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coresight: tmc: Configure AXI write burst size 

The current driver sets the write burst size initiated by TMC-ETR on
AXI bus to a fixed value of 16. Make this configurable by reading the
value specified in fwnode. If not specified, then default to 16.

Introduced a "max_burst_size" variable in tmc_drvdata structure to
facilitate this change.

Signed-off-by: Tanmay Jagdale <tanmay@marvell.com>
Reviewed-by: Mike Leach <mike.leach@linaro.org>
Link: https://lore.kernel.org/r/20210901131049.1365367-3-tanmay@marvell.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
This commit is contained in:
Tanmay Jagdale 2021-09-01 18:40:49 +05:30 committed by Mathieu Poirier
parent 0ab47f8079
commit 4d5d88baa6
3 changed files with 26 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/hwtracing/coresight/coresight-tmc-core.c
View File

@ -432,6 +432,21 @@ static u32 tmc_etr_get_default_buffer_size(struct device *dev)
return size;
}
static u32 tmc_etr_get_max_burst_size(struct device *dev)
{
u32 burst_size;
if (fwnode_property_read_u32(dev->fwnode, "arm,max-burst-size",
&burst_size))
return TMC_AXICTL_WR_BURST_16;
/* Only permissible values are 0 to 15 */
if (burst_size > 0xF)
burst_size = TMC_AXICTL_WR_BURST_16;
return burst_size;
}
static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
{
int ret = 0;
@ -469,10 +484,12 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
/* This device is not associated with a session */
drvdata->pid = -1;
if (drvdata->config_type == TMC_CONFIG_TYPE_ETR)
if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
drvdata->size = tmc_etr_get_default_buffer_size(dev);
else
drvdata->max_burst_size = tmc_etr_get_max_burst_size(dev);
} else {
drvdata->size = readl_relaxed(drvdata->base + TMC_RSZ) * 4;
}
desc.dev = dev;
desc.groups = coresight_tmc_groups;

3
drivers/hwtracing/coresight/coresight-tmc-etr.c
View File

@ -982,7 +982,8 @@ static void __tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
axictl = readl_relaxed(drvdata->base + TMC_AXICTL);
axictl &= ~TMC_AXICTL_CLEAR_MASK;
axictl |= (TMC_AXICTL_PROT_CTL_B1 | TMC_AXICTL_WR_BURST_16);
axictl |= TMC_AXICTL_PROT_CTL_B1;
axictl |= TMC_AXICTL_WR_BURST(drvdata->max_burst_size);
axictl |= TMC_AXICTL_AXCACHE_OS;
if (tmc_etr_has_cap(drvdata, TMC_ETR_AXI_ARCACHE)) {

6
drivers/hwtracing/coresight/coresight-tmc.h
View File

@ -70,7 +70,8 @@
#define TMC_AXICTL_PROT_CTL_B0 BIT(0)
#define TMC_AXICTL_PROT_CTL_B1 BIT(1)
#define TMC_AXICTL_SCT_GAT_MODE BIT(7)
#define TMC_AXICTL_WR_BURST_16 0xF00
#define TMC_AXICTL_WR_BURST(v) (((v) & 0xf) << 8)
#define TMC_AXICTL_WR_BURST_16 0xf
/* Write-back Read and Write-allocate */
#define TMC_AXICTL_AXCACHE_OS (0xf << 2)
#define TMC_AXICTL_ARCACHE_OS (0xf << 16)
@ -174,6 +175,8 @@ struct etr_buf {
* @etr_buf: details of buffer used in TMC-ETR
* @len: size of the available trace for ETF/ETB.
* @size: trace buffer size for this TMC (common for all modes).
* @max_burst_size: The maximum burst size that can be initiated by
* TMC-ETR on AXI bus.
* @mode: how this TMC is being used.
* @config_type: TMC variant, must be of type @tmc_config_type.
* @memwidth: width of the memory interface databus, in bytes.
@ -198,6 +201,7 @@ struct tmc_drvdata {
};
u32 len;
u32 size;
u32 max_burst_size;
u32 mode;
enum tmc_config_type config_type;
enum tmc_mem_intf_width memwidth;