arch/cris/arch-v32/drivers/sync_serial.c

   1 /*
   2  * Simple synchronous serial port driver for ETRAX FS and Artpec-3.
   3  *
   4  * Copyright (c) 2005 Axis Communications AB
   5  *
   6  * Author: Mikael Starvik
   7  *
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/errno.h>
  14 #include <linux/major.h>
  15 #include <linux/sched.h>
  16 #include <linux/slab.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/poll.h>
  19 #include <linux/init.h>
  20 #include <linux/timer.h>
  21 #include <linux/spinlock.h>
  22
  23 #include <asm/io.h>
  24 #include <dma.h>
  25 #include <pinmux.h>
  26 #include <hwregs/reg_rdwr.h>
  27 #include <hwregs/sser_defs.h>
  28 #include <hwregs/dma_defs.h>
  29 #include <hwregs/dma.h>
  30 #include <hwregs/intr_vect_defs.h>
  31 #include <hwregs/intr_vect.h>
  32 #include <hwregs/reg_map.h>
  33 #include <asm/sync_serial.h>
  34
  35
  36 /* The receiver is a bit tricky beacuse of the continuous stream of data.*/
  37 /*                                                                       */
  38 /* Three DMA descriptors are linked together. Each DMA descriptor is     */
  39 /* responsible for port->bufchunk of a common buffer.                    */
  40 /*                                                                       */
  41 /* +---------------------------------------------+                       */
  42 /* |   +----------+   +----------+   +----------+ |                      */
  43 /* +-> | Descr[0] |-->| Descr[1] |-->| Descr[2] |-+                      */
  44 /*     +----------+   +----------+   +----------+                        */
  45 /*         |            |              |                                 */
  46 /*         v            v              v                                 */
  47 /*   +-------------------------------------+                             */
  48 /*   |        BUFFER                       |                             */
  49 /*   +-------------------------------------+                             */
  50 /*      |<- data_avail ->|                                               */
  51 /*    readp          writep                                              */
  52 /*                                                                       */
  53 /* If the application keeps up the pace readp will be right after writep.*/
  54 /* If the application can't keep the pace we have to throw away data.    */
  55 /* The idea is that readp should be ready with the data pointed out by   */
  56 /* Descr[i] when the DMA has filled in Descr[i+1].                       */
  57 /* Otherwise we will discard                                             */
  58 /* the rest of the data pointed out by Descr1 and set readp to the start */
  59 /* of Descr2                                                             */
  60
  61 #define SYNC_SERIAL_MAJOR 125
  62
  63 /* IN_BUFFER_SIZE should be a multiple of 6 to make sure that 24 bit */
  64 /* words can be handled */
  65 #define IN_BUFFER_SIZE 12288
  66 #define IN_DESCR_SIZE 256
  67 #define NBR_IN_DESCR (IN_BUFFER_SIZE/IN_DESCR_SIZE)
  68
  69 #define OUT_BUFFER_SIZE 1024*8
  70 #define NBR_OUT_DESCR 8
  71
  72 #define DEFAULT_FRAME_RATE 0
  73 #define DEFAULT_WORD_RATE 7
  74
  75 /* NOTE: Enabling some debug will likely cause overrun or underrun,
  76  * especially if manual mode is use.
  77  */
  78 #define DEBUG(x)
  79 #define DEBUGREAD(x)
  80 #define DEBUGWRITE(x)
  81 #define DEBUGPOLL(x)
  82 #define DEBUGRXINT(x)
  83 #define DEBUGTXINT(x)
  84 #define DEBUGTRDMA(x)
  85 #define DEBUGOUTBUF(x)
  86
  87 typedef struct sync_port
  88 {
  89         reg_scope_instances regi_sser;
  90         reg_scope_instances regi_dmain;
  91         reg_scope_instances regi_dmaout;
  92
  93         char started; /* 1 if port has been started */
  94         char port_nbr; /* Port 0 or 1 */
  95         char busy; /* 1 if port is busy */
  96
  97         char enabled;  /* 1 if port is enabled */
  98         char use_dma;  /* 1 if port uses dma */
  99         char tr_running;
 100
 101         char init_irqs;
 102         int output;
 103         int input;
 104
 105         /* Next byte to be read by application */
 106         volatile unsigned char *volatile readp;
 107         /* Next byte to be written by etrax */
 108         volatile unsigned char *volatile writep;
 109
 110         unsigned int in_buffer_size;
 111         unsigned int inbufchunk;
 112         unsigned char out_buffer[OUT_BUFFER_SIZE] __attribute__ ((aligned(32)));
 113         unsigned char in_buffer[IN_BUFFER_SIZE]__attribute__ ((aligned(32)));
 114         unsigned char flip[IN_BUFFER_SIZE] __attribute__ ((aligned(32)));
 115         struct dma_descr_data* next_rx_desc;
 116         struct dma_descr_data* prev_rx_desc;
 117
 118         /* Pointer to the first available descriptor in the ring,
 119          * unless active_tr_descr == catch_tr_descr and a dma
 120          * transfer is active */
 121         struct dma_descr_data *active_tr_descr;
 122
 123         /* Pointer to the first allocated descriptor in the ring */
 124         struct dma_descr_data *catch_tr_descr;
 125
 126         /* Pointer to the descriptor with the current end-of-list */
 127         struct dma_descr_data *prev_tr_descr;
 128         int full;
 129
 130         /* Pointer to the first byte being read by DMA
 131          * or current position in out_buffer if not using DMA. */
 132         unsigned char *out_rd_ptr;
 133
 134         /* Number of bytes currently locked for being read by DMA */
 135         int out_buf_count;
 136
 137         dma_descr_data in_descr[NBR_IN_DESCR] __attribute__ ((__aligned__(16)));
 138         dma_descr_context in_context __attribute__ ((__aligned__(32)));
 139         dma_descr_data out_descr[NBR_OUT_DESCR]
 140                 __attribute__ ((__aligned__(16)));
 141         dma_descr_context out_context __attribute__ ((__aligned__(32)));
 142         wait_queue_head_t out_wait_q;
 143         wait_queue_head_t in_wait_q;
 144
 145         spinlock_t lock;
 146 } sync_port;
 147
 148 static int etrax_sync_serial_init(void);
 149 static void initialize_port(int portnbr);
 150 static inline int sync_data_avail(struct sync_port *port);
 151
 152 static int sync_serial_open(struct inode *, struct file*);
 153 static int sync_serial_release(struct inode*, struct file*);
 154 static unsigned int sync_serial_poll(struct file *filp, poll_table *wait);
 155
 156 static int sync_serial_ioctl(struct inode*, struct file*,
 157                              unsigned int cmd, unsigned long arg);
 158 static ssize_t sync_serial_write(struct file * file, const char * buf,
 159                                  size_t count, loff_t *ppos);
 160 static ssize_t sync_serial_read(struct file *file, char *buf,
 161                                 size_t count, loff_t *ppos);
 162
 163 #if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
 164      defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
 165     (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
 166      defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))
 167 #define SYNC_SER_DMA
 168 #endif
 169
 170 static void send_word(sync_port* port);
 171 static void start_dma_out(struct sync_port *port, const char *data, int count);
 172 static void start_dma_in(sync_port* port);
 173 #ifdef SYNC_SER_DMA
 174 static irqreturn_t tr_interrupt(int irq, void *dev_id);
 175 static irqreturn_t rx_interrupt(int irq, void *dev_id);
 176 #endif
 177
 178 #if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
 179      !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
 180     (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
 181      !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))
 182 #define SYNC_SER_MANUAL
 183 #endif
 184 #ifdef SYNC_SER_MANUAL
 185 static irqreturn_t manual_interrupt(int irq, void *dev_id);
 186 #endif
 187
 188 #ifdef CONFIG_ETRAXFS   /* ETRAX FS */
 189 #define OUT_DMA_NBR 4
 190 #define IN_DMA_NBR 5
 191 #define PINMUX_SSER pinmux_sser0
 192 #define SYNCSER_INST regi_sser0
 193 #define SYNCSER_INTR_VECT SSER0_INTR_VECT
 194 #define OUT_DMA_INST regi_dma4
 195 #define IN_DMA_INST regi_dma5
 196 #define DMA_OUT_INTR_VECT DMA4_INTR_VECT
 197 #define DMA_IN_INTR_VECT DMA5_INTR_VECT
 198 #define REQ_DMA_SYNCSER dma_sser0
 199 #else                   /* Artpec-3 */
 200 #define OUT_DMA_NBR 6
 201 #define IN_DMA_NBR 7
 202 #define PINMUX_SSER pinmux_sser
 203 #define SYNCSER_INST regi_sser
 204 #define SYNCSER_INTR_VECT SSER_INTR_VECT
 205 #define OUT_DMA_INST regi_dma6
 206 #define IN_DMA_INST regi_dma7
 207 #define DMA_OUT_INTR_VECT DMA6_INTR_VECT
