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Fix a PortalPlayer PCM bug that made keyclick malfunction. Should fix FS#8836. Move FIQ banked register init out of crt0-pp.S and into pcm-pp.c to keep setups local to PCM driver.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19388 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2008-12-11 01:48:31 +00:00
parent bbc58d5a20
commit 2e8266df12
2 changed files with 34 additions and 12 deletions
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6
firmware/target/arm/crt0-pp.S
View file

@ -252,12 +252,6 @@ cpu_init:
/* Set up stack for FIQ mode */
msr cpsr_c, #0xd1 /* IRQ/FIQ disabled */
ldr sp, =fiq_stack
/* We'll load the banked FIQ mode registers with useful values here.
These values will be used in the FIQ handler in pcm-pp.c */
ldr r10, =IIS_CONFIG
ldr r11, =dma_play_data
/* Let abort and undefined modes use IRQ stack */
msr cpsr_c, #0xd7 /* IRQ/FIQ disabled */
ldr sp, =irq_stack

40
firmware/target/arm/pcm-pp.c
View file

@ -75,7 +75,7 @@ void fiq_handler(void)
/****************************************************************************
** Playback DMA transfer
**/
struct dma_data dma_play_data SHAREDBSS_ATTR =
static struct dma_data dma_play_data SHAREDBSS_ATTR =
{
/* Initialize to a locked, stopped state */
.p = NULL,
@ -205,14 +205,17 @@ void fiq_playback(void)
"ldr r2, =pcm_callback_for_more \n"
"ldr r2, [r2] \n" /* get callback address */
"cmp r2, #0 \n" /* check for null pointer */
"stmneia r11, { r8-r9 } \n" /* save internal copies of variables back */
"movne r0, r11 \n" /* r0 = &p */
"addne r1, r11, #4 \n" /* r1 = &size */
"movne lr, pc \n" /* call pcm_callback_for_more */
"bxne r2 \n"
"beq .stop \n" /* callback removed, stop */
"stmia r11, { r8-r9 } \n" /* save internal copies of variables back */
"mov r0, r11 \n" /* r0 = &p */
"add r1, r11, #4 \n" /* r1 = &size */
"mov lr, pc \n" /* call pcm_callback_for_more */
"bx r2 \n"
"ldmia r11, { r8-r9 } \n" /* reload p and size */
"cmp r9, #0 \n" /* did we actually get more data? */
"bne .check_fifo \n"
".stop: \n" /* call termination routines */
"ldr r12, =pcm_play_dma_stop \n"
"mov lr, pc \n"
"bx r12 \n"
@ -298,6 +301,7 @@ void pcm_play_unlock(void)
static void play_start_pcm(void)
{
fiq_function = fiq_playback;
pcm_apply_settings();
IISCONFIG &= ~IIS_TXFIFOEN; /* Stop transmitting */
@ -324,6 +328,12 @@ static void play_stop_pcm(void)
{
/* Disable TX interrupt */
IIS_IRQTX_REG &= ~IIS_IRQTX;
/* Wait for FIFO to empty */
#ifdef CPU_PP502x
while (IIS_TX_FREE_COUNT < 16);
#endif
dma_play_data.state = 0;
}
@ -369,6 +379,24 @@ size_t pcm_get_bytes_waiting(void)
void pcm_play_dma_init(void)
{
/* Set up banked registers for FIQ mode */
/* Use non-banked registers for scratch. */
register volatile void *iiscfg asm("r0") = &IISCONFIG;
register volatile void *dmapd asm("r1") = &dma_play_data;
asm volatile (
"mrs r2, cpsr \n" /* Save mode and interrupt status */
"msr cpsr_c, #0xd1 \n" /* Switch to FIQ mode */
"mov r8, #0 \n"
"mov r9, #0 \n"
"mov r10, %[iiscfg] \n"
"mov r11, %[dmapd] \n"
"msr cpsr_c, r2 \n"
:
: [iiscfg]"r"(iiscfg), [dmapd]"r"(dmapd)
: "r2");
pcm_set_frequency(SAMPR_44);
/* Initialize default register values. */