Lee Leahy has uploaded this change for review.
soc/intel/quark: Add I2C debugging
Add I2C debugging support:
* Add I2C_DEBUG Kconfig value to enable debugging
* Display I2C segments before the transfer
* Display errors that occur during the transfer
* Display the number of bytes transferred for successful transfers
TEST=Build and run on Galileo Gen2
Change-Id: Ia17be8b4213b13fd6c6a367d081414d0f21fbb0f
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
---
M src/soc/intel/quark/Kconfig
M src/soc/intel/quark/i2c.c
2 files changed, 83 insertions(+), 7 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/22/20422/1
diff --git a/src/soc/intel/quark/Kconfig b/src/soc/intel/quark/Kconfig
index bbb1927..d1950a3 100644
--- a/src/soc/intel/quark/Kconfig
+++ b/src/soc/intel/quark/Kconfig
@@ -316,4 +316,14 @@
default n
depends on STORAGE_TEST
+#####
+# I2C debug support
+#####
+
+config I2C_DEBUG
+ bool "Enable I2C debugging"
+ default n
+ help
+ Display the I2C segments and controller errors
+
endif # SOC_INTEL_QUARK
diff --git a/src/soc/intel/quark/i2c.c b/src/soc/intel/quark/i2c.c
index 3988bbe..bc4451b 100644
--- a/src/soc/intel/quark/i2c.c
+++ b/src/soc/intel/quark/i2c.c
@@ -68,12 +68,21 @@
if (status & (IC_INTR_RX_OVER | IC_INTR_RX_UNDER
| IC_INTR_TX_ABRT | IC_INTR_TX_OVER)) {
i2c_disable(regs);
+ if (IS_ENABLED(CONFIG_I2C_DEBUG))
+ printk(BIOS_ERR,
+ "0x%08x: ic_raw_intr_stat, I2C write error!\n",
+ status);
return -1;
}
/* Check for timeout */
- if (stopwatch_expired(timeout))
+ if (stopwatch_expired(timeout)) {
+ if (IS_ENABLED(CONFIG_I2C_DEBUG))
+ printk(BIOS_ERR,
+ "0x%08x: ic_raw_intr_stat, I2C write timeout!\n",
+ status);
return -1;
+ }
/* Receive any available data */
status = regs->ic_status;
@@ -134,12 +143,21 @@
if (status & (IC_INTR_RX_OVER | IC_INTR_RX_UNDER
| IC_INTR_TX_ABRT | IC_INTR_TX_OVER)) {
i2c_disable(regs);
+ if (IS_ENABLED(CONFIG_I2C_DEBUG))
+ printk(BIOS_ERR,
+ "0x%08x: ic_raw_intr_stat, I2C read error!\n",
+ status);
return -1;
}
/* Check for timeout */
- if (stopwatch_expired(timeout))
+ if (stopwatch_expired(timeout)) {
+ if (IS_ENABLED(CONFIG_I2C_DEBUG))
+ printk(BIOS_ERR,
+ "0x%08x: ic_raw_intr_stat, I2C read timeout!\n",
+ status);
return -1;
+ }
/* Receive any available data */
status = regs->ic_status;
@@ -175,6 +193,7 @@
uint8_t chip;
uint32_t cmd;
int data_bytes;
+ int index;
int length;
I2C_REGS *regs;
uint32_t restart;
@@ -185,6 +204,22 @@
int total_bytes;
uint8_t *tx_buffer;
int tx_bytes;
+
+ if (IS_ENABLED(CONFIG_I2C_DEBUG)) {
+ for (index = 0; index < seg_count;) {
+ if (index == 0)
+ printk(BIOS_ERR, "I2C Start\n");
+ printk(BIOS_ERR, "I2C segment[%d]:\n", index);
+ printk(BIOS_ERR, " 0x%08x: read\n",
+ segment[index].read);
+ printk(BIOS_ERR, " 0x%08x: chip\n",
+ segment[index].chip);
+ printk(BIOS_ERR, " 0x%p: buf\n", segment[index].buf);
+ printk(BIOS_ERR, " 0x%08x: len\n", segment[index].len);
+ printk(BIOS_ERR, "I2C %s\n",
+ (++index >= seg_count) ? "Stop" : "Restart");
+ }
+ }
regs = get_i2c_address();
@@ -228,7 +263,8 @@
bytes_transferred = 0;
rx_buffer = NULL;
restart = 0;
- while (seg_count-- > 0) {
+ index = 0;
+ while (index++ < seg_count) {
length = segment->len;
total_bytes += length;
ASSERT(segment->buf != NULL);
@@ -236,7 +272,7 @@
ASSERT(segment->chip == chip);
/* Determine if this is the last segment of the transaction */
- stop = (seg_count == 0) ? IC_DATA_CMD_STOP : 0;
+ stop = (index == seg_count) ? IC_DATA_CMD_STOP : 0;
/* Fill the FIFO with the necessary command bytes */
if (segment->read) {
@@ -246,8 +282,13 @@
length, stop, &timeout);
/* Return any detected error */
- if (data_bytes < 0)
+ if (data_bytes < 0) {
+ if (IS_ENABLED(CONFIG_I2C_DEBUG))
+ printk(BIOS_ERR,
+ "I2C segment[%d] failed\n",
+ index);
return data_bytes;
+ }
bytes_transferred += data_bytes;
} else {
/* Write the data into the FIFO */
@@ -257,8 +298,13 @@
length, stop, rx_buffer, &timeout);
/* Return any detected error */
- if (data_bytes < 0)
+ if (data_bytes < 0) {
+ if (IS_ENABLED(CONFIG_I2C_DEBUG))
+ printk(BIOS_ERR,
+ "I2C segment[%d] failed\n",
+ index);
return data_bytes;
+ }
bytes_transferred += data_bytes;
}
segment++;
@@ -284,12 +330,29 @@
if (status & (IC_INTR_RX_OVER | IC_INTR_RX_UNDER
| IC_INTR_TX_ABRT | IC_INTR_TX_OVER)) {
i2c_disable(regs);
+ if (IS_ENABLED(CONFIG_I2C_DEBUG)) {
+ printk(BIOS_ERR,
+ "0x%08x: ic_raw_intr_stat, I2C read error!\n",
+ status);
+ printk(BIOS_ERR,
+ "I2C segment[%d] failed\n",
+ seg_count - 1);
+ }
return -1;
}
/* Check for timeout */
- if (stopwatch_expired(&timeout))
+ if (stopwatch_expired(&timeout)) {
+ if (IS_ENABLED(CONFIG_I2C_DEBUG)) {
+ printk(BIOS_ERR,
+ "0x%08x: ic_raw_intr_stat, I2C read timeout!\n",
+ status);
+ printk(BIOS_ERR,
+ "I2C segment[%d] failed\n",
+ seg_count - 1);
+ }
return -1;
+ }
/* Delay for a while */
udelay(1);
@@ -299,5 +362,8 @@
regs->ic_tar = 0;
/* Return the number of bytes transferred */
+ if (IS_ENABLED(CONFIG_I2C_DEBUG))
+ printk(BIOS_ERR, "0x%08x: bytes transferred\n",
+ bytes_transferred);
return bytes_transferred;
}
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