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linux-2.6/include/asm-arm/arch-s3c2410/dma.h
Ben Dooks c58f7a1d36 [ARM] 4781/1: S3C24XX: DMA suspend and resume support 
If an DMA channel was active at suspend, then ensure that
it is correctly reconfigured when the system resumes.

Note, the previous policy was for each driver to handle their
own reconfiguration on resume. The policy has been changed to
make the individual driver's job easier.

Signed-off-by: Ben Dooks <ben-linux@flfuf.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-01-28 13:20:51 +00:00

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/* linux/include/asm-arm/arch-s3c2410/dma.h
*
* Copyright (C) 2003,2004,2006 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* Samsung S3C241XX 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.
*/
#ifndef __ASM_ARCH_DMA_H
#define __ASM_ARCH_DMA_H __FILE__
#include <linux/sysdev.h>
#include <asm/hardware.h>
/*
* This is the maximum DMA address(physical address) that can be DMAd to.
*
*/
#define MAX_DMA_ADDRESS 0x40000000
#define MAX_DMA_TRANSFER_SIZE 0x100000 /* Data Unit is half word */
/* We use `virtual` dma channels to hide the fact we have only a limited
* number of DMA channels, and not of all of them (dependant on the device)
* can be attached to any DMA source. We therefore let the DMA core handle
* the allocation of hardware channels to clients.
*/
enum dma_ch {
DMACH_XD0,
DMACH_XD1,
DMACH_SDI,
DMACH_SPI0,
DMACH_SPI1,
DMACH_UART0,
DMACH_UART1,
DMACH_UART2,
DMACH_TIMER,
DMACH_I2S_IN,
DMACH_I2S_OUT,
DMACH_PCM_IN,
DMACH_PCM_OUT,
DMACH_MIC_IN,
DMACH_USB_EP1,
DMACH_USB_EP2,
DMACH_USB_EP3,
DMACH_USB_EP4,
DMACH_UART0_SRC2, /* s3c2412 second uart sources */
DMACH_UART1_SRC2,
DMACH_UART2_SRC2,
DMACH_UART3, /* s3c2443 has extra uart */
DMACH_UART3_SRC2,
DMACH_MAX, /* the end entry */
};
#define DMACH_LOW_LEVEL (1<<28) /* use this to specifiy hardware ch no */
/* we have 4 dma channels */
#ifndef CONFIG_CPU_S3C2443
#define S3C2410_DMA_CHANNELS (4)
#else
#define S3C2410_DMA_CHANNELS (6)
#endif
/* types */
enum s3c2410_dma_state {
S3C2410_DMA_IDLE,
S3C2410_DMA_RUNNING,
S3C2410_DMA_PAUSED
};
/* enum s3c2410_dma_loadst
*
* 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.
*/
enum s3c2410_dma_loadst {
S3C2410_DMALOAD_NONE,
S3C2410_DMALOAD_1LOADED,
S3C2410_DMALOAD_1RUNNING,
S3C2410_DMALOAD_1LOADED_1RUNNING,
};
enum s3c2410_dma_buffresult {
S3C2410_RES_OK,
S3C2410_RES_ERR,
S3C2410_RES_ABORT
};
enum s3c2410_dmasrc {
S3C2410_DMASRC_HW, /* source is memory */
S3C2410_DMASRC_MEM /* source is hardware */
};
/* enum s3c2410_chan_op
*
* 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 {
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 */
};
/* 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 */
struct s3c2410_dma_client {
char *name;
};
/* s3c2410_dma_buf_s
*
* internally used buffer structure to describe a queued or running
* buffer.
*/
struct s3c2410_dma_buf;
struct s3c2410_dma_buf {
struct s3c2410_dma_buf *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? */
struct s3c2410_dma_chan;
/* s3c2410_dma_cbfn_t
*
* buffer callback routine type
*/
typedef void (*s3c2410_dma_cbfn_t)(struct s3c2410_dma_chan *,
void *buf, int size,
enum s3c2410_dma_buffresult result);
typedef int (*s3c2410_dma_opfn_t)(struct s3c2410_dma_chan *,
enum s3c2410_chan_op );
struct s3c2410_dma_stats {
unsigned long loads;
unsigned long timeout_longest;
unsigned long timeout_shortest;
unsigned long timeout_avg;
unsigned long timeout_failed;
};
struct s3c2410_dma_map;
/* struct s3c2410_dma_chan
*
* full state information for each DMA channel
*/
struct s3c2410_dma_chan {
/* 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 */
enum s3c2410_dma_state state;
enum s3c2410_dma_loadst load_state;
struct s3c2410_dma_client *client;
/* channel configuration */
enum s3c2410_dmasrc source;
unsigned long dev_addr;
