uio_fpga.c

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/uio_driver.h>
#include <linux/irq.h>

MODULE_LICENSE("GPL");

#define SAV_IRQ 91

static struct resource uio_resource[] = {
    {
        .start = 0x1f400000,
        .end   = 0x1fffffff,
        .name = "sav_vdma_mem",
        .flags = IORESOURCE_MEM
    },
    {
        .start = 0x43000000,
        .end   = 0x4300ffff,
        .name = "sav_vdma_reg",
        .flags = IORESOURCE_MEM
    },
    {
        .start = 0x62200000,
        .end   = 0x6220ffff,
        .name = "sav_axi_reader",
        .flags = IORESOURCE_MEM
    },
    {
        .start = 0x7B200000,
        .end   = 0x7B20ffff,
        .name = "sav_axi_cfg",
        .flags = IORESOURCE_MEM
    },
};


static irqreturn_t irq_handler(int irq, struct uio_info *dev_info) {
    switch(irq) {
        case SAV_IRQ:
            return IRQ_HANDLED;
    }

    return IRQ_NONE;
}


static struct uio_info myfpga_uio_info = {
    .name = "uio_fpga",
    .version = "0.1",
    .irq = SAV_IRQ,
    .handler = irq_handler,
};


static struct platform_device uio_device = {
    .name      = "uio_pdrv",
    .id = -1,
    .resource   = uio_resource,
    .num_resources   = ARRAY_SIZE(uio_resource),
    .dev.platform_data = &myfpga_uio_info,
};


static int __init mod_init(void)
{
    int ret;

    ret = platform_device_register(&uio_device);
    irq_set_irq_type(SAV_IRQ, IRQ_TYPE_EDGE_RISING);

    printk(KERN_INFO "UIO Module loaded %d\n", ret);

        return 0;
}

static void __exit mod_exit(void)
{
    platform_device_unregister(&uio_device);
}

module_init(mod_init);
module_exit(mod_exit);