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authorChin Liang See <clsee@altera.com>2014-02-04 11:56:23 -0600
committerHeiko Schocher <hs@denx.de>2014-02-20 06:46:56 +0100
commit070cbaf821e07531db6e55946932f4172dd72045 (patch)
tree334a56e307b9b29f47e9d4a856933bfd516fc991 /drivers/i2c
parent9e50c406c8eede1105bd8ad1c1b74e0ef64af233 (diff)
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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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/designware_i2c.c41
1 files 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);