2 comedi/drivers/gsc_hpdi.c
3 This is a driver for the General Standards Corporation High
4 Speed Parallel Digital Interface rs485 boards.
6 Author: Frank Mori Hess <fmhess@users.sourceforge.net>
7 Copyright (C) 2003 Coherent Imaging Systems
9 COMEDI - Linux Control and Measurement Device Interface
10 Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
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.
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.
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.
26 ************************************************************************/
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
36 Devices: [General Standards Corporation] PCI-HPDI32 (gsc_hpdi),
39 Configuration options:
40 [0] - PCI bus of device (optional)
41 [1] - PCI slot of device (optional)
43 There are some additional hpdi models available from GSC for which
44 support could be added to this driver.
48 #include "../comedidev.h"
49 #include <linux/delay.h>
51 #include "comedi_pci.h"
53 #include "comedi_fc.h"
55 static int hpdi_attach(struct comedi_device
* dev
, comedi_devconfig
* it
);
56 static int hpdi_detach(struct comedi_device
* dev
);
57 void abort_dma(struct comedi_device
* dev
, unsigned int channel
);
58 static int hpdi_cmd(struct comedi_device
* dev
, struct comedi_subdevice
* s
);
59 static int hpdi_cmd_test(struct comedi_device
* dev
, struct comedi_subdevice
* s
,
60 struct comedi_cmd
* cmd
);
61 static int hpdi_cancel(struct comedi_device
* dev
, struct comedi_subdevice
* s
);
62 static irqreturn_t
handle_interrupt(int irq
, void *d PT_REGS_ARG
);
63 static int dio_config_block_size(struct comedi_device
* dev
, unsigned int * data
);
65 #undef HPDI_DEBUG // disable debugging messages
66 //#define HPDI_DEBUG // enable debugging code
69 #define DEBUG_PRINT(format, args...) rt_printk(format , ## args )
71 #define DEBUG_PRINT(format, args...)
74 #define TIMER_BASE 50 // 20MHz master clock
75 #define DMA_BUFFER_SIZE 0x10000
76 #define NUM_DMA_BUFFERS 4
77 #define NUM_DMA_DESCRIPTORS 256
79 // indices of base address regions
80 enum base_address_regions
{
81 PLX9080_BADDRINDEX
= 0,
86 FIRMWARE_REV_REG
= 0x0,
87 BOARD_CONTROL_REG
= 0x4,
88 BOARD_STATUS_REG
= 0x8,
89 TX_PROG_ALMOST_REG
= 0xc,
90 RX_PROG_ALMOST_REG
= 0x10,
93 TX_STATUS_COUNT_REG
= 0x1c,
94 TX_LINE_VALID_COUNT_REG
= 0x20,
95 TX_LINE_INVALID_COUNT_REG
= 0x24,
96 RX_STATUS_COUNT_REG
= 0x28,
97 RX_LINE_COUNT_REG
= 0x2c,
98 INTERRUPT_CONTROL_REG
= 0x30,
99 INTERRUPT_STATUS_REG
= 0x34,
100 TX_CLOCK_DIVIDER_REG
= 0x38,
101 TX_FIFO_SIZE_REG
= 0x40,
102 RX_FIFO_SIZE_REG
= 0x44,
103 TX_FIFO_WORDS_REG
= 0x48,
104 RX_FIFO_WORDS_REG
= 0x4c,
105 INTERRUPT_EDGE_LEVEL_REG
= 0x50,
106 INTERRUPT_POLARITY_REG
= 0x54,
109 int command_channel_valid(unsigned int channel
)
111 if (channel
== 0 || channel
> 6) {
112 rt_printk("gsc_hpdi: bug! invalid cable command channel\n");
120 enum firmware_revision_bits
{
121 FEATURES_REG_PRESENT_BIT
= 0x8000,
123 int firmware_revision(uint32_t fwr_bits
)
125 return fwr_bits
& 0xff;
128 int pcb_revision(uint32_t fwr_bits
)
130 return (fwr_bits
>> 8) & 0xff;
133 int hpdi_subid(uint32_t fwr_bits
)
135 return (fwr_bits
>> 16) & 0xff;
138 enum board_control_bits
{
139 BOARD_RESET_BIT
= 0x1, /* wait 10usec before accessing fifos */
140 TX_FIFO_RESET_BIT
= 0x2,
141 RX_FIFO_RESET_BIT
= 0x4,
142 TX_ENABLE_BIT
= 0x10,
143 RX_ENABLE_BIT
= 0x20,
144 DEMAND_DMA_DIRECTION_TX_BIT
= 0x40, /* for channel 0, channel 1 can only transmit (when present) */
145 LINE_VALID_ON_STATUS_VALID_BIT
= 0x80,
147 CABLE_THROTTLE_ENABLE_BIT
= 0x20,
148 TEST_MODE_ENABLE_BIT
= 0x80000000,
150 uint32_t command_discrete_output_bits(unsigned int channel
, int output
,
155 if (command_channel_valid(channel
) == 0)
158 bits
|= 0x1 << (16 + channel
);
160 bits
|= 0x1 << (24 + channel
);
162 bits
|= 0x1 << (24 + channel
);
167 enum board_status_bits
{
168 COMMAND_LINE_STATUS_MASK
= 0x7f,
169 TX_IN_PROGRESS_BIT
= 0x80,
170 TX_NOT_EMPTY_BIT
= 0x100,
171 TX_NOT_ALMOST_EMPTY_BIT
= 0x200,
172 TX_NOT_ALMOST_FULL_BIT
= 0x400,
173 TX_NOT_FULL_BIT
= 0x800,
174 RX_NOT_EMPTY_BIT
= 0x1000,
175 RX_NOT_ALMOST_EMPTY_BIT
= 0x2000,
176 RX_NOT_ALMOST_FULL_BIT
= 0x4000,
177 RX_NOT_FULL_BIT
= 0x8000,
178 BOARD_JUMPER0_INSTALLED_BIT
= 0x10000,
179 BOARD_JUMPER1_INSTALLED_BIT
= 0x20000,
180 TX_OVERRUN_BIT
= 0x200000,
181 RX_UNDERRUN_BIT
= 0x400000,
182 RX_OVERRUN_BIT
= 0x800000,
185 uint32_t almost_full_bits(unsigned int num_words
)
187 // XXX need to add or subtract one?