 208 #define DMA_IN_INTR_VECT DMA7_INTR_VECT
 209 #define REQ_DMA_SYNCSER dma_sser
 210 #endif
 211
 212 /* The ports */
 213 static struct sync_port ports[]=
 214 {
 215         {
 216                 .regi_sser             = SYNCSER_INST,
 217                 .regi_dmaout           = OUT_DMA_INST,
 218                 .regi_dmain            = IN_DMA_INST,
 219 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)
 220                 .use_dma               = 1,
 221 #else
 222                 .use_dma               = 0,
 223 #endif
 224         }
 225 #ifdef CONFIG_ETRAXFS
 226         ,
 227
 228         {
 229                 .regi_sser             = regi_sser1,
 230                 .regi_dmaout           = regi_dma6,
 231                 .regi_dmain            = regi_dma7,
 232 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)
 233                 .use_dma               = 1,
 234 #else
 235                 .use_dma               = 0,
 236 #endif
 237         }
 238 #endif
 239 };
 240
 241 #define NBR_PORTS ARRAY_SIZE(ports)
 242
 243 static const struct file_operations sync_serial_fops = {
 244         .owner   = THIS_MODULE,
 245         .write   = sync_serial_write,
 246         .read    = sync_serial_read,
 247         .poll    = sync_serial_poll,
 248         .ioctl   = sync_serial_ioctl,
 249         .open    = sync_serial_open,
 250         .release = sync_serial_release
 251 };
 252
 253 static int __init etrax_sync_serial_init(void)
 254 {
 255         ports[0].enabled = 0;
 256 #ifdef CONFIG_ETRAXFS
 257         ports[1].enabled = 0;
 258 #endif
 259         if (register_chrdev(SYNC_SERIAL_MAJOR, "sync serial",
 260                         &sync_serial_fops) < 0) {
 261                 printk(KERN_WARNING
 262                         "Unable to get major for synchronous serial port\n");
 263                 return -EBUSY;
 264         }
 265
 266         /* Initialize Ports */
 267 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0)
 268         if (crisv32_pinmux_alloc_fixed(PINMUX_SSER)) {
 269                 printk(KERN_WARNING
 270                         "Unable to alloc pins for synchronous serial port 0\n");
 271                 return -EIO;
 272         }
 273         ports[0].enabled = 1;
 274         initialize_port(0);
 275 #endif
 276
 277 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
 278         if (crisv32_pinmux_alloc_fixed(pinmux_sser1)) {
 279                 printk(KERN_WARNING
 280                         "Unable to alloc pins for synchronous serial port 0\n");
 281                 return -EIO;
 282         }
 283         ports[1].enabled = 1;
 284         initialize_port(1);
 285 #endif
 286
 287 #ifdef CONFIG_ETRAXFS
 288         printk(KERN_INFO "ETRAX FS synchronous serial port driver\n");
 289 #else
 290         printk(KERN_INFO "Artpec-3 synchronous serial port driver\n");
 291 #endif
 292         return 0;
 293 }
 294
 295 static void __init initialize_port(int portnbr)
 296 {
 297         int __attribute__((unused)) i;
 298         struct sync_port *port = &ports[portnbr];
 299         reg_sser_rw_cfg cfg = {0};
 300         reg_sser_rw_frm_cfg frm_cfg = {0};
 301         reg_sser_rw_tr_cfg tr_cfg = {0};
 302         reg_sser_rw_rec_cfg rec_cfg = {0};
 303
 304         DEBUG(printk(KERN_DEBUG "Init sync serial port %d\n", portnbr));
 305
 306         port->port_nbr = portnbr;
 307         port->init_irqs = 1;
 308
 309         port->out_rd_ptr = port->out_buffer;
 310         port->out_buf_count = 0;
 311
 312         port->output = 1;
 313         port->input = 0;
 314
 315         port->readp = port->flip;
 316         port->writep = port->flip;
 317         port->in_buffer_size = IN_BUFFER_SIZE;
 318         port->inbufchunk = IN_DESCR_SIZE;
 319         port->next_rx_desc = &port->in_descr[0];
 320         port->prev_rx_desc = &port->in_descr[NBR_IN_DESCR-1];
 321         port->prev_rx_desc->eol = 1;
 322
 323         init_waitqueue_head(&port->out_wait_q);
 324         init_waitqueue_head(&port->in_wait_q);
 325
 326         spin_lock_init(&port->lock);
 327
 328         cfg.out_clk_src = regk_sser_intern_clk;
 329         cfg.out_clk_pol = regk_sser_pos;
 330         cfg.clk_od_mode = regk_sser_no;
 331         cfg.clk_dir = regk_sser_out;
 332         cfg.gate_clk = regk_sser_no;
 333         cfg.base_freq = regk_sser_f29_493;
 334         cfg.clk_div = 256;
 335         REG_WR(sser, port->regi_sser, rw_cfg, cfg);
 336
 337         frm_cfg.wordrate = DEFAULT_WORD_RATE;
 338         frm_cfg.type = regk_sser_edge;
 339         frm_cfg.frame_pin_dir = regk_sser_out;
 340         frm_cfg.frame_pin_use = regk_sser_frm;
 341         frm_cfg.status_pin_dir = regk_sser_in;
 342         frm_cfg.status_pin_use = regk_sser_hold;
 343         frm_cfg.out_on = regk_sser_tr;
 344         frm_cfg.tr_delay = 1;
 345         REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg);
 346
 347         tr_cfg.urun_stop = regk_sser_no;
 348         tr_cfg.sample_size = 7;
 349         tr_cfg.sh_dir = regk_sser_msbfirst;
 350         tr_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no;
 351 #if 0
 352         tr_cfg.rate_ctrl = regk_sser_bulk;
 353         tr_cfg.data_pin_use = regk_sser_dout;
 354 #else
 355         tr_cfg.rate_ctrl = regk_sser_iso;
 356         tr_cfg.data_pin_use = regk_sser_dout;
 357 #endif
 358         tr_cfg.bulk_wspace = 1;
 359         REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
 360
 361         rec_cfg.sample_size = 7;
 362         rec_cfg.sh_dir = regk_sser_msbfirst;
 363         rec_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no;
 364         rec_cfg.fifo_thr = regk_sser_inf;
 365         REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
 366
 367 #ifdef SYNC_SER_DMA
 368         /* Setup the descriptor ring for dma out/transmit. */
 369         for (i = 0; i < NBR_OUT_DESCR; i++) {
 370                 port->out_descr[i].wait = 0;
 371                 port->out_descr[i].intr = 1;
 372                 port->out_descr[i].eol = 0;
 373                 port->out_descr[i].out_eop = 0;
 374                 port->out_descr[i].next =
 375                         (dma_descr_data *)virt_to_phys(&port->out_descr[i+1]);
 376         }
 377
 378         /* Create a ring from the list. */
 379         port->out_descr[NBR_OUT_DESCR-1].next =
 380                 (dma_descr_data *)virt_to_phys(&port->out_descr[0]);
 381
 382         /* Setup context for traversing the ring. */
 383         port->active_tr_descr = &port->out_descr[0];
 384         port->prev_tr_descr = &port->out_descr[NBR_OUT_DESCR-1];
 385         port->catch_tr_descr = &port->out_descr[0];
 386 #endif
 387 }
 388
 389 static inline int sync_data_avail(struct sync_port *port)
 390 {
 391         int avail;
 392         unsigned char *start;
 393         unsigned char *end;
 394
 395         start = (unsigned char*)port->readp; /* cast away volatile */
 396         end = (unsigned char*)port->writep;  /* cast away volatile */
 397         /* 0123456789  0123456789
 398          *  -----      -    -----
 399          *  ^rp  ^wp    ^wp ^rp
 400          */
 401
 402         if (end >= start)
 403                 avail = end - start;
 404         else
 405                 avail = port->in_buffer_size - (start - end);
 406         return avail;
 407 }
 408
 409 static inline int sync_data_avail_to_end(struct sync_port *port)
 410 {
 411         int avail;
 412         unsigned char *start;
 413         unsigned char *end;
 414
 415         start = (unsigned char*)port->readp; /* cast away volatile */
 416         end = (unsigned char*)port->writep;  /* cast away volatile */
 417         /* 0123456789  0123456789
 418          *  -----           -----
 419          *  ^rp  ^wp    ^wp ^rp
 420          */
 421
 422         if (end >= start)
 423                 avail = end - start;
 424         else
 425                 avail = port->flip + port->in_buffer_size - start;
 426         return avail;
 427 }
 428
 429 static int sync_serial_open(struct inode *inode, struct file *file)
 430 {
 431         int dev = iminor(inode);
 432         sync_port *port;
 433         reg_dma_rw_cfg cfg = {.en = regk_dma_yes};
 434         reg_dma_rw_intr_mask intr_mask = {.data = regk_dma_yes};
 435
 436         DEBUG(printk(KERN_DEBUG "Open sync serial port %d\n", dev));
 437
 438         if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
 439         {
 440                 DEBUG(printk(KERN_DEBUG "Invalid minor %d\n", dev));
 441                 return -ENODEV;
 442         }
 443         port = &ports[dev];
 444         /* Allow open this device twice (assuming one reader and one writer) */
 445         if (port->busy == 2)
 446         {
