1 /* arch/arm/mach-s3c2410/include/mach/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>
17 #include <mach/hardware.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_UART0_SRC2, /* s3c2412 second uart sources */
54 DMACH_UART3, /* s3c2443 has extra uart */
56 DMACH_MAX, /* the end entry */
59 #define DMACH_LOW_LEVEL (1<<28) /* use this to specifiy hardware ch no */
61 /* we have 4 dma channels */
62 #ifndef CONFIG_CPU_S3C2443
63 #define S3C2410_DMA_CHANNELS (4)
65 #define S3C2410_DMA_CHANNELS (6)
70 enum s3c2410_dma_state {
77 /* enum s3c2410_dma_loadst
79 * This represents the state of the DMA engine, wrt to the loaded / running
80 * transfers. Since we don't have any way of knowing exactly the state of
81 * the DMA transfers, we need to know the state to make decisions on wether
86 * There are no buffers loaded (the channel should be inactive)
90 * There is one buffer loaded, however it has not been confirmed to be
91 * loaded by the DMA engine. This may be because the channel is not
92 * yet running, or the DMA driver decided that it was too costly to
93 * sit and wait for it to happen.
95 * S3C2410_DMA_1RUNNING
97 * The buffer has been confirmed running, and not finisged
99 * S3C2410_DMA_1LOADED_1RUNNING
101 * There is a buffer waiting to be loaded by the DMA engine, and one
105 enum s3c2410_dma_loadst {
106 S3C2410_DMALOAD_NONE,
107 S3C2410_DMALOAD_1LOADED,
108 S3C2410_DMALOAD_1RUNNING,
109 S3C2410_DMALOAD_1LOADED_1RUNNING,
112 enum s3c2410_dma_buffresult {
118 enum s3c2410_dmasrc {
119 S3C2410_DMASRC_HW, /* source is memory */
120 S3C2410_DMASRC_MEM /* source is hardware */
123 /* enum s3c2410_chan_op
125 * operation codes passed to the DMA code by the user, and also used
126 * to inform the current channel owner of any changes to the system state
129 enum s3c2410_chan_op {
133 S3C2410_DMAOP_RESUME,
135 S3C2410_DMAOP_TIMEOUT, /* internal signal to handler */
136 S3C2410_DMAOP_STARTED, /* indicate channel started */
141 #define S3C2410_DMAF_SLOW (1<<0) /* slow, so don't worry about
142 * waiting for reloads */
143 #define S3C2410_DMAF_AUTOSTART (1<<1) /* auto-start if buffer queued */
147 struct s3c2410_dma_client {
153 * internally used buffer structure to describe a queued or running
157 struct s3c2410_dma_buf;
158 struct s3c2410_dma_buf {
159 struct s3c2410_dma_buf *next;
160 int magic; /* magic */
161 int size; /* buffer size in bytes */
162 dma_addr_t data; /* start of DMA data */
163 dma_addr_t ptr; /* where the DMA got to [1] */
164 void *id; /* client's id */
167 /* [1] is this updated for both recv/send modes? */
169 struct s3c2410_dma_chan;
171 /* s3c2410_dma_cbfn_t
173 * buffer callback routine type
176 typedef void (*s3c2410_dma_cbfn_t)(struct s3c2410_dma_chan *,
178 enum s3c2410_dma_buffresult result);
180 typedef int (*s3c2410_dma_opfn_t)(struct s3c2410_dma_chan *,
181 enum s3c2410_chan_op );
183 struct s3c2410_dma_stats {
185 unsigned long timeout_longest;
