/*
 * Copyright 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

/*!
 * @file ipu_prp_vf_sdc.c
 *
 * @brief IPU Use case for PRP-VF
 *
 * @ingroup IPU
 */

#include <linux/dma-mapping.h>
#include <linux/console.h>
#include <linux/ipu.h>
#include <linux/mxcfb.h>
#include <mach/hardware.h>
#include "mxc_v4l2_capture.h"
#include "ipu_prp_sw.h"

#define OVERLAY_FB_SUPPORT_NONSTD	(cpu_is_mx51_rev(CHIP_REV_2_0) >= 1)

/*
 * Function definitions
 */

/*!
 * prpvf_start - start the vf task
 *
 * @param private    cam_data * mxc v4l2 main structure
 *
 */
static int prpvf_start(void *private)
{
	struct fb_var_screeninfo fbvar;
	struct fb_info *fbi = NULL;
	cam_data *cam = (cam_data *) private;
	ipu_channel_params_t vf;
	u32 vf_out_format = 0;
	u32 size = 2, temp = 0;
	int err = 0, i = 0;

	if (!cam) {
		printk(KERN_ERR "private is NULL\n");
		return -EIO;
	}

	if (cam->overlay_active == true) {
		pr_debug("already started.\n");
		return 0;
	}

	for (i = 0; i < num_registered_fb; i++) {
		char *idstr = registered_fb[i]->fix.id;
		if (strcmp(idstr, "DISP3 FG") == 0) {
			fbi = registered_fb[i];
			break;
		}
	}

	if (fbi == NULL) {
		printk(KERN_ERR "DISP3 FG fb not found\n");
		return -EPERM;
	}

	fbvar = fbi->var;

	/* Store the overlay frame buffer's original std */
	cam->fb_origin_std = fbvar.nonstd;

	if (OVERLAY_FB_SUPPORT_NONSTD) {
		/* Use DP to do CSC so that we can get better performance */
		vf_out_format = IPU_PIX_FMT_UYVY;
		fbvar.nonstd = vf_out_format;
	} else {
		vf_out_format = IPU_PIX_FMT_RGB565;
		fbvar.nonstd = 0;
	}

	fbvar.bits_per_pixel = 16;
	fbvar.xres = fbvar.xres_virtual = cam->win.w.width;
	fbvar.yres = cam->win.w.height;
	fbvar.yres_virtual = cam->win.w.height * 2;
	fbvar.activate |= FB_ACTIVATE_FORCE;
	fb_set_var(fbi, &fbvar);

	ipu_disp_set_window_pos(MEM_FG_SYNC, cam->win.w.left,
			cam->win.w.top);

	acquire_console_sem();
	fb_blank(fbi, FB_BLANK_UNBLANK);
	release_console_sem();

	memset(&vf, 0, sizeof(ipu_channel_params_t));
	ipu_csi_get_window_size(&vf.csi_prp_vf_mem.in_width,
				&vf.csi_prp_vf_mem.in_height, cam->csi);
	vf.csi_prp_vf_mem.in_pixel_fmt = IPU_PIX_FMT_UYVY;
	vf.csi_prp_vf_mem.out_width = cam->win.w.width;
	vf.csi_prp_vf_mem.out_height = cam->win.w.height;
	vf.csi_prp_vf_mem.csi = cam->csi;
	if (cam->vf_rotation >= IPU_ROTATE_90_RIGHT) {
		vf.csi_prp_vf_mem.out_width = cam->win.w.height;
		vf.csi_prp_vf_mem.out_height = cam->win.w.width;
	}
	vf.csi_prp_vf_mem.out_pixel_fmt = vf_out_format;
	size = cam->win.w.width * cam->win.w.height * size;

	err = ipu_init_channel(CSI_PRP_VF_MEM, &vf);
	if (err != 0)
		goto out_5;

	ipu_csi_enable_mclk_if(CSI_MCLK_VF, cam->csi, true, true);

