2 * GE PIO2 6U VME I/O Driver
4 * Author: Martyn Welch <martyn.welch@ge.com>
5 * Copyright 2009 GE Intelligent Platforms Embedded Systems, Inc.
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
13 #include <linux/version.h>
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/types.h>
17 #include <linux/kernel.h>
18 #include <linux/errno.h>
19 #include <linux/device.h>
20 #include <linux/ctype.h>
21 #include <linux/gpio.h>
22 #include <linux/slab.h>
28 static const char driver_name[] = "pio2";
30 static int bus[PIO2_CARDS_MAX];
32 static long base[PIO2_CARDS_MAX];
34 static int vector[PIO2_CARDS_MAX];
35 static int vector_num;
36 static int level[PIO2_CARDS_MAX];
38 static const char *variant[PIO2_CARDS_MAX];
39 static int variant_num;
43 static int pio2_match(struct vme_dev *);
44 static int __devinit pio2_probe(struct vme_dev *);
45 static int __devexit pio2_remove(struct vme_dev *);
47 static int pio2_get_led(struct pio2_card *card)
49 /* Can't read hardware, state saved in structure */
53 static int pio2_set_led(struct pio2_card *card, int state)
58 reg = card->irq_level;
60 /* Register state inverse of led state */
67 retval = vme_master_write(card->window, ®, 1, PIO2_REGS_CTRL);
71 card->led = state ? 1 : 0;
76 static void pio2_int(int level, int vector, void *ptr)
78 int vec, i, channel, retval;
80 struct pio2_card *card = ptr;
82 vec = vector & ~PIO2_VME_VECTOR_MASK;
86 dev_warn(&card->vdev->dev, "Spurious Interrupt\n");
93 retval = vme_master_read(card->window, ®, 1,
94 PIO2_REGS_INT_STAT[vec - 1]);
96 dev_err(&card->vdev->dev,
97 "Unable to read IRQ status register\n");
100 for (i = 0; i < 8; i++) {
101 channel = ((vec - 1) * 8) + i;
102 if (reg & PIO2_CHANNEL_BIT[channel])
103 dev_info(&card->vdev->dev,
104 "Interrupt on I/O channel %d\n",
114 /* Counters are dealt with by their own handler */
115 dev_err(&card->vdev->dev,
116 "Counter interrupt\n");
123 * We return whether this has been successful - this is used in the probe to
124 * ensure we have a valid card.
126 static int pio2_reset_card(struct pio2_card *card)
131 /* Clear main register*/
132 retval = vme_master_write(card->window, &data, 1, PIO2_REGS_CTRL);
136 /* Clear VME vector */
137 retval = vme_master_write(card->window, &data, 1, PIO2_REGS_VME_VECTOR);
142 retval = pio2_gpio_reset(card);
147 retval = pio2_cntr_reset(card);
154 static struct vme_driver pio2_driver = {
158 .remove = __devexit_p(pio2_remove),
162 static int __init pio2_init(void)
167 printk(KERN_ERR "%s: No cards, skipping registration\n",
172 if (bus_num > PIO2_CARDS_MAX) {
174 "%s: Driver only able to handle %d PIO2 Cards\n",
175 driver_name, PIO2_CARDS_MAX);
176 bus_num = PIO2_CARDS_MAX;
179 /* Register the PIO2 driver */
180 retval = vme_register_driver(&pio2_driver, bus_num);
191 static int pio2_match(struct vme_dev *vdev)
194 if (vdev->num >= bus_num) {
196 "The enumeration of the VMEbus to which the board is connected must be specified");
200 if (vdev->num >= base_num) {
202 "The VME address for the cards registers must be specified");
206 if (vdev->num >= vector_num) {
208 "The IRQ vector used by the card must be specified");
212 if (vdev->num >= level_num) {
214 "The IRQ level used by the card must be specified");
218 if (vdev->num >= variant_num) {
219 dev_err(&vdev->dev, "The variant of the card must be specified");
226 static int __devinit pio2_probe(struct vme_dev *vdev)
228 struct pio2_card *card;
234 card = kzalloc(sizeof(struct pio2_card), GFP_KERNEL);
236 dev_err(&vdev->dev, "Unable to allocate card structure\n");
241 card->id = vdev->num;
242 card->bus = bus[card->id];
243 card->base = base[card->id];
244 card->irq_vector = vector[card->id];
245 card->irq_level = level[card->id] & PIO2_VME_INT_MASK;
246 strncpy(card->variant, variant[card->id], PIO2_VARIANT_LENGTH);
249 for (i = 0; i < PIO2_VARIANT_LENGTH; i++) {
251 if (isdigit(card->variant[i]) == 0) {
252 dev_err(&card->vdev->dev, "Variant invalid\n");
259 * Bottom 4 bits of VME interrupt vector used to determine source,
260 * provided vector should only use upper 4 bits.
