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authorSteve Sakoman <steve@sakoman.com>2010-07-19 20:31:55 -0700
committerSandeep Paulraj <s-paulraj@ti.com>2010-08-05 10:11:24 -0400
commitd708395d2f83295fba9d9b18823ce17046793590 (patch)
tree55341b83e3c4ed864af43932aa03d6df3308000c
parent674e0b217f794800048d80de09a71255b890a53e (diff)
downloadu-boot-linaro-stable-d708395d2f83295fba9d9b18823ce17046793590.tar.gz
ARMV7: Modify i2c driver for more reliable operation on OMAP4
This patch modifies the init routine to follow the TRM recommendations. It also modifies the i2c_read_byte function to reflect subtle differences between the i2c controller in OMAP3 and OMAP4. Signed-off-by: Steve Sakoman <steve@sakoman.com> Acked-by: Nishanth Menon <menon.nishanth@gmail.com> Acked-by: Heiko Schocher <hs@denx.de> Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
-rw-r--r--arch/arm/include/asm/arch-omap3/i2c.h4
-rw-r--r--drivers/i2c/omap24xx_i2c.c31
-rw-r--r--drivers/i2c/omap24xx_i2c.h4
3 files changed, 28 insertions, 11 deletions
diff --git a/arch/arm/include/asm/arch-omap3/i2c.h b/arch/arm/include/asm/arch-omap3/i2c.h
index 7a4a73aa9..d2e7488fd 100644
--- a/arch/arm/include/asm/arch-omap3/i2c.h
+++ b/arch/arm/include/asm/arch-omap3/i2c.h
@@ -34,7 +34,9 @@ struct i2c {
unsigned short stat; /* 0x08 */
unsigned short res3;
unsigned short iv; /* 0x0C */
- unsigned short res4[3];
+ unsigned short res4;
+ unsigned short syss; /* 0x10 */
+ unsigned short res4a;
unsigned short buf; /* 0x14 */
unsigned short res5;
unsigned short cnt; /* 0x18 */
diff --git a/drivers/i2c/omap24xx_i2c.c b/drivers/i2c/omap24xx_i2c.c
index 3256133dc..7c98f150d 100644
--- a/drivers/i2c/omap24xx_i2c.c
+++ b/drivers/i2c/omap24xx_i2c.c
@@ -27,6 +27,8 @@
#include "omap24xx_i2c.h"
+#define I2C_TIMEOUT 10
+
static void wait_for_bb (void);
static u16 wait_for_pin (void);
static void flush_fifo(void);
@@ -41,6 +43,7 @@ void i2c_init (int speed, int slaveadd)
int psc, fsscll, fssclh;
int hsscll = 0, hssclh = 0;
u32 scll, sclh;
+ int timeout = I2C_TIMEOUT;
/* Only handle standard, fast and high speeds */
if ((speed != OMAP_I2C_STANDARD) &&
@@ -102,15 +105,24 @@ void i2c_init (int speed, int slaveadd)
sclh = (unsigned int)fssclh;
}
- writew(0x2, &i2c_base->sysc); /* for ES2 after soft reset */
- udelay(1000);
- writew(0x0, &i2c_base->sysc); /* will probably self clear but */
-
if (readw (&i2c_base->con) & I2C_CON_EN) {
writew (0, &i2c_base->con);
udelay (50000);
}
+ writew(0x2, &i2c_base->sysc); /* for ES2 after soft reset */
+ udelay(1000);
+
+ writew(I2C_CON_EN, &i2c_base->con);
+ while (!(readw(&i2c_base->syss) & I2C_SYSS_RDONE) && timeout--) {
+ if (timeout <= 0) {
+ printf("ERROR: Timeout in soft-reset\n");
+ return;
+ }
+ udelay(1000);
+ }
+
+ writew(0, &i2c_base->con);
writew(psc, &i2c_base->psc);
writew(scll, &i2c_base->scll);
writew(sclh, &i2c_base->sclh);
@@ -159,15 +171,14 @@ static int i2c_read_byte (u8 devaddr, u8 regoffset, u8 * value)
}
if (!i2c_error) {
- /* free bus, otherwise we can't use a combined transction */
- writew (0, &i2c_base->con);
- while (readw (&i2c_base->stat) || (readw (&i2c_base->con) & I2C_CON_MST)) {
+ writew (I2C_CON_EN, &i2c_base->con);
+ while (readw(&i2c_base->stat) &
+ (I2C_STAT_XRDY | I2C_STAT_ARDY)) {
udelay (10000);
/* Have to clear pending interrupt to clear I2C_STAT */
writew (0xFFFF, &i2c_base->stat);
}
- wait_for_bb ();
/* set slave address */
writew (devaddr, &i2c_base->sa);
/* read one byte from slave */
@@ -191,8 +202,8 @@ static int i2c_read_byte (u8 devaddr, u8 regoffset, u8 * value)
if (!i2c_error) {
writew (I2C_CON_EN, &i2c_base->con);
- while (readw (&i2c_base->stat)
- || (readw (&i2c_base->con) & I2C_CON_MST)) {
+ while (readw (&i2c_base->stat) &
+ (I2C_STAT_RRDY | I2C_STAT_ARDY)) {
udelay (10000);
writew (0xFFFF, &i2c_base->stat);
}
diff --git a/drivers/i2c/omap24xx_i2c.h b/drivers/i2c/omap24xx_i2c.h
index 92a3416e0..650e33a88 100644
--- a/drivers/i2c/omap24xx_i2c.h
+++ b/drivers/i2c/omap24xx_i2c.h
@@ -85,6 +85,10 @@
#define I2C_SYSTEST_SDA_I (1 << 1) /* SDA line sense input value */
#define I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive output value */
+/* I2C System Status Register (I2C_SYSS): */
+
+#define I2C_SYSS_RDONE (1 << 0) /* Internel reset monitoring */
+
#define I2C_SCLL_SCLL 0
#define I2C_SCLL_SCLL_M 0xFF
#define I2C_SCLL_HSSCLL 8