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/*

 * Copyright © 2007 David Airlie

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

 * DEALINGS IN THE SOFTWARE.

 *

 * Authors:

 *     David Airlie

 */

#include 

#include 

#include 

#include 

#include 

//#include 

//#include 

#include 

#include 

#include 

//#include 

//#include 

#include 

#include 

#include 

#include "intel_drv.h"

#include 

#include "i915_drv.h"

struct fb_info *framebuffer_alloc(size_t size, struct device *dev)

{

#define BYTES_PER_LONG (BITS_PER_LONG/8)

#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))

    int fb_info_size = sizeof(struct fb_info);

    struct fb_info *info;

    char *p;

    if (size)

        fb_info_size += PADDING;

    p = kzalloc(fb_info_size + size, GFP_KERNEL);

    if (!p)

        return NULL;

    info = (struct fb_info *) p;

    if (size)

        info->par = p + fb_info_size;

    return info;

#undef PADDING

#undef BYTES_PER_LONG

}

static int intel_fbdev_set_par(struct fb_info *info)

{

	struct drm_fb_helper *fb_helper = info->par;

	struct intel_fbdev *ifbdev =

		container_of(fb_helper, struct intel_fbdev, helper);

	int ret;

	ret = drm_fb_helper_set_par(info);

	if (ret == 0) {

		/*

		 * FIXME: fbdev presumes that all callbacks also work from

		 * atomic contexts and relies on that for emergency oops

		 * printing. KMS totally doesn't do that and the locking here is

		 * by far not the only place this goes wrong.  Ignore this for

		 * now until we solve this for real.

		 */

		mutex_lock(&fb_helper->dev->struct_mutex);

		ret = i915_gem_object_set_to_gtt_domain(ifbdev->fb->obj,

							true);

		mutex_unlock(&fb_helper->dev->struct_mutex);

	}

	return ret;

}

static struct fb_ops intelfb_ops = {

	.owner = THIS_MODULE,

	.fb_check_var = drm_fb_helper_check_var,

	.fb_set_par = intel_fbdev_set_par,

//   .fb_fillrect = cfb_fillrect,

//   .fb_copyarea = cfb_copyarea,

//   .fb_imageblit = cfb_imageblit,

//   .fb_pan_display = drm_fb_helper_pan_display,

	.fb_blank = drm_fb_helper_blank,

//   .fb_setcmap = drm_fb_helper_setcmap,

//   .fb_debug_enter = drm_fb_helper_debug_enter,

//   .fb_debug_leave = drm_fb_helper_debug_leave,

};

static int intelfb_alloc(struct drm_fb_helper *helper,

			  struct drm_fb_helper_surface_size *sizes)

{

	struct intel_fbdev *ifbdev =

		container_of(helper, struct intel_fbdev, helper);

	struct drm_framebuffer *fb;

	struct drm_device *dev = helper->dev;

	struct drm_mode_fb_cmd2 mode_cmd = {};

	struct drm_i915_gem_object *obj;

	int size, ret;

	/* we don't do packed 24bpp */

	if (sizes->surface_bpp == 24)

		sizes->surface_bpp = 32;

	mode_cmd.width = sizes->surface_width;

	mode_cmd.height = sizes->surface_height;

	mode_cmd.pitches[0] = ALIGN(mode_cmd.width *

				    DIV_ROUND_UP(sizes->surface_bpp, 8), 64);

	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,

							  sizes->surface_depth);

	size = mode_cmd.pitches[0] * mode_cmd.height;

	size = ALIGN(size, PAGE_SIZE);

	obj = main_fb_obj;

    obj->stride = mode_cmd.pitches[0];

	if (!obj) {

		DRM_ERROR("failed to allocate framebuffer\n");

		ret = -ENOMEM;

		goto out;

	}

	fb = __intel_framebuffer_create(dev, &mode_cmd, obj);

	if (IS_ERR(fb)) {

		ret = PTR_ERR(fb);

		goto out_unref;

	}

	/* Flush everything out, we'll be doing GTT only from now on */

	ret = intel_pin_and_fence_fb_obj(NULL, fb, NULL);

	if (ret) {

		DRM_ERROR("failed to pin obj: %d\n", ret);

		goto out_fb;

