/*
   *  Driver for the Conexant CX23885 PCIe bridge
   *

   *  Copyright (c) 2007 Steven Toth <stoth@linuxtv.org>

   *
   *  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.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program; if not, write to the Free Software
   *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  #include <linux/init.h>
  #include <linux/slab.h>
  
  #include "cx23885.h"
  
  static unsigned int vbibufs = 4;
  module_param(vbibufs, int, 0644);
  MODULE_PARM_DESC(vbibufs, "number of vbi buffers, range 2-32");

  static unsigned int vbi_debug;

  module_param(vbi_debug, int, 0644);
  MODULE_PARM_DESC(vbi_debug, "enable debug messages [vbi]");

  #define dprintk(level, fmt, arg...)\
  	do { if (vbi_debug >= level)\
  		printk(KERN_DEBUG "%s/0: " fmt, dev->name, ## arg);\
  	} while (0)

  
  /* ------------------------------------------------------------------ */
  
  int cx23885_vbi_fmt(struct file *file, void *priv,
  	struct v4l2_format *f)
  {
  	struct cx23885_fh *fh = priv;
  	struct cx23885_dev *dev = fh->dev;
  
  	if (dev->tvnorm & V4L2_STD_525_60) {
  		/* ntsc */
  		f->fmt.vbi.sampling_rate = 28636363;
  		f->fmt.vbi.start[0] = 10;
  		f->fmt.vbi.start[1] = 273;
  
  	} else if (dev->tvnorm & V4L2_STD_625_50) {
  		/* pal */
  		f->fmt.vbi.sampling_rate = 35468950;
  		f->fmt.vbi.start[0] = 7 - 1;
  		f->fmt.vbi.start[1] = 319 - 1;
  	}
  	return 0;
  }
  
  static int cx23885_start_vbi_dma(struct cx23885_dev    *dev,
  			 struct cx23885_dmaqueue *q,
  			 struct cx23885_buffer   *buf)
  {
  	/* setup fifo + format */
  	cx23885_sram_channel_setup(dev, &dev->sram_channels[SRAM_CH02],
  				buf->vb.width, buf->risc.dma);
  
  	/* reset counter */
  	q->count = 1;
  
  	/* enable irqs */
  	cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | 0x01);
  	cx_set(VID_A_INT_MSK, 0x000022);
  
  	/* start dma */
  	cx_set(DEV_CNTRL2, (1<<5));
  	cx_set(VID_A_DMA_CTL, 0x00000022);
  
  	return 0;
  }

  static int cx23885_restart_vbi_queue(struct cx23885_dev    *dev,

  			     struct cx23885_dmaqueue *q)
  {
  	struct cx23885_buffer *buf;
  	struct list_head *item;
  
  	if (list_empty(&q->active))
  		return 0;
  
  	buf = list_entry(q->active.next, struct cx23885_buffer, vb.queue);
  	dprintk(2, "restart_queue [%p/%d]: restart dma
  ",
  		buf, buf->vb.i);
  	cx23885_start_vbi_dma(dev, q, buf);
  	list_for_each(item, &q->active) {
  		buf = list_entry(item, struct cx23885_buffer, vb.queue);
  		buf->count = q->count++;
  	}
  	mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
  	return 0;
  }
  
  void cx23885_vbi_timeout(unsigned long data)
  {
  	struct cx23885_dev *dev = (struct cx23885_dev *)data;
  	struct cx23885_dmaqueue *q = &dev->vbiq;
  	struct cx23885_buffer *buf;
  	unsigned long flags;
  
  	cx23885_sram_channel_dump(dev, &dev->sram_channels[SRAM_CH02]);
  
  	cx_clear(VID_A_DMA_CTL, 0x22);
  
  	spin_lock_irqsave(&dev->slock, flags);
  	while (!list_empty(&q->active)) {
  		buf = list_entry(q->active.next, struct cx23885_buffer,
  			vb.queue);
  		list_del(&buf->vb.queue);
  		buf->vb.state = VIDEOBUF_ERROR;
  		wake_up(&buf->vb.done);
  		printk("%s/0: [%p/%d] timeout - dma=0x%08lx
  ", dev->name,
  		       buf, buf->vb.i, (unsigned long)buf->risc.dma);
  	}
  	cx23885_restart_vbi_queue(dev, q);
  	spin_unlock_irqrestore(&dev->slock, flags);
  }
  
