xref: /xsrc/external/mit/xf86-video-ati/dist/src/radeon_crtc.c

/*
 * Copyright 2000 ATI Technologies Inc., Markham, Ontario, and
 *                VA Linux Systems Inc., Fremont, California.
 *
 * All Rights Reserved.
 *
 * 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 on 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
 * NON-INFRINGEMENT.  IN NO EVENT SHALL ATI, VA LINUX SYSTEMS AND/OR
 * THEIR SUPPLIERS 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <math.h>

/* X and server generic header files */
#include "xf86.h"
#include "xf86_OSproc.h"
#include "vgaHW.h"
#include "xf86Modes.h"

/* Driver data structures */
#include "radeon.h"
#include "radeon_reg.h"
#include "radeon_macros.h"
#include "radeon_probe.h"
#include "radeon_version.h"

#ifdef XF86DRI
#define _XF86DRI_SERVER_
#include "radeon_drm.h"
#include "sarea.h"
#endif

extern void atombios_crtc_mode_set(xf86CrtcPtr crtc,
				   DisplayModePtr mode,
				   DisplayModePtr adjusted_mode,
				   int x, int y);
extern void atombios_crtc_dpms(xf86CrtcPtr crtc, int mode);
extern void
RADEONInitDispBandwidthLegacy(ScrnInfoPtr pScrn,
			      DisplayModePtr mode1, int pixel_bytes1,
			      DisplayModePtr mode2, int pixel_bytes2);
extern void
RADEONInitDispBandwidthAVIVO(ScrnInfoPtr pScrn,
			     DisplayModePtr mode1, int pixel_bytes1,
			     DisplayModePtr mode2, int pixel_bytes2);

void
radeon_crtc_dpms(xf86CrtcPtr crtc, int mode)
{
    RADEONInfoPtr info = RADEONPTR(crtc->scrn);
    RADEONEntPtr pRADEONEnt = RADEONEntPriv(crtc->scrn);
    RADEONCrtcPrivatePtr radeon_crtc = crtc->driver_private;
    xf86CrtcPtr crtc0 = pRADEONEnt->pCrtc[0];

    if ((mode == DPMSModeOn) && radeon_crtc->enabled)
	return;

    if (mode == DPMSModeOff)
	radeon_crtc_modeset_ioctl(crtc, FALSE);

    if (IS_AVIVO_VARIANT || info->r4xx_atom) {
	atombios_crtc_dpms(crtc, mode);
    } else {

	/* need to restore crtc1 before crtc0 or we may get a blank screen
	 * in some cases
	 */
	if ((radeon_crtc->crtc_id == 1) && (mode == DPMSModeOn)) {
	    if (crtc0->enabled)
		legacy_crtc_dpms(crtc0,  DPMSModeOff);
	}

	legacy_crtc_dpms(crtc, mode);

	if ((radeon_crtc->crtc_id == 1) && (mode == DPMSModeOn)) {
	    if (crtc0->enabled)
		legacy_crtc_dpms(crtc0, mode);
	}
    }

    if (mode != DPMSModeOff) {
	radeon_crtc_modeset_ioctl(crtc, TRUE);
	radeon_crtc_load_lut(crtc);
    }

    if (mode == DPMSModeOn)
	radeon_crtc->enabled = TRUE;
    else
	radeon_crtc->enabled = FALSE;
}

static Bool
radeon_crtc_mode_fixup(xf86CrtcPtr crtc, DisplayModePtr mode,
		     DisplayModePtr adjusted_mode)
{
    return TRUE;
}

static void
radeon_crtc_mode_prepare(xf86CrtcPtr crtc)
{
    RADEONCrtcPrivatePtr radeon_crtc = crtc->driver_private;

    if (radeon_crtc->enabled)
	crtc->funcs->hide_cursor(crtc);
}

static uint32_t RADEONDiv(CARD64 n, uint32_t d)
{
    return (n + (d / 2)) / d;
}

static void
RADEONComputePLL_old(RADEONPLLPtr pll,
		     unsigned long freq,
		     uint32_t *chosen_dot_clock_freq,
		     uint32_t *chosen_feedback_div,
		     uint32_t *chosen_frac_feedback_div,
		     uint32_t *chosen_reference_div,
		     uint32_t *chosen_post_div,
		     int flags)
{
    uint32_t min_ref_div = pll->min_ref_div;
    uint32_t max_ref_div = pll->max_ref_div;
    uint32_t min_post_div = pll->min_post_div;
    uint32_t max_post_div = pll->max_post_div;
    uint32_t min_fractional_feed_div = 0;
    uint32_t max_fractional_feed_div = 0;
    uint32_t best_vco = pll->best_vco;
    uint32_t best_post_div = 1;
    uint32_t best_ref_div = 1;
    uint32_t best_feedback_div = 1;
    uint32_t best_frac_feedback_div = 0;
    uint32_t best_freq = -1;
    uint32_t best_error = 0xffffffff;
    uint32_t best_vco_diff = 1;
    uint32_t post_div;

    freq = freq * 1000;

