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b9c7eb498d
__ipipe_{stall, unstall}_root_raw() identifiers may leave the reader
under the impression that only the virtual state is affected by these
operations, which is wrong. Pick names following the convention used
throughout the interrupt pipeline code.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
119 lines
2.6 KiB
ArmAsm
119 lines
2.6 KiB
ArmAsm
/*
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* arch/blackfin/lib/ins.S - ins{bwl} using hardware loops
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*
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* Copyright 2004-2008 Analog Devices Inc.
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* Copyright (C) 2005 Bas Vermeulen, BuyWays BV <bas@buyways.nl>
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/linkage.h>
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#include <asm/blackfin.h>
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.align 2
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#ifdef CONFIG_IPIPE
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# define DO_CLI \
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[--sp] = rets; \
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[--sp] = (P5:0); \
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sp += -12; \
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call ___ipipe_disable_root_irqs_hw; \
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sp += 12; \
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(P5:0) = [sp++];
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# define CLI_INNER_NOP
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#else
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# define DO_CLI cli R3;
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# define CLI_INNER_NOP nop; nop; nop;
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#endif
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#ifdef CONFIG_IPIPE
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# define DO_STI \
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sp += -12; \
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call ___ipipe_enable_root_irqs_hw; \
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sp += 12; \
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2: rets = [sp++];
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#else
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# define DO_STI 2: sti R3;
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#endif
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#ifdef CONFIG_BFIN_INS_LOWOVERHEAD
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# define CLI_OUTER DO_CLI;
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# define STI_OUTER DO_STI;
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# define CLI_INNER 1:
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# if ANOMALY_05000416
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# define STI_INNER nop; 2: nop;
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# else
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# define STI_INNER 2:
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# endif
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#else
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# define CLI_OUTER
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# define STI_OUTER
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# define CLI_INNER 1: DO_CLI; CLI_INNER_NOP;
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# define STI_INNER DO_STI;
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#endif
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/*
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* Reads on the Blackfin are speculative. In Blackfin terms, this means they
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* can be interrupted at any time (even after they have been issued on to the
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* external bus), and re-issued after the interrupt occurs.
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*
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* If a FIFO is sitting on the end of the read, it will see two reads,
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* when the core only sees one. The FIFO receives the read which is cancelled,
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* and not delivered to the core.
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*
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* To solve this, interrupts are turned off before reads occur to I/O space.
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* There are 3 versions of all these functions
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* - turns interrupts off every read (higher overhead, but lower latency)
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* - turns interrupts off every loop (low overhead, but longer latency)
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* - DMA version, which do not suffer from this issue. DMA versions have
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* different name (prefixed by dma_ ), and are located in
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* ../kernel/bfin_dma_5xx.c
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* Using the dma related functions are recommended for transfering large
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* buffers in/out of FIFOs.
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*/
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#define COMMON_INS(func, ops) \
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ENTRY(_ins##func) \
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P0 = R0; /* P0 = port */ \
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CLI_OUTER; /* 3 instructions before first read access */ \
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P1 = R1; /* P1 = address */ \
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P2 = R2; /* P2 = count */ \
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SSYNC; \
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\
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LSETUP(1f, 2f) LC0 = P2; \
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CLI_INNER; \
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ops; \
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STI_INNER; \
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\
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STI_OUTER; \
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RTS; \
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ENDPROC(_ins##func)
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COMMON_INS(l, \
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R0 = [P0]; \
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[P1++] = R0; \
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)
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COMMON_INS(w, \
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R0 = W[P0]; \
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W[P1++] = R0; \
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)
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COMMON_INS(w_8, \
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R0 = W[P0]; \
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B[P1++] = R0; \
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R0 = R0 >> 8; \
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B[P1++] = R0; \
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)
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COMMON_INS(b, \
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R0 = B[P0]; \
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B[P1++] = R0; \
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)
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COMMON_INS(l_16, \
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R0 = [P0]; \
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W[P1++] = R0; \
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R0 = R0 >> 16; \
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W[P1++] = R0; \
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)
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