/*------------------------------------------------------------------------*/
/* STM32F100: MMCv3/SDv1/SDv2 (SPI mode) control module                   */
/*------------------------------------------------------------------------*/
/*
/  Copyright (C) 2018, ChaN, all right reserved.
/
/ * This software is a free software and there is NO WARRANTY.
/ * No restriction on use. You can use, modify and redistribute it for
/   personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.
/ * Redistributions of source code must retain the above copyright notice.
/
/-------------------------------------------------------------------------*/


/*--------------------------------------------------------------------------
   Module Private Functions
---------------------------------------------------------------------------*/

#include "ost_hal.h"

#include "ff.h"
#include "diskio.h"

#define	MMC_CD		1	/* Card detect (yes:true, no:false, default:true) */
#define	MMC_WP		0 /* Write protected (yes:true, no:false, default:false) */


/* MMC card type flags (MMC_GET_TYPE) */ 
#define CT_MMC3		0x01		/* MMC ver 3 */ 
#define CT_MMC4		0x02		/* MMC ver 4+ */ 
#define CT_MMC		0x03		/* MMC */ 
#define CT_SDC1		0x02		/* SDC ver 1 */ 
#define CT_SDC2		0x04		/* SDC ver 2+ */ 
#define CT_SDC		0x0C		/* SDC */ 
#define CT_BLOCK	0x10		/* Block addressing */ 

/* MMC/SD command */
#define CMD0	(0)			/* GO_IDLE_STATE */
#define CMD1	(1)			/* SEND_OP_COND (MMC) */
#define	ACMD41	(0x80+41)	/* SEND_OP_COND (SDC) */
#define CMD8	(8)			/* SEND_IF_COND */
#define CMD9	(9)			/* SEND_CSD */
#define CMD10	(10)		/* SEND_CID */
#define CMD12	(12)		/* STOP_TRANSMISSION */
#define ACMD13	(0x80+13)	/* SD_STATUS (SDC) */
#define CMD16	(16)		/* SET_BLOCKLEN */
#define CMD17	(17)		/* READ_SINGLE_BLOCK */
#define CMD18	(18)		/* READ_MULTIPLE_BLOCK */
#define CMD23	(23)		/* SET_BLOCK_COUNT (MMC) */
#define	ACMD23	(0x80+23)	/* SET_WR_BLK_ERASE_COUNT (SDC) */
#define CMD24	(24)		/* WRITE_BLOCK */
#define CMD25	(25)		/* WRITE_MULTIPLE_BLOCK */
#define CMD32	(32)		/* ERASE_ER_BLK_START */
#define CMD33	(33)		/* ERASE_ER_BLK_END */
#define CMD38	(38)		/* ERASE */
#define CMD55	(55)		/* APP_CMD */
#define CMD58	(58)		/* READ_OCR */


static volatile DSTATUS Stat = STA_NOINIT;	/* Physical drive status */
static volatile UINT Timer1, Timer2;		/* 1kHz decrement timer stopped at zero (disk_timerproc()) */

static BYTE CardType;	/* Card type flags */


/*-----------------------------------------------------------------------*/
/* Wait for card ready                                                   */
/*-----------------------------------------------------------------------*/

static int wait_ready (	/* 1:Ready, 0:Timeout */
	UINT wt			/* Timeout [ms] */
)
{
	BYTE d;


	Timer2 = wt;
	do {
		d = sdcard_spi_transfer(0xFF);
		/* This loop takes a time. Insert rot_rdq() here for multitask envilonment. */
	} while (d != 0xFF && Timer2);	/* Wait for card goes ready or timeout */

	return (d == 0xFF) ? 1 : 0;
}



/*-----------------------------------------------------------------------*/
/* Deselect card and release SPI                                         */
/*-----------------------------------------------------------------------*/

static void deselect (void)
{
	sdcard_cs_high();		/* Set CS# high */
	sdcard_spi_transfer(0xFF);	/* Dummy clock (force DO hi-z for multiple slave SPI) */

}



/*-----------------------------------------------------------------------*/
/* Select card and wait for ready                                        */
/*-----------------------------------------------------------------------*/

static int select (void)	/* 1:OK, 0:Timeout */
{
	sdcard_cs_low();		/* Set CS# low */
	sdcard_spi_transfer(0xFF);	/* Dummy clock (force DO enabled) */
	if (wait_ready(500)) return 1;	/* Wait for card ready */

	deselect();
	return 0;	/* Timeout */
}



/*-----------------------------------------------------------------------*/
/* Receive a data packet from the MMC                                    */
/*-----------------------------------------------------------------------*/

static int rcvr_datablock (	/* 1:OK, 0:Error */
	BYTE *buff,				/* Data buffer */
	UINT btr				/* Data block length (byte) */
)
{
	BYTE token;


