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linux-sg2042/drivers/media/platform/atmel/atmel-isi.c

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/*
* Copyright (c) 2011 Atmel Corporation
* Josh Wu, <josh.wu@atmel.com>
*
* Based on previous work by Lars Haring, <lars.haring@atmel.com>
* and Sedji Gaouaou
* Based on the bttv driver for Bt848 with respective copyright holders
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/videodev2.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-event.h>
#include <media/v4l2-fwnode.h>
#include <media/videobuf2-dma-contig.h>
#include <media/v4l2-image-sizes.h>
#include "atmel-isi.h"
#define MAX_SUPPORT_WIDTH 2048U
#define MAX_SUPPORT_HEIGHT 2048U
#define MIN_FRAME_RATE 15
#define FRAME_INTERVAL_MILLI_SEC (1000 / MIN_FRAME_RATE)
/* Frame buffer descriptor */
struct fbd {
/* Physical address of the frame buffer */
u32 fb_address;
/* DMA Control Register(only in HISI2) */
u32 dma_ctrl;
/* Physical address of the next fbd */
u32 next_fbd_address;
};
static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl)
{
fb_desc->dma_ctrl = ctrl;
}
struct isi_dma_desc {
struct list_head list;
struct fbd *p_fbd;
dma_addr_t fbd_phys;
};
/* Frame buffer data */
struct frame_buffer {
struct vb2_v4l2_buffer vb;
struct isi_dma_desc *p_dma_desc;
struct list_head list;
};
struct isi_graph_entity {
struct device_node *node;
struct v4l2_async_subdev asd;
struct v4l2_subdev *subdev;
};
/*
* struct isi_format - ISI media bus format information
* @fourcc: Fourcc code for this format
* @mbus_code: V4L2 media bus format code.
* @bpp: Bytes per pixel (when stored in memory)
* @swap: Byte swap configuration value
* @support: Indicates format supported by subdev
* @skip: Skip duplicate format supported by subdev
*/
struct isi_format {
u32 fourcc;
u32 mbus_code;
u8 bpp;
u32 swap;
};
struct atmel_isi {
/* Protects the access of variables shared with the ISR */
spinlock_t irqlock;
struct device *dev;
void __iomem *regs;
int sequence;
/* Allocate descriptors for dma buffer use */
struct fbd *p_fb_descriptors;
dma_addr_t fb_descriptors_phys;
struct list_head dma_desc_head;
struct isi_dma_desc dma_desc[VIDEO_MAX_FRAME];
bool enable_preview_path;
struct completion complete;
/* ISI peripherial clock */
struct clk *pclk;
unsigned int irq;
struct isi_platform_data pdata;
u16 width_flags; /* max 12 bits */
struct list_head video_buffer_list;
struct frame_buffer *active;
struct v4l2_device v4l2_dev;
struct video_device *vdev;
struct v4l2_async_notifier notifier;
struct isi_graph_entity entity;
struct v4l2_format fmt;
const struct isi_format **user_formats;
unsigned int num_user_formats;
const struct isi_format *current_fmt;
struct mutex lock;
struct vb2_queue queue;
};
#define notifier_to_isi(n) container_of(n, struct atmel_isi, notifier)
static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
{
writel(val, isi->regs + reg);
}
static u32 isi_readl(struct atmel_isi *isi, u32 reg)
{
return readl(isi->regs + reg);
}
static void configure_geometry(struct atmel_isi *isi)
{
u32 cfg2, psize;
u32 fourcc = isi->current_fmt->fourcc;
isi->enable_preview_path = fourcc == V4L2_PIX_FMT_RGB565 ||
fourcc == V4L2_PIX_FMT_RGB32;
/* According to sensor's output format to set cfg2 */
cfg2 = isi->current_fmt->swap;
isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
/* Set width */
cfg2 |= ((isi->fmt.fmt.pix.width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
ISI_CFG2_IM_HSIZE_MASK;
/* Set height */
cfg2 |= ((isi->fmt.fmt.pix.height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
& ISI_CFG2_IM_VSIZE_MASK;
isi_writel(isi, ISI_CFG2, cfg2);
/* No down sampling, preview size equal to sensor output size */
psize = ((isi->fmt.fmt.pix.width - 1) << ISI_PSIZE_PREV_HSIZE_OFFSET) &
ISI_PSIZE_PREV_HSIZE_MASK;
psize |= ((isi->fmt.fmt.pix.height - 1) << ISI_PSIZE_PREV_VSIZE_OFFSET) &
ISI_PSIZE_PREV_VSIZE_MASK;
isi_writel(isi, ISI_PSIZE, psize);
isi_writel(isi, ISI_PDECF, ISI_PDECF_NO_SAMPLING);
