V4L/DVB (7578a): V4L: V4L2 soc_camera driver for PXA270
This patch adds a driver for the Quick Capture Interface on the PXA270.
It is based on the original driver from Intel, but has been re-worked
multiple times since then, now it also supports the V4L2 API. This patch
depends on a complementary patch, submitted to the ARM tree, providing
PXA270 camera platform bindings.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/pxa_camera.c b/drivers/media/video/pxa_camera.c
new file mode 100644
index 0000000..11aecad
--- /dev/null
+++ b/drivers/media/video/pxa_camera.c
@@ -0,0 +1,937 @@
+/*
+ * V4L2 Driver for PXA camera host
+ *
+ * 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 <asm/io.h>
+
+#include <linux/init.h>
+#include <linux/module.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/clk.h>
+
+#include <media/v4l2-common.h>
+#include <media/v4l2-dev.h>
+#include <media/soc_camera.h>
+
+#include <linux/videodev2.h>
+
+#include <asm/dma.h>
+#include <asm/arch/pxa-regs.h>
+#include <asm/arch/camera.h>
+
+#define PXA_CAM_VERSION_CODE KERNEL_VERSION(0, 0, 5)
+#define PXA_CAM_DRV_NAME "pxa27x-camera"
+
+#define CICR0_IRQ_MASK (CICR0_TOM | CICR0_RDAVM | CICR0_FEM | CICR0_EOLM | \
+ CICR0_PERRM | CICR0_QDM | CICR0_CDM | CICR0_SOFM | \
+ CICR0_EOFM | CICR0_FOM)
+
+static DEFINE_MUTEX(camera_lock);
+
+/*
+ * Structures
+ */
+
+/* buffer for one video frame */
+struct pxa_buffer {
+ /* common v4l buffer stuff -- must be first */
+ struct videobuf_buffer vb;
+
+ const struct soc_camera_data_format *fmt;
+
+ /* our descriptor list needed for the PXA DMA engine */
+ dma_addr_t sg_dma;
+ struct pxa_dma_desc *sg_cpu;
+ size_t sg_size;
+ int inwork;
+};
+
+struct pxa_framebuffer_queue {
+ dma_addr_t sg_last_dma;
+ struct pxa_dma_desc *sg_last_cpu;
+};
+
+struct pxa_camera_dev {
+ struct device *dev;
+ /* PXA27x is only supposed to handle one camera on its Quick Capture
+ * interface. If anyone ever builds hardware to enable more than
+ * one camera, they will have to modify this driver too */
+ struct soc_camera_device *icd;
+ struct clk *clk;
+
+ unsigned int irq;
+ void __iomem *base;
+ unsigned int dma_chan_y;
+
+ enum v4l2_buf_type type;
+
+ struct pxacamera_platform_data *pdata;
+ struct resource *res;
+ unsigned long platform_flags;
+ unsigned long platform_mclk_10khz;
+
+ struct list_head capture;
+
+ spinlock_t lock;
+
+ int dma_running;
+
+ struct pxa_buffer *active;
+};
+
+static const char *pxa_cam_driver_description = "PXA_Camera";
+
+static unsigned int vid_limit = 16; /* Video memory limit, in Mb */
+
+/*
+ * Videobuf operations
+ */
+static int
+pxa_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
+ unsigned int *size)
+{
+ struct soc_camera_device *icd = vq->priv_data;
+
+ dev_dbg(&icd->dev, "count=%d, size=%d\n", *count, *size);
+
+ *size = icd->width * icd->height * ((icd->current_fmt->depth + 7) >> 3);
+
