IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[linux-3.10.git] / 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 static int irq_chk_intv;
17 module_param(irq_chk_intv, int, 0644);
18 MODULE_PARM_DESC(irq_chk_intv, "set the interval for IRQ watchdog (currently just debugging).");
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 = 0;
36 module_param(debug, int, 0644);
37 MODULE_PARM_DESC(debug, "set debug level (1=info,2=regs,4=TS,8=irqdma (|-able))." DEBSTATUS);
38
39 #define DRIVER_VERSION "0.1"
40 #define DRIVER_NAME "Technisat/B2C2 FlexCop II/IIb/III Digital TV PCI Driver"
41 #define DRIVER_AUTHOR "Patrick Boettcher <patrick.boettcher@desy.de>"
42
43 struct flexcop_pci {
44         struct pci_dev *pdev;
45
46 #define FC_PCI_INIT     0x01
47 #define FC_PCI_DMA_INIT 0x02
48         int init_state;
49
50         void __iomem *io_mem;
51         u32 irq;
52 /* buffersize (at least for DMA1, need to be % 188 == 0,
53  * this logic is required */
54 #define FC_DEFAULT_DMA1_BUFSIZE (1280 * 188)
55 #define FC_DEFAULT_DMA2_BUFSIZE (10 * 188)
56         struct flexcop_dma dma[2];
57
58         int active_dma1_addr; /* 0 = addr0 of dma1; 1 = addr1 of dma1 */
59         u32 last_dma1_cur_pos; /* position of the pointer last time the timer/packet irq occured */
60         int count;
61
62         spinlock_t irq_lock;
63
64         unsigned long last_irq;
65
66         struct work_struct irq_check_work;
67
68         struct flexcop_device *fc_dev;
69 };
70
71 static int lastwreg,lastwval,lastrreg,lastrval;
72
73 static flexcop_ibi_value flexcop_pci_read_ibi_reg (struct flexcop_device *fc, flexcop_ibi_register r)
74 {
75         struct flexcop_pci *fc_pci = fc->bus_specific;
76         flexcop_ibi_value v;
77         v.raw = readl(fc_pci->io_mem + r);
78
79         if (lastrreg != r || lastrval != v.raw) {
80                 lastrreg = r; lastrval = v.raw;
81                 deb_reg("new rd: %3x: %08x\n",r,v.raw);
82         }
83
84         return v;
85 }
86
87 static int flexcop_pci_write_ibi_reg(struct flexcop_device *fc, flexcop_ibi_register r, flexcop_ibi_value v)
88 {
89         struct flexcop_pci *fc_pci = fc->bus_specific;
90
91         if (lastwreg != r || lastwval != v.raw) {
92                 lastwreg = r; lastwval = v.raw;
93                 deb_reg("new wr: %3x: %08x\n",r,v.raw);
94         }
95
96         writel(v.raw, fc_pci->io_mem + r);
97         return 0;
98 }
99
100 static void flexcop_pci_irq_check_work(void *data)
101 {
102         struct flexcop_pci *fc_pci = data;
103         struct flexcop_device *fc = fc_pci->fc_dev;
104
105         flexcop_ibi_value v = fc->read_ibi_reg(fc,sram_dest_reg_714);
106
107         flexcop_dump_reg(fc_pci->fc_dev,dma1_000,4);
108
109         if (v.sram_dest_reg_714.net_ovflow_error)
110                 deb_chk("sram net_ovflow_error\n");
111         if (v.sram_dest_reg_714.media_ovflow_error)
112                 deb_chk("sram media_ovflow_error\n");
113         if (v.sram_dest_reg_714.cai_ovflow_error)
114                 deb_chk("sram cai_ovflow_error\n");
115         if (v.sram_dest_reg_714.cai_ovflow_error)
116                 deb_chk("sram cai_ovflow_error\n");
117
118         schedule_delayed_work(&fc_pci->irq_check_work,
119                         msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));
120 }
121
122 /* When PID filtering is turned on, we use the timer IRQ, because small amounts
123  * of data need to be passed to the user space instantly as well. When PID
124  * filtering is turned off, we use the page-change-IRQ */
125 static irqreturn_t flexcop_pci_isr(int irq, void *dev_id)
126 {
127         struct flexcop_pci *fc_pci = dev_id;
128         struct flexcop_device *fc = fc_pci->fc_dev;
129         flexcop_ibi_value v;
130         irqreturn_t ret = IRQ_HANDLED;
131
