[U-Boot] [PATCH v4 1/2] i2c:soft:multi: Support for multiple soft I2C buses at Samsung boards

[Lukasz Majewski]

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 at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
Cc: Heiko Schocher <hs at denx.de>
Cc: Minkyu Kang <mk7.kang at 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 at 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 at 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_ */
-- 
1.7.2.3