i2c: Add support for designware i2c controller

Earlier, a driver exists in the u-boot source for designware i2c interface. That
driver was specific to spear platforms. This patch implements the i2c controller
as a generic driver which can be used by multiple platforms

The driver files are now renamed to designware_i2c.c and designware_i2c.h and
these are moved into drivers/i2c folder for reusability by other
platforms

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Amit Virdi <amit.virdi@st.com>

drivers/i2c/Makefile

@@ -27,6 +27,7 @@ LIB	:= $(obj)libi2c.o
 
 COBJS-$(CONFIG_BFIN_TWI_I2C) += bfin-twi_i2c.o
 COBJS-$(CONFIG_DRIVER_DAVINCI_I2C) += davinci_i2c.o
+COBJS-$(CONFIG_DW_I2C) += designware_i2c.o
 COBJS-$(CONFIG_FSL_I2C) += fsl_i2c.o
 COBJS-$(CONFIG_I2C_MVTWSI) += mvtwsi.o
 COBJS-$(CONFIG_I2C_MV) += mv_i2c.o
@@ -40,7 +41,6 @@ COBJS-$(CONFIG_PPC4XX_I2C) += ppc4xx_i2c.o
 COBJS-$(CONFIG_DRIVER_S3C24X0_I2C) += s3c24x0_i2c.o
 COBJS-$(CONFIG_S3C44B0_I2C) += s3c44b0_i2c.o
 COBJS-$(CONFIG_SOFT_I2C) += soft_i2c.o
-COBJS-$(CONFIG_SPEAR_I2C) += spr_i2c.o
 COBJS-$(CONFIG_TEGRA_I2C) += tegra_i2c.o
 COBJS-$(CONFIG_TSI108_I2C) += tsi108_i2c.o
 COBJS-$(CONFIG_U8500_I2C) += u8500_i2c.o

drivers/i2c/designware_i2c.c

@@ -24,7 +24,7 @@
 #include <common.h>
 #include <asm/io.h>
 #include <asm/arch/hardware.h>
-#include <asm/arch/spr_i2c.h>
+#include "designware_i2c.h"
 
 static struct i2c_regs *const i2c_regs_p =
     (struct i2c_regs *)CONFIG_SYS_I2C_BASE;
@@ -113,7 +113,7 @@ int i2c_get_bus_speed(void)
 /*
  * i2c_init - Init function
  * @speed:	required i2c speed
- * @slaveadd:	slave address for the spear device
+ * @slaveadd:	slave address for the device
  *
  * Initialization function.
  */

drivers/i2c/designware_i2c.h

@@ -21,8 +21,8 @@
  * MA 02111-1307 USA
  */
 
-#ifndef __SPR_I2C_H_
-#define __SPR_I2C_H_
+#ifndef __DW_I2C_H_
+#define __DW_I2C_H_
 
 struct i2c_regs {
 	u32 ic_con;
@@ -143,4 +143,4 @@ struct i2c_regs {
 #define I2C_FAST_SPEED		400000
 #define I2C_STANDARD_SPEED	100000
 
-#endif /* __SPR_I2C_H_ */
+#endif /* __DW_I2C_H_ */

include/configs/spear-common.h

@@ -41,7 +41,7 @@
 
 /* I2C driver configuration */
 #define CONFIG_HARD_I2C
-#define CONFIG_SPEAR_I2C
+#define CONFIG_DW_I2C
 #define CONFIG_SYS_I2C_SPEED			400000
 #define CONFIG_SYS_I2C_SLAVE			0x02