+ if (0 == *count)
+ *count = 32;
+ while (*size * *count > vid_limit * 1024 * 1024)
+ (*count)--;
+
+ return 0;
+}
+
+static void free_buffer(struct videobuf_queue *vq, struct pxa_buffer *buf)
+{
+ struct soc_camera_device *icd = vq->priv_data;
+ struct soc_camera_host *ici =
+ to_soc_camera_host(icd->dev.parent);
+ struct pxa_camera_dev *pcdev = ici->priv;
+ struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
+
+ BUG_ON(in_interrupt());
+
+ dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __FUNCTION__,
+ &buf->vb, buf->vb.baddr, buf->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(&buf->vb, 0, 0);
+ videobuf_dma_unmap(vq, dma);
+ videobuf_dma_free(dma);
+
+ if (buf->sg_cpu)
+ dma_free_coherent(pcdev->dev, buf->sg_size, buf->sg_cpu,
+ buf->sg_dma);
+ buf->sg_cpu = NULL;
+
+ buf->vb.state = VIDEOBUF_NEEDS_INIT;
+}
+
+static int
+pxa_videobuf_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
+ enum v4l2_field field)
+{
+ struct soc_camera_device *icd = vq->priv_data;
+ struct soc_camera_host *ici =
+ to_soc_camera_host(icd->dev.parent);
+ struct pxa_camera_dev *pcdev = ici->priv;
+ struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb);
+ int i, ret;
+
+ dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __FUNCTION__,
+ 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);
+
+ /* I think, in buf_prepare you only have to protect global data,
+ * the actual buffer is yours */
+ buf->inwork = 1;
+
+ 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) {
+ unsigned int size = vb->size;
+ struct videobuf_dmabuf *dma = videobuf_to_dma(vb);
+
+ ret = videobuf_iolock(vq, vb, NULL);
+ if (ret)
+ goto fail;
+
+ if (buf->sg_cpu)
+ dma_free_coherent(pcdev->dev, buf->sg_size, buf->sg_cpu,
+ buf->sg_dma);
+
+ buf->sg_size = (dma->sglen + 1) * sizeof(struct pxa_dma_desc);
+ buf->sg_cpu = dma_alloc_coherent(pcdev->dev, buf->sg_size,
+ &buf->sg_dma, GFP_KERNEL);
+ if (!buf->sg_cpu) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ dev_dbg(&icd->dev, "nents=%d size: %d sg=0x%p\n",
+ dma->sglen, size, dma->sglist);
+ for (i = 0; i < dma->sglen; i++) {
+ struct scatterlist *sg = dma->sglist;
+ unsigned int dma_len = sg_dma_len(&sg[i]), xfer_len;
+
+ /* CIBR0 */
+ buf->sg_cpu[i].dsadr = pcdev->res->start + 0x28;
+ buf->sg_cpu[i].dtadr = sg_dma_address(&sg[i]);
+ /* PXA270 Developer's Manual 27.4.4.1:
+ * round up to 8 bytes */
+ xfer_len = (min(dma_len, size) + 7) & ~7;
+ if (xfer_len & 7)
+ dev_err(&icd->dev, "Unaligned buffer: "
+ "dma_len %u, size %u\n", dma_len, size);
+ buf->sg_cpu[i].dcmd = DCMD_FLOWSRC | DCMD_BURST8 |
+ DCMD_INCTRGADDR | xfer_len;
+ size -= dma_len;
+ buf->sg_cpu[i].ddadr = buf->sg_dma + (i + 1) *
+ sizeof(struct pxa_dma_desc);
+ }
+ buf->sg_cpu[dma->sglen - 1].ddadr = DDADR_STOP;
+ buf->sg_cpu[dma->sglen - 1].dcmd |= DCMD_ENDIRQEN;
+
+ vb->state = VIDEOBUF_PREPARED;
+ }
+
+ buf->inwork = 0;
+
+ return 0;