 447                 DEBUG(printk(KERN_DEBUG "Device is busy.. \n"));
 448                 return -EBUSY;
 449         }
 450
 451
 452         if (port->init_irqs) {
 453                 if (port->use_dma) {
 454                         if (port == &ports[0]) {
 455 #ifdef SYNC_SER_DMA
 456                                 if (request_irq(DMA_OUT_INTR_VECT,
 457                                                 tr_interrupt,
 458                                                 0,
 459                                                 "synchronous serial 0 dma tr",
 460                                                 &ports[0])) {
 461                                         printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
 462                                         return -EBUSY;
 463                                 } else if (request_irq(DMA_IN_INTR_VECT,
 464                                                 rx_interrupt,
 465                                                 0,
 466                                                 "synchronous serial 1 dma rx",
 467                                                 &ports[0])) {
 468                                         free_irq(DMA_OUT_INTR_VECT, &port[0]);
 469                                         printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
 470                                         return -EBUSY;
 471                                 } else if (crisv32_request_dma(OUT_DMA_NBR,
 472                                                 "synchronous serial 0 dma tr",
 473                                                 DMA_VERBOSE_ON_ERROR,
 474                                                 0,
 475                                                 REQ_DMA_SYNCSER)) {
 476                                         free_irq(DMA_OUT_INTR_VECT, &port[0]);
 477                                         free_irq(DMA_IN_INTR_VECT, &port[0]);
 478                                         printk(KERN_CRIT "Can't allocate sync serial port 0 TX DMA channel");
 479                                         return -EBUSY;
 480                                 } else if (crisv32_request_dma(IN_DMA_NBR,
 481                                                 "synchronous serial 0 dma rec",
 482                                                 DMA_VERBOSE_ON_ERROR,
 483                                                 0,
 484                                                 REQ_DMA_SYNCSER)) {
 485                                         crisv32_free_dma(OUT_DMA_NBR);
 486                                         free_irq(DMA_OUT_INTR_VECT, &port[0]);
 487                                         free_irq(DMA_IN_INTR_VECT, &port[0]);
 488                                         printk(KERN_CRIT "Can't allocate sync serial port 1 RX DMA channel");
 489                                         return -EBUSY;
 490                                 }
 491 #endif
 492                         }
 493 #ifdef CONFIG_ETRAXFS
 494                         else if (port == &ports[1]) {
 495 #ifdef SYNC_SER_DMA
 496                                 if (request_irq(DMA6_INTR_VECT,
 497                                                 tr_interrupt,
 498                                                 0,
 499                                                 "synchronous serial 1 dma tr",
 500                                                 &ports[1])) {
 501                                         printk(KERN_CRIT "Can't allocate sync serial port 1 IRQ");
 502                                         return -EBUSY;
 503                                 } else if (request_irq(DMA7_INTR_VECT,
 504                                                        rx_interrupt,
 505                                                        0,
 506                                                        "synchronous serial 1 dma rx",
 507                                                        &ports[1])) {
 508                                         free_irq(DMA6_INTR_VECT, &ports[1]);
 509                                         printk(KERN_CRIT "Can't allocate sync serial port 3 IRQ");
 510                                         return -EBUSY;
 511                                 } else if (crisv32_request_dma(
 512                                                 SYNC_SER1_TX_DMA_NBR,
 513                                                 "synchronous serial 1 dma tr",
 514                                                 DMA_VERBOSE_ON_ERROR,
 515                                                 0,
 516                                                 dma_sser1)) {
 517                                         free_irq(DMA6_INTR_VECT, &ports[1]);
 518                                         free_irq(DMA7_INTR_VECT, &ports[1]);
 519                                         printk(KERN_CRIT "Can't allocate sync serial port 3 TX DMA channel");
 520                                         return -EBUSY;
 521                                 } else if (crisv32_request_dma(
 522                                                 SYNC_SER1_RX_DMA_NBR,
 523                                                 "synchronous serial 3 dma rec",
 524                                                 DMA_VERBOSE_ON_ERROR,
 525                                                 0,
 526                                                 dma_sser1)) {
 527                                         crisv32_free_dma(SYNC_SER1_TX_DMA_NBR);
 528                                         free_irq(DMA6_INTR_VECT, &ports[1]);
 529                                         free_irq(DMA7_INTR_VECT, &ports[1]);
 530                                         printk(KERN_CRIT "Can't allocate sync serial port 3 RX DMA channel");
 531                                         return -EBUSY;
 532                                 }
 533 #endif
 534                         }
 535 #endif
 536                         /* Enable DMAs */
 537                         REG_WR(dma, port->regi_dmain, rw_cfg, cfg);
 538                         REG_WR(dma, port->regi_dmaout, rw_cfg, cfg);
 539                         /* Enable DMA IRQs */
 540                         REG_WR(dma, port->regi_dmain, rw_intr_mask, intr_mask);
 541                         REG_WR(dma, port->regi_dmaout, rw_intr_mask, intr_mask);
 542                         /* Set up wordsize = 1 for DMAs. */
 543                         DMA_WR_CMD (port->regi_dmain, regk_dma_set_w_size1);
 544                         DMA_WR_CMD (port->regi_dmaout, regk_dma_set_w_size1);
 545
 546                         start_dma_in(port);
 547                         port->init_irqs = 0;
 548                 } else { /* !port->use_dma */
 549 #ifdef SYNC_SER_MANUAL
 550                         if (port == &ports[0]) {
 551                                 if (request_irq(SYNCSER_INTR_VECT,
 552                                                 manual_interrupt,
 553                                                 0,
 554                                                 "synchronous serial manual irq",
 555                                                 &ports[0])) {
 556                                         printk("Can't allocate sync serial manual irq");
 557                                         return -EBUSY;
 558                                 }
 559                         }
 560 #ifdef CONFIG_ETRAXFS
 561                         else if (port == &ports[1]) {
 562                                 if (request_irq(SSER1_INTR_VECT,
 563                                                 manual_interrupt,
 564                                                 0,
 565                                                 "synchronous serial manual irq",
 566                                                 &ports[1])) {
 567                                         printk(KERN_CRIT "Can't allocate sync serial manual irq");
 568                                         return -EBUSY;
 569                                 }
 570                         }
 571 #endif
 572                         port->init_irqs = 0;
 573 #else
 574                         panic("sync_serial: Manual mode not supported.\n");
 575 #endif /* SYNC_SER_MANUAL */
 576                 }
 577
 578         } /* port->init_irqs */
 579
 580         port->busy++;
 581         return 0;
 582 }
 583
 584 static int sync_serial_release(struct inode *inode, struct file *file)
 585 {
 586         int dev = iminor(inode);
 587         sync_port *port;
 588
 589         if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
 590         {
 591                 DEBUG(printk("Invalid minor %d\n", dev));
 592                 return -ENODEV;
