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#include "drm.h"
#include "nouveau_drv.h"
#include "nouveau_reg.h"

int
nv04_timer_init(struct drm_device *dev)
{
nv_wr32(dev, NV04_PTIMER_INTR_EN_0, 0x00000000);
nv_wr32(dev, NV04_PTIMER_INTR_0, 0xFFFFFFFF);

/* Just use the pre-existing values when possible for now; these regs
* are not written in nv (driver writer missed a /4 on the address), and
* writing 8 and 3 to the correct regs breaks the timings on the LVDS
* hardware sequencing microcode.
* A correct solution (involving calculations with the GPU PLL) can
* be done when kernel modesetting lands
*/
if (!nv_rd32(dev, NV04_PTIMER_NUMERATOR) ||
!nv_rd32(dev, NV04_PTIMER_DENOMINATOR)) {
nv_wr32(dev, NV04_PTIMER_NUMERATOR, 0x00000008);
nv_wr32(dev, NV04_PTIMER_DENOMINATOR, 0x00000003);
}

return 0;
}

uint64_t
nv04_timer_read(struct drm_device *dev)
{
uint32_t low;
/* From kmmio dumps on nv28 this looks like how the blob does this.
* It reads the high dword twice, before and after.
* The only explanation seems to be that the 64-bit timer counter
* advances between high and low dword reads and may corrupt the
* result. Not confirmed.
*/
uint32_t high2 = nv_rd32(dev, NV04_PTIMER_TIME_1);
uint32_t high1;
do {
high1 = high2;
low = nv_rd32(dev, NV04_PTIMER_TIME_0);
high2 = nv_rd32(dev, NV04_PTIMER_TIME_1);
} while (high1 != high2);
return (((uint64_t)high2) << 32) | (uint64_t)low;
}
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