+
+fail:
+ free_buffer(vq, buf);
+out:
+ buf->inwork = 0;
+ return ret;
+}
+
+static void
+pxa_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 pxa_camera_dev *pcdev = ici->priv;
+ struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb);
+ struct pxa_buffer *active = pcdev->active;
+ struct videobuf_dmabuf *dma = videobuf_to_dma(vb);
+ int nents = dma->sglen;
+ unsigned long flags;
+
+ dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __FUNCTION__,
+ vb, vb->baddr, vb->bsize);
+ spin_lock_irqsave(&pcdev->lock, flags);
+
+ list_add_tail(&vb->queue, &pcdev->capture);
+
+ vb->state = VIDEOBUF_ACTIVE;
+
+ if (!pcdev->active) {
+ CIFR |= CIFR_RESET_F;
+ DDADR(pcdev->dma_chan_y) = buf->sg_dma;
+ DCSR(pcdev->dma_chan_y) = DCSR_RUN;
+ pcdev->active = buf;
+ CICR0 |= CICR0_ENB;
+ } else {
+ struct videobuf_dmabuf *active_dma =
+ videobuf_to_dma(&active->vb);
+ /* Stop DMA engine */
+ DCSR(pcdev->dma_chan_y) = 0;
+
+ /* Add the descriptors we just initialized to the currently
+ * running chain
+ */
+ active->sg_cpu[active_dma->sglen - 1].ddadr = buf->sg_dma;
+
+ /* Setup a dummy descriptor with the DMA engines current
+ * state
+ */
+ /* CIBR0 */
+ buf->sg_cpu[nents].dsadr = pcdev->res->start + 0x28;
+ buf->sg_cpu[nents].dtadr = DTADR(pcdev->dma_chan_y);
+ buf->sg_cpu[nents].dcmd = DCMD(pcdev->dma_chan_y);
+
+ if (DDADR(pcdev->dma_chan_y) == DDADR_STOP) {
+ /* The DMA engine is on the last descriptor, set the
+ * next descriptors address to the descriptors
+ * we just initialized
+ */
+ buf->sg_cpu[nents].ddadr = buf->sg_dma;
+ } else {
+ buf->sg_cpu[nents].ddadr = DDADR(pcdev->dma_chan_y);
+ }
+
+ /* The next descriptor is the dummy descriptor */
+ DDADR(pcdev->dma_chan_y) = buf->sg_dma + nents *
+ sizeof(struct pxa_dma_desc);
+
+#ifdef DEBUG
+ if (CISR & CISR_IFO_0) {
+ dev_warn(pcdev->dev, "FIFO overrun\n");
+ DDADR(pcdev->dma_chan_y) = pcdev->active->sg_dma;
+
+ CICR0 &= ~CICR0_ENB;
+ CIFR |= CIFR_RESET_F;
+ DCSR(pcdev->dma_chan_y) = DCSR_RUN;
+ CICR0 |= CICR0_ENB;
+ } else
+#endif
+ DCSR(pcdev->dma_chan_y) = DCSR_RUN;
+ }
+
+ spin_unlock_irqrestore(&pcdev->lock, flags);
+
+}
+
+static void pxa_videobuf_release(struct videobuf_queue *vq,
+ struct videobuf_buffer *vb)
+{
+ struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb);
+#ifdef DEBUG
+ struct soc_camera_device *icd = vq->priv_data;
+
+ dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __FUNCTION__,
+ vb, vb->baddr, vb->bsize);
+
+ switch (vb->state) {
+ case VIDEOBUF_ACTIVE:
+ dev_dbg(&icd->dev, "%s (active)\n", __FUNCTION__);
+ break;
+ case VIDEOBUF_QUEUED:
+ dev_dbg(&icd->dev, "%s (queued)\n", __FUNCTION__);
+ break;
+ case VIDEOBUF_PREPARED:
+ dev_dbg(&icd->dev, "%s (prepared)\n", __FUNCTION__);
+ break;
+ default:
+ dev_dbg(&icd->dev, "%s (unknown)\n", __FUNCTION__);
+ break;
+ }
+#endif
+
+ free_buffer(vq, buf);
+}
+
+static void pxa_camera_dma_irq_y(int channel, void *data)
