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software/liblitesdcard: base it on FatFs generic example code + LiteX's SPIMaster specific functions.

This commit is contained in:
Florent Kermarrec 2020-06-05 16:27:38 +02:00
parent 5b908983a2
commit f972c8e45e
1 changed files with 456 additions and 168 deletions
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620
litex/soc/software/liblitesdcard/spisdcard.c
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@ -1,8 +1,20 @@
// This file is Copyright (c) 2020 Rob Shelton <rob.s.ng15@googlemail.com>
// This file is Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr> // This file is Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
// This file is Copyright (c) 2020 Rob Shelton <rob.s.ng15@googlemail.com>
// License: BSD // License: BSD
// // FatFs's generic example adapted for LiteX's SPIMaster.
// SDCard SPI-Mode support for LiteX's SPIMaster.
/*------------------------------------------------------------------------/
/ Foolproof MMCv3/SDv1/SDv2 (in SPI mode) control module
/-------------------------------------------------------------------------/
/
/ Copyright (C) 2019, 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.
/
/-------------------------------------------------------------------------*/
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
@ -12,6 +24,8 @@
#include <generated/mem.h> #include <generated/mem.h>
#include <system.h> #include <system.h>
#include "ff.h"
#include "diskio.h"
#include "spisdcard.h" #include "spisdcard.h"
#ifdef CSR_SPISDCARD_BASE #ifdef CSR_SPISDCARD_BASE
@ -53,193 +67,467 @@ static uint8_t spi_xfer(uint8_t byte) {
return spisdcard_miso_read(); return spisdcard_miso_read();
} }
/* SPI SDCard functions */ /*--------------------------------------------------------------------------
Module Private Functions
---------------------------------------------------------------------------*/
/* MMC/SD command (SPI mode) */
#define CMD0 (0) /* GO_IDLE_STATE */
#define CMD1 (1) /* SEND_OP_COND */
#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 CMD13 (13) /* SEND_STATUS */
#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 */
#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
DSTATUS Stat = STA_NOINIT; /* Disk status */
static
BYTE CardType; /* b0:MMC, b1:SDv1, b2:SDv2, b3:Block addressing */
/*-----------------------------------------------------------------------*/
/* Transmit bytes to the card */
/*-----------------------------------------------------------------------*/
static
void xmit_mmc (
const BYTE* buff, /* Data to be sent */
UINT bc /* Number of bytes to send */
)
{
BYTE d;
static uint8_t spisdcard_wait_response(void) {
uint8_t timeout;
uint8_t response;
timeout = 32;
/* Do SPI Xfers on SDCard until MISO MSB's is 0 (valid response) or timeout is expired */
do { do {
response = spi_xfer(0xff); d = *buff++; /* Get a byte to be sent */
timeout--; spi_xfer(d);
} while(((response & 0x80) !=0) && timeout > 0); } while (--bc);
return response;
} }
static uint8_t spisdcard_set_mode(void) {
uint8_t timeout;
uint8_t response;
timeout = 32;
/*-----------------------------------------------------------------------*/
/* Receive bytes from the card */
