include/asm-arm/arch-s3c2410/dma.h

   1 /* linux/include/asm-arm/arch-s3c2410/dma.h
   2  *
   3  * Copyright (C) 2003,2004,2006 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * Samsung S3C241XX DMA support
   7  *
   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.
  11 */
  12
  13 #ifndef __ASM_ARCH_DMA_H
  14 #define __ASM_ARCH_DMA_H __FILE__
  15
  16 #include <linux/sysdev.h>
  17 #include <asm/hardware.h>
  18
  19 /*
  20  * This is the maximum DMA address(physical address) that can be DMAd to.
  21  *
  22  */
  23 #define MAX_DMA_ADDRESS         0x40000000
  24 #define MAX_DMA_TRANSFER_SIZE   0x100000 /* Data Unit is half word  */
  25
  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.
  30 */
  31
  32 enum dma_ch {
  33         DMACH_XD0,
  34         DMACH_XD1,
  35         DMACH_SDI,
  36         DMACH_SPI0,
  37         DMACH_SPI1,
  38         DMACH_UART0,
  39         DMACH_UART1,
  40         DMACH_UART2,
  41         DMACH_TIMER,
  42         DMACH_I2S_IN,
  43         DMACH_I2S_OUT,
  44         DMACH_PCM_IN,
  45         DMACH_PCM_OUT,
  46         DMACH_MIC_IN,
  47         DMACH_USB_EP1,
  48         DMACH_USB_EP2,
  49         DMACH_USB_EP3,
  50         DMACH_USB_EP4,
  51         DMACH_UART0_SRC2,       /* s3c2412 second uart sources */
  52         DMACH_UART1_SRC2,
  53         DMACH_UART2_SRC2,
  54         DMACH_UART3,            /* s3c2443 has extra uart */
  55         DMACH_UART3_SRC2,
  56         DMACH_MAX,              /* the end entry */
  57 };
  58
  59 #define DMACH_LOW_LEVEL (1<<28) /* use this to specifiy hardware ch no */
  60
  61 /* we have 4 dma channels */
  62 #ifndef CONFIG_CPU_S3C2443
  63 #define S3C2410_DMA_CHANNELS            (4)
  64 #else
  65 #define S3C2410_DMA_CHANNELS            (6)
  66 #endif
  67
  68 /* types */
  69
  70 enum s3c2410_dma_state {
  71         S3C2410_DMA_IDLE,
  72         S3C2410_DMA_RUNNING,
  73         S3C2410_DMA_PAUSED
  74 };
  75
  76
  77 /* enum s3c2410_dma_loadst
  78  *
  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
  82  * we can
  83  *
  84  * S3C2410_DMA_NONE
  85  *
  86  * There are no buffers loaded (the channel should be inactive)
  87  *
  88  * S3C2410_DMA_1LOADED
  89  *
  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.
  94  *
  95  * S3C2410_DMA_1RUNNING
  96  *
  97  * The buffer has been confirmed running, and not finisged
  98  *
  99  * S3C2410_DMA_1LOADED_1RUNNING
 100  *
 101  * There is a buffer waiting to be loaded by the DMA engine, and one
 102  * currently running.
 103 */
 104
 105 enum s3c2410_dma_loadst {
 106         S3C2410_DMALOAD_NONE,
 107         S3C2410_DMALOAD_1LOADED,
 108         S3C2410_DMALOAD_1RUNNING,
 109         S3C2410_DMALOAD_1LOADED_1RUNNING,
 110 };
 111
 112 enum s3c2410_dma_buffresult {
 113         S3C2410_RES_OK,
 114         S3C2410_RES_ERR,
 115         S3C2410_RES_ABORT
 116 };
 117
 118 enum s3c2410_dmasrc {
 119         S3C2410_DMASRC_HW,              /* source is memory */
 120         S3C2410_DMASRC_MEM              /* source is hardware */
 121 };
 122
 123 /* enum s3c2410_chan_op
 124  *
 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
 127 */
 128
 129 enum s3c2410_chan_op {
 130         S3C2410_DMAOP_START,
 131         S3C2410_DMAOP_STOP,
 132         S3C2410_DMAOP_PAUSE,
 133         S3C2410_DMAOP_RESUME,
 134         S3C2410_DMAOP_FLUSH,
 135         S3C2410_DMAOP_TIMEOUT,          /* internal signal to handler */
 136         S3C2410_DMAOP_STARTED,          /* indicate channel started */
 137 };
 138
 139 /* flags */
 140
 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 */
 144
 145 /* dma buffer */
 146
 147 struct s3c2410_dma_client {
 148         char                *name;
 149 };
 150
 151 /* s3c2410_dma_buf_s
 152  *
 153  * internally used buffer structure to describe a queued or running
 154  * buffer.
