aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/platform/mx1_camera.c
diff options
context:
space:
mode:
authorMauro Carvalho Chehab <mchehab@redhat.com>2012-08-14 17:31:16 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-08-15 16:43:09 -0300
commit2c3fb08b3f74b8792004095a1f6881a3296ff643 (patch)
tree19be9d09c4aa66d4363ee9d38a43721f5d6b144f /drivers/media/platform/mx1_camera.c
parent2a2d1cf46500ab7599d0b45ee837f3936763ccac (diff)
[media] rename drivers/media/video as .../platform
The remaining drivers are mostly platform drivers. Name the dir to reflect it. It makes sense to latter break it into a few other dirs. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/platform/mx1_camera.c')
-rw-r--r--drivers/media/platform/mx1_camera.c889
1 files changed, 889 insertions, 0 deletions
diff --git a/drivers/media/platform/mx1_camera.c b/drivers/media/platform/mx1_camera.c
new file mode 100644
index 000000000000..d2e6f82ecfac
--- /dev/null
+++ b/drivers/media/platform/mx1_camera.c
@@ -0,0 +1,889 @@
+/*
+ * V4L2 Driver for i.MXL/i.MXL camera (CSI) host
+ *
+ * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
+ * Copyright (C) 2009, Darius Augulis <augulis.darius@gmail.com>
+ *
+ * Based on PXA SoC camera driver
+ * 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 version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/videodev2.h>
+
+#include <media/soc_camera.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-dev.h>
+#include <media/videobuf-dma-contig.h>
+#include <media/soc_mediabus.h>
+
+#include <asm/dma.h>
+#include <asm/fiq.h>
+#include <mach/dma-mx1-mx2.h>
+#include <mach/hardware.h>
+#include <mach/irqs.h>
+#include <mach/mx1_camera.h>
+
+/*
+ * CSI registers
+ */
+#define CSICR1 0x00 /* CSI Control Register 1 */
+#define CSISR 0x08 /* CSI Status Register */
+#define CSIRXR 0x10 /* CSI RxFIFO Register */
+
+#define CSICR1_RXFF_LEVEL(x) (((x) & 0x3) << 19)
+#define CSICR1_SOF_POL (1 << 17)
+#define CSICR1_SOF_INTEN (1 << 16)
+#define CSICR1_MCLKDIV(x) (((x) & 0xf) << 12)
+#define CSICR1_MCLKEN (1 << 9)
+#define CSICR1_FCC (1 << 8)
+#define CSICR1_BIG_ENDIAN (1 << 7)
+#define CSICR1_CLR_RXFIFO (1 << 5)
+#define CSICR1_GCLK_MODE (1 << 4)
+#define CSICR1_DATA_POL (1 << 2)
+#define CSICR1_REDGE (1 << 1)
+#define CSICR1_EN (1 << 0)
+
+#define CSISR_SFF_OR_INT (1 << 25)
+#define CSISR_RFF_OR_INT (1 << 24)
+#define CSISR_STATFF_INT (1 << 21)
+#define CSISR_RXFF_INT (1 << 18)
+#define CSISR_SOF_INT (1 << 16)
+#define CSISR_DRDY (1 << 0)
+
+#define DRIVER_VERSION "0.0.2"
+#define DRIVER_NAME "mx1-camera"
+
+#define CSI_IRQ_MASK (CSISR_SFF_OR_INT | CSISR_RFF_OR_INT | \
+ CSISR_STATFF_INT | CSISR_RXFF_INT | CSISR_SOF_INT)
+
+#define CSI_BUS_FLAGS (V4L2_MBUS_MASTER | V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
+ V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW | \
+ V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING | \
+ V4L2_MBUS_DATA_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_LOW)
+
+#define MAX_VIDEO_MEM 16 /* Video memory limit in megabytes */
+
+/*
+ * Structures
+ */
+
+/* buffer for one video frame */
+struct mx1_buffer {
