[PATCH v2] Driver for GE PIO2 VME Card
From: Martyn Welch
Date: Mon Nov 07 2011 - 12:27:17 EST
From: Martyn Welch <martyn.welch@xxxxxxxxxxx>
This patch implements a driver for the GE PIO2 VME Parallel I/O Card. This
card is a 6U VME Card, implementing 32 solid-state relay switched IO lines,
in 4 groups of 8. Each bank of IO lines is built to function as input,
output or both depending on the variant of the card.
Signed-off-by: Martyn Welch <martyn.welch@xxxxxx>
---
This patch provides basic support for the GPIO on the PIO-2 at this point it
does not provide support for IRQs generated by GPIO or the 6 counters also
provided by the board. However, it does provide a good example of how to write
a VME driver for real hardware.
[V2] : Corrections as suggested by Paul Bolle.
drivers/staging/vme/devices/Kconfig | 12 +
drivers/staging/vme/devices/Makefile | 3
drivers/staging/vme/devices/vme_pio2.h | 249 +++++++++++++
drivers/staging/vme/devices/vme_pio2_cntr.c | 71 ++++
drivers/staging/vme/devices/vme_pio2_core.c | 524 +++++++++++++++++++++++++++
drivers/staging/vme/devices/vme_pio2_gpio.c | 227 ++++++++++++
6 files changed, 1086 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/vme/devices/vme_pio2.h
create mode 100644 drivers/staging/vme/devices/vme_pio2_cntr.c
create mode 100644 drivers/staging/vme/devices/vme_pio2_core.c
create mode 100644 drivers/staging/vme/devices/vme_pio2_gpio.c
diff --git a/drivers/staging/vme/devices/Kconfig b/drivers/staging/vme/devices/Kconfig
index ca5ba89..cdba609 100644
--- a/drivers/staging/vme/devices/Kconfig
+++ b/drivers/staging/vme/devices/Kconfig
@@ -6,3 +6,15 @@ config VME_USER
If you say Y here you want to be able to access a limited number of
VME windows in a manner at least semi-compatible with the interface
provided with the original driver at http://vmelinux.org/.
+
+config VME_PIO2
+ tristate "GE PIO2 VME"
+ help
+ If you say Y here you have a GE PIO2. The PIO2 is a 6U VME Card,
+ implementing 32 solid-state relay switched IO lines, in 4 groups of 8.
+ Each bank of IO lines is built to function as input, output or both
+ depending on the variant of the card.
+
+ To compile this driver as a module, choose M here: the
+ module will be called vme_pio2.
+
diff --git a/drivers/staging/vme/devices/Makefile b/drivers/staging/vme/devices/Makefile
index 459742a..172512c 100644
--- a/drivers/staging/vme/devices/Makefile
+++ b/drivers/staging/vme/devices/Makefile
@@ -3,3 +3,6 @@
#
obj-$(CONFIG_VME_USER) += vme_user.o
+
