Merge pull request #47 from cburbridge/i2c

Backport of Chris Boot's i2c and spi drivers.
Thanks bootc and cburbridge.

Author: popcornmix

arch/arm/configs/bcmrpi_cutdown_defconfig

@@ -550,3 +550,12 @@ CONFIG_CRYPTO_DEFLATE=m
 # CONFIG_CRYPTO_HW is not set
 CONFIG_CRC_ITU_T=y
 CONFIG_LIBCRC32C=y
+CONFIG_I2C=y
+CONFIG_I2C_BOARDINFO=y
+CONFIG_I2C_COMPAT=y
+CONFIG_I2C_CHARDEV=m
+CONFIG_I2C_HELPER_AUTO=y
+CONFIG_I2C_BCM2708=m
+CONFIG_SPI=y
+CONFIG_SPI_MASTER=y
+CONFIG_SPI_BCM2708=m

arch/arm/mach-bcm2708/bcm2708.c

@@ -31,6 +31,7 @@
 #include <linux/cnt32_to_63.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/spi/spi.h>
 
 #include <linux/version.h>
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,38)
@@ -195,15 +196,13 @@ static struct clk osc_clk = {
 
 /* warning - the USB needs a clock > 34MHz */
 
-#ifdef CONFIG_MMC_BCM2708
 static struct clk sdhost_clk = {
 #ifdef CONFIG_ARCH_BCM2708_CHIPIT
 	.rate = 4000000,	/* 4MHz */
 #else
 	.rate = 250000000,	/* 250MHz */
 #endif
 };
-#endif
 
 static struct clk_lookup lookups[] = {
 	{			/* UART0 */
@@ -219,6 +218,15 @@ static struct clk_lookup lookups[] = {
 	 .dev_id = "bcm2708_mci.0",
 	 .clk = &sdhost_clk,
 #endif
+	 }, {	/* SPI */
+		 .dev_id = "bcm2708_spi.0",
+		 .clk = &sdhost_clk,
+	 }, {	/* BSC0 */
+		 .dev_id = "bcm2708_i2c.0",
+		 .clk = &sdhost_clk,
+	 }, {	/* BSC1 */
+		 .dev_id = "bcm2708_i2c.1",
+		 .clk = &sdhost_clk,
 	 }
 };
 
@@ -461,6 +469,80 @@ static struct platform_device bcm2708_alsa_devices[] = {
 	       },
 };
 
+static struct resource bcm2708_spi_resources[] = {
+	{
+		.start = SPI0_BASE,
+		.end = SPI0_BASE + SZ_256 - 1,
+		.flags = IORESOURCE_MEM,
+	}, {
+		.start = IRQ_SPI,
+		.end = IRQ_SPI,
+		.flags = IORESOURCE_IRQ,
+	}
+};
+
+static struct platform_device bcm2708_spi_device = {
+	.name = "bcm2708_spi",
+	.id = 0,
+	.num_resources = ARRAY_SIZE(bcm2708_spi_resources),
+	.resource = bcm2708_spi_resources,
+};
+
+static struct spi_board_info bcm2708_spi_devices[] = {
+	{
+		.modalias = "spidev",
+		.max_speed_hz = 500000,
+		.bus_num = 0,
+		.chip_select = 0,
+		.mode = SPI_MODE_0,
+	}, {
+		.modalias = "spidev",
+		.max_speed_hz = 500000,
+		.bus_num = 0,
+		.chip_select = 1,
+		.mode = SPI_MODE_0,
+	}
+};
+
+static struct resource bcm2708_bsc0_resources[] = {
+	{
+		.start = BSC0_BASE,
+		.end = BSC0_BASE + SZ_256 - 1,
+		.flags = IORESOURCE_MEM,
+	}, {
+		.start = INTERRUPT_I2C,
+		.end = INTERRUPT_I2C,
+		.flags = IORESOURCE_IRQ,
+	}
+};
+
+static struct platform_device bcm2708_bsc0_device = {
+	.name = "bcm2708_i2c",
+	.id = 0,
+	.num_resources = ARRAY_SIZE(bcm2708_bsc0_resources),
+	.resource = bcm2708_bsc0_resources,
+};
+
+
+static struct resource bcm2708_bsc1_resources[] = {
+	{
+		.start = BSC1_BASE,
+		.end = BSC1_BASE + SZ_256 - 1,
+		.flags = IORESOURCE_MEM,
+	}, {
+		.start = INTERRUPT_I2C,
+		.end = INTERRUPT_I2C,
+		.flags = IORESOURCE_IRQ,
+	}
+};
+
+static struct platform_device bcm2708_bsc1_device = {
+	.name = "bcm2708_i2c",
+	.id = 1,
+	.num_resources = ARRAY_SIZE(bcm2708_bsc1_resources),
+	.resource = bcm2708_bsc1_resources,
+};
+
 int __init bcm_register_device(struct platform_device *pdev)
 {
 	int ret;
@@ -513,6 +595,10 @@ void __init bcm2708_init(void)
 	for (i = 0; i < ARRAY_SIZE(bcm2708_alsa_devices); i++)
 		bcm_register_device(&bcm2708_alsa_devices[i]);
 
