/* linux/include/asm-arm/arch-bast/dma.h * * Copyright (C) 2003,2004 Simtec Electronics * Ben Dooks <ben@simtec.co.uk> * * Samsung S3C2410X DMA support * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Changelog: * ??-May-2003 BJD Created file * ??-Jun-2003 BJD Added more dma functionality to go with arch * 10-Nov-2004 BJD Added sys_device support */ #ifndef __ASM_ARCH_DMA_H #define __ASM_ARCH_DMA_H __FILE__ #include <linux/config.h> #include <linux/sysdev.h> #include "hardware.h" /* * This is the maximum DMA address(physical address) that can be DMAd to. * */ #define MAX_DMA_ADDRESS 0x20000000 #define MAX_DMA_TRANSFER_SIZE 0x100000 /* Data Unit is half word */ /* according to the samsung port, we cannot use the regular * dma channels... we must therefore provide our own interface * for DMA, and allow our drivers to use that. */ #define MAX_DMA_CHANNELS 0 /* we have 4 dma channels */ #define S3C2410_DMA_CHANNELS (4) /* types */ typedef enum { S3C2410_DMA_IDLE, S3C2410_DMA_RUNNING, S3C2410_DMA_PAUSED } s3c2410_dma_state_t; /* s3c2410_dma_loadst_t * * This represents the state of the DMA engine, wrt to the loaded / running * transfers. Since we don't have any way of knowing exactly the state of * the DMA transfers, we need to know the state to make decisions on wether * we can * * S3C2410_DMA_NONE * * There are no buffers loaded (the channel should be inactive) * * S3C2410_DMA_1LOADED * * There is one buffer loaded, however it has not been confirmed to be * loaded by the DMA engine. This may be because the channel is not * yet running, or the DMA driver decided that it was too costly to * sit and wait for it to happen. * * S3C2410_DMA_1RUNNING * * The buffer has been confirmed running, and not finisged * * S3C2410_DMA_1LOADED_1RUNNING * * There is a buffer waiting to be loaded by the DMA engine, and one * currently running. */ typedef enum { S3C2410_DMALOAD_NONE, S3C2410_DMALOAD_1LOADED, S3C2410_DMALOAD_1RUNNING, S3C2410_DMALOAD_1LOADED_1RUNNING, } s3c2410_dma_loadst_t; typedef enum { S3C2410_RES_OK, S3C2410_RES_ERR, S3C2410_RES_ABORT } s3c2410_dma_buffresult_t; typedef enum s3c2410_dmasrc_e s3c2410_dmasrc_t; enum s3c2410_dmasrc_e { S3C2410_DMASRC_HW, /* source is memory */ S3C2410_DMASRC_MEM /* source is hardware */ }; /* enum s3c2410_chan_op_e * * operation codes passed to the DMA code by the user, and also used * to inform the current channel owner of any changes to the system state */ enum s3c2410_chan_op_e { S3C2410_DMAOP_START, S3C2410_DMAOP_STOP, S3C2410_DMAOP_PAUSE, S3C2410_DMAOP_RESUME, S3C2410_DMAOP_FLUSH, S3C2410_DMAOP_TIMEOUT, /* internal signal to handler */ }; typedef enum s3c2410_chan_op_e s3c2410_chan_op_t; /* flags */ #define S3C2410_DMAF_SLOW (1<<0) /* slow, so don't worry about * waiting for reloads */ #define S3C2410_DMAF_AUTOSTART (1<<1) /* auto-start if buffer queued */ /* dma buffer */ typedef struct s3c2410_dma_buf_s s3c2410_dma_buf_t; struct s3c2410_dma_client { char *name; }; typedef struct s3c2410_dma_client s3c2410_dma_client_t; /* s3c2410_dma_buf_s * * internally used buffer structure to describe