diff options
Diffstat (limited to 'drivers/media/platform/mx1_camera.c')
| -rw-r--r-- | drivers/media/platform/mx1_camera.c | 889 |
1 files changed, 889 insertions, 0 deletions
diff --git a/drivers/media/platform/mx1_camera.c b/drivers/media/platform/mx1_camera.c new file mode 100644 index 00000000000..d2e6f82ecfa --- /dev/null +++ b/drivers/media/platform/mx1_camera.c @@ -0,0 +1,889 @@ +/* + * V4L2 Driver for i.MXL/i.MXL camera (CSI) host + * + * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt> + * Copyright (C) 2009, Darius Augulis <augulis.darius@gmail.com> + * + * Based on PXA SoC camera driver + * 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 version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/errno.h> +#include <linux/fs.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/mutex.h> +#include <linux/platform_device.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/time.h> +#include <linux/videodev2.h> + +#include <media/soc_camera.h> +#include <media/v4l2-common.h> +#include <media/v4l2-dev.h> +#include <media/videobuf-dma-contig.h> +#include <media/soc_mediabus.h> + +#include <asm/dma.h> +#include <asm/fiq.h> +#include <mach/dma-mx1-mx2.h> +#include <mach/hardware.h> +#include <mach/irqs.h> +#include <mach/mx1_camera.h> + +/* + * CSI registers + */ +#define CSICR1 0x00 /* CSI Control Register 1 */ +#define CSISR 0x08 /* CSI Status Register */ +#define CSIRXR 0x10 /* CSI RxFIFO Register */ + +#define CSICR1_RXFF_LEVEL(x) (((x) & 0x3) << 19) +#define CSICR1_SOF_POL (1 << 17) +#define CSICR1_SOF_INTEN (1 << 16) +#define CSICR1_MCLKDIV(x) (((x) & 0xf) << 12) +#define CSICR1_MCLKEN (1 << 9) +#define CSICR1_FCC (1 << 8) +#define CSICR1_BIG_ENDIAN (1 << 7) +#define CSICR1_CLR_RXFIFO (1 << 5) +#define CSICR1_GCLK_MODE (1 << 4) +#define CSICR1_DATA_POL (1 << 2) +#define CSICR1_REDGE (1 << 1) +#define CSICR1_EN (1 << 0) + +#define CSISR_SFF_OR_INT (1 << 25) +#define CSISR_RFF_OR_INT (1 << 24) +#define CSISR_STATFF_INT (1 << 21) +#define CSISR_RXFF_INT (1 << 18) +#define CSISR_SOF_INT (1 << 16) +#define CSISR_DRDY (1 << 0) + +#define DRIVER_VERSION "0.0.2" +#define DRIVER_NAME "mx1-camera" + +#define CSI_IRQ_MASK (CSISR_SFF_OR_INT | CSISR_RFF_OR_INT | \ + CSISR_STATFF_INT | CSISR_RXFF_INT | CSISR_SOF_INT) + +#define CSI_BUS_FLAGS (V4L2_MBUS_MASTER | V4L2_MBUS_HSYNC_ACTIVE_HIGH | \ + V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW | \ + V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING | \ + V4L2_MBUS_DATA_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_LOW) + +#define MAX_VIDEO_MEM 16 /* Video memory limit in megabytes */ + +/* + * Structures + */ + +/* buffer for one video frame */ +struct mx1_buffer { + /* common v4l buffer stuff -- must be first */ + struct videobuf_buffer vb; + enum v4l2_mbus_pixelcode code; + int inwork; +}; + +/* + * i.MX1/i.MXL is only supposed to handle one camera on its Camera Sensor + * Interface. If anyone ever builds hardware to enable more than + * one camera, they will have to modify this driver too + */ +struct mx1_camera_dev { + struct soc_camera_host soc_host; + struct soc_camera_device *icd; + struct mx1_camera_pdata *pdata; + struct mx1_buffer *active; + struct resource *res; + struct clk *clk; + struct list_head capture; + + void __iomem *base; + int dma_chan; + unsigned int irq; + unsigned long mclk; + + spinlock_t lock; +}; + +/* + * Videobuf operations + */ +static int mx1_videobuf_setup(struct videobuf_queue *vq, unsigned int *count, + unsigned int *size) +{ + struct soc_camera_device *icd = vq->priv_data; + + *size = icd->sizeimage; + + if (!