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 work_struct 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(void *data)
 101 {
 102         struct flexcop_pci *fc_pci = data;
 103         struct flexcop_device *fc = fc_pci->fc_dev;
 104
 105         flexcop_ibi_value v = fc->read_ibi_reg(fc,sram_dest_reg_714);
 106
 107         flexcop_dump_reg(fc_pci->fc_dev,dma1_000,4);
 108
 109         if (v.sram_dest_reg_714.net_ovflow_error)
 110                 deb_chk("sram net_ovflow_error\n");
 111         if (v.sram_dest_reg_714.media_ovflow_error)
 112                 deb_chk("sram media_ovflow_error\n");
 113         if (v.sram_dest_reg_714.cai_ovflow_error)
 114                 deb_chk("sram cai_ovflow_error\n");
 115         if (v.sram_dest_reg_714.cai_ovflow_error)
 116                 deb_chk("sram cai_ovflow_error\n");
 117
 118         schedule_delayed_work(&fc_pci->irq_check_work,
 119                         msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));
 120 }
 121
 122 /* When PID filtering is turned on, we use the timer IRQ, because small amounts
 123  * of data need to be passed to the user space instantly as well. When PID
 124  * filtering is turned off, we use the page-change-IRQ */
 125 static irqreturn_t flexcop_pci_isr(int irq, void *dev_id, struct pt_regs *regs)
 126 {
 127         struct flexcop_pci *fc_pci = dev_id;
 128         struct flexcop_device *fc = fc_pci->fc_dev;
 129         flexcop_ibi_value v;
 130         irqreturn_t ret = IRQ_HANDLED;
 131
 132         spin_lock_irq(&fc_pci->irq_lock);
 133
 134         v = fc->read_ibi_reg(fc,irq_20c);
 135
 136    /* errors */
 137         if (v.irq_20c.Data_receiver_error)
 138                 deb_chk("data receiver error\n");
 139         if (v.irq_20c.Continuity_error_flag)
 140                 deb_chk("Contunuity error flag is set\n");
 141         if (v.irq_20c.LLC_SNAP_FLAG_set)
 142                 deb_chk("LLC_SNAP_FLAG_set is set\n");
 143         if (v.irq_20c.Transport_Error)
 144                 deb_chk("Transport error\n");
 145
 146         if ((fc_pci->count % 1000) == 0)
 147                 deb_chk("%d valid irq took place so far\n",fc_pci->count);
 148
 149         if (v.irq_20c.DMA1_IRQ_Status == 1) {
 150                 if (fc_pci->active_dma1_addr == 0)
 151                         flexcop_pass_dmx_packets(fc_pci->fc_dev,fc_pci->dma[0].cpu_addr0,fc_pci->dma[0].size / 188);
 152                 else
 153                         flexcop_pass_dmx_packets(fc_pci->fc_dev,fc_pci->dma[0].cpu_addr1,fc_pci->dma[0].size / 188);
 154
 155                 deb_irq("page change to page: %d\n",!fc_pci->active_dma1_addr);
 156                 fc_pci->active_dma1_addr = !fc_pci->active_dma1_addr;
 157         } else if (v.irq_20c.DMA1_Timer_Status == 1) {
 158                 /* for the timer IRQ we only can use buffer dmx feeding, because we don't have
 159                  * complete TS packets when reading from the DMA memory */
 160                 dma_addr_t cur_addr =
 161                         fc->read_ibi_reg(fc,dma1_008).dma_0x8.dma_cur_addr << 2;
 162                 u32 cur_pos = cur_addr - fc_pci->dma[0].dma_addr0;
 163
 164                 deb_irq("%u irq: %08x cur_addr: %llx: cur_pos: %08x, last_cur_pos: %08x ",
 165                                 jiffies_to_usecs(jiffies - fc_pci->last_irq),
