/*
 * shimatta_sdio-driver.c
 *
 *  Created on: Apr 30, 2015
 *  Mario Hüttel
 */

#include "shimatta_sdio.h"
#include "shimatta_sdio_config.h"

#define SETAF(PORT,PIN,AF)  PORT->AFR[(PIN < 8 ? 0 : 1)] |= AF << ((PIN < 8 ? PIN : (PIN - 8)) * 4)

#define READCTRL ((BLOCKSIZE << 4) | SDIO_DCTRL_DMAEN)
#define DMAP2M (DMA_SxCR_CHSEL_2 | DMA_SxCR_PBURST_0 | DMA_SxCR_MBURST_0 | DMA_SxCR_MSIZE_1 | DMA_SxCR_PSIZE_1 | DMA_SxCR_MINC | DMA_SxCR_PFCTRL)
#define DMAM2P (DMA_SxCR_CHSEL_2 | DMA_SxCR_PBURST_0 | DMA_SxCR_MBURST_0 | DMA_SxCR_MSIZE_1 | DMA_SxCR_PSIZE_1 | DMA_SxCR_MINC | DMA_SxCR_PFCTRL | DMA_SxCR_DIR_0)
#define SHORT_ANS 1
#define LONG_ANS 3
#define NO_ANS 0


#define CCRCFAIL 1
#define CTIMEOUT 2

/* OCR Register Masks */
#define OCS_CCS (1<<30)
#define OCS_BUSY (1<<31)

typedef enum {ACMD41_RESP_INIT, ACMD41_RESP_ERR, ACMD41_RESP_SDSC, ACMD41_RESP_SDXC} ACMD41_RESP_t;
typedef enum {CMD8_RESP_TIMEOUT, CMD8_VOLTAGE_ACCEPTED, CMD8_VOLTAGE_DENIED} CMD8_RESP_t;
typedef uint8_t CID_t;

void SDIO_init_hw();

int SDIO_send_cmd(uint8_t CMD, uint32_t arg, uint8_t expectedAns);
int SDIO_get_response(uint8_t expectedCMD, uint8_t typeOfAns, uint32_t* responseBuffer);


void SDIO_wait_cmd_sent();
ACMD41_RESP_t SDIO_init_card_ACMD41(uint8_t HCS);
int SDIO_switch_appmode_CMD55();
int SDIO_send_all_send_cid_CMD2();
int SDIO_send_relative_address_CMD3(uint16_t* rca);
int SDIO_send_go_idle_CMD0();
CMD8_RESP_t SDIO_send_iface_condition_CMD8();
int SDIO_send_block_length_CMD16(uint32_t blocklen);
int SDIO_send_bus_width_ACMD6(uint8_t bus_width);

void SDIO_init_detect_pins();
int checkNotInserted(); // Returns 0 if inserted!
int checkWriteProtection(); // returns 0 if write protected
void switchPrescaler(uint8_t clkdiv);

//BYTE rxtxbuffer[1<<BLOCKSIZE]; //Data RX and TX Buffer not needed anymore. thanks to DMA
SDInfo_t card_info; // = {.type = CARD_NONE};

DSTATUS SDIO_status(){
	DSTATUS returnval = 0;
	if (checkNotInserted()) {
		returnval |= STA_NODISK;
	}
	if (card_info.type == CARD_NONE) {
		returnval |= STA_NOINIT;
	}
	if (checkWriteProtection()) {
		returnval |= STA_PROTECT;
	}
	return returnval;
}


DSTATUS SDIO_initialize(){
	int timeout = 200;
	CMD8_RESP_t res8;
	ACMD41_RESP_t resa41;
	uint8_t hcs_flag = 0;
	card_info.rca = 0;
	card_info.type = CARD_NONE;
	card_type_t detected_card = CARD_NONE;

	SDIO_init_hw();
	SDIO_init_detect_pins();
	if (checkNotInserted()) {
		return STA_NOINIT | STA_NODISK;
	}


