diff options
Diffstat (limited to 'drivers/media/platform/pxa_camera.c')
| -rw-r--r-- | drivers/media/platform/pxa_camera.c | 1852 |
1 files changed, 1852 insertions, 0 deletions
diff --git a/drivers/media/platform/pxa_camera.c b/drivers/media/platform/pxa_camera.c new file mode 100644 index 000000000000..9c21e01f2c24 --- /dev/null +++ b/drivers/media/platform/pxa_camera.c @@ -0,0 +1,1852 @@ +/* + * V4L2 Driver for PXA camera host + * + * 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/device.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/sched.h> +#include <linux/slab.h> + +#include <media/v4l2-common.h> +#include <media/v4l2-dev.h> +#include <media/videobuf-dma-sg.h> +#include <media/soc_camera.h> +#include <media/soc_mediabus.h> + +#include <linux/videodev2.h> + +#include <mach/dma.h> +#include <mach/camera.h> + +#define PXA_CAM_VERSION "0.0.6" +#define PXA_CAM_DRV_NAME "pxa27x-camera" + +/* Camera Interface */ +#define CICR0 0x0000 +#define CICR1 0x0004 +#define CICR2 0x0008 +#define CICR3 0x000C +#define CICR4 0x0010 +#define CISR 0x0014 +#define CIFR 0x0018 +#define CITOR 0x001C +#define CIBR0 0x0028 +#define CIBR1 0x0030 +#define CIBR2 0x0038 + +#define CICR0_DMAEN (1 << 31) /* DMA request enable */ +#define CICR0_PAR_EN (1 << 30) /* Parity enable */ +#define CICR0_SL_CAP_EN (1 << 29) /* Capture enable for slave mode */ +#define CICR0_ENB (1 << 28) /* Camera interface enable */ +#define CICR0_DIS (1 << 27) /* Camera interface disable */ +#define CICR0_SIM (0x7 << 24) /* Sensor interface mode mask */ +#define CICR0_TOM (1 << 9) /* Time-out mask */ +#define CICR0_RDAVM (1 << 8) /* Receive-data-available mask */ +#define CICR0_FEM (1 << 7) /* FIFO-empty mask */ +#define CICR0_EOLM (1 << 6) /* End-of-line mask */ +#define CICR0_PERRM (1 << 5) /* Parity-error mask */ +#define CICR0_QDM (1 << 4) /* Quick-disable mask */ +#define CICR0_CDM (1 << 3) /* Disable-done mask */ +#define CICR0_SOFM (1 << 2) /* Start-of-frame mask */ +#define CICR0_EOFM (1 << 1) /* End-of-frame mask */ +#define CICR0_FOM (1 << 0) /* FIFO-overrun mask */ + +#define CICR1_TBIT (1 << 31) /* Transparency bit */ +#define CICR1_RGBT_CONV (0x3 << 29) /* RGBT conversion mask */ +#define CICR1_PPL (0x7ff << 15) /* Pixels per line mask */ +#define CICR1_RGB_CONV (0x7 << 12) /* RGB conversion mask */ +#define CICR1_RGB_F (1 << 11) /* RGB format */ +#define CICR1_YCBCR_F (1 << 10) /* YCbCr format */ +#define CICR1_RGB_BPP (0x7 << 7) /* RGB bis per pixel mask */ +#define CICR1_RAW_BPP (0x3 << 5) /* Raw bis per pixel mask */ +#define CICR1_COLOR_SP (0x3 << 3) /* Color space mask */ +#define CICR1_DW (0x7 << 0) /* Data width mask */ + +#define CICR2_BLW (0xff << 24) /* Beginning-of-line pixel clock + wait count mask */ +#define CICR2_ELW (0xff << 16) /* End-of-line pixel clock + wait count mask */ +#define CICR2_HSW (0x3f << 10) /* Horizontal sync pulse width mask */ +#define CICR2_BFPW (0x3f << 3) /* Beginning-of-frame pixel clock + wait count mask */ +#define CICR2_FSW (0x7 << 0) /* Frame stabilization + wait count mask */ + +#define CICR3_BFW (0xff << 24) /* Beginning-of-frame line clock + wait count mask */ +#define CICR3_EFW (0xff << 16) /* End-of-frame line clock + wait count mask */ +#define CICR3_VSW (0x3f << 10) /* Vertical sync pulse width mask */ +#define CICR3_BFPW (0x3f << 3) /* Beginning-of-frame pixel clock + wait count mask */ +#define CICR3_LPF (0x7ff << 0) /* Lines per frame mask */ + +#define CICR4_MCLK_DLY (0x3 << 24) /* MCLK Data Capture Delay mask */ +#define CICR4_PCLK_EN (1 << 23) /* Pixel clock enable */ +#define CICR4_PCP (1 << 22) /* Pixel clock polarity */ +#define CICR4_HSP (1 << 21) /* Horizontal sync polarity */ +#define CICR4_VSP (1 << 20) /* Vertical sync polarity */ +#define CICR4_MCLK_EN (1 << 19) /* MCLK enable */ +#define CICR4_FR_RATE (0x7 << 8) /* Frame rate mask */ +#define CICR4_DIV (0xff << 0) /* Clock divisor mask */ + +#define CISR_FTO (1 << 15) /* FIFO time-out */ +#define CISR_RDAV_2 (1 << 14) /* Channel 2 receive data available */ +#define CISR_RDAV_1 (1 << 13) /* Channel 1 receive data available */ +#define CISR_RDAV_0 (1 << 12) /* Channel 0 receive data available */ +#define CISR_FEMPTY_2 (1 << 11) /* Channel 2 FIFO empty */ +#define CISR_FEMPTY_1 (1 << 10) /* Channel 1 FIFO empty */ +#define CISR_FEMPTY_0 (1 << 9) /* Channel 0 FIFO empty */ +#define CISR_EOL (1 << 8) /* End of line */ +#define CISR_PAR_ERR (1 << 7) /* Parity error */ +#define CISR_CQD (1 << 6) /* Camera interface quick disable */ +#define CISR_CDD (1 << 5) /* Camera interface disable done */ +#define CISR_SOF (1 << 4) /* Start of frame */ +#define CISR_EOF (1 << 3) /* End of frame */ +#define CISR_IFO_2 (1 << 2) /* FIFO overrun for Channel 2 */ +#define CISR_IFO_1 (1 << 1) /* FIFO overrun for Channel 1 */ +#define CISR_IFO_0 (1 << 0) /* FIFO overrun for Channel 0 */ + +#define CIFR_FLVL2 (0x7f << 23) /* FIFO 2 level mask */ +#define CIFR_FLVL1 (0x7f << 16) /* FIFO 1 level mask */ +#define CIFR_FLVL0 (0xff << 8) /* FIFO 0 level mask */ +#define CIFR_THL_0 (0x3 << 4) /* Threshold Level for Channel 0 FIFO */ +#define CIFR_RESET_F (1 << 3) /* Reset input FIFOs */ +#define CIFR_FEN2 (1 << 2) /* FIFO enable for channel 2 */ +#define CIFR_FEN1 (1 << 1) /* FIFO enable for channel 1 */ +#define CIFR_FEN0 (1 << 0) /* FIFO enable for channel 0 */ + +#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 CICR1_COLOR_SP_VAL(x) (((x) << 3) & CICR1_COLOR_SP) /* color space */ +#define CICR1_RGB_BPP_VAL(x) (((x) << 7) & CICR1_RGB_BPP) /* bpp for rgb */ +#define CICR1_RGBT_CONV_VAL(x) (((x) << 29) & CICR1_RGBT_CONV) /* rgbt conv */ + +#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) + +/* + * Structures + */ +enum pxa_camera_active_dma { + DMA_Y = 0x1, + DMA_U = 0x2, + DMA_V = 0x4, +}; + +/* descriptor needed for the PXA DMA engine */ +struct pxa_cam_dma { + dma_addr_t sg_dma; + struct