 166                                 v.raw, (unsigned long long)cur_addr, cur_pos,
 167                                 fc_pci->last_dma1_cur_pos);
 168                 fc_pci->last_irq = jiffies;
 169
 170                 /* buffer end was reached, restarted from the beginning
 171                  * pass the data from last_cur_pos to the buffer end to the demux
 172                  */
 173                 if (cur_pos < fc_pci->last_dma1_cur_pos) {
 174                         deb_irq(" end was reached: passing %d bytes ",(fc_pci->dma[0].size*2 - 1) - fc_pci->last_dma1_cur_pos);
 175                         flexcop_pass_dmx_data(fc_pci->fc_dev,
 176                                         fc_pci->dma[0].cpu_addr0 + fc_pci->last_dma1_cur_pos,
 177                                         (fc_pci->dma[0].size*2) - fc_pci->last_dma1_cur_pos);
 178                         fc_pci->last_dma1_cur_pos = 0;
 179                 }
 180
 181                 if (cur_pos > fc_pci->last_dma1_cur_pos) {
 182                         deb_irq(" passing %d bytes ",cur_pos - fc_pci->last_dma1_cur_pos);
 183                         flexcop_pass_dmx_data(fc_pci->fc_dev,
 184                                         fc_pci->dma[0].cpu_addr0 + fc_pci->last_dma1_cur_pos,
 185                                         cur_pos - fc_pci->last_dma1_cur_pos);
 186                 }
 187                 deb_irq("\n");
 188
 189                 fc_pci->last_dma1_cur_pos = cur_pos;
 190                 fc_pci->count++;
 191         } else {
 192                 deb_irq("isr for flexcop called, apparently without reason (%08x)\n",v.raw);
 193                 ret = IRQ_NONE;
 194         }
 195
 196         spin_unlock_irq(&fc_pci->irq_lock);
 197
 198         return ret;
 199 }
 200
 201 static int flexcop_pci_stream_control(struct flexcop_device *fc, int onoff)
 202 {
 203         struct flexcop_pci *fc_pci = fc->bus_specific;
 204         if (onoff) {
 205                 flexcop_dma_config(fc,&fc_pci->dma[0],FC_DMA_1);
 206                 flexcop_dma_config(fc,&fc_pci->dma[1],FC_DMA_2);
 207
 208                 flexcop_dma_config_timer(fc,FC_DMA_1,0);
 209
 210                 flexcop_dma_xfer_control(fc,FC_DMA_1,FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1,1);
 211                 deb_irq("DMA xfer enabled\n");
 212
 213                 fc_pci->last_dma1_cur_pos = 0;
 214                 flexcop_dma_control_timer_irq(fc,FC_DMA_1,1);
 215                 deb_irq("IRQ enabled\n");
 216
 217 //              fc_pci->active_dma1_addr = 0;
 218 //              flexcop_dma_control_size_irq(fc,FC_DMA_1,1);
 219
 220                 if (irq_chk_intv > 0)
 221                         schedule_delayed_work(&fc_pci->irq_check_work,
 222                                         msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));
 223         } else {
 224                 if (irq_chk_intv > 0)
 225                         cancel_delayed_work(&fc_pci->irq_check_work);
 226
 227                 flexcop_dma_control_timer_irq(fc,FC_DMA_1,0);
 228                 deb_irq("IRQ disabled\n");
 229
 230 //              flexcop_dma_control_size_irq(fc,FC_DMA_1,0);
 231
 232                 flexcop_dma_xfer_control(fc,FC_DMA_1,FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1,0);
 233                 deb_irq("DMA xfer disabled\n");