+{
+ struct pxa_camera_dev *pcdev = data;
+ struct pxa_buffer *buf;
+ unsigned long flags;
+ unsigned int status;
+ struct videobuf_buffer *vb;
+
+ spin_lock_irqsave(&pcdev->lock, flags);
+
+ status = DCSR(pcdev->dma_chan_y);
+ if (status & DCSR_BUSERR) {
+ dev_err(pcdev->dev, "%s: Bus Error\n", __FUNCTION__);
+ DCSR(pcdev->dma_chan_y) |= DCSR_BUSERR;
+ goto out;
+ }
+
+ if (!(status & DCSR_ENDINTR)) {
+ dev_err(pcdev->dev, "%s: unknown dma interrupt source. "
+ "status: 0x%08x\n", __FUNCTION__, status);
+ goto out;
+ }
+
+ DCSR(pcdev->dma_chan_y) |= DCSR_ENDINTR;
+
+ if (!pcdev->active) {
+ dev_err(pcdev->dev, "%s: no active buf\n", __FUNCTION__);
+ goto out;
+ }
+
+ vb = &pcdev->active->vb;
+ buf = container_of(vb, struct pxa_buffer, vb);
+ WARN_ON(buf->inwork || list_empty(&vb->queue));
+ dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __FUNCTION__,
+ vb, vb->baddr, vb->bsize);
+
+ /* _init is used to debug races, see comment in pxa_is_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;
+ DCSR(pcdev->dma_chan_y) = 0;
+ CICR0 &= ~CICR0_ENB;
+ goto out;
+ }
+
+ pcdev->active = list_entry(pcdev->capture.next, struct pxa_buffer,
+ vb.queue);
+
+out:
+ spin_unlock_irqrestore(&pcdev->lock, flags);
+}
+
+static struct videobuf_queue_ops pxa_video_ops = {
+ .buf_setup = pxa_videobuf_setup,
+ .buf_prepare = pxa_videobuf_prepare,
+ .buf_queue = pxa_videobuf_queue,
+ .buf_release = pxa_videobuf_release,
+};
+
+static int mclk_get_divisor(struct pxa_camera_dev *pcdev)
+{
+ unsigned int mclk_10khz = pcdev->platform_mclk_10khz;
+ unsigned long div;
+ unsigned long lcdclk;
+
+ lcdclk = clk_get_rate(pcdev->clk) / 10000;
+
+ /* We verify platform_mclk_10khz != 0, so if anyone breaks it, here
+ * they get a nice Oops */
+ div = (lcdclk + 2 * mclk_10khz - 1) / (2 * mclk_10khz) - 1;
+
+ dev_dbg(pcdev->dev, "LCD clock %lukHz, target freq %dkHz, "
+ "divisor %lu\n", lcdclk * 10, mclk_10khz * 10, div);
+
+ return div;
+}
+
+static void pxa_is_activate(struct pxa_camera_dev *pcdev)
+{
+ struct pxacamera_platform_data *pdata = pcdev->pdata;
+ u32 cicr4 = 0;
+
+ dev_dbg(pcdev->dev, "Registered platform device at %p data %p\n",
+ pcdev, pdata);
+
+ if (pdata && pdata->init) {
+ dev_dbg(pcdev->dev, "%s: Init gpios\n", __FUNCTION__);
+ pdata->init(pcdev->dev);
+ }
+
+ if (pdata && pdata->power) {
+ dev_dbg(pcdev->dev, "%s: Power on camera\n", __FUNCTION__);
+ pdata->power(pcdev->dev, 1);
+ }
+
+ if (pdata && pdata->reset) {
+ dev_dbg(pcdev->dev, "%s: Releasing camera reset\n",
+ __FUNCTION__);
+ pdata->reset(pcdev->dev, 1);
+ }
+
+ CICR0 = 0x3FF; /* disable all interrupts */
+
+ if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN)
+ cicr4 |= CICR4_PCLK_EN;
+ if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
+ cicr4 |= CICR4_MCLK_EN;
+ if (pcdev->platform_flags & PXA_CAMERA_PCP)
+ cicr4 |= CICR4_PCP;
