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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Linux driver the digital TV devices equipped with B2C2 FlexcopII(b)/III
   4  * flexcop-pci.c - covers the PCI part including DMA transfers
   5  * see flexcop.c for copyright information
   6  */
   7
   8 #define FC_LOG_PREFIX "flexcop-pci"
   9 #include "flexcop-common.h"
  10
  11 static int enable_pid_filtering = 1;
  12 module_param(enable_pid_filtering, int, 0444);
  13 MODULE_PARM_DESC(enable_pid_filtering,
  14         "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 "flexcop-pci"
  43 #define DRIVER_AUTHOR "Patrick Boettcher <patrick.boettcher@posteo.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;
  62         /* position of the pointer last time the timer/packet irq occurred */
  63         int count;
  64         int count_prev;
  65         int stream_problem;
  66
  67         spinlock_t irq_lock;
  68         unsigned long last_irq;
  69
  70         struct delayed_work irq_check_work;
  71         struct flexcop_device *fc_dev;
  72 };
  73
  74 static int lastwreg, lastwval, lastrreg, lastrval;
  75
  76 static flexcop_ibi_value flexcop_pci_read_ibi_reg(struct flexcop_device *fc,
  77                 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,
  92                 flexcop_ibi_register r, flexcop_ibi_value v)
  93 {
  94         struct flexcop_pci *fc_pci = fc->bus_specific;
  95
  96         if (lastwreg != r || lastwval != v.raw) {
  97                 lastwreg = r; lastwval = v.raw;
  98                 deb_reg("new wr: %3x: %08x\n", r, v.raw);
  99         }
 100
 101         writel(v.raw, fc_pci->io_mem + r);
 102         return 0;
 103 }
 104
 105 static void flexcop_pci_irq_check_work(struct work_struct *work)
 106 {
 107         struct flexcop_pci *fc_pci =
 108                 container_of(work, struct flexcop_pci, irq_check_work.work);
 109         struct flexcop_device *fc = fc_pci->fc_dev;
 110
 111         if (fc->feedcount) {
 112
 113                 if (fc_pci->count == fc_pci->count_prev) {
 114                         deb_chk("no IRQ since the last check\n");
 115                         if (fc_pci->stream_problem++ == 3) {
 116                                 struct dvb_demux_feed *feed;
 117                                 deb_info("flexcop-pci: stream problem, resetting pid filter\n");
 118
 119                                 spin_lock_irq(&fc->demux.lock);
 120                                 list_for_each_entry(feed, &fc->demux.feed_list,
 121                                                 list_head) {
 122                                         flexcop_pid_feed_control(fc, feed, 0);
 123                                 }
 124
 125                                 list_for_each_entry(feed, &fc->demux.feed_list,
 126                                                 list_head) {
 127                                         flexcop_pid_feed_control(fc, feed, 1);
 128                                 }
 129                                 spin_unlock_irq(&fc->demux.lock);
 130
 131                                 fc_pci->stream_problem = 0;
 132                         }
 133                 } else {
 134                         fc_pci->stream_problem = 0;
 135                         fc_pci->count_prev = fc_pci->count;
 136                 }
 137         }
 138
 139         schedule_delayed_work(&fc_pci->irq_check_work,
 140                         msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));
 141 }
 142
 143 /* When PID filtering is turned on, we use the timer IRQ, because small amounts
 144  * of data need to be passed to the user space instantly as well. When PID