+ /* common v4l buffer stuff -- must be first */
+ struct videobuf_buffer vb;
+ enum v4l2_mbus_pixelcode code;
+ int inwork;
+};
+
+/*
+ * i.MX1/i.MXL is only supposed to handle one camera on its Camera Sensor
+ * Interface. If anyone ever builds hardware to enable more than
+ * one camera, they will have to modify this driver too
+ */
+struct mx1_camera_dev {
+ struct soc_camera_host soc_host;
+ struct soc_camera_device *icd;
+ struct mx1_camera_pdata *pdata;
+ struct mx1_buffer *active;
+ struct resource *res;
+ struct clk *clk;
+ struct list_head capture;
+
+ void __iomem *base;
+ int dma_chan;
+ unsigned int irq;
+ unsigned long mclk;
+
+ spinlock_t lock;
+};
+
+/*
+ * Videobuf operations
+ */
+static int mx1_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
+ unsigned int *size)
+{
+ struct soc_camera_device *icd = vq->priv_data;
+
+ *size = icd->sizeimage;
+
+ if (!*count)
+ *count = 32;
+
+ if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
+ *count = (MAX_VIDEO_MEM * 1024 * 1024) / *size;
+
+ dev_dbg(icd->parent, "count=%d, size=%d\n", *count, *size);
+
+ return 0;
+}
+
+static void free_buffer(struct videobuf_queue *vq, struct mx1_buffer *buf)
+{
+ struct soc_camera_device *icd = vq->priv_data;
+ struct videobuf_buffer *vb = &buf->vb;
+
+ BUG_ON(in_interrupt());
+
+ dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
+ vb, vb->baddr, vb->bsize);
+
+ /*
+ * This waits until this buffer is out of danger, i.e., until it is no
+ * longer in STATE_QUEUED or STATE_ACTIVE
+ */
+ videobuf_waiton(vq, vb, 0, 0);
+ videobuf_dma_contig_free(vq, vb);
+
+ vb->state = VIDEOBUF_NEEDS_INIT;
+}
+
+static int mx1_videobuf_prepare(struct videobuf_queue *vq,
+ struct videobuf_buffer *vb, enum v4l2_field field)
+{
+ struct soc_camera_device *icd = vq->priv_data;
+ struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
+ int ret;
+
+ dev_dbg(icd->parent, "%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));
+
+ BUG_ON(NULL == icd->current_fmt);
+
+ /*
+ * I think, in buf_prepare you only have to protect global data,
+ * the actual buffer is yours
+ */
+ buf->inwork = 1;
+
+ if (buf->code != icd->current_fmt->code ||
+ vb->width != icd->user_width ||
+ vb->height != icd->user_height ||
+ vb->field != field) {
+ buf->code = icd->current_fmt->code;
+ vb->width = icd->user_width;
+ vb->height = icd->user_height;
+ vb->field = field;
+ vb->state = VIDEOBUF_NEEDS_INIT;
+ }
+
+ vb->size = icd->sizeimage;
+ 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;
+ }
+
+ buf->inwork = 0;
+
+ return 0;
+
+fail:
+ free_buffer(vq, buf);
+out:
+ buf->inwork = 0;
+ return ret;
+}
+
+static int mx1_camera_setup_dma(struct mx1_camera_dev *pcdev)
+{
+ struct videobuf_buffer *vbuf = &pcdev->active->vb;
+ struct device *dev = pcdev->icd->parent;
+ int ret;
+
+ if (unlikely(!pcdev->active)) {
+ dev_err(dev, "DMA End IRQ with no active buffer\n");
+ return -EFAULT;
+ }
+
+ /* setup sg list for future DMA */
+ ret = imx_dma_setup_single(pcdev->dma_chan,
+ videobuf_to_dma_contig(vbuf),
+ vbuf->size, pcdev->res->start +
+ CSIRXR, DMA_MODE_READ);
+ if (unlikely(ret))
+ dev_err(dev, "Failed to setup DMA sg list\n");
