coresight-stm: support mmapping channel regions with mmio_addr

CoreSight STM device allows direct mapping of the channel regions to
userspace for zero-copy writing. To support this ability, the STM
framework has provided a hook 'mmio_addr', this patch just implemented
this hook for CoreSight STM.

This patch also added an item into 'channel_space' to save the physical
base address of channel region which mmap operation needs to know.

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index 73be58a11e4f88dfb8c4ed1be109fddce8e67ae8..482c8bb27f87b3ce5e8c9e72f717ff825ee1acb4 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -105,10 +105,12 @@ module_param_named(
 /**
  * struct channel_space - central management entity for extended ports
  * @base:              memory mapped base address where channels start.
+ * @phys:              physical base address of channel region.
  * @guaraneed:         is the channel delivery guaranteed.
  */
 struct channel_space {
        void __iomem            *base;
+       phys_addr_t             phys;
        unsigned long           *guaranteed;
 };
 
@@ -356,6 +358,23 @@ static void stm_generic_unlink(struct stm_data *stm_data,
        stm_disable(drvdata->csdev);
 }
 
+static phys_addr_t
+stm_mmio_addr(struct stm_data *stm_data, unsigned int master,
+             unsigned int channel, unsigned int nr_chans)
+{
+       struct stm_drvdata *drvdata = container_of(stm_data,
+                                                  struct stm_drvdata, stm);
+       phys_addr_t addr;
+
+       addr = drvdata->chs.phys + channel * BYTES_PER_CHANNEL;
+
+       if (offset_in_page(addr) ||
+           offset_in_page(nr_chans * BYTES_PER_CHANNEL))
+               return 0;
+
+       return addr;
+}
+
 static long stm_generic_set_options(struct stm_data *stm_data,
                                    unsigned int master,
                                    unsigned int channel,
@@ -761,7 +780,9 @@ static void stm_init_generic_data(struct stm_drvdata *drvdata)
        drvdata->stm.sw_end = 1;
        drvdata->stm.hw_override = true;
        drvdata->stm.sw_nchannels = drvdata->numsp;
+       drvdata->stm.sw_mmiosz = BYTES_PER_CHANNEL;
        drvdata->stm.packet = stm_generic_packet;
+       drvdata->stm.mmio_addr = stm_mmio_addr;
        drvdata->stm.link = stm_generic_link;
        drvdata->stm.unlink = stm_generic_unlink;
        drvdata->stm.set_options = stm_generic_set_options;
@@ -808,6 +829,7 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
        ret = stm_get_resource_byname(np, "stm-stimulus-base", &ch_res);
        if (ret)
                return ret;
+       drvdata->chs.phys = ch_res.start;
 
        base = devm_ioremap_resource(dev, &ch_res);
        if (IS_ERR(base))