diff options
Diffstat (limited to 'drivers/media/platform/soc_camera/atmel-isi.c')
| -rw-r--r-- | drivers/media/platform/soc_camera/atmel-isi.c | 1099 |
1 files changed, 1099 insertions, 0 deletions
diff --git a/drivers/media/platform/soc_camera/atmel-isi.c b/drivers/media/platform/soc_camera/atmel-isi.c new file mode 100644 index 000000000000..6274a91c25c7 --- /dev/null +++ b/drivers/media/platform/soc_camera/atmel-isi.c @@ -0,0 +1,1099 @@ +/* + * Copyright (c) 2011 Atmel Corporation + * Josh Wu, <josh.wu@atmel.com> + * + * Based on previous work by Lars Haring, <lars.haring@atmel.com> + * and Sedji Gaouaou + * Based on the bttv driver for Bt848 with respective copyright holders + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/fs.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include <media/atmel-isi.h> +#include <media/soc_camera.h> +#include <media/soc_mediabus.h> +#include <media/videobuf2-dma-contig.h> + +#define MAX_BUFFER_NUM 32 +#define MAX_SUPPORT_WIDTH 2048 +#define MAX_SUPPORT_HEIGHT 2048 +#define VID_LIMIT_BYTES (16 * 1024 * 1024) +#define MIN_FRAME_RATE 15 +#define FRAME_INTERVAL_MILLI_SEC (1000 / MIN_FRAME_RATE) + +/* ISI states */ +enum { + ISI_STATE_IDLE = 0, + ISI_STATE_READY, + ISI_STATE_WAIT_SOF, +}; + +/* Frame buffer descriptor */ +struct fbd { + /* Physical address of the frame buffer */ + u32 fb_address; + /* DMA Control Register(only in HISI2) */ + u32 dma_ctrl; + /* Physical address of the next fbd */ + u32 next_fbd_address; +}; + +static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl) +{ + fb_desc->dma_ctrl = ctrl; +} + +struct isi_dma_desc { + struct list_head list; + struct fbd *p_fbd; + u32 fbd_phys; +}; + +/* Frame buffer data */ +struct frame_buffer { + struct vb2_buffer vb; + struct isi_dma_desc *p_dma_desc; + struct list_head list; +}; + +struct atmel_isi { + /* Protects the access of variables shared with the ISR */ + spinlock_t lock; + void __iomem *regs; + + int sequence; + /* State of the ISI module in capturing mode */ + int state; + + /* Wait queue for waiting for SOF */ + wait_queue_head_t vsync_wq; + + struct vb2_alloc_ctx *alloc_ctx; + + /* Allocate descriptors for dma buffer use */ + struct fbd *p_fb_descriptors; + u32 fb_descriptors_phys; + struct list_head dma_desc_head; + struct isi_dma_desc dma_desc[MAX_BUFFER_NUM]; + + struct completion complete; + /* ISI peripherial clock */ + struct clk *pclk; + /* ISI_MCK, feed to camera sensor to generate pixel clock */ + struct clk *mck; + unsigned int irq; + + struct isi_platform_data *pdata; + u16 width_flags; /* max 12 bits */ + + struct list_head video_buffer_list; + struct frame_buffer *active; + + struct soc_camera_device *icd; + struct soc_camera_host soc_host; +}; + +static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val) +{ + writel(val, isi->regs + reg); +} +static u32 isi_readl(struct atmel_isi *isi, u32 reg) +{ + return readl(isi->regs + reg); +} + +static int configure_geometry(struct atmel_isi *isi, u32 width, + u32 height, enum v4l2_mbus_pixelcode code) +{ + u32 cfg2, cr; + + switch (code) { + /* YUV, including grey */ + case V4L2_MBUS_FMT_Y8_1X8: + cr = ISI_CFG2_GRAYSCALE; + break; + case V4L2_MBUS_FMT_UYVY8_2X8: + cr = ISI_CFG2_YCC_SWAP_MODE_3; + break; + case V4L2_MBUS_FMT_VYUY8_2X8: + cr = ISI_CFG2_YCC_SWAP_MODE_2; + break; + case V4L2_MBUS_FMT_YUYV8_2X8: + cr = ISI_CFG2_YCC_SWAP_MODE_1; + break; + case V4L2_MBUS_FMT_YVYU8_2X8: + cr = ISI_CFG2_YCC_SWAP_DEFAULT; + break; + /* RGB, TODO */ + default: + return -EINVAL; + } + + isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); + + cfg2 = isi_readl(isi, ISI_CFG2); + cfg2 |= cr; + /* Set width */ + cfg2 &= ~(ISI_CFG2_IM_HSIZE_MASK); + cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) & + ISI_CFG2_IM_HSIZE_MASK; + /* Set height */ + cfg2 &= ~(ISI_CFG2_IM_VSIZE_MASK); + cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET) + & ISI_CFG2_IM_VSIZE_MASK; + isi_writel(isi, ISI_CFG2, cfg2); + + return 0; +} + +static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi) +{ + if (isi->active) { + struct vb2_buffer *vb = &isi->active->vb; + struct frame_buffer *buf = isi->active; + + list_del_init(&buf->list); + do_gettimeofday(&vb->v4l2_buf.timestamp); + vb->v4l2_buf.sequence = isi->sequence++; + vb2_buffer_done(vb, VB2_BUF_STATE_DONE); + } + + if (list_empty(&isi->video_buffer_list)) { + isi->active = NULL; + } else { + /* start next dma frame. */ + isi->active = list_entry(isi->video_buffer_list.next, + struct frame_buffer, list); + isi_writel(isi, ISI_DMA_C_DSCR, + isi->active->p_dma_desc->fbd_phys); + isi_writel(isi, ISI_DMA_C_CTRL, + ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE); + isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH); + } + return IRQ_HANDLED; +} + +/* ISI interrupt service routine */ +static irqreturn_t isi_interrupt(int irq, void *dev_id) +{ + struct atmel_isi *isi = dev_id; + u32 status, mask, pending; + irqreturn_t ret = IRQ_NONE; + + spin_lock(&isi->lock); + + status = isi_readl(isi, ISI_STATUS); + mask = isi_readl(isi, ISI_INTMASK); + pending = status & mask; + + if (pending & ISI_CTRL_SRST) { + complete(&isi->complete); + isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST); + ret = IRQ_HANDLED; + } else if (pending & ISI_CTRL_DIS) { + complete(&isi->complete); + isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS); + ret = IRQ_HANDLED; + } else { + if ((pending & ISI_SR_VSYNC) && + (isi->state == ISI_STATE_IDLE)) { + isi->state = ISI_STATE_READY; + wake_up_interruptible(&isi->vsync_wq); + ret = IRQ_HANDLED; + } + if (likely(pending & ISI_SR_CXFR_DONE)) + ret = atmel_isi_handle_streaming(isi); + } + + spin_unlock(&isi->lock); + return ret; +} + +#define WAIT_ISI_RESET 1 +#define WAIT_ISI_DISABLE 0 +static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset) +{ + unsigned long timeout; + /* + * The reset or disable will only succeed if we have a + * pixel clock from the camera. + */ + init_completion(&isi->complete); + + if (wait_reset) { + isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST); + isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST); + } else { + isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS); + isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); + } + + timeout = wait_for_completion_timeout(&isi->complete, + msecs_to_jiffies(100)); + if (timeout == 0) + return -ETIMEDOUT; + + return 0; +} + +/* ------------------------------------------------------------------ + Videobuf operations + ------------------------------------------------------------------*/ +static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt, + unsigned int *nbuffers, unsigned int *nplanes, + unsigned int sizes[], void *alloc_ctxs[]) +{ + struct soc_camera_device *icd = soc_camera_from_vb2q(vq); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct atmel_isi *isi = ici->priv; + unsigned long size; + int ret; + + /* Reset ISI */ + ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET); + if (ret < 0) { + dev_err(icd->parent, "Reset ISI timed out\n"); + return ret; + } + /* Disable all interrupts */ + isi_writel(isi, ISI_INTDIS, ~0UL); + + size = icd->sizeimage; + + if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM) + *nbuffers = MAX_BUFFER_NUM; + + if (size * *nbuffers > VID_LIMIT_BYTES) + *nbuffers = VID_LIMIT_BYTES / size; + + *nplanes = 1; + sizes[0] = size; + alloc_ctxs[0] = isi->alloc_ctx; + + isi->sequence = 0; + isi->active = NULL; + + dev_dbg(icd->parent, "%s, count=%d, size=%ld\n", __func__, + *nbuffers, size); + + return 0; +} + +static int buffer_init(struct vb2_buffer *vb) +{ + struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb); + + buf->p_dma_desc = NULL; + INIT_LIST_HEAD(&buf->list); + + return 0; +} + +static int buffer_prepare(struct vb2_buffer *vb) +{ + struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue); + struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct atmel_isi *isi = ici->priv; + unsigned long size; + struct isi_dma_desc *desc; + + size = icd->sizeimage; + + if (vb2_plane_size(vb, 0) < size) { + dev_err(icd->parent, "%s data will not fit into plane (%lu < %lu)\n", + __func__, vb2_plane_size(vb, 0), size); + return -EINVAL; + } + + vb2_set_plane_payload(&buf->vb, 0, size); + + if (!buf->p_dma_desc) { + if (list_empty(&isi->dma_desc_head)) { + dev_err(icd->parent, "Not enough dma descriptors.\n"); + return -EINVAL; + } else { + /* Get an available descriptor */ + desc = list_entry(isi->dma_desc_head.next, + struct isi_dma_desc, list); + /* Delete the descriptor since now it is used */ + list_del_init(&desc->list); + + /* Initialize the dma descriptor */ + desc->p_fbd->fb_address = + vb2_dma_contig_plane_dma_addr(vb, 0); + desc->p_fbd->next_fbd_address = 0; + set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB); + + buf->p_dma_desc = desc; + } + } + return 0; +} + +static void buffer_cleanup(struct vb2_buffer *vb) +{ + struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct atmel_isi *isi = ici->priv; + struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb); + + /* This descriptor is available now and we add to head list */ + if (buf->p_dma_desc) + list_add(&buf->p_dma_desc->list, &isi->dma_desc_head); +} + +static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer) +{ + u32 ctrl, cfg1; + + cfg1 = isi_readl(isi, ISI_CFG1); + /* Enable irq: cxfr for the codec path, pxfr for the preview path */ + isi_writel(isi, ISI_INTEN, + ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE); + + /* Check if already in a frame */ + if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) { + dev_err(isi->icd->parent, "Already in frame handling.\n"); + return; + } + + isi_writel(isi, ISI_DMA_C_DSCR, buffer->p_dma_desc->fbd_phys); + isi_writel(isi, ISI_DMA_C_CTRL, ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE); + isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH); + + /* Enable linked list */ + cfg1 |= isi->pdata->frate | ISI_CFG1_DISCR; + + /* Enable codec path and ISI */ + ctrl = ISI_CTRL_CDC | ISI_CTRL_EN; + isi_writel(isi, ISI_CTRL, ctrl); + isi_writel(isi, ISI_CFG1, cfg1); +} + +static void buffer_queue(struct vb2_buffer *vb) +{ + struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct atmel_isi *isi = ici->priv; + struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb); + unsigned long flags = 0; + + spin_lock_irqsave(&isi->lock, flags); + list_add_tail(&buf->list, &isi->video_buffer_list); + + if (isi->active == NULL) { + isi->active = buf; + if (vb2_is_streaming(vb->vb2_queue)) + start_dma(isi, buf); + } + spin_unlock_irqrestore(&isi->lock, flags); +} + +static int start_streaming(struct vb2_queue *vq, unsigned int count) +{ + struct soc_camera_device *icd = soc_camera_from_vb2q(vq); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct atmel_isi *isi = ici->priv; + + u32 sr = 0; + int ret; + + spin_lock_irq(&isi->lock); + isi->state = ISI_STATE_IDLE; + /* Clear any pending SOF interrupt */ + sr = isi_readl(isi, ISI_STATUS); + /* Enable VSYNC interrupt for SOF */ + isi_writel(isi, ISI_INTEN, ISI_SR_VSYNC); + isi_writel(isi, ISI_CTRL, ISI_CTRL_EN); + spin_unlock_irq(&isi->lock); + + dev_dbg(icd->parent, "Waiting for SOF\n"); + ret = wait_event_interruptible(isi->vsync_wq, + isi->state != ISI_STATE_IDLE); + if (ret) + goto err; + + if (isi->state != ISI_STATE_READY) { + ret = -EIO; + goto err; + } + + spin_lock_irq(&isi->lock); + isi->state = ISI_STATE_WAIT_SOF; + isi_writel(isi, ISI_INTDIS, ISI_SR_VSYNC); + if (count) + start_dma(isi, isi->active); + spin_unlock_irq(&isi->lock); + + return 0; +err: + isi->active = NULL; + isi->sequence = 0; + INIT_LIST_HEAD(&isi->video_buffer_list); + return ret; +} + +/* abort streaming and wait for last buffer */ +static int stop_streaming(struct vb2_queue *vq) +{ + struct soc_camera_device *icd = soc_camera_from_vb2q(vq); + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct atmel_isi *isi = ici->priv; + struct frame_buffer *buf, *node; + int ret = 0; + unsigned long timeout; + + spin_lock_irq(&isi->lock); + isi->active = NULL; + /* Release all active buffers */ + list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) { + list_del_init(&buf->list); + vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR); + } + spin_unlock_irq(&isi->lock); + + timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ; + /* Wait until the end of the current frame. */ + while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) && + time_before(jiffies, timeout)) + msleep(1); + + if (time_after(jiffies, timeout)) { + dev_err(icd->parent, + "Timeout waiting for finishing codec request\n"); + return -ETIMEDOUT; + } + + /* Disable interrupts */ + isi_writel(isi, ISI_INTDIS, + ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE); + + /* Disable ISI and wait for it is done */ + ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE); + if (ret < 0) + dev_err(icd->parent, "Disable ISI timed out\n"); + + return ret; +} + +static struct vb2_ops isi_video_qops = { + .queue_setup = queue_setup, + .buf_init = buffer_init, + .buf_prepare = buffer_prepare, + .buf_cleanup = buffer_cleanup, + .buf_queue = buffer_queue, + .start_streaming = start_streaming, + .stop_streaming = stop_streaming, + .wait_prepare = soc_camera_unlock, + .wait_finish = soc_camera_lock, +}; + +/* ------------------------------------------------------------------ + SOC camera operations for the device + ------------------------------------------------------------------*/ +static int isi_camera_init_videobuf(struct vb2_queue *q, + struct soc_camera_device *icd) +{ + q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + q->io_modes = VB2_MMAP; + q->drv_priv = icd; + q->buf_struct_size = sizeof(struct frame_buffer); + q->ops = &isi_video_qops; + q->mem_ops = &vb2_dma_contig_memops; + + return vb2_queue_init(q); +} + +static int isi_camera_set_fmt(struct soc_camera_device *icd, + struct v4l2_format *f) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct atmel_isi *isi = ici->priv; + struct v4l2_subdev *sd = soc_camera_to_subdev(icd); + const struct soc_camera_format_xlate *xlate; + struct v4l2_pix_format *pix = &f->fmt.pix; + struct v4l2_mbus_framefmt mf; + int ret; + + xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat); + if (!xlate) { + dev_warn(icd->parent, "Format %x not found\n", + pix->pixelformat); + return -EINVAL; + } + + dev_dbg(icd->parent, "Plan to set format %dx%d\n", + pix->width, pix->height); + + mf.width = pix->width; + mf.height = pix->height; + mf.field = pix->field; + mf.colorspace = pix->colorspace; + mf.code = xlate->code; + + ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf); + if (ret < 0) + return ret; + + if (mf.code != xlate->code) + return -EINVAL; + + ret = configure_geometry(isi, pix->width, pix->height, xlate->code); + 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; + + dev_dbg(icd->parent, "Finally set format %dx%d\n", + pix->width, pix->height); + + return ret; +} + +static int isi_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 (pixfmt && !xlate) { + dev_warn(icd->parent, "Format %x not found\n", pixfmt); + return -EINVAL; + } + + /* limit to Atmel ISI hardware capabilities */ + if (pix->height > MAX_SUPPORT_HEIGHT) + pix->height = MAX_SUPPORT_HEIGHT; + if (pix->width > MAX_SUPPORT_WIDTH) + pix->width = MAX_SUPPORT_WIDTH; + + /* limit to sensor capabilities */ + 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, 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: + pix->field = V4L2_FIELD_NONE; + break; + case V4L2_FIELD_NONE: + break; + default: + dev_err(icd->parent, "Field type %d unsupported.