--- /dev/null
+/*
+ * 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/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/moduleparam.h>
+#include <linux/time.h>
+#include <linux/version.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-common.h>
+#include <media/v4l2-dev.h>
+#include <media/soc_camera.h>
+#include <media/sh_mobile_ceu.h>
+#include <media/videobuf-dma-contig.h>
+
+/* register offsets for sh7722 / sh7723 */
+
+#define CAPSR 0x00
+#define CAPCR 0x04
+#define CAMCR 0x08
+#define CMCYR 0x0c
+#define CAMOR 0x10
+#define CAPWR 0x14
+#define CAIFR 0x18
+#define CSTCR 0x20 /* not on sh7723 */
+#define CSECR 0x24 /* not on sh7723 */
+#define CRCNTR 0x28
+#define CRCMPR 0x2c
+#define CFLCR 0x30
+#define CFSZR 0x34
+#define CDWDR 0x38
+#define CDAYR 0x3c
+#define CDACR 0x40
+#define CDBYR 0x44
+#define CDBCR 0x48
+#define CBDSR 0x4c
+#define CFWCR 0x5c
+#define CLFCR 0x60
+#define CDOCR 0x64
+#define CDDCR 0x68
+#define CDDAR 0x6c
+#define CEIER 0x70
+#define CETCR 0x74
+#define CSTSR 0x7c
+#define CSRTR 0x80
+#define CDSSR 0x84
+#define CDAYR2 0x90
+#define CDACR2 0x94
+#define CDBYR2 0x98
+#define CDBCR2 0x9c
+
+static DEFINE_MUTEX(camera_lock);
+
+/* per video frame buffer */
+struct sh_mobile_ceu_buffer {
+ struct videobuf_buffer vb; /* v4l buffer must be first */
+ const struct soc_camera_data_format *fmt;
+};
+
+struct sh_mobile_ceu_dev {
+ struct device *dev;
+ struct soc_camera_host ici;
+ struct soc_camera_device *icd;
+
+ unsigned int irq;
+ void __iomem *base;
+ unsigned long video_limit;
+
+ spinlock_t lock;
+ struct list_head capture;
+ struct videobuf_buffer *active;
+
+ struct sh_mobile_ceu_info *pdata;
+};
+
+static void ceu_write(struct sh_mobile_ceu_dev *priv,
+ unsigned long reg_offs, unsigned long data)
+{
+ iowrite32(data, priv->base + reg_offs);
+}
+
+static unsigned long ceu_read(struct sh_mobile_ceu_dev *priv,
+ unsigned long reg_offs)
+{
+ return ioread32(priv->base + reg_offs);
+}
+
+/*
+ * Videobuf operations
+ */
+static int sh_mobile_ceu_videobuf_setup(struct videobuf_queue *vq,
+ unsigned int *count,
+ unsigned int *size)
+{
+ struct soc_camera_device *icd = vq->priv_data;
+ struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
+ struct sh_mobile_ceu_dev *pcdev = ici->priv;
+ int bytes_per_pixel = (icd->current_fmt->depth + 7) >> 3;
+
+ *size = PAGE_ALIGN(icd->width * icd->height * bytes_per_pixel);
+
+ if (0 == *count)
+ *count = 2;
+
+ if (pcdev->video_limit) {
+ while (*size * *count > pcdev->video_limit)
+ (*count)--;
+ }
+
+ dev_dbg(&icd->dev, "count=%d, size=%d\n", *count, *size);
+
+ return 0;
+}
+
+static void free_buffer(struct videobuf_queue *vq,
+ struct sh_mobile_ceu_buffer *buf)
+{
+ struct soc_camera_device *icd = vq->priv_data;
+
+ dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
+ &buf->vb, buf->vb.baddr, buf->vb.bsize);
+
+ if (in_interrupt())
+ BUG();
+
+ videobuf_dma_contig_free(vq, &buf->vb);
+ dev_dbg(&icd->dev, "%s freed\n", __func__);
+ buf->vb.state = VIDEOBUF_NEEDS_INIT;
+}
+
+static void sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
+{
+ ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~1);
+ ceu_write(pcdev, CETCR, ~ceu_read(pcdev, CETCR) & 0x0317f313);
+ ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | 1);
+
+ ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~0x10000);
+
+ ceu_write(pcdev, CETCR, 0x0317f313 ^ 0x10);
+
+ if (pcdev->active) {
+ ceu_write(pcdev, CDAYR, videobuf_to_dma_contig(pcdev->active));
+ ceu_write(pcdev, CAPSR, 0x1); /* start capture */
+ }
+}
+
+static int sh_mobile_ceu_videobuf_prepare(struct videobuf_queue *vq,
+ struct videobuf_buffer *vb,
+ enum v4l2_field field)
+{
+ struct soc_camera_device *icd = vq->priv_data;
+ struct sh_mobile_ceu_buffer *buf;
