Merge tag 'char-misc-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc driver updates from Greg KH:
 "Here's the big char/misc driver update for 3.19-rc1

  Lots of little things all over the place in different drivers, and a
  new subsystem, "coresight" has been added.  Full details are in the
  shortlog"

* tag 'char-misc-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (73 commits)
  parport: parport_pc, do not remove parent devices early
  spmi: Remove shutdown/suspend/resume kernel-doc
  carma-fpga-program: drop videobuf dependency
  carma-fpga: drop videobuf dependency
  carma-fpga-program.c: fix compile errors
  i8k: Fix temperature bug handling in i8k_get_temp()
  cxl: Name interrupts in /proc/interrupt
  CXL: Return error to PSL if IRQ demultiplexing fails & print clearer warning
  coresight-replicator: remove .owner field for driver
  coresight: fixed comments in coresight.h
  coresight: fix typo in comment in coresight-priv.h
  coresight: bindings for coresight drivers
  coresight: Adding ABI documentation
  w1: support auto-load of w1_bq27000 module.
  w1: avoid potential u16 overflow
  cn: verify msg->len before making callback
  mei: export fw status registers through sysfs
  mei: read and print all six FW status registers
  mei: txe: add cherrytrail device id
  mei: kill cached host and me csr values
  ...

1 files changed, 81 insertions, 17 deletions

diff --git a/drivers/misc/carma/carma-fpga.c b/drivers/misc/carma/carma-fpga.c
index cdf2d7b902bb..68cdfe151bdb 100644
--- a/drivers/misc/carma/carma-fpga.c
+++ b/drivers/misc/carma/carma-fpga.c
@@ -98,6 +98,7 @@
 #include <linux/seq_file.h>
 #include <linux/highmem.h>
 #include <linux/debugfs.h>
+#include <linux/vmalloc.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/poll.h>
@@ -105,8 +106,6 @@
 #include <linux/kref.h>
 #include <linux/io.h>
 
-#include <media/videobuf-dma-sg.h>
-
 /* system controller registers */
 #define SYS_IRQ_SOURCE_CTL	0x24
 #define SYS_IRQ_OUTPUT_EN	0x28
@@ -142,7 +141,10 @@ struct fpga_info {
 
 struct data_buf {
 	struct list_head entry;
-	struct videobuf_dmabuf vb;
+	void *vaddr;
+	struct scatterlist *sglist;
+	int sglen;
+	int nr_pages;
 	size_t size;
 };
 
@@ -207,6 +209,68 @@ static void fpga_device_release(struct kref *ref)
  * Data Buffer Allocation Helpers
  */
 
+static int carma_dma_init(struct data_buf *buf, int nr_pages)
+{
+	struct page *pg;
+	int i;
+
+	buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
+	if (NULL == buf->vaddr) {
+		pr_debug("vmalloc_32(%d pages) failed\n", nr_pages);
+		return -ENOMEM;
+	}
+
+	pr_debug("vmalloc is at addr 0x%08lx, size=%d\n",
+				(unsigned long)buf->vaddr,
+				nr_pages << PAGE_SHIFT);
+
+	memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT);
+	buf->nr_pages = nr_pages;
+
+	buf->sglist = vzalloc(buf->nr_pages * sizeof(*buf->sglist));
+	if (NULL == buf->sglist)
+		goto vzalloc_err;
+
+	sg_init_table(buf->sglist, buf->nr_pages);
+	for (i = 0; i < buf->nr_pages; i++) {
+		pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE);
+		if (NULL == pg)
+			goto vmalloc_to_page_err;
+		sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0);
+	}
+	return 0;
+
+vmalloc_to_page_err:
+	vfree(buf->sglist);
+	buf->sglist = NULL;
+vzalloc_err:
+	vfree(buf->vaddr);
+	buf->vaddr = NULL;
+	return -ENOMEM;
+}
+
+static int carma_dma_map(struct device *dev, struct data_buf *buf)
+{
+	buf->sglen = dma_map_sg(dev, buf->sglist,
+			buf->nr_pages, DMA_FROM_DEVICE);
+
+	if (0 == buf->sglen) {
+		pr_warn("%s: dma_map_sg failed\n", __func__);
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+static int carma_dma_unmap(struct device *dev, struct data_buf *buf)
+{
+	if (!buf->sglen)
+		return 0;
+
+	dma_unmap_sg(dev, buf->sglist, buf->sglen, DMA_FROM_DEVICE);
+	buf->sglen = 0;
+	return 0;
+}
+
 /**
  * data_free_buffer() - free a single data buffer and all allocated memory
  * @buf: the buffer to free
@@ -221,7 +285,8 @@ static void data_free_buffer(struct data_buf *buf)
 		return;
 