	}

	ifbdev->fb = to_intel_framebuffer(fb);

	return 0;

out_fb:

	drm_framebuffer_remove(fb);

out_unref:

	drm_gem_object_unreference(&obj->base);

out:

	return ret;

}

static int intelfb_create(struct drm_fb_helper *helper,

			  struct drm_fb_helper_surface_size *sizes)

{

	struct intel_fbdev *ifbdev =

		container_of(helper, struct intel_fbdev, helper);

	struct intel_framebuffer *intel_fb = ifbdev->fb;

	struct drm_device *dev = helper->dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct fb_info *info;

	struct drm_framebuffer *fb;

	struct drm_i915_gem_object *obj;

	int size, ret;

	bool prealloc = false;

	mutex_lock(&dev->struct_mutex);

#if 0

	if (intel_fb &&

	    (sizes->fb_width > intel_fb->base.width ||

	     sizes->fb_height > intel_fb->base.height)) {

		DRM_DEBUG_KMS("BIOS fb too small (%dx%d), we require (%dx%d),"

			      " releasing it\n",

			      intel_fb->base.width, intel_fb->base.height,

			      sizes->fb_width, sizes->fb_height);

		drm_framebuffer_unreference(&intel_fb->base);

		intel_fb = ifbdev->fb = NULL;

	}

#endif

	if (!intel_fb || WARN_ON(!intel_fb->obj)) {

		DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");

		ret = intelfb_alloc(helper, sizes);

		if (ret)

			goto out_unlock;

		intel_fb = ifbdev->fb;

	} else {

		DRM_DEBUG_KMS("re-using BIOS fb\n");

		prealloc = true;

		sizes->fb_width = intel_fb->base.width;

		sizes->fb_height = intel_fb->base.height;

	}

	obj = intel_fb->obj;

	size = obj->base.size;

	info = framebuffer_alloc(0, &dev->pdev->dev);

	if (!info) {

		ret = -ENOMEM;

		goto out_unpin;

	}

	info->par = helper;

	fb = &ifbdev->fb->base;

	ifbdev->helper.fb = fb;

	ifbdev->helper.fbdev = info;

    strcpy(info->fix.id, "inteldrmfb");

    info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;

    info->fbops = &intelfb_ops;

    /* setup aperture base/size for vesafb takeover */

	info->apertures = alloc_apertures(1);

	if (!info->apertures) {

		ret = -ENOMEM;

		goto out_unpin;

	}

	info->apertures->ranges[0].base = dev->mode_config.fb_base;

	info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;

	info->screen_base = (void*) 0xFE000000;

	info->screen_size = size;

	/* This driver doesn't need a VT switch to restore the mode on resume */

	info->skip_vt_switch = true;

	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);

	drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);

	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */

	DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08lx, bo %p\n",

		      fb->width, fb->height,

		      i915_gem_obj_ggtt_offset(obj), obj);

	mutex_unlock(&dev->struct_mutex);

	return 0;

out_unpin:

	i915_gem_object_ggtt_unpin(obj);

	drm_gem_object_unreference(&obj->base);

out_unlock:

	mutex_unlock(&dev->struct_mutex);

	return ret;

}

/** Sets the color ramps on behalf of RandR */

static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,

				    u16 blue, int regno)

{

	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	intel_crtc->lut_r[regno] = red >> 8;

	intel_crtc->lut_g[regno] = green >> 8;

	intel_crtc->lut_b[regno] = blue >> 8;

}

static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,

				    u16 *blue, int regno)

{

	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	*red = intel_crtc->lut_r[regno] << 8;

	*green = intel_crtc->lut_g[regno] << 8;

	*blue = intel_crtc->lut_b[regno] << 8;

}

static struct drm_fb_helper_crtc *

intel_fb_helper_crtc(struct drm_fb_helper *fb_helper, struct drm_crtc *crtc)

{

	int i;

	for (i = 0; i < fb_helper->crtc_count; i++)

		if (fb_helper->crtc_info[i].mode_set.crtc == crtc)

			return &fb_helper->crtc_info[i];

	return NULL;

}

/*

 * Try to read the BIOS display configuration and use it for the initial

 * fb configuration.

