diff options
Diffstat (limited to 'drivers/media/platform/sh_mobile_ceu_camera.c')
| -rw-r--r-- | drivers/media/platform/sh_mobile_ceu_camera.c | 2331 |
1 files changed, 2331 insertions, 0 deletions
diff --git a/drivers/media/platform/sh_mobile_ceu_camera.c b/drivers/media/platform/sh_mobile_ceu_camera.c new file mode 100644 index 000000000000..0baaf94db7e0 --- /dev/null +++ b/drivers/media/platform/sh_mobile_ceu_camera.c @@ -0,0 +1,2331 @@ +/* + * V4L2 Driver for SuperH Mobile CEU interface + * + * Copyright (C) 2008 Magnus Damm + * + * Based on V4L2 Driver for PXA camera host - "pxa_camera.c", + * + * 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 <linux/init.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/completion.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/slab.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/videodev2.h> +#include <linux/pm_runtime.h> +#include <linux/sched.h> + +#include <media/v4l2-common.h> +#include <media/v4l2-dev.h> +#include <media/soc_camera.h> +#include <media/sh_mobile_ceu.h> +#include <media/sh_mobile_csi2.h> +#include <media/videobuf2-dma-contig.h> +#include <media/v4l2-mediabus.h> +#include <media/soc_mediabus.h> + +/* register offsets for sh7722 / sh7723 */ + +#define CAPSR 0x00 /* Capture start register */ +#define CAPCR 0x04 /* Capture control register */ +#define CAMCR 0x08 /* Capture interface control register */ +#define CMCYR 0x0c /* Capture interface cycle register */ +#define CAMOR 0x10 /* Capture interface offset register */ +#define CAPWR 0x14 /* Capture interface width register */ +#define CAIFR 0x18 /* Capture interface input format register */ +#define CSTCR 0x20 /* Camera strobe control register (<= sh7722) */ +#define CSECR 0x24 /* Camera strobe emission count register (<= sh7722) */ +#define CRCNTR 0x28 /* CEU register control register */ +#define CRCMPR 0x2c /* CEU register forcible control register */ +#define CFLCR 0x30 /* Capture filter control register */ +#define CFSZR 0x34 /* Capture filter size clip register */ +#define CDWDR 0x38 /* Capture destination width register */ +#define CDAYR 0x3c /* Capture data address Y register */ +#define CDACR 0x40 /* Capture data address C register */ +#define CDBYR 0x44 /* Capture data bottom-field address Y register */ +#define CDBCR 0x48 /* Capture data bottom-field address C register */ +#define CBDSR 0x4c /* Capture bundle destination size register */ +#define CFWCR 0x5c /* Firewall operation control register */ +#define CLFCR 0x60 /* Capture low-pass filter control register */ +#define CDOCR 0x64 /* Capture data output control register */ +#define CDDCR 0x68 /* Capture data complexity level register */ +#define CDDAR 0x6c /* Capture data complexity level address register */ +#define CEIER 0x70 /* Capture event interrupt enable register */ +#define CETCR 0x74 /* Capture event flag clear register */ +#define CSTSR 0x7c /* Capture status register */ +#define CSRTR 0x80 /* Capture software reset register */ +#define CDSSR 0x84 /* Capture data size register */ +#define CDAYR2 0x90 /* Capture data address Y register 2 */ +#define CDACR2 0x94 /* Capture data address C register 2 */ +#define CDBYR2 0x98 /* Capture data bottom-field address Y register 2 */ +#define CDBCR2 0x9c /* Capture data bottom-field address C register 2 */ + +#undef DEBUG_GEOMETRY +#ifdef DEBUG_GEOMETRY +#define dev_geo dev_info +#else +#define dev_geo dev_dbg +#endif + +/* per video frame buffer */ +struct sh_mobile_ceu_buffer { + struct vb2_buffer vb; /* v4l buffer must be first */ + struct list_head queue; +}; + +struct sh_mobile_ceu_dev { + struct soc_camera_host ici; + struct soc_camera_device *icd; + struct platform_device *csi2_pdev; + + unsigned int irq; + void __iomem *base; + size_t video_limit; + size_t buf_total; + + spinlock_t lock; /* Protects video buffer lists */ + struct list_head capture; + struct vb2_buffer *active; + struct vb2_alloc_ctx *alloc_ctx; + + struct sh_mobile_ceu_info *pdata; + struct completion complete; + + u32 cflcr; + + /* static max sizes either from platform data or default */ + int max_width; + int max_height; + + enum v4l2_field field; + int sequence; + + unsigned int image_mode:1; + unsigned int is_16bit:1; + unsigned int frozen:1; +}; + +struct sh_mobile_ceu_cam { + /* CEU offsets within the camera output, before the CEU scaler */ + unsigned int ceu_left; + unsigned int ceu_top; + /* Client output, as seen by the CEU */ + unsigned int width; + unsigned int height; + /* + * User window from S_CROP / G_CROP, produced by client cropping and + * scaling, CEU scaling and CEU cropping, mapped back onto the client + * input window + */ + struct v4l2_rect subrect; + /* Camera cropping rectangle */ + struct v4l2_rect rect; + const struct soc_mbus_pixelfmt *extra_fmt; + enum v4l2_mbus_pixelcode code; +}; + +static struct sh_mobile_ceu_buffer *to_ceu_vb(struct vb2_buffer *vb) +{ + return container_of(vb, struct sh_mobile_ceu_buffer, vb); +} + +static void ceu_write(struct sh_mobile_ceu_dev *priv, + unsigned long reg_offs, u32 data) +{ + iowrite32(data, priv->base + reg_offs); +} + +static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs) +{ + return ioread32(priv->base + reg_offs); +} + +static int sh_mobile_ceu_soft_reset(struct sh_mobile_ceu_dev *pcdev) +{ + int i, success = 0; + struct soc_camera_device *icd = pcdev->icd; + + ceu_write(pcdev, CAPSR, 1 << 16); /* reset */ + + /* wait CSTSR.CPTON bit */ + for (i = 0; i < 1000; i++) { + if (!(ceu_read(pcdev, CSTSR) & 1)) { + success++; + break; + } + udelay(1); + } + + /* wait CAPSR.CPKIL bit */ + for (i = 0; i < 1000; i++) { + if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) { + success++; + break; + } + udelay(1); + } + + + if (2 != success) { + dev_warn(icd->pdev, "soft reset time out\n"); + return -EIO; + } + + return 0; +} + +/* + * Videobuf operations + */ + +/* + * .queue_setup() is called to check, whether the driver can accept the + * requested number of buffers and to fill in plane sizes + * for the current frame format if required + */ +static int sh_mobile_ceu_videobuf_setup(struct vb2_queue *vq, + const struct v4l2_format *fmt, + unsigned int *count, unsigned int *num_planes, + unsigned int sizes[], void *alloc_ctxs[]) +{ + struct soc_camera_device *icd = container_of(vq, struct soc_camera_device, vb2_vidq); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + + if (fmt) { + const struct soc_camera_format_xlate *xlate = soc_camera_xlate_by_fourcc(icd, + fmt->fmt.pix.pixelformat); + unsigned int bytes_per_line; + int ret; + + if (!xlate) + return -EINVAL; + + ret = soc_mbus_bytes_per_line(fmt->fmt.pix.width, + xlate->host_fmt); + if (ret < 0) + return ret; + + bytes_per_line = max_t(u32, fmt->fmt.pix.bytesperline, ret); + + ret = soc_mbus_image_size(xlate->host_fmt, bytes_per_line, + fmt->fmt.pix.height); + if (ret < 0) + return ret; + + sizes[0] = max_t(u32, fmt->fmt.pix.sizeimage, ret); + } else { + /* Called from VIDIOC_REQBUFS or in compatibility mode */ + sizes[0] = icd->sizeimage; + } + + alloc_ctxs[0] = pcdev->alloc_ctx; + + if (!vq->num_buffers) + pcdev->sequence = 0; + + if (!*count) + *count = 2; + + /* If *num_planes != 0, we have already verified *count. */ + if (pcdev->video_limit && !