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![Krzysztof Hałasa](/assets/img/avatar_default.png)
Signed-off-by: Krzysztof Hałasa <khalasa@piap.pl> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
305 lines
7.3 KiB
C
305 lines
7.3 KiB
C
/*
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* Copyright (C) 2010 Bluecherry, LLC www.bluecherrydvr.com
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* Copyright (C) 2010 Ben Collins <bcollins@bluecherry.net>
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*
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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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*
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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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*
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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 <linux/kernel.h>
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#include <linux/scatterlist.h>
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#include "solo6x10.h"
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/* #define SOLO_TEST_P2M */
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int solo_p2m_dma(struct solo_dev *solo_dev, u8 id, int wr,
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void *sys_addr, u32 ext_addr, u32 size)
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{
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dma_addr_t dma_addr;
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int ret;
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WARN_ON(!size);
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BUG_ON(id >= SOLO_NR_P2M);
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if (!size)
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return -EINVAL;
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dma_addr = pci_map_single(solo_dev->pdev, sys_addr, size,
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wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
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ret = solo_p2m_dma_t(solo_dev, id, wr, dma_addr, ext_addr, size);
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pci_unmap_single(solo_dev->pdev, dma_addr, size,
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wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
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return ret;
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}
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int solo_p2m_dma_t(struct solo_dev *solo_dev, u8 id, int wr,
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dma_addr_t dma_addr, u32 ext_addr, u32 size)
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{
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struct p2m_desc *desc = kzalloc(sizeof(*desc) * 2, GFP_DMA);
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int ret;
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if (desc == NULL)
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return -ENOMEM;
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solo_p2m_push_desc(&desc[1], wr, dma_addr, ext_addr, size, 0, 0);
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ret = solo_p2m_dma_desc(solo_dev, id, desc, 2);
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kfree(desc);
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return ret;
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}
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void solo_p2m_push_desc(struct p2m_desc *desc, int wr, dma_addr_t dma_addr,
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u32 ext_addr, u32 size, int repeat, u32 ext_size)
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{
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desc->ta = cpu_to_le32(dma_addr);
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desc->fa = cpu_to_le32(ext_addr);
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desc->ext = cpu_to_le32(SOLO_P2M_COPY_SIZE(size >> 2));
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desc->ctrl = cpu_to_le32(SOLO_P2M_BURST_SIZE(SOLO_P2M_BURST_256) |
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(wr ? SOLO_P2M_WRITE : 0) | SOLO_P2M_TRANS_ON);
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/* Ext size only matters when we're repeating */
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if (repeat) {
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desc->ext |= cpu_to_le32(SOLO_P2M_EXT_INC(ext_size >> 2));
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desc->ctrl |= cpu_to_le32(SOLO_P2M_PCI_INC(size >> 2) |
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SOLO_P2M_REPEAT(repeat));
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}
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}
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int solo_p2m_dma_desc(struct solo_dev *solo_dev, u8 id,
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struct p2m_desc *desc, int desc_count)
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{
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struct solo_p2m_dev *p2m_dev;
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unsigned int timeout;
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int ret = 0;
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u32 config = 0;
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dma_addr_t desc_dma = 0;
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BUG_ON(id >= SOLO_NR_P2M);
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BUG_ON(!desc_count || desc_count > SOLO_NR_P2M_DESC);
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p2m_dev = &solo_dev->p2m_dev[id];
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mutex_lock(&p2m_dev->mutex);
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solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), 0);
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INIT_COMPLETION(p2m_dev->completion);
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p2m_dev->error = 0;
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/* Enable the descriptors */
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config = solo_reg_read(solo_dev, SOLO_P2M_CONFIG(id));
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desc_dma = pci_map_single(solo_dev->pdev, desc,
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desc_count * sizeof(*desc),
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PCI_DMA_TODEVICE);
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solo_reg_write(solo_dev, SOLO_P2M_DES_ADR(id), desc_dma);
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solo_reg_write(solo_dev, SOLO_P2M_DESC_ID(id), desc_count - 1);
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solo_reg_write(solo_dev, SOLO_P2M_CONFIG(id), config |
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SOLO_P2M_DESC_MODE);
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/* Should have all descriptors completed from one interrupt */
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timeout = wait_for_completion_timeout(&p2m_dev->completion, HZ);
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solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), 0);
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/* Reset back to non-descriptor mode */
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solo_reg_write(solo_dev, SOLO_P2M_CONFIG(id), config);
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solo_reg_write(solo_dev, SOLO_P2M_DESC_ID(id), 0);
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solo_reg_write(solo_dev, SOLO_P2M_DES_ADR(id), 0);
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pci_unmap_single(solo_dev->pdev, desc_dma,
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desc_count * sizeof(*desc),
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PCI_DMA_TODEVICE);
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if (p2m_dev->error)
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ret = -EIO;
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else if (timeout == 0)
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ret = -EAGAIN;
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mutex_unlock(&p2m_dev->mutex);
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WARN_ON_ONCE(ret);
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return ret;
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}
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int solo_p2m_dma_sg(struct solo_dev *solo_dev, u8 id,
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struct p2m_desc *pdesc, int wr,
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struct scatterlist *sg, u32 sg_off,
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u32 ext_addr, u32 size)
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{
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int i;
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int idx;
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BUG_ON(id >= SOLO_NR_P2M);
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if (WARN_ON_ONCE(!size))
