ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/media/platform/via-camera.c b/marvell/linux/drivers/media/platform/via-camera.c
new file mode 100644
index 0000000..78841b9
--- /dev/null
+++ b/marvell/linux/drivers/media/platform/via-camera.c
@@ -0,0 +1,1320 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for the VIA Chrome integrated camera controller.
+ *
+ * Copyright 2009,2010 Jonathan Corbet <corbet@lwn.net>
+ *
+ * This work was supported by the One Laptop Per Child project
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/pci.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-image-sizes.h>
+#include <media/i2c/ov7670.h>
+#include <media/videobuf2-dma-sg.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/pm_qos.h>
+#include <linux/via-core.h>
+#include <linux/via-gpio.h>
+#include <linux/via_i2c.h>
+
+#ifdef CONFIG_X86
+#include <asm/olpc.h>
+#else
+#define machine_is_olpc(x) 0
+#endif
+
+#include "via-camera.h"
+
+MODULE_ALIAS("platform:viafb-camera");
+MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
+MODULE_DESCRIPTION("VIA framebuffer-based camera controller driver");
+MODULE_LICENSE("GPL");
+
+static bool flip_image;
+module_param(flip_image, bool, 0444);
+MODULE_PARM_DESC(flip_image,
+ "If set, the sensor will be instructed to flip the image vertically.");
+
+static bool override_serial;
+module_param(override_serial, bool, 0444);
+MODULE_PARM_DESC(override_serial,
+ "The camera driver will normally refuse to load if the XO 1.5 serial port is enabled. Set this option to force-enable the camera.");
+
+/*
+ * The structure describing our camera.
+ */
+enum viacam_opstate { S_IDLE = 0, S_RUNNING = 1 };
+
+struct via_camera {
+ struct v4l2_device v4l2_dev;
+ struct v4l2_ctrl_handler ctrl_handler;
+ struct video_device vdev;
+ struct v4l2_subdev *sensor;
+ struct platform_device *platdev;
+ struct viafb_dev *viadev;
+ struct mutex lock;
+ enum viacam_opstate opstate;
+ unsigned long flags;
+ struct pm_qos_request qos_request;
+ /*
+ * GPIO info for power/reset management
+ */
+ int power_gpio;
+ int reset_gpio;
+ /*
+ * I/O memory stuff.
+ */
+ void __iomem *mmio; /* Where the registers live */
+ void __iomem *fbmem; /* Frame buffer memory */
+ u32 fb_offset; /* Reserved memory offset (FB) */
+ /*
+ * Capture buffers and related. The controller supports
+ * up to three, so that's what we have here. These buffers
+ * live in frame buffer memory, so we don't call them "DMA".
+ */
+ unsigned int cb_offsets[3]; /* offsets into fb mem */
+ u8 __iomem *cb_addrs[3]; /* Kernel-space addresses */
+ int n_cap_bufs; /* How many are we using? */
+ struct vb2_queue vq;
+ struct list_head buffer_queue;
+ u32 sequence;
+ /*
+ * Video format information. sensor_format is kept in a form
+ * that we can use to pass to the sensor. We always run the
+ * sensor in VGA resolution, though, and let the controller
+ * downscale things if need be. So we keep the "real*
+ * dimensions separately.
+ */
+ struct v4l2_pix_format sensor_format;
+ struct v4l2_pix_format user_format;
+ u32 mbus_code;
+};
+
+/* buffer for one video frame */
+struct via_buffer {
+ /* common v4l buffer stuff -- must be first */
+ struct vb2_v4l2_buffer vbuf;
+ struct list_head queue;
+};
+
+/*
+ * Yes, this is a hack, but there's only going to be one of these
+ * on any system we know of.
+ */
+static struct via_camera *via_cam_info;
+
+/*
+ * Flag values, manipulated with bitops
+ */
+#define CF_DMA_ACTIVE 0 /* A frame is incoming */
+#define CF_CONFIG_NEEDED 1 /* Must configure hardware */
+
+
+/*
+ * Nasty ugly v4l2 boilerplate.
+ */
+#define sensor_call(cam, optype, func, args...) \
+ v4l2_subdev_call(cam->sensor, optype, func, ##args)
+
+/*
+ * Debugging and related.
+ */
+#define cam_err(cam, fmt, arg...) \
+ dev_err(&(cam)->platdev->dev, fmt, ##arg);
+#define cam_warn(cam, fmt, arg...) \
+ dev_warn(&(cam)->platdev->dev, fmt, ##arg);
+#define cam_dbg(cam, fmt, arg...) \
+ dev_dbg(&(cam)->platdev->dev, fmt, ##arg);
+
+/*
+ * Format handling. This is ripped almost directly from Hans's changes
+ * to cafe_ccic.c. It's a little unfortunate; until this change, we
+ * didn't need to know anything about the format except its byte depth;
+ * now this information must be managed at this level too.
+ */
+static struct via_format {
+ __u32 pixelformat;
+ int bpp; /* Bytes per pixel */
+ u32 mbus_code;
+} via_formats[] = {
+ {
+ .pixelformat = V4L2_PIX_FMT_YUYV,
+ .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
+ .bpp = 2,
+ },
+ /* RGB444 and Bayer should be doable, but have never been
+ tested with this driver. RGB565 seems to work at the default
+ resolution, but results in color corruption when being scaled by
+ viacam_set_scaled(), and is disabled as a result. */
+};
+#define N_VIA_FMTS ARRAY_SIZE(via_formats)
+
+static struct via_format *via_find_format(u32 pixelformat)
+{
+ unsigned i;
+
+ for (i = 0; i < N_VIA_FMTS; i++)
+ if (via_formats[i].pixelformat == pixelformat)
+ return via_formats + i;
+ /* Not found? Then return the first format. */
+ return via_formats;
+}
+
+
+/*--------------------------------------------------------------------------*/
+/*
+ * Sensor power/reset management. This piece is OLPC-specific for
+ * sure; other configurations will have things connected differently.
