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 #ifdef CONFIG_DVB_B2C2_FLEXCOP_DEBUG
  17 #define dprintk(level,args...) \
  18         do { if ((debug & level)) printk(args); } while (0)
  19 #define DEBSTATUS ""
  20 #else
  21 #define dprintk(level,args...)
  22 #define DEBSTATUS " (debugging is not enabled)"
  23 #endif
  24
  25 #define deb_info(args...)  dprintk(0x01,args)
  26 #define deb_reg(args...)   dprintk(0x02,args)
  27 #define deb_ts(args...)    dprintk(0x04,args)
  28 #define deb_irq(args...)   dprintk(0x08,args)
  29
  30 static int debug = 0;
  31 module_param(debug, int, 0644);
  32 MODULE_PARM_DESC(debug, "set debug level (1=info,2=regs,4=TS,8=irqdma (|-able))." DEBSTATUS);
  33
  34 #define DRIVER_VERSION "0.1"
  35 #define DRIVER_NAME "Technisat/B2C2 FlexCop II/IIb/III Digital TV PCI Driver"
  36 #define DRIVER_AUTHOR "Patrick Boettcher <patrick.boettcher@desy.de>"
  37
  38 struct flexcop_pci {
  39         struct pci_dev *pdev;
  40
  41 #define FC_PCI_INIT     0x01
  42 #define FC_PCI_DMA_INIT 0x02
  43         int init_state;
  44
  45         void __iomem *io_mem;
  46         u32 irq;
  47 /* buffersize (at least for DMA1, need to be % 188 == 0,
  48  * this logic is required */
  49 #define FC_DEFAULT_DMA1_BUFSIZE (1280 * 188)
  50 #define FC_DEFAULT_DMA2_BUFSIZE (10 * 188)
  51         struct flexcop_dma dma[2];
  52
  53         int active_dma1_addr; /* 0 = addr0 of dma1; 1 = addr1 of dma1 */
  54         u32 last_dma1_cur_pos; /* position of the pointer last time the timer/packet irq occured */
  55         int count;
  56
  57         spinlock_t irq_lock;
  58
  59         struct flexcop_device *fc_dev;
  60 };
  61
  62 static int lastwreg,lastwval,lastrreg,lastrval;
  63
  64 static flexcop_ibi_value flexcop_pci_read_ibi_reg (struct flexcop_device *fc, flexcop_ibi_register r)
  65 {
  66         struct flexcop_pci *fc_pci = fc->bus_specific;
  67         flexcop_ibi_value v;
  68         v.raw = readl(fc_pci->io_mem + r);
  69
  70         if (lastrreg != r || lastrval != v.raw) {
  71                 lastrreg = r; lastrval = v.raw;
  72                 deb_reg("new rd: %3x: %08x\n",r,v.raw);
  73         }
  74
  75         return v;
  76 }
  77
  78 static int flexcop_pci_write_ibi_reg(struct flexcop_device *fc, flexcop_ibi_register r, flexcop_ibi_value v)
  79 {
  80         struct flexcop_pci *fc_pci = fc->bus_specific;
  81
  82         if (lastwreg != r || lastwval != v.raw) {
  83                 lastwreg = r; lastwval = v.raw;
  84                 deb_reg("new wr: %3x: %08x\n",r,v.raw);
  85         }
  86
  87         writel(v.raw, fc_pci->io_mem + r);
  88         return 0;
  89 }
  90
  91 /* When PID filtering is turned on, we use the timer IRQ, because small amounts
  92  * of data need to be passed to the user space instantly as well. When PID
  93  * filtering is turned off, we use the page-change-IRQ */
  94 static irqreturn_t flexcop_pci_irq(int irq, void *dev_id, struct pt_regs *regs)
  95 {
  96         struct flexcop_pci *fc_pci = dev_id;
  97         struct flexcop_device *fc = fc_pci->fc_dev;
  98         flexcop_ibi_value v = fc->read_ibi_reg(fc,irq_20c);
  99         irqreturn_t ret = IRQ_HANDLED;
 100
 101         spin_lock_irq(&fc_pci->irq_lock);
 102
 103         if (v.irq_20c.DMA1_IRQ_Status == 1) {
 104                 if (fc_pci->active_dma1_addr == 0)
 105                         flexcop_pass_dmx_packets(fc_pci->fc_dev,fc_pci->dma[0].cpu_addr0,fc_pci->dma[0].size / 188);
 106                 else
