177 lines
4.2 KiB
C
177 lines
4.2 KiB
C
/*
|
|
* uio_aec.c -- simple driver for Adrienne Electronics Corp time code PCI device
|
|
*
|
|
* Copyright (C) 2008 Brandon Philips <brandon@ifup.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published
|
|
* by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc., 59
|
|
* Temple Place, Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/cdev.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/io.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/uio_driver.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define PCI_VENDOR_ID_AEC 0xaecb
|
|
#define PCI_DEVICE_ID_AEC_VITCLTC 0x6250
|
|
|
|
#define INT_ENABLE_ADDR 0xFC
|
|
#define INT_ENABLE 0x10
|
|
#define INT_DISABLE 0x0
|
|
|
|
#define INT_MASK_ADDR 0x2E
|
|
#define INT_MASK_ALL 0x3F
|
|
|
|
#define INTA_DRVR_ADDR 0xFE
|
|
#define INTA_ENABLED_FLAG 0x08
|
|
#define INTA_FLAG 0x01
|
|
|
|
#define MAILBOX 0x0F
|
|
|
|
static struct pci_device_id ids[] = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), },
|
|
{ 0, }
|
|
};
|
|
MODULE_DEVICE_TABLE(pci, ids);
|
|
|
|
static irqreturn_t aectc_irq(int irq, struct uio_info *dev_info)
|
|
{
|
|
void __iomem *int_flag = dev_info->priv + INTA_DRVR_ADDR;
|
|
unsigned char status = ioread8(int_flag);
|
|
|
|
|
|
if ((status & INTA_ENABLED_FLAG) && (status & INTA_FLAG)) {
|
|
/* application writes 0x00 to 0x2F to get next interrupt */
|
|
status = ioread8(dev_info->priv + MAILBOX);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
static void print_board_data(struct pci_dev *pdev, struct uio_info *i)
|
|
{
|
|
dev_info(&pdev->dev, "PCI-TC board vendor: %x%x number: %x%x"
|
|
" revision: %c%c\n",
|
|
ioread8(i->priv + 0x01),
|
|
ioread8(i->priv + 0x00),
|
|
ioread8(i->priv + 0x03),
|
|
ioread8(i->priv + 0x02),
|
|
ioread8(i->priv + 0x06),
|
|
ioread8(i->priv + 0x07));
|
|
}
|
|
|
|
static int probe(struct pci_dev *pdev, const struct pci_device_id *id)
|
|
{
|
|
struct uio_info *info;
|
|
int ret;
|
|
|
|
info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
if (pci_enable_device(pdev))
|
|
goto out_free;
|
|
|
|
if (pci_request_regions(pdev, "aectc"))
|
|
goto out_disable;
|
|
|
|
info->name = "aectc";
|
|
info->port[0].start = pci_resource_start(pdev, 0);
|
|
if (!info->port[0].start)
|
|
goto out_release;
|
|
info->priv = pci_iomap(pdev, 0, 0);
|
|
if (!info->priv)
|
|
goto out_release;
|
|
info->port[0].size = pci_resource_len(pdev, 0);
|
|
info->port[0].porttype = UIO_PORT_GPIO;
|
|
|
|
info->version = "0.0.1";
|
|
info->irq = pdev->irq;
|
|
info->irq_flags = IRQF_SHARED;
|
|
info->handler = aectc_irq;
|
|
|
|
print_board_data(pdev, info);
|
|
ret = uio_register_device(&pdev->dev, info);
|
|
if (ret)
|
|
goto out_unmap;
|
|
|
|
iowrite32(INT_ENABLE, info->priv + INT_ENABLE_ADDR);
|
|
iowrite8(INT_MASK_ALL, info->priv + INT_MASK_ADDR);
|
|
if (!(ioread8(info->priv + INTA_DRVR_ADDR)
|
|
& INTA_ENABLED_FLAG))
|
|
dev_err(&pdev->dev, "aectc: interrupts not enabled\n");
|
|
|
|
pci_set_drvdata(pdev, info);
|
|
|
|
return 0;
|
|
|
|
out_unmap:
|
|
pci_iounmap(pdev, info->priv);
|
|
out_release:
|
|
pci_release_regions(pdev);
|
|
out_disable:
|
|
pci_disable_device(pdev);
|
|
out_free:
|
|
kfree(info);
|
|
return -ENODEV;
|
|
}
|
|
|
|
static void remove(struct pci_dev *pdev)
|
|
{
|
|
struct uio_info *info = pci_get_drvdata(pdev);
|
|
|
|
/* disable interrupts */
|
|
iowrite8(INT_DISABLE, info->priv + INT_MASK_ADDR);
|
|
iowrite32(INT_DISABLE, info->priv + INT_ENABLE_ADDR);
|
|
/* read mailbox to ensure board drops irq */
|
|
ioread8(info->priv + MAILBOX);
|
|
|
|
uio_unregister_device(info);
|
|
pci_release_regions(pdev);
|
|
pci_disable_device(pdev);
|
|
pci_set_drvdata(pdev, NULL);
|
|
iounmap(info->priv);
|
|
|
|
kfree(info);
|
|
}
|
|
|
|
static struct pci_driver pci_driver = {
|
|
.name = "aectc",
|
|
.id_table = ids,
|
|
.probe = probe,
|
|
.remove = remove,
|
|
};
|
|
|
|
static int __init aectc_init(void)
|
|
{
|
|
return pci_register_driver(&pci_driver);
|
|
}
|
|
|
|
static void __exit aectc_exit(void)
|
|
{
|
|
pci_unregister_driver(&pci_driver);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(aectc_init);
|
|
module_exit(aectc_exit);
|