 593         }
 594         port = &ports[dev];
 595         if (port->busy)
 596                 port->busy--;
 597         if (!port->busy)
 598           /* XXX */ ;
 599         return 0;
 600 }
 601
 602 static unsigned int sync_serial_poll(struct file *file, poll_table *wait)
 603 {
 604         int dev = iminor(file->f_path.dentry->d_inode);
 605         unsigned int mask = 0;
 606         sync_port *port;
 607         DEBUGPOLL( static unsigned int prev_mask = 0; );
 608
 609         port = &ports[dev];
 610
 611         if (!port->started) {
 612                 reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
 613                 reg_sser_rw_rec_cfg rec_cfg =
 614                         REG_RD(sser, port->regi_sser, rw_rec_cfg);
 615                 cfg.en = regk_sser_yes;
 616                 rec_cfg.rec_en = port->input;
 617                 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
 618                 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
 619                 port->started = 1;
 620         }
 621
 622         poll_wait(file, &port->out_wait_q, wait);
 623         poll_wait(file, &port->in_wait_q, wait);
 624
 625         /* No active transfer, descriptors are available */
 626         if (port->output && !port->tr_running)
 627                 mask |= POLLOUT | POLLWRNORM;
 628
 629         /* Descriptor and buffer space available. */
 630         if (port->output &&
 631             port->active_tr_descr != port->catch_tr_descr &&
 632             port->out_buf_count < OUT_BUFFER_SIZE)
 633                 mask |=  POLLOUT | POLLWRNORM;
 634
 635         /* At least an inbufchunk of data */
 636         if (port->input && sync_data_avail(port) >= port->inbufchunk)
 637                 mask |= POLLIN | POLLRDNORM;
 638
 639         DEBUGPOLL(if (mask != prev_mask)
 640               printk("sync_serial_poll: mask 0x%08X %s %s\n", mask,
 641                      mask&POLLOUT?"POLLOUT":"", mask&POLLIN?"POLLIN":"");
 642               prev_mask = mask;
 643               );
 644         return mask;
 645 }
 646
 647 static int sync_serial_ioctl(struct inode *inode, struct file *file,
 648                   unsigned int cmd, unsigned long arg)
 649 {
 650         int return_val = 0;
 651         int dma_w_size = regk_dma_set_w_size1;
 652         int dev = iminor(file->f_path.dentry->d_inode);
 653         sync_port *port;
 654         reg_sser_rw_tr_cfg tr_cfg;
 655         reg_sser_rw_rec_cfg rec_cfg;
 656         reg_sser_rw_frm_cfg frm_cfg;
 657         reg_sser_rw_cfg gen_cfg;
 658         reg_sser_rw_intr_mask intr_mask;
 659
 660         if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
 661         {
 662                 DEBUG(printk("Invalid minor %d\n", dev));
 663                 return -1;
 664         }
 665         port = &ports[dev];
 666         spin_lock_irq(&port->lock);
 667
 668         tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
 669         rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
 670         frm_cfg = REG_RD(sser, port->regi_sser, rw_frm_cfg);
 671         gen_cfg = REG_RD(sser, port->regi_sser, rw_cfg);
 672         intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
 673
 674         switch(cmd)
 675         {
 676         case SSP_SPEED:
 677                 if (GET_SPEED(arg) == CODEC)
 678                 {
 679                         unsigned int freq;
 680
 681                         gen_cfg.base_freq = regk_sser_f32;
 682
 683                         /* Clock divider will internally be
 684                          * gen_cfg.clk_div + 1.
 685                          */
 686
 687                         freq = GET_FREQ(arg);
 688                         switch (freq) {
 689                         case FREQ_32kHz:
 690                         case FREQ_64kHz:
 691                         case FREQ_128kHz:
 692                         case FREQ_256kHz:
 693                                 gen_cfg.clk_div = 125 *
 694                                         (1 << (freq - FREQ_256kHz)) - 1;
 695                         break;
 696                         case FREQ_512kHz:
 697                                 gen_cfg.clk_div = 62;
 698                         break;
 699                         case FREQ_1MHz:
 700                         case FREQ_2MHz:
 701                         case FREQ_4MHz:
 702                                 gen_cfg.clk_div = 8 * (1 << freq) - 1;
 703                         break;
 704                         }
 705                 } else {
 706                         gen_cfg.base_freq = regk_sser_f29_493;
 707                         switch (GET_SPEED(arg)) {
 708                         case SSP150:
 709                                 gen_cfg.clk_div = 29493000 / (150 * 8) - 1;
 710                                 break;
 711                         case SSP300:
 712                                 gen_cfg.clk_div = 29493000 / (300 * 8) - 1;
 713                                 break;
 714                         case SSP600:
 715                                 gen_cfg.clk_div = 29493000 / (600 * 8) - 1;
 716                                 break;
 717                         case SSP1200:
 718                                 gen_cfg.clk_div = 29493000 / (1200 * 8) - 1;
 719                                 break;
 720                         case SSP2400:
 721                                 gen_cfg.clk_div = 29493000 / (2400 * 8) - 1;
 722                                 break;
 723                         case SSP4800:
 724                                 gen_cfg.clk_div = 29493000 / (4800 * 8) - 1;
 725                                 break;
 726                         case SSP9600:
 727                                 gen_cfg.clk_div = 29493000 / (9600 * 8) - 1;
 728                                 break;
 729                         case SSP19200:
 730                                 gen_cfg.clk_div = 29493000 / (19200 * 8) - 1;
 731                                 break;
 732                         case SSP28800:
 733                                 gen_cfg.clk_div = 29493000 / (28800 * 8) - 1;
 734                                 break;
 735                         case SSP57600:
 736                                 gen_cfg.clk_div = 29493000 / (57600 * 8) - 1;
 737                                 break;
 738                         case SSP115200:
 739                                 gen_cfg.clk_div = 29493000 / (115200 * 8) - 1;
 740                                 break;
 741                         case SSP230400:
 742                                 gen_cfg.clk_div = 29493000 / (230400 * 8) - 1;
 743                                 break;
 744                         case SSP460800:
 745                                 gen_cfg.clk_div = 29493000 / (460800 * 8) - 1;
 746                                 break;
 747                         case SSP921600:
 748                                 gen_cfg.clk_div = 29493000 / (921600 * 8) - 1;
 749                                 break;
 750                         case SSP3125000:
 751                                 gen_cfg.base_freq = regk_sser_f100;
 752                                 gen_cfg.clk_div = 100000000 / (3125000 * 8) - 1;
 753                                 break;
 754
 755                         }
 756                 }
 757                 frm_cfg.wordrate = GET_WORD_RATE(arg);
 758
 759                 break;
 760         case SSP_MODE:
 761                 switch(arg)
 762                 {
 763                         case MASTER_OUTPUT:
 764                                 port->output = 1;
 765                                 port->input = 0;
 766                                 frm_cfg.out_on = regk_sser_tr;
 767                                 frm_cfg.frame_pin_dir = regk_sser_out;
 768                                 gen_cfg.clk_dir = regk_sser_out;
 769                                 break;
 770                         case SLAVE_OUTPUT:
 771                                 port->output = 1;
 772                                 port->input = 0;
 773                                 frm_cfg.frame_pin_dir = regk_sser_in;
 774                                 gen_cfg.clk_dir = regk_sser_in;
 775                                 break;
 776                         case MASTER_INPUT:
 777                                 port->output = 0;
 778                                 port->input = 1;
 779                                 frm_cfg.frame_pin_dir = regk_sser_out;
 780                                 frm_cfg.out_on = regk_sser_intern_tb;
 781                                 gen_cfg.clk_dir = regk_sser_out;
 782                                 break;
