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designware_i2c: Enhance DesignWare I2C driver address support

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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>
This commit is contained in:
Chin Liang See 2014-02-04 11:56:23 -06:00 committed by Heiko Schocher
parent 9e50c406c8
commit 070cbaf821
1 changed files with 9 additions and 32 deletions
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41
drivers/i2c/designware_i2c.c
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@ -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);