/* * 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_SIM_MP (0 << 24) #define CICR0_SIM_SP (1 << 24) #define CICR0_SIM_MS (2 << 24) #define CICR0_SIM_EP (3 << 24) #define CICR0_SIM_ES (4 << 24) #define CICR1_DW_VAL(x) ((x) & CICR1_DW) /* Data bus width */ #define CICR1_PPL_VAL(x) (((x) << 15) & CICR1_PPL) /* Pixels per line */ #define CICR2_BLW_VAL(x) (((x) << 24) & CICR2_BLW) /* Beginning-of-line pixel clock wait count */ #define CICR2_ELW_VAL(x) (((x) << 16) & CICR2_ELW) /* End-of-line pixel clock wait count */ #define CICR2_HSW_VAL(x) (((x) << 10) & CICR2_HSW) /* Horizontal sync pulse width */ #define CICR2_BFPW_VAL(x) (((x) << 3) & CICR2_BFPW) /* Beginning-of-frame pixel clock wait count */ #define CICR2_FSW_VAL(x) (((x) << 0) & CICR2_FSW) /* Frame stabilization wait count */ #define CICR3_BFW_VAL(x) (((x) << 24) & CICR3_BFW) /* Beginning-of-frame line clock wait count */ #define CICR3_EFW_VAL(x) (((x) << 16) & CICR3_EFW) /* End-of-frame line clock wait count */ #define CICR3_VSW_VAL(x) (((x) << 11) & CICR3_VSW) /* Vertical sync pulse width */ #define CICR3_LPF_VAL(x) (((x) << 0) & CICR3_LPF) /* Lines per frame */ #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; struct pxacamera_platform_data *pdata; struct resource *res; unsigned long platform_flags; unsigned long platform_mclk_10khz; struct list_head capture; spinlock_t lock; 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", __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_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", __func__, vb, vb->baddr, vb->bsize); /* Added list head initialization on alloc */ WARN_ON(!list_empty(&vb->queue)); #ifdef DEBUG /* This can be useful if you want to see if we actually fill * the buffer with something */ memset((void *)vb->baddr, 0xaa, vb->bsize); #endif BUG_ON(NULL == icd->current_fmt); /* 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; 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", __func__, vb, vb->baddr, vb->bsize); spin_lock_irqsave(&pcdev->lock, flags); list_add_tail(&vb->queue, &pcdev->capture); vb->state = VIDEOBUF_ACTIVE; active = pcdev->active; if (!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", __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 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); DCSR(pcdev->dma_chan_y) = status; if (status & DCSR_BUSERR) { dev_err(pcdev->dev, "DMA Bus Error IRQ!\n"); goto out; } if (!(status & DCSR_ENDINTR)) { dev_err(pcdev->dev, "Unknown DMA IRQ source, " "status: 0x%08x\n", status); goto out; } if (!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 pxa_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); /* _init is used to debug races, see comment in pxa_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; 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_videobuf_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_camera_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", __func__); pdata->init(pcdev->dev); } if (pdata && pdata->power) { dev_dbg(pcdev->dev, "%s: Power on camera\n", __func__); pdata->power(pcdev->dev, 1); } if (pdata && pdata->reset) { dev_dbg(pcdev->dev, "%s: Releasing camera reset\n", __func__); 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_camera_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", __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); } } 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_camera_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_camera_activate(pcdev); ret = icd->ops->init(icd); if (!ret) pcdev->icd = icd; ebusy: mutex_unlock(&camera_lock); return ret; } static void pxa_camera_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_camera_deactivate(pcdev); pcdev->icd = NULL; } static int test_platform_param(struct pxa_camera_dev *pcdev, unsigned char buswidth, unsigned long *flags) { /* * Platform specified synchronization and pixel clock polarities are * only a recommendation and are only used during probing. The PXA270 * quick capture interface supports both. */ *flags = (pcdev->platform_flags & PXA_CAMERA_MASTER ? SOCAM_MASTER : SOCAM_SLAVE) | SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW | SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW | SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING; /* If requested data width is supported by the platform, use it */ switch (buswidth) { case 10: if (!(pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_10)) return -EINVAL; *flags |= SOCAM_DATAWIDTH_10; break; case 9: if (!(pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_9)) return -EINVAL; *flags |= SOCAM_DATAWIDTH_9; break; case 8: if (!(pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_8)) return -EINVAL; *flags |= SOCAM_DATAWIDTH_8; } return 0; } static int pxa_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt) { struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); struct pxa_camera_dev *pcdev = ici->priv; unsigned long dw, bpp, bus_flags, camera_flags, common_flags; u32 cicr0, cicr4 = 0; int ret = test_platform_param(pcdev, icd->buswidth, &bus_flags); if (ret < 0) return ret; camera_flags = icd->ops->query_bus_param(icd); common_flags = soc_camera_bus_param_compatible(camera_flags, bus_flags); if (!common_flags) return -EINVAL; /* Make choises, based on platform preferences */ if ((common_flags & SOCAM_HSYNC_ACTIVE_HIGH) && (common_flags & SOCAM_HSYNC_ACTIVE_LOW)) { if (pcdev->platform_flags & PXA_CAMERA_HSP) common_flags &= ~SOCAM_HSYNC_ACTIVE_HIGH; else common_flags &= ~SOCAM_HSYNC_ACTIVE_LOW; } if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) && (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) { if (pcdev->platform_flags & PXA_CAMERA_VSP) common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH; else common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW; } if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) && (common_flags & SOCAM_PCLK_SAMPLE_FALLING)) { if (pcdev->platform_flags & PXA_CAMERA_PCP) common_flags &= ~SOCAM_PCLK_SAMPLE_RISING; else common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING; } ret = icd->ops->set_bus_param(icd, common_flags); 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 (common_flags & SOCAM_DATAWIDTH_MASK) { case SOCAM_DATAWIDTH_10: icd->buswidth = 10; dw = 4; bpp = 0x40; break; case SOCAM_DATAWIDTH_9: icd->buswidth = 9; dw = 3; bpp = 0x20; break; default: /* Actually it can only be 8 now, * default is just to silence compiler warnings */ case SOCAM_DATAWIDTH_8: icd->buswidth = 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 (common_flags & SOCAM_PCLK_SAMPLE_FALLING) cicr4 |= CICR4_PCP; if (common_flags & SOCAM_HSYNC_ACTIVE_LOW) cicr4 |= CICR4_HSP; if (common_flags & SOCAM_VSYNC_ACTIVE_LOW) cicr4 |= CICR4_VSP; cicr0 = CICR0; if (cicr0 & CICR0_ENB) CICR0 = cicr0 & ~CICR0_ENB; CICR1 = CICR1_PPL_VAL(icd->width - 1) | bpp | dw; CICR2 = 0; CICR3 = CICR3_LPF_VAL(icd->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 ? CICR0_SIM_MP : (CICR0_SL_CAP_EN | CICR0_SIM_SP)) | CICR0_DMAEN | CICR0_IRQ_MASK | (cicr0 & CICR0_ENB); return 0; } static int pxa_camera_try_bus_param(struct soc_camera_device *icd, __u32 pixfmt) { struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); struct pxa_camera_dev *pcdev = ici->priv; unsigned long bus_flags, camera_flags; int ret = test_platform_param(pcdev, icd->buswidth, &bus_flags); if (ret < 0) return ret; camera_flags = icd->ops->query_bus_param(icd); return soc_camera_bus_param_compatible(camera_flags, bus_flags) ? 0 : -EINVAL; } static int pxa_camera_set_fmt_cap(struct soc_camera_device *icd, __u32 pixfmt, struct v4l2_rect *rect) { return icd->ops->set_fmt_cap(icd, pixfmt, rect); } static int pxa_camera_try_fmt_cap(struct soc_camera_device *icd, 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; /* limit to sensor capabilities */ return icd->ops->try_fmt_cap(icd, f); } static int pxa_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 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_camera_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_camera_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; } static spinlock_t *pxa_camera_spinlock_alloc(struct soc_camera_file *icf) { struct soc_camera_host *ici = to_soc_camera_host(icf->icd->dev.parent); struct pxa_camera_dev *pcdev = ici->priv; return &pcdev->lock; } static struct soc_camera_host_ops pxa_soc_camera_host_ops = { .owner = THIS_MODULE, .add = pxa_camera_add_device, .remove = pxa_camera_remove_device, .set_fmt_cap = pxa_camera_set_fmt_cap, .try_fmt_cap = pxa_camera_try_fmt_cap, .reqbufs = pxa_camera_reqbufs, .poll = pxa_camera_poll, .querycap = pxa_camera_querycap, .try_bus_param = pxa_camera_try_bus_param, .set_bus_param = pxa_camera_set_bus_param, .spinlock_alloc = pxa_camera_spinlock_alloc, }; /* Should be allocated 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_videobuf_ops, .msize = sizeof(struct pxa_buffer), .ops = &pxa_soc_camera_host_ops, }; 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, "Could not allocate pcdev\n"); 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); 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, "PXA Camera driver unloaded\n"); 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), }; 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");