110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/*
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* (C) Copyright 2009
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* Frank Bodammer <frank.bodammer@gcd-solutions.de>
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* (C) Copyright 2009 Semihalf, Grzegorz Bernacki
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <malloc.h>
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#include <spi.h>
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#include <mpc5xxx.h>
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void spi_init(void)
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{
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struct mpc5xxx_spi *spi = (struct mpc5xxx_spi *)MPC5XXX_SPI;
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/*
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* Its important to use the correct order when initializing the
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* registers
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*/
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out_8(&spi->ddr, 0x0F); /* set all SPI pins as output */
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out_8(&spi->pdr, 0x00); /* set SS low */
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/* SPI is master, SS is general purpose output */
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out_8(&spi->cr1, SPI_CR_MSTR | SPI_CR_SPE);
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out_8(&spi->cr2, 0x00); /* normal operation */
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out_8(&spi->brr, 0x77); /* baud rate: IPB clock / 2048 */
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}
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struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
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unsigned int max_hz, unsigned int mode)
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{
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struct spi_slave *slave;
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slave = malloc(sizeof(struct spi_slave));
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if (!slave)
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return NULL;
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slave->bus = bus;
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slave->cs = cs;
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return slave;
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}
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void spi_free_slave(struct spi_slave *slave)
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{
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free(slave);
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}
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int spi_claim_bus(struct spi_slave *slave)
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{
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return 0;
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}
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void spi_release_bus(struct spi_slave *slave)
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{
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return;
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}
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int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
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void *din, unsigned long flags)
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{
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struct mpc5xxx_spi *spi = (struct mpc5xxx_spi *)MPC5XXX_SPI;
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int i, iter = bitlen >> 3;
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const uchar *txp = dout;
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uchar *rxp = din;
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debug("spi_xfer: slave %u:%u dout %08X din %08X bitlen %u\n",
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slave->bus, slave->cs, *(uint *) dout, *(uint *) din, bitlen);
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if (flags & SPI_XFER_BEGIN)
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setbits_8(&spi->pdr, SPI_PDR_SS);
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for (i = 0; i < iter; i++) {
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udelay(1000);
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debug("spi_xfer: sending %x\n", txp[i]);
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out_8(&spi->dr, txp[i]);
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while (!(in_8(&spi->sr) & SPI_SR_SPIF)) {
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udelay(1000);
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if (in_8(&spi->sr) & SPI_SR_WCOL) {
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rxp[i] = in_8(&spi->dr);
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puts("spi_xfer: write collision\n");
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return -1;
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}
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}
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rxp[i] = in_8(&spi->dr);
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debug("spi_xfer: received %x\n", rxp[i]);
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}
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if (flags & SPI_XFER_END)
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clrbits_8(&spi->pdr, SPI_PDR_SS);
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return 0;
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}
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