[U-Boot] [PATCH v2] spi: add altera spi controller support

Thomas Chou
2010-03-23T03:36:19Z

drivers/spi/altera_spi.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 82 insertions(+), 0 deletions(-)
create mode 100644 drivers/spi/altera_spi.c

diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index f112ed0..dfcbb8b 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -25,6 +25,7 @@ include $(TOPDIR)/config.mk

LIB := $(obj)libspi.a

+COBJS-$(CONFIG_ALTERA_SPI) += altera_spi.o
COBJS-$(CONFIG_ATMEL_DATAFLASH_SPI) += atmel_dataflash_spi.o
COBJS-$(CONFIG_ATMEL_SPI) += atmel_spi.o
COBJS-$(CONFIG_BFIN_SPI) += bfin_spi.o
diff --git a/drivers/spi/altera_spi.c b/drivers/spi/altera_spi.c
new file mode 100644
index 0000000..7a021d0
--- /dev/null
+++ b/drivers/spi/altera_spi.c
@@ -0,0 +1,81 @@
+/*
+ * Altera SPI driver
+ *
+ * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <common.h>
+#include <malloc.h>
+#include <spi.h>
+#include <asm/io.h>
+#include <nios2-io.h>
+
+static nios_spi_t *nios_spi = (nios_spi_t *)CONFIG_SYS_SPI_BASE;
+
+void spi_init (void)
+{
+ /* empty read buffer */
+ if (readl (&nios_spi->status) & NIOS_SPI_RRDY)
+ readl (&nios_spi->rxdata);
+ return;
+}
+
+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)
+{
+ int i, iter = bitlen >> 3;
+ const uchar *txp = dout;
+ uchar *rxp = din;
+ uchar d;
+
+ if (flags & SPI_XFER_BEGIN) {
+ writel (1 << slave->cs, &nios_spi->slaveselect);
+ writel (NIOS_SPI_SSO, &nios_spi->control);
+ }
+
+ for (i = 0; i < iter; i++) {
+ writel (txp ? txp[i] : 0, &nios_spi->txdata);
+ while (!(readl (&nios_spi->status) & NIOS_SPI_RRDY))
+ ;
+ d = readl (&nios_spi->rxdata);
+ if (rxp)
+ rxp[i] = d;
+ }
+ if (flags & SPI_XFER_END)
+ writel (0, &nios_spi->control);
+
+ return 0;
+}
--
1.6.6.1