}
static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
{
if (isi->active) {
struct vb2_v4l2_buffer *vbuf = &isi->active->vb;
struct frame_buffer *buf = isi->active;
list_del_init(&buf->list);
vbuf->vb2_buf.timestamp = ktime_get_ns();
vbuf->sequence = isi->sequence++;
vbuf->field = V4L2_FIELD_NONE;
vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
}
if (list_empty(&isi->video_buffer_list)) {
isi->active = NULL;
} else {
/* start next dma frame. */
isi->active = list_entry(isi->video_buffer_list.next,
struct frame_buffer, list);
if (!isi->enable_preview_path) {
isi_writel(isi, ISI_DMA_C_DSCR,
(u32)isi->active->p_dma_desc->fbd_phys);
isi_writel(isi, ISI_DMA_C_CTRL,
ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
} else {
isi_writel(isi, ISI_DMA_P_DSCR,
(u32)isi->active->p_dma_desc->fbd_phys);
isi_writel(isi, ISI_DMA_P_CTRL,
ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_P_CH);
}
}
return IRQ_HANDLED;
}
/* ISI interrupt service routine */
static irqreturn_t isi_interrupt(int irq, void *dev_id)
{
struct atmel_isi *isi = dev_id;
u32 status, mask, pending;
irqreturn_t ret = IRQ_NONE;
spin_lock(&isi->irqlock);
status = isi_readl(isi, ISI_STATUS);
mask = isi_readl(isi, ISI_INTMASK);
pending = status & mask;
if (pending & ISI_CTRL_SRST) {
complete(&isi->complete);
isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
ret = IRQ_HANDLED;
} else if (pending & ISI_CTRL_DIS) {
complete(&isi->complete);
isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
ret = IRQ_HANDLED;
} else {
if (likely(pending & ISI_SR_CXFR_DONE) ||
likely(pending & ISI_SR_PXFR_DONE))
ret = atmel_isi_handle_streaming(isi);
}
spin_unlock(&isi->irqlock);
return ret;
}
#define WAIT_ISI_RESET 1
#define WAIT_ISI_DISABLE 0
static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
{
unsigned long timeout;
/*
* The reset or disable will only succeed if we have a
* pixel clock from the camera.
*/
init_completion(&isi->complete);
if (wait_reset) {
isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
} else {
isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
}
timeout = wait_for_completion_timeout(&isi->complete,
msecs_to_jiffies(500));
if (timeout == 0)
return -ETIMEDOUT;
return 0;
}
/* ------------------------------------------------------------------
Videobuf operations
------------------------------------------------------------------*/
static int queue_setup(struct vb2_queue *vq,
unsigned int *nbuffers, unsigned int *nplanes,
unsigned int sizes[], struct device *alloc_devs[])
{
struct atmel_isi *isi = vb2_get_drv_priv(vq);
unsigned long size;
size = isi->fmt.fmt.pix.sizeimage;
/* Make sure the image size is large enough. */
if (*nplanes)
return sizes[0] < size ? -EINVAL : 0;
*nplanes = 1;
sizes[0] = size;
isi->active = NULL;
dev_dbg(isi->dev, "%s, count=%d, size=%ld\n", __func__,
*nbuffers, size);
return 0;
}
static int buffer_init(struct vb2_buffer *vb)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
buf->p_dma_desc = NULL;
INIT_LIST_HEAD(&buf->list);
return 0;
}
static int buffer_prepare(struct vb2_buffer *vb)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
struct atmel_isi *isi = vb2_get_drv_priv(vb->vb2_queue);
unsigned long size;
struct isi_dma_desc *desc;
size = isi->fmt.fmt.pix.sizeimage;
if (vb2_plane_size(vb, 0) < size) {
dev_err(isi->dev, "%s data will not fit into plane (%lu < %lu)\n",
__func__, vb2_plane_size(vb, 0), size);
return -EINVAL;
}
vb2_set_plane_payload(vb, 0, size);
if (!buf->p_dma_desc) {
if (list_empty(&isi->dma_desc_head)) {
dev_err(isi->dev, "Not enough dma descriptors.\n");
return -EINVAL;
} else {
/* Get an available descriptor */
desc = list_entry(isi->dma_desc_head.next,
struct isi_dma_desc, list);
/* Delete the descriptor since now it is used */
list_del_init(&desc->list);
/* Initialize the dma descriptor */
desc->p_fbd->fb_address =
vb2_dma_contig_plane_dma_addr(vb, 0);
desc->p_fbd->next_fbd_address = 0;
set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB);
