ast_mode.c

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/*
 * Copyright 2012 Red Hat Inc.
 * Parts based on xf86-video-ast
 * Copyright (c) 2005 ASPEED Technology Inc.
 *
 * 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, sub license, 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 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
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS 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.
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 */
/*
 * Authors: Dave Airlie <[email protected]>
 */
#include <linux/export.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include "ast_drv.h"

#include "ast_tables.h"

static struct ast_i2c_chan *ast_i2c_create(struct drm_device *dev);
static void ast_i2c_destroy(struct ast_i2c_chan *i2c);
static int ast_cursor_set(struct drm_crtc *crtc,
              struct drm_file *file_priv,
              uint32_t handle,
              uint32_t width,
              uint32_t height);
static int ast_cursor_move(struct drm_crtc *crtc,
               int x, int y);

static inline void ast_load_palette_index(struct ast_private *ast,
                     u8 index, u8 red, u8 green,
                     u8 blue)
{
    ast_io_write8(ast, AST_IO_DAC_INDEX_WRITE, index);
    ast_io_read8(ast, AST_IO_SEQ_PORT);
    ast_io_write8(ast, AST_IO_DAC_DATA, red);
    ast_io_read8(ast, AST_IO_SEQ_PORT);
    ast_io_write8(ast, AST_IO_DAC_DATA, green);
    ast_io_read8(ast, AST_IO_SEQ_PORT);
    ast_io_write8(ast, AST_IO_DAC_DATA, blue);
    ast_io_read8(ast, AST_IO_SEQ_PORT);
}

static void ast_crtc_load_lut(struct drm_crtc *crtc)
{
    struct ast_private *ast = crtc->dev->dev_private;
    struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
    int i;

    if (!crtc->enabled)
        return;

    for (i = 0; i < 256; i++)
        ast_load_palette_index(ast, i, ast_crtc->lut_r[i],
                       ast_crtc->lut_g[i], ast_crtc->lut_b[i]);
}

static bool ast_get_vbios_mode_info(struct drm_crtc *crtc, struct drm_display_mode *mode,
                    struct drm_display_mode *adjusted_mode,
                    struct ast_vbios_mode_info *vbios_mode)
{
    struct ast_private *ast = crtc->dev->dev_private;
    u32 refresh_rate_index = 0, mode_id, color_index, refresh_rate;
    u32 hborder, vborder;

    switch (crtc->fb->bits_per_pixel) {
    case 8:
        vbios_mode->std_table = &vbios_stdtable[VGAModeIndex];
        color_index = VGAModeIndex - 1;
        break;
    case 16:
        vbios_mode->std_table = &vbios_stdtable[HiCModeIndex];
        color_index = HiCModeIndex;
        break;
    case 24:
    case 32:
        vbios_mode->std_table = &vbios_stdtable[TrueCModeIndex];
        color_index = TrueCModeIndex;
        break;
    default:
        return false;
    }

    switch (crtc->mode.crtc_hdisplay) {
    case 640:
        vbios_mode->enh_table = &res_640x480[refresh_rate_index];
        break;
    case 800:
        vbios_mode->enh_table = &res_800x600[refresh_rate_index];
        break;
    case 1024:
        vbios_mode->enh_table = &res_1024x768[refresh_rate_index];
        break;
    case 1280:
        if (crtc->mode.crtc_vdisplay == 800)
            vbios_mode->enh_table = &res_1280x800[refresh_rate_index];
        else
            vbios_mode->enh_table = &res_1280x1024[refresh_rate_index];
        break;
    case 1440:
        vbios_mode->enh_table = &res_1440x900[refresh_rate_index];
        break;
    case 1600:
        vbios_mode->enh_table = &res_1600x1200[refresh_rate_index];
        break;
    case 1680:
        vbios_mode->enh_table = &res_1680x1050[refresh_rate_index];
        break;
    case 1920:
        if (crtc->mode.crtc_vdisplay == 1080)
            vbios_mode->enh_table = &res_1920x1080[refresh_rate_index];
        else
            vbios_mode->enh_table = &res_1920x1200[refresh_rate_index];
        break;
    default:
        return false;
    }

    refresh_rate = drm_mode_vrefresh(mode);
    while (vbios_mode->enh_table->refresh_rate < refresh_rate) {
        vbios_mode->enh_table++;
        if ((vbios_mode->enh_table->refresh_rate > refresh_rate) ||
            (vbios_mode->enh_table->refresh_rate == 0xff)) {
            vbios_mode->enh_table--;
            break;
        }
    }

    hborder = (vbios_mode->enh_table->flags & HBorder) ? 8 : 0;
    vborder = (vbios_mode->enh_table->flags & VBorder) ? 8 : 0;

