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path: root/drivers/media/pci/saa7164/saa7164-buffer.c
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Diffstat (limited to 'drivers/media/pci/saa7164/saa7164-buffer.c')
-rw-r--r--drivers/media/pci/saa7164/saa7164-buffer.c322
1 files changed, 322 insertions, 0 deletions
diff --git a/drivers/media/pci/saa7164/saa7164-buffer.c b/drivers/media/pci/saa7164/saa7164-buffer.c
new file mode 100644
index 00000000000..66696fa8341
--- /dev/null
+++ b/drivers/media/pci/saa7164/saa7164-buffer.c
@@ -0,0 +1,322 @@
+/*
+ * 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);
+}
+
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