+ if (pcdev->platform_flags & PXA_CAMERA_HSP)
+ cicr4 |= CICR4_HSP;
+ if (pcdev->platform_flags & PXA_CAMERA_VSP)
+ cicr4 |= CICR4_VSP;
+
+ CICR4 = mclk_get_divisor(pcdev) | cicr4;
+
+ clk_enable(pcdev->clk);
+}
+
+static void pxa_is_deactivate(struct pxa_camera_dev *pcdev)
+{
+ struct pxacamera_platform_data *board = pcdev->pdata;
+
+ clk_disable(pcdev->clk);
+
+ if (board && board->reset) {
+ dev_dbg(pcdev->dev, "%s: Asserting camera reset\n",
+ __FUNCTION__);
+ board->reset(pcdev->dev, 0);
+ }
+
+ if (board && board->power) {
+ dev_dbg(pcdev->dev, "%s: Power off camera\n", __FUNCTION__);
+ board->power(pcdev->dev, 0);
+ }
+}
+
+static irqreturn_t pxa_camera_irq(int irq, void *data)
+{
+ struct pxa_camera_dev *pcdev = data;
+ unsigned int status = CISR;
+
+ dev_dbg(pcdev->dev, "Camera interrupt status 0x%x\n", status);
+
+ CISR = status;
+
+ return IRQ_HANDLED;
+}
+
+/* The following two functions absolutely depend on the fact, that
+ * there can be only one camera on PXA quick capture interface */
+static int pxa_is_add_device(struct soc_camera_device *icd)
+{
+ struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
+ struct pxa_camera_dev *pcdev = ici->priv;
+ int ret;
+
+ mutex_lock(&camera_lock);
+
+ if (pcdev->icd) {
+ ret = -EBUSY;
+ goto ebusy;
+ }
+
+ dev_info(&icd->dev, "PXA Camera driver attached to camera %d\n",
+ icd->devnum);
+
+ pxa_is_activate(pcdev);
+ ret = icd->ops->init(icd);
+
+ if (!ret)
+ pcdev->icd = icd;
+
+ebusy:
+ mutex_unlock(&camera_lock);
+
+ return ret;
+}
+
+static void pxa_is_remove_device(struct soc_camera_device *icd)
+{
+ struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
+ struct pxa_camera_dev *pcdev = ici->priv;
+
+ BUG_ON(icd != pcdev->icd);
+
+ dev_info(&icd->dev, "PXA Camera driver detached from camera %d\n",
+ icd->devnum);
+
+ /* disable capture, disable interrupts */
+ CICR0 = 0x3ff;
+ /* Stop DMA engine */
+ DCSR(pcdev->dma_chan_y) = 0;
+
+ icd->ops->release(icd);
+
+ pxa_is_deactivate(pcdev);
+
+ pcdev->icd = NULL;
+}
+
+static int pxa_is_set_capture_format(struct soc_camera_device *icd,
+ __u32 pixfmt, struct v4l2_rect *rect)
+{
+ struct soc_camera_host *ici =
+ to_soc_camera_host(icd->dev.parent);
+ struct pxa_camera_dev *pcdev = ici->priv;
+ unsigned int datawidth = 0, dw, bpp;
+ u32 cicr0, cicr4 = 0;
+ int ret;
+
+ /* If requested data width is supported by the platform, use it */
+ switch (icd->cached_datawidth) {
+ case 10:
+ if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_10)
+ datawidth = IS_DATAWIDTH_10;
+ break;
+ case 9:
+ if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_9)
+ datawidth = IS_DATAWIDTH_9;
+ break;
+ case 8:
+ if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_8)
+ datawidth = IS_DATAWIDTH_8;
+ }
+ if (!datawidth)
+ return -EINVAL;
+
+ ret = icd->ops->set_capture_format(icd, pixfmt, rect,
+ datawidth |
+ (pcdev->platform_flags & PXA_CAMERA_MASTER ?
