diff options
author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2017-04-24 14:45:41 +1000 |
---|---|---|
committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2017-04-28 15:11:15 +1000 |
commit | d6871cfbd2e5b6dc21098e8973b99ada120cf677 (patch) | |
tree | 278a7c0ab76127655b063868358de1e5954ad007 /hw/p8-i2c.c | |
parent | 0ccb51dcda80a9c7fded7ca45cd0ba97f81401c7 (diff) | |
download | skiboot-d6871cfbd2e5b6dc21098e8973b99ada120cf677.zip skiboot-d6871cfbd2e5b6dc21098e8973b99ada120cf677.tar.gz skiboot-d6871cfbd2e5b6dc21098e8973b99ada120cf677.tar.bz2 |
i2c: Improve logging
Log more registers, cleanup the output alignment,
and timestamp start/stop of requests
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'hw/p8-i2c.c')
-rw-r--r-- | hw/p8-i2c.c | 46 |
1 files changed, 31 insertions, 15 deletions
diff --git a/hw/p8-i2c.c b/hw/p8-i2c.c index 2216635..52520dd 100644 --- a/hw/p8-i2c.c +++ b/hw/p8-i2c.c @@ -229,10 +229,10 @@ struct p8_i2c_request { }; static void p8_i2c_print_debug_info(struct p8_i2c_master_port *port, - struct i2c_request *req) + struct i2c_request *req, uint64_t end_time) { struct p8_i2c_master *master = port->master; - uint64_t cmd, mode, stat, estat, intr; + uint64_t cmd, mode, stat, estat, intm, intc; int rc; /* Print master and request structure bits */ @@ -247,6 +247,10 @@ static void p8_i2c_print_debug_info(struct p8_i2c_master_port *port, req->dev_addr, req->offset_bytes, req->offset, req->rw_len); + log_simple_error(&e_info(OPAL_RC_I2C_TRANSFER), "I2C: " + " start_time=%016llx end_time=%016llx (duration=%016llx)\n", + master->start_time, end_time, end_time - master->start_time); + /* Dump the current state of i2c registers */ rc = xscom_read(master->chip_id, master->xscom_base + I2C_CMD_REG, &cmd); @@ -277,16 +281,23 @@ static void p8_i2c_print_debug_info(struct p8_i2c_master_port *port, } rc = xscom_read(master->chip_id, master->xscom_base + I2C_INTR_MASK_REG, - &intr); + &intm); if (rc) { prlog(PR_DEBUG, "I2C: Failed to read INTR_MASK_REG\n"); - intr = 0ull; + intm = 0ull; + } + + rc = xscom_read(master->chip_id, master->xscom_base + I2C_INTR_COND_REG, + &intc); + if (rc) { + prlog(PR_DEBUG, "I2C: Failed to read INTR_COND_REG\n"); + intc = 0ull; } log_simple_error(&e_info(OPAL_RC_I2C_TRANSFER), "I2C: Register dump--\n" - "cmd:0x%016llx\tmode:0x%016llx\tstat:0x%016llx\n" - "estat:0x%016llx\tintr:0x%016llx\n", cmd, mode, stat, - estat, intr); + " cmd:0x%016llx\tmode:0x%016llx\tstat:0x%016llx\n" + " estat:0x%016llx\tintm:0x%016llx\tintc:0x%016llx\n", + cmd, mode, stat, estat, intm, intc); } static bool p8_i2c_has_irqs(struct p8_i2c_master *master) @@ -618,7 +629,7 @@ static int p8_i2c_reset_engine(struct p8_i2c_master *master) static void p8_i2c_status_error(struct p8_i2c_master_port *port, struct i2c_request *req, - uint64_t status) + uint64_t status, uint64_t end_time) { struct p8_i2c_master *master = port->master; int rc; @@ -630,7 +641,7 @@ static void p8_i2c_status_error(struct p8_i2c_master_port *port, if (!(status & (I2C_STAT_NACK_RCVD_ERR | I2C_STAT_PSEUDO_TIMEOUT))) { log_simple_error(&e_info(OPAL_RC_I2C_TRANSFER), "I2C: Transfer error occurred\n"); - p8_i2c_print_debug_info(port, req); + p8_i2c_print_debug_info(port, req, end_time); } p8_i2c_translate_error(req, status); @@ -826,12 +837,15 @@ static void p8_i2c_complete_offset(struct p8_i2c_master *master, } static void p8_i2c_status_cmd_completion(struct p8_i2c_master *master, - struct i2c_request *req) + struct i2c_request *req, + uint64_t end_time __unused) { int rc; DBG("Command completion, state=%d bytes_sent=%d\n", master->state, master->bytes_sent); + DBG(" start_time=%016llx end_time=%016llx (duration=%016llx)\n", + master->start_time, end_time, end_time - master->start_time); /* If we complete an offset, we probably need to transition * do a data read, check if that all makes sense @@ -858,7 +872,7 @@ static void p8_i2c_check_status(struct p8_i2c_master *master) { struct p8_i2c_master_port *port; struct i2c_request *req; - uint64_t status; + uint64_t status, now = mftb(); int rc; /* If we are idle, just return, we'll catch error conditions @@ -913,11 +927,11 @@ static void p8_i2c_check_status(struct p8_i2c_master *master) /* Mask status to avoid some unrelated bit overwriting * our pseudo-status "timeout" bit 63 */ - p8_i2c_status_error(port, req, status & I2C_STAT_ANY_ERR); + p8_i2c_status_error(port, req, status & I2C_STAT_ANY_ERR, now); } else if (status & I2C_STAT_DATA_REQ) p8_i2c_status_data_request(master, req, status); else if (status & I2C_STAT_CMD_COMP) - p8_i2c_status_cmd_completion(master, req); + p8_i2c_status_cmd_completion(master, req, now); } static int p8_i2c_check_initial_status(struct p8_i2c_master_port *port) @@ -1093,6 +1107,8 @@ static int p8_i2c_start_request(struct p8_i2c_master *master, } DBG("Command: %016llx, state: %d\n", cmd, master->state); + master->start_time = mftb(); + /* Send command */ rc = xscom_write(master->chip_id, master->xscom_base + I2C_CMD_REG, cmd); @@ -1272,10 +1288,10 @@ static void p8_i2c_timeout(struct timer *t __unused, void *data, uint64_t now) /* Allright, we have a request and it has timed out ... */ log_simple_error(&e_info(OPAL_RC_I2C_TIMEOUT), "I2C: Request timeout !\n"); - p8_i2c_print_debug_info(port, req); + p8_i2c_print_debug_info(port, req, now); /* Use the standard error path */ - p8_i2c_status_error(port, req, I2C_STAT_PSEUDO_TIMEOUT); + p8_i2c_status_error(port, req, I2C_STAT_PSEUDO_TIMEOUT, now); exit: unlock(&master->lock); } |