| Message ID | 49C9F62C.3000801@gmail.com (mailing list archive) |
|---|---|
| State | RFC |
| Headers | show |
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Hi Darius, I think Guennadi will have a closer look at the driver later. I looked only at the ARM part, so only some comments inline. Sascha > From: Paulius Zaleckas <paulius.zaleckas@teltonika.lt> > > Driver for i.MX1/L camera (CSI) host. > > Signed-off-by: Paulius Zaleckas <paulius.zaleckas@teltonika.lt> > --- > > Index: linux-2.6.29/drivers/media/video/imx_camera.c > =================================================================== > --- /dev/null > +++ linux-2.6.29/drivers/media/video/imx_camera.c > @@ -0,0 +1,872 @@ > +/* > + * V4L2 Driver for i.MX camera (CSI) host > + * > + * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt> > + * > + * 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 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/clk.h> > + > +#include <media/v4l2-common.h> > +#include <media/v4l2-dev.h> > +#include <media/videobuf-dma-contig.h> > +#include <media/soc_camera.h> > + > +#include <linux/videodev2.h> > + > +#include <asm/dma.h> > +#include <asm/fiq.h> > +#include <mach/hardware.h> > +#include <mach/dma-mx1-mx2.h> > +#include <mach/camera.h> > + > +/* > + * CSI registers > + */ > + > +#define DMA_DIMR 0x08 /* Interrupt mask Register */ > +#define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control 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_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 VERSION_CODE KERNEL_VERSION(0, 0, 1) > +#define DRIVER_NAME "imx-csi" > + > +#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 (SOCAM_MASTER | SOCAM_HSYNC_ACTIVE_HIGH | \ > + SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW | \ > + SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING | \ > + SOCAM_DATAWIDTH_8) > + > +static DEFINE_MUTEX(camera_lock); > + > +static int mclk; > + > +/* > + * Structures > + */ > + > +/* buffer for one video frame */ > +struct imx_buffer { > + /* common v4l buffer stuff -- must be first */ > + struct videobuf_buffer vb; > + > + const struct soc_camera_data_format *fmt; > + > + int inwork; > +}; > + > +struct imx_camera_dev { > + struct device *dev; > + /* i.MX 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 soc_camera_device *icd; > + > + unsigned int irq; > + void __iomem *base; > + > + int dma_chan; > + > + struct imxcamera_platform_data *pdata; > + struct resource *res; > + struct clk *clk; > + unsigned long platform_mclk_10khz; > + > + struct list_head capture; > + > + spinlock_t lock; > + > + struct imx_buffer *active; > +}; > + > +static const char *imx_cam_driver_description = "i.MX_Camera"; > + > +/* > + * Videobuf operations > + */ > +static int imx_videobuf_setup(struct videobuf_queue *vq, unsigned int *count, > + unsigned int *size) > +{ > + struct soc_camera_device *icd = vq->priv_data; > + > + *size = icd->width * icd->height * > + ((icd->current_fmt->depth + 7) >> 3); > + > + if (0 == *count) > + *count = 32; > + > + dev_dbg(&icd->dev, "count=%d, size=%d\n", *count, *size); > + > + return 0; > +} > + > +static void free_buffer(struct videobuf_queue *vq, struct imx_buffer *buf) > +{ > + struct soc_camera_device *icd = vq->priv_data; > + > + BUG_ON(in_interrupt()); > + > + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, > + &buf->vb, buf->vb.baddr, buf->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(&buf->vb, 0, 0); > + videobuf_dma_contig_free(vq, &buf->vb); > + > + buf->vb.state = VIDEOBUF_NEEDS_INIT; > +} > + > +static int imx_videobuf_prepare(struct videobuf_queue *vq, > + struct videobuf_buffer *vb, enum v4l2_field field) > +{ > + struct soc_camera_device *icd = vq->priv_data; > + struct imx_buffer *buf = container_of(vb, struct imx_buffer, vb); > + int ret; > + > + 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)); > + > + 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->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; > + } > + > + buf->inwork = 0; > + > + return 0; > + > +fail: > + free_buffer(vq, buf); > +out: > + buf->inwork = 0; > + return ret; > +} > + > +static int imx_camera_setup_dma(struct imx_camera_dev *pcdev) > +{ > + struct videobuf_buffer *vbuf = &pcdev->active->vb; > + int ret; > + > + if (unlikely(!pcdev->active)) { > + dev_err(pcdev->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(pcdev->dev, "Failed to setup DMA sg list\n"); > + > + return ret; > +} > + > +static void imx_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 imx_camera_dev *pcdev = ici->priv; > + struct imx_buffer *buf = container_of(vb, struct imx_buffer, vb); > + unsigned long flags; > + > + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, > + vb, vb->baddr, vb->bsize); > + spin_lock_irqsave(&pcdev->lock, flags); > + > + list_add_tail(&vb->queue, &pcdev->capture); > + > + vb->state = VIDEOBUF_ACTIVE; > + > + if (!pcdev->active) { > + pcdev->active = buf; > + > + /* setup sg list for future DMA */ > + if (!imx_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); > + } > + } > + > + spin_unlock_irqrestore(&pcdev->lock, flags); > +} > + > +static void imx_videobuf_release(struct videobuf_queue *vq, > + struct videobuf_buffer *vb) > +{ > + struct imx_buffer *buf = container_of(vb, struct imx_buffer, vb); > +#ifdef DEBUG > + struct soc_camera_device *icd = vq->priv_data; > + > + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, > + vb, vb->baddr, vb->bsize); > + > + switch (vb->state) { > + case VIDEOBUF_ACTIVE: > + dev_dbg(&icd->dev, "%s (active)\n", __func__); > + break; > + case VIDEOBUF_QUEUED: > + dev_dbg(&icd->dev, "%s (queued)\n", __func__); > + break; > + case VIDEOBUF_PREPARED: > + dev_dbg(&icd->dev, "%s (prepared)\n", __func__); > + break; > + default: > + dev_dbg(&icd->dev, "%s (unknown)\n", __func__); > + break; > + } > +#endif > + > + free_buffer(vq, buf); > +} > + > +static inline void imx_camera_wakeup(struct imx_camera_dev *pcdev, > + struct videobuf_buffer *vb, > + struct imx_buffer *buf) > +{ > + /* _init is used to debug races, see comment in imx_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 imx_buffer, vb.queue); > + > + /* setup sg list for future DMA */ > + if (likely(!imx_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 imx_camera_dma_irq(int channel, void *data) > +{ > + struct imx_camera_dev *pcdev = data; > + struct imx_buffer *buf; > + unsigned long flags; > + struct videobuf_buffer *vb; > + > + spin_lock_irqsave(&pcdev->lock, flags); > + > + imx_dma_disable(channel); > + > + if (unlikely(!pcdev->active)) { > + dev_err(pcdev->dev, "DMA End IRQ with no active buffer\n"); > + goto out; > + } > + > + vb = &pcdev->active->vb; > + buf = container_of(vb, struct imx_buffer, vb); > + WARN_ON(buf->inwork || list_empty(&vb->queue)); > + dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, > + vb, vb->baddr, vb->bsize); > + > + imx_camera_wakeup(pcdev, vb, buf); > + > +out: > + spin_unlock_irqrestore(&pcdev->lock, flags); > +} > + > +static struct videobuf_queue_ops imx_videobuf_ops = { > + .buf_setup = imx_videobuf_setup, > + .buf_prepare = imx_videobuf_prepare, > + .buf_queue = imx_videobuf_queue, > + .buf_release = imx_videobuf_release, > +}; > + > +static void imx_camera_init_videobuf(struct videobuf_queue *q, > + struct soc_camera_device *icd) > +{ > + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); > + struct imx_camera_dev *pcdev = ici->priv; > + > + videobuf_queue_dma_contig_init(q, &imx_videobuf_ops, pcdev->dev, > + &pcdev->lock, > + V4L2_BUF_TYPE_VIDEO_CAPTURE, > + V4L2_FIELD_NONE, > + sizeof(struct imx_buffer), icd); > +} > + > +static int mclk_get_divisor(struct imx_camera_dev *pcdev) > +{ > + unsigned int mclk_10khz = pcdev->platform_mclk_10khz; > + unsigned long div; > + unsigned long lcdclk; > + > + lcdclk = clk_get_rate(pcdev->clk) / 10000; > + > + /* We verify platform_mclk_10khz != 0, so if anyone breaks it, here > + * they get a nice Oops */ > + div = (lcdclk + 2 * mclk_10khz - 1) / (2 * mclk_10khz) - 1; > + > + dev_dbg(pcdev->dev, "System clock %lukHz, target freq %dkHz, " > + "divisor %lu\n", lcdclk * 10, mclk_10khz * 10, div); > + > + return div; > +} > + > +static void imx_camera_activate(struct imx_camera_dev *pcdev) > +{ > + struct imxcamera_platform_data *pdata = pcdev->pdata; > + unsigned int csicr1 = CSICR1_EN; > + > + dev_dbg(pcdev->dev, "Registered platform device at %p\n", > + pcdev); > + > + if (pdata && pdata->init) { > + dev_dbg(pcdev->dev, "%s: Init gpios\n", __func__); > + pdata->init(pcdev->dev); > + } > + > + if (pdata && pdata->power) { > + dev_dbg(pcdev->dev, "%s: Power on camera\n", __func__); > + pdata->power(pcdev->dev, 1); > + } > + > + 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); > + > + if (pdata && pdata->reset) { > + dev_dbg(pcdev->dev, "%s: Releasing camera reset\n", > + __func__); > + pdata->reset(pcdev->dev, 1); > + } > +} > + > +static void imx_camera_deactivate(struct imx_camera_dev *pcdev) > +{ > + struct imxcamera_platform_data *board = pcdev->pdata; > + > + /* Disable all CSI interface */ > + __raw_writel(0x00, pcdev->base + CSICR1); > + > + clk_disable(pcdev->clk); > + > + if (board && board->reset) { > + dev_dbg(pcdev->dev, "%s: Asserting camera reset\n", > + __func__); > + board->reset(pcdev->dev, 0); > + } > + > + if (board && board->power) { > + dev_dbg(pcdev->dev, "%s: Power off camera\n", __func__); > + board->power(pcdev->dev, 0); > + } > + > + if (board && board->exit) { > + dev_dbg(pcdev->dev, "%s: Release gpios\n", __func__); > + board->exit(pcdev->dev); > + } > +} > + > +/* The following two functions absolutely depend on the fact, that > + * there can be only one camera on i.MX camera sensor interface */ > +static int imx_camera_add_device(struct soc_camera_device *icd) > +{ > + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); > + struct imx_camera_dev *pcdev = ici->priv; > + int ret; > + > + mutex_lock(&camera_lock); > + > + if (pcdev->icd) { > + ret = -EBUSY; > + goto ebusy; > + } > + > + dev_info(&icd->dev, "i.MX Camera driver attached to camera %d\n", > + icd->devnum); > + > + imx_camera_activate(pcdev); > + ret = icd->ops->init(icd); > + > + if (!ret) > + pcdev->icd = icd; > + > +ebusy: > + mutex_unlock(&camera_lock); > + > + return ret; > +} > + > +static void imx_camera_remove_device(struct soc_camera_device *icd) > +{ > + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); > + struct imx_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->dev, "i.MX Camera driver detached from camera %d\n", > + icd->devnum); > + > + icd->ops->release(icd); > + > + imx_camera_deactivate(pcdev); > + > + pcdev->icd = NULL; > +} > + > +static int imx_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt) > +{ > + struct soc_camera_host *ici = > + to_soc_camera_host(icd->dev.parent); > + struct imx_camera_dev *pcdev = ici->priv; > + unsigned long camera_flags, common_flags; > + unsigned int csicr1; > + int ret; > + > + camera_flags = icd->ops->query_bus_param(icd); > + > + common_flags = soc_camera_bus_param_compatible(camera_flags, > + CSI_BUS_FLAGS); > + if (!common_flags) > + return -EINVAL; > + > + if (!