*count) + *count = 32; + + if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024) + *count = (MAX_VIDEO_MEM * 1024 * 1024) / *size; + + dev_dbg(icd->parent, "count=%d, size=%d\n", *count, *size); + + return 0; +} + +static void free_buffer(struct videobuf_queue *vq, struct mx1_buffer *buf) +{ + struct soc_camera_device *icd = vq->priv_data; + struct videobuf_buffer *vb = &buf->vb; + + BUG_ON(in_interrupt()); + + dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__, + vb, vb->baddr, vb->bsize); + + /* + * This waits until this buffer is out of danger, i.e., until it is no + * longer in STATE_QUEUED or STATE_ACTIVE + */ + videobuf_waiton(vq, vb, 0, 0); + videobuf_dma_contig_free(vq, vb); + + vb->state = VIDEOBUF_NEEDS_INIT; +} + +static int mx1_videobuf_prepare(struct videobuf_queue *vq, + struct videobuf_buffer *vb, enum v4l2_field field) +{ + struct soc_camera_device *icd = vq->priv_data; + struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb); + int ret; + + dev_dbg(icd->parent, "%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)); + + BUG_ON(NULL == icd->current_fmt); + + /* + * I think, in buf_prepare you only have to protect global data, + * the actual buffer is yours + */ + buf->inwork = 1; + + if (buf->code != icd->current_fmt->code || + vb->width != icd->user_width || + vb->height != icd->user_height || + vb->field != field) { + buf->code = icd->current_fmt->code; + vb->width = icd->user_width; + vb->height = icd->user_height; + vb->field = field; + vb->state = VIDEOBUF_NEEDS_INIT; + } + + vb->size = icd->sizeimage; + 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; + } + + buf->inwork = 0; + + return 0; + +fail: + free_buffer(vq, buf); +out: + buf->inwork = 0; + return ret; +} + +static int mx1_camera_setup_dma(struct mx1_camera_dev *pcdev) +{ + struct videobuf_buffer *vbuf = &pcdev->active->vb; + struct device *dev = pcdev->icd->parent; + int ret; + + if (unlikely(!pcdev->active)) { + dev_err(dev, "DMA End IRQ with no active buffer\n"); + return -EFAULT; + } + + /* setup sg list for future DMA */ + ret = imx_dma_setup_single(pcdev->dma_chan, + videobuf_to_dma_contig(vbuf), + vbuf->size, pcdev->res->start + + CSIRXR, DMA_MODE_READ); + if (unlikely(ret)) + dev_err(dev, "Failed to setup DMA sg list\n"); + + return ret; +} + +/* Called under spinlock_irqsave(&pcdev->lock, ...) */ +static void mx1_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->parent); + struct mx1_camera_dev *pcdev = ici->priv; + struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb); + + dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__, + vb, vb->baddr, vb->bsize); + + list_add_tail(&vb->queue, &pcdev->capture); + + vb->state = VIDEOBUF_ACTIVE; + + if (!pcdev->active) { + pcdev->active = buf; + + /* setup sg list for future DMA */ + if (!mx1_camera_setup_dma(pcdev)) { + unsigned int temp; + /* enable SOF irq */ + temp = __raw_readl(pcdev->base + CSICR1) | + CSICR1_SOF_INTEN; + __raw_writel(temp, pcdev->base + CSICR1); + } + } +} + +static void mx1_videobuf_release(struct videobuf_queue *vq, + struct videobuf_buffer *vb) +{ + struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb); +#ifdef DEBUG + struct soc_camera_device *icd = vq->priv_data; + struct device *dev = icd->parent; + + dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, + vb, vb->baddr, vb->bsize); + + switch (vb->state) { + case VIDEOBUF_ACTIVE: + dev_dbg(dev, "%s (active)\n", __func__); + break; + case VIDEOBUF_QUEUED: + dev_dbg(dev, "%s (queued)\n", __func__); + break; + case VIDEOBUF_PREPARED: + dev_dbg(dev, "%s (prepared)\n", __func__); + break; + default: + dev_dbg(dev, "%s (unknown)\n", __func__); + break; + } +#endif + + free_buffer(vq, buf); +} + +static void mx1_camera_wakeup(struct mx1_camera_dev *pcdev, + struct videobuf_buffer *vb, + struct mx1_buffer *buf) +{ + /* _init is used to debug races, see comment in mx1_camera_reqbufs() */ + list_del_init(&vb->queue); + vb->state = VIDEOBUF_DONE; + do_gettimeofday(&vb->ts); + vb->field_count++; + wake_up(&vb->done); + + if (list_empty(&pcdev->capture)) { + pcdev->active = NULL; + return; + } + + pcdev->active = list_entry(pcdev->capture.next, + struct mx1_buffer, vb.queue); + + /* setup sg list for future DMA */ + if (likely(!mx1_camera_setup_dma(pcdev))) { + unsigned int temp; + + /* enable SOF irq */ + temp = __raw_readl(pcdev->base + CSICR1) | CSICR1_SOF_INTEN; + __raw_writel(temp, pcdev->base + CSICR1); + } +} + +static void mx1_camera_dma_irq(int channel, void *data) +{ + struct mx1_camera_dev *pcdev = data; + struct device *dev = pcdev->icd->parent; + struct mx1_buffer *buf; + struct videobuf_buffer *vb; + unsigned long flags; + + spin_lock_irqsave(&pcdev->lock, flags); + + imx_dma_disable(channel); + + if (unlikely(!pcdev->active)) { + dev_err(dev, "DMA End IRQ with no active buffer\n"); + goto out; + } + + vb = &pcdev->active->vb; + buf = container_of(vb, struct mx1_buffer, vb); + WARN_ON(buf->inwork || list_empty(&vb->queue)); + dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, + vb, vb->baddr, vb->bsize); + + mx1_camera_wakeup(pcdev, vb, buf); +out: + spin_unlock_irqrestore(&pcdev->lock, flags); +} + +static struct videobuf_queue_ops mx1_videobuf_ops = { + .buf_setup = mx1_videobuf_setup, + .buf_prepare = mx1_videobuf_prepare, + .buf_queue = mx1_videobuf_queue, + .buf_release = mx1_videobuf_release, +}; + +static void mx1_camera_init_videobuf(struct videobuf_queue *q, + struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct mx1_camera_dev *pcdev = ici->priv; + + videobuf_queue_dma_contig_init(q, &mx1_videobuf_ops, icd->parent, + &pcdev->lock, V4L2_BUF_TYPE_VIDEO_CAPTURE, + V4L2_FIELD_NONE, + sizeof(struct mx1_buffer), icd, &icd->video_lock); +} + +static int mclk_get_divisor(struct mx1_camera_dev *pcdev) +{ + unsigned int mclk = pcdev->mclk; + unsigned long div; + unsigned long lcdclk; + + lcdclk = clk_get_rate(pcdev->clk); + + /* + * We verify platform_mclk_10khz != 0, so if anyone breaks it, here + * they get a nice Oops + */ + div = (lcdclk + 2 * mclk - 1) / (2 * mclk) - 1; + + dev_dbg(pcdev->icd->parent, + "System clock %lukHz, target freq %dkHz, divisor %lu\n", + lcdclk / 1000, mclk / 1000, div); + + return div; +} + +static void mx1_camera_activate(struct mx1_camera_dev *pcdev) +{ + unsigned int csicr1 = CSICR1_EN; + + dev_dbg(pcdev->icd->parent, "Activate device\n"); + + clk_enable(pcdev->clk); + + /* enable CSI before doing anything else */ + __raw_writel(csicr1, pcdev->base + CSICR1); + + csicr1 |= CSICR1_MCLKEN | CSICR1_FCC | CSICR1_GCLK_MODE; + csicr1 |= CSICR1_MCLKDIV(mclk_get_divisor(pcdev)); + csicr1 |= CSICR1_RXFF_LEVEL(2); /* 16 words */ + + __raw_writel(csicr1, pcdev->base + CSICR1); +} + +static void mx1_camera_deactivate(struct mx1_camera_dev *pcdev) +{ + dev_dbg(pcdev->icd->parent, "Deactivate device\n"); + + /* Disable all CSI interface */ + __raw_writel(0x00, pcdev->base + CSICR1); + + clk_disable(pcdev->clk); +} + +/* + * The following two functions absolutely depend on the fact, that + * there can be only one camera on i.MX1/i.MXL camera sensor interface + */ +static int mx1_camera_add_device(struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct mx1_camera_dev *pcdev = ici->priv; + + if (pcdev->icd) + return -EBUSY; + + dev_info(icd->parent, "MX1 Camera driver attached to camera %d\n", + icd->devnum); + + mx1_camera_activate(pcdev); + + pcdev->icd = icd; + + return 0; +} + +static void mx1_camera_remove_device(struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct mx1_camera_dev *pcdev = ici->priv; + unsigned int csicr1; + + BUG_ON(icd != pcdev->icd); + + /* disable interrupts */ + csicr1 = __raw_readl(pcdev->base + CSICR1) & ~CSI_IRQ_MASK; + __raw_writel(csicr1, pcdev->base + CSICR1); + + /* Stop DMA engine */ + imx_dma_disable(pcdev->dma_chan); + + dev_info(icd->parent, "MX1 Camera driver detached from camera %d\n", + icd->devnum); + + mx1_camera_deactivate(pcdev); + + pcdev->icd = NULL; +} + +static int mx1_camera_set_crop(struct soc_camera_device *icd, + struct v4l2_crop *a) +{ + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + + return v4l2_subdev_call(sd, video, s_crop, a); +} + +static int mx1_camera_set_bus_param(struct soc_camera_device *icd) +{ + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct mx1_camera_dev *pcdev = ici->priv; + struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,}; + unsigned long common_flags; + unsigned int csicr1; + int ret; + + /* MX1 supports only 8bit buswidth */ + ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg); + if (!ret) { + common_flags = soc_mbus_config_compatible(&cfg, CSI_BUS_FLAGS); + if (!common_flags) { + dev_warn(icd->parent, + "Flags incompatible: camera 0x%x, host 0x%x\n", + cfg.flags, CSI_BUS_FLAGS); + return -EINVAL; + } + } else if (ret != -ENOIOCTLCMD) { + return ret; + } else { + common_flags = CSI_BUS_FLAGS; + } + + /* Make choises, based on platform choice */ + if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) && + (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) { + if (!pcdev->pdata || + pcdev->pdata->flags & MX1_CAMERA_VSYNC_HIGH) + common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW; + else + common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH; + } + + if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) && + (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) { + if (!pcdev->pdata || + pcdev->pdata->flags & MX1_CAMERA_PCLK_RISING) + common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING; + else + common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING; + } + + if ((common_flags & V4L2_MBUS_DATA_ACTIVE_HIGH) && + (common_flags & V4L2_MBUS_DATA_ACTIVE_LOW)) { + if (!pcdev->pdata || + pcdev->pdata->flags & MX1_CAMERA_DATA_HIGH) + common_flags &= ~V4L2_MBUS_DATA_ACTIVE_LOW; + else + common_flags &= ~V4L2_MBUS_DATA_ACTIVE_HIGH; + } + + cfg.flags = common_flags; + ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg); + if (ret < 0 && ret != -ENOIOCTLCMD) { + dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n", + common_flags, ret); + return ret; + } + + csicr1 = __raw_readl(pcdev->base + CSICR1); + + if (common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) + csicr1 |= CSICR1_REDGE; + if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) + csicr1 |= CSICR1_SOF_POL; + if (common_flags & V4L2_MBUS_DATA_ACTIVE_LOW) + csicr1 |= CSICR1_DATA_POL; + + __raw_writel(csicr1, pcdev->base + CSICR1); + + return 0; +} + +static int mx1_camera_set_fmt(struct soc_camera_device *icd, + struct v4l2_format *f) +{ + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + const struct soc_camera_format_xlate *xlate; + struct v4l2_pix_format *pix = &f->fmt.pix; + struct v4l2_mbus_framefmt mf; + int ret, buswidth; + + xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat); + if (!xlate) { + dev_warn(icd->parent, "Format %x not found\n", + pix->pixelformat); + return -EINVAL; + } + + buswidth = xlate->host_fmt->bits_per_sample; + if (buswidth > 8) { + dev_warn(icd->parent, + "bits-per-sample %d for format %x unsupported\n", + buswidth, pix->pixelformat); + return -EINVAL; + } + + mf.width = pix->width; + mf.height = pix->height; + mf.field = pix->field; + mf.colorspace = pix->colorspace; + mf.code = xlate->code; + + ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf); + if (ret < 0) + return ret; + + if (mf.code != xlate->code) + return -EINVAL; + + pix->width = mf.width; + pix->height = mf.height; + pix->field = mf.field; + pix->colorspace = mf.colorspace; + icd->current_fmt = xlate; + + return ret; +} + +static int mx1_camera_try_fmt(struct soc_camera_device *icd, + struct v4l2_format *f) +{ + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + const struct soc_camera_format_xlate *xlate; + struct v4l2_pix_format *pix = &f->fmt.pix; + struct v4l2_mbus_framefmt mf; + int ret; + /* TODO: limit to mx1 hardware capabilities */ + + xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat); + if (!xlate) { + dev_warn(icd->parent, "Format %x not found\n", + pix->pixelformat); + return -EINVAL; + } + + mf.width = pix->width; + mf.height = pix->height; + mf.field = pix->field; + mf.colorspace = pix->colorspace; + mf.code = xlate->code; + + /* limit to sensor capabilities */ + ret = v4l2_subdev_call(sd, 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; + + return 0; +} + +static int mx1_camera_reqbufs(struct soc_camera_device *icd, + 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 mx1_buffer *buf = container_of(icd->vb_vidq.bufs[i], + struct mx1_buffer, vb); + buf->inwork = 0; + INIT_LIST_HEAD(&buf->vb.queue); + } + + return 0; +} + +static unsigned int mx1_camera_poll(struct file *file, poll_table *pt) +{ + struct soc_camera_device *icd = file->private_data; + struct mx1_buffer *buf; + + buf = list_entry(icd->vb_vidq.stream.next, struct mx1_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 mx1_camera_querycap(struct soc_camera_host *ici, + struct v4l2_capability *cap) +{ + /* cap->name is set by the friendly caller:-> */ + strlcpy(cap->card, "i.MX1/i.MXL Camera", sizeof(cap->card)); + cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING; + + return 0; +} + +static struct soc_camera_host_ops mx1_soc_camera_host_ops = { + .owner = THIS_MODULE, + .add = mx1_camera_add_device, + .remove = mx1_camera_remove_device, + .set_bus_param = mx1_camera_set_bus_param, + .set_crop = mx1_camera_set_crop, + .set_fmt = mx1_camera_set_fmt, + .try_fmt = mx1_camera_try_fmt, + .init_videobuf = mx1_camera_init_videobuf, + .reqbufs = mx1_camera_reqbufs, + .poll = mx1_camera_poll, + .querycap = mx1_camera_querycap, +}; + +static struct fiq_handler fh = { + .name = "csi_sof" +}; + +static int __init mx1_camera_probe(struct platform_device *pdev) +{ + struct mx1_camera_dev *pcdev; + struct resource *res; + struct pt_regs regs; + struct clk *clk; + 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 || (int)irq <= 0) { + err = -ENODEV; + goto exit; + } + + clk = clk_get(&pdev->dev, "csi_clk"); + if (IS_ERR(clk)) { + err = PTR_ERR(clk); + goto exit; + } + + pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL); + if (!pcdev) { + dev_err(&pdev->dev, "Could not allocate pcdev\n"); + err = -ENOMEM; + goto exit_put_clk; + } + + pcdev->res = res; + pcdev->clk = clk; + + pcdev->pdata = pdev->dev.platform_data; + + if (pcdev->pdata) + pcdev->mclk = pcdev->pdata->mclk_10khz * 10000; + + if (!pcdev->mclk) { + dev_warn(&pdev->dev, + "mclk_10khz == 0! Please, fix your platform data. " + "Using default 20MHz\n"); + pcdev->mclk = 20000000; + } + + INIT_LIST_HEAD(&pcdev->capture); + spin_lock_init(&pcdev->lock); + + /* + * Request the regions. + */ + if (!request_mem_region(res->start, resource_size(res), DRIVER_NAME)) { + err = -EBUSY; + goto exit_kfree; + } + + base = ioremap(res->start, resource_size(res)); + if (!base) { + err = -ENOMEM; + goto exit_release; + } + pcdev->irq = irq; + pcdev->base = base; + + /* request dma */ + pcdev->dma_chan = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_HIGH); + if (pcdev->dma_chan < 0) { + dev_err(&pdev->dev, "Can't request DMA for MX1 CSI\n"); + err = -EBUSY; + goto exit_iounmap; + } + dev_dbg(&pdev->dev, "got DMA channel %d\n", pcdev->dma_chan); + + imx_dma_setup_handlers(pcdev->dma_chan, mx1_camera_dma_irq, NULL, + pcdev); + + imx_dma_config_channel(pcdev->dma_chan, IMX_DMA_TYPE_FIFO, + IMX_DMA_MEMSIZE_32, MX1_DMA_REQ_CSI_R, 0); + /* burst length : 16 words = 64 bytes */ + imx_dma_config_burstlen(pcdev->dma_chan, 0); + + /* request irq */ + err = claim_fiq(&fh); + if (err) { + dev_err(&pdev->dev, "Camera interrupt register failed \n"); + goto exit_free_dma; + } + + set_fiq_handler(&mx1_camera_sof_fiq_start, &mx1_camera_sof_fiq_end - + &mx1_camera_sof_fiq_start); + + regs.ARM_r8 = (long)MX1_DMA_DIMR; + regs.ARM_r9 = (long)MX1_DMA_CCR(pcdev->dma_chan); + regs.ARM_r10 = (long)pcdev->base + CSICR1; + regs.ARM_fp = (long)pcdev->base + CSISR; + regs.ARM_sp = 1 << pcdev->dma_chan; + set_fiq_regs(®s); + + mxc_set_irq_fiq(irq, 1); + enable_fiq(irq); + + pcdev->soc_host.drv_name = DRIVER_NAME; + pcdev->soc_host.ops = &mx1_soc_camera_host_ops; + pcdev->soc_host.priv = pcdev; + pcdev->soc_host.v4l2_dev.dev = &pdev->dev; + pcdev->soc_host.nr = pdev->id; + err = soc_camera_host_register(&pcdev->soc_host); + if (err) + goto exit_free_irq; + + dev_info(&pdev->dev, "MX1 Camera driver loaded\n"); + + return 0; + +exit_free_irq: + disable_fiq(irq); + mxc_set_irq_fiq(irq, 0); + release_fiq(&fh); +exit_free_dma: + imx_dma_free(pcdev->dma_chan); +exit_iounmap: + iounmap(base); +exit_release: + release_mem_region(res->start, resource_size(res)); +exit_kfree: + kfree(pcdev); +exit_put_clk: + clk_put(clk); +exit: + return err; +} + +static int __exit mx1_camera_remove(struct platform_device *pdev) +{ + struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev); + struct mx1_camera_dev *pcdev = container_of(soc_host, + struct mx1_camera_dev, soc_host); + struct resource *res; + + imx_dma_free(pcdev->dma_chan); + disable_fiq(pcdev->irq); + mxc_set_irq_fiq(pcdev->irq, 0); + release_fiq(&fh); + + clk_put(pcdev->clk); + + soc_camera_host_unregister(soc_host); + + iounmap(pcdev->base); + + res = pcdev->res; + release_mem_region(res->start, resource_size(res)); + + kfree(pcdev); + + dev_info(&pdev->dev, "MX1 Camera driver unloaded\n"); + + return 0; +} + +static struct platform_driver mx1_camera_driver = { + .driver = { + .name = DRIVER_NAME, + }, + .remove = __exit_p(mx1_camera_remove), +}; + +static int __init mx1_camera_init(void) +{ + return platform_driver_probe(&mx1_camera_driver, mx1_camera_probe); +} + +static void __exit mx1_camera_exit(void) +{ + return platform_driver_unregister(&mx1_camera_driver); +} + +module_init(mx1_camera_init); +module_exit(mx1_camera_exit); + +MODULE_DESCRIPTION("i.MX1/i.MXL SoC Camera Host driver"); +MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@teltonika.lt>"); +MODULE_LICENSE("GPL v2"); +MODULE_VERSION(DRIVER_VERSION); +MODULE_ALIAS("platform:" DRIVER_NAME); |