 107                         flexcop_pass_dmx_packets(fc_pci->fc_dev,fc_pci->dma[0].cpu_addr1,fc_pci->dma[0].size / 188);
 108
 109                 deb_irq("page change to page: %d\n",!fc_pci->active_dma1_addr);
 110                 fc_pci->active_dma1_addr = !fc_pci->active_dma1_addr;
 111         } else if (v.irq_20c.DMA1_Timer_Status == 1) {
 112                 /* for the timer IRQ we only can use buffer dmx feeding, because we don't have
 113                  * complete TS packets when reading from the DMA memory */
 114                 dma_addr_t cur_addr =
 115                         fc->read_ibi_reg(fc,dma1_008).dma_0x8.dma_cur_addr << 2;
 116                 u32 cur_pos = cur_addr - fc_pci->dma[0].dma_addr0;
 117
 118                 deb_irq("irq: %08x cur_addr: %08x: cur_pos: %08x, last_cur_pos: %08x ",
 119                                 v.raw,cur_addr,cur_pos,fc_pci->last_dma1_cur_pos);
 120
 121                 /* buffer end was reached, restarted from the beginning
 122                  * pass the data from last_cur_pos to the buffer end to the demux
 123                  */
 124                 if (cur_pos < fc_pci->last_dma1_cur_pos) {
 125                         deb_irq(" end was reached: passing %d bytes ",(fc_pci->dma[0].size*2 - 1) - fc_pci->last_dma1_cur_pos);
 126                         flexcop_pass_dmx_data(fc_pci->fc_dev,
 127                                         fc_pci->dma[0].cpu_addr0 + fc_pci->last_dma1_cur_pos,
 128                                         (fc_pci->dma[0].size*2) - fc_pci->last_dma1_cur_pos);
 129                         fc_pci->last_dma1_cur_pos = 0;
 130                         fc_pci->count = 0;
 131                 }
 132
 133                 if (cur_pos > fc_pci->last_dma1_cur_pos) {
 134                         deb_irq(" passing %d bytes ",cur_pos - fc_pci->last_dma1_cur_pos);
 135                         flexcop_pass_dmx_data(fc_pci->fc_dev,
 136                                         fc_pci->dma[0].cpu_addr0 + fc_pci->last_dma1_cur_pos,
 137                                         cur_pos - fc_pci->last_dma1_cur_pos);
 138                 }
 139                 deb_irq("\n");
 140
 141                 fc_pci->last_dma1_cur_pos = cur_pos;
 142         } else
 143                 ret = IRQ_NONE;
 144
 145         spin_unlock_irq(&fc_pci->irq_lock);
 146
 147 /* packet count would be ideal for hw filtering, but it isn't working. Either
 148  * the data book is wrong, or I'm unable to read it correctly */
 149
 150 /*      if (v.irq_20c.DMA1_Size_IRQ_Status == 1) { packet counter */
 151
 152         return ret;
 153 }
 154
 155 static int flexcop_pci_stream_control(struct flexcop_device *fc, int onoff)
 156 {
 157         struct flexcop_pci *fc_pci = fc->bus_specific;
 158         if (onoff) {
 159                 flexcop_dma_config(fc,&fc_pci->dma[0],FC_DMA_1,FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1);
 160                 flexcop_dma_config(fc,&fc_pci->dma[1],FC_DMA_2,FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1);
 161                 flexcop_dma_config_timer(fc,FC_DMA_1,1);
 162
 163                 if (fc_pci->fc_dev->pid_filtering) {
 164                         fc_pci->last_dma1_cur_pos = 0;
 165                         flexcop_dma_control_timer_irq(fc,FC_DMA_1,1);
 166                 } else {
 167                         fc_pci->active_dma1_addr = 0;
 168                         flexcop_dma_control_size_irq(fc,FC_DMA_1,1);
 169                 }
 170
 171 /*              flexcop_dma_config_packet_count(fc,FC_DMA_1,0xc0);
