diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/kernel.fuc')
| -rw-r--r-- | drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/kernel.fuc | 122 |
1 files changed, 112 insertions, 10 deletions
diff --git a/drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/kernel.fuc b/drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/kernel.fuc index 8f29badd785f..5cf5be63cbef 100644 --- a/drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/kernel.fuc +++ b/drivers/gpu/drm/nouveau/core/subdev/pwr/fuc/kernel.fuc @@ -98,12 +98,16 @@ wr32: // $r14 - ns // $r0 - zero nsec: + push $r9 + push $r8 nv_iord($r8, NV_PPWR_TIMER_LOW) nsec_loop: nv_iord($r9, NV_PPWR_TIMER_LOW) sub b32 $r9 $r8 cmp b32 $r9 $r14 bra l #nsec_loop + pop $r8 + pop $r9 ret // busy-wait for a period of time @@ -115,6 +119,8 @@ nsec: // $r11 - timeout (ns) // $r0 - zero wait: + push $r9 + push $r8 nv_iord($r8, NV_PPWR_TIMER_LOW) wait_loop: nv_rd32($r10, $r14) @@ -126,6 +132,8 @@ wait: cmp b32 $r9 $r11 bra l #wait_loop wait_done: + pop $r8 + pop $r9 ret // $r15 - current (kern) @@ -242,12 +250,89 @@ intr: bclr $flags $p0 iret -// request the current process be sent a message after a timeout expires +// calculate the number of ticks in the specified nanoseconds delay +// +// $r15 - current +// $r14 - ns +// $r14 - ticks (return) +// $r0 - zero +ticks_from_ns: + push $r12 + push $r11 + + /* try not losing precision (multiply then divide) */ + imm32($r13, HW_TICKS_PER_US) + call #mulu32_32_64 + + /* use an immeditate, it's ok because HW_TICKS_PER_US < 16 bits */ + div $r12 $r12 1000 + + /* check if there wasn't any overflow */ + cmpu b32 $r11 0 + bra e #ticks_from_ns_quit + + /* let's divide then multiply, too bad for the precision! */ + div $r14 $r14 1000 + imm32($r13, HW_TICKS_PER_US) + call #mulu32_32_64 + + /* this cannot overflow as long as HW_TICKS_PER_US < 1000 */ + +ticks_from_ns_quit: + mov b32 $r14 $r12 + pop $r11 + pop $r12 + ret + +// calculate the number of ticks in the specified microsecond delay +// +// $r15 - current +// $r14 - us +// $r14 - ticks (return) +// $r0 - zero +ticks_from_us: + push $r12 + push $r11 + + /* simply multiply $us by HW_TICKS_PER_US */ + imm32($r13, HW_TICKS_PER_US) + call #mulu32_32_64 + mov b32 $r14 $r12 + + /* check if there wasn't any overflow */ + cmpu b32 $r11 0 + bra e #ticks_from_us_quit + + /* Overflow! */ + clear b32 $r14 + +ticks_from_us_quit: + pop $r11 + pop $r12 + ret + +// calculate the number of ticks in the specified microsecond delay // // $r15 - current // $r14 - ticks +// $r14 - us (return) +// $r0 - zero +ticks_to_us: + /* simply divide $ticks by HW_TICKS_PER_US */ + imm32($r13, HW_TICKS_PER_US) + div $r14 $r14 $r13 + + ret + +// request the current process be sent a message after a timeout expires +// +// $r15 - current +// $r14 - ticks (make sure it is < 2^31 to avoid any possible overflow) // $r0 - zero timer: + push $r9 + push $r8 + // interrupts off to prevent racing with timer isr bclr $flags ie0 @@ -255,13 +340,22 @@ timer: ld b32 $r8 D[$r15 + #proc_time] cmp b32 $r8 0 bra g #timer_done - st b32 D[$r15 + #proc_time] $r14 - // halt watchdog timer temporarily and check for a pending - // interrupt. if there's one already pending, we can just - // bail since the timer isr will queue the next soonest - // right after it's done + // halt watchdog timer temporarily + clear b32 $r8 nv_iowr(NV_PPWR_WATCHDOG_ENABLE, $r8) + + // find out how much time elapsed since the last update + // of the watchdog and add this time to the wanted ticks + nv_iord($r8, NV_PPWR_WATCHDOG_TIME) + ld b32 $r9 D[$r0 + #time_prev] + sub b32 $r9 $r8 + add b32 $r14 $r9 + st b32 D[$r15 + #proc_time] $r14 + + // check for a pending interrupt. if there's one already + // pending, we can just bail since the timer isr will + // queue the next soonest right after it's done nv_iord($r8, NV_PPWR_INTR) and $r8 NV_PPWR_INTR_WATCHDOG bra nz #timer_enable @@ -272,10 +366,10 @@ timer: cmp b32 $r14 $r0 bra e #timer_reset cmp b32 $r14 $r8 - bra l #timer_done - timer_reset: - nv_iowr(NV_PPWR_WATCHDOG_TIME, $r14) - st b32 D[$r0 + #time_prev] $r14 + bra g #timer_enable + timer_reset: + nv_iowr(NV_PPWR_WATCHDOG_TIME, $r14) + st b32 D[$r0 + #time_prev] $r14 // re-enable the watchdog timer timer_enable: @@ -285,6 +379,9 @@ timer: // interrupts back on timer_done: bset $flags ie0 + + pop $r8 + pop $r9 ret // send message to another process @@ -371,6 +468,9 @@ send: // $r14 - process // $r0 - zero recv: + push $r9 + push $r8 + ld b32 $r8 D[$r14 + #proc_qget] ld b32 $r9 D[$r14 + #proc_qput] bclr $flags $p1 @@ -403,6 +503,8 @@ recv: bset $flags $p1 pop $r15 recv_done: + pop $r8 + pop $r9 ret init: |