ppc4xx_dma.h

linux 内核源代码

/*
 * include/asm-ppc/ppc4xx_dma.h
 *
 * IBM PPC4xx DMA engine library
 *
 * Copyright 2000-2004 MontaVista Software Inc.
 *
 * Cleaned up a bit more, Matt Porter <[e-mail]>
 *
 * Original code by Armin Kuster <[e-mail]>
 * and Pete Popov <[e-mail]>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 * You should have received a copy of the  GNU General Public License along
 * with this program; if not, write  to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifdef __KERNEL__
#ifndef __ASMPPC_PPC4xx_DMA_H
#define __ASMPPC_PPC4xx_DMA_H

#include <linux/types.h>
#include <asm/mmu.h>
#include <asm/ibm4xx.h>

#undef DEBUG_4xxDMA

#define MAX_PPC4xx_DMA_CHANNELS		4

/*
 * Function return status codes
 * These values are used to indicate whether or not the function
 * call was successful, or a bad/invalid parameter was passed.
 */
#define DMA_STATUS_GOOD			0
#define DMA_STATUS_BAD_CHANNEL		1
#define DMA_STATUS_BAD_HANDLE		2
#define DMA_STATUS_BAD_MODE		3
#define DMA_STATUS_NULL_POINTER		4
#define DMA_STATUS_OUT_OF_MEMORY	5
#define DMA_STATUS_SGL_LIST_EMPTY	6
#define DMA_STATUS_GENERAL_ERROR	7
#define DMA_STATUS_CHANNEL_NOTFREE	8

#define DMA_CHANNEL_BUSY		0x80000000

/*
 * These indicate status as returned from the DMA Status Register.
 */
#define DMA_STATUS_NO_ERROR	0
#define DMA_STATUS_CS		1	/* Count Status        */
#define DMA_STATUS_TS		2	/* Transfer Status     */
#define DMA_STATUS_DMA_ERROR	3	/* DMA Error Occurred  */
#define DMA_STATUS_DMA_BUSY	4	/* The channel is busy */


/*
 * DMA Channel Control Registers
 */

#ifdef CONFIG_44x
#define	PPC4xx_DMA_64BIT
#define DMA_CR_OFFSET 1
#else
#define DMA_CR_OFFSET 0
#endif

#define DMA_CE_ENABLE        (1<<31)	/* DMA Channel Enable */
#define SET_DMA_CE_ENABLE(x) (((x)&0x1)<<31)
#define GET_DMA_CE_ENABLE(x) (((x)&DMA_CE_ENABLE)>>31)

#define DMA_CIE_ENABLE        (1<<30)	/* DMA Channel Interrupt Enable */
#define SET_DMA_CIE_ENABLE(x) (((x)&0x1)<<30)
#define GET_DMA_CIE_ENABLE(x) (((x)&DMA_CIE_ENABLE)>>30)

#define DMA_TD                (1<<29)
#define SET_DMA_TD(x)         (((x)&0x1)<<29)
#define GET_DMA_TD(x)         (((x)&DMA_TD)>>29)

#define DMA_PL                (1<<28)	/* Peripheral Location */
#define SET_DMA_PL(x)         (((x)&0x1)<<28)
#define GET_DMA_PL(x)         (((x)&DMA_PL)>>28)

#define EXTERNAL_PERIPHERAL    0
#define INTERNAL_PERIPHERAL    1

#define SET_DMA_PW(x)     (((x)&0x3)<<(26-DMA_CR_OFFSET))	/* Peripheral Width */
#define DMA_PW_MASK       SET_DMA_PW(3)
#define   PW_8                 0
#define   PW_16                1
#define   PW_32                2
#define   PW_64                3
/* FIXME: Add PW_128 support for 440GP DMA block */
#define GET_DMA_PW(x)     (((x)&DMA_PW_MASK)>>(26-DMA_CR_OFFSET))

#define DMA_DAI           (1<<(25-DMA_CR_OFFSET))	/* Destination Address Increment */
#define SET_DMA_DAI(x)    (((x)&0x1)<<(25-DMA_CR_OFFSET))

#define DMA_SAI           (1<<(24-DMA_CR_OFFSET))	/* Source Address Increment */
#define SET_DMA_SAI(x)    (((x)&0x1)<<(24-DMA_CR_OFFSET))

#define DMA_BEN           (1<<(23-DMA_CR_OFFSET))	/* Buffer Enable */
#define SET_DMA_BEN(x)    (((x)&0x1)<<(23-DMA_CR_OFFSET))

#define SET_DMA_TM(x)     (((x)&0x3)<<(21-DMA_CR_OFFSET))	/* Transfer Mode */
#define DMA_TM_MASK       SET_DMA_TM(3)
#define   TM_PERIPHERAL        0	/* Peripheral */
#define   TM_RESERVED          1	/* Reserved */
#define   TM_S_MM              2	/* Memory to Memory */
#define   TM_D_MM              3	/* Device Paced Memory to Memory */
#define GET_DMA_TM(x)     (((x)&DMA_TM_MASK)>>(21-DMA_CR_OFFSET))

