[U-Boot] [PATCH v2 5/9] drivers:i2c: Add support for multi I2C

[Piotr Wilczek]

This patch enables use of SOFT I2C and HARD I2C simultaneously.

Signed-off-by: Gwuieon Jin <ge.jin at samsung.com>
Signed-off-by: Piotr Wilczek <p.wilczek at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
CC: Minkyu Kang <mk7.kang at samsung.com>
---
Changes in v2:
	- new patch

 drivers/i2c/Makefile    |    1 +
 drivers/i2c/multi_i2c.c |  124 +++++++++++++++++++++++++++++++++++++++++++++++
 include/multi_i2c.h     |   62 +++++++++++++++++++++++
 3 files changed, 187 insertions(+), 0 deletions(-)
 create mode 100644 drivers/i2c/multi_i2c.c
 create mode 100644 include/multi_i2c.h

diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index 5dbdbe3..5c82130 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -46,6 +46,7 @@ COBJS-$(CONFIG_TSI108_I2C) += tsi108_i2c.o
 COBJS-$(CONFIG_U8500_I2C) += u8500_i2c.o
 COBJS-$(CONFIG_SH_I2C) += sh_i2c.o
 COBJS-$(CONFIG_SH_SH7734_I2C) += sh_sh7734_i2c.o
+COBJS-$(CONFIG_MULTI_I2C) += multi_i2c.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
diff --git a/drivers/i2c/multi_i2c.c b/drivers/i2c/multi_i2c.c
new file mode 100644
index 0000000..7751c7b
--- /dev/null
+++ b/drivers/i2c/multi_i2c.c
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd. All rights reserved.
+ * Gwuieon Jin <ge.jin 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 <asm/errno.h>
+#include <multi_i2c.h>
+
+
+static struct multi_i2c_dev multi_i2c_devs[MULTI_I2C_MAX];
+static struct multi_i2c_dev *active_dev;
+static int count_devices;
+
+static struct multi_i2c_dev *multi_i2c_get_by_bus(const unsigned int bus)
+{
+	/* HARD I2C MAX NUM */
+	if (bus > CONFIG_MAX_I2C_NUM)
+		return &multi_i2c_devs[MULTI_I2C_SOFT];
+
+	return &multi_i2c_devs[MULTI_I2C_HARD];
+}
+
+static void multi_i2c_register(struct i2c_ops *ops, u32 flags)
+{
+	int index;
+
+	if (flags & SOFT_I2C_DEV)
+		index = MULTI_I2C_SOFT;
+	else
+		index = MULTI_I2C_HARD;
+
+	multi_i2c_devs[index].ops = ops;
+	active_dev = &multi_i2c_devs[index];
+	count_devices++;
+}
+
+void i2c_init(int speed, int slaveadd)
+{
+	int i;
+
+	count_devices = 0;
+
+#ifdef CONFIG_SOFT_I2C
+	multi_i2c_register(&soft_i2c_ops, SOFT_I2C_DEV);
+#endif
+#ifdef CONFIG_DRIVER_S3C24X0_I2C
+	multi_i2c_register(&s3c24x0_i2c_ops, HARD_I2C_DEV);
+#endif
+	for (i = 0; i < count_devices; i++) {
+		if (multi_i2c_devs[i].ops->init)
+			multi_i2c_devs[i].ops->init(speed, slaveadd);
+	}
+}
+
+int i2c_probe(uchar chip)
+{
+	return active_dev->ops->probe(chip);
+}
+
+int i2c_read(uchar chip, uint addr, int alen,
+		uchar *buffer, int len)
+{
+	return active_dev->ops->read(chip, addr, alen,
+			buffer, len);
+}
+
+int i2c_write(uchar chip, uint addr, int alen,
+		uchar *buffer, int len)
+{
+	return active_dev->ops->write(chip, addr, alen,
+			buffer, len);
+}
+
+unsigned int i2c_get_bus_num(void)
+{
+	return active_dev->ops->get_bus_num();
+}
+
+int i2c_set_bus_num(unsigned int bus)
+{
+	struct multi_i2c_dev *dev;
+
+	if (bus < 0 || bus > CONFIG_SYS_MAX_I2C_BUS)
+		return -1;
+
+	dev = multi_i2c_get_by_bus(bus);
+	if (dev) {
+		active_dev = dev;
+		return dev->ops->set_bus_num(bus);
+	}
+
+	printf("%s: Can not find I2C dev for %d bus\n",
+				__func__, bus);
+	return -EINVAL;
+}
+
+void i2c_reset(void)
+{
+	int i;
+
+	for (i = 0; i < count_devices; i++) {
+		if (multi_i2c_devs[i].ops->reset)
+			multi_i2c_devs[i].ops->reset();
+	}
+}
diff --git a/include/multi_i2c.h b/include/multi_i2c.h
new file mode 100644
index 0000000..795fbf0
--- /dev/null
+++ b/include/multi_i2c.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd. All rights reserved.
+ * Gwuieon Jin <ge.jin 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
+ */
+
+#ifndef _MULTI_I2C_H
+#define _MULTI_I2C_H
+
+#define SOFT_I2C_DEV  (1 << 1)
+#define HARD_I2C_DEV  (1 << 2)
+
+enum {
+	MULTI_I2C_SOFT,
+	MULTI_I2C_HARD,
+	MULTI_I2C_MAX,
+};
+
+struct i2c_ops {
+	void (*init) (int speed, int slaveadd);
+	int (*probe) (uchar chip);
+	int (*read) (uchar chip, uint addr, int alen,
+		uchar *buffer, int len);
+	int (*read_r) (uchar chip, uint addr, int alen,
+		uchar *buffer, int len);
+	int (*write) (uchar chip, uint addr, int alen,
+		uchar *buffer, int len);
+	unsigned int (*get_bus_num) (void);
+	int (*set_bus_num) (unsigned int bus);
+	void (*reset) (void);
+};
+
+/* Device information */
+struct multi_i2c_dev {
+	struct i2c_ops *ops;
+};
+
+#ifdef CONFIG_SOFT_I2C
+extern struct i2c_ops soft_i2c_ops;
+#endif
+#ifdef CONFIG_DRIVER_S3C24X0_I2C
+extern struct i2c_ops s3c24x0_i2c_ops;
+#endif
+
+#endif /* _MULTI_I2C_H */
-- 
1.7.5.4