188 return (num_words
<< 16) & 0xff0000;
191 uint32_t almost_empty_bits(unsigned int num_words
)
193 return num_words
& 0xffff;
195 unsigned int almost_full_num_words(uint32_t bits
)
197 // XXX need to add or subtract one?
198 return (bits
>> 16) & 0xffff;
200 unsigned int almost_empty_num_words(uint32_t bits
)
202 return bits
& 0xffff;
206 FIFO_SIZE_PRESENT_BIT
= 0x1,
207 FIFO_WORDS_PRESENT_BIT
= 0x2,
208 LEVEL_EDGE_INTERRUPTS_PRESENT_BIT
= 0x4,
209 GPIO_SUPPORTED_BIT
= 0x8,
210 PLX_DMA_CH1_SUPPORTED_BIT
= 0x10,
211 OVERRUN_UNDERRUN_SUPPORTED_BIT
= 0x20,
214 enum interrupt_sources
{
215 FRAME_VALID_START_INTR
= 0,
216 FRAME_VALID_END_INTR
= 1,
217 TX_FIFO_EMPTY_INTR
= 8,
218 TX_FIFO_ALMOST_EMPTY_INTR
= 9,
219 TX_FIFO_ALMOST_FULL_INTR
= 10,
220 TX_FIFO_FULL_INTR
= 11,
222 RX_ALMOST_EMPTY_INTR
= 13,
223 RX_ALMOST_FULL_INTR
= 14,
226 int command_intr_source(unsigned int channel
)
228 if (command_channel_valid(channel
) == 0)
233 uint32_t intr_bit(int interrupt_source
)
235 return 0x1 << interrupt_source
;
238 uint32_t tx_clock_divisor_bits(unsigned int divisor
)
240 return divisor
& 0xff;
243 unsigned int fifo_size(uint32_t fifo_size_bits
)
245 return fifo_size_bits
& 0xfffff;
248 unsigned int fifo_words(uint32_t fifo_words_bits
)
250 return fifo_words_bits
& 0xfffff;
253 uint32_t intr_edge_bit(int interrupt_source
)
255 return 0x1 << interrupt_source
;
258 uint32_t intr_active_high_bit(int interrupt_source
)
260 return 0x1 << interrupt_source
;
265 int device_id
; // pci device id
266 int subdevice_id
; // pci subdevice id
269 static const hpdi_board hpdi_boards
[] = {
272 device_id
:PCI_DEVICE_ID_PLX_9080
,
284 static inline unsigned int num_boards(void)
286 return sizeof(hpdi_boards
) / sizeof(hpdi_board
);
289 static DEFINE_PCI_DEVICE_TABLE(hpdi_pci_table
) = {
290 {PCI_VENDOR_ID_PLX
, PCI_DEVICE_ID_PLX_9080
, PCI_VENDOR_ID_PLX
, 0x2400,
295 MODULE_DEVICE_TABLE(pci
, hpdi_pci_table
);
297 static inline hpdi_board
*board(const struct comedi_device
* dev
)
299 return (hpdi_board
*) dev
->board_ptr
;
303 struct pci_dev
*hw_dev
; // pointer to board's pci_dev struct
304 // base addresses (physical)
305 resource_size_t plx9080_phys_iobase
;
306 resource_size_t hpdi_phys_iobase
;
307 // base addresses (ioremapped)
308 void *plx9080_iobase
;
310 uint32_t *dio_buffer
[NUM_DMA_BUFFERS
]; // dma buffers
311 dma_addr_t dio_buffer_phys_addr
[NUM_DMA_BUFFERS
]; // physical addresses of dma buffers
312 struct plx_dma_desc
*dma_desc
; // array of dma descriptors read by plx9080, allocated to get proper alignment
313 dma_addr_t dma_desc_phys_addr
; // physical address of dma descriptor array
314 unsigned int num_dma_descriptors
;
315 uint32_t *desc_dio_buffer
[NUM_DMA_DESCRIPTORS
]; // pointer to start of buffers indexed by descriptor
316 volatile unsigned int dma_desc_index
; // index of the dma descriptor that is currently being used
317 unsigned int tx_fifo_size
;
318 unsigned int rx_fifo_size
;
319 volatile unsigned long dio_count
;
320 volatile uint32_t bits
[24]; // software copies of values written to hpdi registers
321 volatile unsigned int block_size
; // number of bytes at which to generate COMEDI_CB_BLOCK events
