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Add actual PFIFO free count reading

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This commit is contained in:
Melissa Goad
2018-04-05 09:38:45 -05:00
parent 2789adca0e
commit d7eeba948a
1 changed files with 60 additions and 3 deletions
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63
src/video/vid_nv_riva128.c
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@@ -103,6 +103,8 @@ typedef struct riva128_t
uint16_t chan_dma;
uint16_t chan_size; //0 = 1024, 1 = 512
uint32_t runout_put, runout_get;
struct
{
uint32_t dmaput;
@@ -113,6 +115,9 @@ typedef struct riva128_t
{
int chanid;
int push_enabled;
int runout;
uint32_t get, put;
uint32_t ctx;
} caches[2];
struct
@@ -584,6 +589,59 @@ void riva128_pfifo_interrupt(int num, void *p)
riva128_pmc_interrupt(8, riva128);
}
uint32_t riva128_pfifo_runout_next(void *p)
{
riva128_t *riva128 = (riva128_t *)p;
uint32_t next = (riva128->pfifo.runout_put + 8) & ((riva128->pfifo.ramro_size) - 1);
return next;
}
uint32_t riva128_pfifo_cache1_next(uint32_t ptr)
{
//Apparently, PFIFO's CACHE1 uses some sort of Gray code... oh well
int bits = 5;
uint32_t tmp = ptr >> 2;
if(tmp == (1 << (bits - 1))) return 0;
for(int bit = bits - 1;bit > 0;bit--)
{
if(tmp == (1 << (bit - 1))) return ptr ^ (1 << (2 + bit));
if(tmp & (1 << bit)) tmp ^= 3 << (bit - 1);
}
return ptr ^ 4;
}
uint32_t riva128_pfifo_cache1_lin(uint32_t ptr)
{
int bits = 5;
uint32_t res = 0;
uint32_t tmp = ptr >> 2;
for(int bit = bits = 1; bit > 0; bit--)
{
if(tmp & (1 << bit))
{
tmp ^= 3 << (bit - 1);
res ^= 4 << bit;
}
}
if(tmp & 1) res ^= 4;
return res;
}
uint32_t riva128_pfifo_cache1_free(uint32_t chid, void* p)
{
riva128_t *riva128 = (riva128_t *)p;
uint32_t get = riva128_pfifo_cache1_lin(riva128->pfifo.caches[1].get);
uint32_t put = riva128_pfifo_cache1_lin(riva128->pfifo.caches[1].put);
if(riva128->pfifo.caches[1].runout) return 0;
if(chid != riva128->pfifo.caches[1].chanid || !riva128->pfifo.caches[1].push_enabled)
{
if(riva128->pfifo.caches[1].get != riva128->pfifo.caches[1].put) return 0;
return 0x7c;
}
return (get - put - 4) & 0x7c;
}
uint8_t riva128_pfifo_read(uint32_t addr, void *p)
{
riva128_t *riva128 = (riva128_t *)p;
@@ -1990,9 +2048,8 @@ uint8_t riva128_user_read(uint32_t addr, void *p)
//PIO mode
switch(offset)
{
//HACK
case 0x10: ret = 0xff; break;
case 0x11: ret = 0x7f; break;
case 0x10: ret = riva128_pfifo_cache1_free(chanid, riva128) & 0xfc; break;
case 0x11: ret = riva128_pfifo_cache1_free(chanid, riva128) >> 8; break;
}
}