	Timer1 = 200;
	do {							/* Wait for DataStart token in timeout of 200ms */
		token = sdcard_spi_transfer(0xFF);
		/* This loop will take a time. Insert rot_rdq() here for multitask envilonment. */
	} while ((token == 0xFF) && Timer1);
	if(token != 0xFE) return 0;		/* Function fails if invalid DataStart token or timeout */

	sdcard_spi_recv_multi(buff, btr);		/* Store trailing data to the buffer */
	sdcard_spi_transfer(0xFF); sdcard_spi_transfer(0xFF);			/* Discard CRC */

	return 1;						/* Function succeeded */
}


/*-----------------------------------------------------------------------*/
/* Send a command packet to the MMC                                      */
/*-----------------------------------------------------------------------*/

static BYTE send_cmd (	/* Return value: R1 resp (bit7==1:Failed to send) */
	BYTE cmd,			/* Command index */
	DWORD arg			/* Argument */
)
{
	BYTE n, res;


	if (cmd & 0x80) {	/* Send a CMD55 prior to ACMD<n> */
		cmd &= 0x7F;
		res = send_cmd(CMD55, 0);
		if (res > 1) return res;
	}

	/* Select the card and wait for ready except to stop multiple block read */
	if (cmd != CMD12) {
		deselect();
		if (!select()) return 0xFF;
	}

	/* Send command packet */
	sdcard_spi_transfer(0x40 | cmd);				/* Start + command index */
	sdcard_spi_transfer((BYTE)(arg >> 24));		/* Argument[31..24] */
	sdcard_spi_transfer((BYTE)(arg >> 16));		/* Argument[23..16] */
	sdcard_spi_transfer((BYTE)(arg >> 8));			/* Argument[15..8] */
	sdcard_spi_transfer((BYTE)arg);				/* Argument[7..0] */
	n = 0x01;							/* Dummy CRC + Stop */
	if (cmd == CMD0) n = 0x95;			/* Valid CRC for CMD0(0) */
	if (cmd == CMD8) n = 0x87;			/* Valid CRC for CMD8(0x1AA) */
	sdcard_spi_transfer(n);

	/* Receive command resp */
	if (cmd == CMD12) sdcard_spi_transfer(0xFF);	/* Diacard following one byte when CMD12 */
	n = 10;								/* Wait for response (10 bytes max) */
	do {
		res = sdcard_spi_transfer(0xFF);
	} while ((res & 0x80) && --n);

	return res;							/* Return received response */
}



/*--------------------------------------------------------------------------
   Public Functions
---------------------------------------------------------------------------*/


/*-----------------------------------------------------------------------*/
/* Initialize disk drive                                                 */
/*-----------------------------------------------------------------------*/

DSTATUS disk_initialize (
	BYTE drv		/* Physical drive number (0) */
)
{
	BYTE n, cmd, ty, ocr[4];

	if (drv) return STA_NOINIT;			/* Supports only drive 0 */

	if (Stat & STA_NODISK) return Stat;	/* Is card existing in the soket? */

	sdcard_set_slow_clock();
	for (n = 10; n; n--) sdcard_spi_transfer(0xFF);	/* Send 80 dummy clocks */

	ty = 0;
	if (send_cmd(CMD0, 0) == 1) {			/* Put the card SPI/Idle state */
		Timer1 = 1000;						/* Initialization timeout = 1 sec */
		if (send_cmd(CMD8, 0x1AA) == 1) {	/* SDv2? */

			for (n = 0; n < 4; n++) ocr[n] = sdcard_spi_transfer(0xFF);	/* Get 32 bit return value of R7 resp */
			if (ocr[2] == 0x01 && ocr[3] == 0xAA) {				/* Is the card supports vcc of 2.7-3.6V? */
				while (Timer1 && send_cmd(ACMD41, 1UL << 30)) ;	/* Wait for end of initialization with ACMD41(HCS) */
				if (Timer1 && send_cmd(CMD58, 0) == 0) {		/* Check CCS bit in the OCR */
					for (n = 0; n < 4; n++) ocr[n] = sdcard_spi_transfer(0xFF);
					ty = (ocr[0] & 0x40) ? CT_SDC2 | CT_BLOCK : CT_SDC2;	/* Card id SDv2 */
				}
			}
		} else {	/* Not SDv2 card */