 783                         case SLAVE_INPUT:
 784                                 port->output = 0;
 785                                 port->input = 1;
 786                                 frm_cfg.frame_pin_dir = regk_sser_in;
 787                                 gen_cfg.clk_dir = regk_sser_in;
 788                                 break;
 789                         case MASTER_BIDIR:
 790                                 port->output = 1;
 791                                 port->input = 1;
 792                                 frm_cfg.frame_pin_dir = regk_sser_out;
 793                                 frm_cfg.out_on = regk_sser_intern_tb;
 794                                 gen_cfg.clk_dir = regk_sser_out;
 795                                 break;
 796                         case SLAVE_BIDIR:
 797                                 port->output = 1;
 798                                 port->input = 1;
 799                                 frm_cfg.frame_pin_dir = regk_sser_in;
 800                                 gen_cfg.clk_dir = regk_sser_in;
 801                                 break;
 802                         default:
 803                                 spin_unlock_irq(&port->lock);
 804                                 return -EINVAL;
 805                 }
 806                 if (!port->use_dma || (arg == MASTER_OUTPUT || arg == SLAVE_OUTPUT))
 807                         intr_mask.rdav = regk_sser_yes;
 808                 break;
 809         case SSP_FRAME_SYNC:
 810                 if (arg & NORMAL_SYNC) {
 811                         frm_cfg.rec_delay = 1;
 812                         frm_cfg.tr_delay = 1;
 813                 }
 814                 else if (arg & EARLY_SYNC)
 815                         frm_cfg.rec_delay = frm_cfg.tr_delay = 0;
 816                 else if (arg & SECOND_WORD_SYNC) {
 817                         frm_cfg.rec_delay = 7;
 818                         frm_cfg.tr_delay = 1;
 819                 }
 820
 821                 tr_cfg.bulk_wspace = frm_cfg.tr_delay;
 822                 frm_cfg.early_wend = regk_sser_yes;
 823                 if (arg & BIT_SYNC)
 824                         frm_cfg.type = regk_sser_edge;
 825                 else if (arg & WORD_SYNC)
 826                         frm_cfg.type = regk_sser_level;
 827                 else if (arg & EXTENDED_SYNC)
 828                         frm_cfg.early_wend = regk_sser_no;
 829
 830                 if (arg & SYNC_ON)
 831                         frm_cfg.frame_pin_use = regk_sser_frm;
 832                 else if (arg & SYNC_OFF)
 833                         frm_cfg.frame_pin_use = regk_sser_gio0;
 834
 835                 dma_w_size = regk_dma_set_w_size2;
 836                 if (arg & WORD_SIZE_8) {
 837                         rec_cfg.sample_size = tr_cfg.sample_size = 7;
 838                         dma_w_size = regk_dma_set_w_size1;
 839                 } else if (arg & WORD_SIZE_12)
 840                         rec_cfg.sample_size = tr_cfg.sample_size = 11;
 841                 else if (arg & WORD_SIZE_16)
 842                         rec_cfg.sample_size = tr_cfg.sample_size = 15;
 843                 else if (arg & WORD_SIZE_24)
 844                         rec_cfg.sample_size = tr_cfg.sample_size = 23;
 845                 else if (arg & WORD_SIZE_32)
 846                         rec_cfg.sample_size = tr_cfg.sample_size = 31;
 847
 848                 if (arg & BIT_ORDER_MSB)
 849                         rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst;
 850                 else if (arg & BIT_ORDER_LSB)
 851                         rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_lsbfirst;
 852
 853                 if (arg & FLOW_CONTROL_ENABLE) {
 854                         frm_cfg.status_pin_use = regk_sser_frm;
 855                         rec_cfg.fifo_thr = regk_sser_thr16;
 856                 } else if (arg & FLOW_CONTROL_DISABLE) {
 857                         frm_cfg.status_pin_use = regk_sser_gio0;
 858                         rec_cfg.fifo_thr = regk_sser_inf;
 859                 }
 860
 861                 if (arg & CLOCK_NOT_GATED)
 862                         gen_cfg.gate_clk = regk_sser_no;
 863                 else if (arg & CLOCK_GATED)
 864                         gen_cfg.gate_clk = regk_sser_yes;
 865
 866                 break;
 867         case SSP_IPOLARITY:
 868                 /* NOTE!! negedge is considered NORMAL */
 869                 if (arg & CLOCK_NORMAL)
 870                         rec_cfg.clk_pol = regk_sser_neg;
 871                 else if (arg & CLOCK_INVERT)
 872                         rec_cfg.clk_pol = regk_sser_pos;
 873
 874                 if (arg & FRAME_NORMAL)
 875                         frm_cfg.level = regk_sser_pos_hi;
 876                 else if (arg & FRAME_INVERT)
 877                         frm_cfg.level = regk_sser_neg_lo;
 878
 879                 if (arg & STATUS_NORMAL)
 880                         gen_cfg.hold_pol = regk_sser_pos;
 881                 else if (arg & STATUS_INVERT)
 882                         gen_cfg.hold_pol = regk_sser_neg;
 883                 break;
 884         case SSP_OPOLARITY:
 885                 if (arg & CLOCK_NORMAL)
 886                         gen_cfg.out_clk_pol = regk_sser_pos;
 887                 else if (arg & CLOCK_INVERT)
 888                         gen_cfg.out_clk_pol = regk_sser_neg;
 889
 890                 if (arg & FRAME_NORMAL)
 891                         frm_cfg.level = regk_sser_pos_hi;
 892                 else if (arg & FRAME_INVERT)
 893                         frm_cfg.level = regk_sser_neg_lo;
 894
 895                 if (arg & STATUS_NORMAL)
 896                         gen_cfg.hold_pol = regk_sser_pos;
 897                 else if (arg & STATUS_INVERT)
 898                         gen_cfg.hold_pol = regk_sser_neg;
 899                 break;
 900         case SSP_SPI:
 901                 rec_cfg.fifo_thr = regk_sser_inf;
 902                 rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst;
 903                 rec_cfg.sample_size = tr_cfg.sample_size = 7;
 904                 frm_cfg.frame_pin_use = regk_sser_frm;
 905                 frm_cfg.type = regk_sser_level;
 906                 frm_cfg.tr_delay = 1;
 907                 frm_cfg.level = regk_sser_neg_lo;
 908                 if (arg & SPI_SLAVE)
 909                 {
 910                         rec_cfg.clk_pol = regk_sser_neg;
 911                         gen_cfg.clk_dir = regk_sser_in;
 912                         port->input = 1;
 913                         port->output = 0;
 914                 }
 915                 else
 916                 {
 917                         gen_cfg.out_clk_pol = regk_sser_pos;
 918                         port->input = 0;
 919                         port->output = 1;
 920                         gen_cfg.clk_dir = regk_sser_out;
 921                 }
 922                 break;
 923         case SSP_INBUFCHUNK:
 924                 break;
 925         default:
 926                 return_val = -1;
 927         }
 928
 929
 930         if (port->started) {
 931                 rec_cfg.rec_en = port->input;
 932                 gen_cfg.en = (port->output | port->input);
 933         }
 934
 935         REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
 936         REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
 937         REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg);
 938         REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
 939         REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg);
 940
 941
 942         if (cmd == SSP_FRAME_SYNC && (arg & (WORD_SIZE_8 | WORD_SIZE_12 |
 943                         WORD_SIZE_16 | WORD_SIZE_24 | WORD_SIZE_32))) {
 944                 int en = gen_cfg.en;
 945                 gen_cfg.en = 0;
 946                 REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg);
 947                 /* ##### Should DMA be stoped before we change dma size? */
 948                 DMA_WR_CMD(port->regi_dmain, dma_w_size);
 949                 DMA_WR_CMD(port->regi_dmaout, dma_w_size);
 950                 gen_cfg.en = en;
 951                 REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg);
 952         }
 953
 954         spin_unlock_irq(&port->lock);
 955         return return_val;
 956 }
 957
 958 /* NOTE: sync_serial_write does not support concurrency */
 959 static ssize_t sync_serial_write(struct file *file, const char *buf,
 960                                  size_t count, loff_t *ppos)
 961 {
 962         int dev = iminor(file->f_path.dentry->d_inode);
 963         DECLARE_WAITQUEUE(wait, current);
 964         struct sync_port *port;