    adjusted_mode->crtc_htotal = vbios_mode->enh_table->ht;
    adjusted_mode->crtc_hblank_start = vbios_mode->enh_table->hde + hborder;
    adjusted_mode->crtc_hblank_end = vbios_mode->enh_table->ht - hborder;
    adjusted_mode->crtc_hsync_start = vbios_mode->enh_table->hde + hborder +
        vbios_mode->enh_table->hfp;
    adjusted_mode->crtc_hsync_end = (vbios_mode->enh_table->hde + hborder +
                     vbios_mode->enh_table->hfp +
                     vbios_mode->enh_table->hsync);

    adjusted_mode->crtc_vtotal = vbios_mode->enh_table->vt;
    adjusted_mode->crtc_vblank_start = vbios_mode->enh_table->vde + vborder;
    adjusted_mode->crtc_vblank_end = vbios_mode->enh_table->vt - vborder;
    adjusted_mode->crtc_vsync_start = vbios_mode->enh_table->vde + vborder +
        vbios_mode->enh_table->vfp;
    adjusted_mode->crtc_vsync_end = (vbios_mode->enh_table->vde + vborder +
                     vbios_mode->enh_table->vfp +
                     vbios_mode->enh_table->vsync);

    refresh_rate_index = vbios_mode->enh_table->refresh_rate_index;
    mode_id = vbios_mode->enh_table->mode_id;

    if (ast->chip == AST1180) {
        /* TODO 1180 */
    } else {
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x8c, (u8)((color_index & 0xf) << 4));
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x8d, refresh_rate_index & 0xff);
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x8e, mode_id & 0xff);

        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x91, 0xa8);
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x92, crtc->fb->bits_per_pixel);
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x93, adjusted_mode->clock / 1000);
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x94, adjusted_mode->crtc_hdisplay);
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x95, adjusted_mode->crtc_hdisplay >> 8);

        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x96, adjusted_mode->crtc_vdisplay);
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x97, adjusted_mode->crtc_vdisplay >> 8);
    }

    return true;


}
static void ast_set_std_reg(struct drm_crtc *crtc, struct drm_display_mode *mode,
                struct ast_vbios_mode_info *vbios_mode)
{
    struct ast_private *ast = crtc->dev->dev_private;
    struct ast_vbios_stdtable *stdtable;
    u32 i;
    u8 jreg;

    stdtable = vbios_mode->std_table;

    jreg = stdtable->misc;
    ast_io_write8(ast, AST_IO_MISC_PORT_WRITE, jreg);

    /* Set SEQ */
    ast_set_index_reg(ast, AST_IO_SEQ_PORT, 0x00, 0x03);
    for (i = 0; i < 4; i++) {
        jreg = stdtable->seq[i];
        if (!i)
            jreg |= 0x20;
        ast_set_index_reg(ast, AST_IO_SEQ_PORT, (i + 1) , jreg);
    }

    /* Set CRTC */
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x11, 0x7f, 0x00);
    for (i = 0; i < 25; i++)
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, i, stdtable->crtc[i]);

    /* set AR */
    jreg = ast_io_read8(ast, AST_IO_INPUT_STATUS1_READ);
    for (i = 0; i < 20; i++) {
        jreg = stdtable->ar[i];
        ast_io_write8(ast, AST_IO_AR_PORT_WRITE, (u8)i);
        ast_io_write8(ast, AST_IO_AR_PORT_WRITE, jreg);
    }
    ast_io_write8(ast, AST_IO_AR_PORT_WRITE, 0x14);
    ast_io_write8(ast, AST_IO_AR_PORT_WRITE, 0x00);

    jreg = ast_io_read8(ast, AST_IO_INPUT_STATUS1_READ);
    ast_io_write8(ast, AST_IO_AR_PORT_WRITE, 0x20);

    /* Set GR */
    for (i = 0; i < 9; i++)
        ast_set_index_reg(ast, AST_IO_GR_PORT, i, stdtable->gr[i]);
}

static void ast_set_crtc_reg(struct drm_crtc *crtc, struct drm_display_mode *mode,
                 struct ast_vbios_mode_info *vbios_mode)
{
    struct ast_private *ast = crtc->dev->dev_private;
    u8 jreg05 = 0, jreg07 = 0, jreg09 = 0, jregAC = 0, jregAD = 0, jregAE = 0;
    u16 temp;