    ErrorF("freq: %lu\n", freq);

    if (flags & RADEON_PLL_USE_REF_DIV)
	min_ref_div = max_ref_div = pll->reference_div;
    else {
	while (min_ref_div < max_ref_div-1) {
	    uint32_t mid=(min_ref_div+max_ref_div)/2;
	    uint32_t pll_in = pll->reference_freq / mid;
	    if (pll_in < pll->pll_in_min)
		max_ref_div = mid;
	    else if (pll_in > pll->pll_in_max)
		min_ref_div = mid;
	    else break;
	}
    }

    if (flags & RADEON_PLL_USE_POST_DIV)
	min_post_div = max_post_div = pll->post_div;

    if (flags & RADEON_PLL_USE_FRAC_FB_DIV) {
	min_fractional_feed_div = pll->min_frac_feedback_div;
	max_fractional_feed_div = pll->max_frac_feedback_div;
    }

    for (post_div = min_post_div; post_div <= max_post_div; ++post_div) {
	uint32_t ref_div;

	if ((flags & RADEON_PLL_NO_ODD_POST_DIV) && (post_div & 1))
	    continue;

	/* legacy radeons only have a few post_divs */
	if (flags & RADEON_PLL_LEGACY) {
	    if ((post_div == 5) ||
		(post_div == 7) ||
		(post_div == 9) ||
		(post_div == 10) ||
		(post_div == 11))
		continue;
	}

	for (ref_div = min_ref_div; ref_div <= max_ref_div; ++ref_div) {
	    uint32_t feedback_div, current_freq = 0, error, vco_diff;
	    uint32_t pll_in = pll->reference_freq / ref_div;
	    uint32_t min_feed_div = pll->min_feedback_div;
	    uint32_t max_feed_div = pll->max_feedback_div+1;

	    if (pll_in < pll->pll_in_min || pll_in > pll->pll_in_max)
		continue;

	    while (min_feed_div < max_feed_div) {
		uint32_t vco;
		uint32_t min_frac_feed_div = min_fractional_feed_div;
		uint32_t max_frac_feed_div = max_fractional_feed_div+1;
		uint32_t frac_feedback_div;
		CARD64 tmp;

		feedback_div = (min_feed_div+max_feed_div)/2;

		tmp = (CARD64)pll->reference_freq * feedback_div;
		vco = RADEONDiv(tmp, ref_div);

		if (vco < pll->pll_out_min) {
		    min_feed_div = feedback_div+1;
		    continue;
		} else if(vco > pll->pll_out_max) {
		    max_feed_div = feedback_div;
		    continue;
		}

		while (min_frac_feed_div < max_frac_feed_div) {
		    frac_feedback_div = (min_frac_feed_div+max_frac_feed_div)/2;
		    tmp = (CARD64)pll->reference_freq * 10000 * feedback_div;
		    tmp += (CARD64)pll->reference_freq * 1000 * frac_feedback_div;
		    current_freq = RADEONDiv(tmp, ref_div * post_div);

		    if (flags & RADEON_PLL_PREFER_CLOSEST_LOWER) {
			error = freq - current_freq;
			error = (int32_t)error < 0 ? 0xffffffff : error;
		    } else
			error = abs(current_freq - freq);
		    vco_diff = abs(vco - best_vco);

		    if ((best_vco == 0 && error < best_error) ||
			(best_vco != 0 &&
			 (error < best_error - 100 ||
			  (abs(error - best_error) < 100 && vco_diff < best_vco_diff )))) {
			best_post_div = post_div;
			best_ref_div = ref_div;
			best_feedback_div = feedback_div;
			best_frac_feedback_div = frac_feedback_div;
			best_freq = current_freq;
			best_error = error;
			best_vco_diff = vco_diff;
		    } else if (current_freq == freq) {
			if (best_freq == -1) {
			    best_post_div = post_div;
			    best_ref_div = ref_div;
			    best_feedback_div = feedback_div;
			    best_frac_feedback_div = frac_feedback_div;
			    best_freq = current_freq;
			    best_error = error;
			    best_vco_diff = vco_diff;
			} else if (((flags & RADEON_PLL_PREFER_LOW_REF_DIV) && (ref_div < best_ref_div)) ||
				   ((flags & RADEON_PLL_PREFER_HIGH_REF_DIV) && (ref_div > best_ref_div)) ||
				   ((flags & RADEON_PLL_PREFER_LOW_FB_DIV) && (feedback_div < best_feedback_div)) ||
				   ((flags & RADEON_PLL_PREFER_HIGH_FB_DIV) && (feedback_div > best_feedback_div)) ||
				   ((flags & RADEON_PLL_PREFER_LOW_POST_DIV) && (post_div < best_post_div)) ||
				   ((flags & RADEON_PLL_PREFER_HIGH_POST_DIV) && (post_div > best_post_div))) {
			    best_post_div = post_div;
			    best_ref_div = ref_div;
			    best_feedback_div = feedback_div;
			    best_frac_feedback_div = frac_feedback_div;
			    best_freq = current_freq;
			    best_error = error;
			    best_vco_diff = vco_diff;
			}
		    }
		    if (current_freq < freq)
			min_frac_feed_div = frac_feedback_div+1;
		    else
			max_frac_feed_div = frac_feedback_div;
		}
		if (current_freq < freq)
		    min_feed_div = feedback_div+1;
		else
		    max_feed_div = feedback_div;
	    }
	}
    }

    ErrorF("best_freq: %u\n", (unsigned int)best_freq);
    ErrorF("best_feedback_div: %u\n", (unsigned int)best_feedback_div);
    ErrorF("best_frac_feedback_div: %u\n", (unsigned int)best_frac_feedback_div);
    ErrorF("best_ref_div: %u\n", (unsigned int)best_ref_div);
    ErrorF("best_post_div: %u\n", (unsigned int)best_post_div);

    if (best_freq == -1)
	FatalError("Couldn't find valid PLL dividers\n");
    *chosen_dot_clock_freq = best_freq / 10000;
    *chosen_feedback_div = best_feedback_div;
    *chosen_frac_feedback_div = best_frac_feedback_div;
    *chosen_reference_div = best_ref_div;
    *chosen_post_div = best_post_div;

