From cab33b64a02cc17e9da85695817e6196cec4a345 Mon Sep 17 00:00:00 2001
From: Nils Wallménius <nils@rockbox.org>
Date: Tue, 11 Sep 2007 15:34:54 +0000
Subject: Accept patch in FS#7751 by Catalin Patulea, move ifp port specific
 pcm code to a new file

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14670 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/arm/pnx0101/pcm-pnx0101.c | 161 ++++++++++++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 firmware/target/arm/pnx0101/pcm-pnx0101.c

(limited to 'firmware/target/arm/pnx0101/pcm-pnx0101.c')

diff --git a/firmware/target/arm/pnx0101/pcm-pnx0101.c b/firmware/target/arm/pnx0101/pcm-pnx0101.c
new file mode 100644
index 0000000000..8b076cc918
--- /dev/null
+++ b/firmware/target/arm/pnx0101/pcm-pnx0101.c
@@ -0,0 +1,161 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Tomek Malesinski
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "system.h"
+#include "audio.h"
+#include "string.h"
+
+#define DMA_BUF_SAMPLES 0x100
+
+short __attribute__((section(".dmabuf"))) dma_buf_left[DMA_BUF_SAMPLES];
+short __attribute__((section(".dmabuf"))) dma_buf_right[DMA_BUF_SAMPLES];
+
+/* From pcm_playback.c */
+extern unsigned short* p;
+extern size_t p_size;
+
+static inline void fill_dma_buf(int offset)
+{
+    short *l, *r, *lend;
+
+    l = dma_buf_left + offset;
+    lend = l + DMA_BUF_SAMPLES / 2;
+    r = dma_buf_right + offset;
+
+    if (pcm_playing && !pcm_paused)
+    {
+        do
+        {
+            int count;
+            unsigned short *tmp_p;
+            count = MIN(p_size / 4, (size_t)(lend - l));
+            tmp_p = p;
+            p_size -= count * 4;
+
+            if ((int)l & 3)
+            {
+                *l++ = *tmp_p++;
+                *r++ = *tmp_p++;
+                count--;
+            }
+            while (count >= 4)
+            {
+                asm("ldmia %0!, {r0, r1, r2, r3}\n\t"
+                    "and   r4, r0, %3\n\t"
+                    "orr   r4, r4, r1, lsl #16\n\t"
+                    "and   r5, r2, %3\n\t"
+                    "orr   r5, r5, r3, lsl #16\n\t"
+                    "stmia %1!, {r4, r5}\n\t"
+                    "bic   r4, r1, %3\n\t"
+                    "orr   r4, r4, r0, lsr #16\n\t"
+                    "bic   r5, r3, %3\n\t"
+                    "orr   r5, r5, r2, lsr #16\n\t"
+                    "stmia %2!, {r4, r5}"
+                    : "+r" (tmp_p), "+r" (l), "+r" (r)
+                    : "r" (0xffff)
+                    : "r0", "r1", "r2", "r3", "r4", "r5", "memory");
+                count -= 4;
+            }
+            while (count > 0)
+            {
+                *l++ = *tmp_p++;
+                *r++ = *tmp_p++;
+                count--;
+            }
+            p = tmp_p;
+            if (l >= lend)
+                return;
+            else if (pcm_callback_for_more)
+                pcm_callback_for_more((unsigned char**)&p,
+                                  &p_size);
+        }
+        while (p_size);
+        pcm_playing = false;
+    }
+
+    if (l < lend)
+    {
+        memset(l, 0, sizeof(short) * (lend - l));
+        memset(r, 0, sizeof(short) * (lend - l));
+    }
+}
+
+static void audio_irq(void)
+{
+    unsigned long st = DMAINTSTAT & ~DMAINTEN;
+    int i;
+    for (i = 0; i < 2; i++)
+        if (st & (1 << i))
+        {
+            fill_dma_buf((i == 1) ? 0 : DMA_BUF_SAMPLES / 2);
+            DMAINTSTAT = 1 << i;
+        }
+}
+
+unsigned long physical_address(void *p)
+{
+    unsigned long adr = (unsigned long)p;
+    return (MMUBLOCK((adr >> 21) & 0xf) << 21) | (adr & ((1 << 21) - 1));
+}
+
+void pcm_init(void)
+{
+    int i;
+
+    pcm_playing = false;
+    pcm_paused = false;
+    pcm_callback_for_more = NULL;
+
+    memset(dma_buf_left, 0, sizeof(dma_buf_left));
+    memset(dma_buf_right, 0, sizeof(dma_buf_right));
+
+    for (i = 0; i < 8; i++)
+    {
+        DMASRC(i) = 0;
+        DMADEST(i) = 0;
+        DMALEN(i) = 0x1ffff;
+        DMAR0C(i) = 0;
+        DMAR10(i) = 0;
+        DMAR1C(i) = 0;
+    }
+
+    DMAINTSTAT = 0xc000ffff;
+    DMAINTEN = 0xc000ffff;
+    
+    DMASRC(0) = physical_address(dma_buf_left);
+    DMADEST(0) = 0x80200280;
+    DMALEN(0) = 0xff;
+    DMAR1C(0) = 0;
+    DMAR0C(0) = 0x40408;
+
+    DMASRC(1) = physical_address(dma_buf_right);
+    DMADEST(1) = 0x80200284;
+    DMALEN(1) = 0xff;
+    DMAR1C(1) = 0;
+    DMAR0C(1) = 0x40409;
+
+    irq_set_int_handler(0x1b, audio_irq);
+    irq_enable_int(0x1b);
+
+    DMAINTSTAT = 1;
+    DMAINTSTAT = 2;
+    DMAINTEN &= ~3;
+    DMAR10(0) |= 1;
+    DMAR10(1) |= 1;
+}
+
-- 
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