    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x11, 0x7f, 0x00);

    temp = (mode->crtc_htotal >> 3) - 5;
    if (temp & 0x100)
        jregAC |= 0x01; /* HT D[8] */
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x00, 0x00, temp);

    temp = (mode->crtc_hdisplay >> 3) - 1;
    if (temp & 0x100)
        jregAC |= 0x04; /* HDE D[8] */
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x01, 0x00, temp);

    temp = (mode->crtc_hblank_start >> 3) - 1;
    if (temp & 0x100)
        jregAC |= 0x10; /* HBS D[8] */
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x02, 0x00, temp);

    temp = ((mode->crtc_hblank_end >> 3) - 1) & 0x7f;
    if (temp & 0x20)
        jreg05 |= 0x80;  /* HBE D[5] */
    if (temp & 0x40)
        jregAD |= 0x01;  /* HBE D[5] */
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x03, 0xE0, (temp & 0x1f));

    temp = (mode->crtc_hsync_start >> 3) - 1;
    if (temp & 0x100)
        jregAC |= 0x40; /* HRS D[5] */
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x04, 0x00, temp);

    temp = ((mode->crtc_hsync_end >> 3) - 1) & 0x3f;
    if (temp & 0x20)
        jregAD |= 0x04; /* HRE D[5] */
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x05, 0x60, (u8)((temp & 0x1f) | jreg05));

    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xAC, 0x00, jregAC);
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xAD, 0x00, jregAD);

    /* vert timings */
    temp = (mode->crtc_vtotal) - 2;
    if (temp & 0x100)
        jreg07 |= 0x01;
    if (temp & 0x200)
        jreg07 |= 0x20;
    if (temp & 0x400)
        jregAE |= 0x01;
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x06, 0x00, temp);

    temp = (mode->crtc_vsync_start) - 1;
    if (temp & 0x100)
        jreg07 |= 0x04;
    if (temp & 0x200)
        jreg07 |= 0x80;
    if (temp & 0x400)
        jregAE |= 0x08;
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x10, 0x00, temp);

    temp = (mode->crtc_vsync_end - 1) & 0x3f;
    if (temp & 0x10)
        jregAE |= 0x20;
    if (temp & 0x20)
        jregAE |= 0x40;
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x11, 0x70, temp & 0xf);

    temp = mode->crtc_vdisplay - 1;
    if (temp & 0x100)
        jreg07 |= 0x02;
    if (temp & 0x200)
        jreg07 |= 0x40;
    if (temp & 0x400)
        jregAE |= 0x02;
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x12, 0x00, temp);

    temp = mode->crtc_vblank_start - 1;
    if (temp & 0x100)
        jreg07 |= 0x08;
    if (temp & 0x200)
        jreg09 |= 0x20;
    if (temp & 0x400)
        jregAE |= 0x04;
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x15, 0x00, temp);

    temp = mode->crtc_vblank_end - 1;
    if (temp & 0x100)
        jregAE |= 0x10;
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x16, 0x00, temp);

    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x07, 0x00, jreg07);
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x09, 0xdf, jreg09);
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xAE, 0x00, (jregAE | 0x80));

    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x11, 0x7f, 0x80);
}

static void ast_set_offset_reg(struct drm_crtc *crtc)
{
    struct ast_private *ast = crtc->dev->dev_private;

    u16 offset;

    offset = crtc->fb->pitches[0] >> 3;
    ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x13, (offset & 0xff));
    ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xb0, (offset >> 8) & 0x3f);
}

static void ast_set_dclk_reg(struct drm_device *dev, struct drm_display_mode *mode,
                 struct ast_vbios_mode_info *vbios_mode)
{
    struct ast_private *ast = dev->dev_private;
    struct ast_vbios_dclk_info *clk_info;

    clk_info = &dclk_table[vbios_mode->enh_table->dclk_index];

    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xc0, 0x00, clk_info->param1);
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xc1, 0x00, clk_info->param2);
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xbb, 0x0f,
                   (clk_info->param3 & 0x80) | ((clk_info->param3 & 0x3) << 4));
}

static void ast_set_ext_reg(struct drm_crtc *crtc, struct drm_display_mode *mode,
                 struct ast_vbios_mode_info *vbios_mode)
{
    struct ast_private *ast = crtc->dev->dev_private;
    u8 jregA0 = 0, jregA3 = 0, jregA8 = 0;

    switch (crtc->fb->bits_per_pixel) {
    case 8:
        jregA0 = 0x70;
        jregA3 = 0x01;
        jregA8 = 0x00;
        break;
    case 15:
    case 16:
        jregA0 = 0x70;
        jregA3 = 0x04;
        jregA8 = 0x02;
        break;
    case 32:
        jregA0 = 0x70;
        jregA3 = 0x08;
        jregA8 = 0x02;
        break;
    }

    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xa0, 0x8f, jregA0);
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xa3, 0xf0, jregA3);
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xa8, 0xfd, jregA8);

