[U-Boot] [PATCH] designware_i2c: Enhance DesignWare I2C driver address support

[Chin Liang See]

Enhance the DesignWare I2C driver to support address length more
than 1 byte. This enhancement is required as some I2C slave
device such as EEPROM chip might have 16 bit address byte.

Signed-off-by: Chin Liang See <clsee at altera.com>
Cc: Alexey Brodkin <Alexey.Brodkin at synopsys.com>
Cc: Tom Rini <trini at ti.com>
cc: Armando Visconti <armando.visconti at st.com>
Cc: Stefan Roese <sr at denx.de>
Cc: Albert ARIBAUD <albert.u.boot at aribaud.net>
Cc: Heiko Schocher <hs at denx.de>
Cc: Vipin KUMAR <vipin.kumar at st.com>
Cc: Tom Rix <Tom.Rix at windriver.com>
Cc: Mischa Jonker <mjonker at synopsys.com>
---
 drivers/i2c/designware_i2c.c |   24 +++++++++---------------
 1 file changed, 9 insertions(+), 15 deletions(-)

diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c
index cb2ac04..c0ac5f7 100644
--- a/drivers/i2c/designware_i2c.c
+++ b/drivers/i2c/designware_i2c.c
@@ -205,27 +205,21 @@ static int check_params(uint addr, int alen, uchar *buffer, int len)
 		return 1;
 	}
 
-	if (alen > 1) {
-		printf("addr len %d not supported\n", alen);
-		return 1;
-	}
-
-	if (addr + len > 256) {
-		printf("address out of range\n");
-		return 1;
-	}
-
 	return 0;
 }
 
-static int i2c_xfer_init(uchar chip, uint addr)
+static int i2c_xfer_init(uchar chip, uint addr, int alen)
 {
 	if (i2c_wait_for_bb())
 		return 1;
 
 	i2c_setaddress(chip);
-	writel(addr, &i2c_regs_p->ic_cmd_data);
-
+	while (alen) {
+		alen--;
+		/* high byte address going out first */
+		writel((addr >> (alen * 8)) & 0xff,
+			&i2c_regs_p->ic_cmd_data);
+	}
 	return 0;
 }
 
@@ -269,7 +263,7 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
 	if (check_params(addr, alen, buffer, len))
 		return 1;
 
-	if (i2c_xfer_init(chip, addr))
+	if (i2c_xfer_init(chip, addr, alen))
 		return 1;
 
 	start_time_rx = get_timer(0);
@@ -310,7 +304,7 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
 	if (check_params(addr, alen, buffer, len))
 		return 1;
 
-	if (i2c_xfer_init(chip, addr))
+	if (i2c_xfer_init(chip, addr, alen))
 		return 1;
 
 	start_time_tx = get_timer(0);
-- 
1.7.9.5