pxa_dma_desc *sg_cpu; + size_t sg_size; + int sglen; +}; + +/* buffer for one video frame */ +struct pxa_buffer { + /* common v4l buffer stuff -- must be first */ + struct videobuf_buffer vb; + enum v4l2_mbus_pixelcode code; + /* our descriptor lists for Y, U and V channels */ + struct pxa_cam_dma dmas[3]; + int inwork; + enum pxa_camera_active_dma active_dma; +}; + +struct pxa_camera_dev { + struct soc_camera_host soc_host; + /* + * 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; + + int channels; + unsigned int dma_chans[3]; + + struct pxacamera_platform_data *pdata; + struct resource *res; + unsigned long platform_flags; + unsigned long ciclk; + unsigned long mclk; + u32 mclk_divisor; + u16 width_flags; /* max 10 bits */ + + struct list_head capture; + + spinlock_t lock; + + struct pxa_buffer *active; + struct pxa_dma_desc *sg_tail[3]; + + u32 save_cicr[5]; +}; + +struct pxa_cam { + unsigned long flags; +}; + +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->parent, "count=%d, size=%d\n", *count, *size); + + *size = icd->sizeimage; + + if (0 == *count) + *count = 32; + if (*size * *count > vid_limit * 1024 * 1024) + *count = (vid_limit * 1024 * 1024) / *size; + + 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->parent); + struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb); + int i; + + BUG_ON(in_interrupt()); + + dev_dbg(icd->parent, "%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(vq, &buf->vb, 0, 0); + videobuf_dma_unmap(vq->dev, dma); + videobuf_dma_free(dma); + + for (i = 0; i < ARRAY_SIZE(buf->dmas); i++) { + if (buf->dmas[i].sg_cpu) + dma_free_coherent(ici->v4l2_dev.dev, + buf->dmas[i].sg_size, + buf->dmas[i].sg_cpu, + buf->dmas[i].sg_dma); + buf->dmas[i].sg_cpu = NULL; + } + + buf->vb.state = VIDEOBUF_NEEDS_INIT; +} + +static int calculate_dma_sglen(struct scatterlist *sglist, int sglen, + int sg_first_ofs, int size) +{ + int i, offset, dma_len, xfer_len; + struct scatterlist *sg; + + offset = sg_first_ofs; + for_each_sg(sglist, sg, sglen, i) { + dma_len = sg_dma_len(sg); + + /* PXA27x Developer's Manual 27.4.4.1: round up to 8 bytes */ + xfer_len = roundup(min(dma_len - offset, size), 8); + + size = max(0, size - xfer_len); + offset = 0; + if (size == 0) + break; + } + + BUG_ON(size != 0); + return i + 1; +} + +/** + * pxa_init_dma_channel - init dma descriptors + * @pcdev: pxa camera device + * @buf: pxa buffer to find pxa dma channel + * @dma: dma video buffer + * @channel: dma channel (0 => 'Y', 1 => 'U', 2 => 'V') + * @cibr: camera Receive Buffer Register + * @size: bytes to transfer + * @sg_first: first element of sg_list + * @sg_first_ofs: offset in first element of sg_list + * + * Prepares the pxa dma descriptors to transfer one camera channel. + * Beware sg_first and sg_first_ofs are both input and output parameters. + * + * Returns 0 or -ENOMEM if no coherent memory is available + */ +static int pxa_init_dma_channel(struct pxa_camera_dev *pcdev, + struct pxa_buffer *buf, + struct videobuf_dmabuf *dma, int channel, + int cibr, int size, + struct scatterlist **sg_first, int *sg_first_ofs) +{ + struct pxa_cam_dma *pxa_dma = &buf->dmas[channel]; + struct device *dev = pcdev->soc_host.v4l2_dev.dev; + struct scatterlist *sg; + int i, offset, sglen; + int dma_len = 0, xfer_len = 0; + + if (pxa_dma->sg_cpu) + dma_free_coherent(dev, pxa_dma->sg_size, + pxa_dma->sg_cpu, pxa_dma->sg_dma); + + sglen = calculate_dma_sglen(*sg_first, dma->sglen, + *sg_first_ofs, size); + + pxa_dma->sg_size = (sglen + 1) * sizeof(struct pxa_dma_desc); + pxa_dma->sg_cpu = dma_alloc_coherent(dev, pxa_dma->sg_size, + &pxa_dma->sg_dma, GFP_KERNEL); + if (!pxa_dma->sg_cpu) + return -ENOMEM; + + pxa_dma->sglen = sglen; + offset = *sg_first_ofs; + + dev_dbg(dev, "DMA: sg_first=%p, sglen=%d, ofs=%d, dma.desc=%x\n", + *sg_first, sglen, *sg_first_ofs, pxa_dma->sg_dma); + + + for_each_sg(*sg_first, sg, sglen, i) { + dma_len = sg_dma_len(sg); + + /* PXA27x Developer's Manual 27.4.4.1: round up to 8 bytes */ + xfer_len = roundup(min(dma_len - offset, size), 8); + + size = max(0, size - xfer_len); + + pxa_dma->sg_cpu[i].dsadr = pcdev->res->start + cibr; + pxa_dma->sg_cpu[i].dtadr = sg_dma_address(sg) + offset; + pxa_dma->sg_cpu[i].dcmd = + DCMD_FLOWSRC | DCMD_BURST8 | DCMD_INCTRGADDR | xfer_len; +#ifdef DEBUG + if (!i) + pxa_dma->sg_cpu[i].dcmd |= DCMD_STARTIRQEN; +#endif + pxa_dma->sg_cpu[i].ddadr = + pxa_dma->sg_dma + (i + 1) * sizeof(struct pxa_dma_desc); + + dev_vdbg(dev, "DMA: desc.%08x->@phys=0x%08x, len=%d\n", + pxa_dma->sg_dma + i * sizeof(struct pxa_dma_desc), + sg_dma_address(sg) + offset, xfer_len); + offset = 0; + + if (size == 0) + break; + } + + pxa_dma->sg_cpu[sglen].ddadr = DDADR_STOP; + pxa_dma->sg_cpu[sglen].dcmd = DCMD_FLOWSRC | DCMD_BURST8 | DCMD_ENDIRQEN; + + /* + * Handle 1 special case : + * - in 3 planes (YUV422P format), we might finish with xfer_len equal + * to dma_len (end on PAGE boundary). In this case, the sg element + * for next plane should be the next after the last used to store the + * last scatter gather RAM page + */ + if (xfer_len >= dma_len) { + *sg_first_ofs = xfer_len - dma_len; + *sg_first = sg_next(sg); + } else { + *sg_first_ofs = xfer_len; + *sg_first = sg; + } + + return 0; +} + +static void pxa_videobuf_set_actdma(struct pxa_camera_dev *pcdev, + struct pxa_buffer *buf) +{ + buf->active_dma = DMA_Y; + if (pcdev->channels == 3) + buf->active_dma |= DMA_U | DMA_V; +} + +/* + * Please check the DMA prepared buffer structure in : + * Documentation/video4linux/pxa_camera.txt + * Please check also in pxa_camera_check_link_miss() to understand why DMA chain + * modification while DMA chain is running will work anyway. + */ +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->parent); + struct pxa_camera_dev *pcdev = ici->priv; + struct device *dev = pcdev->soc_host.v4l2_dev.dev; + struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb); + int