mtk-lk/platform/mt6735/mt_i2c.c

#include <platform/mt_i2c.h>
#include <platform/mt_pmic_wrap_init.h>
#include <platform/mt_gpio.h>

/******************************internal API********************************************************/
#define I2C_PMIC_WR(addr, data)   pwrap_write((U32)addr, data)
#define I2C_PMIC_RD(addr)         ({ \
    U32 ext_data; \
    (pwrap_read((U32)addr,&ext_data) != 0)?-1:ext_data;})

static inline void i2c_writel(mt_i2c * i2c, U8 offset, U16 value)
{
  //__raw_writew(value, (i2c->base) + (offset));
  mt_reg_sync_writel(value, (i2c->base) + (offset));
}

static inline U32 i2c_readl(mt_i2c * i2c, U8 offset)
{
  return DRV_Reg32((i2c->base) + (offset));
}
/***********************************declare  API**************************/
static void mt_i2c_clock_enable(mt_i2c *i2c);
static void mt_i2c_clock_disable(mt_i2c *i2c);

/***********************************I2C common Param **************************/
volatile U32 I2C_TIMING_REG_BACKUP[7]={0};

/***********************************i2c debug********************************************************/
#define I2C_DEBUG_FS
#ifdef I2C_DEBUG_FS
  #define PORT_COUNT 7
  #define MESSAGE_COUNT 16
  #define I2C_T_DMA 1
  #define I2C_T_TRANSFERFLOW 2
  #define I2C_T_SPEED 3
  /*7 ports,16 types of message*/
  U8 i2c_port[ PORT_COUNT ][ MESSAGE_COUNT ];

  #define I2CINFO( type, format, arg...) do { \
    if ( type < MESSAGE_COUNT && type >= 0 ) { \
      if ( i2c_port[i2c->id][0] != 0 && ( i2c_port[i2c->id][type] != 0 || i2c_port[i2c->id][MESSAGE_COUNT - 1] != 0) ) { \
        I2CLOG( format, ## arg); \
      } \
    } \
  } while (0)

  #ifdef I2C_DRIVER_IN_KERNEL
    static ssize_t show_config(struct device *dev, struct device_attribute *attr, char *buff)
    {
      S32 i = 0;
      S32 j = 0;
      char *buf = buff;
      for ( i =0; i < PORT_COUNT; i++){
        for ( j=0;j < MESSAGE_COUNT; j++) i2c_port[i][j] += '0';
        strncpy(buf, (char *)i2c_port[i], MESSAGE_COUNT);
        buf += MESSAGE_COUNT;
        *buf = '\n';
        buf++;
        for ( j=0;j < MESSAGE_COUNT; j++) i2c_port[i][j] -= '0';
      }
      return (buf - buff);
    }

    static ssize_t set_config(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
    {
      S32 port,type,status;

      if ( sscanf(buf, "%d %d %d", &port, &type, &status) ) {
        if ( port >= PORT_COUNT || port < 0 || type >= MESSAGE_COUNT || type < 0 ) {
          /*Invalid param*/
          I2CERR("i2c debug system: Parameter overflowed!\n");
        } else {
          if ( status != 0 )
            i2c_port[port][type] = 1;
          else
            i2c_port[port][type] = 0;

          I2CLOG("port:%d type:%d status:%s\ni2c debug system: Parameter accepted!\n", port, type, status?"on":"off");
        }
      } else {
        /*parameter invalid*/
        I2CERR("i2c debug system: Parameter invalid!\n");
      }
      return count;
    }

    static DEVICE_ATTR(debug, S_IRUGO|S_IWUGO, show_config, set_config);
  #endif
#else
  #define I2CINFO(type, format, arg...)
#endif
/***********************************common API********************************************************/
/*Set i2c port speed*/
S32 i2c_set_speed(mt_i2c *i2c)
{
  S32 ret = 0;
  static S32 mode = 0;
  static U32 khz = 0;
  //U32 base = i2c->base;
  U16 step_cnt_div = 0;
  U16 sample_cnt_div = 0;
  U32 tmp, sclk, hclk = i2c->clk;
  U16 max_step_cnt_div = 0;
  U32 diff, min_diff = i2c->clk;
  U16 sample_div = MAX_SAMPLE_CNT_DIV;
  U16 step_div = 0;
  U16 i2c_timing_reg=0;
  //I2CFUC();
  //I2CLOG("i2c_set_speed=================\n");
  //compare the current mode with the latest mode
  i2c_timing_reg=i2c_readl(i2c, OFFSET_TIMING);
  if((mode == i2c->mode) && (khz == i2c->speed)&&(i2c_timing_reg==I2C_TIMING_REG_BACKUP[i2c->id])) {
    I2CINFO( I2C_T_SPEED, " set sclk to %dkhz\n", i2c->speed);
    //I2CLOG(" set sclk to %ldkhz\n", i2c->speed);
    //return 0;
  }
  mode=i2c->mode;
  khz = i2c->speed;

  max_step_cnt_div = (mode == HS_MODE) ? MAX_HS_STEP_CNT_DIV : MAX_STEP_CNT_DIV;
  step_div = max_step_cnt_div;