    /* Set Threshold */
    if (ast->chip == AST2300) {
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa7, 0x78);
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa6, 0x60);
    } else if (ast->chip == AST2100 ||
           ast->chip == AST1100 ||
           ast->chip == AST2200 ||
           ast->chip == AST2150) {
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa7, 0x3f);
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa6, 0x2f);
    } else {
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa7, 0x2f);
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa6, 0x1f);
    }
}

void ast_set_sync_reg(struct drm_device *dev, struct drm_display_mode *mode,
              struct ast_vbios_mode_info *vbios_mode)
{
    struct ast_private *ast = dev->dev_private;
    u8 jreg;

    jreg = ast_io_read8(ast, AST_IO_MISC_PORT_READ);
    jreg |= (vbios_mode->enh_table->flags & SyncNN);
    ast_io_write8(ast, AST_IO_MISC_PORT_WRITE, jreg);
}

bool ast_set_dac_reg(struct drm_crtc *crtc, struct drm_display_mode *mode,
             struct ast_vbios_mode_info *vbios_mode)
{
    switch (crtc->fb->bits_per_pixel) {
    case 8:
        break;
    default:
        return false;
    }
    return true;
}

void ast_set_start_address_crt1(struct drm_crtc *crtc, unsigned offset)
{
    struct ast_private *ast = crtc->dev->dev_private;
    u32 addr;

    addr = offset >> 2;
    ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x0d, (u8)(addr & 0xff));
    ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x0c, (u8)((addr >> 8) & 0xff));
    ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xaf, (u8)((addr >> 16) & 0xff));

}

static void ast_crtc_dpms(struct drm_crtc *crtc, int mode)
{
    struct ast_private *ast = crtc->dev->dev_private;

    if (ast->chip == AST1180)
        return;

    switch (mode) {
    case DRM_MODE_DPMS_ON:
    case DRM_MODE_DPMS_STANDBY:
    case DRM_MODE_DPMS_SUSPEND:
        ast_set_index_reg_mask(ast, AST_IO_SEQ_PORT, 0x1, 0xdf, 0);
        ast_crtc_load_lut(crtc);
        break;
    case DRM_MODE_DPMS_OFF:
        ast_set_index_reg_mask(ast, AST_IO_SEQ_PORT, 0x1, 0xdf, 0x20);
        break;
    }
}

static bool ast_crtc_mode_fixup(struct drm_crtc *crtc,
                const struct drm_display_mode *mode,
                struct drm_display_mode *adjusted_mode)
{
    return true;
}

/* ast is different - we will force move buffers out of VRAM */
static int ast_crtc_do_set_base(struct drm_crtc *crtc,
                struct drm_framebuffer *fb,
                int x, int y, int atomic)
{
    struct ast_private *ast = crtc->dev->dev_private;
    struct drm_gem_object *obj;
    struct ast_framebuffer *ast_fb;
    struct ast_bo *bo;
    int ret;
    u64 gpu_addr;

    /* push the previous fb to system ram */
    if (!atomic && fb) {
        ast_fb = to_ast_framebuffer(fb);
        obj = ast_fb->obj;
        bo = gem_to_ast_bo(obj);
        ret = ast_bo_reserve(bo, false);
        if (ret)
            return ret;
        ast_bo_push_sysram(bo);
        ast_bo_unreserve(bo);
    }

    ast_fb = to_ast_framebuffer(crtc->fb);
    obj = ast_fb->obj;
    bo = gem_to_ast_bo(obj);

    ret = ast_bo_reserve(bo, false);
    if (ret)
        return ret;

    ret = ast_bo_pin(bo, TTM_PL_FLAG_VRAM, &gpu_addr);
    if (ret) {
        ast_bo_unreserve(bo);
        return ret;
    }

    if (&ast->fbdev->afb == ast_fb) {
        /* if pushing console in kmap it */
        ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
        if (ret)
            DRM_ERROR("failed to kmap fbcon\n");
    }
    ast_bo_unreserve(bo);

    ast_set_start_address_crt1(crtc, (u32)gpu_addr);

    return 0;
}

static int ast_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
                 struct drm_framebuffer *old_fb)
{
    return ast_crtc_do_set_base(crtc, old_fb, x, y, 0);
}

static int ast_crtc_mode_set(struct drm_crtc *crtc,
                 struct drm_display_mode *mode,
                 struct drm_display_mode *adjusted_mode,
                 int x, int y,
                 struct drm_framebuffer *old_fb)
{
    struct drm_device *dev = crtc->dev;
    struct ast_private *ast = crtc->dev->dev_private;
    struct ast_vbios_mode_info vbios_mode;
    bool ret;
    if (ast->chip == AST1180) {
        DRM_ERROR("AST 1180 modesetting not supported\n");
        return -EINVAL;
    }

    ret = ast_get_vbios_mode_info(crtc, mode, adjusted_mode, &vbios_mode);
    if (ret == false)
        return -EINVAL;
    ast_open_key(ast);