+ IS_MASTER : 0) |
+ (pcdev->platform_flags & PXA_CAMERA_HSP ?
+ 0 : IS_HSYNC_ACTIVE_HIGH) |
+ (pcdev->platform_flags & PXA_CAMERA_VSP ?
+ 0 : IS_VSYNC_ACTIVE_HIGH) |
+ (pcdev->platform_flags & PXA_CAMERA_PCP ?
+ 0 : IS_PCLK_SAMPLE_RISING));
+ if (ret < 0)
+ return ret;
+
+ /* Datawidth is now guaranteed to be equal to one of the three values.
+ * We fix bit-per-pixel equal to data-width... */
+ switch (datawidth) {
+ case IS_DATAWIDTH_10:
+ icd->cached_datawidth = 10;
+ dw = 4;
+ bpp = 0x40;
+ break;
+ case IS_DATAWIDTH_9:
+ icd->cached_datawidth = 9;
+ dw = 3;
+ bpp = 0x20;
+ break;
+ default:
+ /* Actually it can only be 8 now,
+ * default is just to silence compiler warnings */
+ case IS_DATAWIDTH_8:
+ icd->cached_datawidth = 8;
+ dw = 2;
+ bpp = 0;
+ }
+
+ if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN)
+ cicr4 |= CICR4_PCLK_EN;
+ if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
+ cicr4 |= CICR4_MCLK_EN;
+ if (pcdev->platform_flags & PXA_CAMERA_PCP)
+ cicr4 |= CICR4_PCP;
+ if (pcdev->platform_flags & PXA_CAMERA_HSP)
+ cicr4 |= CICR4_HSP;
+ if (pcdev->platform_flags & PXA_CAMERA_VSP)
+ cicr4 |= CICR4_VSP;
+
+ cicr0 = CICR0;
+ if (cicr0 & CICR0_ENB)
+ CICR0 = cicr0 & ~CICR0_ENB;
+ CICR1 = CICR1_PPL_VAL(rect->width - 1) | bpp | dw;
+ CICR2 = 0;
+ CICR3 = CICR3_LPF_VAL(rect->height - 1) |
+ CICR3_BFW_VAL(min((unsigned short)255, icd->y_skip_top));
+ CICR4 = mclk_get_divisor(pcdev) | cicr4;
+
+ /* CIF interrupts are not used, only DMA */
+ CICR0 = (pcdev->platform_flags & PXA_CAMERA_MASTER ?
+ 0 : (CICR0_SL_CAP_EN | CICR0_SIM_SP)) |
+ CICR0_DMAEN | CICR0_IRQ_MASK | (cicr0 & CICR0_ENB);
+
+ return 0;
+}
+
+static int pxa_is_try_fmt_cap(struct soc_camera_host *ici,
+ struct v4l2_format *f)
+{
+ /* limit to pxa hardware capabilities */
+ if (f->fmt.pix.height < 32)
+ f->fmt.pix.height = 32;
+ if (f->fmt.pix.height > 2048)
+ f->fmt.pix.height = 2048;
+ if (f->fmt.pix.width < 48)
+ f->fmt.pix.width = 48;
+ if (f->fmt.pix.width > 2048)
+ f->fmt.pix.width = 2048;
+ f->fmt.pix.width &= ~0x01;
+
+ return 0;
+}
+
+static int pxa_is_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 pxa_buffer *buf = container_of(icf->vb_vidq.bufs[i],
+ struct pxa_buffer, vb);
+ buf->inwork = 0;
+ INIT_LIST_HEAD(&buf->vb.queue);
+ }
+
+ return 0;
+}
+
+static unsigned int pxa_is_poll(struct file *file, poll_table *pt)
