// SPDX-License-Identifier: GPL-2.0-or-later
|
/*
|
* TW5864 driver - core functions
|
*
|
* Copyright (C) 2016 Bluecherry, LLC <maintainers@bluecherrydvr.com>
|
*/
|
|
#include <linux/init.h>
|
#include <linux/list.h>
|
#include <linux/module.h>
|
#include <linux/kernel.h>
|
#include <linux/slab.h>
|
#include <linux/kmod.h>
|
#include <linux/sound.h>
|
#include <linux/interrupt.h>
|
#include <linux/delay.h>
|
#include <linux/dma-mapping.h>
|
#include <linux/pm.h>
|
#include <linux/pci_ids.h>
|
#include <linux/jiffies.h>
|
#include <asm/dma.h>
|
#include <media/v4l2-dev.h>
|
|
#include "tw5864.h"
|
#include "tw5864-reg.h"
|
|
MODULE_DESCRIPTION("V4L2 driver module for tw5864-based multimedia capture & encoding devices");
|
MODULE_AUTHOR("Bluecherry Maintainers <maintainers@bluecherrydvr.com>");
|
MODULE_AUTHOR("Andrey Utkin <andrey.utkin@corp.bluecherry.net>");
|
MODULE_LICENSE("GPL");
|
|
/*
|
* BEWARE OF KNOWN ISSUES WITH VIDEO QUALITY
|
*
|
* This driver was developed by Bluecherry LLC by deducing behaviour of
|
* original manufacturer's driver, from both source code and execution traces.
|
* It is known that there are some artifacts on output video with this driver:
|
* - on all known hardware samples: random pixels of wrong color (mostly
|
* white, red or blue) appearing and disappearing on sequences of P-frames;
|
* - on some hardware samples (known with H.264 core version e006:2800):
|
* total madness on P-frames: blocks of wrong luminance; blocks of wrong
|
* colors "creeping" across the picture.
|
* There is a workaround for both issues: avoid P-frames by setting GOP size
|
* to 1. To do that, run this command on device files created by this driver:
|
*
|
* v4l2-ctl --device /dev/videoX --set-ctrl=video_gop_size=1
|
*
|
* These issues are not decoding errors; all produced H.264 streams are decoded
|
* properly. Streams without P-frames don't have these artifacts so it's not
|
* analog-to-digital conversion issues nor internal memory errors; we conclude
|
* it's internal H.264 encoder issues.
|
* We cannot even check the original driver's behaviour because it has never
|
* worked properly at all in our development environment. So these issues may
|
* be actually related to firmware or hardware. However it may be that there's
|
* just some more register settings missing in the driver which would please
|
* the hardware.
|
* Manufacturer didn't help much on our inquiries, but feel free to disturb
|
* again the support of Intersil (owner of former Techwell).
|
*/
|
|
/* take first free /dev/videoX indexes by default */
|
static unsigned int video_nr[] = {[0 ... (TW5864_INPUTS - 1)] = -1 };
|
|
module_param_array(video_nr, int, NULL, 0444);
|
MODULE_PARM_DESC(video_nr, "video devices numbers array");
|
|
/*
|
* Please add any new PCI IDs to: https://pci-ids.ucw.cz. This keeps
|
* the PCI ID database up to date. Note that the entries must be
|
* added under vendor 0x1797 (Techwell Inc.) as subsystem IDs.
|
*/
|
static const struct pci_device_id tw5864_pci_tbl[] = {
|
{PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_TECHWELL_5864)},
|
{0,}
|
};
|
|
void tw5864_irqmask_apply(struct tw5864_dev *dev)
|
{
|
tw_writel(TW5864_INTR_ENABLE_L, dev->irqmask & 0xffff);
|
tw_writel(TW5864_INTR_ENABLE_H, (dev->irqmask >> 16));
|
}
|
|
static void tw5864_interrupts_disable(struct tw5864_dev *dev)
|
{
|
unsigned long flags;
|
|
spin_lock_irqsave(&dev->slock, flags);
|
dev->irqmask = 0;
|
tw5864_irqmask_apply(dev);
|