+ */
+static int via_sensor_power_setup(struct via_camera *cam)
+{
+ int ret;
+
+ cam->power_gpio = viafb_gpio_lookup("VGPIO3");
+ cam->reset_gpio = viafb_gpio_lookup("VGPIO2");
+ if (!gpio_is_valid(cam->power_gpio) || !gpio_is_valid(cam->reset_gpio)) {
+ dev_err(&cam->platdev->dev, "Unable to find GPIO lines\n");
+ return -EINVAL;
+ }
+ ret = gpio_request(cam->power_gpio, "viafb-camera");
+ if (ret) {
+ dev_err(&cam->platdev->dev, "Unable to request power GPIO\n");
+ return ret;
+ }
+ ret = gpio_request(cam->reset_gpio, "viafb-camera");
+ if (ret) {
+ dev_err(&cam->platdev->dev, "Unable to request reset GPIO\n");
+ gpio_free(cam->power_gpio);
+ return ret;
+ }
+ gpio_direction_output(cam->power_gpio, 0);
+ gpio_direction_output(cam->reset_gpio, 0);
+ return 0;
+}
+
+/*
+ * Power up the sensor and perform the reset dance.
+ */
+static void via_sensor_power_up(struct via_camera *cam)
+{
+ gpio_set_value(cam->power_gpio, 1);
+ gpio_set_value(cam->reset_gpio, 0);
+ msleep(20); /* Probably excessive */
+ gpio_set_value(cam->reset_gpio, 1);
+ msleep(20);
+}
+
+static void via_sensor_power_down(struct via_camera *cam)
+{
+ gpio_set_value(cam->power_gpio, 0);
+ gpio_set_value(cam->reset_gpio, 0);
+}
+
+
+static void via_sensor_power_release(struct via_camera *cam)
+{
+ via_sensor_power_down(cam);
+ gpio_free(cam->power_gpio);
+ gpio_free(cam->reset_gpio);
+}
+
+/* --------------------------------------------------------------------------*/
+/* Sensor ops */
+
+/*
+ * Manage the ov7670 "flip" bit, which needs special help.
+ */
+static int viacam_set_flip(struct via_camera *cam)
+{
+ struct v4l2_control ctrl;
+
+ memset(&ctrl, 0, sizeof(ctrl));
+ ctrl.id = V4L2_CID_VFLIP;
+ ctrl.value = flip_image;
+ return v4l2_s_ctrl(NULL, cam->sensor->ctrl_handler, &ctrl);
+}
+
+/*
+ * Configure the sensor. It's up to the caller to ensure
+ * that the camera is in the correct operating state.
+ */
+static int viacam_configure_sensor(struct via_camera *cam)
+{
+ struct v4l2_subdev_format format = {
+ .which = V4L2_SUBDEV_FORMAT_ACTIVE,
+ };
+ int ret;
+
+ v4l2_fill_mbus_format(&format.format, &cam->sensor_format, cam->mbus_code);
+ ret = sensor_call(cam, core, init, 0);
+ if (ret == 0)
+ ret = sensor_call(cam, pad, set_fmt, NULL, &format);
+ /*
+ * OV7670 does weird things if flip is set *before* format...
+ */
+ if (ret == 0)
+ ret = viacam_set_flip(cam);
+ return ret;
+}
+
+
+
+/* --------------------------------------------------------------------------*/
+/*
+ * Some simple register accessors; they assume that the lock is held.
+ *
+ * Should we want to support the second capture engine, we could
+ * hide the register difference by adding 0x1000 to registers in the
+ * 0x300-350 range.
+ */
+static inline void viacam_write_reg(struct via_camera *cam,
+ int reg, int value)
+{
+ iowrite32(value, cam->mmio + reg);
+}
+
+static inline int viacam_read_reg(struct via_camera *cam, int reg)
+{
+ return ioread32(cam->mmio + reg);
+}
+
+static inline void viacam_write_reg_mask(struct via_camera *cam,
+ int reg, int value, int mask)
+{
+ int tmp = viacam_read_reg(cam, reg);
+
+ tmp = (tmp & ~mask) | (value & mask);
+ viacam_write_reg(cam, reg, tmp);
+}
+
+
+/* --------------------------------------------------------------------------*/
+/* Interrupt management and handling */
+
+static irqreturn_t viacam_quick_irq(int irq, void *data)
+{
+ struct via_camera *cam = data;
+ irqreturn_t ret = IRQ_NONE;
+ int icv;
+
+ /*
+ * All we do here is to clear the interrupts and tell
+ * the handler thread to wake up.
+ */
+ spin_lock(&cam->viadev->reg_lock);
+ icv = viacam_read_reg(cam, VCR_INTCTRL);
+ if (icv & VCR_IC_EAV) {
+ icv |= VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL;
+ viacam_write_reg(cam, VCR_INTCTRL, icv);
+ ret = IRQ_WAKE_THREAD;
+ }
+ spin_unlock(&cam->viadev->reg_lock);
+ return ret;
+}
+
+/*
+ * Find the next buffer which has somebody waiting on it.
+ */
+static struct via_buffer *viacam_next_buffer(struct via_camera *cam)
+{
+ if (cam->opstate != S_RUNNING)
+ return NULL;
+ if (list_empty(&cam->buffer_queue))
+ return NULL;
+ return list_entry(cam->buffer_queue.next, struct via_buffer, queue);
+}
+
+/*
+ * The threaded IRQ handler.
+ */
+static irqreturn_t viacam_irq(int irq, void *data)
+{
+ struct via_camera *cam = data;
+ struct via_buffer *vb;
+ int bufn;
+ struct sg_table *sgt;
+
+ mutex_lock(&cam->lock);
+ /*
+ * If there is no place to put the data frame, don't bother
+ * with anything else.
