linux/drivers/media/pci/b2c2/flexcop-pci.c
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   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
  11static int enable_pid_filtering = 1;
  12module_param(enable_pid_filtering, int, 0444);
  13MODULE_PARM_DESC(enable_pid_filtering,
  14        "enable hardware pid filtering: supported values: 0 (fullts), 1");
  15
  16static int irq_chk_intv = 100;
  17module_param(irq_chk_intv, int, 0644);
  18MODULE_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
  35static int debug;
  36module_param(debug, int, 0644);
  37MODULE_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
  45struct 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
  74static int lastwreg, lastwval, lastrreg, lastrval;
  75
  76static 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
  91static 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
 105static 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 */
 146static 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
 232static 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
 258static 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
 281static 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
 290static 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
 320err_pci_iounmap:
 321        pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
 322err_pci_release_regions:
 323        pci_release_regions(fc_pci->pdev);
 324err_pci_disable_device:
 325        pci_disable_device(fc_pci->pdev);
 326        return ret;
 327}
 328
 329static 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
 340static 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
 394err_fc_exit:
 395        flexcop_device_exit(fc);
 396err_pci_exit:
 397        flexcop_pci_exit(fc_pci);
 398err_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 */
 406static 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
 419static const struct pci_device_id flexcop_pci_tbl[] = {
 420        { PCI_DEVICE(0x13d0, 0x2103) },
 421        { },
 422};
 423
 424MODULE_DEVICE_TABLE(pci, flexcop_pci_tbl);
 425
 426static 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
 433module_pci_driver(flexcop_pci_driver);
 434
 435MODULE_AUTHOR(DRIVER_AUTHOR);
 436MODULE_DESCRIPTION(DRIVER_NAME);
 437MODULE_LICENSE("GPL");
 438