}

static Bool
calc_fb_div(RADEONPLLPtr pll,
            unsigned long freq,
            int flags,
            int post_div,
	    int ref_div,
            int *fb_div,
            int *fb_div_frac)
{
    float ffreq = freq / 10;
    float vco_freq = ffreq * post_div;
    float feedback_divider = vco_freq * ref_div / pll->reference_freq;

    if (flags & RADEON_PLL_USE_FRAC_FB_DIV) {
        feedback_divider = floor((feedback_divider * 10.0) + 0.5) * 0.1;

	*fb_div = floor(feedback_divider);
        *fb_div_frac = fmod(feedback_divider, 1.0) * 10.0;

    } else {
        *fb_div = floor(feedback_divider + 0.5);
        *fb_div_frac = 0;
    }
    if ((*fb_div < pll->min_feedback_div) || (*fb_div > pll->max_feedback_div))
        return FALSE;
    else
        return TRUE;
}

static Bool
calc_fb_ref_div(RADEONPLLPtr pll,
                unsigned long freq,
                int flags,
                int post_div,
                int *fb_div,
                int *fb_div_frac,
                int *ref_div)
{
    float ffreq = freq / 10;
    float max_error = ffreq * 0.0025;
    float vco, error, pll_out;

    for ((*ref_div) = pll->min_ref_div; (*ref_div) < pll->max_ref_div; ++(*ref_div)) {
        if (calc_fb_div(pll, freq, flags, post_div, (*ref_div), fb_div, fb_div_frac)) {
            vco = pll->reference_freq * ((*fb_div) + ((*fb_div_frac) * 0.1)) / (*ref_div);

            if ((vco < pll->pll_out_min) || (vco > pll->pll_out_max))
                continue;

            pll_out = vco / post_div;

            error = pll_out - ffreq;
            if ((fabs(error) <= max_error) && (error >= 0))
                return TRUE;
        }
    }
    return FALSE;
}

static void
RADEONComputePLL_new(RADEONPLLPtr pll,
		     unsigned long freq,
		     uint32_t *chosen_dot_clock_freq,
		     uint32_t *chosen_feedback_div,
		     uint32_t *chosen_frac_feedback_div,
		     uint32_t *chosen_reference_div,
		     uint32_t *chosen_post_div,
		     int flags)
{
    float ffreq = freq / 10;
    float vco_frequency;
    int fb_div = 0, fb_div_frac = 0, post_div = 0, ref_div = 0;
    uint32_t best_freq = 0;

    if (flags & RADEON_PLL_USE_POST_DIV) {
        post_div = pll->post_div;
        if ((post_div < pll->min_post_div) || (post_div > pll->max_post_div))
            goto done;
        vco_frequency = ffreq * post_div;
        if ((vco_frequency < pll->pll_out_min) || (vco_frequency > pll->pll_out_max))
            goto done;

        if (flags & RADEON_PLL_USE_REF_DIV) {
            ref_div = pll->reference_div;
            if ((ref_div < pll->min_ref_div) || (ref_div > pll->max_ref_div))
                goto done;
            if (!calc_fb_div(pll, freq, flags, post_div, ref_div, &fb_div, &fb_div_frac))
                goto done;
        }
    } else {
	for (post_div = pll->max_post_div; post_div >= pll->min_post_div; --post_div) {
	    if (flags & RADEON_PLL_LEGACY) {
		if ((post_div == 5) ||
		    (post_div == 7) ||
		    (post_div == 9) ||
		    (post_div == 10) ||
		    (post_div == 11))
		    continue;
	    }
	    if ((flags & RADEON_PLL_NO_ODD_POST_DIV) && (post_div & 1))
		continue;

	    vco_frequency = ffreq * post_div;
	    if ((vco_frequency < pll->pll_out_min) || (vco_frequency > pll->pll_out_max))
		continue;
	    if (flags & RADEON_PLL_USE_REF_DIV) {
		ref_div = pll->reference_div;
		if ((ref_div < pll->min_ref_div) || (ref_div > pll->max_ref_div))
		    goto done;
		if (calc_fb_div(pll, freq, flags, post_div, ref_div, &fb_div, &fb_div_frac))
		    break;
	    } else {
		if (calc_fb_ref_div(pll, freq, flags, post_div, &fb_div, &fb_div_frac, &ref_div))
		    break;
	    }
	}
    }

    best_freq = pll->reference_freq * 10 * fb_div;
    best_freq += pll->reference_freq * fb_div_frac;
    best_freq = best_freq / (ref_div * post_div);

    ErrorF("best_freq: %u\n", (unsigned int)best_freq);
    ErrorF("best_feedback_div: %u\n", (unsigned int)fb_div);
    ErrorF("best_frac_feedback_div: %u\n", (unsigned int)fb_div_frac);
    ErrorF("best_ref_div: %u\n", (unsigned int)ref_div);
    ErrorF("best_post_div: %u\n", (unsigned int)post_div);

done:
    if (best_freq == 0)
	FatalError("Couldn't find valid PLL dividers\n");

    *chosen_dot_clock_freq = best_freq;
    *chosen_feedback_div = fb_div;
    *chosen_frac_feedback_div = fb_div_frac;
    *chosen_reference_div = ref_div;
    *chosen_post_div = post_div;