+
+ return ret;
+}
+
+/* Called under spinlock_irqsave(&pcdev->lock, ...) */
+static void mx1_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->parent);
+ struct mx1_camera_dev *pcdev = ici->priv;
+ struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
+
+ dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
+ vb, vb->baddr, vb->bsize);
+
+ list_add_tail(&vb->queue, &pcdev->capture);
+
+ vb->state = VIDEOBUF_ACTIVE;
+
+ if (!pcdev->active) {
+ pcdev->active = buf;
+
+ /* setup sg list for future DMA */
+ if (!mx1_camera_setup_dma(pcdev)) {
+ unsigned int temp;
+ /* enable SOF irq */
+ temp = __raw_readl(pcdev->base + CSICR1) |
+ CSICR1_SOF_INTEN;
+ __raw_writel(temp, pcdev->base + CSICR1);
+ }
+ }
+}
+
+static void mx1_videobuf_release(struct videobuf_queue *vq,
+ struct videobuf_buffer *vb)
+{
+ struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
+#ifdef DEBUG
+ struct soc_camera_device *icd = vq->priv_data;
+ struct device *dev = icd->parent;
+
+ dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
+ vb, vb->baddr, vb->bsize);
+
+ switch (vb->state) {
+ case VIDEOBUF_ACTIVE:
+ dev_dbg(dev, "%s (active)\n", __func__);
+ break;
+ case VIDEOBUF_QUEUED:
+ dev_dbg(dev, "%s (queued)\n", __func__);
+ break;
+ case VIDEOBUF_PREPARED:
+ dev_dbg(dev, "%s (prepared)\n", __func__);
+ break;
+ default:
+ dev_dbg(dev, "%s (unknown)\n", __func__);
+ break;
+ }
+#endif
+
+ free_buffer(vq, buf);
+}
+
+static void mx1_camera_wakeup(struct mx1_camera_dev *pcdev,
+ struct videobuf_buffer *vb,
+ struct mx1_buffer *buf)
+{
+ /* _init is used to debug races, see comment in mx1_camera_reqbufs() */
+ list_del_init(&vb->queue);
+ vb->state = VIDEOBUF_DONE;
+ do_gettimeofday(&vb->ts);
+ vb->field_count++;
+ wake_up(&vb->done);
+
+ if (list_empty(&pcdev->capture)) {
+ pcdev->active = NULL;
+ return;
+ }
+
+ pcdev->active = list_entry(pcdev->capture.next,
+ struct mx1_buffer, vb.queue);
+
+ /* setup sg list for future DMA */
+ if (likely(!mx1_camera_setup_dma(pcdev))) {
+ unsigned int temp;
+
+ /* enable SOF irq */
+ temp = __raw_readl(pcdev->base + CSICR1) | CSICR1_SOF_INTEN;
+ __raw_writel(temp, pcdev->base + CSICR1);
+ }
+}
+
+static void mx1_camera_dma_irq(int channel, void *data)
+{
+ struct mx1_camera_dev *pcdev = data;
+ struct device *dev = pcdev->icd->parent;
+ struct mx1_buffer *buf;
+ struct videobuf_buffer *vb;
+ unsigned long flags;
+
+ spin_lock_irqsave(&pcdev->lock, flags);
+
+ imx_dma_disable(channel);
+
+ if (unlikely(!pcdev->active)) {
+ dev_err(dev, "DMA End IRQ with no active buffer\n");
+ goto out;
+ }
+
+ vb = &pcdev->active->vb;
+ buf = container_of(vb, struct mx1_buffer, vb);
+ WARN_ON(buf->inwork || list_empty(&vb->queue));
+ dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
+ vb, vb->baddr, vb->bsize);
+
+ mx1_camera_wakeup(pcdev, vb, buf);
+out:
+ spin_unlock_irqrestore(&pcdev->lock, flags);
+}
+
+static struct videobuf_queue_ops mx1_videobuf_ops = {
+ .buf_setup = mx1_videobuf_setup,
+ .buf_prepare = mx1_videobuf_prepare,
+ .buf_queue = mx1_videobuf_queue,
+ .buf_release = mx1_videobuf_release,
+};
+
+static void mx1_camera_init_videobuf(struct videobuf_queue *q,