ret; + int size_y, size_u = 0, size_v = 0; + + dev_dbg(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->code != icd->current_fmt->code || + vb->width != icd->user_width || + vb->height != icd->user_height || + vb->field != field) { + buf->code = icd->current_fmt->code; + vb->width = icd->user_width; + vb->height = icd->user_height; + vb->field = field; + vb->state = VIDEOBUF_NEEDS_INIT; + } + + vb->size = icd->sizeimage; + if (0 != vb->baddr && vb->bsize < vb->size) { + ret = -EINVAL; + goto out; + } + + if (vb->state == VIDEOBUF_NEEDS_INIT) { + int size = vb->size; + int next_ofs = 0; + struct videobuf_dmabuf *dma = videobuf_to_dma(vb); + struct scatterlist *sg; + + ret = videobuf_iolock(vq, vb, NULL); + if (ret) + goto fail; + + if (pcdev->channels == 3) { + size_y = size / 2; + size_u = size_v = size / 4; + } else { + size_y = size; + } + + sg = dma->sglist; + + /* init DMA for Y channel */ + ret = pxa_init_dma_channel(pcdev, buf, dma, 0, CIBR0, size_y, + &sg, &next_ofs); + if (ret) { + dev_err(dev, "DMA initialization for Y/RGB failed\n"); + goto fail; + } + + /* init DMA for U channel */ + if (size_u) + ret = pxa_init_dma_channel(pcdev, buf, dma, 1, CIBR1, + size_u, &sg, &next_ofs); + if (ret) { + dev_err(dev, "DMA initialization for U failed\n"); + goto fail_u; + } + + /* init DMA for V channel */ + if (size_v) + ret = pxa_init_dma_channel(pcdev, buf, dma, 2, CIBR2, + size_v, &sg, &next_ofs); + if (ret) { + dev_err(dev, "DMA initialization for V failed\n"); + goto fail_v; + } + + vb->state = VIDEOBUF_PREPARED; + } + + buf->inwork = 0; + pxa_videobuf_set_actdma(pcdev, buf); + + return 0; + +fail_v: + dma_free_coherent(dev, buf->dmas[1].sg_size, + buf->dmas[1].sg_cpu, buf->dmas[1].sg_dma); +fail_u: + dma_free_coherent(dev, buf->dmas[0].sg_size, + buf->dmas[0].sg_cpu, buf->dmas[0].sg_dma); +fail: + free_buffer(vq, buf); +out: + buf->inwork = 0; + return ret; +} + +/** + * pxa_dma_start_channels - start DMA channel for active buffer + * @pcdev: pxa camera device + * + * Initialize DMA channels to the beginning of the active video buffer, and + * start these channels. + */ +static void pxa_dma_start_channels(struct pxa_camera_dev *pcdev) +{ + int i; + struct pxa_buffer *active; + + active = pcdev->active; + + for (i = 0; i < pcdev->channels; i++) { + dev_dbg(pcdev->soc_host.v4l2_dev.dev, + "%s (channel=%d) ddadr=%08x\n", __func__, + i, active->dmas[i].sg_dma); + DDADR(pcdev->dma_chans[i]) = active->dmas[i].sg_dma; + DCSR(pcdev->dma_chans[i]) = DCSR_RUN; + } +} + +static void pxa_dma_stop_channels(struct pxa_camera_dev *pcdev) +{ + int i; + + for (i = 0; i < pcdev->channels; i++) { + dev_dbg(pcdev->soc_host.v4l2_dev.dev, + "%s (channel=%d)\n", __func__, i); + DCSR(pcdev->dma_chans[i]) = 0; + } +} + +static void pxa_dma_add_tail_buf(struct pxa_camera_dev *pcdev, + struct pxa_buffer *buf) +{ + int i; + struct pxa_dma_desc *buf_last_desc; + + for (i = 0; i < pcdev->channels; i++) { + buf_last_desc = buf->dmas[i].sg_cpu + buf->dmas[i].sglen; + buf_last_desc->ddadr = DDADR_STOP; + + if (pcdev->sg_tail[i]) + /* Link the new buffer to the old tail */ + pcdev->sg_tail[i]->ddadr = buf->dmas[i].sg_dma; + + /* Update the channel tail */ + pcdev->sg_tail[i] = buf_last_desc; + } +} + +/** + * pxa_camera_start_capture - start video capturing + * @pcdev: camera device + * + * Launch capturing. DMA channels should not be active yet. They should get + * activated at the end of frame interrupt, to capture only whole frames, and + * never begin the capture of a partial frame. + */ +static void pxa_camera_start_capture(struct pxa_camera_dev *pcdev) +{ + unsigned long cicr0; + + dev_dbg(pcdev->soc_host.v4l2_dev.dev, "%s\n", __func__); + /* Enable End-Of-Frame Interrupt */ + cicr0 = __raw_readl(pcdev->base + CICR0) | CICR0_ENB; + cicr0 &= ~CICR0_EOFM; + __raw_writel(cicr0, pcdev->base + CICR0); +} + +static void pxa_camera_stop_capture(struct pxa_camera_dev *pcdev) +{ + unsigned long cicr0; + + pxa_dma_stop_channels(pcdev); + + cicr0 = __raw_readl(pcdev->base + CICR0) & ~CICR0_ENB; + __raw_writel(cicr0, pcdev->base + CICR0); + + pcdev->active = NULL; + dev_dbg(pcdev->soc_host.v4l2_dev.dev, "%s\n", __func__); +} + +/* Called under spinlock_irqsave(&pcdev->lock, ...) */ +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->parent); + struct pxa_camera_dev *pcdev = ici->priv; + struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb); + + dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d active=%p\n", + __func__, vb, vb->baddr, vb->bsize, pcdev->active); + + list_add_tail(&vb->queue, &pcdev->capture); + + vb->state = VIDEOBUF_ACTIVE; + pxa_dma_add_tail_buf(pcdev, buf); + + if (!pcdev->active) + pxa_camera_start_capture(pcdev); +} + +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; + struct device *dev = icd->parent; + + dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, + vb, vb->baddr, vb->bsize); + + switch (vb->state) { + case VIDEOBUF_ACTIVE: + dev_dbg(dev, "%s (active)\n", __func__); + break; + case VIDEOBUF_QUEUED: + dev_dbg(dev, "%s (queued)\n", __func__); + break; + case VIDEOBUF_PREPARED: + dev_dbg(dev, "%s (prepared)\n", __func__); + break; + default: + dev_dbg(dev, "%s (unknown)\n", __func__); + break; + } +#endif + + free_buffer(vq, buf); +} + +static void pxa_camera_wakeup(struct pxa_camera_dev *pcdev, + struct videobuf_buffer *vb, + struct pxa_buffer *buf) +{ + int i; + + /* _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); + dev_dbg(pcdev->soc_host.v4l2_dev.dev, "%s dequeud buffer (vb=0x%p)\n", + __func__, vb); + + if (list_empty(&pcdev->capture)) { + pxa_camera_stop_capture(pcdev); + for (i = 0; i < pcdev->channels; i++) + pcdev->sg_tail[i] = NULL; + return; + } + + pcdev->active = list_entry(pcdev->capture.next, + struct pxa_buffer, vb.queue); +} + +/** + * pxa_camera_check_link_miss - check missed