int spi_xfer(struct spi_slave *slave, const void *dout,
unsigned int bytesout, void *din, unsigned int bytesin)
{
/* First byte is cmd which can not being sent through FIFO. */
u8 cmd = *(u8 *)dout++;
u8 readoffby1;
u8 count;
bytesout--;
/*
* Check if this is a write command attempting to transfer more bytes
* than the controller can handle. Iterations for writes are not
* supported here because each SPI write command needs to be preceded
* and followed by other SPI commands, and this sequence is controlled
* by the SPI chip driver.
*/
if (bytesout > AMD_SB_SPI_TX_LEN) {
printk(BIOS_DEBUG, "FCH SPI: Too much to write. Does your SPI chip driver use"
" spi_crop_chunk()?\n");
return -1;
}
readoffby1 = bytesout ? 0 : 1;
#if CONFIG_SOUTHBRIDGE_AMD_AGESA_YANGTZE
spi_write(0x1E, 5);
spi_write(0x1F, bytesout); /* SpiExtRegIndx [5] - TxByteCount */
spi_write(0x1E, 6);
spi_write(0x1F, bytesin); /* SpiExtRegIndx [6] - RxByteCount */
#else
u8 readwrite = (bytesin + readoffby1) << 4 | bytesout;
spi_write(SPI_REG_CNTRL01, readwrite);
#endif
spi_write(SPI_REG_OPCODE, cmd);
reset_internal_fifo_pointer();
for (count = 0; count < bytesout; count++, dout++) {
spi_write(SPI_REG_FIFO, *(uint8_t *)dout);
}
reset_internal_fifo_pointer();
execute_command();
reset_internal_fifo_pointer();
/* Skip the bytes we sent. */
for (count = 0; count < bytesout; count++) {
cmd = spi_read(SPI_REG_FIFO);
}
reset_internal_fifo_pointer();
for (count = 0; count < bytesin; count++, din++) {
*(uint8_t *)din = spi_read(SPI_REG_FIFO);
}
return 0;
}
int spi_xfer(struct spi_slave *slave, const void *dout,
unsigned int bytesout, void *din, unsigned int bytesin)
{
/* First byte is cmd which cannot be sent through the FIFO. */
u8 cmd = *(u8 *)dout++;
u8 readoffby1;
u8 readwrite;
u8 count;
uint32_t spibar = get_spi_bar();
bytesout--;
/*
* Check if this is a write command attempting to transfer more bytes
* than the controller can handle. Iterations for writes are not
* supported here because each SPI write command needs to be preceded
* and followed by other SPI commands, and this sequence is controlled
* by the SPI chip driver.
*/
if (bytesout > AMD_SB_SPI_TX_LEN) {
printk(BIOS_DEBUG, "FCH SPI: Too much to write. Does your SPI chip driver use"
" spi_crop_chunk()?\n");
return -1;
}
readoffby1 = bytesout ? 0 : 1;
readwrite = (bytesin + readoffby1) << 4 | bytesout;
write8((void *)(spibar + 1), readwrite);
write8((void *)(spibar + 0), cmd);
reset_internal_fifo_pointer();
for (count = 0; count < bytesout; count++, dout++) {
write8((void *)(spibar + 0x0C), *(u8 *)dout);
}
reset_internal_fifo_pointer();
execute_command();
reset_internal_fifo_pointer();
/* Skip the bytes we sent. */
for (count = 0; count < bytesout; count++) {
cmd = read8((void *)(spibar + 0x0C));
}
/* read response bytes */
for (count = 0; count < bytesin; count++, din++) {
*(u8 *)din = read8((void *)(spibar + 0x0C));
}
return 0;
}
static int reset_compare_internal_fifo_pointer(uint8_t want)
{
int ret;
ret = compare_internal_fifo_pointer(want);
reset_internal_fifo_pointer();
return ret;
}
int spi_xfer(struct spi_slave *slave, const void *dout,
