[U-Boot] [PATCH v3 3/4] i2c: fti2c010: serial out r/w address in MSB order

[Kuo-Jung Su]

From: Kuo-Jung Su <dantesu at faraday-tech.com>

For a eeprom with a 2-bytes address (e.g., Ateml AT24C1024B),
the r/w address should be serial out in MSB order.

Signed-off-by: Kuo-Jung Su <dantesu at faraday-tech.com>
Cc: Heiko Schocher <hs at denx.de>
---
 Changes for v3:
  - Coding style update

 Changes for v2:
  - Initial release

 drivers/i2c/fti2c010.c |   26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/drivers/i2c/fti2c010.c b/drivers/i2c/fti2c010.c
index eccc1da..fb9fa35 100644
--- a/drivers/i2c/fti2c010.c
+++ b/drivers/i2c/fti2c010.c
@@ -179,6 +179,22 @@ static int fti2c010_probe(struct i2c_adapter *adap, u8 dev)
 	return ret;
 }

+static void to_i2c_addr(u8 *buf, uint32_t addr, int alen)
+{
+	int i, shift;
+
+	if (!buf || alen <= 0)
+		return;
+
+	/* MSB first */
+	i = 0;
+	shift = (alen - 1) * 8;
+	while (alen-- > 0) {
+		buf[i] = (u8)(addr >> shift);
+		shift -= 8;
+	}
+}
+
 static int fti2c010_read(struct i2c_adapter *adap,
 			u8 dev, uint addr, int alen, uchar *buf, int len)
 {
@@ -187,10 +203,7 @@ static int fti2c010_read(struct i2c_adapter *adap,
 	int ret, pos;
 	uchar paddr[4];

-	paddr[0] = (addr >> 0)  & 0xFF;
-	paddr[1] = (addr >> 8)  & 0xFF;
-	paddr[2] = (addr >> 16) & 0xFF;
-	paddr[3] = (addr >> 24) & 0xFF;
+	to_i2c_addr(paddr, addr, alen);

 	/*
 	 * Phase A. Set register address
@@ -252,10 +265,7 @@ static int fti2c010_write(struct i2c_adapter *adap,
 	int ret, pos;
 	uchar paddr[4];

-	paddr[0] = (addr >> 0)  & 0xFF;
-	paddr[1] = (addr >> 8)  & 0xFF;
-	paddr[2] = (addr >> 16) & 0xFF;
-	paddr[3] = (addr >> 24) & 0xFF;
+	to_i2c_addr(paddr, addr, alen);

 	/*
 	 * Phase A. Set register address
--
1.7.9.5