/****************************************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 鄭明遠** Created date: 			2006.01.09** Version: 				V1.0** Descriptions:			The original version 初始版本****------------------------------------------------------------------------------------------------------** Modified by:** Modified date:** Version:** Description:**********************************************************************************************************/#include "config.h"/*********************************************************************************************************** Function name: SD_HardWareInit** Descriptions:  initialize the hardware condiction that access sd card**                初始化訪問SD卡的硬件條件	** Input: 		  NULL	** Output: 		  NULL** Created by:    Ming Yuan Zheng 鄭明遠 ** Created Date:  2006-01-09 **-------------------------------------------------------------------------------------------------------** Modified by:** Modified Date: **------------------------------------------------------------------------------------------------------********************************************************************************************************/void SD_HardWareInit(void){ 	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 */			SD_Powerup();					/* supply power to sd/mmc card */	SD_Clk400k();					/* set the clock(read and write sd/mmc) to 40KHz */}/*********************************************************************************************************** Function name: SD_Powerup** Descriptions:  supply power to sd/mmc card**                給 sd/mmc 卡上電** Input: 		  NULL	** Output: 		  NULL** Created by:    Ming Yuan Zheng 鄭明遠  ** Created Date:  2006-01-09**-------------------------------------------------------------------------------------------------------** Modified by:** Modified Date: **------------------------------------------------------------------------------------------------------********************************************************************************************************/void SD_Powerup(void){	/* Set block size to 512 bytes  設置塊大小為512字節 */	SDIBSIZE = SD_BLOCKSIZE;	/* Set timeout count 設置超時計數器 */	SDIDTIMER = 0xffff;	/* Disable SDI interrupt 關閉SDI中斷 */	SDIIMSK = 0x0;	/* Type B, FIFO reset, SD clock enable 數據傳輸類型為B, FIFO復位, 時鐘使能 */	SDICON = SDICON_LE | SDICON_FRESET | SDICON_ENCLK;	/* clear all bits of SDIDSTA register 清除SDI數據狀態寄存器所有的位 */	SDIDSTA = SDIDSTA_ALL;	/* delay */	mdelay(125);}/*********************************************************************************************************** Function name: set_clock** Descriptions:  set the clock for read and write sd/mmc card**                設置讀寫SD卡的頻率值** Input: 		  int rate: frequency value   頻率值	** Output: 		  NULL** Created by:    Ming Yuan Zheng 鄭明遠  ** 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;					 /* 最大時鐘為20MHz */	    /* read s3c2410 PCLK */  	pclk = s3c2410_get_bus_clk(GET_PCLK);			 /* 讀取PCLK時鐘 */			/* calculate the clock that operate sd/mmc*/	val = (pclk / 2 / (rate));						 /* 計算操作sd/mmc卡的時鐘 */		/* write the value to prescaler register */  	SDIPRE = (SDIPRE_MSK & val); 					 /* 將頻率值寫入分頻寄存器 */}/*********************************************************************************************************** Function name: SD_Clk400k** Descriptions:  set the clock(read or write sd/mmc) to 400KHz**                設置訪問sd/mmc的速度為400KHz** Input: 		  NULL	** Output: 		  NULL** Created by:    Ming Yuan Zheng 鄭明遠  ** Created Date:  2006-01-09**-------------------------------------------------------------------------------------------------------** Modified by:** Modified Date: **------------------------------------------------------------------------------------------------------********************************************************************************************************/void SD_Clk400k(void){	set_clock(400000);								/* 400K Hz */}/*********************************************************************************************************** Function name: SD_ClkToMax** Descriptions:  set the clock(read or write sd/mmc) to max**                設置訪問sd/mmc的速度到最高** Input: 		  NULL	** Output: 		  NULL** Created by:    Ming Yuan Zheng 鄭明遠  ** Created Date:  2006-01-09**-------------------------------------------------------------------------------------------------------** Modified by:** Modified Date: **------------------------------------------------------------------------------------------------------********************************************************************************************************/void SD_ClkToMax(void){	set_clock(MMC_MMC_CLOCK_HIGH);			  		/* Max frequency */}