322 unsigned dio_config_output
:1;
325 static inline hpdi_private
*priv(struct comedi_device
* dev
)
330 static struct comedi_driver driver_hpdi
= {
331 driver_name
:"gsc_hpdi",
337 COMEDI_PCI_INITCLEANUP(driver_hpdi
, hpdi_pci_table
);
339 static int dio_config_insn(struct comedi_device
* dev
, struct comedi_subdevice
* s
,
340 struct comedi_insn
* insn
, unsigned int * data
)
343 case INSN_CONFIG_DIO_OUTPUT
:
344 priv(dev
)->dio_config_output
= 1;
347 case INSN_CONFIG_DIO_INPUT
:
348 priv(dev
)->dio_config_output
= 0;
351 case INSN_CONFIG_DIO_QUERY
:
354 dio_config_output
? COMEDI_OUTPUT
: COMEDI_INPUT
;
357 case INSN_CONFIG_BLOCK_SIZE
:
358 return dio_config_block_size(dev
, data
);
367 static void disable_plx_interrupts(struct comedi_device
* dev
)
369 writel(0, priv(dev
)->plx9080_iobase
+ PLX_INTRCS_REG
);
372 // initialize plx9080 chip
373 static void init_plx9080(struct comedi_device
* dev
)
376 void *plx_iobase
= priv(dev
)->plx9080_iobase
;
379 DEBUG_PRINT(" plx interrupt status 0x%x\n",
380 readl(plx_iobase
+ PLX_INTRCS_REG
));
381 DEBUG_PRINT(" plx id bits 0x%x\n", readl(plx_iobase
+ PLX_ID_REG
));
382 DEBUG_PRINT(" plx control reg 0x%x\n",
383 readl(priv(dev
)->plx9080_iobase
+ PLX_CONTROL_REG
));
385 DEBUG_PRINT(" plx revision 0x%x\n",
386 readl(plx_iobase
+ PLX_REVISION_REG
));
387 DEBUG_PRINT(" plx dma channel 0 mode 0x%x\n",
388 readl(plx_iobase
+ PLX_DMA0_MODE_REG
));
389 DEBUG_PRINT(" plx dma channel 1 mode 0x%x\n",
390 readl(plx_iobase
+ PLX_DMA1_MODE_REG
));
391 DEBUG_PRINT(" plx dma channel 0 pci address 0x%x\n",
392 readl(plx_iobase
+ PLX_DMA0_PCI_ADDRESS_REG
));
393 DEBUG_PRINT(" plx dma channel 0 local address 0x%x\n",
394 readl(plx_iobase
+ PLX_DMA0_LOCAL_ADDRESS_REG
));
395 DEBUG_PRINT(" plx dma channel 0 transfer size 0x%x\n",
396 readl(plx_iobase
+ PLX_DMA0_TRANSFER_SIZE_REG
));
397 DEBUG_PRINT(" plx dma channel 0 descriptor 0x%x\n",
398 readl(plx_iobase
+ PLX_DMA0_DESCRIPTOR_REG
));
399 DEBUG_PRINT(" plx dma channel 0 command status 0x%x\n",
400 readb(plx_iobase
+ PLX_DMA0_CS_REG
));
401 DEBUG_PRINT(" plx dma channel 0 threshold 0x%x\n",
402 readl(plx_iobase
+ PLX_DMA0_THRESHOLD_REG
));
403 DEBUG_PRINT(" plx bigend 0x%x\n", readl(plx_iobase
+ PLX_BIGEND_REG
));
405 bits
= BIGEND_DMA0
| BIGEND_DMA1
;
409 writel(bits
, priv(dev
)->plx9080_iobase
+ PLX_BIGEND_REG
);
411 disable_plx_interrupts(dev
);
416 // configure dma0 mode
418 // enable ready input
419 bits
|= PLX_DMA_EN_READYIN_BIT
;
420 // enable dma chaining
421 bits
|= PLX_EN_CHAIN_BIT
;
422 // enable interrupt on dma done (probably don't need this, since chain never finishes)
423 bits
|= PLX_EN_DMA_DONE_INTR_BIT
;
424 // don't increment local address during transfers (we are transferring from a fixed fifo register)
425 bits
|= PLX_LOCAL_ADDR_CONST_BIT
;
426 // route dma interrupt to pci bus
427 bits
|= PLX_DMA_INTR_PCI_BIT
;
428 // enable demand mode
429 bits
|= PLX_DEMAND_MODE_BIT
;
430 // enable local burst mode
431 bits
|= PLX_DMA_LOCAL_BURST_EN_BIT
;
432 bits
|= PLX_LOCAL_BUS_32_WIDE_BITS
;
433 writel(bits
, plx_iobase
+ PLX_DMA0_MODE_REG
);
436 /* Allocate and initialize the subdevice structures.
