2005-04-17 00:20:36 +02:00
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/*
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* include/asm-ppc/ppc4xx_dma.h
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*
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* IBM PPC4xx DMA engine library
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*
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* Copyright 2000-2004 MontaVista Software Inc.
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*
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* Cleaned up a bit more, Matt Porter <mporter@kernel.crashing.org>
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*
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* Original code by Armin Kuster <akuster@mvista.com>
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* and Pete Popov <ppopov@mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifdef __KERNEL__
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#ifndef __ASMPPC_PPC4xx_DMA_H
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#define __ASMPPC_PPC4xx_DMA_H
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#include <linux/types.h>
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#include <asm/mmu.h>
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#include <asm/ibm4xx.h>
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#undef DEBUG_4xxDMA
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#define MAX_PPC4xx_DMA_CHANNELS 4
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/*
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* Function return status codes
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* These values are used to indicate whether or not the function
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* call was successful, or a bad/invalid parameter was passed.
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*/
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#define DMA_STATUS_GOOD 0
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#define DMA_STATUS_BAD_CHANNEL 1
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#define DMA_STATUS_BAD_HANDLE 2
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#define DMA_STATUS_BAD_MODE 3
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#define DMA_STATUS_NULL_POINTER 4
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#define DMA_STATUS_OUT_OF_MEMORY 5
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#define DMA_STATUS_SGL_LIST_EMPTY 6
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#define DMA_STATUS_GENERAL_ERROR 7
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#define DMA_STATUS_CHANNEL_NOTFREE 8
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#define DMA_CHANNEL_BUSY 0x80000000
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/*
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* These indicate status as returned from the DMA Status Register.
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*/
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#define DMA_STATUS_NO_ERROR 0
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#define DMA_STATUS_CS 1 /* Count Status */
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#define DMA_STATUS_TS 2 /* Transfer Status */
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#define DMA_STATUS_DMA_ERROR 3 /* DMA Error Occurred */
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#define DMA_STATUS_DMA_BUSY 4 /* The channel is busy */
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/*
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* DMA Channel Control Registers
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*/
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#ifdef CONFIG_44x
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#define PPC4xx_DMA_64BIT
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#define DMA_CR_OFFSET 1
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#else
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#define DMA_CR_OFFSET 0
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#endif
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#define DMA_CE_ENABLE (1<<31) /* DMA Channel Enable */
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#define SET_DMA_CE_ENABLE(x) (((x)&0x1)<<31)
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#define GET_DMA_CE_ENABLE(x) (((x)&DMA_CE_ENABLE)>>31)
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#define DMA_CIE_ENABLE (1<<30) /* DMA Channel Interrupt Enable */
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#define SET_DMA_CIE_ENABLE(x) (((x)&0x1)<<30)
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#define GET_DMA_CIE_ENABLE(x) (((x)&DMA_CIE_ENABLE)>>30)
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#define DMA_TD (1<<29)
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#define SET_DMA_TD(x) (((x)&0x1)<<29)
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#define GET_DMA_TD(x) (((x)&DMA_TD)>>29)
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#define DMA_PL (1<<28) /* Peripheral Location */
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#define SET_DMA_PL(x) (((x)&0x1)<<28)
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#define GET_DMA_PL(x) (((x)&DMA_PL)>>28)
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#define EXTERNAL_PERIPHERAL 0
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#define INTERNAL_PERIPHERAL 1
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#define SET_DMA_PW(x) (((x)&0x3)<<(26-DMA_CR_OFFSET)) /* Peripheral Width */
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#define DMA_PW_MASK SET_DMA_PW(3)
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#define PW_8 0
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#define PW_16 1
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#define PW_32 2
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#define PW_64 3
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/* FIXME: Add PW_128 support for 440GP DMA block */
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#define GET_DMA_PW(x) (((x)&DMA_PW_MASK)>>(26-DMA_CR_OFFSET))
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#define DMA_DAI (1<<(25-DMA_CR_OFFSET)) /* Destination Address Increment */
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#define SET_DMA_DAI(x) (((x)&0x1)<<(25-DMA_CR_OFFSET))
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#define DMA_SAI (1<<(24-DMA_CR_OFFSET)) /* Source Address Increment */