+vme_pio2-objs := vme_pio2_cntr.o vme_pio2_gpio.o vme_pio2_core.o
+obj-$(CONFIG_VME_PIO2) += vme_pio2.o
diff --git a/drivers/staging/vme/devices/vme_pio2.h b/drivers/staging/vme/devices/vme_pio2.h
new file mode 100644
index 0000000..3c59313
--- /dev/null
+++ b/drivers/staging/vme/devices/vme_pio2.h
@@ -0,0 +1,249 @@
+#ifndef _VME_PIO2_H_
+#define _VME_PIO2_H_
+
+#define PIO2_CARDS_MAX 32
+
+#define PIO2_VARIANT_LENGTH 5
+
+#define PIO2_NUM_CHANNELS 32
+#define PIO2_NUM_IRQS 11
+#define PIO2_NUM_CNTRS 6
+
+#define PIO2_REGS_SIZE 0x40
+
+#define PIO2_REGS_DATA0 0x0
+#define PIO2_REGS_DATA1 0x1
+#define PIO2_REGS_DATA2 0x2
+#define PIO2_REGS_DATA3 0x3
+
+static const int PIO2_REGS_DATA[4] = { PIO2_REGS_DATA0, PIO2_REGS_DATA1,
+ PIO2_REGS_DATA2, PIO2_REGS_DATA3 };
+
+#define PIO2_REGS_INT_STAT0 0x8
+#define PIO2_REGS_INT_STAT1 0x9
+#define PIO2_REGS_INT_STAT2 0xa
+#define PIO2_REGS_INT_STAT3 0xb
+
+static const int PIO2_REGS_INT_STAT[4] = { PIO2_REGS_INT_STAT0,
+ PIO2_REGS_INT_STAT1,
+ PIO2_REGS_INT_STAT2,
+ PIO2_REGS_INT_STAT3 };
+
+#define PIO2_REGS_INT_STAT_CNTR 0xc
+#define PIO2_REGS_INT_MASK0 0x10
+#define PIO2_REGS_INT_MASK1 0x11
+#define PIO2_REGS_INT_MASK2 0x12
+#define PIO2_REGS_INT_MASK3 0x13
+#define PIO2_REGS_INT_MASK4 0x14
+#define PIO2_REGS_INT_MASK5 0x15
+#define PIO2_REGS_INT_MASK6 0x16
+#define PIO2_REGS_INT_MASK7 0x17
+
+static const int PIO2_REGS_INT_MASK[8] = { PIO2_REGS_INT_MASK0,
+ PIO2_REGS_INT_MASK1,
+ PIO2_REGS_INT_MASK2,
+ PIO2_REGS_INT_MASK3,
+ PIO2_REGS_INT_MASK4,
+ PIO2_REGS_INT_MASK5,
+ PIO2_REGS_INT_MASK6,
+ PIO2_REGS_INT_MASK7 };
+
+
+
+#define PIO2_REGS_CTRL 0x18
+#define PIO2_REGS_VME_VECTOR 0x19
+#define PIO2_REGS_CNTR0 0x20
+#define PIO2_REGS_CNTR1 0x22
+#define PIO2_REGS_CNTR2 0x24
+#define PIO2_REGS_CTRL_WRD0 0x26
+#define PIO2_REGS_CNTR3 0x28
+#define PIO2_REGS_CNTR4 0x2a
+#define PIO2_REGS_CNTR5 0x2c
+#define PIO2_REGS_CTRL_WRD1 0x2e
+
+#define PIO2_REGS_ID 0x30
+
+
+/* PIO2_REGS_DATAx (0x0 - 0x3) */
+
+static const int PIO2_CHANNEL_BANK[32] = { 0, 0, 0, 0, 0, 0, 0, 0,
+ 1, 1, 1, 1, 1, 1, 1, 1,
+ 2, 2, 2, 2, 2, 2, 2, 2,
+ 3, 3, 3, 3, 3, 3, 3, 3 };
+
+#define PIO2_CHANNEL0_BIT (1 << 0)
+#define PIO2_CHANNEL1_BIT (1 << 1)
+#define PIO2_CHANNEL2_BIT (1 << 2)
+#define PIO2_CHANNEL3_BIT (1 << 3)
+#define PIO2_CHANNEL4_BIT (1 << 4)
+#define PIO2_CHANNEL5_BIT (1 << 5)
+#define PIO2_CHANNEL6_BIT (1 << 6)
+#define PIO2_CHANNEL7_BIT (1 << 7)
+#define PIO2_CHANNEL8_BIT (1 << 0)
+#define PIO2_CHANNEL9_BIT (1 << 1)
+#define PIO2_CHANNEL10_BIT (1 << 2)
+#define PIO2_CHANNEL11_BIT (1 << 3)
