diff options
| author | Suzuki K Poulose <suzuki.poulose@arm.com> | 2017-08-02 18:22:13 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-28 16:05:49 +0200 |
| commit | ff11f5bc5a42f2cfc9705481eedf1b4d470ade2c (patch) | |
| tree | a3d15c9886f66e0d152c5ca60c4546a019e29aab /drivers/hwtracing | |
| parent | coresight tmc: Detect support for scatter gather (diff) | |
| download | linux-ff11f5bc5a42f2cfc9705481eedf1b4d470ade2c.tar.xz linux-ff11f5bc5a42f2cfc9705481eedf1b4d470ade2c.zip | |
coresight tmc etr: Detect address width at runtime
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>
Diffstat (limited to 'drivers/hwtracing')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-tmc.c | 26 | ||||
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-tmc.h | 4 |
2 files changed, 27 insertions, 3 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c index bb409c485d05..5bfc1b3ab80c 100644 --- a/drivers/hwtracing/coresight/coresight-tmc.c +++ b/drivers/hwtracing/coresight/coresight-tmc.c @@ -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) diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h index bb6a3e3314b8..f55203d48673 100644 --- a/drivers/hwtracing/coresight/coresight-tmc.h +++ b/drivers/hwtracing/coresight/coresight-tmc.h @@ -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, |