;
	}
	else
		return 0;
}

/*poll status*/
static int aml_i2c_wait_ack(struct aml_i2c *i2c)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	int i;
	struct aml_i2c_reg_ctrl* ctrl;

	for (i=0; i<i2c->wait_count; i++) {
		udelay(i2c->wait_ack_interval);
		ctrl = (struct aml_i2c_reg_ctrl*)&(i2c->master_regs->i2c_ctrl);
		if (I2C_IDLE == ctrl->status)
			return aml_i2c_check_error(i2c);
	}

	return -ETIMEDOUT;
}

static void aml_i2c_get_read_data(struct aml_i2c *i2c, unsigned char *buf,
														size_t len)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	int i;
	unsigned long rdata0 = i2c->master_regs->i2c_token_rdata_0;
	unsigned long rdata1 = i2c->master_regs->i2c_token_rdata_1;

	for (i=0; i< min_t(size_t, len, AML_I2C_MAX_TOKENS>>1); i++)
		*buf++ = (rdata0 >> (i*8)) & 0xff;

	for (; i< min_t(size_t, len, AML_I2C_MAX_TOKENS); i++)
		*buf++ = (rdata1 >> ((i - (AML_I2C_MAX_TOKENS>>1))*8)) & 0xff;
}

static void aml_i2c_fill_data(struct aml_i2c *i2c, unsigned char *buf,
							size_t len)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	int i;
	unsigned int wdata0 = 0;
	unsigned int wdata1 = 0;

	for (i=0; i< min_t(size_t, len, AML_I2C_MAX_TOKENS>>1); i++)
		wdata0 |= (*buf++) << (i*8);

	for (; i< min_t(size_t, len, AML_I2C_MAX_TOKENS); i++)
		wdata1 |= (*buf++) << ((i - (AML_I2C_MAX_TOKENS>>1))*8);

	i2c->master_regs->i2c_token_wdata_0 = wdata0;
	i2c->master_regs->i2c_token_wdata_1 = wdata1;
}

static void aml_i2c_xfer_prepare(struct aml_i2c *i2c)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	aml_i2c_pinmux_master(i2c);
	aml_i2c_set_clk(i2c);
}

static void aml_i2c_start_token_xfer(struct aml_i2c *i2c)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);

	i2c->master_regs->i2c_ctrl &= ~1;  /*clear*/
	i2c->master_regs->i2c_ctrl |= 1;   /*set*/

	udelay(i2c->wait_xfer_interval);
}

/*Amlogic I2C controller will send write data with slave addr in the token list,
    and set addr into addr reg is enough*/
static int aml_i2c_do_address(struct aml_i2c *i2c, unsigned int addr)
{
    AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);

    i2c->cur_slave_addr = addr & AML_I2C_SLAVE_ADDR_MASK_7BIT;
#if 1
    i2c->master_regs->i2c_slave_addr &=(~AML_I2C_SLAVE_ADDR_MASK);

    i2c->master_regs->i2c_slave_addr |=(i2c->cur_slave_addr<<1);
#else
	i2c->master_regs->i2c_slave_addr = i2c->cur_slave_addr<<1;
#endif
    return 0;
}

static void aml_i2c_stop(struct aml_i2c *i2c)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	// aml_i2c_clear_token_list(i2c);
	// i2c->token_tag[0]=TOKEN_STOP;
	// aml_i2c_set_token_list(i2c);
	// aml_i2c_start_token_xfer(i2c);
	// aml_i2c_wait_ack(i2c);
	struct aml_i2c_reg_ctrl* ctrl;
	ctrl = (struct aml_i2c_reg_ctrl*)&(i2c->master_regs->i2c_ctrl);
	if (!ctrl->error) {
		AML_I2C_DBG(1, "FILE1:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
		aml_i2c_clear_token_list(i2c);
		i2c->token_tag[0]=TOKEN_STOP;
		aml_i2c_set_token_list(i2c);
		aml_i2c_start_token_xfer(i2c);
		aml_i2c_wait_ack(i2c);
	}
}

