ARM: OMAP: Add SPI master driver for OMAP1 uWire controller

The converted driver originated from David Brownell, with some
modifications by Imre.
Signed-off-by: Imre Deak <imre.deak@nokia.com>
Signed-off-by: Juha Yrjl <juha.yrjola@nokia.com>

arch/arm/plat-omap/devices.c

@@ -297,6 +297,55 @@ static void __init omap_init_mmc(void)
 static inline void omap_init_mmc(void) {}
 #endif
 
+/*-------------------------------------------------------------------------*/
+
+/* Numbering for the SPI-capable controllers when used for SPI:
+ * spi		= 1
+ * uwire	= 2
+ * mmc1..2	= 3..4
+ * mcbsp1..3	= 5..7
+ */
+
+#if defined(CONFIG_SPI_OMAP_UWIRE) || defined(CONFIG_SPI_OMAP_UWIRE_MODULE)
+
+#define	OMAP_UWIRE_BASE		0xfffb3000
+
+static struct resource uwire_resources[] = {
+	{
+		.start		= OMAP_UWIRE_BASE,
+		.end		= OMAP_UWIRE_BASE + 0x20,
+		.flags		= IORESOURCE_MEM,
+	},
+};
+
+static struct platform_device omap_uwire_device = {
+	.name	   = "omap_uwire",
+	.id	     = -1,
+	.dev = {
+		.release	= omap_nop_release,
+	},
+	.num_resources	= ARRAY_SIZE(uwire_resources),
+	.resource	= uwire_resources,
+};
+
+static void omap_init_uwire(void)
+{
+	/* FIXME define and use a boot tag; not all boards will be hooking
+	 * up devices to the microwire controller, and multi-board configs
+	 * mean that CONFIG_SPI_OMAP_UWIRE may be configured anyway...
+	 */
+
+	/* board-specific code must configure chipselects (only a few
+	 * are normally used) and SCLK/SDI/SDO (each has two choices).
+	 */
+	(void) platform_device_register(&omap_uwire_device);
+}
+#else
+static inline void omap_init_uwire(void) {}
+#endif
+
+/*-------------------------------------------------------------------------*/
+
 #if	defined(CONFIG_OMAP_WATCHDOG) || defined(CONFIG_OMAP_WATCHDOG_MODULE)
 
 #ifdef CONFIG_ARCH_OMAP24XX
@@ -430,6 +479,7 @@ static int __init omap_init_devices(void)
 	omap_init_i2c();
 	omap_init_kp();
 	omap_init_mmc();
+	omap_init_uwire();
 	omap_init_wdt();
 	omap_init_rng();
 

drivers/spi/Kconfig

@@ -85,6 +85,13 @@ config SPI_BUTTERFLY
 	  inexpensive battery powered microcontroller evaluation board.
 	  This same cable can be used to flash new firmware.
 
+config SPI_OMAP_UWIRE
+	tristate "OMAP MicroWire"
+	depends on SPI_MASTER && ARCH_OMAP
+	select SPI_BITBANG
+	help
+	  This hooks up to the MicroWire controller on OMAP chips.
+
 config SPI_OMAP24XX
 	bool "McSPI driver for OMAP24xx"
 	depends on SPI_MASTER && ARCH_OMAP24XX

drivers/spi/Makefile

@@ -14,6 +14,7 @@ obj-$(CONFIG_SPI_MASTER)		+= spi.o
 obj-$(CONFIG_SPI_BITBANG)		+= spi_bitbang.o
 obj-$(CONFIG_SPI_BUTTERFLY)		+= spi_butterfly.o
 obj-$(CONFIG_SPI_OMAP24XX)		+= omap2_mcspi.o
+obj-$(CONFIG_SPI_OMAP_UWIRE)		+= omap_uwire.o
 # 	... add above this line ...
 
 # SPI protocol drivers (device/link on bus)