+#define PIO2_CHANNEL12_BIT (1 << 4)
+#define PIO2_CHANNEL13_BIT (1 << 5)
+#define PIO2_CHANNEL14_BIT (1 << 6)
+#define PIO2_CHANNEL15_BIT (1 << 7)
+#define PIO2_CHANNEL16_BIT (1 << 0)
+#define PIO2_CHANNEL17_BIT (1 << 1)
+#define PIO2_CHANNEL18_BIT (1 << 2)
+#define PIO2_CHANNEL19_BIT (1 << 3)
+#define PIO2_CHANNEL20_BIT (1 << 4)
+#define PIO2_CHANNEL21_BIT (1 << 5)
+#define PIO2_CHANNEL22_BIT (1 << 6)
+#define PIO2_CHANNEL23_BIT (1 << 7)
+#define PIO2_CHANNEL24_BIT (1 << 0)
+#define PIO2_CHANNEL25_BIT (1 << 1)
+#define PIO2_CHANNEL26_BIT (1 << 2)
+#define PIO2_CHANNEL27_BIT (1 << 3)
+#define PIO2_CHANNEL28_BIT (1 << 4)
+#define PIO2_CHANNEL29_BIT (1 << 5)
+#define PIO2_CHANNEL30_BIT (1 << 6)
+#define PIO2_CHANNEL31_BIT (1 << 7)
+
+static const int PIO2_CHANNEL_BIT[32] = { PIO2_CHANNEL0_BIT, PIO2_CHANNEL1_BIT,
+ PIO2_CHANNEL2_BIT, PIO2_CHANNEL3_BIT,
+ PIO2_CHANNEL4_BIT, PIO2_CHANNEL5_BIT,
+ PIO2_CHANNEL6_BIT, PIO2_CHANNEL7_BIT,
+ PIO2_CHANNEL8_BIT, PIO2_CHANNEL9_BIT,
+ PIO2_CHANNEL10_BIT, PIO2_CHANNEL11_BIT,
+ PIO2_CHANNEL12_BIT, PIO2_CHANNEL13_BIT,
+ PIO2_CHANNEL14_BIT, PIO2_CHANNEL15_BIT,
+ PIO2_CHANNEL16_BIT, PIO2_CHANNEL17_BIT,
+ PIO2_CHANNEL18_BIT, PIO2_CHANNEL19_BIT,
+ PIO2_CHANNEL20_BIT, PIO2_CHANNEL21_BIT,
+ PIO2_CHANNEL22_BIT, PIO2_CHANNEL23_BIT,
+ PIO2_CHANNEL24_BIT, PIO2_CHANNEL25_BIT,
+ PIO2_CHANNEL26_BIT, PIO2_CHANNEL27_BIT,
+ PIO2_CHANNEL28_BIT, PIO2_CHANNEL29_BIT,
+ PIO2_CHANNEL30_BIT, PIO2_CHANNEL31_BIT
+ };
+
+/* PIO2_REGS_INT_STAT_CNTR (0xc) */
+#define PIO2_COUNTER0 (1 << 0)
+#define PIO2_COUNTER1 (1 << 1)
+#define PIO2_COUNTER2 (1 << 2)
+#define PIO2_COUNTER3 (1 << 3)
+#define PIO2_COUNTER4 (1 << 4)
+#define PIO2_COUNTER5 (1 << 5)
+
+static const int PIO2_COUNTER[6] = { PIO2_COUNTER0, PIO2_COUNTER1,
+ PIO2_COUNTER2, PIO2_COUNTER3,
+ PIO2_COUNTER4, PIO2_COUNTER5 };
+
+/* PIO2_REGS_CTRL (0x18) */
+#define PIO2_VME_INT_MASK 0x7
+#define PIO2_LED (1 << 6)
+#define PIO2_LOOP (1 << 7)
+
+/* PIO2_REGS_VME_VECTOR (0x19) */
+#define PIO2_VME_VECTOR_SPUR 0x0
+#define PIO2_VME_VECTOR_BANK0 0x1
+#define PIO2_VME_VECTOR_BANK1 0x2
+#define PIO2_VME_VECTOR_BANK2 0x3
+#define PIO2_VME_VECTOR_BANK3 0x4
+#define PIO2_VME_VECTOR_CNTR0 0x5
+#define PIO2_VME_VECTOR_CNTR1 0x6
+#define PIO2_VME_VECTOR_CNTR2 0x7
+#define PIO2_VME_VECTOR_CNTR3 0x8
+#define PIO2_VME_VECTOR_CNTR4 0x9
+#define PIO2_VME_VECTOR_CNTR5 0xa
+
+#define PIO2_VME_VECTOR_MASK 0xf0
+
+static const int PIO2_VECTOR_BANK[4] = { PIO2_VME_VECTOR_BANK0,
+ PIO2_VME_VECTOR_BANK1,
+ PIO2_VME_VECTOR_BANK2,