+ */
+ vb = viacam_next_buffer(cam);
+ if (vb == NULL)
+ goto done;
+ /*
+ * Figure out which buffer we just completed.
+ */
+ bufn = (viacam_read_reg(cam, VCR_INTCTRL) & VCR_IC_ACTBUF) >> 3;
+ bufn -= 1;
+ if (bufn < 0)
+ bufn = cam->n_cap_bufs - 1;
+ /*
+ * Copy over the data and let any waiters know.
+ */
+ sgt = vb2_dma_sg_plane_desc(&vb->vbuf.vb2_buf, 0);
+ vb->vbuf.vb2_buf.timestamp = ktime_get_ns();
+ viafb_dma_copy_out_sg(cam->cb_offsets[bufn], sgt->sgl, sgt->nents);
+ vb->vbuf.sequence = cam->sequence++;
+ vb->vbuf.field = V4L2_FIELD_NONE;
+ list_del(&vb->queue);
+ vb2_buffer_done(&vb->vbuf.vb2_buf, VB2_BUF_STATE_DONE);
+done:
+ mutex_unlock(&cam->lock);
+ return IRQ_HANDLED;
+}
+
+
+/*
+ * These functions must mess around with the general interrupt
+ * control register, which is relevant to much more than just the
+ * camera. Nothing else uses interrupts, though, as of this writing.
+ * Should that situation change, we'll have to improve support at
+ * the via-core level.
+ */
+static void viacam_int_enable(struct via_camera *cam)
+{
+ viacam_write_reg(cam, VCR_INTCTRL,
+ VCR_IC_INTEN|VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL);
+ viafb_irq_enable(VDE_I_C0AVEN);
+}
+
+static void viacam_int_disable(struct via_camera *cam)
+{
+ viafb_irq_disable(VDE_I_C0AVEN);
+ viacam_write_reg(cam, VCR_INTCTRL, 0);
+}
+
+
+
+/* --------------------------------------------------------------------------*/
+/* Controller operations */
+
+/*
+ * Set up our capture buffers in framebuffer memory.
+ */
+static int viacam_ctlr_cbufs(struct via_camera *cam)
+{
+ int nbuf = cam->viadev->camera_fbmem_size/cam->sensor_format.sizeimage;
+ int i;
+ unsigned int offset;
+
+ /*
+ * See how many buffers we can work with.
+ */
+ if (nbuf >= 3) {
+ cam->n_cap_bufs = 3;
+ viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_3BUFS,
+ VCR_CI_3BUFS);
+ } else if (nbuf == 2) {
+ cam->n_cap_bufs = 2;
+ viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_3BUFS);
+ } else {
+ cam_warn(cam, "Insufficient frame buffer memory\n");
+ return -ENOMEM;
+ }
+ /*
+ * Set them up.
+ */
+ offset = cam->fb_offset;
+ for (i = 0; i < cam->n_cap_bufs; i++) {
+ cam->cb_offsets[i] = offset;
+ cam->cb_addrs[i] = cam->fbmem + offset;
+ viacam_write_reg(cam, VCR_VBUF1 + i*4, offset & VCR_VBUF_MASK);
+ offset += cam->sensor_format.sizeimage;
+ }
+ return 0;
+}
+
+/*
+ * Set the scaling register for downscaling the image.
+ *
+ * This register works like this... Vertical scaling is enabled
+ * by bit 26; if that bit is set, downscaling is controlled by the
+ * value in bits 16:25. Those bits are divided by 1024 to get
+ * the scaling factor; setting just bit 25 thus cuts the height
+ * in half.
+ *
+ * Horizontal scaling works about the same, but it's enabled by
+ * bit 11, with bits 0:10 giving the numerator of a fraction
+ * (over 2048) for the scaling value.
+ *
+ * This function is naive in that, if the user departs from
+ * the 3x4 VGA scaling factor, the image will distort. We
+ * could work around that if it really seemed important.
+ */
+static void viacam_set_scale(struct via_camera *cam)
+{
+ unsigned int avscale;
+ int sf;
+
+ if (cam->user_format.width == VGA_WIDTH)
+ avscale = 0;
+ else {
+ sf = (cam->user_format.width*2048)/VGA_WIDTH;
+ avscale = VCR_AVS_HEN | sf;
+ }
+ if (cam->user_format.height < VGA_HEIGHT) {
+ sf = (1024*cam->user_format.height)/VGA_HEIGHT;
+ avscale |= VCR_AVS_VEN | (sf << 16);
+ }
+ viacam_write_reg(cam, VCR_AVSCALE, avscale);
+}
+
+
+/*
+ * Configure image-related information into the capture engine.
+ */
+static void viacam_ctlr_image(struct via_camera *cam)
+{
+ int cicreg;
+
+ /*
+ * Disable clock before messing with stuff - from the via
+ * sample driver.
+ */
+ viacam_write_reg(cam, VCR_CAPINTC, ~(VCR_CI_ENABLE|VCR_CI_CLKEN));
+ /*
+ * Set up the controller for VGA resolution, modulo magic
+ * offsets from the via sample driver.
+ */
+ viacam_write_reg(cam, VCR_HORRANGE, 0x06200120);
+ viacam_write_reg(cam, VCR_VERTRANGE, 0x01de0000);
+ viacam_set_scale(cam);
+ /*
+ * Image size info.
+ */
+ viacam_write_reg(cam, VCR_MAXDATA,
+ (cam->sensor_format.height << 16) |
+ (cam->sensor_format.bytesperline >> 3));
+ viacam_write_reg(cam, VCR_MAXVBI, 0);
+ viacam_write_reg(cam, VCR_VSTRIDE,
+ cam->user_format.bytesperline & VCR_VS_STRIDE);
+ /*
+ * Set up the capture interface control register,
+ * everything but the "go" bit.
