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linux/drivers/media/pci/tw68/tw68-core.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* tw68-core.c
* Core functions for the Techwell 68xx driver
*
* Much of this code is derived from the cx88 and sa7134 drivers, which
* were in turn derived from the bt87x driver. The original work was by
* Gerd Knorr; more recently the code was enhanced by Mauro Carvalho Chehab,
* Hans Verkuil, Andy Walls and many others. Their work is gratefully
* acknowledged. Full credit goes to them - any problems within this code
* are mine.
*
* Copyright (C) 2009 William M. Brack
*
* Refactored and updated to the latest v4l core frameworks:
*
* Copyright (C) 2014 Hans Verkuil <hverkuil@xs4all.nl>
*/
#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/mutex.h>
#include <linux/dma-mapping.h>
#include <linux/pci_ids.h>
#include <linux/pm.h>
#include <media/v4l2-dev.h>
#include "tw68.h"
#include "tw68-reg.h"
MODULE_DESCRIPTION("v4l2 driver module for tw6800 based video capture cards");
MODULE_AUTHOR("William M. Brack");
MODULE_AUTHOR("Hans Verkuil <hverkuil@xs4all.nl>");
MODULE_LICENSE("GPL");
static unsigned int latency = UNSET;
module_param(latency, int, 0444);
MODULE_PARM_DESC(latency, "pci latency timer");
static unsigned int video_nr[] = {[0 ... (TW68_MAXBOARDS - 1)] = UNSET };
module_param_array(video_nr, int, NULL, 0444);
MODULE_PARM_DESC(video_nr, "video device number");
static unsigned int card[] = {[0 ... (TW68_MAXBOARDS - 1)] = UNSET };
module_param_array(card, int, NULL, 0444);
MODULE_PARM_DESC(card, "card type");
static atomic_t tw68_instance = ATOMIC_INIT(0);
/* ------------------------------------------------------------------ */
/*
* 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 tw68_pci_tbl[] = {
{PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_TECHWELL_6800)},
{PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_TECHWELL_6801)},
{PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_TECHWELL_6804)},
{PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_TECHWELL_6816_1)},
{PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_TECHWELL_6816_2)},
{PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_TECHWELL_6816_3)},
{PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_TECHWELL_6816_4)},
{0,}
};
/* ------------------------------------------------------------------ */
/*
* The device is given a "soft reset". According to the specifications,
* after this "all register content remain unchanged", so we also write
* to all specified registers manually as well (mostly to manufacturer's
* specified reset values)
*/
static int tw68_hw_init1(struct tw68_dev *dev)
{
/* Assure all interrupts are disabled */
tw_writel(TW68_INTMASK, 0); /* 020 */
/* Clear any pending interrupts */
tw_writel(TW68_INTSTAT, 0xffffffff); /* 01C */
/* Stop risc processor, set default buffer level */
tw_writel(TW68_DMAC, 0x1600);
tw_writeb(TW68_ACNTL, 0x80); /* 218 soft reset */
msleep(100);
tw_writeb(TW68_INFORM, 0x40); /* 208 mux0, 27mhz xtal */
tw_writeb(TW68_OPFORM, 0x04); /* 20C analog line-lock */
tw_writeb(TW68_HSYNC, 0); /* 210 color-killer high sens */
tw_writeb(TW68_ACNTL, 0x42); /* 218 int vref #2, chroma adc off */
tw_writeb(TW68_CROP_HI, 0x02); /* 21C Hactive m.s. bits */