static long aml_i2c_read(struct aml_i2c *i2c, unsigned char *buf,
							size_t len)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	int i;
	int ret;
	size_t rd_len;
	int tagnum=0;

	aml_i2c_clear_token_list(i2c);

	if (!(i2c->msg_flags & I2C_M_NOSTART)) {
		i2c->token_tag[tagnum++]=TOKEN_START;
		i2c->token_tag[tagnum++]=TOKEN_SLAVE_ADDR_READ;

		aml_i2c_set_token_list(i2c);
		aml_i2c_dbg(i2c);
		aml_i2c_start_token_xfer(i2c);

		udelay(i2c->wait_ack_interval);

		ret = aml_i2c_wait_ack(i2c);
		if (ret<0)
			return ret;
		aml_i2c_clear_token_list(i2c);
	}

	while (len) {
		tagnum = 0;
		rd_len = min_t(size_t, len, AML_I2C_MAX_TOKENS);
		if (rd_len == 1)
			i2c->token_tag[tagnum++]=TOKEN_DATA_LAST;
		else{
			for (i=0; i<rd_len-1; i++)
				i2c->token_tag[tagnum++]=TOKEN_DATA;
			if (len > rd_len)
				i2c->token_tag[tagnum++]=TOKEN_DATA;
			else
				i2c->token_tag[tagnum++]=TOKEN_DATA_LAST;
		}
		aml_i2c_set_token_list(i2c);
		aml_i2c_dbg(i2c);
		aml_i2c_start_token_xfer(i2c);

		udelay(i2c->wait_ack_interval);

		ret = aml_i2c_wait_ack(i2c);
		if (ret<0)
			return ret;

		aml_i2c_get_read_data(i2c, buf, rd_len);
		len -= rd_len;
		buf += rd_len;

		aml_i2c_dbg(i2c);
		udelay(i2c->wait_read_interval);
		aml_i2c_clear_token_list(i2c);
	}
	return 0;
}

static long aml_i2c_write(struct aml_i2c *i2c, unsigned char *buf,
							size_t len)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	int i;
	int ret;
	size_t wr_len;
	int tagnum=0;

	aml_i2c_clear_token_list(i2c);

	if (!(i2c->msg_flags & I2C_M_NOSTART)) {
		i2c->token_tag[tagnum++]=TOKEN_START;
		i2c->token_tag[tagnum++]=TOKEN_SLAVE_ADDR_WRITE;
	}
	while (len) {
		wr_len = min_t(size_t, len, AML_I2C_MAX_TOKENS-tagnum);
		for (i=0; i<wr_len; i++)
			i2c->token_tag[tagnum++]=TOKEN_DATA;

		aml_i2c_set_token_list(i2c);

		aml_i2c_fill_data(i2c, buf, wr_len);

		aml_i2c_dbg(i2c);
		aml_i2c_start_token_xfer(i2c);

		len -= wr_len;
		buf += wr_len;
		tagnum = 0;

		ret = aml_i2c_wait_ack(i2c);
		if (ret<0)
			return ret;

		aml_i2c_clear_token_list(i2c);
		}
	return 0;
}

static struct aml_i2c_ops g_aml_i2c_m1_ops = {
	.xfer_prepare = aml_i2c_xfer_prepare,
	.read 		  = aml_i2c_read,
	.write 		  = aml_i2c_write,
	.do_address	  = aml_i2c_do_address,
	.stop		  = aml_i2c_stop,
};