186 unsigned long timeout_shortest;
187 unsigned long timeout_avg;
188 unsigned long timeout_failed;
191 struct s3c2410_dma_map;
193 /* struct s3c2410_dma_chan
195 * full state information for each DMA channel
198 struct s3c2410_dma_chan {
199 /* channel state flags and information */
200 unsigned char number; /* number of this dma channel */
201 unsigned char in_use; /* channel allocated */
202 unsigned char irq_claimed; /* irq claimed for channel */
203 unsigned char irq_enabled; /* irq enabled for channel */
204 unsigned char xfer_unit; /* size of an transfer */
208 enum s3c2410_dma_state state;
209 enum s3c2410_dma_loadst load_state;
210 struct s3c2410_dma_client *client;
212 /* channel configuration */
213 enum s3c2410_dmasrc source;
214 unsigned long dev_addr;
215 unsigned long load_timeout;
216 unsigned int flags; /* channel flags */
217 unsigned int hw_cfg; /* last hw config */
219 struct s3c24xx_dma_map *map; /* channel hw maps */
221 /* channel's hardware position and configuration */
222 void __iomem *regs; /* channels registers */
223 void __iomem *addr_reg; /* data address register */
224 unsigned int irq; /* channel irq */
225 unsigned long dcon; /* default value of DCON */
228 s3c2410_dma_cbfn_t callback_fn; /* buffer done callback */
229 s3c2410_dma_opfn_t op_fn; /* channel op callback */
231 /* stats gathering */
232 struct s3c2410_dma_stats *stats;
233 struct s3c2410_dma_stats stats_store;
235 /* buffer list and information */
236 struct s3c2410_dma_buf *curr; /* current dma buffer */
237 struct s3c2410_dma_buf *next; /* next buffer to load */
238 struct s3c2410_dma_buf *end; /* end of queue */
241 struct sys_device dev;
244 /* the currently allocated channel information */
245 extern struct s3c2410_dma_chan s3c2410_chans[];
247 /* note, we don't really use dma_device_t at the moment */
248 typedef unsigned long dma_device_t;
250 /* functions --------------------------------------------------------------- */
252 /* s3c2410_dma_request
254 * request a dma channel exclusivley
257 extern int s3c2410_dma_request(dmach_t channel,
258 struct s3c2410_dma_client *, void *dev);
263 * change the state of the dma channel
266 extern int s3c2410_dma_ctrl(dmach_t channel, enum s3c2410_chan_op op);
268 /* s3c2410_dma_setflags
270 * set the channel's flags to a given state
273 extern int s3c2410_dma_setflags(dmach_t channel,
278 * free the dma channel (will also abort any outstanding operations)
281 extern int s3c2410_dma_free(dmach_t channel, struct s3c2410_dma_client *);
283 /* s3c2410_dma_enqueue
285 * place the given buffer onto the queue of operations for the channel.
286 * The buffer must be allocated from dma coherent memory, or the Dcache/WB
287 * drained before the buffer is given to the DMA system.
290 extern int s3c2410_dma_enqueue(dmach_t channel, void *id,
291 dma_addr_t data, int size);
293 /* s3c2410_dma_config
295 * configure the dma channel
