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;
  17 module_param(irq_chk_intv, int, 0644);
  18 MODULE_PARM_DESC(irq_chk_intv, "set the interval for IRQ watchdog (currently just debugging).");
  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 = 0;
  36 module_param(debug, int, 0644);
  37 MODULE_PARM_DESC(debug, "set debug level (1=info,2=regs,4=TS,8=irqdma (|-able))." DEBSTATUS);
  38
  39 #define DRIVER_VERSION "0.1"
  40 #define DRIVER_NAME "Technisat/B2C2 FlexCop II/IIb/III Digital TV PCI Driver"
  41 #define DRIVER_AUTHOR "Patrick Boettcher <patrick.boettcher@desy.de>"
  42
  43 struct flexcop_pci {
  44         struct pci_dev *pdev;
  45
  46 #define FC_PCI_INIT     0x01
  47 #define FC_PCI_DMA_INIT 0x02
  48         int init_state;
  49
  50         void __iomem *io_mem;
  51         u32 irq;
  52 /* buffersize (at least for DMA1, need to be % 188 == 0,
  53  * this logic is required */
  54 #define FC_DEFAULT_DMA1_BUFSIZE (1280 * 188)
  55 #define FC_DEFAULT_DMA2_BUFSIZE (10 * 188)
  56         struct flexcop_dma dma[2];
  57
  58         int active_dma1_addr; /* 0 = addr0 of dma1; 1 = addr1 of dma1 */
  59         u32 last_dma1_cur_pos; /* position of the pointer last time the timer/packet irq occured */
  60         int count;
  61
  62         spinlock_t irq_lock;
  63
  64         unsigned long last_irq;
  65
  66         struct delayed_work irq_check_work;
  67
  68         struct flexcop_device *fc_dev;
  69 };
  70
  71 static int lastwreg,lastwval,lastrreg,lastrval;
  72
  73 static flexcop_ibi_value flexcop_pci_read_ibi_reg (struct flexcop_device *fc, flexcop_ibi_register r)
  74 {
  75         struct flexcop_pci *fc_pci = fc->bus_specific;
  76         flexcop_ibi_value v;
  77         v.raw = readl(fc_pci->io_mem + r);
  78
  79         if (lastrreg != r || lastrval != v.raw) {
  80                 lastrreg = r; lastrval = v.raw;
  81                 deb_reg("new rd: %3x: %08x\n",r,v.raw);
  82         }
  83
  84         return v;
  85 }
  86
  87 static int flexcop_pci_write_ibi_reg(struct flexcop_device *fc, flexcop_ibi_register r, flexcop_ibi_value v)
  88 {
  89         struct flexcop_pci *fc_pci = fc->bus_specific;
  90
  91         if (lastwreg != r || lastwval != v.raw) {
  92                 lastwreg = r; lastwval = v.raw;
  93                 deb_reg("new wr: %3x: %08x\n",r,v.raw);
  94         }
  95
  96         writel(v.raw, fc_pci->io_mem + r);
  97         return 0;
  98 }
  99
 100 static void flexcop_pci_irq_check_work(struct work_struct *work)
 101 {
 102         struct flexcop_pci *fc_pci =
 103                 container_of(work, struct flexcop_pci, irq_check_work.work);
 104         struct flexcop_device *fc = fc_pci->fc_dev;
 105
 106         flexcop_ibi_value v = fc->read_ibi_reg(fc,sram_dest_reg_714);
 107
 108         flexcop_dump_reg(fc_pci->fc_dev,dma1_000,4);
 109
 110         if (v.sram_dest_reg_714.net_ovflow_error)
 111                 deb_chk("sram net_ovflow_error\n");
 112         if (v.sram_dest_reg_714.media_ovflow_error)
 113                 deb_chk("sram media_ovflow_error\n");
 114         if (v.sram_dest_reg_714.cai_ovflow_error)
 115                 deb_chk("sram cai_ovflow_error\n");
 116         if (v.sram_dest_reg_714.cai_ovflow_error)
 117                 deb_chk("sram cai_ovflow_error\n");
 118
 119         schedule_delayed_work(&fc_pci->irq_check_work,
 120                         msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));
 121 }
 122
 123 /* When PID filtering is turned on, we use the timer IRQ, because small amounts
 124  * of data need to be passed to the user space instantly as well. When PID
 125  * filtering is turned off, we use the page-change-IRQ */
 126 static irqreturn_t flexcop_pci_isr(int irq, void *dev_id)
 127 {
 128         struct flexcop_pci *fc_pci = dev_id;
 129         struct flexcop_device *fc = fc_pci->fc_dev;
 130         flexcop_ibi_value v;
