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path: root/drivers/misc/carma/carma-fpga-program.c
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Diffstat (limited to 'drivers/misc/carma/carma-fpga-program.c')
-rw-r--r--drivers/misc/carma/carma-fpga-program.c105
1 files changed, 83 insertions, 22 deletions
diff --git a/drivers/misc/carma/carma-fpga-program.c b/drivers/misc/carma/carma-fpga-program.c
index 339b252fcedd..06166ac000e0 100644
--- a/drivers/misc/carma/carma-fpga-program.c
+++ b/drivers/misc/carma/carma-fpga-program.c
@@ -19,6 +19,7 @@
#include <linux/fsldma.h>
#include <linux/interrupt.h>
#include <linux/highmem.h>
+#include <linux/vmalloc.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
@@ -30,8 +31,6 @@
#include <linux/fs.h>
#include <linux/io.h>
-#include <media/videobuf-dma-sg.h>
-
/* MPC8349EMDS specific get_immrbase() */
#include <sysdev/fsl_soc.h>
@@ -67,14 +66,79 @@ struct fpga_dev {
/* FPGA Bitfile */
struct mutex lock;
- struct videobuf_dmabuf vb;
- bool vb_allocated;
+ void *vaddr;
+ struct scatterlist *sglist;
+ int sglen;
+ int nr_pages;
+ bool buf_allocated;
/* max size and written bytes */
size_t fw_size;
size_t bytes;
};
+static int fpga_dma_init(struct fpga_dev *priv, int nr_pages)
+{
+ struct page *pg;
+ int i;
+
+ priv->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
+ if (NULL == priv->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)priv->vaddr,
+ nr_pages << PAGE_SHIFT);
+
+ memset(priv->vaddr, 0, nr_pages << PAGE_SHIFT);
+ priv->nr_pages = nr_pages;
+
+ priv->sglist = vzalloc(priv->nr_pages * sizeof(*priv->sglist));
+ if (NULL == priv->sglist)
+ goto vzalloc_err;
+
+ sg_init_table(priv->sglist, priv->nr_pages);
+ for (i = 0; i < priv->nr_pages; i++) {
+ pg = vmalloc_to_page(priv->vaddr + i * PAGE_SIZE);
+ if (NULL == pg)
+ goto vmalloc_to_page_err;
+ sg_set_page(&priv->sglist[i], pg, PAGE_SIZE, 0);
+ }
+ return 0;
+
+vmalloc_to_page_err:
+ vfree(priv->sglist);
+ priv->sglist = NULL;
+vzalloc_err:
+ vfree(priv->vaddr);
+ priv->vaddr = NULL;
+ return -ENOMEM;
+}
+
+static int fpga_dma_map(struct fpga_dev *priv)
+{
+ priv->sglen = dma_map_sg(priv->dev, priv->sglist,
+ priv->nr_pages, DMA_TO_DEVICE);
+
+ if (0 == priv->sglen) {
+ pr_warn("%s: dma_map_sg failed\n", __func__);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static int fpga_dma_unmap(struct fpga_dev *priv)
+{
+ if (!priv->sglen)
+ return 0;
+
+ dma_unmap_sg(priv->dev, priv->sglist, priv->sglen, DMA_TO_DEVICE);
+ priv->sglen = 0;
+ return 0;
+}
+
/*
* FPGA Bitfile Helpers
*/
@@ -87,8 +151,9 @@ struct fpga_dev {
*/
static void fpga_drop_firmware_data(struct fpga_dev *priv)
{
- videobuf_dma_free(&priv->vb);
- priv->vb_allocated = false;
+ vfree(priv->sglist);
+ vfree(priv->vaddr);
+ priv->buf_allocated = false;
priv->bytes = 0;
}
@@ -427,7 +492,7 @@ static noinline int fpga_program_cpu(struct fpga_dev *priv)
dev_dbg(priv->dev, "enabled the controller\n");
/* Write each chunk of the FPGA bitfile to FPGA programmer */
- ret = fpga_program_block(priv, priv->vb.vaddr, priv->bytes);
+ ret = fpga_program_block(priv, priv->vaddr, priv->bytes);
if (ret)
goto out_disable_controller;
@@ -463,7 +528,6 @@ out_disable_controller:
*/
static noinline int fpga_program_dma(struct fpga_dev *priv)
{
- struct videobuf_dmabuf *vb = &priv->vb;
struct dma_chan *chan = priv->chan;
struct dma_async_tx_descriptor *tx;
