1 files changed, 0 insertions, 363 deletions

diff --git a/drivers/staging/kpc2000/kpc_dma/fileops.c b/drivers/staging/kpc2000/kpc_dma/fileops.c
deleted file mode 100644
index 10dcd6646b01..000000000000
--- a/drivers/staging/kpc2000/kpc_dma/fileops.c
+++ /dev/null
@@ -1,363 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/mm.h>
-#include <linux/kernel.h>   /* printk() */
-#include <linux/slab.h>     /* kmalloc() */
-#include <linux/fs.h>       /* everything... */
-#include <linux/errno.h>    /* error codes */
-#include <linux/types.h>    /* size_t */
-#include <linux/cdev.h>
-#include <linux/uaccess.h>  /* copy_*_user */
-#include <linux/highmem.h>
-#include <linux/pagemap.h>
-#include "kpc_dma_driver.h"
-#include "uapi.h"
-
-/**********  Helper Functions  **********/
-static inline
-unsigned int  count_pages(unsigned long iov_base, size_t iov_len)
-{
-	unsigned long first = (iov_base                 & PAGE_MASK) >> PAGE_SHIFT;
-	unsigned long last  = ((iov_base + iov_len - 1) & PAGE_MASK) >> PAGE_SHIFT;
-
-	return last - first + 1;
-}
-
-static inline
-unsigned int  count_parts_for_sge(struct scatterlist *sg)
-{
-	return DIV_ROUND_UP(sg_dma_len(sg), 0x80000);
-}
-
-/**********  Transfer Helpers  **********/
-static int kpc_dma_transfer(struct dev_private_data *priv,
-			    unsigned long iov_base, size_t iov_len)
-{
-	unsigned int i = 0;
-	int rv = 0, nr_pages = 0;
-	struct kpc_dma_device *ldev;
-	struct aio_cb_data *acd;
-	DECLARE_COMPLETION_ONSTACK(done);
-	u32 desc_needed = 0;
-	struct scatterlist *sg;
-	u32 num_descrs_avail;
-	struct kpc_dma_descriptor *desc;
-	unsigned int pcnt;
-	unsigned int p;
-	u64 card_addr;
-	u64 dma_addr;
-	u64 user_ctl;
-
-	ldev = priv->ldev;
-
-	acd = kzalloc(sizeof(*acd), GFP_KERNEL);
-	if (!acd) {
-		dev_err(&priv->ldev->pldev->dev, "Couldn't kmalloc space for the aio data\n");
-		return -ENOMEM;
-	}
-	memset(acd, 0x66, sizeof(struct aio_cb_data));
-
-	acd->priv = priv;
-	acd->ldev = priv->ldev;
-	acd->cpl = &done;
-	acd->flags = 0;
-	acd->len = iov_len;
-	acd->page_count = count_pages(iov_base, iov_len);
-
-	// Allocate an array of page pointers
-	acd->user_pages = kcalloc(acd->page_count, sizeof(struct page *),
-				  GFP_KERNEL);
-	if (!acd->user_pages) {
-		dev_err(&priv->ldev->pldev->dev, "Couldn't kmalloc space for the page pointers\n");
-		rv = -ENOMEM;
-		goto err_alloc_userpages;
-	}
-
-	// Lock the user buffer pages in memory, and hold on to the page pointers (for the sglist)
-	mmap_read_lock(current->mm);      /*  get memory map semaphore */
-	rv = pin_user_pages(iov_base, acd->page_count, FOLL_TOUCH | FOLL_WRITE,
-			    acd->user_pages, NULL);
-	mmap_read_unlock(current->mm);        /*  release the semaphore */
-	if (rv != acd->page_count) {
-		nr_pages = rv;
-		if (rv > 0)
-			rv = -EFAULT;
-
-		dev_err(&priv->ldev->pldev->dev, "Couldn't pin_user_pages (%d)\n", rv);
-		goto unpin_pages;
-	}
-	nr_pages = acd->page_count;
-
-	// Allocate and setup the sg_table (scatterlist entries)
-	rv = sg_alloc_table_from_pages(&acd->sgt, acd->user_pages, acd->page_count,
-				       iov_base & (PAGE_SIZE - 1), iov_len, GFP_KERNEL);
-	if (rv) {
-		dev_err(&priv->ldev->pldev->dev, "Couldn't alloc sg_table (%d)\n", rv);
-		goto unpin_pages;
-	}
-
-	// Setup the DMA mapping for all the sg entries
-	acd->mapped_entry_count = dma_map_sg(&ldev->pldev->dev, acd->sgt.sgl, acd->sgt.nents,
-					     ldev->dir);
-	if (acd->mapped_entry_count <= 0) {
-		dev_err(&priv->ldev->pldev->dev, "Couldn't dma_map_sg (%d)\n",
-			acd->mapped_entry_count);
-		goto free_table;
-	}
-
-	// Calculate how many descriptors are actually needed for this transfer.
