OMAPL138如何在Linux下使用EDMA3驱动 - 嵌入式开发者社区

[code]EDMA sample test application. r+ Z/ |3 u8 N8 J# Y( `" W& |& ?
/*
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* edma_test.c" l1 _9 s( B9 P# C9 y
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* brief EDMA3 Test Application9 g& z" I& F/ o4 s
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* This file contains EDMA3 Test code.
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* NOTE: THIS FILE IS PROVIDED ONLY FOR INITIAL DEMO RELEASE AND MAY BE! T3 S" M2 w( n! D. m0 l+ H! `
* REMOVED AFTER THE DEMO OR THE CONTENTS OF THIS FILE ARE SUBJECT
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* TO CHANGE.
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*
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* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as1 O8 M5 H0 {6 c8 \: n
* published by the Free Software Foundation version 2.; b) k) E' p% v! o1 Y
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any. ]7 c( _/ e( ~* [8 c! _
* kind, whether express or implied; without even the implied warranty7 T! q( a- `% U/ a+ i
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the. c* x J0 ?$ k9 G+ O( O
* GNU General Public License for more details.
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*/
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#include <linux/module.h>! g9 P) t$ k" o
#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#include <linux/moduleparam.h>
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#include <linux/sysctl.h>
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#include <linux/mm.h>
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#include <linux/dma-mapping.h>8 w1 B6 h5 T! e+ ^' N
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#include <mach/memory.h>
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#include <mach/hardware.h>
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#include <mach/irqs.h>, K: |$ e) Q8 C* ]1 b4 S
#include <asm/hardware/edma.h># q. j1 p8 g* V% u, `
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#undef EDMA3_DEBUG
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/*#define EDMA3_DEBUG*/, S( [% J# `" X
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#ifdef EDMA3_DEBUG, P) w1 S# i& D
#define DMA_PRINTK(ARGS...) printk(KERN_INFO "<%s>: ",__FUNCTION__);printk(ARGS)2 A0 k$ {4 {1 r
#define DMA_FN_IN printk(KERN_INFO "[%s]: start\n", __FUNCTION__)- o: ?. {+ l. C
#define DMA_FN_OUT printk(KERN_INFO "[%s]: end\n",__FUNCTION__): K4 E+ V0 Q: A& t- r) \3 `
#else
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#define DMA_PRINTK( x... )
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#define DMA_FN_IN
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#define DMA_FN_OUT4 [+ ^( G+ g o# t) Z3 [
#endif1 q; v$ u3 P6 z
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#define MAX_DMA_TRANSFER_IN_BYTES (32768)
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#define STATIC_SHIFT 34 P8 X3 o4 t- q7 M' h
#define TCINTEN_SHIFT 20
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#define ITCINTEN_SHIFT 21% N# A8 Q& I9 S2 \
#define TCCHEN_SHIFT 22% ~/ a% `" e0 a; f3 v* E b
#define ITCCHEN_SHIFT 23# t2 I \8 E* E# a
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static volatile int irqraised1 = 0;* C! }$ \! i _& L( h5 p: W9 X) p4 H1 w
static volatile int irqraised2 = 0;
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int edma3_memtomemcpytest_dma(int acnt, int bcnt, int ccnt, int sync_mode, int event_queue);
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int edma3_memtomemcpytest_dma_link(int acnt, int bcnt, int ccnt, int sync_mode, int event_queue);' \% D- X3 Q- W4 x
int edma3_memtomemcpytest_dma_chain(int acnt, int bcnt, int ccnt, int sync_mode, int event_queue);. d4 k3 k" u7 d7 B9 ^
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dma_addr_t dmaphyssrc1 = 0;, U' o9 z! P) u# A
dma_addr_t dmaphyssrc2 = 0;# c. Z3 N. Z' P9 q. J
dma_addr_t dmaphysdest1 = 0;
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dma_addr_t dmaphysdest2 = 0;! Q. b+ s1 G! E7 h, Q
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char *dmabufsrc1 = NULL;5 J y5 G Q; N5 l
char *dmabufsrc2 = NULL;$ V- M K9 S$ o# w8 C+ }
char *dmabufdest1 = NULL;% A" A$ j3 A8 y9 |( ]0 |
char *dmabufdest2 = NULL;
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static int acnt = 512;/ W4 I' l2 H0 R5 q
static int bcnt = 8;
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static int ccnt = 8;
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module_param(acnt, int, S_IRUGO);
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module_param(bcnt, int, S_IRUGO);
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module_param(ccnt, int, S_IRUGO);

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