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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15 #include <linux/module.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>
23 #include <linux/vme.h>
27 static const char driver_name[] = "pio2";
29 static int bus[PIO2_CARDS_MAX];
31 static long base[PIO2_CARDS_MAX];
33 static int vector[PIO2_CARDS_MAX];
34 static int vector_num;
35 static int level[PIO2_CARDS_MAX];
37 static char *variant[PIO2_CARDS_MAX];
38 static int variant_num;
42 static int pio2_match(struct vme_dev *);
43 static int pio2_probe(struct vme_dev *);
44 static int pio2_remove(struct vme_dev *);
46 static int pio2_get_led(struct pio2_card *card)
48 /* Can't read hardware, state saved in structure */
52 static int pio2_set_led(struct pio2_card *card, int state)
57 reg = card->irq_level;
59 /* Register state inverse of led state */
66 retval = vme_master_write(card->window, ®, 1, PIO2_REGS_CTRL);
70 card->led = state ? 1 : 0;
75 static void pio2_int(int level, int vector, void *ptr)
77 int vec, i, channel, retval;
79 struct pio2_card *card = ptr;
81 vec = vector & ~PIO2_VME_VECTOR_MASK;
85 dev_warn(&card->vdev->dev, "Spurious Interrupt\n");
92 retval = vme_master_read(card->window, ®, 1,
93 PIO2_REGS_INT_STAT[vec - 1]);
95 dev_err(&card->vdev->dev,
96 "Unable to read IRQ status register\n");
99 for (i = 0; i < 8; i++) {
100 channel = ((vec - 1) * 8) + i;
101 if (reg & PIO2_CHANNEL_BIT[channel])
102 dev_info(&card->vdev->dev,
103 "Interrupt on I/O channel %d\n",
113 /* Counters are dealt with by their own handler */
114 dev_err(&card->vdev->dev,
115 "Counter interrupt\n");
121 * We return whether this has been successful - this is used in the probe to
122 * ensure we have a valid card.
124 static int pio2_reset_card(struct pio2_card *card)
129 /* Clear main register*/
130 retval = vme_master_write(card->window, &data, 1, PIO2_REGS_CTRL);
134 /* Clear VME vector */
135 retval = vme_master_write(card->window, &data, 1, PIO2_REGS_VME_VECTOR);
140 retval = pio2_gpio_reset(card);
145 retval = pio2_cntr_reset(card);
152 static struct vme_driver pio2_driver = {
156 .remove = pio2_remove,
159 static int __init pio2_init(void)
162 pr_err("No cards, skipping registration\n");
166 if (bus_num > PIO2_CARDS_MAX) {
167 pr_err("Driver only able to handle %d PIO2 Cards\n",
169 bus_num = PIO2_CARDS_MAX;
172 /* Register the PIO2 driver */
173 return vme_register_driver(&pio2_driver, bus_num);
176 static int pio2_match(struct vme_dev *vdev)
178 if (vdev->num >= bus_num) {
180 "The enumeration of the VMEbus to which the board is connected must be specified\n");
184 if (vdev->num >= base_num) {
186 "The VME address for the cards registers must be specified\n");
190 if (vdev->num >= vector_num) {
192 "The IRQ vector used by the card must be specified\n");
196 if (vdev->num >= level_num) {
198 "The IRQ level used by the card must be specified\n");
202 if (vdev->num >= variant_num) {
203 dev_err(&vdev->dev, "The variant of the card must be specified\n");
210 static int pio2_probe(struct vme_dev *vdev)
212 struct pio2_card *card;
218 card = kzalloc(sizeof(struct pio2_card), GFP_KERNEL);
224 card->id = vdev->num;
225 card->bus = bus[card->id];
226 card->base = base[card->id];
227 card->irq_vector = vector[card->id];
228 card->irq_level = level[card->id] & PIO2_VME_INT_MASK;
229 strncpy(card->variant, variant[card->id], PIO2_VARIANT_LENGTH);
232 for (i = 0; i < PIO2_VARIANT_LENGTH; i++) {
233 if (isdigit(card->variant[i]) == 0) {
234 dev_err(&card->vdev->dev, "Variant invalid\n");
241 * Bottom 4 bits of VME interrupt vector used to determine source,
242 * provided vector should only use upper 4 bits.
244 if (card->irq_vector & ~PIO2_VME_VECTOR_MASK) {
245 dev_err(&card->vdev->dev,
246 "Invalid VME IRQ Vector, vector must not use lower 4 bits\n");
252 * There is no way to determine the build variant or whether each bank
253 * is input, output or both at run time. The inputs are also inverted
254 * if configured as both.
256 * We pass in the board variant and use that to determine the
257 * configuration of the banks.
