f57e1abd1b
Patch from Ben Dooks A number of small issues with the S3C24XX DMA have cropped up, which this patch fixes. These are: - check wether we can load another buff in start - update state handling in s3c2410_dma_lastxfer - only reload in irq if channel is not idle - more informative timeout errors (add source) - do not call request_irq() with irqs locked - added waitforstop function The patch also adds a S3C2410_DMAOP_STARTED for the occasions when the driver wants to ensure that the DMA system load state is resynced after loading. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
369 lines
9.8 KiB
C
369 lines
9.8 KiB
C
/* 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/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 */
|
|
|
|
|
|
/* 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 */
|
|
S3C2410_DMAOP_STARTED, /* indicate channel started */
|
|
};
|
|
|
|
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 */
|