DMA linking + * @pcdev: camera device + * + * The DMA chaining is done with DMA running. This means a tiny temporal window + * remains, where a buffer is queued on the chain, while the chain is already + * stopped. This means the tailed buffer would never be transferred by DMA. + * This function restarts the capture for this corner case, where : + * - DADR() == DADDR_STOP + * - a videobuffer is queued on the pcdev->capture list + * + * Please check the "DMA hot chaining timeslice issue" in + * Documentation/video4linux/pxa_camera.txt + * + * Context: should only be called within the dma irq handler + */ +static void pxa_camera_check_link_miss(struct pxa_camera_dev *pcdev) +{ + int i, is_dma_stopped = 1; + + for (i = 0; i < pcdev->channels; i++) + if (DDADR(pcdev->dma_chans[i]) != DDADR_STOP) + is_dma_stopped = 0; + dev_dbg(pcdev->soc_host.v4l2_dev.dev, + "%s : top queued buffer=%p, dma_stopped=%d\n", + __func__, pcdev->active, is_dma_stopped); + if (pcdev->active && is_dma_stopped) + pxa_camera_start_capture(pcdev); +} + +static void pxa_camera_dma_irq(int channel, struct pxa_camera_dev *pcdev, + enum pxa_camera_active_dma act_dma) +{ + struct device *dev = pcdev->soc_host.v4l2_dev.dev; + struct pxa_buffer *buf; + unsigned long flags; + u32 status, camera_status, overrun; + struct videobuf_buffer *vb; + + spin_lock_irqsave(&pcdev->lock, flags); + + status = DCSR(channel); + DCSR(channel) = status; + + camera_status = __raw_readl(pcdev->base + CISR); + overrun = CISR_IFO_0; + if (pcdev->channels == 3) + overrun |= CISR_IFO_1 | CISR_IFO_2; + + if (status & DCSR_BUSERR) { + dev_err(dev, "DMA Bus Error IRQ!\n"); + goto out; + } + + if (!(status & (DCSR_ENDINTR | DCSR_STARTINTR))) { + dev_err(dev, "Unknown DMA IRQ source, status: 0x%08x\n", + status); + goto out; + } + + /* + * pcdev->active should not be NULL in DMA irq handler. + * + * But there is one corner case : if capture was stopped due to an + * overrun of channel 1, and at that same channel 2 was completed. + * + * When handling the overrun in DMA irq for channel 1, we'll stop the + * capture and restart it (and thus set pcdev->active to NULL). But the + * DMA irq handler will already be pending for channel 2. So on entering + * the DMA irq handler for channel 2 there will be no active buffer, yet + * that is normal. + */ + if (!pcdev->active) + goto out; + + vb = &pcdev->active->vb; + buf = container_of(vb, struct pxa_buffer, vb); + WARN_ON(buf->inwork || list_empty(&vb->queue)); + + dev_dbg(dev, "%s channel=%d %s%s(vb=0x%p) dma.desc=%x\n", + __func__, channel, status & DCSR_STARTINTR ? "SOF " : "", + status & DCSR_ENDINTR ? "EOF " : "", vb, DDADR(channel)); + + if (status & DCSR_ENDINTR) { + /* + * It's normal if the last frame creates an overrun, as there + * are no more DMA descriptors to fetch from QCI fifos + */ + if (camera_status & overrun && + !list_is_last(pcdev->capture.next, &pcdev->capture)) { + dev_dbg(dev, "FIFO overrun! CISR: %x\n", + camera_status); + pxa_camera_stop_capture(pcdev); + pxa_camera_start_capture(pcdev); + goto out; + } + buf->active_dma &= ~act_dma; + if (!buf->active_dma) { + pxa_camera_wakeup(pcdev, vb, buf); + pxa_camera_check_link_miss(pcdev); + } + } + +out: + spin_unlock_irqrestore(&pcdev->lock, flags); +} + +static void pxa_camera_dma_irq_y(int channel, void *data) +{ + struct pxa_camera_dev *pcdev = data; + pxa_camera_dma_irq(channel, pcdev, DMA_Y); +} + +static void pxa_camera_dma_irq_u(int channel, void *data) +{ + struct pxa_camera_dev *pcdev = data; + pxa_camera_dma_irq(channel, pcdev, DMA_U); +} + +static void pxa_camera_dma_irq_v(int channel, void *data) +{ + struct pxa_camera_dev *pcdev = data; + pxa_camera_dma_irq(channel, pcdev, DMA_V); +} + +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 void pxa_camera_init_videobuf(struct videobuf_queue *q, + struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct pxa_camera_dev *pcdev = ici->priv; + + /* + * We must pass NULL as dev pointer, then all pci_* dma operations + * transform to normal dma_* ones. + */ + videobuf_queue_sg_init(q, &pxa_videobuf_ops, NULL, &pcdev->lock, + V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE, + sizeof(struct pxa_buffer), icd, &icd->video_lock); +} + +static u32 mclk_get_divisor(struct platform_device *pdev, + struct pxa_camera_dev *pcdev) +{ + unsigned long mclk = pcdev->mclk; + struct device *dev = &pdev->dev; + u32 div; + unsigned long lcdclk; + + lcdclk = clk_get_rate(pcdev->clk); + pcdev->ciclk = lcdclk; + + /* mclk <= ciclk / 4 (27.4.2) */ + if (mclk > lcdclk / 4) { + mclk = lcdclk / 4; + dev_warn(dev, "Limiting master clock to %lu\n", mclk); + } + + /* We verify mclk != 0, so if anyone breaks it, here comes their Oops */ + div = (lcdclk + 2 * mclk - 1) / (2 * mclk) - 1; + + /* If we're not supplying MCLK, leave it at 0 */ + if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN) + pcdev->mclk = lcdclk / (2 * (div + 1)); + + dev_dbg(dev, "LCD clock %luHz, target freq %luHz, divisor %u\n", + lcdclk, mclk, div); + + return div; +} + +static void recalculate_fifo_timeout(struct pxa_camera_dev *pcdev, + unsigned long pclk) +{ + /* We want a timeout > 1 pixel time, not ">=" */ + u32 ciclk_per_pixel = pcdev->ciclk / pclk + 1; + + __raw_writel(ciclk_per_pixel, pcdev->base + CITOR); +} + +static void pxa_camera_activate(struct pxa_camera_dev *pcdev) +{ + u32 cicr4 = 0; + + /* disable all interrupts */ + __raw_writel(0x3ff, pcdev->base + CICR0); + + 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; + + __raw_writel(pcdev->mclk_divisor | cicr4, pcdev->base + CICR4); + + if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN) + /* Initialise the timeout under the assumption pclk = mclk */ + recalculate_fifo_timeout(pcdev, pcdev->mclk); + else + /* "Safe default" - 13MHz */ + recalculate_fifo_timeout(pcdev, 13000000); + + clk_prepare_enable(pcdev->clk); +} + +static void