tw_writeb(TW68_VDELAY_LO, 0x12);/* 220 Mfg specified reset value */
tw_writeb(TW68_VACTIVE_LO, 0xf0);
tw_writeb(TW68_HDELAY_LO, 0x0f);
tw_writeb(TW68_HACTIVE_LO, 0xd0);
tw_writeb(TW68_CNTRL1, 0xcd); /* 230 Wide Chroma BPF B/W
* Secam reduction, Adap comb for
* NTSC, Op Mode 1 */
tw_writeb(TW68_VSCALE_LO, 0); /* 234 */
tw_writeb(TW68_SCALE_HI, 0x11); /* 238 */
tw_writeb(TW68_HSCALE_LO, 0); /* 23c */
tw_writeb(TW68_BRIGHT, 0); /* 240 */
tw_writeb(TW68_CONTRAST, 0x5c); /* 244 */
tw_writeb(TW68_SHARPNESS, 0x51);/* 248 */
tw_writeb(TW68_SAT_U, 0x80); /* 24C */
tw_writeb(TW68_SAT_V, 0x80); /* 250 */
tw_writeb(TW68_HUE, 0x00); /* 254 */
/* TODO - Check that none of these are set by control defaults */
tw_writeb(TW68_SHARP2, 0x53); /* 258 Mfg specified reset val */
tw_writeb(TW68_VSHARP, 0x80); /* 25C Sharpness Coring val 8 */
tw_writeb(TW68_CORING, 0x44); /* 260 CTI and Vert Peak coring */
tw_writeb(TW68_CNTRL2, 0x00); /* 268 No power saving enabled */
tw_writeb(TW68_SDT, 0x07); /* 270 Enable shadow reg, auto-det */
tw_writeb(TW68_SDTR, 0x7f); /* 274 All stds recog, don't start */
tw_writeb(TW68_CLMPG, 0x50); /* 280 Clamp end at 40 sys clocks */
tw_writeb(TW68_IAGC, 0x22); /* 284 Mfg specified reset val */
tw_writeb(TW68_AGCGAIN, 0xf0); /* 288 AGC gain when loop disabled */
tw_writeb(TW68_PEAKWT, 0xd8); /* 28C White peak threshold */
tw_writeb(TW68_CLMPL, 0x3c); /* 290 Y channel clamp level */
/* tw_writeb(TW68_SYNCT, 0x38);*/ /* 294 Sync amplitude */
tw_writeb(TW68_SYNCT, 0x30); /* 294 Sync amplitude */
tw_writeb(TW68_MISSCNT, 0x44); /* 298 Horiz sync, VCR detect sens */
tw_writeb(TW68_PCLAMP, 0x28); /* 29C Clamp pos from PLL sync */
/* Bit DETV of VCNTL1 helps sync multi cams/chip board */
tw_writeb(TW68_VCNTL1, 0x04); /* 2A0 */
tw_writeb(TW68_VCNTL2, 0); /* 2A4 */
tw_writeb(TW68_CKILL, 0x68); /* 2A8 Mfg specified reset val */
tw_writeb(TW68_COMB, 0x44); /* 2AC Mfg specified reset val */
tw_writeb(TW68_LDLY, 0x30); /* 2B0 Max positive luma delay */
tw_writeb(TW68_MISC1, 0x14); /* 2B4 Mfg specified reset val */
tw_writeb(TW68_LOOP, 0xa5); /* 2B8 Mfg specified reset val */
tw_writeb(TW68_MISC2, 0xe0); /* 2BC Enable colour killer */
tw_writeb(TW68_MVSN, 0); /* 2C0 */
tw_writeb(TW68_CLMD, 0x05); /* 2CC slice level auto, clamp med. */
tw_writeb(TW68_IDCNTL, 0); /* 2D0 Writing zero to this register
* selects NTSC ID detection,
* but doesn't change the
* sensitivity (which has a reset
* value of 1E). Since we are
* not doing auto-detection, it
* has no real effect */
tw_writeb(TW68_CLCNTL1, 0); /* 2D4 */
tw_writel(TW68_VBIC, 0x03); /* 010 */
tw_writel(TW68_CAP_CTL, 0x03); /* 040 Enable both even & odd flds */
tw_writel(TW68_DMAC, 0x2000); /* patch set had 0x2080 */
tw_writel(TW68_TESTREG, 0); /* 02C */
/*
* Some common boards, especially inexpensive single-chip models,
* use the GPIO bits 0-3 to control an on-board video-output mux.
* For these boards, we need to set up the GPIO register into
* "normal" mode, set bits 0-3 as output, and then set those bits
* zero.
*
* Eventually, it would be nice if we could identify these boards
* uniquely, and only do this initialisation if the board has been
* identify. For the moment, however, it shouldn't hurt anything
* to do these steps.