(common_flags & SOCAM_DATAWIDTH_8)) { > + dev_warn(&icd->dev, "Camera sensor doesn't support 8-bit bus " > + "width\n"); > + /* set it so sensor set_bus_param could fail */ > + common_flags |= SOCAM_DATAWIDTH_8; > + } > + > + icd->buswidth = 8; > + > + /* Make choises, based on platform defaults */ > + if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) && > + (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) > + common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH; > + > + if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) && > + (common_flags & SOCAM_PCLK_SAMPLE_FALLING)) > + common_flags &= ~SOCAM_PCLK_SAMPLE_RISING; > + > + ret = icd->ops->set_bus_param(icd, common_flags); > + if (ret < 0) > + return ret; > + > + csicr1 = __raw_readl(pcdev->base + CSICR1); > + > + if (common_flags & SOCAM_PCLK_SAMPLE_RISING) > + csicr1 |= CSICR1_REDGE; > + if (common_flags & SOCAM_VSYNC_ACTIVE_HIGH) > + csicr1 |= CSICR1_SOF_POL; > + > + __raw_writel(csicr1, pcdev->base + CSICR1); > + > + return 0; > +} > + > +static int imx_camera_set_fmt(struct soc_camera_device *icd, > + __u32 pixfmt, struct v4l2_rect *rect) > +{ > + return icd->ops->set_fmt(icd, pixfmt, rect); > +} > + > +static int imx_camera_try_fmt(struct soc_camera_device *icd, > + struct v4l2_format *f) > +{ > + /* TODO: limit to imx hardware capabilities */ > + > + /* limit to sensor capabilities */ > + return icd->ops->try_fmt(icd, f); > +} > + > +static int imx_camera_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 imx_buffer *buf = container_of(icf->vb_vidq.bufs[i], > + struct imx_buffer, vb); > + buf->inwork = 0; > + INIT_LIST_HEAD(&buf->vb.queue); > + } > + > + return 0; > +} > + > +static unsigned int imx_camera_poll(struct file *file, poll_table *pt) > +{ > + struct soc_camera_file *icf = file->private_data; > + struct imx_buffer *buf; > + > + buf = list_entry(icf->vb_vidq.stream.next, struct imx_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 imx_camera_querycap(struct soc_camera_host *ici, > + struct v4l2_capability *cap) > +{ > + /* cap->name is set by the firendly caller:-> */ > + strlcpy(cap->card, imx_cam_driver_description, sizeof(cap->card)); > + cap->version = VERSION_CODE; > + cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING; > + > + return 0; > +} > + > +static struct soc_camera_host_ops imx_soc_camera_host_ops = { > + .owner = THIS_MODULE, > + .add = imx_camera_add_device, > + .remove = imx_camera_remove_device, > + .set_fmt = imx_camera_set_fmt, > + .try_fmt = imx_camera_try_fmt, > + .init_videobuf = imx_camera_init_videobuf, > + .reqbufs = imx_camera_reqbufs, > + .poll = imx_camera_poll, > + .querycap = imx_camera_querycap, > + .set_bus_param = imx_camera_set_bus_param, > +}; > + > +/* Should be allocated dynamically too, but we have only one. */ > +static struct soc_camera_host imx_soc_camera_host = { > + .drv_name = DRIVER_NAME, > + .ops = &imx_soc_camera_host_ops, > +}; > + > +static struct fiq_handler fh = { > + .name = "csi_sof" > +}; > + > +static int __init imx_camera_probe(struct platform_device *pdev) > +{ > + struct imx_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 || !irq) { > + 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; > + } > + > + dev_set_drvdata(&pdev->dev, pcdev); > + pcdev->res = res; > + pcdev->clk = clk; > + > + pcdev->pdata = pdev->dev.platform_data; > + > + if (pcdev->pdata) > + pcdev->platform_mclk_10khz = pcdev->pdata->mclk_10khz; > + else > + dev_warn(&pdev->dev, "No platform data provided!\n"); > + > + /* override if user entered mclk frequency as module param */ > + if (mclk) > + pcdev->platform_mclk_10khz = mclk / 10000; > + > + if (!pcdev->platform_mclk_10khz) { > + dev_warn(&pdev->dev, > + "mclk_10khz == 0! Please, fix your platform data. " > + "Using default 20MHz\n"); > + pcdev->platform_mclk_10khz = 2000; > + } > + > + INIT_LIST_HEAD(&pcdev->capture); > + spin_lock_init(&pcdev->lock); > + > + /* > + * Request the regions. > + */ > + if (!request_mem_region(res->start, res->end - res->start + 1, > + DRIVER_NAME)) { You already know what we're usually nagging about here. > + err = -EBUSY; > + goto exit_kfree; > + } > + > + base = ioremap(res->start, res->end - res->start + 1); and here > + if (!base) { > + err = -ENOMEM; > + goto exit_release; > + } > + pcdev->irq = irq; > + pcdev->base = base; > + pcdev->dev = &pdev->dev; > + > + /* request dma */ > + pcdev->dma_chan = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_HIGH); > + if (pcdev->dma_chan < 0) { > + dev_err(pcdev->dev, "Can't request DMA for i.MX CSI\n"); > + err = -ENOMEM; > + goto exit_iounmap; > + } > + dev_dbg(pcdev->dev, "got DMA channel %d\n", pcdev->dma_chan); > + > + imx_dma_setup_handlers(pcdev->dma_chan, imx_camera_dma_irq, NULL, > + pcdev); > + > + imx_dma_config_channel(pcdev->dma_chan, IMX_DMA_TYPE_FIFO, > + IMX_DMA_MEMSIZE_32, 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(pcdev->dev, "Camera interrupt register failed \n"); > + goto exit_free_dma; > + } > + > + set_fiq_handler(&imx_camera_sof_fiq_start, &imx_camera_sof_fiq_end - > + &imx_camera_sof_fiq_start); > + > + regs.ARM_r8 = DMA_BASE + DMA_DIMR; > + regs.ARM_r9 = DMA_BASE + 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); > + > + imx_soc_camera_host.priv = pcdev; > + imx_soc_camera_host.dev.parent = &pdev->dev; > + imx_soc_camera_host.nr = pdev->id; > + err = soc_camera_host_register(&imx_soc_camera_host); > + if (err) > + goto exit_free_irq; > + > + dev_info(&pdev->dev, "i.MX 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, res->end - res->start + 1); ditto > +exit_kfree: > + kfree(pcdev); > +exit: > + return err; > +} > + > +static int __exit imx_camera_remove(struct platform_device *pdev) > +{ > + struct imx_camera_dev *pcdev = platform_get_drvdata(pdev); > + struct resource *res; > + > + imx_dma_free(pcdev->dma_chan); > + disable_fiq(pcdev->irq); > + mxc_set_irq_fiq(pcdev->irq, 0); > + release_fiq(&fh); > + > + soc_camera_host_unregister(&imx_soc_camera_host); > + > + iounmap(pcdev->base); > + > + res = pcdev->res; > + release_mem_region(res->start, res->end - res->start + 1); > + > + kfree(pcdev); > + > + dev_info(&pdev->dev, "i.MX Camera driver unloaded\n"); > + > + return 0; > +} > + > +static int imx_camera_suspend(struct platform_device *pdev, pm_message_t state) > +{ > + struct imx_camera_dev *pcdev = platform_get_drvdata(pdev); > + struct imxcamera_platform_data *pdata = pcdev->pdata; > + > + if (pcdev->active) > + return -EBUSY; > + > + if (pdata && pdata->power) { > + dev_dbg(pcdev->dev, "%s: Power off camera\n", __func__); > + pdata->power(pcdev->dev, 0); > + } > + > + return 0; > +} > + > +static int imx_camera_resume(struct platform_device *pdev) > +{ > + struct imx_camera_dev *pcdev = platform_get_drvdata(pdev); > + struct imxcamera_platform_data *pdata = pcdev->pdata; > + > + if (pdata && pdata->power) { > + dev_dbg(pcdev->dev, "%s: Power on camera\n", __func__); > + pdata->power(pcdev->dev, 1); > + } > + > + return 0; > +} > + > +static struct platform_driver imx_camera_driver = { > + .driver = { > + .name = DRIVER_NAME, > + }, > + .remove = __exit_p(imx_camera_remove), > + .suspend = imx_camera_suspend, > + .resume = imx_camera_resume, > +}; > + > +static int __init imx_camera_init(void) > +{ > + return platform_driver_probe(&imx_camera_driver, imx_camera_probe); > +} > + > +static void __exit imx_camera_exit(void) > +{ > + return platform_driver_unregister(&imx_camera_driver); > +} > + > +module_init(imx_camera_init); > +module_exit(imx_camera_exit); > + > +MODULE_DESCRIPTION("i.MX SoC Camera Host driver"); > +MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@teltonika.lt>"); > +MODULE_LICENSE("GPL"); > +MODULE_ALIAS("platform:" DRIVER_NAME); > + > +module_param(mclk, int, 0); > +MODULE_PARM_DESC(mclk, "MCLK value in Hz"); > Index: linux-2.6.29/drivers/media/video/Kconfig > =================================================================== > --- linux-2.6.29.orig/drivers/media/video/Kconfig > +++ linux-2.6.29/drivers/media/video/Kconfig > @@ -929,4 +929,13 @@ config USB_S2255 > > endif # V4L_USB_DRIVERS > > +config VIDEO_IMX > + tristate "i.MX CMOS Sensor Interface driver" > + depends on VIDEO_DEV && ARCH_MX1 > + select FIQ > + select SOC_CAMERA > + select VIDEOBUF_DMA_CONTIG > + ---help--- > + This is a v4l2 driver for the i.MX CMOS Sensor Interface > + > endif # VIDEO_CAPTURE_DRIVERS > Index: linux-2.6.29/drivers/media/video/Makefile > =================================================================== > --- linux-2.6.29.orig/drivers/media/video/Makefile > +++ linux-2.6.29/drivers/media/video/Makefile > @@ -134,6 +134,7 @@ obj-$(CONFIG_VIDEO_CX18) += cx18/ > obj-$(CONFIG_VIDEO_VIVI) += vivi.o > obj-$(CONFIG_VIDEO_CX23885) += cx23885/ > > +obj-$(CONFIG_VIDEO_IMX) += imx_camera.o > obj-$(CONFIG_VIDEO_PXA27x) += pxa_camera.o > obj-$(CONFIG_VIDEO_SH_MOBILE_CEU) += sh_mobile_ceu_camera.o > obj-$(CONFIG_VIDEO_OMAP2) += omap2cam.o > Index: linux-2.6.29/arch/arm/mach-mx1/Makefile > =================================================================== > --- linux-2.6.29.orig/arch/arm/mach-mx1/Makefile > +++ linux-2.6.29/arch/arm/mach-mx1/Makefile > @@ -4,7 +4,7 @@ > > # Object file lists. > > -obj-y += generic.o clock.o devices.o > +obj-y += generic.o clock.o devices.o ksym_mx1.o > > # Power management > obj-$(CONFIG_PM) += pm.o > @@ -13,5 +13,10 @@ ifeq ($(CONFIG_PM_DEBUG),y) > CFLAGS_pm.o += -DDEBUG > endif > > +# Support for CMOS sensor interface > +ifdef CONFIG_VIDEO_IMX > +obj-y += imx_camera_fiq.o > +endif > + > # Specific board support > obj-$(CONFIG_ARCH_MX1ADS) += mx1ads.o > Index: linux-2.6.29/arch/arm/plat-mxc/include/mach/memory.h > =================================================================== > --- linux-2.6.29.orig/arch/arm/plat-mxc/include/mach/memory.h > +++ linux-2.6.29/arch/arm/plat-mxc/include/mach/memory.h > @@ -19,4 +19,12 @@ > #define PHYS_OFFSET UL(0x80000000) > #endif > > +#if defined(CONFIG_VIDEO_IMX) || defined(CONFIG_VIDEO_IMX_MODULE) > +/* > + * Increase size of DMA-consistent memory region. > + * This is required for i.MX camera driver to capture at least four VGA frames. > + */ > +#define CONSISTENT_DMA_SIZE SZ_8M > +#endif /* CONFIG_VIDEO_IMX */ > + > #endif /* __ASM_ARCH_MXC_MEMORY_H__ */ > Index: linux-2.6.29/arch/arm/plat-mxc/include/mach/camera.h As we will get a camera specific header for mx3 and maybe even mx2, please rename this to something like mx1-camera.h. > =================================================================== > --- /dev/null > +++ linux-2.6.29/arch/arm/plat-mxc/include/mach/camera.h > @@ -0,0 +1,27 @@ > +/* > + * camera.h - i.MX camera driver header file > + * > + * Copyright (c) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt> > + * > + * Based on PXA camera.h file: > + * Copyright (C) 2003, Intel Corporation > + * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de> > + * > + * This file is released under the GPLv2 > + */ > + > +#ifndef __ASM_ARCH_CAMERA_H_ > +#define __ASM_ARCH_CAMERA_H_ > + > +extern unsigned char imx_camera_sof_fiq_start, imx_camera_sof_fiq_end; > + > +struct imxcamera_platform_data { > + int (*init)(struct device *); > + int (*exit)(struct device *); > + int (*power)(struct device *, int); > + int (*reset)(struct device *, int); > + > + unsigned long mclk_10khz; > +}; > + > +#endif /* __ASM_ARCH_CAMERA_H_ */ > Index: linux-2.6.29/arch/arm/mach-mx1/imx_camera_fiq.S > =================================================================== > --- /dev/null > +++ linux-2.6.29/arch/arm/mach-mx1/imx_camera_fiq.S > @@ -0,0 +1,35 @@ > +/* > + * Copyright (C) 2008 Paulius Zaleckas <paulius.zaleckas@teltonika.lt> > + * > + * Based on linux/arch/arm/lib/floppydma.S > + * Copyright (C) 1995, 1996 Russell King > + * > + * 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/linkage.h> > +#include <asm/assembler.h> > + > + .text > + .global imx_camera_sof_fiq_end > + .global imx_camera_sof_fiq_start > +imx_camera_sof_fiq_start: > + @ enable dma > + ldr r12, [r9] > + orr r12, r12, #0x00000001 > + str r12, [r9] > + @ unmask DMA interrupt > + ldr r12, [r8] > + bic r12, r12, r13 > + str r12, [r8] > + @ disable SOF interrupt > + ldr r12, [r10] > + bic r12, r12, #0x00010000 > + str r12, [r10] > + @ clear SOF flag > + mov r12, #0x00010000 > + str r12, [r11] > + @ return from FIQ > + subs pc, lr, #4 > +imx_camera_sof_fiq_end: > Index: linux-2.6.29/arch/arm/mach-mx1/ksym_mx1.c > =================================================================== > --- /dev/null > +++ linux-2.6.29/arch/arm/mach-mx1/ksym_mx1.c > @@ -0,0 +1,23 @@ > +/* > + * Exported ksyms of ARCH_MX1 > + * > + * Copyright (C) 2008, Darius Augulis <augulis.darius@gmail.com> > + * > + * > + * 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/platform_device.h> > +#include <linux/module.h> > + > + > +#if defined(CONFIG_VIDEO_IMX) || defined(CONFIG_VIDEO_IMX_MODULE) > +#include <mach/camera.h> > + > +/* IMX camera FIQ handler */ > +EXPORT_SYMBOL(imx_camera_sof_fiq_start); > +EXPORT_SYMBOL(imx_camera_sof_fiq_end); > +#endif
Index: linux-2.6.29/drivers/media/video/imx_camera.c =================================================================== --- /dev/null +++ linux-2.6.29/drivers/media/video/imx_camera.c @@ -0,0 +1,872 @@ +/* + * V4L2 Driver for i.MX camera (CSI) host + * + * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt> + * + * 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 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/clk.h> + +#include <media/v4l2-common.h> +#include <media/v4l2-dev.h> +#include <media/videobuf-dma-contig.h> +#include <media/soc_camera.h> + +#include <linux/videodev2.h> + +#include <asm/dma.h> +#include <asm/fiq.h> +#include <mach/hardware.h> +#include <mach/dma-mx1-mx2.h> +#include <mach/camera.h> + +/* + * CSI registers + */ + +#define DMA_DIMR 0x08 /* Interrupt mask Register */ +#define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control 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_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 VERSION_CODE KERNEL_VERSION(0, 0, 1) +#define DRIVER_NAME "imx-csi" + +#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 (SOCAM_MASTER | SOCAM_HSYNC_ACTIVE_HIGH | \ + SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW | \ + SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING | \ + SOCAM_DATAWIDTH_8) + +static DEFINE_MUTEX(camera_lock); + +static int mclk; + +/* + * Structures + */ + +/* buffer for one video frame */ +struct imx_buffer { + /* common v4l buffer stuff -- must be first */ + struct videobuf_buffer vb; + + const struct soc_camera_data_format *fmt; + + int inwork; +}; + +struct imx_camera_dev { + struct device *dev; + /* i.MX 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 soc_camera_device *icd; + + unsigned int irq; + void __iomem *base; + + int dma_chan; + + struct imxcamera_platform_data *pdata; + struct resource *res; + struct clk *clk; + unsigned long platform_mclk_10khz; + + struct list_head capture; + + spinlock_t lock; + + struct imx_buffer *active; +}; + +static const char *imx_cam_driver_description = "i.MX_Camera"; + +/* + * Videobuf operations + */ +static int imx_videobuf_setup(struct videobuf_queue *vq, unsigned int *count, + unsigned int *size) +{ + struct soc_camera_device *icd = vq->priv_data; + + *size = icd->width * icd->height * + ((icd->current_fmt->depth + 7) >> 3); + + if (0 == *count) + *count = 32; + + dev_dbg(&icd->dev, "count=%d, size=%d\n", *count, *size); + + return 0; +} + +static void free_buffer(struct videobuf_queue *vq, struct imx_buffer *buf) +{ + struct soc_camera_device *icd = vq->priv_data; + + BUG_ON(in_interrupt()); + + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, + &buf->vb, buf->vb.baddr, buf->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(&buf->vb, 0, 0); + videobuf_dma_contig_free(vq, &buf->vb); + + buf->vb.state = VIDEOBUF_NEEDS_INIT; +} + +static int imx_videobuf_prepare(struct videobuf_queue *vq, + struct videobuf_buffer *vb, enum v4l2_field field) +{ + struct soc_camera_device *icd = vq->priv_data; + struct imx_buffer *buf = container_of(vb, struct imx_buffer, vb); + int ret; + + 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)); + + 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->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; + } + + buf->inwork = 0; + + return 0; + +fail: + free_buffer(vq, buf); +out: + buf->inwork = 0; + return ret; +} + +static int imx_camera_setup_dma(struct imx_camera_dev *pcdev) +{ + struct videobuf_buffer *vbuf = &pcdev->active->vb; + int ret; + + if (unlikely(!pcdev->active)) { + dev_err(pcdev->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(pcdev->dev, "Failed to setup DMA sg list\n"); + + return ret; +} + +static void imx_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 imx_camera_dev *pcdev = ici->priv; + struct imx_buffer *buf = container_of(vb, struct imx_buffer, vb); + unsigned long flags; + + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, + vb, vb->baddr, vb->bsize); + spin_lock_irqsave(&pcdev->lock, flags); + + list_add_tail(&vb->queue, &pcdev->capture); + + vb->state = VIDEOBUF_ACTIVE; + + if (!pcdev->active) { + pcdev->active = buf; + + /* setup sg list for future DMA */ + if (!imx_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); + } + } + + spin_unlock_irqrestore(&pcdev->lock, flags); +} + +static void imx_videobuf_release(struct videobuf_queue *vq, + struct videobuf_buffer *vb) +{ + struct imx_buffer *buf = container_of(vb, struct imx_buffer, vb); +#ifdef DEBUG + struct soc_camera_device *icd = vq->priv_data; + + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, + vb, vb->baddr, vb->bsize); + + switch (vb->state) { + case VIDEOBUF_ACTIVE: + dev_dbg(&icd->dev, "%s (active)\n", __func__); + break; + case VIDEOBUF_QUEUED: + dev_dbg(&icd->dev, "%s (queued)\n", __func__); + break; + case VIDEOBUF_PREPARED: + dev_dbg(&icd->dev, "%s (prepared)\n", __func__); + break; + default: + dev_dbg(&icd->dev, "%s (unknown)\n", __func__); + break; + } +#endif + + free_buffer(vq, buf); +} + +static inline void imx_camera_wakeup(struct imx_camera_dev *pcdev, + struct videobuf_buffer *vb, + struct imx_buffer *buf) +{ + /* _init is used to debug races, see comment in imx_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 imx_buffer, vb.queue); + + /* setup sg list for future DMA */ + if (likely(!imx_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 imx_camera_dma_irq(int channel, void *data) +{ + struct imx_camera_dev *pcdev = data; + struct imx_buffer *buf; + unsigned long flags; + struct videobuf_buffer *vb; + + spin_lock_irqsave(&pcdev->lock, flags); + + imx_dma_disable(channel); + + if (unlikely(!pcdev->active)) { + dev_err(pcdev->dev, "DMA End IRQ with no active buffer\n"); + goto out; + } + + vb = &pcdev->active->vb; + buf = container_of(vb, struct imx_buffer, vb); + WARN_ON(buf->inwork || list_empty(&vb->queue)); + dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, + vb, vb->baddr, vb->bsize); + + imx_camera_wakeup(pcdev, vb, buf); + +out: + spin_unlock_irqrestore(&pcdev->lock, flags); +} + +static struct videobuf_queue_ops imx_videobuf_ops = { + .buf_setup = imx_videobuf_setup, + .buf_prepare = imx_videobuf_prepare, + .buf_queue = imx_videobuf_queue, + .buf_release = imx_videobuf_release, +}; + +static void imx_camera_init_videobuf(struct videobuf_queue *q, + struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); + struct imx_camera_dev *pcdev = ici->priv; + + videobuf_queue_dma_contig_init(q, &imx_videobuf_ops, pcdev->dev, + &pcdev->lock, + V4L2_BUF_TYPE_VIDEO_CAPTURE, + V4L2_FIELD_NONE, + sizeof(struct imx_buffer), icd); +} + +static int mclk_get_divisor(struct imx_camera_dev *pcdev) +{ + unsigned int mclk_10khz = pcdev->platform_mclk_10khz; + unsigned long div; + unsigned long lcdclk; + + lcdclk = clk_get_rate(pcdev->clk) / 10000; + + /* We verify platform_mclk_10khz != 0, so if anyone breaks it, here + * they get a nice Oops */ + div = (lcdclk + 2 * mclk_10khz - 1) / (2 * mclk_10khz) - 1; + + dev_dbg(pcdev->dev, "System clock %lukHz, target freq %dkHz, " + "divisor %lu\n", lcdclk * 10, mclk_10khz * 10, div); + + return div; +} + +static void imx_camera_activate(struct imx_camera_dev *pcdev) +{ + struct imxcamera_platform_data *pdata = pcdev->pdata; + unsigned int csicr1 = CSICR1_EN; + + dev_dbg(pcdev->dev, "Registered platform device at %p\n", + pcdev); + + if (pdata && pdata->init) { + dev_dbg(pcdev->dev, "%s: Init gpios\n", __func__); + pdata->init(pcdev->dev); + } + + if (pdata && pdata->power) { + dev_dbg(pcdev->dev, "%s: Power on camera\n", __func__); + pdata->power(pcdev->dev, 1); + } + + 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); + + if (pdata && pdata->reset) { + dev_dbg(pcdev->dev, "%s: Releasing camera reset\n", + __func__); + pdata->reset(pcdev->dev, 1); + } +} + +static void imx_camera_deactivate(struct imx_camera_dev *pcdev) +{ + struct imxcamera_platform_data *board = pcdev->pdata; + + /* Disable all CSI interface */ + __raw_writel(0x00, pcdev->base + CSICR1); + + clk_disable(pcdev->clk); + + if (board && board->reset) { + dev_dbg(pcdev->dev, "%s: Asserting camera reset\n", + __func__); + board->reset(pcdev->dev, 0); + } + + if (board && board->power) { + dev_dbg(pcdev->dev, "%s: Power off camera\n", __func__); + board->power(pcdev->dev, 0); + } + + if (board && board->exit) { + dev_dbg(pcdev->dev, "%s: Release gpios\n", __func__); + board->exit(pcdev->dev); + } +} + +/* The following two functions absolutely depend on the fact, that + * there can be only one camera on i.MX camera sensor interface */ +static int imx_camera_add_device(struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); + struct imx_camera_dev *pcdev = ici->priv; + int ret; + + mutex_lock(&camera_lock); + + if (pcdev->icd) { + ret = -EBUSY; + goto ebusy; + } + + dev_info(&icd->dev, "i.MX Camera driver attached to camera %d\n", + icd->devnum); + + imx_camera_activate(pcdev); + ret = icd->ops->init(icd); + + if (!ret) + pcdev->icd = icd; + +ebusy: + mutex_unlock(&camera_lock); + + return ret; +} + +static void imx_camera_remove_device(struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); + struct imx_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->dev, "i.MX Camera driver detached from camera %d\n", + icd->devnum); + + icd->ops->release(icd); + + imx_camera_deactivate(pcdev); + + pcdev->icd = NULL; +} + +static int imx_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt) +{ + struct soc_camera_host *ici = + to_soc_camera_host(icd->dev.parent); + struct imx_camera_dev *pcdev = ici->priv; + unsigned long camera_flags, common_flags; + unsigned int csicr1; + int ret; + + camera_flags = icd->ops->query_bus_param(icd); + + common_flags = soc_camera_bus_param_compatible(camera_flags, + CSI_BUS_FLAGS); + if (!common_flags) + return -EINVAL; + + if (!