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return -EINVAL;
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memset(pdesc, 0, sizeof(*pdesc));
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/* Should rewrite this to handle > SOLO_NR_P2M_DESC transactions */
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for (i = 0, idx = 1; idx < SOLO_NR_P2M_DESC && sg && size > 0;
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i++, sg = sg_next(sg)) {
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struct p2m_desc *desc = &pdesc[idx];
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u32 sg_len = sg_dma_len(sg);
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u32 len;
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if (sg_off >= sg_len) {
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sg_off -= sg_len;
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continue;
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}
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sg_len -= sg_off;
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len = min(sg_len, size);
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solo_p2m_push_desc(desc, wr, sg_dma_address(sg) + sg_off,
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ext_addr, len, 0, 0);
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size -= len;
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ext_addr += len;
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idx++;
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sg_off = 0;
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}
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WARN_ON_ONCE(size || i >= SOLO_NR_P2M_DESC);
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return solo_p2m_dma_desc(solo_dev, id, pdesc, idx);
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}
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#ifdef SOLO_TEST_P2M
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#define P2M_TEST_CHAR 0xbe
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static unsigned long long p2m_test(struct solo_dev *solo_dev, u8 id,
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u32 base, int size)
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{
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u8 *wr_buf;
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u8 *rd_buf;
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int i;
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unsigned long long err_cnt = 0;
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wr_buf = kmalloc(size, GFP_KERNEL);
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if (!wr_buf) {
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printk(SOLO6X10_NAME ": Failed to malloc for p2m_test\n");
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return size;
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}
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rd_buf = kmalloc(size, GFP_KERNEL);
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if (!rd_buf) {
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printk(SOLO6X10_NAME ": Failed to malloc for p2m_test\n");
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kfree(wr_buf);
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return size;
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}
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memset(wr_buf, P2M_TEST_CHAR, size);
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memset(rd_buf, P2M_TEST_CHAR + 1, size);
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solo_p2m_dma(solo_dev, id, 1, wr_buf, base, size);
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solo_p2m_dma(solo_dev, id, 0, rd_buf, base, size);
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for (i = 0; i < size; i++)
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if (wr_buf[i] != rd_buf[i])
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err_cnt++;
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kfree(wr_buf);
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kfree(rd_buf);
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return err_cnt;
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}
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#define TEST_CHUNK_SIZE (8 * 1024)
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static void run_p2m_test(struct solo_dev *solo_dev)
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{
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unsigned long long errs = 0;
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u32 size = SOLO_JPEG_EXT_ADDR(solo_dev) + SOLO_JPEG_EXT_SIZE(solo_dev);
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int i, d;
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printk(KERN_WARNING "%s: Testing %u bytes of external ram\n",
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SOLO6X10_NAME, size);
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for (i = 0; i < size; i += TEST_CHUNK_SIZE)
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for (d = 0; d < 4; d++)
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errs += p2m_test(solo_dev, d, i, TEST_CHUNK_SIZE);
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printk(KERN_WARNING "%s: Found %llu errors during p2m test\n",
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SOLO6X10_NAME, errs);
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return;
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}
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#else
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#define run_p2m_test(__solo) do {} while (0)
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#endif
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void solo_p2m_isr(struct solo_dev *solo_dev, int id)
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{
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struct solo_p2m_dev *p2m_dev = &solo_dev->p2m_dev[id];
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solo_reg_write(solo_dev, SOLO_IRQ_STAT, SOLO_IRQ_P2M(id));
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complete(&p2m_dev->completion);
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}
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void solo_p2m_error_isr(struct solo_dev *solo_dev, u32 status)
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{
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struct solo_p2m_dev *p2m_dev;
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int i;
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if (!(status & SOLO_PCI_ERR_P2M))
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return;
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for (i = 0; i < SOLO_NR_P2M; i++) {
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p2m_dev = &solo_dev->p2m_dev[i];
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p2m_dev->error = 1;
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solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
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complete(&p2m_dev->completion);
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}
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}
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void solo_p2m_exit(struct solo_dev *solo_dev)
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{
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int i;
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for (i = 0; i < SOLO_NR_P2M; i++)
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solo_irq_off(solo_dev, SOLO_IRQ_P2M(i));
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}
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int solo_p2m_init(struct solo_dev *solo_dev)
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{
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struct solo_p2m_dev *p2m_dev;
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int i;
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for (i = 0; i < SOLO_NR_P2M; i++) {
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p2m_dev = &solo_dev->p2m_dev[i];
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mutex_init(&p2m_dev->mutex);
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init_completion(&p2m_dev->completion);
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solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
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solo_reg_write(solo_dev, SOLO_P2M_CONFIG(i),
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SOLO_P2M_CSC_16BIT_565 |
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SOLO_P2M_DMA_INTERVAL(3) |
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SOLO_P2M_DESC_INTR_OPT |
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SOLO_P2M_PCI_MASTER_MODE);
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solo_irq_on(solo_dev, SOLO_IRQ_P2M(i));
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}
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run_p2m_test(solo_dev);
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return 0;
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}
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