aboutsummaryrefslogtreecommitdiff
path: root/include/asm-arm/arch-s3c2410/dma.h
blob: 46e65409fcc5b7635b35d72a02590b4868152081 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
/* 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 */

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_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 */

	/* 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 */
	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 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 */