 145  * filtering is turned off, we use the page-change-IRQ */
 146 static irqreturn_t flexcop_pci_isr(int irq, void *dev_id)
 147 {
 148         struct flexcop_pci *fc_pci = dev_id;
 149         struct flexcop_device *fc = fc_pci->fc_dev;
 150         unsigned long flags;
 151         flexcop_ibi_value v;
 152         irqreturn_t ret = IRQ_HANDLED;
 153
 154         spin_lock_irqsave(&fc_pci->irq_lock, flags);
 155         v = fc->read_ibi_reg(fc, irq_20c);
 156
 157         /* errors */
 158         if (v.irq_20c.Data_receiver_error)
 159                 deb_chk("data receiver error\n");
 160         if (v.irq_20c.Continuity_error_flag)
 161                 deb_chk("Continuity error flag is set\n");
 162         if (v.irq_20c.LLC_SNAP_FLAG_set)
 163                 deb_chk("LLC_SNAP_FLAG_set is set\n");
 164         if (v.irq_20c.Transport_Error)
 165                 deb_chk("Transport error\n");
 166
 167         if ((fc_pci->count % 1000) == 0)
 168                 deb_chk("%d valid irq took place so far\n", fc_pci->count);
 169
 170         if (v.irq_20c.DMA1_IRQ_Status == 1) {
 171                 if (fc_pci->active_dma1_addr == 0)
 172                         flexcop_pass_dmx_packets(fc_pci->fc_dev,
 173                                         fc_pci->dma[0].cpu_addr0,
 174                                         fc_pci->dma[0].size / 188);
 175                 else
 176                         flexcop_pass_dmx_packets(fc_pci->fc_dev,
 177                                         fc_pci->dma[0].cpu_addr1,
 178                                         fc_pci->dma[0].size / 188);
 179
 180                 deb_irq("page change to page: %d\n",!fc_pci->active_dma1_addr);
 181                 fc_pci->active_dma1_addr = !fc_pci->active_dma1_addr;
 182                 /* for the timer IRQ we only can use buffer dmx feeding, because we don't have
 183                  * complete TS packets when reading from the DMA memory */
 184         } else if (v.irq_20c.DMA1_Timer_Status == 1) {
 185                 dma_addr_t cur_addr =
 186                         fc->read_ibi_reg(fc,dma1_008).dma_0x8.dma_cur_addr << 2;
 187                 u32 cur_pos = cur_addr - fc_pci->dma[0].dma_addr0;
 188                 if (cur_pos > fc_pci->dma[0].size * 2)
 189                         goto error;
 190
 191                 deb_irq("%u irq: %08x cur_addr: %llx: cur_pos: %08x, last_cur_pos: %08x ",
 192                                 jiffies_to_usecs(jiffies - fc_pci->last_irq),
 193                                 v.raw, (unsigned long long)cur_addr, cur_pos,
 194                                 fc_pci->last_dma1_cur_pos);
 195                 fc_pci->last_irq = jiffies;
 196
 197                 /* buffer end was reached, restarted from the beginning
 198                  * pass the data from last_cur_pos to the buffer end to the demux
 199                  */
 200                 if (cur_pos < fc_pci->last_dma1_cur_pos) {
 201                         deb_irq(" end was reached: passing %d bytes ",
 202                                 (fc_pci->dma[0].size*2 - 1) -
 203                                 fc_pci->last_dma1_cur_pos);
 204                         flexcop_pass_dmx_data(fc_pci->fc_dev,
 205                                 fc_pci->dma[0].cpu_addr0 +
 206                                         fc_pci->last_dma1_cur_pos,
 207                                 (fc_pci->dma[0].size*2) -
 208                                         fc_pci->last_dma1_cur_pos);
 209                         fc_pci->last_dma1_cur_pos = 0;
 210                 }
 211
 212                 if (cur_pos > fc_pci->last_dma1_cur_pos) {
 213                         deb_irq(" passing %d bytes ",
 214                                 cur_pos - fc_pci->last_dma1_cur_pos);
