nios: Move cpu/nios/* to arch/nios/cpu/*

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>

1 files changed, 195 insertions, 0 deletions

diff --git a/arch/nios/cpu/spi.c b/arch/nios/cpu/spi.c
new file mode 100644
index 0000000..89f9797
--- /dev/null
+++ b/arch/nios/cpu/spi.c
@@ -0,0 +1,195 @@
+/*
+ * (C) Copyright 2004, Li-Pro.Net <www.li-pro.net>
+ * Stephan Linz <linz@li-pro.net>
+ *
+ * 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 <linux/ctype.h>
+
+#if defined(CONFIG_NIOS_SPI)
+#include <nios-io.h>
+#include <spi.h>
+
+#if !defined(CONFIG_SYS_NIOS_SPIBASE)
+#error "*** CONFIG_SYS_NIOS_SPIBASE not defined ***"
+#endif
+
+#if !defined(CONFIG_SYS_NIOS_SPIBITS)
+#error "*** CONFIG_SYS_NIOS_SPIBITS not defined ***"
+#endif
+
+#if (CONFIG_SYS_NIOS_SPIBITS != 8) && (CONFIG_SYS_NIOS_SPIBITS != 16)
+#error "*** CONFIG_SYS_NIOS_SPIBITS should be either 8 or 16 ***"
+#endif
+
+static nios_spi_t	*spi	= (nios_spi_t *)CONFIG_SYS_NIOS_SPIBASE;
+
+/* Warning:
+ * You cannot enable DEBUG for early system initalization, i. e. when
+ * this driver is used to read environment parameters like "baudrate"
+ * from EEPROM which are used to initialize the serial port which is
+ * needed to print the debug messages...
+ */
+#undef	DEBUG
+
+#ifdef  DEBUG
+
+#define	DPRINT(a)	printf a;
+/* -----------------------------------------------
+ * Helper functions to peek into tx and rx buffers
+ * ----------------------------------------------- */
+static const char * const hex_digit = "0123456789ABCDEF";
+
+static char quickhex (int i)
+{
+	return hex_digit[i];
+}
+
+static void memdump (const void *pv, int num)
+{
+	int i;
+	const unsigned char *pc = (const unsigned char *) pv;
+
+	for (i = 0; i < num; i++)
+		printf ("%c%c ", quickhex (pc[i] >> 4), quickhex (pc[i] & 0x0f));
+	printf ("\t");
+	for (i = 0; i < num; i++)
+		printf ("%c", isprint (pc[i]) ? pc[i] : '.');
+	printf ("\n");
+}
+#else   /* !DEBUG */
+
+#define	DPRINT(a)
+#define	memdump(p,n)
+
+#endif  /* DEBUG */
+
+
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+		unsigned int max_hz, unsigned int mode)
+{
+	struct spi_slave *slave;
+
+	if (!spi_cs_is_valid(bus, cs))
+		return NULL;
+
+	slave = malloc(sizeof(struct spi_slave));
+	if (!slave)
+		return NULL;
+
+	slave->bus = bus;
+	slave->cs = cs;
+
+	/* TODO: Add support for different modes and speeds */
+
+	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)
+{
+
+}
+
+/*
+ * SPI transfer:
+ *
+ * See include/spi.h and http://www.altera.com/literature/ds/ds_nios_spi.pdf
+ * for more informations.
+ */
+int spi_xfer(struct spi_slave *slave, int bitlen, const void *dout,
+		void *din, unsigned long flags)
+{
+	const u8 *txd = dout;
+	u8 *rxd = din;
+	int j;
+
+	DPRINT(("spi_xfer: slave %u:%u dout %08X din %08X bitlen %d\n",
+		slave->bus, slave->cs, *(uint *)dout, *(uint *)din, bitlen));
+
+	memdump(dout, (bitlen + 7) / 8);
+
+	if (flags & SPI_XFER_BEGIN)
+		spi_cs_activate(slave);
+
+	if (!(flags & SPI_XFER_END) || bitlen > CONFIG_SYS_NIOS_SPIBITS) {
+		/* leave chip select active */
+		spi->control |= NIOS_SPI_SSO;
+	}
+
+	for (	j = 0;				/* count each byte in */
+		j < ((bitlen + 7) / 8);		/* dout[] and din[] */
+
+#if	(CONFIG_SYS_NIOS_SPIBITS == 8)
+		j++) {
+
+		while ((spi->status & NIOS_SPI_TRDY) == 0)
+			;
+		spi->txdata = (unsigned)(txd[j]);
+
+		while ((spi->status & NIOS_SPI_RRDY) == 0)
+			;
+		rxd[j] = (unsigned char)(spi->rxdata & 0xff);
+
+#elif	(CONFIG_SYS_NIOS_SPIBITS == 16)
+		j++, j++) {
+
+		while ((spi->status & NIOS_SPI_TRDY) == 0)
+			;
+		if ((j+1) < ((bitlen + 7) / 8))
+			spi->txdata = (unsigned)((txd[j] << 8) | txd[j+1]);
+		else
+			spi->txdata = (unsigned)(txd[j] << 8);
+
+		while ((spi->status & NIOS_SPI_RRDY) == 0)
+			;
+		rxd[j] = (unsigned char)((spi->rxdata >> 8) & 0xff);
+		if ((j+1) < ((bitlen + 7) / 8))
+			rxd[j+1] = (unsigned char)(spi->rxdata & 0xff);
+
+#else
+#error "*** unsupported value of CONFIG_SYS_NIOS_SPIBITS ***"
+#endif
+
+	}
+
+	if (bitlen > CONFIG_SYS_NIOS_SPIBITS && (flags & SPI_XFER_END)) {
+		spi->control &= ~NIOS_SPI_SSO;
+	}
+
+	if (flags & SPI_XFER_END)
+		spi_cs_deactivate(slave);
+
+	memdump(din, (bitlen + 7) / 8);
+
+	return 0;
+}
+
+#endif /* CONFIG_NIOS_SPI */