gp2x: pollux: bring back ram timings

[libpicofe.git] / gp2x / soc_pollux.c

diff --git a/gp2x/soc_pollux.c b/gp2x/soc_pollux.c
index bbccede..5b0b3ff 100644 (file)
--- a/gp2x/soc_pollux.c
+++ b/gp2x/soc_pollux.c
@@ -29,10 +29,12 @@
 
 #include "soc.h"
 #include "plat_gp2x.h"
+#include "pollux_set.h"
 #include "../plat.h"
 
 static int battdev = -1, mixerdev = -1;
 static int cpu_clock_allowed;
+static unsigned short saved_memtimex[2];
 static unsigned int saved_video_regs[2][6];
 static unsigned int timer_drift; // count per real second
 
@@ -59,6 +61,26 @@ static int decode_pll(unsigned int reg)
        return v;
 }
 
+/* RAM timings */
+static void set_ram_timings(void)
+{
+       pollux_set_fromenv(memregs, "POLLUX_RAM_TIMINGS");
+}
+
+static void unset_ram_timings(void)
+{
+       int i;
+
+       memregs[0x14802>>1] = saved_memtimex[0];
+       memregs[0x14804>>1] = saved_memtimex[1] | 0x8000;
+
+       for (i = 0; i < 0x100000; i++)
+               if (!(memregs[0x14804>>1] & 0x8000))
+                       break;
+
+       printf("RAM timings reset to startup values.\n");
+}
+
 #define TIMER_BASE3 0x1980
 #define TIMER_REG(x) memregl[(TIMER_BASE3 + x) >> 2]
 
@@ -235,6 +257,11 @@ void pollux_init(void)
        }
        memregl = (volatile void *)memregs;
 
+       saved_memtimex[0] = memregs[0x14802>>1];
+       saved_memtimex[1] = memregs[0x14804>>1];
+
+       set_ram_timings();
+
        // save video regs of both MLCs
        save_multiple_regs(saved_video_regs[0], 0x4058, ARRAY_SIZE(saved_video_regs[0]));
        save_multiple_regs(saved_video_regs[1], 0x4458, ARRAY_SIZE(saved_video_regs[1]));
@@ -305,6 +332,8 @@ void pollux_finish(void)
 {
        timer_cleanup();
 
+       unset_ram_timings();
+
        restore_multiple_regs(0x4058, saved_video_regs[0],
                ARRAY_SIZE(saved_video_regs[0]));
        restore_multiple_regs(0x4458, saved_video_regs[1],