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i2c:soft:multi: Support for multiple soft I2C buses at Samsung boards 

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>
Acked-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Łukasz Majewski 2012-09-04 23:15:20 +00:00 committed by Heiko Schocher
parent a532278074
commit 7ca8f73a0a
3 changed files with 120 additions and 0 deletions
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43
board/samsung/common/Makefile Normal file
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@ -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
#########################################################################

65
board/samsung/common/multi_i2c.c Normal file
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@ -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;
}

12
include/i2c.h
View File

@ -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_ */