 234         }
 235
 236         return 0;
 237 }
 238
 239 static int flexcop_pci_dma_init(struct flexcop_pci *fc_pci)
 240 {
 241         int ret;
 242         if ((ret = flexcop_dma_allocate(fc_pci->pdev,&fc_pci->dma[0],FC_DEFAULT_DMA1_BUFSIZE)) != 0)
 243                 return ret;
 244
 245         if ((ret = flexcop_dma_allocate(fc_pci->pdev,&fc_pci->dma[1],FC_DEFAULT_DMA2_BUFSIZE)) != 0)
 246                 goto dma1_free;
 247
 248         flexcop_sram_set_dest(fc_pci->fc_dev,FC_SRAM_DEST_MEDIA | FC_SRAM_DEST_NET, FC_SRAM_DEST_TARGET_DMA1);
 249         flexcop_sram_set_dest(fc_pci->fc_dev,FC_SRAM_DEST_CAO   | FC_SRAM_DEST_CAI, FC_SRAM_DEST_TARGET_DMA2);
 250
 251         fc_pci->init_state |= FC_PCI_DMA_INIT;
 252
 253         goto success;
 254 dma1_free:
 255         flexcop_dma_free(&fc_pci->dma[0]);
 256
 257 success:
 258         return ret;
 259 }
 260
 261 static void flexcop_pci_dma_exit(struct flexcop_pci *fc_pci)
 262 {
 263         if (fc_pci->init_state & FC_PCI_DMA_INIT) {
 264                 flexcop_dma_free(&fc_pci->dma[0]);
 265                 flexcop_dma_free(&fc_pci->dma[1]);
 266         }
 267         fc_pci->init_state &= ~FC_PCI_DMA_INIT;
 268 }
 269
 270 static int flexcop_pci_init(struct flexcop_pci *fc_pci)
 271 {
 272         int ret;
 273         u8 card_rev;
 274
 275         pci_read_config_byte(fc_pci->pdev, PCI_CLASS_REVISION, &card_rev);
 276         info("card revision %x", card_rev);
 277
 278         if ((ret = pci_enable_device(fc_pci->pdev)) != 0)
 279                 return ret;
 280
 281         pci_set_master(fc_pci->pdev);
 282
 283         /* enable interrupts */
 284         // pci_write_config_dword(pdev, 0x6c, 0x8000);
 285
 286         if ((ret = pci_request_regions(fc_pci->pdev, DRIVER_NAME)) != 0)
 287                 goto err_pci_disable_device;
 288
 289         fc_pci->io_mem = pci_iomap(fc_pci->pdev, 0, 0x800);
 290
 291         if (!fc_pci->io_mem) {
 292                 err("cannot map io memory\n");
 293                 ret = -EIO;
 294                 goto err_pci_release_regions;
 295         }
 296
 297         pci_set_drvdata(fc_pci->pdev, fc_pci);
 298
 299         if ((ret = request_irq(fc_pci->pdev->irq, flexcop_pci_isr,
 300                                         SA_SHIRQ, DRIVER_NAME, fc_pci)) != 0)
 301                 goto err_pci_iounmap;
 302
 303         spin_lock_init(&fc_pci->irq_lock);
 304
 305         fc_pci->init_state |= FC_PCI_INIT;
 306         goto success;
 307
 308 err_pci_iounmap:
 309         pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
 310         pci_set_drvdata(fc_pci->pdev, NULL);
 311 err_pci_release_regions:
 312         pci_release_regions(fc_pci->pdev);
 313 err_pci_disable_device:
 314         pci_disable_device(fc_pci->pdev);
 315
 316 success:
 317         return ret;
 318 }
 319
 320 static void flexcop_pci_exit(struct flexcop_pci *fc_pci)
 321 {
 322         if (fc_pci->init_state & FC_PCI_INIT) {
 323                 free_irq(fc_pci->pdev->irq, fc_pci);
 324                 pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
 325                 pci_set_drvdata(fc_pci->pdev, NULL);
 326                 pci_release_regions(fc_pci->pdev);
 327                 pci_disable_device(fc_pci->pdev);
 328         }
 329         fc_pci->init_state &= ~FC_PCI_INIT;