#define SET_DMA_PSC(x)    (((x)&0x3)<<(19-DMA_CR_OFFSET))	/* Peripheral Setup Cycles */
#define DMA_PSC_MASK      SET_DMA_PSC(3)
#define GET_DMA_PSC(x)    (((x)&DMA_PSC_MASK)>>(19-DMA_CR_OFFSET))

#define SET_DMA_PWC(x)    (((x)&0x3F)<<(13-DMA_CR_OFFSET))	/* Peripheral Wait Cycles */
#define DMA_PWC_MASK      SET_DMA_PWC(0x3F)
#define GET_DMA_PWC(x)    (((x)&DMA_PWC_MASK)>>(13-DMA_CR_OFFSET))

#define SET_DMA_PHC(x)    (((x)&0x7)<<(10-DMA_CR_OFFSET))	/* Peripheral Hold Cycles */
#define DMA_PHC_MASK      SET_DMA_PHC(0x7)
#define GET_DMA_PHC(x)    (((x)&DMA_PHC_MASK)>>(10-DMA_CR_OFFSET))

#define DMA_ETD_OUTPUT     (1<<(9-DMA_CR_OFFSET))	/* EOT pin is a TC output */
#define SET_DMA_ETD(x)     (((x)&0x1)<<(9-DMA_CR_OFFSET))

#define DMA_TCE_ENABLE     (1<<(8-DMA_CR_OFFSET))
#define SET_DMA_TCE(x)     (((x)&0x1)<<(8-DMA_CR_OFFSET))

#define DMA_DEC            (1<<(2))	/* Address Decrement */
#define SET_DMA_DEC(x)     (((x)&0x1)<<2)
#define GET_DMA_DEC(x)     (((x)&DMA_DEC)>>2)


/*
 * Transfer Modes
 * These modes are defined in a way that makes it possible to
 * simply "or" in the value in the control register.
 */

#define DMA_MODE_MM		(SET_DMA_TM(TM_S_MM))	/* memory to memory */

				/* Device-paced memory to memory, */
				/* device is at source address    */
#define DMA_MODE_MM_DEVATSRC	(DMA_TD | SET_DMA_TM(TM_D_MM))

				/* Device-paced memory to memory,      */
				/* device is at destination address    */
#define DMA_MODE_MM_DEVATDST	(SET_DMA_TM(TM_D_MM))

/* 405gp/440gp */
#define SET_DMA_PREFETCH(x)   (((x)&0x3)<<(4-DMA_CR_OFFSET))	/* Memory Read Prefetch */
#define DMA_PREFETCH_MASK      SET_DMA_PREFETCH(3)
#define   PREFETCH_1           0	/* Prefetch 1 Double Word */
#define   PREFETCH_2           1
#define   PREFETCH_4           2
#define GET_DMA_PREFETCH(x) (((x)&DMA_PREFETCH_MASK)>>(4-DMA_CR_OFFSET))

#define DMA_PCE            (1<<(3-DMA_CR_OFFSET))	/* Parity Check Enable */
#define SET_DMA_PCE(x)     (((x)&0x1)<<(3-DMA_CR_OFFSET))
#define GET_DMA_PCE(x)     (((x)&DMA_PCE)>>(3-DMA_CR_OFFSET))

/* stb3x */

#define DMA_ECE_ENABLE (1<<5)
#define SET_DMA_ECE(x) (((x)&0x1)<<5)
#define GET_DMA_ECE(x) (((x)&DMA_ECE_ENABLE)>>5)

#define DMA_TCD_DISABLE	(1<<4)
#define SET_DMA_TCD(x) (((x)&0x1)<<4)
#define GET_DMA_TCD(x) (((x)&DMA_TCD_DISABLE)>>4)

typedef uint32_t sgl_handle_t;

#ifdef CONFIG_PPC4xx_EDMA

#define SGL_LIST_SIZE 4096
#define DMA_PPC4xx_SIZE SGL_LIST_SIZE

#define SET_DMA_PRIORITY(x)   (((x)&0x3)<<(6-DMA_CR_OFFSET))	/* DMA Channel Priority */
#define DMA_PRIORITY_MASK SET_DMA_PRIORITY(3)
#define PRIORITY_LOW           0
#define PRIORITY_MID_LOW       1
#define PRIORITY_MID_HIGH      2
#define PRIORITY_HIGH          3
#define GET_DMA_PRIORITY(x) (((x)&DMA_PRIORITY_MASK)>>(6-DMA_CR_OFFSET))

/*
 * DMA Polarity Configuration Register
 */
#define DMAReq_ActiveLow(chan) (1<<(31-(chan*3)))
#define DMAAck_ActiveLow(chan) (1<<(30-(chan*3)))
#define EOT_ActiveLow(chan)    (1<<(29-(chan*3)))	/* End of Transfer */

