1 /* linux/include/asm-arm/arch-s3c2410/dma.h
3 * Copyright (C) 2003,2004,2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
6 * Samsung S3C241XX DMA support
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #ifndef __ASM_ARCH_DMA_H
14 #define __ASM_ARCH_DMA_H __FILE__
16 #include <linux/sysdev.h>
20 * This is the maximum DMA address(physical address) that can be DMAd to.
23 #define MAX_DMA_ADDRESS 0x40000000
24 #define MAX_DMA_TRANSFER_SIZE 0x100000 /* Data Unit is half word */
26 /* We use `virtual` dma channels to hide the fact we have only a limited
27 * number of DMA channels, and not of all of them (dependant on the device)
28 * can be attached to any DMA source. We therefore let the DMA core handle
29 * the allocation of hardware channels to clients.
51 DMACH_MAX, /* the end entry */
54 #define DMACH_LOW_LEVEL (1<<28) /* use this to specifiy hardware ch no */
56 /* we have 4 dma channels */
57 #define S3C2410_DMA_CHANNELS (4)
61 enum s3c2410_dma_state {
68 /* enum s3c2410_dma_loadst
70 * This represents the state of the DMA engine, wrt to the loaded / running
71 * transfers. Since we don't have any way of knowing exactly the state of
72 * the DMA transfers, we need to know the state to make decisions on wether
77 * There are no buffers loaded (the channel should be inactive)
81 * There is one buffer loaded, however it has not been confirmed to be
82 * loaded by the DMA engine. This may be because the channel is not
83 * yet running, or the DMA driver decided that it was too costly to
84 * sit and wait for it to happen.
86 * S3C2410_DMA_1RUNNING
88 * The buffer has been confirmed running, and not finisged
90 * S3C2410_DMA_1LOADED_1RUNNING
92 * There is a buffer waiting to be loaded by the DMA engine, and one
96 enum s3c2410_dma_loadst {
98 S3C2410_DMALOAD_1LOADED,
99 S3C2410_DMALOAD_1RUNNING,
100 S3C2410_DMALOAD_1LOADED_1RUNNING,
103 enum s3c2410_dma_buffresult {
109 enum s3c2410_dmasrc {
110 S3C2410_DMASRC_HW, /* source is memory */
111 S3C2410_DMASRC_MEM /* source is hardware */
114 /* enum s3c2410_chan_op
116 * operation codes passed to the DMA code by the user, and also used
117 * to inform the current channel owner of any changes to the system state
120 enum s3c2410_chan_op {
124 S3C2410_DMAOP_RESUME,
126 S3C2410_DMAOP_TIMEOUT, /* internal signal to handler */
127 S3C2410_DMAOP_STARTED, /* indicate channel started */
132 #define S3C2410_DMAF_SLOW (1<<0) /* slow, so don't worry about
133 * waiting for reloads */
134 #define S3C2410_DMAF_AUTOSTART (1<<1) /* auto-start if buffer queued */
138 struct s3c2410_dma_client {
144 * internally used buffer structure to describe a queued or running
148 struct s3c2410_dma_buf;
149 struct s3c2410_dma_buf {
150 struct s3c2410_dma_buf *next;
151 int magic; /* magic */
152 int size; /* buffer size in bytes */
153 dma_addr_t data; /* start of DMA data */
154 dma_addr_t ptr; /* where the DMA got to [1] */
155 void *id; /* client's id */
158 /* [1] is this updated for both recv/send modes? */
160 struct s3c2410_dma_chan;