+ PIO2_VME_VECTOR_BANK3 };
+
+static const int PIO2_VECTOR_CNTR[6] = { PIO2_VME_VECTOR_CNTR0,
+ PIO2_VME_VECTOR_CNTR1,
+ PIO2_VME_VECTOR_CNTR2,
+ PIO2_VME_VECTOR_CNTR3,
+ PIO2_VME_VECTOR_CNTR4,
+ PIO2_VME_VECTOR_CNTR5 };
+
+/* PIO2_REGS_CNTRx (0x20 - 0x24 & 0x28 - 0x2c) */
+
+static const int PIO2_CNTR_DATA[6] = { PIO2_REGS_CNTR0, PIO2_REGS_CNTR1,
+ PIO2_REGS_CNTR2, PIO2_REGS_CNTR3,
+ PIO2_REGS_CNTR4, PIO2_REGS_CNTR5 };
+
+/* PIO2_REGS_CTRL_WRDx (0x26 & 0x2e) */
+
+static const int PIO2_CNTR_CTRL[6] = { PIO2_REGS_CTRL_WRD0,
+ PIO2_REGS_CTRL_WRD0,
+ PIO2_REGS_CTRL_WRD0,
+ PIO2_REGS_CTRL_WRD1,
+ PIO2_REGS_CTRL_WRD1,
+ PIO2_REGS_CTRL_WRD1 };
+
+#define PIO2_CNTR_SC_DEV0 0
+#define PIO2_CNTR_SC_DEV1 (1 << 6)
+#define PIO2_CNTR_SC_DEV2 (2 << 6)
+#define PIO2_CNTR_SC_RDBACK (3 << 6)
+
+static const int PIO2_CNTR_SC_DEV[6] = { PIO2_CNTR_SC_DEV0, PIO2_CNTR_SC_DEV1,
+ PIO2_CNTR_SC_DEV2, PIO2_CNTR_SC_DEV0,
+ PIO2_CNTR_SC_DEV1, PIO2_CNTR_SC_DEV2 };
+
+#define PIO2_CNTR_RW_LATCH 0
+#define PIO2_CNTR_RW_LSB (1 << 4)
+#define PIO2_CNTR_RW_MSB (2 << 4)
+#define PIO2_CNTR_RW_BOTH (3 << 4)
+
+#define PIO2_CNTR_MODE0 0
+#define PIO2_CNTR_MODE1 (1 << 1)
+#define PIO2_CNTR_MODE2 (2 << 1)
+#define PIO2_CNTR_MODE3 (3 << 1)
+#define PIO2_CNTR_MODE4 (4 << 1)
+#define PIO2_CNTR_MODE5 (5 << 1)
+
+#define PIO2_CNTR_BCD 1
+
+
+
+enum pio2_bank_config { NOFIT, INPUT, OUTPUT, BOTH };
+enum pio2_int_config { NONE = 0, LOW2HIGH = 1, HIGH2LOW = 2, EITHER = 4 };
+
+/* Bank configuration structure */
+struct pio2_io_bank {
+ enum pio2_bank_config config;
+ u8 value;
+ enum pio2_int_config irq[8];
+};
+
+/* Counter configuration structure */
+struct pio2_cntr {
+ int mode;
+ int count;
+};
+
+struct pio2_card {
+ int id;
+ int bus;
+ long base;
+ int irq_vector;
+ int irq_level;
+ char variant[6];
+ int led;
+
+ struct vme_dev *vdev;
+ struct vme_resource *window;
+
+ struct gpio_chip gc;
+ struct pio2_io_bank bank[4];
+
+ struct pio2_cntr cntr[6];
+};
+
+int pio2_cntr_reset(struct pio2_card *);
+
+int pio2_gpio_reset(struct pio2_card *);
+int __init pio2_gpio_init(struct pio2_card *);
+void __exit pio2_gpio_exit(struct pio2_card *);
+
+#endif /* _VME_PIO2_H_ */
diff --git a/drivers/staging/vme/devices/vme_pio2_cntr.c b/drivers/staging/vme/devices/vme_pio2_cntr.c
new file mode 100644
index 0000000..08e0d59
--- /dev/null
+++ b/drivers/staging/vme/devices/vme_pio2_cntr.c
@@ -0,0 +1,71 @@
+/*
+ * GE PIO2 Counter Driver
+ *
+ * Author: Martyn Welch <martyn.welch@xxxxxx>
+ * 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.
