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Variants for gmini dma transfers

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5852 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jean-Philippe Bernardy 2005-02-08 15:11:58 +00:00
parent 3842dc3a72
commit 9c6a549ad2
1 changed files with 29 additions and 1 deletions
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30
firmware/system.c
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@ -27,12 +27,15 @@
void* volatile interrupt_vector[16] __attribute__ ((section(".idata"))); void* volatile interrupt_vector[16] __attribute__ ((section(".idata")));
void ddma_wait_idle(void) __attribute__ ((section (".icode")));
void ddma_wait_idle(void) void ddma_wait_idle(void)
{ {
do { do {
} while ((DDMACOM & 3) != 0); } while ((DDMACOM & 3) != 0);
} }
void ddma_transfer(int dir, int mem, long intAddr, long extAddr, int num)
__attribute__ ((section (".icode")));
void ddma_transfer(int dir, int mem, long intAddr, long extAddr, int num) { void ddma_transfer(int dir, int mem, long intAddr, long extAddr, int num) {
int irq = set_irq_level(1); int irq = set_irq_level(1);
ddma_wait_idle(); ddma_wait_idle();
@ -52,6 +55,31 @@ void ddma_transfer(int dir, int mem, long intAddr, long extAddr, int num) {
set_irq_level(irq); set_irq_level(irq);
} }
static void ddma_wait_idle_noicode(void)
{
do {
} while ((DDMACOM & 3) != 0);
}
static void ddma_transfer_noicode(int dir, int mem, long intAddr, long extAddr, int num) {
int irq = set_irq_level(1);
ddma_wait_idle_noicode();
long externalAddress = (long) extAddr;
long internalAddress = (long) intAddr;
/* HW wants those two in word units. */
num /= 2;
externalAddress /= 2;
DDMACFG = (dir << 1) | (mem << 2);
DDMAIADR = internalAddress;
DDMAEADR = externalAddress;
DDMANUM = num;
DDMACOM |= 0x4; /* start */
ddma_wait_idle_noicode(); /* wait for completion */
set_irq_level(irq);
}
/* Some linker-defined symbols */ /* Some linker-defined symbols */
extern int icodecopy; extern int icodecopy;
extern int icodesize; extern int icodesize;
@ -86,7 +114,7 @@ void system_init(void)
/************************ /************************
* Copy .icode section to icram * Copy .icode section to icram
*/ */
ddma_transfer(0, 0, 0x40, (long)&icodecopy, (int)&icodesize); ddma_transfer_noicode(0, 0, 0x40, (long)&icodecopy, (int)&icodesize);
/*************************** /***************************