438 static int setup_subdevices(struct comedi_device
* dev
)
440 struct comedi_subdevice
*s
;
442 if (alloc_subdevices(dev
, 1) < 0)
445 s
= dev
->subdevices
+ 0;
446 /* analog input subdevice */
447 dev
->read_subdev
= s
;
448 /* dev->write_subdev = s; */
449 s
->type
= COMEDI_SUBD_DIO
;
451 SDF_READABLE
| SDF_WRITEABLE
| SDF_LSAMPL
| SDF_CMD_READ
;
453 s
->len_chanlist
= 32;
455 s
->range_table
= &range_digital
;
456 s
->insn_config
= dio_config_insn
;
457 s
->do_cmd
= hpdi_cmd
;
458 s
->do_cmdtest
= hpdi_cmd_test
;
459 s
->cancel
= hpdi_cancel
;
464 static int init_hpdi(struct comedi_device
* dev
)
466 uint32_t plx_intcsr_bits
;
468 writel(BOARD_RESET_BIT
, priv(dev
)->hpdi_iobase
+ BOARD_CONTROL_REG
);
471 writel(almost_empty_bits(32) | almost_full_bits(32),
472 priv(dev
)->hpdi_iobase
+ RX_PROG_ALMOST_REG
);
473 writel(almost_empty_bits(32) | almost_full_bits(32),
474 priv(dev
)->hpdi_iobase
+ TX_PROG_ALMOST_REG
);
476 priv(dev
)->tx_fifo_size
= fifo_size(readl(priv(dev
)->hpdi_iobase
+
478 priv(dev
)->rx_fifo_size
= fifo_size(readl(priv(dev
)->hpdi_iobase
+
481 writel(0, priv(dev
)->hpdi_iobase
+ INTERRUPT_CONTROL_REG
);
485 ICS_AERR
| ICS_PERR
| ICS_PIE
| ICS_PLIE
| ICS_PAIE
| ICS_LIE
|
487 writel(plx_intcsr_bits
, priv(dev
)->plx9080_iobase
+ PLX_INTRCS_REG
);
492 // setup dma descriptors so a link completes every 'transfer_size' bytes
493 static int setup_dma_descriptors(struct comedi_device
* dev
,
494 unsigned int transfer_size
)
496 unsigned int buffer_index
, buffer_offset
;
497 uint32_t next_bits
= PLX_DESC_IN_PCI_BIT
| PLX_INTR_TERM_COUNT
|
498 PLX_XFER_LOCAL_TO_PCI
;
501 if (transfer_size
> DMA_BUFFER_SIZE
)
502 transfer_size
= DMA_BUFFER_SIZE
;
503 transfer_size
-= transfer_size
% sizeof(uint32_t);
504 if (transfer_size
== 0)
507 DEBUG_PRINT(" transfer_size %i\n", transfer_size
);
508 DEBUG_PRINT(" descriptors at 0x%lx\n",
509 (unsigned long)priv(dev
)->dma_desc_phys_addr
);
513 for (i
= 0; i
< NUM_DMA_DESCRIPTORS
&&
514 buffer_index
< NUM_DMA_BUFFERS
; i
++) {
515 priv(dev
)->dma_desc
[i
].pci_start_addr
=
516 cpu_to_le32(priv(dev
)->
517 dio_buffer_phys_addr
[buffer_index
] + buffer_offset
);
518 priv(dev
)->dma_desc
[i
].local_start_addr
= cpu_to_le32(FIFO_REG
);
519 priv(dev
)->dma_desc
[i
].transfer_size
=
520 cpu_to_le32(transfer_size
);
521 priv(dev
)->dma_desc
[i
].next
=
522 cpu_to_le32((priv(dev
)->dma_desc_phys_addr
+ (i
+
524 sizeof(priv(dev
)->dma_desc
[0])) | next_bits
);
526 priv(dev
)->desc_dio_buffer
[i
] =
527 priv(dev
)->dio_buffer
[buffer_index
] +
528 (buffer_offset
/ sizeof(uint32_t));
530 buffer_offset
+= transfer_size
;
531 if (transfer_size
+ buffer_offset
> DMA_BUFFER_SIZE
) {
536 DEBUG_PRINT(" desc %i\n", i
);
537 DEBUG_PRINT(" start addr virt 0x%p, phys 0x%lx\n",
538 priv(dev
)->desc_dio_buffer
[i
],
539 (unsigned long)priv(dev
)->dma_desc
[i
].pci_start_addr
);
540 DEBUG_PRINT(" next 0x%lx\n",
541 (unsigned long)priv(dev
)->dma_desc
[i
].next
);
543 priv(dev
)->num_dma_descriptors
= i
;
544 // fix last descriptor to point back to first
545 priv(dev
)->dma_desc
[i
- 1].next
=
546 cpu_to_le32(priv(dev
)->dma_desc_phys_addr
| next_bits
);
547 DEBUG_PRINT(" desc %i next fixup 0x%lx\n", i
- 1,
548 (unsigned long)priv(dev
)->dma_desc