262 if (card->irq_vector & ~PIO2_VME_VECTOR_MASK) {
263 dev_err(&card->vdev->dev,
264 "Invalid VME IRQ Vector, vector must not use lower 4 bits\n");
270 * There is no way to determine the build variant or whether each bank
271 * is input, output or both at run time. The inputs are also inverted
272 * if configured as both.
274 * We pass in the board variant and use that to determine the
275 * configuration of the banks.
277 for (i = 1; i < PIO2_VARIANT_LENGTH; i++) {
278 switch (card->variant[i]) {
280 card->bank[i-1].config = NOFIT;
286 card->bank[i-1].config = INPUT;
289 card->bank[i-1].config = OUTPUT;
295 card->bank[i-1].config = BOTH;
300 /* Get a master window and position over regs */
301 card->window = vme_master_request(vdev, VME_A24, VME_SCT, VME_D16);
302 if (card->window == NULL) {
303 dev_err(&card->vdev->dev,
304 "Unable to assign VME master resource\n");
309 retval = vme_master_set(card->window, 1, card->base, 0x10000, VME_A24,
310 (VME_SCT | VME_USER | VME_DATA), VME_D16);
312 dev_err(&card->vdev->dev,
313 "Unable to configure VME master resource\n");
318 * There is also no obvious register which we can probe to determine
319 * whether the provided base is valid. If we can read the "ID Register"
320 * offset and the reset function doesn't error, assume we have a valid
323 retval = vme_master_read(card->window, ®, 1, PIO2_REGS_ID);
325 dev_err(&card->vdev->dev, "Unable to read from device\n");
329 dev_dbg(&card->vdev->dev, "ID Register:%x\n", reg);
332 * Ensure all the I/O is cleared. We can't read back the states, so
333 * this is the only method we have to ensure that the I/O is in a known
336 retval = pio2_reset_card(card);
338 dev_err(&card->vdev->dev,
339 "Failed to reset card, is location valid?");
344 /* Configure VME Interrupts */
345 reg = card->irq_level;
346 if (pio2_get_led(card))
350 retval = vme_master_write(card->window, ®, 1, PIO2_REGS_CTRL);
355 retval = vme_master_write(card->window, &card->irq_vector, 1,
356 PIO2_REGS_VME_VECTOR);
360 /* Attach spurious interrupt handler. */
361 vec = card->irq_vector | PIO2_VME_VECTOR_SPUR;
363 retval = vme_irq_request(vdev, card->irq_level, vec,
364 &pio2_int, (void *)card);
366 dev_err(&card->vdev->dev,
367 "Unable to attach VME interrupt vector0x%x, level 0x%x\n",
368 vec, card->irq_level);
372 /* Attach GPIO interrupt handlers. */
373 for (i = 0; i < 4; i++) {
374 vec = card->irq_vector | PIO2_VECTOR_BANK[i];
376 retval = vme_irq_request(vdev, card->irq_level, vec,
377 &pio2_int, (void *)card);
379 dev_err(&card->vdev->dev,
380 "Unable to attach VME interrupt vector0x%x, level 0x%x\n",
381 vec, card->irq_level);
386 /* Attach counter interrupt handlers. */
387 for (i = 0; i < 6; i++) {
388 vec = card->irq_vector | PIO2_VECTOR_CNTR[i];
