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* GE PIO2 6U VME I/O Driver
*
* Author: Martyn Welch <martyn.welch@ge.com>
* Copyright 2009 GE Intelligent Platforms Embedded Systems, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/ctype.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/vme.h>
#include "vme_pio2.h"
static const char driver_name[] = "pio2";
static int bus[PIO2_CARDS_MAX];
static int bus_num;
static long base[PIO2_CARDS_MAX];
static int base_num;
static int vector[PIO2_CARDS_MAX];
static int vector_num;
static int level[PIO2_CARDS_MAX];
static int level_num;
static char *variant[PIO2_CARDS_MAX];
static int variant_num;
static bool loopback;
static int pio2_match(struct vme_dev *);
static int pio2_probe(struct vme_dev *);
static int pio2_remove(struct vme_dev *);
static int pio2_get_led(struct pio2_card *card)
{
/* Can't read hardware, state saved in structure */
return card->led;
}
static int pio2_set_led(struct pio2_card *card, int state)
{
u8 reg;
int retval;
reg = card->irq_level;
/* Register state inverse of led state */
if (!state)
reg |= PIO2_LED;
if (loopback)
reg |= PIO2_LOOP;
retval = vme_master_write(card->window, ®, 1, PIO2_REGS_CTRL);
if (retval < 0)
return retval;
card->led = state ? 1 : 0;
return 0;
}
static void pio2_int(int level, int vector, void *ptr)
{
int vec, i, channel, retval;
u8 reg;
struct pio2_card *card = ptr;
vec = vector & ~PIO2_VME_VECTOR_MASK;
switch (vec) {
case 0:
dev_warn(&card->vdev->dev, "Spurious Interrupt\n");
break;
case 1:
case 2:
case 3:
case 4:
/* Channels 0 to 7 */
retval = vme_master_read(card->window, ®, 1,
PIO2_REGS_INT_STAT[vec - 1]);
if (retval < 0) {
dev_err(&card->vdev->dev,
"Unable to read IRQ status register\n");
return;
}
for (i = 0; i < 8; i++) {
channel = ((vec - 1) * 8) + i;
if (reg & PIO2_CHANNEL_BIT[channel])
dev_info(&card->vdev->dev,
"Interrupt on I/O channel %d\n",
channel);
}
break;
case 5:
case 6:
case 7:
case 8:
case 9:
case 10:
/* Counters are dealt with by their own handler */
dev_err(&card->vdev->dev,
"Counter interrupt\n");
break;
}
}
/*
* We return whether this has been successful - this is used in the probe to
* ensure we have a valid card.
*/
static int pio2_reset_card(struct pio2_card *card)
{
int retval = 0;
u8 data = 0;
/* Clear main register*/
retval = vme_master_write(card->window, &data, 1, PIO2_REGS_CTRL);
if (retval < 0)
return retval;
/* Clear VME vector */
retval = vme_master_write(card->window, &data, 1, PIO2_REGS_VME_VECTOR);
if (retval < 0)
return retval;
/* Reset GPIO */
retval = pio2_gpio_reset(card);
if (retval < 0)
return retval;
/* Reset counters */
retval = pio2_cntr_reset(card);
if (retval < 0)
return retval;
return 0;
}
static struct vme_driver pio2_driver = {
.name = driver_name,
.match = pio2_match,
.probe = pio2_probe,
.remove = pio2_remove,
};
static int __init pio2_init(void)
{
if (bus_num == 0) {
pr_err("No cards, skipping registration\n");
return -ENODEV;
}
if (bus_num > PIO2_CARDS_MAX) {
pr_err("Driver only able to handle %d PIO2 Cards\n",
PIO2_CARDS_MAX);
bus_num = PIO2_CARDS_MAX;
}
/* Register the PIO2 driver */
return vme_register_driver(&pio2_driver, bus_num);
}
static int pio2_match(struct vme_dev *vdev)
{
if (vdev->num >= bus_num) {
dev_err(&vdev->dev,
"The enumeration of the VMEbus to which the board is connected must be specified\n");
return 0;
}
if (vdev->num >= base_num) {
dev_err(&vdev->dev,
"The VME address for the cards registers must be specified\n");
return 0;
}
if (vdev->num >= vector_num) {
dev_err(&vdev->dev,
"The IRQ vector used by the card must be specified\n");
return 0;
}
if (vdev->num >= level_num) {
dev_err(&vdev->dev,
"The IRQ level used by the card must be specified\n");
return 0;
}
if (vdev->num >= variant_num) {
dev_err(&vdev->dev, "The variant of the card must be specified\n");
return 0;
}
return 1;
}
static int pio2_probe(struct vme_dev *vdev)
{
struct pio2_card *card;
int retval;
int i;
u8 reg;
int vec;
card = devm_kzalloc(&vdev->dev, sizeof(*card), GFP_KERNEL);
if (!card)
return -ENOMEM;
card->id = vdev->num;
card->bus = bus[card->id];
card->base = base[card->id];
card->irq_vector = vector[card->id];
card->irq_level = level[card->id] & PIO2_VME_INT_MASK;
strncpy(card->variant, variant[card->id], PIO2_VARIANT_LENGTH);
card->vdev = vdev;
for (i = 0; i < PIO2_VARIANT_LENGTH; i++) {
if (!isdigit(card->variant[i])) {
dev_err(&card->vdev->dev, "Variant invalid\n");
return -EINVAL;
}
}
/*
* Bottom 4 bits of VME interrupt vector used to determine source,
* provided vector should only use upper 4 bits.
