From 3bc43840c3fbffaf8216883a37b336a41050d7f7 Mon Sep 17 00:00:00 2001 From: Guennadi Liakhovetski Date: Sun, 6 Apr 2008 21:24:56 -0300 Subject: [PATCH] V4L/DVB (7578a): V4L: V4L2 soc_camera driver for PXA270 This patch adds a driver for the Quick Capture Interface on the PXA270. It is based on the original driver from Intel, but has been re-worked multiple times since then, now it also supports the V4L2 API. This patch depends on a complementary patch, submitted to the ARM tree, providing PXA270 camera platform bindings. Signed-off-by: Guennadi Liakhovetski Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/Kconfig | 7 + drivers/media/video/Makefile | 1 + drivers/media/video/pxa_camera.c | 937 +++++++++++++++++++++++++++++++ 3 files changed, 945 insertions(+) create mode 100644 drivers/media/video/pxa_camera.c diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig index 5d3fbd969b6..fb4bf089c68 100644 --- a/drivers/media/video/Kconfig +++ b/drivers/media/video/Kconfig @@ -845,4 +845,11 @@ config SOC_CAMERA over a bus like PCI or USB. For example some i2c camera connected directly to the data bus of an SoC. +config VIDEO_PXA27x + tristate "PXA27x Quick Capture Interface driver" + depends on VIDEO_DEV && PXA27x + select SOC_CAMERA + ---help--- + This is a v4l2 driver for the PXA27x Quick Capture Interface + endif # VIDEO_CAPTURE_DRIVERS diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile index cf5e990a47b..874ed967f41 100644 --- a/drivers/media/video/Makefile +++ b/drivers/media/video/Makefile @@ -136,6 +136,7 @@ obj-$(CONFIG_VIDEO_IVTV) += ivtv/ obj-$(CONFIG_VIDEO_VIVI) += vivi.o obj-$(CONFIG_VIDEO_CX23885) += cx23885/ +obj-$(CONFIG_VIDEO_PXA27x) += pxa_camera.o obj-$(CONFIG_SOC_CAMERA) += soc_camera.o EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core diff --git a/drivers/media/video/pxa_camera.c b/drivers/media/video/pxa_camera.c new file mode 100644 index 00000000000..11aecad769c --- /dev/null +++ b/drivers/media/video/pxa_camera.c @@ -0,0 +1,937 @@ +/* + * V4L2 Driver for PXA camera host + * + * Copyright (C) 2006, Sascha Hauer, Pengutronix + * Copyright (C) 2008, Guennadi Liakhovetski + * + * 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 + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include + +#include +#include +#include + +#define PXA_CAM_VERSION_CODE KERNEL_VERSION(0, 0, 5) +#define PXA_CAM_DRV_NAME "pxa27x-camera" + +#define CICR0_IRQ_MASK (CICR0_TOM | CICR0_RDAVM | CICR0_FEM | CICR0_EOLM | \ + CICR0_PERRM | CICR0_QDM | CICR0_CDM | CICR0_SOFM | \ + CICR0_EOFM | CICR0_FOM) + +static DEFINE_MUTEX(camera_lock); + +/* + * Structures + */ + +/* buffer for one video frame */ +struct pxa_buffer { + /* common v4l buffer stuff -- must be first */ + struct videobuf_buffer vb; + + const struct soc_camera_data_format *fmt; + + /* our descriptor list needed for the PXA DMA engine */ + dma_addr_t sg_dma; + struct pxa_dma_desc *sg_cpu; + size_t sg_size; + int inwork; +}; + +struct pxa_framebuffer_queue { + dma_addr_t sg_last_dma; + struct pxa_dma_desc *sg_last_cpu; +}; + +struct pxa_camera_dev { + struct device *dev; + /* PXA27x is only supposed to handle one camera on its Quick Capture + * 