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soc/sifive/fu540: test and fix code of fu540 spi 

I tested the SPI through the SD card and fixed sd card communication problem.
Added two functions (claim_bus and release_bus). Setting CS signal is invalid by
default.

Change-Id: I60033a148c21bbd5b4946580f6cab0b439d346c6
Signed-off-by: Xiang Wang <merle@hardenedlinux.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35117
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
This commit is contained in:
Xiang Wang 2019-08-27 15:28:26 +08:00 committed by Patrick Georgi
parent ee0b7ad683
commit 4a8fba9ea5
1 changed files with 27 additions and 2 deletions
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29
src/soc/sifive/fu540/spi.c
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@ -61,6 +61,25 @@ static uint8_t spi_rx(volatile struct spi_ctrl *spictrl)
return (uint8_t) out;
}
static int spi_claim_bus_(const struct spi_slave *slave)
{
struct spi_ctrl *spictrl = spictrls[slave->bus];
spi_reg_csmode csmode;
csmode.raw_bits = 0;
csmode.mode = FU540_SPI_CSMODE_HOLD;
write32(&spictrl->csmode.raw_bits, csmode.raw_bits);
return 0;
}
static void spi_release_bus_(const struct spi_slave *slave)
{
struct spi_ctrl *spictrl = spictrls[slave->bus];
spi_reg_csmode csmode;
csmode.raw_bits = 0;
csmode.mode = FU540_SPI_CSMODE_OFF;
write32(&spictrl->csmode.raw_bits, csmode.raw_bits);
}
static int spi_xfer_(const struct spi_slave *slave,
const void *dout, size_t bytesout,
void *din, size_t bytesin)
@ -126,6 +145,8 @@ static int spi_setup_(const struct spi_slave *slave)
sckmode.pol = FU540_SPI_POL_LEADING;
write32(&spictrl->sckmode.raw_bits, sckmode.raw_bits);
write32(&spictrl->csdef, 0xffffffff);
csmode.raw_bits = 0;
csmode.mode = FU540_SPI_CSMODE_AUTO;
write32(&spictrl->csmode.raw_bits, csmode.raw_bits);
@ -133,7 +154,7 @@ static int spi_setup_(const struct spi_slave *slave)
fmt.raw_bits = 0;
fmt.proto = FU540_SPI_PROTO_S;
fmt.endian = FU540_SPI_ENDIAN_BIG;
fmt.dir = 1;
fmt.dir = 0;
fmt.len = 8;
write32(&spictrl->fmt.raw_bits, fmt.raw_bits);
@ -143,6 +164,8 @@ static int spi_setup_(const struct spi_slave *slave)
struct spi_ctrlr fu540_spi_ctrlr = {
.xfer = spi_xfer_,
.setup = spi_setup_,
.claim_bus = spi_claim_bus_,
.release_bus = spi_release_bus_,
};
const struct spi_ctrlr_buses spi_ctrlr_bus_map[] = {
@ -187,6 +210,8 @@ int fu540_spi_setup(unsigned int bus, unsigned int cs,
sckmode.pol = config->pol;
write32(&spictrl->sckmode.raw_bits, sckmode.raw_bits);
write32(&spictrl->csdef, 0xffffffff);
csmode.raw_bits = 0;
csmode.mode = FU540_SPI_CSMODE_AUTO;
write32(&spictrl->csmode.raw_bits, csmode.raw_bits);
@ -194,7 +219,7 @@ int fu540_spi_setup(unsigned int bus, unsigned int cs,
fmt.raw_bits = 0;
fmt.proto = config->protocol;
fmt.endian = config->endianness;
fmt.dir = 1;
fmt.dir = 0;
fmt.len = config->bits_per_frame;
write32(&spictrl->fmt.raw_bits, fmt.raw_bits);