+ struct soc_camera_device *icd)
+{
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+ struct mx1_camera_dev *pcdev = ici->priv;
+
+ videobuf_queue_dma_contig_init(q, &mx1_videobuf_ops, icd->parent,
+ &pcdev->lock, V4L2_BUF_TYPE_VIDEO_CAPTURE,
+ V4L2_FIELD_NONE,
+ sizeof(struct mx1_buffer), icd, &icd->video_lock);
+}
+
+static int mclk_get_divisor(struct mx1_camera_dev *pcdev)
+{
+ unsigned int mclk = pcdev->mclk;
+ unsigned long div;
+ unsigned long lcdclk;
+
+ lcdclk = clk_get_rate(pcdev->clk);
+
+ /*
+ * We verify platform_mclk_10khz != 0, so if anyone breaks it, here
+ * they get a nice Oops
+ */
+ div = (lcdclk + 2 * mclk - 1) / (2 * mclk) - 1;
+
+ dev_dbg(pcdev->icd->parent,
+ "System clock %lukHz, target freq %dkHz, divisor %lu\n",
+ lcdclk / 1000, mclk / 1000, div);
+
+ return div;
+}
+
+static void mx1_camera_activate(struct mx1_camera_dev *pcdev)
+{
+ unsigned int csicr1 = CSICR1_EN;
+
+ dev_dbg(pcdev->icd->parent, "Activate device\n");
+
+ clk_enable(pcdev->clk);
+
+ /* enable CSI before doing anything else */
+ __raw_writel(csicr1, pcdev->base + CSICR1);
+
+ csicr1 |= CSICR1_MCLKEN | CSICR1_FCC | CSICR1_GCLK_MODE;
+ csicr1 |= CSICR1_MCLKDIV(mclk_get_divisor(pcdev));
+ csicr1 |= CSICR1_RXFF_LEVEL(2); /* 16 words */
+
+ __raw_writel(csicr1, pcdev->base + CSICR1);
+}
+
+static void mx1_camera_deactivate(struct mx1_camera_dev *pcdev)
+{
+ dev_dbg(pcdev->icd->parent, "Deactivate device\n");
+
+ /* Disable all CSI interface */
+ __raw_writel(0x00, pcdev->base + CSICR1);
+
+ clk_disable(pcdev->clk);
+}
+
+/*
+ * The following two functions absolutely depend on the fact, that
+ * there can be only one camera on i.MX1/i.MXL camera sensor interface
+ */
+static int mx1_camera_add_device(struct soc_camera_device *icd)
+{
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+ struct mx1_camera_dev *pcdev = ici->priv;
+
+ if (pcdev->icd)
+ return -EBUSY;
+
+ dev_info(icd->parent, "MX1 Camera driver attached to camera %d\n",
+ icd->devnum);
+
+ mx1_camera_activate(pcdev);
+
+ pcdev->icd = icd;
+
+ return 0;
+}
+
+static void mx1_camera_remove_device(struct soc_camera_device *icd)
+{
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+ struct mx1_camera_dev *pcdev = ici->priv;
+ unsigned int csicr1;
+
+ BUG_ON(icd != pcdev->icd);
+
+ /* disable interrupts */
+ csicr1 = __raw_readl(pcdev->base + CSICR1) & ~CSI_IRQ_MASK;
+ __raw_writel(csicr1, pcdev->base + CSICR1);
+
+ /* Stop DMA engine */
+ imx_dma_disable(pcdev->dma_chan);
+
+ dev_info(icd->parent, "MX1 Camera driver detached from camera %d\n",
+ icd->devnum);
+
+ mx1_camera_deactivate(pcdev);
+
+ pcdev->icd = NULL;
+}
+
+static int mx1_camera_set_crop(struct soc_camera_device *icd,
+ struct v4l2_crop *a)
+{
+ struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+
+ return v4l2_subdev_call(sd, video, s_crop, a);
+}
+
+static int mx1_camera_set_bus_param(struct soc_camera_device *icd)
+{
+ struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+ struct mx1_camera_dev *pcdev = ici->priv;
+ struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
+ unsigned long common_flags;
+ unsigned int csicr1;
