diff options
Diffstat (limited to 'sound/pci/cs46xx/imgs/cwcdma.asp')
| -rw-r--r-- | sound/pci/cs46xx/imgs/cwcdma.asp | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/sound/pci/cs46xx/imgs/cwcdma.asp b/sound/pci/cs46xx/imgs/cwcdma.asp deleted file mode 100644 index a65e1193c89..00000000000 --- a/sound/pci/cs46xx/imgs/cwcdma.asp +++ /dev/null @@ -1,170 +0,0 @@ -// -// Copyright(c) by Benny Sjostrand (benny@hostmobility.com) -// -// This program is free software; you can redistribute it and/or modify -// it under the terms of the GNU General Public License as published by -// the Free Software Foundation; either version 2 of the License, or -// (at your option) any later version. -// -// This program is distributed in the hope that it will be useful, -// but WITHOUT ANY WARRANTY; without even the implied warranty of -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -// GNU General Public License for more details. -// -// You should have received a copy of the GNU General Public License -// along with this program; if not, write to the Free Software -// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA -// - - -// -// This code runs inside the DSP (cs4610, cs4612, cs4624, or cs4630), -// to compile it you need a tool named SPASM 3.0 and DSP code owned by -// Cirrus Logic(R). The SPASM program will generate a object file (cwcdma.osp), -// the "ospparser" tool will genereate the cwcdma.h file it's included from -// the cs46xx_lib.c file. -// -// -// The purpose of this code is very simple: make it possible to tranfser -// the samples 'as they are' with no alteration from a PCMreader -// SCB (DMA from host) to any other SCB. This is useful for AC3 through SPDIF. -// SRC (source rate converters) task always alters the samples in somehow, -// however it's from 48khz -> 48khz. -// The alterations are not audible, but AC3 wont work. -// -// ... -// | -// +---------------+ -// | AsynchFGTxSCB | -// +---------------+ -// | -// subListPtr -// | -// +--------------+ -// | DMAReader | -// +--------------+ -// | -// subListPtr -// | -// +-------------+ -// | PCMReader | -// +-------------+ -// (DMA from host) -// - -struct dmaSCB - { - long dma_reserved1[3]; - - short dma_reserved2:dma_outBufPtr; - - short dma_unused1:dma_unused2; - - long dma_reserved3[4]; - - short dma_subListPtr:dma_nextSCB; - short dma_SPBptr:dma_entryPoint; - - long dma_strmRsConfig; - long dma_strmBufPtr; - - long dma_reserved4; - - VolumeControl s2m_volume; - }; - -#export DMAReader -void DMAReader() -{ - execChild(); - r2 = r0->dma_subListPtr; - r1 = r0->nextSCB; - - rsConfig01 = r2->strmRsConfig; - // Load rsConfig for input buffer - - rsDMA01 = r2->basicReq.daw, , tb = Z(0 - rf); - // Load rsDMA in case input buffer is a DMA buffer Test to see if there is any data to transfer - - if (tb) goto execSibling_2ind1 after { - r5 = rf + (-1); - r6 = r1->dma_entryPoint; // r6 = entry point of sibling task - r1 = r1->dma_SPBptr, // r1 = pointer to sibling task's SPB - , ind = r6; // Load entry point of sibling task - } - - rsConfig23 = r0->dma_strmRsConfig; - // Load rsConfig for output buffer (never a DMA buffer) - - r4 = r0->dma_outBufPtr; - - rsa0 = r2->strmBufPtr; - // rsa0 = input buffer pointer - - for (i = r5; i >= 0; --i) - after { - rsa2 = r4; - // rsa2 = output buffer pointer - - nop; - nop; - } - //***************************** - // TODO: cycles to this point * - //***************************** - { - acc0 = (rsd0 = *rsa0++1); - // get sample - - nop; // Those "nop"'s are really uggly, but there's - nop; // something with DSP's pipelines which I don't - nop; // understand, resulting this code to fail without - // having those "nop"'s (Benny) - - rsa0?reqDMA = r2; - // Trigger DMA transfer on input stream, - // if needed to replenish input buffer - - nop; - // Yet another magic "nop" to make stuff work - - ,,r98 = acc0 $+>> 0; - // store sample in ALU - - nop; - // latency on load register. - // (this one is understandable) - - *rsa2++1 = r98; - // store sample in output buffer - - nop; // The same story - nop; // as above again ... - nop; - } - // TODO: cycles per loop iteration - - r2->strmBufPtr = rsa0,, ; - // Update the modified buffer pointers - - r4 = rsa2; - // Load output pointer position into r4 - - r2 = r0->nextSCB; - // Sibling task - - goto execSibling_2ind1 // takes 6 cycles - after { - r98 = r2->thisSPB:entryPoint; - // Load child routine entry and data address - - r1 = r9; - // r9 is r2->thisSPB - - r0->dma_outBufPtr = r4,, - // Store updated output buffer pointer - - ind = r8; - // r8 is r2->entryPoint - } -} |