*/
if (card->irq_vector & ~PIO2_VME_VECTOR_MASK) {
dev_err(&card->vdev->dev,
"Invalid VME IRQ Vector, vector must not use lower 4 bits\n");
return -EINVAL;
}
/*
* There is no way to determine the build variant or whether each bank
* is input, output or both at run time. The inputs are also inverted
* if configured as both.
*
* We pass in the board variant and use that to determine the
* configuration of the banks.
*/
for (i = 1; i < PIO2_VARIANT_LENGTH; i++) {
switch (card->variant[i]) {
case '0':
card->bank[i - 1].config = NOFIT;
break;
case '1':
case '2':
case '3':
case '4':
card->bank[i - 1].config = INPUT;
break;
case '5':
card->bank[i - 1].config = OUTPUT;
break;
case '6':
case '7':
case '8':
case '9':
card->bank[i - 1].config = BOTH;
break;
}
}
/* Get a master window and position over regs */
card->window = vme_master_request(vdev, VME_A24, VME_SCT, VME_D16);
if (!card->window) {
dev_err(&card->vdev->dev,
"Unable to assign VME master resource\n");
return -EIO;
}
retval = vme_master_set(card->window, 1, card->base, 0x10000, VME_A24,
VME_SCT | VME_USER | VME_DATA, VME_D16);
if (retval) {
dev_err(&card->vdev->dev,
"Unable to configure VME master resource\n");
goto err_set;
}
/*
* There is also no obvious register which we can probe to determine
* whether the provided base is valid. If we can read the "ID Register"
* offset and the reset function doesn't error, assume we have a valid
* location.
*/
retval = vme_master_read(card->window, ®, 1, PIO2_REGS_ID);
if (retval < 0) {
dev_err(&card->vdev->dev, "Unable to read from device\n");
goto err_read;
}
dev_dbg(&card->vdev->dev, "ID Register:%x\n", reg);
/*
* Ensure all the I/O is cleared. We can't read back the states, so
* this is the only method we have to ensure that the I/O is in a known
* state.