132         spin_lock_irq(&fc_pci->irq_lock);
133
134         v = fc->read_ibi_reg(fc,irq_20c);
135
136    /* errors */
137         if (v.irq_20c.Data_receiver_error)
138                 deb_chk("data receiver error\n");
139         if (v.irq_20c.Continuity_error_flag)
140                 deb_chk("Contunuity error flag is set\n");
141         if (v.irq_20c.LLC_SNAP_FLAG_set)
142                 deb_chk("LLC_SNAP_FLAG_set is set\n");
143         if (v.irq_20c.Transport_Error)
144                 deb_chk("Transport error\n");
145
146         if ((fc_pci->count % 1000) == 0)
147                 deb_chk("%d valid irq took place so far\n",fc_pci->count);
148
149         if (v.irq_20c.DMA1_IRQ_Status == 1) {
150                 if (fc_pci->active_dma1_addr == 0)
151                         flexcop_pass_dmx_packets(fc_pci->fc_dev,fc_pci->dma[0].cpu_addr0,fc_pci->dma[0].size / 188);
152                 else
153                         flexcop_pass_dmx_packets(fc_pci->fc_dev,fc_pci->dma[0].cpu_addr1,fc_pci->dma[0].size / 188);
154
155                 deb_irq("page change to page: %d\n",!fc_pci->active_dma1_addr);
156                 fc_pci->active_dma1_addr = !fc_pci->active_dma1_addr;
157         } else if (v.irq_20c.DMA1_Timer_Status == 1) {
158                 /* for the timer IRQ we only can use buffer dmx feeding, because we don't have
159                  * complete TS packets when reading from the DMA memory */
160                 dma_addr_t cur_addr =
161                         fc->read_ibi_reg(fc,dma1_008).dma_0x8.dma_cur_addr << 2;
162                 u32 cur_pos = cur_addr - fc_pci->dma[0].dma_addr0;
163
164                 deb_irq("%u irq: %08x cur_addr: %llx: cur_pos: %08x, last_cur_pos: %08x ",
165                                 jiffies_to_usecs(jiffies - fc_pci->last_irq),
166                                 v.raw, (unsigned long long)cur_addr, cur_pos,
167                                 fc_pci->last_dma1_cur_pos);
168                 fc_pci->last_irq = jiffies;
169
170                 /* buffer end was reached, restarted from the beginning
171                  * pass the data from last_cur_pos to the buffer end to the demux
172                  */
173                 if (cur_pos < fc_pci->last_dma1_cur_pos) {
174                         deb_irq(" end was reached: passing %d bytes ",(fc_pci->dma[0].size*2 - 1) - fc_pci->last_dma1_cur_pos);
175                         flexcop_pass_dmx_data(fc_pci->fc_dev,
176                                         fc_pci->dma[0].cpu_addr0 + fc_pci->last_dma1_cur_pos,
177                                         (fc_pci->dma[0].size*2) - fc_pci->last_dma1_cur_pos);
178                         fc_pci->last_dma1_cur_pos = 0;
179                 }
180
181                 if (cur_pos > fc_pci->last_dma1_cur_pos) {
182                         deb_irq(" passing %d bytes ",cur_pos - fc_pci->last_dma1_cur_pos);
183                         flexcop_pass_dmx_data(fc_pci->fc_dev,
184                                         fc_pci->dma[0].cpu_addr0 + fc_pci->last_dma1_cur_pos,
185                                         cur_pos - fc_pci->last_dma1_cur_pos);
186                 }
187                 deb_irq("\n");
188
189                 fc_pci->last_dma1_cur_pos = cur_pos;
190                 fc_pci->count++;
191         } else {
192                 deb_irq("isr for flexcop called, apparently without reason (%08x)\n",v.raw);
193                 ret = IRQ_NONE;
194         }
195
196         spin_unlock_irq(&fc_pci->irq_lock);
197
198         return ret;
199 }
200
201 static int flexcop_pci_stream_control(struct flexcop_device *fc, int onoff)
202 {
203         struct flexcop_pci *fc_pci = fc->bus_specific;
204         if (onoff) {
205                 flexcop_dma_config(fc,&fc_pci->dma[0],FC_DMA_1);
206                 flexcop_dma_config(fc,&fc_pci->dma[1],FC_DMA_2);