+ *
+ * The PIO-2 has 6 counters, currently this code just disables the interrupts
+ * and leaves them alone.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/gpio.h>
+
+#include "../vme.h"
+#include "vme_pio2.h"
+
+static int pio2_cntr_irq_set(struct pio2_card *card, int id)
+{
+ int retval;
+ u8 data;
+
+ data = PIO2_CNTR_SC_DEV[id] | PIO2_CNTR_RW_BOTH | card->cntr[id].mode;
+ retval = vme_master_write(card->window, &data, 1, PIO2_CNTR_CTRL[id]);
+ if (retval < 0)
+ return retval;
+
+ data = card->cntr[id].count & 0xFF;
+ retval = vme_master_write(card->window, &data, 1, PIO2_CNTR_DATA[id]);
+ if (retval < 0)
+ return retval;
+
+ data = (card->cntr[id].count >> 8) & 0xFF;
+ retval = vme_master_write(card->window, &data, 1, PIO2_CNTR_DATA[id]);
+ if (retval < 0)
+ return retval;
+
+ return 0;
+}
+
+int pio2_cntr_reset(struct pio2_card *card)
+{
+ int i, retval = 0;
+ u8 reg;
+
+ /* Clear down all timers */
+ for (i = 0; i < 6; i++) {
+ card->cntr[i].mode = PIO2_CNTR_MODE5;
+ card->cntr[i].count = 0;
+ retval = pio2_cntr_irq_set(card, i);
+ if (retval < 0)
+ return retval;
+ }
+
+ /* Ensure all counter interrupts are cleared */
+ do {
+ retval = vme_master_read(card->window, ®, 1,
+ PIO2_REGS_INT_STAT_CNTR);
+ if (retval < 0)
+ return retval;
+ } while (reg != 0);
+
+ return retval;
+}
+
diff --git a/drivers/staging/vme/devices/vme_pio2_core.c b/drivers/staging/vme/devices/vme_pio2_core.c
new file mode 100644
index 0000000..9fedc44
--- /dev/null
+++ b/drivers/staging/vme/devices/vme_pio2_core.c
@@ -0,0 +1,524 @@
+/*
+ * GE PIO2 6U VME I/O Driver
+ *
+ * Author: Martyn Welch <martyn.welch@xxxxxx>
+ * 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.
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/moduleparam.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 "../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 const char *variant[PIO2_CARDS_MAX];
+static int variant_num;
+
+static int loopback;
+
+static int pio2_match(struct vme_dev *);
+static int __devinit pio2_probe(struct vme_dev *);
+static int __devexit 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 = __devexit_p(pio2_remove),
+};
+
+
+static int __init pio2_init(void)
+{
+ int retval = 0;
+
+ if (bus_num == 0) {
+ printk(KERN_ERR "%s: No cards, skipping registration\n",
+ driver_name);
+ goto err_nocard;
+ }
+
+ if (bus_num > PIO2_CARDS_MAX) {
+ printk(KERN_ERR
+ "%s: Driver only able to handle %d PIO2 Cards\n",
+ driver_name, PIO2_CARDS_MAX);
+ bus_num = PIO2_CARDS_MAX;
+ }
+
+ /* Register the PIO2 driver */
+ retval = vme_register_driver(&pio2_driver, bus_num);
+ if (retval != 0)
+ goto err_reg;
+
+ return retval;
+
+err_reg:
+err_nocard:
+ return retval;
+}
+
+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");
+ return 0;
+ }
+
+ if (vdev->num >= base_num) {
+ dev_err(&vdev->dev,
+ "The VME address for the cards registers must be specified");
+ return 0;
+ }
+
+ if (vdev->num >= vector_num) {
+ dev_err(&vdev->dev,
+ "The IRQ vector used by the card must be specified");
+ return 0;
+ }
+
+ if (vdev->num >= level_num) {
+ dev_err(&vdev->dev,
+ "The IRQ level used by the card must be specified");
+ return 0;
+ }
+
+ if (vdev->num >= variant_num) {
+ dev_err(&vdev->dev, "The variant of the card must be specified");
+ return 0;
+ }
+
+ return 1;
+}
+
+static int __devinit pio2_probe(struct vme_dev *vdev)
+{
+ struct pio2_card *card;
+ int retval;
+ int i;
+ u8 reg;
+ int vec;
+
+ card = kzalloc(sizeof(struct pio2_card), GFP_KERNEL);
+ if (card == NULL) {
+ dev_err(&vdev->dev, "Unable to allocate card structure\n");
+ retval = -ENOMEM;
+ goto err_struct;
+ }
+
+ 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]) == 0) {
