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#include <stdlib.h>
#include <stdint.h>
#include "eos.h"
#include "timer.h"
#include "spi.h"
#include "spi_dev.h"
#include "sdcard.h"
#define SDC_POLY_CRC7 0x09
#define SDC_POLY_CRC16 0x1021
#define SDC_CMD_FLAG_CRC 0x01
#define SDC_CMD_FLAG_NOCS 0x02
#define SDC_CMD_FLAG_SKIP 0x08
#define SDC_TOKEN_START_BLK 0xfe
#define SDC_TOKEN_START_BLKM 0xfc
#define SDC_TOKEN_STOP_TRAN 0xfd
#define SDC_R1_READY 0x00
#define SDC_R1_IDLE_STATE 0x01
#define SDC_R1_ERASE_RESET 0x02
#define SDC_R1_ILLEGAL_CMD 0x04
#define SDC_R1_ERR_CMD_CRC 0x08
#define SDC_R1_ERR_ERASE_SEQ 0x10
#define SDC_R1_ERR_ADDR 0x20
#define SDC_R1_ERR_PARAM 0x40
#define SDC_NCR 10
#define SDC_TYPE_MMC 1
#define SDC_TYPE_SDC1 2
#define SDC_TYPE_SDC2 3
#define SDC_ERR(rv) ((rv < 0) ? rv : EOS_ERR)
/* CMD */
#define GO_IDLE_STATE 0
#define SEND_OP_COND 1
#define SEND_IF_COND 8
#define SET_BLOCKLEN 16
#define APP_CMD 55
#define READ_OCR 58
/* ACMD */
#define SD_APP_OP_COND 41
static uint8_t sdc_crc7(uint8_t crc, uint8_t b) {
int i;
for (i=8; i--; b<<=1) {
crc <<= 1;
if ((b ^ crc) & 0x80) crc ^= SDC_POLY_CRC7;
}
return crc & 0x7f;
}
static uint16_t sdc_crc16(uint16_t crc, uint8_t b) {
int i;
crc = crc ^ ((uint16_t)b << 8);
for (i=8; i--;) {
if (crc & 0x8000) {
crc = (crc << 1) ^ SDC_POLY_CRC16;
} else {
crc <<= 1;
}
}
return crc;
}
static uint32_t sdc_nto(uint64_t start, uint32_t timeout) {
uint32_t d = eos_time_since(start);
return (d > timeout) ? 0 : timeout - d;
}
static void sdc_xchg(unsigned char *buffer, uint16_t len) {
}
static uint8_t sdc_xchg8(uint8_t data) {
return eos_spi_xchg8(data, 0);
}
static uint16_t sdc_xchg16(uint16_t data) {
return eos_spi_xchg16(data, 0);
}
static uint32_t sdc_xchg32(uint32_t data) {
return eos_spi_xchg32(data, 0);
}
static void sdc_select(void) {
eos_spi_cs_set();
eos_spi_xchg8(0xff, 0);
}
static void sdc_deselect(void) {
eos_spi_cs_clear();
eos_spi_xchg8(0xff, 0);
}
static int sdc_xchg_cmd(uint8_t cmd, uint32_t arg, uint8_t flags) {
int i;
uint8_t ret;
uint8_t crc = 0x7f;
cmd |= 0x40;
if (flags & SDC_CMD_FLAG_CRC) {
crc = sdc_crc7(0, cmd);
crc = sdc_crc7(crc, arg >> 24);
crc = sdc_crc7(crc, arg >> 16);
crc = sdc_crc7(crc, arg >> 8);
crc = sdc_crc7(crc, arg);
}
crc = (crc << 1) | 0x01;
sdc_xchg8(cmd);
sdc_xchg32(arg);
sdc_xchg8(crc);
if (flags & SDC_CMD_FLAG_SKIP) sdc_xchg8(0xff);
i = SDC_NCR;
do {
ret = sdc_xchg8(0xff);
} while ((ret & 0x80) && --i);
if (ret & 0x80) return EOS_ERR_BUSY;
return ret;
}
static int sdc_ready(uint32_t timeout) {
uint8_t d = 0;
uint64_t start;
if (timeout == 0) return EOS_ERR_BUSY;
start = eos_time_get_tick();
do {
if (eos_time_since(start) > timeout) break;
d = sdc_xchg8(0xff);
} while (d != 0xff);
if (d != 0xff) return EOS_ERR_BUSY;
return EOS_OK;
}
static int sdc_block_read(uint8_t *buffer, uint16_t len, uint32_t timeout) {
uint8_t token = 0xff;
uint64_t start;
if (timeout == 0) return EOS_ERR_BUSY;
start = eos_time_get_tick();
do {
if (eos_time_since(start) > timeout) break;
token = sdc_xchg8(0xff);
} while (token == 0xff);
if (token == 0xff) return EOS_ERR_BUSY;
if (token != SDC_TOKEN_START_BLK) return EOS_ERR;
sdc_xchg(buffer, len);
sdc_xchg16(0xff); /* dummy CRC */
return EOS_OK;