 330 }
 331
 332
 333 static int flexcop_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 334 {
 335         struct flexcop_device *fc;
 336         struct flexcop_pci *fc_pci;
 337         int ret = -ENOMEM;
 338
 339         if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_pci))) == NULL) {
 340                 err("out of memory\n");
 341                 return -ENOMEM;
 342         }
 343
 344 /* general flexcop init */
 345         fc_pci = fc->bus_specific;
 346         fc_pci->fc_dev = fc;
 347
 348         fc->read_ibi_reg = flexcop_pci_read_ibi_reg;
 349         fc->write_ibi_reg = flexcop_pci_write_ibi_reg;
 350         fc->i2c_request = flexcop_i2c_request;
 351         fc->get_mac_addr = flexcop_eeprom_check_mac_addr;
 352
 353         fc->stream_control = flexcop_pci_stream_control;
 354
 355         if (enable_pid_filtering)
 356                 info("will use the HW PID filter.");
 357         else
 358                 info("will pass the complete TS to the demuxer.");
 359
 360         fc->pid_filtering = enable_pid_filtering;
 361         fc->bus_type = FC_PCI;
 362
 363         fc->dev = &pdev->dev;
 364         fc->owner = THIS_MODULE;
 365
 366 /* bus specific part */
 367         fc_pci->pdev = pdev;
 368         if ((ret = flexcop_pci_init(fc_pci)) != 0)
 369                 goto err_kfree;
 370
 371 /* init flexcop */
 372         if ((ret = flexcop_device_initialize(fc)) != 0)
 373                 goto err_pci_exit;
 374
 375 /* init dma */
 376         if ((ret = flexcop_pci_dma_init(fc_pci)) != 0)
 377                 goto err_fc_exit;
 378
 379         INIT_WORK(&fc_pci->irq_check_work, flexcop_pci_irq_check_work, fc_pci);
 380
 381         goto success;
 382 err_fc_exit:
 383         flexcop_device_exit(fc);
 384 err_pci_exit:
 385         flexcop_pci_exit(fc_pci);
 386 err_kfree:
 387         flexcop_device_kfree(fc);
 388 success:
 389         return ret;
 390 }
 391
 392 /* in theory every _exit function should be called exactly two times,
 393  * here and in the bail-out-part of the _init-function
 394  */
 395 static void flexcop_pci_remove(struct pci_dev *pdev)
 396 {
 397         struct flexcop_pci *fc_pci = pci_get_drvdata(pdev);
 398
 399         flexcop_pci_dma_exit(fc_pci);
 400         flexcop_device_exit(fc_pci->fc_dev);
 401         flexcop_pci_exit(fc_pci);
 402         flexcop_device_kfree(fc_pci->fc_dev);
 403 }
 404
 405 static struct pci_device_id flexcop_pci_tbl[] = {
 406         { PCI_DEVICE(0x13d0, 0x2103) },
 407 /*      { PCI_DEVICE(0x13d0, 0x2200) }, ? */
 408         { },
 409 };
 410
 411 MODULE_DEVICE_TABLE(pci, flexcop_pci_tbl);
 412
 413 static struct pci_driver flexcop_pci_driver = {
 414         .name     = "b2c2_flexcop_pci",
 415         .id_table = flexcop_pci_tbl,
 416         .probe    = flexcop_pci_probe,
 417         .remove   = flexcop_pci_remove,
 418 };
 419
 420 static int __init flexcop_pci_module_init(void)
 421 {
 422         return pci_register_driver(&flexcop_pci_driver);
 423 }
 424
 425 static void __exit flexcop_pci_module_exit(void)
 426 {
 427         pci_unregister_driver(&flexcop_pci_driver);
 428 }
 429
 430 module_init(flexcop_pci_module_init);
 431 module_exit(flexcop_pci_module_exit);
 432
 433 MODULE_AUTHOR(DRIVER_AUTHOR);
 434 MODULE_DESCRIPTION(DRIVER_NAME);
 435 MODULE_LICENSE("GPL");