commit b48c4e3c944e8c52dcb0f477e9d80da045c7cab4
author Andreas Larsson <andreas@gaisler.com> Fri Feb 15 16:52:23 2013 +0100
committer Grant Likely <grant.likely@secretlab.ca> Sun Apr 07 10:07:55 2013 +0100
tree eff07b425dbacd77730328b7ca8cdd69670ea052
parent f482cd0ff506cd74c75edceec4b737c46c60cb12

spi/spi-fsl-spi: Move setting non-zero tx and rx shifts to a function accessed by a function pointer

Acked-by: Anton Vorontsov <anton@enomsg.org>
Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/spi/spi-fsl-lib.h

diff --git a/drivers/spi/spi-fsl-lib.h b/drivers/spi/spi-fsl-lib.h
index d785595..eae54b6 100644
--- a/drivers/spi/spi-fsl-lib.h
+++ b/drivers/spi/spi-fsl-lib.h
@@ -69,6 +69,11 @@
 
 	unsigned int flags;
 
+#ifdef CONFIG_SPI_FSL_SPI
+	void (*set_shifts)(u32 *rx_shift, u32 *tx_shift,
+			   int bits_per_word, int msb_first);
+#endif
+
 	struct workqueue_struct *workqueue;
 	struct work_struct work;
 

drivers/spi/spi-fsl-spi.c

diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c
index 1569f7d..aba00fd0 100644
--- a/drivers/spi/spi-fsl-spi.c
+++ b/drivers/spi/spi-fsl-spi.c
@@ -91,6 +91,25 @@
 	}
 }
 
+static void fsl_spi_qe_cpu_set_shifts(u32 *rx_shift, u32 *tx_shift,
+				      int bits_per_word, int msb_first)
+{
+	*rx_shift = 0;
+	*tx_shift = 0;
+	if (msb_first) {
+		if (bits_per_word <= 8) {
+			*rx_shift = 16;
+			*tx_shift = 24;
+		} else if (bits_per_word <= 16) {
+			*rx_shift = 16;
+			*tx_shift = 16;
+		}
+	} else {
+		if (bits_per_word <= 8)
+			*rx_shift = 8;
+	}
+}
+
 static int mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs,
 				struct spi_device *spi,
 				struct mpc8xxx_spi *mpc8xxx_spi,
@@ -101,31 +120,20 @@
 	if (bits_per_word <= 8) {
 		cs->get_rx = mpc8xxx_spi_rx_buf_u8;
 		cs->get_tx = mpc8xxx_spi_tx_buf_u8;
-		if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
-			cs->rx_shift = 16;
-			cs->tx_shift = 24;
-		}
 	} else if (bits_per_word <= 16) {
 		cs->get_rx = mpc8xxx_spi_rx_buf_u16;
 		cs->get_tx = mpc8xxx_spi_tx_buf_u16;
-		if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
-			cs->rx_shift = 16;
-			cs->tx_shift = 16;
-		}
 	} else if (bits_per_word <= 32) {
 		cs->get_rx = mpc8xxx_spi_rx_buf_u32;
 		cs->get_tx = mpc8xxx_spi_tx_buf_u32;
 	} else
 		return -EINVAL;
 
-	if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE &&
-	    spi->mode & SPI_LSB_FIRST) {
-		cs->tx_shift = 0;
-		if (bits_per_word <= 8)
-			cs->rx_shift = 8;
-		else
-			cs->rx_shift = 0;
-	}
+	if (mpc8xxx_spi->set_shifts)
+		mpc8xxx_spi->set_shifts(&cs->rx_shift, &cs->tx_shift,
+					bits_per_word,
+					!(spi->mode & SPI_LSB_FIRST));
+
 	mpc8xxx_spi->rx_shift = cs->rx_shift;
 	mpc8xxx_spi->tx_shift = cs->tx_shift;
 	mpc8xxx_spi->get_rx = cs->get_rx;
@@ -487,10 +495,13 @@
 	if (ret)
 		goto err_cpm_init;
 
-	if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
-		mpc8xxx_spi->rx_shift = 16;
-		mpc8xxx_spi->tx_shift = 24;
-	}
+	if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
+		mpc8xxx_spi->set_shifts = fsl_spi_qe_cpu_set_shifts;
+
+	if (mpc8xxx_spi->set_shifts)
+		/* 8 bits per word and MSB first */
+		mpc8xxx_spi->set_shifts(&mpc8xxx_spi->rx_shift,
+					&mpc8xxx_spi->tx_shift, 8, 1);
 
 	mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem));
 	if (mpc8xxx_spi->reg_base == NULL) {