323 lines
9.7 KiB
C
323 lines
9.7 KiB
C
/*
|
|
* Driver for the NXP SAA7164 PCIe bridge
|
|
*
|
|
* Copyright (c) 2010 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 <linux/slab.h>
|
|
|
|
#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
|
|
*/
|
|
|
|
void saa7164_buffer_display(struct saa7164_buffer *buf)
|
|
{
|
|
struct saa7164_dev *dev = buf->port->dev;
|
|
int i;
|
|
|
|
dprintk(DBGLVL_BUF, "%s() buffer @ 0x%p nr=%d\n",
|
|
__func__, buf, buf->idx);
|
|
dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08llx len = 0x%x\n",
|
|
buf->cpu, (long long)buf->dma, buf->pci_size);
|
|
dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08llx len = 0x%x\n",
|
|
buf->pt_cpu, (long long)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++) {
|
|
|
|
dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n",
|
|
i, buf->pt_cpu, (u64)*(buf->pt_cpu));
|
|
|
|
}
|
|
}
|
|
/* 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_port *port,
|
|
u32 len)
|
|
{
|
|
struct tmHWStreamParameters *params = &port->hw_streamingparams;
|
|
struct saa7164_buffer *buf = NULL;
|
|
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) {
|
|
log_warn("%s() SAA_ERR_NO_RESOURCES\n", __func__);
|
|
goto ret;
|
|
}
|
|
|
|
buf->idx = -1;
|
|
buf->port = port;
|
|
buf->flags = SAA7164_BUFFER_FREE;
|
|
buf->pos = 0;
|
|
buf->actual_size = params->pitch * params->numberoflines;
|
|
buf->crc = 0;
|
|
/* 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_io(buf->cpu, 0xff, buf->pci_size);
|
|
buf->crc = crc32(0, buf->cpu, buf->actual_size);
|
|
memset_io(buf->pt_cpu, 0xff, buf->pt_size);
|
|
|
|
dprintk(DBGLVL_BUF, "%s() allocated buffer @ 0x%p (%d pageptrs)\n",
|
|
__func__, buf, params->numpagetables);
|
|
dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08lx len = 0x%x\n",
|
|
buf->cpu, (long)buf->dma, buf->pci_size);
|
|
dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08lx len = 0x%x\n",
|
|
buf->pt_cpu, (long)buf->pt_dma, buf->pt_size);
|
|
|
|
/* Format the Page Table Entries to point into the data buffer */
|
|
for (i = 0 ; i < params->numpagetables; i++) {
|
|
|
|
*(buf->pt_cpu + i) = buf->dma + (i * 0x1000); /* TODO */
|
|
dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n",
|
|
i, buf->pt_cpu, (u64)*(buf->pt_cpu));
|
|
|
|
}
|
|
|
|
goto ret;
|
|
|
|
fail2:
|
|
pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
|
|
fail1:
|
|
kfree(buf);
|
|
|
|
buf = NULL;
|
|
ret:
|
|
return buf;
|
|
}
|
|
|
|
int saa7164_buffer_dealloc(struct saa7164_buffer *buf)
|
|
{
|
|
struct saa7164_dev *dev;
|
|
|
|
if (!buf || !buf->port)
|
|
return SAA_ERR_BAD_PARAMETER;
|
|
dev = buf->port->dev;
|
|
|
|
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(dev->pci, buf->pci_size, buf->cpu, buf->dma);
|
|
pci_free_consistent(dev->pci, buf->pt_size, buf->pt_cpu, buf->pt_dma);
|
|
|
|
kfree(buf);
|
|
|
|
return SAA_OK;
|
|
}
|
|
|
|
int saa7164_buffer_zero_offsets(struct saa7164_port *port, int i)
|
|
{
|
|
struct saa7164_dev *dev = port->dev;
|
|
|
|
if ((i < 0) || (i >= port->hwcfg.buffercount))
|
|
return -EINVAL;
|
|
|
|
dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
|
|
|
|
saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Write a buffer into the hardware */
|
|
int saa7164_buffer_activate(struct saa7164_buffer *buf, int i)
|
|
{
|
|
struct saa7164_port *port = buf->port;
|
|
struct saa7164_dev *dev = port->dev;
|
|
|
|
if ((i < 0) || (i >= port->hwcfg.buffercount))
