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path: root/drivers/media/platform/atmel-isi.c
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-rw-r--r--drivers/media/platform/atmel-isi.c1099
1 files changed, 1099 insertions, 0 deletions
diff --git a/drivers/media/platform/atmel-isi.c b/drivers/media/platform/atmel-isi.c
new file mode 100644
index 000000000000..6274a91c25c7
--- /dev/null
+++ b/drivers/media/platform/atmel-isi.c
@@ -0,0 +1,1099 @@
+/*
+ * 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/platform_device.h>
+#include <linux/slab.h>
+
+#include <media/atmel-isi.h>
+#include <media/soc_camera.h>
+#include <media/soc_mediabus.h>
+#include <media/videobuf2-dma-contig.h>
+
+#define MAX_BUFFER_NUM 32
+#define MAX_SUPPORT_WIDTH 2048
+#define MAX_SUPPORT_HEIGHT 2048
+#define VID_LIMIT_BYTES (16 * 1024 * 1024)
+#define MIN_FRAME_RATE 15
+#define FRAME_INTERVAL_MILLI_SEC (1000 / MIN_FRAME_RATE)
+
+/* ISI states */
+enum {
+ ISI_STATE_IDLE = 0,
+ ISI_STATE_READY,
+ ISI_STATE_WAIT_SOF,
+};
+
+/* 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;
+ u32 fbd_phys;
+};
+
+/* Frame buffer data */
+struct frame_buffer {
+ struct vb2_buffer vb;
+ struct isi_dma_desc *p_dma_desc;
+ struct list_head list;
+};
+
+struct atmel_isi {
+ /* Protects the access of variables shared with the ISR */
+ spinlock_t lock;
+ void __iomem *regs;
+
+ int sequence;
+ /* State of the ISI module in capturing mode */
+ int state;
+
+ /* Wait queue for waiting for SOF */
+ wait_queue_head_t vsync_wq;
+
+ struct vb2_alloc_ctx *alloc_ctx;
+
+ /* Allocate descriptors for dma buffer use */
+ struct fbd *p_fb_descriptors;
+ u32 fb_descriptors_phys;
+ struct list_head dma_desc_head;
+ struct isi_dma_desc dma_desc[MAX_BUFFER_NUM];
+
+ struct completion complete;
+ /* ISI peripherial clock */
+ struct clk *pclk;
+ /* ISI_MCK, feed to camera sensor to generate pixel clock */
+ struct clk *mck;
+ 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 soc_camera_device *icd;
+ struct soc_camera_host soc_host;
+};
+
+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 int configure_geometry(struct atmel_isi *isi, u32 width,
+ u32 height, enum v4l2_mbus_pixelcode code)
+{
+ u32 cfg2, cr;
+
+ switch (code) {
+ /* YUV, including grey */
+ case V4L2_MBUS_FMT_Y8_1X8:
+ cr = ISI_CFG2_GRAYSCALE;
+ break;
+ case V4L2_MBUS_FMT_UYVY8_2X8:
+ cr = ISI_CFG2_YCC_SWAP_MODE_3;
+ break;
+ case V4L2_MBUS_FMT_VYUY8_2X8:
+ cr = ISI_CFG2_YCC_SWAP_MODE_2;
+ break;
+ case V4L2_MBUS_FMT_YUYV8_2X8:
+ cr = ISI_CFG2_YCC_SWAP_MODE_1;
+ break;
+ case V4L2_MBUS_FMT_YVYU8_2X8:
+ cr = ISI_CFG2_YCC_SWAP_DEFAULT;
+ break;
+ /* RGB, TODO */
+ default:
+ return -EINVAL;
+ }
+
+ isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
+
+ cfg2 = isi_readl(isi, ISI_CFG2);
+ cfg2 |= cr;
+ /* Set width */
+ cfg2 &= ~(ISI_CFG2_IM_HSIZE_MASK);
+ cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
+ ISI_CFG2_IM_HSIZE_MASK;
+ /* Set height */
+ cfg2 &= ~(ISI_CFG2_IM_VSIZE_MASK);
+ cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
+ & ISI_CFG2_IM_VSIZE_MASK;
+ isi_writel(isi, ISI_CFG2, cfg2);
+
+ return 0;
+}
+
+static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
+{
+ if (isi->active) {
+ struct vb2_buffer *vb = &isi->active->vb;
+ struct frame_buffer *buf = isi->active;