/*General i2c master transfer*/
int aml_i2c_xfer(struct i2c_msg *msgs,
							int num)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);

	if (0 == g_bAmlogicI2CInitialized) {
		return -ENXIO; //device not initialized
	}

	struct aml_i2c *i2c = &g_aml_i2c_data;
	struct i2c_msg * p=0;
	unsigned int i;
	unsigned int ret=0;

	i2c->ops->xfer_prepare(i2c);

	for (i = 0; !ret && i < num; i++) {
		p = &msgs[i];
		i2c->msg_flags = p->flags;
		ret = i2c->ops->do_address(i2c, p->addr);
		if (ret || !p->len)
		{
			continue;
		}
		if (p->flags & I2C_M_RD)
			ret = i2c->ops->read(i2c, p->buf, p->len);
		else
			ret = i2c->ops->write(i2c, p->buf, p->len);
	}

	i2c->ops->stop(i2c);


	if (p->flags & I2C_M_RD) {
		AML_I2C_DBG(0, "read ");
	}
	else {
		AML_I2C_DBG(0, "write ");
	}
	for (i=0;i<p->len;i++)
		AML_I2C_DBG(0, "%x-",*(p->buf)++);
	AML_I2C_DBG(0, "\n");

	/* Return the number of messages processed, or the error code*/
	if (ret == 0)
		return num;
	else {
		printf("[aml_i2c_xfer] error ret = %d \t", ret);
		printf("i2c master %s current slave addr is 0x%x\n",
						i2c->master_no?"a":"b", i2c->cur_slave_addr);
		return ret;
	}
}
/*General i2c master transfer 100k*/
int aml_i2c_xfer_slow(struct i2c_msg *msgs,
							int num)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);
	struct aml_i2c *i2c = &g_aml_i2c_data;
	struct i2c_msg * p=0;
	unsigned int i;
	unsigned int ret=0;
	unsigned int last_speed = i2c->master_i2c_speed;


	i2c->master_i2c_speed = AML_I2C_SPPED_100K;/* change speed in i2c->lock*/
	i2c->ops->xfer_prepare(i2c);

	for (i = 0; !ret && i < num; i++) {
		p = &msgs[i];
		i2c->msg_flags = p->flags;
		//ret = i2c->ops->do_address(i2c, p->addr, p->buf, p->flags & I2C_M_RD, p->len);
		ret = i2c->ops->do_address(i2c, p->addr);
		if (ret || !p->len)
			continue;
		if (p->flags & I2C_M_RD)
			ret = i2c->ops->read(i2c, p->buf, p->len);
		else
			ret = i2c->ops->write(i2c, p->buf, p->len);
	}

	i2c->ops->stop(i2c);


	AML_I2C_DBG(0, "aml_i2c_xfer_slow");
	if (p->flags & I2C_M_RD) {
		AML_I2C_DBG(0, "read ");
	}
	else {
		AML_I2C_DBG(0, "write ");
	}
	for (i=0;i<p->len;i++)
		AML_I2C_DBG(0, "%x-",*(p->buf)++);
	AML_I2C_DBG(0, "\n");

	i2c->master_i2c_speed = last_speed;
	/* Return the number of messages processed, or the error code*/
	if (ret == 0)
		return num;
	else
		return ret;
}


/***************i2c class****************/

__attribute__((unused))  static ssize_t show_i2c_debug(void)
{
	struct aml_i2c *i2c = &g_aml_i2c_data;
	printf("i2c debug is 0x%x\n", i2c->i2c_debug);
	return 0;
}

__attribute__((unused))  static ssize_t show_i2c_info(void)
{
	struct aml_i2c *i2c = &g_aml_i2c_data;
	struct aml_i2c_reg_ctrl* ctrl;

	printf( "i2c master %s current slave addr is 0x%x\n",
						i2c->master_no?"b":"a", i2c->cur_slave_addr);
	printf( "wait ack timeout is 0x%x\n",
							i2c->wait_count * i2c->wait_ack_interval);
	printf( "master regs base is 0x%lx \n",
								(unsigned long)(i2c->master_regs));

