Free Electrons

Embedded Linux Experts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
/*
 * This file is part of linux driver the digital TV devices equipped with B2C2 FlexcopII(b)/III
 *
 * flexcop-pci.c - covers the PCI part including DMA transfers.
 *
 * see flexcop.c for copyright information.
 */

#define FC_LOG_PREFIX "flexcop-pci"
#include "flexcop-common.h"

static int enable_pid_filtering = 1;
module_param(enable_pid_filtering, int, 0444);
MODULE_PARM_DESC(enable_pid_filtering, "enable hardware pid filtering: supported values: 0 (fullts), 1");

static int irq_chk_intv;
module_param(irq_chk_intv, int, 0644);
MODULE_PARM_DESC(irq_chk_intv, "set the interval for IRQ watchdog (currently just debugging).");

#ifdef CONFIG_DVB_B2C2_FLEXCOP_DEBUG
#define dprintk(level,args...) \
	do { if ((debug & level)) printk(args); } while (0)
#define DEBSTATUS ""
#else
#define dprintk(level,args...)
#define DEBSTATUS " (debugging is not enabled)"
#endif

#define deb_info(args...)  dprintk(0x01,args)
#define deb_reg(args...)   dprintk(0x02,args)
#define deb_ts(args...)    dprintk(0x04,args)
#define deb_irq(args...)   dprintk(0x08,args)
#define deb_chk(args...)   dprintk(0x10,args)

static int debug = 0;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "set debug level (1=info,2=regs,4=TS,8=irqdma (|-able))." DEBSTATUS);

#define DRIVER_VERSION "0.1"
#define DRIVER_NAME "Technisat/B2C2 FlexCop II/IIb/III Digital TV PCI Driver"
#define DRIVER_AUTHOR "Patrick Boettcher <patrick.boettcher@desy.de>"

struct flexcop_pci {
	struct pci_dev *pdev;

#define FC_PCI_INIT     0x01
#define FC_PCI_DMA_INIT 0x02
	int init_state;

	void __iomem *io_mem;
	u32 irq;
/* buffersize (at least for DMA1, need to be % 188 == 0,
 * this logic is required */
#define FC_DEFAULT_DMA1_BUFSIZE (1280 * 188)
#define FC_DEFAULT_DMA2_BUFSIZE (10 * 188)
	struct flexcop_dma dma[2];

	int active_dma1_addr; /* 0 = addr0 of dma1; 1 = addr1 of dma1 */
	u32 last_dma1_cur_pos; /* position of the pointer last time the timer/packet irq occured */
	int count;

	spinlock_t irq_lock;

	unsigned long last_irq;

	struct work_struct irq_check_work;

	struct flexcop_device *fc_dev;
};

static int lastwreg,lastwval,lastrreg,lastrval;

static flexcop_ibi_value flexcop_pci_read_ibi_reg (struct flexcop_device *fc, flexcop_ibi_register r)
{
	struct flexcop_pci *fc_pci = fc->bus_specific;
	flexcop_ibi_value v;
	v.raw = readl(fc_pci->io_mem + r);

	if (lastrreg != r || lastrval != v.raw) {
		lastrreg = r; lastrval = v.raw;
		deb_reg("new rd: %3x: %08x\n",r,v.raw);
	}

	return v;
}

static int flexcop_pci_write_ibi_reg(struct flexcop_device *fc, flexcop_ibi_register r, flexcop_ibi_value v)
{
	struct flexcop_pci *fc_pci = fc->bus_specific;

	if (lastwreg != r || lastwval != v.raw) {
		lastwreg = r; lastwval = v.raw;
		deb_reg("new wr: %3x: %08x\n",r,v.raw);
	}

	writel(v.raw, fc_pci->io_mem + r);
	return 0;
}

static void flexcop_pci_irq_check_work(void *data)
{
	struct flexcop_pci *fc_pci = data;
	struct flexcop_device *fc = fc_pci->fc_dev;

	flexcop_ibi_value v = fc->read_ibi_reg(fc,sram_dest_reg_714);

	flexcop_dump_reg(fc_pci->fc_dev,dma1_000,4);

	if (v.sram_dest_reg_714.net_ovflow_error)
		deb_chk("sram net_ovflow_error\n");
	if (v.sram_dest_reg_714.media_ovflow_error)
		deb_chk("sram media_ovflow_error\n");
	if (v.sram_dest_reg_714.cai_ovflow_error)
		deb_chk("sram cai_ovflow_error\n");
	if (v.sram_dest_reg_714.cai_ovflow_error)
		deb_chk("sram cai_ovflow_error\n");

	schedule_delayed_work(&fc_pci->irq_check_work,
			msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));
}

