/*
* UIO driver fo Humusoft MF624 DAQ card.
* Copyright (C) 2011 Rostislav Lisovy <lisovy@gmail.com>,
* Czech Technical University in Prague
*
* 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.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/uio_driver.h>
#define PCI_VENDOR_ID_HUMUSOFT 0x186c
#define PCI_DEVICE_ID_MF624 0x0624
#define PCI_SUBVENDOR_ID_HUMUSOFT 0x186c
#define PCI_SUBDEVICE_DEVICE 0x0624
/* BAR0 Interrupt control/status register */
#define INTCSR 0x4C
#define INTCSR_ADINT_ENABLE (1 << 0)
#define INTCSR_CTR4INT_ENABLE (1 << 3)
#define INTCSR_PCIINT_ENABLE (1 << 6)
#define INTCSR_ADINT_STATUS (1 << 2)
#define INTCSR_CTR4INT_STATUS (1 << 5)
enum mf624_interrupt_source {ADC, CTR4, ALL};
static void mf624_disable_interrupt(enum mf624_interrupt_source source,
struct uio_info *info)
{
void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
switch (source) {
case ADC:
iowrite32(ioread32(INTCSR_reg)
& ~(INTCSR_ADINT_ENABLE | INTCSR_PCIINT_ENABLE),
INTCSR_reg);
break;
case CTR4:
iowrite32(ioread32(INTCSR_reg)
& ~(INTCSR_CTR4INT_ENABLE | INTCSR_PCIINT_ENABLE),
INTCSR_reg);
break;
case ALL:
default:
iowrite32(ioread32(INTCSR_reg)
& ~(INTCSR_ADINT_ENABLE | INTCSR_CTR4INT_ENABLE
| INTCSR_PCIINT_ENABLE),
INTCSR_reg);
break;
}
}
static void mf624_enable_interrupt(enum mf624_interrupt_source source,
struct uio_info *info)
{
void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
switch (source) {
case ADC:
iowrite32(ioread32(INTCSR_reg)
| INTCSR_ADINT_ENABLE | INTCSR_PCIINT_ENABLE,
INTCSR_reg);
break;
case CTR4:
iowrite32(ioread32(INTCSR_reg)
| INTCSR_CTR4INT_ENABLE | INTCSR_PCIINT_ENABLE,
INTCSR_reg);
break;
case ALL:
default:
iowrite32(ioread32(INTCSR_reg)
| INTCSR_ADINT_ENABLE | INTCSR_CTR4INT_ENABLE
| INTCSR_PCIINT_ENABLE,
INTCSR_reg);
break;
}
}
static irqreturn_t mf624_irq_handler(int irq, struct uio_info *info)
{
void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR;
if ((ioread32(INTCSR_reg) & INTCSR_ADINT_ENABLE)
&& (ioread32(INTCSR_reg) & INTCSR_ADINT_STATUS)) {
mf624_disable_interrupt(ADC, info);
return IRQ_HANDLED;
}
if ((ioread32(INTCSR_reg) & INTCSR_CTR4INT_ENABLE)
&& (ioread32(INTCSR_reg) & INTCSR_CTR4INT_STATUS)) {
mf624_disable_interrupt(CTR4, info);
return IRQ_HANDLED;
}
return IRQ_NONE;
}
static int mf624_irqcontrol(struct uio_info *info, s32 irq_on)
{
if (irq_on == 0)
mf624_disable_interrupt(ALL, info);
else if (irq_on == 1)
mf624_enable_interrupt(ALL, info);
return 0;
}
static int mf624_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
struct uio_info *info;
info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
if (pci_enable_device(dev))
goto out_free;
if (pci_request_regions(dev, "mf624"))
goto out_disable;
info->name = "mf624";
info->version = "0.0.1";
/* Note: Datasheet says device uses BAR0, BAR1, BAR2 -- do not trust it */
/* BAR0 */
info->mem[0].name = "PCI chipset, interrupts, status "
"bits, special functions";
info->mem[0].addr = pci_resource_start(dev, 0);
if (!info->mem[0].addr)
goto out_release;
info->mem[0].size = pci_resource_len(dev, 0);
info->mem[0].memtype = UIO_MEM_PHYS;
info->mem[0].internal_addr = pci_ioremap_bar(dev, 0);
if (!info->mem[0].internal_addr)
goto out_release;
/* BAR2 */
info->mem[1].name = "ADC, DAC, DIO";
info->mem[1].addr = pci_resource_start(dev, 2);
if (!info->mem[1].addr)
goto out_unmap0;
info->mem[1].size = pci_resource_len(dev, 2);
info->mem[1].memtype = UIO_MEM_PHYS;
info->mem[1].internal_addr = pci_ioremap_bar(dev, 2);
if (!info->mem[1].internal_addr)
goto out_unmap0;
/* BAR4 */
info->mem[2].name = "Counter/timer chip";
info->mem[2].addr = pci_resource_start(dev, 4);
if (!info->mem[2].addr)
goto out_unmap1;
info->mem[2].size = pci_resource_len(dev, 4);
info->mem[2].memtype = UIO_MEM_PHYS;
info->mem[2].internal_addr = pci_ioremap_bar(dev, 4);
if (!info->mem[2].internal_addr)
goto out_unmap1;
info->irq = dev->irq;
info->irq_flags = IRQF_SHARED;
info->handler = mf624_irq_handler;
info->irqcontrol = mf624_irqcontrol;
if (uio_register_device(&dev->dev, info))
goto out_unmap2;
pci_set_drvdata(dev, info);
return 0;
out_unmap2:
iounmap(info->mem[2].internal_addr);
out_unmap1:
iounmap(info->mem[1].internal_addr);
out_unmap0:
iounmap(info->mem[0].internal_addr);
out_release:
pci_release_regions(dev);
out_disable:
pci_disable_device(dev);
out_free:
kfree(info);
return -ENODEV;
}
static void mf624_pci_remove(struct pci_dev *dev)
{
struct uio_info *info = pci_get_drvdata(dev);
mf624_disable_interrupt(ALL, info);
uio_unregister_device(info);
pci_release_regions(dev);
pci_disable_device(dev);
iounmap(info->mem[0].internal_addr);
iounmap(info->mem[1].internal_addr);
iounmap(info->mem[2].internal_addr);
kfree(info);
}
static const struct pci_device_id mf624_pci_id[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_HUMUSOFT, PCI_DEVICE_ID_MF624) },
{ 0, }
};
static struct pci_driver mf624_pci_driver = {
.name = "mf624",
.id_table = mf624_pci_id,
.probe = mf624_pci_probe,
.remove = mf624_pci_remove,
};
MODULE_DEVICE_TABLE(pci, mf624_pci_id);
module_pci_driver(mf624_pci_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Rostislav Lisovy <lisovy@gmail.com>");