unsigned long load_timeout;
unsigned int flags; /* channel flags */
unsigned int hw_cfg; /* last hw config */
struct s3c24xx_dma_map *map; /* channel hw maps */
/* 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 op callback */
/* stats gathering */
struct s3c2410_dma_stats *stats;
struct s3c2410_dma_stats stats_store;
/* buffer list and information */
struct s3c2410_dma_buf *curr; /* current dma buffer */
struct s3c2410_dma_buf *next; /* next buffer to load */
struct s3c2410_dma_buf *end; /* end of queue */
/* system device */
struct sys_device dev;
};
/* the currently allocated channel information */
extern struct s3c2410_dma_chan 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,
struct s3c2410_dma_client *, void *dev);
/* s3c2410_dma_ctrl
*
* change the state of the dma channel
*/
extern int s3c2410_dma_ctrl(dmach_t channel, enum s3c2410_chan_op 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, struct s3c2410_dma_client *);
/* 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, enum s3c2410_dmasrc 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 S3C2412_DMA_DMAREQSEL (0x24)
#define S3C2443_DMA_DMAREQSEL (0x24)
#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
#ifdef CONFIG_CPU_S3C2412
#define S3C2412_DMAREQSEL_SRC(x) ((x)<<1)
#define S3C2412_DMAREQSEL_HW (1)
#define S3C2412_DMAREQSEL_SPI0TX S3C2412_DMAREQSEL_SRC(0)
#define S3C2412_DMAREQSEL_SPI0RX S3C2412_DMAREQSEL_SRC(1)
#define S3C2412_DMAREQSEL_SPI1TX S3C2412_DMAREQSEL_SRC(2)
#define S3C2412_DMAREQSEL_SPI1RX S3C2412_DMAREQSEL_SRC(3)
#define S3C2412_DMAREQSEL_I2STX S3C2412_DMAREQSEL_SRC(4)
#define S3C2412_DMAREQSEL_I2SRX S3C2412_DMAREQSEL_SRC(5)
#define S3C2412_DMAREQSEL_TIMER S3C2412_DMAREQSEL_SRC(9)
#define S3C2412_DMAREQSEL_SDI S3C2412_DMAREQSEL_SRC(10)
#define S3C2412_DMAREQSEL_USBEP1 S3C2412_DMAREQSEL_SRC(13)
#define S3C2412_DMAREQSEL_USBEP2 S3C2412_DMAREQSEL_SRC(14)
#define S3C2412_DMAREQSEL_USBEP3 S3C2412_DMAREQSEL_SRC(15)
#define S3C2412_DMAREQSEL_USBEP4 S3C2412_DMAREQSEL_SRC(16)
#define S3C2412_DMAREQSEL_XDREQ0 S3C2412_DMAREQSEL_SRC(17)
#define S3C2412_DMAREQSEL_XDREQ1 S3C2412_DMAREQSEL_SRC(18)
#define S3C2412_DMAREQSEL_UART0_0 S3C2412_DMAREQSEL_SRC(19)
#define S3C2412_DMAREQSEL_UART0_1 S3C2412_DMAREQSEL_SRC(20)
#define S3C2412_DMAREQSEL_UART1_0 S3C2412_DMAREQSEL_SRC(21)
#define S3C2412_DMAREQSEL_UART1_1 S3C2412_DMAREQSEL_SRC(22)
#define S3C2412_DMAREQSEL_UART2_0 S3C2412_DMAREQSEL_SRC(23)
#define S3C2412_DMAREQSEL_UART2_1 S3C2412_DMAREQSEL_SRC(24)
#endif
#define S3C2443_DMAREQSEL_SRC(x) ((x)<<1)
#define S3C2443_DMAREQSEL_HW (1)
#define S3C2443_DMAREQSEL_SPI0TX S3C2443_DMAREQSEL_SRC(0)
#define S3C2443_DMAREQSEL_SPI0RX S3C2443_DMAREQSEL_SRC(1)
#define S3C2443_DMAREQSEL_SPI1TX S3C2443_DMAREQSEL_SRC(2)
#define S3C2443_DMAREQSEL_SPI1RX S3C2443_DMAREQSEL_SRC(3)
#define S3C2443_DMAREQSEL_I2STX S3C2443_DMAREQSEL_SRC(4)
#define S3C2443_DMAREQSEL_I2SRX S3C2443_DMAREQSEL_SRC(5)
#define S3C2443_DMAREQSEL_TIMER S3C2443_DMAREQSEL_SRC(9)
#define S3C2443_DMAREQSEL_SDI S3C2443_DMAREQSEL_SRC(10)
#define S3C2443_DMAREQSEL_XDREQ0 S3C2443_DMAREQSEL_SRC(17)
#define S3C2443_DMAREQSEL_XDREQ1 S3C2443_DMAREQSEL_SRC(18)
#define S3C2443_DMAREQSEL_UART0_0 S3C2443_DMAREQSEL_SRC(19)
#define S3C2443_DMAREQSEL_UART0_1 S3C2443_DMAREQSEL_SRC(20)
#define S3C2443_DMAREQSEL_UART1_0 S3C2443_DMAREQSEL_SRC(21)
#define S3C2443_DMAREQSEL_UART1_1 S3C2443_DMAREQSEL_SRC(22)
#define S3C2443_DMAREQSEL_UART2_0 S3C2443_DMAREQSEL_SRC(23)
#define S3C2443_DMAREQSEL_UART2_1 S3C2443_DMAREQSEL_SRC(24)
#define S3C2443_DMAREQSEL_UART3_0 S3C2443_DMAREQSEL_SRC(25)
#define S3C2443_DMAREQSEL_UART3_1 S3C2443_DMAREQSEL_SRC(26)
#define S3C2443_DMAREQSEL_PCMOUT S3C2443_DMAREQSEL_SRC(27)
#define S3C2443_DMAREQSEL_PCMIN S3C2443_DMAREQSEL_SRC(28)
#define S3C2443_DMAREQSEL_MICIN S3C2443_DMAREQSEL_SRC(29)
#endif /* __ASM_ARCH_DMA_H */
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