	if (cam->vf_bufs_vaddr[0]) {
		dma_free_coherent(0, cam->vf_bufs_size[0],
				  cam->vf_bufs_vaddr[0],
				  (dma_addr_t) cam->vf_bufs[0]);
	}
	if (cam->vf_bufs_vaddr[1]) {
		dma_free_coherent(0, cam->vf_bufs_size[1],
				  cam->vf_bufs_vaddr[1],
				  (dma_addr_t) cam->vf_bufs[1]);
	}
	cam->vf_bufs_size[0] = PAGE_ALIGN(size);
	cam->vf_bufs_vaddr[0] = (void *)dma_alloc_coherent(0,
							   cam->vf_bufs_size[0],
							   (dma_addr_t *) &
							   cam->vf_bufs[0],
							   GFP_DMA |
							   GFP_KERNEL);
	if (cam->vf_bufs_vaddr[0] == NULL) {
		printk(KERN_ERR "Error to allocate vf buffer\n");
		err = -ENOMEM;
		goto out_4;
	}
	cam->vf_bufs_size[1] = PAGE_ALIGN(size);
	cam->vf_bufs_vaddr[1] = (void *)dma_alloc_coherent(0,
							   cam->vf_bufs_size[1],
							   (dma_addr_t *) &
							   cam->vf_bufs[1],
							   GFP_DMA |
							   GFP_KERNEL);
	if (cam->vf_bufs_vaddr[1] == NULL) {
		printk(KERN_ERR "Error to allocate vf buffer\n");
		err = -ENOMEM;
		goto out_3;
	}
	pr_debug("vf_bufs %x %x\n", cam->vf_bufs[0], cam->vf_bufs[1]);

	if (cam->vf_rotation >= IPU_ROTATE_VERT_FLIP) {
		err = ipu_init_channel_buffer(CSI_PRP_VF_MEM, IPU_OUTPUT_BUFFER,
					      vf_out_format,
					      vf.csi_prp_vf_mem.out_width,
					      vf.csi_prp_vf_mem.out_height,
					      vf.csi_prp_vf_mem.out_width,
					      IPU_ROTATE_NONE, cam->vf_bufs[0],
					      cam->vf_bufs[1], 0, 0);
		if (err != 0) {
			goto out_3;
		}

		err = ipu_init_channel(MEM_ROT_VF_MEM, NULL);
		if (err != 0) {
			printk(KERN_ERR "Error MEM_ROT_VF_MEM channel\n");
			goto out_3;
		}

		err = ipu_init_channel_buffer(MEM_ROT_VF_MEM, IPU_INPUT_BUFFER,
					      vf_out_format,
					      vf.csi_prp_vf_mem.out_width,
					      vf.csi_prp_vf_mem.out_height,
					      vf.csi_prp_vf_mem.out_width,
					      cam->vf_rotation, cam->vf_bufs[0],
					      cam->vf_bufs[1], 0, 0);
		if (err != 0) {
			printk(KERN_ERR "Error MEM_ROT_VF_MEM input buffer\n");
			goto out_2;
		}

		if (cam->vf_rotation < IPU_ROTATE_90_RIGHT) {
			temp = vf.csi_prp_vf_mem.out_width;
			vf.csi_prp_vf_mem.out_width =
						vf.csi_prp_vf_mem.out_height;
			vf.csi_prp_vf_mem.out_height = temp;
		}

		err = ipu_init_channel_buffer(MEM_ROT_VF_MEM, IPU_OUTPUT_BUFFER,
					      vf_out_format,
					      vf.csi_prp_vf_mem.out_height,
					      vf.csi_prp_vf_mem.out_width,
					      vf.csi_prp_vf_mem.out_height,
					      IPU_ROTATE_NONE,
					      fbi->fix.smem_start +
					      (fbi->fix.line_length *
					       fbi->var.yres),
					      fbi->fix.smem_start, 0, 0);

		if (err != 0) {
			printk(KERN_ERR "Error MEM_ROT_VF_MEM output buffer\n");
			goto out_2;
		}

		err = ipu_link_channels(CSI_PRP_VF_MEM, MEM_ROT_VF_MEM);
		if (err < 0) {
			printk(KERN_ERR
			       "Error link CSI_PRP_VF_MEM-MEM_ROT_VF_MEM\n");
			goto out_2;
		}

