powerpc/83xx: move km 83xx specific i2c code to km83xx_i2c

The common code should be valid for more than one architecture.
Therefore this code was reorganized and moved to the new
file km83xx_i2c.c

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

2 files changed, 89 insertions, 1 deletions

diff --git a/board/keymile/km83xx/Makefile b/board/keymile/km83xx/Makefile
index 72945e2833..472768a666 100644
--- a/board/keymile/km83xx/Makefile
+++ b/board/keymile/km83xx/Makefile
@@ -28,7 +28,7 @@ endif
 
 LIB	= $(obj)lib$(BOARD).o
 
-COBJS	+= $(BOARD).o ../common/common.o ../common/ivm.o
+COBJS	+= $(BOARD).o ../common/common.o ../common/ivm.o $(BOARD)_i2c.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
diff --git a/board/keymile/km83xx/km83xx_i2c.c b/board/keymile/km83xx/km83xx_i2c.c
new file mode 100644
index 0000000000..be177753c5
--- /dev/null
+++ b/board/keymile/km83xx/km83xx_i2c.c
@@ -0,0 +1,88 @@
+/*
+ * (C) Copyright 2011
+ * Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.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>
+#include <asm/io.h>
+#include <linux/ctype.h>
+#include "../common/common.h"
+
+static void i2c_write_start_seq(void)
+{
+	struct fsl_i2c *dev;
+	dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET);
+	udelay(DELAY_ABORT_SEQ);
+	out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA));
+	udelay(DELAY_ABORT_SEQ);
+	out_8(&dev->cr, (I2C_CR_MEN));
+}
+
+int i2c_make_abort(void)
+{
+	struct fsl_i2c *dev;
+	dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET);
+	uchar	dummy;
+	uchar   last;
+	int     nbr_read = 0;
+	int     i = 0;
+	int	    ret = 0;
+
+	/* wait after each operation to finsh with a delay */
+	out_8(&dev->cr, (I2C_CR_MSTA));
+	udelay(DELAY_ABORT_SEQ);
+	out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA));
+	udelay(DELAY_ABORT_SEQ);
+	dummy = in_8(&dev->dr);
+	udelay(DELAY_ABORT_SEQ);
+	last = in_8(&dev->dr);
+	nbr_read++;
+
+	/*
+	 * do read until the last bit is 1, but stop if the full eeprom is
+	 * read.
+	 */
+	while (((last & 0x01) != 0x01) &&
+		(nbr_read < CONFIG_SYS_IVM_EEPROM_MAX_LEN)) {
+		udelay(DELAY_ABORT_SEQ);
+		last = in_8(&dev->dr);
+		nbr_read++;
+	}
+	if ((last & 0x01) != 0x01)
+		ret = -2;
+	if ((last != 0xff) || (nbr_read > 1))
+		printf("[INFO] i2c abort after %d bytes (0x%02x)\n",
+			nbr_read, last);
+	udelay(DELAY_ABORT_SEQ);
+	out_8(&dev->cr, (I2C_CR_MEN));
+	udelay(DELAY_ABORT_SEQ);
+	/* clear status reg */
+	out_8(&dev->sr, 0);
+
+	for (i = 0; i < 5; i++)
+		i2c_write_start_seq();
+	if (ret != 0)
+		printf("[ERROR] i2c abort failed after %d bytes (0x%02x)\n",
+			nbr_read, last);
+
+	return ret;
+}