Commit 0d3244d6 authored by Magnus Damm's avatar Magnus Damm Committed by Mauro Carvalho Chehab
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V4L/DVB (8342): sh_mobile_ceu_camera: Add SuperH Mobile CEU driver V3



This is V3 of the SuperH Mobile CEU soc_camera driver.

The CEU hardware block is configured in a transparent data fetch
mode, frames are captured from the attached camera and written to
physically contiguous memory buffers provided by the newly added
videobuf-dma-contig queue. Tested on sh7722 and sh7723 processors.

 Changes since V2:
 - remove SUPERH Kconfig dependency
 - move sh_mobile_ceu.h to include/media
 - add board callback support with enable_camera()/disable_camera()
 - add support for declare_coherent_memory
 - rework video memory limit
 - more verbose error messages

 Changes since V1:
 - fixed the CEU driver to work with the newly updated patches
Signed-off-by: default avatarMagnus Damm <damm@igel.co.jp>
Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent 2cc45cf2
......@@ -969,4 +969,12 @@ config VIDEO_PXA27x
---help---
This is a v4l2 driver for the PXA27x Quick Capture Interface
config VIDEO_SH_MOBILE_CEU
tristate "SuperH Mobile CEU Interface driver"
depends on VIDEO_DEV
select SOC_CAMERA
select VIDEOBUF_DMA_CONTIG
---help---
This is a v4l2 driver for the SuperH Mobile CEU Interface
endif # VIDEO_CAPTURE_DRIVERS
......@@ -133,6 +133,7 @@ obj-$(CONFIG_VIDEO_VIVI) += vivi.o
obj-$(CONFIG_VIDEO_CX23885) += cx23885/
obj-$(CONFIG_VIDEO_PXA27x) += pxa_camera.o
obj-$(CONFIG_VIDEO_SH_MOBILE_CEU) += sh_mobile_ceu_camera.o
obj-$(CONFIG_SOC_CAMERA) += soc_camera.o
obj-$(CONFIG_SOC_CAMERA_MT9M001) += mt9m001.o
obj-$(CONFIG_SOC_CAMERA_MT9V022) += mt9v022.o
......
/*
* V4L2 Driver for SuperH Mobile CEU interface
*
* Copyright (C) 2008 Magnus Damm
*
* Based on V4L2 Driver for PXA camera host - "pxa_camera.c",
*
* Copyright (C) 2006, Sascha Hauer, Pengutronix
* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
*
* 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.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/moduleparam.h>
#include <linux/time.h>
#include <linux/version.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/v4l2-dev.h>
#include <media/soc_camera.h>
#include <media/sh_mobile_ceu.h>
#include <media/videobuf-dma-contig.h>
/* register offsets for sh7722 / sh7723 */
#define CAPSR 0x00
#define CAPCR 0x04
#define CAMCR 0x08
#define CMCYR 0x0c
#define CAMOR 0x10
#define CAPWR 0x14
#define CAIFR 0x18
#define CSTCR 0x20 /* not on sh7723 */
#define CSECR 0x24 /* not on sh7723 */
#define CRCNTR 0x28
#define CRCMPR 0x2c
#define CFLCR 0x30
#define CFSZR 0x34
#define CDWDR 0x38
#define CDAYR 0x3c
#define CDACR 0x40
#define CDBYR 0x44
#define CDBCR 0x48
#define CBDSR 0x4c
#define CFWCR 0x5c
#define CLFCR 0x60
#define CDOCR 0x64
#define CDDCR 0x68
#define CDDAR 0x6c
#define CEIER 0x70
#define CETCR 0x74
#define CSTSR 0x7c
#define CSRTR 0x80
#define CDSSR 0x84
#define CDAYR2 0x90
#define CDACR2 0x94
#define CDBYR2 0x98
#define CDBCR2 0x9c
static DEFINE_MUTEX(camera_lock);
/* per video frame buffer */
struct sh_mobile_ceu_buffer {
struct videobuf_buffer vb; /* v4l buffer must be first */
const struct soc_camera_data_format *fmt;
};
struct sh_mobile_ceu_dev {
struct device *dev;
struct soc_camera_host ici;
struct soc_camera_device *icd;
unsigned int irq;
void __iomem *base;
unsigned long video_limit;
spinlock_t lock;
struct list_head capture;
struct videobuf_buffer *active;
struct sh_mobile_ceu_info *pdata;
};
static void ceu_write(struct sh_mobile_ceu_dev *priv,
unsigned long reg_offs, unsigned long data)
{
iowrite32(data, priv->base + reg_offs);
}
static unsigned long ceu_read(struct sh_mobile_ceu_dev *priv,
unsigned long reg_offs)
{
return ioread32(priv->base + reg_offs);
