ARM: 6124/1: ep93xx: SPI driver platform support code

This patch adds platform side support code for the EP93xx SPI
driver. This includes clock, resources and muxing. There is a new
function: ep93xx_register_spi() which can be used by board support
code to register new SPI devices for the board.

This patch depends on patch
  5998/1 ep93xx: added chip revision reading function

Cc: Ryan Mallon <ryan@bluewatersys.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi>
Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Martin Guy <martinwguy@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 52 insertions, 0 deletions

diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index 8d3f77e9fa86..9092677f63eb 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -31,10 +31,12 @@
 #include <linux/amba/serial.h>
 #include <linux/i2c.h>
 #include <linux/i2c-gpio.h>
+#include <linux/spi/spi.h>
 
 #include <mach/hardware.h>
 #include <mach/fb.h>
 #include <mach/ep93xx_keypad.h>
+#include <mach/ep93xx_spi.h>
 
 #include <asm/mach/map.h>
 #include <asm/mach/time.h>
@@ -430,6 +432,56 @@ void __init ep93xx_register_i2c(struct i2c_gpio_platform_data *data,
         platform_device_register(&ep93xx_i2c_device);
 }
 
+/*************************************************************************
+ * EP93xx SPI peripheral handling
+ *************************************************************************/
+static struct ep93xx_spi_info ep93xx_spi_master_data;
+
+static struct resource ep93xx_spi_resources[] = {
+        {
+                .start  = EP93XX_SPI_PHYS_BASE,
+                .end    = EP93XX_SPI_PHYS_BASE + 0x18 - 1,
+                .flags  = IORESOURCE_MEM,
+        },
+        {
+                .start  = IRQ_EP93XX_SSP,
+                .end    = IRQ_EP93XX_SSP,
+                .flags  = IORESOURCE_IRQ,
+        },
+};
+
+static struct platform_device ep93xx_spi_device = {
+        .name           = "ep93xx-spi",
+        .id             = 0,
+        .dev            = {
+                .platform_data = &ep93xx_spi_master_data,
+        },
+        .num_resources  = ARRAY_SIZE(ep93xx_spi_resources),
+        .resource       = ep93xx_spi_resources,
+};
+
+/**
+ * ep93xx_register_spi() - registers spi platform device
+ * @info: ep93xx board specific spi master info (__initdata)
+ * @devices: SPI devices to register (__initdata)
+ * @num: number of SPI devices to register
+ *
+ * This function registers platform device for the EP93xx SPI controller and
+ * also makes sure that SPI pins are muxed so that I2S is not using those pins.
+ */
+void __init ep93xx_register_spi(struct ep93xx_spi_info *info,
+                                struct spi_board_info *devices, int num)
+{
+        /*
+         * When SPI is used, we need to make sure that I2S is muxed off from
+         * SPI pins.
+         */
+        ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONSSP);
+
+        ep93xx_spi_master_data = *info;
+        spi_register_board_info(devices, num);
+        platform_device_register(&ep93xx_spi_device);
+}
 
 /*************************************************************************
  * EP93xx LEDs