 155 */
 156
 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 */
 165 };
 166
 167 /* [1] is this updated for both recv/send modes? */
 168
 169 struct s3c2410_dma_chan;
 170
 171 /* s3c2410_dma_cbfn_t
 172  *
 173  * buffer callback routine type
 174 */
 175
 176 typedef void (*s3c2410_dma_cbfn_t)(struct s3c2410_dma_chan *,
 177                                    void *buf, int size,
 178                                    enum s3c2410_dma_buffresult result);
 179
 180 typedef int  (*s3c2410_dma_opfn_t)(struct s3c2410_dma_chan *,
 181                                    enum s3c2410_chan_op );
 182
 183 struct s3c2410_dma_stats {
 184         unsigned long           loads;
 185         unsigned long           timeout_longest;
 186         unsigned long           timeout_shortest;
 187         unsigned long           timeout_avg;
 188         unsigned long           timeout_failed;
 189 };
 190
 191 struct s3c2410_dma_map;
 192
 193 /* struct s3c2410_dma_chan
 194  *
 195  * full state information for each DMA channel
 196 */
 197
 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 */
 205
 206         /* channel state */
 207
 208         enum s3c2410_dma_state   state;
 209         enum s3c2410_dma_loadst  load_state;
 210         struct s3c2410_dma_client *client;
 211
 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
 218         struct s3c24xx_dma_map  *map;           /* channel hw maps */
 219
 220         /* channel's hardware position and configuration */
 221         void __iomem            *regs;          /* channels registers */
 222         void __iomem            *addr_reg;      /* data address register */
 223         unsigned int             irq;           /* channel irq */
 224         unsigned long            dcon;          /* default value of DCON */
 225
 226         /* driver handles */
 227         s3c2410_dma_cbfn_t       callback_fn;   /* buffer done callback */
 228         s3c2410_dma_opfn_t       op_fn;         /* channel op callback */
 229
 230         /* stats gathering */
 231         struct s3c2410_dma_stats *stats;
 232         struct s3c2410_dma_stats  stats_store;
 233
 234         /* buffer list and information */
 235         struct s3c2410_dma_buf  *curr;          /* current dma buffer */
 236         struct s3c2410_dma_buf  *next;          /* next buffer to load */
 237         struct s3c2410_dma_buf  *end;           /* end of queue */
 238
 239         /* system device */
 240         struct sys_device       dev;
 241 };
 242
 243 /* the currently allocated channel information */
 244 extern struct s3c2410_dma_chan s3c2410_chans[];
 245
 246 /* note, we don't really use dma_device_t at the moment */
 247 typedef unsigned long dma_device_t;
 248
 249 /* functions --------------------------------------------------------------- */
 250
 251 /* s3c2410_dma_request
 252  *
 253  * request a dma channel exclusivley
 254 */
 255
 256 extern int s3c2410_dma_request(dmach_t channel,
 257                                struct s3c2410_dma_client *, void *dev);
 258
 259
 260 /* s3c2410_dma_ctrl
 261  *
 262  * change the state of the dma channel
 263 */
 264
 265 extern int s3c2410_dma_ctrl(dmach_t channel, enum s3c2410_chan_op op);
 266
 267 /* s3c2410_dma_setflags
 268  *
 269  * set the channel's flags to a given state
 270 */
 271
 272 extern int s3c2410_dma_setflags(dmach_t channel,
 273                                 unsigned int flags);
 274
 275 /* s3c2410_dma_free
 276  *
 277  * free the dma channel (will also abort any outstanding operations)
 278 */
 279
 280 extern int s3c2410_dma_free(dmach_t channel, struct s3c2410_dma_client *);
 281
 282 /* s3c2410_dma_enqueue
 283  *
 284  * place the given buffer onto the queue of operations for the channel.
