diff options
Diffstat (limited to 'kernel/arch/blackfin/lib/outs.S')
| -rw-r--r-- | kernel/arch/blackfin/lib/outs.S | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/kernel/arch/blackfin/lib/outs.S b/kernel/arch/blackfin/lib/outs.S new file mode 100644 index 000000000..06a5e6744 --- /dev/null +++ b/kernel/arch/blackfin/lib/outs.S @@ -0,0 +1,68 @@ +/* + * Implementation of outs{bwl} for BlackFin processors using zero overhead loops. + * + * Copyright 2005-2009 Analog Devices Inc. + * 2005 BuyWays BV + * Bas Vermeulen <bas@buyways.nl> + * + * Licensed under the GPL-2. + */ + +#include <linux/linkage.h> + +.align 2 + +ENTRY(_outsl) + CC = R2 == 0; + IF CC JUMP 1f; + P0 = R0; /* P0 = port */ + P1 = R1; /* P1 = address */ + P2 = R2; /* P2 = count */ + + LSETUP( .Llong_loop_s, .Llong_loop_e) LC0 = P2; +.Llong_loop_s: R0 = [P1++]; +.Llong_loop_e: [P0] = R0; +1: RTS; +ENDPROC(_outsl) + +ENTRY(_outsw) + CC = R2 == 0; + IF CC JUMP 1f; + P0 = R0; /* P0 = port */ + P1 = R1; /* P1 = address */ + P2 = R2; /* P2 = count */ + + LSETUP( .Lword_loop_s, .Lword_loop_e) LC0 = P2; +.Lword_loop_s: R0 = W[P1++]; +.Lword_loop_e: W[P0] = R0; +1: RTS; +ENDPROC(_outsw) + +ENTRY(_outsb) + CC = R2 == 0; + IF CC JUMP 1f; + P0 = R0; /* P0 = port */ + P1 = R1; /* P1 = address */ + P2 = R2; /* P2 = count */ + + LSETUP( .Lbyte_loop_s, .Lbyte_loop_e) LC0 = P2; +.Lbyte_loop_s: R0 = B[P1++]; +.Lbyte_loop_e: B[P0] = R0; +1: RTS; +ENDPROC(_outsb) + +ENTRY(_outsw_8) + CC = R2 == 0; + IF CC JUMP 1f; + P0 = R0; /* P0 = port */ + P1 = R1; /* P1 = address */ + P2 = R2; /* P2 = count */ + + LSETUP( .Lword8_loop_s, .Lword8_loop_e) LC0 = P2; +.Lword8_loop_s: R1 = B[P1++]; + R0 = B[P1++]; + R0 = R0 << 8; + R0 = R0 + R1; +.Lword8_loop_e: W[P0] = R0; +1: RTS; +ENDPROC(_outsw_8) |