}

void
RADEONComputePLL(xf86CrtcPtr crtc,
		 RADEONPLLPtr pll,
		 unsigned long freq,
		 uint32_t *chosen_dot_clock_freq,
		 uint32_t *chosen_feedback_div,
		 uint32_t *chosen_frac_feedback_div,
		 uint32_t *chosen_reference_div,
		 uint32_t *chosen_post_div,
		 int flags)
{
    RADEONCrtcPrivatePtr radeon_crtc = crtc->driver_private;

    switch (radeon_crtc->pll_algo) {
    case RADEON_PLL_OLD:
	RADEONComputePLL_old(pll, freq, chosen_dot_clock_freq,
			     chosen_feedback_div, chosen_frac_feedback_div,
			     chosen_reference_div, chosen_post_div, flags);
	break;
    case RADEON_PLL_NEW:
	/* disable frac fb dividers */
	flags &= ~RADEON_PLL_USE_FRAC_FB_DIV;
	RADEONComputePLL_new(pll, freq, chosen_dot_clock_freq,
			     chosen_feedback_div, chosen_frac_feedback_div,
			     chosen_reference_div, chosen_post_div, flags);
	break;
    }
}

static void
radeon_crtc_mode_set(xf86CrtcPtr crtc, DisplayModePtr mode,
		     DisplayModePtr adjusted_mode, int x, int y)
{
    ScrnInfoPtr pScrn = crtc->scrn;
    RADEONInfoPtr info = RADEONPTR(pScrn);

    if (IS_AVIVO_VARIANT || info->r4xx_atom) {
	atombios_crtc_mode_set(crtc, mode, adjusted_mode, x, y);
    } else {
	legacy_crtc_mode_set(crtc, mode, adjusted_mode, x, y);
    }
}

static void
radeon_crtc_mode_commit(xf86CrtcPtr crtc)
{
    if (crtc->scrn->pScreen != NULL)
	xf86_reload_cursors(crtc->scrn->pScreen);
}

void
radeon_crtc_load_lut(xf86CrtcPtr crtc)
{
    ScrnInfoPtr pScrn = crtc->scrn;
    RADEONCrtcPrivatePtr radeon_crtc = crtc->driver_private;
    RADEONInfoPtr info = RADEONPTR(pScrn);
    unsigned char *RADEONMMIO = info->MMIO;
    int i;

    if (!crtc->enabled)
	return;

    if (IS_DCE4_VARIANT) {
	OUTREG(EVERGREEN_DC_LUT_CONTROL + radeon_crtc->crtc_offset, 0);

	OUTREG(EVERGREEN_DC_LUT_BLACK_OFFSET_BLUE + radeon_crtc->crtc_offset, 0);
	OUTREG(EVERGREEN_DC_LUT_BLACK_OFFSET_GREEN + radeon_crtc->crtc_offset, 0);
	OUTREG(EVERGREEN_DC_LUT_BLACK_OFFSET_RED + radeon_crtc->crtc_offset, 0);

	OUTREG(EVERGREEN_DC_LUT_WHITE_OFFSET_BLUE + radeon_crtc->crtc_offset, 0x0000ffff);
	OUTREG(EVERGREEN_DC_LUT_WHITE_OFFSET_GREEN + radeon_crtc->crtc_offset, 0x0000ffff);
	OUTREG(EVERGREEN_DC_LUT_WHITE_OFFSET_RED + radeon_crtc->crtc_offset, 0x0000ffff);

	OUTREG(EVERGREEN_DC_LUT_RW_MODE + radeon_crtc->crtc_offset, 0);
	OUTREG(EVERGREEN_DC_LUT_WRITE_EN_MASK + radeon_crtc->crtc_offset, 0x00000007);

	for (i = 0; i < 256; i++) {
	    OUTREG(EVERGREEN_DC_LUT_RW_INDEX + radeon_crtc->crtc_offset, i);
	    OUTREG(EVERGREEN_DC_LUT_30_COLOR + radeon_crtc->crtc_offset,
		   (((radeon_crtc->lut_r[i]) << 20) |
		    ((radeon_crtc->lut_g[i]) << 10) |
		    (radeon_crtc->lut_b[i])));
	}
    } else {
	if (IS_AVIVO_VARIANT) {
	    OUTREG(AVIVO_DC_LUTA_CONTROL + radeon_crtc->crtc_offset, 0);

	    OUTREG(AVIVO_DC_LUTA_BLACK_OFFSET_BLUE + radeon_crtc->crtc_offset, 0);
	    OUTREG(AVIVO_DC_LUTA_BLACK_OFFSET_GREEN + radeon_crtc->crtc_offset, 0);
	    OUTREG(AVIVO_DC_LUTA_BLACK_OFFSET_RED + radeon_crtc->crtc_offset, 0);

	    OUTREG(AVIVO_DC_LUTA_WHITE_OFFSET_BLUE + radeon_crtc->crtc_offset, 0x0000ffff);
	    OUTREG(AVIVO_DC_LUTA_WHITE_OFFSET_GREEN + radeon_crtc->crtc_offset, 0x0000ffff);
	    OUTREG(AVIVO_DC_LUTA_WHITE_OFFSET_RED + radeon_crtc->crtc_offset, 0x0000ffff);
	}