 215                         flexcop_pass_dmx_data(fc_pci->fc_dev,
 216                                 fc_pci->dma[0].cpu_addr0 +
 217                                         fc_pci->last_dma1_cur_pos,
 218                                 cur_pos - fc_pci->last_dma1_cur_pos);
 219                 }
 220                 deb_irq("\n");
 221
 222                 fc_pci->last_dma1_cur_pos = cur_pos;
 223                 fc_pci->count++;
 224         } else {
 225                 deb_irq("isr for flexcop called, apparently without reason (%08x)\n",
 226                         v.raw);
 227                 ret = IRQ_NONE;
 228         }
 229
 230 error:
 231         spin_unlock_irqrestore(&fc_pci->irq_lock, flags);
 232         return ret;
 233 }
 234
 235 static int flexcop_pci_stream_control(struct flexcop_device *fc, int onoff)
 236 {
 237         struct flexcop_pci *fc_pci = fc->bus_specific;
 238         if (onoff) {
 239                 flexcop_dma_config(fc, &fc_pci->dma[0], FC_DMA_1);
 240                 flexcop_dma_config(fc, &fc_pci->dma[1], FC_DMA_2);
 241                 flexcop_dma_config_timer(fc, FC_DMA_1, 0);
 242                 flexcop_dma_xfer_control(fc, FC_DMA_1,
 243                                 FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1, 1);
 244                 deb_irq("DMA xfer enabled\n");
 245
 246                 fc_pci->last_dma1_cur_pos = 0;
 247                 flexcop_dma_control_timer_irq(fc, FC_DMA_1, 1);
 248                 deb_irq("IRQ enabled\n");
 249                 fc_pci->count_prev = fc_pci->count;
 250         } else {
 251                 flexcop_dma_control_timer_irq(fc, FC_DMA_1, 0);
 252                 deb_irq("IRQ disabled\n");
 253
 254                 flexcop_dma_xfer_control(fc, FC_DMA_1,
 255                          FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1, 0);
 256                 deb_irq("DMA xfer disabled\n");
 257         }
 258         return 0;
 259 }
 260
 261 static int flexcop_pci_dma_init(struct flexcop_pci *fc_pci)
 262 {
 263         int ret;
 264         ret = flexcop_dma_allocate(fc_pci->pdev, &fc_pci->dma[0],
 265                         FC_DEFAULT_DMA1_BUFSIZE);
 266         if (ret != 0)
 267                 return ret;
 268
 269         ret = flexcop_dma_allocate(fc_pci->pdev, &fc_pci->dma[1],
 270                         FC_DEFAULT_DMA2_BUFSIZE);
 271         if (ret != 0) {
 272                 flexcop_dma_free(&fc_pci->dma[0]);
 273                 return ret;
 274         }
 275
 276         flexcop_sram_set_dest(fc_pci->fc_dev, FC_SRAM_DEST_MEDIA |
 277                         FC_SRAM_DEST_NET, FC_SRAM_DEST_TARGET_DMA1);
 278         flexcop_sram_set_dest(fc_pci->fc_dev, FC_SRAM_DEST_CAO |
 279                         FC_SRAM_DEST_CAI, FC_SRAM_DEST_TARGET_DMA2);
 280         fc_pci->init_state |= FC_PCI_DMA_INIT;
 281         return ret;
 282 }
 283
 284 static void flexcop_pci_dma_exit(struct flexcop_pci *fc_pci)
 285 {
 286         if (fc_pci->init_state & FC_PCI_DMA_INIT) {
 287                 flexcop_dma_free(&fc_pci->dma[0]);
 288                 flexcop_dma_free(&fc_pci->dma[1]);
 289         }
 290         fc_pci->init_state &= ~FC_PCI_DMA_INIT;
 291 }
 292
 293 static int flexcop_pci_init(struct flexcop_pci *fc_pci)
 294 {
 295         int ret;
 296
 297         info("card revision %x", fc_pci->pdev->revision);
 298
 299         if ((ret = pci_enable_device(fc_pci->pdev)) != 0)
 300                 return ret;
 301         pci_set_master(fc_pci->pdev);
 302
 303         if ((ret = pci_request_regions(fc_pci->pdev, DRIVER_NAME)) != 0)
 304                 goto err_pci_disable_device;
 305
 306         fc_pci->io_mem = pci_iomap(fc_pci->pdev, 0, 0x800);