390 retval = vme_irq_request(vdev, card->irq_level, vec,
391 &pio2_int, (void *)card);
393 dev_err(&card->vdev->dev,
394 "Unable to attach VME interrupt vector0x%x, level 0x%x\n",
395 vec, card->irq_level);
401 retval = pio2_gpio_init(card);
403 dev_err(&card->vdev->dev,
404 "Unable to register with GPIO framework\n");
408 /* Set LED - This also sets interrupt level */
409 retval = pio2_set_led(card, 0);
411 dev_err(&card->vdev->dev, "Unable to set LED\n");
415 dev_set_drvdata(&card->vdev->dev, card);
417 dev_info(&card->vdev->dev,
418 "PIO2 (variant %s) configured at 0x%lx\n", card->variant,
424 pio2_gpio_exit(card);
430 vec = card->irq_vector | PIO2_VECTOR_CNTR[i];
431 vme_irq_free(vdev, card->irq_level, vec);
438 vec = card->irq_vector | PIO2_VECTOR_BANK[i];
439 vme_irq_free(vdev, card->irq_level, vec);
442 vec = (card->irq_vector & PIO2_VME_VECTOR_MASK) | PIO2_VME_VECTOR_SPUR;
443 vme_irq_free(vdev, card->irq_level, vec);
445 pio2_reset_card(card);
448 vme_master_set(card->window, 0, 0, 0, VME_A16, 0, VME_D16);
450 vme_master_free(card->window);
459 static int __devexit pio2_remove(struct vme_dev *vdev)
464 struct pio2_card *card = dev_get_drvdata(&vdev->dev);
466 pio2_gpio_exit(card);
468 for (i = 0; i < 6; i++) {
469 vec = card->irq_vector | PIO2_VECTOR_CNTR[i];
470 vme_irq_free(vdev, card->irq_level, vec);
473 for (i = 0; i < 4; i++) {
474 vec = card->irq_vector | PIO2_VECTOR_BANK[i];
475 vme_irq_free(vdev, card->irq_level, vec);
478 vec = (card->irq_vector & PIO2_VME_VECTOR_MASK) | PIO2_VME_VECTOR_SPUR;
479 vme_irq_free(vdev, card->irq_level, vec);
481 pio2_reset_card(card);
483 vme_master_set(card->window, 0, 0, 0, VME_A16, 0, VME_D16);
485 vme_master_free(card->window);
492 static void __exit pio2_exit(void)
494 vme_unregister_driver(&pio2_driver);
498 /* These are required for each board */
499 MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the board is connected");
500 module_param_array(bus, int, &bus_num, S_IRUGO);
502 MODULE_PARM_DESC(base, "Base VME address for PIO2 Registers");
503 module_param_array(base, long, &base_num, S_IRUGO);
505 MODULE_PARM_DESC(vector, "VME IRQ Vector (Lower 4 bits masked)");
506 module_param_array(vector, int, &vector_num, S_IRUGO);
508 MODULE_PARM_DESC(level, "VME IRQ Level");
509 module_param_array(level, int, &level_num, S_IRUGO);
511 MODULE_PARM_DESC(variant, "Last 4 characters of PIO2 board variant");
512 module_param_array(variant, charp, &variant_num, S_IRUGO);
514 /* This is for debugging */
515 MODULE_PARM_DESC(loopback, "Enable loopback mode on all cards");
516 module_param(loopback, bool, S_IRUGO);
518 MODULE_DESCRIPTION("GE PIO2 6U VME I/O Driver");
519 MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
520 MODULE_LICENSE("GPL");
522 module_init(pio2_init);
523 module_exit(pio2_exit);