unsigned int bitsout, void *din, unsigned int bitsin)
{
/* First byte is cmd which can not being sent through FIFO. */
u8 cmd = *(u8 *)dout++;
u8 readoffby1;
u8 readwrite;
u8 bytesout, bytesin;
u8 count;
bitsout -= 8;
bytesout = bitsout / 8;
bytesin = bitsin / 8;
readoffby1 = bytesout ? 0 : 1;
readwrite = (bytesin + readoffby1) << 4 | bytesout;
writeb(readwrite, spibar + 1);
writeb(cmd, spibar + 0);
reset_internal_fifo_pointer();
for (count = 0; count < bytesout; count++, dout++) {
writeb(*(u8 *)dout, spibar + 0x0C);
}
reset_internal_fifo_pointer();
execute_command();
reset_internal_fifo_pointer();
/* Skip the bytes we sent. */
for (count = 0; count < bytesout; count++) {
readb(spibar + 0x0C);
}
//reset_internal_fifo_pointer();
for (count = 0; count < bytesin; count++, din++) {
*(u8 *)din = readb(spibar + 0x0C);
}
return 0;
}
static int sb600_spi_send_command(struct flashctx *flash, unsigned int writecnt,
unsigned int readcnt,
const unsigned char *writearr,
unsigned char *readarr)
{
int count;
/* First byte is cmd which can not being sent through FIFO. */
unsigned char cmd = *writearr++;
unsigned int readoffby1;
unsigned char readwrite;
writecnt--;
msg_pspew("%s, cmd=%x, writecnt=%x, readcnt=%x\n",
__func__, cmd, writecnt, readcnt);
if (readcnt > 8) {
msg_pinfo("%s, SB600 SPI controller can not receive %d bytes, "
"it is limited to 8 bytes\n", __func__, readcnt);
return SPI_INVALID_LENGTH;
}
if (writecnt > 8) {
msg_pinfo("%s, SB600 SPI controller can not send %d bytes, "
"it is limited to 8 bytes\n", __func__, writecnt);
return SPI_INVALID_LENGTH;
}
/* This is a workaround for a bug in SB600 and SB700. If we only send
* an opcode and no additional data/address, the SPI controller will
* read one byte too few from the chip. Basically, the last byte of
* the chip response is discarded and will not end up in the FIFO.
* It is unclear if the CS# line is set high too early as well.
*/
readoffby1 = (writecnt) ? 0 : 1;
readwrite = (readcnt + readoffby1) << 4 | (writecnt);
mmio_writeb(readwrite, sb600_spibar + 1);
mmio_writeb(cmd, sb600_spibar + 0);
/* Before we use the FIFO, reset it first. */
reset_internal_fifo_pointer();
/* Send the write byte to FIFO. */
msg_pspew("Writing: ");
for (count = 0; count < writecnt; count++, writearr++) {
msg_pspew("[%02x]", *writearr);
mmio_writeb(*writearr, sb600_spibar + 0xC);
}
msg_pspew("\n");
/*
* We should send the data by sequence, which means we need to reset
* the FIFO pointer to the first byte we want to send.
*/
if (reset_compare_internal_fifo_pointer(writecnt))
return SPI_PROGRAMMER_ERROR;
msg_pspew("Executing: \n");
execute_command();
/*
* After the command executed, we should find out the index of the
* received byte. Here we just reset the FIFO pointer and skip the
* writecnt.
* It would be possible to increase the FIFO pointer by one instead
* of reading and discarding one byte from the FIFO.
* The FIFO is implemented on top of an 8 byte ring buffer and the
* buffer is never cleared. For every byte that is shifted out after
* the opcode, the FIFO already stores the response from the chip.
* Usually, the chip will respond with 0x00 or 0xff.