*/
tw_writel(TW68_GPIOC, 0); /* Set the GPIO to "normal", no ints */
tw_writel(TW68_GPOE, 0x0f); /* Set bits 0-3 to "output" */
tw_writel(TW68_GPDATA, 0); /* Set all bits to low state */
/* Initialize the device control structures */
mutex_init(&dev->lock);
spin_lock_init(&dev->slock);
/* Initialize any subsystems */
tw68_video_init1(dev);
return 0;
}
static irqreturn_t tw68_irq(int irq, void *dev_id)
{
struct tw68_dev *dev = dev_id;
u32 status, orig;
int loop;
status = orig = tw_readl(TW68_INTSTAT) & dev->pci_irqmask;
/* Check if anything to do */
if (0 == status)
return IRQ_NONE; /* Nope - return */
for (loop = 0; loop < 10; loop++) {
if (status & dev->board_virqmask) /* video interrupt */
tw68_irq_video_done(dev, status);
status = tw_readl(TW68_INTSTAT) & dev->pci_irqmask;
if (0 == status)
return IRQ_HANDLED;
}
dev_dbg(&dev->pci->dev, "%s: **** INTERRUPT NOT HANDLED - clearing mask (orig 0x%08x, cur 0x%08x)",
dev->name, orig, tw_readl(TW68_INTSTAT));
dev_dbg(&dev->pci->dev, "%s: pci_irqmask 0x%08x; board_virqmask 0x%08x ****\n",
dev->name, dev->pci_irqmask, dev->board_virqmask);
tw_clearl(TW68_INTMASK, dev->pci_irqmask);
return IRQ_HANDLED;
}
static int tw68_initdev(struct pci_dev *pci_dev,
const struct pci_device_id *pci_id)
{
struct tw68_dev *dev;
int vidnr = -1;
int err;
dev = devm_kzalloc(&pci_dev->dev, sizeof(*dev), GFP_KERNEL);
if (NULL == dev)
return -ENOMEM;
dev->instance = v4l2_device_set_name(&dev->v4l2_dev, "tw68",
&tw68_instance);
err = v4l2_device_register(&pci_dev->dev, &dev->v4l2_dev);
if (err)
return err;
/* pci init */
dev->pci = pci_dev;
if (pci_enable_device(pci_dev)) {
err = -EIO;
goto fail1;
}
dev->name = dev->v4l2_dev.name;
if (UNSET != latency) {
pr_info("%s: setting pci latency timer to %d\n",
dev->name, latency);
pci_write_config_byte(pci_dev, PCI_LATENCY_TIMER, latency);
}
/* print pci info */
pci_read_config_byte(pci_dev, PCI_CLASS_REVISION, &dev->pci_rev);
pci_read_config_byte(pci_dev, PCI_LATENCY_TIMER, &dev->pci_lat);
pr_info("%s: found at %s, rev: %d, irq: %d, latency: %d, mmio: 0x%llx\n",
dev->name, pci_name(pci_dev), dev->pci_rev, pci_dev->irq,
dev->pci_lat, (u64)pci_resource_start(pci_dev, 0));
pci_set_master(pci_dev);
err = pci_set_dma_mask(pci_dev, DMA_BIT_MASK(32));
if (err) {
pr_info("%s: Oops: no 32bit PCI DMA ???\n", dev->name);
goto fail1;
}
switch (pci_id->device) {
case PCI_DEVICE_ID_TECHWELL_6800: /* TW6800 */
dev->vdecoder = TW6800;
dev->board_virqmask = TW68_VID_INTS;
break;
case PCI_DEVICE_ID_TECHWELL_6801: /* Video decoder for TW6802 */
dev->vdecoder = TW6801;
dev->board_virqmask = TW68_VID_INTS | TW68_VID_INTSX;
break;
case PCI_DEVICE_ID_TECHWELL_6804: /* Video decoder for TW6804 */
dev->vdecoder = TW6804;
dev->board_virqmask = TW68_VID_INTS | TW68_VID_INTSX;
break;
default:
dev->vdecoder = TWXXXX; /* To be announced */
dev->board_virqmask = TW68_VID_INTS | TW68_VID_INTSX;
break;
}
/* get mmio */
if (!request_mem_region(pci_resource_start(pci_dev, 0),
pci_resource_len(pci_dev, 0),
dev->name)) {
err = -EBUSY;
pr_err("%s: can't get MMIO memory @ 0x%llx\n",
dev->name,
(unsigned long long)pci_resource_start(pci_dev, 0));
goto fail1;
}