+	bcm_register_device(&bcm2708_spi_device);
+	bcm_register_device(&bcm2708_bsc0_device);
+	bcm_register_device(&bcm2708_bsc1_device);
+
 #ifdef CONFIG_BCM2708_VCMEM
 	{
 		extern void vc_mem_connected_init(void);
@@ -525,6 +611,11 @@ void __init bcm2708_init(void)
 	}
 	system_rev = boardrev;
 	system_serial_low = serial;
+
+#ifdef CONFIG_SPI
+	spi_register_board_info(bcm2708_spi_devices,
+			ARRAY_SIZE(bcm2708_spi_devices));
+#endif
 }
 
 #define TIMER_PERIOD 10000	/* HZ in microsecs */

arch/arm/mach-bcm2708/include/mach/platform.h

@@ -63,9 +63,12 @@
 #define GPIO_BASE                (BCM2708_PERI_BASE + 0x200000) /* GPIO */
 #define UART0_BASE               (BCM2708_PERI_BASE + 0x201000)	/* Uart 0 */
 #define MMCI0_BASE               (BCM2708_PERI_BASE + 0x202000) /* MMC interface */
+#define SPI0_BASE		 (BCM2708_PERI_BASE + 0x204000) /* SPI0 */
+#define BSC0_BASE		 (BCM2708_PERI_BASE + 0x205000) /* BSC0 I2C/TWI */
 #define UART1_BASE               (BCM2708_PERI_BASE + 0x215000) /* Uart 1 */
 #define EMMC_BASE                (BCM2708_PERI_BASE + 0x300000) /* eMMC interface */
 #define SMI_BASE		 (BCM2708_PERI_BASE + 0x600000) /* SMI */
+#define BSC1_BASE		 (BCM2708_PERI_BASE + 0x804000) /* BSC1 I2C/TWI */
 #define USB_BASE                 (BCM2708_PERI_BASE + 0x980000) /* DTC_OTG USB controller */
 #define MCORE_BASE               (BCM2708_PERI_BASE + 0x0000)   /* Fake frame buffer device (actually the multicore sync block*/
 

drivers/i2c/busses/Kconfig

@@ -309,6 +309,14 @@ config I2C_AU1550
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-au1550.
 
+config I2C_BCM2708
+	tristate "BCM2708 BSC"
+	depends on MACH_BCM2708
+	help
+	  Enabling this option will add BSC (Broadcom Serial Controller)
+	  support for the BCM2708. BSC is a Broadcom proprietary bus compatible
+	  with I2C/TWI/SMBus.
+
 config I2C_BLACKFIN_TWI
 	tristate "Blackfin TWI I2C support"
 	depends on BLACKFIN

drivers/i2c/busses/Makefile

@@ -30,6 +30,7 @@ obj-$(CONFIG_I2C_POWERMAC)	+= i2c-powermac.o
 # Embedded system I2C/SMBus host controller drivers
 obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
+obj-$(CONFIG_I2C_BCM2708)	+= i2c-bcm2708.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CPM)		+= i2c-cpm.o
 obj-$(CONFIG_I2C_DAVINCI)	+= i2c-davinci.o