  if((mode == FS_MODE && khz > MAX_FS_MODE_SPEED) || (mode == HS_MODE && khz > MAX_HS_MODE_SPEED)){
    I2CERR(" the speed is too fast for this mode.\n");
    I2C_BUG_ON((mode == FS_MODE && khz > MAX_FS_MODE_SPEED) || (mode == HS_MODE && khz > MAX_HS_MODE_SPEED));
    ret = -EINVAL_I2C;
    goto end;
  }
//  I2CERR("first:khz=%d,mode=%d sclk=%d,min_diff=%d,max_step_cnt_div=%d\n",khz,mode,sclk,min_diff,max_step_cnt_div);
  /*Find the best combination*/
  for (sample_cnt_div = 1; sample_cnt_div <= MAX_SAMPLE_CNT_DIV; sample_cnt_div++) {
      for (step_cnt_div = 1; step_cnt_div <= max_step_cnt_div; step_cnt_div++) {
        sclk = (hclk >> 1) / (sample_cnt_div * step_cnt_div);
        if (sclk > khz)
          continue;
        diff = khz - sclk;
        if (diff < min_diff) {
          min_diff = diff;
          sample_div = sample_cnt_div;
          step_div   = step_cnt_div;
        }
      }
    }
    sample_cnt_div = sample_div;
    step_cnt_div   = step_div;
  sclk = hclk / (2 * sample_cnt_div * step_cnt_div);
  //I2CERR("second:sclk=%d khz=%d,i2c->speed=%d hclk=%d sample_cnt_div=%d,step_cnt_div=%d.\n",sclk,khz,i2c->speed,hclk,sample_cnt_div,step_cnt_div);
  if (sclk > khz) {
    I2CERR("%s mode: unsupported speed (%dkhz)\n",(mode == HS_MODE) ? "HS" : "ST/FT", khz);
    I2C_BUG_ON(sclk > khz);
    ret = -ENOTSUPP_I2C;
    goto end;
  }

  step_cnt_div--;
  sample_cnt_div--;

  //spin_lock(&i2c->lock);

  if (mode == HS_MODE) {

    /*Set the hignspeed timing control register*/
    tmp = i2c_readl(i2c, OFFSET_TIMING) & ~((0x7 << 8) | (0x3f << 0));
    tmp = (0 & 0x7) << 8 | (16 & 0x3f) << 0 | tmp;
    i2c->timing_reg=tmp;
    //i2c_writel(i2c, OFFSET_TIMING, tmp);
    I2C_TIMING_REG_BACKUP[i2c->id]=tmp;

    /*Set the hign speed mode register*/
    tmp = i2c_readl(i2c, OFFSET_HS) & ~((0x7 << 12) | (0x7 << 8));
    tmp = (sample_cnt_div & 0x7) << 12 | (step_cnt_div & 0x7) << 8 | tmp;
    /*Enable the hign speed transaction*/
    tmp |= 0x0001;
    i2c->high_speed_reg=tmp;
    //i2c_writel(i2c, OFFSET_HS, tmp);
  }
  else {
    /*Set non-highspeed timing*/
    tmp  = i2c_readl(i2c, OFFSET_TIMING) & ~((0x7 << 8) | (0x3f << 0));
    tmp  = (sample_cnt_div & 0x7) << 8 | (step_cnt_div & 0x3f) << 0 | tmp;
    i2c->timing_reg=tmp;
    I2C_TIMING_REG_BACKUP[i2c->id]=tmp;
    //i2c_writel(i2c, OFFSET_TIMING, tmp);
    /*Disable the high speed transaction*/
    //I2CERR("NOT HS_MODE============================1\n");
    tmp = i2c_readl(i2c, OFFSET_HS) & ~(0x0001);
    //I2CERR("NOT HS_MODE============================2\n");
    i2c->high_speed_reg=tmp;
    //i2c_writel(i2c, OFFSET_HS, tmp);
    //I2CERR("NOT HS_MODE============================3\n");
  }
  //spin_unlock(&i2c->lock);
  I2CINFO( I2C_T_SPEED, " set sclk to %dkhz(orig:%dkhz), sample=%d,step=%d\n", sclk, khz, sample_cnt_div, step_cnt_div);
end:
  return ret;
}

void _i2c_dump_info(mt_i2c *i2c)
{
  //I2CFUC();
  I2CERR("I2C structure:\n"
    I2CTAG"Clk=%d,Id=%d,Mode=%x,St_rs=%x,Dma_en=%x,Op=%x,Poll_en=%x,Irq_stat=%x\n"
    I2CTAG"Trans_len=%x,Trans_num=%x,Trans_auxlen=%x,Data_size=%x,speed=%d\n",
    //,Trans_stop=%u,Trans_comp=%u,Trans_error=%u\n"
    i2c->clk,i2c->id,i2c->mode,i2c->st_rs,i2c->dma_en,i2c->op,i2c->poll_en,i2c->irq_stat,
    i2c->trans_data.trans_len,i2c->trans_data.trans_num,i2c->trans_data.trans_auxlen,i2c->trans_data.data_size,i2c->speed);
    // atomic_read(&i2c->trans_stop),atomic_read(&i2c->trans_comp),atomic_read(&i2c->trans_err),