298 extern int s3c2410_dma_config(dmach_t channel, int xferunit, int dcon);
300 /* s3c2410_dma_devconfig
302 * configure the device we're talking to
305 extern int s3c2410_dma_devconfig(int channel, enum s3c2410_dmasrc source,
306 int hwcfg, unsigned long devaddr);
308 /* s3c2410_dma_getposition
310 * get the position that the dma transfer is currently at
313 extern int s3c2410_dma_getposition(dmach_t channel,
314 dma_addr_t *src, dma_addr_t *dest);
316 extern int s3c2410_dma_set_opfn(dmach_t, s3c2410_dma_opfn_t rtn);
317 extern int s3c2410_dma_set_buffdone_fn(dmach_t, s3c2410_dma_cbfn_t rtn);
319 /* DMA Register definitions */
321 #define S3C2410_DMA_DISRC (0x00)
322 #define S3C2410_DMA_DISRCC (0x04)
323 #define S3C2410_DMA_DIDST (0x08)
324 #define S3C2410_DMA_DIDSTC (0x0C)
325 #define S3C2410_DMA_DCON (0x10)
326 #define S3C2410_DMA_DSTAT (0x14)
327 #define S3C2410_DMA_DCSRC (0x18)
328 #define S3C2410_DMA_DCDST (0x1C)
329 #define S3C2410_DMA_DMASKTRIG (0x20)
330 #define S3C2412_DMA_DMAREQSEL (0x24)
331 #define S3C2443_DMA_DMAREQSEL (0x24)
333 #define S3C2410_DISRCC_INC (1<<0)
334 #define S3C2410_DISRCC_APB (1<<1)
336 #define S3C2410_DMASKTRIG_STOP (1<<2)
337 #define S3C2410_DMASKTRIG_ON (1<<1)
338 #define S3C2410_DMASKTRIG_SWTRIG (1<<0)
340 #define S3C2410_DCON_DEMAND (0<<31)
341 #define S3C2410_DCON_HANDSHAKE (1<<31)
342 #define S3C2410_DCON_SYNC_PCLK (0<<30)
343 #define S3C2410_DCON_SYNC_HCLK (1<<30)
345 #define S3C2410_DCON_INTREQ (1<<29)
347 #define S3C2410_DCON_CH0_XDREQ0 (0<<24)
348 #define S3C2410_DCON_CH0_UART0 (1<<24)
349 #define S3C2410_DCON_CH0_SDI (2<<24)
350 #define S3C2410_DCON_CH0_TIMER (3<<24)
351 #define S3C2410_DCON_CH0_USBEP1 (4<<24)
353 #define S3C2410_DCON_CH1_XDREQ1 (0<<24)
354 #define S3C2410_DCON_CH1_UART1 (1<<24)
355 #define S3C2410_DCON_CH1_I2SSDI (2<<24)
356 #define S3C2410_DCON_CH1_SPI (3<<24)
357 #define S3C2410_DCON_CH1_USBEP2 (4<<24)
359 #define S3C2410_DCON_CH2_I2SSDO (0<<24)
360 #define S3C2410_DCON_CH2_I2SSDI (1<<24)
361 #define S3C2410_DCON_CH2_SDI (2<<24)
362 #define S3C2410_DCON_CH2_TIMER (3<<24)
363 #define S3C2410_DCON_CH2_USBEP3 (4<<24)
365 #define S3C2410_DCON_CH3_UART2 (0<<24)
366 #define S3C2410_DCON_CH3_SDI (1<<24)
367 #define S3C2410_DCON_CH3_SPI (2<<24)
368 #define S3C2410_DCON_CH3_TIMER (3<<24)
369 #define S3C2410_DCON_CH3_USBEP4 (4<<24)
371 #define S3C2410_DCON_SRCSHIFT (24)
372 #define S3C2410_DCON_SRCMASK (7<<24)
374 #define S3C2410_DCON_BYTE (0<<20)
375 #define S3C2410_DCON_HALFWORD (1<<20)
376 #define S3C2410_DCON_WORD (2<<20)
378 #define S3C2410_DCON_AUTORELOAD (0<<22)
379 #define S3C2410_DCON_NORELOAD (1<<22)
380 #define S3C2410_DCON_HWTRIG (1<<23)
382 #ifdef CONFIG_CPU_S3C2440
383 #define S3C2440_DIDSTC_CHKINT (1<<2)
385 #define S3C2440_DCON_CH0_I2SSDO (5<<24)
386 #define S3C2440_DCON_CH0_PCMIN (6<<24)
388 #define S3C2440_DCON_CH1_PCMOUT (5<<24)
389 #define S3C2440_DCON_CH1_SDI (6<<24)
391 #define S3C2440_DCON_CH2_PCMIN (5<<24)