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; + struct clk *clk; + + unsigned int irq; + void __iomem *base; + unsigned int dma_chan_y; + + enum v4l2_buf_type type; + + struct pxacamera_platform_data *pdata; + struct resource *res; + unsigned long platform_flags; + unsigned long platform_mclk_10khz; + + struct list_head capture; + + spinlock_t lock; + + int dma_running; + + struct pxa_buffer *active; +}; + +static const char *pxa_cam_driver_description = "PXA_Camera"; + +static unsigned int vid_limit = 16; /* Video memory limit, in Mb */ + +/* + * Videobuf operations + */ +static int +pxa_videobuf_setup(struct videobuf_queue *vq, unsigned int *count, + unsigned int *size) +{ + struct soc_camera_device *icd = vq->priv_data; + + dev_dbg(&icd->dev, "count=%d, size=%d\n", *count, *size); + + *size = icd->width * icd->height * ((icd->current_fmt->depth + 7) >> 3); + + if (0 == *count) + *count = 32; + while (*size * *count > vid_limit * 1024 * 1024) + (*count)--; + + return 0; +} + +static void free_buffer(struct videobuf_queue *vq, struct pxa_buffer *buf) +{ + struct soc_camera_device *icd = vq->priv_data; + struct soc_camera_host *ici = + to_soc_camera_host(icd->dev.parent); + struct pxa_camera_dev *pcdev = ici->priv; + struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb); + + BUG_ON(in_interrupt()); + + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __FUNCTION__, + &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_unmap(vq, dma); + videobuf_dma_free(dma); + + if (buf->sg_cpu) + dma_free_coherent(pcdev->dev, buf->sg_size, buf->sg_cpu, + buf->sg_dma); + buf->sg_cpu = NULL; + + buf->vb.state = VIDEOBUF_NEEDS_INIT; +} + +static int +pxa_videobuf_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb, + enum v4l2_field field) +{ + struct soc_camera_device *icd = vq->priv_data; + struct soc_camera_host *ici = + to_soc_camera_host(icd->dev.parent); + struct pxa_camera_dev *pcdev = ici->priv; + struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb); + int i, ret; + + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __FUNCTION__, + 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); + + /* 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) { + unsigned int size = vb->size; + struct videobuf_dmabuf *dma = videobuf_to_dma(vb); + + ret = videobuf_iolock(vq, vb, NULL); + if (ret) + goto fail; + + if (buf->sg_cpu) + dma_free_coherent(pcdev->dev, buf->sg_size, buf->sg_cpu, + buf->sg_dma); + + buf->sg_size = (dma->sglen + 1) * sizeof(struct pxa_dma_desc); + buf->sg_cpu = dma_alloc_coherent(pcdev->dev, buf->sg_size, + &buf->sg_dma, GFP_KERNEL); + if (!buf->sg_cpu) { + ret = -ENOMEM; + goto fail; + } + + dev_dbg(&icd->dev, "nents=%d size: %d sg=0x%p\n", + dma->sglen, size, dma->sglist); + for (i = 0; i < dma->sglen; i++) { + struct scatterlist *sg = dma->sglist; + unsigned int dma_len = sg_dma_len(&sg[i]), xfer_len; + + /* CIBR0 */ + buf->sg_cpu[i].dsadr = pcdev->res->start + 0x28; + buf->sg_cpu[i].dtadr = sg_dma_address(&sg[i]); + /* PXA270 Developer's Manual 27.4.4.1: + * round up to 8 bytes */ + xfer_len = (min(dma_len, size) + 7) & ~7; + if (xfer_len & 7) + dev_err(&icd->dev, "Unaligned buffer: " + "dma_len %u, size %u\n", dma_len, size); + buf->sg_cpu[i].dcmd = DCMD_FLOWSRC | DCMD_BURST8 | + DCMD_INCTRGADDR | xfer_len; + size -= dma_len; + buf->sg_cpu[i].ddadr = buf->sg_dma + (i + 1) * + sizeof(struct pxa_dma_desc); + } + buf->sg_cpu[dma->sglen - 1].ddadr = DDADR_STOP; + buf->sg_cpu[dma->sglen - 1].dcmd |= DCMD_ENDIRQEN; + + vb->state = VIDEOBUF_PREPARED; + } + + buf->inwork = 0; + + return 0; + +fail: + free_buffer(vq, buf); +out: + buf->inwork = 0; + return ret; +} + +static void +pxa_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 pxa_camera_dev *pcdev = ici->priv; + struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb); + struct pxa_buffer *active = pcdev->active; + struct videobuf_dmabuf *dma = videobuf_to_dma(vb); + int nents = dma->sglen; + unsigned long flags; + + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __FUNCTION__, + 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) { + CIFR |= CIFR_RESET_F; + DDADR(pcdev->dma_chan_y) = buf->sg_dma; + DCSR(pcdev->dma_chan_y) = DCSR_RUN; + pcdev->active = buf; + CICR0 |= CICR0_ENB; + } else { + struct videobuf_dmabuf *active_dma = + videobuf_to_dma(&active->vb); + /* Stop DMA engine */ + DCSR(pcdev->dma_chan_y) = 0; + + /* Add the descriptors we just initialized to the currently + * running chain + */ + active->sg_cpu[active_dma->sglen - 1].ddadr = buf->sg_dma; + + /* Setup a dummy descriptor with the DMA engines current + * state + */ + /* CIBR0 */ + buf->sg_cpu[nents].dsadr = pcdev->res->start + 0x28; + buf->sg_cpu[nents].dtadr = DTADR(pcdev->dma_chan_y); + buf->sg_cpu[nents].dcmd = DCMD(pcdev->dma_chan_y); + + if (DDADR(pcdev->dma_chan_y) == DDADR_STOP) { + /* The DMA engine is on the last descriptor, set the + * next descriptors address to the descriptors + * we just initialized + */ + buf->sg_cpu[nents].ddadr = buf->sg_dma; + } else { + buf->sg_cpu[nents].ddadr = DDADR(pcdev->dma_chan_y); + } + + /* The next descriptor is the dummy descriptor */ + DDADR(pcdev->dma_chan_y) = buf->sg_dma + nents * + sizeof(struct pxa_dma_desc); + +#ifdef DEBUG + if (CISR & CISR_IFO_0) { + dev_warn(pcdev->dev, "FIFO overrun\n"); + DDADR(pcdev->dma_chan_y) = pcdev->active->sg_dma; + + CICR0 &= ~CICR0_ENB; + CIFR |= CIFR_RESET_F; + DCSR(pcdev->dma_chan_y) = DCSR_RUN; + CICR0 |= CICR0_ENB; + } else +#endif + DCSR(pcdev->dma_chan_y) = DCSR_RUN; + } + + spin_unlock_irqrestore(&pcdev->lock, flags); + +} + +static void pxa_videobuf_release(struct videobuf_queue *vq, + struct videobuf_buffer *vb) +{ + struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb); +#ifdef DEBUG + struct soc_camera_device *icd = vq->priv_data; + + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __FUNCTION__, + vb, vb->baddr, vb->bsize); + + switch (vb->state) { + case VIDEOBUF_ACTIVE: + dev_dbg(&icd->dev, "%s (active)\n", __FUNCTION__); + break; + case VIDEOBUF_QUEUED: + dev_dbg(&icd->dev, "%s (queued)\n", __FUNCTION__); + break; + case VIDEOBUF_PREPARED: + dev_dbg(&icd->dev, "%s (prepared)\n", __FUNCTION__); + break; + default: + dev_dbg(&icd->dev, "%s (unknown)\n", __FUNCTION__); + break; + } +#endif + + free_buffer(vq, buf); +} + +static void pxa_camera_dma_irq_y(int channel, void *data) +{ + struct pxa_camera_dev *pcdev = data; + struct pxa_buffer *buf; + unsigned long flags; + unsigned int status; + struct videobuf_buffer *vb; + + spin_lock_irqsave(&pcdev->lock, flags); + + status = DCSR(pcdev->dma_chan_y); + if (status & DCSR_BUSERR) { + dev_err(pcdev->dev, "%s: Bus Error\n", __FUNCTION__); + DCSR(pcdev->dma_chan_y) |= DCSR_BUSERR; + goto out; + } + + if (!