Support for multiple soft I2C buses.
Multibus I2C support is achieved by defining get_multi_{sda|scl}_pin functions to switch between multiple "soft" I2C buses.
Common definition of I2C_X I2C buses is provided at <i2c.h>.
TEST HW: Samsung's Exynos4210 evt.0.1 - Trats development board
Signed-off-by: Lukasz Majewski l.majewski@samsung.com Signed-off-by: Kyungmin Park kyungmin.park@samsung.com Cc: Heiko Schocher hs@denx.de Cc: Minkyu Kang mk7.kang@samsung.com
--- Changes for v2: - Common Samsung code has been put to board/samsung/common/multi_i2c.c file - I2C_{4|5} have been renamed to I2C_{0|1} - *soft_i2c_name[] table has been removed Changes for v3: - None Changes for v4: - Common definitions of available I2C buses are now defined at <i2c.h> - Compatibility layer (I2C_0) has been added temporarily to not break the Trats I2C communication with PMIC. It will be removed when redesigned PMIC will be posted --- board/samsung/common/Makefile | 43 +++++++++++++++++++++++++ board/samsung/common/multi_i2c.c | 65 ++++++++++++++++++++++++++++++++++++++ include/i2c.h | 12 +++++++ 3 files changed, 120 insertions(+), 0 deletions(-) create mode 100644 board/samsung/common/Makefile create mode 100644 board/samsung/common/multi_i2c.c
diff --git a/board/samsung/common/Makefile b/board/samsung/common/Makefile new file mode 100644 index 0000000..0bcd594 --- /dev/null +++ b/board/samsung/common/Makefile @@ -0,0 +1,43 @@ +# +# Copyright (C) 2012 Samsung Electronics +# Lukasz Majewski l.majewski@samsung.com +# +# See file CREDITS for list of people who contributed to this +# project. +# +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License as +# published by the Free Software Foundation; either version 2 of +# the License, or (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, +# MA 02111-1307 USA +# + +include $(TOPDIR)/config.mk + +LIB = $(obj)libsamsung.o + +COBJS-$(CONFIG_SOFT_I2C_MULTI_BUS) += multi_i2c.o + +SRCS := $(COBJS-y:.o=.c) +OBJS := $(addprefix $(obj),$(COBJS-y)) + +$(LIB): $(obj).depend $(OBJS) + $(call cmd_link_o_target, $(OBJS)) + +######################################################################### + +# defines $(obj).depend target +include $(SRCTREE)/rules.mk + +sinclude $(obj).depend + +######################################################################### diff --git a/board/samsung/common/multi_i2c.c b/board/samsung/common/multi_i2c.c new file mode 100644 index 0000000..d6c3d37 --- /dev/null +++ b/board/samsung/common/multi_i2c.c @@ -0,0 +1,65 @@ +/* + * Copyright (C) 2012 Samsung Electronics + * Lukasz Majewski l.majewski@samsung.com + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <i2c.h> + +/* Handle multiple I2C buses instances */ +int get_multi_scl_pin(void) +{ + unsigned int bus = I2C_GET_BUS(); + + switch (bus) { + case I2C_0: /* I2C_0 definition - compatibility layer */ + case I2C_5: + return CONFIG_SOFT_I2C_I2C5_SCL; + case I2C_9: + return CONFIG_SOFT_I2C_I2C9_SCL; + default: + printf("I2C_%d not supported!\n", bus); + }; + + return 0; +} + +int get_multi_sda_pin(void) +{ + unsigned int bus = I2C_GET_BUS(); + + switch (bus) { + case I2C_0: /* I2C_0 definition - compatibility layer */ + case I2C_5: + return CONFIG_SOFT_I2C_I2C5_SDA; + case I2C_9: + return CONFIG_SOFT_I2C_I2C9_SDA; + default: + printf("I2C_%d not supported!\n", bus); + }; + + return 0; +} + +int multi_i2c_init(void) +{ + return 0; +} diff --git a/include/i2c.h b/include/i2c.h index 1f35acf..16f099d 100644 --- a/include/i2c.h +++ b/include/i2c.h @@ -250,4 +250,16 @@ static inline void I2C_SET_BUS(unsigned int bus) i2c_set_bus_num(bus); }
+/* Multi I2C definitions */ +enum { + I2C_0, I2C_1, I2C_2, I2C_3, I2C_4, I2C_5, I2C_6, I2C_7, + I2C_8, I2C_9, I2C_10, +}; + +/* Multi I2C busses handling */ +#ifdef CONFIG_SOFT_I2C_MULTI_BUS +extern int get_multi_scl_pin(void); +extern int get_multi_sda_pin(void); +extern int multi_i2c_init(void); +#endif #endif /* _I2C_H_ */