+ int ret;
+
+ /* MX1 supports only 8bit buswidth */
+ ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
+ if (!ret) {
+ common_flags = soc_mbus_config_compatible(&cfg, CSI_BUS_FLAGS);
+ if (!common_flags) {
+ dev_warn(icd->parent,
+ "Flags incompatible: camera 0x%x, host 0x%x\n",
+ cfg.flags, CSI_BUS_FLAGS);
+ return -EINVAL;
+ }
+ } else if (ret != -ENOIOCTLCMD) {
+ return ret;
+ } else {
+ common_flags = CSI_BUS_FLAGS;
+ }
+
+ /* Make choises, based on platform choice */
+ if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
+ (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
+ if (!pcdev->pdata ||
+ pcdev->pdata->flags & MX1_CAMERA_VSYNC_HIGH)
+ common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
+ else
+ common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
+ }
+
+ if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
+ (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
+ if (!pcdev->pdata ||
+ pcdev->pdata->flags & MX1_CAMERA_PCLK_RISING)
+ common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
+ else
+ common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
+ }
+
+ if ((common_flags & V4L2_MBUS_DATA_ACTIVE_HIGH) &&
+ (common_flags & V4L2_MBUS_DATA_ACTIVE_LOW)) {
+ if (!pcdev->pdata ||
+ pcdev->pdata->flags & MX1_CAMERA_DATA_HIGH)
+ common_flags &= ~V4L2_MBUS_DATA_ACTIVE_LOW;
+ else
+ common_flags &= ~V4L2_MBUS_DATA_ACTIVE_HIGH;
+ }
+
+ cfg.flags = common_flags;
+ ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
+ if (ret < 0 && ret != -ENOIOCTLCMD) {
+ dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
+ common_flags, ret);
+ return ret;
+ }
+
+ csicr1 = __raw_readl(pcdev->base + CSICR1);
+
+ if (common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
+ csicr1 |= CSICR1_REDGE;
+ if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
+ csicr1 |= CSICR1_SOF_POL;
+ if (common_flags & V4L2_MBUS_DATA_ACTIVE_LOW)
+ csicr1 |= CSICR1_DATA_POL;
+
+ __raw_writel(csicr1, pcdev->base + CSICR1);
+
+ return 0;
+}
+
+static int mx1_camera_set_fmt(struct soc_camera_device *icd,
+ struct v4l2_format *f)
+{
+ struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+ const struct soc_camera_format_xlate *xlate;
+ struct v4l2_pix_format *pix = &f->fmt.pix;
+ struct v4l2_mbus_framefmt mf;
+ int ret, buswidth;
+
+ xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
+ if (!xlate) {
+ dev_warn(icd->parent, "Format %x not found\n",
+ pix->pixelformat);
+ return -EINVAL;
+ }
+
+ buswidth = xlate->host_fmt->bits_per_sample;
+ if (buswidth > 8) {
+ dev_warn(icd->parent,
+ "bits-per-sample %d for format %x unsupported\n",
+ buswidth, pix->pixelformat);
+ return -EINVAL;
+ }
+
+ mf.width = pix->width;
+ mf.height = pix->height;
+ mf.field = pix->field;
+ mf.colorspace = pix->colorspace;
+ mf.code = xlate->code;
+
+ ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
+ if (ret < 0)
+ return ret;
+
+ if (mf.code != xlate->code)
+ return -EINVAL;
+
+ pix->width = mf.width;
+ pix->height = mf.height;
+ pix->field = mf.field;
+ pix->colorspace = mf.colorspace;
+ icd->current_fmt = xlate;
+
+ return ret;
+}
+
+static int mx1_camera_try_fmt(struct soc_camera_device *icd,