259 for (i = 1; i < PIO2_VARIANT_LENGTH; i++) {
260 switch (card->variant[i]) {
262 card->bank[i - 1].config = NOFIT;
268 card->bank[i - 1].config = INPUT;
271 card->bank[i - 1].config = OUTPUT;
277 card->bank[i - 1].config = BOTH;
282 /* Get a master window and position over regs */
283 card->window = vme_master_request(vdev, VME_A24, VME_SCT, VME_D16);
285 dev_err(&card->vdev->dev,
286 "Unable to assign VME master resource\n");
291 retval = vme_master_set(card->window, 1, card->base, 0x10000, VME_A24,
292 (VME_SCT | VME_USER | VME_DATA), VME_D16);
294 dev_err(&card->vdev->dev,
295 "Unable to configure VME master resource\n");
300 * There is also no obvious register which we can probe to determine
301 * whether the provided base is valid. If we can read the "ID Register"
302 * offset and the reset function doesn't error, assume we have a valid
305 retval = vme_master_read(card->window, ®, 1, PIO2_REGS_ID);
307 dev_err(&card->vdev->dev, "Unable to read from device\n");
311 dev_dbg(&card->vdev->dev, "ID Register:%x\n", reg);
314 * Ensure all the I/O is cleared. We can't read back the states, so
315 * this is the only method we have to ensure that the I/O is in a known
318 retval = pio2_reset_card(card);
320 dev_err(&card->vdev->dev,
321 "Failed to reset card, is location valid?\n");
326 /* Configure VME Interrupts */
327 reg = card->irq_level;
328 if (pio2_get_led(card))
332 retval = vme_master_write(card->window, ®, 1, PIO2_REGS_CTRL);
337 retval = vme_master_write(card->window, &card->irq_vector, 1,
338 PIO2_REGS_VME_VECTOR);
342 /* Attach spurious interrupt handler. */
343 vec = card->irq_vector | PIO2_VME_VECTOR_SPUR;
345 retval = vme_irq_request(vdev, card->irq_level, vec,
346 &pio2_int, (void *)card);
348 dev_err(&card->vdev->dev,
349 "Unable to attach VME interrupt vector0x%x, level 0x%x\n",
350 vec, card->irq_level);
354 /* Attach GPIO interrupt handlers. */
355 for (i = 0; i < 4; i++) {
356 vec = card->irq_vector | PIO2_VECTOR_BANK[i];
358 retval = vme_irq_request(vdev, card->irq_level, vec,
359 &pio2_int, (void *)card);
361 dev_err(&card->vdev->dev,
362 "Unable to attach VME interrupt vector0x%x, level 0x%x\n",
363 vec, card->irq_level);
368 /* Attach counter interrupt handlers. */
369 for (i = 0; i < 6; i++) {
370 vec = card->irq_vector | PIO2_VECTOR_CNTR[i];
372 retval = vme_irq_request(vdev, card->irq_level, vec,
373 &pio2_int, (void *)card);
375 dev_err(&card->vdev->dev,
376 "Unable to attach VME interrupt vector0x%x, level 0x%x\n",
377 vec, card->irq_level);
383 retval = pio2_gpio_init(card);
385 dev_err(&card->vdev->dev,
386 "Unable to register with GPIO framework\n");
390 /* Set LED - This also sets interrupt level */
391 retval = pio2_set_led(card, 0);
393 dev_err(&card->vdev->dev, "Unable to set LED\n");
397 dev_set_drvdata(&card->vdev->dev, card);
399 dev_info(&card->vdev->dev,
400 "PIO2 (variant %s) configured at 0x%lx\n", card->variant,
406 pio2_gpio_exit(card);
412 vec = card->irq_vector | PIO2_VECTOR_CNTR[i];
413 vme_irq_free(vdev, card->irq_level, vec);
420 vec = card->irq_vector | PIO2_VECTOR_BANK[i];
421 vme_irq_free(vdev, card->irq_level, vec);
424 vec = (card->irq_vector & PIO2_VME_VECTOR_MASK) | PIO2_VME_VECTOR_SPUR;
425 vme_irq_free(vdev, card->irq_level, vec);
427 pio2_reset_card(card);
430 vme_master_set(card->window, 0, 0, 0, VME_A16, 0, VME_D16);
432 vme_master_free(card->window);
441 static int pio2_remove(struct vme_dev *vdev)
446 struct pio2_card *card = dev_get_drvdata(&vdev->dev);
448 pio2_gpio_exit(card);
450 for (i = 0; i < 6; i++) {
451 vec = card->irq_vector | PIO2_VECTOR_CNTR[i];
452 vme_irq_free(vdev, card->irq_level, vec);
455 for (i = 0; i < 4; i++) {
456 vec = card->irq_vector | PIO2_VECTOR_BANK[i];
457 vme_irq_free(vdev, card->irq_level, vec);
460 vec = (card->irq_vector & PIO2_VME_VECTOR_MASK) | PIO2_VME_VECTOR_SPUR;
461 vme_irq_free(vdev, card->irq_level, vec);
463 pio2_reset_card(card);
465 vme_master_set(card->window, 0, 0, 0, VME_A16, 0, VME_D16);
467 vme_master_free(card->window);
474 static void __exit pio2_exit(void)
476 vme_unregister_driver(&pio2_driver);
479 /* These are required for each board */
480 MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the board is connected");
481 module_param_array(bus, int, &bus_num, S_IRUGO);
483 MODULE_PARM_DESC(base, "Base VME address for PIO2 Registers");
484 module_param_array(base, long, &base_num, S_IRUGO);
486 MODULE_PARM_DESC(vector, "VME IRQ Vector (Lower 4 bits masked)");
487 module_param_array(vector, int, &vector_num, S_IRUGO);
489 MODULE_PARM_DESC(level, "VME IRQ Level");
490 module_param_array(level, int, &level_num, S_IRUGO);
492 MODULE_PARM_DESC(variant, "Last 4 characters of PIO2 board variant");
493 module_param_array(variant, charp, &variant_num, S_IRUGO);
495 /* This is for debugging */
496 MODULE_PARM_DESC(loopback, "Enable loopback mode on all cards");
497 module_param(loopback, bool, S_IRUGO);
499 MODULE_DESCRIPTION("GE PIO2 6U VME I/O Driver");
500 MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
501 MODULE_LICENSE("GPL");
503 module_init(pio2_init);
504 module_exit(pio2_exit);