[i
- 1].next
);
550 priv(dev
)->block_size
= transfer_size
;
552 return transfer_size
;
555 static int hpdi_attach(struct comedi_device
* dev
, comedi_devconfig
* it
)
557 struct pci_dev
*pcidev
;
561 printk("comedi%d: gsc_hpdi\n", dev
->minor
);
563 if (alloc_private(dev
, sizeof(hpdi_private
)) < 0)
567 for (i
= 0; i
< num_boards() && dev
->board_ptr
== NULL
; i
++) {
569 pcidev
= pci_get_subsys(PCI_VENDOR_ID_PLX
,
570 hpdi_boards
[i
].device_id
, PCI_VENDOR_ID_PLX
,
571 hpdi_boards
[i
].subdevice_id
, pcidev
);
572 // was a particular bus/slot requested?
573 if (it
->options
[0] || it
->options
[1]) {
574 // are we on the wrong bus/slot?
575 if (pcidev
->bus
->number
!= it
->options
[0] ||
576 PCI_SLOT(pcidev
->devfn
) !=
581 priv(dev
)->hw_dev
= pcidev
;
582 dev
->board_ptr
= hpdi_boards
+ i
;
585 } while (pcidev
!= NULL
);
587 if (dev
->board_ptr
== NULL
) {
588 printk("gsc_hpdi: no hpdi card found\n");
592 printk("gsc_hpdi: found %s on bus %i, slot %i\n", board(dev
)->name
,
593 pcidev
->bus
->number
, PCI_SLOT(pcidev
->devfn
));
595 if (comedi_pci_enable(pcidev
, driver_hpdi
.driver_name
)) {
597 " failed enable PCI device and request regions\n");
600 pci_set_master(pcidev
);
602 //Initialize dev->board_name
603 dev
->board_name
= board(dev
)->name
;
605 priv(dev
)->plx9080_phys_iobase
=
606 pci_resource_start(pcidev
, PLX9080_BADDRINDEX
);
607 priv(dev
)->hpdi_phys_iobase
=
608 pci_resource_start(pcidev
, HPDI_BADDRINDEX
);
610 // remap, won't work with 2.0 kernels but who cares
611 priv(dev
)->plx9080_iobase
= ioremap(priv(dev
)->plx9080_phys_iobase
,
612 pci_resource_len(pcidev
, PLX9080_BADDRINDEX
));
613 priv(dev
)->hpdi_iobase
= ioremap(priv(dev
)->hpdi_phys_iobase
,
614 pci_resource_len(pcidev
, HPDI_BADDRINDEX
));
615 if (!priv(dev
)->plx9080_iobase
|| !priv(dev
)->hpdi_iobase
) {
616 printk(" failed to remap io memory\n");
620 DEBUG_PRINT(" plx9080 remapped to 0x%p\n", priv(dev
)->plx9080_iobase
);
621 DEBUG_PRINT(" hpdi remapped to 0x%p\n", priv(dev
)->hpdi_iobase
);
626 if (comedi_request_irq(pcidev
->irq
, handle_interrupt
, IRQF_SHARED
,
627 driver_hpdi
.driver_name
, dev
)) {
628 printk(" unable to allocate irq %u\n", pcidev
->irq
);
631 dev
->irq
= pcidev
->irq
;
633 printk(" irq %u\n", dev
->irq
);
635 // alocate pci dma buffers
636 for (i
= 0; i
< NUM_DMA_BUFFERS
; i
++) {
637 priv(dev
)->dio_buffer
[i
] =
638 pci_alloc_consistent(priv(dev
)->hw_dev
, DMA_BUFFER_SIZE
,
639 &priv(dev
)->dio_buffer_phys_addr
[i
]);
640 DEBUG_PRINT("dio_buffer at virt 0x%p, phys 0x%lx\n",
641 priv(dev
)->dio_buffer
[i
],
642 (unsigned long)priv(dev
)->dio_buffer_phys_addr
[i
]);
644 // allocate dma descriptors
645 priv(dev
)->dma_desc
= pci_alloc_consistent(priv(dev
)->hw_dev
,
646 sizeof(struct plx_dma_desc
) * NUM_DMA_DESCRIPTORS
,
647 &priv(dev
)->dma_desc_phys_addr
);
648 if (priv(dev
)->dma_desc_phys_addr
& 0xf) {
649 printk(" dma descriptors not quad-word aligned (bug)\n");
653 retval
= setup_dma_descriptors(dev
, 0x1000);
657 retval
= setup_subdevices(dev
);
661 return init_hpdi(dev
);
664 static int hpdi_detach(struct comedi_device
* dev
)
668 printk("comedi%d: gsc_hpdi: remove\n", dev
->minor
);
671 comedi_free_irq(dev
->irq
, dev
);
673 if (priv(dev
)->hw_dev
) {