/* When PID filtering is turned on, we use the timer IRQ, because small amounts
 * of data need to be passed to the user space instantly as well. When PID
 * filtering is turned off, we use the page-change-IRQ */
static irqreturn_t flexcop_pci_isr(int irq, void *dev_id, struct pt_regs *regs)
{
	struct flexcop_pci *fc_pci = dev_id;
	struct flexcop_device *fc = fc_pci->fc_dev;
	flexcop_ibi_value v;
	irqreturn_t ret = IRQ_HANDLED;

	spin_lock_irq(&fc_pci->irq_lock);

	v = fc->read_ibi_reg(fc,irq_20c);

   /* errors */
	if (v.irq_20c.Data_receiver_error)
		deb_chk("data receiver error\n");
	if (v.irq_20c.Continuity_error_flag)
		deb_chk("Contunuity error flag is set\n");
	if (v.irq_20c.LLC_SNAP_FLAG_set)
		deb_chk("LLC_SNAP_FLAG_set is set\n");
	if (v.irq_20c.Transport_Error)
		deb_chk("Transport error\n");

	if ((fc_pci->count % 1000) == 0)
		deb_chk("%d valid irq took place so far\n",fc_pci->count);

	if (v.irq_20c.DMA1_IRQ_Status == 1) {
		if (fc_pci->active_dma1_addr == 0)
			flexcop_pass_dmx_packets(fc_pci->fc_dev,fc_pci->dma[0].cpu_addr0,fc_pci->dma[0].size / 188);
		else
			flexcop_pass_dmx_packets(fc_pci->fc_dev,fc_pci->dma[0].cpu_addr1,fc_pci->dma[0].size / 188);

		deb_irq("page change to page: %d\n",!fc_pci->active_dma1_addr);
		fc_pci->active_dma1_addr = !fc_pci->active_dma1_addr;
	} else if (v.irq_20c.DMA1_Timer_Status == 1) {
		/* for the timer IRQ we only can use buffer dmx feeding, because we don't have
		 * complete TS packets when reading from the DMA memory */
		dma_addr_t cur_addr =
			fc->read_ibi_reg(fc,dma1_008).dma_0x8.dma_cur_addr << 2;
		u32 cur_pos = cur_addr - fc_pci->dma[0].dma_addr0;

		deb_irq("%u irq: %08x cur_addr: %08x: cur_pos: %08x, last_cur_pos: %08x ",
				jiffies_to_usecs(jiffies - fc_pci->last_irq),v.raw,cur_addr,cur_pos,fc_pci->last_dma1_cur_pos);
		fc_pci->last_irq = jiffies;

		/* buffer end was reached, restarted from the beginning
		 * pass the data from last_cur_pos to the buffer end to the demux
		 */
		if (cur_pos < fc_pci->last_dma1_cur_pos) {
			deb_irq(" end was reached: passing %d bytes ",(fc_pci->dma[0].size*2 - 1) - fc_pci->last_dma1_cur_pos);
			flexcop_pass_dmx_data(fc_pci->fc_dev,
					fc_pci->dma[0].cpu_addr0 + fc_pci->last_dma1_cur_pos,
					(fc_pci->dma[0].size*2) - fc_pci->last_dma1_cur_pos);
			fc_pci->last_dma1_cur_pos = 0;
		}

		if (cur_pos > fc_pci->last_dma1_cur_pos) {
			deb_irq(" passing %d bytes ",cur_pos - fc_pci->last_dma1_cur_pos);
			flexcop_pass_dmx_data(fc_pci->fc_dev,
					fc_pci->dma[0].cpu_addr0 + fc_pci->last_dma1_cur_pos,
					cur_pos - fc_pci->last_dma1_cur_pos);
		}
		deb_irq("\n");