spin_unlock_irqrestore(&dev->slock, flags);
|
}
|
|
static void tw5864_timer_isr(struct tw5864_dev *dev);
|
static void tw5864_h264_isr(struct tw5864_dev *dev);
|
|
static irqreturn_t tw5864_isr(int irq, void *dev_id)
|
{
|
struct tw5864_dev *dev = dev_id;
|
u32 status;
|
|
status = tw_readl(TW5864_INTR_STATUS_L) |
|
tw_readl(TW5864_INTR_STATUS_H) << 16;
|
if (!status)
|
return IRQ_NONE;
|
|
tw_writel(TW5864_INTR_CLR_L, 0xffff);
|
tw_writel(TW5864_INTR_CLR_H, 0xffff);
|
|
if (status & TW5864_INTR_VLC_DONE)
|
tw5864_h264_isr(dev);
|
|
if (status & TW5864_INTR_TIMER)
|
tw5864_timer_isr(dev);
|
|
if (!(status & (TW5864_INTR_TIMER | TW5864_INTR_VLC_DONE))) {
|
dev_dbg(&dev->pci->dev, "Unknown interrupt, status 0x%08X\n",
|
status);
|
}
|
|
return IRQ_HANDLED;
|
}
|
|
static void tw5864_h264_isr(struct tw5864_dev *dev)
|
{
|
int channel = tw_readl(TW5864_DSP) & TW5864_DSP_ENC_CHN;
|
struct tw5864_input *input = &dev->inputs[channel];
|
int cur_frame_index, next_frame_index;
|
struct tw5864_h264_frame *cur_frame, *next_frame;
|
unsigned long flags;
|
|
spin_lock_irqsave(&dev->slock, flags);
|
|
cur_frame_index = dev->h264_buf_w_index;
|
next_frame_index = (cur_frame_index + 1) % H264_BUF_CNT;
|
cur_frame = &dev->h264_buf[cur_frame_index];
|
next_frame = &dev->h264_buf[next_frame_index];
|
|
if (next_frame_index != dev->h264_buf_r_index) {
|
cur_frame->vlc_len = tw_readl(TW5864_VLC_LENGTH) << 2;
|
cur_frame->checksum = tw_readl(TW5864_VLC_CRC_REG);
|
cur_frame->input = input;
|
cur_frame->timestamp = ktime_get_ns();
|
cur_frame->seqno = input->frame_seqno;
|
cur_frame->gop_seqno = input->frame_gop_seqno;
|
|
dev->h264_buf_w_index = next_frame_index;
|
tasklet_schedule(&dev->tasklet);
|
|
cur_frame = next_frame;
|
|
spin_lock(&input->slock);
|
input->frame_seqno++;
|
input->frame_gop_seqno++;
|
if (input->frame_gop_seqno >= input->gop)
|
input->frame_gop_seqno = 0;
|
spin_unlock(&input->slock);
|
} else {
|
dev_err(&dev->pci->dev,
|
"Skipped frame on input %d because all buffers busy\n",
|
channel);
|
}
|
|
dev->encoder_busy = 0;
|
|
spin_unlock_irqrestore(&dev->slock, flags);
|
|
tw_writel(TW5864_VLC_STREAM_BASE_ADDR, cur_frame->vlc.dma_addr);
|
tw_writel(TW5864_MV_STREAM_BASE_ADDR, cur_frame->mv.dma_addr);
|
|
/* Additional ack for this interrupt */
|
tw_writel(TW5864_VLC_DSP_INTR, 0x00000001);
|
tw_writel(TW5864_PCI_INTR_STATUS, TW5864_VLC_DONE_INTR);
|
}
|
|
static void tw5864_input_deadline_update(struct tw5864_input *input)
|
{
|
input->new_frame_deadline = jiffies + msecs_to_jiffies(1000);
|
}
|
|
static void tw5864_timer_isr(struct tw5864_dev *dev)
|
{
|
unsigned long flags;
|
int i;
|
int encoder_busy;
|
|
/* Additional ack for this interrupt */
|
tw_writel(TW5864_PCI_INTR_STATUS, TW5864_TIMER_INTR);
|
|
spin_lock_irqsave(&dev->slock, flags);
|
encoder_busy = dev->encoder_busy;
|
spin_unlock_irqrestore(&dev->slock, flags);
|
|
if (encoder_busy)
|
return;
|
|
/*
|
* Traversing inputs in round-robin fashion, starting from next to the
|
* last processed one
|
*/
|
for (i = 0; i < TW5864_INPUTS; i++) {
|
int next_input = (i + dev->next_input) % TW5864_INPUTS;
|
struct tw5864_input *input = &dev->inputs[next_input];
|
int raw_buf_id; /* id of internal buf with last raw frame */
|
|
spin_lock_irqsave(&input->slock, flags);
|
if (!input->enabled)
|
goto next;
|
|
/* Check if new raw frame is available */
|
raw_buf_id = tw_mask_shift_readl(TW5864_SENIF_ORG_FRM_PTR1, 0x3,
|
2 * input->nr);
|
|
if (input->buf_id != raw_buf_id) {
|
input->buf_id = raw_buf_id;