+ int ret;
+
+ buf = container_of(vb, struct sh_mobile_ceu_buffer, vb);
+
+ dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
+ vb, vb->baddr, vb->bsize);
+
+ /* Added list head initialization on alloc */
+ WARN_ON(!list_empty(&vb->queue));
+
+#ifdef DEBUG
+ /* This can be useful if you want to see if we actually fill
+ * the buffer with something */
+ memset((void *)vb->baddr, 0xaa, vb->bsize);
+#endif
+
+ BUG_ON(NULL == icd->current_fmt);
+
+ if (buf->fmt != icd->current_fmt ||
+ vb->width != icd->width ||
+ vb->height != icd->height ||
+ vb->field != field) {
+ buf->fmt = icd->current_fmt;
+ vb->width = icd->width;
+ vb->height = icd->height;
+ vb->field = field;
+ vb->state = VIDEOBUF_NEEDS_INIT;
+ }
+
+ vb->size = vb->width * vb->height * ((buf->fmt->depth + 7) >> 3);
+ if (0 != vb->baddr && vb->bsize < vb->size) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (vb->state == VIDEOBUF_NEEDS_INIT) {
+ ret = videobuf_iolock(vq, vb, NULL);
+ if (ret)
+ goto fail;
+ vb->state = VIDEOBUF_PREPARED;
+ }
+
+ return 0;
+fail:
+ free_buffer(vq, buf);
+out:
+ return ret;
+}
+
+static void sh_mobile_ceu_videobuf_queue(struct videobuf_queue *vq,
+ struct videobuf_buffer *vb)
+{
+ struct soc_camera_device *icd = vq->priv_data;
+ struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
+ struct sh_mobile_ceu_dev *pcdev = ici->priv;
+ unsigned long flags;
+
+ dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
+ vb, vb->baddr, vb->bsize);
+
+ vb->state = VIDEOBUF_ACTIVE;
+ spin_lock_irqsave(&pcdev->lock, flags);
+ list_add_tail(&vb->queue, &pcdev->capture);
+
+ if (!pcdev->active) {
+ pcdev->active = vb;
+ sh_mobile_ceu_capture(pcdev);
+ }
+
+ spin_unlock_irqrestore(&pcdev->lock, flags);
+}
+
+static void sh_mobile_ceu_videobuf_release(struct videobuf_queue *vq,
+ struct videobuf_buffer *vb)
+{
+ free_buffer(vq, container_of(vb, struct sh_mobile_ceu_buffer, vb));
+}
+
+static struct videobuf_queue_ops sh_mobile_ceu_videobuf_ops = {
+ .buf_setup = sh_mobile_ceu_videobuf_setup,
+ .buf_prepare = sh_mobile_ceu_videobuf_prepare,
+ .buf_queue = sh_mobile_ceu_videobuf_queue,
+ .buf_release = sh_mobile_ceu_videobuf_release,
+};
+
+static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
+{
+ struct sh_mobile_ceu_dev *pcdev = data;
+ struct videobuf_buffer *vb;
+ unsigned long flags;
+
+ spin_lock_irqsave(&pcdev->lock, flags);
+
+ vb = pcdev->active;
+ list_del_init(&vb->queue);
+
+ if (!list_empty(&pcdev->capture))
+ pcdev->active = list_entry(pcdev->capture.next,
+ struct videobuf_buffer, queue);
+ else
+ pcdev->active = NULL;
+
+ sh_mobile_ceu_capture(pcdev);
+
+ vb->state = VIDEOBUF_DONE;
+ do_gettimeofday(&vb->ts);
+ vb->field_count++;
+ wake_up(&vb->done);
+ spin_unlock_irqrestore(&pcdev->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
+{
+ struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
+ struct sh_mobile_ceu_dev *pcdev = ici->priv;
+ int ret = -EBUSY;
+
+ mutex_lock(&camera_lock);
+
+ if (pcdev->icd)
+ goto err;
+
+ dev_info(&icd->dev,
+ "SuperH Mobile CEU driver attached to camera %d\n",
+ icd->devnum);
+
+ if (pcdev->pdata->enable_camera)
+ pcdev->pdata->enable_camera();
+
+ ret = icd->ops->init(icd);
+ if (ret)
+ goto err;
+
+ ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
+ while (ceu_read(pcdev, CSTSR) & 1)
+ msleep(1);
+
+ pcdev->icd = icd;
+err:
+ mutex_unlock(&camera_lock);
+
+ return ret;
+}
+
+static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
+{
+ struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
+ struct sh_mobile_ceu_dev *pcdev = ici->priv;
+
+ BUG_ON(icd != pcdev->icd);
+
+ /* disable capture, disable interrupts */
+ ceu_write(pcdev, CEIER, 0);
+ ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
+ icd->ops->release(icd);