+ *
+ * The FIFO threshold is a bit of a magic number; 8 is what
+ * VIA's sample code uses.
+ */
+ cicreg = VCR_CI_CLKEN |
+ 0x08000000 | /* FIFO threshold */
+ VCR_CI_FLDINV | /* OLPC-specific? */
+ VCR_CI_VREFINV | /* OLPC-specific? */
+ VCR_CI_DIBOTH | /* Capture both fields */
+ VCR_CI_CCIR601_8;
+ if (cam->n_cap_bufs == 3)
+ cicreg |= VCR_CI_3BUFS;
+ /*
+ * YUV formats need different byte swapping than RGB.
+ */
+ if (cam->user_format.pixelformat == V4L2_PIX_FMT_YUYV)
+ cicreg |= VCR_CI_YUYV;
+ else
+ cicreg |= VCR_CI_UYVY;
+ viacam_write_reg(cam, VCR_CAPINTC, cicreg);
+}
+
+
+static int viacam_config_controller(struct via_camera *cam)
+{
+ int ret;
+ unsigned long flags;
+
+ spin_lock_irqsave(&cam->viadev->reg_lock, flags);
+ ret = viacam_ctlr_cbufs(cam);
+ if (!ret)
+ viacam_ctlr_image(cam);
+ spin_unlock_irqrestore(&cam->viadev->reg_lock, flags);
+ clear_bit(CF_CONFIG_NEEDED, &cam->flags);
+ return ret;
+}
+
+/*
+ * Make it start grabbing data.
+ */
+static void viacam_start_engine(struct via_camera *cam)
+{
+ spin_lock_irq(&cam->viadev->reg_lock);
+ viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_ENABLE, VCR_CI_ENABLE);
+ viacam_int_enable(cam);
+ (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */
+ cam->opstate = S_RUNNING;
+ spin_unlock_irq(&cam->viadev->reg_lock);
+}
+
+
+static void viacam_stop_engine(struct via_camera *cam)
+{
+ spin_lock_irq(&cam->viadev->reg_lock);
+ viacam_int_disable(cam);
+ viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_ENABLE);
+ (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */
+ cam->opstate = S_IDLE;
+ spin_unlock_irq(&cam->viadev->reg_lock);
+}
+
+
+/* --------------------------------------------------------------------------*/
+/* vb2 callback ops */
+
+static struct via_buffer *vb2_to_via_buffer(struct vb2_buffer *vb)
+{
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+
+ return container_of(vbuf, struct via_buffer, vbuf);
+}
+
+static void viacam_vb2_queue(struct vb2_buffer *vb)
+{
+ struct via_camera *cam = vb2_get_drv_priv(vb->vb2_queue);
+ struct via_buffer *via = vb2_to_via_buffer(vb);
+
+ list_add_tail(&via->queue, &cam->buffer_queue);
+}
+
+static int viacam_vb2_prepare(struct vb2_buffer *vb)
+{
+ struct via_camera *cam = vb2_get_drv_priv(vb->vb2_queue);
+
+ if (vb2_plane_size(vb, 0) < cam->user_format.sizeimage) {
+ cam_dbg(cam,
+ "Plane size too small (%lu < %u)\n",
+ vb2_plane_size(vb, 0),
+ cam->user_format.sizeimage);
+ return -EINVAL;
+ }
+
+ vb2_set_plane_payload(vb, 0, cam->user_format.sizeimage);
+
+ return 0;
+}
+
+static int viacam_vb2_queue_setup(struct vb2_queue *vq,
+ unsigned int *nbufs,
+ unsigned int *num_planes, unsigned int sizes[],
+ struct device *alloc_devs[])
+{
+ struct via_camera *cam = vb2_get_drv_priv(vq);
+ int size = cam->user_format.sizeimage;
+
+ if (*num_planes)
+ return sizes[0] < size ? -EINVAL : 0;
+
+ *num_planes = 1;
+ sizes[0] = size;
+ return 0;
+}
+
+static int viacam_vb2_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+ struct via_camera *cam = vb2_get_drv_priv(vq);
+ struct via_buffer *buf, *tmp;
+ int ret = 0;
+
+ if (cam->opstate != S_IDLE) {
+ ret = -EBUSY;
+ goto out;
+ }
+ /*
+ * Configure things if need be.
+ */
+ if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) {
+ ret = viacam_configure_sensor(cam);
+ if (ret)
+ goto out;
+ ret = viacam_config_controller(cam);
+ if (ret)
+ goto out;
+ }
+ cam->sequence = 0;
+ /*
+ * If the CPU goes into C3, the DMA transfer gets corrupted and
+ * users start filing unsightly bug reports. Put in a "latency"
+ * requirement which will keep the CPU out of the deeper sleep
+ * states.
+ */
+ pm_qos_add_request(&cam->qos_request, PM_QOS_CPU_DMA_LATENCY, 50);
+ viacam_start_engine(cam);
+ return 0;
+out:
+ list_for_each_entry_safe(buf, tmp, &cam->buffer_queue, queue) {
+ list_del(&buf->queue);
+ vb2_buffer_done(&buf->vbuf.vb2_buf, VB2_BUF_STATE_QUEUED);
+ }
+ return ret;
+}
+
+static void viacam_vb2_stop_streaming(struct vb2_queue *vq)
+{
+ struct via_camera *cam = vb2_get_drv_priv(vq);
+ struct via_buffer *buf, *tmp;
+
+ pm_qos_remove_request(&cam->qos_request);
+ viacam_stop_engine(cam);
+
+ list_for_each_entry_safe(buf, tmp, &cam->buffer_queue, queue) {
+ list_del(&buf->queue);
+ vb2_buffer_done(&buf->vbuf.vb2_buf, VB2_BUF_STATE_ERROR);
+ }
+}
+
+static const struct vb2_ops viacam_vb2_ops = {
+ .queue_setup = viacam_vb2_queue_setup,
+ .buf_queue = viacam_vb2_queue,
+ .buf_prepare = viacam_vb2_prepare,
+ .start_streaming = viacam_vb2_start_streaming,
+ .stop_streaming = viacam_vb2_stop_streaming,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+};
+
+/* --------------------------------------------------------------------------*/
+/* File operations */
+
+static int viacam_open(struct file *filp)
+{
+ struct via_camera *cam = video_drvdata(filp);
+ int ret;
+
+ /*
+ * Note the new user. If this is the first one, we'll also
+ * need to power up the sensor.