		fc_pci->last_dma1_cur_pos = cur_pos;
		fc_pci->count++;
	} else {
		deb_irq("isr for flexcop called, apparently without reason (%08x)\n",v.raw);
		ret = IRQ_NONE;
	}

	spin_unlock_irq(&fc_pci->irq_lock);

	return ret;
}

static int flexcop_pci_stream_control(struct flexcop_device *fc, int onoff)
{
	struct flexcop_pci *fc_pci = fc->bus_specific;
	if (onoff) {
		flexcop_dma_config(fc,&fc_pci->dma[0],FC_DMA_1);
		flexcop_dma_config(fc,&fc_pci->dma[1],FC_DMA_2);

		flexcop_dma_config_timer(fc,FC_DMA_1,0);

		flexcop_dma_xfer_control(fc,FC_DMA_1,FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1,1);
		deb_irq("DMA xfer enabled\n");

		fc_pci->last_dma1_cur_pos = 0;
		flexcop_dma_control_timer_irq(fc,FC_DMA_1,1);
		deb_irq("IRQ enabled\n");

//		fc_pci->active_dma1_addr = 0;
//		flexcop_dma_control_size_irq(fc,FC_DMA_1,1);

		if (irq_chk_intv > 0)
			schedule_delayed_work(&fc_pci->irq_check_work,
					msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));
	} else {
		if (irq_chk_intv > 0)
			cancel_delayed_work(&fc_pci->irq_check_work);

		flexcop_dma_control_timer_irq(fc,FC_DMA_1,0);
		deb_irq("IRQ disabled\n");

//		flexcop_dma_control_size_irq(fc,FC_DMA_1,0);

		flexcop_dma_xfer_control(fc,FC_DMA_1,FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1,0);
		deb_irq("DMA xfer disabled\n");
	}

	return 0;
}

static int flexcop_pci_dma_init(struct flexcop_pci *fc_pci)
{
	int ret;
	if ((ret = flexcop_dma_allocate(fc_pci->pdev,&fc_pci->dma[0],FC_DEFAULT_DMA1_BUFSIZE)) != 0)
		return ret;

	if ((ret = flexcop_dma_allocate(fc_pci->pdev,&fc_pci->dma[1],FC_DEFAULT_DMA2_BUFSIZE)) != 0)
		goto dma1_free;

	flexcop_sram_set_dest(fc_pci->fc_dev,FC_SRAM_DEST_MEDIA | FC_SRAM_DEST_NET, FC_SRAM_DEST_TARGET_DMA1);
	flexcop_sram_set_dest(fc_pci->fc_dev,FC_SRAM_DEST_CAO   | FC_SRAM_DEST_CAI, FC_SRAM_DEST_TARGET_DMA2);

	fc_pci->init_state |= FC_PCI_DMA_INIT;

	goto success;
dma1_free:
	flexcop_dma_free(&fc_pci->dma[0]);

success:
	return ret;
}

static void flexcop_pci_dma_exit(struct flexcop_pci *fc_pci)
{
	if (fc_pci->init_state & FC_PCI_DMA_INIT) {
		flexcop_dma_free(&fc_pci->dma[0]);
		flexcop_dma_free(&fc_pci->dma[1]);
	}
	fc_pci->init_state &= ~FC_PCI_DMA_INIT;
}

static int flexcop_pci_init(struct flexcop_pci *fc_pci)
{
	int ret;
	u8 card_rev;

	pci_read_config_byte(fc_pci->pdev, PCI_CLASS_REVISION, &card_rev);
	info("card revision %x", card_rev);

	if ((ret = pci_enable_device(fc_pci->pdev)) != 0)
		return ret;

	pci_set_master(fc_pci->pdev);