+ if (pcdev->pdata->disable_camera)
+ pcdev->pdata->disable_camera();
+
+ dev_info(&icd->dev,
+ "SuperH Mobile CEU driver detached from camera %d\n",
+ icd->devnum);
+
+ pcdev->icd = NULL;
+}
+
+static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
+ __u32 pixfmt)
+{
+ struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
+ struct sh_mobile_ceu_dev *pcdev = ici->priv;
+ int ret, buswidth, width, cfszr_width, cdwdr_width;
+ unsigned long camera_flags, common_flags, value;
+
+ camera_flags = icd->ops->query_bus_param(icd);
+ common_flags = soc_camera_bus_param_compatible(camera_flags,
+ pcdev->pdata->flags);
+ if (!common_flags)
+ return -EINVAL;
+
+ ret = icd->ops->set_bus_param(icd, common_flags);
+ if (ret < 0)
+ return ret;
+
+ switch (common_flags & SOCAM_DATAWIDTH_MASK) {
+ case SOCAM_DATAWIDTH_8:
+ buswidth = 8;
+ break;
+ case SOCAM_DATAWIDTH_16:
+ buswidth = 16;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ceu_write(pcdev, CRCNTR, 0);
+ ceu_write(pcdev, CRCMPR, 0);
+
+ value = 0x00000010;
+ value |= (common_flags & SOCAM_VSYNC_ACTIVE_LOW) ? (1 << 1) : 0;
+ value |= (common_flags & SOCAM_HSYNC_ACTIVE_LOW) ? (1 << 0) : 0;
+ value |= (buswidth == 16) ? (1 << 12) : 0;
+ ceu_write(pcdev, CAMCR, value);
+
+ ceu_write(pcdev, CAPCR, 0x00300000);
+ ceu_write(pcdev, CAIFR, 0);
+
+ mdelay(1);
+
+ width = icd->width * (icd->current_fmt->depth / 8);
+ width = (buswidth == 16) ? width / 2 : width;
+ cfszr_width = (buswidth == 8) ? width / 2 : width;
+ cdwdr_width = (buswidth == 16) ? width * 2 : width;
+
+ ceu_write(pcdev, CAMOR, 0);
+ ceu_write(pcdev, CAPWR, (icd->height << 16) | width);
+ ceu_write(pcdev, CFLCR, 0); /* data fetch mode - no scaling */
+ ceu_write(pcdev, CFSZR, (icd->height << 16) | cfszr_width);
+ ceu_write(pcdev, CLFCR, 0); /* data fetch mode - no lowpass filter */
+ ceu_write(pcdev, CDOCR, 0x00000016);
+
+ ceu_write(pcdev, CDWDR, cdwdr_width);
+ ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
+
+ /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
+ /* in data fetch mode: no need for CDACR, CDBYR, CDBCR */
+
+ return 0;
+}
+
+static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
+ __u32 pixfmt)
+{
+ struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
+ struct sh_mobile_ceu_dev *pcdev = ici->priv;
+ unsigned long camera_flags, common_flags;
+
+ camera_flags = icd->ops->query_bus_param(icd);
+ common_flags = soc_camera_bus_param_compatible(camera_flags,
+ pcdev->pdata->flags);
+ if (!common_flags)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int sh_mobile_ceu_set_fmt_cap(struct soc_camera_device *icd,
+ __u32 pixfmt, struct v4l2_rect *rect)
+{
+ return icd->ops->set_fmt_cap(icd, pixfmt, rect);
+}
+
+static int sh_mobile_ceu_try_fmt_cap(struct soc_camera_device *icd,
+ struct v4l2_format *f)
+{
+ /* FIXME: calculate using depth and bus width */
+
+ if (f->fmt.pix.height < 4)
+ f->fmt.pix.height = 4;
+ if (f->fmt.pix.height > 1920)
+ f->fmt.pix.height = 1920;
+ if (f->fmt.pix.width < 2)
+ f->fmt.pix.width = 2;
+ if (f->fmt.pix.width > 2560)
+ f->fmt.pix.width = 2560;
+ f->fmt.pix.width &= ~0x01;
+ f->fmt.pix.height &= ~0x03;
+
+ /* limit to sensor capabilities */
+ return icd->ops->try_fmt_cap(icd, f);
+}
+
+static int sh_mobile_ceu_reqbufs(struct soc_camera_file *icf,
+ struct v4l2_requestbuffers *p)
+{
+ int i;
+
+ /* This is for locking debugging only. I removed spinlocks and now I
+ * check whether .prepare is ever called on a linked buffer, or whether
+ * a dma IRQ can occur for an in-work or unlinked buffer. Until now
+ * it hadn't triggered */
+ for (i = 0; i < p->count; i++) {
+ struct sh_mobile_ceu_buffer *buf;
+
+ buf = container_of(icf->vb_vidq.bufs[i],
+ struct sh_mobile_ceu_buffer, vb);
+ INIT_LIST_HEAD(&buf->vb.queue);
+ }
