1 /* linux/include/asm-arm/arch-bast/dma.h
3 * Copyright (C) 2003,2004 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
6 * Samsung S3C2410X 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 * ??-May-2003 BJD Created file
14 * ??-Jun-2003 BJD Added more dma functionality to go with arch
15 * 10-Nov-2004 BJD Added sys_device support
18 #ifndef __ASM_ARCH_DMA_H
19 #define __ASM_ARCH_DMA_H __FILE__
21 #include <linux/config.h>
22 #include <linux/sysdev.h>
27 * This is the maximum DMA address(physical address) that can be DMAd to.
30 #define MAX_DMA_ADDRESS 0x20000000
31 #define MAX_DMA_TRANSFER_SIZE 0x100000 /* Data Unit is half word */
34 /* according to the samsung port, we cannot use the regular
35 * dma channels... we must therefore provide our own interface
36 * for DMA, and allow our drivers to use that.
39 #define MAX_DMA_CHANNELS 0
42 /* we have 4 dma channels */
43 #define S3C2410_DMA_CHANNELS (4)
51 } s3c2410_dma_state_t;
54 /* s3c2410_dma_loadst_t
56 * This represents the state of the DMA engine, wrt to the loaded / running
57 * transfers. Since we don't have any way of knowing exactly the state of
58 * the DMA transfers, we need to know the state to make decisions on wether
63 * There are no buffers loaded (the channel should be inactive)
67 * There is one buffer loaded, however it has not been confirmed to be
68 * loaded by the DMA engine. This may be because the channel is not
69 * yet running, or the DMA driver decided that it was too costly to
70 * sit and wait for it to happen.
72 * S3C2410_DMA_1RUNNING
74 * The buffer has been confirmed running, and not finisged
76 * S3C2410_DMA_1LOADED_1RUNNING
78 * There is a buffer waiting to be loaded by the DMA engine, and one
84 S3C2410_DMALOAD_1LOADED,
85 S3C2410_DMALOAD_1RUNNING,
86 S3C2410_DMALOAD_1LOADED_1RUNNING,
87 } s3c2410_dma_loadst_t;
93 } s3c2410_dma_buffresult_t;
96 typedef enum s3c2410_dmasrc_e s3c2410_dmasrc_t;
98 enum s3c2410_dmasrc_e {
99 S3C2410_DMASRC_HW, /* source is memory */
100 S3C2410_DMASRC_MEM /* source is hardware */
103 /* enum s3c2410_chan_op_e
105 * operation codes passed to the DMA code by the user, and also used
106 * to inform the current channel owner of any changes to the system state
109 enum s3c2410_chan_op_e {
113 S3C2410_DMAOP_RESUME,
115 S3C2410_DMAOP_TIMEOUT, /* internal signal to handler */
118 typedef enum s3c2410_chan_op_e s3c2410_chan_op_t;
122 #define S3C2410_DMAF_SLOW (1<<0) /* slow, so don't worry about
123 * waiting for reloads */
124 #define S3C2410_DMAF_AUTOSTART (1<<1) /* auto-start if buffer queued */
128 typedef struct s3c2410_dma_buf_s s3c2410_dma_buf_t;
130 struct s3c2410_dma_client {
134 typedef struct s3c2410_dma_client s3c2410_dma_client_t;
138 * internally used buffer structure to describe a queued or running
142 struct s3c2410_dma_buf_s {
143 s3c2410_dma_buf_t *next;
144 int magic; /* magic */
145 int size; /* buffer size in bytes */
146 dma_addr_t data; /* start of DMA data */
147 dma_addr_t ptr; /* where the DMA got to [1] */
148 void *id; /* client's id */