674 if (priv(dev
)->plx9080_iobase
) {
675 disable_plx_interrupts(dev
);
676 iounmap((void *)priv(dev
)->plx9080_iobase
);
678 if (priv(dev
)->hpdi_iobase
)
679 iounmap((void *)priv(dev
)->hpdi_iobase
);
680 // free pci dma buffers
681 for (i
= 0; i
< NUM_DMA_BUFFERS
; i
++) {
682 if (priv(dev
)->dio_buffer
[i
])
683 pci_free_consistent(priv(dev
)->hw_dev
,
685 priv(dev
)->dio_buffer
[i
],
687 dio_buffer_phys_addr
[i
]);
689 // free dma descriptors
690 if (priv(dev
)->dma_desc
)
691 pci_free_consistent(priv(dev
)->hw_dev
,
692 sizeof(struct plx_dma_desc
) *
695 priv(dev
)->dma_desc_phys_addr
);
696 if (priv(dev
)->hpdi_phys_iobase
) {
697 comedi_pci_disable(priv(dev
)->hw_dev
);
699 pci_dev_put(priv(dev
)->hw_dev
);
705 static int dio_config_block_size(struct comedi_device
* dev
, unsigned int * data
)
707 unsigned int requested_block_size
;
710 requested_block_size
= data
[1];
712 retval
= setup_dma_descriptors(dev
, requested_block_size
);
721 static int di_cmd_test(struct comedi_device
* dev
, struct comedi_subdevice
* s
,
722 struct comedi_cmd
* cmd
)
728 /* step 1: make sure trigger sources are trivially valid */
730 tmp
= cmd
->start_src
;
731 cmd
->start_src
&= TRIG_NOW
;
732 if (!cmd
->start_src
|| tmp
!= cmd
->start_src
)
735 tmp
= cmd
->scan_begin_src
;
736 cmd
->scan_begin_src
&= TRIG_EXT
;
737 if (!cmd
->scan_begin_src
|| tmp
!= cmd
->scan_begin_src
)
740 tmp
= cmd
->convert_src
;
741 cmd
->convert_src
&= TRIG_NOW
;
742 if (!cmd
->convert_src
|| tmp
!= cmd
->convert_src
)
745 tmp
= cmd
->scan_end_src
;
746 cmd
->scan_end_src
&= TRIG_COUNT
;
747 if (!cmd
->scan_end_src
|| tmp
!= cmd
->scan_end_src
)
751 cmd
->stop_src
&= TRIG_COUNT
| TRIG_NONE
;
752 if (!cmd
->stop_src
|| tmp
!= cmd
->stop_src
)
758 /* step 2: make sure trigger sources are unique and mutually compatible */
761 if (cmd
->stop_src
!= TRIG_COUNT
&& cmd
->stop_src
!= TRIG_NONE
)
767 /* step 3: make sure arguments are trivially compatible */
769 if (!cmd
->chanlist_len
) {
770 cmd
->chanlist_len
= 32;
773 if (cmd
->scan_end_arg
!= cmd
->chanlist_len
) {
774 cmd
->scan_end_arg
= cmd
->chanlist_len
;
778 switch (cmd
->stop_src
) {
780 if (!cmd
->stop_arg
) {
786 if (cmd
->stop_arg
!= 0) {
798 /* step 4: fix up any arguments */
804 for (i
= 1; i
< cmd
->chanlist_len
; i
++) {
805 if (CR_CHAN(cmd
->chanlist
[i
]) != i
) {
806 // XXX could support 8 channels or 16 channels
808 "chanlist must be channels 0 to 31 in order");
821 static int hpdi_cmd_test(struct comedi_device
* dev
, struct comedi_subdevice
* s
,
822 struct comedi_cmd
* cmd
)
824 if (priv(dev
)->dio_config_output
) {
827 return di_cmd_test(dev
, s
, cmd
);
830 static inline void hpdi_writel(struct comedi_device
* dev
, uint32_t bits
,
833 writel(bits
| priv(dev
)->bits
[offset
/ sizeof(uint32_t)],
834 priv(dev
)->hpdi_iobase
+ offset
);
837 static int di_cmd(struct comedi_device
* dev
, struct comedi_subdevice
* s
)
841 struct comedi_async
*async
= s
->async
;
842 struct comedi_cmd
*cmd
= &async
->cmd
;
844 hpdi_writel(dev
, RX_FIFO_RESET_BIT
, BOARD_CONTROL_REG
);
846 DEBUG_PRINT("hpdi: in di_cmd\n");
850 priv(dev
)->dma_desc_index
= 0;
852 /* These register are supposedly unused during chained dma,
853 * but I have found that left over values from last operation
