mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 10:48:51 +00:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
90 lines
2 KiB
C
90 lines
2 KiB
C
/*
|
|
* (C) Copyright 2009
|
|
* Frank Bodammer <frank.bodammer@gcd-solutions.de>
|
|
* (C) Copyright 2009 Semihalf, Grzegorz Bernacki
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/io.h>
|
|
#include <malloc.h>
|
|
#include <spi.h>
|
|
#include <mpc5xxx.h>
|
|
|
|
void spi_init(void)
|
|
{
|
|
struct mpc5xxx_spi *spi = (struct mpc5xxx_spi *)MPC5XXX_SPI;
|
|
/*
|
|
* Its important to use the correct order when initializing the
|
|
* registers
|
|
*/
|
|
out_8(&spi->ddr, 0x0F); /* set all SPI pins as output */
|
|
out_8(&spi->pdr, 0x00); /* set SS low */
|
|
/* SPI is master, SS is general purpose output */
|
|
out_8(&spi->cr1, SPI_CR_MSTR | SPI_CR_SPE);
|
|
out_8(&spi->cr2, 0x00); /* normal operation */
|
|
out_8(&spi->brr, 0x77); /* baud rate: IPB clock / 2048 */
|
|
}
|
|
|
|
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
|
|
unsigned int max_hz, unsigned int mode)
|
|
{
|
|
struct spi_slave *slave;
|
|
|
|
slave = spi_alloc_slave_base(bus, cs);
|
|
if (!slave)
|
|
return NULL;
|
|
|
|
return slave;
|
|
}
|
|
|
|
void spi_free_slave(struct spi_slave *slave)
|
|
{
|
|
free(slave);
|
|
}
|
|
|
|
int spi_claim_bus(struct spi_slave *slave)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void spi_release_bus(struct spi_slave *slave)
|
|
{
|
|
return;
|
|
}
|
|
|
|
int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
|
|
void *din, unsigned long flags)
|
|
{
|
|
struct mpc5xxx_spi *spi = (struct mpc5xxx_spi *)MPC5XXX_SPI;
|
|
int i, iter = bitlen >> 3;
|
|
const uchar *txp = dout;
|
|
uchar *rxp = din;
|
|
|
|
debug("spi_xfer: slave %u:%u dout %08X din %08X bitlen %u\n",
|
|
slave->bus, slave->cs, *(uint *) dout, *(uint *) din, bitlen);
|
|
|
|
if (flags & SPI_XFER_BEGIN)
|
|
setbits_8(&spi->pdr, SPI_PDR_SS);
|
|
|
|
for (i = 0; i < iter; i++) {
|
|
udelay(1000);
|
|
debug("spi_xfer: sending %x\n", txp[i]);
|
|
out_8(&spi->dr, txp[i]);
|
|
while (!(in_8(&spi->sr) & SPI_SR_SPIF)) {
|
|
udelay(1000);
|
|
if (in_8(&spi->sr) & SPI_SR_WCOL) {
|
|
rxp[i] = in_8(&spi->dr);
|
|
puts("spi_xfer: write collision\n");
|
|
return -1;
|
|
}
|
|
}
|
|
rxp[i] = in_8(&spi->dr);
|
|
debug("spi_xfer: received %x\n", rxp[i]);
|
|
}
|
|
if (flags & SPI_XFER_END)
|
|
clrbits_8(&spi->pdr, SPI_PDR_SS);
|
|
|
|
return 0;
|
|
}
|