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Diffstat (limited to 'arch/blackfin/lib/ins.S')
| -rw-r--r-- | arch/blackfin/lib/ins.S | 118 |
1 files changed, 0 insertions, 118 deletions
diff --git a/arch/blackfin/lib/ins.S b/arch/blackfin/lib/ins.S deleted file mode 100644 index d59608deccc1..000000000000 --- a/arch/blackfin/lib/ins.S +++ /dev/null @@ -1,118 +0,0 @@ -/* - * 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 <linux/linkage.h> -#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.c - * Using the dma related functions are recommended for transferring 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; \ -) |