			if (send_cmd(ACMD41, 0) <= 1) 	{	/* SDv1 or MMC? */
				ty = CT_SDC1; cmd = ACMD41;	/* SDv1 (ACMD41(0)) */
			} else {
				ty = CT_MMC3; cmd = CMD1;	/* MMCv3 (CMD1(0)) */
			}
			while (Timer1 && send_cmd(cmd, 0)) ;		/* Wait for end of initialization */
			if (!Timer1 || send_cmd(CMD16, 512) != 0)	/* Set block length: 512 */
				ty = 0;
		}
	}
	
	CardType = ty;	/* Card type */
	deselect();

	if (ty) {			/* OK */
		sdcard_set_fast_clock();			/* Set fast clock */
		Stat &= ~STA_NOINIT;	/* Clear STA_NOINIT flag */
	} else {			/* Failed */
		Stat = STA_NOINIT;
	}

	return Stat;
}



/*-----------------------------------------------------------------------*/
/* Get disk status                                                       */
/*-----------------------------------------------------------------------*/

DSTATUS disk_status (
	BYTE drv		/* Physical drive number (0) */
)
{
	if (drv) return STA_NOINIT;		/* Supports only drive 0 */

	return Stat;	/* Return disk status */
}



/*-----------------------------------------------------------------------*/
/* Read sector(s)                                                        */
/*-----------------------------------------------------------------------*/

DRESULT disk_read (
	BYTE drv,		/* Physical drive number (0) */
	BYTE *buff,		/* Pointer to the data buffer to store read data */
	LBA_t sector,	/* Start sector number (LBA) */
	UINT count		/* Number of sectors to read (1..128) */
)
{
	DWORD sect = (DWORD)sector;


	if (drv || !count) return RES_PARERR;		/* Check parameter */
	if (Stat & STA_NOINIT) return RES_NOTRDY;	/* Check if drive is ready */

	if (!(CardType & CT_BLOCK)) sect *= 512;	/* LBA ot BA conversion (byte addressing cards) */

	if (count == 1) {	/* Single sector read */
		if ((send_cmd(CMD17, sect) == 0)	/* READ_SINGLE_BLOCK */
			&& rcvr_datablock(buff, 512)) {
			count = 0;
		}
	}
	else {				/* Multiple sector read */
		if (send_cmd(CMD18, sect) == 0) {	/* READ_MULTIPLE_BLOCK */
			do {
				if (!rcvr_datablock(buff, 512)) break;
				buff += 512;
			} while (--count);
			send_cmd(CMD12, 0);				/* STOP_TRANSMISSION */
		}
	}
	deselect();

	return count ? RES_ERROR : RES_OK;	/* Return result */
}


/*-----------------------------------------------------------------------*/
/* Miscellaneous drive controls other than data read/write               */
/*-----------------------------------------------------------------------*/

DRESULT disk_ioctl (
	BYTE drv,		/* Physical drive number (0) */
	BYTE cmd,		/* Control command code */
	void *buff		/* Pointer to the conrtol data */
)
{
	DRESULT res;
	BYTE n, csd[16];
	DWORD st, ed, csize;
	LBA_t *dp;


	if (drv) return RES_PARERR;					/* Check parameter */
	if (Stat & STA_NOINIT) return RES_NOTRDY;	/* Check if drive is ready */

	res = RES_ERROR;

	switch (cmd) {
	case CTRL_SYNC :		/* Wait for end of internal write process of the drive */
		if (select()) res = RES_OK;
		break;

	case GET_SECTOR_COUNT :	/* Get drive capacity in unit of sector (DWORD) */
		if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16)) {
			if ((csd[0] >> 6) == 1) {	/* SDC CSD ver 2 */
				csize = csd[9] + ((WORD)csd[8] << 8) + ((DWORD)(csd[7] & 63) << 16) + 1;
				*(LBA_t*)buff = csize << 10;
			} else {					/* SDC CSD ver 1 or MMC */
				n = (csd[5] & 15) + ((csd[10] & 128) >> 7) + ((csd[9] & 3) << 1) + 2;
				csize = (csd[8] >> 6) + ((WORD)csd[7] << 2) + ((WORD)(csd[6] & 3) << 10) + 1;
				*(LBA_t*)buff = csize << (n - 9);
			}
			res = RES_OK;
		}
		break;

