Linux 2.6.31-rc6
[linux-2.6] / drivers / media / dvb / b2c2 / flexcop-pci.c
1 /*
2  * Linux driver the digital TV devices equipped with B2C2 FlexcopII(b)/III
3  * flexcop-pci.c - covers the PCI part including DMA transfers
4  * see flexcop.c for copyright information
5  */
6
7 #define FC_LOG_PREFIX "flexcop-pci"
8 #include "flexcop-common.h"
9
10 static int enable_pid_filtering = 1;
11 module_param(enable_pid_filtering, int, 0444);
12 MODULE_PARM_DESC(enable_pid_filtering,
13         "enable hardware pid filtering: supported values: 0 (fullts), 1");
14
15 static int irq_chk_intv = 100;
16 module_param(irq_chk_intv, int, 0644);
17 MODULE_PARM_DESC(irq_chk_intv, "set the interval for IRQ streaming watchdog.");
18
19 #ifdef CONFIG_DVB_B2C2_FLEXCOP_DEBUG
20 #define dprintk(level,args...) \
21         do { if ((debug & level)) printk(args); } while (0)
22 #define DEBSTATUS ""
23 #else
24 #define dprintk(level,args...)
25 #define DEBSTATUS " (debugging is not enabled)"
26 #endif
27
28 #define deb_info(args...) dprintk(0x01, args)
29 #define deb_reg(args...) dprintk(0x02, args)
30 #define deb_ts(args...) dprintk(0x04, args)
31 #define deb_irq(args...) dprintk(0x08, args)
32 #define deb_chk(args...) dprintk(0x10, args)
33
34 static int debug;
35 module_param(debug, int, 0644);
36 MODULE_PARM_DESC(debug,
37         "set debug level (1=info,2=regs,4=TS,8=irqdma,16=check (|-able))."
38         DEBSTATUS);
39
40 #define DRIVER_VERSION "0.1"
41 #define DRIVER_NAME "Technisat/B2C2 FlexCop II/IIb/III Digital TV PCI Driver"
42 #define DRIVER_AUTHOR "Patrick Boettcher <patrick.boettcher@desy.de>"
43
44 struct flexcop_pci {
45         struct pci_dev *pdev;
46
47 #define FC_PCI_INIT     0x01
48 #define FC_PCI_DMA_INIT 0x02
49         int init_state;
50
51         void __iomem *io_mem;
52         u32 irq;
53         /* buffersize (at least for DMA1, need to be % 188 == 0,
54          * this logic is required */
55 #define FC_DEFAULT_DMA1_BUFSIZE (1280 * 188)
56 #define FC_DEFAULT_DMA2_BUFSIZE (10 * 188)
57         struct flexcop_dma dma[2];
58
59         int active_dma1_addr; /* 0 = addr0 of dma1; 1 = addr1 of dma1 */
60         u32 last_dma1_cur_pos;
61         /* position of the pointer last time the timer/packet irq occured */
62         int count;
63         int count_prev;
64         int stream_problem;
65
66         spinlock_t irq_lock;
67         unsigned long last_irq;
68
69         struct delayed_work irq_check_work;
70         struct flexcop_device *fc_dev;
71 };
72
73 static int lastwreg, lastwval, lastrreg, lastrval;
74
75 static flexcop_ibi_value flexcop_pci_read_ibi_reg(struct flexcop_device *fc,
76                 flexcop_ibi_register r)
77 {
78         struct flexcop_pci *fc_pci = fc->bus_specific;
79         flexcop_ibi_value v;
80         v.raw = readl(fc_pci->io_mem + r);
81
82         if (lastrreg != r || lastrval != v.raw) {
83                 lastrreg = r; lastrval = v.raw;
84                 deb_reg("new rd: %3x: %08x\n", r, v.raw);
85         }
86
87         return v;
88 }
89
90 static int flexcop_pci_write_ibi_reg(struct flexcop_device *fc,
91                 flexcop_ibi_register r, flexcop_ibi_value v)
92 {
93         struct flexcop_pci *fc_pci = fc->bus_specific;
94
95         if (lastwreg != r || lastwval != v.raw) {
96                 lastwreg = r; lastwval = v.raw;
97                 deb_reg("new wr: %3x: %08x\n", r, v.raw);
98         }
99
100         writel(v.raw, fc_pci->io_mem + r);
101         return 0;
102 }
103
104 static void flexcop_pci_irq_check_work(struct work_struct *work)
105 {
106         struct flexcop_pci *fc_pci =
107                 container_of(work, struct flexcop_pci, irq_check_work.work);
108         struct flexcop_device *fc = fc_pci->fc_dev;
109
110         if (fc->feedcount) {
111
112                 if (fc_pci->count == fc_pci->count_prev) {
113                         deb_chk("no IRQ since the last check\n");
114                         if (fc_pci->stream_problem++ == 3) {
115                                 struct dvb_demux_feed *feed;
116                                 deb_info("flexcop-pci: stream problem, resetting pid filter\n");
117
118                                 spin_lock_irq(&fc->demux.lock);
119                                 list_for_each_entry(feed, &fc->demux.feed_list,