151 /* [1] is this updated for both recv/send modes? */
153 typedef struct s3c2410_dma_chan_s s3c2410_dma_chan_t;
155 /* s3c2410_dma_cbfn_t
157 * buffer callback routine type
160 typedef void (*s3c2410_dma_cbfn_t)(s3c2410_dma_chan_t *, void *buf, int size,
161 s3c2410_dma_buffresult_t result);
163 typedef int (*s3c2410_dma_opfn_t)(s3c2410_dma_chan_t *,
166 struct s3c2410_dma_stats_s {
168 unsigned long timeout_longest;
169 unsigned long timeout_shortest;
170 unsigned long timeout_avg;
171 unsigned long timeout_failed;
174 typedef struct s3c2410_dma_stats_s s3c2410_dma_stats_t;
176 /* struct s3c2410_dma_chan_s
178 * full state information for each DMA channel
181 struct s3c2410_dma_chan_s {
182 /* channel state flags and information */
183 unsigned char number; /* number of this dma channel */
184 unsigned char in_use; /* channel allocated */
185 unsigned char irq_claimed; /* irq claimed for channel */
186 unsigned char irq_enabled; /* irq enabled for channel */
187 unsigned char xfer_unit; /* size of an transfer */
191 s3c2410_dma_state_t state;
192 s3c2410_dma_loadst_t load_state;
193 s3c2410_dma_client_t *client;
195 /* channel configuration */
196 s3c2410_dmasrc_t source;
197 unsigned long dev_addr;
198 unsigned long load_timeout;
199 unsigned int flags; /* channel flags */
201 /* channel's hardware position and configuration */
202 void __iomem *regs; /* channels registers */
203 void __iomem *addr_reg; /* data address register */
204 unsigned int irq; /* channel irq */
205 unsigned long dcon; /* default value of DCON */
208 s3c2410_dma_cbfn_t callback_fn; /* buffer done callback */
209 s3c2410_dma_opfn_t op_fn; /* channel operation callback */
211 /* stats gathering */
212 s3c2410_dma_stats_t *stats;
213 s3c2410_dma_stats_t stats_store;
215 /* buffer list and information */
216 s3c2410_dma_buf_t *curr; /* current dma buffer */
217 s3c2410_dma_buf_t *next; /* next buffer to load */
218 s3c2410_dma_buf_t *end; /* end of queue */
221 struct sys_device dev;
224 /* the currently allocated channel information */
225 extern s3c2410_dma_chan_t s3c2410_chans[];
227 /* note, we don't really use dma_device_t at the moment */
228 typedef unsigned long dma_device_t;
230 /* functions --------------------------------------------------------------- */
232 /* s3c2410_dma_request
234 * request a dma channel exclusivley
237 extern int s3c2410_dma_request(dmach_t channel,
238 s3c2410_dma_client_t *, void *dev);
243 * change the state of the dma channel
246 extern int s3c2410_dma_ctrl(dmach_t channel, s3c2410_chan_op_t op);
248 /* s3c2410_dma_setflags
250 * set the channel's flags to a given state
253 extern int s3c2410_dma_setflags(dmach_t channel,
258 * free the dma channel (will also abort any outstanding operations)
261 extern int s3c2410_dma_free(dmach_t channel, s3c2410_dma_client_t *);
263 /* s3c2410_dma_enqueue
265 * place the given buffer onto the queue of operations for the channel.
266 * The buffer must be allocated from dma coherent memory, or the Dcache/WB
267 * drained before the buffer is given to the DMA system.