  I2CERR("base address 0x%x\n",i2c->base);
  I2CERR("I2C register:\n"
    I2CTAG"SLAVE_ADDR=%x,INTR_MASK=%x,INTR_STAT=%x,CONTROL=%x,TRANSFER_LEN=%x\n"
    I2CTAG"TRANSAC_LEN=%x,DELAY_LEN=%x,TIMING=%x,START=%x,FIFO_STAT=%x\n"
    I2CTAG"IO_CONFIG=%x,HS=%x,DCM_EN=%x,DEBUGSTAT=%x,EXT_CONF=%x,TRANSFER_LEN_AUX=%x\n",
    (i2c_readl(i2c, OFFSET_SLAVE_ADDR)),
    (i2c_readl(i2c, OFFSET_INTR_MASK)),
    (i2c_readl(i2c, OFFSET_INTR_STAT)),
    (i2c_readl(i2c, OFFSET_CONTROL)),
    (i2c_readl(i2c, OFFSET_TRANSFER_LEN)),
    (i2c_readl(i2c, OFFSET_TRANSAC_LEN)),
    (i2c_readl(i2c, OFFSET_DELAY_LEN)),
    (i2c_readl(i2c, OFFSET_TIMING)),
    (i2c_readl(i2c, OFFSET_START)),
    (i2c_readl(i2c, OFFSET_FIFO_STAT)),
    (i2c_readl(i2c, OFFSET_IO_CONFIG)),
    (i2c_readl(i2c, OFFSET_HS)),
    (i2c_readl(i2c, OFFSET_DCM_EN)),
    (i2c_readl(i2c, OFFSET_DEBUGSTAT)),
    (i2c_readl(i2c, OFFSET_EXT_CONF)),
    (i2c_readl(i2c, OFFSET_TRANSFER_LEN_AUX)));
  /*
  I2CERR("DMA register:\nINT_FLAG %x\nCON %x\nTX_MEM_ADDR %x\nRX_MEM_ADDR %x\nTX_LEN %x\nRX_LEN %x\nINT_EN %x\nEN %x\n",
      (__raw_readl(i2c->pdmabase+OFFSET_INT_FLAG)),
      (__raw_readl(i2c->pdmabase+OFFSET_CON)),
      (__raw_readl(i2c->pdmabase+OFFSET_TX_MEM_ADDR)),
      (__raw_readl(i2c->pdmabase+OFFSET_RX_MEM_ADDR)),
      (__raw_readl(i2c->pdmabase+OFFSET_TX_LEN)),
      (__raw_readl(i2c->pdmabase+OFFSET_RX_LEN)),
      (__raw_readl(i2c->pdmabase+OFFSET_S32_EN)),
      (__raw_readl(i2c->pdmabase+OFFSET_EN)));
  */
  /*6589 side and PMIC side clock*/
  //I2CERR("Clock %s\n",(((DRV_Reg32(0xF0003018)>>26) | (DRV_Reg32(0xF000301c)&0x1 << 6)) & (1 << i2c->id))?"disable":"enable");
  //if(i2c->id >=4)
  //  I2CERR("Clock PMIC %s\n",((I2C_PMIC_RD(0x011A) & 0x7) & (1 << (i2c->id - 4)))?"disable":"enable");
      //1<<(i2c->id-4): 0x011A bit[0~2]:i2c0~2,i2c->id:i2c 4~6
  return;
}
static S32 _i2c_deal_result(mt_i2c *i2c)
{
  #ifdef I2C_DRIVER_IN_KERNEL
    long tmo = i2c->adap.timeout;
  #else
    long tmo = 1;
  #endif
  U16 data_size = 0;
  U8 *ptr = i2c->msg_buf;
  BOOL TRANSFER_ERROR=FALSE;
  S32 ret = i2c->msg_len;
  long tmo_poll = 0xffff;
  //I2CFUC();
  //addr_reg = i2c->read_flag ? ((i2c->addr << 1) | 0x1) : ((i2c->addr << 1) & ~0x1);

  if(i2c->poll_en)
  { /*master read && poll mode*/
    for (;;)
    { /*check the interrupt status register*/
      i2c->irq_stat = i2c_readl(i2c, OFFSET_INTR_STAT);
      //I2CLOG("irq_stat = 0x%x\n", i2c->irq_stat);
      if(i2c->irq_stat & (I2C_HS_NACKERR | I2C_ACKERR ))
      {
        //transfer error
        //atomic_set(&i2c->trans_stop, 1);
        //spin_lock(&i2c->lock);
        /*Clear interrupt status,write 1 clear*/
        //i2c_writel(i2c, OFFSET_INTR_STAT, (I2C_HS_NACKERR | I2C_ACKERR ));
        TRANSFER_ERROR=TRUE;
        tmo = 1;
        //spin_unlock(&i2c->lock);
        break;
      }else if(i2c->irq_stat &  I2C_TRANSAC_COMP)
      {
        //transfer complete
        tmo = 1;
        break;
      }
      tmo_poll --;
      if(tmo_poll == 0) {
        tmo = 0;
        break;
      }
    }
  } else { /*Interrupt mode,wait for interrupt wake up*/
    //tmo = wait_event_timeout(i2c->wait,atomic_read(&i2c->trans_stop), tmo);
  }