	ctrl = ((struct aml_i2c_reg_ctrl*)&(i2c->master_regs->i2c_ctrl));
	printf( "i2c_ctrl:  0x%x\n", i2c->master_regs->i2c_ctrl);
	printf( "ctrl.rdsda  0x%x\n", ctrl->rdsda);
	printf( "ctrl.rdscl  0x%x\n", ctrl->rdscl);
	printf( "ctrl.wrsda  0x%x\n", ctrl->wrsda);
	printf( "ctrl.wrscl  0x%x\n", ctrl->wrscl);
	printf( "ctrl.manual_en  0x%x\n", ctrl->manual_en);
	printf( "ctrl.clk_delay  0x%x\n", ctrl->clk_delay);
	printf( "ctrl.rd_data_cnt  0x%x\n", ctrl->rd_data_cnt);
	printf( "ctrl.cur_token  0x%x\n", ctrl->cur_token);
	printf( "ctrl.error  0x%x\n", ctrl->error);
	printf( "ctrl.status  0x%x\n", ctrl->status);
	printf( "ctrl.ack_ignore  0x%x\n", ctrl->ack_ignore);
	printf( "ctrl.start  0x%x\n", ctrl->start);

	printf( "i2c_slave_addr:  0x%x\n",
								i2c->master_regs->i2c_slave_addr);
	printf( "i2c_token_list_0:  0x%x\n",
								i2c->master_regs->i2c_token_list_0);
	printf( "i2c_token_list_1:  0x%x\n",
								i2c->master_regs->i2c_token_list_1);
	printf( "i2c_token_wdata_0:  0x%x\n",
								i2c->master_regs->i2c_token_wdata_0);
	printf( "i2c_token_wdata_1:  0x%x\n",
								i2c->master_regs->i2c_token_wdata_1);
	printf( "i2c_token_rdata_0:  0x%x\n",
								i2c->master_regs->i2c_token_rdata_0);
	printf( "i2c_token_rdata_1:  0x%x\n",
								i2c->master_regs->i2c_token_rdata_1);

	printf( "master pinmux\n");
	printf( "scl_reg:  0x%lx\n", i2c->master_pinmux.scl_reg);
	printf( "scl_bit:  0x%x\n", i2c->master_pinmux.scl_bit);
	printf( "sda_reg:  0x%lx\n", i2c->master_pinmux.sda_reg);
	printf( "sda_bit:  0x%x\n", i2c->master_pinmux.sda_bit);

	return 0;
}

static const unsigned long g_aml_i2c_reg_start[] = {
	[0] = MESON_I2C_MASTER_AO_START,/*master a*/
	[1] = MESON_I2C_MASTER_A_START,/*master a*/
	[2] = MESON_I2C_MASTER_B_START,/*master b*/
	[3] = MESON_I2C_MASTER_C_START,/*master b*/
	[4] = MESON_I2C_MASTER_D_START,/*master b*/
	//    [2] = MESON_I2C_SLAVE_START,/*slave*/

#ifdef HAS_AO_MODULE
	[3] = MESON_I2C_MASTER_AO_START,/*master ao*/
#endif
};

int aml_i2c_init_port(struct aml_i2c_platform *plat)
{

	struct aml_i2c *i2c = &g_aml_i2c_data;

	if (plat == NULL)
	{
		printf("\nERROR! struct aml_i2c_platform *plat is a NULL pointer!\n");
		return	-1;
	}

	i2c->ops = &g_aml_i2c_m1_ops;
	i2c->master_no = plat->master_no;

	i2c->use_pio = plat->use_pio;
	AML_I2C_ASSERT((i2c->master_no >= 0) && (i2c->master_no <= 4));

	/*master a or master b*/
	if (i2c->master_no >= ARRAY_SIZE(g_aml_i2c_reg_start))
	{
		printf("\nERROR!	overflow: i2c->master_no = %d\n", i2c->master_no);
		return	-1;
	}

	printf("%s init regs for %d\n", __func__, i2c->master_no);
	i2c->master_regs = (struct aml_i2c_reg_master __iomem*)(g_aml_i2c_reg_start[i2c->master_no]);