-	for_each_sg(acd->sgt.sgl, sg, acd->mapped_entry_count, i) {
-		desc_needed += count_parts_for_sge(sg);
-	}
-
-	lock_engine(ldev);
-
-	// Figoure out how many descriptors are available and return an error if there aren't enough
-	num_descrs_avail = count_descriptors_available(ldev);
-	dev_dbg(&priv->ldev->pldev->dev,
-		"    mapped_entry_count = %d    num_descrs_needed = %d    num_descrs_avail = %d\n",
-		acd->mapped_entry_count, desc_needed, num_descrs_avail);
-
-	if (desc_needed >= ldev->desc_pool_cnt) {
-		dev_warn(&priv->ldev->pldev->dev,
-			 "    mapped_entry_count = %d    num_descrs_needed = %d    num_descrs_avail = %d    TOO MANY to ever complete!\n",
-			 acd->mapped_entry_count, desc_needed, num_descrs_avail);
-		rv = -EAGAIN;
-		goto err_descr_too_many;
-	}
-	if (desc_needed > num_descrs_avail) {
-		dev_warn(&priv->ldev->pldev->dev,
-			 "    mapped_entry_count = %d    num_descrs_needed = %d    num_descrs_avail = %d    Too many to complete right now.\n",
-			 acd->mapped_entry_count, desc_needed, num_descrs_avail);
-		rv = -EMSGSIZE;
-		goto err_descr_too_many;
-	}
-
-	// Loop through all the sg table entries and fill out a descriptor for each one.
-	desc = ldev->desc_next;
-	card_addr = acd->priv->card_addr;
-	for_each_sg(acd->sgt.sgl, sg, acd->mapped_entry_count, i) {
-		pcnt = count_parts_for_sge(sg);
-		for (p = 0 ; p < pcnt ; p++) {
-			// Fill out the descriptor
-			BUG_ON(!desc);
-			clear_desc(desc);
-			if (p != pcnt - 1)
-				desc->DescByteCount = 0x80000;
-			else
-				desc->DescByteCount = sg_dma_len(sg) - (p * 0x80000);
-
-			desc->DescBufferByteCount = desc->DescByteCount;
-
-			desc->DescControlFlags |= DMA_DESC_CTL_IRQONERR;
-			if (i == 0 && p == 0)
-				desc->DescControlFlags |= DMA_DESC_CTL_SOP;
-			if (i == acd->mapped_entry_count - 1 && p == pcnt - 1)
-				desc->DescControlFlags |= DMA_DESC_CTL_EOP | DMA_DESC_CTL_IRQONDONE;
-
-			desc->DescCardAddrLS = (card_addr & 0xFFFFFFFF);
-			desc->DescCardAddrMS = (card_addr >> 32) & 0xF;
-			card_addr += desc->DescByteCount;
-
-			dma_addr  = sg_dma_address(sg) + (p * 0x80000);
-			desc->DescSystemAddrLS = (dma_addr & 0x00000000FFFFFFFFUL) >>  0;
-			desc->DescSystemAddrMS = (dma_addr & 0xFFFFFFFF00000000UL) >> 32;
-
-			user_ctl = acd->priv->user_ctl;
-			if (i == acd->mapped_entry_count - 1 && p == pcnt - 1)
-				user_ctl = acd->priv->user_ctl_last;
-
-			desc->DescUserControlLS = (user_ctl & 0x00000000FFFFFFFFUL) >>  0;
-			desc->DescUserControlMS = (user_ctl & 0xFFFFFFFF00000000UL) >> 32;
-
-			if (i == acd->mapped_entry_count - 1 && p == pcnt - 1)
-				desc->acd = acd;
-
-			dev_dbg(&priv->ldev->pldev->dev, "  Filled descriptor %p (acd = %p)\n",
-				desc, desc->acd);
-
-			ldev->desc_next = desc->Next;
-			desc = desc->Next;
-		}
-	}
-
-	// Send the filled descriptors off to the hardware to process!