  /*Save status register status to i2c struct*/
  #ifdef I2C_DRIVER_IN_KERNEL
    if (i2c->irq_stat & I2C_TRANSAC_COMP) {
      atomic_set(&i2c->trans_err, 0);
      atomic_set(&i2c->trans_comp, 1);
    }
    atomic_set(&i2c->trans_err, i2c->irq_stat & (I2C_HS_NACKERR | I2C_ACKERR));
  #endif
  //I2CLOG("tmo = 0x%x\n", tmo);
  /*Check the transfer status*/
  if (!(tmo == 0 )&& TRANSFER_ERROR==FALSE )
  {
    /*Transfer success ,we need to get data from fifo*/
    if((!i2c->dma_en) && (i2c->op == I2C_MASTER_RD || i2c->op == I2C_MASTER_WRRD) )
    { /*only read mode or write_read mode and fifo mode need to get data*/
      data_size = (i2c_readl(i2c, OFFSET_FIFO_STAT) >> 4) & 0x000F;
      //I2CLOG("data_size=%d\n",data_size);
      while (data_size--)
      {
        *ptr = i2c_readl(i2c, OFFSET_DATA_PORT);
        #ifdef I2C_EARLY_PORTING
          I2CLOG("addr %x read byte = 0x%x\n", i2c->addr, *ptr);
        #endif
        ptr++;
      }
    }
  }else
  {
    /*Timeout or ACKERR*/
    if ( tmo == 0 ){
      I2CERR("id=%d,addr: %x, transfer timeout\n",i2c->id, i2c->addr);
      ret = -ETIMEDOUT_I2C;
    } else
    {
      I2CERR("id=%d,addr: %x, transfer error\n",i2c->id,i2c->addr);
      ret = -EREMOTEIO_I2C;
    }
    if (i2c->irq_stat & I2C_HS_NACKERR)
      I2CERR("I2C_HS_NACKERR\n");
    if (i2c->irq_stat & I2C_ACKERR)
      I2CERR("I2C_ACKERR\n");
    if (i2c->filter_msg==FALSE) //TEST
    {
      _i2c_dump_info(i2c);
    }

    //spin_lock(&i2c->lock);
    /*Reset i2c port*/
    i2c_writel(i2c, OFFSET_SOFTRESET, 0x0001);
    /*Set slave address*/
    i2c_writel( i2c, OFFSET_SLAVE_ADDR, 0x0000 );
    /*Clear interrupt status*/
    i2c_writel(i2c, OFFSET_INTR_STAT, (I2C_HS_NACKERR|I2C_ACKERR|I2C_TRANSAC_COMP));
    /*Clear fifo address*/
    i2c_writel(i2c, OFFSET_FIFO_ADDR_CLR, 0x0001);

    //spin_unlock(&i2c->lock);
  }
  return ret;
}


void _i2c_write_reg(mt_i2c *i2c)
{
  U8 *ptr = i2c->msg_buf;
  U32 data_size=i2c->trans_data.data_size;
  U32 addr_reg=0;
  //I2CFUC();

  i2c_writel(i2c, OFFSET_CONTROL, i2c->control_reg);

  /*set start condition */
  if(i2c->speed <= 100){
    i2c_writel(i2c,OFFSET_EXT_CONF, 0x8001);
  }
  //set timing reg
  i2c_writel(i2c, OFFSET_TIMING, i2c->timing_reg);
  i2c_writel(i2c, OFFSET_HS, i2c->high_speed_reg);

  if(0 == i2c->delay_len)
    i2c->delay_len = 2;
  if(~i2c->control_reg & I2C_CONTROL_RS){  // bit is set to 1, i.e.,use repeated stop
    i2c_writel(i2c, OFFSET_DELAY_LEN, i2c->delay_len);
  }

  /*Set ioconfig*/
  if (i2c->pushpull) {
      i2c_writel(i2c, OFFSET_IO_CONFIG, 0x0000);
  } else {
      i2c_writel(i2c, OFFSET_IO_CONFIG, 0x0003);
  }

  /*Set slave address*/

  addr_reg = i2c->read_flag ? ((i2c->addr << 1) | 0x1) : ((i2c->addr << 1) & ~0x1);
  i2c_writel(i2c, OFFSET_SLAVE_ADDR, addr_reg);
  /*Clear interrupt status*/
  i2c_writel(i2c, OFFSET_INTR_STAT, (I2C_HS_NACKERR | I2C_ACKERR | I2C_TRANSAC_COMP));
  /*Clear fifo address*/
  i2c_writel(i2c, OFFSET_FIFO_ADDR_CLR, 0x0001);
  /*Setup the interrupt mask flag*/
  if(i2c->poll_en)
    i2c_writel(i2c, OFFSET_INTR_MASK, i2c_readl(i2c, OFFSET_INTR_MASK) & ~(I2C_HS_NACKERR | I2C_ACKERR | I2C_TRANSAC_COMP)); /*Disable interrupt*/
  else
    i2c_writel(i2c, OFFSET_INTR_MASK, i2c_readl(i2c, OFFSET_INTR_MASK) | (I2C_HS_NACKERR | I2C_ACKERR | I2C_TRANSAC_COMP)); /*Enable interrupt*/
  /*Set transfer len */
  i2c_writel(i2c, OFFSET_TRANSFER_LEN, i2c->trans_data.trans_len & 0xFFFF);
  i2c_writel(i2c, OFFSET_TRANSFER_LEN_AUX, i2c->trans_data.trans_auxlen & 0xFFFF);
  /*Set transaction len*/
  i2c_writel(i2c, OFFSET_TRANSAC_LEN, i2c->trans_data.trans_num & 0xFF);

