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- #include <linux/string.h>
- #include <linux/slab.h>
- #include <linux/types.h>
- #include <linux/init.h>
- #include <linux/module.h>
- #include <linux/pci.h>
- #include <linux/kernel.h>
- #include <linux/errno.h>
- #include <linux/fs.h>
- #include <linux/cdev.h>
- #include <linux/sysfs.h>
- #include <asm/atomic.h>
- #include <linux/pagemap.h>
- #include <linux/spinlock.h>
- #include <linux/list.h>
- #include <linux/scatterlist.h>
- #include <linux/vmalloc.h>
- #include <linux/stat.h>
- #include <linux/interrupt.h>
- #include <linux/wait.h>
- #include "base.h"
- /**
- *
- * Called when an application open()s a /dev/fpga*, attaches the private data
- * with the file pointer.
- *
- */
- static int pcidriver_open(struct inode *inode, struct file *filp)
- {
- pcidriver_privdata_t *privdata;
- /* Set the private data area for the file */
- privdata = container_of( inode->i_cdev, pcidriver_privdata_t, cdev);
- filp->private_data = privdata;
- pcidriver_module_get(privdata);
- return 0;
- }
- /**
- *
- * Called when the application close()s the file descriptor. Does nothing at
- * the moment.
- *
- */
- static int pcidriver_release(struct inode *inode, struct file *filp)
- {
- pcidriver_privdata_t *privdata;
- /* Get the private data area */
- privdata = filp->private_data;
- pcidriver_module_put(privdata);
- return 0;
- }
- /*************************************************************************/
- /* Internal driver functions */
- static int pcidriver_mmap_bar(pcidriver_privdata_t *privdata, struct vm_area_struct *vmap, int bar)
- {
- #ifdef PCIDRIVER_DUMMY_DEVICE
- return -ENXIO;
- #else /* PCIDRIVER_DUMMY_DEVICE */
- int ret = 0;
- unsigned long bar_addr;
- unsigned long bar_length, vma_size;
- unsigned long bar_flags;
- mod_info_dbg("Entering mmap_pci\n");
- /* Get info of the BAR to be mapped */
- bar_addr = pci_resource_start(privdata->pdev, bar);
- bar_length = pci_resource_len(privdata->pdev, bar);
- bar_flags = pci_resource_flags(privdata->pdev, bar);
- /* Check sizes */
- vma_size = (vmap->vm_end - vmap->vm_start);
- if ((vma_size != bar_length) &&
- ((bar_length < PAGE_SIZE) && (vma_size != PAGE_SIZE))) {
- mod_info( "mmap size is not correct! bar: %lu - vma: %lu\n", bar_length, vma_size );
- return -EINVAL;
- }
- if (bar_flags & IORESOURCE_IO) {
- /* Unlikely case, we will mmap a IO region */
- /* IO regions are never cacheable */
- vmap->vm_page_prot = pgprot_noncached(vmap->vm_page_prot);
- /* Map the BAR */
- ret = io_remap_pfn_range(vmap, vmap->vm_start, (bar_addr >> PAGE_SHIFT), bar_length, vmap->vm_page_prot);
- } else {
- /* Normal case, mmap a memory region */
- /* Ensure this VMA is non-cached, if it is not flaged as prefetchable.
- * If it is prefetchable, caching is allowed and will give better performance.
- * This should be set properly by the BIOS, but we want to be sure. */
- /* adapted from drivers/char/mem.c, mmap function. */
- /* Setting noncached disables MTRR registers, and we want to use them.
- * So we take this code out. This can lead to caching problems if and only if
- * the System BIOS set something wrong. Check LDDv3, page 425.
- */
- // if (!(bar_flags & IORESOURCE_PREFETCH))
- // vmap->vm_page_prot = pgprot_noncached(vmap->vm_page_prot);
- /* Map the BAR */
- ret = remap_pfn_range(vmap, vmap->vm_start, (bar_addr >> PAGE_SHIFT), bar_length, vmap->vm_page_prot);
- }
- if (ret) {
- mod_info("remap_pfn_range failed\n");
- return -EAGAIN;
- }
- return 0; /* success */
- #endif /* PCIDRIVER_DUMMY_DEVICE */
- }
- static int pcidriver_mmap_area(pcidriver_privdata_t *privdata, struct vm_area_struct *vmap)
- {
- int ret = 0;
- unsigned long vma_size;
- mod_info_dbg("Entering mmap_addr\n");
- /* Check sizes */
- vma_size = (vmap->vm_end - vmap->vm_start);
- ret = remap_pfn_range(vmap, vmap->vm_start, vmap->vm_pgoff, vma_size, vmap->vm_page_prot);
- if (ret) {
- mod_info("remap_pfn_range failed\n");
- return -EAGAIN;
- }
- return 0; /* success */
- }
- /**
- *
- * This function is the entry point for mmap() and calls either pcidriver_mmap_bar
- * or pcidriver_mmap_kmem
- *
- * @see pcidriver_mmap_bar
- * @see pcidriver_mmap_kmem
- *
- */
- static int pcidriver_mmap(struct file *filp, struct vm_area_struct *vma)
- {
- pcidriver_privdata_t *privdata;
- int ret = 0, bar;
- mod_info_dbg("Entering mmap\n");
- /* Get the private data area */
- privdata = filp->private_data;
- /* Check the current mmap mode */
- switch (privdata->mmap_mode) {
- case PCIDRIVER_MMAP_PCI:
- bar = privdata->mmap_area;
- if ((bar < 0)||(bar > 5)) {
- mod_info("Attempted to mmap a PCI area with the wrong mmap_area value: %d\n",privdata->mmap_area);
- return -EINVAL;
- }
- ret = pcidriver_mmap_bar(privdata, vma, bar);
- break;
- case PCIDRIVER_MMAP_AREA:
- ret = pcidriver_mmap_area(privdata, vma);
- break;
- case PCIDRIVER_MMAP_KMEM:
- ret = pcidriver_mmap_kmem(privdata, vma);
- break;
- default:
- mod_info( "Invalid mmap_mode value (%d)\n",privdata->mmap_mode );
- return -EINVAL; /* Invalid parameter (mode) */
- }
- return ret;
- }
- static struct file_operations pcidriver_fops = {
- .owner = THIS_MODULE,
- .unlocked_ioctl = pcidriver_ioctl,
- .mmap = pcidriver_mmap,
- .open = pcidriver_open,
- .release = pcidriver_release,
- };
- const struct file_operations *pcidriver_get_fops(void)
- {
- return &pcidriver_fops;
- }
- void pcidriver_module_get(pcidriver_privdata_t *privdata) {
- atomic_inc(&(privdata->refs));
- // mod_info("Ref: %i\n", atomic_read(&(privdata->refs)));
- }
- void pcidriver_module_put(pcidriver_privdata_t *privdata) {
- if (atomic_add_negative(-1, &(privdata->refs))) {
- atomic_inc(&(privdata->refs));
- mod_info("Reference counting error...");
- } else {
- // mod_info("Unref: %i\n", atomic_read(&(privdata->refs)));
- }
- }
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