diff options
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-tpda.c')
-rw-r--r-- | drivers/hwtracing/coresight/coresight-tpda.c | 145 |
1 files changed, 86 insertions, 59 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c index 5f82737c37bb..7739bc7adc44 100644 --- a/drivers/hwtracing/coresight/coresight-tpda.c +++ b/drivers/hwtracing/coresight/coresight-tpda.c @@ -18,6 +18,7 @@ #include "coresight-priv.h" #include "coresight-tpda.h" #include "coresight-trace-id.h" +#include "coresight-tpdm.h" DEFINE_CORESIGHT_DEVLIST(tpda_devs, "tpda"); @@ -28,24 +29,59 @@ static bool coresight_device_is_tpdm(struct coresight_device *csdev) CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM); } +static void tpda_clear_element_size(struct coresight_device *csdev) +{ + struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + drvdata->dsb_esize = 0; + drvdata->cmb_esize = 0; +} + +static void tpda_set_element_size(struct tpda_drvdata *drvdata, u32 *val) +{ + /* Clear all relevant fields */ + *val &= ~(TPDA_Pn_CR_DSBSIZE | TPDA_Pn_CR_CMBSIZE); + + if (drvdata->dsb_esize == 64) + *val |= TPDA_Pn_CR_DSBSIZE; + else if (drvdata->dsb_esize == 32) + *val &= ~TPDA_Pn_CR_DSBSIZE; + + if (drvdata->cmb_esize == 64) + *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x2); + else if (drvdata->cmb_esize == 32) + *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x1); + else if (drvdata->cmb_esize == 8) + *val &= ~TPDA_Pn_CR_CMBSIZE; +} + /* - * Read the DSB element size from the TPDM device + * Read the element size from the TPDM device. One TPDM must have at least one of the + * element size property. * Returns - * The dsb element size read from the devicetree if available. - * 0 - Otherwise, with a warning once. + * 0 - The element size property is read + * Others - Cannot read the property of the element size */ -static int tpdm_read_dsb_element_size(struct coresight_device *csdev) +static int tpdm_read_element_size(struct tpda_drvdata *drvdata, + struct coresight_device *csdev) { - int rc = 0; - u8 size = 0; + int rc = -EINVAL; + struct tpdm_drvdata *tpdm_data = dev_get_drvdata(csdev->dev.parent); + + if (tpdm_has_dsb_dataset(tpdm_data)) { + rc = fwnode_property_read_u32(dev_fwnode(csdev->dev.parent), + "qcom,dsb-element-bits", &drvdata->dsb_esize); + } + if (tpdm_has_cmb_dataset(tpdm_data)) { + rc = fwnode_property_read_u32(dev_fwnode(csdev->dev.parent), + "qcom,cmb-element-bits", &drvdata->cmb_esize); + } - rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent), - "qcom,dsb-element-size", &size); if (rc) dev_warn_once(&csdev->dev, - "Failed to read TPDM DSB Element size: %d\n", rc); + "Failed to read TPDM Element size: %d\n", rc); - return size; + return rc; } /* @@ -56,11 +92,12 @@ static int tpdm_read_dsb_element_size(struct coresight_device *csdev) * Parameter "inport" is used to pass in the input port number * of TPDA, and it is set to -1 in the recursize call. */ -static int tpda_get_element_size(struct coresight_device *csdev, +static int tpda_get_element_size(struct tpda_drvdata *drvdata, + struct coresight_device *csdev, int inport) { - int dsb_size = -ENOENT; - int i, size; + int rc = 0; + int i; struct coresight_device *in; for (i = 0; i < csdev->pdata->nr_inconns; i++) { @@ -69,30 +106,26 @@ static int tpda_get_element_size(struct coresight_device *csdev, continue; /* Ignore the paths that do not match port */ - if (inport > 