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Message-ID: <4EB42331.7070707@ge.com>
Date: Fri, 04 Nov 2011 17:38:57 +0000
From: Martyn Welch <martyn.welch@...com>
To: gregkh@...e.de
CC: Grant Likely <grant.likely@...retlab.ca>,
devel@...verdev.osuosl.org, manohar.vanga@...n.ch, cota@...ap.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Driver for GE PIO2 VME Card
On 04/11/11 17:33, Martyn Welch wrote:
> From: Martyn Welch <martyn.welch@...anuc.com>
>
Agh, how did that get in there. As in the "signed-off-by" line my email
address is (and has been for a while now) "martyn.welch@...com".
Martyn
> 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. The IO lines are provided as input, output or both as a
> build time option.
>
> Signed-off-by: Martyn Welch <martyn.welch@...com>
> ---
>
> 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.
>
> drivers/staging/vme/devices/Kconfig | 10 +
> 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, 1084 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..99f5414 100644
> --- a/drivers/staging/vme/devices/Kconfig
> +++ b/drivers/staging/vme/devices/Kconfig
> @@ -6,3 +6,13 @@ 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.
> + The IO lines are provided as input, output or both as a build time
> + option.
> +
> + Otherwise it is safe to say N here.
> +
> 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@...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.
> + *
> + * 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..0b2db6a
> --- /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@...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.
> + */
> +
> +#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, 0);
> +
> +MODULE_PARM_DESC(base, "Base VME address for PIO2 Registers");
> +module_param_array(base, long, &base_num, 0);
> +
> +MODULE_PARM_DESC(vector, "VME IRQ Vector (Lower 4 bits masked)");
> +module_param_array(vector, int, &vector_num, 0);
> +
> +MODULE_PARM_DESC(level, "VME IRQ Level");
> +module_param_array(level, int, &level_num, 0);
> +
> +MODULE_PARM_DESC(variant, "Last 4 characters of PIO2 board variant");
> +module_param_array(variant, charp, &variant_num, 0);
> +
> +/* This is for debugging */
> +MODULE_PARM_DESC(loopback, "Enable loopback mode on all cards");
> +module_param(loopback, bool, 0);
> +
> +MODULE_DESCRIPTION("GE PIO2 6U VME I/O Driver");
> +MODULE_AUTHOR("Martyn Welch <martyn.welch@...com");
> +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@...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.
> + */
> +
> +#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@...com | M2 3AB VAT:GB 927559189
> _______________________________________________
> devel mailing list
> devel@...uxdriverproject.org
> http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
--
Martyn Welch (Principal Software Engineer) | Registered in England and
GE Intelligent Platforms | Wales (3828642) at 100
T +44(0)1327322748 | Barbirolli Square, Manchester,
E martyn.welch@...com | M2 3AB VAT:GB 927559189
--
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