	AML_I2C_ASSERT(i2c->master_regs);
	AML_I2C_ASSERT(plat);

	aml_i2c_set_platform_data(i2c, plat);
	aml_i2c_xfer_prepare(i2c);

	aml_i2c_hw_init(i2c , i2c->use_pio);

	g_bAmlogicI2CInitialized = 1;

	return 0;
}

int aml_i2c_init(void)
{
	return aml_i2c_init_port(g_i2c_ports + g_cur_bus_num);
}

/*****************************
 ** add by wch for cmd_i2c **
 ****************************/
/*
 * i2c read cmd
 */
int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
{
	int ret = 0;

    /*
	 * I2C data address within the chip.  This can be 1 or
	 * 2 bytes long.  Some day it might be 3 bytes long :-).
	 * here,if it has 2 bytes long at most.
	 */
	uint8_t devaddr[2];

	switch (alen)
	{
		case 0:							 //NO I2C data address within the chip.
			   puts ("'*.0' shows no i2c data or register address within the chip. \n");
			return -1;
			   break;

		case 1:							 //I2C data address:1 byte long within the chip.
			   if (addr>0xff)
			   {
					puts ("'*.1' shows i2c data or register address 1 byte long within the chip. \n");
					return -1;
			   }
			   else
					devaddr[0] = addr & 0xff;
			   break;

		case 2:
#if 0
			//I2C data address:2 bytes long within the chip.
			   if (addr>0xffff || addr<0x1ff)
			   {
					puts ("'*.2' shows i2c data or register address 2 bytes long within the chip. \n");
					return -1;
			   }
			   else
#endif
			   {
					devaddr[0] = addr & 0xff;
					devaddr[1] = (addr >> 8) & 0xff;
			   }
			   break;

		case 3:							 //I2C data address:3 bytes long within the chip.
		                                 //Here,if it has 2 bytes long at most.
			   puts ("Here,we have set i2c data address or register address 2 bytes long at most.\n");
			   return -1;
			   break;
	}


		struct i2c_msg msg[] = {
			{
				.addr = chip,
				.flags = 0,
				.len = alen,             //I2C data address length.
				.buf = devaddr,
			},
			{
				.addr = chip,
				.flags = 1,
				.len = len,              //read len bytes from I2C data address.
				.buf = buffer,
			}
		};

	ret = aml_i2c_xfer((struct i2c_msg *)msg, 2);
    if (ret < 0) {
        printf("%s: i2c transfer failed\n", __FUNCTION__);
		return ret;
    }

/*
	printf("chip=0x%x,addr=0x%x,alen=%d,len=%d",chip,addr,alen,len);
    for (ret=0;ret<len;ret++)
		printf(",buffer[%d]=0x%x",ret,*buffer++);
	printf("\n");
*/

	return 0;
}



/*
 * i2c write cmd
 */
int i2c_write(unsigned char chip, unsigned int addr, int alen,unsigned char *buffer, int len)
{
	int ret;
	int length = 0;
	uint8_t buff[3];

    /*
	 * I2C data address within the chip.  This can be 1 or
	 * 2 bytes long.  Some day it might be 3 bytes long :-).
	 * here,if it has 2 bytes long at most.
	 */
	uint8_t devaddr[2] = {0};

	switch (alen)
	{
		case 0:							//NO I2C data address within the chip.
			   puts ("'*.0' shows no i2c data or register address within the chip. \n");
			   return -1;
			   break;

		case 1:							//I2C data address:1 byte long within the chip.
			   if (addr>0xff)
			   {
					puts ("'*.1' shows i2c data or register address 1 byte long within the chip. \n");
					return -1;
			   }
			   else
					devaddr[0] = addr & 0xff;
			   break;