+ struct v4l2_format *f)
+{
+ struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+ const struct soc_camera_format_xlate *xlate;
+ struct v4l2_pix_format *pix = &f->fmt.pix;
+ struct v4l2_mbus_framefmt mf;
+ int ret;
+ /* TODO: limit to mx1 hardware capabilities */
+
+ xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
+ if (!xlate) {
+ dev_warn(icd->parent, "Format %x not found\n",
+ pix->pixelformat);
+ return -EINVAL;
+ }
+
+ mf.width = pix->width;
+ mf.height = pix->height;
+ mf.field = pix->field;
+ mf.colorspace = pix->colorspace;
+ mf.code = xlate->code;
+
+ /* limit to sensor capabilities */
+ ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
+ if (ret < 0)
+ return ret;
+
+ pix->width = mf.width;
+ pix->height = mf.height;
+ pix->field = mf.field;
+ pix->colorspace = mf.colorspace;
+
+ return 0;
+}
+
+static int mx1_camera_reqbufs(struct soc_camera_device *icd,
+ 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 mx1_buffer *buf = container_of(icd->vb_vidq.bufs[i],
+ struct mx1_buffer, vb);
+ buf->inwork = 0;
+ INIT_LIST_HEAD(&buf->vb.queue);
+ }
+
+ return 0;
+}
+
+static unsigned int mx1_camera_poll(struct file *file, poll_table *pt)
+{
+ struct soc_camera_device *icd = file->private_data;
+ struct mx1_buffer *buf;
+
+ buf = list_entry(icd->vb_vidq.stream.next, struct mx1_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 mx1_camera_querycap(struct soc_camera_host *ici,
+ struct v4l2_capability *cap)
+{
+ /* cap->name is set by the friendly caller:-> */
+ strlcpy(cap->card, "i.MX1/i.MXL Camera", sizeof(cap->card));
+ cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
+
+ return 0;
+}
+
+static struct soc_camera_host_ops mx1_soc_camera_host_ops = {
+ .owner = THIS_MODULE,
+ .add = mx1_camera_add_device,
+ .remove = mx1_camera_remove_device,
+ .set_bus_param = mx1_camera_set_bus_param,
+ .set_crop = mx1_camera_set_crop,
+ .set_fmt = mx1_camera_set_fmt,
+ .try_fmt = mx1_camera_try_fmt,
+ .init_videobuf = mx1_camera_init_videobuf,
+ .reqbufs = mx1_camera_reqbufs,
+ .poll = mx1_camera_poll,
+ .querycap = mx1_camera_querycap,
+};
+
+static struct fiq_handler fh = {
+ .name = "csi_sof"
+};
+
+static int __init mx1_camera_probe(struct platform_device *pdev)
+{
+ struct mx1_camera_dev *pcdev;
+ struct resource *res;
+ struct pt_regs regs;
+ struct clk *clk;
+ 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 || (int)irq <= 0) {
+ err = -ENODEV;
+ goto exit;
+ }
+
+ clk = clk_get(&pdev->dev, "csi_clk");
+ if (IS_ERR(clk)) {
+ err = PTR_ERR(clk);
+ goto exit;
+ }
+
+ pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
+ if (!pcdev) {
+ dev_err(&pdev->dev, "Could not allocate pcdev\n");
+ err = -ENOMEM;
+ goto exit_put_clk;
+ }
+
+ pcdev->res = res;
+ pcdev->clk = clk;
+
+ pcdev->pdata = pdev->dev.platform_data;
+
+ if (pcdev->pdata)
+ pcdev->mclk = pcdev->pdata->mclk_10khz * 10000;
+
+ if (!pcdev->mclk) {
+ dev_warn(&pdev->dev,
+ "mclk_10khz == 0! Please, fix your platform data. "
+ "Using default 20MHz\n");
+ pcdev->mclk = 20000000;
+ }
+
+ INIT_LIST_HEAD(&pcdev->capture);
+ spin_lock_init(&pcdev->lock);
+
+ /*
+ * Request the regions.