    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xa1, 0xff, 0x04);

    ast_set_std_reg(crtc, adjusted_mode, &vbios_mode);
    ast_set_crtc_reg(crtc, adjusted_mode, &vbios_mode);
    ast_set_offset_reg(crtc);
    ast_set_dclk_reg(dev, adjusted_mode, &vbios_mode);
    ast_set_ext_reg(crtc, adjusted_mode, &vbios_mode);
    ast_set_sync_reg(dev, adjusted_mode, &vbios_mode);
    ast_set_dac_reg(crtc, adjusted_mode, &vbios_mode);

    ast_crtc_mode_set_base(crtc, x, y, old_fb);

    return 0;
}

static void ast_crtc_disable(struct drm_crtc *crtc)
{

}

static void ast_crtc_prepare(struct drm_crtc *crtc)
{

}

static void ast_crtc_commit(struct drm_crtc *crtc)
{
    struct ast_private *ast = crtc->dev->dev_private;
    ast_set_index_reg_mask(ast, AST_IO_SEQ_PORT, 0x1, 0xdf, 0);
}


static const struct drm_crtc_helper_funcs ast_crtc_helper_funcs = {
    .dpms = ast_crtc_dpms,
    .mode_fixup = ast_crtc_mode_fixup,
    .mode_set = ast_crtc_mode_set,
    .mode_set_base = ast_crtc_mode_set_base,
    .disable = ast_crtc_disable,
    .load_lut = ast_crtc_load_lut,
    .prepare = ast_crtc_prepare,
    .commit = ast_crtc_commit,

};

static void ast_crtc_reset(struct drm_crtc *crtc)
{

}

static void ast_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
                 u16 *blue, uint32_t start, uint32_t size)
{
    struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
    int end = (start + size > 256) ? 256 : start + size, i;

    /* userspace palettes are always correct as is */
    for (i = start; i < end; i++) {
        ast_crtc->lut_r[i] = red[i] >> 8;
        ast_crtc->lut_g[i] = green[i] >> 8;
        ast_crtc->lut_b[i] = blue[i] >> 8;
    }
    ast_crtc_load_lut(crtc);
}


static void ast_crtc_destroy(struct drm_crtc *crtc)
{
    drm_crtc_cleanup(crtc);
    kfree(crtc);
}

static const struct drm_crtc_funcs ast_crtc_funcs = {
    .cursor_set = ast_cursor_set,
    .cursor_move = ast_cursor_move,
    .reset = ast_crtc_reset,
    .set_config = drm_crtc_helper_set_config,
    .gamma_set = ast_crtc_gamma_set,
    .destroy = ast_crtc_destroy,
};

int ast_crtc_init(struct drm_device *dev)
{
    struct ast_crtc *crtc;
    int i;

    crtc = kzalloc(sizeof(struct ast_crtc), GFP_KERNEL);
    if (!crtc)
        return -ENOMEM;

    drm_crtc_init(dev, &crtc->base, &ast_crtc_funcs);
    drm_mode_crtc_set_gamma_size(&crtc->base, 256);
    drm_crtc_helper_add(&crtc->base, &ast_crtc_helper_funcs);

    for (i = 0; i < 256; i++) {
        crtc->lut_r[i] = i;
        crtc->lut_g[i] = i;
        crtc->lut_b[i] = i;
    }
    return 0;
}

static void ast_encoder_destroy(struct drm_encoder *encoder)
{
    drm_encoder_cleanup(encoder);
    kfree(encoder);
}


static struct drm_encoder *ast_best_single_encoder(struct drm_connector *connector)
{
    int enc_id = connector->encoder_ids[0];
    struct drm_mode_object *obj;
    struct drm_encoder *encoder;

    /* pick the encoder ids */
    if (enc_id) {
        obj = drm_mode_object_find(connector->dev, enc_id, DRM_MODE_OBJECT_ENCODER);
        if (!obj)
            return NULL;
        encoder = obj_to_encoder(obj);
        return encoder;
    }
    return NULL;
}


static const struct drm_encoder_funcs ast_enc_funcs = {
    .destroy = ast_encoder_destroy,
};

static void ast_encoder_dpms(struct drm_encoder *encoder, int mode)
{

}

static bool ast_mode_fixup(struct drm_encoder *encoder,
               const struct drm_display_mode *mode,
               struct drm_display_mode *adjusted_mode)
{
    return true;
}

static void ast_encoder_mode_set(struct drm_encoder *encoder,
                   struct drm_display_mode *mode,
                   struct drm_display_mode *adjusted_mode)
{
}