	SDIO_send_go_idle_CMD0();
	res8 = SDIO_send_iface_condition_CMD8();
	switch (res8) {
	case CMD8_VOLTAGE_ACCEPTED: // SDV2 Card
		hcs_flag = 1;
		break;
	case CMD8_VOLTAGE_DENIED: // should not happen
		return STA_NOINIT;
		break;
	case CMD8_RESP_TIMEOUT: // SDV1 Card
		hcs_flag=0;
		break;
	default:
		return STA_NOINIT;
		break;
	}

	do {
		resa41 = SDIO_init_card_ACMD41(hcs_flag);
	}while((resa41 == ACMD41_RESP_INIT) && (--timeout > 0));

	switch (resa41) {
	case ACMD41_RESP_SDSC:
		detected_card = (hcs_flag ? SD_V2_SC : SD_V1);
		break;
	case ACMD41_RESP_SDXC:
		detected_card = SD_V2_HC;
		break;
	default:
		return STA_NOINIT;
		break;
	}

	if (SDIO_send_all_send_cid_CMD2())
		return STA_NOINIT;
	if (SDIO_send_relative_address_CMD3(&card_info.rca))
		return STA_NOINIT;
	if (SDIO_send_block_length_CMD16((uint32_t)(1<<BLOCKSIZE)))
		return STA_NOINIT;
	if (SDIO_send_bus_width_ACMD6(BUSWIDTH))
		return STA_NOINIT;


	switchPrescaler(WORKCLK);


	card_info.type = detected_card;
	if (checkWriteProtection()) {
		return STA_PROTECT;
	} else
		return 0;
}
DRESULT SDIO_disk_read(BYTE *buff, DWORD sector, UINT count){
	return RES_ERROR;
}
DRESULT SDIO_disk_write(const BYTE *buff, DWORD sector, UINT count){
	return RES_ERROR;
}
DRESULT SDIO_disk_ioctl(BYTE cmd, void* buff){
	DRESULT res = RES_OK;
	switch(cmd) {
	case GET_BLOCK_SIZE:
		*((DWORD*)buff) = (DWORD)0x01;
		break;
	case GET_SECTOR_SIZE:
		*((WORD*)buff) = (WORD)(1<<BLOCKSIZE);
		break;
	case GET_SECTOR_COUNT:
		res = RES_ERROR;
		//TODO: Implement
		break;
	case CTRL_SYNC:
		res = RES_OK;
		//No cache
		//Nothing to do
		break;
	default:
		res = RES_PARERR;
		break;
	}
	return res;
}

DWORD __attribute__((weak)) get_fattime(){
	return (1<<16) | (1<<24); // return Jan. 1st 1980 00:00:00
}

void SDIO_init_hw(){
	//Init Clocks
	RCC->AHB1ENR    |= PORTCLKMASK;
	RCC->APB2ENR    |= RCC_APB2ENR_SDIOEN;
	//Init Alternate Functions
	CLKPORT->MODER  |= (2<<CLKPIN*2);
	D0PORT->MODER   |= (2<<D0PIN*2);
	D0PORT->PUPDR   |= (1<<D0PIN*2);
	CMDPORT->MODER  |= (2<<CMDPIN*2);
	CMDPORT->PUPDR	|= (1<<CMDPIN*2);
#if BUSWIDTH==4
	D1PORT->MODER   |= (2<<D1PIN*2);
	D1PORT->PUPDR   |= (1<<D1PIN*2);
	D2PORT->MODER   |= (2<<D2PIN*2);
	D2PORT->PUPDR   |= (1<<D2PIN*2);
	D3PORT->MODER   |= (2<<D3PIN*2);
	D3PORT->PUPDR   |= (1<<D3PIN*2);
#endif
	//CLKPORT->AFR[(CLKPIN < 8 ? 0 : 1)] |= ALTFUNC << ((CLKPIN < 8 ? CLKPIN : (CLKPIN - 8)) * 4);
	SETAF(CLKPORT,  CLKPIN, ALTFUNC);
	SETAF(CMDPORT, CMDPIN, ALTFUNC);
	SETAF(D0PORT,   D0PIN,  ALTFUNC);
#if BUSWIDTH==4
	SETAF(D1PORT,   D1PIN,  ALTFUNC);
	SETAF(D2PORT,   D2PIN,  ALTFUNC);
	SETAF(D3PORT,   D3PIN,  ALTFUNC);
#endif