+
+ list_del_init(&buf->list);
+ do_gettimeofday(&vb->v4l2_buf.timestamp);
+ vb->v4l2_buf.sequence = isi->sequence++;
+ vb2_buffer_done(vb, 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);
+ isi_writel(isi, ISI_DMA_C_DSCR,
+ 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);
+ }
+ 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->lock);
+
+ 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 ((pending & ISI_SR_VSYNC) &&
+ (isi->state == ISI_STATE_IDLE)) {
+ isi->state = ISI_STATE_READY;
+ wake_up_interruptible(&isi->vsync_wq);
+ ret = IRQ_HANDLED;
+ }
+ if (likely(pending & ISI_SR_CXFR_DONE))
+ ret = atmel_isi_handle_streaming(isi);
+ }
+
+ spin_unlock(&isi->lock);
+ 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(100));
+ if (timeout == 0)
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+/* ------------------------------------------------------------------
+ Videobuf operations
+ ------------------------------------------------------------------*/
+static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
+ unsigned int *nbuffers, unsigned int *nplanes,
+ unsigned int sizes[], void *alloc_ctxs[])
+{
+ struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+ struct atmel_isi *isi = ici->priv;
+ unsigned long size;
+ int ret;
+
+ /* Reset ISI */
+ ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
+ if (ret < 0) {
+ dev_err(icd->parent, "Reset ISI timed out\n");
+ return ret;
+ }
+ /* Disable all interrupts */
+ isi_writel(isi, ISI_INTDIS, ~0UL);
+
+ size = icd->sizeimage;
+
+ if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM)
+ *nbuffers = MAX_BUFFER_NUM;
+
+ if (size * *nbuffers > VID_LIMIT_BYTES)
+ *nbuffers = VID_LIMIT_BYTES / size;
+
+ *nplanes = 1;
+ sizes[0] = size;
+ alloc_ctxs[0] = isi->alloc_ctx;
+
+ isi->sequence = 0;
+ isi->active = NULL;
+
+ dev_dbg(icd->parent, "%s, count=%d, size=%ld\n", __func__,
+ *nbuffers, size);
+
+ return 0;
+}
+
+static int buffer_init(struct vb2_buffer *vb)
+{
+ struct frame_buffer *buf = container_of(vb, 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 soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
+ struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+ struct atmel_isi *isi = ici->priv;
+ unsigned long size;
+ struct isi_dma_desc *desc;
+
+ size = icd->sizeimage;
+
+ if (vb2_plane_size(vb, 0) < size) {
+ dev_err(icd->parent, "%s data will not fit into plane (%lu < %lu)\n",
+ __func__, vb2_plane_size(vb, 0), size);
+ return -EINVAL;
+ }
+
+ vb2_set_plane_payload(&buf->vb, 0, size);
+
+ if (!buf->p_dma_desc) {
+ if (list_empty(&isi->dma_desc_head)) {
+ dev_err(icd->parent, "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 soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+ struct atmel_isi *isi = ici->priv;
+ struct frame_buffer *buf = container_of(vb, 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_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
+ dev_err(isi->icd->parent, "Already in frame handling.\n");
+ return;
+ }
+
+ isi_writel(isi, ISI_DMA_C_DSCR, 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);
+
+ /* Enable linked list */
+ cfg1 |= isi->pdata->frate | ISI_CFG1_DISCR;
+
+ /* Enable codec path and ISI */
+ ctrl = ISI_CTRL_CDC | ISI_CTRL_EN;
+ isi_writel(isi, ISI_CTRL, ctrl);