/*-----------------------------------------------------------------------*/
static
void rcvr_mmc (
BYTE *buff, /* Pointer to read buffer */
UINT bc /* Number of bytes to receive */
)
{
BYTE r;
do { do {
int i; r = spi_xfer(0xff);
/* Set CS and send 80 clock pulses to set the SDCard in SPI Mode */ *buff++ = r; /* Store a received byte */
spisdcard_cs_write(SPI_CS_HIGH); } while (--bc);
for (i=0; i<10; i++) }
spi_xfer(0xff);
/* Clear CS and read response, if 0 the SDCard has been initialized to SPI Mode */
spisdcard_cs_write(SPI_CS_LOW);
response = spisdcard_wait_response();
timeout--;
} while ((timeout > 0) && (response == 0));
if(timeout == 0)
/*-----------------------------------------------------------------------*/
/* Wait for card ready */
/*-----------------------------------------------------------------------*/
static
int wait_ready (void) /* 1:OK, 0:Timeout */
{
BYTE d;
UINT tmr;
for (tmr = 5000; tmr; tmr--) { /* Wait for ready in timeout of 500ms */
rcvr_mmc(&d, 1);
if (d == 0xFF) break;
}
return tmr ? 1 : 0;
}
/*-----------------------------------------------------------------------*/
/* Deselect the card and release SPI bus */
/*-----------------------------------------------------------------------*/
static
void deselect (void)
{
BYTE d;
spisdcard_cs_write(SPI_CS_HIGH); /* Set CS# high */
rcvr_mmc(&d, 1); /* Dummy clock (force DO hi-z for multiple slave SPI) */
}
/*-----------------------------------------------------------------------*/
/* Select the card and wait for ready */
/*-----------------------------------------------------------------------*/
static
int select (void) /* 1:OK, 0:Timeout */
{
BYTE d;
spisdcard_cs_write(SPI_CS_LOW); /* Set CS# high */
rcvr_mmc(&d, 1); /* Dummy clock (force DO enabled) */
if (wait_ready()) return 1; /* Wait for card ready */
deselect();
return 0; /* Failed */
}
/*-----------------------------------------------------------------------*/
/* Receive a data packet from the card */
/*-----------------------------------------------------------------------*/
static
int rcvr_datablock ( /* 1:OK, 0:Failed */
BYTE *buff, /* Data buffer to store received data */
UINT btr /* Byte count */
)
{
BYTE d[2];
UINT tmr;
for (tmr = 1000; tmr; tmr--) { /* Wait for data packet in timeout of 100ms */
rcvr_mmc(d, 1);
if (d[0] != 0xFF) break;
}
if (d[0] != 0xFE) return 0; /* If not valid data token, return with error */
rcvr_mmc(buff, btr); /* Receive the data block into buffer */
rcvr_mmc(d, 2); /* Discard CRC */
return 1; /* Return with success */
}
/*-----------------------------------------------------------------------*/
/* Send a data packet to the card */
/*-----------------------------------------------------------------------*/
static
int xmit_datablock ( /* 1:OK, 0:Failed */
const BYTE *buff, /* 512 byte data block to be transmitted */
BYTE token /* Data/Stop token */
)
{
BYTE d[2];
if (!wait_ready()) return 0;
d[0] = token;
xmit_mmc(d, 1); /* Xmit a token */
if (token != 0xFD) { /* Is it data token? */
xmit_mmc(buff, 512); /* Xmit the 512 byte data block to MMC */
rcvr_mmc(d, 2); /* Xmit dummy CRC (0xFF,0xFF) */
rcvr_mmc(d, 1); /* Receive data response */
if ((d[0] & 0x1F) != 0x05) /* If not accepted, return with error */