	//Init Module

	//Set CLK Control Register
	SDIO->CLKCR = (HW_FLOW<<14) | ((BUSWIDTH == 4 ? 1 : 0)<<11) | SDIO_CLKCR_CLKEN |
			(INITCLK & SDIO_CLKCR_CLKDIV);

	//Set Data Timeout
	SDIO->DTIMER = DTIMEOUT;

	//Set Data Parameters
	//SDIO->DCTRL = (BLOCKSIZE << 4) | SDIO_DCTRL_DMAEN;
	//Set Power Register: Power up Card CLK
	SDIO->POWER = SDIO_POWER_PWRCTRL_0 | SDIO_POWER_PWRCTRL_1;

}

void switchPrescaler(uint8_t clkdiv) {
	uint32_t reg;
	reg = SDIO->CLKCR;
	reg &= ~SDIO_CLKCR_CLKDIV; // Clear prescaler
	reg |= (SDIO_CLKCR_CLKDIV & clkdiv); // Set bits
	SDIO->CLKCR = reg;
}

int SDIO_send_bus_width_ACMD6(uint8_t bus_width) {
	uint32_t response;
	int retry = 0x20;
	int ret;
	if (SDIO_switch_appmode_CMD55()) return -1;
	do {
		SDIO_send_cmd(0x6, (bus_width == 4 ? 0x2 : 0x0), SHORT_ANS);
		if (!(ret = SDIO_get_response(0x6, SHORT_ANS, &response)))
			return 0;

	} while(--retry > 0);
	return ret;

}


//Send Command
//Clear respone Flags
//->CRC Fail, complete response, Timeout
int SDIO_send_cmd(uint8_t CMD, uint32_t arg, uint8_t expectedAns){
	//Clear Flags
	SDIO->ICR = SDIO_ICR_CCRCFAILC | SDIO_ICR_CMDRENDC | SDIO_ICR_CTIMEOUTC | SDIO_ICR_CMDSENTC;
	//Send command
	SDIO->ARG = arg;
	SDIO->CMD = (CMD & SDIO_CMD_CMDINDEX) | SDIO_CMD_CPSMEN | /*SDIO_CMD_WAITPEND |*/ ((expectedAns << 6) & SDIO_CMD_WAITRESP);
	return 0;
}
unsigned int debug;
void SDIO_wait_cmd_sent() {
	while (!(SDIO->STA & SDIO_STA_CMDSENT))
	{
		debug = SDIO->STA;
	}
	SDIO->ICR |= SDIO_ICR_CMDSENTC;
}

int SDIO_get_response(uint8_t expectedCMD, uint8_t typeOfAns, uint32_t *responseBuffer) {
	//Wait for error or success
	while (1) {
		if (SDIO->STA & SDIO_STA_CMDREND) break; //Correct Respone Received
		if ((SDIO->STA & SDIO_STA_CMDSENT) && (typeOfAns == NO_ANS)) break; // No response required

		//Exclude ACMD41 and CMD2 from valid CRC check
		if ((SDIO->STA & SDIO_STA_CCRCFAIL)) {
			if(expectedCMD == 0xff) { // TODO: This seems odd..
				break;
			} else
				return -CCRCFAIL;
		}


		if (SDIO->STA & SDIO_STA_CTIMEOUT)
			return -CTIMEOUT;
	}
	//Valid Respone Received
	if (((SDIO->RESPCMD & SDIO_RESPCMD_RESPCMD) != expectedCMD) && expectedCMD != 0xff)
		return -1; //Not the expected respose

	//If case of a correct Response
	*(responseBuffer++) = SDIO->RESP1;
	//Long response.
	if (typeOfAns == LONG_ANS) {
		*(responseBuffer++) = SDIO->RESP2;
		*(responseBuffer++) = SDIO->RESP3;
		*(responseBuffer++) = SDIO->RESP4;
	}
	return 0;