 965         int trunc_count;
 966         unsigned long flags;
 967         int bytes_free;
 968         int out_buf_count;
 969
 970         unsigned char *rd_ptr;       /* First allocated byte in the buffer */
 971         unsigned char *wr_ptr;       /* First free byte in the buffer */
 972         unsigned char *buf_stop_ptr; /* Last byte + 1 */
 973
 974         if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) {
 975                 DEBUG(printk("Invalid minor %d\n", dev));
 976                 return -ENODEV;
 977         }
 978         port = &ports[dev];
 979
 980         /* |<-         OUT_BUFFER_SIZE                          ->|
 981          *           |<- out_buf_count ->|
 982          *                               |<- trunc_count ->| ...->|
 983          *  ______________________________________________________
 984          * |  free   |   data            | free                   |
 985          * |_________|___________________|________________________|
 986          *           ^ rd_ptr            ^ wr_ptr
 987          */
 988         DEBUGWRITE(printk(KERN_DEBUG "W d%d c %lu a: %p c: %p\n",
 989                           port->port_nbr, count, port->active_tr_descr,
 990                           port->catch_tr_descr));
 991
 992         /* Read variables that may be updated by interrupts */
 993         spin_lock_irqsave(&port->lock, flags);
 994         rd_ptr = port->out_rd_ptr;
 995         out_buf_count = port->out_buf_count;
 996         spin_unlock_irqrestore(&port->lock, flags);
 997
 998         /* Check if resources are available */
 999         if (port->tr_running &&
1000             ((port->use_dma && port->active_tr_descr == port->catch_tr_descr) ||
1001              out_buf_count >= OUT_BUFFER_SIZE)) {
1002                 DEBUGWRITE(printk(KERN_DEBUG "sser%d full\n", dev));
1003                 return -EAGAIN;
1004         }
1005
1006         buf_stop_ptr = port->out_buffer + OUT_BUFFER_SIZE;
1007
1008         /* Determine pointer to the first free byte, before copying. */
1009         wr_ptr = rd_ptr + out_buf_count;
1010         if (wr_ptr >= buf_stop_ptr)
1011                 wr_ptr -= OUT_BUFFER_SIZE;
1012
1013         /* If we wrap the ring buffer, let the user space program handle it by
1014          * truncating the data. This could be more elegant, small buffer
1015          * fragments may occur.
1016          */
1017         bytes_free = OUT_BUFFER_SIZE - out_buf_count;
1018         if (wr_ptr + bytes_free > buf_stop_ptr)
1019                 bytes_free = buf_stop_ptr - wr_ptr;
1020         trunc_count = (count < bytes_free) ? count : bytes_free;
1021
1022         if (copy_from_user(wr_ptr, buf, trunc_count))
1023                 return -EFAULT;
1024
1025         DEBUGOUTBUF(printk(KERN_DEBUG "%-4d + %-4d = %-4d     %p %p %p\n",
1026                            out_buf_count, trunc_count,
1027                            port->out_buf_count, port->out_buffer,
1028                            wr_ptr, buf_stop_ptr));
1029
1030         /* Make sure transmitter/receiver is running */
1031         if (!port->started) {
1032                 reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
1033                 reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
1034                 cfg.en = regk_sser_yes;
1035                 rec_cfg.rec_en = port->input;
1036                 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
1037                 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
1038                 port->started = 1;
1039         }
1040
1041         /* Setup wait if blocking */
1042         if (!(file->f_flags & O_NONBLOCK)) {
1043                 add_wait_queue(&port->out_wait_q, &wait);
1044                 set_current_state(TASK_INTERRUPTIBLE);
1045         }
1046
1047         spin_lock_irqsave(&port->lock, flags);
1048         port->out_buf_count += trunc_count;
1049         if (port->use_dma) {
1050                 start_dma_out(port, wr_ptr, trunc_count);
1051         } else if (!port->tr_running) {
1052                 reg_sser_rw_intr_mask intr_mask;
1053                 intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
1054                 /* Start sender by writing data */
1055                 send_word(port);
1056                 /* and enable transmitter ready IRQ */
1057                 intr_mask.trdy = 1;
1058                 REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
1059         }
1060         spin_unlock_irqrestore(&port->lock, flags);
1061
1062         /* Exit if non blocking */
1063         if (file->f_flags & O_NONBLOCK) {
1064                 DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu  %08x\n",
1065                                   port->port_nbr, trunc_count,
1066                                   REG_RD_INT(dma, port->regi_dmaout, r_intr)));
1067                 return trunc_count;
1068         }
1069
1070         schedule();
1071         set_current_state(TASK_RUNNING);
1072         remove_wait_queue(&port->out_wait_q, &wait);
1073
1074         if (signal_pending(current))
1075                 return -EINTR;
1076
1077         DEBUGWRITE(printk(KERN_DEBUG "w d%d c %lu\n",
1078                           port->port_nbr, trunc_count));
1079         return trunc_count;
1080 }
1081
1082 static ssize_t sync_serial_read(struct file * file, char * buf,
1083                                 size_t count, loff_t *ppos)
1084 {
1085         int dev = iminor(file->f_path.dentry->d_inode);
1086         int avail;
1087         sync_port *port;
1088         unsigned char* start;
1089         unsigned char* end;
1090         unsigned long flags;
1091
1092         if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled)
1093         {
1094                 DEBUG(printk("Invalid minor %d\n", dev));
1095                 return -ENODEV;
1096         }
1097         port = &ports[dev];
1098
1099         DEBUGREAD(printk("R%d c %d ri %lu wi %lu /%lu\n", dev, count, port->readp - port->flip, port->writep - port->flip, port->in_buffer_size));
1100
1101         if (!port->started)
1102         {
1103                 reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
1104                 reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
1105                 reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
1106                 cfg.en = regk_sser_yes;
1107                 tr_cfg.tr_en = regk_sser_yes;
1108                 rec_cfg.rec_en = regk_sser_yes;
1109                 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
1110                 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
1111                 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
1112                 port->started = 1;
1113         }
1114
1115         /* Calculate number of available bytes */
1116         /* Save pointers to avoid that they are modified by interrupt */
1117         spin_lock_irqsave(&port->lock, flags);
1118         start = (unsigned char*)port->readp; /* cast away volatile */
1119         end = (unsigned char*)port->writep;  /* cast away volatile */
1120         spin_unlock_irqrestore(&port->lock, flags);
1121         while ((start == end) && !port->full) /* No data */
1122         {
1123                 DEBUGREAD(printk(KERN_DEBUG "&"));
1124                 if (file->f_flags & O_NONBLOCK)
1125                         return -EAGAIN;
1126
1127                 interruptible_sleep_on(&port->in_wait_q);
1128                 if (signal_pending(current))
1129                         return -EINTR;
1130
1131                 spin_lock_irqsave(&port->lock, flags);
1132                 start = (unsigned char*)port->readp; /* cast away volatile */
1133                 end = (unsigned char*)port->writep;  /* cast away volatile */
1134                 spin_unlock_irqrestore(&port->lock, flags);
1135         }
1136
1137         /* Lazy read, never return wrapped data. */
1138         if (port->full)
1139                 avail = port->in_buffer_size;
1140         else if (end > start)
1141                 avail = end - start;
1142         else
1143                 avail = port->flip + port->in_buffer_size - start;
1144
1145         count = count > avail ? avail : count;
1146         if (copy_to_user(buf, start, count))
1147                 return -EFAULT;
1148         /* Disable interrupts while updating readp */
1149         spin_lock_irqsave(&port->lock, flags);
1150         port->readp += count;
1151         if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */
1152                 port->readp = port->flip;
1153         port->full = 0;
1154         spin_unlock_irqrestore(&port->lock, flags);
1155         DEBUGREAD(printk("r %d\n", count));