 	/* free all memory */
-	videobuf_dma_free(&buf->vb);
+	vfree(buf->sglist);
+	vfree(buf->vaddr);
 	kfree(buf);
 }
 
@@ -230,7 +295,7 @@ static void data_free_buffer(struct data_buf *buf)
  * @bytes: the number of bytes required
  *
  * This allocates all space needed for a data buffer. It must be mapped before
- * use in a DMA transaction using videobuf_dma_map().
+ * use in a DMA transaction using carma_dma_map().
  *
  * Returns NULL on failure
  */
@@ -252,9 +317,8 @@ static struct data_buf *data_alloc_buffer(const size_t bytes)
 	INIT_LIST_HEAD(&buf->entry);
 	buf->size = bytes;
 
-	/* allocate the videobuf */
-	videobuf_dma_init(&buf->vb);
-	ret = videobuf_dma_init_kernel(&buf->vb, DMA_FROM_DEVICE, nr_pages);
+	/* allocate the buffer */
+	ret = carma_dma_init(buf, nr_pages);
 	if (ret)
 		goto out_free_buf;
 
@@ -285,13 +349,13 @@ static void data_free_buffers(struct fpga_device *priv)
 
 	list_for_each_entry_safe(buf, tmp, &priv->free, entry) {
 		list_del_init(&buf->entry);
-		videobuf_dma_unmap(priv->dev, &buf->vb);
+		carma_dma_unmap(priv->dev, buf);
 		data_free_buffer(buf);
 	}
 
 	list_for_each_entry_safe(buf, tmp, &priv->used, entry) {
 		list_del_init(&buf->entry);
-		videobuf_dma_unmap(priv->dev, &buf->vb);
+		carma_dma_unmap(priv->dev, buf);
 		data_free_buffer(buf);
 	}
 
@@ -330,7 +394,7 @@ static int data_alloc_buffers(struct fpga_device *priv)
 			break;
 
 		/* map it for DMA */
-		ret = videobuf_dma_map(priv->dev, &buf->vb);
+		ret = carma_dma_map(priv->dev, buf);
 		if (ret) {
 			data_free_buffer(buf);
 			break;
@@ -634,8 +698,8 @@ static int data_submit_dma(struct fpga_device *priv, struct data_buf *buf)
 	dma_addr_t dst, src;
 	unsigned long dma_flags = 0;
 
-	dst_sg = buf->vb.sglist;
-	dst_nents = buf->vb.sglen;
+	dst_sg = buf->sglist;
+	dst_nents = buf->sglen;
 
 	src_sg = priv->corl_table.sgl;
 	src_nents = priv->corl_nents;
@@ -1134,7 +1198,7 @@ static ssize_t data_read(struct file *filp, char __user *ubuf, size_t count,
 	spin_unlock_irq(&priv->lock);
 
 	/* Buffers are always mapped: unmap it */
-	videobuf_dma_unmap(priv->dev, &dbuf->vb);
+	carma_dma_unmap(priv->dev, dbuf);
 
 	/* save the buffer for later */
 	reader->buf = dbuf;
@@ -1143,7 +1207,7 @@ static ssize_t data_read(struct file *filp, char __user *ubuf, size_t count,
 have_buffer:
 	/* Get the number of bytes available */
 	avail = dbuf->size - reader->buf_start;
-	data = dbuf->vb.vaddr + reader->buf_start;
+	data = dbuf->vaddr + reader->buf_start;
 
 	/* Get the number of bytes we can transfer */
 	count = min(count, avail);
@@ -1171,7 +1235,7 @@ have_buffer:
 	 * If it fails, we pretend that the read never happed and return
 	 * -EFAULT to userspace. The read will be retried.
 	 */
-	ret = videobuf_dma_map(priv->dev, &dbuf->vb);
+	ret = carma_dma_map(priv->dev, dbuf);
 	if (ret) {
 		dev_err(priv->dev, "unable to remap buffer for DMA\n");
 		return -EFAULT;
@@ -1203,7 +1267,7 @@ out_unlock:
 	spin_unlock_irq(&priv->lock);
 
 	if (drop_buffer) {
-		videobuf_dma_unmap(priv->dev, &dbuf->vb);
+		carma_dma_unmap(priv->dev, dbuf);
 		data_free_buffer(dbuf);
 	}