270 extern int s3c2410_dma_enqueue(dmach_t channel, void *id,
271 dma_addr_t data, int size);
273 /* s3c2410_dma_config
275 * configure the dma channel
278 extern int s3c2410_dma_config(dmach_t channel, int xferunit, int dcon);
280 /* s3c2410_dma_devconfig
282 * configure the device we're talking to
285 extern int s3c2410_dma_devconfig(int channel, s3c2410_dmasrc_t source,
286 int hwcfg, unsigned long devaddr);
288 /* s3c2410_dma_getposition
290 * get the position that the dma transfer is currently at
293 extern int s3c2410_dma_getposition(dmach_t channel,
294 dma_addr_t *src, dma_addr_t *dest);
296 extern int s3c2410_dma_set_opfn(dmach_t, s3c2410_dma_opfn_t rtn);
297 extern int s3c2410_dma_set_buffdone_fn(dmach_t, s3c2410_dma_cbfn_t rtn);
299 /* DMA Register definitions */
301 #define S3C2410_DMA_DISRC (0x00)
302 #define S3C2410_DMA_DISRCC (0x04)
303 #define S3C2410_DMA_DIDST (0x08)
304 #define S3C2410_DMA_DIDSTC (0x0C)
305 #define S3C2410_DMA_DCON (0x10)
306 #define S3C2410_DMA_DSTAT (0x14)
307 #define S3C2410_DMA_DCSRC (0x18)
308 #define S3C2410_DMA_DCDST (0x1C)
309 #define S3C2410_DMA_DMASKTRIG (0x20)
311 #define S3C2410_DISRCC_INC (1<<0)
312 #define S3C2410_DISRCC_APB (1<<1)
314 #define S3C2410_DMASKTRIG_STOP (1<<2)
315 #define S3C2410_DMASKTRIG_ON (1<<1)
316 #define S3C2410_DMASKTRIG_SWTRIG (1<<0)
318 #define S3C2410_DCON_DEMAND (0<<31)
319 #define S3C2410_DCON_HANDSHAKE (1<<31)
320 #define S3C2410_DCON_SYNC_PCLK (0<<30)
321 #define S3C2410_DCON_SYNC_HCLK (1<<30)
323 #define S3C2410_DCON_INTREQ (1<<29)
325 #define S3C2410_DCON_CH0_XDREQ0 (0<<24)
326 #define S3C2410_DCON_CH0_UART0 (1<<24)
327 #define S3C2410_DCON_CH0_SDI (2<<24)
328 #define S3C2410_DCON_CH0_TIMER (3<<24)
329 #define S3C2410_DCON_CH0_USBEP1 (4<<24)
331 #define S3C2410_DCON_CH1_XDREQ1 (0<<24)
332 #define S3C2410_DCON_CH1_UART1 (1<<24)
333 #define S3C2410_DCON_CH1_I2SSDI (2<<24)
334 #define S3C2410_DCON_CH1_SPI (3<<24)
335 #define S3C2410_DCON_CH1_USBEP2 (4<<24)
337 #define S3C2410_DCON_CH2_I2SSDO (0<<24)
338 #define S3C2410_DCON_CH2_I2SSDI (1<<24)
339 #define S3C2410_DCON_CH2_SDI (2<<24)
340 #define S3C2410_DCON_CH2_TIMER (3<<24)
341 #define S3C2410_DCON_CH2_USBEP3 (4<<24)
343 #define S3C2410_DCON_CH3_UART2 (0<<24)
344 #define S3C2410_DCON_CH3_SDI (1<<24)
345 #define S3C2410_DCON_CH3_SPI (2<<24)
346 #define S3C2410_DCON_CH3_TIMER (3<<24)
347 #define S3C2410_DCON_CH3_USBEP4 (4<<24)
349 #define S3C2410_DCON_SRCSHIFT (24)
350 #define S3C2410_DCON_SRCMASK (7<<24)
352 #define S3C2410_DCON_BYTE (0<<20)
353 #define S3C2410_DCON_HALFWORD (1<<20)
354 #define S3C2410_DCON_WORD (2<<20)
356 #define S3C2410_DCON_AUTORELOAD (0<<22)
357 #define S3C2410_DCON_NORELOAD (1<<22)
358 #define S3C2410_DCON_HWTRIG (1<<23)
360 #ifdef CONFIG_CPU_S3C2440
361 #define S3C2440_DIDSTC_CHKINT (1<<2)
363 #define S3C2440_DCON_CH0_I2SSDO (5<<24)
364 #define S3C2440_DCON_CH0_PCMIN (6<<24)
366 #define S3C2440_DCON_CH1_PCMOUT (5<<24)
367 #define S3C2440_DCON_CH1_SDI (6<<24)
369 #define S3C2440_DCON_CH2_PCMIN (5<<24)
370 #define S3C2440_DCON_CH2_MICIN (6<<24)
372 #define S3C2440_DCON_CH3_MICIN (5<<24)
373 #define S3C2440_DCON_CH3_PCMOUT (6<<24)
376 #endif /* __ASM_ARCH_DMA_H */