 131         irqreturn_t ret = IRQ_HANDLED;
 132
 133         spin_lock_irq(&fc_pci->irq_lock);
 134
 135         v = fc->read_ibi_reg(fc,irq_20c);
 136
 137    /* errors */
 138         if (v.irq_20c.Data_receiver_error)
 139                 deb_chk("data receiver error\n");
 140         if (v.irq_20c.Continuity_error_flag)
 141                 deb_chk("Contunuity error flag is set\n");
 142         if (v.irq_20c.LLC_SNAP_FLAG_set)
 143                 deb_chk("LLC_SNAP_FLAG_set is set\n");
 144         if (v.irq_20c.Transport_Error)
 145                 deb_chk("Transport error\n");
 146
 147         if ((fc_pci->count % 1000) == 0)
 148                 deb_chk("%d valid irq took place so far\n",fc_pci->count);
 149
 150         if (v.irq_20c.DMA1_IRQ_Status == 1) {
 151                 if (fc_pci->active_dma1_addr == 0)
 152                         flexcop_pass_dmx_packets(fc_pci->fc_dev,fc_pci->dma[0].cpu_addr0,fc_pci->dma[0].size / 188);
 153                 else
 154                         flexcop_pass_dmx_packets(fc_pci->fc_dev,fc_pci->dma[0].cpu_addr1,fc_pci->dma[0].size / 188);
 155
 156                 deb_irq("page change to page: %d\n",!fc_pci->active_dma1_addr);
 157                 fc_pci->active_dma1_addr = !fc_pci->active_dma1_addr;
 158         } else if (v.irq_20c.DMA1_Timer_Status == 1) {
 159                 /* for the timer IRQ we only can use buffer dmx feeding, because we don't have
 160                  * complete TS packets when reading from the DMA memory */
 161                 dma_addr_t cur_addr =
 162                         fc->read_ibi_reg(fc,dma1_008).dma_0x8.dma_cur_addr << 2;
 163                 u32 cur_pos = cur_addr - fc_pci->dma[0].dma_addr0;
 164
 165                 deb_irq("%u irq: %08x cur_addr: %llx: cur_pos: %08x, last_cur_pos: %08x ",
 166                                 jiffies_to_usecs(jiffies - fc_pci->last_irq),
 167                                 v.raw, (unsigned long long)cur_addr, cur_pos,
 168                                 fc_pci->last_dma1_cur_pos);
 169                 fc_pci->last_irq = jiffies;
 170
 171                 /* buffer end was reached, restarted from the beginning
 172                  * pass the data from last_cur_pos to the buffer end to the demux
 173                  */
 174                 if (cur_pos < fc_pci->last_dma1_cur_pos) {
 175                         deb_irq(" end was reached: passing %d bytes ",(fc_pci->dma[0].size*2 - 1) - fc_pci->last_dma1_cur_pos);
 176                         flexcop_pass_dmx_data(fc_pci->fc_dev,
 177                                         fc_pci->dma[0].cpu_addr0 + fc_pci->last_dma1_cur_pos,
 178                                         (fc_pci->dma[0].size*2) - fc_pci->last_dma1_cur_pos);
 179                         fc_pci->last_dma1_cur_pos = 0;
 180                 }
 181
 182                 if (cur_pos > fc_pci->last_dma1_cur_pos) {
 183                         deb_irq(" passing %d bytes ",cur_pos - fc_pci->last_dma1_cur_pos);
 184                         flexcop_pass_dmx_data(fc_pci->fc_dev,
 185                                         fc_pci->dma[0].cpu_addr0 + fc_pci->last_dma1_cur_pos,
 186                                         cur_pos - fc_pci->last_dma1_cur_pos);
 187                 }
 188                 deb_irq("\n");
 189
 190                 fc_pci->last_dma1_cur_pos = cur_pos;
 191                 fc_pci->count++;
 192         } else {
 193                 deb_irq("isr for flexcop called, apparently without reason (%08x)\n",v.raw);
 194                 ret = IRQ_NONE;
 195         }
 196
 197         spin_unlock_irq(&fc_pci->irq_lock);
 198
 199         return ret;
 200 }
 201
 202 static int flexcop_pci_stream_control(struct flexcop_device *fc, int onoff)
 203 {
 204         struct flexcop_pci *fc_pci = fc->bus_specific;
 205         if (onoff) {
 206                 flexcop_dma_config(fc,&fc_pci->dma[0],FC_DMA_1);
 207                 flexcop_dma_config(fc,&fc_pci->dma[1],FC_DMA_2);