 285  * The buffer must be allocated from dma coherent memory, or the Dcache/WB
 286  * drained before the buffer is given to the DMA system.
 287 */
 288
 289 extern int s3c2410_dma_enqueue(dmach_t channel, void *id,
 290                                dma_addr_t data, int size);
 291
 292 /* s3c2410_dma_config
 293  *
 294  * configure the dma channel
 295 */
 296
 297 extern int s3c2410_dma_config(dmach_t channel, int xferunit, int dcon);
 298
 299 /* s3c2410_dma_devconfig
 300  *
 301  * configure the device we're talking to
 302 */
 303
 304 extern int s3c2410_dma_devconfig(int channel, enum s3c2410_dmasrc source,
 305                                  int hwcfg, unsigned long devaddr);
 306
 307 /* s3c2410_dma_getposition
 308  *
 309  * get the position that the dma transfer is currently at
 310 */
 311
 312 extern int s3c2410_dma_getposition(dmach_t channel,
 313                                    dma_addr_t *src, dma_addr_t *dest);
 314
 315 extern int s3c2410_dma_set_opfn(dmach_t, s3c2410_dma_opfn_t rtn);
 316 extern int s3c2410_dma_set_buffdone_fn(dmach_t, s3c2410_dma_cbfn_t rtn);
 317
 318 /* DMA Register definitions */
 319
 320 #define S3C2410_DMA_DISRC       (0x00)
 321 #define S3C2410_DMA_DISRCC      (0x04)
 322 #define S3C2410_DMA_DIDST       (0x08)
 323 #define S3C2410_DMA_DIDSTC      (0x0C)
 324 #define S3C2410_DMA_DCON        (0x10)
 325 #define S3C2410_DMA_DSTAT       (0x14)
 326 #define S3C2410_DMA_DCSRC       (0x18)
 327 #define S3C2410_DMA_DCDST       (0x1C)
 328 #define S3C2410_DMA_DMASKTRIG   (0x20)
 329 #define S3C2412_DMA_DMAREQSEL   (0x24)
 330 #define S3C2443_DMA_DMAREQSEL   (0x24)
 331
 332 #define S3C2410_DISRCC_INC      (1<<0)
 333 #define S3C2410_DISRCC_APB      (1<<1)
 334
 335 #define S3C2410_DMASKTRIG_STOP   (1<<2)
 336 #define S3C2410_DMASKTRIG_ON     (1<<1)
 337 #define S3C2410_DMASKTRIG_SWTRIG (1<<0)
 338
 339 #define S3C2410_DCON_DEMAND     (0<<31)
 340 #define S3C2410_DCON_HANDSHAKE  (1<<31)
 341 #define S3C2410_DCON_SYNC_PCLK  (0<<30)
 342 #define S3C2410_DCON_SYNC_HCLK  (1<<30)
 343
 344 #define S3C2410_DCON_INTREQ     (1<<29)
 345
 346 #define S3C2410_DCON_CH0_XDREQ0 (0<<24)
 347 #define S3C2410_DCON_CH0_UART0  (1<<24)
 348 #define S3C2410_DCON_CH0_SDI    (2<<24)
 349 #define S3C2410_DCON_CH0_TIMER  (3<<24)
 350 #define S3C2410_DCON_CH0_USBEP1 (4<<24)
 351
 352 #define S3C2410_DCON_CH1_XDREQ1 (0<<24)
