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Merge branch 'for-linus' of git://github.com/schandinat/linux-2.6
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / comedi / drivers / gsc_hpdi.c
1 /*
2 comedi/drivers/gsc_hpdi.c
3 This is a driver for the General Standards Corporation High
4 Speed Parallel Digital Interface rs485 boards.
5
6 Author: Frank Mori Hess <fmhess@users.sourceforge.net>
7 Copyright (C) 2003 Coherent Imaging Systems
8
9 COMEDI - Linux Control and Measurement Device Interface
10 Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
11
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
16
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
21
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25
26 ************************************************************************/
27
28 /*
29
30 Driver: gsc_hpdi
31 Description: General Standards Corporation High
32 Speed Parallel Digital Interface rs485 boards
33 Author: Frank Mori Hess <fmhess@users.sourceforge.net>
34 Status: only receive mode works, transmit not supported
35 Updated: 2003-02-20
36 Devices: [General Standards Corporation] PCI-HPDI32 (gsc_hpdi),
37 PMC-HPDI32
38
39 Configuration options:
40 [0] - PCI bus of device (optional)
41 [1] - PCI slot of device (optional)
42
43 There are some additional hpdi models available from GSC for which
44 support could be added to this driver.
45
46 */
47
48 #include <linux/interrupt.h>
49 #include "../comedidev.h"
50 #include <linux/delay.h>
51
52 #include "comedi_pci.h"
53 #include "plx9080.h"
54 #include "comedi_fc.h"
55
56 static int hpdi_attach(struct comedi_device *dev, struct comedi_devconfig *it);
57 static int hpdi_detach(struct comedi_device *dev);
58 static void abort_dma(struct comedi_device *dev, unsigned int channel);
59 static int hpdi_cmd(struct comedi_device *dev, struct comedi_subdevice *s);
60 static int hpdi_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
61 struct comedi_cmd *cmd);
62 static int hpdi_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
63 static irqreturn_t handle_interrupt(int irq, void *d);
64 static int dio_config_block_size(struct comedi_device *dev, unsigned int *data);
65
66 #undef HPDI_DEBUG /* disable debugging messages */
67 /* #define HPDI_DEBUG enable debugging code */
68
69 #ifdef HPDI_DEBUG
70 #define DEBUG_PRINT(format, args...) printk(format , ## args)
71 #else
72 #define DEBUG_PRINT(format, args...)
73 #endif
74
75 #define TIMER_BASE 50 /* 20MHz master clock */
76 #define DMA_BUFFER_SIZE 0x10000
77 #define NUM_DMA_BUFFERS 4
78 #define NUM_DMA_DESCRIPTORS 256
79
80 /* indices of base address regions */
81 enum base_address_regions {
82 PLX9080_BADDRINDEX = 0,
83 HPDI_BADDRINDEX = 2,
84 };
85
86 enum hpdi_registers {
87 FIRMWARE_REV_REG = 0x0,
88 BOARD_CONTROL_REG = 0x4,
89 BOARD_STATUS_REG = 0x8,
90 TX_PROG_ALMOST_REG = 0xc,
91 RX_PROG_ALMOST_REG = 0x10,
92 FEATURES_REG = 0x14,
93 FIFO_REG = 0x18,
94 TX_STATUS_COUNT_REG = 0x1c,
95 TX_LINE_VALID_COUNT_REG = 0x20,
96 TX_LINE_INVALID_COUNT_REG = 0x24,
97 RX_STATUS_COUNT_REG = 0x28,
98 RX_LINE_COUNT_REG = 0x2c,
99 INTERRUPT_CONTROL_REG = 0x30,
100 INTERRUPT_STATUS_REG = 0x34,
101 TX_CLOCK_DIVIDER_REG = 0x38,
102 TX_FIFO_SIZE_REG = 0x40,
103 RX_FIFO_SIZE_REG = 0x44,
104 TX_FIFO_WORDS_REG = 0x48,
105 RX_FIFO_WORDS_REG = 0x4c,
106 INTERRUPT_EDGE_LEVEL_REG = 0x50,
107 INTERRUPT_POLARITY_REG = 0x54,
108 };
109
110 int command_channel_valid(unsigned int channel)
111 {
112 if (channel == 0 || channel > 6) {
113 printk(KERN_WARNING
114 "gsc_hpdi: bug! invalid cable command channel\n");
115 return 0;
116 }
117 return 1;
118 }
119
120 /* bit definitions */
121
122 enum firmware_revision_bits {
123 FEATURES_REG_PRESENT_BIT = 0x8000,
124 };
125 int firmware_revision(uint32_t fwr_bits)
126 {
127 return fwr_bits & 0xff;
128 }
129
130 int pcb_revision(uint32_t fwr_bits)
131 {
132 return (fwr_bits >> 8) & 0xff;
133 }
134
135 int hpdi_subid(uint32_t fwr_bits)
136 {
137 return (fwr_bits >> 16) & 0xff;
138 }
139
140 enum board_control_bits {
141 BOARD_RESET_BIT = 0x1, /* wait 10usec before accessing fifos */
142 TX_FIFO_RESET_BIT = 0x2,
143 RX_FIFO_RESET_BIT = 0x4,
144 TX_ENABLE_BIT = 0x10,
145 RX_ENABLE_BIT = 0x20,
146 DEMAND_DMA_DIRECTION_TX_BIT = 0x40,
147 /* for ch 0, ch 1 can only transmit (when present) */