1156         return count;
1157 }
1158
1159 static void send_word(sync_port* port)
1160 {
1161         reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
1162         reg_sser_rw_tr_data tr_data =  {0};
1163
1164         switch(tr_cfg.sample_size)
1165         {
1166          case 8:
1167                  port->out_buf_count--;
1168                  tr_data.data = *port->out_rd_ptr++;
1169                  REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1170                  if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
1171                          port->out_rd_ptr = port->out_buffer;
1172                  break;
1173          case 12:
1174          {
1175                 int data = (*port->out_rd_ptr++) << 8;
1176                 data |= *port->out_rd_ptr++;
1177                 port->out_buf_count -= 2;
1178                 tr_data.data = data;
1179                 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1180                 if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
1181                         port->out_rd_ptr = port->out_buffer;
1182         }
1183         break;
1184         case 16:
1185                 port->out_buf_count -= 2;
1186                 tr_data.data = *(unsigned short *)port->out_rd_ptr;
1187                 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1188                 port->out_rd_ptr += 2;
1189                 if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
1190                         port->out_rd_ptr = port->out_buffer;
1191                 break;
1192         case 24:
1193                 port->out_buf_count -= 3;
1194                 tr_data.data = *(unsigned short *)port->out_rd_ptr;
1195                 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1196                 port->out_rd_ptr += 2;
1197                 tr_data.data = *port->out_rd_ptr++;
1198                 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1199                 if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
1200                         port->out_rd_ptr = port->out_buffer;
1201                 break;
1202         case 32:
1203                 port->out_buf_count -= 4;
1204                 tr_data.data = *(unsigned short *)port->out_rd_ptr;
1205                 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1206                 port->out_rd_ptr += 2;
1207                 tr_data.data = *(unsigned short *)port->out_rd_ptr;
1208                 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1209                 port->out_rd_ptr += 2;
1210                 if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE)
1211                         port->out_rd_ptr = port->out_buffer;
1212                 break;
1213         }
1214 }
1215
1216 static void start_dma_out(struct sync_port *port,
1217                           const char *data, int count)
1218 {
1219         port->active_tr_descr->buf = (char *) virt_to_phys((char *) data);
1220         port->active_tr_descr->after = port->active_tr_descr->buf + count;
1221         port->active_tr_descr->intr = 1;
1222
1223         port->active_tr_descr->eol = 1;
1224         port->prev_tr_descr->eol = 0;
1225
1226         DEBUGTRDMA(printk(KERN_DEBUG "Inserting eolr:%p eol@:%p\n",
1227                 port->prev_tr_descr, port->active_tr_descr));
1228         port->prev_tr_descr = port->active_tr_descr;
1229         port->active_tr_descr = phys_to_virt((int) port->active_tr_descr->next);
1230
1231         if (!port->tr_running) {
1232                 reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser,
1233                         rw_tr_cfg);
1234
1235                 port->out_context.next = 0;
1236                 port->out_context.saved_data =
1237                         (dma_descr_data *)virt_to_phys(port->prev_tr_descr);
1238                 port->out_context.saved_data_buf = port->prev_tr_descr->buf;
1239
1240                 DMA_START_CONTEXT(port->regi_dmaout,
1241                         virt_to_phys((char *)&port->out_context));
1242
1243                 tr_cfg.tr_en = regk_sser_yes;
1244                 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
1245                 DEBUGTRDMA(printk(KERN_DEBUG "dma s\n"););
1246         } else {
1247                 DMA_CONTINUE_DATA(port->regi_dmaout);
1248                 DEBUGTRDMA(printk(KERN_DEBUG "dma c\n"););
1249         }
1250
1251         port->tr_running = 1;
1252 }
1253
1254 static void start_dma_in(sync_port *port)
1255 {
1256         int i;
1257         char *buf;
1258         port->writep = port->flip;
1259
1260         if (port->writep > port->flip + port->in_buffer_size) {
1261                 panic("Offset too large in sync serial driver\n");
1262                 return;
1263         }
1264         buf = (char*)virt_to_phys(port->in_buffer);
1265         for (i = 0; i < NBR_IN_DESCR; i++) {
1266                 port->in_descr[i].buf = buf;
1267                 port->in_descr[i].after = buf + port->inbufchunk;
1268                 port->in_descr[i].intr = 1;
1269                 port->in_descr[i].next = (dma_descr_data*)virt_to_phys(&port->in_descr[i+1]);
1270                 port->in_descr[i].buf = buf;
1271                 buf += port->inbufchunk;
1272         }
1273         /* Link the last descriptor to the first */
1274         port->in_descr[i-1].next = (dma_descr_data*)virt_to_phys(&port->in_descr[0]);
1275         port->in_descr[i-1].eol = regk_sser_yes;
1276         port->next_rx_desc = &port->in_descr[0];
1277         port->prev_rx_desc = &port->in_descr[NBR_IN_DESCR - 1];
1278         port->in_context.saved_data = (dma_descr_data*)virt_to_phys(&port->in_descr[0]);
1279         port->in_context.saved_data_buf = port->in_descr[0].buf;
1280         DMA_START_CONTEXT(port->regi_dmain, virt_to_phys(&port->in_context));
1281 }
1282
1283 #ifdef SYNC_SER_DMA
1284 static irqreturn_t tr_interrupt(int irq, void *dev_id)
1285 {
1286         reg_dma_r_masked_intr masked;
1287         reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes};
1288         reg_dma_rw_stat stat;
1289         int i;
1290         int found = 0;
1291         int stop_sser = 0;
1292
1293         for (i = 0; i < NBR_PORTS; i++) {
1294                 sync_port *port = &ports[i];
1295                 if (!port->enabled  || !port->use_dma)
1296                         continue;
1297
1298                 /* IRQ active for the port? */
1299                 masked = REG_RD(dma, port->regi_dmaout, r_masked_intr);
1300                 if (!masked.data)
1301                         continue;
1302
1303                 found = 1;
1304
1305                 /* Check if we should stop the DMA transfer */
1306                 stat = REG_RD(dma, port->regi_dmaout, rw_stat);
1307                 if (stat.list_state == regk_dma_data_at_eol)
1308                         stop_sser = 1;
1309
1310                 /* Clear IRQ */
1311                 REG_WR(dma, port->regi_dmaout, rw_ack_intr, ack_intr);
1312
1313                 if (!stop_sser) {
1314                         /* The DMA has completed a descriptor, EOL was not
1315                          * encountered, so step relevant descriptor and
1316                          * datapointers forward. */
1317                         int sent;
1318                         sent = port->catch_tr_descr->after -
1319                                 port->catch_tr_descr->buf;
1320                         DEBUGTXINT(printk(KERN_DEBUG "%-4d - %-4d = %-4d\t"
1321                                           "in descr %p (ac: %p)\n",
1322                                           port->out_buf_count, sent,
1323                                           port->out_buf_count - sent,
1324                                           port->catch_tr_descr,
1325                                           port->active_tr_descr););
1326                         port->out_buf_count -= sent;
1327                         port->catch_tr_descr =
1328                                 phys_to_virt((int) port->catch_tr_descr->next);
1329                         port->out_rd_ptr =
1330                                 phys_to_virt((int) port->catch_tr_descr->buf);
1331                 } else {
1332                         int i, sent;
1333                         /* EOL handler.
1334                          * Note that if an EOL was encountered during the irq
1335                          * locked section of sync_ser_write the DMA will be
1336                          * restarted and the eol flag will be cleared.
1337                          * The remaining descriptors will be traversed by
1338                          * the descriptor interrupts as usual.
