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authorSuman Anna <s-anna@ti.com>2020-03-24 14:00:25 +0300
committerBjorn Andersson <bjorn.andersson@linaro.org>2020-03-26 08:29:47 +0300
commit530a1b57e8590f2ebbb6a35effa0efa988aabf6c (patch)
tree050ea968d2b1ba506877740555084854a152090f /drivers/remoteproc
parent4a032199d3f7c59e450ed78aa5306a12226987a7 (diff)
downloadlinux-530a1b57e8590f2ebbb6a35effa0efa988aabf6c.tar.xz
remoteproc/omap: Add the rproc ops .da_to_va() implementation
An implementation for the rproc ops .da_to_va() has been added that provides the address translation between device addresses to kernel virtual addresses for internal RAMs present on that particular remote processor device. The implementation provides the translations based on the addresses parsed and stored during the probe. This ops gets invoked by the exported rproc_da_to_va() function and allows the remoteproc core's ELF loader to be able to load program data directly into the internal memories. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Tero Kristo <t-kristo@ti.com> Reviewed-by: Andrew F. Davis <afd@ti.com> Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200324110035.29907-6-t-kristo@ti.com Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'drivers/remoteproc')
-rw-r--r--drivers/remoteproc/omap_remoteproc.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c
index cdcc9c227b96..fecc68e6d3a8 100644
--- a/drivers/remoteproc/omap_remoteproc.c
+++ b/drivers/remoteproc/omap_remoteproc.c
@@ -245,10 +245,50 @@ static int omap_rproc_stop(struct rproc *rproc)
return 0;
}
+/**
+ * omap_rproc_da_to_va() - internal memory translation helper
+ * @rproc: remote processor to apply the address translation for
+ * @da: device address to translate
+ * @len: length of the memory buffer
+ *
+ * Custom function implementing the rproc .da_to_va ops to provide address
+ * translation (device address to kernel virtual address) for internal RAMs
+ * present in a DSP or IPU device). The translated addresses can be used
+ * either by the remoteproc core for loading, or by any rpmsg bus drivers.
+ *
+ * Return: translated virtual address in kernel memory space on success,
+ * or NULL on failure.
+ */
+static void *omap_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len)
+{
+ struct omap_rproc *oproc = rproc->priv;
+ int i;
+ u32 offset;
+
+ if (len <= 0)
+ return NULL;
+
+ if (!oproc->num_mems)
+ return NULL;
+
+ for (i = 0; i < oproc->num_mems; i++) {
+ if (da >= oproc->mem[i].dev_addr && da + len <=
+ oproc->mem[i].dev_addr + oproc->mem[i].size) {
+ offset = da - oproc->mem[i].dev_addr;
+ /* __force to make sparse happy with type conversion */
+ return (__force void *)(oproc->mem[i].cpu_addr +
+ offset);
+ }
+ }
+
+ return NULL;
+}
+
static const struct rproc_ops omap_rproc_ops = {
.start = omap_rproc_start,
.stop = omap_rproc_stop,
.kick = omap_rproc_kick,
+ .da_to_va = omap_rproc_da_to_va,
};
static const struct omap_rproc_mem_data ipu_mems[] = {