148 LINE_VALID_ON_STATUS_VALID_BIT = 0x80,
149 START_TX_BIT = 0x10,
150 CABLE_THROTTLE_ENABLE_BIT = 0x20,
151 TEST_MODE_ENABLE_BIT = 0x80000000,
152 };
153 uint32_t command_discrete_output_bits(unsigned int channel, int output,
154 int output_value)
155 {
156 uint32_t bits = 0;
157
158 if (command_channel_valid(channel) == 0)
159 return 0;
160 if (output) {
161 bits |= 0x1 << (16 + channel);
162 if (output_value)
163 bits |= 0x1 << (24 + channel);
164 } else
165 bits |= 0x1 << (24 + channel);
166
167 return bits;
168 }
169
170 enum board_status_bits {
171 COMMAND_LINE_STATUS_MASK = 0x7f,
172 TX_IN_PROGRESS_BIT = 0x80,
173 TX_NOT_EMPTY_BIT = 0x100,
174 TX_NOT_ALMOST_EMPTY_BIT = 0x200,
175 TX_NOT_ALMOST_FULL_BIT = 0x400,
176 TX_NOT_FULL_BIT = 0x800,
177 RX_NOT_EMPTY_BIT = 0x1000,
178 RX_NOT_ALMOST_EMPTY_BIT = 0x2000,
179 RX_NOT_ALMOST_FULL_BIT = 0x4000,
180 RX_NOT_FULL_BIT = 0x8000,
181 BOARD_JUMPER0_INSTALLED_BIT = 0x10000,
182 BOARD_JUMPER1_INSTALLED_BIT = 0x20000,
183 TX_OVERRUN_BIT = 0x200000,
184 RX_UNDERRUN_BIT = 0x400000,
185 RX_OVERRUN_BIT = 0x800000,
186 };
187
188 uint32_t almost_full_bits(unsigned int num_words)
189 {
190 /* XXX need to add or subtract one? */
191 return (num_words << 16) & 0xff0000;
192 }
193
194 uint32_t almost_empty_bits(unsigned int num_words)
195 {
196 return num_words & 0xffff;
197 }
198
199 unsigned int almost_full_num_words(uint32_t bits)
200 {
201 /* XXX need to add or subtract one? */
202 return (bits >> 16) & 0xffff;
203 }
204
205 unsigned int almost_empty_num_words(uint32_t bits)
206 {
207 return bits & 0xffff;
208 }
209
210 enum features_bits {
211 FIFO_SIZE_PRESENT_BIT = 0x1,
212 FIFO_WORDS_PRESENT_BIT = 0x2,
213 LEVEL_EDGE_INTERRUPTS_PRESENT_BIT = 0x4,
214 GPIO_SUPPORTED_BIT = 0x8,
215 PLX_DMA_CH1_SUPPORTED_BIT = 0x10,
216 OVERRUN_UNDERRUN_SUPPORTED_BIT = 0x20,
217 };
218
219 enum interrupt_sources {
220 FRAME_VALID_START_INTR = 0,
221 FRAME_VALID_END_INTR = 1,
222 TX_FIFO_EMPTY_INTR = 8,
223 TX_FIFO_ALMOST_EMPTY_INTR = 9,
224 TX_FIFO_ALMOST_FULL_INTR = 10,
225 TX_FIFO_FULL_INTR = 11,
226 RX_EMPTY_INTR = 12,
227 RX_ALMOST_EMPTY_INTR = 13,
228 RX_ALMOST_FULL_INTR = 14,
229 RX_FULL_INTR = 15,
230 };
231 int command_intr_source(unsigned int channel)
232 {
233 if (command_channel_valid(channel) == 0)
234 channel = 1;
235 return channel + 1;
236 }
237
238 uint32_t intr_bit(int interrupt_source)
239 {
240 return 0x1 << interrupt_source;
241 }
242
243 uint32_t tx_clock_divisor_bits(unsigned int divisor)
244 {
245 return divisor & 0xff;
246 }
247
248 unsigned int fifo_size(uint32_t fifo_size_bits)
249 {
250 return fifo_size_bits & 0xfffff;
251 }
252
253 unsigned int fifo_words(uint32_t fifo_words_bits)
254 {
255 return fifo_words_bits & 0xfffff;
256 }
257
258 uint32_t intr_edge_bit(int interrupt_source)
259 {
260 return 0x1 << interrupt_source;
261 }
262
263 uint32_t intr_active_high_bit(int interrupt_source)
264 {
265 return 0x1 << interrupt_source;
266 }
267
268 struct hpdi_board {
269
270 char *name;
271 int device_id; /* pci device id */
272 int subdevice_id; /* pci subdevice id */
273 };
274
275 static const struct hpdi_board hpdi_boards[] = {
276 {
277 .name = "pci-hpdi32",
278 .device_id = PCI_DEVICE_ID_PLX_9080,
279 .subdevice_id = 0x2400,
280 },
281 #if 0
282 {
283 .name = "pxi-hpdi32",
284 .device_id = 0x9656,
285 .subdevice_id = 0x2705,
286 },
287 #endif
288 };
289
290 static DEFINE_PCI_DEVICE_TABLE(hpdi_pci_table) = {
291 {
292 PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9080, PCI_VENDOR_ID_PLX,
293 0x2400, 0, 0, 0}, {
294 0}
295 };
296
297 MODULE_DEVICE_TABLE(pci, hpdi_pci_table);
298
299 static inline struct hpdi_board *board(const struct comedi_device *dev)
300 {
301 return (struct hpdi_board *)dev->board_ptr;
302 }
303
304 struct hpdi_private {
305
306 struct pci_dev *hw_dev; /* pointer to board's pci_dev struct */
307 /* base addresses (physical) */
308 resource_size_t plx9080_phys_iobase;
309 resource_size_t hpdi_phys_iobase;
310 /* base addresses (ioremapped) */
311 void *plx9080_iobase;
312 void *hpdi_iobase;
313 uint32_t *dio_buffer[NUM_DMA_BUFFERS]; /* dma buffers */
314 /* physical addresses of dma buffers */
315 dma_addr_t dio_buffer_phys_addr[NUM_DMA_BUFFERS];
316 /* array of dma descriptors read by plx9080, allocated to get proper
317 * alignment */
