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 --- Changes for v3 - Re-based the patch to latest head Changes for v2 - Removed the function check_params() --- drivers/i2c/designware_i2c.c | 41 +++++++++-------------------------------- 1 file changed, 9 insertions(+), 32 deletions(-)
diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c index 9ed9295..deea4f8 100644 --- 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);