  /* ------------------------------------------------------------------ */
  #define VBI_LINE_LENGTH 2048
  #define VBI_LINE_COUNT 17
  
  static int
  vbi_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
  {
  	*size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
  	if (0 == *count)
  		*count = vbibufs;
  	if (*count < 2)
  		*count = 2;
  	if (*count > 32)
  		*count = 32;
  	return 0;
  }
  
  static int
  vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
  	    enum v4l2_field field)
  {
  	struct cx23885_fh *fh  = q->priv_data;
  	struct cx23885_dev *dev = fh->dev;
  	struct cx23885_buffer *buf = container_of(vb,
  		struct cx23885_buffer, vb);
  	struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
  	unsigned int size;
  	int rc;
  
  	size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
  	if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
  		return -EINVAL;
  
  	if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
  		buf->vb.width  = VBI_LINE_LENGTH;
  		buf->vb.height = VBI_LINE_COUNT;
  		buf->vb.size   = size;
  		buf->vb.field  = V4L2_FIELD_SEQ_TB;
  
  		rc = videobuf_iolock(q, &buf->vb, NULL);
  		if (0 != rc)
  			goto fail;
  		cx23885_risc_buffer(dev->pci, &buf->risc,
  				 dma->sglist,
  				 0, buf->vb.width * buf->vb.height,
  				 buf->vb.width, 0,
  				 buf->vb.height);
  	}
  	buf->vb.state = VIDEOBUF_PREPARED;
  	return 0;
  
   fail:
  	cx23885_free_buffer(q, buf);
  	return rc;
  }
  
  static void
  vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
  {
  	struct cx23885_buffer   *buf =
  		container_of(vb, struct cx23885_buffer, vb);
  	struct cx23885_buffer   *prev;
  	struct cx23885_fh       *fh   = vq->priv_data;
  	struct cx23885_dev      *dev  = fh->dev;
  	struct cx23885_dmaqueue *q    = &dev->vbiq;
  
  	/* add jump to stopper */
  	buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
  	buf->risc.jmp[1] = cpu_to_le32(q->stopper.dma);
  	buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
  
  	if (list_empty(&q->active)) {
  		list_add_tail(&buf->vb.queue, &q->active);
  		cx23885_start_vbi_dma(dev, q, buf);
  		buf->vb.state = VIDEOBUF_ACTIVE;
  		buf->count    = q->count++;
  		mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
  		dprintk(2, "[%p/%d] vbi_queue - first active
  ",
  			buf, buf->vb.i);
  
  	} else {
  		prev = list_entry(q->active.prev, struct cx23885_buffer,
  			vb.queue);
  		list_add_tail(&buf->vb.queue, &q->active);
  		buf->vb.state = VIDEOBUF_ACTIVE;
  		buf->count    = q->count++;
  		prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
  		prev->risc.jmp[2] = cpu_to_le32(0); /* Bits 63-32 */
  		dprintk(2, "[%p/%d] buffer_queue - append to active
  ",
  			buf, buf->vb.i);
  	}
  }
  
  static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
  {
  	struct cx23885_buffer *buf =
  		container_of(vb, struct cx23885_buffer, vb);
  
  	cx23885_free_buffer(q, buf);
  }
  
  struct videobuf_queue_ops cx23885_vbi_qops = {
  	.buf_setup    = vbi_setup,
  	.buf_prepare  = vbi_prepare,
  	.buf_queue    = vbi_queue,
  	.buf_release  = vbi_release,
  };
  
  /* ------------------------------------------------------------------ */
  /*
   * Local variables:
   * c-basic-offset: 8
   * End:
   */