 *

 * The BIOS or boot loader will generally create an initial display

 * configuration for us that includes some set of active pipes and displays.

 * This routine tries to figure out which pipes and connectors are active

 * and stuffs them into the crtcs and modes array given to us by the

 * drm_fb_helper code.

 *

 * The overall sequence is:

 *   intel_fbdev_init - from driver load

 *     intel_fbdev_init_bios - initialize the intel_fbdev using BIOS data

 *     drm_fb_helper_init - build fb helper structs

 *     drm_fb_helper_single_add_all_connectors - more fb helper structs

 *   intel_fbdev_initial_config - apply the config

 *     drm_fb_helper_initial_config - call ->probe then register_framebuffer()

 *         drm_setup_crtcs - build crtc config for fbdev

 *           intel_fb_initial_config - find active connectors etc

 *         drm_fb_helper_single_fb_probe - set up fbdev

 *           intelfb_create - re-use or alloc fb, build out fbdev structs

 *

 * Note that we don't make special consideration whether we could actually

 * switch to the selected modes without a full modeset. E.g. when the display

 * is in VGA mode we need to recalculate watermarks and set a new high-res

 * framebuffer anyway.

 */

static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,

				    struct drm_fb_helper_crtc **crtcs,

				    struct drm_display_mode **modes,

				    struct drm_fb_offset *offsets,

				    bool *enabled, int width, int height)

{

	struct drm_device *dev = fb_helper->dev;

	int i, j;

	bool *save_enabled;

	bool fallback = true;

	int num_connectors_enabled = 0;

	int num_connectors_detected = 0;

	uint64_t conn_configured = 0, mask;

	int pass = 0;

	save_enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool),

			       GFP_KERNEL);

	if (!save_enabled)

		return false;

	memcpy(save_enabled, enabled, dev->mode_config.num_connector);

	mask = (1 << fb_helper->connector_count) - 1;

retry:

	for (i = 0; i < fb_helper->connector_count; i++) {

		struct drm_fb_helper_connector *fb_conn;

		struct drm_connector *connector;

		struct drm_encoder *encoder;

		struct drm_fb_helper_crtc *new_crtc;

		fb_conn = fb_helper->connector_info[i];

		connector = fb_conn->connector;

		if (conn_configured & (1 << i))

			continue;

		if (pass == 0 && !connector->has_tile)

			continue;

		if (connector->status == connector_status_connected)

			num_connectors_detected++;

		if (!enabled[i]) {

			DRM_DEBUG_KMS("connector %s not enabled, skipping\n",

				      connector->name);

			conn_configured |= (1 << i);

			continue;

		}

		if (connector->force == DRM_FORCE_OFF) {

			DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",

				      connector->name);

			enabled[i] = false;

			continue;

		}

		encoder = connector->encoder;

		if (!encoder || WARN_ON(!encoder->crtc)) {

			if (connector->force > DRM_FORCE_OFF)

				goto bail;

			DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",

				      connector->name);

			enabled[i] = false;

			conn_configured |= (1 << i);

			continue;

		}

		num_connectors_enabled++;

		new_crtc = intel_fb_helper_crtc(fb_helper, encoder->crtc);

		/*

		 * Make sure we're not trying to drive multiple connectors

		 * with a single CRTC, since our cloning support may not

		 * match the BIOS.

		 */

		for (j = 0; j < fb_helper->connector_count; j++) {

			if (crtcs[j] == new_crtc) {

				DRM_DEBUG_KMS("fallback: cloned configuration\n");

				goto bail;

			}

		}

		DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",

			      connector->name);

		/* go for command line mode first */

		modes[i] = drm_pick_cmdline_mode(fb_conn, width, height);

		/* try for preferred next */

		if (!modes[i]) {

			DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",

				      connector->name, connector->has_tile);

			modes[i] = drm_has_preferred_mode(fb_conn, width,

							  height);

		}

		/* No preferred mode marked by the EDID? Are there any modes? */

		if (!modes[i] && !list_empty(&connector->modes)) {

			DRM_DEBUG_KMS("using first mode listed on connector %s\n",

				      connector->name);

			modes[i] = list_first_entry(&connector->modes,

						    struct drm_display_mode,

						    head);

		}

		/* last resort: use current mode */

		if (!modes[i]) {

			/*

			 * IMPORTANT: We want to use the adjusted mode (i.e.

