diff options
Diffstat (limited to 'drivers/media/video/sh_mobile_ceu_camera.c')
| -rw-r--r-- | drivers/media/video/sh_mobile_ceu_camera.c | 658 |
1 files changed, 658 insertions, 0 deletions
diff --git a/drivers/media/video/sh_mobile_ceu_camera.c b/drivers/media/video/sh_mobile_ceu_camera.c new file mode 100644 index 000000000000..f7ca3cb9340a --- /dev/null +++ b/drivers/media/video/sh_mobile_ceu_camera.c @@ -0,0 +1,658 @@ +/* + * 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; + + /* lock used to protect videobuf */ + 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 %zd\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 %zd\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 %zd\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"); |