Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6: (222 commits)
  V4L/DVB (13033): pt1: Don't use a deprecated DMA_BIT_MASK macro
  V4L/DVB (13029): radio-si4713: remove #include <linux/version.h>
  V4L/DVB (13027): go7007: convert printks to v4l2_info
  V4L/DVB (13026): s2250-board: Implement brightness and contrast controls
  V4L/DVB (13025): s2250-board: Fix memory leaks
  V4L/DVB (13024): go7007: Implement vidioc_g_std and vidioc_querystd
  V4L/DVB (13023): go7007: Merge struct gofh and go declarations
  V4L/DVB (13022): go7007: Fix mpeg controls
  V4L/DVB (13021): go7007: Fix whitespace and line lengths
  V4L/DVB (13020): go7007: Updates to Kconfig and Makefile
  V4L/DVB (13019): video: initial support for ADV7180
  V4L/DVB (13018): kzalloc failure ignored in au8522_probe()
  V4L/DVB (13017): gspca: kmalloc failure ignored in sd_start()
  V4L/DVB (13016): kmalloc failure ignored in lgdt3304_attach() and s921_attach()
  V4L/DVB (13015): kmalloc failure ignored in m920x_firmware_download()
  V4L/DVB (13014): Add support for Compro VideoMate E800 (DVB-T part only)
  V4L/DVB (13013): FM TX: si4713: Kconfig: Fixed two typos.
  V4L/DVB (13012): uvc: introduce missing kfree
  V4L/DVB (13011): Change tuner type of BeholdTV cards
  V4L/DVB (13009): gspca - stv06xx-hdcs: Reduce exposure range
  ...

1 files changed, 155 insertions, 0 deletions

diff --git a/drivers/media/video/saa7164/saa7164-buffer.c b/drivers/media/video/saa7164/saa7164-buffer.c
new file mode 100644
index 00000000000..9ca5c83d165
--- /dev/null
+++ b/drivers/media/video/saa7164/saa7164-buffer.c
@@ -0,0 +1,155 @@
+/*
+ *  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%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 < 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;
+}
+