162 /* s3c2410_dma_cbfn_t
164 * buffer callback routine type
167 typedef void (*s3c2410_dma_cbfn_t)(struct s3c2410_dma_chan *,
169 enum s3c2410_dma_buffresult result);
171 typedef int (*s3c2410_dma_opfn_t)(struct s3c2410_dma_chan *,
172 enum s3c2410_chan_op );
174 struct s3c2410_dma_stats {
176 unsigned long timeout_longest;
177 unsigned long timeout_shortest;
178 unsigned long timeout_avg;
179 unsigned long timeout_failed;
182 struct s3c2410_dma_map;
184 /* struct s3c2410_dma_chan
186 * full state information for each DMA channel
189 struct s3c2410_dma_chan {
190 /* channel state flags and information */
191 unsigned char number; /* number of this dma channel */
192 unsigned char in_use; /* channel allocated */
193 unsigned char irq_claimed; /* irq claimed for channel */
194 unsigned char irq_enabled; /* irq enabled for channel */
195 unsigned char xfer_unit; /* size of an transfer */
199 enum s3c2410_dma_state state;
200 enum s3c2410_dma_loadst load_state;
201 struct s3c2410_dma_client *client;
203 /* channel configuration */
204 enum s3c2410_dmasrc source;
205 unsigned long dev_addr;
206 unsigned long load_timeout;
207 unsigned int flags; /* channel flags */
209 struct s3c24xx_dma_map *map; /* channel hw maps */
211 /* channel's hardware position and configuration */
212 void __iomem *regs; /* channels registers */
213 void __iomem *addr_reg; /* data address register */
214 unsigned int irq; /* channel irq */
215 unsigned long dcon; /* default value of DCON */
218 s3c2410_dma_cbfn_t callback_fn; /* buffer done callback */
219 s3c2410_dma_opfn_t op_fn; /* channel op callback */
221 /* stats gathering */
222 struct s3c2410_dma_stats *stats;
223 struct s3c2410_dma_stats stats_store;
225 /* buffer list and information */
226 struct s3c2410_dma_buf *curr; /* current dma buffer */
227 struct s3c2410_dma_buf *next; /* next buffer to load */
228 struct s3c2410_dma_buf *end; /* end of queue */
231 struct sys_device dev;
234 /* the currently allocated channel information */
235 extern struct s3c2410_dma_chan s3c2410_chans[];
237 /* note, we don't really use dma_device_t at the moment */
238 typedef unsigned long dma_device_t;
240 /* functions --------------------------------------------------------------- */
242 /* s3c2410_dma_request
244 * request a dma channel exclusivley
247 extern int s3c2410_dma_request(dmach_t channel,
248 struct s3c2410_dma_client *, void *dev);
253 * change the state of the dma channel
256 extern int s3c2410_dma_ctrl(dmach_t channel, enum s3c2410_chan_op op);
258 /* s3c2410_dma_setflags
260 * set the channel's flags to a given state
263 extern int s3c2410_dma_setflags(dmach_t channel,
268 * free the dma channel (will also abort any outstanding operations)
271 extern int s3c2410_dma_free(dmach_t channel, struct s3c2410_dma_client *);
273 /* s3c2410_dma_enqueue
275 * place the given buffer onto the queue of operations for the channel.
276 * The buffer must be allocated from dma coherent memory, or the Dcache/WB
277 * drained before the buffer is given to the DMA system.
