230 lines
6.5 KiB
C
230 lines
6.5 KiB
C
/*
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User DMA
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Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
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Copyright (C) 2004 Chris Kennedy <c@groovy.org>
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Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "ivtv-driver.h"
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#include "ivtv-udma.h"
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void ivtv_udma_get_page_info(struct ivtv_dma_page_info *dma_page, unsigned long first, unsigned long size)
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{
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dma_page->uaddr = first & PAGE_MASK;
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dma_page->offset = first & ~PAGE_MASK;
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dma_page->tail = 1 + ((first+size-1) & ~PAGE_MASK);
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dma_page->first = (first & PAGE_MASK) >> PAGE_SHIFT;
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dma_page->last = ((first+size-1) & PAGE_MASK) >> PAGE_SHIFT;
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dma_page->page_count = dma_page->last - dma_page->first + 1;
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if (dma_page->page_count == 1) dma_page->tail -= dma_page->offset;
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}
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int ivtv_udma_fill_sg_list (struct ivtv_user_dma *dma, struct ivtv_dma_page_info *dma_page, int map_offset)
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{
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int i, offset;
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unsigned long flags;
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if (map_offset < 0)
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return map_offset;
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offset = dma_page->offset;
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/* Fill SG Array with new values */
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for (i = 0; i < dma_page->page_count; i++) {
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unsigned int len = (i == dma_page->page_count - 1) ?
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dma_page->tail : PAGE_SIZE - offset;
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if (PageHighMem(dma->map[map_offset])) {
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void *src;
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if (dma->bouncemap[map_offset] == NULL)
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dma->bouncemap[map_offset] = alloc_page(GFP_KERNEL);
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if (dma->bouncemap[map_offset] == NULL)
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return -1;
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local_irq_save(flags);
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src = kmap_atomic(dma->map[map_offset], KM_BOUNCE_READ) + offset;
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memcpy(page_address(dma->bouncemap[map_offset]) + offset, src, len);
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kunmap_atomic(src, KM_BOUNCE_READ);
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local_irq_restore(flags);
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sg_set_page(&dma->SGlist[map_offset], dma->bouncemap[map_offset], len, offset);
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}
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else {
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sg_set_page(&dma->SGlist[map_offset], dma->map[map_offset], len, offset);
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}
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offset = 0;
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map_offset++;
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}
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return map_offset;
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}
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void ivtv_udma_fill_sg_array (struct ivtv_user_dma *dma, u32 buffer_offset, u32 buffer_offset_2, u32 split) {
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int i;
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struct scatterlist *sg;
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for (i = 0, sg = dma->SGlist; i < dma->SG_length; i++, sg++) {
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dma->SGarray[i].size = cpu_to_le32(sg_dma_len(sg));
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dma->SGarray[i].src = cpu_to_le32(sg_dma_address(sg));
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dma->SGarray[i].dst = cpu_to_le32(buffer_offset);
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buffer_offset += sg_dma_len(sg);
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split -= sg_dma_len(sg);
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if (split == 0)
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buffer_offset = buffer_offset_2;
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}
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}
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/* User DMA Buffers */
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void ivtv_udma_alloc(struct ivtv *itv)
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{
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if (itv->udma.SG_handle == 0) {
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/* Map DMA Page Array Buffer */
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itv->udma.SG_handle = pci_map_single(itv->pdev, itv->udma.SGarray,
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sizeof(itv->udma.SGarray), PCI_DMA_TODEVICE);
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ivtv_udma_sync_for_cpu(itv);
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}
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}
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int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_dest_addr,
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void __user *userbuf, int size_in_bytes)
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{
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struct ivtv_dma_page_info user_dma;
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struct ivtv_user_dma *dma = &itv->udma;
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int i, err;
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IVTV_DEBUG_DMA("ivtv_udma_setup, dst: 0x%08x\n", (unsigned int)ivtv_dest_addr);
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/* Still in USE */
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if (dma->SG_length || dma->page_count) {
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IVTV_DEBUG_WARN("ivtv_udma_setup: SG_length %d page_count %d still full?\n",
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dma->SG_length, dma->page_count);
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return -EBUSY;
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}
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ivtv_udma_get_page_info(&user_dma, (unsigned long)userbuf, size_in_bytes);