318 struct plx_dma_desc *dma_desc;
319 /* physical address of dma descriptor array */
320 dma_addr_t dma_desc_phys_addr;
321 unsigned int num_dma_descriptors;
322 /* pointer to start of buffers indexed by descriptor */
323 uint32_t *desc_dio_buffer[NUM_DMA_DESCRIPTORS];
324 /* index of the dma descriptor that is currently being used */
325 volatile unsigned int dma_desc_index;
326 unsigned int tx_fifo_size;
327 unsigned int rx_fifo_size;
328 volatile unsigned long dio_count;
329 /* software copies of values written to hpdi registers */
330 volatile uint32_t bits[24];
331 /* number of bytes at which to generate COMEDI_CB_BLOCK events */
332 volatile unsigned int block_size;
333 unsigned dio_config_output:1;
334 };
335
336 static inline struct hpdi_private *priv(struct comedi_device *dev)
337 {
338 return dev->private;
339 }
340
341 static struct comedi_driver driver_hpdi = {
342 .driver_name = "gsc_hpdi",
343 .module = THIS_MODULE,
344 .attach = hpdi_attach,
345 .detach = hpdi_detach,
346 };
347
348 static int __devinit driver_hpdi_pci_probe(struct pci_dev *dev,
349 const struct pci_device_id *ent)
350 {
351 return comedi_pci_auto_config(dev, driver_hpdi.driver_name);
352 }
353
354 static void __devexit driver_hpdi_pci_remove(struct pci_dev *dev)
355 {
356 comedi_pci_auto_unconfig(dev);
357 }
358
359 static struct pci_driver driver_hpdi_pci_driver = {
360 .id_table = hpdi_pci_table,
361 .probe = &driver_hpdi_pci_probe,
362 .remove = __devexit_p(&driver_hpdi_pci_remove)
363 };
364
365 static int __init driver_hpdi_init_module(void)
366 {
367 int retval;
368
369 retval = comedi_driver_register(&driver_hpdi);
370 if (retval < 0)
371 return retval;
372
373 driver_hpdi_pci_driver.name = (char *)driver_hpdi.driver_name;
374 return pci_register_driver(&driver_hpdi_pci_driver);
375 }
376
377 static void __exit driver_hpdi_cleanup_module(void)
378 {
379 pci_unregister_driver(&driver_hpdi_pci_driver);
380 comedi_driver_unregister(&driver_hpdi);
381 }
382
383 module_init(driver_hpdi_init_module);
384 module_exit(driver_hpdi_cleanup_module);
385
386 static int dio_config_insn(struct comedi_device *dev,
387 struct comedi_subdevice *s, struct comedi_insn *insn,
388 unsigned int *data)
389 {
390 switch (data[0]) {
391 case INSN_CONFIG_DIO_OUTPUT:
392 priv(dev)->dio_config_output = 1;
393 return insn->n;
394 break;
395 case INSN_CONFIG_DIO_INPUT:
396 priv(dev)->dio_config_output = 0;
397 return insn->n;
398 break;
399 case INSN_CONFIG_DIO_QUERY:
400 data[1] =
401 priv(dev)->dio_config_output ? COMEDI_OUTPUT : COMEDI_INPUT;
402 return insn->n;
403 break;
404 case INSN_CONFIG_BLOCK_SIZE:
405 return dio_config_block_size(dev, data);
406 break;
407 default:
408 break;
409 }
410
411 return -EINVAL;
412 }
413
414 static void disable_plx_interrupts(struct comedi_device *dev)
415 {
416 writel(0, priv(dev)->plx9080_iobase + PLX_INTRCS_REG);
417 }
418
419 /* initialize plx9080 chip */
420 static void init_plx9080(struct comedi_device *dev)
421 {
422 uint32_t bits;
423 void *plx_iobase = priv(dev)->plx9080_iobase;
424
425 /* plx9080 dump */
426 DEBUG_PRINT(" plx interrupt status 0x%x\n",
427 readl(plx_iobase + PLX_INTRCS_REG));
428 DEBUG_PRINT(" plx id bits 0x%x\n", readl(plx_iobase + PLX_ID_REG));
429 DEBUG_PRINT(" plx control reg 0x%x\n",
430 readl(priv(dev)->plx9080_iobase + PLX_CONTROL_REG));
431
432 DEBUG_PRINT(" plx revision 0x%x\n",
433 readl(plx_iobase + PLX_REVISION_REG));
434 DEBUG_PRINT(" plx dma channel 0 mode 0x%x\n",
435 readl(plx_iobase + PLX_DMA0_MODE_REG));
436 DEBUG_PRINT(" plx dma channel 1 mode 0x%x\n",
437 readl(plx_iobase + PLX_DMA1_MODE_REG));
438 DEBUG_PRINT(" plx dma channel 0 pci address 0x%x\n",
439 readl(plx_iobase + PLX_DMA0_PCI_ADDRESS_REG));
440 DEBUG_PRINT(" plx dma channel 0 local address 0x%x\n",
441 readl(plx_iobase + PLX_DMA0_LOCAL_ADDRESS_REG));
442 DEBUG_PRINT(" plx dma channel 0 transfer size 0x%x\n",
443 readl(plx_iobase + PLX_DMA0_TRANSFER_SIZE_REG));
444 DEBUG_PRINT(" plx dma channel 0 descriptor 0x%x\n",
445 readl(plx_iobase + PLX_DMA0_DESCRIPTOR_REG));
446 DEBUG_PRINT(" plx dma channel 0 command status 0x%x\n",
447 readb(plx_iobase + PLX_DMA0_CS_REG));
448 DEBUG_PRINT(" plx dma channel 0 threshold 0x%x\n",
449 readl(plx_iobase + PLX_DMA0_THRESHOLD_REG));
450 DEBUG_PRINT(" plx bigend 0x%x\n", readl(plx_iobase + PLX_BIGEND_REG));
