156 lines
5.1 KiB
C
156 lines
5.1 KiB
C
/*
|
|
* Driver for the NXP SAA7164 PCIe bridge
|
|
*
|
|
* Copyright (c) 2009 Steven Toth <stoth@kernellabs.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
*
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include "saa7164.h"
|
|
|
|
/* The PCI address space for buffer handling looks like this:
|
|
|
|
+-u32 wide-------------+
|
|
| +
|
|
+-u64 wide------------------------------------+
|
|
+ +
|
|
+----------------------+
|
|
| CurrentBufferPtr + Pointer to current PCI buffer >-+
|
|
+----------------------+ |
|
|
| Unused + |
|
|
+----------------------+ |
|
|
| Pitch + = 188 (bytes) |
|
|
+----------------------+ |
|
|
| PCI buffer size + = pitch * number of lines (312) |
|
|
+----------------------+ |
|
|
|0| Buf0 Write Offset + |
|
|
+----------------------+ v
|
|
|1| Buf1 Write Offset + |
|
|
+----------------------+ |
|
|
|2| Buf2 Write Offset + |
|
|
+----------------------+ |
|
|
|3| Buf3 Write Offset + |
|
|
+----------------------+ |
|
|
... More write offsets |
|
|
+---------------------------------------------+ |
|
|
+0| set of ptrs to PCI pagetables + |
|
|
+---------------------------------------------+ |
|
|
+1| set of ptrs to PCI pagetables + <--------+
|
|
+---------------------------------------------+
|
|
+2| set of ptrs to PCI pagetables +
|
|
+---------------------------------------------+
|
|
+3| set of ptrs to PCI pagetables + >--+
|
|
+---------------------------------------------+ |
|
|
... More buffer pointers | +----------------+
|
|
+->| pt[0] TS data |
|
|
| +----------------+
|
|
|
|
|
| +----------------+
|
|
+->| pt[1] TS data |
|
|
| +----------------+
|
|
| etc
|
|
*/
|
|
|
|
/* Allocate a new buffer structure and associated PCI space in bytes.
|
|
* len must be a multiple of sizeof(u64)
|
|
*/
|
|
struct saa7164_buffer *saa7164_buffer_alloc(struct saa7164_tsport *port,
|
|
u32 len)
|
|
{
|
|
struct saa7164_buffer *buf = 0;
|
|
struct saa7164_dev *dev = port->dev;
|
|
int i;
|
|
|
|
if ((len == 0) || (len >= 65536) || (len % sizeof(u64))) {
|
|
log_warn("%s() SAA_ERR_BAD_PARAMETER\n", __func__);
|
|
goto ret;
|
|
}
|
|
|
|
buf = kzalloc(sizeof(struct saa7164_buffer), GFP_KERNEL);
|
|
if (buf == NULL) {
|
|
log_warn("%s() SAA_ERR_NO_RESOURCES\n", __func__);
|
|
goto ret;
|
|
}
|
|
|
|
buf->port = port;
|
|
buf->flags = SAA7164_BUFFER_FREE;
|
|
/* TODO: arg len is being ignored */
|
|
buf->pci_size = SAA7164_PT_ENTRIES * 0x1000;
|
|
buf->pt_size = (SAA7164_PT_ENTRIES * sizeof(u64)) + 0x1000;
|
|
|
|
/* Allocate contiguous memory */
|
|
buf->cpu = pci_alloc_consistent(port->dev->pci, buf->pci_size,
|
|
&buf->dma);
|
|
if (!buf->cpu)
|
|
goto fail1;
|
|
|
|
buf->pt_cpu = pci_alloc_consistent(port->dev->pci, buf->pt_size,
|
|
&buf->pt_dma);
|
|
if (!buf->pt_cpu)
|
|
goto fail2;
|
|
|
|
/* init the buffers to a known pattern, easier during debugging */
|
|
memset(buf->cpu, 0xff, buf->pci_size);
|
|
memset(buf->pt_cpu, 0xff, buf->pt_size);
|
|
|
|
dprintk(DBGLVL_BUF, "%s() allocated buffer @ 0x%p\n", __func__, buf);
|
|
dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%p len = 0x%x\n",
|
|
buf->cpu, (void *)buf->dma, buf->pci_size);
|
|
dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%p len = 0x%x\n",
|
|
buf->pt_cpu, (void *)buf->pt_dma, buf->pt_size);
|
|
|
|
/* Format the Page Table Entries to point into the data buffer */
|
|
for (i = 0 ; i < SAA7164_PT_ENTRIES; i++) {
|
|
|
|
*(buf->pt_cpu + i) = buf->dma + (i * 0x1000); /* TODO */
|
|
|
|
}
|
|
|
|
goto ret;
|
|
|
|
fail2:
|
|
pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
|
|
fail1:
|
|
kfree(buf);
|
|
|
|
buf = 0;
|
|
ret:
|
|
return buf;
|
|
}
|
|
|
|
int saa7164_buffer_dealloc(struct saa7164_tsport *port,
|
|
struct saa7164_buffer *buf)
|
|
{
|
|
struct saa7164_dev *dev = port->dev;
|
|
|
|
if ((buf == 0) || (port == 0))
|
|
return SAA_ERR_BAD_PARAMETER;
|
|
|
|
dprintk(DBGLVL_BUF, "%s() deallocating buffer @ 0x%p\n", __func__, buf);
|
|
|
|
if (buf->flags != SAA7164_BUFFER_FREE)
|
|
log_warn(" freeing a non-free buffer\n");
|
|
|
|
pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
|
|
pci_free_consistent(port->dev->pci, buf->pt_size, buf->pt_cpu,
|
|
buf->pt_dma);
|
|
|
|
kfree(buf);
|
|
|
|
return SAA_OK;
|
|
}
|
|
|