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#define SET_DMA_SAI(x) (((x)&0x1)<<(24-DMA_CR_OFFSET))
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#define DMA_BEN (1<<(23-DMA_CR_OFFSET)) /* Buffer Enable */
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#define SET_DMA_BEN(x) (((x)&0x1)<<(23-DMA_CR_OFFSET))
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#define SET_DMA_TM(x) (((x)&0x3)<<(21-DMA_CR_OFFSET)) /* Transfer Mode */
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#define DMA_TM_MASK SET_DMA_TM(3)
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#define TM_PERIPHERAL 0 /* Peripheral */
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#define TM_RESERVED 1 /* Reserved */
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#define TM_S_MM 2 /* Memory to Memory */
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#define TM_D_MM 3 /* Device Paced Memory to Memory */
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#define GET_DMA_TM(x) (((x)&DMA_TM_MASK)>>(21-DMA_CR_OFFSET))
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#define SET_DMA_PSC(x) (((x)&0x3)<<(19-DMA_CR_OFFSET)) /* Peripheral Setup Cycles */
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#define DMA_PSC_MASK SET_DMA_PSC(3)
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#define GET_DMA_PSC(x) (((x)&DMA_PSC_MASK)>>(19-DMA_CR_OFFSET))
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#define SET_DMA_PWC(x) (((x)&0x3F)<<(13-DMA_CR_OFFSET)) /* Peripheral Wait Cycles */
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#define DMA_PWC_MASK SET_DMA_PWC(0x3F)
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#define GET_DMA_PWC(x) (((x)&DMA_PWC_MASK)>>(13-DMA_CR_OFFSET))
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#define SET_DMA_PHC(x) (((x)&0x7)<<(10-DMA_CR_OFFSET)) /* Peripheral Hold Cycles */
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#define DMA_PHC_MASK SET_DMA_PHC(0x7)
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#define GET_DMA_PHC(x) (((x)&DMA_PHC_MASK)>>(10-DMA_CR_OFFSET))
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#define DMA_ETD_OUTPUT (1<<(9-DMA_CR_OFFSET)) /* EOT pin is a TC output */
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#define SET_DMA_ETD(x) (((x)&0x1)<<(9-DMA_CR_OFFSET))
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#define DMA_TCE_ENABLE (1<<(8-DMA_CR_OFFSET))
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#define SET_DMA_TCE(x) (((x)&0x1)<<(8-DMA_CR_OFFSET))
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#define DMA_DEC (1<<(2)) /* Address Decrement */
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#define SET_DMA_DEC(x) (((x)&0x1)<<2)
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#define GET_DMA_DEC(x) (((x)&DMA_DEC)>>2)
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/*
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* Transfer Modes
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* These modes are defined in a way that makes it possible to
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* simply "or" in the value in the control register.
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*/
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#define DMA_MODE_MM (SET_DMA_TM(TM_S_MM)) /* memory to memory */
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/* Device-paced memory to memory, */
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/* device is at source address */
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#define DMA_MODE_MM_DEVATSRC (DMA_TD | SET_DMA_TM(TM_D_MM))
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/* Device-paced memory to memory, */
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/* device is at destination address */
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#define DMA_MODE_MM_DEVATDST (SET_DMA_TM(TM_D_MM))
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/* 405gp/440gp */
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#define SET_DMA_PREFETCH(x) (((x)&0x3)<<(4-DMA_CR_OFFSET)) /* Memory Read Prefetch */
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#define DMA_PREFETCH_MASK SET_DMA_PREFETCH(3)
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#define PREFETCH_1 0 /* Prefetch 1 Double Word */
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#define PREFETCH_2 1
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#define PREFETCH_4 2
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#define GET_DMA_PREFETCH(x) (((x)&DMA_PREFETCH_MASK)>>(4-DMA_CR_OFFSET))
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#define DMA_PCE (1<<(3-DMA_CR_OFFSET)) /* Parity Check Enable */
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#define SET_DMA_PCE(x) (((x)&0x1)<<(3-DMA_CR_OFFSET))
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#define GET_DMA_PCE(x) (((x)&DMA_PCE)>>(3-DMA_CR_OFFSET))
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/* stb3x */
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#define DMA_ECE_ENABLE (1<<5)
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#define SET_DMA_ECE(x) (((x)&0x1)<<5)
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#define GET_DMA_ECE(x) (((x)&DMA_ECE_ENABLE)>>5)
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#define DMA_TCD_DISABLE (1<<4)
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#define SET_DMA_TCD(x) (((x)&0x1)<<4)
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#define GET_DMA_TCD(x) (((x)&DMA_TCD_DISABLE)>>4)
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typedef uint32_t sgl_handle_t;
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#ifdef CONFIG_PPC4xx_EDMA
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#define SGL_LIST_SIZE 4096
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#define DMA_PPC4xx_SIZE SGL_LIST_SIZE
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#define SET_DMA_PRIORITY(x) (((x)&0x3)<<(6-DMA_CR_OFFSET)) /* DMA Channel Priority */
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#define DMA_PRIORITY_MASK SET_DMA_PRIORITY(3)
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#define PRIORITY_LOW 0
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#define PRIORITY_MID_LOW 1
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#define PRIORITY_MID_HIGH 2
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#define PRIORITY_HIGH 3
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#define GET_DMA_PRIORITY(x) (((x)&DMA_PRIORITY_MASK)>>(6-DMA_CR_OFFSET))
