tcc77x: add tcc77x_cscfg_bw() helper for external memory bus width setup

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22729 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 14 insertions, 1 deletions

diff --git a/firmware/target/arm/tcc77x/iaudio7/lcd-iaudio7.c b/firmware/target/arm/tcc77x/iaudio7/lcd-iaudio7.c
index ef7e1ec140..6da0d2c083 100644
--- a/firmware/target/arm/tcc77x/iaudio7/lcd-iaudio7.c
+++ b/firmware/target/arm/tcc77x/iaudio7/lcd-iaudio7.c
@@ -128,7 +128,7 @@ static void _display_on(void)
 void lcd_init_device(void)
 {
     /* Configure external memory banks */
-    CSCFG1 = 0x2d500023 | (((MCFG >> 11) & 1) << 28);
+    CSCFG1 = 0x0d500023 | tcc77x_cscfg_bw(TCC77X_CSCFG_BW16);
 
     /* may be reset */
     GPIOA |= 0x8000;
diff --git a/firmware/target/arm/tcc77x/system-target.h b/firmware/target/arm/tcc77x/system-target.h
index 55dd52ef47..beeeac05c6 100644
--- a/firmware/target/arm/tcc77x/system-target.h
+++ b/firmware/target/arm/tcc77x/system-target.h
@@ -43,4 +43,17 @@ static inline void udelay(unsigned usecs)
     while (TIME_BEFORE(USEC_TIMER, stop));
 }
 
+
+#define TCC77X_CSCFG_BW8       0
+#define TCC77X_CSCFG_BW16      1
+
+/* Due to hardware bug or "feature" this hack is needed to set bus width bits */
+static inline
+unsigned long tcc77x_cscfg_bw(int bw) {
+    if (bw == TCC77X_CSCFG_BW8)
+        return (((MCFG >> 11) & 3) ^ 3) << 28;
+    else
+        return (((MCFG >> 11) & 3) ^ 2) << 28;
+}
+
 #endif /* SYSTEM_TARGET_H */