mpc52xx: Add SPI driver.

Signed-off-by: Grzegorz Bernacki <gjb@semihalf.com>

diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 1350f3e0bff660a7b88e81497e38545ce621b23d..1272c17761a6656615ad502d77dbe4dc8a2eaf1a 100644 (file)
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -28,6 +28,7 @@ LIB   := $(obj)libspi.a
 COBJS-$(CONFIG_ATMEL_DATAFLASH_SPI) += atmel_dataflash_spi.o
 COBJS-$(CONFIG_ATMEL_SPI) += atmel_spi.o
 COBJS-$(CONFIG_BFIN_SPI) += bfin_spi.o
+COBJS-$(CONFIG_MPC52XX_SPI) += mpc52xx_spi.o
 COBJS-$(CONFIG_MPC8XXX_SPI) += mpc8xxx_spi.o
 COBJS-$(CONFIG_MXC_SPI) += mxc_spi.o
 COBJS-$(CONFIG_SOFT_SPI) += soft_spi.o

diff --git a/drivers/spi/mpc52xx_spi.c b/drivers/spi/mpc52xx_spi.c
new file mode 100644 (file)
index 0000000..3e96b3f
--- /dev/null
+++ b/drivers/spi/mpc52xx_spi.c
@@ -0,0 +1,109 @@
+/*
+ * (C) Copyright 2009
+ * Frank Bodammer <frank.bodammer@gcd-solutions.de>
+ * (C) Copyright 2009 Semihalf, Grzegorz Bernacki
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#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 = malloc(sizeof(struct spi_slave));
+       if (!slave)
+               return NULL;
+
+       slave->bus = bus;
+       slave->cs = cs;
+
+       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;
+}

diff --git a/include/mpc5xxx.h b/include/mpc5xxx.h
index 463d5ae4b1952789586b66c4c15de8aa9ac61f8c..476d1498ccf91198199a6ab9e30bb610bce13e3c 100644 (file)
--- a/include/mpc5xxx.h
+++ b/include/mpc5xxx.h
@@ -392,6 +392,24 @@
 #define I2C_IF         0x02
 #define I2C_RXAK       0x01
 
+/* SPI control register 1 bits */
+#define SPI_CR_LSBFE   0x01
+#define SPI_CR_SSOE    0x02
+#define SPI_CR_CPHA    0x04
+#define SPI_CR_CPOL    0x08
+#define SPI_CR_MSTR    0x10
+#define SPI_CR_SWOM    0x20
+#define SPI_CR_SPE     0x40
+#define SPI_CR_SPIE    0x80
+
+/* SPI status register bits */
+#define SPI_SR_MODF    0x10
+#define SPI_SR_WCOL    0x40
+#define SPI_SR_SPIF    0x80
+
+/* SPI port data register bits */
+#define SPI_PDR_SS     0x08
+
 /* Programmable Serial Controller (PSC) status register bits */
 #define PSC_SR_CDE             0x0080
 #define PSC_SR_RXRDY           0x0100