*num_planes) { + size_t size = PAGE_ALIGN(sizes[0]) * *count; + + if (size + pcdev->buf_total > pcdev->video_limit) + *count = (pcdev->video_limit - pcdev->buf_total) / + PAGE_ALIGN(sizes[0]); + } + + *num_planes = 1; + + dev_dbg(icd->parent, "count=%d, size=%u\n", *count, sizes[0]); + + return 0; +} + +#define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */ +#define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */ +#define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */ +#define CEU_CEIER_VBP (1 << 20) /* vbp error */ +#define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */ +#define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP) + + +/* + * return value doesn't reflex the success/failure to queue the new buffer, + * but rather the status of the previous buffer. + */ +static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev) +{ + struct soc_camera_device *icd = pcdev->icd; + dma_addr_t phys_addr_top, phys_addr_bottom; + unsigned long top1, top2; + unsigned long bottom1, bottom2; + u32 status; + bool planar; + int ret = 0; + + /* + * The hardware is _very_ picky about this sequence. Especially + * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge + * several not-so-well documented interrupt sources in CETCR. + */ + ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK); + status = ceu_read(pcdev, CETCR); + ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC); + if (!pcdev->frozen) + ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK); + ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP); + ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW); + + /* + * When a VBP interrupt occurs, a capture end interrupt does not occur + * and the image of that frame is not captured correctly. So, soft reset + * is needed here. + */ + if (status & CEU_CEIER_VBP) { + sh_mobile_ceu_soft_reset(pcdev); + ret = -EIO; + } + + if (pcdev->frozen) { + complete(&pcdev->complete); + return ret; + } + + if (!pcdev->active) + return ret; + + if (V4L2_FIELD_INTERLACED_BT == pcdev->field) { + top1 = CDBYR; + top2 = CDBCR; + bottom1 = CDAYR; + bottom2 = CDACR; + } else { + top1 = CDAYR; + top2 = CDACR; + bottom1 = CDBYR; + bottom2 = CDBCR; + } + + phys_addr_top = vb2_dma_contig_plane_dma_addr(pcdev->active, 0); + + switch (icd->current_fmt->host_fmt->fourcc) { + case V4L2_PIX_FMT_NV12: + case V4L2_PIX_FMT_NV21: + case V4L2_PIX_FMT_NV16: + case V4L2_PIX_FMT_NV61: + planar = true; + break; + default: + planar = false; + } + + ceu_write(pcdev, top1, phys_addr_top); + if (V4L2_FIELD_NONE != pcdev->field) { + phys_addr_bottom = phys_addr_top + icd->bytesperline; + ceu_write(pcdev, bottom1, phys_addr_bottom); + } + + if (planar) { + phys_addr_top += icd->bytesperline * icd->user_height; + ceu_write(pcdev, top2, phys_addr_top); + if (V4L2_FIELD_NONE != pcdev->field) { + phys_addr_bottom = phys_addr_top + icd->bytesperline; + ceu_write(pcdev, bottom2, phys_addr_bottom); + } + } + + ceu_write(pcdev, CAPSR, 0x1); /* start capture */ + + return ret; +} + +static int sh_mobile_ceu_videobuf_prepare(struct vb2_buffer *vb) +{ + struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb); + + /* Added list head initialization on alloc */ + WARN(!list_empty(&buf->queue), "Buffer %p on queue!\n", vb); + + return 0; +} + +static void sh_mobile_ceu_videobuf_queue(struct vb2_buffer *vb) +{ + struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb); + unsigned long size; + + size = icd->sizeimage; + + if (vb2_plane_size(vb, 0) < size) { + dev_err(icd->parent, "Buffer #%d too small (%lu < %lu)\n", + vb->v4l2_buf.index, vb2_plane_size(vb, 0), size); + goto error; + } + + vb2_set_plane_payload(vb, 0, size); + + dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__, + vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0)); + +#ifdef DEBUG + /* + * This can be useful if you want to see if we actually fill + * the buffer with something + */ + if (vb2_plane_vaddr(vb, 0)) + memset(vb2_plane_vaddr(vb, 0), 0xaa, vb2_get_plane_payload(vb, 0)); +#endif + + spin_lock_irq(&pcdev->lock); + list_add_tail(&buf->queue, &pcdev->capture); + + if (!pcdev->active) { + /* + * Because there were no active buffer at this moment, + * we are not interested in the return value of + * sh_mobile_ceu_capture here. + */ + pcdev->active = vb; + sh_mobile_ceu_capture(pcdev); + } + spin_unlock_irq(&pcdev->lock); + + return; + +error: + vb2_buffer_done(vb, VB2_BUF_STATE_ERROR); +} + +static void sh_mobile_ceu_videobuf_release(struct vb2_buffer *vb) +{ + struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + + spin_lock_irq(&pcdev->lock); + + if (pcdev->active == vb) { + /* disable capture (release DMA buffer), reset */ + ceu_write(pcdev, CAPSR, 1 << 16); + pcdev->active = NULL; + } + + /* + * Doesn't hurt also if the list is empty, but it hurts, if queuing the + * buffer failed, and .buf_init() hasn't been called + */ + if (buf->queue.next) + list_del_init(&buf->queue); + + pcdev->buf_total -= PAGE_ALIGN(vb2_plane_size(vb, 0)); + dev_dbg(icd->parent, "%s() %zu bytes buffers\n", __func__, + pcdev->buf_total); + + spin_unlock_irq(&pcdev->lock); +} + +static int sh_mobile_ceu_videobuf_init(struct vb2_buffer *vb) +{ + struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + + pcdev->buf_total += PAGE_ALIGN(vb2_plane_size(vb, 0)); + dev_dbg(icd->parent, "%s() %zu bytes buffers\n", __func__, + pcdev->buf_total); + + /* This is for locking debugging only */ + INIT_LIST_HEAD(&to_ceu_vb(vb)->queue); + return 0; +} + +static int sh_mobile_ceu_stop_streaming(struct vb2_queue *q) +{ + struct soc_camera_device *icd = container_of(q, struct soc_camera_device, vb2_vidq); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + struct list_head *buf_head, *tmp; + + spin_lock_irq(&pcdev->lock); + + pcdev->active = NULL; + + list_for_each_safe(buf_head, tmp, &pcdev->capture) + list_del_init(buf_head); + + spin_unlock_irq(&pcdev->lock); + + return sh_mobile_ceu_soft_reset(pcdev); +} + +static struct vb2_ops sh_mobile_ceu_videobuf_ops = { + .queue_setup = sh_mobile_ceu_videobuf_setup, + .buf_prepare = sh_mobile_ceu_videobuf_prepare, + .buf_queue = sh_mobile_ceu_videobuf_queue, + .buf_cleanup = sh_mobile_ceu_videobuf_release, + .buf_init = sh_mobile_ceu_videobuf_init, + .wait_prepare = soc_camera_unlock, + .wait_finish = soc_camera_lock, + .stop_streaming = sh_mobile_ceu_stop_streaming, +}; + +static irqreturn_t sh_mobile_ceu_irq(int irq, void *data) +{ + struct sh_mobile_ceu_dev *pcdev = data; + struct vb2_buffer *vb; + int ret; + + spin_lock(&pcdev->lock); + + vb = pcdev->active; + if (!vb) + /* Stale interrupt from a released buffer */ + goto out; + + list_del_init(&to_ceu_vb(vb)->queue); + + if (!list_empty(&pcdev->capture)) + pcdev->active = &list_entry(pcdev->capture.next, + struct sh_mobile_ceu_buffer, queue)->vb; + else + pcdev->active = NULL; + + ret = sh_mobile_ceu_capture(pcdev); + do_gettimeofday(&vb->v4l2_buf.timestamp); + if (!ret) { + vb->v4l2_buf.field = pcdev->field; + vb->v4l2_buf.sequence = pcdev->sequence++; + } + vb2_buffer_done(vb, ret < 0 ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE); + +out: + spin_unlock(&pcdev->lock); + + return IRQ_HANDLED; +} + +static struct v4l2_subdev *find_csi2(struct sh_mobile_ceu_dev *pcdev) +{ + struct v4l2_subdev *sd; + + if (!pcdev->csi2_pdev) + return NULL; + + v4l2_device_for_each_subdev(sd, &pcdev->ici.v4l2_dev) + if (&pcdev->csi2_pdev->dev == v4l2_get_subdevdata(sd)) + return sd; + + return NULL; +} + +/* Called with .video_lock held */ +static int sh_mobile_ceu_add_device(struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + struct v4l2_subdev *csi2_sd; + int ret; + + if (pcdev->icd) + return -EBUSY; + + dev_info(icd->parent, + "SuperH Mobile CEU driver attached to camera %d\n", + icd->devnum); + + pm_runtime_get_sync(ici->v4l2_dev.dev); + + pcdev->buf_total = 0; + + ret = sh_mobile_ceu_soft_reset(pcdev); + + csi2_sd = find_csi2(pcdev); + if (csi2_sd) { + csi2_sd->grp_id = soc_camera_grp_id(icd); + v4l2_set_subdev_hostdata(csi2_sd, icd); + } + + ret = v4l2_subdev_call(csi2_sd, core, s_power, 1); + if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV) { + pm_runtime_put_sync(ici->v4l2_dev.dev); + return ret; + } + + /* + * -ENODEV is special: either csi2_sd == NULL or the CSI-2 driver + * has not found this soc-camera device among its clients + */ + if (ret == -ENODEV && csi2_sd) + csi2_sd->grp_id = 0; + pcdev->icd = icd; + + return 0; +} + +/* Called with .video_lock held */ +static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + struct v4l2_subdev *csi2_sd = find_csi2(pcdev); + + BUG_ON(icd != pcdev->icd); + + v4l2_subdev_call(csi2_sd, core, s_power, 0); + if (csi2_sd) + csi2_sd->grp_id = 0; + /* disable capture, disable interrupts */ + ceu_write(pcdev, CEIER, 0); + sh_mobile_ceu_soft_reset(pcdev); + + /* make sure active buffer is canceled */ + spin_lock_irq(&pcdev->lock); + if (pcdev->active) { + list_del_init(&to_ceu_vb(pcdev->active)->queue); + vb2_buffer_done(pcdev->active, VB2_BUF_STATE_ERROR); + pcdev->active = NULL; + } + spin_unlock_irq(&pcdev->lock); + + pm_runtime_put_sync(ici->v4l2_dev.dev); + + dev_info(icd->parent, + "SuperH Mobile CEU driver detached from camera %d\n", + icd->devnum); + + pcdev->icd = NULL; +} + +/* + * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)" + * in SH7722 Hardware Manual + */ +static unsigned int size_dst(unsigned int src, unsigned int scale) +{ + unsigned int mant_pre = scale >> 12; + if (!src || !scale) + return src; + return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) * + mant_pre * 4096 / scale + 1; +} + +static u16 calc_scale(unsigned int src, unsigned int *dst) +{ + u16 scale; + + if (src == *dst) + return 0; + + scale = (src * 4096 / *dst) & ~7; + + while (scale > 4096 && size_dst(src, scale) < *dst) + scale -= 8; + + *dst = size_dst(src, scale); + + return scale; +} + +/* rect is guaranteed to not exceed the scaled camera rectangle */ +static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct sh_mobile_ceu_cam *cam = icd->host_priv; + struct sh_mobile_ceu_dev *pcdev = ici->priv; + unsigned int height, width, cdwdr_width, in_width, in_height; + unsigned int left_offset, top_offset; + u32 camor; + + dev_geo(icd->parent, "Crop %ux%u@%u:%u\n", + icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top); + + left_offset = cam->ceu_left; + top_offset = cam->ceu_top; + + WARN_ON(icd->user_width & 3 || icd->user_height & 3); + + width = icd->user_width; + + if (pcdev->image_mode) { + in_width = cam->width; + if (!pcdev->is_16bit) { + in_width *= 2; + left_offset *= 2; + } + } else { + unsigned int w_factor; + + switch (icd->current_fmt->host_fmt->packing) { + case SOC_MBUS_PACKING_2X8_PADHI: + w_factor = 2; + break; + default: + w_factor = 1; + } + + in_width = cam->width * w_factor; + left_offset *= w_factor; + } + + cdwdr_width = icd->bytesperline; + + height = icd->user_height; + in_height = cam->height; + if (V4L2_FIELD_NONE != pcdev->field) { + height = (height / 2) & ~3; + in_height /= 2; + top_offset /= 2; + cdwdr_width *= 2; + } + + /* CSI2 special configuration */ + if (pcdev->pdata->csi2) { + in_width = ((in_width - 2) * 2); + left_offset *= 2; + } + + /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */ + camor = left_offset | (top_offset << 16); + + dev_geo(icd->parent, + "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor, + (in_height << 16) | in_width, (height << 16) | width, + cdwdr_width); + + ceu_write(pcdev, CAMOR, camor); + ceu_write(pcdev, CAPWR, (in_height << 16) | in_width); + /* CFSZR clipping is applied _after_ the scaling filter (CFLCR) */ + ceu_write(pcdev, CFSZR, (height << 16) | width); + ceu_write(pcdev, CDWDR, cdwdr_width); +} + +static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev) +{ + u32 capsr = ceu_read(pcdev, CAPSR); + ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */ + return capsr; +} + +static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr) +{ + unsigned long timeout = jiffies + 10 * HZ; + + /* + * Wait until the end of the current frame. It can take a long time, + * but if it has been aborted by a CAPSR reset, it shoule exit sooner. + */ + while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout)) + msleep(1); + + if (time_after(jiffies, timeout)) { + dev_err(pcdev->ici.v4l2_dev.dev, + "Timeout waiting for frame end! Interface problem?\n"); + return; + } + + /* Wait until reset clears, this shall not hang... */ + while (ceu_read(pcdev, CAPSR) & (1 << 16)) + udelay(10); + + /* Anything to restore? */ + if (capsr & ~(1 << 16)) + ceu_write(pcdev, CAPSR, capsr); +} + +/* Find the bus subdevice driver, e.g., CSI2 */ +static struct v4l2_subdev *find_bus_subdev(struct sh_mobile_ceu_dev *pcdev, + struct soc_camera_device *icd) +{ + if (pcdev->csi2_pdev) { + struct v4l2_subdev *csi2_sd = find_csi2(pcdev); + if (csi2_sd && csi2_sd->grp_id == soc_camera_grp_id(icd)) + return csi2_sd; + } + + return soc_camera_to_subdev(icd); +} + +#define CEU_BUS_FLAGS (V4L2_MBUS_MASTER | \ + V4L2_MBUS_PCLK_SAMPLE_RISING | \ + V4L2_MBUS_HSYNC_ACTIVE_HIGH | \ + V4L2_MBUS_HSYNC_ACTIVE_LOW | \ + V4L2_MBUS_VSYNC_ACTIVE_HIGH | \ + V4L2_MBUS_VSYNC_ACTIVE_LOW | \ + V4L2_MBUS_DATA_ACTIVE_HIGH) + +/* Capture is not running, no interrupts, no locking needed */ +static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd); + struct sh_mobile_ceu_cam *cam = icd->host_priv; + struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,}; + unsigned long value, common_flags = CEU_BUS_FLAGS; + u32 capsr = capture_save_reset(pcdev); + unsigned int yuv_lineskip; + int ret; + + /* + * If the client doesn't implement g_mbus_config, we just use our + * platform data + */ + ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg); + if (!ret) { + common_flags = soc_mbus_config_compatible(&cfg, + common_flags); + if (!common_flags) + return -EINVAL; + } else if (ret != -ENOIOCTLCMD) { + return ret; + } + + /* Make choises, based on platform preferences */ + if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) && + (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) { + if (pcdev->pdata->flags & SH_CEU_FLAG_HSYNC_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 (pcdev->pdata->flags & SH_CEU_FLAG_VSYNC_LOW) + common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH; + else + common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW; + } + + cfg.flags = common_flags; + ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg); + if (ret < 0 && ret != -ENOIOCTLCMD) + return ret; + + if (icd->current_fmt->host_fmt->bits_per_sample > 8) + pcdev->is_16bit = 1; + else + pcdev->is_16bit = 0; + + ceu_write(pcdev, CRCNTR, 0); + ceu_write(pcdev, CRCMPR, 0); + + value = 0x00000010; /* data fetch by default */ + yuv_lineskip = 0x10; + + switch (icd->current_fmt->host_fmt->fourcc) { + case V4L2_PIX_FMT_NV12: + case V4L2_PIX_FMT_NV21: + /* convert 4:2:2 -> 4:2:0 */ + yuv_lineskip = 0; /* skip for NV12/21, no skip for NV16/61 */ + /* fall-through */ + case V4L2_PIX_FMT_NV16: + case V4L2_PIX_FMT_NV61: + switch (cam->code) { + case V4L2_MBUS_FMT_UYVY8_2X8: + value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */ + break; + case V4L2_MBUS_FMT_VYUY8_2X8: + value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */ + break; + case V4L2_MBUS_FMT_YUYV8_2X8: + value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */ + break; + case V4L2_MBUS_FMT_YVYU8_2X8: + value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */ + break; + default: + BUG(); + } + } + + if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 || + icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61) + value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */ + + value |= common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW ? 1 << 1 : 0; + value |= common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW ? 