		case 2:
#if 0
			//I2C data address:2 bytes long within the chip.
			if (addr>0xffff || addr<0x1ff)
			{
				puts ("'*.2' shows i2c data or register address 2 bytes long within the chip. \n");
				return -1;
			}
			else
#endif
			   {
					devaddr[0] = addr & 0xff;
					devaddr[1] = (addr >> 8) & 0xff;
			   }
			   break;

		case 3:							//I2C data address:3 bytes long within the chip.
		                                //Here,if it has 2 bytes long at most.
			   puts ("Here,we have set i2c data address or register address 2 bytes long at most.\n");
			   return -1;
			   break;
	}

	if (len == 1)
	{
		switch (alen)
		{

			case 1:
				   buff[0] = devaddr[0];
				   buff[1] = *buffer;
				   length = 2;
			       break;

			case 2:
			       buff[0] = devaddr[0];
			       buff[1] = devaddr[1];
			       buff[2] = *buffer;
			       length = 3;
			       break;
			/*
			case 3:
				   //when i2c data address or register address 3 bytes long ,here should be completed.
				   break;
			*/

		}

		struct i2c_msg msg[] = {
			{
			.addr = chip,
			.flags = 0,
			.len = length,
			.buf = buff,
			}
		};

		ret = aml_i2c_xfer((struct i2c_msg *)msg, 1);
		if (ret < 0) {
		    printf("%s: i2c transfer failed\n", __FUNCTION__);
			    return ret;
		}

	}
	else
	{
	    /*
		 * This section may be modified when len > 1.
	     */
		printf("I2C write data length is %d. \n",len);
		return -1;
	}



	return 0;
}



/*
 * i2c probe cmd
 * return 0:i2c probe ok, non 0:i2c probe failed.
 */
int i2c_probe(uchar chip)
{
	int ret;
    unsigned int addr=0x00;		//i2c data or register address
	struct aml_i2c *i2c = &g_aml_i2c_data;
	struct i2c_msg * p=0;

    struct i2c_msg msg[] = {
			{
			.addr = chip,
			.flags = 0,			//write
			.len = 1,
			.buf = (unsigned char *)&addr,
			}
		};


	i2c->ops->xfer_prepare(i2c);


	p = &msg[0];
	i2c->msg_flags = p->flags;
	ret = i2c->ops->do_address(i2c, p->addr);

	if (p->flags & I2C_M_RD)
		ret = i2c->ops->read(i2c, p->buf, p->len);
	else
		ret = i2c->ops->write(i2c, p->buf, p->len);

	i2c->ops->stop(i2c);

	if (ret == 0)
		return 0;          	 	//This chip valid.
	else
		return ret;         	//This chip invalid.
}



/*
 * i2c reset cmd
 */
void i2c_init(int speed, int slaveaddr)
{
	#define AML_I2C_SPPED_400K 400000		 //The initial value of amlogic i2c speed

	if (g_i2c_ports == NULL) {
		g_i2c_ports = &g_aml_i2c_plat;
		g_cur_bus_num = 0;
	}
	aml_i2c_init();
}



/*
 * i2c speed cmd
 * get i2c speed
 */
unsigned int i2c_get_bus_speed(void)
{

	return g_i2c_ports[g_cur_bus_num].master_i2c_speed;
}



/*
 * i2c speed xxx cmd
 * set i2c speed
 */
int i2c_set_bus_speed(unsigned int speed)
{
/*
#define AML_I2C_SPPED_50K			50000
#define AML_I2C_SPPED_100K			100000
#define AML_I2C_SPPED_200K			200000
#define AML_I2C_SPPED_300K			300000
#define AML_I2C_SPPED_400K			400000
*/
	if ((speed == 50000) || (speed == 100000) || (speed == 200000) || (speed == 300000) || (speed == 400000))
	{
		g_i2c_ports[g_cur_bus_num].master_i2c_speed = speed;
		aml_i2c_init();
		return 0;
	}
	else
	{
		printf("The I2C speed setting don't match,should choose:50000,100000,200000,300000 or 400000.\n");
		return -1;
	}