 208
 209                 flexcop_dma_config_timer(fc,FC_DMA_1,0);
 210
 211                 flexcop_dma_xfer_control(fc,FC_DMA_1,FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1,1);
 212                 deb_irq("DMA xfer enabled\n");
 213
 214                 fc_pci->last_dma1_cur_pos = 0;
 215                 flexcop_dma_control_timer_irq(fc,FC_DMA_1,1);
 216                 deb_irq("IRQ enabled\n");
 217
 218 //              fc_pci->active_dma1_addr = 0;
 219 //              flexcop_dma_control_size_irq(fc,FC_DMA_1,1);
 220
 221                 if (irq_chk_intv > 0)
 222                         schedule_delayed_work(&fc_pci->irq_check_work,
 223                                         msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));
 224         } else {
 225                 if (irq_chk_intv > 0)
 226                         cancel_delayed_work(&fc_pci->irq_check_work);
 227
 228                 flexcop_dma_control_timer_irq(fc,FC_DMA_1,0);
 229                 deb_irq("IRQ disabled\n");
 230
 231 //              flexcop_dma_control_size_irq(fc,FC_DMA_1,0);
 232
 233                 flexcop_dma_xfer_control(fc,FC_DMA_1,FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1,0);
 234                 deb_irq("DMA xfer disabled\n");
 235         }
 236
 237         return 0;
 238 }
 239
 240 static int flexcop_pci_dma_init(struct flexcop_pci *fc_pci)
 241 {
 242         int ret;
 243         if ((ret = flexcop_dma_allocate(fc_pci->pdev,&fc_pci->dma[0],FC_DEFAULT_DMA1_BUFSIZE)) != 0)
 244                 return ret;
 245
 246         if ((ret = flexcop_dma_allocate(fc_pci->pdev,&fc_pci->dma[1],FC_DEFAULT_DMA2_BUFSIZE)) != 0) {
 247                 flexcop_dma_free(&fc_pci->dma[0]);
 248                 return ret;
 249         }
 250
 251         flexcop_sram_set_dest(fc_pci->fc_dev,FC_SRAM_DEST_MEDIA | FC_SRAM_DEST_NET, FC_SRAM_DEST_TARGET_DMA1);
 252         flexcop_sram_set_dest(fc_pci->fc_dev,FC_SRAM_DEST_CAO   | FC_SRAM_DEST_CAI, FC_SRAM_DEST_TARGET_DMA2);
 253
 254         fc_pci->init_state |= FC_PCI_DMA_INIT;
 255
 256         return ret;
 257 }
 258
 259 static void flexcop_pci_dma_exit(struct flexcop_pci *fc_pci)
 260 {
 261         if (fc_pci->init_state & FC_PCI_DMA_INIT) {
 262                 flexcop_dma_free(&fc_pci->dma[0]);
 263                 flexcop_dma_free(&fc_pci->dma[1]);
 264         }
 265         fc_pci->init_state &= ~FC_PCI_DMA_INIT;
 266 }
 267
 268 static int flexcop_pci_init(struct flexcop_pci *fc_pci)
 269 {
 270         int ret;
 271         u8 card_rev;
 272
 273         pci_read_config_byte(fc_pci->pdev, PCI_CLASS_REVISION, &card_rev);
 274         info("card revision %x", card_rev);
 275
 276         if ((ret = pci_enable_device(fc_pci->pdev)) != 0)
 277                 return ret;
 278
 279         pci_set_master(fc_pci->pdev);
 280
 281         /* enable interrupts */
 282         // pci_write_config_dword(pdev, 0x6c, 0x8000);
 283
 284         if ((ret = pci_request_regions(fc_pci->pdev, DRIVER_NAME)) != 0)
 285                 goto err_pci_disable_device;
 286
 287         fc_pci->io_mem = pci_iomap(fc_pci->pdev, 0, 0x800);
 288
 289         if (!fc_pci->io_mem) {
 290                 err("cannot map io memory\n");
 291                 ret = -EIO;
 292                 goto err_pci_release_regions;
 293         }
 294
 295         pci_set_drvdata(fc_pci->pdev, fc_pci);
 296
 297         if ((ret = request_irq(fc_pci->pdev->irq, flexcop_pci_isr,
 298                                         IRQF_SHARED, DRIVER_NAME, fc_pci)) != 0)
 299                 goto err_pci_iounmap;
 300
 301         spin_lock_init(&fc_pci->irq_lock);
 302
 303         fc_pci->init_state |= FC_PCI_INIT;
 304         return ret;
 305
 306 err_pci_iounmap:
 307         pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
 308         pci_set_drvdata(fc_pci->pdev, NULL);
 309 err_pci_release_regions:
 310         pci_release_regions(fc_pci->pdev);