|
tw5864_input_deadline_update(input);
|
spin_unlock_irqrestore(&input->slock, flags);
|
|
spin_lock_irqsave(&dev->slock, flags);
|
dev->encoder_busy = 1;
|
dev->next_input = (next_input + 1) % TW5864_INPUTS;
|
spin_unlock_irqrestore(&dev->slock, flags);
|
|
tw5864_request_encoded_frame(input);
|
break;
|
}
|
|
/* No new raw frame; check if channel is stuck */
|
if (time_is_after_jiffies(input->new_frame_deadline)) {
|
/* If stuck, request new raw frames again */
|
tw_mask_shift_writel(TW5864_ENC_BUF_PTR_REC1, 0x3,
|
2 * input->nr, input->buf_id + 3);
|
tw5864_input_deadline_update(input);
|
}
|
next:
|
spin_unlock_irqrestore(&input->slock, flags);
|
}
|
}
|
|
static int tw5864_initdev(struct pci_dev *pci_dev,
|
const struct pci_device_id *pci_id)
|
{
|
struct tw5864_dev *dev;
|
int err;
|
|
dev = devm_kzalloc(&pci_dev->dev, sizeof(*dev), GFP_KERNEL);
|
if (!dev)
|
return -ENOMEM;
|
|
snprintf(dev->name, sizeof(dev->name), "tw5864:%s", pci_name(pci_dev));
|
|
err = v4l2_device_register(&pci_dev->dev, &dev->v4l2_dev);
|
if (err)
|
return err;
|
|
/* pci init */
|
dev->pci = pci_dev;
|
err = pci_enable_device(pci_dev);
|
if (err) {
|
dev_err(&dev->pci->dev, "pci_enable_device() failed\n");
|
goto unreg_v4l2;
|
}
|
|
pci_set_master(pci_dev);
|
|
err = pci_set_dma_mask(pci_dev, DMA_BIT_MASK(32));
|
if (err) {
|
dev_err(&dev->pci->dev, "32 bit PCI DMA is not supported\n");
|
goto disable_pci;
|
}
|
|
/* get mmio */
|
err = pci_request_regions(pci_dev, dev->name);
|
if (err) {
|
dev_err(&dev->pci->dev, "Cannot request regions for MMIO\n");
|
goto disable_pci;
|
}
|
dev->mmio = pci_ioremap_bar(pci_dev, 0);
|
if (!dev->mmio) {
|
err = -EIO;
|
dev_err(&dev->pci->dev, "can't ioremap() MMIO memory\n");
|
goto release_mmio;
|
}
|
|
spin_lock_init(&dev->slock);
|
|
dev_info(&pci_dev->dev, "TW5864 hardware version: %04x\n",
|
tw_readl(TW5864_HW_VERSION));
|
dev_info(&pci_dev->dev, "TW5864 H.264 core version: %04x:%04x\n",
|
tw_readl(TW5864_H264REV),
|
tw_readl(TW5864_UNDECLARED_H264REV_PART2));
|
|
err = tw5864_video_init(dev, video_nr);
|
if (err)
|
goto unmap_mmio;
|
|
/* get irq */
|
err = devm_request_irq(&pci_dev->dev, pci_dev->irq, tw5864_isr,
|
IRQF_SHARED, "tw5864", dev);
|
if (err < 0) {
|
dev_err(&dev->pci->dev, "can't get IRQ %d\n", pci_dev->irq);
|
goto fini_video;
|
}
|
|
dev_info(&pci_dev->dev, "Note: there are known video quality issues. For details\n");
|
dev_info(&pci_dev->dev, "see the comment in drivers/media/pci/tw5864/tw5864-core.c.\n");
|
|
return 0;
|
|
fini_video:
|
tw5864_video_fini(dev);
|
unmap_mmio:
|
iounmap(dev->mmio);
|
release_mmio:
|
pci_release_regions(pci_dev);
|
disable_pci:
|
pci_disable_device(pci_dev);
|
unreg_v4l2:
|
v4l2_device_unregister(&dev->v4l2_dev);
|
return err;
|
}
|
|
static void tw5864_finidev(struct pci_dev *pci_dev)
|
{
|
struct v4l2_device *v4l2_dev = pci_get_drvdata(pci_dev);
|
struct tw5864_dev *dev =
|
container_of(v4l2_dev, struct tw5864_dev, v4l2_dev);
|
|
/* shutdown subsystems */
|
tw5864_interrupts_disable(dev);
|
|
/* unregister */
|
tw5864_video_fini(dev);
|
|
/* release resources */
|
iounmap(dev->mmio);
|
release_mem_region(pci_resource_start(pci_dev, 0),
|
pci_resource_len(pci_dev, 0));
|
|
v4l2_device_unregister(&dev->v4l2_dev);
|
devm_kfree(&pci_dev->dev, dev);
|
}
|
|
static struct pci_driver tw5864_pci_driver = {
|
.name = "tw5864",
|
.id_table = tw5864_pci_tbl,
|
.probe = tw5864_initdev,
|
.remove = tw5864_finidev,
|
};
|
|
module_pci_driver(tw5864_pci_driver);
|
