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@posteo.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("Continuity 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, last_cur_pos: %08x ",
 189                                 jiffies_to_usecs(jiffies - fc_pci->last_irq),
 190                                 v.raw, (unsigned long long)cur_addr, cur_pos,
 191                                 fc_pci->last_dma1_cur_pos);
 192                 fc_pci->last_irq = jiffies;
 193
 194                 /* buffer end was reached, restarted from the beginning
 195                  * pass the data from last_cur_pos to the buffer end to the demux
 196                  */
 197                 if (cur_pos < fc_pci->last_dma1_cur_pos) {
 198                         deb_irq(" end was reached: passing %d bytes ",
 199                                 (fc_pci->dma[0].size*2 - 1) -
 200                                 fc_pci->last_dma1_cur_pos);
 201                         flexcop_pass_dmx_data(fc_pci->fc_dev,
 202                                 fc_pci->dma[0].cpu_addr0 +
 203                                         fc_pci->last_dma1_cur_pos,
 204                                 (fc_pci->dma[0].size*2) -
 205                                         fc_pci->last_dma1_cur_pos);
 206                         fc_pci->last_dma1_cur_pos = 0;
 207                 }
 208
 209                 if (cur_pos > fc_pci->last_dma1_cur_pos) {
 210                         deb_irq(" passing %d bytes ",
 211                                 cur_pos - fc_pci->last_dma1_cur_pos);
 212                         flexcop_pass_dmx_data(fc_pci->fc_dev,
 213                                 fc_pci->dma[0].cpu_addr0 +
 214                                         fc_pci->last_dma1_cur_pos,
 215                                 cur_pos - fc_pci->last_dma1_cur_pos);
 216                 }
 217                 deb_irq("\n");
 218
 219                 fc_pci->last_dma1_cur_pos = cur_pos;
 220                 fc_pci->count++;
 221         } else {
 222                 deb_irq("isr for flexcop called, apparently without reason (%08x)\n",
 223                         v.raw);
 224                 ret = IRQ_NONE;
 225         }
 226
 227         spin_unlock_irqrestore(&fc_pci->irq_lock, flags);
 228         return ret;
 229 }
 230
 231 static int flexcop_pci_stream_control(struct flexcop_device *fc, int onoff)
 232 {
 233         struct flexcop_pci *fc_pci = fc->bus_specific;
 234         if (onoff) {
 235                 flexcop_dma_config(fc, &fc_pci->dma[0], FC_DMA_1);
 236                 flexcop_dma_config(fc, &fc_pci->dma[1], FC_DMA_2);
 237                 flexcop_dma_config_timer(fc, FC_DMA_1, 0);
 238                 flexcop_dma_xfer_control(fc, FC_DMA_1,
 239                                 FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1, 1);
 240                 deb_irq("DMA xfer enabled\n");
 241
 242                 fc_pci->last_dma1_cur_pos = 0;
 243                 flexcop_dma_control_timer_irq(fc, FC_DMA_1, 1);
 244                 deb_irq("IRQ enabled\n");
 245                 fc_pci->count_prev = fc_pci->count;
 246         } else {
 247                 flexcop_dma_control_timer_irq(fc, FC_DMA_1, 0);
 248                 deb_irq("IRQ disabled\n");
 249
 250                 flexcop_dma_xfer_control(fc, FC_DMA_1,
 251                          FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1, 0);
 252                 deb_irq("DMA xfer disabled\n");
 253         }
 254         return 0;
 255 }
 256
 257 static int flexcop_pci_dma_init(struct flexcop_pci *fc_pci)
 258 {
 259         int ret;
 260         ret = flexcop_dma_allocate(fc_pci->pdev, &fc_pci->dma[0],
 261                         FC_DEFAULT_DMA1_BUFSIZE);
 262         if (ret != 0)
 263                 return ret;
 264
 265         ret = flexcop_dma_allocate(fc_pci->pdev, &fc_pci->dma[1],
 266                         FC_DEFAULT_DMA2_BUFSIZE);
 267         if (ret != 0) {
 268                 flexcop_dma_free(&fc_pci->dma[0]);
 269                 return ret;
 270         }
 271
 272         flexcop_sram_set_dest(fc_pci->fc_dev, FC_SRAM_DEST_MEDIA |
 273                         FC_SRAM_DEST_NET, FC_SRAM_DEST_TARGET_DMA1);
 274         flexcop_sram_set_dest(fc_pci->fc_dev, FC_SRAM_DEST_CAO |
 275                         FC_SRAM_DEST_CAI, FC_SRAM_DEST_TARGET_DMA2);
 276         fc_pci->init_state |= FC_PCI_DMA_INIT;
 277         return ret;
 278 }
 279
 280 static void flexcop_pci_dma_exit(struct flexcop_pci *fc_pci)
 281 {
 282         if (fc_pci->init_state & FC_PCI_DMA_INIT) {