a queued or running * buffer. */ struct s3c2410_dma_buf_s { s3c2410_dma_buf_t *next; int magic; /* magic */ int size; /* buffer size in bytes */ dma_addr_t data; /* start of DMA data */ dma_addr_t ptr; /* where the DMA got to [1] */ void *id; /* client's id */ }; /* [1] is this updated for both recv/send modes? */ typedef struct s3c2410_dma_chan_s s3c2410_dma_chan_t; /* s3c2410_dma_cbfn_t * * buffer callback routine type */ typedef void (*s3c2410_dma_cbfn_t)(s3c2410_dma_chan_t *, void *buf, int size, s3c2410_dma_buffresult_t result); typedef int (*s3c2410_dma_opfn_t)(s3c2410_dma_chan_t *, s3c2410_chan_op_t ); struct s3c2410_dma_stats_s { unsigned long loads; unsigned long timeout_longest; unsigned long timeout_shortest; unsigned long timeout_avg; unsigned long timeout_failed; }; typedef struct s3c2410_dma_stats_s s3c2410_dma_stats_t; /* struct s3c2410_dma_chan_s * * full state information for each DMA channel */ struct s3c2410_dma_chan_s { /* channel state flags and information */ unsigned char number; /* number of this dma channel */ unsigned char in_use; /* channel allocated */ unsigned char irq_claimed; /* irq claimed for channel */ unsigned char irq_enabled; /* irq enabled for channel */ unsigned char xfer_unit; /* size of an transfer */ /* channel state */ s3c2410_dma_state_t state; s3c2410_dma_loadst_t load_state; s3c2410_dma_client_t *client; /* channel configuration */ s3c2410_dmasrc_t source; unsigned long dev_addr; unsigned long load_timeout; unsigned int flags; /* channel flags */ /* channel's hardware position and configuration */ void __iomem *regs; /* channels registers */ void __iomem *addr_reg; /* data address register */ unsigned int irq; /* channel irq */ unsigned long dcon; /* default value of DCON */ /* driver handles */ s3c2410_dma_cbfn_t callback_fn; /* buffer done callback */ s3c2410_dma_opfn_t op_fn; /* channel operation callback */ /* stats gathering */ s3c2410_dma_stats_t *stats; s3c2410_dma_stats_t stats_store; /* buffer list and information */ s3c2410_dma_buf_t *curr; /* current dma buffer */ s3c2410_dma_buf_t *next; /* next buffer to load */ s3c2410_dma_buf_t *end; /* end of queue */ /* system device */ struct sys_device dev; }; /* the currently allocated channel information */ extern s3c2410_dma_chan_t s3c2410_chans[]; /* note, we don't really use dma_device_t at the moment */ typedef unsigned long dma_device_t; /* functions --------------------------------------------------------------- */ /* s3c2410_dma_request * * request a dma channel exclusivley */ extern int s3c2410_dma_request(dmach_t channel, s3c2410_dma_client_t *, void *dev); /* s3c2410_dma_ctrl * * change the state of the dma channel */ extern int s3c2410_dma_ctrl(dmach_t channel, s3c2410_chan_op_t op); /* s3c2410_dma_setflags * * set the channel's flags to a given state */ extern int s3c2410_dma_setflags(dmach_t channel, unsigned int flags); /* s3c2410_dma_free * * free the dma channel (will also abort any outstanding operations) */ extern int s3c2410_dma_free(dmach_t channel, s3c2410_dma_client_t *); /* s3c2410_dma_enqueue * * place the