 172                 flexcop_dma_control_packet_irq(fc,FC_DMA_1,1); */
 173
 174                 deb_irq("irqs enabled\n");
 175         } else {
 176                 if (fc_pci->fc_dev->pid_filtering)
 177                         flexcop_dma_control_timer_irq(fc,FC_DMA_1,0);
 178                 else
 179                         flexcop_dma_control_size_irq(fc,FC_DMA_1,0);
 180
 181 //              flexcop_dma_control_packet_irq(fc,FC_DMA_1,0);
 182                 deb_irq("irqs disabled\n");
 183         }
 184
 185         return 0;
 186 }
 187
 188 static int flexcop_pci_dma_init(struct flexcop_pci *fc_pci)
 189 {
 190         int ret;
 191         if ((ret = flexcop_dma_allocate(fc_pci->pdev,&fc_pci->dma[0],FC_DEFAULT_DMA1_BUFSIZE)) != 0)
 192                 return ret;
 193
 194         if ((ret = flexcop_dma_allocate(fc_pci->pdev,&fc_pci->dma[1],FC_DEFAULT_DMA2_BUFSIZE)) != 0)
 195                 goto dma1_free;
 196
 197         flexcop_sram_set_dest(fc_pci->fc_dev,FC_SRAM_DEST_MEDIA | FC_SRAM_DEST_NET, FC_SRAM_DEST_TARGET_DMA1);
 198         flexcop_sram_set_dest(fc_pci->fc_dev,FC_SRAM_DEST_CAO   | FC_SRAM_DEST_CAI, FC_SRAM_DEST_TARGET_DMA2);
 199
 200         fc_pci->init_state |= FC_PCI_DMA_INIT;
 201         goto success;
 202 dma1_free:
 203         flexcop_dma_free(&fc_pci->dma[0]);
 204
 205 success:
 206         return ret;
 207 }
 208
 209 static void flexcop_pci_dma_exit(struct flexcop_pci *fc_pci)
 210 {
 211         if (fc_pci->init_state & FC_PCI_DMA_INIT) {
 212                 flexcop_dma_free(&fc_pci->dma[0]);
 213                 flexcop_dma_free(&fc_pci->dma[1]);
 214         }
 215         fc_pci->init_state &= ~FC_PCI_DMA_INIT;
 216 }
 217
 218 static int flexcop_pci_init(struct flexcop_pci *fc_pci)
 219 {
 220         int ret;
 221         u8 card_rev;
 222
 223         pci_read_config_byte(fc_pci->pdev, PCI_CLASS_REVISION, &card_rev);
 224         info("card revision %x", card_rev);
 225
 226         if ((ret = pci_enable_device(fc_pci->pdev)) != 0)
 227                 return ret;
 228
 229         pci_set_master(fc_pci->pdev);
 230
 231         /* enable interrupts */
 232         // pci_write_config_dword(pdev, 0x6c, 0x8000);
 233
 234         if ((ret = pci_request_regions(fc_pci->pdev, DRIVER_NAME)) != 0)
 235                 goto err_pci_disable_device;
 236
 237         fc_pci->io_mem = pci_iomap(fc_pci->pdev, 0, 0x800);
 238
 239         if (!fc_pci->io_mem) {
 240                 err("cannot map io memory\n");
 241                 ret = -EIO;
 242                 goto err_pci_release_regions;
 243         }
 244
 245         pci_set_drvdata(fc_pci->pdev, fc_pci);
 246
 247         if ((ret = request_irq(fc_pci->pdev->irq, flexcop_pci_irq,
 248                                         SA_SHIRQ, DRIVER_NAME, fc_pci)) != 0)
 249                 goto err_pci_iounmap;
 250
 251         spin_lock_init(&fc_pci->irq_lock);
 252
 253         fc_pci->init_state |= FC_PCI_INIT;
 254         goto success;
 255
 256 err_pci_iounmap:
 257         pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
 258         pci_set_drvdata(fc_pci->pdev, NULL);
 259 err_pci_release_regions:
 260         pci_release_regions(fc_pci->pdev);
 261 err_pci_disable_device:
 262         pci_disable_device(fc_pci->pdev);
 263
 264 success:
 265         return ret;
 266 }
 267
 268 static void flexcop_pci_exit(struct flexcop_pci *fc_pci)
 269 {
 270         if (fc_pci->init_state & FC_PCI_INIT) {
 271                 free_irq(fc_pci->pdev->irq, fc_pci);
