LIV2/amiga-par-to-spi-adapter
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Add FIFOs to enhance SD card performance

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This commit is contained in:
Niklas Ekström 2025-03-14 14:26:56 +01:00
parent 8ec5d2880f
commit 5f219f1a35
1 changed files with 47 additions and 13 deletions
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60
spi-lib-sf2000/spi.c
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@ -41,13 +41,13 @@ static struct SF2000SDRegisters *regs;
#define MODE_TX 2
#define MODE_BOTH 3
#define STATUS_IN_FULL 0x0040
#define STATUS_IN1_FULL 0x0020
#define STATUS_IN0_FULL 0x0010
#define STATUS_OUT1_FULL 0x0008
#define STATUS_OUT0_FULL 0x0004
#define STATUS_OUT_FULL 0x0002
#define STATUS_BUSY 0x0001
#define STATUS_SHIFTER_BUSY 0x0040
#define STATUS_TX_HALF_EMPTY 0x0020
#define STATUS_RX_HALF_FULL 0x0010
#define STATUS_TX_CB_FULL 0x0008
#define STATUS_TX_CB_EMPTY 0x0004
#define STATUS_RX_CB_FULL 0x0002
#define STATUS_RX_CB_EMPTY 0x0001
#define IRQ_CD_CHANGED 1
@ -99,7 +99,7 @@ void spi_read(__reg("a0") UBYTE *buf, __reg("d0") WORD size)
if (((ULONG)buf) & 1)
{
while ((regs->status & STATUS_OUT1_FULL) == 0) {
while ((regs->status & STATUS_RX_CB_EMPTY) != 0) {
}
*buf++ = *byte_access;
size -= 1;
@ -107,9 +107,26 @@ void spi_read(__reg("a0") UBYTE *buf, __reg("d0") WORD size)
UWORD *buf_word = (UWORD *)buf;
WORD chunk_count = size >> 4;
size -= chunk_count << 4;
for (WORD i = chunk_count - 1; i >= 0; i--)
{
while ((regs->status & STATUS_RX_HALF_FULL) == 0) {
}
*buf_word++ = *word_access;
*buf_word++ = *word_access;
*buf_word++ = *word_access;
*buf_word++ = *word_access;
*buf_word++ = *word_access;
*buf_word++ = *word_access;
*buf_word++ = *word_access;
*buf_word++ = *word_access;
}
for (WORD i = (size >> 1) - 1; i >= 0; i--)
{
while ((regs->status & (STATUS_OUT1_FULL | STATUS_OUT0_FULL)) != (STATUS_OUT1_FULL | STATUS_OUT0_FULL)) {
while ((regs->status & STATUS_RX_CB_FULL) == 0) {
}
*buf_word++ = *word_access;
}
@ -117,7 +134,7 @@ void spi_read(__reg("a0") UBYTE *buf, __reg("d0") WORD size)
if (size & 1)
{
buf = (UBYTE *)buf_word;
while ((regs->status & STATUS_OUT1_FULL) == 0) {
while ((regs->status & STATUS_RX_CB_EMPTY) != 0) {
}
*buf++ = *byte_access;
}
@ -138,9 +155,26 @@ void spi_write(__reg("a0") const UBYTE *buf, __reg("d0") WORD size)
const UWORD *buf_word = (const UWORD *)buf;
WORD chunk_count = size >> 4;
size -= chunk_count << 4;
for (WORD i = chunk_count - 1; i >= 0; i--)
{
while ((regs->status & STATUS_TX_HALF_EMPTY) == 0) {
}
*word_access = *buf_word++;
*word_access = *buf_word++;
*word_access = *buf_word++;
*word_access = *buf_word++;
*word_access = *buf_word++;
*word_access = *buf_word++;
*word_access = *buf_word++;
*word_access = *buf_word++;
}
for (WORD i = (size >> 1) - 1; i >= 0; i--)
{
while ((regs->status & (STATUS_IN1_FULL | STATUS_IN0_FULL)) != 0) {
while ((regs->status & STATUS_TX_CB_EMPTY) == 0) {
}
*word_access = *buf_word++;
}
@ -148,12 +182,12 @@ void spi_write(__reg("a0") const UBYTE *buf, __reg("d0") WORD size)
if (size & 1)
{
buf = (const UBYTE *)buf_word;
while ((regs->status & STATUS_IN0_FULL) != 0) {
while ((regs->status & STATUS_TX_CB_FULL) != 0) {
}
*byte_access = *buf++;
}
while (regs->status & (STATUS_IN_FULL | STATUS_IN1_FULL | STATUS_IN0_FULL | STATUS_BUSY)) {
while (regs->status & STATUS_SHIFTER_BUSY) {
}
}