  /*Prepare buffer data to start transfer*/

  if(i2c->dma_en)
  {
    /* Reset I2C DMA status */
    mt_reg_sync_writel(0x0001, i2c->pdmabase + OFFSET_RST);
    if (I2C_MASTER_RD == i2c->op) {
      mt_reg_sync_writel(0x0000, i2c->pdmabase + OFFSET_INT_FLAG);
      mt_reg_sync_writel(0x0001, i2c->pdmabase + OFFSET_CON);
      mt_reg_sync_writel((U32)i2c->msg_buf, i2c->pdmabase + OFFSET_RX_MEM_ADDR);
      mt_reg_sync_writel(i2c->trans_data.data_size, i2c->pdmabase + OFFSET_RX_LEN);
    } else if (I2C_MASTER_WR == i2c->op) {
      mt_reg_sync_writel(0x0000, i2c->pdmabase + OFFSET_INT_FLAG);
      mt_reg_sync_writel(0x0000, i2c->pdmabase + OFFSET_CON);
      mt_reg_sync_writel((U32)i2c->msg_buf, i2c->pdmabase + OFFSET_TX_MEM_ADDR);
      mt_reg_sync_writel(i2c->trans_data.data_size, i2c->pdmabase + OFFSET_TX_LEN);
    } else {
      mt_reg_sync_writel(0x0000, i2c->pdmabase + OFFSET_INT_FLAG);
      mt_reg_sync_writel(0x0000, i2c->pdmabase + OFFSET_CON);
      mt_reg_sync_writel((U32)i2c->msg_buf, i2c->pdmabase + OFFSET_TX_MEM_ADDR);
      mt_reg_sync_writel((U32)i2c->msg_buf, i2c->pdmabase + OFFSET_RX_MEM_ADDR);
      mt_reg_sync_writel(i2c->trans_data.trans_len, i2c->pdmabase + OFFSET_TX_LEN);
      mt_reg_sync_writel(i2c->trans_data.trans_auxlen, i2c->pdmabase + OFFSET_RX_LEN);
    }
    I2C_MB();
    mt_reg_sync_writel(0x0001, i2c->pdmabase + OFFSET_EN);

    I2CINFO( I2C_T_DMA, "addr %.2x dma %.2X byte\n", i2c->addr, i2c->trans_data.data_size);
    I2CINFO( I2C_T_DMA, "DMA Register:INT_FLAG:0x%x,CON:0x%x,TX_MEM_ADDR:0x%x, \
                 RX_MEM_ADDR:0x%x,TX_LEN:0x%x,RX_LEN:0x%x,EN:0x%x\n",\
                  DRV_Reg32(i2c->pdmabase + OFFSET_INT_FLAG),\
                  DRV_Reg32(i2c->pdmabase + OFFSET_CON),\
                  DRV_Reg32(i2c->pdmabase + OFFSET_TX_MEM_ADDR),\
                  DRV_Reg32(i2c->pdmabase + OFFSET_RX_MEM_ADDR),\
                  DRV_Reg32(i2c->pdmabase + OFFSET_TX_LEN),\
                  DRV_Reg32(i2c->pdmabase + OFFSET_RX_LEN),\
                  DRV_Reg32(i2c->pdmabase + OFFSET_EN));

  }
  else
  {
    /*Set fifo mode data*/
    if (I2C_MASTER_RD == i2c->op)
    {
      /*do not need set fifo data*/
    }else
    { /*both write && write_read mode*/
      while (data_size--)
      {
        i2c_writel(i2c, OFFSET_DATA_PORT, *ptr);
        //dev_info(i2c->dev, "addr %.2x write byte = 0x%.2X\n", addr, *ptr);
        ptr++;
      }
    }
  }
  /*Set trans_data*/
  i2c->trans_data.data_size = data_size;

}
S32 _i2c_get_transfer_len(mt_i2c *i2c)
{
  S32 ret = I2C_OK;
  u16 trans_num = 0;
  u16 data_size = 0;
  u16 trans_len = 0;
  u16 trans_auxlen = 0;
  //I2CFUC();
  /*Get Transfer len and transaux len*/
  if(FALSE == i2c->dma_en)
  { /*non-DMA mode*/
    if(I2C_MASTER_WRRD != i2c->op)
    {
      trans_len = (i2c->msg_len) & 0xFFFF;
      trans_num = (i2c->msg_len >> 16) & 0xFF;
      if(0 == trans_num)
        trans_num = 1;
      trans_auxlen = 0;
      data_size = trans_len*trans_num;

