[PATCH 3/3] qi-6410-i2c-bitbang.patch

[Andy Green]

Signed-off-by: Andy Green <andy at openmoko.com>
---

 include/i2c-bitbang-s3c6410.h         |    3 +
 src/cpu/s3c2442/i2c-bitbang-s3c24xx.c |    2 -
 src/cpu/s3c6410/i2c-bitbang-s3c6410.c |   69 +++++++++++++++++++++++++++++++++
 3 files changed, 73 insertions(+), 1 deletions(-)
 create mode 100644 include/i2c-bitbang-s3c6410.h
 create mode 100644 src/cpu/s3c6410/i2c-bitbang-s3c6410.c

diff --git a/include/i2c-bitbang-s3c6410.h b/include/i2c-bitbang-s3c6410.h
new file mode 100644
index 0000000..b1c3ed5
--- /dev/null
+++ b/include/i2c-bitbang-s3c6410.h
@@ -0,0 +1,3 @@
+#include <i2c-bitbang.h>
+
+extern struct i2c_bitbang bb_s3c6410;
diff --git a/src/cpu/s3c2442/i2c-bitbang-s3c24xx.c b/src/cpu/s3c2442/i2c-bitbang-s3c24xx.c
index c2d46ed..e68b9b9 100644
--- a/src/cpu/s3c2442/i2c-bitbang-s3c24xx.c
+++ b/src/cpu/s3c2442/i2c-bitbang-s3c24xx.c
@@ -2,7 +2,7 @@
  * (C) Copyright 2007 OpenMoko, Inc.
  * Author: Andy Green <andy at openmoko.com>
  *
- * s3c24xx-specific i2c shared by, eg, GTA02 and GTA03
+ * s3c24xx-specific i2c used by, eg, GTA02
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
diff --git a/src/cpu/s3c6410/i2c-bitbang-s3c6410.c b/src/cpu/s3c6410/i2c-bitbang-s3c6410.c
new file mode 100644
index 0000000..0d1236d
--- /dev/null
+++ b/src/cpu/s3c6410/i2c-bitbang-s3c6410.c
@@ -0,0 +1,69 @@
+/*
+ * (C) Copyright 2007 OpenMoko, Inc.
+ * Author: Andy Green <andy at openmoko.com>
+ *
+ * s3c6410-specific i2c
+ *
+ * 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 <qi.h>
+#include <i2c-bitbang.h>
+#include <s3c6410.h>
+
+static char i2c_read_sda_s3c6410(void)
+{
+	return !!(__REG(GPBDAT) & (1 << 6));
+}
+
+static void i2c_set_s3c6410(char clock, char data)
+{
+	if (clock) /* SCL <- input */
+		__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (5 * 4)));
+	else { /* SCL <- output 0 */
+		__REG(GPBDAT) = (__REG(GPBDAT) & ~(1 << 5));
+		__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (5 * 4))) | (1 << (5 * 4));
+	}
+	if (data) /* SDA <- input */
+		__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (6 * 4)));
+	else { /* SDA <- output 0 */
+		__REG(GPBDAT) = (__REG(GPBDAT) & ~(1 << 6));
+		__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (6 * 4))) | (1 << (6 * 4));
+	}
+}
+
+static void i2c_close_s3c6410(void)
+{
+	/* set back to hardware I2C ready for Linux */
+	__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (5 * 4))) | (2 << (5 * 4));
+	__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (6 * 4))) | (2 << (6 * 4));
+}
+
+static void i2c_spin_s3c6410(void)
+{
+	int n;
+
+	for (n = 0; n < 1000; n++)
+		__REG(GPBDAT) = __REG(GPBDAT);
+}
+
+struct i2c_bitbang bb_s3c6410 = {
+	.read_sda = i2c_read_sda_s3c6410,
+	.set = i2c_set_s3c6410,
+	.spin = i2c_spin_s3c6410,
+	.close = i2c_close_s3c6410,
+};