451 #ifdef __BIG_ENDIAN
452 bits = BIGEND_DMA0 | BIGEND_DMA1;
453 #else
454 bits = 0;
455 #endif
456 writel(bits, priv(dev)->plx9080_iobase + PLX_BIGEND_REG);
457
458 disable_plx_interrupts(dev);
459
460 abort_dma(dev, 0);
461 abort_dma(dev, 1);
462
463 /* configure dma0 mode */
464 bits = 0;
465 /* enable ready input */
466 bits |= PLX_DMA_EN_READYIN_BIT;
467 /* enable dma chaining */
468 bits |= PLX_EN_CHAIN_BIT;
469 /* enable interrupt on dma done
470 * (probably don't need this, since chain never finishes) */
471 bits |= PLX_EN_DMA_DONE_INTR_BIT;
472 /* don't increment local address during transfers
473 * (we are transferring from a fixed fifo register) */
474 bits |= PLX_LOCAL_ADDR_CONST_BIT;
475 /* route dma interrupt to pci bus */
476 bits |= PLX_DMA_INTR_PCI_BIT;
477 /* enable demand mode */
478 bits |= PLX_DEMAND_MODE_BIT;
479 /* enable local burst mode */
480 bits |= PLX_DMA_LOCAL_BURST_EN_BIT;
481 bits |= PLX_LOCAL_BUS_32_WIDE_BITS;
482 writel(bits, plx_iobase + PLX_DMA0_MODE_REG);
483 }
484
485 /* Allocate and initialize the subdevice structures.
486 */
487 static int setup_subdevices(struct comedi_device *dev)
488 {
489 struct comedi_subdevice *s;
490
491 if (alloc_subdevices(dev, 1) < 0)
492 return -ENOMEM;
493
494 s = dev->subdevices + 0;
495 /* analog input subdevice */
496 dev->read_subdev = s;
497 /* dev->write_subdev = s; */
498 s->type = COMEDI_SUBD_DIO;
499 s->subdev_flags =
500 SDF_READABLE | SDF_WRITEABLE | SDF_LSAMPL | SDF_CMD_READ;
501 s->n_chan = 32;
502 s->len_chanlist = 32;
503 s->maxdata = 1;
504 s->range_table = &range_digital;
505 s->insn_config = dio_config_insn;
506 s->do_cmd = hpdi_cmd;
507 s->do_cmdtest = hpdi_cmd_test;
508 s->cancel = hpdi_cancel;
509
510 return 0;
511 }
512
513 static int init_hpdi(struct comedi_device *dev)
514 {
515 uint32_t plx_intcsr_bits;
516
517 writel(BOARD_RESET_BIT, priv(dev)->hpdi_iobase + BOARD_CONTROL_REG);
518 udelay(10);
519
520 writel(almost_empty_bits(32) | almost_full_bits(32),
521 priv(dev)->hpdi_iobase + RX_PROG_ALMOST_REG);
522 writel(almost_empty_bits(32) | almost_full_bits(32),
523 priv(dev)->hpdi_iobase + TX_PROG_ALMOST_REG);
524
525 priv(dev)->tx_fifo_size = fifo_size(readl(priv(dev)->hpdi_iobase +
526 TX_FIFO_SIZE_REG));
527 priv(dev)->rx_fifo_size = fifo_size(readl(priv(dev)->hpdi_iobase +
528 RX_FIFO_SIZE_REG));
529
530 writel(0, priv(dev)->hpdi_iobase + INTERRUPT_CONTROL_REG);
531
532 /* enable interrupts */
533 plx_intcsr_bits =
534 ICS_AERR | ICS_PERR | ICS_PIE | ICS_PLIE | ICS_PAIE | ICS_LIE |
535 ICS_DMA0_E;
536 writel(plx_intcsr_bits, priv(dev)->plx9080_iobase + PLX_INTRCS_REG);
537
538 return 0;
539 }
540
541 /* setup dma descriptors so a link completes every 'transfer_size' bytes */
542 static int setup_dma_descriptors(struct comedi_device *dev,
543 unsigned int transfer_size)
544 {
545 unsigned int buffer_index, buffer_offset;
546 uint32_t next_bits = PLX_DESC_IN_PCI_BIT | PLX_INTR_TERM_COUNT |
547 PLX_XFER_LOCAL_TO_PCI;
548 unsigned int i;
549
550 if (transfer_size > DMA_BUFFER_SIZE)
551 transfer_size = DMA_BUFFER_SIZE;
552 transfer_size -= transfer_size % sizeof(uint32_t);
553 if (transfer_size == 0)
554 return -1;
555
556 DEBUG_PRINT(" transfer_size %i\n", transfer_size);
557 DEBUG_PRINT(" descriptors at 0x%lx\n",
558 (unsigned long)priv(dev)->dma_desc_phys_addr);
559
560 buffer_offset = 0;
561 buffer_index = 0;
562 for (i = 0; i < NUM_DMA_DESCRIPTORS &&
563 buffer_index < NUM_DMA_BUFFERS; i++) {
564 priv(dev)->dma_desc[i].pci_start_addr =
565 cpu_to_le32(priv(dev)->dio_buffer_phys_addr[buffer_index] +
566 buffer_offset);
567 priv(dev)->dma_desc[i].local_start_addr = cpu_to_le32(FIFO_REG);
568 priv(dev)->dma_desc[i].transfer_size =
569 cpu_to_le32(transfer_size);
570 priv(dev)->dma_desc[i].next =
571 cpu_to_le32((priv(dev)->dma_desc_phys_addr + (i +
572 1) *
573 sizeof(priv(dev)->dma_desc[0])) | next_bits);
574
575 priv(dev)->desc_dio_buffer[i] =
576 priv(dev)->dio_buffer[buffer_index] +
577 (buffer_offset / sizeof(uint32_t));
578
579 buffer_offset += transfer_size;
580 if (transfer_size + buffer_offset > DMA_BUFFER_SIZE) {
581 buffer_offset = 0;
582 buffer_index++;
583 }
584
585 DEBUG_PRINT(" desc %i\n", i);
586 DEBUG_PRINT(" start addr virt 0x%p, phys 0x%lx\n",
587 priv(dev)->desc_dio_buffer[i],
588 (unsigned long)priv(dev)->dma_desc[i].