120                                                 list_head) {
121                                         flexcop_pid_feed_control(fc, feed, 0);
122                                 }
123
124                                 list_for_each_entry(feed, &fc->demux.feed_list,
125                                                 list_head) {
126                                         flexcop_pid_feed_control(fc, feed, 1);
127                                 }
128                                 spin_unlock_irq(&fc->demux.lock);
129
130                                 fc_pci->stream_problem = 0;
131                         }
132                 } else {
133                         fc_pci->stream_problem = 0;
134                         fc_pci->count_prev = fc_pci->count;
135                 }
136         }
137
138         schedule_delayed_work(&fc_pci->irq_check_work,
139                         msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));
140 }
141
142 /* When PID filtering is turned on, we use the timer IRQ, because small amounts
143  * of data need to be passed to the user space instantly as well. When PID
144  * filtering is turned off, we use the page-change-IRQ */
145 static irqreturn_t flexcop_pci_isr(int irq, void *dev_id)
146 {
147         struct flexcop_pci *fc_pci = dev_id;
148         struct flexcop_device *fc = fc_pci->fc_dev;
149         unsigned long flags;
150         flexcop_ibi_value v;
151         irqreturn_t ret = IRQ_HANDLED;
152
153         spin_lock_irqsave(&fc_pci->irq_lock, flags);
154         v = fc->read_ibi_reg(fc, irq_20c);
155
156         /* errors */
157         if (v.irq_20c.Data_receiver_error)
158                 deb_chk("data receiver error\n");
159         if (v.irq_20c.Continuity_error_flag)
160                 deb_chk("Contunuity error flag is set\n");
161         if (v.irq_20c.LLC_SNAP_FLAG_set)
162                 deb_chk("LLC_SNAP_FLAG_set is set\n");
163         if (v.irq_20c.Transport_Error)
164                 deb_chk("Transport error\n");
165
166         if ((fc_pci->count % 1000) == 0)
167                 deb_chk("%d valid irq took place so far\n", fc_pci->count);
168
169         if (v.irq_20c.DMA1_IRQ_Status == 1) {
170                 if (fc_pci->active_dma1_addr == 0)
171                         flexcop_pass_dmx_packets(fc_pci->fc_dev,
172                                         fc_pci->dma[0].cpu_addr0,
173                                         fc_pci->dma[0].size / 188);
174                 else
175                         flexcop_pass_dmx_packets(fc_pci->fc_dev,
176                                         fc_pci->dma[0].cpu_addr1,
177                                         fc_pci->dma[0].size / 188);
178
179                 deb_irq("page change to page: %d\n",!fc_pci->active_dma1_addr);
180                 fc_pci->active_dma1_addr = !fc_pci->active_dma1_addr;
181                 /* for the timer IRQ we only can use buffer dmx feeding, because we don't have
182                  * complete TS packets when reading from the DMA memory */
183         } else if (v.irq_20c.DMA1_Timer_Status == 1) {
184                 dma_addr_t cur_addr =
185                         fc->read_ibi_reg(fc,dma1_008).dma_0x8.dma_cur_addr << 2;
186                 u32 cur_pos = cur_addr - fc_pci->dma[0].dma_addr0;
187
188                 deb_irq("%u irq: %08x cur_addr: %llx: cur_pos: %08x, "
189                         "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, "
224                         "apparently without reason (%08x)\n", 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         u8 card_rev;
294
295         pci_read_config_byte(fc_pci->pdev, PCI_CLASS_REVISION, &card_rev);
296         info("card revision %x", card_rev);
297
298         if ((ret = pci_enable_device(fc_pci->pdev)) != 0)
299                 return ret;
300         pci_set_master(fc_pci->pdev);
301
302         if ((ret = pci_request_regions(fc_pci->pdev, DRIVER_NAME)) != 0)
303                 goto err_pci_disable_device;
304
305         fc_pci->io_mem = pci_iomap(fc_pci->pdev, 0, 0x800);
306
307         if (!fc_pci->io_mem) {
308                 err("cannot map io memory\n");
309                 ret = -EIO;
310                 goto err_pci_release_regions;
311         }
312
313         pci_set_drvdata(fc_pci->pdev, fc_pci);