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/*
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* DMA Polarity Configuration Register
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*/
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#define DMAReq_ActiveLow(chan) (1<<(31-(chan*3)))
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#define DMAAck_ActiveLow(chan) (1<<(30-(chan*3)))
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#define EOT_ActiveLow(chan) (1<<(29-(chan*3))) /* End of Transfer */
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/*
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* DMA Sleep Mode Register
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*/
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#define SLEEP_MODE_ENABLE (1<<21)
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/*
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* DMA Status Register
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*/
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#define DMA_CS0 (1<<31) /* Terminal Count has been reached */
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#define DMA_CS1 (1<<30)
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#define DMA_CS2 (1<<29)
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#define DMA_CS3 (1<<28)
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#define DMA_TS0 (1<<27) /* End of Transfer has been requested */
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#define DMA_TS1 (1<<26)
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#define DMA_TS2 (1<<25)
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#define DMA_TS3 (1<<24)
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#define DMA_CH0_ERR (1<<23) /* DMA Chanel 0 Error */
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#define DMA_CH1_ERR (1<<22)
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#define DMA_CH2_ERR (1<<21)
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#define DMA_CH3_ERR (1<<20)
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#define DMA_IN_DMA_REQ0 (1<<19) /* Internal DMA Request is pending */
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#define DMA_IN_DMA_REQ1 (1<<18)
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#define DMA_IN_DMA_REQ2 (1<<17)
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#define DMA_IN_DMA_REQ3 (1<<16)
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#define DMA_EXT_DMA_REQ0 (1<<15) /* External DMA Request is pending */
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#define DMA_EXT_DMA_REQ1 (1<<14)
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#define DMA_EXT_DMA_REQ2 (1<<13)
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#define DMA_EXT_DMA_REQ3 (1<<12)
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#define DMA_CH0_BUSY (1<<11) /* DMA Channel 0 Busy */
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#define DMA_CH1_BUSY (1<<10)
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#define DMA_CH2_BUSY (1<<9)
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#define DMA_CH3_BUSY (1<<8)
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#define DMA_SG0 (1<<7) /* DMA Channel 0 Scatter/Gather in progress */
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#define DMA_SG1 (1<<6)
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#define DMA_SG2 (1<<5)
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#define DMA_SG3 (1<<4)
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/* DMA Channel Count Register */
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#define DMA_CTC_BTEN (1<<23) /* Burst Enable/Disable bit */
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#define DMA_CTC_BSIZ_MSK (3<<21) /* Mask of the Burst size bits */
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#define DMA_CTC_BSIZ_2 (0)
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#define DMA_CTC_BSIZ_4 (1<<21)
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#define DMA_CTC_BSIZ_8 (2<<21)
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#define DMA_CTC_BSIZ_16 (3<<21)
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/*
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* DMA SG Command Register
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*/
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#define SSG_ENABLE(chan) (1<<(31-chan)) /* Start Scatter Gather */
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#define SSG_MASK_ENABLE(chan) (1<<(15-chan)) /* Enable writing to SSG0 bit */
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/*
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* DMA Scatter/Gather Descriptor Bit fields
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*/
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#define SG_LINK (1<<31) /* Link */
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#define SG_TCI_ENABLE (1<<29) /* Enable Terminal Count Interrupt */
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#define SG_ETI_ENABLE (1<<28) /* Enable End of Transfer Interrupt */
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#define SG_ERI_ENABLE (1<<27) /* Enable Error Interrupt */
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#define SG_COUNT_MASK 0xFFFF /* Count Field */
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#define SET_DMA_CONTROL \
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(SET_DMA_CIE_ENABLE(p_init->int_enable) | /* interrupt enable */ \
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SET_DMA_BEN(p_init->buffer_enable) | /* buffer enable */\
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SET_DMA_ETD(p_init->etd_output) | /* end of transfer pin */ \
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SET_DMA_TCE(p_init->tce_enable) | /* terminal count enable */ \
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SET_DMA_PL(p_init->pl) | /* peripheral location */ \
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SET_DMA_DAI(p_init->dai) | /* dest addr increment */ \
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SET_DMA_SAI(p_init->sai) | /* src addr increment */ \
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SET_DMA_PRIORITY(p_init->cp) | /* channel priority */ \
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SET_DMA_PW(p_init->pwidth) | /* peripheral/bus width */ \
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SET_DMA_PSC(p_init->psc) | /* peripheral setup cycles */ \
