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software/libsdcard: rewrite/simplify SPISDCard/FatFs support and only keep SDCard ver2.00+ compatibility.

This commit is contained in:
Florent Kermarrec 2020-06-09 12:50:56 +02:00
parent 20ff24622a
commit fb282d1a72
2 changed files with 216 additions and 307 deletions
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485
litex/soc/software/liblitesdcard/spisdcard.c
View File

@ -1,20 +1,8 @@
// 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
// FatFs's generic example adapted 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.
/
/-------------------------------------------------------------------------*/
// SPI SDCard support for LiteX's SPIMaster (limited to ver2.00+ SDCards).
#include <stdio.h>
#include <stdlib.h>
@ -30,15 +18,14 @@
#ifdef CSR_SPISDCARD_BASE
/* SPI Master flags */
#define SPI_CS_HIGH (0 << 0)
#define SPI_CS_LOW (1 << 0)
#define SPI_START (1 << 0)
#define SPI_DONE (1 << 0)
#define SPI_LENGTH (1 << 8)
#define SDCARD_DEBUG
/*-----------------------------------------------------------------------*/
/* SPI Master low-level functions */
/*-----------------------------------------------------------------------*/
#define SPI_CLK_FREQ_INIT 400000
#define SPI_CLK_FREQ_OPERATIONAL 10000000
static void spi_set_clk_freq(uint32_t clk_freq) {
uint32_t divider;
@ -47,11 +34,13 @@ static void spi_set_clk_freq(uint32_t clk_freq) {
divider = 65535;
if (divider <= 2) /* At least half CPU speed */
divider = 2;
#ifdef SDCARD_DEBUG
printf("Setting SDCard clk freq to ");
if (clk_freq > 1000000)
printf("%d MHz\n", (CONFIG_CLOCK_FREQUENCY/divider)/1000000);
else
printf("%d KHz\n", (CONFIG_CLOCK_FREQUENCY/divider)/1000);
#endif
spisdcard_clk_divider_write(divider);
}
@ -66,346 +55,228 @@ static uint8_t spi_xfer(uint8_t byte) {
return spisdcard_miso_read();
}
/*--------------------------------------------------------------------------
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 */
/* SDCard Select/Deselect functions */
/*-----------------------------------------------------------------------*/
static
void xmit_mmc (
const BYTE* buff, /* Data to be sent */
UINT bc /* Number of bytes to send */
)
{
BYTE d;
do {
d = *buff++; /* Get a byte to be sent */
spi_xfer(d);
} while (--bc);
static void spisdcarddeselect(void) {
/* Set SPI CS High */
spisdcard_cs_write(SPI_CS_HIGH);
/* Generate 8 dummy clocks */
spi_xfer(0xff);
}
static int spisdcardselect(void) {
uint16_t timeout;
/* Set SPI CS Low */
spisdcard_cs_write(SPI_CS_LOW);
/*-----------------------------------------------------------------------*/
/* Receive bytes from the card */
/*-----------------------------------------------------------------------*/
/* Generate 8 dummy clocks */
spi_xfer(0xff);
static
void rcvr_mmc (
BYTE *buff, /* Pointer to read buffer */
UINT bc /* Number of bytes to receive */
)
{
BYTE r;
do {
r = spi_xfer(0xff);
*buff++ = r; /* Store a received byte */
} while (--bc);
}
/*-----------------------------------------------------------------------*/
/* 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;
/* Wait 500ms for the card to be ready */
timeout = 500;
while(timeout > 0) {
if (spi_xfer(0xff) == 0xff)
return 1;
busy_wait(1);
timeout--;
}
return tmr ? 1 : 0;
/* Deselect card on error */
spisdcarddeselect();
return 0;
}
/*-----------------------------------------------------------------------*/
/* Deselect the card and release SPI bus */
/* SDCard bytes Xfer functions */
/*-----------------------------------------------------------------------*/
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) */
static void spisdcardwrite_bytes(uint8_t* buf, uint16_t n) {
uint16_t i;
for (i=0; i<n; i++)
spi_xfer(buf[i]);
}
/*-----------------------------------------------------------------------*/
/* 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 */
static void spisdcardread_bytes(uint8_t* buf, uint16_t n) {
uint16_t i;
for (i=0; i<n; i++)
buf[i] = spi_xfer(0xff);
}
/*-----------------------------------------------------------------------*/
/* Receive a data packet from the card */
/* SDCard block Xfer functions */
/*-----------------------------------------------------------------------*/
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;
static uint8_t spisdcardreceive_block(uint8_t *buf) {
uint16_t timeout;
for (tmr = 1000; tmr; tmr--) { /* Wait for data packet in timeout of 100ms */
rcvr_mmc(d, 1);
if (d[0] != 0xFF) break;
/* Wait 100ms for a start of block */
timeout = 100;
while(timeout > 0) {
if (spi_xfer(0xff) == 0xfe)
break;
busy_wait(1);
timeout--;
}
if (d[0] != 0xFE) return 0; /* If not valid data token, return with error */
if (timeout == 0)
return 0;
rcvr_mmc(buff, btr); /* Receive the data block into buffer */
rcvr_mmc(d, 2); /* Discard CRC */
/* Receive block */
spisdcardread_bytes(buf, 512);
return 1; /* Return with success */
/* Discard CRC */
spi_xfer(0xff);
spi_xfer(0xff);
return 1;
}
/*-----------------------------------------------------------------------*/