+
+ return 0;
+}
+
+static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
+{
+ struct soc_camera_file *icf = file->private_data;
+ struct sh_mobile_ceu_buffer *buf;
+
+ buf = list_entry(icf->vb_vidq.stream.next,
+ struct sh_mobile_ceu_buffer, vb.stream);
+
+ poll_wait(file, &buf->vb.done, pt);
+
+ if (buf->vb.state == VIDEOBUF_DONE ||
+ buf->vb.state == VIDEOBUF_ERROR)
+ return POLLIN|POLLRDNORM;
+
+ return 0;
+}
+
+static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
+ struct v4l2_capability *cap)
+{
+ strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
+ cap->version = KERNEL_VERSION(0, 0, 5);
+ cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
+ return 0;
+}
+
+static void sh_mobile_ceu_init_videobuf(struct videobuf_queue *q,
+ struct soc_camera_device *icd)
+{
+ struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
+ struct sh_mobile_ceu_dev *pcdev = ici->priv;
+
+ videobuf_queue_dma_contig_init(q,
+ &sh_mobile_ceu_videobuf_ops,
+ &ici->dev, &pcdev->lock,
+ V4L2_BUF_TYPE_VIDEO_CAPTURE,
+ V4L2_FIELD_NONE,
+ sizeof(struct sh_mobile_ceu_buffer),
+ icd);
+}
+
+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,
+ .set_fmt_cap = sh_mobile_ceu_set_fmt_cap,
+ .try_fmt_cap = sh_mobile_ceu_try_fmt_cap,
+ .reqbufs = sh_mobile_ceu_reqbufs,
+ .poll = sh_mobile_ceu_poll,
+ .querycap = sh_mobile_ceu_querycap,
+ .try_bus_param = sh_mobile_ceu_try_bus_param,
+ .set_bus_param = sh_mobile_ceu_set_bus_param,
+ .init_videobuf = sh_mobile_ceu_init_videobuf,
+};
+
+static int 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;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ irq = platform_get_irq(pdev, 0);
+ if (!res || !irq) {
+ 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;
+ }
+
+ platform_set_drvdata(pdev, pcdev);
+ INIT_LIST_HEAD(&pcdev->capture);
+ spin_lock_init(&pcdev->lock);
+
+ pcdev->pdata = pdev->dev.platform_data;
+ if (!pcdev->pdata) {
+ err = -EINVAL;
+ dev_err(&pdev->dev, "CEU platform data not set.\n");
+ goto exit_kfree;
+ }
+
+ base = ioremap_nocache(res->start, res->end - res->start + 1);
+ 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 */
+ pcdev->dev = &pdev->dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (res) {
+ err = dma_declare_coherent_memory(&pdev->dev, res->start,
+ res->start,
+ (res->end - res->start) + 1,
+ 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 = (res->end - res->start) + 1;
+ }
+
+ /* request irq */
+ err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
+ pdev->dev.bus_id, pcdev);
+ if (err) {
+ dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
+ goto exit_release_mem;
+ }
+
+ pcdev->ici.priv = pcdev;
+ pcdev->ici.dev.parent = &pdev->dev;
+ pcdev->ici.nr = pdev->id;
+ pcdev->ici.drv_name = pdev->dev.bus_id,
+ pcdev->ici.ops = &sh_mobile_ceu_host_ops,
+
+ err = soc_camera_host_register(&pcdev->ici);
+ if (err)
+ goto exit_free_irq;
+
+ return 0;
+
+exit_free_irq:
+ 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 sh_mobile_ceu_remove(struct platform_device *pdev)
+{
+ struct sh_mobile_ceu_dev *pcdev = platform_get_drvdata(pdev);
+
+ soc_camera_host_unregister(&pcdev->ici);
+ free_irq(pcdev->irq, pcdev);
+ if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
+ dma_release_declared_memory(&pdev->dev);
+ iounmap(pcdev->base);
+ kfree(pcdev);
+ return 0;
+}
+
+static struct platform_driver sh_mobile_ceu_driver = {
+ .driver = {
+ .name = "sh_mobile_ceu",
+ },
+ .probe = sh_mobile_ceu_probe,
+ .remove = sh_mobile_ceu_remove,
+};
+
+static int __init sh_mobile_ceu_init(void)
+{
+ return platform_driver_register(&sh_mobile_ceu_driver);
+}
+
+static void __exit sh_mobile_ceu_exit(void)
+{
+ return 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");
projects / linux-2.6 / commitdiff