drivers/media/dvb/b2c2/flexcop-pci.c

   1 /*
   2  * This file is part of linux driver the digital TV devices equipped with B2C2 FlexcopII(b)/III
   3  *
   4  * flexcop-pci.c - covers the PCI part including DMA transfers.
   5  *
   6  * see flexcop.c for copyright information.
   7  */
   8
   9 #define FC_LOG_PREFIX "flexcop-pci"
  10 #include "flexcop-common.h"
  11
  12 static int enable_pid_filtering = 1;
  13 module_param(enable_pid_filtering, int, 0444);
  14 MODULE_PARM_DESC(enable_pid_filtering, "enable hardware pid filtering: supported values: 0 (fullts), 1");
  15
  16 static int irq_chk_intv = 100;
  17 module_param(irq_chk_intv, int, 0644);
  18 MODULE_PARM_DESC(irq_chk_intv, "set the interval for IRQ streaming watchdog.");
  19
  20 #ifdef CONFIG_DVB_B2C2_FLEXCOP_DEBUG
  21 #define dprintk(level,args...) \
  22         do { if ((debug & level)) printk(args); } while (0)
  23 #define DEBSTATUS ""
  24 #else
  25 #define dprintk(level,args...)
  26 #define DEBSTATUS " (debugging is not enabled)"
  27 #endif
  28
  29 #define deb_info(args...)  dprintk(0x01,args)
  30 #define deb_reg(args...)   dprintk(0x02,args)
  31 #define deb_ts(args...)    dprintk(0x04,args)
  32 #define deb_irq(args...)   dprintk(0x08,args)
  33 #define deb_chk(args...)   dprintk(0x10,args)
  34
  35 static int debug;
  36 module_param(debug, int, 0644);
  37 MODULE_PARM_DESC(debug,
  38         "set debug level (1=info,2=regs,4=TS,8=irqdma,16=check (|-able))."
  39          DEBSTATUS);
  40
  41 #define DRIVER_VERSION "0.1"
  42 #define DRIVER_NAME "Technisat/B2C2 FlexCop II/IIb/III Digital TV PCI Driver"
  43 #define DRIVER_AUTHOR "Patrick Boettcher <patrick.boettcher@desy.de>"
  44
  45 struct flexcop_pci {
  46         struct pci_dev *pdev;
  47
  48 #define FC_PCI_INIT     0x01
  49 #define FC_PCI_DMA_INIT 0x02
  50         int init_state;
  51
  52         void __iomem *io_mem;
  53         u32 irq;
  54 /* buffersize (at least for DMA1, need to be % 188 == 0,
  55  * this logic is required */
  56 #define FC_DEFAULT_DMA1_BUFSIZE (1280 * 188)
  57 #define FC_DEFAULT_DMA2_BUFSIZE (10 * 188)
  58         struct flexcop_dma dma[2];
  59
  60         int active_dma1_addr; /* 0 = addr0 of dma1; 1 = addr1 of dma1 */
  61         u32 last_dma1_cur_pos; /* position of the pointer last time the timer/packet irq occured */
  62         int count;
  63         int count_prev;
  64         int stream_problem;
  65
  66         spinlock_t irq_lock;
  67
  68         unsigned long last_irq;
  69
  70         struct delayed_work irq_check_work;
  71
  72         struct flexcop_device *fc_dev;
  73 };
  74
  75 static int lastwreg,lastwval,lastrreg,lastrval;
  76
  77 static flexcop_ibi_value flexcop_pci_read_ibi_reg (struct flexcop_device *fc, flexcop_ibi_register r)
  78 {
  79         struct flexcop_pci *fc_pci = fc->bus_specific;
  80         flexcop_ibi_value v;
  81         v.raw = readl(fc_pci->io_mem + r);
  82
  83         if (lastrreg != r || lastrval != v.raw) {
  84                 lastrreg = r; lastrval = v.raw;
  85                 deb_reg("new rd: %3x: %08x\n",r,v.raw);
  86         }
  87
  88         return v;
  89 }
  90
  91 static int flexcop_pci_write_ibi_reg(struct flexcop_device *fc, flexcop_ibi_register r, flexcop_ibi_value v)
  92 {
  93         struct flexcop_pci *fc_pci = fc->bus_specific;
  94
  95         if (lastwreg != r || lastwval != v.raw) {
  96                 lastwreg = r; lastwval = v.raw;
  97                 deb_reg("new wr: %3x: %08x\n",r,v.raw);
  98         }
