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...) no_printk(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 | if (cur_pos > fc_pci->dma[0].size * 2) |
189 | goto error; |
190 | |
191 | deb_irq("%u irq: %08x cur_addr: %llx: cur_pos: %08x, last_cur_pos: %08x " , |
192 | jiffies_to_usecs(jiffies - fc_pci->last_irq), |
193 | v.raw, (unsigned long long)cur_addr, cur_pos, |
194 | fc_pci->last_dma1_cur_pos); |
195 | fc_pci->last_irq = jiffies; |
196 | |
197 | /* buffer end was reached, restarted from the beginning |
198 | * pass the data from last_cur_pos to the buffer end to the demux |
199 | */ |
200 | if (cur_pos < fc_pci->last_dma1_cur_pos) { |
201 | deb_irq(" end was reached: passing %d bytes " , |
202 | (fc_pci->dma[0].size*2 - 1) - |
203 | fc_pci->last_dma1_cur_pos); |
204 | flexcop_pass_dmx_data(fc_pci->fc_dev, |
205 | fc_pci->dma[0].cpu_addr0 + |
206 | fc_pci->last_dma1_cur_pos, |
207 | (fc_pci->dma[0].size*2) - |
208 | fc_pci->last_dma1_cur_pos); |
209 | fc_pci->last_dma1_cur_pos = 0; |
210 | } |
211 | |
212 | if (cur_pos > fc_pci->last_dma1_cur_pos) { |
213 | deb_irq(" passing %d bytes " , |
214 | cur_pos - fc_pci->last_dma1_cur_pos); |
215 | flexcop_pass_dmx_data(fc_pci->fc_dev, |
216 | fc_pci->dma[0].cpu_addr0 + |
217 | fc_pci->last_dma1_cur_pos, |
218 | cur_pos - fc_pci->last_dma1_cur_pos); |
219 | } |
220 | deb_irq("\n" ); |
221 | |
222 | fc_pci->last_dma1_cur_pos = cur_pos; |
223 | fc_pci->count++; |
224 | } else { |
225 | deb_irq("isr for flexcop called, apparently without reason (%08x)\n" , |
226 | v.raw); |
227 | ret = IRQ_NONE; |
228 | } |
229 | |
230 | error: |
231 | spin_unlock_irqrestore(&fc_pci->irq_lock, flags); |
232 | return ret; |
233 | } |
234 | |
235 | static int flexcop_pci_stream_control(struct flexcop_device *fc, int onoff) |
236 | { |
237 | struct flexcop_pci *fc_pci = fc->bus_specific; |
238 | if (onoff) { |
239 | flexcop_dma_config(fc, &fc_pci->dma[0], FC_DMA_1); |
240 | flexcop_dma_config(fc, &fc_pci->dma[1], FC_DMA_2); |
241 | flexcop_dma_config_timer(fc, FC_DMA_1, 0); |
242 | flexcop_dma_xfer_control(fc, FC_DMA_1, |
243 | FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1, 1); |
244 | deb_irq("DMA xfer enabled\n" ); |
245 | |
246 | fc_pci->last_dma1_cur_pos = 0; |
247 | flexcop_dma_control_timer_irq(fc, FC_DMA_1, 1); |
248 | deb_irq("IRQ enabled\n" ); |
249 | fc_pci->count_prev = fc_pci->count; |
250 | } else { |
251 | flexcop_dma_control_timer_irq(fc, FC_DMA_1, 0); |
252 | deb_irq("IRQ disabled\n" ); |
253 | |
254 | flexcop_dma_xfer_control(fc, FC_DMA_1, |
255 | FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1, 0); |
256 | deb_irq("DMA xfer disabled\n" ); |
257 | } |
258 | return 0; |
259 | } |
260 | |
261 | static int flexcop_pci_dma_init(struct flexcop_pci *fc_pci) |
262 | { |
263 | int ret; |
264 | ret = flexcop_dma_allocate(fc_pci->pdev, &fc_pci->dma[0], |
265 | FC_DEFAULT_DMA1_BUFSIZE); |
266 | if (ret != 0) |
267 | return ret; |
268 | |
269 | ret = flexcop_dma_allocate(fc_pci->pdev, &fc_pci->dma[1], |
270 | FC_DEFAULT_DMA2_BUFSIZE); |
271 | if (ret != 0) { |
272 | flexcop_dma_free(&fc_pci->dma[0]); |
273 | return ret; |
274 | } |
275 | |
276 | flexcop_sram_set_dest(fc_pci->fc_dev, FC_SRAM_DEST_MEDIA | |
277 | FC_SRAM_DEST_NET, FC_SRAM_DEST_TARGET_DMA1); |
278 | flexcop_sram_set_dest(fc_pci->fc_dev, FC_SRAM_DEST_CAO | |
279 | FC_SRAM_DEST_CAI, FC_SRAM_DEST_TARGET_DMA2); |
280 | fc_pci->init_state |= FC_PCI_DMA_INIT; |
281 | return ret; |
282 | } |
283 | |
284 | static void flexcop_pci_dma_exit(struct flexcop_pci *fc_pci) |
285 | { |
286 | if (fc_pci->init_state & FC_PCI_DMA_INIT) { |
287 | flexcop_dma_free(&fc_pci->dma[0]); |
288 | flexcop_dma_free(&fc_pci->dma[1]); |
289 | } |
290 | fc_pci->init_state &= ~FC_PCI_DMA_INIT; |
291 | } |
292 | |
293 | static int flexcop_pci_init(struct flexcop_pci *fc_pci) |
294 | { |
295 | int ret; |
296 | |
297 | info("card revision %x" , fc_pci->pdev->revision); |
298 | |
299 | if ((ret = pci_enable_device(fc_pci->pdev)) != 0) |
300 | return ret; |
