OMAPL138如何在Linux下使用EDMA3驱动 - 嵌入式开发者社区

[code]EDMA sample test application
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/*
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* edma_test.c
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* brief EDMA3 Test Application; D! v5 A- S' ]) v$ R: \! c& Q
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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
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* 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/or8 w: ]' W b* u2 W, V
* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.: P/ M$ [9 m" k
*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any+ \$ G6 H8 d, B( t# w: T0 _
* kind, whether express or implied; without even the implied warranty9 Z% o- A2 F$ [3 N/ R' E+ Z
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>; |. B9 g3 O6 c7 b
#include <linux/init.h>5 Q0 i9 y# p/ _$ k3 p
#include <linux/errno.h>7 n, s& ]) N9 F' S0 L
#include <linux/types.h>5 X! y$ e. j8 E: E( k
#include <linux/interrupt.h>9 m6 S+ K! X2 J L3 l( L7 h
#include <asm/io.h>. J, G$ x" I& p9 A+ C" k6 X8 `7 [
#include <linux/moduleparam.h>' U% |6 y1 ~2 _
#include <linux/sysctl.h>6 o K8 p: ~% l9 u1 @, I. F
#include <linux/mm.h>
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#include <linux/dma-mapping.h>
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#include <mach/memory.h>
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#include <mach/hardware.h>( x* A1 A E1 q
#include <mach/irqs.h>
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#include <asm/hardware/edma.h>
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#undef EDMA3_DEBUG
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/*#define EDMA3_DEBUG*/$ G- C0 K3 ]( C3 f6 W
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#ifdef EDMA3_DEBUG/ V$ ~& M M2 I4 v# p Z2 ]# f) B
#define DMA_PRINTK(ARGS...) printk(KERN_INFO "<%s>: ",__FUNCTION__);printk(ARGS)8 |' o5 C+ }+ H2 [
#define DMA_FN_IN printk(KERN_INFO "[%s]: start\n", __FUNCTION__)
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#define DMA_FN_OUT printk(KERN_INFO "[%s]: end\n",__FUNCTION__)
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#else) ^7 S# O+ Z2 r/ P
#define DMA_PRINTK( x... )0 l( V! U% J. |" }1 V/ r
#define DMA_FN_IN
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#define DMA_FN_OUT
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#endif
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#define MAX_DMA_TRANSFER_IN_BYTES (32768)
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#define STATIC_SHIFT 3) X& }+ ]9 k- ]2 I/ g- W% z
#define TCINTEN_SHIFT 207 U' _- L! A! T' O. x" q# m; ]
#define ITCINTEN_SHIFT 213 N! R$ C2 F5 R' e7 N* ^' r. S
#define TCCHEN_SHIFT 22
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#define ITCCHEN_SHIFT 23
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static volatile int irqraised1 = 0;* ]4 j4 B# v! A! K
static volatile int irqraised2 = 0;0 f. i2 v6 E- T: H9 G$ T
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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);
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int edma3_memtomemcpytest_dma_chain(int acnt, int bcnt, int ccnt, int sync_mode, int event_queue);
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dma_addr_t dmaphyssrc1 = 0;
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dma_addr_t dmaphyssrc2 = 0;
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dma_addr_t dmaphysdest1 = 0;
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dma_addr_t dmaphysdest2 = 0;( c5 i/ l+ Z& w4 S
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char *dmabufsrc1 = NULL;7 h% k; s4 a; |$ A" h, P x
char *dmabufsrc2 = NULL;' ?; f7 N* ]% U3 F0 h& W) T% N
char *dmabufdest1 = NULL;; q, X: r# Y( W+ \% s6 h" \
char *dmabufdest2 = NULL;. B8 k8 [% R6 X
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static int acnt = 512;* D' e( q8 ]/ t- R- r, \6 J6 @- }
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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