207
208                 flexcop_dma_config_timer(fc,FC_DMA_1,0);
209
210                 flexcop_dma_xfer_control(fc,FC_DMA_1,FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1,1);
211                 deb_irq("DMA xfer enabled\n");
212
213                 fc_pci->last_dma1_cur_pos = 0;
214                 flexcop_dma_control_timer_irq(fc,FC_DMA_1,1);
215                 deb_irq("IRQ enabled\n");
216
217 //              fc_pci->active_dma1_addr = 0;
218 //              flexcop_dma_control_size_irq(fc,FC_DMA_1,1);
219
220                 if (irq_chk_intv > 0)
221                         schedule_delayed_work(&fc_pci->irq_check_work,
222                                         msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));
223         } else {
224                 if (irq_chk_intv > 0)
225                         cancel_delayed_work(&fc_pci->irq_check_work);
226
227                 flexcop_dma_control_timer_irq(fc,FC_DMA_1,0);
228                 deb_irq("IRQ disabled\n");
229
230 //              flexcop_dma_control_size_irq(fc,FC_DMA_1,0);
231
232                 flexcop_dma_xfer_control(fc,FC_DMA_1,FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1,0);
233                 deb_irq("DMA xfer disabled\n");
234         }
235
236         return 0;
237 }
238
239 static int flexcop_pci_dma_init(struct flexcop_pci *fc_pci)
240 {
241         int ret;
242         if ((ret = flexcop_dma_allocate(fc_pci->pdev,&fc_pci->dma[0],FC_DEFAULT_DMA1_BUFSIZE)) != 0)
243                 return ret;
244
245         if ((ret = flexcop_dma_allocate(fc_pci->pdev,&fc_pci->dma[1],FC_DEFAULT_DMA2_BUFSIZE)) != 0) {
246                 flexcop_dma_free(&fc_pci->dma[0]);
247                 return ret;
248         }
249
250         flexcop_sram_set_dest(fc_pci->fc_dev,FC_SRAM_DEST_MEDIA | FC_SRAM_DEST_NET, FC_SRAM_DEST_TARGET_DMA1);
251         flexcop_sram_set_dest(fc_pci->fc_dev,FC_SRAM_DEST_CAO   | FC_SRAM_DEST_CAI, FC_SRAM_DEST_TARGET_DMA2);
252
253         fc_pci->init_state |= FC_PCI_DMA_INIT;
254
255         return ret;
256 }
257
258 static void flexcop_pci_dma_exit(struct flexcop_pci *fc_pci)
259 {
260         if (fc_pci->init_state & FC_PCI_DMA_INIT) {
261                 flexcop_dma_free(&fc_pci->dma[0]);
262                 flexcop_dma_free(&fc_pci->dma[1]);
263         }
264         fc_pci->init_state &= ~FC_PCI_DMA_INIT;
265 }
266
267 static int flexcop_pci_init(struct flexcop_pci *fc_pci)
268 {
269         int ret;
270         u8 card_rev;
271
272         pci_read_config_byte(fc_pci->pdev, PCI_CLASS_REVISION, &card_rev);
273         info("card revision %x", card_rev);
274
275         if ((ret = pci_enable_device(fc_pci->pdev)) != 0)
276                 return ret;
277
278         pci_set_master(fc_pci->pdev);
279
280         /* enable interrupts */
281         // pci_write_config_dword(pdev, 0x6c, 0x8000);
282
283         if ((ret = pci_request_regions(fc_pci->pdev, DRIVER_NAME)) != 0)
284                 goto err_pci_disable_device;
285
286         fc_pci->io_mem = pci_iomap(fc_pci->pdev, 0, 0x800);
287
288         if (!fc_pci->io_mem) {
289                 err("cannot map io memory\n");
290                 ret = -EIO;
291                 goto err_pci_release_regions;
292         }
293
294         pci_set_drvdata(fc_pci->pdev, fc_pci);
295
296         if ((ret = request_irq(fc_pci->pdev->irq, flexcop_pci_isr,
297                                         IRQF_SHARED, DRIVER_NAME, fc_pci)) != 0)
298                 goto err_pci_iounmap;
299
300         spin_lock_init(&fc_pci->irq_lock);
301
302         fc_pci->init_state |= FC_PCI_INIT;
303         return ret;
304
305 err_pci_iounmap:
306         pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
307         pci_set_drvdata(fc_pci->pdev, NULL);
308 err_pci_release_regions:
309         pci_release_regions(fc_pci->pdev);