}

int SDIO_switch_appmode_CMD55(){
	int retry = 0x20;
	StatusConv_t converter;
	uint32_t response;
	do {
		//Execute Command and check for valid response
		SDIO_send_cmd(55, card_info.rca, SHORT_ANS);

		if (!SDIO_get_response(55, SHORT_ANS, &response))
		{
			//Response valid. Check if Card has accepted switch to application command mode
			converter.value = response;
			if (converter.statusstruct.APP_CMD == 1)
				return 0;
		}
	}while(--retry > 0);

	return -1;
}

ACMD41_RESP_t SDIO_init_card_ACMD41(uint8_t HCS){
	uint32_t response;
	int retry = 0x20;
	if (SDIO_switch_appmode_CMD55()) return -1;

	do {

		SDIO_send_cmd(41, (HCS ? (1<<30) : 0) | (1<<28), SHORT_ANS);
		if (!SDIO_get_response(0xFF, SHORT_ANS, &response)) {
			if (response & OCS_BUSY) { // Card is ready... Who knows why this bit is called busy...
				if (response & OCS_CCS) {
					return ACMD41_RESP_SDXC;
				} else {
					return ACMD41_RESP_SDSC;
				}
			} else {
				return ACMD41_RESP_INIT;
			}

		}


	}while(--retry > 0);

	return ACMD41_RESP_ERR;
}

int SDIO_send_all_send_cid_CMD2() {
	uint32_t response[4];
	int ret;
	int retry = 0x20;
	do {
		SDIO_send_cmd(2, 0, LONG_ANS);
		if (!(ret = SDIO_get_response(0xFF, LONG_ANS, response))) return 0;
	}while(retry-- > 0);
	return ret;
}

int SDIO_send_relative_address_CMD3(uint16_t* rca) {
	uint32_t response;
	int retry = 0x20;
	do {
		SDIO_send_cmd(3, 0, SHORT_ANS);
		if (!SDIO_get_response(3, SHORT_ANS, &response)) {
			// TODO: Do some *optional* checking
			*rca = ((response & 0xFFFF0000) >> 16);
			return 0;
		}
	}while(retry-- > 0);
	return -1;
}

int SDIO_send_go_idle_CMD0() {
	SDIO_send_cmd(0, 0x0, NO_ANS);
	SDIO_wait_cmd_sent();
	return 0;
}

CMD8_RESP_t SDIO_send_iface_condition_CMD8() {
	uint32_t response;
	int res = 0;
	int retry = 0x20;
	do {
		SDIO_send_cmd(8, 0x1CC, SHORT_ANS); // 3.3V supply requesR
		res = SDIO_get_response(8, SHORT_ANS, &response);
		if (res == 0) {
			if (response & 0x100)
				return CMD8_VOLTAGE_ACCEPTED;
			else
				return CMD8_VOLTAGE_DENIED;
		}
	}while(retry-- > 0);
	return CMD8_RESP_TIMEOUT;
}

/**
 * @brief initDetectandProtectionPins
 */
void SDIO_init_detect_pins() {
#if SDIO_ENABLE_WRITEPROT==1
	WRITEPROT_PORT->PUPDR |= ((WRITEPROT_PULLUP ? 1 : 0)<<WRITEPROT_PIN*2);
#endif /* SDIO_ENABLE_WRITEPROT */
#if SDIO_ENABLE_INS==1
	INS_PORT->PUPDR |= ((INS_PULLUP? 1 : 0)<<INS_PIN*2);
#endif /* SDIO_ENABLE_INS */
	__DSB();
}

/**
 * @brief checkNotInserted
 * @return return 0 if card is inserted, else 1
 */
int checkNotInserted() {
#if SDIO_ENABLE_INS
	return ((INS_PORT->IDR & INS_PIN) == INS_ACTIVE_LEVEL ? 0 : 1);
#else
	return 0; // Assume Card is inserted
#endif
}

int SDIO_send_block_length_CMD16(uint32_t blocklen) {
	int timeout = 0x20;
	int res;
	uint32_t response;

	do {
		SDIO_send_cmd(16, (0x1<<BLOCKSIZE), SHORT_ANS);
		if (!(res = SDIO_get_response(16, SHORT_ANS, &response)))
			return 0;
	}while(--timeout > 0);

	return res;
}

/**
 * @brief checkWriteProtection
 * @return 0 if card is writable.
 */
int checkWriteProtection() {
#if SDIO_ENABLE_WRITEPROT
	return ((WRITEPROT_PORT->IDR & WRITEPROT_PIN) == WRITEPROT_ACTIVE_LEVEL ? 1 : 0);
#else
	return 0; // Assume Card is not write protected
#endif
}