854 * occasionally cause problems with transfer of first dma
855 * block. Initializing them to zero seems to fix the problem. */
856 writel(0, priv(dev
)->plx9080_iobase
+ PLX_DMA0_TRANSFER_SIZE_REG
);
857 writel(0, priv(dev
)->plx9080_iobase
+ PLX_DMA0_PCI_ADDRESS_REG
);
858 writel(0, priv(dev
)->plx9080_iobase
+ PLX_DMA0_LOCAL_ADDRESS_REG
);
859 // give location of first dma descriptor
861 dma_desc_phys_addr
| PLX_DESC_IN_PCI_BIT
| PLX_INTR_TERM_COUNT
|
862 PLX_XFER_LOCAL_TO_PCI
;
863 writel(bits
, priv(dev
)->plx9080_iobase
+ PLX_DMA0_DESCRIPTOR_REG
);
865 // spinlock for plx dma control/status reg
866 comedi_spin_lock_irqsave(&dev
->spinlock
, flags
);
867 // enable dma transfer
868 writeb(PLX_DMA_EN_BIT
| PLX_DMA_START_BIT
| PLX_CLEAR_DMA_INTR_BIT
,
869 priv(dev
)->plx9080_iobase
+ PLX_DMA0_CS_REG
);
870 comedi_spin_unlock_irqrestore(&dev
->spinlock
, flags
);
872 if (cmd
->stop_src
== TRIG_COUNT
)
873 priv(dev
)->dio_count
= cmd
->stop_arg
;
875 priv(dev
)->dio_count
= 1;
877 // clear over/under run status flags
878 writel(RX_UNDERRUN_BIT
| RX_OVERRUN_BIT
,
879 priv(dev
)->hpdi_iobase
+ BOARD_STATUS_REG
);
881 writel(intr_bit(RX_FULL_INTR
),
882 priv(dev
)->hpdi_iobase
+ INTERRUPT_CONTROL_REG
);
884 DEBUG_PRINT("hpdi: starting rx\n");
885 hpdi_writel(dev
, RX_ENABLE_BIT
, BOARD_CONTROL_REG
);
890 static int hpdi_cmd(struct comedi_device
* dev
, struct comedi_subdevice
* s
)
892 if (priv(dev
)->dio_config_output
) {
895 return di_cmd(dev
, s
);
898 static void drain_dma_buffers(struct comedi_device
* dev
, unsigned int channel
)
900 struct comedi_async
*async
= dev
->read_subdev
->async
;
901 uint32_t next_transfer_addr
;
908 priv(dev
)->plx9080_iobase
+ PLX_DMA1_PCI_ADDRESS_REG
;
911 priv(dev
)->plx9080_iobase
+ PLX_DMA0_PCI_ADDRESS_REG
;
913 // loop until we have read all the full buffers
915 for (next_transfer_addr
= readl(pci_addr_reg
);
916 (next_transfer_addr
<
917 le32_to_cpu(priv(dev
)->dma_desc
[priv(dev
)->
918 dma_desc_index
].pci_start_addr
)
919 || next_transfer_addr
>=
920 le32_to_cpu(priv(dev
)->dma_desc
[priv(dev
)->
921 dma_desc_index
].pci_start_addr
) +
922 priv(dev
)->block_size
)
923 && j
< priv(dev
)->num_dma_descriptors
; j
++) {
924 // transfer data from dma buffer to comedi buffer
925 num_samples
= priv(dev
)->block_size
/ sizeof(uint32_t);
926 if (async
->cmd
.stop_src
== TRIG_COUNT
) {
927 if (num_samples
> priv(dev
)->dio_count
)
928 num_samples
= priv(dev
)->dio_count
;
929 priv(dev
)->dio_count
-= num_samples
;
931 cfc_write_array_to_buffer(dev
->read_subdev
,
932 priv(dev
)->desc_dio_buffer
[priv(dev
)->dma_desc_index
],
933 num_samples
* sizeof(uint32_t));
934 priv(dev
)->dma_desc_index
++;
935 priv(dev
)->dma_desc_index
%= priv(dev
)->num_dma_descriptors
;
937 DEBUG_PRINT("next desc addr 0x%lx\n", (unsigned long)
938 priv(dev
)->dma_desc
[priv(dev
)->dma_desc_index
].next
);
939 DEBUG_PRINT("pci addr reg 0x%x\n", next_transfer_addr
);
941 // XXX check for buffer overrun somehow
944 static irqreturn_t
handle_interrupt(int irq
, void *d PT_REGS_ARG
)
946 struct comedi_device
*dev
= d
;
947 struct comedi_subdevice
*s
= dev
->read_subdev
;
948 struct comedi_async
*async
= s
->async
;
949 uint32_t hpdi_intr_status