|
|
return -EINVAL;
|
|
|
|
dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
|
|
|
|
buf->idx = i; /* Note of which buffer list index position we occupy */
|
|
buf->flags = SAA7164_BUFFER_BUSY;
|
|
buf->pos = 0;
|
|
|
|
/* TODO: Review this in light of 32v64 assignments */
|
|
saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
|
|
saa7164_writel(port->bufptr32h + ((sizeof(u32) * 2) * i), buf->pt_dma);
|
|
saa7164_writel(port->bufptr32l + ((sizeof(u32) * 2) * i), 0);
|
|
|
|
dprintk(DBGLVL_BUF, " buf[%d] offset 0x%llx (0x%x) "
|
|
"buf 0x%llx/%llx (0x%x/%x) nr=%d\n",
|
|
buf->idx,
|
|
(u64)port->bufoffset + (i * sizeof(u32)),
|
|
saa7164_readl(port->bufoffset + (sizeof(u32) * i)),
|
|
(u64)port->bufptr32h + ((sizeof(u32) * 2) * i),
|
|
(u64)port->bufptr32l + ((sizeof(u32) * 2) * i),
|
|
saa7164_readl(port->bufptr32h + ((sizeof(u32) * i) * 2)),
|
|
saa7164_readl(port->bufptr32l + ((sizeof(u32) * i) * 2)),
|
|
buf->idx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int saa7164_buffer_cfg_port(struct saa7164_port *port)
|
|
{
|
|
struct tmHWStreamParameters *params = &port->hw_streamingparams;
|
|
struct saa7164_dev *dev = port->dev;
|
|
struct saa7164_buffer *buf;
|
|
struct list_head *c, *n;
|
|
int i = 0;
|
|
|
|
dprintk(DBGLVL_BUF, "%s(port=%d)\n", __func__, port->nr);
|
|
|
|
saa7164_writel(port->bufcounter, 0);
|
|
saa7164_writel(port->pitch, params->pitch);
|
|
saa7164_writel(port->bufsize, params->pitch * params->numberoflines);
|
|
|
|
dprintk(DBGLVL_BUF, " configured:\n");
|
|
dprintk(DBGLVL_BUF, " lmmio 0x%p\n", dev->lmmio);
|
|
dprintk(DBGLVL_BUF, " bufcounter 0x%x = 0x%x\n", port->bufcounter,
|
|
saa7164_readl(port->bufcounter));
|
|
|
|
dprintk(DBGLVL_BUF, " pitch 0x%x = %d\n", port->pitch,
|
|
saa7164_readl(port->pitch));
|
|
|
|
dprintk(DBGLVL_BUF, " bufsize 0x%x = %d\n", port->bufsize,
|
|
saa7164_readl(port->bufsize));
|
|
|
|
dprintk(DBGLVL_BUF, " buffercount = %d\n", port->hwcfg.buffercount);
|
|
dprintk(DBGLVL_BUF, " bufoffset = 0x%x\n", port->bufoffset);
|
|
dprintk(DBGLVL_BUF, " bufptr32h = 0x%x\n", port->bufptr32h);
|
|
dprintk(DBGLVL_BUF, " bufptr32l = 0x%x\n", port->bufptr32l);
|
|
|
|
/* Poke the buffers and offsets into PCI space */
|
|
mutex_lock(&port->dmaqueue_lock);
|
|
list_for_each_safe(c, n, &port->dmaqueue.list) {
|
|
buf = list_entry(c, struct saa7164_buffer, list);
|
|
|
|
if (buf->flags != SAA7164_BUFFER_FREE)
|
|
BUG();
|
|
|
|
/* Place the buffer in the h/w queue */
|
|
saa7164_buffer_activate(buf, i);
|
|
|
|
/* Don't exceed the device maximum # bufs */
|
|
if (i++ > port->hwcfg.buffercount)
|
|
BUG();
|
|
|
|
}
|
|
mutex_unlock(&port->dmaqueue_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct saa7164_user_buffer *saa7164_buffer_alloc_user(struct saa7164_dev *dev,
|
|
u32 len)
|
|
{
|
|
struct saa7164_user_buffer *buf;
|
|
|
|
buf = kzalloc(sizeof(struct saa7164_user_buffer), GFP_KERNEL);
|
|
if (!buf)
|
|
return NULL;
|
|
|
|
buf->data = kzalloc(len, GFP_KERNEL);
|
|
|
|
if (!buf->data) {
|
|
kfree(buf);
|
|
return NULL;
|
|
}
|
|
|
|
buf->actual_size = len;
|
|
buf->pos = 0;
|
|
buf->crc = 0;
|
|
|
|
dprintk(DBGLVL_BUF, "%s() allocated user buffer @ 0x%p\n",
|
|
__func__, buf);
|
|
|
|
return buf;
|
|
}
|
|
|
|
void saa7164_buffer_dealloc_user(struct saa7164_user_buffer *buf)
|
|
{
|
|
if (!buf)
|
|
return;
|
|
|
|
kfree(buf->data);
|
|
buf->data = NULL;
|
|
|
|
kfree(buf);
|
|
}
|
|
|