  99
 100         writel(v.raw, fc_pci->io_mem + r);
 101         return 0;
 102 }
 103
 104 static void flexcop_pci_irq_check_work(struct work_struct *work)
 105 {
 106         struct flexcop_pci *fc_pci =
 107                 container_of(work, struct flexcop_pci, irq_check_work.work);
 108         struct flexcop_device *fc = fc_pci->fc_dev;
 109
 110         if (fc->feedcount) {
 111
 112                 if (fc_pci->count == fc_pci->count_prev) {
 113                         deb_chk("no IRQ since the last check\n");
 114                         if (fc_pci->stream_problem++ == 3) {
 115                                 struct dvb_demux_feed *feed;
 116
 117                                 spin_lock_irq(&fc->demux.lock);
 118                                 list_for_each_entry(feed, &fc->demux.feed_list,
 119                                         list_head) {
 120                                         flexcop_pid_feed_control(fc, feed, 0);
 121                                 }
 122
 123                                 list_for_each_entry(feed, &fc->demux.feed_list,
 124                                         list_head) {
 125                                         flexcop_pid_feed_control(fc, feed, 1);
 126                                 }
 127                                 spin_unlock_irq(&fc->demux.lock);
 128
 129                                 fc_pci->stream_problem = 0;
 130                         }
 131                 } else {
 132                         fc_pci->stream_problem = 0;
 133                         fc_pci->count_prev = fc_pci->count;
 134                 }
 135         }
 136
 137         schedule_delayed_work(&fc_pci->irq_check_work,
 138                         msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));
 139 }
 140
 141 /* When PID filtering is turned on, we use the timer IRQ, because small amounts
 142  * of data need to be passed to the user space instantly as well. When PID
 143  * filtering is turned off, we use the page-change-IRQ */
 144 static irqreturn_t flexcop_pci_isr(int irq, void *dev_id)
 145 {
 146         struct flexcop_pci *fc_pci = dev_id;
 147         struct flexcop_device *fc = fc_pci->fc_dev;
 148         unsigned long flags;
 149         flexcop_ibi_value v;
 150         irqreturn_t ret = IRQ_HANDLED;
 151
 152         spin_lock_irqsave(&fc_pci->irq_lock,flags);
 153
 154         v = fc->read_ibi_reg(fc,irq_20c);
 155
 156    /* errors */
 157         if (v.irq_20c.Data_receiver_error)
 158                 deb_chk("data receiver error\n");
 159         if (v.irq_20c.Continuity_error_flag)
 160                 deb_chk("Contunuity error flag is set\n");
 161         if (v.irq_20c.LLC_SNAP_FLAG_set)
 162                 deb_chk("LLC_SNAP_FLAG_set is set\n");
 163         if (v.irq_20c.Transport_Error)
 164                 deb_chk("Transport error\n");
 165
 166         if ((fc_pci->count % 1000) == 0)
 167                 deb_chk("%d valid irq took place so far\n",fc_pci->count);
 168
 169         if (v.irq_20c.DMA1_IRQ_Status == 1) {
 170                 if (fc_pci->active_dma1_addr == 0)
 171                         flexcop_pass_dmx_packets(fc_pci->fc_dev,fc_pci->dma[0].cpu_addr0,fc_pci->dma[0].size / 188);
 172                 else
 173                         flexcop_pass_dmx_packets(fc_pci->fc_dev,fc_pci->dma[0].cpu_addr1,fc_pci->dma[0].size / 188);
 174
 175                 deb_irq("page change to page: %d\n",!fc_pci->active_dma1_addr);
 176                 fc_pci->active_dma1_addr = !fc_pci->active_dma1_addr;