		err = ipu_link_channels(MEM_ROT_VF_MEM, MEM_FG_SYNC);
		if (err < 0) {
			printk(KERN_ERR
			       "Error link MEM_ROT_VF_MEM-MEM_FG_SYNC\n");
			goto out_1;
		}

		ipu_enable_channel(CSI_PRP_VF_MEM);
		ipu_enable_channel(MEM_ROT_VF_MEM);

		ipu_select_buffer(CSI_PRP_VF_MEM, IPU_OUTPUT_BUFFER, 0);
		ipu_select_buffer(CSI_PRP_VF_MEM, IPU_OUTPUT_BUFFER, 1);
		ipu_select_buffer(MEM_ROT_VF_MEM, IPU_OUTPUT_BUFFER, 0);
		ipu_select_buffer(MEM_ROT_VF_MEM, IPU_OUTPUT_BUFFER, 1);
	} else {
		err = ipu_init_channel_buffer(CSI_PRP_VF_MEM, IPU_OUTPUT_BUFFER,
					      vf_out_format, cam->win.w.width,
					      cam->win.w.height,
					      cam->win.w.width,
					      cam->vf_rotation,
					      fbi->fix.smem_start +
					      (fbi->fix.line_length *
					       fbi->var.yres),
					      fbi->fix.smem_start, 0, 0);
		if (err != 0) {
			printk(KERN_ERR "Error initializing CSI_PRP_VF_MEM\n");
			goto out_4;
		}

		err = ipu_link_channels(CSI_PRP_VF_MEM, MEM_FG_SYNC);
		if (err < 0) {
			printk(KERN_ERR "Error linking ipu channels\n");
			goto out_4;
		}

		ipu_enable_channel(CSI_PRP_VF_MEM);

		ipu_select_buffer(CSI_PRP_VF_MEM, IPU_OUTPUT_BUFFER, 0);
		ipu_select_buffer(CSI_PRP_VF_MEM, IPU_OUTPUT_BUFFER, 1);
	}

	cam->overlay_active = true;
	return err;

out_1:
	ipu_unlink_channels(CSI_PRP_VF_MEM, MEM_ROT_VF_MEM);
out_2:
	if (cam->vf_rotation >= IPU_ROTATE_VERT_FLIP) {
		ipu_uninit_channel(MEM_ROT_VF_MEM);
	}
out_3:
	if (cam->vf_bufs_vaddr[0]) {
		dma_free_coherent(0, cam->vf_bufs_size[0],
				  cam->vf_bufs_vaddr[0],
				  (dma_addr_t) cam->vf_bufs[0]);
		cam->vf_bufs_vaddr[0] = NULL;
		cam->vf_bufs[0] = 0;
	}
	if (cam->vf_bufs_vaddr[1]) {
		dma_free_coherent(0, cam->vf_bufs_size[1],
				  cam->vf_bufs_vaddr[1],
				  (dma_addr_t) cam->vf_bufs[1]);
		cam->vf_bufs_vaddr[1] = NULL;
		cam->vf_bufs[1] = 0;
	}
out_4:
	ipu_uninit_channel(CSI_PRP_VF_MEM);
out_5:
	return err;
}

/*!
 * prpvf_stop - stop the vf task
 *
 * @param private    cam_data * mxc v4l2 main structure
 *
 */
static int prpvf_stop(void *private)
{
	cam_data *cam = (cam_data *) private;
	int err = 0, i = 0;
	struct fb_info *fbi = NULL;
	struct fb_var_screeninfo fbvar;

	if (cam->overlay_active == false)
		return 0;

	for (i = 0; i < num_registered_fb; i++) {
		char *idstr = registered_fb[i]->fix.id;
		if (strcmp(idstr, "DISP3 FG") == 0) {
			fbi = registered_fb[i];
			break;
		}
	}

	if (fbi == NULL) {
		printk(KERN_ERR "DISP3 FG fb not found\n");
		return -EPERM;
	}

	ipu_disp_set_window_pos(MEM_FG_SYNC, 0, 0);

	if (cam->vf_rotation >= IPU_ROTATE_VERT_FLIP) {
		ipu_unlink_channels(CSI_PRP_VF_MEM, MEM_ROT_VF_MEM);
		ipu_unlink_channels(MEM_ROT_VF_MEM, MEM_FG_SYNC);
	} else {
		ipu_unlink_channels(CSI_PRP_VF_MEM, MEM_FG_SYNC);
	}