buf->p_dma_desc = desc;
}
}
return 0;
}
static void buffer_cleanup(struct vb2_buffer *vb)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct atmel_isi *isi = vb2_get_drv_priv(vb->vb2_queue);
struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
/* This descriptor is available now and we add to head list */
if (buf->p_dma_desc)
list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
}
static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
{
u32 ctrl, cfg1;
cfg1 = isi_readl(isi, ISI_CFG1);
/* Enable irq: cxfr for the codec path, pxfr for the preview path */
isi_writel(isi, ISI_INTEN,
ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
/* Check if already in a frame */
if (!isi->enable_preview_path) {
if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
dev_err(isi->dev, "Already in frame handling.\n");
return;
}
isi_writel(isi, ISI_DMA_C_DSCR,
(u32)buffer->p_dma_desc->fbd_phys);
isi_writel(isi, ISI_DMA_C_CTRL,
ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
} else {
isi_writel(isi, ISI_DMA_P_DSCR,
(u32)buffer->p_dma_desc->fbd_phys);
isi_writel(isi, ISI_DMA_P_CTRL,
ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_P_CH);
}
cfg1 &= ~ISI_CFG1_FRATE_DIV_MASK;
/* Enable linked list */
cfg1 |= isi->pdata.frate | ISI_CFG1_DISCR;
/* Enable ISI */
ctrl = ISI_CTRL_EN;
if (!isi->enable_preview_path)
ctrl |= ISI_CTRL_CDC;
isi_writel(isi, ISI_CTRL, ctrl);
isi_writel(isi, ISI_CFG1, cfg1);
}
static void buffer_queue(struct vb2_buffer *vb)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct atmel_isi *isi = vb2_get_drv_priv(vb->vb2_queue);
struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
unsigned long flags = 0;
spin_lock_irqsave(&isi->irqlock, flags);
list_add_tail(&buf->list, &isi->video_buffer_list);
if (!isi->active) {
isi->active = buf;
if (vb2_is_streaming(vb->vb2_queue))
start_dma(isi, buf);
}
spin_unlock_irqrestore(&isi->irqlock, flags);
}
static int start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct atmel_isi *isi = vb2_get_drv_priv(vq);
struct frame_buffer *buf, *node;
int ret;
pm_runtime_get_sync(isi->dev);
/* Enable stream on the sub device */
ret = v4l2_subdev_call(isi->entity.subdev, video, s_stream, 1);
if (ret && ret != -ENOIOCTLCMD) {
dev_err(isi->dev, "stream on failed in subdev\n");
goto err_start_stream;
}
/* Reset ISI */
ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
if (ret < 0) {
dev_err(isi->dev, "Reset ISI timed out\n");
goto err_reset;
}
/* Disable all interrupts */
isi_writel(isi, ISI_INTDIS, (u32)~0UL);
isi->sequence = 0;
configure_geometry(isi);
spin_lock_irq(&isi->irqlock);
/* Clear any pending interrupt */
isi_readl(isi, ISI_STATUS);
start_dma(isi, isi->active);
spin_unlock_irq(&isi->irqlock);
return 0;
err_reset:
v4l2_subdev_call(isi->entity.subdev, video, s_stream, 0);
err_start_stream:
pm_runtime_put(isi->dev);
spin_lock_irq(&isi->irqlock);
isi->active = NULL;
/* Release all active buffers */
list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
list_del_init(&buf->list);
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
}
spin_unlock_irq(&isi->irqlock);
return ret;
}
/* abort streaming and wait for last buffer */
static void stop_streaming(struct vb2_queue *vq)
{
struct atmel_isi *isi = vb2_get_drv_priv(vq);
struct frame_buffer *buf, *node;
int ret = 0;
unsigned long timeout;
/* Disable stream on the sub device */
ret = v4l2_subdev_call(isi->entity.subdev, video, s_stream, 0);
if (ret && ret != -ENOIOCTLCMD)
dev_err(isi->dev, "stream off failed in subdev\n");
spin_lock_irq(&isi->irqlock);
isi->active = NULL;
/* Release all active buffers */
list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
list_del_init(&buf->list);
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
}
spin_unlock_irq(&isi->irqlock);
if (!isi->enable_preview_path) {
timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ;
/* Wait until the end of the current frame. */
while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