static void ast_encoder_prepare(struct drm_encoder *encoder)
{

}

static void ast_encoder_commit(struct drm_encoder *encoder)
{

}


static const struct drm_encoder_helper_funcs ast_enc_helper_funcs = {
    .dpms = ast_encoder_dpms,
    .mode_fixup = ast_mode_fixup,
    .prepare = ast_encoder_prepare,
    .commit = ast_encoder_commit,
    .mode_set = ast_encoder_mode_set,
};

int ast_encoder_init(struct drm_device *dev)
{
    struct ast_encoder *ast_encoder;

    ast_encoder = kzalloc(sizeof(struct ast_encoder), GFP_KERNEL);
    if (!ast_encoder)
        return -ENOMEM;

    drm_encoder_init(dev, &ast_encoder->base, &ast_enc_funcs,
             DRM_MODE_ENCODER_DAC);
    drm_encoder_helper_add(&ast_encoder->base, &ast_enc_helper_funcs);

    ast_encoder->base.possible_crtcs = 1;
    return 0;
}

static int ast_get_modes(struct drm_connector *connector)
{
    struct ast_connector *ast_connector = to_ast_connector(connector);
    struct edid *edid;
    int ret;

    edid = drm_get_edid(connector, &ast_connector->i2c->adapter);
    if (edid) {
        drm_mode_connector_update_edid_property(&ast_connector->base, edid);
        ret = drm_add_edid_modes(connector, edid);
        kfree(edid);
        return ret;
    } else
        drm_mode_connector_update_edid_property(&ast_connector->base, NULL);
    return 0;
}

static int ast_mode_valid(struct drm_connector *connector,
              struct drm_display_mode *mode)
{
    return MODE_OK;
}

static void ast_connector_destroy(struct drm_connector *connector)
{
    struct ast_connector *ast_connector = to_ast_connector(connector);
    ast_i2c_destroy(ast_connector->i2c);
    drm_sysfs_connector_remove(connector);
    drm_connector_cleanup(connector);
    kfree(connector);
}

static enum drm_connector_status
ast_connector_detect(struct drm_connector *connector, bool force)
{
    return connector_status_connected;
}

static const struct drm_connector_helper_funcs ast_connector_helper_funcs = {
    .mode_valid = ast_mode_valid,
    .get_modes = ast_get_modes,
    .best_encoder = ast_best_single_encoder,
};

static const struct drm_connector_funcs ast_connector_funcs = {
    .dpms = drm_helper_connector_dpms,
    .detect = ast_connector_detect,
    .fill_modes = drm_helper_probe_single_connector_modes,
    .destroy = ast_connector_destroy,
};

int ast_connector_init(struct drm_device *dev)
{
    struct ast_connector *ast_connector;
    struct drm_connector *connector;
    struct drm_encoder *encoder;

    ast_connector = kzalloc(sizeof(struct ast_connector), GFP_KERNEL);
    if (!ast_connector)
        return -ENOMEM;

    connector = &ast_connector->base;
    drm_connector_init(dev, connector, &ast_connector_funcs, DRM_MODE_CONNECTOR_VGA);

    drm_connector_helper_add(connector, &ast_connector_helper_funcs);

    connector->interlace_allowed = 0;
    connector->doublescan_allowed = 0;

    drm_sysfs_connector_add(connector);

    connector->polled = DRM_CONNECTOR_POLL_CONNECT;

    encoder = list_first_entry(&dev->mode_config.encoder_list, struct drm_encoder, head);
    drm_mode_connector_attach_encoder(connector, encoder);

    ast_connector->i2c = ast_i2c_create(dev);
    if (!ast_connector->i2c)
        DRM_ERROR("failed to add ddc bus for connector\n");

    return 0;
}

/* allocate cursor cache and pin at start of VRAM */
int ast_cursor_init(struct drm_device *dev)
{
    struct ast_private *ast = dev->dev_private;
    int size;
    int ret;
    struct drm_gem_object *obj;
    struct ast_bo *bo;
    uint64_t gpu_addr;

    size = (AST_HWC_SIZE + AST_HWC_SIGNATURE_SIZE) * AST_DEFAULT_HWC_NUM;

    ret = ast_gem_create(dev, size, true, &obj);
    if (ret)
        return ret;
    bo = gem_to_ast_bo(obj);
    ret = ast_bo_reserve(bo, false);
    if (unlikely(ret != 0))
        goto fail;

    ret = ast_bo_pin(bo, TTM_PL_FLAG_VRAM, &gpu_addr);
    ast_bo_unreserve(bo);
    if (ret)
        goto fail;