dev->lmmio = ioremap(pci_resource_start(pci_dev, 0),
pci_resource_len(pci_dev, 0));
dev->bmmio = (__u8 __iomem *)dev->lmmio;
if (NULL == dev->lmmio) {
err = -EIO;
pr_err("%s: can't ioremap() MMIO memory\n",
dev->name);
goto fail2;
}
/* initialize hardware #1 */
/* Then do any initialisation wanted before interrupts are on */
tw68_hw_init1(dev);
/* get irq */
err = devm_request_irq(&pci_dev->dev, pci_dev->irq, tw68_irq,
IRQF_SHARED, dev->name, dev);
if (err < 0) {
pr_err("%s: can't get IRQ %d\n",
dev->name, pci_dev->irq);
goto fail3;
}
/*
* Now do remainder of initialisation, first for
* things unique for this card, then for general board
*/
if (dev->instance < TW68_MAXBOARDS)
vidnr = video_nr[dev->instance];
/* initialise video function first */
err = tw68_video_init2(dev, vidnr);
if (err < 0) {
pr_err("%s: can't register video device\n",
dev->name);
goto fail4;
}
tw_setl(TW68_INTMASK, dev->pci_irqmask);
pr_info("%s: registered device %s\n",
dev->name, video_device_node_name(&dev->vdev));
return 0;
fail4:
video_unregister_device(&dev->vdev);
fail3:
iounmap(dev->lmmio);
fail2:
release_mem_region(pci_resource_start(pci_dev, 0),
pci_resource_len(pci_dev, 0));
fail1:
v4l2_device_unregister(&dev->v4l2_dev);
return err;
}
static void tw68_finidev(struct pci_dev *pci_dev)
{
struct v4l2_device *v4l2_dev = pci_get_drvdata(pci_dev);
struct tw68_dev *dev =
container_of(v4l2_dev, struct tw68_dev, v4l2_dev);
/* shutdown subsystems */
tw_clearl(TW68_DMAC, TW68_DMAP_EN | TW68_FIFO_EN);
tw_writel(TW68_INTMASK, 0);
/* unregister */
video_unregister_device(&dev->vdev);
v4l2_ctrl_handler_free(&dev->hdl);
/* release resources */
iounmap(dev->lmmio);
release_mem_region(pci_resource_start(pci_dev, 0),
pci_resource_len(pci_dev, 0));
v4l2_device_unregister(&dev->v4l2_dev);
}
static int __maybe_unused tw68_suspend(struct device *dev_d)
{
struct pci_dev *pci_dev = to_pci_dev(dev_d);
struct v4l2_device *v4l2_dev = pci_get_drvdata(pci_dev);
struct tw68_dev *dev = container_of(v4l2_dev,
struct tw68_dev, v4l2_dev);
tw_clearl(TW68_DMAC, TW68_DMAP_EN | TW68_FIFO_EN);
dev->pci_irqmask &= ~TW68_VID_INTS;
tw_writel(TW68_INTMASK, 0);
synchronize_irq(pci_dev->irq);
vb2_discard_done(&dev->vidq);
return 0;
}
static int __maybe_unused tw68_resume(struct device *dev_d)
{
struct v4l2_device *v4l2_dev = dev_get_drvdata(dev_d);
struct tw68_dev *dev = container_of(v4l2_dev,
struct tw68_dev, v4l2_dev);
struct tw68_buf *buf;
unsigned long flags;
/* Do things that are done in tw68_initdev ,
except of initializing memory structures.*/
msleep(100);
tw68_set_tvnorm_hw(dev);
/*resume unfinished buffer(s)*/
spin_lock_irqsave(&dev->slock, flags);
buf = container_of(dev->active.next, struct tw68_buf, list);
tw68_video_start_dma(dev, buf);
spin_unlock_irqrestore(&dev->slock, flags);
return 0;
}
/* ----------------------------------------------------------- */
static SIMPLE_DEV_PM_OPS(tw68_pm_ops, tw68_suspend, tw68_resume);
static struct pci_driver tw68_pci_driver = {
.name = "tw68",
.id_table = tw68_pci_tbl,
.probe = tw68_initdev,
.remove = tw68_finidev,
.driver.pm = &tw68_pm_ops,
};
module_pci_driver(tw68_pci_driver);
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