+{
+ struct soc_camera_file *icf = file->private_data;
+ struct pxa_buffer *buf;
+
+ buf = list_entry(icf->vb_vidq.stream.next, struct pxa_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 pxa_is_querycap(struct soc_camera_host *ici,
+ struct v4l2_capability *cap)
+{
+ /* cap->name is set by the firendly caller:-> */
+ strlcpy(cap->card, pxa_cam_driver_description, sizeof(cap->card));
+ cap->version = PXA_CAM_VERSION_CODE;
+ cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
+
+ return 0;
+}
+
+/* Should beallocated dynamically too, but we have only one. */
+static struct soc_camera_host pxa_soc_camera_host = {
+ .drv_name = PXA_CAM_DRV_NAME,
+ .vbq_ops = &pxa_video_ops,
+ .add = pxa_is_add_device,
+ .remove = pxa_is_remove_device,
+ .msize = sizeof(struct pxa_buffer),
+ .set_capture_format = pxa_is_set_capture_format,
+ .try_fmt_cap = pxa_is_try_fmt_cap,
+ .reqbufs = pxa_is_reqbufs,
+ .poll = pxa_is_poll,
+ .querycap = pxa_is_querycap,
+};
+
+static int pxa_camera_probe(struct platform_device *pdev)
+{
+ struct pxa_camera_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) {
+ err = -ENODEV;
+ goto exit;
+ }
+
+ pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
+ if (!pcdev) {
+ dev_err(&pdev->dev, "%s: Could not allocate pcdev\n",
+ __FUNCTION__);
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ pcdev->clk = clk_get(&pdev->dev, "CAMCLK");
+ if (IS_ERR(pcdev->clk)) {
+ err = PTR_ERR(pcdev->clk);
+ goto exit_kfree;
+ }
+
+ dev_set_drvdata(&pdev->dev, pcdev);
+ pcdev->res = res;
+
+ pcdev->pdata = pdev->dev.platform_data;
+ pcdev->platform_flags = pcdev->pdata->flags;
+ if (!pcdev->platform_flags & (PXA_CAMERA_DATAWIDTH_8 |
+ PXA_CAMERA_DATAWIDTH_9 | PXA_CAMERA_DATAWIDTH_10)) {
+ /* Platform hasn't set available data widths. This is bad.
+ * Warn and use a default. */
+ dev_warn(&pdev->dev, "WARNING! Platform hasn't set available "
+ "data widths, using default 10 bit\n");
+ pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_10;
+ }
+ pcdev->platform_mclk_10khz = pcdev->pdata->mclk_10khz;
+ if (!pcdev->platform_mclk_10khz) {
+ dev_warn(&pdev->dev,
+ "mclk_10khz == 0! Please, fix your platform data. "
+ "Using default 20MHz\n");
+ pcdev->platform_mclk_10khz = 2000;
+ }
+
+ INIT_LIST_HEAD(&pcdev->capture);
+ spin_lock_init(&pcdev->lock);
+
+ /*
+ * Request the regions.