}
/*
* Videobuf operations
*/
static int sh_mobile_ceu_videobuf_setup(struct videobuf_queue *vq,
unsigned int *count,
unsigned int *size)
{
struct soc_camera_device *icd = vq->priv_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct sh_mobile_ceu_dev *pcdev = ici->priv;
int bytes_per_pixel = (icd->current_fmt->depth + 7) >> 3;
*size = PAGE_ALIGN(icd->width * icd->height * bytes_per_pixel);
if (0 == *count)
*count = 2;
if (pcdev->video_limit) {
while (*size * *count > pcdev->video_limit)
(*count)--;
}
dev_dbg(&icd->dev, "count=%d, size=%d\n", *count, *size);
return 0;
}
static void free_buffer(struct videobuf_queue *vq,
struct sh_mobile_ceu_buffer *buf)
{
struct soc_camera_device *icd = vq->priv_data;
dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
&buf->vb, buf->vb.baddr, buf->vb.bsize);
if (in_interrupt())
BUG();
videobuf_dma_contig_free(vq, &buf->vb);
dev_dbg(&icd->dev, "%s freed\n", __func__);
buf->vb.state = VIDEOBUF_NEEDS_INIT;
}
static void sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
{
ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~1);
ceu_write(pcdev, CETCR, ~ceu_read(pcdev, CETCR) & 0x0317f313);
ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | 1);
ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~0x10000);
ceu_write(pcdev, CETCR, 0x0317f313 ^ 0x10);
if (pcdev->active) {
ceu_write(pcdev, CDAYR, videobuf_to_dma_contig(pcdev->active));
ceu_write(pcdev, CAPSR, 0x1); /* start capture */
}
}
static int sh_mobile_ceu_videobuf_prepare(struct videobuf_queue *vq,
struct videobuf_buffer *vb,
enum v4l2_field field)
{
struct soc_camera_device *icd = vq->priv_data;
struct sh_mobile_ceu_buffer *buf;
int ret;
buf = container_of(vb, struct sh_mobile_ceu_buffer, vb);
dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
vb, vb->baddr, vb->bsize);
/* Added list head initialization on alloc */
WARN_ON(!list_empty(&vb->queue));
#ifdef DEBUG
/* This can be useful if you want to see if we actually fill
* the buffer with something */
memset((void *)vb->baddr, 0xaa, vb->bsize);
#endif
BUG_ON(NULL == icd->current_fmt);
if (buf->fmt != icd->current_fmt ||
vb->width != icd->width ||
vb->height != icd->height ||
vb->field != field) {
buf->fmt = icd->current_fmt;
vb->width = icd->width;
vb->height = icd->height;
vb->field = field;
vb->state = VIDEOBUF_NEEDS_INIT;
}
vb->size = vb->width * vb->height * ((buf->fmt->depth + 7) >> 3);
if (0 != vb->baddr && vb->bsize < vb->size) {
ret = -EINVAL;
goto out;
}
if (vb->state == VIDEOBUF_NEEDS_INIT) {
ret = videobuf_iolock(vq, vb, NULL);
if (ret)
goto fail;
vb->state = VIDEOBUF_PREPARED;
}
return 0;
fail:
free_buffer(vq, buf);
out:
return ret;
}
static void sh_mobile_ceu_videobuf_queue(struct videobuf_queue *vq,
struct videobuf_buffer *vb)
{
struct soc_camera_device *icd = vq->priv_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct sh_mobile_ceu_dev *pcdev = ici->priv;
unsigned long flags;
dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
vb, vb->baddr, vb->bsize);
vb->state = VIDEOBUF_ACTIVE;
spin_lock_irqsave(&pcdev->lock, flags);
list_add_tail(&vb->queue, &pcdev->capture);
if (!pcdev->active) {
pcdev->active = vb;
sh_mobile_ceu_capture(pcdev);
}
spin_unlock_irqrestore(&pcdev->lock, flags);
}
static void sh_mobile_ceu_videobuf_release(struct videobuf_queue *vq,
struct videobuf_buffer *vb)
{
free_buffer(vq, container_of(vb, struct sh_mobile_ceu_buffer, vb));
}
static struct videobuf_queue_ops sh_mobile_ceu_videobuf_ops = {
.buf_setup = sh_mobile_ceu_videobuf_setup,
.buf_prepare = sh_mobile_ceu_videobuf_prepare,
.buf_queue = sh_mobile_ceu_videobuf_queue,
.buf_release = sh_mobile_ceu_videobuf_release,
};
static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
{
struct sh_mobile_ceu_dev *pcdev = data;
struct videobuf_buffer *vb;