return 0; return 0;
}
return 1; return 1;
} }
uint8_t spisdcard_init(void) {
uint8_t i;
uint8_t r;
uint8_t timeout;
/*-----------------------------------------------------------------------*/
/* Send a command packet to the card */
/*-----------------------------------------------------------------------*/
static
BYTE send_cmd ( /* Returns command response (bit7==1:Send failed)*/
BYTE cmd, /* Command byte */
DWORD arg /* Argument */
)
{
BYTE n, d, buf[6];
if (cmd & 0x80) { /* ACMD<n> is the command sequense of CMD55-CMD<n> */
cmd &= 0x7F;
n = send_cmd(CMD55, 0);
if (n > 1) return n;
}
/* Select the card and wait for ready except to stop multiple block read */
if (cmd != CMD12) {
deselect();
if (!select()) return 0xFF;
}
/* Send a command packet */
buf[0] = 0x40 | cmd; /* Start + Command index */
buf[1] = (BYTE)(arg >> 24); /* Argument[31..24] */
buf[2] = (BYTE)(arg >> 16); /* Argument[23..16] */
buf[3] = (BYTE)(arg >> 8); /* Argument[15..8] */
buf[4] = (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)) */
buf[5] = n;
xmit_mmc(buf, 6);
/* Receive command response */
if (cmd == CMD12) rcvr_mmc(&d, 1); /* Skip a stuff byte when stop reading */
n = 10; /* Wait for a valid response in timeout of 10 attempts */
do
rcvr_mmc(&d, 1);
while ((d & 0x80) && --n);
return d; /* Return with the response value */
}
/*--------------------------------------------------------------------------
Public Functions
---------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------*/
/* Get Disk Status */
/*-----------------------------------------------------------------------*/
DSTATUS disk_status (
BYTE drv /* Drive number (always 0) */
)
{
if (drv) return STA_NOINIT;
return Stat;
}
/*-----------------------------------------------------------------------*/
/* Initialize Disk Drive */
/*-----------------------------------------------------------------------*/
DSTATUS disk_initialize (
BYTE drv /* Physical drive nmuber (0) */
)
{
BYTE n, ty, cmd, buf[4];
UINT tmr;
DSTATUS s;
if (drv) return RES_NOTRDY;
busy_wait(10); /* 10ms */
for (n = 10; n; n--) rcvr_mmc(buf, 1); /* Apply 80 dummy clocks and the card gets ready to receive command */
ty = 0;
if (send_cmd(CMD0, 0) == 1) { /* Enter Idle state */
if (send_cmd(CMD8, 0x1AA) == 1) { /* SDv2? */
rcvr_mmc(buf, 4); /* Get trailing return value of R7 resp */
if (buf[2] == 0x01 && buf[3] == 0xAA) { /* The card can work at vdd range of 2.7-3.6V */
for (tmr = 1000; tmr; tmr--) { /* Wait for leaving idle state (ACMD41 with HCS bit) */
if (send_cmd(ACMD41, 1UL << 30) == 0) break;
busy_wait(1);
}
if (tmr && send_cmd(CMD58, 0) == 0) { /* Check CCS bit in the OCR */
rcvr_mmc(buf, 4);
ty = (buf[0] & 0x40) ? CT_SD2 | CT_BLOCK : CT_SD2; /* SDv2 */
}
}
} else { /* SDv1 or MMCv3 */
if (send_cmd(ACMD41, 0) <= 1) {
ty = CT_SD1; cmd = ACMD41; /* SDv1 */
} else {
ty = CT_MMC; cmd = CMD1; /* MMCv3 */
}
for (tmr = 1000; tmr; tmr--) { /* Wait for leaving idle state */
if (send_cmd(cmd, 0) == 0) break;
busy_wait(1);
}
if (!tmr || send_cmd(CMD16, 512) != 0) /* Set R/W block length to 512 */
ty = 0;
}
}
CardType = ty;
s = ty ? 0 : STA_NOINIT;
Stat = s;
deselect();
return s;
}
/*-----------------------------------------------------------------------*/
