Meg-FX: Enable a real tick in the bootloader. Do cleanups before switching to firmware and cache handling. Put proper main return address in lr.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19368 a1c6a512-1295-4272-9138-f99709370657

bootloader/gigabeat.c

@@ -75,11 +75,14 @@ void main(void)
     int(*kernel_entry)(void);
 
     system_init();
+    kernel_init(); /* Need the kernel to sleep */
+
+    enable_interrupt(IRQ_FIQ_STATUS);
+
     lcd_init();
     backlight_init();
     button_init();
     font_init();
-    kernel_init(); /* Need the kernel to sleep */
     adc_init();
 
     lcd_setfont(FONT_SYSFIXED);
@@ -192,6 +195,9 @@ void main(void)
 
     printf("Loading firmware");
 
+    /* Flush out anything pending first */
+    invalidate_icache();
+
     loadbuffer = (unsigned char*) 0x31000000;
     buffer_size = (unsigned char*)0x31400000 - loadbuffer;
 
@@ -199,10 +205,22 @@ void main(void)
     if(rc < 0)
         error(EBOOTFILE, rc);
 
+    storage_close();
+    system_prepare_fw_start();
+
     if (rc == EOK)
     {
+        invalidate_icache();
         kernel_entry = (void*) loadbuffer;
         rc = kernel_entry();
     }
+
+#if 0
+    /* Halt */
+    while (1)
+        core_idle();
+#else
+    /* Return and restart */
+#endif
 }
 

firmware/kernel.c

@@ -244,10 +244,7 @@ void timeout_register(struct timeout *tmo, timeout_cb_type callback,
  ****************************************************************************/
 void sleep(int ticks)
 {
-#if CONFIG_CPU == S3C2440 && defined(BOOTLOADER)
+#if defined(CPU_PP) && defined(BOOTLOADER)
-    extern void delay(int ticks);
-    delay(ticks);
-#elif defined(CPU_PP) && defined(BOOTLOADER)
     unsigned stop = USEC_TIMER + ticks * (1000000/HZ);
     while (TIME_BEFORE(USEC_TIMER, stop))
         switch_thread();
@@ -265,7 +262,7 @@ void sleep(int ticks)
 
 void yield(void)
 {
-#if ((CONFIG_CPU == S3C2440 || defined(ELIO_TPJ1022)) && defined(BOOTLOADER))
+#if ((defined(ELIO_TPJ1022)) && defined(BOOTLOADER))
     /* Some targets don't like yielding in the bootloader */
 #else
     switch_thread();

firmware/target/arm/s3c2440/crt0.S

@@ -467,6 +467,7 @@ stackmunge:
     ldr     sp, =stackend
 
     /* Start the main function */
+    adr     lr, vectors
     ldr     pc, =main
 
     /* Should never get here, but let's restart in case (also needed for

firmware/target/arm/s3c2440/gigabeat-fx/ata-target.h

@@ -21,6 +21,10 @@
 #ifndef ATA_TARGET_H
 #define ATA_TARGET_H
 
+#ifdef BOOTLOADER
+#define ATA_DRIVER_CLOSE
+#endif
+
 /* Plain C read & write loops */
 #define PREFER_C_READING
 #define PREFER_C_WRITING

firmware/target/arm/s3c2440/gigabeat-fx/kernel-meg-fx.c

@@ -24,7 +24,7 @@
 #include "timer.h"
 #include "thread.h"
 
-static inline void tick_set(unsigned int interval_in_ms)
+void tick_start(unsigned int interval_in_ms)
 {
     /*
      * Based on default PCLK of 49.1568MHz - scaling chosen to give
@@ -49,11 +49,6 @@ static inline void tick_set(unsigned int interval_in_ms)
     TCON |= 1 << 21;
     /* reset manual bit */
     TCON &= ~(1 << 21);
-}
-
-void tick_start(unsigned int interval_in_ms)
-{
-    tick_set(interval_in_ms);
 
     /* interval mode */
     TCON |= 1 << 22;
@@ -65,24 +60,14 @@ void tick_start(unsigned int interval_in_ms)
 }
 
 #ifdef BOOTLOADER
-void delay(int ticks)
+void tick_stop(void)
 {
-    volatile unsigned long counter;
+    s3c_regset32(&INTMSK, TIMER4_MASK);
-
+    TCON &= ~(1 << 20);
-    INTMSK |= TIMER4_MASK;
+    SRCPND = TIMER4_MASK;
-
+    INTPND = TIMER4_MASK;
-    tick_set(1000 * ticks / HZ);
-
-    /* autoreload Off */
-    TCON &= ~(1 << 22);
-    /* start timer 4 */
-    TCON |= (1 << 20);
-
-    do {
-        counter = TCNTO4;
-    } while(counter > 0);
 }
-#endif /* BOOTLOADER */
+#endif
 
 void TIMER4(void)
 {

firmware/target/arm/s3c2440/gigabeat-fx/system-meg-fx.c

@@ -143,6 +143,15 @@ void s3c_regclr32(volatile unsigned long *reg, unsigned long bits)
     s3c_regmod32(reg, 0, bits);
 }
 
+#ifdef BOOTLOADER
+void system_prepare_fw_start(void)
+{
+    tick_stop();
+    disable_interrupt(IRQ_FIQ_STATUS);
+    INTMSK = 0xFFFFFFFF;
+}
+#endif
+
 void system_init(void)
 {
     INTMSK = 0xFFFFFFFF;

firmware/target/arm/s3c2440/gigabeat-fx/system-target.h

@@ -28,6 +28,9 @@
 #define CPUFREQ_NORMAL  98784000
 #define CPUFREQ_MAX    296352000
 
+void system_prepare_fw_start(void);
+void tick_stop(void);
+
 /* Functions to set and clear regiser bits atomically */
 
 /* Set and clear register bits */