(status & DCSR_ENDINTR)) { + dev_err(pcdev->dev, "%s: unknown dma interrupt source. " + "status: 0x%08x\n", __FUNCTION__, status); + goto out; + } + + DCSR(pcdev->dma_chan_y) |= DCSR_ENDINTR; + + if (!pcdev->active) { + dev_err(pcdev->dev, "%s: no active buf\n", __FUNCTION__); + goto out; + } + + vb = &pcdev->active->vb; + buf = container_of(vb, struct pxa_buffer, vb); + WARN_ON(buf->inwork || list_empty(&vb->queue)); + dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __FUNCTION__, + vb, vb->baddr, vb->bsize); + + /* _init is used to debug races, see comment in pxa_is_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; + DCSR(pcdev->dma_chan_y) = 0; + CICR0 &= ~CICR0_ENB; + goto out; + } + + pcdev->active = list_entry(pcdev->capture.next, struct pxa_buffer, + vb.queue); + +out: + spin_unlock_irqrestore(&pcdev->lock, flags); +} + +static struct videobuf_queue_ops pxa_video_ops = { + .buf_setup = pxa_videobuf_setup, + .buf_prepare = pxa_videobuf_prepare, + .buf_queue = pxa_videobuf_queue, + .buf_release = pxa_videobuf_release, +}; + +static int mclk_get_divisor(struct pxa_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, "LCD clock %lukHz, target freq %dkHz, " + "divisor %lu\n", lcdclk * 10, mclk_10khz * 10, div); + + return div; +} + +static void pxa_is_activate(struct pxa_camera_dev *pcdev) +{ + struct pxacamera_platform_data *pdata = pcdev->pdata; + u32 cicr4 = 0; + + dev_dbg(pcdev->dev, "Registered platform device at %p data %p\n", + pcdev, pdata); + + if (pdata && pdata->init) { + dev_dbg(pcdev->dev, "%s: Init gpios\n", __FUNCTION__); + pdata->init(pcdev->dev); + } + + if (pdata && pdata->power) { + dev_dbg(pcdev->dev, "%s: Power on camera\n", __FUNCTION__); + pdata->power(pcdev->dev, 1); + } + + if (pdata && pdata->reset) { + dev_dbg(pcdev->dev, "%s: Releasing camera reset\n", + __FUNCTION__); + pdata->reset(pcdev->dev, 1); + } + + CICR0 = 0x3FF; /* disable all interrupts */ + + if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN) + cicr4 |= CICR4_PCLK_EN; + if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN) + cicr4 |= CICR4_MCLK_EN; + if (pcdev->platform_flags & PXA_CAMERA_PCP) + cicr4 |= CICR4_PCP; + if (pcdev->platform_flags & PXA_CAMERA_HSP) + cicr4 |= CICR4_HSP; + if (pcdev->platform_flags & PXA_CAMERA_VSP) + cicr4 |= CICR4_VSP; + + CICR4 = mclk_get_divisor(pcdev) | cicr4; + + clk_enable(pcdev->clk); +} + +static void pxa_is_deactivate(struct pxa_camera_dev *pcdev) +{ + struct pxacamera_platform_data *board = pcdev->pdata; + + clk_disable(pcdev->clk); + + if (board && board->reset) { + dev_dbg(pcdev->dev, "%s: Asserting camera reset\n", + __FUNCTION__); + board->reset(pcdev->dev, 0); + } + + if (board && board->power) { + dev_dbg(pcdev->dev, "%s: Power off camera\n", __FUNCTION__); + board->power(pcdev->dev, 0); + } +} + +static irqreturn_t pxa_camera_irq(int