Hi Ohad, On 05/09/2015 02:54 AM, Ohad Ben-Cohen wrote: > Hi Dave, > > On Wed, Apr 1, 2015 at 10:37 PM, Dave Gerlach <d-gerlach@xxxxxx> wrote: >> From: Suman Anna <s-anna@xxxxxx> >> >> The rproc_da_to_va API is currently used to perform any device to >> kernel address translations to meet the different needs of the remoteproc >> core/drivers (eg: loading). The functionality is achieved within the >> remoteproc core, and is limited only for carveouts allocated within the >> core. >> >> A new rproc ops, da_to_va, is added to provide flexibility to platform >> implementations to perform the address translation themselves when the >> above conditions cannot be met by the implementations. The rproc_da_to_va() >> API is extended to invoke this ops if present, and fallback to regular >> processing if the platform implementation cannot provide the translation. >> This will allow any remoteproc implementations to translate addresses for >> dedicated memories like internal memories. > > Can you please provide specific examples where this is needed and how > it is going to be used? We will be using this for the WkupM3 remoteproc driver, and also using it for a PRUSS remoteproc driver (on downstream kernel for now) on TI AM335x/AM437x SoCs. The driver uses a firmware where all segments are placed only in internal RAMs (nothing in DDR), and we use the remoteproc core's ELF loader code to perform the loading. We need a way for the remoteproc elf loader core to be able to translate these device addresses into a kernel mapped addresses so that the loader code can copy the firmware segments. The previous attempt on this was to use a new resource type through the resource table, whereby we are publishing and storing the internal memory translations were stored in the remoteproc core [1]. regards Suman [1] https://patchwork.kernel.org/patch/5602981/ -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