time_before(jiffies, timeout))
msleep(1);
if (time_after(jiffies, timeout))
dev_err(isi->dev,
"Timeout waiting for finishing codec request\n");
}
/* Disable interrupts */
isi_writel(isi, ISI_INTDIS,
ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
/* Disable ISI and wait for it is done */
ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
if (ret < 0)
dev_err(isi->dev, "Disable ISI timed out\n");
pm_runtime_put(isi->dev);
}
static const struct vb2_ops isi_video_qops = {
.queue_setup = queue_setup,
.buf_init = buffer_init,
.buf_prepare = buffer_prepare,
.buf_cleanup = buffer_cleanup,
.buf_queue = buffer_queue,
.start_streaming = start_streaming,
.stop_streaming = stop_streaming,
.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,
};
static int isi_g_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *fmt)
{
struct atmel_isi *isi = video_drvdata(file);
*fmt = isi->fmt;
return 0;
}
static const struct isi_format *find_format_by_fourcc(struct atmel_isi *isi,
unsigned int fourcc)
{
unsigned int num_formats = isi->num_user_formats;
const struct isi_format *fmt;
unsigned int i;
for (i = 0; i < num_formats; i++) {
fmt = isi->user_formats[i];
if (fmt->fourcc == fourcc)
return fmt;
}
return NULL;
}
static int isi_try_fmt(struct atmel_isi *isi, struct v4l2_format *f,
const struct isi_format **current_fmt)
{
const struct isi_format *isi_fmt;
struct v4l2_pix_format *pixfmt = &f->fmt.pix;
struct v4l2_subdev_pad_config pad_cfg;
struct v4l2_subdev_format format = {
.which = V4L2_SUBDEV_FORMAT_TRY,
};
int ret;
isi_fmt = find_format_by_fourcc(isi, pixfmt->pixelformat);
if (!isi_fmt) {
isi_fmt = isi->user_formats[isi->num_user_formats - 1];
pixfmt->pixelformat = isi_fmt->fourcc;
}
/* Limit to Atmel ISI hardware capabilities */
pixfmt->width = clamp(pixfmt->width, 0U, MAX_SUPPORT_WIDTH);
pixfmt->height = clamp(pixfmt->height, 0U, MAX_SUPPORT_HEIGHT);
v4l2_fill_mbus_format(&format.format, pixfmt, isi_fmt->mbus_code);
ret = v4l2_subdev_call(isi->entity.subdev, pad, set_fmt,
&pad_cfg, &format);
if (ret < 0)
return ret;
v4l2_fill_pix_format(pixfmt, &format.format);
pixfmt->field = V4L2_FIELD_NONE;
pixfmt->bytesperline = pixfmt->width * isi_fmt->bpp;
pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
if (current_fmt)
*current_fmt = isi_fmt;
return 0;
}
static int isi_set_fmt(struct atmel_isi *isi, struct v4l2_format *f)
{
struct v4l2_subdev_format format = {
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
};
const struct isi_format *current_fmt;
int ret;
ret = isi_try_fmt(isi, f, &current_fmt);
if (ret)
return ret;
v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
current_fmt->mbus_code);
ret = v4l2_subdev_call(isi->entity.subdev, pad,
set_fmt, NULL, &format);
if (ret < 0)
return ret;
isi->fmt = *f;
isi->current_fmt = current_fmt;
return 0;
}
static int isi_s_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct atmel_isi *isi = video_drvdata(file);
if (vb2_is_streaming(&isi->queue))
return -EBUSY;
return isi_set_fmt(isi, f);
}
static int isi_try_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct atmel_isi *isi = video_drvdata(file);
return isi_try_fmt(isi, f, NULL);
}
static int isi_enum_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_fmtdesc *f)
{
struct atmel_isi *isi = video_drvdata(file);
if (f->index >= isi->num_user_formats)
return -EINVAL;
f->pixelformat = isi->user_formats[f->index]->fourcc;
return 0;
}
static int isi_querycap(struct file *file, void *priv,
struct v4l2_capability *cap)
{
strlcpy(cap->driver, "atmel-isi", sizeof(cap->driver));
strlcpy(cap->card, "Atmel Image Sensor Interface", sizeof(cap->card));
strlcpy(cap->bus_info, "platform:isi", sizeof(cap->bus_info));
return 0;
}
static int isi_enum_input(struct file *file, void *priv,
struct v4l2_input *i)
{
if (i->index != 0)
return -EINVAL;
i->type = V4L2_INPUT_TYPE_CAMERA;
strlcpy(i->name, "Camera", sizeof(i->name));
return 0;
}
static int isi_g_input(struct file *file, void *priv, unsigned int *i)