301 | pci_set_master(fc_pci->pdev); |
302 | |
303 | if ((ret = pci_request_regions(fc_pci->pdev, DRIVER_NAME)) != 0) |
304 | goto err_pci_disable_device; |
305 | |
306 | fc_pci->io_mem = pci_iomap(fc_pci->pdev, 0, 0x800); |
307 | |
308 | if (!fc_pci->io_mem) { |
309 | err("cannot map io memory\n" ); |
310 | ret = -EIO; |
311 | goto err_pci_release_regions; |
312 | } |
313 | |
314 | pci_set_drvdata(fc_pci->pdev, fc_pci); |
315 | spin_lock_init(&fc_pci->irq_lock); |
316 | if ((ret = request_irq(fc_pci->pdev->irq, flexcop_pci_isr, |
317 | IRQF_SHARED, DRIVER_NAME, fc_pci)) != 0) |
318 | goto err_pci_iounmap; |
319 | |
320 | fc_pci->init_state |= FC_PCI_INIT; |
321 | return ret; |
322 | |
323 | err_pci_iounmap: |
324 | pci_iounmap(fc_pci->pdev, fc_pci->io_mem); |
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_release_regions(fc_pci->pdev); |
338 | pci_disable_device(fc_pci->pdev); |
339 | } |
340 | fc_pci->init_state &= ~FC_PCI_INIT; |
341 | } |
342 | |
343 | static int flexcop_pci_probe(struct pci_dev *pdev, |
344 | const struct pci_device_id *ent) |
345 | { |
346 | struct flexcop_device *fc; |
347 | struct flexcop_pci *fc_pci; |
348 | int ret = -ENOMEM; |
349 | |
350 | if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_pci))) == NULL) { |
351 | err("out of memory\n" ); |
352 | return -ENOMEM; |
353 | } |
354 | |
355 | /* general flexcop init */ |
356 | fc_pci = fc->bus_specific; |
357 | fc_pci->fc_dev = fc; |
358 | |
359 | fc->read_ibi_reg = flexcop_pci_read_ibi_reg; |
360 | fc->write_ibi_reg = flexcop_pci_write_ibi_reg; |
361 | fc->i2c_request = flexcop_i2c_request; |
362 | fc->get_mac_addr = flexcop_eeprom_check_mac_addr; |
363 | fc->stream_control = flexcop_pci_stream_control; |
364 | |
365 | if (enable_pid_filtering) |
366 | info("will use the HW PID filter." ); |
367 | else |
368 | info("will pass the complete TS to the demuxer." ); |
369 | |
370 | fc->pid_filtering = enable_pid_filtering; |
371 | fc->bus_type = FC_PCI; |
372 | fc->dev = &pdev->dev; |
373 | fc->owner = THIS_MODULE; |
374 | |
375 | /* bus specific part */ |
376 | fc_pci->pdev = pdev; |
377 | if ((ret = flexcop_pci_init(fc_pci)) != 0) |
378 | goto err_kfree; |
379 | |
380 | /* init flexcop */ |
381 | if ((ret = flexcop_device_initialize(fc)) != 0) |
382 | goto err_pci_exit; |
383 | |
384 | /* init dma */ |
385 | if ((ret = flexcop_pci_dma_init(fc_pci)) != 0) |
386 | goto err_fc_exit; |
387 | |
388 | INIT_DELAYED_WORK(&fc_pci->irq_check_work, flexcop_pci_irq_check_work); |
389 | |
390 | if (irq_chk_intv > 0) |
391 | schedule_delayed_work(&fc_pci->irq_check_work, |
392 | msecs_to_jiffies(irq_chk_intv < 100 ? |
393 | 100 : |
394 | irq_chk_intv)); |
395 | return ret; |
396 | |
397 | err_fc_exit: |
398 | flexcop_device_exit(fc); |
399 | err_pci_exit: |
400 | flexcop_pci_exit(fc_pci); |
401 | err_kfree: |
402 | flexcop_device_kfree(fc); |
403 | return ret; |
404 | } |
405 | |
406 | /* in theory every _exit function should be called exactly two times, |
407 | * here and in the bail-out-part of the _init-function |
408 | */ |
409 | static void flexcop_pci_remove(struct pci_dev *pdev) |
410 | { |
411 | struct flexcop_pci *fc_pci = pci_get_drvdata(pdev); |
412 | |
413 | if (irq_chk_intv > 0) |
414 | cancel_delayed_work(&fc_pci->irq_check_work); |
415 | |
416 | flexcop_pci_dma_exit(fc_pci); |
417 | flexcop_device_exit(fc_pci->fc_dev); |
418 | flexcop_pci_exit(fc_pci); |
419 | flexcop_device_kfree(fc_pci->fc_dev); |
420 | } |
421 | |
422 | static const struct pci_device_id flexcop_pci_tbl[] = { |
423 | { PCI_DEVICE(0x13d0, 0x2103) }, |
424 | { }, |
425 | }; |
426 | |
427 | MODULE_DEVICE_TABLE(pci, flexcop_pci_tbl); |
428 | |
429 | static struct pci_driver flexcop_pci_driver = { |
430 | .name = "b2c2_flexcop_pci" , |
431 | .id_table = flexcop_pci_tbl, |
432 | .probe = flexcop_pci_probe, |
433 | .remove = flexcop_pci_remove, |
434 | }; |
435 | |
436 | module_pci_driver(flexcop_pci_driver); |
437 | |
438 | MODULE_AUTHOR(DRIVER_AUTHOR); |
439 | MODULE_DESCRIPTION(DRIVER_NAME); |
440 | MODULE_LICENSE("GPL" ); |
441 | |