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
 189                 deb_irq("%u irq: %08x cur_addr: %llx: cur_pos: %08x, 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, apparently without reason (%08x)\n",
 224                         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 err_pci_release_regions:
 323         pci_release_regions(fc_pci->pdev);
 324 err_pci_disable_device:
 325         pci_disable_device(fc_pci->pdev);
 326         return ret;
 327 }
 328
 329 static void flexcop_pci_exit(struct flexcop_pci *fc_pci)
 330 {
 331         if (fc_pci->init_state & FC_PCI_INIT) {
 332                 free_irq(fc_pci->pdev->irq, fc_pci);
 333                 pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
 334                 pci_release_regions(fc_pci->pdev);
 335                 pci_disable_device(fc_pci->pdev);
 336         }
 337         fc_pci->init_state &= ~FC_PCI_INIT;
 338 }
 339
 340 static int flexcop_pci_probe(struct pci_dev *pdev,
 341                 const struct pci_device_id *ent)
 342 {
 343         struct flexcop_device *fc;
 344         struct flexcop_pci *fc_pci;
 345         int ret = -ENOMEM;
 346
 347         if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_pci))) == NULL) {
 348                 err("out of memory\n");
 349                 return -ENOMEM;
 350         }
 351
 352         /* general flexcop init */
 353         fc_pci = fc->bus_specific;
 354         fc_pci->fc_dev = fc;
 355
 356         fc->read_ibi_reg = flexcop_pci_read_ibi_reg;
 357         fc->write_ibi_reg = flexcop_pci_write_ibi_reg;
 358         fc->i2c_request = flexcop_i2c_request;
 359         fc->get_mac_addr = flexcop_eeprom_check_mac_addr;
 360         fc->stream_control = flexcop_pci_stream_control;
 361
 362         if (enable_pid_filtering)
 363                 info("will use the HW PID filter.");
 364         else
 365                 info("will pass the complete TS to the demuxer.");
 366
 367         fc->pid_filtering = enable_pid_filtering;
 368         fc->bus_type = FC_PCI;
 369         fc->dev = &pdev->dev;
 370         fc->owner = THIS_MODULE;
 371
 372         /* bus specific part */
 373         fc_pci->pdev = pdev;
 374         if ((ret = flexcop_pci_init(fc_pci)) != 0)
 375                 goto err_kfree;
 376
 377         /* init flexcop */
 378         if ((ret = flexcop_device_initialize(fc)) != 0)
 379                 goto err_pci_exit;
 380
 381         /* init dma */
 382         if ((ret = flexcop_pci_dma_init(fc_pci)) != 0)
 383                 goto err_fc_exit;
 384
 385         INIT_DELAYED_WORK(&fc_pci->irq_check_work, flexcop_pci_irq_check_work);
 386
 387         if (irq_chk_intv > 0)
 388                 schedule_delayed_work(&fc_pci->irq_check_work,
 389                                 msecs_to_jiffies(irq_chk_intv < 100 ?
 390                                         100 :
 391                                         irq_chk_intv));
 392         return ret;
 393
 394 err_fc_exit:
 395         flexcop_device_exit(fc);
 396 err_pci_exit:
 397         flexcop_pci_exit(fc_pci);
 398 err_kfree:
 399         flexcop_device_kfree(fc);
 400         return ret;
 401 }
 402
 403 /* in theory every _exit function should be called exactly two times,
 404  * here and in the bail-out-part of the _init-function
 405  */
 406 static void flexcop_pci_remove(struct pci_dev *pdev)
 407 {
 408         struct flexcop_pci *fc_pci = pci_get_drvdata(pdev);
 409
 410         if (irq_chk_intv > 0)
 411                 cancel_delayed_work(&fc_pci->irq_check_work);
 412
 413         flexcop_pci_dma_exit(fc_pci);
 414         flexcop_device_exit(fc_pci->fc_dev);
 415         flexcop_pci_exit(fc_pci);
 416         flexcop_device_kfree(fc_pci->fc_dev);
 417 }
 418
 419 static const struct pci_device_id flexcop_pci_tbl[] = {
 420         { PCI_DEVICE(0x13d0, 0x2103) },
 421         { },
 422 };
 423
 424 MODULE_DEVICE_TABLE(pci, flexcop_pci_tbl);
 425
 426 static struct pci_driver flexcop_pci_driver = {
 427         .name     = "b2c2_flexcop_pci",
 428         .id_table = flexcop_pci_tbl,
 429         .probe    = flexcop_pci_probe,
 430         .remove   = flexcop_pci_remove,
 431 };
 432
 433 module_pci_driver(flexcop_pci_driver);
 434
 435 MODULE_AUTHOR(DRIVER_AUTHOR);
 436 MODULE_DESCRIPTION(DRIVER_NAME);
 437 MODULE_LICENSE("GPL");