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SET_DMA_PWC(p_init->pwc) | /* peripheral wait cycles */ \
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SET_DMA_PHC(p_init->phc) | /* peripheral hold cycles */ \
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SET_DMA_PREFETCH(p_init->pf) /* read prefetch */)
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#define GET_DMA_POLARITY(chan) (DMAReq_ActiveLow(chan) | DMAAck_ActiveLow(chan) | EOT_ActiveLow(chan))
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2005-08-18 20:24:25 +02:00
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#elif defined(CONFIG_STB03xxx) /* stb03xxx */
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2005-04-17 00:20:36 +02:00
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#define DMA_PPC4xx_SIZE 4096
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/*
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* DMA Status Register
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*/
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#define SET_DMA_PRIORITY(x) (((x)&0x00800001)) /* DMA Channel Priority */
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#define DMA_PRIORITY_MASK 0x00800001
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#define PRIORITY_LOW 0x00000000
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#define PRIORITY_MID_LOW 0x00000001
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#define PRIORITY_MID_HIGH 0x00800000
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#define PRIORITY_HIGH 0x00800001
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#define GET_DMA_PRIORITY(x) (((((x)&DMA_PRIORITY_MASK) &0x00800000) >> 22 ) | (((x)&DMA_PRIORITY_MASK) &0x00000001))
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#define DMA_CS0 (1<<31) /* Terminal Count has been reached */
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#define DMA_CS1 (1<<30)
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#define DMA_CS2 (1<<29)
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#define DMA_CS3 (1<<28)
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#define DMA_TS0 (1<<27) /* End of Transfer has been requested */
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#define DMA_TS1 (1<<26)
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#define DMA_TS2 (1<<25)
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#define DMA_TS3 (1<<24)
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#define DMA_CH0_ERR (1<<23) /* DMA Chanel 0 Error */
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#define DMA_CH1_ERR (1<<22)
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#define DMA_CH2_ERR (1<<21)
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#define DMA_CH3_ERR (1<<20)
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#define DMA_CT0 (1<<19) /* Chained transfere */
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#define DMA_IN_DMA_REQ0 (1<<18) /* Internal DMA Request is pending */
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#define DMA_IN_DMA_REQ1 (1<<17)
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#define DMA_IN_DMA_REQ2 (1<<16)
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#define DMA_IN_DMA_REQ3 (1<<15)
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#define DMA_EXT_DMA_REQ0 (1<<14) /* External DMA Request is pending */
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#define DMA_EXT_DMA_REQ1 (1<<13)
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#define DMA_EXT_DMA_REQ2 (1<<12)
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#define DMA_EXT_DMA_REQ3 (1<<11)
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#define DMA_CH0_BUSY (1<<10) /* DMA Channel 0 Busy */
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#define DMA_CH1_BUSY (1<<9)
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#define DMA_CH2_BUSY (1<<8)
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#define DMA_CH3_BUSY (1<<7)
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#define DMA_CT1 (1<<6) /* Chained transfere */
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#define DMA_CT2 (1<<5)
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#define DMA_CT3 (1<<4)
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#define DMA_CH_ENABLE (1<<7)
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#define SET_DMA_CH(x) (((x)&0x1)<<7)
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#define GET_DMA_CH(x) (((x)&DMA_CH_ENABLE)>>7)
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/* STBx25xxx dma unique */
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/* enable device port on a dma channel
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* example ext 0 on dma 1
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*/
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#define SSP0_RECV 15
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#define SSP0_XMIT 14
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#define EXT_DMA_0 12
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#define SC1_XMIT 11
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#define SC1_RECV 10
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#define EXT_DMA_2 9
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#define EXT_DMA_3 8
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#define SERIAL2_XMIT 7
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#define SERIAL2_RECV 6
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#define SC0_XMIT 5
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#define SC0_RECV 4
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#define SERIAL1_XMIT 3
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#define SERIAL1_RECV 2
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#define SERIAL0_XMIT 1
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#define SERIAL0_RECV 0
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#define DMA_CHAN_0 1
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#define DMA_CHAN_1 2
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#define DMA_CHAN_2 3
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#define DMA_CHAN_3 4
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/* end STBx25xx */
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/*
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* Bit 30 must be one for Redwoods, otherwise transfers may receive errors.