+ isi_writel(isi, ISI_CFG1, cfg1);
+}
+
+static void buffer_queue(struct vb2_buffer *vb)
+{
+ struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+ struct atmel_isi *isi = ici->priv;
+ struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(&isi->lock, flags);
+ list_add_tail(&buf->list, &isi->video_buffer_list);
+
+ if (isi->active == NULL) {
+ isi->active = buf;
+ if (vb2_is_streaming(vb->vb2_queue))
+ start_dma(isi, buf);
+ }
+ spin_unlock_irqrestore(&isi->lock, flags);
+}
+
+static int start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+ struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+ struct atmel_isi *isi = ici->priv;
+
+ u32 sr = 0;
+ int ret;
+
+ spin_lock_irq(&isi->lock);
+ isi->state = ISI_STATE_IDLE;
+ /* Clear any pending SOF interrupt */
+ sr = isi_readl(isi, ISI_STATUS);
+ /* Enable VSYNC interrupt for SOF */
+ isi_writel(isi, ISI_INTEN, ISI_SR_VSYNC);
+ isi_writel(isi, ISI_CTRL, ISI_CTRL_EN);
+ spin_unlock_irq(&isi->lock);
+
+ dev_dbg(icd->parent, "Waiting for SOF\n");
+ ret = wait_event_interruptible(isi->vsync_wq,
+ isi->state != ISI_STATE_IDLE);
+ if (ret)
+ goto err;
+
+ if (isi->state != ISI_STATE_READY) {
+ ret = -EIO;
+ goto err;
+ }
+
+ spin_lock_irq(&isi->lock);
+ isi->state = ISI_STATE_WAIT_SOF;
+ isi_writel(isi, ISI_INTDIS, ISI_SR_VSYNC);
+ if (count)
+ start_dma(isi, isi->active);
+ spin_unlock_irq(&isi->lock);
+
+ return 0;
+err:
+ isi->active = NULL;
+ isi->sequence = 0;
+ INIT_LIST_HEAD(&isi->video_buffer_list);
+ return ret;
+}
+
+/* abort streaming and wait for last buffer */
+static int stop_streaming(struct vb2_queue *vq)
+{
+ struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+ struct atmel_isi *isi = ici->priv;
+ struct frame_buffer *buf, *node;
+ int ret = 0;
+ unsigned long timeout;
+
+ spin_lock_irq(&isi->lock);
+ 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_STATE_ERROR);
+ }
+ spin_unlock_irq(&isi->lock);
+
+ 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(icd->parent,
+ "Timeout waiting for finishing codec request\n");
+ return -ETIMEDOUT;
+ }
+
+ /* 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(icd->parent, "Disable ISI timed out\n");
+
+ return ret;
+}
+
+static 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 = soc_camera_unlock,
+ .wait_finish = soc_camera_lock,
+};
+
+/* ------------------------------------------------------------------
+ SOC camera operations for the device
+ ------------------------------------------------------------------*/
+static int isi_camera_init_videobuf(struct vb2_queue *q,
+ struct soc_camera_device *icd)
+{
+ q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ q->io_modes = VB2_MMAP;
+ q->drv_priv = icd;
+ q->buf_struct_size = sizeof(struct frame_buffer);
+ q->ops = &isi_video_qops;
+ q->mem_ops = &vb2_dma_contig_memops;
+
+ return vb2_queue_init(q);
+}
+
+static int isi_camera_set_fmt(struct soc_camera_device *icd,
+ struct v4l2_format *f)
+{
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+ struct atmel_isi *isi = ici->priv;
+ 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;
+
+ xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
+ if (!xlate) {
+ dev_warn(icd->parent, "Format %x not found\n",
+ pix->pixelformat);
+ return -EINVAL;
+ }
+
+ dev_dbg(icd->parent, "Plan to set format %dx%d\n",