 177         } else if (v.irq_20c.DMA1_Timer_Status == 1) {
 178                 /* for the timer IRQ we only can use buffer dmx feeding, because we don't have
 179                  * complete TS packets when reading from the DMA memory */
 180                 dma_addr_t cur_addr =
 181                         fc->read_ibi_reg(fc,dma1_008).dma_0x8.dma_cur_addr << 2;
 182                 u32 cur_pos = cur_addr - fc_pci->dma[0].dma_addr0;
 183
 184                 deb_irq("%u irq: %08x cur_addr: %llx: cur_pos: %08x, last_cur_pos: %08x ",
 185                                 jiffies_to_usecs(jiffies - fc_pci->last_irq),
 186                                 v.raw, (unsigned long long)cur_addr, cur_pos,
 187                                 fc_pci->last_dma1_cur_pos);
 188                 fc_pci->last_irq = jiffies;
 189
 190                 /* buffer end was reached, restarted from the beginning
 191                  * pass the data from last_cur_pos to the buffer end to the demux
 192                  */
 193                 if (cur_pos < fc_pci->last_dma1_cur_pos) {
 194                         deb_irq(" end was reached: passing %d bytes ",(fc_pci->dma[0].size*2 - 1) - fc_pci->last_dma1_cur_pos);
 195                         flexcop_pass_dmx_data(fc_pci->fc_dev,
 196                                         fc_pci->dma[0].cpu_addr0 + fc_pci->last_dma1_cur_pos,
 197                                         (fc_pci->dma[0].size*2) - fc_pci->last_dma1_cur_pos);
 198                         fc_pci->last_dma1_cur_pos = 0;
 199                 }
 200
 201                 if (cur_pos > fc_pci->last_dma1_cur_pos) {
 202                         deb_irq(" passing %d bytes ",cur_pos - fc_pci->last_dma1_cur_pos);
 203                         flexcop_pass_dmx_data(fc_pci->fc_dev,
 204                                         fc_pci->dma[0].cpu_addr0 + fc_pci->last_dma1_cur_pos,
 205                                         cur_pos - fc_pci->last_dma1_cur_pos);
 206                 }
 207                 deb_irq("\n");
 208
 209                 fc_pci->last_dma1_cur_pos = cur_pos;
 210                 fc_pci->count++;
 211         } else {
 212                 deb_irq("isr for flexcop called, apparently without reason (%08x)\n",v.raw);
 213                 ret = IRQ_NONE;
 214         }
 215
 216         spin_unlock_irqrestore(&fc_pci->irq_lock,flags);
 217
 218         return ret;
 219 }
 220
 221 static int flexcop_pci_stream_control(struct flexcop_device *fc, int onoff)
 222 {
 223         struct flexcop_pci *fc_pci = fc->bus_specific;
 224         if (onoff) {
 225                 flexcop_dma_config(fc,&fc_pci->dma[0],FC_DMA_1);
 226                 flexcop_dma_config(fc,&fc_pci->dma[1],FC_DMA_2);
 227
 228                 flexcop_dma_config_timer(fc,FC_DMA_1,0);
 229
 230                 flexcop_dma_xfer_control(fc,FC_DMA_1,FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1,1);
 231                 deb_irq("DMA xfer enabled\n");
 232
 233                 fc_pci->last_dma1_cur_pos = 0;
 234                 flexcop_dma_control_timer_irq(fc,FC_DMA_1,1);
 235                 deb_irq("IRQ enabled\n");
 236
 237                 fc_pci->count_prev = fc_pci->count;
 238
 239 //              fc_pci->active_dma1_addr = 0;
 240 //              flexcop_dma_control_size_irq(fc,FC_DMA_1,1);
 241
 242         } else {
 243                 flexcop_dma_control_timer_irq(fc,FC_DMA_1,0);
 244                 deb_irq("IRQ disabled\n");
 245
 246 //              flexcop_dma_control_size_irq(fc,FC_DMA_1,0);
 247