589 pci_start_addr);
590 DEBUG_PRINT(" next 0x%lx\n",
591 (unsigned long)priv(dev)->dma_desc[i].next);
592 }
593 priv(dev)->num_dma_descriptors = i;
594 /* fix last descriptor to point back to first */
595 priv(dev)->dma_desc[i - 1].next =
596 cpu_to_le32(priv(dev)->dma_desc_phys_addr | next_bits);
597 DEBUG_PRINT(" desc %i next fixup 0x%lx\n", i - 1,
598 (unsigned long)priv(dev)->dma_desc[i - 1].next);
599
600 priv(dev)->block_size = transfer_size;
601
602 return transfer_size;
603 }
604
605 static int hpdi_attach(struct comedi_device *dev, struct comedi_devconfig *it)
606 {
607 struct pci_dev *pcidev;
608 int i;
609 int retval;
610
611 printk(KERN_WARNING "comedi%d: gsc_hpdi\n", dev->minor);
612
613 if (alloc_private(dev, sizeof(struct hpdi_private)) < 0)
614 return -ENOMEM;
615
616 pcidev = NULL;
617 for (i = 0; i < ARRAY_SIZE(hpdi_boards) &&
618 dev->board_ptr == NULL; i++) {
619 do {
620 pcidev = pci_get_subsys(PCI_VENDOR_ID_PLX,
621 hpdi_boards[i].device_id,
622 PCI_VENDOR_ID_PLX,
623 hpdi_boards[i].subdevice_id,
624 pcidev);
625 /* was a particular bus/slot requested? */
626 if (it->options[0] || it->options[1]) {
627 /* are we on the wrong bus/slot? */
628 if (pcidev->bus->number != it->options[0] ||
629 PCI_SLOT(pcidev->devfn) != it->options[1])
630 continue;
631 }
632 if (pcidev) {
633 priv(dev)->hw_dev = pcidev;
634 dev->board_ptr = hpdi_boards + i;
635 break;
636 }
637 } while (pcidev != NULL);
638 }
639 if (dev->board_ptr == NULL) {
640 printk(KERN_WARNING "gsc_hpdi: no hpdi card found\n");
641 return -EIO;
642 }
643
644 printk(KERN_WARNING
645 "gsc_hpdi: found %s on bus %i, slot %i\n", board(dev)->name,
646 pcidev->bus->number, PCI_SLOT(pcidev->devfn));
647
648 if (comedi_pci_enable(pcidev, driver_hpdi.driver_name)) {
649 printk(KERN_WARNING
650 " failed enable PCI device and request regions\n");
651 return -EIO;
652 }
653 pci_set_master(pcidev);
654
655 /* Initialize dev->board_name */
656 dev->board_name = board(dev)->name;
657
658 priv(dev)->plx9080_phys_iobase =
659 pci_resource_start(pcidev, PLX9080_BADDRINDEX);
660 priv(dev)->hpdi_phys_iobase =
661 pci_resource_start(pcidev, HPDI_BADDRINDEX);
662
663 /* remap, won't work with 2.0 kernels but who cares */
664 priv(dev)->plx9080_iobase = ioremap(priv(dev)->plx9080_phys_iobase,
665 pci_resource_len(pcidev,
666 PLX9080_BADDRINDEX));
667 priv(dev)->hpdi_iobase =
668 ioremap(priv(dev)->hpdi_phys_iobase,
669 pci_resource_len(pcidev, HPDI_BADDRINDEX));
670 if (!priv(dev)->plx9080_iobase || !priv(dev)->hpdi_iobase) {
671 printk(KERN_WARNING " failed to remap io memory\n");
672 return -ENOMEM;
673 }
674
675 DEBUG_PRINT(" plx9080 remapped to 0x%p\n", priv(dev)->plx9080_iobase);
676 DEBUG_PRINT(" hpdi remapped to 0x%p\n", priv(dev)->hpdi_iobase);
677
678 init_plx9080(dev);
679
680 /* get irq */
681 if (request_irq(pcidev->irq, handle_interrupt, IRQF_SHARED,
682 driver_hpdi.driver_name, dev)) {
683 printk(KERN_WARNING
684 " unable to allocate irq %u\n", pcidev->irq);
685 return -EINVAL;
686 }
687 dev->irq = pcidev->irq;
688
689 printk(KERN_WARNING " irq %u\n", dev->irq);
690
691 /* alocate pci dma buffers */
692 for (i = 0; i < NUM_DMA_BUFFERS; i++) {
693 priv(dev)->dio_buffer[i] =
694 pci_alloc_consistent(priv(dev)->hw_dev, DMA_BUFFER_SIZE,
695 &priv(dev)->dio_buffer_phys_addr[i]);
696 DEBUG_PRINT("dio_buffer at virt 0x%p, phys 0x%lx\n",
697 priv(dev)->dio_buffer[i],
698 (unsigned long)priv(dev)->dio_buffer_phys_addr[i]);
699 }
700 /* allocate dma descriptors */
701 priv(dev)->dma_desc = pci_alloc_consistent(priv(dev)->hw_dev,
702 sizeof(struct plx_dma_desc) *
703 NUM_DMA_DESCRIPTORS,
704 &priv(dev)->
705 dma_desc_phys_addr);
706 if (priv(dev)->dma_desc_phys_addr & 0xf) {
707 printk(KERN_WARNING
708 " dma descriptors not quad-word aligned (bug)\n");
709 return -EIO;
710 }
711
712 retval = setup_dma_descriptors(dev, 0x1000);
