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coresight: tmc: Make memory width mask computation into a function

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Make the computation of a memory mask representing the width of the memory
bus into a function so that it can be re-used by the ETR driver.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Leo Yan <leo.yan@linaro.org>
Link: https://lore.kernel.org/r/20190829202842.580-16-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Poirier 2019-08-29 14:28:40 -06:00 committed by Greg Kroah-Hartman
parent bbedcb91cc
commit 00bb485ce7
3 changed files with 31 additions and 21 deletions
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23
drivers/hwtracing/coresight/coresight-tmc-etf.c
View File

@ -479,30 +479,11 @@ static unsigned long tmc_update_etf_buffer(struct coresight_device *csdev,
* traces.
*/
if (!buf->snapshot && to_read > handle->size) {
u32 mask = 0;
/*
* The value written to RRP must be byte-address aligned to
* the width of the trace memory databus _and_ to a frame
* boundary (16 byte), whichever is the biggest. For example,
* for 32-bit, 64-bit and 128-bit wide trace memory, the four
* LSBs must be 0s. For 256-bit wide trace memory, the five
* LSBs must be 0s.
*/
switch (drvdata->memwidth) {
case TMC_MEM_INTF_WIDTH_32BITS:
case TMC_MEM_INTF_WIDTH_64BITS:
case TMC_MEM_INTF_WIDTH_128BITS:
mask = GENMASK(31, 4);
break;
case TMC_MEM_INTF_WIDTH_256BITS:
mask = GENMASK(31, 5);
break;
}
u32 mask = tmc_get_memwidth_mask(drvdata);
/*
* Make sure the new size is aligned in accordance with the
* requirement explained above.
* requirement explained in function tmc_get_memwidth_mask().
*/
to_read = handle->size & mask;
/* Move the RAM read pointer up */

28
drivers/hwtracing/coresight/coresight-tmc.c
View File

@ -70,6 +70,34 @@ void tmc_disable_hw(struct tmc_drvdata *drvdata)
writel_relaxed(0x0, drvdata->base + TMC_CTL);
}
u32 tmc_get_memwidth_mask(struct tmc_drvdata *drvdata)
{
u32 mask = 0;
/*
* When moving RRP or an offset address forward, the new values must
* be byte-address aligned to the width of the trace memory databus
* _and_ to a frame boundary (16 byte), whichever is the biggest. For
* example, for 32-bit, 64-bit and 128-bit wide trace memory, the four
* LSBs must be 0s. For 256-bit wide trace memory, the five LSBs must
* be 0s.
*/
switch (drvdata->memwidth) {
case TMC_MEM_INTF_WIDTH_32BITS:
/* fallthrough */
case TMC_MEM_INTF_WIDTH_64BITS:
/* fallthrough */
case TMC_MEM_INTF_WIDTH_128BITS:
mask = GENMASK(31, 4);
break;
case TMC_MEM_INTF_WIDTH_256BITS:
mask = GENMASK(31, 5);
break;
}
return mask;
}
static int tmc_read_prepare(struct tmc_drvdata *drvdata)
{
int ret = 0;

1
drivers/hwtracing/coresight/coresight-tmc.h
View File

@ -255,6 +255,7 @@ void tmc_wait_for_tmcready(struct tmc_drvdata *drvdata);
void tmc_flush_and_stop(struct tmc_drvdata *drvdata);
void tmc_enable_hw(struct tmc_drvdata *drvdata);
void tmc_disable_hw(struct tmc_drvdata *drvdata);
u32 tmc_get_memwidth_mask(struct tmc_drvdata *drvdata);
/* ETB/ETF functions */
int tmc_read_prepare_etb(struct tmc_drvdata *drvdata);