+ */
+ mutex_lock(&cam->lock);
+ ret = v4l2_fh_open(filp);
+ if (ret)
+ goto out;
+ if (v4l2_fh_is_singular_file(filp)) {
+ ret = viafb_request_dma();
+
+ if (ret) {
+ v4l2_fh_release(filp);
+ goto out;
+ }
+ via_sensor_power_up(cam);
+ set_bit(CF_CONFIG_NEEDED, &cam->flags);
+ }
+out:
+ mutex_unlock(&cam->lock);
+ return ret;
+}
+
+static int viacam_release(struct file *filp)
+{
+ struct via_camera *cam = video_drvdata(filp);
+ bool last_open;
+
+ mutex_lock(&cam->lock);
+ last_open = v4l2_fh_is_singular_file(filp);
+ _vb2_fop_release(filp, NULL);
+ /*
+ * Last one out needs to turn out the lights.
+ */
+ if (last_open) {
+ via_sensor_power_down(cam);
+ viafb_release_dma();
+ }
+ mutex_unlock(&cam->lock);
+ return 0;
+}
+
+static const struct v4l2_file_operations viacam_fops = {
+ .owner = THIS_MODULE,
+ .open = viacam_open,
+ .release = viacam_release,
+ .read = vb2_fop_read,
+ .poll = vb2_fop_poll,
+ .mmap = vb2_fop_mmap,
+ .unlocked_ioctl = video_ioctl2,
+};
+
+/*----------------------------------------------------------------------------*/
+/*
+ * The long list of v4l2 ioctl ops
+ */
+
+/*
+ * Only one input.
+ */
+static int viacam_enum_input(struct file *filp, void *priv,
+ struct v4l2_input *input)
+{
+ if (input->index != 0)
+ return -EINVAL;
+
+ input->type = V4L2_INPUT_TYPE_CAMERA;
+ strscpy(input->name, "Camera", sizeof(input->name));
+ return 0;
+}
+
+static int viacam_g_input(struct file *filp, void *priv, unsigned int *i)
+{
+ *i = 0;
+ return 0;
+}
+
+static int viacam_s_input(struct file *filp, void *priv, unsigned int i)
+{
+ if (i != 0)
+ return -EINVAL;
+ return 0;
+}
+
+/*
+ * Video format stuff. Here is our default format until
+ * user space messes with things.
+ */
+static const struct v4l2_pix_format viacam_def_pix_format = {
+ .width = VGA_WIDTH,
+ .height = VGA_HEIGHT,
+ .pixelformat = V4L2_PIX_FMT_YUYV,
+ .field = V4L2_FIELD_NONE,
+ .bytesperline = VGA_WIDTH * 2,
+ .sizeimage = VGA_WIDTH * VGA_HEIGHT * 2,
+ .colorspace = V4L2_COLORSPACE_SRGB,
+};
+
+static const u32 via_def_mbus_code = MEDIA_BUS_FMT_YUYV8_2X8;
+
+static int viacam_enum_fmt_vid_cap(struct file *filp, void *priv,
+ struct v4l2_fmtdesc *fmt)
+{
+ if (fmt->index >= N_VIA_FMTS)
+ return -EINVAL;
+ fmt->pixelformat = via_formats[fmt->index].pixelformat;
+ return 0;
+}
+
+/*
+ * Figure out proper image dimensions, but always force the
+ * sensor to VGA.
+ */
+static void viacam_fmt_pre(struct v4l2_pix_format *userfmt,
+ struct v4l2_pix_format *sensorfmt)
+{
+ *sensorfmt = *userfmt;
+ if (userfmt->width < QCIF_WIDTH || userfmt->height < QCIF_HEIGHT) {
+ userfmt->width = QCIF_WIDTH;
+ userfmt->height = QCIF_HEIGHT;
+ }
+ if (userfmt->width > VGA_WIDTH || userfmt->height > VGA_HEIGHT) {
+ userfmt->width = VGA_WIDTH;
+ userfmt->height = VGA_HEIGHT;
+ }
+ sensorfmt->width = VGA_WIDTH;
+ sensorfmt->height = VGA_HEIGHT;
+}
+
+static void viacam_fmt_post(struct v4l2_pix_format *userfmt,
+ struct v4l2_pix_format *sensorfmt)
+{
+ struct via_format *f = via_find_format(userfmt->pixelformat);
+
+ sensorfmt->bytesperline = sensorfmt->width * f->bpp;
+ sensorfmt->sizeimage = sensorfmt->height * sensorfmt->bytesperline;
+ userfmt->pixelformat = sensorfmt->pixelformat;
+ userfmt->field = sensorfmt->field;
+ userfmt->bytesperline = 2 * userfmt->width;
+ userfmt->sizeimage = userfmt->bytesperline * userfmt->height;
+ userfmt->colorspace = sensorfmt->colorspace;
+ userfmt->ycbcr_enc = sensorfmt->ycbcr_enc;
+ userfmt->quantization = sensorfmt->quantization;
+ userfmt->xfer_func = sensorfmt->xfer_func;
+}
+
+
+/*
+ * The real work of figuring out a workable format.