	PAL_SELECT(radeon_crtc->crtc_id);

	if (IS_AVIVO_VARIANT) {
	    OUTREG(AVIVO_DC_LUT_RW_MODE, 0);
	    OUTREG(AVIVO_DC_LUT_WRITE_EN_MASK, 0x0000003f);
	}

	for (i = 0; i < 256; i++) {
	    OUTPAL(i, radeon_crtc->lut_r[i], radeon_crtc->lut_g[i], radeon_crtc->lut_b[i]);
	}

	if (IS_AVIVO_VARIANT)
	    OUTREG(AVIVO_D1GRPH_LUT_SEL + radeon_crtc->crtc_offset, radeon_crtc->crtc_id);
    }

}

static void
radeon_crtc_gamma_set(xf86CrtcPtr crtc, uint16_t *red, uint16_t *green,
		      uint16_t *blue, int size)
{
    RADEONCrtcPrivatePtr radeon_crtc = crtc->driver_private;
    int i;

    for (i = 0; i < 256; i++) {
	radeon_crtc->lut_r[i] = red[i] >> 6;
	radeon_crtc->lut_g[i] = green[i] >> 6;
	radeon_crtc->lut_b[i] = blue[i] >> 6;
    }

    radeon_crtc_load_lut(crtc);
}

static Bool
radeon_crtc_lock(xf86CrtcPtr crtc)
{
    ScrnInfoPtr		pScrn = crtc->scrn;
    RADEONInfoPtr  info = RADEONPTR(pScrn);

#ifdef XF86DRI
    if (info->cp->CPStarted && pScrn->pScreen) {
	DRILock(pScrn->pScreen, 0);
	if (info->accelOn)
	    RADEON_SYNC(info, pScrn);
	return TRUE;
    }
#endif
    if (info->accelOn)
        RADEON_SYNC(info, pScrn);

    return FALSE;

}

static void
radeon_crtc_unlock(xf86CrtcPtr crtc)
{
    ScrnInfoPtr		pScrn = crtc->scrn;
    RADEONInfoPtr  info = RADEONPTR(pScrn);

#ifdef XF86DRI
	if (info->cp->CPStarted && pScrn->pScreen) DRIUnlock(pScrn->pScreen);
#endif

    if (info->accelOn)
        RADEON_SYNC(info, pScrn);
}

/**
 * Allocates memory for a locked-in-framebuffer shadow of the given
 * width and height for this CRTC's rotated shadow framebuffer.
 */

static void *
radeon_crtc_shadow_allocate (xf86CrtcPtr crtc, int width, int height)
{
    ScrnInfoPtr pScrn = crtc->scrn;
    RADEONInfoPtr  info = RADEONPTR(pScrn);
    RADEONCrtcPrivatePtr radeon_crtc = crtc->driver_private;
    unsigned long rotate_pitch;
    unsigned long rotate_offset;
    int size;
    int cpp = pScrn->bitsPerPixel / 8;

    /* No rotation without accel */
    if (((info->ChipFamily >= CHIP_FAMILY_R600) && !info->directRenderingEnabled) ||
	xf86ReturnOptValBool(info->Options, OPTION_NOACCEL, FALSE)) {
	xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		   "Acceleration required for rotation\n");
	return NULL;
    }

    rotate_pitch = pScrn->displayWidth * cpp;
    size = rotate_pitch * height;

    /* We could get close to what we want here by just creating a pixmap like
     * normal, but we have to lock it down in framebuffer, and there is no
     * setter for offscreen area locking in EXA currently.  So, we just
     * allocate offscreen memory and fake up a pixmap header for it.
     */
    rotate_offset = radeon_legacy_allocate_memory(pScrn, &radeon_crtc->crtc_rotate_mem,
		    size, RADEON_GPU_PAGE_SIZE, RADEON_GEM_DOMAIN_VRAM);
    if (rotate_offset == 0)
	return NULL;

    return info->FB + rotate_offset;
}

/**
 * Creates a pixmap for this CRTC's rotated shadow framebuffer.
 */
static PixmapPtr
radeon_crtc_shadow_create(xf86CrtcPtr crtc, void *data, int width, int height)
{
    ScrnInfoPtr pScrn = crtc->scrn;
    unsigned long rotate_pitch;
    PixmapPtr rotate_pixmap;
    int cpp = pScrn->bitsPerPixel / 8;

    if (!data)
	data = radeon_crtc_shadow_allocate(crtc, width, height);

    rotate_pitch = pScrn->displayWidth * cpp;

    rotate_pixmap = GetScratchPixmapHeader(pScrn->pScreen,
					   width, height,
					   pScrn->depth,
					   pScrn->bitsPerPixel,
					   rotate_pitch,
					   data);

    if (rotate_pixmap == NULL) {
	xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		   "Couldn't allocate shadow pixmap for rotated CRTC\n");
    }

    return rotate_pixmap;
}

static void
radeon_crtc_shadow_destroy(xf86CrtcPtr crtc, PixmapPtr rotate_pixmap, void *data)
{
    ScrnInfoPtr pScrn = crtc->scrn;
    RADEONCrtcPrivatePtr radeon_crtc = crtc->driver_private;

    if (rotate_pixmap)
	FreeScratchPixmapHeader(rotate_pixmap);

    if (data) {
	radeon_legacy_free_memory(pScrn, radeon_crtc->crtc_rotate_mem);
	radeon_crtc->crtc_rotate_mem = NULL;
    }