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*/
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#define DMA_CR_MB0 0x2
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#define SET_DMA_CONTROL \
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(SET_DMA_CIE_ENABLE(p_init->int_enable) | /* interrupt enable */ \
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SET_DMA_ETD(p_init->etd_output) | /* end of transfer pin */ \
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SET_DMA_TCE(p_init->tce_enable) | /* terminal count enable */ \
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SET_DMA_PL(p_init->pl) | /* peripheral location */ \
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SET_DMA_DAI(p_init->dai) | /* dest addr increment */ \
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SET_DMA_SAI(p_init->sai) | /* src addr increment */ \
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SET_DMA_PRIORITY(p_init->cp) | /* channel priority */ \
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SET_DMA_PW(p_init->pwidth) | /* peripheral/bus width */ \
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SET_DMA_PSC(p_init->psc) | /* peripheral setup cycles */ \
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SET_DMA_PWC(p_init->pwc) | /* peripheral wait cycles */ \
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SET_DMA_PHC(p_init->phc) | /* peripheral hold cycles */ \
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SET_DMA_TCD(p_init->tcd_disable) | /* TC chain mode disable */ \
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SET_DMA_ECE(p_init->ece_enable) | /* ECE chanin mode enable */ \
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SET_DMA_CH(p_init->ch_enable) | /* Chain enable */ \
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DMA_CR_MB0 /* must be one */)
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#define GET_DMA_POLARITY(chan) chan
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#endif
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typedef struct {
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unsigned short in_use; /* set when channel is being used, clr when
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* available.
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*/
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/*
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* Valid polarity settings:
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* DMAReq_ActiveLow(n)
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* DMAAck_ActiveLow(n)
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* EOT_ActiveLow(n)
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*
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* n is 0 to max dma chans
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*/
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unsigned int polarity;
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char buffer_enable; /* Boolean: buffer enable */
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char tce_enable; /* Boolean: terminal count enable */
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char etd_output; /* Boolean: eot pin is a tc output */
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char pce; /* Boolean: parity check enable */
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/*
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* Peripheral location:
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* INTERNAL_PERIPHERAL (UART0 on the 405GP)
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* EXTERNAL_PERIPHERAL
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*/
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char pl; /* internal/external peripheral */
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/*
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* Valid pwidth settings:
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* PW_8
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* PW_16
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* PW_32
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* PW_64
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*/
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unsigned int pwidth;
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char dai; /* Boolean: dst address increment */
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char sai; /* Boolean: src address increment */
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/*
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* Valid psc settings: 0-3
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*/
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unsigned int psc; /* Peripheral Setup Cycles */
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/*
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* Valid pwc settings:
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* 0-63
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*/
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unsigned int pwc; /* Peripheral Wait Cycles */
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/*
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* Valid phc settings:
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* 0-7
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*/
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unsigned int phc; /* Peripheral Hold Cycles */
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/*
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* Valid cp (channel priority) settings:
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* PRIORITY_LOW
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* PRIORITY_MID_LOW
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* PRIORITY_MID_HIGH
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* PRIORITY_HIGH
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*/
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unsigned int cp; /* channel priority */
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/*
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* Valid pf (memory read prefetch) settings:
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*
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* PREFETCH_1
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* PREFETCH_2
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* PREFETCH_4
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*/
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unsigned int pf; /* memory read prefetch */
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/*
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* Boolean: channel interrupt enable
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* NOTE: for sgl transfers, only the last descriptor will be setup to
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* interrupt.
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*/
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char int_enable;
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char shift; /* easy access to byte_count shift, based on */
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/* the width of the channel */
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uint32_t control; /* channel control word */
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/* These variabled are used ONLY in single dma transfers */
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unsigned int mode; /* transfer mode */
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phys_addr_t addr;
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char ce; /* channel enable */
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#ifdef CONFIG_STB03xxx
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char ch_enable;
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char tcd_disable;
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char ece_enable;
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char td; /* transfer direction */
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#endif
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char int_on_final_sg;/* for scatter/gather - only interrupt on last sg */
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} ppc_dma_ch_t;
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/*
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* PPC44x DMA implementations have a slightly different
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* descriptor layout. Probably moved about due to the
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* change to 64-bit addresses and link pointer. I don't
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* know why they didn't just leave control_count after
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* the dst_addr.