+ */
+static int viacam_do_try_fmt(struct via_camera *cam,
+ struct v4l2_pix_format *upix, struct v4l2_pix_format *spix)
+{
+ int ret;
+ struct v4l2_subdev_pad_config pad_cfg;
+ struct v4l2_subdev_format format = {
+ .which = V4L2_SUBDEV_FORMAT_TRY,
+ };
+ struct via_format *f = via_find_format(upix->pixelformat);
+
+ upix->pixelformat = f->pixelformat;
+ viacam_fmt_pre(upix, spix);
+ v4l2_fill_mbus_format(&format.format, spix, f->mbus_code);
+ ret = sensor_call(cam, pad, set_fmt, &pad_cfg, &format);
+ v4l2_fill_pix_format(spix, &format.format);
+ viacam_fmt_post(upix, spix);
+ return ret;
+}
+
+
+
+static int viacam_try_fmt_vid_cap(struct file *filp, void *priv,
+ struct v4l2_format *fmt)
+{
+ struct via_camera *cam = video_drvdata(filp);
+ struct v4l2_format sfmt;
+
+ return viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix);
+}
+
+
+static int viacam_g_fmt_vid_cap(struct file *filp, void *priv,
+ struct v4l2_format *fmt)
+{
+ struct via_camera *cam = video_drvdata(filp);
+
+ fmt->fmt.pix = cam->user_format;
+ return 0;
+}
+
+static int viacam_s_fmt_vid_cap(struct file *filp, void *priv,
+ struct v4l2_format *fmt)
+{
+ struct via_camera *cam = video_drvdata(filp);
+ int ret;
+ struct v4l2_format sfmt;
+ struct via_format *f = via_find_format(fmt->fmt.pix.pixelformat);
+
+ /*
+ * Camera must be idle or we can't mess with the
+ * video setup.
+ */
+ if (cam->opstate != S_IDLE)
+ return -EBUSY;
+ /*
+ * Let the sensor code look over and tweak the
+ * requested formatting.
+ */
+ ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix);
+ if (ret)
+ return ret;
+ /*
+ * OK, let's commit to the new format.
+ */
+ cam->user_format = fmt->fmt.pix;
+ cam->sensor_format = sfmt.fmt.pix;
+ cam->mbus_code = f->mbus_code;
+ ret = viacam_configure_sensor(cam);
+ if (!ret)
+ ret = viacam_config_controller(cam);
+ return ret;
+}
+
+static int viacam_querycap(struct file *filp, void *priv,
+ struct v4l2_capability *cap)
+{
+ strscpy(cap->driver, "via-camera", sizeof(cap->driver));
+ strscpy(cap->card, "via-camera", sizeof(cap->card));
+ strscpy(cap->bus_info, "platform:via-camera", sizeof(cap->bus_info));
+ return 0;
+}
+
+/* G/S_PARM */
+
+static int viacam_g_parm(struct file *filp, void *priv,
+ struct v4l2_streamparm *parm)
+{
+ struct via_camera *cam = video_drvdata(filp);
+
+ return v4l2_g_parm_cap(video_devdata(filp), cam->sensor, parm);
+}
+
+static int viacam_s_parm(struct file *filp, void *priv,
+ struct v4l2_streamparm *parm)
+{
+ struct via_camera *cam = video_drvdata(filp);
+
+ return v4l2_s_parm_cap(video_devdata(filp), cam->sensor, parm);
+}
+
+static int viacam_enum_framesizes(struct file *filp, void *priv,
+ struct v4l2_frmsizeenum *sizes)
+{
+ unsigned int i;
+
+ if (sizes->index != 0)
+ return -EINVAL;
+ for (i = 0; i < N_VIA_FMTS; i++)
+ if (sizes->pixel_format == via_formats[i].pixelformat)
+ break;
+ if (i >= N_VIA_FMTS)
+ return -EINVAL;
+ sizes->type = V4L2_FRMSIZE_TYPE_CONTINUOUS;
+ sizes->stepwise.min_width = QCIF_WIDTH;
+ sizes->stepwise.min_height = QCIF_HEIGHT;
+ sizes->stepwise.max_width = VGA_WIDTH;
+ sizes->stepwise.max_height = VGA_HEIGHT;
+ sizes->stepwise.step_width = sizes->stepwise.step_height = 1;
+ return 0;
+}
+
+static int viacam_enum_frameintervals(struct file *filp, void *priv,
+ struct v4l2_frmivalenum *interval)
+{
+ struct via_camera *cam = video_drvdata(filp);
+ struct v4l2_subdev_frame_interval_enum fie = {
+ .index = interval->index,
+ .code = cam->mbus_code,
+ .width = cam->sensor_format.width,
+ .height = cam->sensor_format.height,
+ .which = V4L2_SUBDEV_FORMAT_ACTIVE,
+ };
+ unsigned int i;
+ int ret;
+
+ for (i = 0; i < N_VIA_FMTS; i++)
+ if (interval->pixel_format == via_formats[i].pixelformat)
+ break;
+ if (i >= N_VIA_FMTS)
+ return -EINVAL;
+ if (interval->width < QCIF_WIDTH || interval->width > VGA_WIDTH ||
+ interval->height < QCIF_HEIGHT || interval->height > VGA_HEIGHT)
+ return -EINVAL;
+ ret = sensor_call(cam, pad, enum_frame_interval, NULL, &fie);
+ if (ret)
+ return ret;
+ interval->type = V4L2_FRMIVAL_TYPE_DISCRETE;
+ interval->discrete = fie.interval;
+ return 0;
+}
+
+static const struct v4l2_ioctl_ops viacam_ioctl_ops = {
+ .vidioc_enum_input = viacam_enum_input,
+ .vidioc_g_input = viacam_g_input,
+ .vidioc_s_input = viacam_s_input,
+ .vidioc_enum_fmt_vid_cap = viacam_enum_fmt_vid_cap,
+ .vidioc_try_fmt_vid_cap = viacam_try_fmt_vid_cap,
+ .vidioc_g_fmt_vid_cap = viacam_g_fmt_vid_cap,
+ .vidioc_s_fmt_vid_cap = viacam_s_fmt_vid_cap,
+ .vidioc_querycap = viacam_querycap,
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .vidioc_create_bufs = vb2_ioctl_create_bufs,
+ .vidioc_querybuf = vb2_ioctl_querybuf,
+ .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+ .vidioc_qbuf = vb2_ioctl_qbuf,
+ .vidioc_dqbuf = vb2_ioctl_dqbuf,
+ .vidioc_expbuf = vb2_ioctl_expbuf,
+ .vidioc_streamon = vb2_ioctl_streamon,
+ .vidioc_streamoff = vb2_ioctl_streamoff,
+ .vidioc_g_parm = viacam_g_parm,
+ .vidioc_s_parm = viacam_s_parm,
+ .vidioc_enum_framesizes = viacam_enum_framesizes,
+ .vidioc_enum_frameintervals = viacam_enum_frameintervals,
+ .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
+ .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+};
+
+/*----------------------------------------------------------------------------*/
+
+/*
+ * Power management.