{
*i = 0;
return 0;
}
static int isi_s_input(struct file *file, void *priv, unsigned int i)
{
if (i > 0)
return -EINVAL;
return 0;
}
static int isi_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
{
struct atmel_isi *isi = video_drvdata(file);
return v4l2_g_parm_cap(video_devdata(file), isi->entity.subdev, a);
}
static int isi_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
{
struct atmel_isi *isi = video_drvdata(file);
return v4l2_s_parm_cap(video_devdata(file), isi->entity.subdev, a);
}
static int isi_enum_framesizes(struct file *file, void *fh,
struct v4l2_frmsizeenum *fsize)
{
struct atmel_isi *isi = video_drvdata(file);
const struct isi_format *isi_fmt;
struct v4l2_subdev_frame_size_enum fse = {
.index = fsize->index,
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
};
int ret;
isi_fmt = find_format_by_fourcc(isi, fsize->pixel_format);
if (!isi_fmt)
return -EINVAL;
fse.code = isi_fmt->mbus_code;
ret = v4l2_subdev_call(isi->entity.subdev, pad, enum_frame_size,
NULL, &fse);
if (ret)
return ret;
fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
fsize->discrete.width = fse.max_width;
fsize->discrete.height = fse.max_height;
return 0;
}
static int isi_enum_frameintervals(struct file *file, void *fh,
struct v4l2_frmivalenum *fival)
{
struct atmel_isi *isi = video_drvdata(file);
const struct isi_format *isi_fmt;
struct v4l2_subdev_frame_interval_enum fie = {
.index = fival->index,
.width = fival->width,
.height = fival->height,
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
};
int ret;
isi_fmt = find_format_by_fourcc(isi, fival->pixel_format);
if (!isi_fmt)
return -EINVAL;
fie.code = isi_fmt->mbus_code;
ret = v4l2_subdev_call(isi->entity.subdev, pad,
enum_frame_interval, NULL, &fie);
if (ret)
return ret;
fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
fival->discrete = fie.interval;
return 0;
}
static void isi_camera_set_bus_param(struct atmel_isi *isi)
{
u32 cfg1 = 0;
/* set bus param for ISI */
if (isi->pdata.hsync_act_low)
cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
if (isi->pdata.vsync_act_low)
cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
if (isi->pdata.pclk_act_falling)
cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
if (isi->pdata.has_emb_sync)
cfg1 |= ISI_CFG1_EMB_SYNC;
if (isi->pdata.full_mode)
cfg1 |= ISI_CFG1_FULL_MODE;
cfg1 |= ISI_CFG1_THMASK_BEATS_16;
/* Enable PM and peripheral clock before operate isi registers */
pm_runtime_get_sync(isi->dev);
isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
isi_writel(isi, ISI_CFG1, cfg1);
pm_runtime_put(isi->dev);
}
/* -----------------------------------------------------------------------*/
static int atmel_isi_parse_dt(struct atmel_isi *isi,
struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct v4l2_fwnode_endpoint ep;
int err;
/* Default settings for ISI */
isi->pdata.full_mode = 1;
isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL;
np = of_graph_get_next_endpoint(np, NULL);
if (!np) {
dev_err(&pdev->dev, "Could not find the endpoint\n");
return -EINVAL;
}
err = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
of_node_put(np);
if (err) {
dev_err(&pdev->dev, "Could not parse the endpoint\n");
return err;
}
switch (ep.bus.parallel.bus_width) {
case 8:
isi->pdata.data_width_flags = ISI_DATAWIDTH_8;
break;
case 10:
isi->pdata.data_width_flags =
ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10;
break;
default:
dev_err(&pdev->dev, "Unsupported bus width: %d\n",
ep.bus.parallel.bus_width);
return -EINVAL;
}
if (ep.bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
isi->pdata.hsync_act_low = true;
if (ep.bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
isi->pdata.vsync_act_low = true;
if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
isi->pdata.pclk_act_falling = true;
if (ep.bus_type == V4L2_MBUS_BT656)
isi->pdata.has_emb_sync = true;
return 0;
}
static int isi_open(struct file *file)
{
struct atmel_isi *isi = video_drvdata(file);