+ */
+ if (!request_mem_region(res->start, res->end - res->start + 1,
+ PXA_CAM_DRV_NAME)) {
+ err = -EBUSY;
+ goto exit_clk;
+ }
+
+ base = ioremap(res->start, res->end - res->start + 1);
+ if (!base) {
+ err = -ENOMEM;
+ goto exit_release;
+ }
+ pcdev->irq = irq;
+ pcdev->base = base;
+ pcdev->dev = &pdev->dev;
+
+ /* request dma */
+ pcdev->dma_chan_y = pxa_request_dma("CI_Y", DMA_PRIO_HIGH,
+ pxa_camera_dma_irq_y, pcdev);
+ if (pcdev->dma_chan_y < 0) {
+ dev_err(pcdev->dev, "Can't request DMA for Y\n");
+ err = -ENOMEM;
+ goto exit_iounmap;
+ }
+ dev_dbg(pcdev->dev, "got DMA channel %d\n", pcdev->dma_chan_y);
+
+ DRCMR68 = pcdev->dma_chan_y | DRCMR_MAPVLD;
+
+ /* request irq */
+ err = request_irq(pcdev->irq, pxa_camera_irq, 0, PXA_CAM_DRV_NAME,
+ pcdev);
+ if (err) {
+ dev_err(pcdev->dev, "Camera interrupt register failed \n");
+ goto exit_free_dma;
+ }
+
+ pxa_soc_camera_host.priv = pcdev;
+ pxa_soc_camera_host.dev.parent = &pdev->dev;
+ pxa_soc_camera_host.nr = pdev->id;
+ err = soc_camera_host_register(&pxa_soc_camera_host, THIS_MODULE);
+ if (err)
+ goto exit_free_irq;
+
+ return 0;
+
+exit_free_irq:
+ free_irq(pcdev->irq, pcdev);
+exit_free_dma:
+ pxa_free_dma(pcdev->dma_chan_y);
+exit_iounmap:
+ iounmap(base);
+exit_release:
+ release_mem_region(res->start, res->end - res->start + 1);
+exit_clk:
+ clk_put(pcdev->clk);
+exit_kfree:
+ kfree(pcdev);
+exit:
+ return err;
+}
+
+static int __devexit pxa_camera_remove(struct platform_device *pdev)
+{
+ struct pxa_camera_dev *pcdev = platform_get_drvdata(pdev);
+ struct resource *res;
+
+ clk_put(pcdev->clk);
+
+ pxa_free_dma(pcdev->dma_chan_y);
+ free_irq(pcdev->irq, pcdev);
+
+ soc_camera_host_unregister(&pxa_soc_camera_host);
+
+ iounmap(pcdev->base);
+
+ res = pcdev->res;
+ release_mem_region(res->start, res->end - res->start + 1);
+
+ kfree(pcdev);
+
+ dev_info(&pdev->dev, "%s: PXA Camera driver unloaded\n", __FUNCTION__);
+
+ return 0;
+}
+
+/*
+ * Suspend the Camera Module.
+ */
+static int pxa_camera_suspend(struct platform_device *pdev, pm_message_t level)
+{
+ struct pxa_camera_dev *pcdev = platform_get_drvdata(pdev);
+
+ dev_info(&pdev->dev, "camera suspend\n");
+ disable_irq(pcdev->irq);
+ return 0;
+}
+
+/*
+ * Resume the Camera Module.
+ */
+static int pxa_camera_resume(struct platform_device *pdev)
+{
+ struct pxa_camera_dev *pcdev = platform_get_drvdata(pdev);
+
+ dev_info(&pdev->dev, "camera resume\n");
+ enable_irq(pcdev->irq);
+
+/* if (pcdev) { */ /* FIXME: dev in use? */
+/* DRCMR68 = pcdev->dma_chan_y | DRCMR_MAPVLD; */
+/* DRCMR69 = pcdev->dma_chan_cb | DRCMR_MAPVLD; */
+/* DRCMR70 = pcdev->dma_chan_cr | DRCMR_MAPVLD; */
+/* } */
+
+ return 0;
+}
+
+
+static struct platform_driver pxa_camera_driver = {
+ .driver = {
+ .name = PXA_CAM_DRV_NAME,
+ },
+ .probe = pxa_camera_probe,
+ .remove = __exit_p(pxa_camera_remove),
+ .suspend = pxa_camera_suspend,
+ .resume = pxa_camera_resume,
+};
+
+
+static int __devinit pxa_camera_init(void)
+{
+ return platform_driver_register(&pxa_camera_driver);
+}
+
+static void __exit pxa_camera_exit(void)
+{
+ return platform_driver_unregister(&pxa_camera_driver);
+}
+
+module_init(pxa_camera_init);
+module_exit(pxa_camera_exit);
+
+MODULE_DESCRIPTION("PXA27x SoC Camera Host driver");
+MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
+MODULE_LICENSE("GPL");