(common_flags & SOCAM_DATAWIDTH_8)) { + dev_warn(&icd->dev, "Camera sensor doesn't support 8-bit bus " + "width\n"); + /* set it so sensor set_bus_param could fail */ + common_flags |= SOCAM_DATAWIDTH_8; + } + + icd->buswidth = 8; + + /* Make choises, based on platform defaults */ + if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) && + (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) + common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH; + + if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) && + (common_flags & SOCAM_PCLK_SAMPLE_FALLING)) + common_flags &= ~SOCAM_PCLK_SAMPLE_RISING; + + ret = icd->ops->set_bus_param(icd, common_flags); + if (ret < 0) + return ret; + + csicr1 = __raw_readl(pcdev->base + CSICR1); + + if (common_flags & SOCAM_PCLK_SAMPLE_RISING) + csicr1 |= CSICR1_REDGE; + if (common_flags & SOCAM_VSYNC_ACTIVE_HIGH) + csicr1 |= CSICR1_SOF_POL; + + __raw_writel(csicr1, pcdev->base + CSICR1); + + return 0; +} + +static int imx_camera_set_fmt(struct soc_camera_device *icd, + __u32 pixfmt, struct v4l2_rect *rect) +{ + return icd->ops->set_fmt(icd, pixfmt, rect); +} + +static int imx_camera_try_fmt(struct soc_camera_device *icd, + struct v4l2_format *f) +{ + /* TODO: limit to imx hardware capabilities */ + + /* limit to sensor capabilities */ + return icd->ops->try_fmt(icd, f); +} + +static int imx_camera_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 imx_buffer *buf = container_of(icf->vb_vidq.bufs[i], + struct imx_buffer, vb); + buf->inwork = 0; + INIT_LIST_HEAD(&buf->vb.queue); + } + + return 0; +} + +static unsigned int imx_camera_poll(struct file *file, poll_table *pt) +{ + struct soc_camera_file *icf = file->private_data; + struct imx_buffer *buf; + + buf = list_entry(icf->vb_vidq.stream.next, struct imx_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 imx_camera_querycap(struct soc_camera_host *ici, + struct v4l2_capability *cap) +{ + /* cap->name is set by the firendly caller:-> */ + strlcpy(cap->card, imx_cam_driver_description, sizeof(cap->card)); + cap->version = VERSION_CODE; + cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING; + + return 0; +} + +static struct soc_camera_host_ops imx_soc_camera_host_ops = { + .owner = THIS_MODULE, + .add = imx_camera_add_device, + .remove = imx_camera_remove_device, + .set_fmt = imx_camera_set_fmt, + .try_fmt = imx_camera_try_fmt, + .init_videobuf = imx_camera_init_videobuf, + .reqbufs = imx_camera_reqbufs, + .poll = imx_camera_poll, + .querycap = imx_camera_querycap, + .set_bus_param = imx_camera_set_bus_param, +}; + +/* Should be allocated dynamically too, but we have only one. */ +static struct soc_camera_host imx_soc_camera_host = { + .drv_name = DRIVER_NAME, + .ops = &imx_soc_camera_host_ops, +}; + +static struct fiq_handler fh = { + .name = "csi_sof" +}; + +static int __init imx_camera_probe(struct platform_device *pdev) +{ + struct imx_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 || !irq) { + 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; + } + + dev_set_drvdata(&pdev->dev, pcdev); + pcdev->res = res; + pcdev->clk = clk; + + pcdev->pdata = pdev->dev.platform_data; + + if (pcdev->pdata) + pcdev->platform_mclk_10khz = pcdev->pdata->mclk_10khz; + else + dev_warn(&pdev->dev, "No platform data provided!\n"); + + /* override if user entered mclk frequency as module param */ + if (mclk) + pcdev->platform_mclk_10khz = mclk / 10000; + + if (!pcdev->platform_mclk_10khz) { + dev_warn(&pdev->dev, + "mclk_10khz == 0! Please, fix your platform data. " + "Using default 20MHz\n"); + pcdev->platform_mclk_10khz = 2000; + } + + INIT_LIST_HEAD(&pcdev->capture); + spin_lock_init(&pcdev->lock); + + /* + * Request the regions. + */ + if (!request_mem_region(res->start, res->end - res->start + 1, + DRIVER_NAME)) { + err = -EBUSY; + goto exit_kfree; + } + + base = ioremap(res->start, res->end - res->start + 1); + if (!base) { + err = -ENOMEM; + goto exit_release; + } + pcdev->irq = irq; + pcdev->base = base; + pcdev->dev = &pdev->dev; + + /* request dma */ + pcdev->dma_chan = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_HIGH); + if (pcdev->dma_chan < 0) { + dev_err(pcdev->dev, "Can't request DMA for i.MX CSI\n"); + err = -ENOMEM; + goto exit_iounmap; + } + dev_dbg(pcdev->dev, "got DMA channel %d\n", pcdev->dma_chan); + + imx_dma_setup_handlers(pcdev->dma_chan, imx_camera_dma_irq, NULL, + pcdev); + + imx_dma_config_channel(pcdev->dma_chan, IMX_DMA_TYPE_FIFO, + IMX_DMA_MEMSIZE_32, 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(pcdev->dev, "Camera interrupt register failed \n"); + goto exit_free_dma; + } + + set_fiq_handler(&imx_camera_sof_fiq_start, &imx_camera_sof_fiq_end - + &imx_camera_sof_fiq_start); + + regs.ARM_r8 = DMA_BASE + DMA_DIMR; + regs.ARM_r9 = DMA_BASE + 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); + + imx_soc_camera_host.priv = pcdev; + imx_soc_camera_host.dev.parent = &pdev->dev; + imx_soc_camera_host.nr = pdev->id; + err = soc_camera_host_register(&imx_soc_camera_host); + if (err) + goto exit_free_irq; + + dev_info(&pdev->dev, "i.MX 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, res->end - res->start + 1); +exit_kfree: + kfree(pcdev); +exit: + return err; +} + +static int __exit imx_camera_remove(struct platform_device *pdev) +{ + struct imx_camera_dev *pcdev = platform_get_drvdata(pdev); + struct resource *res; + + imx_dma_free(pcdev->dma_chan); + disable_fiq(pcdev->irq); + mxc_set_irq_fiq(pcdev->irq, 0); + release_fiq(&fh); + + soc_camera_host_unregister(&imx_soc_camera_host); + + iounmap(pcdev->base); + + res = pcdev->res; + release_mem_region(res->start, res->end - res->start + 1); + + kfree(pcdev); + + dev_info(&pdev->dev, "i.MX Camera driver unloaded\n"); + + return 0; +} + +static int imx_camera_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct imx_camera_dev *pcdev = platform_get_drvdata(pdev); + struct imxcamera_platform_data *pdata = pcdev->pdata; + + if (pcdev->active) + return -EBUSY; + + if (pdata && pdata->power) { + dev_dbg(pcdev->dev, "%s: Power off camera\n", __func__); + pdata->power(pcdev->dev, 0); + } + + return 0; +} + +static int imx_camera_resume(struct platform_device *pdev) +{ + struct imx_camera_dev *pcdev = platform_get_drvdata(pdev); + struct