unsigned long flags;
spin_lock_irqsave(&pcdev->lock, flags);
vb = pcdev->active;
list_del_init(&vb->queue);
if (!list_empty(&pcdev->capture))
pcdev->active = list_entry(pcdev->capture.next,
struct videobuf_buffer, queue);
else
pcdev->active = NULL;
sh_mobile_ceu_capture(pcdev);
vb->state = VIDEOBUF_DONE;
do_gettimeofday(&vb->ts);
vb->field_count++;
wake_up(&vb->done);
spin_unlock_irqrestore(&pcdev->lock, flags);
return IRQ_HANDLED;
}
static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct sh_mobile_ceu_dev *pcdev = ici->priv;
int ret = -EBUSY;
mutex_lock(&camera_lock);
if (pcdev->icd)
goto err;
dev_info(&icd->dev,
"SuperH Mobile CEU driver attached to camera %d\n",
icd->devnum);
if (pcdev->pdata->enable_camera)
pcdev->pdata->enable_camera();
ret = icd->ops->init(icd);
if (ret)
goto err;
ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
while (ceu_read(pcdev, CSTSR) & 1)
msleep(1);
pcdev->icd = icd;
err:
mutex_unlock(&camera_lock);
return ret;
}
static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct sh_mobile_ceu_dev *pcdev = ici->priv;
BUG_ON(icd != pcdev->icd);
/* disable capture, disable interrupts */
ceu_write(pcdev, CEIER, 0);
ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
icd->ops->release(icd);
if (pcdev->pdata->disable_camera)
pcdev->pdata->disable_camera();
dev_info(&icd->dev,
"SuperH Mobile CEU driver detached from camera %d\n",
icd->devnum);
pcdev->icd = NULL;
}
static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
__u32 pixfmt)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct sh_mobile_ceu_dev *pcdev = ici->priv;
int ret, buswidth, width, cfszr_width, cdwdr_width;
unsigned long camera_flags, common_flags, value;
camera_flags = icd->ops->query_bus_param(icd);
common_flags = soc_camera_bus_param_compatible(camera_flags,
pcdev->pdata->flags);
if (!common_flags)
return -EINVAL;
ret = icd->ops->set_bus_param(icd, common_flags);
if (ret < 0)
return ret;
switch (common_flags & SOCAM_DATAWIDTH_MASK) {
case SOCAM_DATAWIDTH_8:
buswidth = 8;
break;
case SOCAM_DATAWIDTH_16:
buswidth = 16;
break;
default:
return -EINVAL;
}
ceu_write(pcdev, CRCNTR, 0);
ceu_write(pcdev, CRCMPR, 0);
value = 0x00000010;
value |= (common_flags & SOCAM_VSYNC_ACTIVE_LOW) ? (1 << 1) : 0;
value |= (common_flags & SOCAM_HSYNC_ACTIVE_LOW) ? (1 << 0) : 0;
value |= (buswidth == 16) ? (1 << 12) : 0;
ceu_write(pcdev, CAMCR, value);
ceu_write(pcdev, CAPCR, 0x00300000);
ceu_write(pcdev, CAIFR, 0);
mdelay(1);
width = icd->width * (icd->current_fmt->depth / 8);
width = (buswidth == 16) ? width / 2 : width;
cfszr_width = (buswidth == 8) ? width / 2 : width;
cdwdr_width = (buswidth == 16) ? width * 2 : width;
ceu_write(pcdev, CAMOR, 0);
ceu_write(pcdev, CAPWR, (icd->height << 16) | width);
ceu_write(pcdev, CFLCR, 0); /* data fetch mode - no scaling */
ceu_write(pcdev, CFSZR, (icd->height << 16) | cfszr_width);
ceu_write(pcdev, CLFCR, 0); /* data fetch mode - no lowpass filter */
ceu_write(pcdev, CDOCR, 0x00000016);
ceu_write(pcdev, CDWDR, cdwdr_width);
ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
/* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
/* in data fetch mode: no need for CDACR, CDBYR, CDBCR */
return 0;
}
static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
__u32 pixfmt)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct sh_mobile_ceu_dev *pcdev = ici->priv;
unsigned long camera_flags, common_flags;
camera_flags = icd->ops->query_bus_param(icd);
common_flags = soc_camera_bus_param_compatible(camera_flags,
pcdev->pdata->flags);
if (!common_flags)
return -EINVAL;
return 0;
}
static int sh_mobile_ceu_set_fmt_cap(struct soc_camera_device *icd,
__u32 pixfmt, struct v4l2_rect *rect)
{
return icd->ops->set_fmt_cap(icd, pixfmt, rect);
}