+ pix->width, pix->height);
+
+ 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;
+
+ ret = configure_geometry(isi, pix->width, pix->height, xlate->code);
+ if (ret < 0)
+ return ret;
+
+ pix->width = mf.width;
+ pix->height = mf.height;
+ pix->field = mf.field;
+ pix->colorspace = mf.colorspace;
+ icd->current_fmt = xlate;
+
+ dev_dbg(icd->parent, "Finally set format %dx%d\n",
+ pix->width, pix->height);
+
+ return ret;
+}
+
+static int isi_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;
+ u32 pixfmt = pix->pixelformat;
+ int ret;
+
+ xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
+ if (pixfmt && !xlate) {
+ dev_warn(icd->parent, "Format %x not found\n", pixfmt);
+ return -EINVAL;
+ }
+
+ /* limit to Atmel ISI hardware capabilities */
+ if (pix->height > MAX_SUPPORT_HEIGHT)
+ pix->height = MAX_SUPPORT_HEIGHT;
+ if (pix->width > MAX_SUPPORT_WIDTH)
+ pix->width = MAX_SUPPORT_WIDTH;
+
+ /* limit to sensor capabilities */
+ 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, try_mbus_fmt, &mf);
+ if (ret < 0)
+ return ret;
+
+ pix->width = mf.width;
+ pix->height = mf.height;
+ pix->colorspace = mf.colorspace;
+
+ switch (mf.field) {
+ case V4L2_FIELD_ANY:
+ pix->field = V4L2_FIELD_NONE;
+ break;
+ case V4L2_FIELD_NONE:
+ break;
+ default:
+ dev_err(icd->parent, "Field type %d unsupported.\n",
+ mf.field);
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static const struct soc_mbus_pixelfmt isi_camera_formats[] = {
+ {
+ .fourcc = V4L2_PIX_FMT_YUYV,
+ .name = "Packed YUV422 16 bit",
+ .bits_per_sample = 8,
+ .packing = SOC_MBUS_PACKING_2X8_PADHI,
+ .order = SOC_MBUS_ORDER_LE,
+ .layout = SOC_MBUS_LAYOUT_PACKED,
+ },
+};
+
+/* This will be corrected as we get more formats */
+static bool isi_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
+{
+ return fmt->packing == SOC_MBUS_PACKING_NONE ||
+ (fmt->bits_per_sample == 8 &&
+ fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
+ (fmt->bits_per_sample > 8 &&
+ fmt->packing == SOC_MBUS_PACKING_EXTEND16);
+}
+
+#define ISI_BUS_PARAM (V4L2_MBUS_MASTER | \
+ V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
+ V4L2_MBUS_HSYNC_ACTIVE_LOW | \
+ 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)
+
+static int isi_camera_try_bus_param(struct soc_camera_device *icd,
+ unsigned char buswidth)
+{
+ struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+ struct atmel_isi *isi = ici->priv;
+ struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
+ unsigned long common_flags;
+ int ret;
+
+ ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
+ if (!ret) {
+ common_flags = soc_mbus_config_compatible(&cfg,
+ ISI_BUS_PARAM);
+ if (!common_flags) {
+ dev_warn(icd->parent,
+ "Flags incompatible: camera 0x%x, host 0x%x\n",
+ cfg.flags, ISI_BUS_PARAM);
+ return -EINVAL;
+ }
+ } else if (ret != -ENOIOCTLCMD) {
+ return ret;
+ }
+
+ if ((1 << (buswidth - 1)) & isi->width_flags)
+ return 0;
+ return -EINVAL;
+}
+
+
+static int isi_camera_get_formats(struct soc_camera_device *icd,
+ unsigned int idx,
+ struct soc_camera_format_xlate *xlate)
+{
+ struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+ int formats = 0, ret;
+ /* sensor format */
+ enum v4l2_mbus_pixelcode code;
+ /* soc camera host format */
+ const struct soc_mbus_pixelfmt *fmt;