      if(!trans_len || !trans_num || trans_len*trans_num > I2C_FIFO_SIZE)
      {
        I2CERR(" non-WRRD transfer length is not right. trans_len=%x, tans_num=%x, trans_auxlen=%x\n", trans_len, trans_num, trans_auxlen);
        I2C_BUG_ON(!trans_len || !trans_num || trans_len*trans_num > I2C_FIFO_SIZE);
        ret = -EINVAL_I2C;
      }
    } else
    {
      trans_len = (i2c->msg_len) & 0xFFFF;
      trans_auxlen = (i2c->msg_len >> 16) & 0xFFFF;
      trans_num = 2;
      data_size = trans_len;
      if(!trans_len || !trans_auxlen || trans_len > I2C_FIFO_SIZE || trans_auxlen > I2C_FIFO_SIZE)
      {
        I2CERR(" WRRD transfer length is not right. trans_len=%x, tans_num=%x, trans_auxlen=%x\n", trans_len, trans_num, trans_auxlen);
        I2C_BUG_ON(!trans_len || !trans_auxlen || trans_len > I2C_FIFO_SIZE || trans_auxlen > I2C_FIFO_SIZE);
        ret = -EINVAL_I2C;
      }
    }
  }
  else
  { /*DMA mode*/
    if(I2C_MASTER_WRRD != i2c->op)
    {
      trans_len = (i2c->msg_len) & 0xFFFF;
      trans_num = (i2c->msg_len >> 16) & 0xFF;
      if(0 == trans_num)
        trans_num = 1;
      trans_auxlen = 0;
      data_size = trans_len*trans_num;

      if(!trans_len || !trans_num || trans_len > MAX_DMA_TRANS_SIZE || trans_num > MAX_DMA_TRANS_NUM)
      {
        I2CERR(" DMA non-WRRD transfer length is not right. trans_len=%x, tans_num=%x, trans_auxlen=%x\n", trans_len, trans_num, trans_auxlen);
        I2C_BUG_ON(!trans_len || !trans_num || trans_len > MAX_DMA_TRANS_SIZE || trans_num > MAX_DMA_TRANS_NUM);
        ret = -EINVAL_I2C;
      }
      I2CINFO(I2C_T_DMA, "DMA non-WRRD mode!trans_len=%x, tans_num=%x, trans_auxlen=%x\n",trans_len, trans_num, trans_auxlen);
    } else
    {
      trans_len = (i2c->msg_len) & 0xFFFF;
      trans_auxlen = (i2c->msg_len >> 16) & 0xFFFF;
      trans_num = 2;
      data_size = trans_len;
      if(!trans_len || !trans_auxlen || trans_len > MAX_DMA_TRANS_SIZE || trans_auxlen > MAX_DMA_TRANS_NUM)
      {
        I2CERR(" DMA WRRD transfer length is not right. trans_len=%x, tans_num=%x, trans_auxlen=%x\n", trans_len, trans_num, trans_auxlen);
        I2C_BUG_ON(!trans_len || !trans_auxlen || trans_len > MAX_DMA_TRANS_SIZE || trans_auxlen > MAX_DMA_TRANS_NUM);
        ret = -EINVAL_I2C;
      }
      I2CINFO(I2C_T_DMA, "DMA WRRD mode!trans_len=%x, tans_num=%x, trans_auxlen=%x\n",trans_len, trans_num, trans_auxlen);
    }
  }

  i2c->trans_data.trans_num = trans_num;
  i2c->trans_data.trans_len = trans_len;
  i2c->trans_data.data_size = data_size;
  i2c->trans_data.trans_auxlen = trans_auxlen;

  return ret;
}
S32 _i2c_transfer_interface(mt_i2c *i2c)
{
  S32 return_value=0;
  S32 ret=0;
  U8 *ptr = i2c->msg_buf;
  //I2CFUC();

  if(i2c->dma_en)
  {
    I2CINFO( I2C_T_DMA, "DMA Transfer mode!\n");
    if (i2c->pdmabase == 0) {
      I2CERR(" I2C%d doesnot support DMA mode!\n",i2c->id);
      I2C_BUG_ON(i2c->pdmabase == NULL);
      ret = -EINVAL_I2C;
      goto err;
    }
    if((U32)ptr > DMA_ADDRESS_HIGH){
      I2CERR(" DMA mode should use physical buffer address!\n");
      I2C_BUG_ON((U32)ptr > DMA_ADDRESS_HIGH);
      ret = -EINVAL_I2C;
      goto err;
    }
  }
#ifdef I2C_DRIVER_IN_KERNEL
  atomic_set(&i2c->trans_stop, 0);
  atomic_set(&i2c->trans_comp, 0);
  atomic_set(&i2c->trans_err, 0);
#endif
  i2c->irq_stat = 0;

  return_value=_i2c_get_transfer_len(i2c);
  if ( return_value < 0 ){
    I2CERR("_i2c_get_transfer_len fail,return_value=%d\n",return_value);
    ret =-EINVAL_I2C;
    goto err;
  }
  //get clock
  i2c->clk = I2C_CLK_RATE;

  return_value=i2c_set_speed(i2c);
  if ( return_value < 0 ){
    I2CERR("i2c_set_speed fail,return_value=%d\n",return_value);
    ret =-EINVAL_I2C;
    goto err;
  }
  /*Set Control Register*/
#ifdef CONFIG_MT_I2C_FPGA_ENABLE
  i2c->control_reg = I2C_CONTROL_ACKERR_DET_EN;
#else
  i2c->control_reg = I2C_CONTROL_ACKERR_DET_EN | I2C_CONTROL_CLK_EXT_EN;
#endif
  if(i2c->dma_en) {
    i2c->control_reg |= I2C_CONTROL_DMA_EN;
  }
  if(I2C_MASTER_WRRD == i2c->op)
    i2c->control_reg |= I2C_CONTROL_DIR_CHANGE;

  if(HS_MODE == i2c->mode || (i2c->trans_data.trans_num > 1 && I2C_TRANS_REPEATED_START == i2c->st_rs)) {
    i2c->control_reg |= I2C_CONTROL_RS;
  }