/* Read Sector(s) */
/*-----------------------------------------------------------------------*/
DRESULT disk_read (
BYTE drv, /* Physical drive nmuber (0) */
BYTE *buff, /* Pointer to the data buffer to store read data */
LBA_t sector, /* Start sector number (LBA) */
UINT count /* Sector count (1..128) */
)
{
BYTE cmd;
DWORD sect = (DWORD)sector;
//FIXME if (disk_status(drv) & STA_NOINIT) return RES_NOTRDY;
if (!(CardType & CT_BLOCK)) sect *= 512; /* Convert LBA to byte address if needed */
cmd = count > 1 ? CMD18 : CMD17; /* READ_MULTIPLE_BLOCK : READ_SINGLE_BLOCK */
if (send_cmd(cmd, sect) == 0) {
do {
if (!rcvr_datablock(buff, 512)) break;
buff += 512;
} while (--count);
if (cmd == CMD18) send_cmd(CMD12, 0); /* STOP_TRANSMISSION */
}
deselect();
return count ? RES_ERROR : RES_OK;
}
/*-----------------------------------------------------------------------*/
/* Write Sector(s) */
/*-----------------------------------------------------------------------*/
DRESULT disk_write (
BYTE drv, /* Physical drive nmuber (0) */
const BYTE *buff, /* Pointer to the data to be written */
LBA_t sector, /* Start sector number (LBA) */
UINT count /* Sector count (1..128) */
)
{
DWORD sect = (DWORD)sector;
//FIXME if (disk_status(drv) & STA_NOINIT) return RES_NOTRDY;
if (!(CardType & CT_BLOCK)) sect *= 512; /* Convert LBA to byte address if needed */
if (count == 1) { /* Single block write */
if ((send_cmd(CMD24, sect) == 0) /* WRITE_BLOCK */
&& xmit_datablock(buff, 0xFE))
count = 0;
}
else { /* Multiple block write */
if (CardType & CT_SDC) send_cmd(ACMD23, count);
if (send_cmd(CMD25, sect) == 0) { /* WRITE_MULTIPLE_BLOCK */
do {
if (!xmit_datablock(buff, 0xFC)) break;
buff += 512;
} while (--count);
if (!xmit_datablock(0, 0xFD)) /* STOP_TRAN token */
count = 1;
}
}
deselect();
return count ? RES_ERROR : RES_OK;
}
/*-----------------------------------------------------------------------*/
/* Miscellaneous Functions */
/*-----------------------------------------------------------------------*/
DRESULT disk_ioctl (
BYTE drv, /* Physical drive nmuber (0) */
BYTE ctrl, /* Control code */
void *buff /* Buffer to send/receive control data */
)
{
DRESULT res;
BYTE n, csd[16];
DWORD cs;
//FIXME if (disk_status(drv) & STA_NOINIT) return RES_NOTRDY; /* Check if card is in the socket */
res = RES_ERROR;
switch (ctrl) {
case CTRL_SYNC : /* Make sure that no pending write process */
if (select()) res = RES_OK;
break;
case GET_SECTOR_COUNT : /* Get number of sectors on the disk (DWORD) */
if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16)) {
if ((csd[0] >> 6) == 1) { /* SDC ver 2.00 */
cs = csd[9] + ((WORD)csd[8] << 8) + ((DWORD)(csd[7] & 63) << 16) + 1;
*(LBA_t*)buff = cs << 10;
} else { /* SDC ver 1.XX or MMC */
n = (csd[5] & 15) + ((csd[10] & 128) >> 7) + ((csd[9] & 3) << 1) + 2;
cs = (csd[8] >> 6) + ((WORD)csd[7] << 2) + ((WORD)(csd[6] & 3) << 10) + 1;
*(LBA_t*)buff = cs << (n - 9);
}
res = RES_OK;
}
break;
case GET_BLOCK_SIZE : /* Get erase block size in unit of sector (DWORD) */
*(DWORD*)buff = 128;
res = RES_OK;
break;
default:
res = RES_PARERR;
}
deselect();
return res;
}
/*-----------------------------------------------------------------------*/