713 if (retval < 0)
714 return retval;
715
716 retval = setup_subdevices(dev);
717 if (retval < 0)
718 return retval;
719
720 return init_hpdi(dev);
721 }
722
723 static int hpdi_detach(struct comedi_device *dev)
724 {
725 unsigned int i;
726
727 printk(KERN_WARNING "comedi%d: gsc_hpdi: remove\n", dev->minor);
728
729 if (dev->irq)
730 free_irq(dev->irq, dev);
731 if ((priv(dev)) && (priv(dev)->hw_dev)) {
732 if (priv(dev)->plx9080_iobase) {
733 disable_plx_interrupts(dev);
734 iounmap((void *)priv(dev)->plx9080_iobase);
735 }
736 if (priv(dev)->hpdi_iobase)
737 iounmap((void *)priv(dev)->hpdi_iobase);
738 /* free pci dma buffers */
739 for (i = 0; i < NUM_DMA_BUFFERS; i++) {
740 if (priv(dev)->dio_buffer[i])
741 pci_free_consistent(priv(dev)->hw_dev,
742 DMA_BUFFER_SIZE,
743 priv(dev)->
744 dio_buffer[i],
745 priv
746 (dev)->dio_buffer_phys_addr
747 [i]);
748 }
749 /* free dma descriptors */
750 if (priv(dev)->dma_desc)
751 pci_free_consistent(priv(dev)->hw_dev,
752 sizeof(struct plx_dma_desc)
753 * NUM_DMA_DESCRIPTORS,
754 priv(dev)->dma_desc,
755 priv(dev)->
756 dma_desc_phys_addr);
757 if (priv(dev)->hpdi_phys_iobase)
758 comedi_pci_disable(priv(dev)->hw_dev);
759 pci_dev_put(priv(dev)->hw_dev);
760 }
761 return 0;
762 }
763
764 static int dio_config_block_size(struct comedi_device *dev, unsigned int *data)
765 {
766 unsigned int requested_block_size;
767 int retval;
768
769 requested_block_size = data[1];
770
771 retval = setup_dma_descriptors(dev, requested_block_size);
772 if (retval < 0)
773 return retval;
774
775 data[1] = retval;
776
777 return 2;
778 }
779
780 static int di_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
781 struct comedi_cmd *cmd)
782 {
783 int err = 0;
784 int tmp;
785 int i;
786
787 /* step 1: make sure trigger sources are trivially valid */
788
789 tmp = cmd->start_src;
790 cmd->start_src &= TRIG_NOW;
791 if (!cmd->start_src || tmp != cmd->start_src)
792 err++;
793
794 tmp = cmd->scan_begin_src;
795 cmd->scan_begin_src &= TRIG_EXT;
796 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
797 err++;
798
799 tmp = cmd->convert_src;
800 cmd->convert_src &= TRIG_NOW;
801 if (!cmd->convert_src || tmp != cmd->convert_src)
802 err++;
803
804 tmp = cmd->scan_end_src;
805 cmd->scan_end_src &= TRIG_COUNT;
806 if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
807 err++;
808
809 tmp = cmd->stop_src;
810 cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
811 if (!cmd->stop_src || tmp != cmd->stop_src)
812 err++;
813
814 if (err)
815 return 1;
816
817 /* step 2: make sure trigger sources are unique and mutually
818 * compatible */
819
820 /* uniqueness check */
821 if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE)
822 err++;
823
824 if (err)
825 return 2;
826
827 /* step 3: make sure arguments are trivially compatible */
828
829 if (!cmd->chanlist_len) {
830 cmd->chanlist_len = 32;
831 err++;
832 }
833 if (cmd->scan_end_arg != cmd->chanlist_len) {
834 cmd->scan_end_arg = cmd->chanlist_len;
835 err++;
836 }
837
838 switch (cmd->stop_src) {
839 case TRIG_COUNT:
840 if (!cmd->stop_arg) {
841 cmd->stop_arg = 1;
842 err++;
843 }
844 break;
845 case TRIG_NONE:
846 if (cmd->stop_arg != 0) {
847 cmd->stop_arg = 0;
848 err++;
849 }
850 break;
851 default:
852 break;
853 }
854
855 if (err)
856 return 3;
857
858 /* step 4: fix up any arguments */
859
860 if (err)
861 return 4;
862
863 if (!cmd->chanlist)
864 return 0;
865
866 for (i = 1; i < cmd->chanlist_len; i++) {
867 if (CR_CHAN(cmd->chanlist[i]) != i) {
868 /* XXX could support 8 or 16 channels */
869 comedi_error(dev,
870 "chanlist must be ch 0 to 31 in order");
871 err++;
872 break;
873 }
874 }
875
876 if (err)
877 return 5;
878
879 return 0;
880 }
881
882 static int hpdi_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
883 struct comedi_cmd *cmd)
884 {
885 if (priv(dev)->dio_config_output)
886 return -EINVAL;