	case GET_BLOCK_SIZE :	/* Get erase block size in unit of sector (DWORD) */
		if (CardType & CT_SDC2) {	/* SDC ver 2+ */
			if (send_cmd(ACMD13, 0) == 0) {	/* Read SD status */
				sdcard_spi_transfer(0xFF);
				if (rcvr_datablock(csd, 16)) {				/* Read partial block */
					for (n = 64 - 16; n; n--) sdcard_spi_transfer(0xFF);	/* Purge trailing data */
					*(DWORD*)buff = 16UL << (csd[10] >> 4);
					res = RES_OK;
				}
			}
		} else {					/* SDC ver 1 or MMC */
			if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16)) {	/* Read CSD */
				if (CardType & CT_SDC1) {	/* SDC ver 1.XX */
					*(DWORD*)buff = (((csd[10] & 63) << 1) + ((WORD)(csd[11] & 128) >> 7) + 1) << ((csd[13] >> 6) - 1);
				} else {					/* MMC */
					*(DWORD*)buff = ((WORD)((csd[10] & 124) >> 2) + 1) * (((csd[11] & 3) << 3) + ((csd[11] & 224) >> 5) + 1);
				}
				res = RES_OK;
			}
		}
		break;

	case CTRL_TRIM :	/* Erase a block of sectors (used when _USE_ERASE == 1) */
		if (!(CardType & CT_SDC)) break;				/* Check if the card is SDC */
		if (disk_ioctl(drv, MMC_GET_CSD, csd)) break;	/* Get CSD */
		if (!(csd[10] & 0x40)) break;					/* Check if ERASE_BLK_EN = 1 */
		dp = buff; st = (DWORD)dp[0]; ed = (DWORD)dp[1];	/* Load sector block */
		if (!(CardType & CT_BLOCK)) {
			st *= 512; ed *= 512;
		}
		if (send_cmd(CMD32, st) == 0 && send_cmd(CMD33, ed) == 0 && send_cmd(CMD38, 0) == 0 && wait_ready(30000)) {	/* Erase sector block */
			res = RES_OK;	/* FatFs does not check result of this command */
		}
		break;

	/* Following commands are never used by FatFs module */

	case MMC_GET_TYPE:		/* Get MMC/SDC type (BYTE) */
		*(BYTE*)buff = CardType;
		res = RES_OK;
		break;

	case MMC_GET_CSD:		/* Read CSD (16 bytes) */
		if (send_cmd(CMD9, 0) == 0 && rcvr_datablock((BYTE*)buff, 16)) {	/* READ_CSD */
			res = RES_OK;
		}
		break;

	case MMC_GET_CID:		/* Read CID (16 bytes) */
		if (send_cmd(CMD10, 0) == 0 && rcvr_datablock((BYTE*)buff, 16)) {	/* READ_CID */
			res = RES_OK;
		}
		break;

	case MMC_GET_OCR:		/* Read OCR (4 bytes) */
		if (send_cmd(CMD58, 0) == 0) {	/* READ_OCR */
			for (n = 0; n < 4; n++) *(((BYTE*)buff) + n) = sdcard_spi_transfer(0xFF);
			res = RES_OK;
		}
		break;

	case MMC_GET_SDSTAT:	/* Read SD status (64 bytes) */
		if (send_cmd(ACMD13, 0) == 0) {	/* SD_STATUS */
			sdcard_spi_transfer(0xFF);
			if (rcvr_datablock((BYTE*)buff, 64)) res = RES_OK;
		}
		break;

	default:
		res = RES_PARERR;
	}

	deselect();

	return res;
}



/*-----------------------------------------------------------------------*/
/* Device timer function                                                 */
/*-----------------------------------------------------------------------*/
/* This function must be called from timer interrupt routine in period
/  of 1 ms to generate card control timing.
*/

void disk_timerproc (void)
{
	WORD n;
	BYTE s;


	n = Timer1;						/* 1kHz decrement timer stopped at 0 */
	if (n) Timer1 = --n;
	n = Timer2;
	if (n) Timer2 = --n;

	s = Stat;
	if (MMC_WP) {	/* Write protected */
		s |= STA_PROTECT;
	} else {		/* Write enabled */
		s &= ~STA_PROTECT;
	}
	if (MMC_CD) {	/* Card is in socket */
		s &= ~STA_NODISK;
	} else {		/* Socket empty */
		s |= (STA_NODISK | STA_NOINIT);
	}
	Stat = s;
}