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| author | Mike Frysinger <vapier@gentoo.org> | 2011-06-27 21:46:40 +0200 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2011-07-23 07:18:31 +0200 |
| commit | 9e770f77801fce713f5736c66f8441467eb36db5 (patch) | |
| tree | 38b0a8bd9da5ce486f102bcefe95261cb81877fe /arch/blackfin | |
| parent | Blackfin: dpmc: don't save/restore scratch registers (diff) | |
| download | linux-9e770f77801fce713f5736c66f8441467eb36db5.tar.xz linux-9e770f77801fce713f5736c66f8441467eb36db5.zip | |
Blackfin: dpmc: optimize SDRAM programming slightly
No need to reload these registers constantly since they're always
available (we're not making any function calls in between).
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin')
| -rw-r--r-- | arch/blackfin/mach-common/dpmc_modes.S | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/arch/blackfin/mach-common/dpmc_modes.S b/arch/blackfin/mach-common/dpmc_modes.S index 2d1c3ce19fb1..1c534d298de4 100644 --- a/arch/blackfin/mach-common/dpmc_modes.S +++ b/arch/blackfin/mach-common/dpmc_modes.S @@ -196,21 +196,20 @@ ENTRY(_set_dram_srfs) #else /* SDRAM */ P0.L = lo(EBIU_SDGCTL); P0.H = hi(EBIU_SDGCTL); + P1.L = lo(EBIU_SDSTAT); + P1.H = hi(EBIU_SDSTAT); + R2 = [P0]; BITSET(R2, 24); /* SRFS enter self-refresh mode */ [P0] = R2; SSYNC; - P0.L = lo(EBIU_SDSTAT); - P0.H = hi(EBIU_SDSTAT); 1: - R2 = w[P0]; + R2 = w[P1]; SSYNC; cc = BITTST(R2, 1); /* SDSRA poll self-refresh status */ if !cc jump 1b; - P0.L = lo(EBIU_SDGCTL); - P0.H = hi(EBIU_SDGCTL); R2 = [P0]; BITCLR(R2, 0); /* SCTLE disable CLKOUT */ [P0] = R2; @@ -220,6 +219,7 @@ ENDPROC(_set_dram_srfs) ENTRY(_unset_dram_srfs) /* set the dram out of self refresh mode */ + #if defined(EBIU_RSTCTL) /* DDR */ P0.H = hi(EBIU_RSTCTL); P0.L = lo(EBIU_RSTCTL); @@ -227,20 +227,21 @@ ENTRY(_unset_dram_srfs) BITCLR(R2, 3); /* clear SRREQ bit */ [P0] = R2; #elif defined(EBIU_SDGCTL) /* SDRAM */ - - P0.L = lo(EBIU_SDGCTL); /* release CLKOUT from self-refresh */ + /* release CLKOUT from self-refresh */ + P0.L = lo(EBIU_SDGCTL); P0.H = hi(EBIU_SDGCTL); + R2 = [P0]; BITSET(R2, 0); /* SCTLE enable CLKOUT */ [P0] = R2 SSYNC; - P0.L = lo(EBIU_SDGCTL); /* release SDRAM from self-refresh */ - P0.H = hi(EBIU_SDGCTL); + /* release SDRAM from self-refresh */ R2 = [P0]; BITCLR(R2, 24); /* clear SRFS bit */ [P0] = R2 #endif + SSYNC; RTS; ENDPROC(_unset_dram_srfs) |