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Merge branch 'master' of git://git.denx.de/u-boot-i2c

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This commit is contained in:
Tom Rini 2014-11-10 09:20:52 -05:00
commit 1e4b45c8f7
4 changed files with 31 additions and 7 deletions
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2
arch/powerpc/include/asm/ppc4xx-i2c.h
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@ -72,6 +72,8 @@ struct ppc4xx_i2c {
#define IIC_EXTSTS_XFRA 0x01
#define IIC_EXTSTS_ICT 0x02
#define IIC_EXTSTS_LA 0x04
#define IIC_EXTSTS_BCS_MASK 0x70
#define IIC_EXTSTS_BCS_FREE 0x40
/* XTCNTLSS Register Bit definition */
#define IIC_XTCNTLSS_SRST 0x01

2
drivers/i2c/fsl_i2c.c
View File

@ -38,7 +38,7 @@
* generic value.
*/
#ifndef CONFIG_I2C_TIMEOUT
#define CONFIG_I2C_TIMEOUT 10000
#define CONFIG_I2C_TIMEOUT 100000
#endif
#define I2C_READ_BIT 1

30
drivers/i2c/ppc4xx_i2c.c
View File

@ -158,8 +158,7 @@ static void ppc4xx_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
*
* Typical case is a Write of an addr followd by a Read. The
* IBM FAQ does not cover this. On the last byte of the write
* we don't set the creg CHT bit, and on the first bytes of the
* read we set the RPST bit.
* we don't set the creg CHT bit but the RPST bit.
*
* It does not support address only transfers, there must be
* a data part. If you want to write the address yourself, put
@ -247,6 +246,10 @@ static int _i2c_transfer(struct i2c_adapter *adap,
if ((!cmd_type && (ptr == addr)) || ((tran + bc) != cnt))
creg |= IIC_CNTL_CHT;
/* last part of address, prepare for repeated start on read */
if (cmd_type && (ptr == addr) && ((tran + bc) == cnt))
creg |= IIC_CNTL_RPST;
if (reading) {
creg |= IIC_CNTL_READ;
} else {
@ -286,6 +289,27 @@ static int _i2c_transfer(struct i2c_adapter *adap,
/* Transfer aborted? */
if (status & IIC_EXTSTS_XFRA)
result = IIC_NOK_XFRA;
/* Is bus free?
* If error happened during combined xfer
* IIC interface is usually stuck in some strange
* state without a valid stop condition.
* Brute, but working: generate stop, then soft reset.
*/
if ((status & IIC_EXTSTS_BCS_MASK)
!= IIC_EXTSTS_BCS_FREE){
u8 mdcntl = in_8(&i2c->mdcntl);
/* Generate valid stop condition */
out_8(&i2c->xtcntlss, IIC_XTCNTLSS_SRST);
out_8(&i2c->directcntl, IIC_DIRCNTL_SCC);
udelay(10);
out_8(&i2c->directcntl,
IIC_DIRCNTL_SCC | IIC_DIRCNTL_SDAC);
out_8(&i2c->xtcntlss, 0);
ppc4xx_i2c_init(adap, (mdcntl & IIC_MDCNTL_FSM)
? 400000 : 100000, 0);
}
} else if ( status & IIC_STS_PT) {
result = IIC_NOK_TOUT;
}
@ -314,8 +338,6 @@ static int _i2c_transfer(struct i2c_adapter *adap,
cnt = data_len;
tran = 0;
reading = cmd_type;
if (reading)
creg = IIC_CNTL_RPST;
}
}
return result;

4
drivers/i2c/rcar_i2c.c
View File

@ -119,10 +119,10 @@ rcar_i2c_raw_read(struct rcar_i2c *dev, u8 chip, uint addr)
/* set slave address, receive */
writel((chip << 1) | 1, &dev->icmar);
/* clear status */
writel(0, &dev->icmsr);
/* start master receive */
writel(MCR_MDBS | MCR_MIE | MCR_ESG, &dev->icmcr);
/* clear status */
writel(0, &dev->icmsr);
while ((readl(&dev->icmsr) & (MSR_MAT | MSR_MDR))
!= (MSR_MAT | MSR_MDR))