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| author | Kumar Gala <galak@kernel.crashing.org> | 2008-09-22 14:11:10 -0500 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2008-10-18 21:54:04 +0200 |
| commit | 54e091d3b603a3332c619199ca83a07e95960da4 (patch) | |
| tree | d0bfa1b0ba3703150b2a368abb861dafa9cd0bb8 /cpu/mpc85xx | |
| parent | 6250f0f6297c5ba9aecdea6290799a95c5d4b1da (diff) | |
| download | blackbird-obmc-uboot-54e091d3b603a3332c619199ca83a07e95960da4.tar.gz blackbird-obmc-uboot-54e091d3b603a3332c619199ca83a07e95960da4.zip | |
85xx: Export invalidate_{i,d}cache and add flush_dcache
Added the ability for C code to invalidate the i/d-cache's and
to flush the d-cache. This allows us to more efficient change mappings
from cache-able to cache-inhibited.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'cpu/mpc85xx')
| -rw-r--r-- | cpu/mpc85xx/start.S | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/cpu/mpc85xx/start.S b/cpu/mpc85xx/start.S index 25d039056e..fc3c3368af 100644 --- a/cpu/mpc85xx/start.S +++ b/cpu/mpc85xx/start.S @@ -565,6 +565,7 @@ mck_return: /* Cache functions. */ +.globl invalidate_icache invalidate_icache: mfspr r0,L1CSR1 ori r0,r0,L1CSR1_ICFI @@ -574,6 +575,7 @@ invalidate_icache: isync blr /* entire I cache */ +.globl invalidate_dcache invalidate_dcache: mfspr r0,L1CSR0 ori r0,r0,L1CSR0_DCFI @@ -1019,3 +1021,50 @@ unlock_ram_in_cache: tlbivax 0,r3 isync blr + +.globl flush_dcache +flush_dcache: + mfspr r3,SPRN_L1CFG0 + + rlwinm r5,r3,9,3 /* Extract cache block size */ + twlgti r5,1 /* Only 32 and 64 byte cache blocks + * are currently defined. + */ + li r4,32 + subfic r6,r5,2 /* r6 = log2(1KiB / cache block size) - + * log2(number of ways) + */ + slw r5,r4,r5 /* r5 = cache block size */ + + rlwinm r7,r3,0,0xff /* Extract number of KiB in the cache */ + mulli r7,r7,13 /* An 8-way cache will require 13 + * loads per set. + */ + slw r7,r7,r6 + + /* save off HID0 and set DCFA */ + mfspr r8,SPRN_HID0 + ori r9,r8,HID0_DCFA@l + mtspr SPRN_HID0,r9 + isync + + lis r4,0 + mtctr r7 + +1: lwz r3,0(r4) /* Load... */ + add r4,r4,r5 + bdnz 1b + + msync + lis r4,0 + mtctr r7 + +1: dcbf 0,r4 /* ...and flush. */ + add r4,r4,r5 + bdnz 1b + + /* restore HID0 */ + mtspr SPRN_HID0,r8 + isync + + blr |
