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

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