boot/common/src/uboot/drivers/serial/uart.c

/*******************************************************************************
 * Copyright (C) 2016, ZIXC Corporation.
 *
 * File Name:    
 * File Mark:    
 * Description:  
 * Others:        
 * Version:       v1.0
 * Author:        zhouqi
 * Date:          2012-10-23
 * History 1:      
 *     Date: 
 *     Version:
 *     Author: 
 *     Modification:  
 * History 2: 
  ********************************************************************************/

#include <common.h>
#include <asm/arch/hardware.h>
#include <asm/arch/uart.h>
#include <asm/arch/lsp_crpm.h>
#include <config.h>


DECLARE_GLOBAL_DATA_PTR;      

/*******************************************************************************
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 ********************************************************************************/
unsigned int serial_getclock(void)
{   
    
    #if 0
    if( __REG(PLL_624_208_CFG0_REG) & PLL_624_208_CFG0_LOCK )        
        return 104000000;
    else
    {
        return 26000000/6;
    }
    #endif
    return 26000000;
}

/*******************************************************************************
 * Function:    serial_gpio_config
 * Description: 
 * Parameters: 
 *   Input:
 *
 *   Output:
 *
 * Returns: 
 *
 *
 * Others: 
 ********************************************************************************/
static void serial_gpio_config(void)
{
#ifdef CONFIG_ZX297520V3E_CPE
	unsigned int tmp = 0;
	/*uart0_cts----->uart1_txd*/
	__REG(PAD_TOP_FUNC_BASE+0x20) |= (1<<2);
	tmp = __REG(PAD_PD_FUNC_BASE+0x4);
	tmp &= ~(0x3<<2);
	__REG(PAD_PD_FUNC_BASE+0x4) = tmp | (0x1<<2);

	/*uart0_rts----->uart1_rxd*/
    __REG(PAD_TOP_FUNC_BASE+0x20) |= (1<<3);
	tmp = __REG(PAD_PD_FUNC_BASE+0x4);
	tmp &= ~(0x3<<4);
	__REG(PAD_PD_FUNC_BASE+0x4) = tmp | (0x1<<4);

#endif
}


/*******************************************************************************
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 * Description: ÉèÖô®¿ÚµÄ²¨ÌØÂÊ
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 ********************************************************************************/
void serial_setbrg(void)
{
    u32 uartClk = serial_getclock();
    u32 ibrd = uartClk / (CONFIG_BAUDRATE << 4);
    u32 fbrd = (((uartClk-((ibrd*CONFIG_BAUDRATE)<<4))<<6)+(CONFIG_BAUDRATE<<3))/(CONFIG_BAUDRATE<<4);
    __REG(UART_IBRD) = ibrd;
    __REG(UART_FBRD) = fbrd;  
}


/*******************************************************************************
 * Function: 
 * Description: ³õʼ»¯´®¿Ú²ÎÊý  115200
 * Parameters: 
 *   Input:
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 ********************************************************************************/
int serial_init(void)
{
    //Òý½Å¸´ÓÃÉèÖÃ,ʹÓÃUART1(2)
	//gpio_set_reuse(UART0_TXD, 0);  //FPGA NOUSED
	//gpio_set_reuse(UART0_RXD, 0);

	/* Òý½Å¸´ÓÃÉèÖà */
	serial_gpio_config();

    // ½ûÓÃUART
    __REG(UART_ICR) = 0xffff;
    __REG(UART_CR) &= (~UART_EN ); 

    // ²¨ÌØÂÊÉèÖÃ
    serial_setbrg();    
    
    // ÉèÖô«Êä¸ñʽΪ: ÎÞУÑé/1λֹͣλ/8λÊý¾Ýλ/ʹÄÜ FIFO £»¼Ä´æÆ÷³õʼ»¯Îª 0x0
    __REG(UART_LCR_H) &= (~(UART_BREAK | UART_PEN | UART_STP2 ));
    __REG(UART_LCR_H) |= (UART_WLEN_8 | UART_FEN );

    // ÆÁ±ÎËùÓеÄuartÄ£¿é·¢³öµÄÖжÏ
    __REG(UART_IMSC) &= (~UART_INT_MASK);

    // ʹÄÜUART
    __REG(UART_CR) |= (UART_TXE | UART_RXE | UART_EN ); 

    return	0;   
}


/*******************************************************************************
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 ********************************************************************************/
int serial_getc(void)
{
	while ((__REG(UART_FR) & UART_RXFE) != 0 );
	return (__REG(UART_DR) & 0xff);
}


