mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Alexandru Ardelean](/assets/img/avatar_default.png)
This change uses the devm_kzalloc() function to tie the life-time of the uio_info object to PCI device. This cleans up the exit & error path a bit. Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Link: https://lore.kernel.org/r/20201120084207.50736-2-alexandru.ardelean@analog.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
225 lines
5.2 KiB
C
225 lines
5.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* UIO driver fo Humusoft MF624 DAQ card.
|
|
* Copyright (C) 2011 Rostislav Lisovy <lisovy@gmail.com>,
|
|
* Czech Technical University in Prague
|
|
*/
|
|
|
|
#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 = devm_kzalloc(&dev->dev, sizeof(struct uio_info), GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
if (pci_enable_device(dev))
|
|
return -ENODEV;
|
|
|
|
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);
|
|
|
|
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);
|
|
}
|
|
|
|
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>");
|