 283                 flexcop_dma_free(&fc_pci->dma[0]);
 284                 flexcop_dma_free(&fc_pci->dma[1]);
 285         }
 286         fc_pci->init_state &= ~FC_PCI_DMA_INIT;
 287 }
 288
 289 static int flexcop_pci_init(struct flexcop_pci *fc_pci)
 290 {
 291         int ret;
 292
 293         info("card revision %x", fc_pci->pdev->revision);
 294
 295         if ((ret = pci_enable_device(fc_pci->pdev)) != 0)
 296                 return ret;
 297         pci_set_master(fc_pci->pdev);
 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 err_pci_release_regions:
 322         pci_release_regions(fc_pci->pdev);
 323 err_pci_disable_device:
 324         pci_disable_device(fc_pci->pdev);
 325         return ret;
 326 }
 327
 328 static void flexcop_pci_exit(struct flexcop_pci *fc_pci)
 329 {
 330         if (fc_pci->init_state & FC_PCI_INIT) {
 331                 free_irq(fc_pci->pdev->irq, fc_pci);
 332                 pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
 333                 pci_release_regions(fc_pci->pdev);
 334                 pci_disable_device(fc_pci->pdev);
 335         }
 336         fc_pci->init_state &= ~FC_PCI_INIT;
 337 }
 338
 339 static int flexcop_pci_probe(struct pci_dev *pdev,
 340                 const struct pci_device_id *ent)
 341 {
 342         struct flexcop_device *fc;
 343         struct flexcop_pci *fc_pci;
 344         int ret = -ENOMEM;
 345
 346         if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_pci))) == NULL) {
 347                 err("out of memory\n");
 348                 return -ENOMEM;
 349         }
 350
 351         /* general flexcop init */
 352         fc_pci = fc->bus_specific;
 353         fc_pci->fc_dev = fc;
 354
 355         fc->read_ibi_reg = flexcop_pci_read_ibi_reg;
 356         fc->write_ibi_reg = flexcop_pci_write_ibi_reg;
 357         fc->i2c_request = flexcop_i2c_request;
 358         fc->get_mac_addr = flexcop_eeprom_check_mac_addr;
 359         fc->stream_control = flexcop_pci_stream_control;
 360
 361         if (enable_pid_filtering)
 362                 info("will use the HW PID filter.");
 363         else
 364                 info("will pass the complete TS to the demuxer.");
 365
 366         fc->pid_filtering = enable_pid_filtering;
 367         fc->bus_type = FC_PCI;
 368         fc->dev = &pdev->dev;
 369         fc->owner = THIS_MODULE;
 370
 371         /* bus specific part */
 372         fc_pci->pdev = pdev;
 373         if ((ret = flexcop_pci_init(fc_pci)) != 0)
 374                 goto err_kfree;
 375
 376         /* init flexcop */
 377         if ((ret = flexcop_device_initialize(fc)) != 0)
 378                 goto err_pci_exit;
 379
 380         /* init dma */
 381         if ((ret = flexcop_pci_dma_init(fc_pci)) != 0)
 382                 goto err_fc_exit;
 383
 384         INIT_DELAYED_WORK(&fc_pci->irq_check_work, flexcop_pci_irq_check_work);
 385
 386         if (irq_chk_intv > 0)
 387                 schedule_delayed_work(&fc_pci->irq_check_work,
 388                                 msecs_to_jiffies(irq_chk_intv < 100 ?
 389                                         100 :
 390                                         irq_chk_intv));
 391         return ret;
 392
 393 err_fc_exit:
 394         flexcop_device_exit(fc);
 395 err_pci_exit:
 396         flexcop_pci_exit(fc_pci);
 397 err_kfree:
 398         flexcop_device_kfree(fc);
 399         return ret;
 400 }
 401
 402 /* in theory every _exit function should be called exactly two times,
 403  * here and in the bail-out-part of the _init-function
 404  */
 405 static void flexcop_pci_remove(struct pci_dev *pdev)
 406 {
 407         struct flexcop_pci *fc_pci = pci_get_drvdata(pdev);
 408
 409         if (irq_chk_intv > 0)
 410                 cancel_delayed_work(&fc_pci->irq_check_work);
 411
 412         flexcop_pci_dma_exit(fc_pci);
 413         flexcop_device_exit(fc_pci->fc_dev);
 414         flexcop_pci_exit(fc_pci);
 415         flexcop_device_kfree(fc_pci->fc_dev);
 416 }
 417
 418 static const struct pci_device_id flexcop_pci_tbl[] = {
 419         { PCI_DEVICE(0x13d0, 0x2103) },
 420         { },
 421 };
 422
 423 MODULE_DEVICE_TABLE(pci, flexcop_pci_tbl);
 424
 425 static struct pci_driver flexcop_pci_driver = {
 426         .name     = "b2c2_flexcop_pci",
 427         .id_table = flexcop_pci_tbl,
 428         .probe    = flexcop_pci_probe,
 429         .remove   = flexcop_pci_remove,
 430 };
 431
 432 module_pci_driver(flexcop_pci_driver);
 433
 434 MODULE_AUTHOR(DRIVER_AUTHOR);
 435 MODULE_DESCRIPTION(DRIVER_NAME);
 436 MODULE_LICENSE("GPL");