diff options
Diffstat (limited to 'drivers/media/pci/saa7164/saa7164-buffer.c')
| -rw-r--r-- | drivers/media/pci/saa7164/saa7164-buffer.c | 322 |
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 0000000..66696fa --- /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); +} + |