+ */
+ if (!request_mem_region(res->start, resource_size(res), DRIVER_NAME)) {
+ err = -EBUSY;
+ goto exit_kfree;
+ }
+
+ base = ioremap(res->start, resource_size(res));
+ if (!base) {
+ err = -ENOMEM;
+ goto exit_release;
+ }
+ pcdev->irq = irq;
+ pcdev->base = base;
+
+ /* request dma */
+ pcdev->dma_chan = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_HIGH);
+ if (pcdev->dma_chan < 0) {
+ dev_err(&pdev->dev, "Can't request DMA for MX1 CSI\n");
+ err = -EBUSY;
+ goto exit_iounmap;
+ }
+ dev_dbg(&pdev->dev, "got DMA channel %d\n", pcdev->dma_chan);
+
+ imx_dma_setup_handlers(pcdev->dma_chan, mx1_camera_dma_irq, NULL,
+ pcdev);
+
+ imx_dma_config_channel(pcdev->dma_chan, IMX_DMA_TYPE_FIFO,
+ IMX_DMA_MEMSIZE_32, MX1_DMA_REQ_CSI_R, 0);
+ /* burst length : 16 words = 64 bytes */
+ imx_dma_config_burstlen(pcdev->dma_chan, 0);
+
+ /* request irq */
+ err = claim_fiq(&fh);
+ if (err) {
+ dev_err(&pdev->dev, "Camera interrupt register failed \n");
+ goto exit_free_dma;
+ }
+
+ set_fiq_handler(&mx1_camera_sof_fiq_start, &mx1_camera_sof_fiq_end -
+ &mx1_camera_sof_fiq_start);
+
+ regs.ARM_r8 = (long)MX1_DMA_DIMR;
+ regs.ARM_r9 = (long)MX1_DMA_CCR(pcdev->dma_chan);
+ regs.ARM_r10 = (long)pcdev->base + CSICR1;
+ regs.ARM_fp = (long)pcdev->base + CSISR;
+ regs.ARM_sp = 1 << pcdev->dma_chan;
+ set_fiq_regs(&regs);
+
+ mxc_set_irq_fiq(irq, 1);
+ enable_fiq(irq);
+
+ pcdev->soc_host.drv_name = DRIVER_NAME;
+ pcdev->soc_host.ops = &mx1_soc_camera_host_ops;
+ pcdev->soc_host.priv = pcdev;
+ pcdev->soc_host.v4l2_dev.dev = &pdev->dev;
+ pcdev->soc_host.nr = pdev->id;
+ err = soc_camera_host_register(&pcdev->soc_host);
+ if (err)
+ goto exit_free_irq;
+
+ dev_info(&pdev->dev, "MX1 Camera driver loaded\n");
+
+ return 0;
+
+exit_free_irq:
+ disable_fiq(irq);
+ mxc_set_irq_fiq(irq, 0);
+ release_fiq(&fh);
+exit_free_dma:
+ imx_dma_free(pcdev->dma_chan);
+exit_iounmap:
+ iounmap(base);
+exit_release:
+ release_mem_region(res->start, resource_size(res));
+exit_kfree:
+ kfree(pcdev);
+exit_put_clk:
+ clk_put(clk);
+exit:
+ return err;
+}
+
+static int __exit mx1_camera_remove(struct platform_device *pdev)
+{
+ struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
+ struct mx1_camera_dev *pcdev = container_of(soc_host,
+ struct mx1_camera_dev, soc_host);
+ struct resource *res;
+
+ imx_dma_free(pcdev->dma_chan);
+ disable_fiq(pcdev->irq);
+ mxc_set_irq_fiq(pcdev->irq, 0);
+ release_fiq(&fh);
+
+ clk_put(pcdev->clk);
+
+ soc_camera_host_unregister(soc_host);
+
+ iounmap(pcdev->base);
+
+ res = pcdev->res;
+ release_mem_region(res->start, resource_size(res));
+
+ kfree(pcdev);
+
+ dev_info(&pdev->dev, "MX1 Camera driver unloaded\n");
+
+ return 0;
+}
+
+static struct platform_driver mx1_camera_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+ .remove = __exit_p(mx1_camera_remove),
+};
+
+static int __init mx1_camera_init(void)
+{
+ return platform_driver_probe(&mx1_camera_driver, mx1_camera_probe);
+}
+
+static void __exit mx1_camera_exit(void)
+{
+ return platform_driver_unregister(&mx1_camera_driver);
+}
+
+module_init(mx1_camera_init);
+module_exit(mx1_camera_exit);
+
+MODULE_DESCRIPTION("i.MX1/i.MXL SoC Camera Host driver");
+MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@teltonika.lt>");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_ALIAS("platform:" DRIVER_NAME);

Privacy Policy