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author | Doug Gilbert <dgilbert@us.ibm.com> | 2017-09-29 10:00:59 -0500 |
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committer | Martha Broyles <mbroyles@us.ibm.com> | 2017-10-03 17:05:58 -0400 |
commit | 119f37bc1c1b9da19f80c4a8fbc04cb0120e1bdf (patch) | |
tree | b6633108c81c62203292349730b0094ce026459b /src/occ_gpe0/gpe_util.c | |
parent | 28ba8e805cab998dc8ca15c0a3c362d18a189c04 (diff) | |
download | talos-occ-119f37bc1c1b9da19f80c4a8fbc04cb0120e1bdf.tar.gz talos-occ-119f37bc1c1b9da19f80c4a8fbc04cb0120e1bdf.zip |
Correct gpe timebase
Change-Id: I47524f8400d1b5f2ed5423c2bea105a22a099205
CQ: SW402715
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/46917
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Christopher J. Cain <cjcain@us.ibm.com>
Reviewed-by: William A. Bryan <wilbryan@us.ibm.com>
Reviewed-by: Martha Broyles <mbroyles@us.ibm.com>
Diffstat (limited to 'src/occ_gpe0/gpe_util.c')
-rw-r--r-- | src/occ_gpe0/gpe_util.c | 33 |
1 files changed, 14 insertions, 19 deletions
diff --git a/src/occ_gpe0/gpe_util.c b/src/occ_gpe0/gpe_util.c index 59e44c1..2606a3d 100644 --- a/src/occ_gpe0/gpe_util.c +++ b/src/occ_gpe0/gpe_util.c @@ -159,29 +159,24 @@ int wait_spi_completion(GpeErrorStruct *error, uint32_t reg, uint32_t i_timeout) */ void busy_wait(uint32_t i_microseconds) { - uint32_t start_decrementer_value; // The decrementer register value at the beginning - uint32_t end_decrementer_value; // The decrementer register value at the end - uint32_t current_decrementer_value; // The current decrementer register value - uint32_t duration; - MFDEC(start_decrementer_value); // get the decrementer register value at the beginning - current_decrementer_value = start_decrementer_value; + uint32_t current_count = pk_timebase32_get(); + uint32_t end_count = current_count + + PK_INTERVAL_SCALE((uint32_t)PK_MICROSECONDS(i_microseconds)); - // multiply the delay time by the external clock frequency (~37.5 MHz) - duration = (i_microseconds * 37); - duration += (i_microseconds >> 1); - - // Calculate the decrementer register value at the end of the busy wait period - end_decrementer_value = start_decrementer_value - duration; - - if(start_decrementer_value < end_decrementer_value) // decrementer overflows during the busy wait? + // Handle wrap case + if(current_count > end_count) { - MFDEC(current_decrementer_value); - while(current_decrementer_value < end_decrementer_value) // Wait until Decrementer overflows - MFDEC(current_decrementer_value); + // let counter roll over + while(current_count > end_count) + { + current_count = pk_timebase32_get(); + } } - while (current_decrementer_value > end_decrementer_value) // Wait until end_decrementer_value is reached - MFDEC(current_decrementer_value); + while (current_count < end_count) + { + current_count = pk_timebase32_get(); + } } /* |