0 && + if (inport >= 0 && csdev->pdata->in_conns[i]->dest_port != inport) continue; if (coresight_device_is_tpdm(in)) { - size = tpdm_read_dsb_element_size(in); + if (drvdata->dsb_esize || drvdata->cmb_esize) + return -EEXIST; + rc = tpdm_read_element_size(drvdata, in); + if (rc) + return rc; } else { /* Recurse down the path */ - size = tpda_get_element_size(in, -1); - } - - if (size < 0) - return size; - - if (dsb_size < 0) { - /* Found a size, save it. */ - dsb_size = size; - } else { - /* Found duplicate TPDMs */ - return -EEXIST; + rc = tpda_get_element_size(drvdata, in, -1); + if (rc) + return rc; } } - return dsb_size; + + return rc; } /* Settings pre enabling port control register */ @@ -109,37 +142,24 @@ static void tpda_enable_pre_port(struct tpda_drvdata *drvdata) static int tpda_enable_port(struct tpda_drvdata *drvdata, int port) { u32 val; - int size; + int rc; val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port)); - /* - * Configure aggregator port n DSB data set element size - * Set the bit to 0 if the size is 32 - * Set the bit to 1 if the size is 64 - */ - size = tpda_get_element_size(drvdata->csdev, port); - switch (size) { - case 32: - val &= ~TPDA_Pn_CR_DSBSIZE; - break; - case 64: - val |= TPDA_Pn_CR_DSBSIZE; - break; - case 0: - return -EEXIST; - case -EEXIST: + tpda_clear_element_size(drvdata->csdev); + rc = tpda_get_element_size(drvdata, drvdata->csdev, port); + if (!rc && (drvdata->dsb_esize || drvdata->cmb_esize)) { + tpda_set_element_size(drvdata, &val); + /* Enable the port */ + val |= TPDA_Pn_CR_ENA; + writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port)); + } else if (rc == -EEXIST) dev_warn_once(&drvdata->csdev->dev, - "Detected multiple TPDMs on port %d", -EEXIST); - return -EEXIST; - default: - return -EINVAL; - } - - /* Enable the port */ - val |= TPDA_Pn_CR_ENA; - writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port)); + "Detected multiple TPDMs on port %d", port); + else + dev_warn_once(&drvdata->csdev->dev, + "Didn't find TPDM element size"); - return 0; + return rc; } static int __tpda_enable(struct tpda_drvdata *drvdata, int port) @@ -148,7 +168,12 @@ static int __tpda_enable(struct tpda_drvdata *drvdata, int port) CS_UNLOCK(drvdata->base); - if (!drvdata->csdev->enable) + /* + * Only do pre-port enable for first port that calls enable when the + * device's main refcount is still 0 + */ + lockdep_assert_held(&drvdata->spinlock); + if (!drvdata->csdev->refcnt) tpda_enable_pre_port(drvdata); ret = tpda_enable_port(drvdata, port); @@ -169,6 +194,7 @@ static int tpda_enable(struct coresight_device *csdev, ret = __tpda_enable(drvdata, in->dest_port); if (!ret) { atomic_inc(&in->dest_refcnt); + csdev->refcnt++; dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", in->dest_port); } } @@ -197,9 +223,10 @@ static void tpda_disable(struct coresight_device *csdev, struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); spin_lock(&drvdata->spinlock); - if (atomic_dec_return(&in->dest_refcnt) == 0) + if (atomic_dec_return(&in->dest_refcnt) == 0) { __tpda_disable(drvdata, in->dest_port); - + csdev->refcnt--; + } spin_unlock(&drvdata->spinlock); dev_dbg(drvdata->dev, "TPDA inport %d disabled\n", in->dest_port); @@ -300,7 +327,7 @@ static struct amba_id tpda_ids[] = { .id = 0x000f0f00, .mask = 0x000fff00, }, - { 0, 0}, + { 0, 0, NULL }, }; static struct amba_driver tpda_driver = { |