UIO－用户空间驱动的新发展

作者佚名技术来源 Linux系统浏览发布时间 2012-05-13

ce向内核注册了设备. /*
* UIO Hilscher CIF card driver
*/
#include <linux/device.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/uio_driver.h> #include <asm/io.h> #ifndef PCI_DEVICE_ID_PLX_9030
#define PCI_DEVICE_ID_PLX_9030 0x9030
#endif #define PLX9030_INTCSR 0x4C
#define INTSCR_INT1_ENABLE 0x01
#define INTSCR_INT1_STATUS 0x04
#define INT1_ENABLED_AND_ACTIVE (INTSCR_INT1_ENABLE | INTSCR_INT1_STATUS) #define PCI_SUBVENDOR_ID_PEP 0x1518
#define CIF_SUBDEVICE_PROFIBUS 0x430
#define CIF_SUBDEVICE_DEVICENET 0x432
static irqreturn_t hilscher_handler(int irq, struct uio_info *dev_info)
{
void __iomem *plx_intscr = dev_info->mem[0].internal_addr PLX9030_INTCSR; if ((ioread8(plx_intscr) & INT1_ENABLED_AND_ACTIVE)
!= INT1_ENABLED_AND_ACTIVE)
return IRQ_NONE; /* Disable interrupt */
iowrite8(ioread8(plx_intscr) & ~INTSCR_INT1_ENABLE, plx_intscr);
return IRQ_HANDLED;
} static int __devinit hilscher_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, "hilscher"))

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goto out_disable; info->mem[0].addr = pci_resource_start(dev, 0);
if (!info->mem[0].addr)
goto out_release;
info->mem[0].internal_addr = ioremap(pci_resource_start(dev, 0),
pci_resource_len(dev, 0));
if (!info->mem[0].internal_addr)
goto out_release; info->mem[0].size = pci_resource_len(dev, 0);
info->mem[0].memtype = UIO_MEM_PHYS;
info->mem[1].addr = pci_resource_start(dev, 2);
info->mem[1].size = pci_resource_len(dev, 2);
info->mem[1].memtype = UIO_MEM_PHYS;
switch (id->subdevice) {
case CIF_SUBDEVICE_PROFIBUS:
info->name = "CIF_Profibus";
break;
case CIF_SUBDEVICE_DEVICENET:
info->name = "CIF_Devicenet";
break;
default:
info->name = "CIF_???";
}
info->version = "0.0.1";
info->irq = dev->irq;
info->irq_flags = IRQF_DISABLED | IRQF_SHARED;
info->handler = hilscher_handler; if (uio_register_device(&dev->dev, info))
goto out_unmap; pci_set_drvdata(dev, info); return 0;
out_unmap:
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 hilscher_pci_remove(struct pci_dev *dev)
{
struct uio_info *info = pci_get_drvdata(dev); uio_unregister_device(info);
pci_release_regions(dev);
pci_disable_device(dev);
pci_set_drvdata(dev, NULL);
iounmap(info->mem[0].internal_addr); kfree (info);
} static struct pci_device_id hilscher_pci_ids[] = {
{
.vendor = PCI_VENDOR_ID_PLX,
.device = PCI_DEVICE_ID_PLX_9030,
.subvendor = PCI_SUBVENDOR_ID_PEP,
.subdevice = CIF_SUBDEVICE_PROFIBUS,

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},
{
.vendor = PCI_VENDOR_ID_PLX,
.device = PCI_DEVICE_ID_PLX_9030,
.subvendor = PCI_SUBVENDOR_ID_PEP,
.subdevice = C

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