887 else
888 return di_cmd_test(dev, s, cmd);
889 }
890
891 static inline void hpdi_writel(struct comedi_device *dev, uint32_t bits,
892 unsigned int offset)
893 {
894 writel(bits | priv(dev)->bits[offset / sizeof(uint32_t)],
895 priv(dev)->hpdi_iobase + offset);
896 }
897
898 static int di_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
899 {
900 uint32_t bits;
901 unsigned long flags;
902 struct comedi_async *async = s->async;
903 struct comedi_cmd *cmd = &async->cmd;
904
905 hpdi_writel(dev, RX_FIFO_RESET_BIT, BOARD_CONTROL_REG);
906
907 DEBUG_PRINT("hpdi: in di_cmd\n");
908
909 abort_dma(dev, 0);
910
911 priv(dev)->dma_desc_index = 0;
912
913 /* These register are supposedly unused during chained dma,
914 * but I have found that left over values from last operation
915 * occasionally cause problems with transfer of first dma
916 * block. Initializing them to zero seems to fix the problem. */
917 writel(0, priv(dev)->plx9080_iobase + PLX_DMA0_TRANSFER_SIZE_REG);
918 writel(0, priv(dev)->plx9080_iobase + PLX_DMA0_PCI_ADDRESS_REG);
919 writel(0, priv(dev)->plx9080_iobase + PLX_DMA0_LOCAL_ADDRESS_REG);
920 /* give location of first dma descriptor */
921 bits =
922 priv(dev)->dma_desc_phys_addr | PLX_DESC_IN_PCI_BIT |
923 PLX_INTR_TERM_COUNT | PLX_XFER_LOCAL_TO_PCI;
924 writel(bits, priv(dev)->plx9080_iobase + PLX_DMA0_DESCRIPTOR_REG);
925
926 /* spinlock for plx dma control/status reg */
927 spin_lock_irqsave(&dev->spinlock, flags);
928 /* enable dma transfer */
929 writeb(PLX_DMA_EN_BIT | PLX_DMA_START_BIT | PLX_CLEAR_DMA_INTR_BIT,
930 priv(dev)->plx9080_iobase + PLX_DMA0_CS_REG);
931 spin_unlock_irqrestore(&dev->spinlock, flags);
932
933 if (cmd->stop_src == TRIG_COUNT)
934 priv(dev)->dio_count = cmd->stop_arg;
935 else
936 priv(dev)->dio_count = 1;
937
938 /* clear over/under run status flags */
939 writel(RX_UNDERRUN_BIT | RX_OVERRUN_BIT,
940 priv(dev)->hpdi_iobase + BOARD_STATUS_REG);
941 /* enable interrupts */
942 writel(intr_bit(RX_FULL_INTR),
943 priv(dev)->hpdi_iobase + INTERRUPT_CONTROL_REG);
944
945 DEBUG_PRINT("hpdi: starting rx\n");
946 hpdi_writel(dev, RX_ENABLE_BIT, BOARD_CONTROL_REG);
947
948 return 0;
949 }
950
951 static int hpdi_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
952 {
953 if (priv(dev)->dio_config_output)
954 return -EINVAL;
955 else
956 return di_cmd(dev, s);
957 }
958
959 static void drain_dma_buffers(struct comedi_device *dev, unsigned int channel)
960 {
961 struct comedi_async *async = dev->read_subdev->async;
962 uint32_t next_transfer_addr;
963 int j;
964 int num_samples = 0;
965 void *pci_addr_reg;
966
967 if (channel)
968 pci_addr_reg =
969 priv(dev)->plx9080_iobase + PLX_DMA1_PCI_ADDRESS_REG;
970 else
971 pci_addr_reg =
972 priv(dev)->plx9080_iobase + PLX_DMA0_PCI_ADDRESS_REG;
973
974 /* loop until we have read all the full buffers */
975 j = 0;
976 for (next_transfer_addr = readl(pci_addr_reg);
977 (next_transfer_addr <
978 le32_to_cpu(priv(dev)->dma_desc[priv(dev)->dma_desc_index].
979 pci_start_addr)
980 || next_transfer_addr >=
981 le32_to_cpu(priv(dev)->dma_desc[priv(dev)->dma_desc_index].
982 pci_start_addr) + priv(dev)->block_size)
983 && j < priv(dev)->num_dma_descriptors; j++) {
984 /* transfer data from dma buffer to comedi buffer */
985 num_samples = priv(dev)->block_size / sizeof(uint32_t);
986 if (async->cmd.stop_src == TRIG_COUNT) {
987 if (num_samples > priv(dev)->dio_count)
988 num_samples = priv(dev)->dio_count;
989 priv(dev)->dio_count -= num_samples;
990 }
991 cfc_write_array_to_buffer(dev->read_subdev,
992 priv(dev)->desc_dio_buffer[priv(dev)->
993 dma_desc_index],
994 num_samples * sizeof(uint32_t));
995 priv(dev)->dma_desc_index++;
996 priv(dev)->dma_desc_index %= priv(dev)->num_dma_descriptors;
997
998 DEBUG_PRINT("next desc addr 0x%lx\n", (unsigned long)
999 priv(dev)->dma_desc[priv(dev)->dma_desc_index].
