1 files changed, 73 insertions, 0 deletions
diff --git a/roms/u-boot/board/keymile/km83xx/km83xx_i2c.c b/roms/u-boot/board/keymile/km83xx/km83xx_i2c.c
new file mode 100644
index 000000000..62100b194
--- /dev/null
+++ b/roms/u-boot/board/keymile/km83xx/km83xx_i2c.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2011
+ * Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <asm/io.h>
+#include <linux/ctype.h>
+#include <linux/delay.h>
+#include "../common/common.h"
+
+static void i2c_write_start_seq(void)
+{
+	struct fsl_i2c_base *base;
+	base = (struct fsl_i2c_base *)(CONFIG_SYS_IMMR +
+			CONFIG_SYS_I2C_OFFSET);
+	udelay(DELAY_ABORT_SEQ);
+	out_8(&base->cr, (I2C_CR_MEN | I2C_CR_MSTA));
+	udelay(DELAY_ABORT_SEQ);
+	out_8(&base->cr, (I2C_CR_MEN));
+}
+
+int i2c_make_abort(void)
+{
+	struct fsl_i2c_base *base;
+	base = (struct fsl_i2c_base *)(CONFIG_SYS_IMMR +
+			CONFIG_SYS_I2C_OFFSET);
+	uchar   last;
+	int     nbr_read = 0;
+	int     i = 0;
+	int	    ret = 0;
+
+	/* wait after each operation to finsh with a delay */
+	out_8(&base->cr, (I2C_CR_MSTA));
+	udelay(DELAY_ABORT_SEQ);
+	out_8(&base->cr, (I2C_CR_MEN | I2C_CR_MSTA));
+	udelay(DELAY_ABORT_SEQ);
+	in_8(&base->dr);
+	udelay(DELAY_ABORT_SEQ);
+	last = in_8(&base->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(&base->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(&base->cr, (I2C_CR_MEN));
+	udelay(DELAY_ABORT_SEQ);
+	/* clear status reg */
+	out_8(&base->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;
+}