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*/
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#ifdef PPC4xx_DMA_64BIT
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typedef struct {
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uint32_t control;
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uint32_t control_count;
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phys_addr_t src_addr;
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phys_addr_t dst_addr;
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phys_addr_t next;
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} ppc_sgl_t;
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#else
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typedef struct {
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uint32_t control;
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phys_addr_t src_addr;
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phys_addr_t dst_addr;
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uint32_t control_count;
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uint32_t next;
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} ppc_sgl_t;
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#endif
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typedef struct {
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unsigned int dmanr;
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uint32_t control; /* channel ctrl word; loaded from each descrptr */
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uint32_t sgl_control; /* LK, TCI, ETI, and ERI bits in sgl descriptor */
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dma_addr_t dma_addr; /* dma (physical) address of this list */
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ppc_sgl_t *phead;
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dma_addr_t phead_dma;
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ppc_sgl_t *ptail;
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dma_addr_t ptail_dma;
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} sgl_list_info_t;
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typedef struct {
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phys_addr_t *src_addr;
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phys_addr_t *dst_addr;
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phys_addr_t dma_src_addr;
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phys_addr_t dma_dst_addr;
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} pci_alloc_desc_t;
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extern ppc_dma_ch_t dma_channels[];
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/*
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* The DMA API are in ppc4xx_dma.c and ppc4xx_sgdma.c
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*/
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extern int ppc4xx_init_dma_channel(unsigned int, ppc_dma_ch_t *);
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extern int ppc4xx_get_channel_config(unsigned int, ppc_dma_ch_t *);
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extern int ppc4xx_set_channel_priority(unsigned int, unsigned int);
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extern unsigned int ppc4xx_get_peripheral_width(unsigned int);
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extern void ppc4xx_set_sg_addr(int, phys_addr_t);
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extern int ppc4xx_add_dma_sgl(sgl_handle_t, phys_addr_t, phys_addr_t, unsigned int);
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extern void ppc4xx_enable_dma_sgl(sgl_handle_t);
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extern void ppc4xx_disable_dma_sgl(sgl_handle_t);
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extern int ppc4xx_get_dma_sgl_residue(sgl_handle_t, phys_addr_t *, phys_addr_t *);
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extern int ppc4xx_delete_dma_sgl_element(sgl_handle_t, phys_addr_t *, phys_addr_t *);
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extern int ppc4xx_alloc_dma_handle(sgl_handle_t *, unsigned int, unsigned int);
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extern void ppc4xx_free_dma_handle(sgl_handle_t);
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extern int ppc4xx_get_dma_status(void);
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extern int ppc4xx_enable_burst(unsigned int);
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extern int ppc4xx_disable_burst(unsigned int);
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extern int ppc4xx_set_burst_size(unsigned int, unsigned int);
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extern void ppc4xx_set_src_addr(int dmanr, phys_addr_t src_addr);
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extern void ppc4xx_set_dst_addr(int dmanr, phys_addr_t dst_addr);
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extern void ppc4xx_enable_dma(unsigned int dmanr);
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extern void ppc4xx_disable_dma(unsigned int dmanr);
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extern void ppc4xx_set_dma_count(unsigned int dmanr, unsigned int count);
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extern int ppc4xx_get_dma_residue(unsigned int dmanr);
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extern void ppc4xx_set_dma_addr2(unsigned int dmanr, phys_addr_t src_dma_addr,
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phys_addr_t dst_dma_addr);
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extern int ppc4xx_enable_dma_interrupt(unsigned int dmanr);
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extern int ppc4xx_disable_dma_interrupt(unsigned int dmanr);
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extern int ppc4xx_clr_dma_status(unsigned int dmanr);
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extern int ppc4xx_map_dma_port(unsigned int dmanr, unsigned int ocp_dma,short dma_chan);
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extern int ppc4xx_disable_dma_port(unsigned int dmanr, unsigned int ocp_dma,short dma_chan);
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extern int ppc4xx_set_dma_mode(unsigned int dmanr, unsigned int mode);
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/* These are in kernel/dma.c: */
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/* reserve a DMA channel */
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extern int request_dma(unsigned int dmanr, const char *device_id);
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/* release it again */
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extern void free_dma(unsigned int dmanr);
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#endif
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#endif /* __KERNEL__ */
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