pxa_camera_deactivate(struct pxa_camera_dev *pcdev) +{ + clk_disable_unprepare(pcdev->clk); +} + +static irqreturn_t pxa_camera_irq(int irq, void *data) +{ + struct pxa_camera_dev *pcdev = data; + unsigned long status, cifr, cicr0; + struct pxa_buffer *buf; + struct videobuf_buffer *vb; + + status = __raw_readl(pcdev->base + CISR); + dev_dbg(pcdev->soc_host.v4l2_dev.dev, + "Camera interrupt status 0x%lx\n", status); + + if (!status) + return IRQ_NONE; + + __raw_writel(status, pcdev->base + CISR); + + if (status & CISR_EOF) { + /* Reset the FIFOs */ + cifr = __raw_readl(pcdev->base + CIFR) | CIFR_RESET_F; + __raw_writel(cifr, pcdev->base + CIFR); + + pcdev->active = list_first_entry(&pcdev->capture, + struct pxa_buffer, vb.queue); + vb = &pcdev->active->vb; + buf = container_of(vb, struct pxa_buffer, vb); + pxa_videobuf_set_actdma(pcdev, buf); + + pxa_dma_start_channels(pcdev); + + cicr0 = __raw_readl(pcdev->base + CICR0) | CICR0_EOFM; + __raw_writel(cicr0, pcdev->base + CICR0); + } + + return IRQ_HANDLED; +} + +/* + * The following two functions absolutely depend on the fact, that + * there can be only one camera on PXA quick capture interface + * Called with .video_lock held + */ +static int pxa_camera_add_device(struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct pxa_camera_dev *pcdev = ici->priv; + + if (pcdev->icd) + return -EBUSY; + + pxa_camera_activate(pcdev); + + pcdev->icd = icd; + + dev_info(icd->parent, "PXA Camera driver attached to camera %d\n", + icd->devnum); + + return 0; +} + +/* Called with .video_lock held */ +static void pxa_camera_remove_device(struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct pxa_camera_dev *pcdev = ici->priv; + + BUG_ON(icd != pcdev->icd); + + dev_info(icd->parent, "PXA Camera driver detached from camera %d\n", + icd->devnum); + + /* disable capture, disable interrupts */ + __raw_writel(0x3ff, pcdev->base + CICR0); + + /* Stop DMA engine */ + DCSR(pcdev->dma_chans[0]) = 0; + DCSR(pcdev->dma_chans[1]) = 0; + DCSR(pcdev->dma_chans[2]) = 0; + + 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 ? + V4L2_MBUS_MASTER : V4L2_MBUS_SLAVE) | + V4L2_MBUS_HSYNC_ACTIVE_HIGH | + V4L2_MBUS_HSYNC_ACTIVE_LOW | + V4L2_MBUS_VSYNC_ACTIVE_HIGH | + V4L2_MBUS_VSYNC_ACTIVE_LOW | + V4L2_MBUS_DATA_ACTIVE_HIGH | + V4L2_MBUS_PCLK_SAMPLE_RISING | + V4L2_MBUS_PCLK_SAMPLE_FALLING; + + /* If requested data width is supported by the platform, use it */ + if ((1 << (buswidth - 1)) & pcdev->width_flags) + return 0; + + return -EINVAL; +} + +static void pxa_camera_setup_cicr(struct soc_camera_device *icd, + unsigned long flags, __u32 pixfmt) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct pxa_camera_dev *pcdev = ici->priv; + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + unsigned long dw, bpp; + u32 cicr0, cicr1, cicr2, cicr3, cicr4 = 0, y_skip_top; + int ret = v4l2_subdev_call(sd, sensor, g_skip_top_lines, &y_skip_top); + + if (ret < 0) + y_skip_top = 0; + + /* + * Datawidth is now guaranteed to be equal to one of the three values. + * We fix bit-per-pixel equal to data-width... + */ + switch (icd->current_fmt->host_fmt->bits_per_sample) { + case 10: + dw = 4; + bpp = 0x40; + break; + case 9: + dw = 3; + bpp = 0x20; + break; + default: + /* + * Actually it can only be 8 now, + * default is just to silence compiler warnings + */ + case 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 (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING) + cicr4 |= CICR4_PCP; + if (flags & V4L2_MBUS_HSYNC_ACTIVE_LOW) + cicr4 |= CICR4_HSP; + if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW) + cicr4 |= CICR4_VSP; + + cicr0 = __raw_readl(pcdev->base + CICR0); + if (cicr0 & CICR0_ENB) + __raw_writel(cicr0 & ~CICR0_ENB, pcdev->base + CICR0); + + cicr1 = CICR1_PPL_VAL(icd->user_width - 1) | bpp | dw; + + switch (pixfmt) { + case V4L2_PIX_FMT_YUV422P: + pcdev->channels = 3; + cicr1 |= CICR1_YCBCR_F; + /* + * Normally, pxa bus wants as input UYVY format. We allow all + * reorderings of the YUV422 format, as no processing is done, + * and the YUV stream is just passed through without any + * transformation. Note that UYVY is the only format that + * should be used if pxa framebuffer Overlay2 is used. + */ + case V4L2_PIX_FMT_UYVY: + case V4L2_PIX_FMT_VYUY: + case V4L2_PIX_FMT_YUYV: + case V4L2_PIX_FMT_YVYU: + cicr1 |= CICR1_COLOR_SP_VAL(2); + break; + case V4L2_PIX_FMT_RGB555: + cicr1 |= CICR1_RGB_BPP_VAL(1) | CICR1_RGBT_CONV_VAL(2) | + CICR1_TBIT | CICR1_COLOR_SP_VAL(1); + break; + case V4L2_PIX_FMT_RGB565: + cicr1 |= CICR1_COLOR_SP_VAL(1) | CICR1_RGB_BPP_VAL(2); + break; + } + + cicr2 = 0; + cicr3 = CICR3_LPF_VAL(icd->user_height - 1) | + CICR3_BFW_VAL(min((u32)255, y_skip_top)); + cicr4 |= pcdev->mclk_divisor; + + __raw_writel(cicr1, pcdev->base + CICR1); + __raw_writel(cicr2, pcdev->base + CICR2); + __raw_writel(cicr3, pcdev->base + CICR3); + __raw_writel(cicr4, pcdev->base + CICR4); + + /* CIF interrupts are not used, only DMA */ + cicr0 = (cicr0 & CICR0_ENB) | (pcdev->platform_flags & PXA_CAMERA_MASTER ? + CICR0_SIM_MP : (CICR0_SL_CAP_EN | CICR0_SIM_SP)); + cicr0 |= CICR0_DMAEN | CICR0_IRQ_MASK; + __raw_writel(cicr0, pcdev->base + CICR0); +} + +static int pxa_camera_set_bus_param(struct soc_camera_device *icd) +{ + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct pxa_camera_dev *pcdev = ici->priv; + struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,}; + u32 pixfmt = icd->current_fmt->host_fmt->fourcc; + unsigned long bus_flags, common_flags; + int ret; + struct pxa_cam *cam = icd->host_priv; + + ret = test_platform_param(pcdev, icd->current_fmt->host_fmt->bits_per_sample, + &bus_flags); + if (ret < 0) + return ret; + + ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg); + if (!ret) { + common_flags = soc_mbus_config_compatible(&cfg, + bus_flags); + if (!common_flags) { + dev_warn(icd->parent, + "Flags