\n", + mf.field); + ret = -EINVAL; + } + + return ret; +} + +static const struct soc_mbus_pixelfmt isi_camera_formats[] = { + { + .fourcc = V4L2_PIX_FMT_YUYV, + .name = "Packed YUV422 16 bit", + .bits_per_sample = 8, + .packing = SOC_MBUS_PACKING_2X8_PADHI, + .order = SOC_MBUS_ORDER_LE, + .layout = SOC_MBUS_LAYOUT_PACKED, + }, +}; + +/* This will be corrected as we get more formats */ +static bool isi_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); +} + +#define ISI_BUS_PARAM (V4L2_MBUS_MASTER | \ + V4L2_MBUS_HSYNC_ACTIVE_HIGH | \ + V4L2_MBUS_HSYNC_ACTIVE_LOW | \ + V4L2_MBUS_VSYNC_ACTIVE_HIGH | \ + V4L2_MBUS_VSYNC_ACTIVE_LOW | \ + V4L2_MBUS_PCLK_SAMPLE_RISING | \ + V4L2_MBUS_PCLK_SAMPLE_FALLING | \ + V4L2_MBUS_DATA_ACTIVE_HIGH) + +static int isi_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 atmel_isi *isi = ici->priv; + struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,}; + unsigned long common_flags; + int ret; + + ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg); + if (!ret) { + common_flags = soc_mbus_config_compatible(&cfg, + ISI_BUS_PARAM); + if (!common_flags) { + dev_warn(icd->parent, + "Flags incompatible: camera 0x%x, host 0x%x\n", + cfg.flags, ISI_BUS_PARAM); + return -EINVAL; + } + } else if (ret != -ENOIOCTLCMD) { + return ret; + } + + if ((1 << (buswidth - 1)) & isi->width_flags) + return 0; + return -EINVAL; +} + + +static int isi_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); + int formats = 0, ret; + /* sensor format */ + enum v4l2_mbus_pixelcode code; + /* soc camera host format */ + 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(icd->parent, + "Invalid format code #%u: %d\n", idx, code); + return 0; + } + + /* This also checks support for the requested bits-per-sample */ + ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample); + if (ret < 0) { + dev_err(icd->parent, + "Fail to try the bus parameters.\n"); + return 0; + } + + switch (code) { + case V4L2_MBUS_FMT_UYVY8_2X8: + case V4L2_MBUS_FMT_VYUY8_2X8: + case V4L2_MBUS_FMT_YUYV8_2X8: + case V4L2_MBUS_FMT_YVYU8_2X8: + formats++; + if (xlate) { + xlate->host_fmt = &isi_camera_formats[0]; + xlate->code = code; + xlate++; + dev_dbg(icd->parent, "Providing format %s using code %d\n", + isi_camera_formats[0].name, code); + } + break; + default: + if (!isi_camera_packing_supported(fmt)) + return 0; + if (xlate) + dev_dbg(icd->parent, + "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; +} + +/* Called with .video_lock held */ +static int isi_camera_add_device(struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct atmel_isi *isi = ici->priv; + int ret; + + if (isi->icd) + return -EBUSY; + + ret = clk_enable(isi->pclk); + if (ret) + return ret; + + ret = clk_enable(isi->mck); + if (ret) { + clk_disable(isi->pclk); + return ret; + } + + isi->icd = icd; + dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n", + icd->devnum); + return 0; +} +/* Called with .video_lock held */ +static void isi_camera_remove_device(struct soc_camera_device *icd) +{ + struct soc_camera_host *ici = to_soc_camera_host(icd->parent); + struct atmel_isi *isi = ici->priv; + + BUG_ON(icd != isi->icd); + + clk_disable(isi->mck); + clk_disable(isi->pclk); + isi->icd = NULL; + + dev_dbg(icd->parent, "Atmel ISI Camera driver detached from camera %d\n", + icd->devnum); +} + +static unsigned int isi_camera_poll(struct file *file, poll_table *pt) +{ + struct soc_camera_device *icd = file->private_data; + + return