1000 next);
1001 DEBUG_PRINT("pci addr reg 0x%x\n", next_transfer_addr);
1002 }
1003 /* XXX check for buffer overrun somehow */
1004 }
1005
1006 static irqreturn_t handle_interrupt(int irq, void *d)
1007 {
1008 struct comedi_device *dev = d;
1009 struct comedi_subdevice *s = dev->read_subdev;
1010 struct comedi_async *async = s->async;
1011 uint32_t hpdi_intr_status, hpdi_board_status;
1012 uint32_t plx_status;
1013 uint32_t plx_bits;
1014 uint8_t dma0_status, dma1_status;
1015 unsigned long flags;
1016
1017 if (!dev->attached)
1018 return IRQ_NONE;
1019
1020 plx_status = readl(priv(dev)->plx9080_iobase + PLX_INTRCS_REG);
1021 if ((plx_status & (ICS_DMA0_A | ICS_DMA1_A | ICS_LIA)) == 0)
1022 return IRQ_NONE;
1023
1024 hpdi_intr_status = readl(priv(dev)->hpdi_iobase + INTERRUPT_STATUS_REG);
1025 hpdi_board_status = readl(priv(dev)->hpdi_iobase + BOARD_STATUS_REG);
1026
1027 async->events = 0;
1028
1029 if (hpdi_intr_status) {
1030 DEBUG_PRINT("hpdi: intr status 0x%x, ", hpdi_intr_status);
1031 writel(hpdi_intr_status,
1032 priv(dev)->hpdi_iobase + INTERRUPT_STATUS_REG);
1033 }
1034 /* spin lock makes sure noone else changes plx dma control reg */
1035 spin_lock_irqsave(&dev->spinlock, flags);
1036 dma0_status = readb(priv(dev)->plx9080_iobase + PLX_DMA0_CS_REG);
1037 if (plx_status & ICS_DMA0_A) { /* dma chan 0 interrupt */
1038 writeb((dma0_status & PLX_DMA_EN_BIT) | PLX_CLEAR_DMA_INTR_BIT,
1039 priv(dev)->plx9080_iobase + PLX_DMA0_CS_REG);
1040
1041 DEBUG_PRINT("dma0 status 0x%x\n", dma0_status);
1042 if (dma0_status & PLX_DMA_EN_BIT)
1043 drain_dma_buffers(dev, 0);
1044 DEBUG_PRINT(" cleared dma ch0 interrupt\n");
1045 }
1046 spin_unlock_irqrestore(&dev->spinlock, flags);
1047
1048 /* spin lock makes sure noone else changes plx dma control reg */
1049 spin_lock_irqsave(&dev->spinlock, flags);
1050 dma1_status = readb(priv(dev)->plx9080_iobase + PLX_DMA1_CS_REG);
1051 if (plx_status & ICS_DMA1_A) { /* XXX *//* dma chan 1 interrupt */
1052 writeb((dma1_status & PLX_DMA_EN_BIT) | PLX_CLEAR_DMA_INTR_BIT,
1053 priv(dev)->plx9080_iobase + PLX_DMA1_CS_REG);
1054 DEBUG_PRINT("dma1 status 0x%x\n", dma1_status);
1055
1056 DEBUG_PRINT(" cleared dma ch1 interrupt\n");
1057 }
1058 spin_unlock_irqrestore(&dev->spinlock, flags);
1059
1060 /* clear possible plx9080 interrupt sources */
1061 if (plx_status & ICS_LDIA) { /* clear local doorbell interrupt */
1062 plx_bits = readl(priv(dev)->plx9080_iobase + PLX_DBR_OUT_REG);
1063 writel(plx_bits, priv(dev)->plx9080_iobase + PLX_DBR_OUT_REG);
1064 DEBUG_PRINT(" cleared local doorbell bits 0x%x\n", plx_bits);
1065 }
1066
1067 if (hpdi_board_status & RX_OVERRUN_BIT) {
1068 comedi_error(dev, "rx fifo overrun");
1069 async->events |= COMEDI_CB_EOA | COMEDI_CB_ERROR;
1070 DEBUG_PRINT("dma0_status 0x%x\n",
1071 (int)readb(priv(dev)->plx9080_iobase +
1072 PLX_DMA0_CS_REG));
1073 }
1074
1075 if (hpdi_board_status & RX_UNDERRUN_BIT) {
1076 comedi_error(dev, "rx fifo underrun");
1077 async->events |= COMEDI_CB_EOA | COMEDI_CB_ERROR;
1078 }
1079
1080 if (priv(dev)->dio_count == 0)
1081 async->events |= COMEDI_CB_EOA;
1082
1083 DEBUG_PRINT("board status 0x%x, ", hpdi_board_status);
1084 DEBUG_PRINT("plx status 0x%x\n", plx_status);
1085 if (async->events)
1086 DEBUG_PRINT(" events 0x%x\n", async->events);
1087
1088 cfc_handle_events(dev, s);
1089
1090 return IRQ_HANDLED;
1091 }
1092
1093 static void abort_dma(struct comedi_device *dev, unsigned int channel)
1094 {
1095 unsigned long flags;
1096
1097 /* spinlock for plx dma control/status reg */
1098 spin_lock_irqsave(&dev->spinlock, flags);
1099
1100 plx9080_abort_dma(priv(dev)->plx9080_iobase, channel);
1101
1102 spin_unlock_irqrestore(&dev->spinlock, flags);
1103 }
1104
1105 static int hpdi_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
1106 {
1107 hpdi_writel(dev, 0, BOARD_CONTROL_REG);
1108
1109 writel(0, priv(dev)->hpdi_iobase + INTERRUPT_CONTROL_REG);
1110
1111 abort_dma(dev, 0);
1112
1113 return 0;
1114 }
1115
1116 MODULE_AUTHOR("Comedi http://www.comedi.org");
1117 MODULE_DESCRIPTION("Comedi low-level driver");
1118 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)