incompatible: camera 0x%x, host 0x%lx\n", + cfg.flags, bus_flags); + return -EINVAL; + } + } else if (ret != -ENOIOCTLCMD) { + return ret; + } else { + common_flags = bus_flags; + } + + pcdev->channels = 1; + + /* Make choises, based on platform preferences */ + if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) && + (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) { + if (pcdev->platform_flags & PXA_CAMERA_HSP) + common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH; + else + common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW; + } + + if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) && + (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) { + if (pcdev->platform_flags & PXA_CAMERA_VSP) + common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH; + else + common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW; + } + + if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) && + (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) { + if (pcdev->platform_flags & PXA_CAMERA_PCP) + common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING; + else + common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING; + } + + cfg.flags = common_flags; + ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg); + if (ret < 0 && ret != -ENOIOCTLCMD) { + dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n", + common_flags, ret); + return ret; + } + + cam->flags = common_flags; + + pxa_camera_setup_cicr(icd, common_flags, pixfmt); + + return 0; +} + +static int pxa_camera_try_bus_param(struct soc_camera_device *icd, + unsigned char buswidth) +{ + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct pxa_camera_dev *pcdev = ici->priv; + struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,}; + unsigned long bus_flags, common_flags; + int ret = test_platform_param(pcdev, buswidth, &bus_flags); + + if (ret < 0) + return ret; + + ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg); + if (!ret) { + common_flags = soc_mbus_config_compatible(&cfg, + bus_flags); + if (!common_flags) { + dev_warn(icd->parent, + "Flags incompatible: camera 0x%x, host 0x%lx\n", + cfg.flags, bus_flags); + return -EINVAL; + } + } else if (ret == -ENOIOCTLCMD) { + ret = 0; + } + + return ret; +} + +static const struct soc_mbus_pixelfmt pxa_camera_formats[] = { + { + .fourcc = V4L2_PIX_FMT_YUV422P, + .name = "Planar YUV422 16 bit", + .bits_per_sample = 8, + .packing = SOC_MBUS_PACKING_2X8_PADHI, + .order = SOC_MBUS_ORDER_LE, + .layout = SOC_MBUS_LAYOUT_PLANAR_2Y_U_V, + }, +}; + +/* This will be corrected as we get more formats */ +static bool pxa_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt) +{ + return fmt->packing == SOC_MBUS_PACKING_NONE || + (fmt->bits_per_sample == 8 && + fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) || + (fmt->bits_per_sample > 8 && + fmt->packing == SOC_MBUS_PACKING_EXTEND16); +} + +static int pxa_camera_get_formats(struct soc_camera_device *icd, unsigned int idx, + struct soc_camera_format_xlate *xlate) +{ + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + struct device *dev = icd->parent; + int formats = 0, ret; + struct pxa_cam *cam; + enum v4l2_mbus_pixelcode code; + const struct soc_mbus_pixelfmt *fmt; + + ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code); + if (ret < 0) + /* No more formats */ + return 0; + + fmt = soc_mbus_get_fmtdesc(code); + if (!fmt) { + dev_err(dev, "Invalid format code #%u: %d\n", idx, code); + return 0; + } + + /* This also checks support for the requested bits-per-sample */ + ret = pxa_camera_try_bus_param(icd, fmt->bits_per_sample); + if (ret < 0) + return 0; + + if (!icd->host_priv) { + cam = kzalloc(sizeof(*cam), GFP_KERNEL); + if (!cam) + return -ENOMEM; + + icd->host_priv = cam; + } else { + cam = icd->host_priv; + } + + switch (code) { + case V4L2_MBUS_FMT_UYVY8_2X8: + formats++; + if (xlate) { + xlate->host_fmt = &pxa_camera_formats[0]; + xlate->code = code; + xlate++; + dev_dbg(dev, "Providing format %s using code %d\n", + pxa_camera_formats[0].name, code); + } + case V4L2_MBUS_FMT_VYUY8_2X8: + case V4L2_MBUS_FMT_YUYV8_2X8: + case V4L2_MBUS_FMT_YVYU8_2X8: + case V4L2_MBUS_FMT_RGB565_2X8_LE: + case V4L2_MBUS_FMT_RGB555_2X8_PADHI_LE: + if (xlate) + dev_dbg(dev, "Providing format %s packed\n", + fmt->name); + break; + default: + if (!pxa_camera_packing_supported(fmt)) + return 0; + if (xlate) + dev_dbg(dev, + "Providing format %s in pass-through mode\n", + fmt->name); + } + + /* Generic pass-through */ + formats++; + if (xlate) { + xlate->host_fmt = fmt; + xlate->code = code; + xlate++; + } + + return formats; +} + +static void pxa_camera_put_formats(struct soc_camera_device *icd) +{ + kfree(icd->host_priv); + icd->host_priv = NULL; +} + +static int pxa_camera_check_frame(u32 width, u32 height) +{ + /* limit to pxa hardware capabilities */ + return height < 32 || height > 2048 || width < 48 || width > 2048 || + (width & 0x01); +} + +static int pxa_camera_set_crop(struct soc_camera_device *icd, + struct v4l2_crop *a) +{ + struct v4l2_rect *rect = &a->c; + struct device *dev = icd->parent; + struct soc_camera_host *ici = to_soc_camera_host(dev); + struct pxa_camera_dev *pcdev = ici->priv; + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + struct soc_camera_sense sense = { + .master_clock = pcdev->mclk, + .pixel_clock_max = pcdev->ciclk / 4, + }; + struct v4l2_mbus_framefmt mf; + struct pxa_cam *cam = icd->host_priv; + u32 fourcc = icd->current_fmt->host_fmt->fourcc; + int ret; + + /* If PCLK is used to latch data from the sensor, check sense */ + if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN) + icd->sense = &sense; + + ret = v4l2_subdev_call(sd, video, s_crop, a); + + icd->sense = NULL; + + if (ret < 0) { + dev_warn(dev, "Failed to crop to %ux%u@%u:%u\n", + rect->width, rect->height, rect->left, rect->top); + return ret; + } + + ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf); + if (ret < 0) + return ret; + + if (pxa_camera_check_frame(mf.width, mf.height)) { + /* + * Camera cropping produced a frame beyond our capabilities. + * FIXME: just extract a subframe, that we can process. + */ + v4l_bound_align_image(&mf.width, 48, 2048, 1, + &mf.height, 32, 2048, 0, + fourcc == V4L2_PIX_FMT_YUV422P ? 