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if (user_dma.page_count <= 0) {
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IVTV_DEBUG_WARN("ivtv_udma_setup: Error %d page_count from %d bytes %d offset\n",
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user_dma.page_count, size_in_bytes, user_dma.offset);
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return -EINVAL;
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}
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/* Get user pages for DMA Xfer */
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down_read(¤t->mm->mmap_sem);
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err = get_user_pages(current, current->mm,
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user_dma.uaddr, user_dma.page_count, 0, 1, dma->map, NULL);
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up_read(¤t->mm->mmap_sem);
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if (user_dma.page_count != err) {
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IVTV_DEBUG_WARN("failed to map user pages, returned %d instead of %d\n",
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err, user_dma.page_count);
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return -EINVAL;
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}
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dma->page_count = user_dma.page_count;
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/* Fill SG List with new values */
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if (ivtv_udma_fill_sg_list(dma, &user_dma, 0) < 0) {
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for (i = 0; i < dma->page_count; i++) {
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put_page(dma->map[i]);
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}
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dma->page_count = 0;
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return -ENOMEM;
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}
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/* Map SG List */
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dma->SG_length = pci_map_sg(itv->pdev, dma->SGlist, dma->page_count, PCI_DMA_TODEVICE);
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/* Fill SG Array with new values */
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ivtv_udma_fill_sg_array (dma, ivtv_dest_addr, 0, -1);
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/* Tag SG Array with Interrupt Bit */
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dma->SGarray[dma->SG_length - 1].size |= cpu_to_le32(0x80000000);
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ivtv_udma_sync_for_device(itv);
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return dma->page_count;
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}
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void ivtv_udma_unmap(struct ivtv *itv)
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{
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struct ivtv_user_dma *dma = &itv->udma;
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int i;
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IVTV_DEBUG_INFO("ivtv_unmap_user_dma\n");
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/* Nothing to free */
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if (dma->page_count == 0)
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return;
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/* Unmap Scatterlist */
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if (dma->SG_length) {
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pci_unmap_sg(itv->pdev, dma->SGlist, dma->page_count, PCI_DMA_TODEVICE);
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dma->SG_length = 0;
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}
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/* sync DMA */
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ivtv_udma_sync_for_cpu(itv);
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/* Release User Pages */
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for (i = 0; i < dma->page_count; i++) {
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put_page(dma->map[i]);
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}
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dma->page_count = 0;
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}
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void ivtv_udma_free(struct ivtv *itv)
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{
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int i;
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/* Unmap SG Array */
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if (itv->udma.SG_handle) {
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pci_unmap_single(itv->pdev, itv->udma.SG_handle,
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sizeof(itv->udma.SGarray), PCI_DMA_TODEVICE);
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}
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/* Unmap Scatterlist */
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if (itv->udma.SG_length) {
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pci_unmap_sg(itv->pdev, itv->udma.SGlist, itv->udma.page_count, PCI_DMA_TODEVICE);
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}
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for (i = 0; i < IVTV_DMA_SG_OSD_ENT; i++) {
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if (itv->udma.bouncemap[i])
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__free_page(itv->udma.bouncemap[i]);
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}
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}
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void ivtv_udma_start(struct ivtv *itv)
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{
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IVTV_DEBUG_DMA("start UDMA\n");
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write_reg(itv->udma.SG_handle, IVTV_REG_DECDMAADDR);
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write_reg_sync(read_reg(IVTV_REG_DMAXFER) | 0x01, IVTV_REG_DMAXFER);
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set_bit(IVTV_F_I_DMA, &itv->i_flags);
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set_bit(IVTV_F_I_UDMA, &itv->i_flags);
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clear_bit(IVTV_F_I_UDMA_PENDING, &itv->i_flags);
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}
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void ivtv_udma_prepare(struct ivtv *itv)
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{
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unsigned long flags;
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spin_lock_irqsave(&itv->dma_reg_lock, flags);
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if (!test_bit(IVTV_F_I_DMA, &itv->i_flags))
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ivtv_udma_start(itv);
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else
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set_bit(IVTV_F_I_UDMA_PENDING, &itv->i_flags);
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spin_unlock_irqrestore(&itv->dma_reg_lock, flags);
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}
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