struct v4l2_subdev *sd = isi->entity.subdev;
int ret;
if (mutex_lock_interruptible(&isi->lock))
return -ERESTARTSYS;
ret = v4l2_fh_open(file);
if (ret < 0)
goto unlock;
if (!v4l2_fh_is_singular_file(file))
goto fh_rel;
ret = v4l2_subdev_call(sd, core, s_power, 1);
if (ret < 0 && ret != -ENOIOCTLCMD)
goto fh_rel;
ret = isi_set_fmt(isi, &isi->fmt);
if (ret)
v4l2_subdev_call(sd, core, s_power, 0);
fh_rel:
if (ret)
v4l2_fh_release(file);
unlock:
mutex_unlock(&isi->lock);
return ret;
}
static int isi_release(struct file *file)
{
struct atmel_isi *isi = video_drvdata(file);
struct v4l2_subdev *sd = isi->entity.subdev;
bool fh_singular;
int ret;
mutex_lock(&isi->lock);
fh_singular = v4l2_fh_is_singular_file(file);
ret = _vb2_fop_release(file, NULL);
if (fh_singular)
v4l2_subdev_call(sd, core, s_power, 0);
mutex_unlock(&isi->lock);
return ret;
}
static const struct v4l2_ioctl_ops isi_ioctl_ops = {
.vidioc_querycap = isi_querycap,
.vidioc_try_fmt_vid_cap = isi_try_fmt_vid_cap,
.vidioc_g_fmt_vid_cap = isi_g_fmt_vid_cap,
.vidioc_s_fmt_vid_cap = isi_s_fmt_vid_cap,
.vidioc_enum_fmt_vid_cap = isi_enum_fmt_vid_cap,
.vidioc_enum_input = isi_enum_input,
.vidioc_g_input = isi_g_input,
.vidioc_s_input = isi_s_input,
.vidioc_g_parm = isi_g_parm,
.vidioc_s_parm = isi_s_parm,
.vidioc_enum_framesizes = isi_enum_framesizes,
.vidioc_enum_frameintervals = isi_enum_frameintervals,
.vidioc_reqbufs = vb2_ioctl_reqbufs,
.vidioc_create_bufs = vb2_ioctl_create_bufs,
.vidioc_querybuf = vb2_ioctl_querybuf,
.vidioc_qbuf = vb2_ioctl_qbuf,
.vidioc_dqbuf = vb2_ioctl_dqbuf,
.vidioc_expbuf = vb2_ioctl_expbuf,
.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
.vidioc_streamon = vb2_ioctl_streamon,
.vidioc_streamoff = vb2_ioctl_streamoff,
.vidioc_log_status = v4l2_ctrl_log_status,
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};
static const struct v4l2_file_operations isi_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = video_ioctl2,
.open = isi_open,
.release = isi_release,
.poll = vb2_fop_poll,
.mmap = vb2_fop_mmap,
.read = vb2_fop_read,
};
static int isi_set_default_fmt(struct atmel_isi *isi)
{
struct v4l2_format f = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.fmt.pix = {
.width = VGA_WIDTH,
.height = VGA_HEIGHT,
.field = V4L2_FIELD_NONE,
.pixelformat = isi->user_formats[0]->fourcc,
},
};
int ret;
ret = isi_try_fmt(isi, &f, NULL);
if (ret)
return ret;
isi->current_fmt = isi->user_formats[0];
isi->fmt = f;
return 0;
}
static const struct isi_format isi_formats[] = {
{
.fourcc = V4L2_PIX_FMT_YUYV,
.mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
.bpp = 2,
.swap = ISI_CFG2_YCC_SWAP_DEFAULT,
}, {
.fourcc = V4L2_PIX_FMT_YUYV,
.mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
.bpp = 2,
.swap = ISI_CFG2_YCC_SWAP_MODE_1,
}, {
.fourcc = V4L2_PIX_FMT_YUYV,
.mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
.bpp = 2,
.swap = ISI_CFG2_YCC_SWAP_MODE_2,
}, {
.fourcc = V4L2_PIX_FMT_YUYV,
.mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
.bpp = 2,
.swap = ISI_CFG2_YCC_SWAP_MODE_3,
}, {
.fourcc = V4L2_PIX_FMT_RGB565,
.mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
.bpp = 2,
.swap = ISI_CFG2_YCC_SWAP_MODE_2,
}, {
.fourcc = V4L2_PIX_FMT_RGB565,
.mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
.bpp = 2,
.swap = ISI_CFG2_YCC_SWAP_MODE_3,
}, {
.fourcc = V4L2_PIX_FMT_RGB565,
.mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
.bpp = 2,
.swap = ISI_CFG2_YCC_SWAP_DEFAULT,
}, {
.fourcc = V4L2_PIX_FMT_RGB565,
.mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
.bpp = 2,
.swap = ISI_CFG2_YCC_SWAP_MODE_1,
},
};
static int isi_formats_init(struct atmel_isi *isi)
{
const struct isi_format *isi_fmts[ARRAY_SIZE(isi_formats)];
unsigned int num_fmts = 0, i, j;
struct v4l2_subdev *subdev = isi->entity.subdev;
struct v4l2_subdev_mbus_code_enum mbus_code = {
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
};
while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
NULL, &mbus_code)) {
