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

5 files changed, 47 insertions, 8 deletions

diff --git a/common/env_eeprom.c b/common/env_eeprom.c
index 0dcdd1fc80..0db2bb63fe 100644
--- a/common/env_eeprom.c
+++ b/common/env_eeprom.c
@@ -24,7 +24,6 @@ DECLARE_GLOBAL_DATA_PTR;
 env_t *env_ptr;
 
 char *env_name_spec = "EEPROM";
-int env_eeprom_bus = -1;
 
 static int eeprom_bus_read(unsigned dev_addr, unsigned offset,
 			   uchar *buffer, unsigned cnt)
@@ -40,8 +39,7 @@ static int eeprom_bus_read(unsigned dev_addr, unsigned offset,
 	rcode = eeprom_read(dev_addr, offset, buffer, cnt);
 
 #if defined(CONFIG_I2C_ENV_EEPROM_BUS)
-	if (old_bus != env_eeprom_bus)
-		i2c_set_bus_num(old_bus);
+	i2c_set_bus_num(old_bus);
 #endif
 
 	return rcode;
@@ -63,6 +61,7 @@ static int eeprom_bus_write(unsigned dev_addr, unsigned offset,
 #if defined(CONFIG_I2C_ENV_EEPROM_BUS)
 	i2c_set_bus_num(old_bus);
 #endif
+
 	return rcode;
 }
 
diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c
index cb2ac04b60..9ed929521a 100644
--- a/drivers/i2c/designware_i2c.c
+++ b/drivers/i2c/designware_i2c.c
@@ -266,6 +266,25 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
 {
 	unsigned long start_time_rx;
 
+#ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW
+	/*
+	 * EEPROM chips that implement "address overflow" are ones
+	 * like Catalyst 24WC04/08/16 which has 9/10/11 bits of
+	 * address and the extra bits end up in the "chip address"
+	 * bit slots. This makes a 24WC08 (1Kbyte) chip look like
+	 * four 256 byte chips.
+	 *
+	 * Note that we consider the length of the address field to
+	 * still be one byte because the extra address bits are
+	 * hidden in the chip address.
+	 */
+	chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
+	addr &= ~(CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW << (alen * 8));
+
+	debug("%s: fix addr_overflow: chip %02x addr %02x\n", __func__, chip,
+	      addr);
+#endif
+
 	if (check_params(addr, alen, buffer, len))
 		return 1;
 
@@ -307,6 +326,25 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
 	int nb = len;
 	unsigned long start_time_tx;
 
+#ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW
+	/*
+	 * EEPROM chips that implement "address overflow" are ones
+	 * like Catalyst 24WC04/08/16 which has 9/10/11 bits of
+	 * address and the extra bits end up in the "chip address"
+	 * bit slots. This makes a 24WC08 (1Kbyte) chip look like
+	 * four 256 byte chips.
+	 *
+	 * Note that we consider the length of the address field to
+	 * still be one byte because the extra address bits are
+	 * hidden in the chip address.
+	 */
+	chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
+	addr &= ~(CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW << (alen * 8));
+
+	debug("%s: fix addr_overflow: chip %02x addr %02x\n", __func__, chip,
+	      addr);
+#endif
+
 	if (check_params(addr, alen, buffer, len))
 		return 1;
 
diff --git a/drivers/i2c/fti2c010.c b/drivers/i2c/fti2c010.c
index fb9fa353d1..68d9a42912 100644
--- a/drivers/i2c/fti2c010.c
+++ b/drivers/i2c/fti2c010.c
@@ -201,7 +201,7 @@ static int fti2c010_read(struct i2c_adapter *adap,
 	struct fti2c010_chip *chip = chip_list + adap->hwadapnr;
 	struct fti2c010_regs *regs = chip->regs;
 	int ret, pos;
-	uchar paddr[4];
+	uchar paddr[4] = { 0 };
 
 	to_i2c_addr(paddr, addr, alen);
 
@@ -263,7 +263,7 @@ static int fti2c010_write(struct i2c_adapter *adap,
 	struct fti2c010_chip *chip = chip_list + adap->hwadapnr;
 	struct fti2c010_regs *regs = chip->regs;
 	int ret, pos;
-	uchar paddr[4];
+	uchar paddr[4] = { 0 };
 
 	to_i2c_addr(paddr, addr, alen);
 
diff --git a/drivers/i2c/i2c_core.c b/drivers/i2c/i2c_core.c
index e1767f4bd4..18d6736601 100644
--- a/drivers/i2c/i2c_core.c
+++ b/drivers/i2c/i2c_core.c
@@ -349,7 +349,7 @@ unsigned int i2c_set_bus_speed(unsigned int speed)
 		return 0;
 	ret = I2C_ADAP->set_bus_speed(I2C_ADAP, speed);
 	if (gd->flags & GD_FLG_RELOC)
-		I2C_ADAP->speed = ret;
+		I2C_ADAP->speed = (ret == 0) ? speed : 0;
 
 	return ret;
 }
diff --git a/drivers/i2c/rcar_i2c.c b/drivers/i2c/rcar_i2c.c
index ba2cadb17e..50cebd622b 100644
--- a/drivers/i2c/rcar_i2c.c
+++ b/drivers/i2c/rcar_i2c.c
@@ -119,11 +119,13 @@ 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);
 
-	while ((readl(&dev->icmsr) & (MSR_MAT | MSR_MDE))
-		!= (MSR_MAT | MSR_MDE))
+	while ((readl(&dev->icmsr) & (MSR_MAT | MSR_MDR))
+		!= (MSR_MAT | MSR_MDR))
 		udelay(10);
 
 	/* clear ESG */