    /* kmap the object */
    ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &ast->cache_kmap);
    if (ret)
        goto fail;

    ast->cursor_cache = obj;
    ast->cursor_cache_gpu_addr = gpu_addr;
    DRM_DEBUG_KMS("pinned cursor cache at %llx\n", ast->cursor_cache_gpu_addr);
    return 0;
fail:
    return ret;
}

void ast_cursor_fini(struct drm_device *dev)
{
    struct ast_private *ast = dev->dev_private;
    ttm_bo_kunmap(&ast->cache_kmap);
    drm_gem_object_unreference_unlocked(ast->cursor_cache);
}

int ast_mode_init(struct drm_device *dev)
{
    ast_cursor_init(dev);
    ast_crtc_init(dev);
    ast_encoder_init(dev);
    ast_connector_init(dev);
    return 0;
}

void ast_mode_fini(struct drm_device *dev)
{
    ast_cursor_fini(dev);
}

static int get_clock(void *i2c_priv)
{
    struct ast_i2c_chan *i2c = i2c_priv;
    struct ast_private *ast = i2c->dev->dev_private;
    uint32_t val;

    val = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4;
    return val & 1 ? 1 : 0;
}

static int get_data(void *i2c_priv)
{
    struct ast_i2c_chan *i2c = i2c_priv;
    struct ast_private *ast = i2c->dev->dev_private;
    uint32_t val;

    val = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x20) >> 5;
    return val & 1 ? 1 : 0;
}

static void set_clock(void *i2c_priv, int clock)
{
    struct ast_i2c_chan *i2c = i2c_priv;
    struct ast_private *ast = i2c->dev->dev_private;
    int i;
    u8 ujcrb7, jtemp;

    for (i = 0; i < 0x10000; i++) {
        ujcrb7 = ((clock & 0x01) ? 0 : 1);
        ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0xfe, ujcrb7);
        jtemp = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x01);
        if (ujcrb7 == jtemp)
            break;
    }
}

static void set_data(void *i2c_priv, int data)
{
    struct ast_i2c_chan *i2c = i2c_priv;
    struct ast_private *ast = i2c->dev->dev_private;
    int i;
    u8 ujcrb7, jtemp;

    for (i = 0; i < 0x10000; i++) {
        ujcrb7 = ((data & 0x01) ? 0 : 1) << 2;
        ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0xfb, ujcrb7);
        jtemp = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x04);
        if (ujcrb7 == jtemp)
            break;
    }
}

static struct ast_i2c_chan *ast_i2c_create(struct drm_device *dev)
{
    struct ast_i2c_chan *i2c;
    int ret;

    i2c = kzalloc(sizeof(struct ast_i2c_chan), GFP_KERNEL);
    if (!i2c)
        return NULL;

    i2c->adapter.owner = THIS_MODULE;
    i2c->adapter.class = I2C_CLASS_DDC;
    i2c->adapter.dev.parent = &dev->pdev->dev;
    i2c->dev = dev;
    i2c_set_adapdata(&i2c->adapter, i2c);
    snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
         "AST i2c bit bus");
    i2c->adapter.algo_data = &i2c->bit;

    i2c->bit.udelay = 20;
    i2c->bit.timeout = 2;
    i2c->bit.data = i2c;
    i2c->bit.setsda = set_data;
    i2c->bit.setscl = set_clock;
    i2c->bit.getsda = get_data;
    i2c->bit.getscl = get_clock;
    ret = i2c_bit_add_bus(&i2c->adapter);
    if (ret) {
        DRM_ERROR("Failed to register bit i2c\n");
        goto out_free;
    }

    return i2c;
out_free:
    kfree(i2c);
    return NULL;
}

static void ast_i2c_destroy(struct ast_i2c_chan *i2c)
{
    if (!i2c)
        return;
    i2c_del_adapter(&i2c->adapter);
    kfree(i2c);
}

void ast_show_cursor(struct drm_crtc *crtc)
{
    struct ast_private *ast = crtc->dev->dev_private;
    u8 jreg;

    jreg = 0x2;
    /* enable ARGB cursor */
    jreg |= 1;
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xcb, 0xfc, jreg);
}

void ast_hide_cursor(struct drm_crtc *crtc)
{
    struct ast_private *ast = crtc->dev->dev_private;
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xcb, 0xfc, 0x00);
}

static u32 copy_cursor_image(u8 *src, u8 *dst, int width, int height)
{
    union {
        u32 ul;
        u8 b[4];
    } srcdata32[2], data32;
    union {
        u16 us;
        u8 b[2];
    } data16;
    u32 csum = 0;
    s32 alpha_dst_delta, last_alpha_dst_delta;
    u8 *srcxor, *dstxor;
    int i, j;
    u32 per_pixel_copy, two_pixel_copy;

    alpha_dst_delta = AST_MAX_HWC_WIDTH << 1;
    last_alpha_dst_delta = alpha_dst_delta - (width << 1);