}

#if XF86_CRTC_VERSION >= 2
#include "radeon_atombios.h"

extern AtomBiosResult
atombios_lock_crtc(atomBiosHandlePtr atomBIOS, int crtc, int lock);
extern void
RADEONInitCrtcBase(xf86CrtcPtr crtc, RADEONSavePtr save,
		   int x, int y);
extern void
RADEONInitCrtc2Base(xf86CrtcPtr crtc, RADEONSavePtr save,
		    int x, int y);
extern void
RADEONRestoreCrtcBase(ScrnInfoPtr pScrn,
		      RADEONSavePtr restore);
extern void
RADEONRestoreCrtc2Base(ScrnInfoPtr pScrn,
		       RADEONSavePtr restore);

static void
radeon_crtc_set_origin(xf86CrtcPtr crtc, int x, int y)
{
    ScrnInfoPtr pScrn = crtc->scrn;
    RADEONCrtcPrivatePtr radeon_crtc = crtc->driver_private;
    RADEONInfoPtr info = RADEONPTR(pScrn);
    unsigned char *RADEONMMIO = info->MMIO;


    if (IS_DCE4_VARIANT) {
	x &= ~3;
	y &= ~1;
	atombios_lock_crtc(info->atomBIOS, radeon_crtc->crtc_id, 1);
	OUTREG(EVERGREEN_VIEWPORT_START + radeon_crtc->crtc_offset, (x << 16) | y);
	atombios_lock_crtc(info->atomBIOS, radeon_crtc->crtc_id, 0);
    } else if (IS_AVIVO_VARIANT) {
	x &= ~3;
	y &= ~1;
	atombios_lock_crtc(info->atomBIOS, radeon_crtc->crtc_id, 1);
	OUTREG(AVIVO_D1MODE_VIEWPORT_START + radeon_crtc->crtc_offset, (x << 16) | y);
	atombios_lock_crtc(info->atomBIOS, radeon_crtc->crtc_id, 0);
    } else {
	switch (radeon_crtc->crtc_id) {
	case 0:
	    RADEONInitCrtcBase(crtc, info->ModeReg, x, y);
	    RADEONRestoreCrtcBase(pScrn, info->ModeReg);
	    break;
	case 1:
	    RADEONInitCrtc2Base(crtc, info->ModeReg, x, y);
	    RADEONRestoreCrtc2Base(pScrn, info->ModeReg);
	    break;
	default:
	    break;
	}
    }
}
#endif


static xf86CrtcFuncsRec radeon_crtc_funcs = {
    .dpms = radeon_crtc_dpms,
    .save = NULL, /* XXX */
    .restore = NULL, /* XXX */
    .mode_fixup = radeon_crtc_mode_fixup,
    .prepare = radeon_crtc_mode_prepare,
    .mode_set = radeon_crtc_mode_set,
    .commit = radeon_crtc_mode_commit,
    .gamma_set = radeon_crtc_gamma_set,
    .lock = radeon_crtc_lock,
    .unlock = radeon_crtc_unlock,
    .shadow_create = radeon_crtc_shadow_create,
    .shadow_allocate = radeon_crtc_shadow_allocate,
    .shadow_destroy = radeon_crtc_shadow_destroy,
    .set_cursor_colors = radeon_crtc_set_cursor_colors,
    .set_cursor_position = radeon_crtc_set_cursor_position,
    .show_cursor = radeon_crtc_show_cursor,
    .hide_cursor = radeon_crtc_hide_cursor,
    .load_cursor_argb = radeon_crtc_load_cursor_argb,
    .destroy = NULL, /* XXX */
#if XF86_CRTC_VERSION >= 2
    .set_origin = radeon_crtc_set_origin,
#endif
};

void
RADEONInitDispBandwidth(ScrnInfoPtr pScrn)
{
    RADEONInfoPtr info = RADEONPTR(pScrn);
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    DisplayModePtr mode1 = NULL, mode2 = NULL;
    int pixel_bytes1 = info->CurrentLayout.pixel_bytes;
    int pixel_bytes2 = info->CurrentLayout.pixel_bytes;

    /* XXX fix me */
    if (IS_DCE4_VARIANT)
	return;

    if (xf86_config->num_crtc == 2) {
	if (xf86_config->crtc[1]->enabled &&
	    xf86_config->crtc[0]->enabled) {
	    mode1 = &xf86_config->crtc[0]->mode;
	    mode2 = &xf86_config->crtc[1]->mode;
	} else if (xf86_config->crtc[0]->enabled) {
	    mode1 = &xf86_config->crtc[0]->mode;
	} else if (xf86_config->crtc[1]->enabled) {
	    mode2 = &xf86_config->crtc[1]->mode;
	} else
	    return;
    } else {
	if (info->IsPrimary)
	    mode1 = &xf86_config->crtc[0]->mode;
	else if (info->IsSecondary)
	    mode2 = &xf86_config->crtc[0]->mode;
	else if (xf86_config->crtc[0]->enabled)
	    mode1 = &xf86_config->crtc[0]->mode;
	else
	    return;
    }

    if (IS_AVIVO_VARIANT)
	RADEONInitDispBandwidthAVIVO(pScrn, mode1, pixel_bytes1, mode2, pixel_bytes2);
    else
	RADEONInitDispBandwidthLegacy(pScrn, mode1, pixel_bytes1, mode2, pixel_bytes2);
}