 353 #define S3C2410_DCON_CH1_UART1  (1<<24)
 354 #define S3C2410_DCON_CH1_I2SSDI (2<<24)
 355 #define S3C2410_DCON_CH1_SPI    (3<<24)
 356 #define S3C2410_DCON_CH1_USBEP2 (4<<24)
 357
 358 #define S3C2410_DCON_CH2_I2SSDO (0<<24)
 359 #define S3C2410_DCON_CH2_I2SSDI (1<<24)
 360 #define S3C2410_DCON_CH2_SDI    (2<<24)
 361 #define S3C2410_DCON_CH2_TIMER  (3<<24)
 362 #define S3C2410_DCON_CH2_USBEP3 (4<<24)
 363
 364 #define S3C2410_DCON_CH3_UART2  (0<<24)
 365 #define S3C2410_DCON_CH3_SDI    (1<<24)
 366 #define S3C2410_DCON_CH3_SPI    (2<<24)
 367 #define S3C2410_DCON_CH3_TIMER  (3<<24)
 368 #define S3C2410_DCON_CH3_USBEP4 (4<<24)
 369
 370 #define S3C2410_DCON_SRCSHIFT   (24)
 371 #define S3C2410_DCON_SRCMASK    (7<<24)
 372
 373 #define S3C2410_DCON_BYTE       (0<<20)
 374 #define S3C2410_DCON_HALFWORD   (1<<20)
 375 #define S3C2410_DCON_WORD       (2<<20)
 376
 377 #define S3C2410_DCON_AUTORELOAD (0<<22)
 378 #define S3C2410_DCON_NORELOAD   (1<<22)
 379 #define S3C2410_DCON_HWTRIG     (1<<23)
 380
 381 #ifdef CONFIG_CPU_S3C2440
 382 #define S3C2440_DIDSTC_CHKINT   (1<<2)
 383
 384 #define S3C2440_DCON_CH0_I2SSDO (5<<24)
 385 #define S3C2440_DCON_CH0_PCMIN  (6<<24)
 386
 387 #define S3C2440_DCON_CH1_PCMOUT (5<<24)
 388 #define S3C2440_DCON_CH1_SDI    (6<<24)
 389
 390 #define S3C2440_DCON_CH2_PCMIN  (5<<24)
 391 #define S3C2440_DCON_CH2_MICIN  (6<<24)
 392
 393 #define S3C2440_DCON_CH3_MICIN  (5<<24)
 394 #define S3C2440_DCON_CH3_PCMOUT (6<<24)
 395 #endif
 396
 397 #ifdef CONFIG_CPU_S3C2412
 398
 399 #define S3C2412_DMAREQSEL_SRC(x)        ((x)<<1)
 400
 401 #define S3C2412_DMAREQSEL_HW            (1)
 402
 403 #define S3C2412_DMAREQSEL_SPI0TX        S3C2412_DMAREQSEL_SRC(0)
 404 #define S3C2412_DMAREQSEL_SPI0RX        S3C2412_DMAREQSEL_SRC(1)
 405 #define S3C2412_DMAREQSEL_SPI1TX        S3C2412_DMAREQSEL_SRC(2)
 406 #define S3C2412_DMAREQSEL_SPI1RX        S3C2412_DMAREQSEL_SRC(3)
 407 #define S3C2412_DMAREQSEL_I2STX         S3C2412_DMAREQSEL_SRC(4)
 408 #define S3C2412_DMAREQSEL_I2SRX         S3C2412_DMAREQSEL_SRC(5)
 409 #define S3C2412_DMAREQSEL_TIMER         S3C2412_DMAREQSEL_SRC(9)
 410 #define S3C2412_DMAREQSEL_SDI           S3C2412_DMAREQSEL_SRC(10)
 411 #define S3C2412_DMAREQSEL_USBEP1        S3C2412_DMAREQSEL_SRC(13)
 412 #define S3C2412_DMAREQSEL_USBEP2        S3C2412_DMAREQSEL_SRC(14)