 272                 pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
 273                 pci_set_drvdata(fc_pci->pdev, NULL);
 274                 pci_release_regions(fc_pci->pdev);
 275                 pci_disable_device(fc_pci->pdev);
 276         }
 277         fc_pci->init_state &= ~FC_PCI_INIT;
 278 }
 279
 280
 281 static int flexcop_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 282 {
 283         struct flexcop_device *fc;
 284         struct flexcop_pci *fc_pci;
 285         int ret = -ENOMEM;
 286
 287         if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_pci))) == NULL) {
 288                 err("out of memory\n");
 289                 return -ENOMEM;
 290         }
 291
 292 /* general flexcop init */
 293         fc_pci = fc->bus_specific;
 294         fc_pci->fc_dev = fc;
 295
 296         fc->read_ibi_reg = flexcop_pci_read_ibi_reg;
 297         fc->write_ibi_reg = flexcop_pci_write_ibi_reg;
 298         fc->i2c_request = flexcop_i2c_request;
 299         fc->get_mac_addr = flexcop_eeprom_check_mac_addr;
 300
 301         fc->stream_control = flexcop_pci_stream_control;
 302
 303         if (enable_pid_filtering)
 304                 info("will use the HW PID filter.");
 305         else
 306                 info("will pass the complete TS to the demuxer.");
 307
 308         fc->pid_filtering = enable_pid_filtering;
 309         fc->bus_type = FC_PCI;
 310
 311         fc->dev = &pdev->dev;
 312         fc->owner = THIS_MODULE;
 313
 314 /* bus specific part */
 315         fc_pci->pdev = pdev;
 316         if ((ret = flexcop_pci_init(fc_pci)) != 0)
 317                 goto err_kfree;
 318
 319 /* init flexcop */
 320         if ((ret = flexcop_device_initialize(fc)) != 0)
 321                 goto err_pci_exit;
 322
 323 /* init dma */
 324         if ((ret = flexcop_pci_dma_init(fc_pci)) != 0)
 325                 goto err_fc_exit;
 326
 327         goto success;
 328 err_fc_exit:
 329         flexcop_device_exit(fc);
 330 err_pci_exit:
 331         flexcop_pci_exit(fc_pci);
 332 err_kfree:
 333         flexcop_device_kfree(fc);
 334 success:
 335         return ret;
 336 }
 337
 338 /* in theory every _exit function should be called exactly two times,
 339  * here and in the bail-out-part of the _init-function
 340  */
 341 static void flexcop_pci_remove(struct pci_dev *pdev)
 342 {
 343         struct flexcop_pci *fc_pci = pci_get_drvdata(pdev);
 344
 345         flexcop_pci_dma_exit(fc_pci);
 346         flexcop_device_exit(fc_pci->fc_dev);
 347         flexcop_pci_exit(fc_pci);
 348         flexcop_device_kfree(fc_pci->fc_dev);
 349 }
 350
 351 static struct pci_device_id flexcop_pci_tbl[] = {
 352         { PCI_DEVICE(0x13d0, 0x2103) },
 353 /*      { PCI_DEVICE(0x13d0, 0x2200) }, PCI FlexCopIII ? */
 354         { },
 355 };
 356
 357 MODULE_DEVICE_TABLE(pci, flexcop_pci_tbl);
 358
 359 static struct pci_driver flexcop_pci_driver = {
 360         .name = "Technisat/B2C2 FlexCop II/IIb/III PCI",
 361         .id_table = flexcop_pci_tbl,
 362         .probe = flexcop_pci_probe,
 363         .remove = flexcop_pci_remove,
 364 };
 365
 366 static int __init flexcop_pci_module_init(void)
 367 {
 368         return pci_register_driver(&flexcop_pci_driver);
 369 }
 370
 371 static void __exit flexcop_pci_module_exit(void)
 372 {
 373         pci_unregister_driver(&flexcop_pci_driver);
 374 }
 375
 376 module_init(flexcop_pci_module_init);
 377 module_exit(flexcop_pci_module_exit);
 378
 379 MODULE_AUTHOR(DRIVER_AUTHOR);
 380 MODULE_DESCRIPTION(DRIVER_NAME);
 381 MODULE_LICENSE("GPL");