1339                          */
1340                         i = 0;
1341                         while (!port->catch_tr_descr->eol) {
1342                                 sent = port->catch_tr_descr->after -
1343                                         port->catch_tr_descr->buf;
1344                                 DEBUGOUTBUF(printk(KERN_DEBUG
1345                                         "traversing descr %p -%d (%d)\n",
1346                                         port->catch_tr_descr,
1347                                         sent,
1348                                         port->out_buf_count));
1349                                 port->out_buf_count -= sent;
1350                                 port->catch_tr_descr = phys_to_virt(
1351                                         (int)port->catch_tr_descr->next);
1352                                 i++;
1353                                 if (i >= NBR_OUT_DESCR) {
1354                                         /* TODO: Reset and recover */
1355                                         panic("sync_serial: missing eol");
1356                                 }
1357                         }
1358                         sent = port->catch_tr_descr->after -
1359                                 port->catch_tr_descr->buf;
1360                         DEBUGOUTBUF(printk(KERN_DEBUG
1361                                 "eol at descr %p -%d (%d)\n",
1362                                 port->catch_tr_descr,
1363                                 sent,
1364                                 port->out_buf_count));
1365
1366                         port->out_buf_count -= sent;
1367
1368                         /* Update read pointer to first free byte, we
1369                          * may already be writing data there. */
1370                         port->out_rd_ptr =
1371                                 phys_to_virt((int) port->catch_tr_descr->after);
1372                         if (port->out_rd_ptr > port->out_buffer +
1373                                         OUT_BUFFER_SIZE)
1374                                 port->out_rd_ptr = port->out_buffer;
1375
1376                         reg_sser_rw_tr_cfg tr_cfg =
1377                                 REG_RD(sser, port->regi_sser, rw_tr_cfg);
1378                         DEBUGTXINT(printk(KERN_DEBUG
1379                                 "tr_int DMA stop %d, set catch @ %p\n",
1380                                 port->out_buf_count,
1381                                 port->active_tr_descr));
1382                         if (port->out_buf_count != 0)
1383                                 printk(KERN_CRIT "sync_ser: buffer not "
1384                                         "empty after eol.\n");
1385                         port->catch_tr_descr = port->active_tr_descr;
1386                         port->tr_running = 0;
1387                         tr_cfg.tr_en = regk_sser_no;
1388                         REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
1389                 }
1390                 /* wake up the waiting process */
1391                 wake_up_interruptible(&port->out_wait_q);
1392         }
1393         return IRQ_RETVAL(found);
1394 } /* tr_interrupt */
1395
1396 static irqreturn_t rx_interrupt(int irq, void *dev_id)
1397 {
1398         reg_dma_r_masked_intr masked;
1399         reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes};
1400
1401         int i;
1402         int found = 0;
1403
1404         for (i = 0; i < NBR_PORTS; i++)
1405         {
1406                 sync_port *port = &ports[i];
1407
1408                 if (!port->enabled || !port->use_dma )
1409                         continue;
1410
1411                 masked = REG_RD(dma, port->regi_dmain, r_masked_intr);
1412
1413                 if (masked.data) /* Descriptor interrupt */
1414                 {
1415                         found = 1;
1416                         while (REG_RD(dma, port->regi_dmain, rw_data) !=
1417                                virt_to_phys(port->next_rx_desc)) {
1418                                 DEBUGRXINT(printk(KERN_DEBUG "!"));
1419                                 if (port->writep + port->inbufchunk > port->flip + port->in_buffer_size) {
1420                                         int first_size = port->flip + port->in_buffer_size - port->writep;
1421                                         memcpy((char*)port->writep, phys_to_virt((unsigned)port->next_rx_desc->buf), first_size);
1422                                         memcpy(port->flip, phys_to_virt((unsigned)port->next_rx_desc->buf+first_size), port->inbufchunk - first_size);
1423                                         port->writep = port->flip + port->inbufchunk - first_size;
1424                                 } else {
1425                                         memcpy((char*)port->writep,
1426                                                phys_to_virt((unsigned)port->next_rx_desc->buf),
1427                                                port->inbufchunk);
1428                                         port->writep += port->inbufchunk;
1429                                         if (port->writep >= port->flip + port->in_buffer_size)
1430                                                 port->writep = port->flip;
1431                                 }
1432                                 if (port->writep == port->readp)
1433                                 {
1434                                   port->full = 1;
1435                                 }
1436
1437                                 port->next_rx_desc->eol = 1;
1438                                 port->prev_rx_desc->eol = 0;
1439                                 /* Cache bug workaround */
1440                                 flush_dma_descr(port->prev_rx_desc, 0);
1441                                 port->prev_rx_desc = port->next_rx_desc;
1442                                 port->next_rx_desc = phys_to_virt((unsigned)port->next_rx_desc->next);
1443                                 /* Cache bug workaround */
1444                                 flush_dma_descr(port->prev_rx_desc, 1);
1445                                 /* wake up the waiting process */
1446                                 wake_up_interruptible(&port->in_wait_q);
1447                                 DMA_CONTINUE(port->regi_dmain);
1448                                 REG_WR(dma, port->regi_dmain, rw_ack_intr, ack_intr);
1449
1450                         }
1451                 }
1452         }
1453         return IRQ_RETVAL(found);
1454 } /* rx_interrupt */
1455 #endif /* SYNC_SER_DMA */
1456
1457 #ifdef SYNC_SER_MANUAL
1458 static irqreturn_t manual_interrupt(int irq, void *dev_id)
1459 {
1460         int i;
1461         int found = 0;
1462         reg_sser_r_masked_intr masked;
1463
1464         for (i = 0; i < NBR_PORTS; i++)
1465         {
1466                 sync_port *port = &ports[i];
1467
1468                 if (!port->enabled || port->use_dma)
1469                 {
1470                         continue;
1471                 }
1472
1473                 masked = REG_RD(sser, port->regi_sser, r_masked_intr);
1474                 if (masked.rdav)        /* Data received? */
1475                 {
1476                         reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
1477                         reg_sser_r_rec_data data = REG_RD(sser, port->regi_sser, r_rec_data);
1478                         found = 1;
1479                         /* Read data */
1480                         switch(rec_cfg.sample_size)
1481                         {
1482                         case 8:
1483                                 *port->writep++ = data.data & 0xff;
1484                                 break;
1485                         case 12:
1486                                 *port->writep = (data.data & 0x0ff0) >> 4;
1487                                 *(port->writep + 1) = data.data & 0x0f;
1488                                 port->writep+=2;
1489                                 break;
1490                         case 16:
1491                                 *(unsigned short*)port->writep = data.data;
1492                                 port->writep+=2;
1493                                 break;
1494                         case 24:
1495                                 *(unsigned int*)port->writep = data.data;
1496                                 port->writep+=3;
1497                                 break;
1498                         case 32:
1499                                 *(unsigned int*)port->writep = data.data;
1500                                 port->writep+=4;
1501                                 break;
1502                         }
1503
1504                         if (port->writep >= port->flip + port->in_buffer_size) /* Wrap? */
1505                                 port->writep = port->flip;
1506                         if (port->writep == port->readp) {
1507                                 /* receive buffer overrun, discard oldest data
1508                                  */
1509                                 port->readp++;
1510                                 if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */
1511                                         port->readp = port->flip;
1512                         }
1513                         if (sync_data_avail(port) >= port->inbufchunk)
1514                                 wake_up_interruptible(&port->in_wait_q); /* Wake up application */
1515                 }
1516
1517                 if (masked.trdy) /* Transmitter ready? */
1518                 {
1519                         found = 1;
1520                         if (port->out_buf_count > 0) /* More data to send */
1521                                 send_word(port);
1522                         else /* transmission finished */
1523                         {
1524                                 reg_sser_rw_intr_mask intr_mask;
1525                                 intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
1526                                 intr_mask.trdy = 0;
1527                                 REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
1528                                 wake_up_interruptible(&port->out_wait_q); /* Wake up application */
1529                         }
1530                 }
1531         }
1532         return IRQ_RETVAL(found);
1533 }
1534 #endif
1535
1536 module_init(etrax_sync_serial_init);