drm/nouveau/pwr: add helpers for delay-to-ticks and ticks-to-delay
Signed-off-by: Martin Peres <martin.peres@free.fr> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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@ -242,6 +242,80 @@ intr:
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bclr $flags $p0
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iret
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// calculate the number of ticks in the specified nanoseconds delay
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//
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// $r15 - current
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// $r14 - ns
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// $r14 - ticks (return)
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// $r0 - zero
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ticks_from_ns:
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push $r12
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push $r11
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/* try not losing precision (multiply then divide) */
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imm32($r13, HW_TICKS_PER_US)
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call #mulu32_32_64
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/* use an immeditate, it's ok because HW_TICKS_PER_US < 16 bits */
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div $r12 $r12 1000
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/* check if there wasn't any overflow */
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cmpu b32 $r11 0
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bra e #ticks_from_ns_quit
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/* let's divide then multiply, too bad for the precision! */
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div $r14 $r14 1000
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imm32($r13, HW_TICKS_PER_US)
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call #mulu32_32_64
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/* this cannot overflow as long as HW_TICKS_PER_US < 1000 */
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ticks_from_ns_quit:
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mov b32 $r14 $r12
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pop $r11
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pop $r12
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ret
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// calculate the number of ticks in the specified microsecond delay
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//
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// $r15 - current
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// $r14 - us
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// $r14 - ticks (return)
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// $r0 - zero
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ticks_from_us:
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push $r12
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push $r11
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/* simply multiply $us by HW_TICKS_PER_US */
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imm32($r13, HW_TICKS_PER_US)
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call #mulu32_32_64
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mov b32 $r14 $r12
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/* check if there wasn't any overflow */
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cmpu b32 $r11 0
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bra e #ticks_from_us_quit
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/* Overflow! */
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clear b32 $r14
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ticks_from_us_quit:
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pop $r11
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pop $r12
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ret
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// calculate the number of ticks in the specified microsecond delay
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//
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// $r15 - current
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// $r14 - ticks
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// $r14 - us (return)
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// $r0 - zero
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ticks_to_us:
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/* simply divide $ticks by HW_TICKS_PER_US */
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imm32($r13, HW_TICKS_PER_US)
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div $r14 $r14 $r13
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ret
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// request the current process be sent a message after a timeout expires
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//
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// $r15 - current
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@ -23,6 +23,7 @@
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*/
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#define NVKM_PPWR_CHIPSET GK208
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#define HW_TICKS_PER_US 324
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#define NVKM_FALCON_PC24
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#define NVKM_FALCON_UNSHIFTED_IO
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File diff suppressed because it is too large
Load diff
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@ -23,6 +23,7 @@
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*/
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#define NVKM_PPWR_CHIPSET GT215
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#define HW_TICKS_PER_US 203 // should be 202.5
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//#define NVKM_FALCON_PC24
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//#define NVKM_FALCON_UNSHIFTED_IO
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File diff suppressed because it is too large
Load diff
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@ -23,6 +23,7 @@
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*/
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#define NVKM_PPWR_CHIPSET GF100
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#define HW_TICKS_PER_US 203 // should be 202.5
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//#define NVKM_FALCON_PC24
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//#define NVKM_FALCON_UNSHIFTED_IO
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File diff suppressed because it is too large
Load diff
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@ -23,6 +23,7 @@
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*/
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#define NVKM_PPWR_CHIPSET GF119
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#define HW_TICKS_PER_US 324
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//#define NVKM_FALCON_PC24
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#define NVKM_FALCON_UNSHIFTED_IO
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File diff suppressed because it is too large
Load diff
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