310 err_pci_disable_device:
311         pci_disable_device(fc_pci->pdev);
312         return ret;
313 }
314
315 static void flexcop_pci_exit(struct flexcop_pci *fc_pci)
316 {
317         if (fc_pci->init_state & FC_PCI_INIT) {
318                 free_irq(fc_pci->pdev->irq, fc_pci);
319                 pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
320                 pci_set_drvdata(fc_pci->pdev, NULL);
321                 pci_release_regions(fc_pci->pdev);
322                 pci_disable_device(fc_pci->pdev);
323         }
324         fc_pci->init_state &= ~FC_PCI_INIT;
325 }
326
327
328 static int flexcop_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
329 {
330         struct flexcop_device *fc;
331         struct flexcop_pci *fc_pci;
332         int ret = -ENOMEM;
333
334         if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_pci))) == NULL) {
335                 err("out of memory\n");
336                 return -ENOMEM;
337         }
338
339 /* general flexcop init */
340         fc_pci = fc->bus_specific;
341         fc_pci->fc_dev = fc;
342
343         fc->read_ibi_reg = flexcop_pci_read_ibi_reg;
344         fc->write_ibi_reg = flexcop_pci_write_ibi_reg;
345         fc->i2c_request = flexcop_i2c_request;
346         fc->get_mac_addr = flexcop_eeprom_check_mac_addr;
347
348         fc->stream_control = flexcop_pci_stream_control;
349
350         if (enable_pid_filtering)
351                 info("will use the HW PID filter.");
352         else
353                 info("will pass the complete TS to the demuxer.");
354
355         fc->pid_filtering = enable_pid_filtering;
356         fc->bus_type = FC_PCI;
357
358         fc->dev = &pdev->dev;
359         fc->owner = THIS_MODULE;
360
361 /* bus specific part */
362         fc_pci->pdev = pdev;
363         if ((ret = flexcop_pci_init(fc_pci)) != 0)
364                 goto err_kfree;
365
366 /* init flexcop */
367         if ((ret = flexcop_device_initialize(fc)) != 0)
368                 goto err_pci_exit;
369
370 /* init dma */
371         if ((ret = flexcop_pci_dma_init(fc_pci)) != 0)
372                 goto err_fc_exit;
373
374         INIT_WORK(&fc_pci->irq_check_work, flexcop_pci_irq_check_work, fc_pci);
375
376         return ret;
377
378 err_fc_exit:
379         flexcop_device_exit(fc);
380 err_pci_exit:
381         flexcop_pci_exit(fc_pci);
382 err_kfree:
383         flexcop_device_kfree(fc);
384         return ret;
385 }
386
387 /* in theory every _exit function should be called exactly two times,
388  * here and in the bail-out-part of the _init-function
389  */
390 static void flexcop_pci_remove(struct pci_dev *pdev)
391 {
392         struct flexcop_pci *fc_pci = pci_get_drvdata(pdev);
393
394         flexcop_pci_dma_exit(fc_pci);
395         flexcop_device_exit(fc_pci->fc_dev);
396         flexcop_pci_exit(fc_pci);
397         flexcop_device_kfree(fc_pci->fc_dev);
398 }
399
400 static struct pci_device_id flexcop_pci_tbl[] = {
401         { PCI_DEVICE(0x13d0, 0x2103) },
402 /*      { PCI_DEVICE(0x13d0, 0x2200) }, ? */
403         { },
404 };
405
406 MODULE_DEVICE_TABLE(pci, flexcop_pci_tbl);
407
408 static struct pci_driver flexcop_pci_driver = {
409         .name     = "b2c2_flexcop_pci",
410         .id_table = flexcop_pci_tbl,
411         .probe    = flexcop_pci_probe,
412         .remove   = flexcop_pci_remove,
413 };
414
415 static int __init flexcop_pci_module_init(void)
416 {
417         return pci_register_driver(&flexcop_pci_driver);
418 }
419
420 static void __exit flexcop_pci_module_exit(void)
421 {
422         pci_unregister_driver(&flexcop_pci_driver);
423 }
424
425 module_init(flexcop_pci_module_init);
426 module_exit(flexcop_pci_module_exit);
427
428 MODULE_AUTHOR(DRIVER_AUTHOR);
429 MODULE_DESCRIPTION(DRIVER_NAME);
430 MODULE_LICENSE("GPL");