+
+ ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
+ if (ret < 0)
+ /* No more formats */
+ return 0;
+
+ fmt = soc_mbus_get_fmtdesc(code);
+ if (!fmt) {
+ dev_err(icd->parent,
+ "Invalid format code #%u: %d\n", idx, code);
+ return 0;
+ }
+
+ /* This also checks support for the requested bits-per-sample */
+ ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample);
+ if (ret < 0) {
+ dev_err(icd->parent,
+ "Fail to try the bus parameters.\n");
+ return 0;
+ }
+
+ switch (code) {
+ case V4L2_MBUS_FMT_UYVY8_2X8:
+ case V4L2_MBUS_FMT_VYUY8_2X8:
+ case V4L2_MBUS_FMT_YUYV8_2X8:
+ case V4L2_MBUS_FMT_YVYU8_2X8:
+ formats++;
+ if (xlate) {
+ xlate->host_fmt = &isi_camera_formats[0];
+ xlate->code = code;
+ xlate++;
+ dev_dbg(icd->parent, "Providing format %s using code %d\n",
+ isi_camera_formats[0].name, code);
+ }
+ break;
+ default:
+ if (!isi_camera_packing_supported(fmt))
+ return 0;
+ if (xlate)
+ dev_dbg(icd->parent,
+ "Providing format %s in pass-through mode\n",
+ fmt->name);
+ }
+
+ /* Generic pass-through */
+ formats++;
+ if (xlate) {
+ xlate->host_fmt = fmt;
+ xlate->code = code;
+ xlate++;
+ }
+
+ return formats;
+}
+
+/* Called with .video_lock held */
+static int isi_camera_add_device(struct soc_camera_device *icd)
+{
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+ struct atmel_isi *isi = ici->priv;
+ int ret;
+
+ if (isi->icd)
+ return -EBUSY;
+
+ ret = clk_enable(isi->pclk);
+ if (ret)
+ return ret;
+
+ ret = clk_enable(isi->mck);
+ if (ret) {
+ clk_disable(isi->pclk);
+ return ret;
+ }
+
+ isi->icd = icd;
+ dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n",
+ icd->devnum);
+ return 0;
+}
+/* Called with .video_lock held */
+static void isi_camera_remove_device(struct soc_camera_device *icd)
+{
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+ struct atmel_isi *isi = ici->priv;
+
+ BUG_ON(icd != isi->icd);
+
+ clk_disable(isi->mck);
+ clk_disable(isi->pclk);
+ isi->icd = NULL;
+
+ dev_dbg(icd->parent, "Atmel ISI Camera driver detached from camera %d\n",
+ icd->devnum);
+}
+
+static unsigned int isi_camera_poll(struct file *file, poll_table *pt)
+{
+ struct soc_camera_device *icd = file->private_data;
+
+ return vb2_poll(&icd->vb2_vidq, file, pt);
+}
+
+static int isi_camera_querycap(struct soc_camera_host *ici,
+ struct v4l2_capability *cap)
+{
+ strcpy(cap->driver, "atmel-isi");
+ strcpy(cap->card, "Atmel Image Sensor Interface");
+ cap->capabilities = (V4L2_CAP_VIDEO_CAPTURE |
+ V4L2_CAP_STREAMING);
+ return 0;
+}
+
+static int isi_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 atmel_isi *isi = ici->priv;
+ struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
+ unsigned long common_flags;
+ int ret;
+ u32 cfg1 = 0;
+
+ ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
+ if (!ret) {
+ common_flags = soc_mbus_config_compatible(&cfg,
+ ISI_BUS_PARAM);
+ if (!common_flags) {
+ dev_warn(icd->parent,
+ "Flags incompatible: camera 0x%x, host 0x%x\n",
+ cfg.flags, ISI_BUS_PARAM);
+ return -EINVAL;
+ }
+ } else if (ret != -ENOIOCTLCMD) {
+ return ret;
+ } else {
+ common_flags = ISI_BUS_PARAM;
+ }
+ dev_dbg(icd->parent, "Flags cam: 0x%x host: 0x%x common: 0x%lx\n",
+ cfg.flags, ISI_BUS_PARAM, common_flags);
+
+ /* Make choises, based on platform preferences */