 307
 308         if (!fc_pci->io_mem) {
 309                 err("cannot map io memory\n");
 310                 ret = -EIO;
 311                 goto err_pci_release_regions;
 312         }
 313
 314         pci_set_drvdata(fc_pci->pdev, fc_pci);
 315         spin_lock_init(&fc_pci->irq_lock);
 316         if ((ret = request_irq(fc_pci->pdev->irq, flexcop_pci_isr,
 317                                         IRQF_SHARED, DRIVER_NAME, fc_pci)) != 0)
 318                 goto err_pci_iounmap;
 319
 320         fc_pci->init_state |= FC_PCI_INIT;
 321         return ret;
 322
 323 err_pci_iounmap:
 324         pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
 325 err_pci_release_regions:
 326         pci_release_regions(fc_pci->pdev);
 327 err_pci_disable_device:
 328         pci_disable_device(fc_pci->pdev);
 329         return ret;
 330 }
 331
 332 static void flexcop_pci_exit(struct flexcop_pci *fc_pci)
 333 {
 334         if (fc_pci->init_state & FC_PCI_INIT) {
 335                 free_irq(fc_pci->pdev->irq, fc_pci);
 336                 pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
 337                 pci_release_regions(fc_pci->pdev);
 338                 pci_disable_device(fc_pci->pdev);
 339         }
 340         fc_pci->init_state &= ~FC_PCI_INIT;
 341 }
 342
 343 static int flexcop_pci_probe(struct pci_dev *pdev,
 344                 const struct pci_device_id *ent)
 345 {
 346         struct flexcop_device *fc;
 347         struct flexcop_pci *fc_pci;
 348         int ret = -ENOMEM;
 349
 350         if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_pci))) == NULL) {
 351                 err("out of memory\n");
 352                 return -ENOMEM;
 353         }
 354
 355         /* general flexcop init */
 356         fc_pci = fc->bus_specific;
 357         fc_pci->fc_dev = fc;
 358
 359         fc->read_ibi_reg = flexcop_pci_read_ibi_reg;
 360         fc->write_ibi_reg = flexcop_pci_write_ibi_reg;
 361         fc->i2c_request = flexcop_i2c_request;
 362         fc->get_mac_addr = flexcop_eeprom_check_mac_addr;
 363         fc->stream_control = flexcop_pci_stream_control;
 364
 365         if (enable_pid_filtering)
 366                 info("will use the HW PID filter.");
 367         else
 368                 info("will pass the complete TS to the demuxer.");
 369
 370         fc->pid_filtering = enable_pid_filtering;
 371         fc->bus_type = FC_PCI;
 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 ?
 393                                         100 :
 394                                         irq_chk_intv));
 395         return ret;
 396
 397 err_fc_exit:
 398         flexcop_device_exit(fc);
 399 err_pci_exit:
 400         flexcop_pci_exit(fc_pci);
 401 err_kfree:
 402         flexcop_device_kfree(fc);
 403         return ret;
 404 }
 405
 406 /* in theory every _exit function should be called exactly two times,
 407  * here and in the bail-out-part of the _init-function
 408  */
 409 static void flexcop_pci_remove(struct pci_dev *pdev)
 410 {
 411         struct flexcop_pci *fc_pci = pci_get_drvdata(pdev);
 412
 413         if (irq_chk_intv > 0)
 414                 cancel_delayed_work(&fc_pci->irq_check_work);
 415
 416         flexcop_pci_dma_exit(fc_pci);
 417         flexcop_device_exit(fc_pci->fc_dev);
 418         flexcop_pci_exit(fc_pci);
 419         flexcop_device_kfree(fc_pci->fc_dev);
 420 }
 421
 422 static const struct pci_device_id flexcop_pci_tbl[] = {
 423         { PCI_DEVICE(0x13d0, 0x2103) },
 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 module_pci_driver(flexcop_pci_driver);
 437
 438 MODULE_AUTHOR(DRIVER_AUTHOR);
 439 MODULE_DESCRIPTION(DRIVER_NAME);
 440 MODULE_LICENSE("GPL");