  //spin_lock(&i2c->lock);
  _i2c_write_reg(i2c);

  /*All register must be prepared before setting the start bit [SMP]*/
  I2C_MB();
#ifdef I2C_DRIVER_IN_KERNEL
  /*This is only for 3D CAMERA*/
  if (i2c->i2c_3dcamera_flag)
  {
    //spin_unlock(&i2c->lock);
    if (g_i2c[0] == NULL)
    g_i2c[0] = i2c;
    else
    g_i2c[1] = i2c;

    goto end;
  }
#endif
  I2CINFO( I2C_T_TRANSFERFLOW, "Before start .....\n");
  /*Start the transfer*/
  i2c_writel(i2c, OFFSET_START, 0x0001);
  //spin_unlock(&i2c->lock);
  ret = _i2c_deal_result(i2c);
  I2CINFO(I2C_T_TRANSFERFLOW, "After i2c transfer .....\n");
err:

    return ret;
}
S32 _i2c_check_para(mt_i2c *i2c)
{
  S32 ret=0;
  //I2CFUC();
  if(i2c->addr == 0){
    I2CERR(" addr is invalid.\n");
    I2C_BUG_ON(i2c->addr == NULL);
    ret = -EINVAL_I2C;
    goto err;
  }

  if(i2c->msg_buf == NULL){
    I2CERR(" data buffer is NULL.\n");
    I2C_BUG_ON(i2c->msg_buf == NULL);
    ret = -EINVAL_I2C;
    goto err;
  }
err:
  return ret;

}
void _config_mt_i2c(mt_i2c *i2c)
{
  //I2CFUC();
  switch(i2c->id)
  {
    case 0:
      i2c->base = I2C0_BASE;
      break;
    case 1:
      i2c->base = I2C1_BASE;
      break;
    case 2:
      i2c->base = I2C2_BASE;
      break;
    case 3:
      i2c->base = I2C3_BASE;
      break;
#if (6753== MACH_TYPE)
	case 4:
      i2c->base = I2C4_BASE;
      break;
#endif
    default:
      I2CERR("invalid para: i2c->id=%d\n",i2c->id);
      break;
  }
  if(i2c->st_rs == I2C_TRANS_REPEATED_START)
    i2c->st_rs = I2C_TRANS_REPEATED_START;
  else
    i2c->st_rs = I2C_TRANS_STOP;
#if 0
  if(i2c->dma_en == TRUE)
    i2c->dma_en = TRUE;
  else
    i2c->dma_en = FALSE;
#else
  i2c->dma_en = FALSE;
#endif
  i2c->poll_en = TRUE;

  if(i2c->filter_msg == TRUE)
    i2c->filter_msg = TRUE;
  else
    i2c->filter_msg = FALSE;

  ///*Set device speed,set it before set_control register
  if(0 == i2c->speed)
  {
    i2c->mode  = ST_MODE;
    i2c->speed = MAX_ST_MODE_SPEED;
  }
  else
  {
    if (i2c->mode  == HS_MODE)
    i2c->mode  = HS_MODE;
    else
    i2c->mode  = FS_MODE;
  }

  /*Set ioconfig*/
  if (i2c->pushpull==TRUE)
    i2c->pushpull=TRUE;
  else
    i2c->pushpull=FALSE;

}

/*-----------------------------------------------------------------------
 * new read interface: Read bytes
 *   mt_i2c:    I2C chip config, see mt_i2c_t.
 *   buffer:  Where to read/write the data.
 *   len:     How many bytes to read/write
 *   Returns: ERROR_CODE
 */
S32 i2c_read(mt_i2c *i2c,U8 *buffer, U32 len)
{
  S32 ret = I2C_OK;
  #ifdef I2C_EARLY_PORTING
  I2CFUC();
  #endif
  //read
  i2c->read_flag|= I2C_M_RD;
  i2c->op = I2C_MASTER_RD;
  i2c->msg_buf = buffer;
  i2c->msg_len = len;
  i2c->pdmabase = AP_DMA_BASE + 0x180 + (0x80*(i2c->id));
  ret=_i2c_check_para(i2c);
  if(ret< 0){
    I2CERR(" _i2c_check_para fail\n");
    goto err;
  }

  _config_mt_i2c(i2c);
  //get the addr
  ret=_i2c_transfer_interface(i2c);

  if((int)i2c->msg_len != ret){
    I2CERR("read %d bytes fails,ret=%d.\n",i2c->msg_len,ret);
    ret = -1;
    return ret;
  }else{
    ret = I2C_OK;
    //I2CLOG("read %d bytes pass,ret=%d.\n",i2c->msg_len,ret);
  }
err:
  return ret;
}