+ if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
+ (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
+ if (isi->pdata->hsync_act_low)
+ common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
+ else
+ common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
+ }
+
+ if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
+ (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
+ if (isi->pdata->vsync_act_low)
+ common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
+ else
+ common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
+ }
+
+ if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
+ (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
+ if (isi->pdata->pclk_act_falling)
+ common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
+ else
+ common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
+ }
+
+ 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;
+ }
+
+ /* set bus param for ISI */
+ if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
+ cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
+ if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
+ cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
+ if (common_flags & V4L2_MBUS_PCLK_SAMPLE_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;
+
+ isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
+ isi_writel(isi, ISI_CFG1, cfg1);
+
+ return 0;
+}
+
+static struct soc_camera_host_ops isi_soc_camera_host_ops = {
+ .owner = THIS_MODULE,
+ .add = isi_camera_add_device,
+ .remove = isi_camera_remove_device,
+ .set_fmt = isi_camera_set_fmt,
+ .try_fmt = isi_camera_try_fmt,
+ .get_formats = isi_camera_get_formats,
+ .init_videobuf2 = isi_camera_init_videobuf,
+ .poll = isi_camera_poll,
+ .querycap = isi_camera_querycap,
+ .set_bus_param = isi_camera_set_bus_param,
+};
+
+/* -----------------------------------------------------------------------*/
+static int __devexit atmel_isi_remove(struct platform_device *pdev)
+{
+ struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
+ struct atmel_isi *isi = container_of(soc_host,
+ struct atmel_isi, soc_host);
+
+ free_irq(isi->irq, isi);
+ soc_camera_host_unregister(soc_host);
+ vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
+ dma_free_coherent(&pdev->dev,
+ sizeof(struct fbd) * MAX_BUFFER_NUM,
+ isi->p_fb_descriptors,
+ isi->fb_descriptors_phys);
+
+ iounmap(isi->regs);
+ clk_unprepare(isi->mck);
+ clk_put(isi->mck);
+ clk_unprepare(isi->pclk);
+ clk_put(isi->pclk);
+ kfree(isi);
+
+ return 0;
+}
+
+static int __devinit atmel_isi_probe(struct platform_device *pdev)
+{
+ unsigned int irq;
+ struct atmel_isi *isi;
+ struct clk *pclk;
+ struct resource *regs;
+ int ret, i;
+ struct device *dev = &pdev->dev;
+ struct soc_camera_host *soc_host;
+ struct isi_platform_data *pdata;
+
+ pdata = dev->platform_data;
+ if (!pdata || !pdata->data_width_flags || !pdata->mck_hz) {
+ dev_err(&pdev->dev,
+ "No config available for Atmel ISI\n");
+ return -EINVAL;
+ }
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!regs)
+ return -ENXIO;
+
+ pclk = clk_get(&pdev->dev, "isi_clk");
+ if (IS_ERR(pclk))
+ return PTR_ERR(pclk);
+
+ ret = clk_prepare(pclk);
+ if (ret)
+ goto err_clk_prepare_pclk;
+
+ isi = kzalloc(sizeof(struct atmel_isi), GFP_KERNEL);
+ if (!isi) {