+ */
+#ifdef CONFIG_PM
+
+static int viacam_suspend(void *priv)
+{
+ struct via_camera *cam = priv;
+ enum viacam_opstate state = cam->opstate;
+
+ if (cam->opstate != S_IDLE) {
+ viacam_stop_engine(cam);
+ cam->opstate = state; /* So resume restarts */
+ }
+
+ return 0;
+}
+
+static int viacam_resume(void *priv)
+{
+ struct via_camera *cam = priv;
+ int ret = 0;
+
+ /*
+ * Get back to a reasonable operating state.
+ */
+ via_write_reg_mask(VIASR, 0x78, 0, 0x80);
+ via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0);
+ viacam_int_disable(cam);
+ set_bit(CF_CONFIG_NEEDED, &cam->flags);
+ /*
+ * Make sure the sensor's power state is correct
+ */
+ if (!list_empty(&cam->vdev.fh_list))
+ via_sensor_power_up(cam);
+ else
+ via_sensor_power_down(cam);
+ /*
+ * If it was operating, try to restart it.
+ */
+ if (cam->opstate != S_IDLE) {
+ mutex_lock(&cam->lock);
+ ret = viacam_configure_sensor(cam);
+ if (!ret)
+ ret = viacam_config_controller(cam);
+ mutex_unlock(&cam->lock);
+ if (!ret)
+ viacam_start_engine(cam);
+ }
+
+ return ret;
+}
+
+static struct viafb_pm_hooks viacam_pm_hooks = {
+ .suspend = viacam_suspend,
+ .resume = viacam_resume
+};
+
+#endif /* CONFIG_PM */
+
+/*
+ * Setup stuff.
+ */
+
+static const struct video_device viacam_v4l_template = {
+ .name = "via-camera",
+ .minor = -1,
+ .fops = &viacam_fops,
+ .ioctl_ops = &viacam_ioctl_ops,
+ .release = video_device_release_empty, /* Check this */
+ .device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
+ V4L2_CAP_STREAMING,
+};
+
+/*
+ * The OLPC folks put the serial port on the same pin as
+ * the camera. They also get grumpy if we break the
+ * serial port and keep them from using it. So we have
+ * to check the serial enable bit and not step on it.
+ */
+#define VIACAM_SERIAL_DEVFN 0x88
+#define VIACAM_SERIAL_CREG 0x46
+#define VIACAM_SERIAL_BIT 0x40
+
+static bool viacam_serial_is_enabled(void)
+{
+ struct pci_bus *pbus = pci_find_bus(0, 0);
+ u8 cbyte;
+
+ if (!pbus)
+ return false;
+ pci_bus_read_config_byte(pbus, VIACAM_SERIAL_DEVFN,
+ VIACAM_SERIAL_CREG, &cbyte);
+ if ((cbyte & VIACAM_SERIAL_BIT) == 0)
+ return false; /* Not enabled */
+ if (!override_serial) {
+ printk(KERN_NOTICE "Via camera: serial port is enabled, " \
+ "refusing to load.\n");
+ printk(KERN_NOTICE "Specify override_serial=1 to force " \
+ "module loading.\n");
+ return true;
+ }
+ printk(KERN_NOTICE "Via camera: overriding serial port\n");
+ pci_bus_write_config_byte(pbus, VIACAM_SERIAL_DEVFN,
+ VIACAM_SERIAL_CREG, cbyte & ~VIACAM_SERIAL_BIT);
+ return false;
+}
+
+static struct ov7670_config sensor_cfg = {
+ /* The XO-1.5 (only known user) clocks the camera at 90MHz. */
+ .clock_speed = 90,
+};
+
+static int viacam_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct i2c_adapter *sensor_adapter;
+ struct viafb_dev *viadev = pdev->dev.platform_data;
+ struct vb2_queue *vq;
+ struct i2c_board_info ov7670_info = {
+ .type = "ov7670",
+ .addr = 0x42 >> 1,
+ .platform_data = &sensor_cfg,
+ };
+
+ /*
+ * Note that there are actually two capture channels on
+ * the device. We only deal with one for now. That
+ * is encoded here; nothing else assumes it's dealing with
+ * a unique capture device.
+ */
+ struct via_camera *cam;
+
+ /*
+ * Ensure that frame buffer memory has been set aside for
+ * this purpose. As an arbitrary limit, refuse to work
+ * with less than two frames of VGA 16-bit data.
+ *
+ * If we ever support the second port, we'll need to set
+ * aside more memory.