/*-----------------------------------------------------------------------
 * New write interface: Write bytes
 *   i2c:    I2C chip config, see mt_i2c_t.
 *   buffer:  Where to read/write the data.
 *   len:     How many bytes to read/write
 *   Returns: ERROR_CODE
 */
S32 i2c_write(mt_i2c *i2c,U8  *buffer, U32 len)
{
  S32 ret = I2C_OK;
  #ifdef I2C_EARLY_PORTING
    I2CFUC();
  #endif
  //write
  i2c->read_flag = !I2C_M_RD;
  i2c->op = I2C_MASTER_WR;
  i2c->msg_buf = buffer;
  i2c->msg_len = len;
  i2c->pdmabase = AP_DMA_BASE + 0x180 + (0x80*(i2c->id));
  ret=_i2c_check_para(i2c);
  if(ret< 0){
    I2CERR(" _i2c_check_para fail\n");
    goto err;
  }

  _config_mt_i2c(i2c);
  //get the addr
  ret=_i2c_transfer_interface(i2c);

  if((int)i2c->msg_len != ret){
    I2CERR("Write %d bytes fails,ret=%d.\n",i2c->msg_len,ret);
    ret = -1;
    return ret;
  }else{
    ret = I2C_OK;
    //I2CLOG("Write %d bytes pass,ret=%d.\n",i2c->msg_len,ret);
  }
err:
  return ret;
}

/*-----------------------------------------------------------------------
 * New write then read back interface: Write bytes then read bytes
 *   i2c:    I2C chip config, see mt_i2c_t.
 *   buffer:  Where to read/write the data.
 *   write_len:     How many bytes to write
 *   read_len:     How many bytes to read
 *   Returns: ERROR_CODE
 */
S32 i2c_write_read(mt_i2c *i2c,U8 *buffer, U32 write_len, U32 read_len)
{
  S32 ret = I2C_OK;
  //I2CFUC();
  //write and read
  i2c->op = I2C_MASTER_WRRD;
  i2c->read_flag=!I2C_M_RD;
  i2c->msg_buf = buffer;
  i2c->msg_len = ((read_len & 0xFFFF) << 16) | (write_len & 0xFFFF);
  i2c->pdmabase = AP_DMA_BASE + 0x180 + (0x80*(i2c->id));
  ret=_i2c_check_para(i2c);
  if(ret< 0){
    I2CERR(" _i2c_check_para fail\n");
    goto err;
  }

  _config_mt_i2c(i2c);
  //get the addr
  ret=_i2c_transfer_interface(i2c);

  if((int)i2c->msg_len != ret){
    I2CERR("write_read 0x%x bytes fails,ret=%d.\n",i2c->msg_len,ret);
    ret = -1;
    return ret;
  }else{
    ret = I2C_OK;
    //I2CLOG("write_read 0x%x bytes pass,ret=%d.\n",i2c->msg_len,ret);
  }
err:
  return ret;
}

int i2c_hw_init(void)
{
	return 0;
}

//Test I2C
#ifdef I2C_EARLY_PORTING
int mt_i2c_test_eeprom(int id)
{
  U32 ret = 0;
  U32 len=0;
  unsigned char write_byte[2],read_byte[2];
  struct mt_i2c_t i2c;

  i2c.id = id;
  i2c.addr = 0x50;
  i2c.mode = FS_MODE;
  i2c.speed = 100;
  //==================================================
  I2CLOG("test i2c write\n");
  write_byte[0] = 0x20;
  write_byte[1] = 0x55;
  len=2;
  ret = i2c_write(&i2c, write_byte, len);
  if(I2C_OK != ret){
    I2CERR("Write 2 bytes fails(%x).\n",ret);
    ret = -1;
    return ret;
  }else{
    I2CLOG("Write 2 bytes pass,these bytes are %x, %x.\n", write_byte[0], write_byte[1]);
  }

  mdelay(100);
  //==================================================
  I2CLOG("test i2c read\n");
  //1st:write addree 00,1byte(0x0A)
  write_byte[0] = 0x20;
  write_byte[1] = 0x0A;
  len=1;
  ret = i2c_write(&i2c, write_byte, len);

  mdelay(100);

  read_byte[0] = 0x20;
  len=1;
  ret = i2c_read(&i2c, read_byte, len);
  if((I2C_OK != ret)&&read_byte[0]==write_byte[1]){
    I2CERR("read 2 bytes fails(%x).\n",ret);
    ret = -1;
    return ret;
  }else{
    I2CLOG("read 2 bytes pass,read_byte=%x,write_byte= %x.\n", read_byte[0], write_byte[1]);
  }

  mdelay(100);
  //==================================================
  I2CLOG("test i2c write_read\n");
  write_byte[0] = 0x20;
  // write_byte[1] = 0x34;
  len = ((1 & 0xFFFF) << 16) | (1 & 0xFFFF);
  ret = i2c_write_read(&i2c, write_byte, 1, 1);
  if(I2C_OK != ret){
    I2CERR("Write 1 byte fails(ret=%x).\n",ret);
    ret = -1;
    return ret;
  }else{
    I2CLOG("Read 1 byte pass ,this byte is %x.\n", write_byte[0]);
    ret = 0;
  }
  return ret;
}

int mt_i2c_test(void)
{
  int ret;
  int i = 0;
  I2CFUC();
  for (i = 0; i < I2C_NR; i++) {
    ret = mt_i2c_test_eeprom(i);
    if (0 == ret) {
      I2CLOG("I2C%d,EEPROM test PASS!!\n", i);
    } else {
      I2CLOG("I2C%d,EEPROM test FAIL!!(%d)\n", i, ret);
    }
  }
  return 0;
}
#endif