vb2_poll(&icd->vb2_vidq, file, pt); +} + +static int isi_camera_querycap(struct soc_camera_host *ici, + struct v4l2_capability *cap) +{ + strcpy(cap->driver, "atmel-isi"); + strcpy(cap->card, "Atmel Image Sensor Interface"); + cap->capabilities = (V4L2_CAP_VIDEO_CAPTURE | + V4L2_CAP_STREAMING); + return 0; +} + +static int isi_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 atmel_isi *isi = ici->priv; + struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,}; + unsigned long common_flags; + int ret; + u32 cfg1 = 0; + + ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg); + if (!ret) { + common_flags = soc_mbus_config_compatible(&cfg, + ISI_BUS_PARAM); + if (!common_flags) { + dev_warn(icd->parent, + "Flags incompatible: camera 0x%x, host 0x%x\n", + cfg.flags, ISI_BUS_PARAM); + return -EINVAL; + } + } else if (ret != -ENOIOCTLCMD) { + return ret; + } else { + common_flags = ISI_BUS_PARAM; + } + dev_dbg(icd->parent, "Flags cam: 0x%x host: 0x%x common: 0x%lx\n", + cfg.flags, ISI_BUS_PARAM, common_flags); + + /* Make choises, based on platform preferences */ + if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) && + (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) { + if (isi->pdata->hsync_act_low) + 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 (isi->pdata->vsync_act_low) + 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 (isi->pdata->pclk_act_falling) + 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; + } + + /* set bus param for ISI */ + if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW) + cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW; + if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW) + cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW; + if (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING) + cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING; + + if (isi->pdata->has_emb_sync) + cfg1 |= ISI_CFG1_EMB_SYNC; + if (isi->pdata->full_mode) + cfg1 |= ISI_CFG1_FULL_MODE; + + isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); + isi_writel(isi, ISI_CFG1, cfg1); + + return 0; +} + +static struct soc_camera_host_ops isi_soc_camera_host_ops = { + .owner = THIS_MODULE, + .add = isi_camera_add_device, + .remove = isi_camera_remove_device, + .set_fmt = isi_camera_set_fmt, + .try_fmt = isi_camera_try_fmt, + .get_formats = isi_camera_get_formats, + .init_videobuf2 = isi_camera_init_videobuf, + .poll = isi_camera_poll, + .querycap = isi_camera_querycap, + .set_bus_param = isi_camera_set_bus_param, +}; + +/* -----------------------------------------------------------------------*/ +static int __devexit atmel_isi_remove(struct platform_device *pdev) +{ + struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev); + struct atmel_isi *isi = container_of(soc_host, + struct atmel_isi, soc_host); + + free_irq(isi->irq, isi); + soc_camera_host_unregister(soc_host); + vb2_dma_contig_cleanup_ctx(isi->alloc_ctx); + dma_free_coherent(&pdev->dev, + sizeof(struct fbd) * MAX_BUFFER_NUM, + isi->p_fb_descriptors, + isi->fb_descriptors_phys); + + iounmap(isi->regs); + clk_unprepare(isi->mck); + clk_put(isi->mck); + clk_unprepare(isi->pclk); + clk_put(isi->pclk); + kfree(isi); + + return 0; +} + +static int __devinit atmel_isi_probe(struct platform_device *pdev) +{ + unsigned int irq; + struct atmel_isi *isi; + struct clk *pclk; + struct resource *regs; + int ret, i; + struct device *dev = &pdev->dev; + struct soc_camera_host *soc_host; + struct isi_platform_data *pdata; + + pdata = dev->platform_data; + if (!pdata || !pdata->data_width_flags || !pdata->mck_hz) { + dev_err(&pdev->dev, + "No config available for Atmel ISI\n"); + return -EINVAL; + } + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!regs) + return -ENXIO; + + pclk = clk_get(&pdev->dev, "isi_clk"); + if (IS_ERR(pclk)) + return PTR_ERR(pclk); + + ret = clk_prepare(pclk); + if (ret) + goto err_clk_prepare_pclk; + + isi = kzalloc(sizeof(struct atmel_isi), GFP_KERNEL); + if (!isi) { + ret = -ENOMEM; + dev_err(&pdev->dev, "Can't allocate interface!