314         spin_lock_init(&fc_pci->irq_lock);
315         if ((ret = request_irq(fc_pci->pdev->irq, flexcop_pci_isr,
316                                         IRQF_SHARED, DRIVER_NAME, fc_pci)) != 0)
317                 goto err_pci_iounmap;
318
319         fc_pci->init_state |= FC_PCI_INIT;
320         return ret;
321
322 err_pci_iounmap:
323         pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
324         pci_set_drvdata(fc_pci->pdev, NULL);
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_set_drvdata(fc_pci->pdev, NULL);
338                 pci_release_regions(fc_pci->pdev);
339                 pci_disable_device(fc_pci->pdev);
340         }
341         fc_pci->init_state &= ~FC_PCI_INIT;
342 }
343
344 static int flexcop_pci_probe(struct pci_dev *pdev,
345                 const struct pci_device_id *ent)
346 {
347         struct flexcop_device *fc;
348         struct flexcop_pci *fc_pci;
349         int ret = -ENOMEM;
350
351         if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_pci))) == NULL) {
352                 err("out of memory\n");
353                 return -ENOMEM;
354         }
355
356         /* general flexcop init */
357         fc_pci = fc->bus_specific;
358         fc_pci->fc_dev = fc;
359
360         fc->read_ibi_reg = flexcop_pci_read_ibi_reg;
361         fc->write_ibi_reg = flexcop_pci_write_ibi_reg;
362         fc->i2c_request = flexcop_i2c_request;
363         fc->get_mac_addr = flexcop_eeprom_check_mac_addr;
364         fc->stream_control = flexcop_pci_stream_control;
365
366         if (enable_pid_filtering)
367                 info("will use the HW PID filter.");
368         else
369                 info("will pass the complete TS to the demuxer.");
370
371         fc->pid_filtering = enable_pid_filtering;
372         fc->bus_type = FC_PCI;
373         fc->dev = &pdev->dev;
374         fc->owner = THIS_MODULE;
375
376         /* bus specific part */
377         fc_pci->pdev = pdev;
378         if ((ret = flexcop_pci_init(fc_pci)) != 0)
379                 goto err_kfree;
380
381         /* init flexcop */
382         if ((ret = flexcop_device_initialize(fc)) != 0)
383                 goto err_pci_exit;
384
385         /* init dma */
386         if ((ret = flexcop_pci_dma_init(fc_pci)) != 0)
387                 goto err_fc_exit;
388
389         INIT_DELAYED_WORK(&fc_pci->irq_check_work, flexcop_pci_irq_check_work);
390
391         if (irq_chk_intv > 0)
392                 schedule_delayed_work(&fc_pci->irq_check_work,
393                                 msecs_to_jiffies(irq_chk_intv < 100 ?
394                                         100 :
395                                         irq_chk_intv));
396         return ret;
397
398 err_fc_exit:
399         flexcop_device_exit(fc);
400 err_pci_exit:
401         flexcop_pci_exit(fc_pci);
402 err_kfree:
403         flexcop_device_kfree(fc);
404         return ret;
405 }
406
407 /* in theory every _exit function should be called exactly two times,
408  * here and in the bail-out-part of the _init-function
409  */
410 static void flexcop_pci_remove(struct pci_dev *pdev)
411 {
412         struct flexcop_pci *fc_pci = pci_get_drvdata(pdev);
413
414         if (irq_chk_intv > 0)
415                 cancel_delayed_work(&fc_pci->irq_check_work);
416
417         flexcop_pci_dma_exit(fc_pci);
418         flexcop_device_exit(fc_pci->fc_dev);
419         flexcop_pci_exit(fc_pci);
420         flexcop_device_kfree(fc_pci->fc_dev);
421 }
422
423 static struct pci_device_id flexcop_pci_tbl[] = {
424         { PCI_DEVICE(0x13d0, 0x2103) },
425         { },
426 };
427
428 MODULE_DEVICE_TABLE(pci, flexcop_pci_tbl);
429
430 static struct pci_driver flexcop_pci_driver = {
431         .name     = "b2c2_flexcop_pci",
432         .id_table = flexcop_pci_tbl,
433         .probe    = flexcop_pci_probe,
434         .remove   = flexcop_pci_remove,
435 };
436
437 static int __init flexcop_pci_module_init(void)
438 {
439         return pci_register_driver(&flexcop_pci_driver);
440 }
441
442 static void __exit flexcop_pci_module_exit(void)
443 {
444         pci_unregister_driver(&flexcop_pci_driver);
445 }
446
447 module_init(flexcop_pci_module_init);
448 module_exit(flexcop_pci_module_exit);
449
450 MODULE_AUTHOR(DRIVER_AUTHOR);
451 MODULE_DESCRIPTION(DRIVER_NAME);
452 MODULE_LICENSE("GPL");