static int sh_mobile_ceu_try_fmt_cap(struct soc_camera_device *icd,
struct v4l2_format *f)
{
/* FIXME: calculate using depth and bus width */
if (f->fmt.pix.height < 4)
f->fmt.pix.height = 4;
if (f->fmt.pix.height > 1920)
f->fmt.pix.height = 1920;
if (f->fmt.pix.width < 2)
f->fmt.pix.width = 2;
if (f->fmt.pix.width > 2560)
f->fmt.pix.width = 2560;
f->fmt.pix.width &= ~0x01;
f->fmt.pix.height &= ~0x03;
/* limit to sensor capabilities */
return icd->ops->try_fmt_cap(icd, f);
}
static int sh_mobile_ceu_reqbufs(struct soc_camera_file *icf,
struct v4l2_requestbuffers *p)
{
int i;
/* This is for locking debugging only. I removed spinlocks and now I
* check whether .prepare is ever called on a linked buffer, or whether
* a dma IRQ can occur for an in-work or unlinked buffer. Until now
* it hadn't triggered */
for (i = 0; i < p->count; i++) {
struct sh_mobile_ceu_buffer *buf;
buf = container_of(icf->vb_vidq.bufs[i],
struct sh_mobile_ceu_buffer, vb);
INIT_LIST_HEAD(&buf->vb.queue);
}
return 0;
}
static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
{
struct soc_camera_file *icf = file->private_data;
struct sh_mobile_ceu_buffer *buf;
buf = list_entry(icf->vb_vidq.stream.next,
struct sh_mobile_ceu_buffer, vb.stream);
poll_wait(file, &buf->vb.done, pt);
if (buf->vb.state == VIDEOBUF_DONE ||
buf->vb.state == VIDEOBUF_ERROR)
return POLLIN|POLLRDNORM;
return 0;
}
static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
struct v4l2_capability *cap)
{
strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
cap->version = KERNEL_VERSION(0, 0, 5);
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
return 0;
}
static void sh_mobile_ceu_init_videobuf(struct videobuf_queue *q,
struct soc_camera_device *icd)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct sh_mobile_ceu_dev *pcdev = ici->priv;
videobuf_queue_dma_contig_init(q,
&sh_mobile_ceu_videobuf_ops,
&ici->dev, &pcdev->lock,
V4L2_BUF_TYPE_VIDEO_CAPTURE,
V4L2_FIELD_NONE,
sizeof(struct sh_mobile_ceu_buffer),
icd);
}
static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
.owner = THIS_MODULE,
.add = sh_mobile_ceu_add_device,
.remove = sh_mobile_ceu_remove_device,
.set_fmt_cap = sh_mobile_ceu_set_fmt_cap,
.try_fmt_cap = sh_mobile_ceu_try_fmt_cap,
.reqbufs = sh_mobile_ceu_reqbufs,
.poll = sh_mobile_ceu_poll,
.querycap = sh_mobile_ceu_querycap,
.try_bus_param = sh_mobile_ceu_try_bus_param,
.set_bus_param = sh_mobile_ceu_set_bus_param,
.init_videobuf = sh_mobile_ceu_init_videobuf,
};
static int sh_mobile_ceu_probe(struct platform_device *pdev)
{
struct sh_mobile_ceu_dev *pcdev;
struct resource *res;
void __iomem *base;
unsigned int irq;
int err = 0;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_irq(pdev, 0);
if (!res || !irq) {
dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
err = -ENODEV;
goto exit;
}
pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
if (!pcdev) {
dev_err(&pdev->dev, "Could not allocate pcdev\n");
err = -ENOMEM;
goto exit;
}
platform_set_drvdata(pdev, pcdev);
INIT_LIST_HEAD(&pcdev->capture);
spin_lock_init(&pcdev->lock);
pcdev->pdata = pdev->dev.platform_data;
if (!pcdev->pdata) {
err = -EINVAL;
dev_err(&pdev->dev, "CEU platform data not set.\n");
goto exit_kfree;
}
base = ioremap_nocache(res->start, res->end - res->start + 1);
if (!base) {
err = -ENXIO;
dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
goto exit_kfree;
}
pcdev->irq = irq;
pcdev->base = base;
pcdev->video_limit = 0; /* only enabled if second resource exists */
pcdev->dev = &pdev->dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (res) {
err = dma_declare_coherent_memory(&pdev->dev, res->start,
res->start,
(res->end - res->start) + 1,
DMA_MEMORY_MAP |
DMA_MEMORY_EXCLUSIVE);
if (!err) {
dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
err = -ENXIO;
goto exit_iounmap;
}