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redo OSS frag setup. Compute real pollux rate

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@896 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2010-09-17 22:57:14 +00:00
parent 45285368c0
commit 9f6a4e907b
6 changed files with 88 additions and 68 deletions
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53
platform/gp2x/soc_pollux.c
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@ -39,7 +39,8 @@ static int fbdev = -1;
static char cpuclk_was_changed = 0;
static unsigned short memtimex_old[2];
static unsigned int pllsetreg0;
static unsigned int pllsetreg0_old;
static unsigned int timer_drift; // count per real second
static int last_pal_setting = 0;
@ -219,13 +220,13 @@ static int gp2x_read_battery_(void)
#define TIMER_BASE3 0x1980
#define TIMER_REG(x) memregl[(TIMER_BASE3 + x) >> 2]
unsigned int gp2x_get_ticks_us_(void)
static unsigned int gp2x_get_ticks_us_(void)
{
TIMER_REG(0x08) = 0x4b; /* run timer, latch value */
return TIMER_REG(0);
}
unsigned int gp2x_get_ticks_ms_(void)
static unsigned int gp2x_get_ticks_ms_(void)
{
/* approximate /= 1000 */
unsigned long long v64;
@ -261,10 +262,42 @@ static int decode_pll(unsigned int reg)
return v;
}
int pollux_get_real_snd_rate(int req_rate)
{
int clk0_src, clk1_src, rate, div;
clk0_src = (memregl[0xdbc4>>2] >> 1) & 7;
clk1_src = (memregl[0xdbc8>>2] >> 1) & 7;
if (clk0_src > 1 || clk1_src != 7) {
fprintf(stderr, "get_real_snd_rate: bad clk sources: %d %d\n", clk0_src, clk1_src);
return req_rate;
}
rate = decode_pll(clk0_src ? memregl[0xf008>>2] : memregl[0xf004>>2]);
// apply divisors
div = ((memregl[0xdbc4>>2] >> 4) & 0x1f) + 1;
rate /= div;
div = ((memregl[0xdbc8>>2] >> 4) & 0x1f) + 1;
rate /= div;
rate /= 64;
//printf("rate %d\n", rate);
rate -= rate * timer_drift / 1000000;
printf("adjusted rate: %d\n", rate);
if (rate < 8000-1000 || rate > 44100+1000) {
fprintf(stderr, "get_real_snd_rate: got bad rate: %d\n", rate);
return req_rate;
}
return rate;
}
void pollux_init(void)
{
struct fb_fix_screeninfo fbfix;
int i, ret, rate;
int i, ret, rate, timer_div;
memdev = open("/dev/mem", O_RDWR);
if (memdev == -1) {
@ -320,16 +353,18 @@ void pollux_init(void)
/* find what PLL1 runs at, for the timer */
rate = decode_pll(memregl[0xf008>>2]);
printf("PLL1 @ %dHz\n", rate);
rate /= 1000000;
/* setup timer */
if (1 <= rate && rate <= 256) {
timer_div = (rate + 500000) / 1000000;
if (1 <= timer_div && timer_div <= 256) {
timer_drift = (rate - (timer_div * 1000000)) / timer_div;
if (TIMER_REG(0x08) & 8) {
fprintf(stderr, "warning: timer in use, overriding!\n");
timer_cleanup();
}
TIMER_REG(0x44) = ((rate - 1) << 4) | 2; /* using PLL1, divide by it's rate */
TIMER_REG(0x44) = ((timer_div - 1) << 4) | 2; /* using PLL1, divide by it's rate */
TIMER_REG(0x40) = 0x0c; /* clocks on */
TIMER_REG(0x08) = 0x6b; /* run timer, clear irq, latch value */
@ -344,7 +379,7 @@ void pollux_init(void)
gp2x_get_ticks_us = plat_get_ticks_us_good;
}
pllsetreg0 = memregl[0xf004>>2];
pllsetreg0_old = memregl[0xf004>>2];
memtimex_old[0] = memregs[0x14802>>1];
memtimex_old[1] = memregs[0x14804>>1];
@ -384,7 +419,7 @@ void pollux_finish(void)
gp2x_video_changemode_ll_(16);
unset_ram_timings_();
if (cpuclk_was_changed) {
memregl[0xf004>>2] = pllsetreg0;
memregl[0xf004>>2] = pllsetreg0_old;
memregl[0xf07c>>2] |= 0x8000;
}
timer_cleanup();