4 : 0); + ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf); + if (ret < 0) + return ret; + + if (pxa_camera_check_frame(mf.width, mf.height)) { + dev_warn(icd->parent, + "Inconsistent state. Use S_FMT to repair\n"); + return -EINVAL; + } + } + + if (sense.flags & SOCAM_SENSE_PCLK_CHANGED) { + if (sense.pixel_clock > sense.pixel_clock_max) { + dev_err(dev, + "pixel clock %lu set by the camera too high!", + sense.pixel_clock); + return -EIO; + } + recalculate_fifo_timeout(pcdev, sense.pixel_clock); + } + + icd->user_width = mf.width; + icd->user_height = mf.height; + + pxa_camera_setup_cicr(icd, cam->flags, fourcc); + + return ret; +} + +static int pxa_camera_set_fmt(struct soc_camera_device *icd, + struct v4l2_format *f) +{ + struct device *dev = icd->parent; + struct soc_camera_host *ici = to_soc_camera_host(dev); + struct pxa_camera_dev *pcdev = ici->priv; + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + const struct soc_camera_format_xlate *xlate = NULL; + struct soc_camera_sense sense = { + .master_clock = pcdev->mclk, + .pixel_clock_max = pcdev->ciclk / 4, + }; + struct v4l2_pix_format *pix = &f->fmt.pix; + struct v4l2_mbus_framefmt mf; + int ret; + + xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat); + if (!xlate) { + dev_warn(dev, "Format %x not found\n", pix->pixelformat); + return -EINVAL; + } + + /* If PCLK is used to latch data from the sensor, check sense */ + if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN) + /* The caller holds a mutex. */ + icd->sense = &sense; + + mf.width = pix->width; + mf.height = pix->height; + mf.field = pix->field; + mf.colorspace = pix->colorspace; + mf.code = xlate->code; + + ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf); + + if (mf.code != xlate->code) + return -EINVAL; + + icd->sense = NULL; + + if (ret < 0) { + dev_warn(dev, "Failed to configure for format %x\n", + pix->pixelformat); + } else if (pxa_camera_check_frame(mf.width, mf.height)) { + dev_warn(dev, + "Camera driver produced an unsupported frame %dx%d\n", + mf.width, mf.height); + ret = -EINVAL; + } else if (sense.flags & SOCAM_SENSE_PCLK_CHANGED) { + if (sense.pixel_clock > sense.pixel_clock_max) { + dev_err(dev, + "pixel clock %lu set by the camera too high!", + sense.pixel_clock); + return -EIO; + } + recalculate_fifo_timeout(pcdev, sense.pixel_clock); + } + + if (ret < 0) + return ret; + + pix->width = mf.width; + pix->height = mf.height; + pix->field = mf.field; + pix->colorspace = mf.colorspace; + icd->current_fmt = xlate; + + return ret; +} + +static int pxa_camera_try_fmt(struct soc_camera_device *icd, + struct v4l2_format *f) +{ + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + const struct soc_camera_format_xlate *xlate; + struct v4l2_pix_format *pix = &f->fmt.pix; + struct v4l2_mbus_framefmt mf; + __u32 pixfmt = pix->pixelformat; + int ret; + + xlate = soc_camera_xlate_by_fourcc(icd, pixfmt); + if (!xlate) { + dev_warn(icd->parent, "Format %x not found\n", pixfmt); + return -EINVAL; + } + + /* + * Limit to pxa hardware capabilities. YUV422P planar format requires + * images size to be a multiple of 16 bytes. If not, zeros will be + * inserted between Y and U planes, and U and V planes, which violates + * the YUV422P standard. + */ + v4l_bound_align_image(&pix->width, 48, 2048, 1, + &pix->height, 32, 2048, 0, + pixfmt == V4L2_PIX_FMT_YUV422P ? 4 : 0); + + /* limit to sensor capabilities */ + mf.width = pix->width; + mf.height = pix->height; + /* Only progressive video supported so far */ + mf.field = V4L2_FIELD_NONE; + mf.colorspace = pix->colorspace; + mf.code = xlate->code; + + ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf); + if (ret < 0) + return ret; + + pix->width = mf.width; + pix->height = mf.height; + pix->colorspace = mf.colorspace; + + switch (mf.field) { + case V4L2_FIELD_ANY: + case V4L2_FIELD_NONE: + pix->field = V4L2_FIELD_NONE; + break; + default: + /* TODO: support interlaced at least in pass-through mode */ + dev_err(icd->parent, "Field type %d unsupported.\n", + mf.field); + return -EINVAL; + } + + return ret; +} + +static int pxa_camera_reqbufs(struct soc_camera_device *icd, + struct v4l2_requestbuffers *p) +{ + int i; + + /* + * This is for locking debugging only. I removed spinlocks and now I + * check whether .prepare is ever called on a linked buffer, or whether + * a dma IRQ can occur for an in-work or unlinked buffer. Until now + * it hadn't triggered + */ + for (i = 0; i < p->count; i++) { + struct pxa_buffer *buf = container_of(icd->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_device *icd = file->private_data; + struct pxa_buffer *buf; + + buf = list_entry(icd->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->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING; + + return 0; +} + +static int pxa_camera_suspend(struct device *dev) +{ + struct soc_camera_host *ici = to_soc_camera_host(dev); + struct pxa_camera_dev *pcdev = ici->priv; + int i = 0, ret = 0; + + pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR0); + pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR1); + pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR2); + pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR3); + pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR4); + + if (pcdev->icd) { + struct v4l2_subdev *sd = soc_camera_to_subdev(pcdev->icd); + ret = v4l2_subdev_call(sd, core, s_power, 0); + if (ret == -ENOIOCTLCMD) + ret = 0; + } + + return ret; +} + +static int pxa_camera_resume(struct device *dev) +{ + struct soc_camera_host *ici = to_soc_camera_host(dev); + struct pxa_camera_dev *pcdev = ici->priv; + int i = 0, ret = 0; + + DRCMR(68) = pcdev->dma_chans[0] | DRCMR_MAPVLD; + DRCMR(69) = pcdev->dma_chans[1] | DRCMR_MAPVLD; + DRCMR(70) = pcdev->dma_chans[2] | DRCMR_MAPVLD; + + __raw_writel(pcdev->save_cicr[i++] & ~CICR0_ENB, pcdev->base + CICR0); + __raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR1); + __raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR2); + __raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR3); + __raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR4); + + if (pcdev->icd) { + struct v4l2_subdev *sd = soc_camera_to_subdev(pcdev->icd); + ret = v4l2_subdev_call(sd, core, s_power, 1); + if (ret == -ENOIOCTLCMD) + ret = 0; + } + + /* Restart frame capture if active buffer exists */ + if (!ret && pcdev->active) + pxa_camera_start_capture(pcdev); + + return ret; +} + +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_crop = pxa_camera_set_crop, + .get_formats = pxa_camera_get_formats, + .put_formats = pxa_camera_put_formats, + .set_fmt = pxa_camera_set_fmt, + .try_fmt = pxa_camera_try_fmt, + .init_videobuf = pxa_camera_init_videobuf, + .reqbufs = pxa_camera_reqbufs, + .poll = pxa_camera_poll, + .querycap = pxa_camera_querycap, + .set_bus_param = pxa_camera_set_bus_param, +}; + +static int __devinit pxa_camera_probe(struct platform_device *pdev) +{ + struct pxa_camera_dev *pcdev; + struct resource *res; + void __iomem *base; + int irq; + int err = 0; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + irq = platform_get_irq(pdev, 0); + if (!res || irq < 0) { + 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, NULL); + if (IS_ERR(pcdev->clk)) { + err = PTR_ERR(pcdev->clk); + goto exit_kfree; + } + + 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; + } + if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_8) + pcdev->width_flags = 1 << 7; + if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_9) + pcdev->width_flags |= 1 << 8; + if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_10) + pcdev->width_flags |= 1 << 9; + pcdev->mclk = pcdev->pdata->mclk_10khz * 10000; + if (!pcdev->mclk) { + dev_warn(&pdev->dev, + "mclk == 0! Please, fix your platform data. " + "Using default 20MHz\n"); + pcdev->mclk = 20000000; + } + + pcdev->mclk_divisor = mclk_get_divisor(pdev, pcdev); + + INIT_LIST_HEAD(&pcdev->capture); + spin_lock_init(&pcdev->lock); + + /* + * Request the regions. + */ + if (!request_mem_region(res->start, resource_size(res), + PXA_CAM_DRV_NAME)) { + err = -EBUSY; + goto exit_clk; + } + + base = ioremap(res->start, resource_size(res)); + if (!base) { + err = -ENOMEM; + goto exit_release; + } + pcdev->irq = irq; + pcdev->base = base; + + /* request dma */ + err = pxa_request_dma("CI_Y", DMA_PRIO_HIGH, + pxa_camera_dma_irq_y, pcdev); + if (err < 0) { + dev_err(&pdev->dev, "Can't request DMA for Y\n"); + goto exit_iounmap; + } + pcdev->dma_chans[0] = err; + dev_dbg(&pdev->dev, "got DMA channel %d\n", pcdev->dma_chans[0]); + + err = pxa_request_dma("CI_U", DMA_PRIO_HIGH, + pxa_camera_dma_irq_u, pcdev); + if (err < 0) { + dev_err(&pdev->dev, "Can't request DMA for U\n"); + goto exit_free_dma_y; + } + pcdev->dma_chans[1] = err; + dev_dbg(&pdev->dev, "got DMA channel (U) %d\n", pcdev->dma_chans[1]); + + err = pxa_request_dma("CI_V", DMA_PRIO_HIGH, + pxa_camera_dma_irq_v, pcdev); + if (err < 0) { + dev_err(&pdev->dev, "Can't request DMA for V\n"); + goto exit_free_dma_u; + } + pcdev->dma_chans[2] = err; + dev_dbg(&pdev->dev, "got DMA channel (V) %d\n", pcdev->dma_chans[2]); + + DRCMR(68) = pcdev->dma_chans[0] | DRCMR_MAPVLD; + DRCMR(69) = pcdev->dma_chans[1] | DRCMR_MAPVLD; + DRCMR(70) = pcdev->dma_chans[2] | DRCMR_MAPVLD; + + /* request irq */ + err = request_irq(pcdev->irq, pxa_camera_irq, 0, PXA_CAM_DRV_NAME, + pcdev); + if (err) { + dev_err(&pdev->dev, "Camera interrupt register failed \n"); + goto exit_free_dma; + } + + pcdev->soc_host.drv_name = PXA_CAM_DRV_NAME; + pcdev->soc_host.ops = &pxa_soc_camera_host_ops; + pcdev->soc_host.priv = pcdev; + pcdev->soc_host.v4l2_dev.dev = &pdev->dev; + pcdev->soc_host.nr = pdev->id; + + err = soc_camera_host_register(&pcdev->soc_host); + if (err) + goto exit_free_irq; + + return 0; + +exit_free_irq: + free_irq(pcdev->irq, pcdev); +exit_free_dma: + pxa_free_dma(pcdev->dma_chans[2]); +exit_free_dma_u: + pxa_free_dma(pcdev->dma_chans[1]); +exit_free_dma_y: + pxa_free_dma(pcdev->dma_chans[0]); +exit_iounmap: + iounmap(base); +exit_release: + release_mem_region(res->start, resource_size(res)); +exit_clk: + clk_put(pcdev->clk); +exit_kfree: + kfree(pcdev); +exit: + return err; +} + +static int __devexit pxa_camera_remove(struct platform_device *pdev) +{ + struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev); + struct pxa_camera_dev *pcdev = container_of(soc_host, + struct pxa_camera_dev, soc_host); + struct resource *res; + + clk_put(pcdev->clk); + + pxa_free_dma(pcdev->dma_chans[0]); + pxa_free_dma(pcdev->dma_chans[1]); + pxa_free_dma(pcdev->dma_chans[2]); + free_irq(pcdev->irq, pcdev); + + soc_camera_host_unregister(soc_host); + + iounmap(pcdev->base); + + res = pcdev->res; + release_mem_region(res->start, resource_size(res)); + + kfree(pcdev); + + dev_info(&pdev->dev, "PXA Camera driver unloaded\n"); + + return 0; +} + +static struct dev_pm_ops pxa_camera_pm = { + .suspend = pxa_camera_suspend, + .resume = pxa_camera_resume, +}; + +static struct platform_driver pxa_camera_driver = { + .driver = { + .name = PXA_CAM_DRV_NAME, + .pm = &pxa_camera_pm, + }, + .probe = pxa_camera_probe, + .remove = __devexit_p(pxa_camera_remove), +}; + +module_platform_driver(pxa_camera_driver); + +MODULE_DESCRIPTION("PXA27x SoC Camera Host driver"); +MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(PXA_CAM_VERSION); +MODULE_ALIAS("platform:" PXA_CAM_DRV_NAME); |