/*
 * DMA Sleep Mode Register
 */
#define SLEEP_MODE_ENABLE (1<<21)

/*
 * DMA Status Register
 */
#define DMA_CS0           (1<<31)	/* Terminal Count has been reached */
#define DMA_CS1           (1<<30)
#define DMA_CS2           (1<<29)
#define DMA_CS3           (1<<28)

#define DMA_TS0           (1<<27)	/* End of Transfer has been requested */
#define DMA_TS1           (1<<26)
#define DMA_TS2           (1<<25)
#define DMA_TS3           (1<<24)

#define DMA_CH0_ERR       (1<<23)	/* DMA Chanel 0 Error */
#define DMA_CH1_ERR       (1<<22)
#define DMA_CH2_ERR       (1<<21)
#define DMA_CH3_ERR       (1<<20)

#define DMA_IN_DMA_REQ0   (1<<19)	/* Internal DMA Request is pending */
#define DMA_IN_DMA_REQ1   (1<<18)
#define DMA_IN_DMA_REQ2   (1<<17)
#define DMA_IN_DMA_REQ3   (1<<16)

#define DMA_EXT_DMA_REQ0  (1<<15)	/* External DMA Request is pending */
#define DMA_EXT_DMA_REQ1  (1<<14)
#define DMA_EXT_DMA_REQ2  (1<<13)
#define DMA_EXT_DMA_REQ3  (1<<12)

#define DMA_CH0_BUSY      (1<<11)	/* DMA Channel 0 Busy */
#define DMA_CH1_BUSY      (1<<10)
#define DMA_CH2_BUSY       (1<<9)
#define DMA_CH3_BUSY       (1<<8)

#define DMA_SG0            (1<<7)	/* DMA Channel 0 Scatter/Gather in progress */
#define DMA_SG1            (1<<6)
#define DMA_SG2            (1<<5)
#define DMA_SG3            (1<<4)

/* DMA Channel Count Register */
#define DMA_CTC_BTEN     (1<<23)    /* Burst Enable/Disable bit */
#define DMA_CTC_BSIZ_MSK (3<<21)    /* Mask of the Burst size bits */
#define DMA_CTC_BSIZ_2   (0)
#define DMA_CTC_BSIZ_4   (1<<21)
#define DMA_CTC_BSIZ_8   (2<<21)
#define DMA_CTC_BSIZ_16  (3<<21)

/*
 * DMA SG Command Register
 */
#define SSG_ENABLE(chan)   	(1<<(31-chan))	/* Start Scatter Gather */
#define SSG_MASK_ENABLE(chan)	(1<<(15-chan))	/* Enable writing to SSG0 bit */

/*
 * DMA Scatter/Gather Descriptor Bit fields
 */
#define SG_LINK            (1<<31)	/* Link */
#define SG_TCI_ENABLE      (1<<29)	/* Enable Terminal Count Interrupt */
#define SG_ETI_ENABLE      (1<<28)	/* Enable End of Transfer Interrupt */
#define SG_ERI_ENABLE      (1<<27)	/* Enable Error Interrupt */
#define SG_COUNT_MASK       0xFFFF	/* Count Field */

#define SET_DMA_CONTROL \
 		(SET_DMA_CIE_ENABLE(p_init->int_enable) | /* interrupt enable         */ \
 		SET_DMA_BEN(p_init->buffer_enable)     | /* buffer enable            */\
		SET_DMA_ETD(p_init->etd_output)        | /* end of transfer pin      */ \
	       	SET_DMA_TCE(p_init->tce_enable)        | /* terminal count enable    */ \
                SET_DMA_PL(p_init->pl)                 | /* peripheral location      */ \
                SET_DMA_DAI(p_init->dai)               | /* dest addr increment      */ \
                SET_DMA_SAI(p_init->sai)               | /* src addr increment       */ \
                SET_DMA_PRIORITY(p_init->cp)           |  /* channel priority        */ \
                SET_DMA_PW(p_init->pwidth)             |  /* peripheral/bus width    */ \
                SET_DMA_PSC(p_init->psc)               |  /* peripheral setup cycles */ \
                SET_DMA_PWC(p_init->pwc)               |  /* peripheral wait cycles  */ \
                SET_DMA_PHC(p_init->phc)               |  /* peripheral hold cycles  */ \
                SET_DMA_PREFETCH(p_init->pf)              /* read prefetch           */)

#define GET_DMA_POLARITY(chan) (DMAReq_ActiveLow(chan) | DMAAck_ActiveLow(chan) | EOT_ActiveLow(chan))

#elif defined(CONFIG_STB03xxx)		/* stb03xxx */

#define DMA_PPC4xx_SIZE	4096

/*
 * DMA Status Register
 */