+ ret = -ENOMEM;
+ dev_err(&pdev->dev, "Can't allocate interface!\n");
+ goto err_alloc_isi;
+ }
+
+ isi->pclk = pclk;
+ isi->pdata = pdata;
+ isi->active = NULL;
+ spin_lock_init(&isi->lock);
+ init_waitqueue_head(&isi->vsync_wq);
+ INIT_LIST_HEAD(&isi->video_buffer_list);
+ INIT_LIST_HEAD(&isi->dma_desc_head);
+
+ /* Get ISI_MCK, provided by programmable clock or external clock */
+ isi->mck = clk_get(dev, "isi_mck");
+ if (IS_ERR(isi->mck)) {
+ dev_err(dev, "Failed to get isi_mck\n");
+ ret = PTR_ERR(isi->mck);
+ goto err_clk_get;
+ }
+
+ ret = clk_prepare(isi->mck);
+ if (ret)
+ goto err_clk_prepare_mck;
+
+ /* Set ISI_MCK's frequency, it should be faster than pixel clock */
+ ret = clk_set_rate(isi->mck, pdata->mck_hz);
+ if (ret < 0)
+ goto err_set_mck_rate;
+
+ isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
+ sizeof(struct fbd) * MAX_BUFFER_NUM,
+ &isi->fb_descriptors_phys,
+ GFP_KERNEL);
+ if (!isi->p_fb_descriptors) {
+ ret = -ENOMEM;
+ dev_err(&pdev->dev, "Can't allocate descriptors!\n");
+ goto err_alloc_descriptors;
+ }
+
+ for (i = 0; i < MAX_BUFFER_NUM; 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);
+ }
+
+ isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
+ if (IS_ERR(isi->alloc_ctx)) {
+ ret = PTR_ERR(isi->alloc_ctx);
+ goto err_alloc_ctx;
+ }
+
+ isi->regs = ioremap(regs->start, resource_size(regs));
+ if (!isi->regs) {
+ ret = -ENOMEM;
+ goto err_ioremap;
+ }
+
+ if (pdata->data_width_flags & ISI_DATAWIDTH_8)
+ isi->width_flags = 1 << 7;
+ if (pdata->data_width_flags & ISI_DATAWIDTH_10)
+ isi->width_flags |= 1 << 9;
+
+ isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ ret = irq;
+ goto err_req_irq;
+ }
+
+ ret = request_irq(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;
+
+ soc_host = &isi->soc_host;
+ soc_host->drv_name = "isi-camera";
+ soc_host->ops = &isi_soc_camera_host_ops;
+ soc_host->priv = isi;
+ soc_host->v4l2_dev.dev = &pdev->dev;
+ soc_host->nr = pdev->id;
+
+ ret = soc_camera_host_register(soc_host);
+ if (ret) {
+ dev_err(&pdev->dev, "Unable to register soc camera host\n");
+ goto err_register_soc_camera_host;
+ }
+ return 0;
+
+err_register_soc_camera_host:
+ free_irq(isi->irq, isi);
+err_req_irq:
+ iounmap(isi->regs);
+err_ioremap:
+ vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
+err_alloc_ctx:
+ dma_free_coherent(&pdev->dev,
+ sizeof(struct fbd) * MAX_BUFFER_NUM,
+ isi->p_fb_descriptors,
+ isi->fb_descriptors_phys);
+err_alloc_descriptors:
+err_set_mck_rate:
+ clk_unprepare(isi->mck);
+err_clk_prepare_mck:
+ clk_put(isi->mck);
+err_clk_get:
+ kfree(isi);
+err_alloc_isi:
+ clk_unprepare(pclk);
+err_clk_prepare_pclk:
+ clk_put(pclk);
+
+ return ret;
+}
+
+static struct platform_driver atmel_isi_driver = {
+ .probe = atmel_isi_probe,
+ .remove = __devexit_p(atmel_isi_remove),
+ .driver = {
+ .name = "atmel_isi",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init atmel_isi_init_module(void)
+{
+ return platform_driver_probe(&atmel_isi_driver, &atmel_isi_probe);
+}
+
+static void __exit atmel_isi_exit(void)
+{
+ platform_driver_unregister(&atmel_isi_driver);
+}
+module_init(atmel_isi_init_module);
+module_exit(atmel_isi_exit);
+
+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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