			 * after the panel fitter upscaling) as the initial

			 * config, not the input mode, which is what crtc->mode

			 * usually contains. But since our current fastboot

			 * code puts a mode derived from the post-pfit timings

			 * into crtc->mode this works out correctly. We don't

			 * use hwmode anywhere right now, so use it for this

			 * since the fb helper layer wants a pointer to

			 * something we own.

			 */

			DRM_DEBUG_KMS("looking for current mode on connector %s\n",

				      connector->name);

			intel_mode_from_pipe_config(&encoder->crtc->hwmode,

						    &to_intel_crtc(encoder->crtc)->config);

			modes[i] = &encoder->crtc->hwmode;

		}

		crtcs[i] = new_crtc;

		DRM_DEBUG_KMS("connector %s on pipe %c [CRTC:%d]: %dx%d%s\n",

			      connector->name,

			      pipe_name(to_intel_crtc(encoder->crtc)->pipe),

			      encoder->crtc->base.id,

			      modes[i]->hdisplay, modes[i]->vdisplay,

			      modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" :"");

		fallback = false;

		conn_configured |= (1 << i);

	}

	if ((conn_configured & mask) != mask) {

		pass++;

		goto retry;

	}

	/*

	 * If the BIOS didn't enable everything it could, fall back to have the

	 * same user experiencing of lighting up as much as possible like the

	 * fbdev helper library.

	 */

	if (num_connectors_enabled != num_connectors_detected &&

	    num_connectors_enabled < INTEL_INFO(dev)->num_pipes) {

		DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");

		DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,

			      num_connectors_detected);

		fallback = true;

	}

	if (fallback) {

bail:

		DRM_DEBUG_KMS("Not using firmware configuration\n");

		memcpy(enabled, save_enabled, dev->mode_config.num_connector);

		kfree(save_enabled);

		return false;

	}

	kfree(save_enabled);

	return true;

}

static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {

	.initial_config = intel_fb_initial_config,

	.gamma_set = intel_crtc_fb_gamma_set,

	.gamma_get = intel_crtc_fb_gamma_get,

	.fb_probe = intelfb_create,

};

/*

 * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.

 * The core display code will have read out the current plane configuration,

 * so we use that to figure out if there's an object for us to use as the

 * fb, and if so, we re-use it for the fbdev configuration.

 *

 * Note we only support a single fb shared across pipes for boot (mostly for

 * fbcon), so we just find the biggest and use that.

 */

static bool intel_fbdev_init_bios(struct drm_device *dev,

				 struct intel_fbdev *ifbdev)

{

	struct intel_framebuffer *fb = NULL;

	struct drm_crtc *crtc;

	struct intel_crtc *intel_crtc;

	struct intel_plane_config *plane_config = NULL;

	unsigned int max_size = 0;

	if (!i915.fastboot)

		return false;

	/* Find the largest fb */

	for_each_crtc(dev, crtc) {

		intel_crtc = to_intel_crtc(crtc);

		if (!intel_crtc->active || !crtc->primary->fb) {

			DRM_DEBUG_KMS("pipe %c not active or no fb, skipping\n",

				      pipe_name(intel_crtc->pipe));

			continue;

		}

		if (intel_crtc->plane_config.size > max_size) {

			DRM_DEBUG_KMS("found possible fb from plane %c\n",

				      pipe_name(intel_crtc->pipe));

			plane_config = &intel_crtc->plane_config;

			fb = to_intel_framebuffer(crtc->primary->fb);

			max_size = plane_config->size;

		}

	}

	if (!fb) {

		DRM_DEBUG_KMS("no active fbs found, not using BIOS config\n");

		goto out;