-	SetEngineSWPtr(ldev, ldev->desc_next);
-
-	unlock_engine(ldev);
-
-	rv = wait_for_completion_interruptible(&done);
-	/*
-	 * If the user aborted (rv == -ERESTARTSYS), we're no longer responsible
-	 * for cleaning up the acd
-	 */
-	if (rv == -ERESTARTSYS)
-		acd->cpl = NULL;
-	if (rv == 0) {
-		rv = acd->len;
-		kfree(acd);
-	}
-	return rv;
-
- err_descr_too_many:
-	unlock_engine(ldev);
-	dma_unmap_sg(&ldev->pldev->dev, acd->sgt.sgl, acd->sgt.nents, ldev->dir);
- free_table:
-	sg_free_table(&acd->sgt);
-
- unpin_pages:
-	if (nr_pages > 0)
-		unpin_user_pages(acd->user_pages, nr_pages);
-	kfree(acd->user_pages);
- err_alloc_userpages:
-	kfree(acd);
-	dev_dbg(&priv->ldev->pldev->dev, "%s returning with error %d\n", __func__, rv);
-	return rv;
-}
-
-void  transfer_complete_cb(struct aio_cb_data *acd, size_t xfr_count, u32 flags)
-{
-	unsigned int i;
-
-	BUG_ON(!acd);
-	BUG_ON(!acd->user_pages);
-	BUG_ON(!acd->sgt.sgl);
-	BUG_ON(!acd->ldev);
-	BUG_ON(!acd->ldev->pldev);
-
-	dma_unmap_sg(&acd->ldev->pldev->dev, acd->sgt.sgl, acd->sgt.nents, acd->ldev->dir);
-
-	for (i = 0 ; i < acd->page_count ; i++) {
-		if (!PageReserved(acd->user_pages[i]))
-			set_page_dirty_lock(acd->user_pages[i]);
-	}
-
-	unpin_user_pages(acd->user_pages, acd->page_count);
-
-	sg_free_table(&acd->sgt);
-
-	kfree(acd->user_pages);
-
-	acd->flags = flags;
-
-	if (acd->cpl) {
-		complete(acd->cpl);
-	} else {
-		/*
-		 * There's no completion, so we're responsible for cleaning up
-		 * the acd
-		 */
-		kfree(acd);
-	}
-}
-
-/**********  Fileops  **********/
-static
-int  kpc_dma_open(struct inode *inode, struct file *filp)
-{
-	struct dev_private_data *priv;
-	struct kpc_dma_device *ldev = kpc_dma_lookup_device(iminor(inode));
-
-	if (!ldev)
-		return -ENODEV;
-
-	if (!atomic_dec_and_test(&ldev->open_count)) {
-		atomic_inc(&ldev->open_count);
-		return -EBUSY; /* already open */
-	}
-
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
-
-	priv->ldev = ldev;
-	filp->private_data = priv;
-
-	return 0;
-}
-
-static
-int  kpc_dma_close(struct inode *inode, struct file *filp)
-{
-	struct kpc_dma_descriptor *cur;
-	struct dev_private_data *priv = (struct dev_private_data *)filp->private_data;
-	struct kpc_dma_device *eng = priv->ldev;
-
-	lock_engine(eng);
-
-	stop_dma_engine(eng);
-
-	cur = eng->desc_completed->Next;
-	while (cur != eng->desc_next) {
-		dev_dbg(&eng->pldev->dev, "Aborting descriptor %p (acd = %p)\n", cur, cur->acd);
-		if (cur->DescControlFlags & DMA_DESC_CTL_EOP) {
-			if (cur->acd)
-				transfer_complete_cb(cur->acd, 0, ACD_FLAG_ABORT);
-		}
-
-		clear_desc(cur);
-		eng->desc_completed = cur;
-
-		cur = cur->Next;
-	}
-
-	start_dma_engine(eng);
-
-	unlock_engine(eng);
-
-	atomic_inc(&priv->ldev->open_count); /* release the device */
-	kfree(priv);
-	return 0;
-}
-
-static
-ssize_t  kpc_dma_read(struct file *filp,       char __user *user_buf, size_t count, loff_t *ppos)
-{
-	struct dev_private_data *priv = (struct dev_private_data *)filp->private_data;
-
-	if (priv->ldev->dir != DMA_FROM_DEVICE)
-		return -EMEDIUMTYPE;
-
-	return kpc_dma_transfer(priv, (unsigned long)user_buf, count);
-}
-
-static
-ssize_t  kpc_dma_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *ppos)
-{
-	struct dev_private_data *priv = (struct dev_private_data *)filp->private_data;
-
-	if (priv->ldev->dir != DMA_TO_DEVICE)
-		return -EMEDIUMTYPE;
-
-	return kpc_dma_transfer(priv, (unsigned long)user_buf, count);
-}
-
-static
-long  kpc_dma_ioctl(struct file *filp, unsigned int ioctl_num, unsigned long ioctl_param)
-{
-	struct dev_private_data *priv = (struct dev_private_data *)filp->private_data;
-
-	switch (ioctl_num) {
-	case KND_IOCTL_SET_CARD_ADDR:
-		priv->card_addr  = ioctl_param; return priv->card_addr;
-	case KND_IOCTL_SET_USER_CTL:
-		priv->user_ctl   = ioctl_param; return priv->user_ctl;
-	case KND_IOCTL_SET_USER_CTL_LAST:
-		priv->user_ctl_last = ioctl_param; return priv->user_ctl_last;
-	case KND_IOCTL_GET_USER_STS:
-		return priv->user_sts;
-	}
-
-	return -ENOTTY;
-}
-
-const struct file_operations  kpc_dma_fops = {
-	.owner      = THIS_MODULE,
-	.open           = kpc_dma_open,
-	.release        = kpc_dma_close,
-	.read           = kpc_dma_read,
-	.write          = kpc_dma_write,
-	.unlocked_ioctl = kpc_dma_ioctl,
-};
-