size_t num_pages, len, avail = 0;
@@ -505,7 +569,7 @@ static noinline int fpga_program_dma(struct fpga_dev *priv)
}
/* Map the buffer for DMA */
- ret = videobuf_dma_map(priv->dev, &priv->vb);
+ ret = fpga_dma_map(priv);
if (ret) {
dev_err(priv->dev, "Unable to map buffer for DMA\n");
goto out_free_table;
@@ -525,7 +589,7 @@ static noinline int fpga_program_dma(struct fpga_dev *priv)
goto out_dma_unmap;
}
- ret = fsl_dma_external_start(chan, 1)
+ ret = fsl_dma_external_start(chan, 1);
if (ret) {
dev_err(priv->dev, "DMA external control setup failed\n");
goto out_dma_unmap;
@@ -534,7 +598,7 @@ static noinline int fpga_program_dma(struct fpga_dev *priv)
/* setup and submit the DMA transaction */
tx = dmaengine_prep_dma_sg(chan, table.sgl, num_pages,
- vb->sglist, vb->sglen, 0);
+ priv->sglist, priv->sglen, 0);
if (!tx) {
dev_err(priv->dev, "Unable to prep DMA transaction\n");
ret = -ENOMEM;
@@ -572,7 +636,7 @@ static noinline int fpga_program_dma(struct fpga_dev *priv)
out_disable_controller:
fpga_programmer_disable(priv);
out_dma_unmap:
- videobuf_dma_unmap(priv->dev, vb);
+ fpga_dma_unmap(priv);
out_free_table:
sg_free_table(&table);
out_return:
@@ -702,12 +766,12 @@ static int fpga_open(struct inode *inode, struct file *filp)
priv->bytes = 0;
/* Check if we have already allocated a buffer */
- if (priv->vb_allocated)
+ if (priv->buf_allocated)
return 0;
/* Allocate a buffer to hold enough data for the bitfile */
nr_pages = DIV_ROUND_UP(priv->fw_size, PAGE_SIZE);
- ret = videobuf_dma_init_kernel(&priv->vb, DMA_TO_DEVICE, nr_pages);
+ ret = fpga_dma_init(priv, nr_pages);
if (ret) {
dev_err(priv->dev, "unable to allocate data buffer\n");
mutex_unlock(&priv->lock);
@@ -715,7 +779,7 @@ static int fpga_open(struct inode *inode, struct file *filp)
return ret;
}
- priv->vb_allocated = true;
+ priv->buf_allocated = true;
return 0;
}
@@ -738,7 +802,7 @@ static ssize_t fpga_write(struct file *filp, const char __user *buf,
return -ENOSPC;
count = min_t(size_t, priv->fw_size - priv->bytes, count);
- if (copy_from_user(priv->vb.vaddr + priv->bytes, buf, count))
+ if (copy_from_user(priv->vaddr + priv->bytes, buf, count))
return -EFAULT;
priv->bytes += count;
@@ -749,20 +813,19 @@ static ssize_t fpga_read(struct file *filp, char __user *buf, size_t count,
loff_t *f_pos)
{
struct fpga_dev *priv = filp->private_data;
- return simple_read_from_buffer(buf, count, ppos,
- priv->vb.vaddr, priv->bytes);
+ return simple_read_from_buffer(buf, count, f_pos,
+ priv->vaddr, priv->bytes);
}
static loff_t fpga_llseek(struct file *filp, loff_t offset, int origin)
{
struct fpga_dev *priv = filp->private_data;
- loff_t newpos;
/* only read-only opens are allowed to seek */
if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
return -EINVAL;
- return fixed_size_llseek(file, offset, origin, priv->fw_size);
+ return fixed_size_llseek(filp, offset, origin, priv->fw_size);
}
static const struct file_operations fpga_fops = {
@@ -953,7 +1016,6 @@ static int fpga_of_probe(struct platform_device *op)
priv->dev = &op->dev;
mutex_init(&priv->lock);
init_completion(&priv->completion);
- videobuf_dma_init(&priv->vb);
dev_set_drvdata(priv->dev, priv);
dma_cap_zero(mask);
@@ -1091,7 +1153,6 @@ static struct platform_driver fpga_of_driver = {
.driver = {
.name = drv_name,
.of_match_table = fpga_of_match,
- .owner = THIS_MODULE,
},
};
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.