Sansa AMS PCM: remove runtime sanity checks

Unaligned memory ops will cause a data abort anyway
Make the check for samplerate at buildtime

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23480 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 15 insertions, 8 deletions

diff --git a/firmware/target/arm/as3525/clock-target.h b/firmware/target/arm/as3525/clock-target.h
index 560e067..81926c1 100644
--- a/firmware/target/arm/as3525/clock-target.h
+++ b/firmware/target/arm/as3525/clock-target.h
@@ -132,21 +132,35 @@
 #if (CLK_DIV(AS3525_PLLA_FREQ, AS3525_PCLK_FREQ) - 1) >= (1<<4) /* 4 bits */
 #error PCLK frequency is too low : clock divider will not fit !
 #endif
+
 /*  AS3525_DBOP_FREQ */
 #if (CLK_DIV(AS3525_PCLK_FREQ, AS3525_DBOP_FREQ) - 1) >= (1<<3) /* 3 bits */
 #error DBOP frequency is too low : clock divider will not fit !
 #endif
+
 /* AS3525_IDE_FREQ */
 #if (CLK_DIV(AS3525_PLLA_FREQ, AS3525_IDE_FREQ) - 1) >= (1<<4) /* 4 bits */
 #error IDE frequency is too low : clock divider will not fit !
 #endif
+
 /* AS3525_I2C_FREQ */
 #if (CLK_DIV(AS3525_PCLK_FREQ, AS3525_I2C_FREQ)) >= (1<<10) /* 2+8 bits */
 #error I2C frequency is too low : clock divider will not fit !
 #endif
+
 /* AS3525_SD_IDENT_FREQ */
 #if ((CLK_DIV(AS3525_PCLK_FREQ, AS3525_SD_IDENT_FREQ) / 2) - 1) >= (1<<8) /* 8 bits */
 #error SD IDENTIFICATION frequency is too low : clock divider will not fit !
 #endif
 
+/* I2SIN / I2SOUT frequencies */
+/* low samplerate */
+#if ((AS3525_PLLA_FREQ/(128*8000))) > 512   /* 8kHz = lowest frequency */
+#error PLLA frequency is too low for 8kHz samplerate !
+#endif
+/* high samplerate */
+#if ((AS3525_PLLA_FREQ/(128*96000))) < 1   /* 96kHz = highest frequency */
+#error PLLA frequency is too high for 96kHz samplerate !
+#endif
+
 #endif /* CLOCK_TARGET_H */
diff --git a/firmware/target/arm/as3525/pcm-as3525.c b/firmware/target/arm/as3525/pcm-as3525.c
index f648908..26e018c 100644
--- a/firmware/target/arm/as3525/pcm-as3525.c
+++ b/firmware/target/arm/as3525/pcm-as3525.c
@@ -61,9 +61,6 @@ static void play_start_pcm(void)
     if(size > MAX_TRANSFER)
         size = MAX_TRANSFER;
 
-    if((unsigned int)dma_start_addr & 3)
-        panicf("unaligned pointer!");
-
     dma_size -= size;
     dma_start_addr += size;
 
@@ -148,9 +145,8 @@ void pcm_dma_apply_settings(void)
 {
     unsigned long frequency = pcm_sampr;
 
+    /* TODO : use a table ? */
     const int divider = (((AS3525_PLLA_FREQ/128) + (frequency/2)) / frequency) - 1;
-    if(divider < 0 || divider > 511)
-        panicf("unsupported frequency %ld", frequency);
 
     int cgu_audio = CGU_AUDIO;  /* read register */
     cgu_audio &= ~(511 << 2);   /* clear i2sout divider */
@@ -266,9 +262,6 @@ void pcm_rec_dma_start(void *addr, size_t size)
     rec_start_addr = addr;
     rec_size = size;
 
-    if((unsigned int)addr & 3)
-        panicf("unaligned pointer!");
-
     CGU_PERI |= CGU_I2SIN_APB_CLOCK_ENABLE|CGU_I2SOUT_APB_CLOCK_ENABLE;
     CGU_AUDIO |= ((1<<23)|(1<<11));