, hpdi_board_status
;
952 uint8_t dma0_status
, dma1_status
;
955 if (!dev
->attached
) {
959 plx_status
= readl(priv(dev
)->plx9080_iobase
+ PLX_INTRCS_REG
);
960 if ((plx_status
& (ICS_DMA0_A
| ICS_DMA1_A
| ICS_LIA
)) == 0) {
964 hpdi_intr_status
= readl(priv(dev
)->hpdi_iobase
+ INTERRUPT_STATUS_REG
);
965 hpdi_board_status
= readl(priv(dev
)->hpdi_iobase
+ BOARD_STATUS_REG
);
969 if (hpdi_intr_status
) {
970 DEBUG_PRINT("hpdi: intr status 0x%x, ", hpdi_intr_status
);
971 writel(hpdi_intr_status
,
972 priv(dev
)->hpdi_iobase
+ INTERRUPT_STATUS_REG
);
974 // spin lock makes sure noone else changes plx dma control reg
975 comedi_spin_lock_irqsave(&dev
->spinlock
, flags
);
976 dma0_status
= readb(priv(dev
)->plx9080_iobase
+ PLX_DMA0_CS_REG
);
977 if (plx_status
& ICS_DMA0_A
) { // dma chan 0 interrupt
978 writeb((dma0_status
& PLX_DMA_EN_BIT
) | PLX_CLEAR_DMA_INTR_BIT
,
979 priv(dev
)->plx9080_iobase
+ PLX_DMA0_CS_REG
);
981 DEBUG_PRINT("dma0 status 0x%x\n", dma0_status
);
982 if (dma0_status
& PLX_DMA_EN_BIT
) {
983 drain_dma_buffers(dev
, 0);
985 DEBUG_PRINT(" cleared dma ch0 interrupt\n");
987 comedi_spin_unlock_irqrestore(&dev
->spinlock
, flags
);
989 // spin lock makes sure noone else changes plx dma control reg
990 comedi_spin_lock_irqsave(&dev
->spinlock
, flags
);
991 dma1_status
= readb(priv(dev
)->plx9080_iobase
+ PLX_DMA1_CS_REG
);
992 if (plx_status
& ICS_DMA1_A
) // XXX
993 { // dma chan 1 interrupt
994 writeb((dma1_status
& PLX_DMA_EN_BIT
) | PLX_CLEAR_DMA_INTR_BIT
,
995 priv(dev
)->plx9080_iobase
+ PLX_DMA1_CS_REG
);
996 DEBUG_PRINT("dma1 status 0x%x\n", dma1_status
);
998 DEBUG_PRINT(" cleared dma ch1 interrupt\n");
1000 comedi_spin_unlock_irqrestore(&dev
->spinlock
, flags
);
1002 // clear possible plx9080 interrupt sources
1003 if (plx_status
& ICS_LDIA
) { // clear local doorbell interrupt
1004 plx_bits
= readl(priv(dev
)->plx9080_iobase
+ PLX_DBR_OUT_REG
);
1005 writel(plx_bits
, priv(dev
)->plx9080_iobase
+ PLX_DBR_OUT_REG
);
1006 DEBUG_PRINT(" cleared local doorbell bits 0x%x\n", plx_bits
);
1009 if (hpdi_board_status
& RX_OVERRUN_BIT
) {
1010 comedi_error(dev
, "rx fifo overrun");
1011 async
->events
|= COMEDI_CB_EOA
| COMEDI_CB_ERROR
;
1012 DEBUG_PRINT("dma0_status 0x%x\n",
1013 (int)readb(priv(dev
)->plx9080_iobase
+
1017 if (hpdi_board_status
& RX_UNDERRUN_BIT
) {
1018 comedi_error(dev
, "rx fifo underrun");
1019 async
->events
|= COMEDI_CB_EOA
| COMEDI_CB_ERROR
;
1022 if (priv(dev
)->dio_count
== 0)
1023 async
->events
|= COMEDI_CB_EOA
;
1025 DEBUG_PRINT("board status 0x%x, ", hpdi_board_status
);
1026 DEBUG_PRINT("plx status 0x%x\n", plx_status
);
1028 DEBUG_PRINT(" events 0x%x\n", async
->events
);
1030 cfc_handle_events(dev
, s
);
1035 void abort_dma(struct comedi_device
* dev
, unsigned int channel
)
1037 unsigned long flags
;
1039 // spinlock for plx dma control/status reg
1040 comedi_spin_lock_irqsave(&dev
->spinlock
, flags
);
1042 plx9080_abort_dma(priv(dev
)->plx9080_iobase
, channel
);
1044 comedi_spin_unlock_irqrestore(&dev
->spinlock
, flags
);
1047 static int hpdi_cancel(struct comedi_device
* dev
, struct comedi_subdevice
* s
)
1049 hpdi_writel(dev
, 0, BOARD_CONTROL_REG
);
1051 writel(0, priv(dev
)->hpdi_iobase
+ INTERRUPT_CONTROL_REG
);