	/* enable interrupts */
	// pci_write_config_dword(pdev, 0x6c, 0x8000);

	if ((ret = pci_request_regions(fc_pci->pdev, DRIVER_NAME)) != 0)
		goto err_pci_disable_device;

	fc_pci->io_mem = pci_iomap(fc_pci->pdev, 0, 0x800);

	if (!fc_pci->io_mem) {
		err("cannot map io memory\n");
		ret = -EIO;
		goto err_pci_release_regions;
	}

	pci_set_drvdata(fc_pci->pdev, fc_pci);

	if ((ret = request_irq(fc_pci->pdev->irq, flexcop_pci_isr,
					SA_SHIRQ, DRIVER_NAME, fc_pci)) != 0)
		goto err_pci_iounmap;

	spin_lock_init(&fc_pci->irq_lock);

	fc_pci->init_state |= FC_PCI_INIT;
	goto success;

err_pci_iounmap:
	pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
	pci_set_drvdata(fc_pci->pdev, NULL);
err_pci_release_regions:
	pci_release_regions(fc_pci->pdev);
err_pci_disable_device:
	pci_disable_device(fc_pci->pdev);

success:
	return ret;
}

static void flexcop_pci_exit(struct flexcop_pci *fc_pci)
{
	if (fc_pci->init_state & FC_PCI_INIT) {
		free_irq(fc_pci->pdev->irq, fc_pci);
		pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
		pci_set_drvdata(fc_pci->pdev, NULL);
		pci_release_regions(fc_pci->pdev);
		pci_disable_device(fc_pci->pdev);
	}
	fc_pci->init_state &= ~FC_PCI_INIT;
}


static int flexcop_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	struct flexcop_device *fc;
	struct flexcop_pci *fc_pci;
	int ret = -ENOMEM;

	if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_pci))) == NULL) {
		err("out of memory\n");
		return -ENOMEM;
	}

/* general flexcop init */
	fc_pci = fc->bus_specific;
	fc_pci->fc_dev = fc;

	fc->read_ibi_reg = flexcop_pci_read_ibi_reg;
	fc->write_ibi_reg = flexcop_pci_write_ibi_reg;
	fc->i2c_request = flexcop_i2c_request;
	fc->get_mac_addr = flexcop_eeprom_check_mac_addr;

	fc->stream_control = flexcop_pci_stream_control;

	if (enable_pid_filtering)
		info("will use the HW PID filter.");
	else
		info("will pass the complete TS to the demuxer.");

	fc->pid_filtering = enable_pid_filtering;
	fc->bus_type = FC_PCI;

	fc->dev = &pdev->dev;
	fc->owner = THIS_MODULE;

/* bus specific part */
	fc_pci->pdev = pdev;
	if ((ret = flexcop_pci_init(fc_pci)) != 0)
		goto err_kfree;

/* init flexcop */
	if ((ret = flexcop_device_initialize(fc)) != 0)
		goto err_pci_exit;

/* init dma */
	if ((ret = flexcop_pci_dma_init(fc_pci)) != 0)
		goto err_fc_exit;

	INIT_WORK(&fc_pci->irq_check_work, flexcop_pci_irq_check_work, fc_pci);

	goto success;
err_fc_exit:
	flexcop_device_exit(fc);
err_pci_exit:
	flexcop_pci_exit(fc_pci);
err_kfree:
	flexcop_device_kfree(fc);
success:
	return ret;
}

/* in theory every _exit function should be called exactly two times,
 * here and in the bail-out-part of the _init-function
 */
static void flexcop_pci_remove(struct pci_dev *pdev)
{
	struct flexcop_pci *fc_pci = pci_get_drvdata(pdev);

	flexcop_pci_dma_exit(fc_pci);
	flexcop_device_exit(fc_pci->fc_dev);
	flexcop_pci_exit(fc_pci);
	flexcop_device_kfree(fc_pci->fc_dev);
}

static struct pci_device_id flexcop_pci_tbl[] = {
	{ PCI_DEVICE(0x13d0, 0x2103) },
/*	{ PCI_DEVICE(0x13d0, 0x2200) }, ? */
	{ },
};

MODULE_DEVICE_TABLE(pci, flexcop_pci_tbl);

static struct pci_driver flexcop_pci_driver = {
	.name     = "b2c2_flexcop_pci",
	.id_table = flexcop_pci_tbl,
	.probe    = flexcop_pci_probe,
	.remove   = flexcop_pci_remove,
};

static int __init flexcop_pci_module_init(void)
{
	return pci_register_driver(&flexcop_pci_driver);
}

static void __exit flexcop_pci_module_exit(void)
{
	pci_unregister_driver(&flexcop_pci_driver);
}

module_init(flexcop_pci_module_init);
module_exit(flexcop_pci_module_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_NAME);
MODULE_LICENSE("GPL");