280 extern int s3c2410_dma_enqueue(dmach_t channel, void *id,
281 dma_addr_t data, int size);
283 /* s3c2410_dma_config
285 * configure the dma channel
288 extern int s3c2410_dma_config(dmach_t channel, int xferunit, int dcon);
290 /* s3c2410_dma_devconfig
292 * configure the device we're talking to
295 extern int s3c2410_dma_devconfig(int channel, enum s3c2410_dmasrc source,
296 int hwcfg, unsigned long devaddr);
298 /* s3c2410_dma_getposition
300 * get the position that the dma transfer is currently at
303 extern int s3c2410_dma_getposition(dmach_t channel,
304 dma_addr_t *src, dma_addr_t *dest);
306 extern int s3c2410_dma_set_opfn(dmach_t, s3c2410_dma_opfn_t rtn);
307 extern int s3c2410_dma_set_buffdone_fn(dmach_t, s3c2410_dma_cbfn_t rtn);
309 /* DMA Register definitions */
311 #define S3C2410_DMA_DISRC (0x00)
312 #define S3C2410_DMA_DISRCC (0x04)
313 #define S3C2410_DMA_DIDST (0x08)
314 #define S3C2410_DMA_DIDSTC (0x0C)
315 #define S3C2410_DMA_DCON (0x10)
316 #define S3C2410_DMA_DSTAT (0x14)
317 #define S3C2410_DMA_DCSRC (0x18)
318 #define S3C2410_DMA_DCDST (0x1C)
319 #define S3C2410_DMA_DMASKTRIG (0x20)
321 #define S3C2410_DISRCC_INC (1<<0)
322 #define S3C2410_DISRCC_APB (1<<1)
324 #define S3C2410_DMASKTRIG_STOP (1<<2)
325 #define S3C2410_DMASKTRIG_ON (1<<1)
326 #define S3C2410_DMASKTRIG_SWTRIG (1<<0)
328 #define S3C2410_DCON_DEMAND (0<<31)
329 #define S3C2410_DCON_HANDSHAKE (1<<31)
330 #define S3C2410_DCON_SYNC_PCLK (0<<30)
331 #define S3C2410_DCON_SYNC_HCLK (1<<30)
333 #define S3C2410_DCON_INTREQ (1<<29)
335 #define S3C2410_DCON_CH0_XDREQ0 (0<<24)
336 #define S3C2410_DCON_CH0_UART0 (1<<24)
337 #define S3C2410_DCON_CH0_SDI (2<<24)
338 #define S3C2410_DCON_CH0_TIMER (3<<24)
339 #define S3C2410_DCON_CH0_USBEP1 (4<<24)
341 #define S3C2410_DCON_CH1_XDREQ1 (0<<24)
342 #define S3C2410_DCON_CH1_UART1 (1<<24)
343 #define S3C2410_DCON_CH1_I2SSDI (2<<24)
344 #define S3C2410_DCON_CH1_SPI (3<<24)
345 #define S3C2410_DCON_CH1_USBEP2 (4<<24)
347 #define S3C2410_DCON_CH2_I2SSDO (0<<24)
348 #define S3C2410_DCON_CH2_I2SSDI (1<<24)
349 #define S3C2410_DCON_CH2_SDI (2<<24)
350 #define S3C2410_DCON_CH2_TIMER (3<<24)
351 #define S3C2410_DCON_CH2_USBEP3 (4<<24)
353 #define S3C2410_DCON_CH3_UART2 (0<<24)
354 #define S3C2410_DCON_CH3_SDI (1<<24)
355 #define S3C2410_DCON_CH3_SPI (2<<24)
356 #define S3C2410_DCON_CH3_TIMER (3<<24)
357 #define S3C2410_DCON_CH3_USBEP4 (4<<24)
359 #define S3C2410_DCON_SRCSHIFT (24)
360 #define S3C2410_DCON_SRCMASK (7<<24)
362 #define S3C2410_DCON_BYTE (0<<20)
363 #define S3C2410_DCON_HALFWORD (1<<20)
364 #define S3C2410_DCON_WORD (2<<20)
366 #define S3C2410_DCON_AUTORELOAD (0<<22)
367 #define S3C2410_DCON_NORELOAD (1<<22)
368 #define S3C2410_DCON_HWTRIG (1<<23)
370 #ifdef CONFIG_CPU_S3C2440
371 #define S3C2440_DIDSTC_CHKINT (1<<2)
373 #define S3C2440_DCON_CH0_I2SSDO (5<<24)
374 #define S3C2440_DCON_CH0_PCMIN (6<<24)
376 #define S3C2440_DCON_CH1_PCMOUT (5<<24)
377 #define S3C2440_DCON_CH1_SDI (6<<24)
379 #define S3C2440_DCON_CH2_PCMIN (5<<24)
380 #define S3C2440_DCON_CH2_MICIN (6<<24)
382 #define S3C2440_DCON_CH3_MICIN (5<<24)
383 #define S3C2440_DCON_CH3_PCMOUT (6<<24)
386 #endif /* __ASM_ARCH_DMA_H */