+ dev_err(&card->vdev->dev, "Variant invalid\n");
+ retval = -EINVAL;
+ goto err_variant;
+ }
+ }
+
+ /*
+ * 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");
+ retval = -EINVAL;
+ goto err_vector;
+ }
+
+ /*
+ * 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 == NULL) {
+ dev_err(&card->vdev->dev,
+ "Unable to assign VME master resource\n");
+ retval = -EIO;
+ goto err_window;
+ }
+
+ 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?");
+ 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, (void *)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, (void *)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, (void *)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);
+err_window:
+err_vector:
+err_variant:
+ kfree(card);
+err_struct:
+ return retval;
+}
+
+static int __devexit 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);
+
+ kfree(card);
+
+ 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, S_IRUGO);
+
+MODULE_PARM_DESC(base, "Base VME address for PIO2 Registers");
+module_param_array(base, long, &base_num, S_IRUGO);
+
+MODULE_PARM_DESC(vector, "VME IRQ Vector (Lower 4 bits masked)");
+module_param_array(vector, int, &vector_num, S_IRUGO);
+
+MODULE_PARM_DESC(level, "VME IRQ Level");
+module_param_array(level, int, &level_num, S_IRUGO);
+
+MODULE_PARM_DESC(variant, "Last 4 characters of PIO2 board variant");
+module_param_array(variant, charp, &variant_num, S_IRUGO);
+
+/* This is for debugging */
+MODULE_PARM_DESC(loopback, "Enable loopback mode on all cards");
+module_param(loopback, bool, S_IRUGO);
+
+MODULE_DESCRIPTION("GE PIO2 6U VME I/O Driver");
+MODULE_AUTHOR("Martyn Welch <martyn.welch@xxxxxx");
+MODULE_LICENSE("GPL");
+
+module_init(pio2_init);
+module_exit(pio2_exit);
+
diff --git a/drivers/staging/vme/devices/vme_pio2_gpio.c b/drivers/staging/vme/devices/vme_pio2_gpio.c
new file mode 100644
index 0000000..2ac88ad
--- /dev/null
+++ b/drivers/staging/vme/devices/vme_pio2_gpio.c
@@ -0,0 +1,227 @@
+/*
+ * GE PIO2 GPIO Driver
+ *
+ * Author: Martyn Welch <martyn.welch@xxxxxx>
+ * 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.
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/ctype.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+
+#include "../vme.h"
+#include "vme_pio2.h"
+
+static const char driver_name[] = "pio2_gpio";
+
+static struct pio2_card *gpio_to_pio2_card(struct gpio_chip *chip)
+{
+ return container_of(chip, struct pio2_card, gc);
+}
+
+static int pio2_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ u8 reg;
+ int retval;
+ struct pio2_card *card = gpio_to_pio2_card(chip);
+
+ if ((card->bank[PIO2_CHANNEL_BANK[offset]].config == OUTPUT) |
+ (card->bank[PIO2_CHANNEL_BANK[offset]].config == NOFIT)) {
+
+ dev_err(&card->vdev->dev, "Channel not available as input\n");
+ return 0;
+ }
+
+ retval = vme_master_read(card->window, ®, 1,
+ PIO2_REGS_DATA[PIO2_CHANNEL_BANK[offset]]);
+ if (retval < 0) {
+ dev_err(&card->vdev->dev, "Unable to read from GPIO\n");
+ return 0;
+ }
+
+ /*
+ * Remember, input on channels configured as both input and output
+ * are inverted!
+ */
+ if (reg & PIO2_CHANNEL_BIT[offset]) {
+ if (card->bank[PIO2_CHANNEL_BANK[offset]].config != BOTH)
+ return 0;
+ else
+ return 1;
+ } else {
+ if (card->bank[PIO2_CHANNEL_BANK[offset]].config != BOTH)
+ return 1;
+ else
+ return 0;
+ }
+}
+
+static void pio2_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ u8 reg;
+ int retval;
+ struct pio2_card *card = gpio_to_pio2_card(chip);
+
+ if ((card->bank[PIO2_CHANNEL_BANK[offset]].config == INPUT) |
+ (card->bank[PIO2_CHANNEL_BANK[offset]].config == NOFIT)) {
+
+ dev_err(&card->vdev->dev, "Channel not availabe as output\n");
+ return;
