sdhal.c

基于S3C2440处理器的sd卡驱动程序

/****************************************Copyright (c)**************************************************
**                               Guangzhou ZHIYUAN electronics Co.,LTD.
**                                     
**                                 http://www.zyinside.com
**
**--------------File Info-------------------------------------------------------------------------------
** File Name: 				sdconfig.h
** Last modified Date: 		2006.01.09
** Last Version:			V1.0		
** Description: 			hardware abstract layer for s3c2410 SD/MMC
**
**------------------------------------------------------------------------------------------------------
** Created By: 				Ming Yuan Zheng 郑明远
** Created date: 			2006.01.09
** Version: 				V1.0
** Descriptions:			The original version 初始版本
**
**------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Description:
**
********************************************************************************************************/


#include "sd_extr.h"

/*********************************************************************************************************
** Function name: SD_HardWareInit
** Descriptions:  initialize the hardware condiction that access sd card
**                初始化访问SD卡的硬件条件	
** Input: 		  NULL	
** Output: 		  NULL
** Created by:    Ming Yuan Zheng 郑明远 
** Created Date:  2006-01-09 
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
void SD_HardWareInit(void)
{ 
int i;
#if 0
	set_gpio_ctrl(GPIO_SDDAT3 | GPIO_MODE_SDDAT | GPIO_PULLUP_EN);  /* SDDAT3 is GPIO and pulled up */
	set_gpio_ctrl(GPIO_SDDAT2 | GPIO_MODE_SDDAT | GPIO_PULLUP_EN);  /* SDDAT2 is GPIO and pulled up */
	set_gpio_ctrl(GPIO_SDDAT1 | GPIO_MODE_SDDAT | GPIO_PULLUP_EN);  /* SDDAT1 is GPIO and pulled up */
	set_gpio_ctrl(GPIO_SDDAT0 | GPIO_MODE_SDDAT | GPIO_PULLUP_EN);	/* SDDAT0 is GPIO and pulled up */ 
	set_gpio_ctrl(GPIO_SDCMD | GPIO_MODE_SDCMD | GPIO_PULLUP_EN);   /* SDCMD is GPIO and pulled up */
	set_gpio_ctrl(GPIO_SDCLK | GPIO_MODE_SDCLK | GPIO_PULLUP_EN);   /* SDCLK is GPIO and pulled up */	
#endif

    GPEUP  = 0xf83f;     // SDCMD, SDDAT[3:0] => PU En.
    GPECON = 0xaaaaaaaa;	//SDCMD, SDDAT[3:0]

	//SD_Powerup();					/* supply power to sd/mmc card */
	//SD_Clk400k();					/* set the clock(read and write sd/mmc) to 40KHz */
	//SD_ClkToMax();
	SDIIMSK = 0x0;
	/* Type B,  SD clock enable 数据传输类型为B,  时钟使能 */
	//SDICON = SDICON_LE | SDICON_FRESET | SDICON_ENCLK;
	SDICON = 0;
	SDICON = (1<<4)|1;
	SDIFSTA= SDIFSTA|(1<<16); //FIFO reset,FIFO复位,
	/* clear all bits of SDIDSTA register 清除SDI数据状态寄存器所有的位 */
	//SDIDSTA = SDIDSTA_ALL;
	//SDIBSIZE =0x200;		// 512byte(128word)
	//SDIDTIMER=0x7fffff;		// Set timeout count
	/* delay */
	//mdelay(125);
	SD_ClkToMax();
    for(i=0;i<0x1000;i++);  // Wait 74SDCLK for MMC card
	
}


/*********************************************************************************************************
** Function name: SD_Powerup
** Descriptions:  supply power to sd/mmc card
**                给 sd/mmc 卡上电
** Input: 		  NULL	
** Output: 		  NULL
** Created by:    Ming Yuan Zheng 郑明远  
** Created Date:  2006-01-09
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
//1. Set SDICON to configure properly with clock & interrupt enable
//2. Set SDIPRE to configure with a proper value.
//3. Wait 74 SDCLK clock cycle in order to initialize the card.
void SD_Powerup(void)
{
	int i;
	/* Set block size to 512 bytes  设置块大小为512字节 */
	//SDIBSIZE = SD_BLOCKSIZE;

	/* Set timeout count 设置超时计数器 */
	//SDIDTIMER = 0xffff;

	/* Disable SDI interrupt 关闭SDI中断 */
	SDIIMSK = 0x0;
	/* Type B,  SD clock enable 数据传输类型为B,  时钟使能 */
	//SDICON = SDICON_LE | SDICON_FRESET | SDICON_ENCLK;
	SDICON = 0;
	SDICON = (1<<4)|1;
	SDIFSTA= SDIFSTA|(1<<16); //FIFO reset,FIFO复位,
	/* clear all bits of SDIDSTA register 清除SDI数据状态寄存器所有的位 */
	//SDIDSTA = SDIDSTA_ALL;
	//SDIBSIZE =0x200;		// 512byte(128word)
	//SDIDTIMER=0x7fffff;		// Set timeout count
	/* delay */
	//mdelay(125);
	SD_ClkToMax();
    for(i=0;i<0x1000;i++);  // Wait 74SDCLK for MMC card
}


/*********************************************************************************************************
** Function name: set_clock
** Descriptions:  set the clock for read and write sd/mmc card
**                设置读写SD卡的频率值
** Input: 		  int rate: frequency value   频率值	
** Output: 		  NULL
** Created by:    Ming Yuan Zheng 郑明远  
** Created Date:  2006-01-09
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
static void set_clock(int rate)
{
	unsigned long val, pclk;

	if (rate >= MMC_MMC_CLOCK_HIGH) 
		rate = MMC_MMC_CLOCK_HIGH;					 /* 最大时钟为20MHz */
	
    /* read s3c2410 PCLK */ 
 	//pclk = s3c2410_get_bus_clk(GET_PCLK);			 /* 读取PCLK时钟 */	
 	pclk = 296352000;
	
	/* calculate the clock that operate sd/mmc*/
	//val = (pclk / 2 / (rate));						 /* 计算操作sd/mmc卡的时钟 */
	val = pclk / rate -1;
	
	/* write the value to prescaler register */  
	//SDIPRE = (SDIPRE_MSK & val); 					 /* 将频率值写入分频寄存器 */
	SDIPRE = val;
}


/*********************************************************************************************************
** Function name: SD_Clk400k
** Descriptions:  set the clock(read or write sd/mmc) to 400KHz
**                设置访问sd/mmc的速度为400KHz
** Input: 		  NULL	
** Output: 		  NULL
** Created by:    Ming Yuan Zheng 郑明远  
** Created Date:  2006-01-09
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
void SD_Clk400k(void)
{
	set_clock(4000000);								/* 400K Hz */
}


/*********************************************************************************************************
** Function name: SD_ClkToMax
** Descriptions:  set the clock(read or write sd/mmc) to max
**                设置访问sd/mmc的速度到最高
** Input: 		  NULL	
** Output: 		  NULL
** Created by:    Ming Yuan Zheng 郑明远  
** Created Date:  2006-01-09
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
void SD_ClkToMax(void)
{
	set_clock(MMC_MMC_CLOCK_HIGH);			  		/* Max frequency */
}