for (i = 0; i < ARRAY_SIZE(isi_formats); i++) {
if (isi_formats[i].mbus_code != mbus_code.code)
continue;
/* Code supported, have we got this fourcc yet? */
for (j = 0; j < num_fmts; j++)
if (isi_fmts[j]->fourcc == isi_formats[i].fourcc)
/* Already available */
break;
if (j == num_fmts)
/* new */
isi_fmts[num_fmts++] = isi_formats + i;
}
mbus_code.index++;
}
if (!num_fmts)
return -ENXIO;
isi->num_user_formats = num_fmts;
isi->user_formats = devm_kcalloc(isi->dev,
num_fmts, sizeof(struct isi_format *),
GFP_KERNEL);
if (!isi->user_formats)
return -ENOMEM;
memcpy(isi->user_formats, isi_fmts,
num_fmts * sizeof(struct isi_format *));
isi->current_fmt = isi->user_formats[0];
return 0;
}
static int isi_graph_notify_complete(struct v4l2_async_notifier *notifier)
{
struct atmel_isi *isi = notifier_to_isi(notifier);
int ret;
isi->vdev->ctrl_handler = isi->entity.subdev->ctrl_handler;
ret = isi_formats_init(isi);
if (ret) {
dev_err(isi->dev, "No supported mediabus format found\n");
return ret;
}
isi_camera_set_bus_param(isi);
ret = isi_set_default_fmt(isi);
if (ret) {
dev_err(isi->dev, "Could not set default format\n");
return ret;
}
ret = video_register_device(isi->vdev, VFL_TYPE_GRABBER, -1);
if (ret) {
dev_err(isi->dev, "Failed to register video device\n");
return ret;
}
dev_dbg(isi->dev, "Device registered as %s\n",
video_device_node_name(isi->vdev));
return 0;
}
static void isi_graph_notify_unbind(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *sd,
struct v4l2_async_subdev *asd)
{
struct atmel_isi *isi = notifier_to_isi(notifier);
dev_dbg(isi->dev, "Removing %s\n", video_device_node_name(isi->vdev));
/* Checks internaly if vdev have been init or not */
video_unregister_device(isi->vdev);
}
static int isi_graph_notify_bound(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *subdev,
struct v4l2_async_subdev *asd)
{
struct atmel_isi *isi = notifier_to_isi(notifier);
dev_dbg(isi->dev, "subdev %s bound\n", subdev->name);
isi->entity.subdev = subdev;
return 0;
}
static const struct v4l2_async_notifier_operations isi_graph_notify_ops = {
.bound = isi_graph_notify_bound,
.unbind = isi_graph_notify_unbind,
.complete = isi_graph_notify_complete,
};
static int isi_graph_parse(struct atmel_isi *isi, struct device_node *node)
{
struct device_node *ep = NULL;
struct device_node *remote;
ep = of_graph_get_next_endpoint(node, ep);
if (!ep)
return -EINVAL;
remote = of_graph_get_remote_port_parent(ep);
of_node_put(ep);
if (!remote)
return -EINVAL;
/* Remote node to connect */
isi->entity.node = remote;
isi->entity.asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
isi->entity.asd.match.fwnode = of_fwnode_handle(remote);
return 0;
}
static int isi_graph_init(struct atmel_isi *isi)
{
struct v4l2_async_subdev **subdevs = NULL;
int ret;
/* Parse the graph to extract a list of subdevice DT nodes. */
ret = isi_graph_parse(isi, isi->dev->of_node);
if (ret < 0) {
dev_err(isi->dev, "Graph parsing failed\n");
return ret;
}
/* Register the subdevices notifier. */
subdevs = devm_kzalloc(isi->dev, sizeof(*subdevs), GFP_KERNEL);
if (!subdevs) {
of_node_put(isi->entity.node);
return -ENOMEM;
}
subdevs[0] = &isi->entity.asd;
isi->notifier.subdevs = subdevs;
isi->notifier.num_subdevs = 1;
isi->notifier.ops = &isi_graph_notify_ops;
ret = v4l2_async_notifier_register(&isi->v4l2_dev, &isi->notifier);
if (ret < 0) {
dev_err(isi->dev, "Notifier registration failed\n");
of_node_put(isi->entity.node);
return ret;
}
return 0;
}
static int atmel_isi_probe(struct platform_device *pdev)
{
int irq;
struct atmel_isi *isi;
struct vb2_queue *q;
struct resource *regs;
int ret, i;
isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL);
if (!isi)
return -ENOMEM;
isi->pclk = devm_clk_get(&pdev->dev, "isi_clk");
if (IS_ERR(isi->pclk))
return PTR_ERR(isi->pclk);
ret = atmel_isi_parse_dt(isi, pdev);
if (ret)
return ret;
isi->active = NULL;
isi->dev = &pdev->dev;
mutex_init(&isi->lock);
spin_lock_init(&isi->irqlock);