1 << 0 : 0; + + if (pcdev->pdata->csi2) /* CSI2 mode */ + value |= 3 << 12; + else if (pcdev->is_16bit) + value |= 1 << 12; + else if (pcdev->pdata->flags & SH_CEU_FLAG_LOWER_8BIT) + value |= 2 << 12; + + ceu_write(pcdev, CAMCR, value); + + ceu_write(pcdev, CAPCR, 0x00300000); + + switch (pcdev->field) { + case V4L2_FIELD_INTERLACED_TB: + value = 0x101; + break; + case V4L2_FIELD_INTERLACED_BT: + value = 0x102; + break; + default: + value = 0; + break; + } + ceu_write(pcdev, CAIFR, value); + + sh_mobile_ceu_set_rect(icd); + mdelay(1); + + dev_geo(icd->parent, "CFLCR 0x%x\n", pcdev->cflcr); + ceu_write(pcdev, CFLCR, pcdev->cflcr); + + /* + * A few words about byte order (observed in Big Endian mode) + * + * In data fetch mode bytes are received in chunks of 8 bytes. + * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first) + * + * The data is however by default written to memory in reverse order: + * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte) + * + * The lowest three bits of CDOCR allows us to do swapping, + * using 7 we swap the data bytes to match the incoming order: + * D0, D1, D2, D3, D4, D5, D6, D7 + */ + value = 0x00000007 | yuv_lineskip; + + ceu_write(pcdev, CDOCR, value); + ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */ + + capture_restore(pcdev, capsr); + + /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */ + return 0; +} + +static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd, + unsigned char buswidth) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd); + unsigned long common_flags = CEU_BUS_FLAGS; + struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,}; + int ret; + + ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg); + if (!ret) + common_flags = soc_mbus_config_compatible(&cfg, + common_flags); + else if (ret != -ENOIOCTLCMD) + return ret; + + if (!common_flags || buswidth > 16) + return -EINVAL; + + return 0; +} + +static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = { + { + .fourcc = V4L2_PIX_FMT_NV12, + .name = "NV12", + .bits_per_sample = 8, + .packing = SOC_MBUS_PACKING_1_5X8, + .order = SOC_MBUS_ORDER_LE, + .layout = SOC_MBUS_LAYOUT_PLANAR_2Y_C, + }, { + .fourcc = V4L2_PIX_FMT_NV21, + .name = "NV21", + .bits_per_sample = 8, + .packing = SOC_MBUS_PACKING_1_5X8, + .order = SOC_MBUS_ORDER_LE, + .layout = SOC_MBUS_LAYOUT_PLANAR_2Y_C, + }, { + .fourcc = V4L2_PIX_FMT_NV16, + .name = "NV16", + .bits_per_sample = 8, + .packing = SOC_MBUS_PACKING_2X8_PADHI, + .order = SOC_MBUS_ORDER_LE, + .layout = SOC_MBUS_LAYOUT_PLANAR_Y_C, + }, { + .fourcc = V4L2_PIX_FMT_NV61, + .name = "NV61", + .bits_per_sample = 8, + .packing = SOC_MBUS_PACKING_2X8_PADHI, + .order = SOC_MBUS_ORDER_LE, + .layout = SOC_MBUS_LAYOUT_PLANAR_Y_C, + }, +}; + +/* This will be corrected as we get more formats */ +static bool sh_mobile_ceu_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_1_5X8) || + (fmt->bits_per_sample == 8 && + fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) || + (fmt->bits_per_sample > 8 && + fmt->packing == SOC_MBUS_PACKING_EXTEND16); +} + +static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect); + +static struct soc_camera_device *ctrl_to_icd(struct v4l2_ctrl *ctrl) +{ + return container_of(ctrl->handler, struct soc_camera_device, + ctrl_handler); +} + +static int sh_mobile_ceu_s_ctrl(struct v4l2_ctrl *ctrl) +{ + struct soc_camera_device *icd = ctrl_to_icd(ctrl); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + + switch (ctrl->id) { + case V4L2_CID_SHARPNESS: + switch (icd->current_fmt->host_fmt->fourcc) { + case V4L2_PIX_FMT_NV12: + case V4L2_PIX_FMT_NV21: + case V4L2_PIX_FMT_NV16: + case V4L2_PIX_FMT_NV61: + ceu_write(pcdev, CLFCR, !ctrl->val); + return 0; + } + break; + } + + return -EINVAL; +} + +static const struct v4l2_ctrl_ops sh_mobile_ceu_ctrl_ops = { + .s_ctrl = sh_mobile_ceu_s_ctrl, +}; + +static int sh_mobile_ceu_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); + struct device *dev = icd->parent; + struct soc_camera_host *ici = to_soc_camera_host(dev); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + int ret, k, n; + int formats = 0; + struct sh_mobile_ceu_cam *cam; + enum v4l2_mbus_pixelcode code; + 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_warn(dev, "unsupported format code #%u: %d\n", idx, code); + return 0; + } + + if (!pcdev->pdata->csi2) { + /* Are there any restrictions in the CSI-2 case? */ + ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample); + if (ret < 0) + return 0; + } + + if (!icd->host_priv) { + struct v4l2_mbus_framefmt mf; + struct v4l2_rect rect; + int shift = 0; + + /* Add our control */ + v4l2_ctrl_new_std(&icd->ctrl_handler, &sh_mobile_ceu_ctrl_ops, + V4L2_CID_SHARPNESS, 0, 1, 1, 0); + if (icd->ctrl_handler.error) + return icd->ctrl_handler.error; + + /* FIXME: subwindow is lost between close / open */ + + /* Cache current client geometry */ + ret = client_g_rect(sd, &rect); + if (ret < 0) + return ret; + + /* First time */ + ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf); + if (ret < 0) + return ret; + + /* + * All currently existing CEU implementations support 2560x1920 + * or larger frames. If the sensor is proposing too big a frame, + * don't bother with possibly supportred by the CEU larger + * sizes, just try VGA multiples. If needed, this can be + * adjusted in the future. + */ + while ((mf.width > pcdev->max_width || + mf.height > pcdev->max_height) && shift < 4) { + /* Try 2560x1920, 1280x960, 640x480, 320x240 */ + mf.width = 2560 >> shift; + mf.height = 1920 >> shift; + ret = v4l2_device_call_until_err(sd->v4l2_dev, + soc_camera_grp_id(icd), video, + s_mbus_fmt, &mf); + if (ret < 0) + return ret; + shift++; + } + + if (shift == 4) { + dev_err(dev, "Failed to configure the client below %ux%x\n", + mf.width, mf.height); + return -EIO; + } + + dev_geo(dev, "camera fmt %ux%u\n", mf.width, mf.height); + + cam = kzalloc(sizeof(*cam), GFP_KERNEL); + if (!cam) + return -ENOMEM; + + /* We are called with current camera crop, initialise subrect with it */ + cam->rect = rect; + cam->subrect = rect; + + cam->width = mf.width; + cam->height = mf.height; + + icd->host_priv = cam; + } else { + cam = icd->host_priv; + } + + /* Beginning of a pass */ + if (!idx) + cam->extra_fmt = NULL; + + 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: + if (cam->extra_fmt) + break; + + /* + * Our case is simple so far: for any of the above four camera + * formats we add all our four synthesized NV* formats, so, + * just marking the device with a single flag suffices. If + * the format generation rules are more complex, you would have + * to actually hang your already added / counted formats onto + * the host_priv pointer and check whether the format you're + * going to add now is already there. + */ + cam->extra_fmt = sh_mobile_ceu_formats; + + n = ARRAY_SIZE(sh_mobile_ceu_formats); + formats += n; + for (k = 0; xlate && k < n; k++) { + xlate->host_fmt = &sh_mobile_ceu_formats[k]; + xlate->code = code; + xlate++; + dev_dbg(dev, "Providing format %s using code %d\n", + sh_mobile_ceu_formats[k].name, code); + } + break; + default: + if (!sh_mobile_ceu_packing_supported(fmt)) + return 0; + } + + /* Generic pass-through */ + formats++; + if (xlate) { + xlate->host_fmt = fmt; + xlate->code = code; + xlate++; + dev_dbg(dev, "Providing format %s in pass-through mode\n", + fmt->name); + } + + return formats; +} + +static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd) +{ + kfree(icd->host_priv); + icd->host_priv = NULL; +} + +/* Check if any dimension of r1 is smaller than respective one of r2 */ +static bool is_smaller(struct v4l2_rect *r1, struct v4l2_rect *r2) +{ + return r1->width < r2->width || r1->height < r2->height; +} + +/* Check if r1 fails to cover r2 */ +static bool is_inside(struct v4l2_rect *r1, struct v4l2_rect *r2) +{ + return r1->left > r2->left || r1->top > r2->top || + r1->left + r1->width < r2->left + r2->width || + r1->top + r1->height < r2->top + r2->height; +} + +static unsigned int scale_down(unsigned int size, unsigned int scale) +{ + return (size * 4096 + scale / 2) / scale; +} + +static unsigned int calc_generic_scale(unsigned int input, unsigned int output) +{ + return (input * 4096 + output / 2) / output; +} + +/* Get and store current client crop */ +static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect) +{ + struct v4l2_crop crop; + struct v4l2_cropcap cap; + int ret; + + crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + + ret = v4l2_subdev_call(sd, video, g_crop, &crop); + if (!ret) { + *rect = crop.c; + return ret; + } + + /* Camera driver doesn't support .g_crop(), assume default rectangle */ + cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + + ret = v4l2_subdev_call(sd, video, cropcap, &cap); + if (!ret) + *rect = cap.defrect; + + return ret; +} + +/* Client crop has changed, update our sub-rectangle to remain within the area */ +static void update_subrect(struct sh_mobile_ceu_cam *cam) +{ + struct v4l2_rect *rect = &cam->rect, *subrect = &cam->subrect; + + if (rect->width < subrect->width) + subrect->width = rect->width; + + if (rect->height < subrect->height) + subrect->height = rect->height; + + if (rect->left > subrect->left) + subrect->left = rect->left; + else if (rect->left + rect->width > + subrect->left + subrect->width) + subrect->left = rect->left + rect->width - + subrect->width; + + if (rect->top > subrect->top) + subrect->top = rect->top; + else if (rect->top + rect->height > + subrect->top + subrect->height) + subrect->top = rect->top + rect->height - + subrect->height; +} + +/* + * The common for both scaling and cropping iterative approach is: + * 1. try if the client can produce exactly what requested by the user + * 2. if (1) failed, try to double the client image until we get one big enough + * 3. if (2) failed, try to request the maximum image + */ +static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop, + struct v4l2_crop *cam_crop) +{ + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c; + struct device *dev = sd->v4l2_dev->dev; + struct sh_mobile_ceu_cam *cam = icd->host_priv; + struct v4l2_cropcap cap; + int ret; + unsigned int width, height; + + v4l2_subdev_call(sd, video, s_crop, crop); + ret = client_g_rect(sd, cam_rect); + if (ret < 0) + return ret; + + /* + * Now cam_crop contains the current camera input rectangle, and it must + * be within camera cropcap bounds + */ + if (!memcmp(rect, cam_rect, sizeof(*rect))) { + /* Even if camera S_CROP failed, but camera rectangle matches */ + dev_dbg(dev, "Camera S_CROP successful for %dx%d@%d:%d\n", + rect->width, rect->height, rect->left, rect->top); + cam->rect = *cam_rect; + return 0; + } + + /* Try to fix cropping, that camera hasn't managed to set */ + dev_geo(dev, "Fix camera S_CROP for %dx%d@%d:%d to %dx%d@%d:%d\n", + cam_rect->width, cam_rect->height, + cam_rect->left, cam_rect->top, + rect->width, rect->height, rect->left, rect->top); + + /* We need sensor maximum rectangle */ + ret = v4l2_subdev_call(sd, video, cropcap, &cap); + if (ret < 0) + return ret; + + /* Put user requested rectangle within sensor bounds */ + soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2, + cap.bounds.width); + soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4, + cap.bounds.height); + + /* + * Popular special case - some cameras can only handle fixed sizes like + * QVGA, VGA,... Take care to avoid infinite loop. + */ + width = max(cam_rect->width, 2); + height = max(cam_rect->height, 2); + + /* + * Loop as long as sensor is not covering the requested rectangle and + * is still within its bounds + */ + while (!ret && (is_smaller(cam_rect, rect) || + is_inside(cam_rect, rect)) && + (cap.bounds.width > width || cap.bounds.height > height)) { + + width *= 2; + height *= 2; + + cam_rect->width = width; + cam_rect->height = height; + + /* + * We do not know what capabilities the camera has to set up + * left and top borders. We could try to be smarter in iterating + * them, e.g., if camera current left is to the right of the + * target left, set it to the middle point between the current + * left and minimum left. But that would add too much + * complexity: we would have to iterate each border separately. + * Instead we just drop to the left and top bounds. + */ + if (cam_rect->left > rect->left) + cam_rect->left = cap.bounds.left; + + if (cam_rect->left + cam_rect->width < rect->left + rect->width) + cam_rect->width = rect->left + rect->width - + cam_rect->left; + + if (cam_rect->top > rect->top) + cam_rect->top = cap.bounds.top; + + if (cam_rect->top + cam_rect->height < rect->top + rect->height) + cam_rect->height = rect->top + rect->height - + cam_rect->top; + + v4l2_subdev_call(sd, video, s_crop, cam_crop); + ret = client_g_rect(sd, cam_rect); + dev_geo(dev, "Camera S_CROP %d for %dx%d@%d:%d\n", ret, + cam_rect->width, cam_rect->height, + cam_rect->left, cam_rect->top); + } + + /* S_CROP must not modify the rectangle */ + if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) { + /* + * The camera failed to configure a suitable cropping, + * we cannot use the current rectangle, set to max + */ + *cam_rect = cap.bounds; + v4l2_subdev_call(sd, video, s_crop, cam_crop); + ret = client_g_rect(sd, cam_rect); + dev_geo(dev, "Camera S_CROP %d for max %dx%d@%d:%d\n", ret, + cam_rect->width, cam_rect->height, + cam_rect->left, cam_rect->top); + } + + if (!ret) { + cam->rect = *cam_rect; + update_subrect(cam); + } + + return ret; +} + +/* Iterative s_mbus_fmt, also updates cached client crop on success */ +static int client_s_fmt(struct soc_camera_device *icd, + struct v4l2_mbus_framefmt *mf, bool ceu_can_scale) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + struct sh_mobile_ceu_cam *cam = icd->host_priv; + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + struct device *dev = icd->parent; + unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h; + unsigned int max_width, max_height; + struct v4l2_cropcap cap; + bool ceu_1to1; + int ret; + + ret = v4l2_device_call_until_err(sd->v4l2_dev, + soc_camera_grp_id(icd), video, + s_mbus_fmt, mf); + if (ret < 0) + return ret; + + dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height); + + if (width == mf->width && height == mf->height) { + /* Perfect! The client has done it all. */ + ceu_1to1 = true; + goto update_cache; + } + + ceu_1to1 = false; + if (!ceu_can_scale) + goto update_cache; + + cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + + ret = v4l2_subdev_call(sd, video, cropcap, &cap); + if (ret < 0) + return ret; + + max_width = min(cap.bounds.width, pcdev->max_width); + max_height = min(cap.bounds.height, pcdev->max_height); + + /* Camera set a format, but geometry is not precise, try to improve */ + tmp_w = mf->width; + tmp_h = mf->height; + + /* width <= max_width && height <= max_height - guaranteed by try_fmt */ + while ((width > tmp_w || height > tmp_h) && + tmp_w < max_width && tmp_h < max_height) { + tmp_w = min(2 * tmp_w, max_width); + tmp_h = min(2 * tmp_h, max_height); + mf->width = tmp_w; + mf->height = tmp_h; + ret = v4l2_device_call_until_err(sd->v4l2_dev, + soc_camera_grp_id(icd), video, + s_mbus_fmt, mf); + dev_geo(dev, "Camera scaled to %ux%u\n", + mf->width, mf->height); + if (ret < 0) { + /* This shouldn't happen */ + dev_err(dev, "Client failed to set format: %d\n", ret); + return ret; + } + } + +update_cache: + /* Update cache */ + ret = client_g_rect(sd, &cam->rect); + if (ret < 0) + return ret; + + if (ceu_1to1) + cam->subrect = cam->rect; + else + update_subrect(cam); + + return 0; +} + +/** + * @width - on output: user width, mapped back to input + * @height - on output: user height, mapped back to input + * @mf - in- / output camera output window + */ +static int client_scale(struct soc_camera_device *icd, + struct v4l2_mbus_framefmt *mf, + unsigned int *width, unsigned int *height, + bool ceu_can_scale) +{ + struct sh_mobile_ceu_cam *cam = icd->host_priv; + struct device *dev = icd->parent; + struct v4l2_mbus_framefmt mf_tmp = *mf; + unsigned int scale_h, scale_v; + int ret; + + /* + * 5. Apply iterative camera S_FMT for camera user window (also updates + * client crop cache and the imaginary sub-rectangle). + */ + ret = client_s_fmt(icd, &mf_tmp, ceu_can_scale); + if (ret < 0) + return ret; + + dev_geo(dev, "5: camera scaled to %ux%u\n", + mf_tmp.width, mf_tmp.height); + + /* 6. Retrieve camera output window (g_fmt) */ + + /* unneeded - it is already in "mf_tmp" */ + + /* 7. Calculate new client scales. */ + scale_h = calc_generic_scale(cam->rect.width, mf_tmp.width); + scale_v = calc_generic_scale(cam->rect.height, mf_tmp.height); + + mf->width = mf_tmp.width; + mf->height = mf_tmp.height; + mf->colorspace = mf_tmp.colorspace; + + /* + * 8. Calculate new CEU crop - apply camera scales to previously + * updated "effective" crop. + */ + *width = scale_down(cam->subrect.width, scale_h); + *height = scale_down(cam->subrect.height, scale_v); + + dev_geo(dev, "8: new client sub-window %ux%u\n", *width, *height); + + return 0; +} + +/* + * CEU can scale and crop, but we don't want to waste bandwidth and kill the + * framerate by always requesting the maximum image from the client. See + * Documentation/video4linux/sh_mobile_ceu_camera.txt for a description of + * scaling and cropping algorithms and for the meaning of referenced here steps. + */ +static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd, + struct v4l2_crop *a) +{ + struct v4l2_rect *rect = &a->c; + struct device *dev = icd->parent; + struct soc_camera_host *ici = to_soc_camera_host(dev); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + struct v4l2_crop cam_crop; + struct sh_mobile_ceu_cam *cam = icd->host_priv; + struct v4l2_rect *cam_rect = &cam_crop.c; + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + struct v4l2_mbus_framefmt mf; + unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v, + out_width, out_height; + int interm_width, interm_height; + u32 capsr, cflcr; + int ret; + + dev_geo(dev, "S_CROP(%ux%u@%u:%u)\n", rect->width, rect->height, + rect->left, rect->top); + + /* During camera cropping its output window can change too, stop CEU */ + capsr = capture_save_reset(pcdev); + dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr); + + /* + * 1. - 2. Apply iterative camera S_CROP for new input window, read back + * actual camera rectangle. + */ + ret = client_s_crop(icd, a, &cam_crop); + if (ret < 0) + return ret; + + dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n", + cam_rect->width, cam_rect->height, + cam_rect->left, cam_rect->top); + + /* On success cam_crop contains current camera crop */ + + /* 3. Retrieve camera output window */ + ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf); + if (ret < 0) + return ret; + + if (mf.width > pcdev->max_width || mf.height > pcdev->max_height) + return -EINVAL; + + /* 4. Calculate camera scales */ + scale_cam_h = calc_generic_scale(cam_rect->width, mf.width); + scale_cam_v = calc_generic_scale(cam_rect->height, mf.height); + + /* Calculate intermediate window */ + interm_width = scale_down(rect->width, scale_cam_h); + interm_height = scale_down(rect->height, scale_cam_v); + + if (interm_width < icd->user_width) { + u32 new_scale_h; + + new_scale_h = calc_generic_scale(rect->width, icd->user_width); + + mf.width = scale_down(cam_rect->width, new_scale_h); + } + + if (interm_height < icd->user_height) { + u32 new_scale_v; + + new_scale_v = calc_generic_scale(rect->height, icd->user_height); + + mf.height = scale_down(cam_rect->height, new_scale_v); + } + + if (interm_width < icd->user_width || interm_height < icd->user_height) { + ret = v4l2_device_call_until_err(sd->v4l2_dev, + soc_camera_grp_id(icd), video, + s_mbus_fmt, &mf); + if (ret < 0) + return ret; + + dev_geo(dev, "New camera output %ux%u\n", mf.width, mf.height); + scale_cam_h = calc_generic_scale(cam_rect->width, mf.width); + scale_cam_v = calc_generic_scale(cam_rect->height, mf.height); + interm_width = scale_down(rect->width, scale_cam_h); + interm_height = scale_down(rect->height, scale_cam_v); + } + + /* Cache camera output window */ + cam->width = mf.width; + cam->height = mf.height; + + if (pcdev->image_mode) { + out_width = min(interm_width, icd->user_width); + out_height = min(interm_height, icd->user_height); + } else { + out_width = interm_width; + out_height = interm_height; + } + + /* + * 5. Calculate CEU scales from camera scales from results of (5) and + * the user window + */ + scale_ceu_h = calc_scale(interm_width, &out_width); + scale_ceu_v = calc_scale(interm_height, &out_height); + + dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v); + + /* Apply CEU scales. */ + cflcr = scale_ceu_h | (scale_ceu_v << 16); + if (cflcr != pcdev->cflcr) { + pcdev->cflcr = cflcr; + ceu_write(pcdev, CFLCR, cflcr); + } + + icd->user_width = out_width & ~3; + icd->user_height = out_height & ~3; + /* Offsets are applied at the CEU scaling filter input */ + cam->ceu_left = scale_down(rect->left - cam_rect->left, scale_cam_h) & ~1; + cam->ceu_top = scale_down(rect->top - cam_rect->top, scale_cam_v) & ~1; + + /* 6. Use CEU cropping to crop to the new window. */ + sh_mobile_ceu_set_rect(icd); + + cam->subrect = *rect; + + dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n", + icd->user_width, icd->user_height, + cam->ceu_left, cam->ceu_top); + + /* Restore capture. The CE bit can be cleared by the hardware */ + if (pcdev->active) + capsr |= 1; + capture_restore(pcdev, capsr); + + /* Even if only camera cropping succeeded */ + return ret; +} + +static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd, + struct v4l2_crop *a) +{ + struct sh_mobile_ceu_cam *cam = icd->host_priv; + + a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + a->c = cam->subrect; + + return 0; +} + +/* + * Calculate real client output window by applying new scales to the current + * client crop. New scales are calculated from the requested output format and + * CEU crop, mapped backed onto the client input (subrect). + */ +static void calculate_client_output(struct soc_camera_device *icd, + const struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf) +{ + struct sh_mobile_ceu_cam *cam = icd->host_priv; + struct device *dev = icd->parent; + struct v4l2_rect *cam_subrect = &cam->subrect; + unsigned int scale_v, scale_h; + + if (cam_subrect->width == cam->rect.width && + cam_subrect->height == cam->rect.height) { + /* No sub-cropping */ + mf->width = pix->width; + mf->height = pix->height; + return; + } + + /* 1.-2. Current camera scales and subwin - cached. */ + + dev_geo(dev, "2: subwin %ux%u@%u:%u\n", + cam_subrect->width, cam_subrect->height, + cam_subrect->left, cam_subrect->top); + + /* + * 3. Calculate new combined scales from input sub-window to requested + * user window. + */ + + /* + * TODO: CEU cannot scale images larger than VGA to smaller than SubQCIF + * (128x96) or larger than VGA + */ + scale_h = calc_generic_scale(cam_subrect->width, pix->width); + scale_v = calc_generic_scale(cam_subrect->height, pix->height); + + dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v); + + /* + * 4. Calculate desired client output window by applying combined scales + * to client (real) input window. + */ + mf->width = scale_down(cam->rect.width, scale_h); + mf->height = scale_down(cam->rect.height, scale_v); +} + +/* Similar to set_crop multistage iterative algorithm */ +static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd, + struct v4l2_format *f) +{ + struct device *dev = icd->parent; + struct soc_camera_host *ici = to_soc_camera_host(dev); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + struct sh_mobile_ceu_cam *cam = icd->host_priv; + struct v4l2_pix_format *pix = &f->fmt.pix; + struct v4l2_mbus_framefmt mf; + __u32 pixfmt = pix->pixelformat; + const struct soc_camera_format_xlate *xlate; + /* Keep Compiler Happy */ + unsigned int ceu_sub_width = 0, ceu_sub_height = 0; + u16 scale_v, scale_h; + int ret; + bool image_mode; + enum v4l2_field field; + + switch (pix->field) { + default: + pix->field = V4L2_FIELD_NONE; + /* fall-through */ + case V4L2_FIELD_INTERLACED_TB: + case V4L2_FIELD_INTERLACED_BT: + case V4L2_FIELD_NONE: + field = pix->field; + break; + case V4L2_FIELD_INTERLACED: + field = V4L2_FIELD_INTERLACED_TB; + break; + } + + xlate = soc_camera_xlate_by_fourcc(icd, pixfmt); + if (!xlate) { + dev_warn(dev, "Format %x not found\n", pixfmt); + return -EINVAL; + } + + /* 1.