imxcamera_platform_data *pdata = pcdev->pdata; + + if (pdata && pdata->power) { + dev_dbg(pcdev->dev, "%s: Power on camera\n", __func__); + pdata->power(pcdev->dev, 1); + } + + return 0; +} + +static struct platform_driver imx_camera_driver = { + .driver = { + .name = DRIVER_NAME, + }, + .remove = __exit_p(imx_camera_remove), + .suspend = imx_camera_suspend, + .resume = imx_camera_resume, +}; + +static int __init imx_camera_init(void) +{ + return platform_driver_probe(&imx_camera_driver, imx_camera_probe); +} + +static void __exit imx_camera_exit(void) +{ + return platform_driver_unregister(&imx_camera_driver); +} + +module_init(imx_camera_init); +module_exit(imx_camera_exit); + +MODULE_DESCRIPTION("i.MX SoC Camera Host driver"); +MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@teltonika.lt>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRIVER_NAME); + +module_param(mclk, int, 0); +MODULE_PARM_DESC(mclk, "MCLK value in Hz"); Index: linux-2.6.29/drivers/media/video/Kconfig =================================================================== --- linux-2.6.29.orig/drivers/media/video/Kconfig +++ linux-2.6.29/drivers/media/video/Kconfig @@ -929,4 +929,13 @@ config USB_S2255 endif # V4L_USB_DRIVERS +config VIDEO_IMX + tristate "i.MX CMOS Sensor Interface driver" + depends on VIDEO_DEV && ARCH_MX1 + select FIQ + select SOC_CAMERA + select VIDEOBUF_DMA_CONTIG + ---help--- + This is a v4l2 driver for the i.MX CMOS Sensor Interface + endif # VIDEO_CAPTURE_DRIVERS Index: linux-2.6.29/drivers/media/video/Makefile =================================================================== --- linux-2.6.29.orig/drivers/media/video/Makefile +++ linux-2.6.29/drivers/media/video/Makefile @@ -134,6 +134,7 @@ obj-$(CONFIG_VIDEO_CX18) += cx18/ obj-$(CONFIG_VIDEO_VIVI) += vivi.o obj-$(CONFIG_VIDEO_CX23885) += cx23885/ +obj-$(CONFIG_VIDEO_IMX) += imx_camera.o obj-$(CONFIG_VIDEO_PXA27x) += pxa_camera.o obj-$(CONFIG_VIDEO_SH_MOBILE_CEU) += sh_mobile_ceu_camera.o obj-$(CONFIG_VIDEO_OMAP2) += omap2cam.o Index: linux-2.6.29/arch/arm/mach-mx1/Makefile =================================================================== --- linux-2.6.29.orig/arch/arm/mach-mx1/Makefile +++ linux-2.6.29/arch/arm/mach-mx1/Makefile @@ -4,7 +4,7 @@ # Object file lists. -obj-y += generic.o clock.o devices.o +obj-y += generic.o clock.o devices.o ksym_mx1.o # Power management obj-$(CONFIG_PM) += pm.o @@ -13,5 +13,10 @@ ifeq ($(CONFIG_PM_DEBUG),y) CFLAGS_pm.o += -DDEBUG endif +# Support for CMOS sensor interface +ifdef CONFIG_VIDEO_IMX +obj-y += imx_camera_fiq.o +endif + # Specific board support obj-$(CONFIG_ARCH_MX1ADS) += mx1ads.o Index: linux-2.6.29/arch/arm/plat-mxc/include/mach/memory.h =================================================================== --- linux-2.6.29.orig/arch/arm/plat-mxc/include/mach/memory.h +++ linux-2.6.29/arch/arm/plat-mxc/include/mach/memory.h @@ -19,4 +19,12 @@ #define PHYS_OFFSET UL(0x80000000) #endif +#if defined(CONFIG_VIDEO_IMX) || defined(CONFIG_VIDEO_IMX_MODULE) +/* + * Increase size of DMA-consistent memory region. + * This is required for i.MX camera driver to capture at least four VGA frames. + */ +#define CONSISTENT_DMA_SIZE SZ_8M +#endif /* CONFIG_VIDEO_IMX */ + #endif /* __ASM_ARCH_MXC_MEMORY_H__ */ Index: linux-2.6.29/arch/arm/plat-mxc/include/mach/camera.h =================================================================== --- /dev/null +++ linux-2.6.29/arch/arm/plat-mxc/include/mach/camera.h @@ -0,0 +1,27 @@ +/* + * camera.h - i.MX camera driver header file + * + * Copyright (c) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt> + * + * Based on PXA camera.h file: + * Copyright (C) 2003, Intel Corporation + * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de> + * + * This file is released under the GPLv2 + */ + +#ifndef __ASM_ARCH_CAMERA_H_ +#define __ASM_ARCH_CAMERA_H_ + +extern unsigned char imx_camera_sof_fiq_start, imx_camera_sof_fiq_end; + +struct imxcamera_platform_data { + int (*init)(struct device *); + int (*exit)(struct device *); + int (*power)(struct device *, int); + int (*reset)(struct device *, int); + + unsigned long mclk_10khz; +}; + +#endif /* __ASM_ARCH_CAMERA_H_ */ Index: linux-2.6.29/arch/arm/mach-mx1/imx_camera_fiq.S =================================================================== --- /dev/null +++ linux-2.6.29/arch/arm/mach-mx1/imx_camera_fiq.S @@ -0,0 +1,35 @@ +/* + * Copyright (C) 2008 Paulius Zaleckas <paulius.zaleckas@teltonika.lt> + * + * Based on linux/arch/arm/lib/floppydma.S + * Copyright (C) 1995, 1996 Russell King + * + * 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/linkage.h> +#include <asm/assembler.h> + + .text + .global imx_camera_sof_fiq_end + .global imx_camera_sof_fiq_start +imx_camera_sof_fiq_start: + @ enable dma + ldr r12, [r9] + orr r12, r12, #0x00000001 + str r12, [r9] + @ unmask DMA interrupt + ldr r12, [r8] + bic r12, r12, r13 + str r12, [r8] + @ disable SOF interrupt + ldr r12, [r10] + bic r12, r12, #0x00010000 + str r12, [r10] + @ clear SOF flag + mov r12, #0x00010000 + str r12, [r11] + @ return from FIQ + subs pc, lr, #4 +imx_camera_sof_fiq_end: Index: linux-2.6.29/arch/arm/mach-mx1/ksym_mx1.c =================================================================== --- /dev/null +++ linux-2.6.29/arch/arm/mach-mx1/ksym_mx1.c @@ -0,0 +1,23 @@ +/* + * Exported ksyms of ARCH_MX1 + * + * Copyright (C) 2008, Darius Augulis <augulis.darius@gmail.com> + * + * + * 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/platform_device.h> +#include <linux/module.h> + + +#if defined(CONFIG_VIDEO_IMX) || defined(CONFIG_VIDEO_IMX_MODULE) +#include <mach/camera.h> + +/* IMX camera FIQ handler */ +EXPORT_SYMBOL(imx_camera_sof_fiq_start); +EXPORT_SYMBOL(imx_camera_sof_fiq_end); +#endif