*/
if (reset_compare_internal_fifo_pointer(writecnt + readcnt))
return SPI_PROGRAMMER_ERROR;
/* Skip the bytes we sent. */
msg_pspew("Skipping: ");
for (count = 0; count < writecnt; count++) {
cmd = mmio_readb(sb600_spibar + 0xC);
msg_pspew("[%02x]", cmd);
}
msg_pspew("\n");
if (compare_internal_fifo_pointer(writecnt))
return SPI_PROGRAMMER_ERROR;
msg_pspew("Reading: ");
for (count = 0; count < readcnt; count++, readarr++) {
*readarr = mmio_readb(sb600_spibar + 0xC);
msg_pspew("[%02x]", *readarr);
}
msg_pspew("\n");
if (reset_compare_internal_fifo_pointer(readcnt + writecnt))
return SPI_PROGRAMMER_ERROR;
if (mmio_readb(sb600_spibar + 1) != readwrite) {
msg_perr("Unexpected change in SB600 read/write count!\n");
msg_perr("Something else is accessing the flash chip and "
"causes random corruption.\nPlease stop all "
"applications and drivers and IPMI which access the "
"flash chip.\n");
return SPI_PROGRAMMER_ERROR;
}
return 0;
}
static int sb600_spi_send_command(struct flashctx *flash, unsigned int writecnt,
unsigned int readcnt,
const unsigned char *writearr,
unsigned char *readarr)
{
/* First byte is cmd which can not be sent through the FIFO. */
unsigned char cmd = *writearr++;
writecnt--;
msg_pspew("%s, cmd=0x%02x, writecnt=%d, readcnt=%d\n", __func__, cmd, writecnt, readcnt);
mmio_writeb(cmd, sb600_spibar + 0);
int ret = check_readwritecnt(flash, writecnt, readcnt);
if (ret != 0)
return ret;
/* This is a workaround for a bug in SPI controller. If we only send
* an opcode and no additional data/address, the SPI controller will
* read one byte too few from the chip. Basically, the last byte of
* the chip response is discarded and will not end up in the FIFO.
* It is unclear if the CS# line is set high too early as well.
*/
unsigned int readoffby1 = (writecnt > 0) ? 0 : 1;
uint8_t readwrite = (readcnt + readoffby1) << 4 | (writecnt);
mmio_writeb(readwrite, sb600_spibar + 1);
reset_internal_fifo_pointer();
msg_pspew("Filling FIFO: ");
int count;
for (count = 0; count < writecnt; count++) {
msg_pspew("[%02x]", writearr[count]);
mmio_writeb(writearr[count], sb600_spibar + 0xC);
}
msg_pspew("\n");
if (compare_internal_fifo_pointer(writecnt))
return SPI_PROGRAMMER_ERROR;
/*
* We should send the data in sequence, which means we need to reset
* the FIFO pointer to the first byte we want to send.
*/
reset_internal_fifo_pointer();
execute_command();
if (compare_internal_fifo_pointer(writecnt + readcnt))
return SPI_PROGRAMMER_ERROR;
/*
* After the command executed, we should find out the index of the
* received byte. Here we just reset the FIFO pointer and skip the
* writecnt.
* It would be possible to increase the FIFO pointer by one instead
* of reading and discarding one byte from the FIFO.
* The FIFO is implemented on top of an 8 byte ring buffer and the
* buffer is never cleared. For every byte that is shifted out after
* the opcode, the FIFO already stores the response from the chip.
* Usually, the chip will respond with 0x00 or 0xff.
*/
reset_internal_fifo_pointer();
/* Skip the bytes we sent. */
msg_pspew("Skipping: ");
for (count = 0; count < writecnt; count++) {
msg_pspew("[%02x]", mmio_readb(sb600_spibar + 0xC));
}
msg_pspew("\n");
if (compare_internal_fifo_pointer(writecnt))
return SPI_PROGRAMMER_ERROR;
msg_pspew("Reading FIFO: ");
for (count = 0; count < readcnt; count++) {
readarr[count] = mmio_readb(sb600_spibar + 0xC);
msg_pspew("[%02x]", readarr[count]);
}
msg_pspew("\n");
if (compare_internal_fifo_pointer(writecnt+readcnt))
return SPI_PROGRAMMER_ERROR;
if (mmio_readb(sb600_spibar + 1) != readwrite) {
msg_perr("Unexpected change in AMD SPI read/write count!\n");
msg_perr("Something else is accessing the flash chip and causes random corruption.\n"
"Please stop all applications and drivers and IPMI which access the flash chip.\n");
return SPI_PROGRAMMER_ERROR;
}
return 0;
}
