designware_i2c: Enhance DesignWare I2C driver address support

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@altera.com>
Acked-by: Alexey Brodkin <Alexey.Brodkin@synopsys.com>
Cc: Tom Rini <trini@ti.com>
cc: Armando Visconti <armando.visconti@st.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Cc: Heiko Schocher <hs@denx.de>

diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c
index 9ed929521a8944dc870fc2eff546507632b6e86a..deea4f83cafabc8a2bdd39f9f66e59c14b461a68 100644 (file)
--- a/drivers/i2c/designware_i2c.c
+++ b/drivers/i2c/designware_i2c.c
@@ -197,35 +197,18 @@ static int i2c_wait_for_bb(void)
        return 0;
 }
 
-/* check parameters for i2c_read and i2c_write */
-static int check_params(uint addr, int alen, uchar *buffer, int len)
-{
-       if (buffer == NULL) {
-               printf("Buffer is invalid\n");
-               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;
 }
 
@@ -285,10 +268,7 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
              addr);
 #endif
 
-       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);
@@ -345,10 +325,7 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
              addr);
 #endif
 
-       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);