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PCM sound, refactored code940

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@27 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-02-04 17:15:31 +00:00
parent 7573607016
commit 4f265db776
28 changed files with 914 additions and 312 deletions
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34
platform/gp2x/code940/940init.s
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@ -1,5 +1,7 @@
.global code940
.equ mmsp2_regs, (0xc0000000-0x02000000) @ assume we live @ 0x2000000 bank
code940: @ interrupt table:
b .b_reset @ reset
b .b_undef @ undefined instructions
@ -33,7 +35,7 @@ code940: @ interrupt table:
mov r12, #6
mov sp, #0x100000 @ reset stack
sub sp, sp, #4
mov r1, #0xbe000000 @ assume we live @ 0x2000000 bank
mov r1, #mmsp2_regs
orr r2, r1, #0x3B00
orr r2, r2, #0x0046
mvn r3, #0
@ -69,7 +71,7 @@ code940: @ interrupt table:
@ set up region 3: 64k 0xbe000000-0xbe010000 (hw control registers)
mov r0, #(0x0f<<1)|1
orr r0, r0, #0xbe000000
orr r0, r0, #mmsp2_regs
mcr p15, 0, r0, c6, c3, 0
mcr p15, 0, r0, c6, c3, 1
@ -88,7 +90,7 @@ code940: @ interrupt table:
mov r0, #(1<<1)
mcr p15, 0, r0, c3, c0, 0
@ set protection, allow accsess only to regions 1 and 2
@ set protection, allow access only to regions 1 and 2
mov r0, #(3<<8)|(3<<6)|(3<<4)|(3<<2)|(0) @ data: [full, full, full, full, no access] for regions [4 3 2 1 0]
mcr p15, 0, r0, c5, c0, 0
mov r0, #(0<<8)|(0<<6)|(0<<4)|(3<<2)|(0) @ instructions: [no access, no, no, full, no]
@ -98,9 +100,9 @@ code940: @ interrupt table:
orr r0, r0, #1 @ 0x00000001: enable protection unit
orr r0, r0, #4 @ 0x00000004: enable D cache
orr r0, r0, #0x1000 @ 0x00001000: enable I cache
bic r0, r0, #0xC0000000
orr r0, r0, #0x40000000 @ 0x40000000: synchronous, faster?
@ orr r0, r0, #0xC0000000 @ 0xC0000000: async
@ bic r0, r0, #0xC0000000
@ orr r0, r0, #0x40000000 @ 0x40000000: synchronous, faster?
orr r0, r0, #0xC0000000 @ 0xC0000000: async
mcr p15, 0, r0, c1, c0, 0 @ set control reg
@ flush (invalidate) the cache (just in case)
@ -109,11 +111,13 @@ code940: @ interrupt table:
.Enter:
mov r0, r12
mov r1, lr
bl Main940
@ we should never get here
.b_deadloop:
b .b_deadloop
@.b_deadloop:
@ b .b_deadloop
b .b_reserved
@ -171,13 +175,25 @@ cf_inner_loop:
.global wait_irq
wait_irq:
mov r0, #mmsp2_regs
orr r0, r0, #0x3B00
orr r1, r0, #0x0042
mov r3, #0
strh r3, [r1] @ disable interrupts
orr r2, r0, #0x003E
strh r3, [r2] @ remove busy flag
mov r3, #1
strh r3, [r1] @ enable interrupts
mrs r0, cpsr
bic r0, r0, #0x80
msr cpsr_c, r0 @ enable interrupts
msr cpsr_c, r0 @ enable interrupts
mov r0, #0
mcr p15, 0, r0, c7, c0, 4 @ wait for IRQ
@ mcr p15, 0, r0, c15, c8, 2
nop
nop
b .b_reserved
.pool