Coldfire targets: Adjusted PLL settings (lowest possible VCO clock for each setting) and IDE timing (especially it's faster now on M5+X5). * Added/updated table showing the necessary settings (PLL, refresh, waitstates, IDE timing) for each possible clock frequency.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13230 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 30 insertions, 5 deletions

diff --git a/firmware/target/coldfire/iaudio/system-iaudio.c b/firmware/target/coldfire/iaudio/system-iaudio.c
index 30a4f6e71b..565f75aa6d 100644
--- a/firmware/target/coldfire/iaudio/system-iaudio.c
+++ b/firmware/target/coldfire/iaudio/system-iaudio.c
@@ -24,6 +24,28 @@
 #include "timer.h"
 #include "pcf50606.h"
 
+/* Settings for all possible clock frequencies (with properly working timers)
+ *
+ *                    xxx_REFRESH_TIMER below
+ * system.h, CPUFREQ_xxx_MULT    |
+ *              |                |
+ *              V                V
+ *                   PLLCR &   Rftim.                 IDECONFIG1/IDECONFIG2
+ * CPUCLK/Hz  MULT ~0x70c00000  16MB  CSCR0   CSCR1   CS2Pre CS2Post CS2Wait
+ * -------------------------------------------------------------------------
+ *  11289600    1   0x00000200    4   0x0180  0x0180     1      1       0
+ *  22579200    2   0x05028049   10   0x0180  0x0180     1      1       0
+ *  33868800    3   0x03024049   15   0x0180  0x0180     1      1       0
+ *  45158400    4   0x05028045   21   0x0180  0x0180     1      1       0
+ *  56448000    5   0x02028049   26   0x0580  0x0580     2      1       0
+ *  67737600    6   0x03024045   32   0x0580  0x0980     2      1       0
+ *  79027200    7   0x0302a045   37   0x0580  0x0d80     2      1       0
+ *  90316800    8   0x03030045   43   0x0980  0x0d80     2      1       0
+ * 101606400    9   0x01024049   48   0x0980  0x1180     2      1       0
+ * 112896000   10   0x01028049   54   0x0980  0x1580     3      1       0
+ * 124185600   11   0x0102c049   59   0x0980  0x1180     3      1       1
+ */
+
 #define MAX_REFRESH_TIMER     59
 #define NORMAL_REFRESH_TIMER  21
 #define DEFAULT_REFRESH_TIMER 4
@@ -42,7 +64,7 @@ void set_cpu_frequency(long frequency)
         PLLCR &= ~1;  /* Bypass mode */
         timers_adjust_prescale(CPUFREQ_DEFAULT_MULT, false);
         RECALC_DELAYS(CPUFREQ_MAX);
-        PLLCR = 0x03042045 | (PLLCR & 0x70C00000);
+        PLLCR = 0x0102c049 | (PLLCR & 0x70C00000);
         CSCR0 = 0x00001180; /* Flash: 4 wait states */
         CSCR1 = 0x00000980; /* LCD: 2 wait states */
         while(!(PLLCR & 0x80000000)) {}; /* Wait until the PLL has locked.
@@ -50,7 +72,8 @@ void set_cpu_frequency(long frequency)
         timers_adjust_prescale(CPUFREQ_MAX_MULT, true);
         DCR = (0x8200 | MAX_REFRESH_TIMER);          /* Refresh timer */
         cpu_frequency = CPUFREQ_MAX;
-        IDECONFIG1 = 0x106000 | (5 << 10); /* BUFEN2 enable + CS2Pre/CS2Post */
+        IDECONFIG1 = 0x100000 | (1 << 13) | (3 << 10);
+                    /* BUFEN2 enable | CS2Post | CS2Pre */
         IDECONFIG2 = 0x40000 | (1 << 8); /* TA enable + CS2wait */
         break;
 
@@ -60,7 +83,7 @@ void set_cpu_frequency(long frequency)
         PLLCR &= ~1;  /* Bypass mode */
         timers_adjust_prescale(CPUFREQ_DEFAULT_MULT, false);
         RECALC_DELAYS(CPUFREQ_NORMAL);
-        PLLCR = 0x06030045 | (PLLCR & 0x70C00000);
+        PLLCR = 0x05028045 | (PLLCR & 0x70C00000);
         CSCR0 = 0x00000580; /* Flash: 1 wait state */
         CSCR1 = 0x00000180; /* LCD: 0 wait states */
         while(!(PLLCR & 0x80000000)) {}; /* Wait until the PLL has locked.
@@ -68,7 +91,8 @@ void set_cpu_frequency(long frequency)
         timers_adjust_prescale(CPUFREQ_NORMAL_MULT, true);
         DCR = (0x8000 | NORMAL_REFRESH_TIMER);       /* Refresh timer */
         cpu_frequency = CPUFREQ_NORMAL;
-        IDECONFIG1 = 0x106000 | (5 << 10); /* BUFEN2 enable + CS2Pre/CS2Post */
+        IDECONFIG1 = 0x100000 | (1 << 13) | (1 << 10);
+                    /* BUFEN2 enable | CS2Post | CS2Pre */
         IDECONFIG2 = 0x40000 | (0 << 8); /* TA enable + CS2wait */
         break;
     default:
@@ -83,7 +107,8 @@ void set_cpu_frequency(long frequency)
         CSCR1 = 0x00000180; /* LCD: 0 wait states */
         DCR = (0x8000 | DEFAULT_REFRESH_TIMER);       /* Refresh timer */
         cpu_frequency = CPUFREQ_DEFAULT;
-        IDECONFIG1 = 0x106000 | (1 << 10); /* BUFEN2 enable + CS2Pre/CS2Post */
+        IDECONFIG1 = 0x100000 | (1 << 13) | (1 << 10);
+                    /* BUFEN2 enable | CS2Post | CS2Pre */
         IDECONFIG2 = 0x40000 | (0 << 8); /* TA enable + CS2wait */
         break;
     }