Bool RADEONAllocateControllers(ScrnInfoPtr pScrn, int mask)
{
    RADEONEntPtr pRADEONEnt = RADEONEntPriv(pScrn);
    RADEONInfoPtr  info = RADEONPTR(pScrn);
    int i;

    if (!xf86ReturnOptValBool(info->Options, OPTION_NOACCEL, FALSE)) {
	radeon_crtc_funcs.shadow_create = radeon_crtc_shadow_create;
	radeon_crtc_funcs.shadow_allocate = radeon_crtc_shadow_allocate;
	radeon_crtc_funcs.shadow_destroy = radeon_crtc_shadow_destroy;
    }

    if (mask & 1) {
	if (pRADEONEnt->Controller[0])
	    return TRUE;

	pRADEONEnt->pCrtc[0] = xf86CrtcCreate(pScrn, &radeon_crtc_funcs);
	if (!pRADEONEnt->pCrtc[0])
	    return FALSE;

	pRADEONEnt->Controller[0] = xnfcalloc(sizeof(RADEONCrtcPrivateRec), 1);
	if (!pRADEONEnt->Controller[0])
	    return FALSE;

	pRADEONEnt->pCrtc[0]->driver_private = pRADEONEnt->Controller[0];
	pRADEONEnt->Controller[0]->crtc_id = 0;
	pRADEONEnt->Controller[0]->crtc_offset = 0;
	pRADEONEnt->Controller[0]->initialized = FALSE;
	if (info->allowColorTiling)
	    pRADEONEnt->Controller[0]->can_tile = 1;
	else
	    pRADEONEnt->Controller[0]->can_tile = 0;
	pRADEONEnt->Controller[0]->pll_id = -1;
    }

    if (mask & 2) {
	if (!pRADEONEnt->HasCRTC2)
	    return TRUE;

	pRADEONEnt->pCrtc[1] = xf86CrtcCreate(pScrn, &radeon_crtc_funcs);
	if (!pRADEONEnt->pCrtc[1])
	    return FALSE;

	pRADEONEnt->Controller[1] = xnfcalloc(sizeof(RADEONCrtcPrivateRec), 1);
	if (!pRADEONEnt->Controller[1])
	    {
		free(pRADEONEnt->Controller[0]);
		return FALSE;
	    }

	pRADEONEnt->pCrtc[1]->driver_private = pRADEONEnt->Controller[1];
	pRADEONEnt->Controller[1]->crtc_id = 1;
	if (IS_DCE4_VARIANT)
	    pRADEONEnt->Controller[1]->crtc_offset = EVERGREEN_CRTC1_REGISTER_OFFSET;
	else
	    pRADEONEnt->Controller[1]->crtc_offset = AVIVO_D2CRTC_H_TOTAL - AVIVO_D1CRTC_H_TOTAL;
	pRADEONEnt->Controller[1]->initialized = FALSE;
	if (info->allowColorTiling)
	    pRADEONEnt->Controller[1]->can_tile = 1;
	else
	    pRADEONEnt->Controller[1]->can_tile = 0;
	pRADEONEnt->Controller[1]->pll_id = -1;
    }

    /* 6 crtcs on DCE4 chips */
    if (IS_DCE4_VARIANT && ((mask & 3) == 3) && !IS_DCE41_VARIANT) {
	for (i = 2; i < RADEON_MAX_CRTC; i++) {
	    pRADEONEnt->pCrtc[i] = xf86CrtcCreate(pScrn, &radeon_crtc_funcs);
	    if (!pRADEONEnt->pCrtc[i])
		return FALSE;

	    pRADEONEnt->Controller[i] = xnfcalloc(sizeof(RADEONCrtcPrivateRec), 1);
	    if (!pRADEONEnt->Controller[i])
	    {
		free(pRADEONEnt->Controller[i]);
		return FALSE;
	    }

	    pRADEONEnt->pCrtc[i]->driver_private = pRADEONEnt->Controller[i];
	    pRADEONEnt->Controller[i]->crtc_id = i;
	    switch (i) {
	    case 0:
		pRADEONEnt->Controller[i]->crtc_offset = EVERGREEN_CRTC0_REGISTER_OFFSET;
		break;
	    case 1:
		pRADEONEnt->Controller[i]->crtc_offset = EVERGREEN_CRTC1_REGISTER_OFFSET;
		break;
	    case 2:
		pRADEONEnt->Controller[i]->crtc_offset = EVERGREEN_CRTC2_REGISTER_OFFSET;
		break;
	    case 3:
		pRADEONEnt->Controller[i]->crtc_offset = EVERGREEN_CRTC3_REGISTER_OFFSET;
		break;
	    case 4:
		pRADEONEnt->Controller[i]->crtc_offset = EVERGREEN_CRTC4_REGISTER_OFFSET;
		break;
	    case 5:
		pRADEONEnt->Controller[i]->crtc_offset = EVERGREEN_CRTC5_REGISTER_OFFSET;
		break;
	    }
	    pRADEONEnt->Controller[i]->initialized = FALSE;
	    if (info->allowColorTiling)
		pRADEONEnt->Controller[i]->can_tile = 1;
	    else
		pRADEONEnt->Controller[i]->can_tile = 0;
	    pRADEONEnt->Controller[i]->pll_id = -1;
	}
    }

    return TRUE;
}

/**
 * In the current world order, there are lists of modes per output, which may
 * or may not include the mode that was asked to be set by XFree86's mode
 * selection.  Find the closest one, in the following preference order:
 *
 * - Equality
 * - Closer in size to the requested mode, but no larger
 * - Closer in refresh rate to the requested mode.
 */
DisplayModePtr
RADEONCrtcFindClosestMode(xf86CrtcPtr crtc, DisplayModePtr pMode)
{
    ScrnInfoPtr	pScrn = crtc->scrn;
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    DisplayModePtr pBest = NULL, pScan = NULL;
    int i;