 413 #define S3C2412_DMAREQSEL_USBEP3        S3C2412_DMAREQSEL_SRC(15)
 414 #define S3C2412_DMAREQSEL_USBEP4        S3C2412_DMAREQSEL_SRC(16)
 415 #define S3C2412_DMAREQSEL_XDREQ0        S3C2412_DMAREQSEL_SRC(17)
 416 #define S3C2412_DMAREQSEL_XDREQ1        S3C2412_DMAREQSEL_SRC(18)
 417 #define S3C2412_DMAREQSEL_UART0_0       S3C2412_DMAREQSEL_SRC(19)
 418 #define S3C2412_DMAREQSEL_UART0_1       S3C2412_DMAREQSEL_SRC(20)
 419 #define S3C2412_DMAREQSEL_UART1_0       S3C2412_DMAREQSEL_SRC(21)
 420 #define S3C2412_DMAREQSEL_UART1_1       S3C2412_DMAREQSEL_SRC(22)
 421 #define S3C2412_DMAREQSEL_UART2_0       S3C2412_DMAREQSEL_SRC(23)
 422 #define S3C2412_DMAREQSEL_UART2_1       S3C2412_DMAREQSEL_SRC(24)
 423
 424 #endif
 425
 426 #define S3C2443_DMAREQSEL_SRC(x)        ((x)<<1)
 427
 428 #define S3C2443_DMAREQSEL_HW            (1)
 429
 430 #define S3C2443_DMAREQSEL_SPI0TX        S3C2443_DMAREQSEL_SRC(0)
 431 #define S3C2443_DMAREQSEL_SPI0RX        S3C2443_DMAREQSEL_SRC(1)
 432 #define S3C2443_DMAREQSEL_SPI1TX        S3C2443_DMAREQSEL_SRC(2)
 433 #define S3C2443_DMAREQSEL_SPI1RX        S3C2443_DMAREQSEL_SRC(3)
 434 #define S3C2443_DMAREQSEL_I2STX         S3C2443_DMAREQSEL_SRC(4)
 435 #define S3C2443_DMAREQSEL_I2SRX         S3C2443_DMAREQSEL_SRC(5)
 436 #define S3C2443_DMAREQSEL_TIMER         S3C2443_DMAREQSEL_SRC(9)
 437 #define S3C2443_DMAREQSEL_SDI           S3C2443_DMAREQSEL_SRC(10)
 438 #define S3C2443_DMAREQSEL_XDREQ0        S3C2443_DMAREQSEL_SRC(17)
 439 #define S3C2443_DMAREQSEL_XDREQ1        S3C2443_DMAREQSEL_SRC(18)
 440 #define S3C2443_DMAREQSEL_UART0_0       S3C2443_DMAREQSEL_SRC(19)
 441 #define S3C2443_DMAREQSEL_UART0_1       S3C2443_DMAREQSEL_SRC(20)
 442 #define S3C2443_DMAREQSEL_UART1_0       S3C2443_DMAREQSEL_SRC(21)
 443 #define S3C2443_DMAREQSEL_UART1_1       S3C2443_DMAREQSEL_SRC(22)
 444 #define S3C2443_DMAREQSEL_UART2_0       S3C2443_DMAREQSEL_SRC(23)
 445 #define S3C2443_DMAREQSEL_UART2_1       S3C2443_DMAREQSEL_SRC(24)
 446 #define S3C2443_DMAREQSEL_UART3_0       S3C2443_DMAREQSEL_SRC(25)
 447 #define S3C2443_DMAREQSEL_UART3_1       S3C2443_DMAREQSEL_SRC(26)
 448 #define S3C2443_DMAREQSEL_PCMOUT        S3C2443_DMAREQSEL_SRC(27)
 449 #define S3C2443_DMAREQSEL_PCMIN         S3C2443_DMAREQSEL_SRC(28)
 450 #define S3C2443_DMAREQSEL_MICIN         S3C2443_DMAREQSEL_SRC(29)
 451
 452 #endif /* __ASM_ARCH_DMA_H */