	ipu_disable_channel(CSI_PRP_VF_MEM, true);

	if (cam->vf_rotation >= IPU_ROTATE_VERT_FLIP) {
		ipu_disable_channel(MEM_ROT_VF_MEM, true);
		ipu_uninit_channel(MEM_ROT_VF_MEM);
	}
	ipu_uninit_channel(CSI_PRP_VF_MEM);

	acquire_console_sem();
	fb_blank(fbi, FB_BLANK_POWERDOWN);
	release_console_sem();

	/* Set the overlay frame buffer std to what it is used to be */
	fbvar = fbi->var;
	fbvar.nonstd = cam->fb_origin_std;
	fbvar.activate |= FB_ACTIVATE_FORCE;
	fb_set_var(fbi, &fbvar);

	ipu_csi_enable_mclk_if(CSI_MCLK_VF, cam->csi, false, false);

	if (cam->vf_bufs_vaddr[0]) {
		dma_free_coherent(0, cam->vf_bufs_size[0],
				  cam->vf_bufs_vaddr[0],
				  (dma_addr_t) cam->vf_bufs[0]);
		cam->vf_bufs_vaddr[0] = NULL;
		cam->vf_bufs[0] = 0;
	}
	if (cam->vf_bufs_vaddr[1]) {
		dma_free_coherent(0, cam->vf_bufs_size[1],
				  cam->vf_bufs_vaddr[1],
				  (dma_addr_t) cam->vf_bufs[1]);
		cam->vf_bufs_vaddr[1] = NULL;
		cam->vf_bufs[1] = 0;
	}

	cam->overlay_active = false;
	return err;
}

/*!
 * Enable csi
 * @param private       struct cam_data * mxc capture instance
 *
 * @return  status
 */
static int prp_vf_enable_csi(void *private)
{
	cam_data *cam = (cam_data *) private;

	return ipu_enable_csi(cam->csi);
}

/*!
 * Disable csi
 * @param private       struct cam_data * mxc capture instance
 *
 * @return  status
 */
static int prp_vf_disable_csi(void *private)
{
	cam_data *cam = (cam_data *) private;

	return ipu_disable_csi(cam->csi);
}

/*!
 * function to select PRP-VF as the working path
 *
 * @param private    cam_data * mxc v4l2 main structure
 *
 * @return  status
 */
int prp_vf_sdc_select(void *private)
{
	cam_data *cam;
	int err = 0;
	if (private) {
		cam = (cam_data *) private;
		cam->vf_start_sdc = prpvf_start;
		cam->vf_stop_sdc = prpvf_stop;
		cam->vf_enable_csi = prp_vf_enable_csi;
		cam->vf_disable_csi = prp_vf_disable_csi;
		cam->overlay_active = false;
	} else
		err = -EIO;

	return err;
}

/*!
 * function to de-select PRP-VF as the working path
 *
 * @param private    cam_data * mxc v4l2 main structure
 *
 * @return  int
 */
int prp_vf_sdc_deselect(void *private)
{
	cam_data *cam;
	int err = 0;
	err = prpvf_stop(private);

	if (private) {
		cam = (cam_data *) private;
		cam->vf_start_sdc = NULL;
		cam->vf_stop_sdc = NULL;
		cam->vf_enable_csi = NULL;
		cam->vf_disable_csi = NULL;
	}
	return err;
}

/*!
 * Init viewfinder task.
 *
 * @return  Error code indicating success or failure
 */
__init int prp_vf_sdc_init(void)
{
	return 0;
}

/*!
 * Deinit viewfinder task.
 *
 * @return  Error code indicating success or failure
 */
void __exit prp_vf_sdc_exit(void)
{
}

module_init(prp_vf_sdc_init);
module_exit(prp_vf_sdc_exit);

EXPORT_SYMBOL(prp_vf_sdc_select);
EXPORT_SYMBOL(prp_vf_sdc_deselect);

MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("IPU PRP VF SDC Driver");
MODULE_LICENSE("GPL");