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