 248                 flexcop_dma_xfer_control(fc,FC_DMA_1,FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1,0);
 249                 deb_irq("DMA xfer disabled\n");
 250         }
 251
 252         return 0;
 253 }
 254
 255 static int flexcop_pci_dma_init(struct flexcop_pci *fc_pci)
 256 {
 257         int ret;
 258         if ((ret = flexcop_dma_allocate(fc_pci->pdev,&fc_pci->dma[0],FC_DEFAULT_DMA1_BUFSIZE)) != 0)
 259                 return ret;
 260
 261         if ((ret = flexcop_dma_allocate(fc_pci->pdev,&fc_pci->dma[1],FC_DEFAULT_DMA2_BUFSIZE)) != 0) {
 262                 flexcop_dma_free(&fc_pci->dma[0]);
 263                 return ret;
 264         }
 265
 266         flexcop_sram_set_dest(fc_pci->fc_dev,FC_SRAM_DEST_MEDIA | FC_SRAM_DEST_NET, FC_SRAM_DEST_TARGET_DMA1);
 267         flexcop_sram_set_dest(fc_pci->fc_dev,FC_SRAM_DEST_CAO   | FC_SRAM_DEST_CAI, FC_SRAM_DEST_TARGET_DMA2);
 268
 269         fc_pci->init_state |= FC_PCI_DMA_INIT;
 270
 271         return ret;
 272 }
 273
 274 static void flexcop_pci_dma_exit(struct flexcop_pci *fc_pci)
 275 {
 276         if (fc_pci->init_state & FC_PCI_DMA_INIT) {
 277                 flexcop_dma_free(&fc_pci->dma[0]);
 278                 flexcop_dma_free(&fc_pci->dma[1]);
 279         }
 280         fc_pci->init_state &= ~FC_PCI_DMA_INIT;
 281 }
 282
 283 static int flexcop_pci_init(struct flexcop_pci *fc_pci)
 284 {
 285         int ret;
 286         u8 card_rev;
 287
 288         pci_read_config_byte(fc_pci->pdev, PCI_CLASS_REVISION, &card_rev);
 289         info("card revision %x", card_rev);
 290
 291         if ((ret = pci_enable_device(fc_pci->pdev)) != 0)
 292                 return ret;
 293
 294         pci_set_master(fc_pci->pdev);
 295
 296         /* enable interrupts */
 297         // pci_write_config_dword(pdev, 0x6c, 0x8000);
 298
 299         if ((ret = pci_request_regions(fc_pci->pdev, DRIVER_NAME)) != 0)
 300                 goto err_pci_disable_device;
 301
 302         fc_pci->io_mem = pci_iomap(fc_pci->pdev, 0, 0x800);
 303
 304         if (!fc_pci->io_mem) {
 305                 err("cannot map io memory\n");
 306                 ret = -EIO;
 307                 goto err_pci_release_regions;
 308         }
 309
 310         pci_set_drvdata(fc_pci->pdev, fc_pci);
 311         spin_lock_init(&fc_pci->irq_lock);
 312         if ((ret = request_irq(fc_pci->pdev->irq, flexcop_pci_isr,
 313                                         IRQF_SHARED, DRIVER_NAME, fc_pci)) != 0)
 314                 goto err_pci_iounmap;
 315
 316         fc_pci->init_state |= FC_PCI_INIT;
 317         return ret;
 318
 319 err_pci_iounmap:
 320         pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
 321         pci_set_drvdata(fc_pci->pdev, NULL);
 322 err_pci_release_regions:
 323         pci_release_regions(fc_pci->pdev);
 324 err_pci_disable_device:
 325         pci_disable_device(fc_pci->pdev);
 326         return ret;
 327 }
 328
 329 static void flexcop_pci_exit(struct flexcop_pci *fc_pci)
 330 {
 331         if (fc_pci->init_state & FC_PCI_INIT) {
 332                 free_irq(fc_pci->pdev->irq, fc_pci);
 333                 pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
 334                 pci_set_drvdata(fc_pci->pdev, NULL);
 335                 pci_release_regions(fc_pci->pdev);
 336                 pci_disable_device(fc_pci->pdev);
 337         }
 338         fc_pci->init_state &= ~FC_PCI_INIT;
 339 }
 340
 341
 342 static int flexcop_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 343 {
