Author: quozl Date: Thu Apr 18 05:44:59 2013 New Revision: 3645 URL: http://tracker.coreboot.org/trac/openfirmware/changeset/3645
Log: OLPC XO-4 - add device-tree entries in /pcm to describe allocation of audio SRAM, used by kernel only. Open Firmware uses other allocations. #12400
Modified: cpu/arm/mmp3/soc-config.fth cpu/arm/olpc/sound.fth
Modified: cpu/arm/mmp3/soc-config.fth ============================================================================== --- cpu/arm/mmp3/soc-config.fth Tue Apr 16 04:16:23 2013 (r3644) +++ cpu/arm/mmp3/soc-config.fth Thu Apr 18 05:44:59 2013 (r3645) @@ -8,4 +8,8 @@ h# 2.0000 constant /audio-sram \ No need to map audio-sram separately; it fits in the SRAM area
+d# 4096 constant /audio-sram-dma \ space for DMA descriptors +d# 2048 constant /audio-sram-mps \ maximum period size +/audio-sram /audio-sram-dma - 2 / constant /audio-sram-pcm \ buffers + h# 0005.0000 constant /sram \ Size of SRAM
Modified: cpu/arm/olpc/sound.fth ============================================================================== --- cpu/arm/olpc/sound.fth Tue Apr 16 04:16:23 2013 (r3644) +++ cpu/arm/olpc/sound.fth Thu Apr 18 05:44:59 2013 (r3645) @@ -81,6 +81,25 @@ \ the Audio DMA resources " marvell,mmp-pcm-audio" +compatible \ snd_soc_dai_link.cpu_dai_of_node
+[ifdef] mmp3 + \ Our asram node (below) declares that /audio-sram bytes of SRAM + \ are assigned to the audio function. We divide that here, roughly + \ half to playback and half to recording. + + \ Even though we choose big buffers, we do leave a little bit of + \ free space for the DMA engine which also needs to use a bit of + \ the SRAM area for DMA descriptors. Therefore we choose 62kb for + \ each buffer, leaving 4kb available for DMA descriptors. + + \ For the max period size, we don't have any justification other + \ than 2048 is the value we've been using all along. + + /audio-sram-pcm encode-int + /audio-sram-mps encode-int encode+ + /audio-sram-pcm encode-int encode+ + /audio-sram-mps encode-int encode+ + " marvell,buffer-sizes" property +[then] finish-device
new-device