/* LiteX's BIOS */
/*-----------------------------------------------------------------------*/
uint8_t spisdcard_init(void) {
uint8_t r;
/* Set SPI clk freq to 400KHz */ /* Set SPI clk freq to 400KHz */
spi_set_clk_freq(400000); spi_set_clk_freq(400000);
/* Set SDCard in SPI Mode */ /* Initialize the SDCard */
r = spisdcard_set_mode(); r = disk_initialize(0);
if(r != 0x01)
return 0;
/* Send SD CARD IDLE */ /* Increase SPI clk freq to 16MHz if successful */
/* CMD0 */ if (r == RES_OK) {
spi_xfer(0xff);
spi_xfer(0x40);
spi_xfer(0x00);
spi_xfer(0x00);
spi_xfer(0x00);
spi_xfer(0x00);
spi_xfer(0x95);
/* R1 response, expects 0x1 */
r = spisdcard_wait_response();
if(r != 0x01)
return 0;
/* Send Check SD CARD type */
/* CMD8 */
spi_xfer(0xff);
spi_xfer(0x48);
spi_xfer(0x00);
spi_xfer(0x00);
spi_xfer(0x01);
spi_xfer(0xaa);
spi_xfer(0x87);
/* R7, expects 0x1 */
r = spisdcard_wait_response();
if(r != 0x01)
return 0;
/* Reveice the 4 trailing bytes */
for(i=0; i<4; i++)
r = spi_xfer(0xff); /* FIXME: add check? */
/* Send Force SD CARD READY (CMD55 + ACMD41), expects 0x00 R1 response */
timeout = 32;
do {
/* CMD55 */
spi_xfer(0xff);
spi_xfer(0x77);
spi_xfer(0x00);
spi_xfer(0x00);
spi_xfer(0x00);
spi_xfer(0x00);
spi_xfer(0x00);
r = spisdcard_wait_response();
/* ACMD41 */
spi_xfer(0xff);
spi_xfer(0x69);
spi_xfer(0x40);
spi_xfer(0x00);
spi_xfer(0x00);
spi_xfer(0x00);
spi_xfer(0x00);
/* R1 */
r = spisdcard_wait_response();
timeout--;
/* 20ms delay */
busy_wait(20);
} while ((r != 0x00) && (timeout > 0));
if(r != 0x00)
return 0;
/* Send Read SD CARD OCR (status register) */
/* CMD58 */
spi_xfer(0xff);
spi_xfer(0x7a);
spi_xfer(0x00);
spi_xfer(0x00);
spi_xfer(0x00);
spi_xfer(0x00);
spi_xfer(0xff);
/* R3, expects 0x1 */
r = spisdcard_wait_response();
if(r > 0x01)
return 0;
/* Reveice the 4 trailing bytes */
for(i=0; i<4; i++)
r = spi_xfer(0xff); /* FIXME: add check? */
/* Send Set SD CARD block size */
/* CMD16 */
spi_xfer(0xff);
spi_xfer(0x50);
spi_xfer(0x00);
spi_xfer(0x00);
spi_xfer(0x02);
spi_xfer(0x00);
spi_xfer(0xff);
/* RI, expects 0x00 */
r = spisdcard_wait_response();
if(r != 0x00)
return 0;
/* Set SPI clk freq to 16MHz */
spi_set_clk_freq(16000000); spi_set_clk_freq(16000000);
}
return 1; return (r == RES_OK);
} }
uint8_t spisdcard_read_block(uint32_t addr, uint8_t *buf) { uint8_t spisdcard_read_block(uint32_t addr, uint8_t *buf) {
int i; return (disk_read(0, buf, addr, 1) == RES_OK);
uint32_t timeout;
uint8_t r;
/* Send Read Block */
/* CMD17 */
spi_xfer(0xff);
spi_xfer(0x51);
spi_xfer((addr >> 24) & 0xff);
spi_xfer((addr >> 16) & 0xff);
spi_xfer((addr >> 8) & 0xff);
spi_xfer((addr >> 0) & 0xff);
spi_xfer(0xff);
/* R1, expects 0x00 that indicates the SDCard is processing */
r = spisdcard_wait_response();
if(r != 0x00)
return 0;
/* Do SPI Xfers on SDCard until 0xfe is received (block start) or timeout is expired */
r = spi_xfer(0xff);
timeout = 16384;
do {
r = spi_xfer(0xff);
timeout--;
} while((r != 0xfe) && (timeout>0));
if(r != 0xfe)
return 0;
/* Read the block from the SDCard and copy it to the buffer */
for(i=0; i<512; i++)
buf[i] = spi_xfer(0xff);
/* Read the 8 dummy bytes */
for(i=0; i<8; i++)
r = spi_xfer(0xff);
return 1;
} }
#endif #endif