1 files changed, 93 insertions, 31 deletions

diff --git a/common/soft_spi.c b/common/soft_spi.c
index e425061..c131650 100644
--- a/common/soft_spi.c
+++ b/common/soft_spi.c
@@ -29,6 +29,8 @@
 
 #if defined(CONFIG_SOFT_SPI)
 
+#include <malloc.h>
+
 /*-----------------------------------------------------------------------
  * Definitions
  */
@@ -39,6 +41,15 @@
 #define PRINTD(fmt,args...)
 #endif
 
+struct soft_spi_slave {
+	struct spi_slave slave;
+	unsigned int mode;
+};
+
+static inline struct soft_spi_slave *to_soft_spi(struct spi_slave *slave)
+{
+	return container_of(slave, struct soft_spi_slave, slave);
+}
 
 /*=====================================================================*/
 /*                         Public Functions                            */
@@ -56,6 +67,57 @@ void spi_init (void)
 #endif
 }
 
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+		unsigned int max_hz, unsigned int mode)
+{
+	struct soft_spi_slave *ss;
+
+	if (!spi_cs_is_valid(bus, cs))
+		return NULL;
+
+	ss = malloc(sizeof(struct soft_spi_slave));
+	if (!ss)
+		return NULL;
+
+	ss->slave.bus = bus;
+	ss->slave.cs = cs;
+	ss->mode = mode;
+
+	/* TODO: Use max_hz to limit the SCK rate */
+
+	return &ss->slave;
+}
+
+void spi_free_slave(struct spi_slave *slave)
+{
+	struct soft_spi_slave *ss = to_soft_spi(slave);
+
+	free(ss);
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+#ifdef CFG_IMMR
+	volatile immap_t *immr = (immap_t *)CFG_IMMR;
+#endif
+	struct soft_spi_slave *ss = to_soft_spi(slave);
+
+	/*
+	 * Make sure the SPI clock is in idle state as defined for
+	 * this slave.
+	 */
+	if (ss->mode & SPI_CPOL)
+		SPI_SCL(1);
+	else
+		SPI_SCL(0);
+
+	return 0;
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+	/* Nothing to do */
+}
 
 /*-----------------------------------------------------------------------
  * SPI transfer
@@ -68,50 +130,54 @@ void spi_init (void)
  * and "din" can point to the same memory location, in which case the
  * input data overwrites the output data (since both are buffered by
  * temporary variables, this is OK).
- *
- * If the chipsel() function is not NULL, it is called with a parameter
- * of '1' (chip select active) at the start of the transfer and again with
- * a parameter of '0' at the end of the transfer.
- *
- * If the chipsel() function _is_ NULL, it the responsibility of the
- * caller to make the appropriate chip select active before calling
- * spi_xfer() and making it inactive after spi_xfer() returns.
  */
-int  spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din)
+int  spi_xfer(struct spi_slave *slave, unsigned int bitlen,
+		const void *dout, void *din, unsigned long flags)
 {
 #ifdef CFG_IMMR
 	volatile immap_t *immr = (immap_t *)CFG_IMMR;
 #endif
-	uchar tmpdin  = 0;
-	uchar tmpdout = 0;
-	int   j;
+	struct soft_spi_slave *ss = to_soft_spi(slave);
+	uchar		tmpdin  = 0;
+	uchar		tmpdout = 0;
+	const u8	*txd = dout;
+	u8		*rxd = din;
+	int		cpol = ss->mode & SPI_CPOL;
+	int		cpha = ss->mode & SPI_CPHA;
+	unsigned int	j;
 
-	PRINTD("spi_xfer: chipsel %08X dout %08X din %08X bitlen %d\n",
-		(int)chipsel, *(uint *)dout, *(uint *)din, bitlen);
+	PRINTD("spi_xfer: slave %u:%u dout %08X din %08X bitlen %u\n",
+		slave->bus, slave->cs, *(uint *)txd, *(uint *)rxd, bitlen);
 
-	if(chipsel != NULL) {
-		(*chipsel)(1);	/* select the target chip */
-	}
+	if (flags & SPI_XFER_BEGIN)
+		spi_cs_activate(slave);
 
 	for(j = 0; j < bitlen; j++) {
 		/*
 		 * Check if it is time to work on a new byte.
 		 */
 		if((j % 8) == 0) {
-			tmpdout = *dout++;
+			tmpdout = *txd++;
 			if(j != 0) {
-				*din++ = tmpdin;
+				*rxd++ = tmpdin;
 			}
 			tmpdin  = 0;
 		}
-		SPI_SCL(0);
+
+		if (!cpha)
+			SPI_SCL(!cpol);
 		SPI_SDA(tmpdout & 0x80);
 		SPI_DELAY;
-		SPI_SCL(1);
+		if (cpha)
+			SPI_SCL(!cpol);
+		else
+			SPI_SCL(cpol);
+		tmpdin	<<= 1;
+		tmpdin	|= SPI_READ;
+		tmpdout	<<= 1;
 		SPI_DELAY;
-		tmpdin  <<= 1;
-		tmpdin   |= SPI_READ;
-		tmpdout <<= 1;
+		if (cpha)
+			SPI_SCL(cpol);
 	}
 	/*
 	 * If the number of bits isn't a multiple of 8, shift the last
@@ -120,14 +186,10 @@ int  spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din)
 	 */
 	if((bitlen % 8) != 0)
 		tmpdin <<= 8 - (bitlen % 8);
-	*din++ = tmpdin;
-
-	SPI_SCL(0);		/* SPI wants the clock left low for idle */
+	*rxd++ = tmpdin;
 
-	if(chipsel != NULL) {
-		(*chipsel)(0);	/* deselect the target chip */
-
-	}
+	if (flags & SPI_XFER_END)
+		spi_cs_deactivate(slave);
 
 	return(0);
 }