#ifdef CONFIG_CTRL_X_SWTCH_UART
/*******************************************************************************
 * Function:  check if user press ctrl +x from uboot serial
 * Description: read console flag before start kernel
 * Parameters: us °´¼ü·À¶¶Ê±¼ä£¬wait µÈ´ý°´¼ü×Üʱ¼ä
 *   Input:
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 *
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 ********************************************************************************/
extern bool g_flg_ctrl_x;
void serial_getc_cons_key_flag(unsigned long us,unsigned int wait)
{
	int c1,c2;
	static int cnt_wait = 0;
	while(1)
	{
		if((__REG(UART_FR) & UART_RXFE) == 0)
			c1 = (__REG(UART_DR) & 0xff);
		udelay(us);
		if((__REG(UART_FR) & UART_RXFE) == 0)
			c2 = (__REG(UART_DR) & 0xff);
		if((c1 == c2) && (c1 == 24)){
			g_flg_ctrl_x = false;
			debug("ctrk+x:get.\n");
			return 1;
		}
		if(cnt_wait > wait){
			debug("ctrk+x:not get.\n");
			g_flg_ctrl_x = true;
			cnt_wait = 0;
			return 0;
		}else{
			cnt_wait++;
		}
	}
	return 0;	
}
#endif
#ifdef CONFIG_HWFLOW
static int hwflow = 0; /* turned off by default */
int hwflow_onoff(int on)
{
	switch(on) {
	case 0:
	default:
		break; /* return current */
	case 1:
		hwflow = 1; /* turn on */
		break;
	case -1:
		hwflow = 0; /* turn off */
		break;
	}
	return hwflow;
}
#endif

#ifdef CONFIG_MODEM_SUPPORT
static int be_quiet = 0;
void disable_putc(void)
{
	be_quiet = 1;
}

void enable_putc(void)
{
	be_quiet = 0;
}
#endif


/*******************************************************************************
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 ********************************************************************************/
void serial_putc(const char c)
{
#ifdef CONFIG_MODEM_SUPPORT
	if (be_quiet)
		return;
#endif

	/* µÈ´ý·¢ËÍ FIFO ²»Âú£¬¿ÉÒÔдÊý¾Ý */
	while ((__REG(UART_FR) & UART_TXFF) != 0 );
    __REG(UART_DR) = c;
    
	/* If \n, also do \r */
	if (c == '\n')
		serial_putc('\r');
}


/*******************************************************************************
 * Function: 
 * Description: ²âÊÔ½ÓÊÕ FIFO ÖÐÊÇ·ñÓÐÊý¾Ý£» Test whether a character is in the RX buffer
 * Parameters: 
 *   Input:
 *
 *   Output:
 *
 * Returns: 
 *
 *
 * Others: 
 ********************************************************************************/
int serial_tstc(void)
{
    if( __REG(UART_FR) & UART_RXFE )
        return 0;       //µÈÓÚ1ʱ£¬½ÓÊÕFIFOΪ¿Õ£¬Ã»ÓÐÊý¾Ý
    else
        return 1;       //µÈÓÚ0ʱ£¬½ÓÊÕFIFO²»Îª¿Õ£¬ÓÐÊý¾Ý;
}


/*******************************************************************************
 * Function: 
 * Description: 
 * Parameters: 
 *   Input:
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 *
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 *
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 ********************************************************************************/
void serial_puts(const char *s)
{
	while (*s)
		serial_putc(*s++);
}
/*******************************************************************************
 * Function: 
 * Description: 
 * Parameters: 
 *   Input:
 *
 *   Output:
 *
 * Returns: 
 *
 *
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 ********************************************************************************/

int UART_Read(char *pchBuf, int dwLen)
{
    int i = 0;
	for(i=0;i<dwLen;i++)
	{
	    pchBuf[i] = (char)serial_getc();
	}

	return dwLen;
}

/*******************************************************************************
 * Function: 
 * Description: 
 * Parameters: 
 *   Input:
 *
 *   Output:
 *
 * Returns: 
 *
 *
 * Others: 
 ********************************************************************************/

int UART_Write(char *pchBuf, int dwLen)

{
	int i = 0;
	for(i=0;i<dwLen;i++)
	{
	    serial_putc(pchBuf[i]);
	}

	return dwLen;
}


int UART_CmdRead(char *pchBuf, int dwLen)
{
    int i = 0;
	for(i=0;i<64;i++)
	{
	    pchBuf[i] = (char)serial_getc();
		if(pchBuf[i] == 0)
			break;
	}

	return (i+1);
}