}
static int sdc_block_write(uint8_t token, uint8_t *buffer, uint16_t len, uint32_t timeout) {
uint8_t d;
int rv;
rv = sdc_ready(timeout);
if (rv) return rv;
sdc_xchg8(token);
if (buffer && len) {
sdc_xchg(buffer, len);
sdc_xchg16(0xff); /* dummy CRC */
d = sdc_xchg8(0xff); /* Response */
if ((d & 0x1f) != 0x05) return EOS_ERR;
}
return EOS_OK;
}
static int sdc_cmd(uint8_t cmd, uint32_t arg, uint8_t flags, uint32_t timeout) {
int do_cs = !(flags & SDC_CMD_FLAG_NOCS);
int rv;
if (do_cs) sdc_select();
rv = sdc_ready(timeout);
if (rv) {
if (do_cs) sdc_deselect();
return rv;
}
rv = sdc_xchg_cmd(cmd, arg, flags);
if (do_cs) sdc_deselect();
return rv;
}
static int sdc_acmd(uint8_t cmd, uint32_t arg, uint8_t flags, uint32_t timeout) {
int rv;
uint64_t start;
if (flags & SDC_CMD_FLAG_NOCS) return EOS_ERR;
start = eos_time_get_tick();
rv = sdc_cmd(APP_CMD, 0, flags & SDC_CMD_FLAG_CRC, timeout);
if (rv & ~SDC_R1_IDLE_STATE) return rv;
return sdc_cmd(cmd, arg, flags, sdc_nto(start, timeout));
}
static int sdc_init(uint32_t timeout, uint8_t *type, uint8_t *lba) {
uint8_t _type, _lba;
int rv, i;
uint8_t ocr[4];
uint64_t start;
_type = 0;
_lba = 0;
start = eos_time_get_tick();
sdc_select();
for (i=10; i--;) sdc_xchg8(0xff); /* 80 dummy cycles */
rv = sdc_cmd(GO_IDLE_STATE, 0, SDC_CMD_FLAG_CRC | SDC_CMD_FLAG_NOCS, timeout);
if (rv != SDC_R1_IDLE_STATE) return SDC_ERR(rv);
sdc_deselect();
sdc_select();
rv = sdc_cmd(SEND_IF_COND, 0x1aa, SDC_CMD_FLAG_CRC | SDC_CMD_FLAG_NOCS, sdc_nto(start, timeout));
switch (rv) {
case SDC_R1_IDLE_STATE:
for (i=0; i<4; i++) {
ocr[i] = sdc_xchg8(0xff); /* get R7 resp */
}
sdc_deselect();
if (ocr[2] == 0x01 && ocr[3] == 0xaa) { /* Check voltage range: 2.7-3.6V */
do {
rv = sdc_acmd(SD_APP_OP_COND, 0x40000000, 0, sdc_nto(start, timeout));
} while (rv == SDC_R1_IDLE_STATE);
if (rv != SDC_R1_READY) return SDC_ERR(rv);
sdc_select();
rv = sdc_cmd(READ_OCR, 0, SDC_CMD_FLAG_NOCS, sdc_nto(start, timeout));
if (rv == SDC_R1_READY) {
for (i=0; i<4; i++) {
ocr[i] = sdc_xchg8(0xff);
}
sdc_deselect();
} else {
sdc_deselect();
return SDC_ERR(rv);
}
_type = SDC_TYPE_SDC2;
if (ocr[0] & 0xc0) _lba = 1;
}
break;
case SDC_R1_IDLE_STATE | SDC_R1_ILLEGAL_CMD:
sdc_deselect();
rv = sdc_acmd(SD_APP_OP_COND, 0, 0, sdc_nto(start, timeout));
switch (rv) {
case SDC_R1_IDLE_STATE:
do {
rv = sdc_acmd(SD_APP_OP_COND, 0, 0, sdc_nto(start, timeout));
} while (rv == SDC_R1_IDLE_STATE);
if (rv != SDC_R1_READY) return SDC_ERR(rv);
case SDC_R1_READY:
_type = SDC_TYPE_SDC1;
break;
default:
do {
rv = sdc_cmd(SEND_OP_COND, 0, 0, sdc_nto(start, timeout));
} while (rv == SDC_R1_IDLE_STATE);
if (rv != SDC_R1_READY) return SDC_ERR(rv);
_type = SDC_TYPE_MMC;
break;
}
break;
default:
sdc_deselect();
return SDC_ERR(rv);
}
if (_type && !_lba) {
rv = sdc_cmd(SET_BLOCKLEN, 512, 0, sdc_nto(start, timeout));
if (rv != SDC_R1_READY) return SDC_ERR(rv);
}
*type = _type;
*lba = _lba;
return EOS_OK;
}
#include <stdio.h>
void eos_sdc_init(void) {
uint8_t type, lba;
int rv;
eos_spi_select(EOS_SPI_DEV_SDC);
rv = sdc_init(5000, &type, &lba);
if (rv) {
printf("SDC ERROR\n");
} else {
printf("SDC OK:%d %d\n", type, lba);
}
eos_spi_deselect();
}
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