given buffer onto the queue of operations for the channel. * The buffer must be allocated from dma coherent memory, or the Dcache/WB * drained before the buffer is given to the DMA system. */ extern int s3c2410_dma_enqueue(dmach_t channel, void *id, dma_addr_t data, int size); /* s3c2410_dma_config * * configure the dma channel */ extern int s3c2410_dma_config(dmach_t channel, int xferunit, int dcon); /* s3c2410_dma_devconfig * * configure the device we're talking to */ extern int s3c2410_dma_devconfig(int channel, s3c2410_dmasrc_t source, int hwcfg, unsigned long devaddr); /* s3c2410_dma_getposition * * get the position that the dma transfer is currently at */ extern int s3c2410_dma_getposition(dmach_t channel, dma_addr_t *src, dma_addr_t *dest); extern int s3c2410_dma_set_opfn(dmach_t, s3c2410_dma_opfn_t rtn); extern int s3c2410_dma_set_buffdone_fn(dmach_t, s3c2410_dma_cbfn_t rtn); /* DMA Register definitions */ #define S3C2410_DMA_DISRC (0x00) #define S3C2410_DMA_DISRCC (0x04) #define S3C2410_DMA_DIDST (0x08) #define S3C2410_DMA_DIDSTC (0x0C) #define S3C2410_DMA_DCON (0x10) #define S3C2410_DMA_DSTAT (0x14) #define S3C2410_DMA_DCSRC (0x18) #define S3C2410_DMA_DCDST (0x1C) #define S3C2410_DMA_DMASKTRIG (0x20) #define S3C2410_DISRCC_INC (1<<0) #define S3C2410_DISRCC_APB (1<<1) #define S3C2410_DMASKTRIG_STOP (1<<2) #define S3C2410_DMASKTRIG_ON (1<<1) #define S3C2410_DMASKTRIG_SWTRIG (1<<0) #define S3C2410_DCON_DEMAND (0<<31) #define S3C2410_DCON_HANDSHAKE (1<<31) #define S3C2410_DCON_SYNC_PCLK (0<<30) #define S3C2410_DCON_SYNC_HCLK (1<<30) #define S3C2410_DCON_INTREQ (1<<29) #define S3C2410_DCON_CH0_XDREQ0 (0<<24) #define S3C2410_DCON_CH0_UART0 (1<<24) #define S3C2410_DCON_CH0_SDI (2<<24) #define S3C2410_DCON_CH0_TIMER (3<<24) #define S3C2410_DCON_CH0_USBEP1 (4<<24) #define S3C2410_DCON_CH1_XDREQ1 (0<<24) #define S3C2410_DCON_CH1_UART1 (1<<24) #define S3C2410_DCON_CH1_I2SSDI (2<<24) #define S3C2410_DCON_CH1_SPI (3<<24) #define S3C2410_DCON_CH1_USBEP2 (4<<24) #define S3C2410_DCON_CH2_I2SSDO (0<<24) #define S3C2410_DCON_CH2_I2SSDI (1<<24) #define S3C2410_DCON_CH2_SDI (2<<24) #define S3C2410_DCON_CH2_TIMER (3<<24) #define S3C2410_DCON_CH2_USBEP3 (4<<24) #define S3C2410_DCON_CH3_UART2 (0<<24) #define S3C2410_DCON_CH3_SDI (1<<24) #define S3C2410_DCON_CH3_SPI (2<<24) #define S3C2410_DCON_CH3_TIMER (3<<24) #define S3C2410_DCON_CH3_USBEP4 (4<<24) #define S3C2410_DCON_SRCSHIFT (24) #define S3C2410_DCON_SRCMASK (7<<24) #define S3C2410_DCON_BYTE (0<<20) #define S3C2410_DCON_HALFWORD (1<<20) #define S3C2410_DCON_WORD (2<<20) #define S3C2410_DCON_AUTORELOAD (0<<22) #define S3C2410_DCON_NORELOAD (1<<22) #define S3C2410_DCON_HWTRIG (1<<23) #ifdef CONFIG_CPU_S3C2440 #define S3C2440_DIDSTC_CHKINT (1<<2) #define S3C2440_DCON_CH0_I2SSDO (5<<24) #define S3C2440_DCON_CH0_PCMIN (6<<24) #define S3C2440_DCON_CH1_PCMOUT (5<<24) #define S3C2440_DCON_CH1_SDI (6<<24) #define S3C2440_DCON_CH2_PCMIN (5<<24) #define S3C2440_DCON_CH2_MICIN (6<<24) #define S3C2440_DCON_CH3_MICIN (5<<24) #define S3C2440_DCON_CH3_PCMOUT (6<<24) #endif #endif /* __ASM_ARCH_DMA_H */