\n"); + goto err_alloc_isi; + } + + isi->pclk = pclk; + isi->pdata = pdata; + isi->active = NULL; + spin_lock_init(&isi->lock); + init_waitqueue_head(&isi->vsync_wq); + INIT_LIST_HEAD(&isi->video_buffer_list); + INIT_LIST_HEAD(&isi->dma_desc_head); + + /* Get ISI_MCK, provided by programmable clock or external clock */ + isi->mck = clk_get(dev, "isi_mck"); + if (IS_ERR(isi->mck)) { + dev_err(dev, "Failed to get isi_mck\n"); + ret = PTR_ERR(isi->mck); + goto err_clk_get; + } + + ret = clk_prepare(isi->mck); + if (ret) + goto err_clk_prepare_mck; + + /* Set ISI_MCK's frequency, it should be faster than pixel clock */ + ret = clk_set_rate(isi->mck, pdata->mck_hz); + if (ret < 0) + goto err_set_mck_rate; + + isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev, + sizeof(struct fbd) * MAX_BUFFER_NUM, + &isi->fb_descriptors_phys, + GFP_KERNEL); + if (!isi->p_fb_descriptors) { + ret = -ENOMEM; + dev_err(&pdev->dev, "Can't allocate descriptors!\n"); + goto err_alloc_descriptors; + } + + for (i = 0; i < MAX_BUFFER_NUM; i++) { + isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i; + isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys + + i * sizeof(struct fbd); + list_add(&isi->dma_desc[i].list, &isi->dma_desc_head); + } + + isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev); + if (IS_ERR(isi->alloc_ctx)) { + ret = PTR_ERR(isi->alloc_ctx); + goto err_alloc_ctx; + } + + isi->regs = ioremap(regs->start, resource_size(regs)); + if (!isi->regs) { + ret = -ENOMEM; + goto err_ioremap; + } + + if (pdata->data_width_flags & ISI_DATAWIDTH_8) + isi->width_flags = 1 << 7; + if (pdata->data_width_flags & ISI_DATAWIDTH_10) + isi->width_flags |= 1 << 9; + + isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + goto err_req_irq; + } + + ret = request_irq(irq, isi_interrupt, 0, "isi", isi); + if (ret) { + dev_err(&pdev->dev, "Unable to request irq %d\n", irq); + goto err_req_irq; + } + isi->irq = irq; + + soc_host = &isi->soc_host; + soc_host->drv_name = "isi-camera"; + soc_host->ops = &isi_soc_camera_host_ops; + soc_host->priv = isi; + soc_host->v4l2_dev.dev = &pdev->dev; + soc_host->nr = pdev->id; + + ret = soc_camera_host_register(soc_host); + if (ret) { + dev_err(&pdev->dev, "Unable to register soc camera host\n"); + goto err_register_soc_camera_host; + } + return 0; + +err_register_soc_camera_host: + free_irq(isi->irq, isi); +err_req_irq: + iounmap(isi->regs); +err_ioremap: + vb2_dma_contig_cleanup_ctx(isi->alloc_ctx); +err_alloc_ctx: + dma_free_coherent(&pdev->dev, + sizeof(struct fbd) * MAX_BUFFER_NUM, + isi->p_fb_descriptors, + isi->fb_descriptors_phys); +err_alloc_descriptors: +err_set_mck_rate: + clk_unprepare(isi->mck); +err_clk_prepare_mck: + clk_put(isi->mck); +err_clk_get: + kfree(isi); +err_alloc_isi: + clk_unprepare(pclk); +err_clk_prepare_pclk: + clk_put(pclk); + + return ret; +} + +static struct platform_driver atmel_isi_driver = { + .probe = atmel_isi_probe, + .remove = __devexit_p(atmel_isi_remove), + .driver = { + .name = "atmel_isi", + .owner = THIS_MODULE, + }, +}; + +static int __init atmel_isi_init_module(void) +{ + return platform_driver_probe(&atmel_isi_driver, &atmel_isi_probe); +} + +static void __exit atmel_isi_exit(void) +{ + platform_driver_unregister(&atmel_isi_driver); +} +module_init(atmel_isi_init_module); +module_exit(atmel_isi_exit); + +MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>"); +MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux"); +MODULE_LICENSE("GPL"); +MODULE_SUPPORTED_DEVICE("video"); 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