diff options
Diffstat (limited to 'drivers/misc/carma/carma-fpga.c')
| -rw-r--r-- | drivers/misc/carma/carma-fpga.c | 98 |
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); } |