}
#if defined(CONFIG_CMD_EEPROM)
int i2c_eeprom_write(unsigned char chip, unsigned int addr, int alen,unsigned char *buffer, int len)
{
	int i, err;
	struct aml_i2c *i2c = &g_aml_i2c_data;
	unsigned char buf[4];

	if (alen > 4) return -1;
	for (i=0; i<alen; i++) {
		buf[i] = addr&0xff;
		addr >>= 8;
	}

	i2c->msg_flags = 0;
	i2c->ops->xfer_prepare(i2c);
	i2c->ops->do_address(i2c, chip);
	err = i2c->ops->write(i2c, buf, alen);
	if (!err) {
		i2c->msg_flags |= I2C_M_NOSTART;
		err = i2c->ops->write(i2c, buffer, len);
	}
	i2c->ops->stop(i2c);
	return err;
}
#endif

/*General i2c master transfer,it can Send to a specific master control*/
int aml_i2c_transfer(int adap_num,struct i2c_msg *msgs,
							int num)
{
	AML_I2C_DBG(1, "FILE:%s:%d, FUNC:%s\n", __FILE__,__LINE__,__func__);

	if (0 == g_bAmlogicI2CInitialized) {
		return -ENXIO; //device not initialized
	}

	g_aml_i2c_data.master_no = adap_num;
	struct aml_i2c *i2c = &g_aml_i2c_data;
	i2c->master_regs = (struct aml_i2c_reg_master __iomem*)(g_aml_i2c_reg_start[i2c->master_no]);
	struct i2c_msg * p=0;
	unsigned int i;
	unsigned int ret=0;

	i2c->ops->xfer_prepare(i2c);

	for (i = 0; !ret && i < num; i++) {
		p = &msgs[i];
		i2c->msg_flags = p->flags;
		ret = i2c->ops->do_address(i2c, p->addr);
		if (ret || !p->len)
		{
			continue;
		}
		if (p->flags & I2C_M_RD)
			ret = i2c->ops->read(i2c, p->buf, p->len);
		else
			ret = i2c->ops->write(i2c, p->buf, p->len);
	}

	i2c->ops->stop(i2c);


	if (p->flags & I2C_M_RD) {
		AML_I2C_DBG(0, "read ");
	}
	else {
		AML_I2C_DBG(0, "write ");
	}
	for (i=0;i<p->len;i++)
		AML_I2C_DBG(0, "%x-",*(p->buf)++);
	AML_I2C_DBG(0, "\n");

	/* Return the number of messages processed, or the error code*/
	if (ret == 0)
		return num;
	else {
		printf("[aml_i2c_xfer] error ret = %d \t", ret);
		printf("i2c master %s current slave addr is 0x%x\n",
						i2c->master_no?"a":"b", i2c->cur_slave_addr);
		return ret;
	}
}
unsigned int i2c_get_bus_num()
{
	return g_i2c_ports[g_cur_bus_num].master_no;
}
/*
 * cmd: i2c dev
 */
int i2c_set_bus_num(unsigned int busnum)
{
	int i = 0;
	for (;g_i2c_ports[i].master_i2c_speed > 0;i++) {
		if (g_i2c_ports[i].master_no == busnum) {
			g_cur_bus_num = i;
			break;
		}
	}
	if (g_i2c_ports[i].master_i2c_speed == 0 ) {
		printf("%s no %d busnum enable\n", __func__, busnum);
		return 0;
	}
	printf("%s i2c sel %d bus\n", __func__, busnum);
	aml_i2c_init_port(&g_i2c_ports[i]);
	return 0;
}
void aml_i2c_set_ports(struct aml_i2c_platform *i2c_plat)
{
	g_i2c_ports = i2c_plat;
	aml_i2c_init();
}