diff options
| -rw-r--r-- | drivers/remoteproc/omap_remoteproc.c | 40 |
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[] = { |