392 #define S3C2440_DCON_CH2_MICIN (6<<24)
394 #define S3C2440_DCON_CH3_MICIN (5<<24)
395 #define S3C2440_DCON_CH3_PCMOUT (6<<24)
398 #ifdef CONFIG_CPU_S3C2412
400 #define S3C2412_DMAREQSEL_SRC(x) ((x)<<1)
402 #define S3C2412_DMAREQSEL_HW (1)
404 #define S3C2412_DMAREQSEL_SPI0TX S3C2412_DMAREQSEL_SRC(0)
405 #define S3C2412_DMAREQSEL_SPI0RX S3C2412_DMAREQSEL_SRC(1)
406 #define S3C2412_DMAREQSEL_SPI1TX S3C2412_DMAREQSEL_SRC(2)
407 #define S3C2412_DMAREQSEL_SPI1RX S3C2412_DMAREQSEL_SRC(3)
408 #define S3C2412_DMAREQSEL_I2STX S3C2412_DMAREQSEL_SRC(4)
409 #define S3C2412_DMAREQSEL_I2SRX S3C2412_DMAREQSEL_SRC(5)
410 #define S3C2412_DMAREQSEL_TIMER S3C2412_DMAREQSEL_SRC(9)
411 #define S3C2412_DMAREQSEL_SDI S3C2412_DMAREQSEL_SRC(10)
412 #define S3C2412_DMAREQSEL_USBEP1 S3C2412_DMAREQSEL_SRC(13)
413 #define S3C2412_DMAREQSEL_USBEP2 S3C2412_DMAREQSEL_SRC(14)
414 #define S3C2412_DMAREQSEL_USBEP3 S3C2412_DMAREQSEL_SRC(15)
415 #define S3C2412_DMAREQSEL_USBEP4 S3C2412_DMAREQSEL_SRC(16)
416 #define S3C2412_DMAREQSEL_XDREQ0 S3C2412_DMAREQSEL_SRC(17)
417 #define S3C2412_DMAREQSEL_XDREQ1 S3C2412_DMAREQSEL_SRC(18)
418 #define S3C2412_DMAREQSEL_UART0_0 S3C2412_DMAREQSEL_SRC(19)
419 #define S3C2412_DMAREQSEL_UART0_1 S3C2412_DMAREQSEL_SRC(20)
420 #define S3C2412_DMAREQSEL_UART1_0 S3C2412_DMAREQSEL_SRC(21)
421 #define S3C2412_DMAREQSEL_UART1_1 S3C2412_DMAREQSEL_SRC(22)
422 #define S3C2412_DMAREQSEL_UART2_0 S3C2412_DMAREQSEL_SRC(23)
423 #define S3C2412_DMAREQSEL_UART2_1 S3C2412_DMAREQSEL_SRC(24)
427 #define S3C2443_DMAREQSEL_SRC(x) ((x)<<1)
429 #define S3C2443_DMAREQSEL_HW (1)
431 #define S3C2443_DMAREQSEL_SPI0TX S3C2443_DMAREQSEL_SRC(0)
432 #define S3C2443_DMAREQSEL_SPI0RX S3C2443_DMAREQSEL_SRC(1)
433 #define S3C2443_DMAREQSEL_SPI1TX S3C2443_DMAREQSEL_SRC(2)
434 #define S3C2443_DMAREQSEL_SPI1RX S3C2443_DMAREQSEL_SRC(3)
435 #define S3C2443_DMAREQSEL_I2STX S3C2443_DMAREQSEL_SRC(4)
436 #define S3C2443_DMAREQSEL_I2SRX S3C2443_DMAREQSEL_SRC(5)
437 #define S3C2443_DMAREQSEL_TIMER S3C2443_DMAREQSEL_SRC(9)
438 #define S3C2443_DMAREQSEL_SDI S3C2443_DMAREQSEL_SRC(10)
439 #define S3C2443_DMAREQSEL_XDREQ0 S3C2443_DMAREQSEL_SRC(17)
440 #define S3C2443_DMAREQSEL_XDREQ1 S3C2443_DMAREQSEL_SRC(18)
441 #define S3C2443_DMAREQSEL_UART0_0 S3C2443_DMAREQSEL_SRC(19)
442 #define S3C2443_DMAREQSEL_UART0_1 S3C2443_DMAREQSEL_SRC(20)
443 #define S3C2443_DMAREQSEL_UART1_0 S3C2443_DMAREQSEL_SRC(21)
444 #define S3C2443_DMAREQSEL_UART1_1 S3C2443_DMAREQSEL_SRC(22)
445 #define S3C2443_DMAREQSEL_UART2_0 S3C2443_DMAREQSEL_SRC(23)
446 #define S3C2443_DMAREQSEL_UART2_1 S3C2443_DMAREQSEL_SRC(24)
447 #define S3C2443_DMAREQSEL_UART3_0 S3C2443_DMAREQSEL_SRC(25)
448 #define S3C2443_DMAREQSEL_UART3_1 S3C2443_DMAREQSEL_SRC(26)
449 #define S3C2443_DMAREQSEL_PCMOUT S3C2443_DMAREQSEL_SRC(27)
450 #define S3C2443_DMAREQSEL_PCMIN S3C2443_DMAREQSEL_SRC(28)
451 #define S3C2443_DMAREQSEL_MICIN S3C2443_DMAREQSEL_SRC(29)
453 #endif /* __ASM_ARCH_DMA_H */