mirror of https://gitee.com/openkylin/linux.git
158 lines
5.1 KiB
C
158 lines
5.1 KiB
C
/*
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* Driver for the NXP SAA7164 PCIe bridge
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*
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* Copyright (c) 2009 Steven Toth <stoth@kernellabs.com>
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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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*
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/slab.h>
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#include "saa7164.h"
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/* The PCI address space for buffer handling looks like this:
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+-u32 wide-------------+
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| +
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+-u64 wide------------------------------------+
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+ +
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+----------------------+
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| CurrentBufferPtr + Pointer to current PCI buffer >-+
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+----------------------+ |
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| Unused + |
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+----------------------+ |
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| Pitch + = 188 (bytes) |
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+----------------------+ |
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| PCI buffer size + = pitch * number of lines (312) |
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+----------------------+ |
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|0| Buf0 Write Offset + |
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+----------------------+ v
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|1| Buf1 Write Offset + |
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+----------------------+ |
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|2| Buf2 Write Offset + |
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+----------------------+ |
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|3| Buf3 Write Offset + |
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+----------------------+ |
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... More write offsets |
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+---------------------------------------------+ |
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+0| set of ptrs to PCI pagetables + |
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+---------------------------------------------+ |
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+1| set of ptrs to PCI pagetables + <--------+
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+---------------------------------------------+
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+2| set of ptrs to PCI pagetables +
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+---------------------------------------------+
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+3| set of ptrs to PCI pagetables + >--+
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+---------------------------------------------+ |
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... More buffer pointers | +----------------+
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+->| pt[0] TS data |
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| +----------------+
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| +----------------+
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+->| pt[1] TS data |
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| +----------------+
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| etc
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*/
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/* Allocate a new buffer structure and associated PCI space in bytes.
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* len must be a multiple of sizeof(u64)
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*/
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struct saa7164_buffer *saa7164_buffer_alloc(struct saa7164_tsport *port,
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u32 len)
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{
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struct saa7164_buffer *buf = 0;
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struct saa7164_dev *dev = port->dev;
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int i;
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if ((len == 0) || (len >= 65536) || (len % sizeof(u64))) {
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log_warn("%s() SAA_ERR_BAD_PARAMETER\n", __func__);
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goto ret;
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}
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buf = kzalloc(sizeof(struct saa7164_buffer), GFP_KERNEL);
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if (buf == NULL) {
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log_warn("%s() SAA_ERR_NO_RESOURCES\n", __func__);
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goto ret;
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}
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buf->port = port;
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buf->flags = SAA7164_BUFFER_FREE;
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/* TODO: arg len is being ignored */
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buf->pci_size = SAA7164_PT_ENTRIES * 0x1000;
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buf->pt_size = (SAA7164_PT_ENTRIES * sizeof(u64)) + 0x1000;
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/* Allocate contiguous memory */
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buf->cpu = pci_alloc_consistent(port->dev->pci, buf->pci_size,
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&buf->dma);
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if (!buf->cpu)
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goto fail1;
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buf->pt_cpu = pci_alloc_consistent(port->dev->pci, buf->pt_size,
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&buf->pt_dma);
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if (!buf->pt_cpu)
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goto fail2;
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/* init the buffers to a known pattern, easier during debugging */
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memset(buf->cpu, 0xff, buf->pci_size);
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memset(buf->pt_cpu, 0xff, buf->pt_size);
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dprintk(DBGLVL_BUF, "%s() allocated buffer @ 0x%p\n", __func__, buf);
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dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08lx len = 0x%x\n",
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buf->cpu, (long)buf->dma, buf->pci_size);
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dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08lx len = 0x%x\n",
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buf->pt_cpu, (long)buf->pt_dma, buf->pt_size);
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/* Format the Page Table Entries to point into the data buffer */
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for (i = 0 ; i < SAA7164_PT_ENTRIES; i++) {
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*(buf->pt_cpu + i) = buf->dma + (i * 0x1000); /* TODO */
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}
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goto ret;
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fail2:
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pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
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fail1:
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kfree(buf);
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buf = 0;
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ret:
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return buf;
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}
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int saa7164_buffer_dealloc(struct saa7164_tsport *port,
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struct saa7164_buffer *buf)
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{
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struct saa7164_dev *dev = port->dev;
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if ((buf == 0) || (port == 0))
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return SAA_ERR_BAD_PARAMETER;
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dprintk(DBGLVL_BUF, "%s() deallocating buffer @ 0x%p\n", __func__, buf);
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if (buf->flags != SAA7164_BUFFER_FREE)
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log_warn(" freeing a non-free buffer\n");
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pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
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pci_free_consistent(port->dev->pci, buf->pt_size, buf->pt_cpu,
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buf->pt_dma);
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kfree(buf);
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return SAA_OK;
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}
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