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Diffstat (limited to 'include/asm-arm/arch-s3c2410/dma.h')
| -rw-r--r-- | include/asm-arm/arch-s3c2410/dma.h | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/include/asm-arm/arch-s3c2410/dma.h b/include/asm-arm/arch-s3c2410/dma.h new file mode 100644 index 000000000000..e830a40e573a --- /dev/null +++ b/include/asm-arm/arch-s3c2410/dma.h @@ -0,0 +1,376 @@ +/* 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 */ |