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coresight tmc etr: Detect address width at runtime

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TMC in Coresight SoC-600 advertises the AXI address width
in the device configuration register.

Bit 16 - AXIAW_VALID
 0 - AXI Address Width not valid
 1 - Valid AXI Address width in Bits[23-17]

Bits [23-17] - AXIAW. If AXIAW_VALID = b01 then
 0x20 - 32bit AXI address bus
 0x28 - 40bit AXI address bus
 0x2c - 44bit AXI address bus
 0x30 - 48bit AXI address bus
 0x34 - 52bit AXI address bus

Use the address bits from the device configuration register, if
available. Otherwise, default to 40bit.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose 2017-08-02 10:22:13 -06:00 committed by Greg Kroah-Hartman
parent 2e21934568
commit ff11f5bc5a
2 changed files with 27 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/hwtracing/coresight/coresight-tmc.c
View File

@ -303,16 +303,36 @@ const struct attribute_group *coresight_tmc_groups[] = {
static int tmc_etr_setup_caps(struct tmc_drvdata *drvdata,
u32 devid, void *dev_caps)
{
u32 dma_mask = 0;
/* Set the unadvertised capabilities */
tmc_etr_init_caps(drvdata, (u32)(unsigned long)dev_caps);
if (!(devid & TMC_DEVID_NOSCAT))
tmc_etr_set_cap(drvdata, TMC_ETR_SG);
/* Check if the AXI address width is available */
if (devid & TMC_DEVID_AXIAW_VALID)
dma_mask = ((devid >> TMC_DEVID_AXIAW_SHIFT) &
TMC_DEVID_AXIAW_MASK);
/*
* ETR configuration uses a 40-bit AXI master in place of
* the embedded SRAM of ETB/ETF.
* Unless specified in the device configuration, ETR uses a 40-bit
* AXI master in place of the embedded SRAM of ETB/ETF.
*/
return dma_set_mask_and_coherent(drvdata->dev, DMA_BIT_MASK(40));
switch (dma_mask) {
case 32:
case 40:
case 44:
case 48:
case 52:
dev_info(drvdata->dev, "Detected dma mask %dbits\n", dma_mask);
break;
default:
dma_mask = 40;
}
return dma_set_mask_and_coherent(drvdata->dev, DMA_BIT_MASK(dma_mask));
}
static int tmc_probe(struct amba_device *adev, const struct amba_id *id)

4
drivers/hwtracing/coresight/coresight-tmc.h
View File

@ -71,6 +71,10 @@
#define TMC_DEVID_NOSCAT BIT(24)
#define TMC_DEVID_AXIAW_VALID BIT(16)
#define TMC_DEVID_AXIAW_SHIFT 17
#define TMC_DEVID_AXIAW_MASK 0x7f
enum tmc_config_type {
TMC_CONFIG_TYPE_ETB,
TMC_CONFIG_TYPE_ETR,