/* Send a command packet to the card */
/* SDCard Command functions */
/*-----------------------------------------------------------------------*/
static
BYTE send_cmd ( /* Returns command response (bit7==1:Send failed)*/
BYTE cmd, /* Command byte */
DWORD arg /* Argument */
)
static uint8_t spisdcardsend_cmd(uint8_t cmd, uint32_t arg)
{
BYTE n, d, buf[6];
uint8_t byte;
uint8_t buf[6];
uint8_t timeout;
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;
/* Send CMD55 for ACMD */
if (cmd & 0x80) {
cmd &= 0x7f;
byte = spisdcardsend_cmd(CMD55, 0);
if (byte > 1)
return byte;
}
/* Select the card and wait for ready except to stop multiple block read */
/* Select the card and wait for it, except for CMD12: STOP_TRANSMISSION */
if (cmd != CMD12) {
deselect();
if (!select()) return 0xFF;
spisdcarddeselect();
if (spisdcardselect() == 0)
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);
/* Send Command */
buf[0] = 0x40 | cmd; /* Start + Command */
buf[1] = (uint8_t)(arg >> 24); /* Argument[31:24] */
buf[2] = (uint8_t)(arg >> 16); /* Argument[23:16] */
buf[3] = (uint8_t)(arg >> 8); /* Argument[15:8] */
buf[4] = (uint8_t)(arg >> 0); /* Argument[7:0] */
if (cmd == CMD0)
buf[5] = 0x95; /* Valid CRC for CMD0 */
else if (cmd == CMD8)
buf[5] = 0x87; /* Valid CRC for CMD8 (0x1AA) */
else
buf[5] = 0x01; /* Dummy CRC + Stop */
spisdcardwrite_bytes(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);
/* Receive Command response */
if (cmd == CMD12)
spisdcardread_bytes(&byte, 1); /* Read stuff byte */
timeout = 10; /* Wait for a valid response (up to 10 attempts) */
while (timeout > 0) {
spisdcardread_bytes(&byte, 1);
if ((byte & 0x80) == 0)
break;
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);
timeout--;
}
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;
return byte;
}
/*-----------------------------------------------------------------------*/
/* LiteX's BIOS */
/* SDCard Initialization functions */
/*-----------------------------------------------------------------------*/
uint8_t spisdcard_init(void) {
uint8_t r;
/* Set SPI clk freq to 400KHz */
spi_set_clk_freq(400000);
uint8_t i;
uint8_t buf[4];
uint16_t timeout;
/* Initialize the SDCard */
r = disk_initialize(0);
/* Set SPI clk freq to initialization frequency */
spi_set_clk_freq(SPI_CLK_FREQ_INIT);
/* Increase SPI clk freq to 16MHz if successful */
if (r == RES_OK) {
spi_set_clk_freq(16000000);
/* Wait 10ms */
busy_wait(10);
/* Set SDCard in SPI Mode (generate 80 dummy clocks) */
for (i=0; i<10; i++)
spi_xfer(0xff);
/* Set SDCard in Idle state */
if (spisdcardsend_cmd(CMD0, 0) != 0x1)
return 0;
/* Set SDCard voltages, only supported by ver2.00+ SDCards */
if (spisdcardsend_cmd(CMD8, 0x1AA) != 0x1)
return 0;
spisdcardread_bytes(buf, 4); /* Get additional bytes of R7 response */
/* Set SDCard in Operational state (1s timeout) */
timeout = 1000;
while (timeout > 0) {
if (spisdcardsend_cmd(ACMD41, 1 << 30) == 0)
break;
busy_wait(1);
timeout--;
}
if (timeout == 0)
return 0;
return (r == RES_OK);
/* Set SPI clk freq to operational frequency */
spi_set_clk_freq(SPI_CLK_FREQ_OPERATIONAL);
return 1;
}
uint8_t spisdcard_read_block(uint32_t addr, uint8_t *buf) {
return (disk_read(0, buf, addr, 1) == RES_OK);
/*-----------------------------------------------------------------------*/
/* SDCard FatFs disk functions */
/*-----------------------------------------------------------------------*/
static DSTATUS spisdcardstatus = STA_NOINIT;
DSTATUS disk_status(uint8_t drv) {
if (drv) return STA_NOINIT;
return spisdcardstatus;
}
DSTATUS disk_initialize(uint8_t drv) {
uint8_t r;
if (drv) return RES_NOTRDY;
r = spisdcard_init();
spisdcarddeselect();
spisdcardstatus = r ? 0 : STA_NOINIT;
return spisdcardstatus;
}
DRESULT disk_read(uint8_t drv, uint8_t *buf, uint32_t sector, uint32_t count) {
uint8_t cmd;
if (count > 1)
cmd = CMD18; /* READ_MULTIPLE_BLOCK */
else
cmd = CMD17; /* READ_SINGLE_BLOCK */
if (spisdcardsend_cmd(cmd, sector) == 0) {
while(count > 0) {
if (spisdcardreceive_block(buf) == 0)
break;
buf += 512;
count--;
}
if (cmd == CMD18)
spisdcardsend_cmd(CMD12, 0); /* STOP_TRANSMISSION */
}
spisdcarddeselect();
if (count)
return RES_ERROR;
return RES_OK;
}
#endif

38
litex/soc/software/liblitesdcard/spisdcard.h
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@ -9,6 +9,44 @@
#ifdef CSR_SPISDCARD_BASE
/*-----------------------------------------------------------------------*/
/* SPI Master Flags */
/*-----------------------------------------------------------------------*/
#define SPI_CS_HIGH (0 << 0)
#define SPI_CS_LOW (1 << 0)
#define SPI_START (1 << 0)
#define SPI_DONE (1 << 0)
#define SPI_LENGTH (1 << 8)
/*-----------------------------------------------------------------------*/
/* SDCard SPI Commands */
/*-----------------------------------------------------------------------*/
#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 */
uint8_t spisdcard_init(void);
uint8_t spisdcard_read_block(uint32_t addr, uint8_t *buf);