 344         struct flexcop_device *fc;
 345         struct flexcop_pci *fc_pci;
 346         int ret = -ENOMEM;
 347
 348         if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_pci))) == NULL) {
 349                 err("out of memory\n");
 350                 return -ENOMEM;
 351         }
 352
 353 /* general flexcop init */
 354         fc_pci = fc->bus_specific;
 355         fc_pci->fc_dev = fc;
 356
 357         fc->read_ibi_reg = flexcop_pci_read_ibi_reg;
 358         fc->write_ibi_reg = flexcop_pci_write_ibi_reg;
 359         fc->i2c_request = flexcop_i2c_request;
 360         fc->get_mac_addr = flexcop_eeprom_check_mac_addr;
 361
 362         fc->stream_control = flexcop_pci_stream_control;
 363
 364         if (enable_pid_filtering)
 365                 info("will use the HW PID filter.");
 366         else
 367                 info("will pass the complete TS to the demuxer.");
 368
 369         fc->pid_filtering = enable_pid_filtering;
 370         fc->bus_type = FC_PCI;
 371
 372         fc->dev = &pdev->dev;
 373         fc->owner = THIS_MODULE;
 374
 375 /* bus specific part */
 376         fc_pci->pdev = pdev;
 377         if ((ret = flexcop_pci_init(fc_pci)) != 0)
 378                 goto err_kfree;
 379
 380 /* init flexcop */
 381         if ((ret = flexcop_device_initialize(fc)) != 0)
 382                 goto err_pci_exit;
 383
 384 /* init dma */
 385         if ((ret = flexcop_pci_dma_init(fc_pci)) != 0)
 386                 goto err_fc_exit;
 387
 388         INIT_DELAYED_WORK(&fc_pci->irq_check_work, flexcop_pci_irq_check_work);
 389
 390                 if (irq_chk_intv > 0)
 391                         schedule_delayed_work(&fc_pci->irq_check_work,
 392                 msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));
 393
 394         return ret;
 395
 396 err_fc_exit:
 397         flexcop_device_exit(fc);
 398 err_pci_exit:
 399         flexcop_pci_exit(fc_pci);
 400 err_kfree:
 401         flexcop_device_kfree(fc);
 402         return ret;
 403 }
 404
 405 /* in theory every _exit function should be called exactly two times,
 406  * here and in the bail-out-part of the _init-function
 407  */
 408 static void flexcop_pci_remove(struct pci_dev *pdev)
 409 {
 410         struct flexcop_pci *fc_pci = pci_get_drvdata(pdev);
 411
 412         if (irq_chk_intv > 0)
 413                 cancel_delayed_work(&fc_pci->irq_check_work);
 414
 415         flexcop_pci_dma_exit(fc_pci);
 416         flexcop_device_exit(fc_pci->fc_dev);
 417         flexcop_pci_exit(fc_pci);
 418         flexcop_device_kfree(fc_pci->fc_dev);
 419 }
 420
 421 static struct pci_device_id flexcop_pci_tbl[] = {
 422         { PCI_DEVICE(0x13d0, 0x2103) },
 423 /*      { PCI_DEVICE(0x13d0, 0x2200) }, ? */
 424         { },
 425 };
 426
 427 MODULE_DEVICE_TABLE(pci, flexcop_pci_tbl);
 428
 429 static struct pci_driver flexcop_pci_driver = {
 430         .name     = "b2c2_flexcop_pci",
 431         .id_table = flexcop_pci_tbl,
 432         .probe    = flexcop_pci_probe,
 433         .remove   = flexcop_pci_remove,
 434 };
 435
 436 static int __init flexcop_pci_module_init(void)
 437 {
 438         return pci_register_driver(&flexcop_pci_driver);
 439 }
 440
 441 static void __exit flexcop_pci_module_exit(void)
 442 {
 443         pci_unregister_driver(&flexcop_pci_driver);
 444 }
 445
 446 module_init(flexcop_pci_module_init);
 447 module_exit(flexcop_pci_module_exit);
 448
 449 MODULE_AUTHOR(DRIVER_AUTHOR);
 450 MODULE_DESCRIPTION(DRIVER_NAME);
 451 MODULE_LICENSE("GPL");