*/
retval = pio2_reset_card(card);
if (retval) {
dev_err(&card->vdev->dev,
"Failed to reset card, is location valid?\n");
retval = -ENODEV;
goto err_reset;
}
/* Configure VME Interrupts */
reg = card->irq_level;
if (pio2_get_led(card))
reg |= PIO2_LED;
if (loopback)
reg |= PIO2_LOOP;
retval = vme_master_write(card->window, ®, 1, PIO2_REGS_CTRL);
if (retval < 0)
return retval;
/* Set VME vector */
retval = vme_master_write(card->window, &card->irq_vector, 1,
PIO2_REGS_VME_VECTOR);
if (retval < 0)
return retval;
/* Attach spurious interrupt handler. */
vec = card->irq_vector | PIO2_VME_VECTOR_SPUR;
retval = vme_irq_request(vdev, card->irq_level, vec,
&pio2_int, card);
if (retval < 0) {
dev_err(&card->vdev->dev,
"Unable to attach VME interrupt vector0x%x, level 0x%x\n",
vec, card->irq_level);
goto err_irq;
}
/* Attach GPIO interrupt handlers. */
for (i = 0; i < 4; i++) {
vec = card->irq_vector | PIO2_VECTOR_BANK[i];
retval = vme_irq_request(vdev, card->irq_level, vec,
&pio2_int, card);
if (retval < 0) {
dev_err(&card->vdev->dev,
"Unable to attach VME interrupt vector0x%x, level 0x%x\n",
vec, card->irq_level);
goto err_gpio_irq;
}
}
/* Attach counter interrupt handlers. */
for (i = 0; i < 6; i++) {
vec = card->irq_vector | PIO2_VECTOR_CNTR[i];
retval = vme_irq_request(vdev, card->irq_level, vec,
&pio2_int, card);
if (retval < 0) {
dev_err(&card->vdev->dev,
"Unable to attach VME interrupt vector0x%x, level 0x%x\n",
vec, card->irq_level);
goto err_cntr_irq;
}
}
/* Register IO */
retval = pio2_gpio_init(card);
if (retval < 0) {
dev_err(&card->vdev->dev,
"Unable to register with GPIO framework\n");
goto err_gpio;
}
/* Set LED - This also sets interrupt level */
retval = pio2_set_led(card, 0);
if (retval < 0) {
dev_err(&card->vdev->dev, "Unable to set LED\n");
goto err_led;
}
dev_set_drvdata(&card->vdev->dev, card);
dev_info(&card->vdev->dev,
"PIO2 (variant %s) configured at 0x%lx\n", card->variant,
card->base);
return 0;
err_led:
pio2_gpio_exit(card);
err_gpio:
i = 6;
err_cntr_irq:
while (i > 0) {
i--;
vec = card->irq_vector | PIO2_VECTOR_CNTR[i];
vme_irq_free(vdev, card->irq_level, vec);
}
i = 4;
err_gpio_irq:
while (i > 0) {
i--;
vec = card->irq_vector | PIO2_VECTOR_BANK[i];
vme_irq_free(vdev, card->irq_level, vec);
}
vec = (card->irq_vector & PIO2_VME_VECTOR_MASK) | PIO2_VME_VECTOR_SPUR;
vme_irq_free(vdev, card->irq_level, vec);
err_irq:
pio2_reset_card(card);
err_reset:
err_read:
vme_master_set(card->window, 0, 0, 0, VME_A16, 0, VME_D16);
err_set:
vme_master_free(card->window);
return retval;
}
static int pio2_remove(struct vme_dev *vdev)
{
int vec;
int i;
struct pio2_card *card = dev_get_drvdata(&vdev->dev);
pio2_gpio_exit(card);
for (i = 0; i < 6; i++) {
vec = card->irq_vector | PIO2_VECTOR_CNTR[i];
vme_irq_free(vdev, card->irq_level, vec);
}
for (i = 0; i < 4; i++) {
vec = card->irq_vector | PIO2_VECTOR_BANK[i];
vme_irq_free(vdev, card->irq_level, vec);
}
vec = (card->irq_vector & PIO2_VME_VECTOR_MASK) | PIO2_VME_VECTOR_SPUR;
vme_irq_free(vdev, card->irq_level, vec);
pio2_reset_card(card);
vme_master_set(card->window, 0, 0, 0, VME_A16, 0, VME_D16);
vme_master_free(card->window);
return 0;
}
static void __exit pio2_exit(void)
{
vme_unregister_driver(&pio2_driver);
}
/* These are required for each board */
MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the board is connected");
module_param_array(bus, int, &bus_num, 0444);
MODULE_PARM_DESC(base, "Base VME address for PIO2 Registers");
module_param_array(base, long, &base_num, 0444);
MODULE_PARM_DESC(vector, "VME IRQ Vector (Lower 4 bits masked)");
module_param_array(vector, int, &vector_num, 0444);
MODULE_PARM_DESC(level, "VME IRQ Level");
module_param_array(level, int, &level_num, 0444);
MODULE_PARM_DESC(variant, "Last 4 characters of PIO2 board variant");
module_param_array(variant, charp, &variant_num, 0444);
/* This is for debugging */
MODULE_PARM_DESC(loopback, "Enable loopback mode on all cards");
module_param(loopback, bool, 0444);
MODULE_DESCRIPTION("GE PIO2 6U VME I/O Driver");
MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
MODULE_LICENSE("GPL");
module_init(pio2_init);
module_exit(pio2_exit);
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