+ }
+
+ if (value)
+ reg = card->bank[PIO2_CHANNEL_BANK[offset]].value |
+ PIO2_CHANNEL_BIT[offset];
+ else
+ reg = card->bank[PIO2_CHANNEL_BANK[offset]].value &
+ ~PIO2_CHANNEL_BIT[offset];
+
+ retval = vme_master_write(card->window, ®, 1,
+ PIO2_REGS_DATA[PIO2_CHANNEL_BANK[offset]]);
+ if (retval < 0) {
+ dev_err(&card->vdev->dev, "Unable to write to GPIO\n");
+ return;
+ }
+
+ card->bank[PIO2_CHANNEL_BANK[offset]].value = reg;
+}
+
+/* Directionality configured at board build - send appropriate response */
+static int pio2_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
+{
+ int data;
+ struct pio2_card *card = gpio_to_pio2_card(chip);
+
+ if ((card->bank[PIO2_CHANNEL_BANK[offset]].config == OUTPUT) |
+ (card->bank[PIO2_CHANNEL_BANK[offset]].config == NOFIT)) {
+ dev_err(&card->vdev->dev,
+ "Channel directionality not configurable at runtine\n");
+
+ data = -EINVAL;
+ } else {
+ data = 0;
+ }
+
+ return data;
+}
+
+/* Directionality configured at board build - send appropriate response */
+static int pio2_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int value)
+{
+ int data;
+ struct pio2_card *card = gpio_to_pio2_card(chip);
+
+ if ((card->bank[PIO2_CHANNEL_BANK[offset]].config == INPUT) |
+ (card->bank[PIO2_CHANNEL_BANK[offset]].config == NOFIT)) {
+ dev_err(&card->vdev->dev,
+ "Channel directionality not configurable at runtine\n");
+
+ data = -EINVAL;
+ } else {
+ data = 0;
+ }
+
+ return data;
+}
+
+/*
+ * We return whether this has been successful - this is used in the probe to
+ * ensure we have a valid card.
+ */
+int pio2_gpio_reset(struct pio2_card *card)
+{
+ int retval = 0;
+ int i, j;
+
+ u8 data = 0;
+
+ /* Zero output registers */
+ for (i = 0; i < 4; i++) {
+ retval = vme_master_write(card->window, &data, 1,
+ PIO2_REGS_DATA[i]);
+ if (retval < 0)
+ return retval;
+ card->bank[i].value = 0;
+ }
+
+ /* Set input interrupt masks */
+ for (i = 0; i < 8; i++) {
+ retval = vme_master_write(card->window, &data, 1,
+ PIO2_REGS_INT_MASK[i]);
+ if (retval < 0)
+ return retval;
+
+ for (j = 0; j < 8; j++)
+ card->bank[i].irq[j] = NONE;
+ }
+
+ /* Ensure all I/O interrupts are cleared */
+ for (i = 0; i < 4; i++) {
+ do {
+ retval = vme_master_read(card->window, &data, 1,
+ PIO2_REGS_INT_STAT[i]);
+ if (retval < 0)
+ return retval;
+ } while (data != 0);
+ }
+
+ return 0;
+}
+
+int __init pio2_gpio_init(struct pio2_card *card)
+{
+ int retval = 0;
+ char *label;
+
+ label = kmalloc(PIO2_NUM_CHANNELS, GFP_KERNEL);
+ if (label == NULL) {
+ dev_err(&card->vdev->dev, "Unable to allocate GPIO label\n");
+ return -ENOMEM;
+ }
+
+ sprintf(label, "%s@%s", driver_name, dev_name(&card->vdev->dev));
+ card->gc.label = label;
+
+ card->gc.ngpio = PIO2_NUM_CHANNELS;
+ /* Dynamic allocation of base */
+ card->gc.base = -1;
+ /* Setup pointers to chip functions */
+ card->gc.direction_input = pio2_gpio_dir_in;
+ card->gc.direction_output = pio2_gpio_dir_out;
+ card->gc.get = pio2_gpio_get;
+ card->gc.set = pio2_gpio_set;
+
+ /* This function adds a memory mapped GPIO chip */
+ retval = gpiochip_add(&(card->gc));
+ if (retval) {
+ dev_err(&card->vdev->dev, "Unable to register GPIO\n");
+ kfree(card->gc.label);
+ }
+
+ return retval;
+};
+
+void __exit pio2_gpio_exit(struct pio2_card *card)
+{
+ const char *label = card->gc.label;
+
+ if (gpiochip_remove(&(card->gc)))
+ dev_err(&card->vdev->dev, "Failed to remove GPIO");
+
+ kfree(label);
+}
+
--
Martyn Welch (Principal Software Engineer) | Registered in England and
GE Intelligent Platforms | Wales (3828642) at 100
T +44(0)127322748 | Barbirolli Square, Manchester,
E martyn.welch@xxxxxx | M2 3AB VAT:GB 927559189
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/