diff options
Diffstat (limited to 'lib_blackfin')
| -rw-r--r-- | lib_blackfin/Makefile | 2 | ||||
| -rw-r--r-- | lib_blackfin/ins.S | 117 | ||||
| -rw-r--r-- | lib_blackfin/outs.S | 60 |
3 files changed, 179 insertions, 0 deletions
diff --git a/lib_blackfin/Makefile b/lib_blackfin/Makefile index cbf47f0..eebb131 100644 --- a/lib_blackfin/Makefile +++ b/lib_blackfin/Makefile @@ -31,10 +31,12 @@ CFLAGS += -DBFIN_BOARD_NAME='"$(BOARD)"' LIB = $(obj)lib$(ARCH).a +SOBJS-y += ins.o SOBJS-y += memcmp.o SOBJS-y += memcpy.o SOBJS-y += memmove.o SOBJS-y += memset.o +SOBJS-y += outs.o COBJS-y += board.o COBJS-y += boot.o diff --git a/lib_blackfin/ins.S b/lib_blackfin/ins.S new file mode 100644 index 0000000..4519596 --- /dev/null +++ b/lib_blackfin/ins.S @@ -0,0 +1,117 @@ +/* + * arch/blackfin/lib/ins.S - ins{bwl} using hardware loops + * + * Copyright 2004-2008 Analog Devices Inc. + * Copyright (C) 2005 Bas Vermeulen, BuyWays BV <bas@buyways.nl> + * Licensed under the GPL-2 or later. + */ + +#include <asm/blackfin.h> + +.align 2 + +#ifdef CONFIG_IPIPE +# define DO_CLI \ + [--sp] = rets; \ + [--sp] = (P5:0); \ + sp += -12; \ + call ___ipipe_disable_root_irqs_hw; \ + sp += 12; \ + (P5:0) = [sp++]; +# define CLI_INNER_NOP +#else +# define DO_CLI cli R3; +# define CLI_INNER_NOP nop; nop; nop; +#endif + +#ifdef CONFIG_IPIPE +# define DO_STI \ + sp += -12; \ + call ___ipipe_enable_root_irqs_hw; \ + sp += 12; \ +2: rets = [sp++]; +#else +# define DO_STI 2: sti R3; +#endif + +#ifdef CONFIG_BFIN_INS_LOWOVERHEAD +# define CLI_OUTER DO_CLI; +# define STI_OUTER DO_STI; +# define CLI_INNER 1: +# if ANOMALY_05000416 +# define STI_INNER nop; 2: nop; +# else +# define STI_INNER 2: +# endif +#else +# define CLI_OUTER +# define STI_OUTER +# define CLI_INNER 1: DO_CLI; CLI_INNER_NOP; +# define STI_INNER DO_STI; +#endif + +/* + * Reads on the Blackfin are speculative. In Blackfin terms, this means they + * can be interrupted at any time (even after they have been issued on to the + * external bus), and re-issued after the interrupt occurs. + * + * If a FIFO is sitting on the end of the read, it will see two reads, + * when the core only sees one. The FIFO receives the read which is cancelled, + * and not delivered to the core. + * + * To solve this, interrupts are turned off before reads occur to I/O space. + * There are 3 versions of all these functions + * - turns interrupts off every read (higher overhead, but lower latency) + * - turns interrupts off every loop (low overhead, but longer latency) + * - DMA version, which do not suffer from this issue. DMA versions have + * different name (prefixed by dma_ ), and are located in + * ../kernel/bfin_dma_5xx.c + * Using the dma related functions are recommended for transfering large + * buffers in/out of FIFOs. + */ + +#define COMMON_INS(func, ops) \ +ENTRY(_ins##func) \ + P0 = R0; /* P0 = port */ \ + CLI_OUTER; /* 3 instructions before first read access */ \ + P1 = R1; /* P1 = address */ \ + P2 = R2; /* P2 = count */ \ + SSYNC; \ + \ + LSETUP(1f, 2f) LC0 = P2; \ + CLI_INNER; \ + ops; \ + STI_INNER; \ + \ + STI_OUTER; \ + RTS; \ +ENDPROC(_ins##func) + +COMMON_INS(l, \ + R0 = [P0]; \ + [P1++] = R0; \ +) + +COMMON_INS(w, \ + R0 = W[P0]; \ + W[P1++] = R0; \ +) + +COMMON_INS(w_8, \ + R0 = W[P0]; \ + B[P1++] = R0; \ + R0 = R0 >> 8; \ + B[P1++] = R0; \ +) + +COMMON_INS(b, \ + R0 = B[P0]; \ + B[P1++] = R0; \ +) + +COMMON_INS(l_16, \ + R0 = [P0]; \ + W[P1++] = R0; \ + R0 = R0 >> 16; \ + W[P1++] = R0; \ +) diff --git a/lib_blackfin/outs.S b/lib_blackfin/outs.S new file mode 100644 index 0000000..90c6033 --- /dev/null +++ b/lib_blackfin/outs.S @@ -0,0 +1,60 @@ +/* + * 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 <asm/linkage.h> + +.align 2 + +ENTRY(_outsl) + 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; + RTS; +ENDPROC(_outsl) + +ENTRY(_outsw) + 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; + RTS; +ENDPROC(_outsw) + +ENTRY(_outsb) + 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; + RTS; +ENDPROC(_outsb) + +ENTRY(_outsw_8) + 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; + RTS; +ENDPROC(_outsw_8) |