 311 err_pci_disable_device:
 312         pci_disable_device(fc_pci->pdev);
 313         return ret;
 314 }
 315
 316 static void flexcop_pci_exit(struct flexcop_pci *fc_pci)
 317 {
 318         if (fc_pci->init_state & FC_PCI_INIT) {
 319                 free_irq(fc_pci->pdev->irq, fc_pci);
 320                 pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
 321                 pci_set_drvdata(fc_pci->pdev, NULL);
 322                 pci_release_regions(fc_pci->pdev);
 323                 pci_disable_device(fc_pci->pdev);
 324         }
 325         fc_pci->init_state &= ~FC_PCI_INIT;
 326 }
 327
 328
 329 static int flexcop_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 330 {
 331         struct flexcop_device *fc;
 332         struct flexcop_pci *fc_pci;
 333         int ret = -ENOMEM;
 334
 335         if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_pci))) == NULL) {
 336                 err("out of memory\n");
 337                 return -ENOMEM;
 338         }
 339
 340 /* general flexcop init */
 341         fc_pci = fc->bus_specific;
 342         fc_pci->fc_dev = fc;
 343
 344         fc->read_ibi_reg = flexcop_pci_read_ibi_reg;
 345         fc->write_ibi_reg = flexcop_pci_write_ibi_reg;
 346         fc->i2c_request = flexcop_i2c_request;
 347         fc->get_mac_addr = flexcop_eeprom_check_mac_addr;
 348
 349         fc->stream_control = flexcop_pci_stream_control;
 350
 351         if (enable_pid_filtering)
 352                 info("will use the HW PID filter.");
 353         else
 354                 info("will pass the complete TS to the demuxer.");
 355
 356         fc->pid_filtering = enable_pid_filtering;
 357         fc->bus_type = FC_PCI;
 358
 359         fc->dev = &pdev->dev;
 360         fc->owner = THIS_MODULE;
 361
 362 /* bus specific part */
 363         fc_pci->pdev = pdev;
 364         if ((ret = flexcop_pci_init(fc_pci)) != 0)
 365                 goto err_kfree;
 366
 367 /* init flexcop */
 368         if ((ret = flexcop_device_initialize(fc)) != 0)
 369                 goto err_pci_exit;
 370
 371 /* init dma */
 372         if ((ret = flexcop_pci_dma_init(fc_pci)) != 0)
 373                 goto err_fc_exit;
 374
 375         INIT_DELAYED_WORK(&fc_pci->irq_check_work, flexcop_pci_irq_check_work);
 376
 377         return ret;
 378
 379 err_fc_exit:
 380         flexcop_device_exit(fc);
 381 err_pci_exit:
 382         flexcop_pci_exit(fc_pci);
 383 err_kfree:
 384         flexcop_device_kfree(fc);
 385         return ret;
 386 }
 387
 388 /* in theory every _exit function should be called exactly two times,
 389  * here and in the bail-out-part of the _init-function
 390  */
 391 static void flexcop_pci_remove(struct pci_dev *pdev)
 392 {
 393         struct flexcop_pci *fc_pci = pci_get_drvdata(pdev);
 394
 395         flexcop_pci_dma_exit(fc_pci);
 396         flexcop_device_exit(fc_pci->fc_dev);
 397         flexcop_pci_exit(fc_pci);
 398         flexcop_device_kfree(fc_pci->fc_dev);
 399 }
 400
 401 static struct pci_device_id flexcop_pci_tbl[] = {
 402         { PCI_DEVICE(0x13d0, 0x2103) },
 403 /*      { PCI_DEVICE(0x13d0, 0x2200) }, ? */
 404         { },
 405 };
 406
 407 MODULE_DEVICE_TABLE(pci, flexcop_pci_tbl);
 408
 409 static struct pci_driver flexcop_pci_driver = {
 410         .name     = "b2c2_flexcop_pci",
 411         .id_table = flexcop_pci_tbl,
 412         .probe    = flexcop_pci_probe,
 413         .remove   = flexcop_pci_remove,
 414 };
 415
 416 static int __init flexcop_pci_module_init(void)
 417 {
 418         return pci_register_driver(&flexcop_pci_driver);
 419 }
 420
 421 static void __exit flexcop_pci_module_exit(void)
 422 {
 423         pci_unregister_driver(&flexcop_pci_driver);
 424 }
 425
 426 module_init(flexcop_pci_module_init);
 427 module_exit(flexcop_pci_module_exit);
 428
 429 MODULE_AUTHOR(DRIVER_AUTHOR);
 430 MODULE_DESCRIPTION(DRIVER_NAME);
 431 MODULE_LICENSE("GPL");