-4. Calculate desired client output geometry */ + calculate_client_output(icd, pix, &mf); + mf.field = pix->field; + mf.colorspace = pix->colorspace; + mf.code = xlate->code; + + switch (pixfmt) { + case V4L2_PIX_FMT_NV12: + case V4L2_PIX_FMT_NV21: + case V4L2_PIX_FMT_NV16: + case V4L2_PIX_FMT_NV61: + image_mode = true; + break; + default: + image_mode = false; + } + + dev_geo(dev, "S_FMT(pix=0x%x, fld 0x%x, code 0x%x, %ux%u)\n", pixfmt, mf.field, mf.code, + pix->width, pix->height); + + dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height); + + /* 5. - 9. */ + ret = client_scale(icd, &mf, &ceu_sub_width, &ceu_sub_height, + image_mode && V4L2_FIELD_NONE == field); + + dev_geo(dev, "5-9: client scale return %d\n", ret); + + /* Done with the camera. Now see if we can improve the result */ + + dev_geo(dev, "fmt %ux%u, requested %ux%u\n", + mf.width, mf.height, pix->width, pix->height); + if (ret < 0) + return ret; + + if (mf.code != xlate->code) + return -EINVAL; + + /* 9. Prepare CEU crop */ + cam->width = mf.width; + cam->height = mf.height; + + /* 10. Use CEU scaling to scale to the requested user window. */ + + /* We cannot scale up */ + if (pix->width > ceu_sub_width) + ceu_sub_width = pix->width; + + if (pix->height > ceu_sub_height) + ceu_sub_height = pix->height; + + pix->colorspace = mf.colorspace; + + if (image_mode) { + /* Scale pix->{width x height} down to width x height */ + scale_h = calc_scale(ceu_sub_width, &pix->width); + scale_v = calc_scale(ceu_sub_height, &pix->height); + } else { + pix->width = ceu_sub_width; + pix->height = ceu_sub_height; + scale_h = 0; + scale_v = 0; + } + + pcdev->cflcr = scale_h | (scale_v << 16); + + /* + * We have calculated CFLCR, the actual configuration will be performed + * in sh_mobile_ceu_set_bus_param() + */ + + dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n", + ceu_sub_width, scale_h, pix->width, + ceu_sub_height, scale_v, pix->height); + + cam->code = xlate->code; + icd->current_fmt = xlate; + + pcdev->field = field; + pcdev->image_mode = image_mode; + + /* CFSZR requirement */ + pix->width &= ~3; + pix->height &= ~3; + + return 0; +} + +#define CEU_CHDW_MAX 8188U /* Maximum line stride */ + +static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd, + struct v4l2_format *f) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + const struct soc_camera_format_xlate *xlate; + struct v4l2_pix_format *pix = &f->fmt.pix; + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + struct v4l2_mbus_framefmt mf; + __u32 pixfmt = pix->pixelformat; + int width, height; + int ret; + + dev_geo(icd->parent, "TRY_FMT(pix=0x%x, %ux%u)\n", + pixfmt, pix->width, pix->height); + + xlate = soc_camera_xlate_by_fourcc(icd, pixfmt); + if (!xlate) { + xlate = icd->current_fmt; + dev_dbg(icd->parent, "Format %x not found, keeping %x\n", + pixfmt, xlate->host_fmt->fourcc); + pixfmt = xlate->host_fmt->fourcc; + pix->pixelformat = pixfmt; + pix->colorspace = icd->colorspace; + } + + /* FIXME: calculate using depth and bus width */ + + /* CFSZR requires height and width to be 4-pixel aligned */ + v4l_bound_align_image(&pix->width, 2, pcdev->max_width, 2, + &pix->height, 4, pcdev->max_height, 2, 0); + + width = pix->width; + height = pix->height; + + /* limit to sensor capabilities */ + mf.width = pix->width; + mf.height = pix->height; + mf.field = pix->field; + mf.code = xlate->code; + mf.colorspace = pix->colorspace; + + ret = v4l2_device_call_until_err(sd->v4l2_dev, soc_camera_grp_id(icd), + 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; + + switch (pixfmt) { + case V4L2_PIX_FMT_NV12: + case V4L2_PIX_FMT_NV21: + case V4L2_PIX_FMT_NV16: + case V4L2_PIX_FMT_NV61: + /* FIXME: check against rect_max after converting soc-camera */ + /* We can scale precisely, need a bigger image from camera */ + if (pix->width < width || pix->height < height) { + /* + * We presume, the sensor behaves sanely, i.e., if + * requested a bigger rectangle, it will not return a + * smaller one. + */ + mf.width = pcdev->max_width; + mf.height = pcdev->max_height; + ret = v4l2_device_call_until_err(sd->v4l2_dev, + soc_camera_grp_id(icd), video, + try_mbus_fmt, &mf); + if (ret < 0) { + /* Shouldn't actually happen... */ + dev_err(icd->parent, + "FIXME: client try_fmt() = %d\n", ret); + return ret; + } + } + /* We will scale exactly */ + if (mf.width > width) + pix->width = width; + if (mf.height > height) + pix->height = height; + + pix->bytesperline = max(pix->bytesperline, pix->width); + pix->bytesperline = min(pix->bytesperline, CEU_CHDW_MAX); + pix->bytesperline &= ~3; + break; + + default: + /* Configurable stride isn't supported in pass-through mode. */ + pix->bytesperline = 0; + } + + pix->width &= ~3; + pix->height &= ~3; + pix->sizeimage = 0; + + dev_geo(icd->parent, "%s(): return %d, fmt 0x%x, %ux%u\n", + __func__, ret, pix->pixelformat, pix->width, pix->height); + + return ret; +} + +static int sh_mobile_ceu_set_livecrop(struct soc_camera_device *icd, + struct v4l2_crop *a) +{ + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct sh_mobile_ceu_dev *pcdev = ici->priv; + u32 out_width = icd->user_width, out_height = icd->user_height; + int ret; + + /* Freeze queue */ + pcdev->frozen = 1; + /* Wait for frame */ + ret = wait_for_completion_interruptible(&pcdev->complete); + /* Stop the client */ + ret = v4l2_subdev_call(sd, video, s_stream, 0); + if (ret < 0) + dev_warn(icd->parent, + "Client failed to stop the stream: %d\n", ret); + else + /* Do the crop, if it fails, there's nothing more we can do */ + sh_mobile_ceu_set_crop(icd, a); + + dev_geo(icd->parent, "Output after crop: %ux%u\n", icd->user_width, icd->user_height); + + if (icd->user_width != out_width || icd->user_height != out_height) { + struct v4l2_format f = { + .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, + .fmt.pix = { + .width = out_width, + .height = out_height, + .pixelformat = icd->current_fmt->host_fmt->fourcc, + .field = pcdev->field, + .colorspace = icd->colorspace, + }, + }; + ret = sh_mobile_ceu_set_fmt(icd, &f); + if (!ret && (out_width != f.fmt.pix.width || + out_height != f.fmt.pix.height)) + ret = -EINVAL; + if (!ret) { + icd->user_width = out_width & ~3; + icd->user_height = out_height & ~3; + ret = sh_mobile_ceu_set_bus_param(icd); + } + } + + /* Thaw the queue */ + pcdev->frozen = 0; + spin_lock_irq(&pcdev->lock); + sh_mobile_ceu_capture(pcdev); + spin_unlock_irq(&pcdev->lock); + /* Start the client */ + ret = v4l2_subdev_call(sd, video, s_stream, 1); + return ret; +} + +static unsigned int sh_mobile_ceu_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 sh_mobile_ceu_querycap(struct soc_camera_host *ici, + struct v4l2_capability *cap) +{ + strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card)); + cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING; + return 0; +} + +static int sh_mobile_ceu_init_videobuf(struct vb2_queue *q, + struct soc_camera_device *icd) +{ + q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + q->io_modes = VB2_MMAP | VB2_USERPTR; + q->drv_priv = icd; + q->ops = &sh_mobile_ceu_videobuf_ops; + q->mem_ops = &vb2_dma_contig_memops; + q->buf_struct_size = sizeof(struct sh_mobile_ceu_buffer); + + return vb2_queue_init(q); +} + +static struct soc_camera_host_ops sh_mobile_ceu_host_ops = { + .owner = THIS_MODULE, + .add = sh_mobile_ceu_add_device, + .remove = sh_mobile_ceu_remove_device, + .get_formats = sh_mobile_ceu_get_formats, + .put_formats = sh_mobile_ceu_put_formats, + .get_crop = sh_mobile_ceu_get_crop, + .set_crop = sh_mobile_ceu_set_crop, + .set_livecrop = sh_mobile_ceu_set_livecrop, + .set_fmt = sh_mobile_ceu_set_fmt, + .try_fmt = sh_mobile_ceu_try_fmt, + .poll = sh_mobile_ceu_poll, + .querycap = sh_mobile_ceu_querycap, + .set_bus_param = sh_mobile_ceu_set_bus_param, + .init_videobuf2 = sh_mobile_ceu_init_videobuf, +}; + +struct bus_wait { + struct notifier_block notifier; + struct completion completion; + struct device *dev; +}; + +static int bus_notify(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = data; + struct bus_wait *wait = container_of(nb, struct bus_wait, notifier); + + if (wait->dev != dev) + return NOTIFY_DONE; + + switch (action) { + case BUS_NOTIFY_UNBOUND_DRIVER: + /* Protect from module unloading */ + wait_for_completion(&wait->completion); + return NOTIFY_OK; + } + return NOTIFY_DONE; +} + +static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev) +{ + struct sh_mobile_ceu_dev *pcdev; + struct resource *res; + void __iomem *base; + unsigned int irq; + int err = 0; + struct bus_wait wait = { + .completion = COMPLETION_INITIALIZER_ONSTACK(wait.completion), + .notifier.notifier_call = bus_notify, + }; + struct sh_mobile_ceu_companion *csi2; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + irq = platform_get_irq(pdev, 0); + if (!res || (int)irq <= 0) { + dev_err(&pdev->dev, "Not enough CEU platform resources.\n"); + err = -ENODEV; + goto exit; + } + + pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL); + if (!pcdev) { + dev_err(&pdev->dev, "Could not allocate pcdev\n"); + err = -ENOMEM; + goto exit; + } + + INIT_LIST_HEAD(&pcdev->capture); + spin_lock_init(&pcdev->lock); + init_completion(&pcdev->complete); + + pcdev->pdata = pdev->dev.platform_data; + if (!pcdev->pdata) { + err = -EINVAL; + dev_err(&pdev->dev, "CEU platform data not set.\n"); + goto exit_kfree; + } + + pcdev->max_width = pcdev->pdata->max_width ? : 2560; + pcdev->max_height = pcdev->pdata->max_height ? : 1920; + + base = ioremap_nocache(res->start, resource_size(res)); + if (!base) { + err = -ENXIO; + dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n"); + goto exit_kfree; + } + + pcdev->irq = irq; + pcdev->base = base; + pcdev->video_limit = 0; /* only enabled if second resource exists */ + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (res) { + err = dma_declare_coherent_memory(&pdev->dev, res->start, + res->start, + resource_size(res), + DMA_MEMORY_MAP | + DMA_MEMORY_EXCLUSIVE); + if (!err) { + dev_err(&pdev->dev, "Unable to declare CEU memory.\n"); + err = -ENXIO; + goto exit_iounmap; + } + + pcdev->video_limit = resource_size(res); + } + + /* request irq */ + err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED, + dev_name(&pdev->dev), pcdev); + if (err) { + dev_err(&pdev->dev, "Unable to register CEU interrupt.\n"); + goto exit_release_mem; + } + + pm_suspend_ignore_children(&pdev->dev, true); + pm_runtime_enable(&pdev->dev); + pm_runtime_resume(&pdev->dev); + + pcdev->ici.priv = pcdev; + pcdev->ici.v4l2_dev.dev = &pdev->dev; + pcdev->ici.nr = pdev->id; + pcdev->ici.drv_name = dev_name(&pdev->dev); + pcdev->ici.ops = &sh_mobile_ceu_host_ops; + pcdev->ici.capabilities = SOCAM_HOST_CAP_STRIDE; + + pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev); + if (IS_ERR(pcdev->alloc_ctx)) { + err = PTR_ERR(pcdev->alloc_ctx); + goto exit_free_clk; + } + + err = soc_camera_host_register(&pcdev->ici); + if (err) + goto exit_free_ctx; + + /* CSI2 interfacing */ + csi2 = pcdev->pdata->csi2; + if (csi2) { + struct platform_device *csi2_pdev = + platform_device_alloc("sh-mobile-csi2", csi2->id); + struct sh_csi2_pdata *csi2_pdata = csi2->platform_data; + + if (!csi2_pdev) { + err = -ENOMEM; + goto exit_host_unregister; + } + + pcdev->csi2_pdev = csi2_pdev; + + err = platform_device_add_data(csi2_pdev, csi2_pdata, sizeof(*csi2_pdata)); + if (err < 0) + goto exit_pdev_put; + + csi2_pdata = csi2_pdev->dev.platform_data; + csi2_pdata->v4l2_dev = &pcdev->ici.v4l2_dev; + + csi2_pdev->resource = csi2->resource; + csi2_pdev->num_resources = csi2->num_resources; + + err = platform_device_add(csi2_pdev); + if (err < 0) + goto exit_pdev_put; + + wait.dev = &csi2_pdev->dev; + + err = bus_register_notifier(&platform_bus_type, &wait.notifier); + if (err < 0) + goto exit_pdev_unregister; + + /* + * From this point the driver module will not unload, until + * we complete the completion. + */ + + if (!csi2_pdev->dev.driver) { + complete(&wait.completion); + /* Either too late, or probing failed */ + bus_unregister_notifier(&platform_bus_type, &wait.notifier); + err = -ENXIO; + goto exit_pdev_unregister; + } + + /* + * The module is still loaded, in the worst case it is hanging + * in device release on our completion. So, _now_ dereferencing + * the "owner" is safe! + */ + + err = try_module_get(csi2_pdev->dev.driver->owner); + + /* Let notifier complete, if it has been locked */ + complete(&wait.completion); + bus_unregister_notifier(&platform_bus_type, &wait.notifier); + if (!err) { + err = -ENODEV; + goto exit_pdev_unregister; + } + } + + return 0; + +exit_pdev_unregister: + platform_device_del(pcdev->csi2_pdev); +exit_pdev_put: + pcdev->csi2_pdev->resource = NULL; + platform_device_put(pcdev->csi2_pdev); +exit_host_unregister: + soc_camera_host_unregister(&pcdev->ici); +exit_free_ctx: + vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx); +exit_free_clk: + pm_runtime_disable(&pdev->dev); + free_irq(pcdev->irq, pcdev); +exit_release_mem: + if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) + dma_release_declared_memory(&pdev->dev); +exit_iounmap: + iounmap(base); +exit_kfree: + kfree(pcdev); +exit: + return err; +} + +static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev) +{ + struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev); + struct sh_mobile_ceu_dev *pcdev = container_of(soc_host, + struct sh_mobile_ceu_dev, ici); + struct platform_device *csi2_pdev = pcdev->csi2_pdev; + + soc_camera_host_unregister(soc_host); + pm_runtime_disable(&pdev->dev); + free_irq(pcdev->irq, pcdev); + if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) + dma_release_declared_memory(&pdev->dev); + iounmap(pcdev->base); + vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx); + if (csi2_pdev && csi2_pdev->dev.driver) { + struct module *csi2_drv = csi2_pdev->dev.driver->owner; + platform_device_del(csi2_pdev); + csi2_pdev->resource = NULL; + platform_device_put(csi2_pdev); + module_put(csi2_drv); + } + kfree(pcdev); + + return 0; +} + +static int sh_mobile_ceu_runtime_nop(struct device *dev) +{ + /* Runtime PM callback shared between ->runtime_suspend() + * and ->runtime_resume(). Simply returns success. + * + * This driver re-initializes all registers after + * pm_runtime_get_sync() anyway so there is no need + * to save and restore registers here. + */ + return 0; +} + +static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = { + .runtime_suspend = sh_mobile_ceu_runtime_nop, + .runtime_resume = sh_mobile_ceu_runtime_nop, +}; + +static struct platform_driver sh_mobile_ceu_driver = { + .driver = { + .name = "sh_mobile_ceu", + .pm = &sh_mobile_ceu_dev_pm_ops, + }, + .probe = sh_mobile_ceu_probe, + .remove = __devexit_p(sh_mobile_ceu_remove), +}; + +static int __init sh_mobile_ceu_init(void) +{ + /* Whatever return code */ + request_module("sh_mobile_csi2"); + return platform_driver_register(&sh_mobile_ceu_driver); +} + +static void __exit sh_mobile_ceu_exit(void) +{ + platform_driver_unregister(&sh_mobile_ceu_driver); +} + +module_init(sh_mobile_ceu_init); +module_exit(sh_mobile_ceu_exit); + +MODULE_DESCRIPTION("SuperH Mobile CEU driver"); +MODULE_AUTHOR("Magnus Damm"); +MODULE_LICENSE("GPL"); +MODULE_VERSION("0.0.6"); +MODULE_ALIAS("platform:sh_mobile_ceu"); |