linux/drivers/uio/uio_mf624.c
Michal Sojka 270579d95f uio_mf624: Align memory regions to page size and set correct offsets
mf624 card has its registers not aligned to pages. Since commit
b655028795 ("uio: we cannot mmap unaligned page contents") mmap()ing
mf624 registers fails, because now the uio drivers must set
uio_mem->addr to be page-aligned.

We align the address here and set the newly introduced offs field to
the offset of the mf264 registers within the page so that userspace
can find the address of the mmap()ed register by reading
/sys/class/uio/uio?/maps/map?/offset.

Tested with real mf624 card.

Signed-off-by: Michal Sojka <sojkam1@fel.cvut.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-04-08 18:13:28 +02:00

243 lines
5.9 KiB
C

/*
* 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_setup_mem(struct pci_dev *dev, int bar, struct uio_mem *mem, const char *name)
{
resource_size_t start = pci_resource_start(dev, bar);
resource_size_t len = pci_resource_len(dev, bar);
mem->name = name;
mem->addr = start & PAGE_MASK;
mem->offs = start & ~PAGE_MASK;
if (!mem->addr)
return -ENODEV;
mem->size = ((start & ~PAGE_MASK) + len + PAGE_SIZE - 1) & PAGE_MASK;
mem->memtype = UIO_MEM_PHYS;
mem->internal_addr = pci_ioremap_bar(dev, bar);
if (!mem->internal_addr)
return -ENODEV;
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 */
if (mf624_setup_mem(dev, 0, &info->mem[0], "PCI chipset, interrupts, status "
"bits, special functions"))
goto out_release;
/* BAR2 */
if (mf624_setup_mem(dev, 2, &info->mem[1], "ADC, DAC, DIO"))
goto out_unmap0;
/* BAR4 */
if (mf624_setup_mem(dev, 4, &info->mem[2], "Counter/timer chip"))
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>");