ARCv2: mm: Merge 2 updates to DC_CTRL for region flush
Region Flush has a weird programming model.
1. Flush or Invalidate is selected by DC_CTRL.RGN_OP
2 Flush-n-Invalidate is done by DC_CTRL.IM
Given the code structuring before, case #2 above was generating two
seperate updates to DC_CTRL which was pointless.
| 80a342b0 <__dma_cache_wback_inv_l1>:
| 80a342b0: clri r4
| 80a342b4: lr r2,[dc_ctrl]
| 80a342b8: bset_s r2,r2,0x6
| 80a342ba: sr r2,[dc_ctrl] <-- FIRST
|
| 80a342be: bmskn r3,r0,0x5
|
| 80a342c2: lr r2,[dc_ctrl]
| 80a342c6: and r2,r2,0xfffff1ff
| 80a342ce: bset_s r2,r2,0x9
| 80a342d0: sr r2,[dc_ctrl] <-- SECOND
|
| 80a342d4: add_s r1,r1,0x3f
| 80a342d6: bmsk_s r0,r0,0x5
| 80a342d8: add_s r0,r0,r1
| 80a342da: add_s r0,r0,r3
| 80a342dc: sr r0,[78]
| 80a342e0: sr r3,[77]
|...
|...
So move setting of DC_CTRL.RGN_OP into __before_dc_op() and combine with
any other update.
| 80b63324 <__dma_cache_wback_inv_l1>:
| 80b63324: clri r3
| 80b63328: lr r2,[dc_ctrl]
| 80b6332c: and r2,r2,0xfffff1ff
| 80b63334: or r2,r2,576
| 80b63338: sr r2,[dc_ctrl]
|
| 80b6333c: add_s r1,r1,0x3f
| 80b6333e: bmskn r2,r0,0x5
| 80b63342: add_s r0,r0,r1
| 80b63344: sr r0,[78]
| 80b63348: sr r2,[77]
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
1 file changed