[U-Boot] [PATCH] spi: kirkwood_spi: Add support for multiple chip-selects on MVEBU

[Stefan Roese <sr@denx.de>]

Currently only chip-select 0 is supported by the kirkwood SPI driver.
The Armada XP / 38x SoCs also use this driver and support multiple chip
selects. This patch adds support for multiple CS on MVEBU.

The register definitions are restructured a bit with this patch. Grouping
them to the corresponding registers.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Cc: Jagan Teki <jteki@openedev.com>
---
 arch/arm/include/asm/arch-mvebu/spi.h | 17 ++++++++++++-----
 drivers/spi/kirkwood_spi.c            |  6 ++++++
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/arch/arm/include/asm/arch-mvebu/spi.h b/arch/arm/include/asm/arch-mvebu/spi.h
index e512dce..4b66499 100644
--- a/arch/arm/include/asm/arch-mvebu/spi.h
+++ b/arch/arm/include/asm/arch-mvebu/spi.h
@@ -32,13 +32,15 @@ struct kwspi_registers {
 #define SCK_MPP10	(1 << 1)
 #define MISO_MPP11	(1 << 2)
 
+/* Control Register */
+#define KWSPI_CSN_ACT		(1 << 0) /* Activates serial memory interface */
+#define KWSPI_SMEMRDY		(1 << 1) /* SerMem Data xfer ready */
+#define KWSPI_CS_SHIFT		2	/* chip select shift */
+#define KWSPI_CS_MASK		0x7	/* chip select mask */
+
+/* Configuration Register */
 #define KWSPI_CLKPRESCL_MASK	0x1f
 #define KWSPI_CLKPRESCL_MIN	0x12
-#define KWSPI_CSN_ACT		1 /* Activates serial memory interface */
-#define KWSPI_SMEMRDY		(1 << 1) /* SerMem Data xfer ready */
-#define KWSPI_IRQUNMASK		1 /* unmask SPI interrupt */
-#define KWSPI_IRQMASK		0 /* mask SPI interrupt */
-#define KWSPI_SMEMRDIRQ		1 /* SerMem data xfer ready irq */
 #define KWSPI_XFERLEN_1BYTE	0
 #define KWSPI_XFERLEN_2BYTE	(1 << 5)
 #define KWSPI_XFERLEN_MASK	(1 << 5)
@@ -47,6 +49,11 @@ struct kwspi_registers {
 #define KWSPI_ADRLEN_3BYTE	(2 << 8)
 #define KWSPI_ADRLEN_4BYTE	(3 << 8)
 #define KWSPI_ADRLEN_MASK	(3 << 8)
+
+#define KWSPI_IRQUNMASK		1 /* unmask SPI interrupt */
+#define KWSPI_IRQMASK		0 /* mask SPI interrupt */
+#define KWSPI_SMEMRDIRQ		1 /* SerMem data xfer ready irq */
+
 #define KWSPI_TIMEOUT		10000
 
 #endif /* __KW_SPI_H__ */
diff --git a/drivers/spi/kirkwood_spi.c b/drivers/spi/kirkwood_spi.c
index 7890796..fa30be4 100644
--- a/drivers/spi/kirkwood_spi.c
+++ b/drivers/spi/kirkwood_spi.c
@@ -280,6 +280,12 @@ static int mvebu_spi_xfer(struct udevice *dev, unsigned int bitlen,
 	struct udevice *bus = dev->parent;
 	struct mvebu_spi_platdata *plat = dev_get_platdata(bus);
 
+#ifdef CONFIG_ARCH_MVEBU
+	clrsetbits_le32(&plat->spireg->ctrl,
+			KWSPI_CS_MASK << KWSPI_CS_SHIFT,
+			spi_chip_select(dev) << KWSPI_CS_SHIFT);
+#endif
+
 	return _spi_xfer(plat->spireg, bitlen, dout, din, flags);
 }
 
-- 
2.7.1