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i2c-eg20t: Fix 10bit access issue

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Reported-by: Jeffrey (Sheng-Hui) Chu <jeffchu@broadcom.com>
Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.lapis-semi.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Tomoya MORINAGA 2011-10-12 13:13:02 +09:00 committed by Ben Dooks
parent c7b41f3aff
commit c249ac207f
1 changed files with 63 additions and 2 deletions
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65
drivers/i2c/busses/i2c-eg20t.c
View file

@ -64,6 +64,7 @@
#define TEN_BIT_ADDR_DEFAULT 0xF000
#define TEN_BIT_ADDR_MASK 0xF0
#define PCH_START 0x0020
#define PCH_RESTART 0x0004
#define PCH_ESR_START 0x0001
#define PCH_BUFF_START 0x1
#define PCH_REPSTART 0x0004
@ -408,7 +409,7 @@ static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap,
}
if (msgs->flags & I2C_M_TEN) {
addr_2_msb = ((addr & I2C_MSB_2B_MSK) >> 7);
addr_2_msb = ((addr & I2C_MSB_2B_MSK) >> 7) & 0x06;
iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR);
if (first)
pch_i2c_start(adap);
@ -479,6 +480,19 @@ static void pch_i2c_sendnack(struct i2c_algo_pch_data *adap)
pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_ACK);
}
/**
* pch_i2c_restart() - Generate I2C restart condition in normal mode.
* @adap: Pointer to struct i2c_algo_pch_data.
*
* Generate I2C restart condition in normal mode by setting I2CCTL.I2CRSTA.
*/
static void pch_i2c_restart(struct i2c_algo_pch_data *adap)
{
void __iomem *p = adap->pch_base_address;
pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL));
pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_RESTART);
}
/**
* pch_i2c_readbytes() - read data from I2C bus in normal mode.
* @i2c_adap: Pointer to the struct i2c_adapter.
@ -496,6 +510,7 @@ static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
u32 length;
u32 addr;
u32 addr_2_msb;
u32 addr_8_lsb;
void __iomem *p = adap->pch_base_address;
length = msgs->len;
@ -511,9 +526,55 @@ static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
}
if (msgs->flags & I2C_M_TEN) {
addr_2_msb = (((addr & I2C_MSB_2B_MSK) >> 7) | (I2C_RD));
addr_2_msb = ((addr & I2C_MSB_2B_MSK) >> 7);
iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR);
if (first)
pch_i2c_start(adap);
rtn = pch_i2c_wait_for_xfer_complete(adap);
if (rtn == 0) {
if (pch_i2c_getack(adap)) {
pch_dbg(adap, "Receive NACK for slave address"
"setting\n");
return -EIO;
}
addr_8_lsb = (addr & I2C_ADDR_MSK);
iowrite32(addr_8_lsb, p + PCH_I2CDR);
} else if (rtn == -EIO) { /* Arbitration Lost */
pch_err(adap, "Lost Arbitration\n");
pch_clrbit(adap->pch_base_address, PCH_I2CSR,
I2CMAL_BIT);
pch_clrbit(adap->pch_base_address, PCH_I2CSR,
I2CMIF_BIT);
pch_i2c_init(adap);
return -EAGAIN;
} else { /* wait-event timeout */
pch_i2c_stop(adap);
return -ETIME;
}
pch_i2c_restart(adap);
rtn = pch_i2c_wait_for_xfer_complete(adap);
if (rtn == 0) {
if (pch_i2c_getack(adap)) {
pch_dbg(adap, "Receive NACK for slave address"
"setting\n");
return -EIO;
}
addr_2_msb |= I2C_RD;
iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK,
p + PCH_I2CDR);
} else if (rtn == -EIO) { /* Arbitration Lost */
pch_err(adap, "Lost Arbitration\n");
pch_clrbit(adap->pch_base_address, PCH_I2CSR,
I2CMAL_BIT);
pch_clrbit(adap->pch_base_address, PCH_I2CSR,
I2CMIF_BIT);
pch_i2c_init(adap);
return -EAGAIN;
} else { /* wait-event timeout */
pch_i2c_stop(adap);
return -ETIME;
}
} else {
/* 7 address bits + R/W bit */
addr = (((addr) << 1) | (I2C_RD));