    /* Assume that there's only one output connected to the given CRTC. */
    for (i = 0; i < xf86_config->num_output; i++)
    {
	xf86OutputPtr  output = xf86_config->output[i];
	if (output->crtc == crtc && output->probed_modes != NULL)
	{
	    pScan = output->probed_modes;
	    break;
	}
    }

    /* If the pipe doesn't have any detected modes, just let the system try to
     * spam the desired mode in.
     */
    if (pScan == NULL) {
	RADEONCrtcPrivatePtr  radeon_crtc = crtc->driver_private;
	xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
		   "No crtc mode list for crtc %d,"
		   "continuing with desired mode\n", radeon_crtc->crtc_id);
	return pMode;
    }

    for (; pScan != NULL; pScan = pScan->next) {
	assert(pScan->VRefresh != 0.0);

	/* If there's an exact match, we're done. */
	if (xf86ModesEqual(pScan, pMode)) {
	    pBest = pMode;
	    break;
	}

	/* Reject if it's larger than the desired mode. */
	if (pScan->HDisplay > pMode->HDisplay ||
	    pScan->VDisplay > pMode->VDisplay)
	{
	    continue;
	}

	if (pBest == NULL) {
	    pBest = pScan;
	    continue;
	}

	/* Find if it's closer to the right size than the current best
	 * option.
	 */
	if ((pScan->HDisplay > pBest->HDisplay &&
	     pScan->VDisplay >= pBest->VDisplay) ||
	    (pScan->HDisplay >= pBest->HDisplay &&
	     pScan->VDisplay > pBest->VDisplay))
	{
	    pBest = pScan;
	    continue;
	}

	/* Find if it's still closer to the right refresh than the current
	 * best resolution.
	 */
	if (pScan->HDisplay == pBest->HDisplay &&
	    pScan->VDisplay == pBest->VDisplay &&
	    (fabs(pScan->VRefresh - pMode->VRefresh) <
	     fabs(pBest->VRefresh - pMode->VRefresh))) {
	    pBest = pScan;
	}
    }

    if (pBest == NULL) {
	xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
		   "No suitable mode found to program for the pipe.\n"
		   "	continuing with desired mode %dx%d@%.1f\n",
		   pMode->HDisplay, pMode->VDisplay, pMode->VRefresh);
    } else if (!xf86ModesEqual(pBest, pMode)) {
      RADEONCrtcPrivatePtr  radeon_crtc = crtc->driver_private;
      int		    crtc = radeon_crtc->crtc_id;
      xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
		   "Choosing pipe %d's mode %dx%d@%.1f instead of xf86 "
		   "mode %dx%d@%.1f\n", crtc,
		   pBest->HDisplay, pBest->VDisplay, pBest->VRefresh,
		   pMode->HDisplay, pMode->VDisplay, pMode->VRefresh);
	pMode = pBest;
    }
    return pMode;
}

void
RADEONBlank(ScrnInfoPtr pScrn)
{
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    xf86OutputPtr output;
    xf86CrtcPtr crtc;
    int o, c;

    for (c = 0; c < xf86_config->num_crtc; c++) {
	crtc = xf86_config->crtc[c];
	for (o = 0; o < xf86_config->num_output; o++) {
	    output = xf86_config->output[o];
	    if (output->crtc != crtc)
		continue;

	    output->funcs->dpms(output, DPMSModeOff);
	}
	crtc->funcs->dpms(crtc, DPMSModeOff);
    }
}

void
RADEONUnblank(ScrnInfoPtr pScrn)
{
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    xf86OutputPtr output;
    xf86CrtcPtr crtc;
    int o, c;

    for (c = 0; c < xf86_config->num_crtc; c++) {
	crtc = xf86_config->crtc[c];
	if(!crtc->enabled)
		continue;
	crtc->funcs->dpms(crtc, DPMSModeOn);
	for (o = 0; o < xf86_config->num_output; o++) {
	    output = xf86_config->output[o];
	    if (output->crtc != crtc)
		continue;

	    output->funcs->dpms(output, DPMSModeOn);
	}
    }
}

Bool
RADEONSetTiling(ScrnInfoPtr pScrn)
{
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    RADEONInfoPtr info = RADEONPTR(pScrn);
    RADEONCrtcPrivatePtr radeon_crtc;
    xf86CrtcPtr crtc;
    int c;
    int can_tile = 1;
    Bool changed = FALSE;

    for (c = 0; c < xf86_config->num_crtc; c++) {
	crtc = xf86_config->crtc[c];
	radeon_crtc = crtc->driver_private;

	if (crtc->enabled) {
	    if (!radeon_crtc->can_tile)
		can_tile = 0;
	}
    }

    if (info->tilingEnabled != can_tile)
	changed = TRUE;

#ifdef XF86DRI
    if (info->directRenderingEnabled && (info->tilingEnabled != can_tile)) {
	drm_radeon_sarea_t *pSAREAPriv;
	if (RADEONDRISetParam(pScrn, RADEON_SETPARAM_SWITCH_TILING, (can_tile ? 1 : 0)) < 0)
	    xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
		       "[drm] failed changing tiling status\n");
	/* if this is called during ScreenInit() we don't have pScrn->pScreen yet */
	pSAREAPriv = DRIGetSAREAPrivate(screenInfo.screens[pScrn->scrnIndex]);
	info->tilingEnabled = pSAREAPriv->tiling_enabled ? TRUE : FALSE;
    }
#endif

    return changed;
}