irq, void *data) +{ + struct pxa_camera_dev *pcdev = data; + unsigned int status = CISR; + + dev_dbg(pcdev->dev, "Camera interrupt status 0x%x\n", status); + + CISR = status; + + return IRQ_HANDLED; +} + +/* The following two functions absolutely depend on the fact, that + * there can be only one camera on PXA quick capture interface */ +static int pxa_is_add_device(struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); + struct pxa_camera_dev *pcdev = ici->priv; + int ret; + + mutex_lock(&camera_lock); + + if (pcdev->icd) { + ret = -EBUSY; + goto ebusy; + } + + dev_info(&icd->dev, "PXA Camera driver attached to camera %d\n", + icd->devnum); + + pxa_is_activate(pcdev); + ret = icd->ops->init(icd); + + if (!ret) + pcdev->icd = icd; + +ebusy: + mutex_unlock(&camera_lock); + + return ret; +} + +static void pxa_is_remove_device(struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); + struct pxa_camera_dev *pcdev = ici->priv; + + BUG_ON(icd != pcdev->icd); + + dev_info(&icd->dev, "PXA Camera driver detached from camera %d\n", + icd->devnum); + + /* disable capture, disable interrupts */ + CICR0 = 0x3ff; + /* Stop DMA engine */ + DCSR(pcdev->dma_chan_y) = 0; + + icd->ops->release(icd); + + pxa_is_deactivate(pcdev); + + pcdev->icd = NULL; +} + +static int pxa_is_set_capture_format(struct soc_camera_device *icd, + __u32 pixfmt, struct v4l2_rect *rect) +{ + struct soc_camera_host *ici = + to_soc_camera_host(icd->dev.parent); + struct pxa_camera_dev *pcdev = ici->priv; + unsigned int datawidth = 0, dw, bpp; + u32 cicr0, cicr4 = 0; + int ret; + + /* If requested data width is supported by the platform, use it */ + switch (icd->cached_datawidth) { + case 10: + if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_10) + datawidth = IS_DATAWIDTH_10; + break; + case 9: + if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_9) + datawidth = IS_DATAWIDTH_9; + break; + case 8: + if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_8) + datawidth = IS_DATAWIDTH_8; + } + if (!datawidth) + return -EINVAL; + + ret = icd->ops->set_capture_format(icd, pixfmt, rect, + datawidth | + (pcdev->platform_flags & PXA_CAMERA_MASTER ? + IS_MASTER : 0) | + (pcdev->platform_flags & PXA_CAMERA_HSP ? + 0 : IS_HSYNC_ACTIVE_HIGH) | + (pcdev->platform_flags & PXA_CAMERA_VSP ? + 0 : IS_VSYNC_ACTIVE_HIGH) | + (pcdev->platform_flags & PXA_CAMERA_PCP ? + 0 : IS_PCLK_SAMPLE_RISING)); + if (ret < 0) + return ret; + + /* Datawidth is now guaranteed to be equal to one of the three values. + * We fix bit-per-pixel equal to data-width... */ + switch (datawidth) { + case IS_DATAWIDTH_10: + icd->cached_datawidth = 10; + dw = 4; + bpp = 0x40; + break; + case IS_DATAWIDTH_9: + icd->cached_datawidth = 9; + dw = 3; + bpp = 0x20; + break; + default: + /* Actually it can only be 8 now, + * default is just to silence compiler warnings */ + case IS_DATAWIDTH_8: + icd->cached_datawidth = 8; + dw = 2; + bpp = 0; + } + + if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN) + cicr4 |= CICR4_PCLK_EN; + if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN) + cicr4 |= CICR4_MCLK_EN; + if (pcdev->platform_flags & PXA_CAMERA_PCP) + cicr4 |= CICR4_PCP; + if (pcdev->platform_flags & PXA_CAMERA_HSP) + cicr4 |= CICR4_HSP; + if (pcdev->platform_flags & PXA_CAMERA_VSP) + cicr4 |= CICR4_VSP; + + cicr0 = CICR0; + if (cicr0 & CICR0_ENB) + CICR0 = cicr0 & ~CICR0_ENB; + CICR1 = CICR1_PPL_VAL(rect->width - 1) | bpp | dw; + CICR2 = 0; + CICR3 = CICR3_LPF_VAL(rect->height - 1) | + CICR3_BFW_VAL(min((unsigned short)255, icd->y_skip_top)); + CICR4 = mclk_get_divisor(pcdev) | cicr4; + + /* CIF interrupts are not used, only DMA */ + CICR0 = (pcdev->platform_flags & PXA_CAMERA_MASTER ? + 0 : (CICR0_SL_CAP_EN | CICR0_SIM_SP)) | + CICR0_DMAEN | CICR0_IRQ_MASK | (cicr0 & CICR0_ENB); + + return 0; +} + +static int pxa_is_try_fmt_cap(struct soc_camera_host *ici, + struct v4l2_format *f) +{ + /* limit to pxa hardware capabilities */ + if (f->fmt.pix.height < 32) + f->fmt.pix.height = 32; + if (f->fmt.pix.height > 2048) + f->fmt.pix.height = 2048; + if (f->fmt.pix.width < 48) + f->fmt.pix.width = 48; + if (f->fmt.pix.width > 2048) + f->fmt.pix.width = 2048; + f->fmt.pix.width &= ~0x01; + + return 0; +} + +static int pxa_is_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 pxa_buffer *buf = container_of(icf->vb_vidq.bufs[i], + struct pxa_buffer, vb); + buf->inwork = 0; + INIT_LIST_HEAD(&buf->vb.queue); + } + + return 0; +} + +static unsigned int pxa_is_poll(struct file *file, poll_table *pt) +{ + struct soc_camera_file *icf = file->private_data; + struct pxa_buffer *buf; + + buf = list_entry(icf->vb_vidq.stream.next, struct pxa_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 pxa_is_querycap(struct soc_camera_host *ici, + struct v4l2_capability *cap) +{ + /* cap->name is set by the firendly caller:-> */ + strlcpy(cap->card, pxa_cam_driver_description, sizeof(cap->card)); + cap->version = PXA_CAM_VERSION_CODE; + cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING; + + return 0; +} + +/* Should beallocated dynamically too, but we have only one. */ +static struct soc_camera_host pxa_soc_camera_host = { + .drv_name = PXA_CAM_DRV_NAME, + .vbq_ops = &pxa_video_ops, + .add = pxa_is_add_device, + .remove = pxa_is_remove_device, + .msize = sizeof(struct pxa_buffer), + .set_capture_format = pxa_is_set_capture_format, + .try_fmt_cap = pxa_is_try_fmt_cap, + .reqbufs = pxa_is_reqbufs, + .poll = pxa_is_poll, + .querycap = pxa_is_querycap, +}; + +static int pxa_camera_probe(struct platform_device *pdev) +{ + struct pxa_camera_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) { + err = -ENODEV; + goto exit; + } + + pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL); + if (!pcdev) { + dev_err(&pdev->dev, "%s: Could not allocate pcdev\n", + __FUNCTION__); + err = -ENOMEM; + goto exit; + } + + pcdev->clk = clk_get(&pdev->dev, "CAMCLK"); + if (IS_ERR(pcdev->clk)) { + err = PTR_ERR(pcdev->clk); + goto exit_kfree; + } + + dev_set_drvdata(&pdev->dev, pcdev); + pcdev->res = res; + + pcdev->pdata = pdev->dev.platform_data; + pcdev->platform_flags = pcdev->pdata->flags; + if (!pcdev->platform_flags & (PXA_CAMERA_DATAWIDTH_8 | + PXA_CAMERA_DATAWIDTH_9 | PXA_CAMERA_DATAWIDTH_10)) { + /* Platform hasn't set available data widths. This is bad. + * Warn and use a default. */ + dev_warn(&pdev->dev, "WARNING! Platform hasn't set available " + "data widths, using default 10 bit\n"); + pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_10; + } + pcdev->platform_mclk_10khz = pcdev->pdata->mclk_10khz; + 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, + PXA_CAM_DRV_NAME)) { + err = -EBUSY; + goto exit_clk; + } + + 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_y = pxa_request_dma("CI_Y", DMA_PRIO_HIGH, + pxa_camera_dma_irq_y, pcdev); + if (pcdev->dma_chan_y < 0) { + dev_err(pcdev->dev, "Can't request DMA for Y\n"); + err = -ENOMEM; + goto exit_iounmap; + } + dev_dbg(pcdev->dev, "got DMA channel %d\n", pcdev->dma_chan_y); + + DRCMR68 = pcdev->dma_chan_y | DRCMR_MAPVLD; + + /* request irq */ + err = request_irq(pcdev->irq, pxa_camera_irq, 0, PXA_CAM_DRV_NAME, + pcdev); + if (err) { + dev_err(pcdev->dev, "Camera interrupt register failed \n"); + goto exit_free_dma; + } + + pxa_soc_camera_host.priv = pcdev; + pxa_soc_camera_host.dev.parent = &pdev->dev; + pxa_soc_camera_host.nr = pdev->id; + err = soc_camera_host_register(&pxa_soc_camera_host, THIS_MODULE); + if (err) + goto exit_free_irq; + + return 0; + +exit_free_irq: + free_irq(pcdev->irq, pcdev); +exit_free_dma: + pxa_free_dma(pcdev->dma_chan_y); +exit_iounmap: + iounmap(base); +exit_release: + release_mem_region(res->start, res->end - res->start + 1); +exit_clk: + clk_put(pcdev->clk); +exit_kfree: + kfree(pcdev); +exit: + return err; +} + +static int __devexit pxa_camera_remove(struct platform_device *pdev) +{ + struct pxa_camera_dev *pcdev = platform_get_drvdata(pdev); + struct resource *res; + + clk_put(pcdev->clk); + + pxa_free_dma(pcdev->dma_chan_y); + free_irq(pcdev->irq, pcdev); + + soc_camera_host_unregister(&pxa_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, "%s: PXA Camera driver unloaded\n", __FUNCTION__); + + return 0; +} + +/* + * Suspend the Camera Module. + */ +static int pxa_camera_suspend(struct platform_device *pdev, pm_message_t level) +{ + struct pxa_camera_dev *pcdev = platform_get_drvdata(pdev); + + dev_info(&pdev->dev, "camera suspend\n"); + disable_irq(pcdev->irq); + return 0; +} + +/* + * Resume the Camera Module. + */ +static int pxa_camera_resume(struct platform_device *pdev) +{ + struct pxa_camera_dev *pcdev = platform_get_drvdata(pdev); + + dev_info(&pdev->dev, "camera resume\n"); + enable_irq(pcdev->irq); + +/* if (pcdev) { */ /* FIXME: dev in use? */ +/* DRCMR68 = pcdev->dma_chan_y | DRCMR_MAPVLD; */ +/* DRCMR69 = pcdev->dma_chan_cb | DRCMR_MAPVLD; */ +/* DRCMR70 = pcdev->dma_chan_cr | DRCMR_MAPVLD; */ +/* } */ + + return 0; +} + + +static struct platform_driver pxa_camera_driver = { + .driver = { + .name = PXA_CAM_DRV_NAME, + }, + .probe = pxa_camera_probe, + .remove = __exit_p(pxa_camera_remove), + .suspend = pxa_camera_suspend, + .resume = pxa_camera_resume, +}; + + +static int __devinit pxa_camera_init(void) +{ + return platform_driver_register(&pxa_camera_driver); +} + +static void __exit pxa_camera_exit(void) +{ + return platform_driver_unregister(&pxa_camera_driver); +} + +module_init(pxa_camera_init); +module_exit(pxa_camera_exit); + +MODULE_DESCRIPTION("PXA27x SoC Camera Host driver"); +MODULE_AUTHOR("Guennadi Liakhovetski "); +MODULE_LICENSE("GPL"); -- 2.20.1