+ */
+ if (viadev->camera_fbmem_size < (VGA_HEIGHT*VGA_WIDTH*4)) {
+ printk(KERN_ERR "viacam: insufficient FB memory reserved\n");
+ return -ENOMEM;
+ }
+ if (viadev->engine_mmio == NULL) {
+ printk(KERN_ERR "viacam: No I/O memory, so no pictures\n");
+ return -ENOMEM;
+ }
+
+ if (machine_is_olpc() && viacam_serial_is_enabled())
+ return -EBUSY;
+
+ /*
+ * Basic structure initialization.
+ */
+ cam = kzalloc (sizeof(struct via_camera), GFP_KERNEL);
+ if (cam == NULL)
+ return -ENOMEM;
+ via_cam_info = cam;
+ cam->platdev = pdev;
+ cam->viadev = viadev;
+ cam->opstate = S_IDLE;
+ cam->user_format = cam->sensor_format = viacam_def_pix_format;
+ mutex_init(&cam->lock);
+ INIT_LIST_HEAD(&cam->buffer_queue);
+ cam->mmio = viadev->engine_mmio;
+ cam->fbmem = viadev->fbmem;
+ cam->fb_offset = viadev->camera_fbmem_offset;
+ cam->flags = 1 << CF_CONFIG_NEEDED;
+ cam->mbus_code = via_def_mbus_code;
+ /*
+ * Tell V4L that we exist.
+ */
+ ret = v4l2_device_register(&pdev->dev, &cam->v4l2_dev);
+ if (ret) {
+ dev_err(&pdev->dev, "Unable to register v4l2 device\n");
+ goto out_free;
+ }
+ ret = v4l2_ctrl_handler_init(&cam->ctrl_handler, 10);
+ if (ret)
+ goto out_unregister;
+ cam->v4l2_dev.ctrl_handler = &cam->ctrl_handler;
+ /*
+ * Convince the system that we can do DMA.
+ */
+ pdev->dev.dma_mask = &viadev->pdev->dma_mask;
+ dma_set_mask(&pdev->dev, 0xffffffff);
+ /*
+ * Fire up the capture port. The write to 0x78 looks purely
+ * OLPCish; any system will need to tweak 0x1e.
+ */
+ via_write_reg_mask(VIASR, 0x78, 0, 0x80);
+ via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0);
+ /*
+ * Get the sensor powered up.
+ */
+ ret = via_sensor_power_setup(cam);
+ if (ret)
+ goto out_ctrl_hdl_free;
+ via_sensor_power_up(cam);
+
+ /*
+ * See if we can't find it on the bus. The VIA_PORT_31 assumption
+ * is OLPC-specific. 0x42 assumption is ov7670-specific.
+ */
+ sensor_adapter = viafb_find_i2c_adapter(VIA_PORT_31);
+ cam->sensor = v4l2_i2c_new_subdev_board(&cam->v4l2_dev, sensor_adapter,
+ &ov7670_info, NULL);
+ if (cam->sensor == NULL) {
+ dev_err(&pdev->dev, "Unable to find the sensor!\n");
+ ret = -ENODEV;
+ goto out_power_down;
+ }
+ /*
+ * Get the IRQ.
+ */
+ viacam_int_disable(cam);
+ ret = request_threaded_irq(viadev->pdev->irq, viacam_quick_irq,
+ viacam_irq, IRQF_SHARED, "via-camera", cam);
+ if (ret)
+ goto out_power_down;
+
+ vq = &cam->vq;
+ vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ;
+ vq->drv_priv = cam;
+ vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+ vq->buf_struct_size = sizeof(struct via_buffer);
+ vq->dev = cam->v4l2_dev.dev;
+
+ vq->ops = &viacam_vb2_ops;
+ vq->mem_ops = &vb2_dma_sg_memops;
+ vq->lock = &cam->lock;
+
+ ret = vb2_queue_init(vq);
+ /*
+ * Tell V4l2 that we exist.
+ */
+ cam->vdev = viacam_v4l_template;
+ cam->vdev.v4l2_dev = &cam->v4l2_dev;
+ cam->vdev.lock = &cam->lock;
+ cam->vdev.queue = vq;
+ video_set_drvdata(&cam->vdev, cam);
+ ret = video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1);
+ if (ret)
+ goto out_irq;
+
+#ifdef CONFIG_PM
+ /*
+ * Hook into PM events
+ */
+ viacam_pm_hooks.private = cam;
+ viafb_pm_register(&viacam_pm_hooks);
+#endif
+
+ /* Power the sensor down until somebody opens the device */
+ via_sensor_power_down(cam);
+ return 0;
+
+out_irq:
+ free_irq(viadev->pdev->irq, cam);
+out_power_down:
+ via_sensor_power_release(cam);
+out_ctrl_hdl_free:
+ v4l2_ctrl_handler_free(&cam->ctrl_handler);
+out_unregister:
+ v4l2_device_unregister(&cam->v4l2_dev);
+out_free:
+ kfree(cam);
+ return ret;
+}
+
+static int viacam_remove(struct platform_device *pdev)
+{
+ struct via_camera *cam = via_cam_info;
+ struct viafb_dev *viadev = pdev->dev.platform_data;
+
+ video_unregister_device(&cam->vdev);
+ v4l2_device_unregister(&cam->v4l2_dev);
+#ifdef CONFIG_PM
+ viafb_pm_unregister(&viacam_pm_hooks);
+#endif
+ free_irq(viadev->pdev->irq, cam);
+ via_sensor_power_release(cam);
+ v4l2_ctrl_handler_free(&cam->ctrl_handler);
+ kfree(cam);
+ via_cam_info = NULL;
+ return 0;
+}
+
+static struct platform_driver viacam_driver = {
+ .driver = {
+ .name = "viafb-camera",
+ },
+ .probe = viacam_probe,
+ .remove = viacam_remove,
+};
+
+module_platform_driver(viacam_driver);