	}

	/* Now make sure all the pipes will fit into it */

	for_each_crtc(dev, crtc) {

		unsigned int cur_size;

		intel_crtc = to_intel_crtc(crtc);

		if (!intel_crtc->active) {

			DRM_DEBUG_KMS("pipe %c not active, skipping\n",

				      pipe_name(intel_crtc->pipe));

			continue;

		}

		DRM_DEBUG_KMS("checking plane %c for BIOS fb\n",

			      pipe_name(intel_crtc->pipe));

		/*

		 * See if the plane fb we found above will fit on this

		 * pipe.  Note we need to use the selected fb's pitch and bpp

		 * rather than the current pipe's, since they differ.

		 */

		cur_size = intel_crtc->config.adjusted_mode.crtc_hdisplay;

		cur_size = cur_size * fb->base.bits_per_pixel / 8;

		if (fb->base.pitches[0] < cur_size) {

			DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",

				      pipe_name(intel_crtc->pipe),

				      cur_size, fb->base.pitches[0]);

			plane_config = NULL;

			fb = NULL;

			break;

		}

		cur_size = intel_crtc->config.adjusted_mode.crtc_vdisplay;

		cur_size = ALIGN(cur_size, plane_config->tiled ? (IS_GEN2(dev) ? 16 : 8) : 1);

		cur_size *= fb->base.pitches[0];

		DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",

			      pipe_name(intel_crtc->pipe),

			      intel_crtc->config.adjusted_mode.crtc_hdisplay,

			      intel_crtc->config.adjusted_mode.crtc_vdisplay,

			      fb->base.bits_per_pixel,

			      cur_size);

		if (cur_size > max_size) {

			DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",

				      pipe_name(intel_crtc->pipe),

				      cur_size, max_size);

			plane_config = NULL;

			fb = NULL;

			break;

		}

		DRM_DEBUG_KMS("fb big enough for plane %c (%d >= %d)\n",

			      pipe_name(intel_crtc->pipe),

			      max_size, cur_size);

	}

	if (!fb) {

		DRM_DEBUG_KMS("BIOS fb not suitable for all pipes, not using\n");

		goto out;

	}

	ifbdev->preferred_bpp = fb->base.bits_per_pixel;

	ifbdev->fb = fb;

	drm_framebuffer_reference(&ifbdev->fb->base);

	/* Final pass to check if any active pipes don't have fbs */

	for_each_crtc(dev, crtc) {

		intel_crtc = to_intel_crtc(crtc);

		if (!intel_crtc->active)

			continue;

		WARN(!crtc->primary->fb,

		     "re-used BIOS config but lost an fb on crtc %d\n",

		     crtc->base.id);

	}

	DRM_DEBUG_KMS("using BIOS fb for initial console\n");

	return true;

out:

	return false;

}

int intel_fbdev_init(struct drm_device *dev)

{

	struct intel_fbdev *ifbdev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	int ret;

	if (WARN_ON(INTEL_INFO(dev)->num_pipes == 0))

		return -ENODEV;

	ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);

	if (ifbdev == NULL)

		return -ENOMEM;

	drm_fb_helper_prepare(dev, &ifbdev->helper, &intel_fb_helper_funcs);

	if (!intel_fbdev_init_bios(dev, ifbdev))

		ifbdev->preferred_bpp = 32;

	ret = drm_fb_helper_init(dev, &ifbdev->helper,

				 INTEL_INFO(dev)->num_pipes, 4);

	if (ret) {

		kfree(ifbdev);

		return ret;

	}

	dev_priv->fbdev = ifbdev;

	drm_fb_helper_single_add_all_connectors(&ifbdev->helper);

    return 0;

}

void intel_fbdev_initial_config(void *data, async_cookie_t cookie)

{

	struct drm_i915_private *dev_priv = data;

	struct intel_fbdev *ifbdev = dev_priv->fbdev;

	/* Due to peculiar init order wrt to hpd handling this is separate. */

	drm_fb_helper_initial_config(&ifbdev->helper, ifbdev->preferred_bpp);

}

void intel_fbdev_output_poll_changed(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	if (dev_priv->fbdev)

		drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);

}