INIT_LIST_HEAD(&isi->video_buffer_list);
INIT_LIST_HEAD(&isi->dma_desc_head);
q = &isi->queue;
/* Initialize the top-level structure */
ret = v4l2_device_register(&pdev->dev, &isi->v4l2_dev);
if (ret)
return ret;
isi->vdev = video_device_alloc();
if (!isi->vdev) {
ret = -ENOMEM;
goto err_vdev_alloc;
}
/* video node */
isi->vdev->fops = &isi_fops;
isi->vdev->v4l2_dev = &isi->v4l2_dev;
isi->vdev->queue = &isi->queue;
strlcpy(isi->vdev->name, KBUILD_MODNAME, sizeof(isi->vdev->name));
isi->vdev->release = video_device_release;
isi->vdev->ioctl_ops = &isi_ioctl_ops;
isi->vdev->lock = &isi->lock;
isi->vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
V4L2_CAP_READWRITE;
video_set_drvdata(isi->vdev, isi);
/* buffer queue */
q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
q->lock = &isi->lock;
q->drv_priv = isi;
q->buf_struct_size = sizeof(struct frame_buffer);
q->ops = &isi_video_qops;
q->mem_ops = &vb2_dma_contig_memops;
q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
q->min_buffers_needed = 2;
q->dev = &pdev->dev;
ret = vb2_queue_init(q);
if (ret < 0) {
dev_err(&pdev->dev, "failed to initialize VB2 queue\n");
goto err_vb2_queue;
}
isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
sizeof(struct fbd) * VIDEO_MAX_FRAME,
&isi->fb_descriptors_phys,
GFP_KERNEL);
if (!isi->p_fb_descriptors) {
dev_err(&pdev->dev, "Can't allocate descriptors!\n");
ret = -ENOMEM;
goto err_dma_alloc;
}
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
i * sizeof(struct fbd);
list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
}
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
isi->regs = devm_ioremap_resource(&pdev->dev, regs);
if (IS_ERR(isi->regs)) {
ret = PTR_ERR(isi->regs);
goto err_ioremap;
}
if (isi->pdata.data_width_flags & ISI_DATAWIDTH_8)
isi->width_flags = 1 << 7;
if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10)
isi->width_flags |= 1 << 9;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
ret = irq;
goto err_req_irq;
}
ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi);
if (ret) {
dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
goto err_req_irq;
}
isi->irq = irq;
ret = isi_graph_init(isi);
if (ret < 0)
goto err_req_irq;
pm_suspend_ignore_children(&pdev->dev, true);
pm_runtime_enable(&pdev->dev);
platform_set_drvdata(pdev, isi);
return 0;
err_req_irq:
err_ioremap:
dma_free_coherent(&pdev->dev,
sizeof(struct fbd) * VIDEO_MAX_FRAME,
isi->p_fb_descriptors,
isi->fb_descriptors_phys);
err_dma_alloc:
err_vb2_queue:
video_device_release(isi->vdev);
err_vdev_alloc:
v4l2_device_unregister(&isi->v4l2_dev);
return ret;
}
static int atmel_isi_remove(struct platform_device *pdev)
{
struct atmel_isi *isi = platform_get_drvdata(pdev);
dma_free_coherent(&pdev->dev,
sizeof(struct fbd) * VIDEO_MAX_FRAME,
isi->p_fb_descriptors,
isi->fb_descriptors_phys);
pm_runtime_disable(&pdev->dev);
v4l2_async_notifier_unregister(&isi->notifier);
v4l2_device_unregister(&isi->v4l2_dev);
return 0;
}
#ifdef CONFIG_PM
static int atmel_isi_runtime_suspend(struct device *dev)
{
struct atmel_isi *isi = dev_get_drvdata(dev);
clk_disable_unprepare(isi->pclk);
return 0;
}
static int atmel_isi_runtime_resume(struct device *dev)
{
struct atmel_isi *isi = dev_get_drvdata(dev);
return clk_prepare_enable(isi->pclk);
}
#endif /* CONFIG_PM */
static const struct dev_pm_ops atmel_isi_dev_pm_ops = {
SET_RUNTIME_PM_OPS(atmel_isi_runtime_suspend,
atmel_isi_runtime_resume, NULL)
};
static const struct of_device_id atmel_isi_of_match[] = {
{ .compatible = "atmel,at91sam9g45-isi" },
{ }
};
MODULE_DEVICE_TABLE(of, atmel_isi_of_match);
static struct platform_driver atmel_isi_driver = {
.driver = {
.name = "atmel_isi",
.of_match_table = of_match_ptr(atmel_isi_of_match),
.pm = &atmel_isi_dev_pm_ops,
},
.probe = atmel_isi_probe,
.remove = atmel_isi_remove,
};
module_platform_driver(atmel_isi_driver);
MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("video");
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