spi: add altera spi controller support

This patch adds the driver of altera spi controller, which is
used as epcs/spi flash controller. It also works with mmc_spi
driver.

This driver support more than one spi bus, with base list declared
#define CONFIG_SYS_ALTERA_SPI_LIST { BASE_0,BASE_1,... }

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Tested-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Scott McNutt <smcnutt@psyent.com>

diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index f112ed00d0c841f78e45566f3277b5547b9e5e61..dfcbb8b46f48ca93e97088bfdccb6bc56b0fe3c8 100644 (file)
--- 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 (file)
index 0000000..918b223
--- /dev/null
+++ b/drivers/spi/altera_spi.c
@@ -0,0 +1,165 @@
+/*
+ * Altera SPI driver
+ *
+ * based on bfin_spi.c
+ * Copyright (c) 2005-2008 Analog Devices Inc.
+ * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * Licensed under the GPL-2 or later.
+ */
+#include <common.h>
+#include <asm/io.h>
+#include <malloc.h>
+#include <spi.h>
+
+#define ALTERA_SPI_RXDATA      0
+#define ALTERA_SPI_TXDATA      4
+#define ALTERA_SPI_STATUS      8
+#define ALTERA_SPI_CONTROL     12
+#define ALTERA_SPI_SLAVE_SEL   20
+
+#define ALTERA_SPI_STATUS_ROE_MSK      (0x8)
+#define ALTERA_SPI_STATUS_TOE_MSK      (0x10)
+#define ALTERA_SPI_STATUS_TMT_MSK      (0x20)
+#define ALTERA_SPI_STATUS_TRDY_MSK     (0x40)
+#define ALTERA_SPI_STATUS_RRDY_MSK     (0x80)
+#define ALTERA_SPI_STATUS_E_MSK        (0x100)
+
+#define ALTERA_SPI_CONTROL_IROE_MSK    (0x8)
+#define ALTERA_SPI_CONTROL_ITOE_MSK    (0x10)
+#define ALTERA_SPI_CONTROL_ITRDY_MSK   (0x40)
+#define ALTERA_SPI_CONTROL_IRRDY_MSK   (0x80)
+#define ALTERA_SPI_CONTROL_IE_MSK      (0x100)
+#define ALTERA_SPI_CONTROL_SSO_MSK     (0x400)
+
+#ifndef CONFIG_SYS_ALTERA_SPI_LIST
+#define CONFIG_SYS_ALTERA_SPI_LIST { CONFIG_SYS_SPI_BASE }
+#endif
+
+static ulong altera_spi_base_list[] = CONFIG_SYS_ALTERA_SPI_LIST;
+
+struct altera_spi_slave {
+       struct spi_slave slave;
+       ulong base;
+};
+#define to_altera_spi_slave(s) container_of(s, struct altera_spi_slave, slave)
+
+__attribute__((weak))
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+       return bus < ARRAY_SIZE(altera_spi_base_list) && cs < 32;
+}
+
+__attribute__((weak))
+void spi_cs_activate(struct spi_slave *slave)
+{
+       struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
+       writel(1 << slave->cs, altspi->base + ALTERA_SPI_SLAVE_SEL);
+       writel(ALTERA_SPI_CONTROL_SSO_MSK, altspi->base + ALTERA_SPI_CONTROL);
+}
+
+__attribute__((weak))
+void spi_cs_deactivate(struct spi_slave *slave)
+{
+       struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
+       writel(0, altspi->base + ALTERA_SPI_CONTROL);
+       writel(0, altspi->base + ALTERA_SPI_SLAVE_SEL);
+}
+
+void spi_init(void)
+{
+}
+
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+                                 unsigned int max_hz, unsigned int mode)
+{
+       struct altera_spi_slave *altspi;
+
+       if (!spi_cs_is_valid(bus, cs))
+               return NULL;
+
+       altspi = malloc(sizeof(*altspi));
+       if (!altspi)
+               return NULL;
+
+       altspi->slave.bus = bus;
+       altspi->slave.cs = cs;
+       altspi->base = altera_spi_base_list[bus];
+       debug("%s: bus:%i cs:%i base:%lx\n", __func__,
+               bus, cs, altspi->base);
+
+       return &altspi->slave;
+}
+
+void spi_free_slave(struct spi_slave *slave)
+{
+       struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
+       free(altspi);
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+       struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
+
+       debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs);
+       writel(0, altspi->base + ALTERA_SPI_CONTROL);
+       writel(0, altspi->base + ALTERA_SPI_SLAVE_SEL);
+       return 0;
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+       struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
+
+       debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs);
+       writel(0, altspi->base + ALTERA_SPI_SLAVE_SEL);
+}
+
+#ifndef CONFIG_ALTERA_SPI_IDLE_VAL
+# define CONFIG_ALTERA_SPI_IDLE_VAL 0xff
+#endif
+
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
+            void *din, unsigned long flags)
+{
+       struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
+       /* assume spi core configured to do 8 bit transfers */
+       uint bytes = bitlen / 8;
+       const uchar *txp = dout;
+       uchar *rxp = din;
+
+       debug("%s: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx\n", __func__,
+               slave->bus, slave->cs, bitlen, bytes, flags);
+       if (bitlen == 0)
+               goto done;
+
+       if (bitlen % 8) {
+               flags |= SPI_XFER_END;
+               goto done;
+       }
+
+       /* empty read buffer */
+       if (readl(altspi->base + ALTERA_SPI_STATUS) &
+           ALTERA_SPI_STATUS_RRDY_MSK)
+               readl(altspi->base + ALTERA_SPI_RXDATA);
+       if (flags & SPI_XFER_BEGIN)
+               spi_cs_activate(slave);
+
+       while (bytes--) {
+               uchar d = txp ? *txp++ : CONFIG_ALTERA_SPI_IDLE_VAL;
+               debug("%s: tx:%x ", __func__, d);
+               writel(d, altspi->base + ALTERA_SPI_TXDATA);
+               while (!(readl(altspi->base + ALTERA_SPI_STATUS) &
+                        ALTERA_SPI_STATUS_RRDY_MSK))
+                       ;
+               d = readl(altspi->base + ALTERA_SPI_RXDATA);
+               if (rxp)
+                       *rxp++ = d;
+               debug("rx:%x\n", d);
+       }
+ done:
+       if (flags & SPI_XFER_END)
+               spi_cs_deactivate(slave);
+
+       return 0;
+}