Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 169 insertions, 0 deletions

diff --git a/sound/pci/cs46xx/imgs/cwcdma.asp b/sound/pci/cs46xx/imgs/cwcdma.asp
new file mode 100644
index 000000000000..09d24c76f034
--- /dev/null
+++ b/sound/pci/cs46xx/imgs/cwcdma.asp
@@ -0,0 +1,169 @@
+// 
+//  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 throug SPDIF. SRC (source rate converters) 
+// task always alters the samples in some how, 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
+    }
+}