    srcxor = src;
    dstxor = (u8 *)dst + last_alpha_dst_delta + (AST_MAX_HWC_HEIGHT - height) * alpha_dst_delta;
    per_pixel_copy = width & 1;
    two_pixel_copy = width >> 1;

    for (j = 0; j < height; j++) {
        for (i = 0; i < two_pixel_copy; i++) {
            srcdata32[0].ul = *((u32 *)srcxor) & 0xf0f0f0f0;
            srcdata32[1].ul = *((u32 *)(srcxor + 4)) & 0xf0f0f0f0;
            data32.b[0] = srcdata32[0].b[1] | (srcdata32[0].b[0] >> 4);
            data32.b[1] = srcdata32[0].b[3] | (srcdata32[0].b[2] >> 4);
            data32.b[2] = srcdata32[0].b[1] | (srcdata32[1].b[0] >> 4);
            data32.b[3] = srcdata32[0].b[3] | (srcdata32[1].b[2] >> 4);

            writel(data32.ul, dstxor);
            csum += data32.ul;

            dstxor += 4;
            srcxor += 8;

        }

        for (i = 0; i < per_pixel_copy; i++) {
            srcdata32[0].ul = *((u32 *)srcxor) & 0xf0f0f0f0;
            data16.b[0] = srcdata32[0].b[1] | (srcdata32[0].b[0] >> 4);
            data16.b[1] = srcdata32[0].b[3] | (srcdata32[0].b[2] >> 4);
            writew(data16.us, dstxor);
            csum += (u32)data16.us;

            dstxor += 2;
            srcxor += 4;
        }
        dstxor += last_alpha_dst_delta;
    }
    return csum;
}

static int ast_cursor_set(struct drm_crtc *crtc,
              struct drm_file *file_priv,
              uint32_t handle,
              uint32_t width,
              uint32_t height)
{
    struct ast_private *ast = crtc->dev->dev_private;
    struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
    struct drm_gem_object *obj;
    struct ast_bo *bo;
    uint64_t gpu_addr;
    u32 csum;
    int ret;
    struct ttm_bo_kmap_obj uobj_map;
    u8 *src, *dst;
    bool src_isiomem, dst_isiomem;
    if (!handle) {
        ast_hide_cursor(crtc);
        return 0;
    }

    if (width > AST_MAX_HWC_WIDTH || height > AST_MAX_HWC_HEIGHT)
        return -EINVAL;

    obj = drm_gem_object_lookup(crtc->dev, file_priv, handle);
    if (!obj) {
        DRM_ERROR("Cannot find cursor object %x for crtc\n", handle);
        return -ENOENT;
    }
    bo = gem_to_ast_bo(obj);

    ret = ast_bo_reserve(bo, false);
    if (ret)
        goto fail;

    ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &uobj_map);

    src = ttm_kmap_obj_virtual(&uobj_map, &src_isiomem);
    dst = ttm_kmap_obj_virtual(&ast->cache_kmap, &dst_isiomem);

    if (src_isiomem == true)
        DRM_ERROR("src cursor bo should be in main memory\n");
    if (dst_isiomem == false)
        DRM_ERROR("dst bo should be in VRAM\n");

    dst += (AST_HWC_SIZE + AST_HWC_SIGNATURE_SIZE)*ast->next_cursor;

    /* do data transfer to cursor cache */
    csum = copy_cursor_image(src, dst, width, height);

    /* write checksum + signature */
    ttm_bo_kunmap(&uobj_map);
    ast_bo_unreserve(bo);
    {
        u8 *dst = (u8 *)ast->cache_kmap.virtual + (AST_HWC_SIZE + AST_HWC_SIGNATURE_SIZE)*ast->next_cursor + AST_HWC_SIZE;
        writel(csum, dst);
        writel(width, dst + AST_HWC_SIGNATURE_SizeX);
        writel(height, dst + AST_HWC_SIGNATURE_SizeY);
        writel(0, dst + AST_HWC_SIGNATURE_HOTSPOTX);
        writel(0, dst + AST_HWC_SIGNATURE_HOTSPOTY);

        /* set pattern offset */
        gpu_addr = ast->cursor_cache_gpu_addr;
        gpu_addr += (AST_HWC_SIZE + AST_HWC_SIGNATURE_SIZE)*ast->next_cursor;
        gpu_addr >>= 3;
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xc8, gpu_addr & 0xff);
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xc9, (gpu_addr >> 8) & 0xff);
        ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xca, (gpu_addr >> 16) & 0xff);
    }
    ast_crtc->cursor_width = width;
    ast_crtc->cursor_height = height;
    ast_crtc->offset_x = AST_MAX_HWC_WIDTH - width;
    ast_crtc->offset_y = AST_MAX_HWC_WIDTH - height;

    ast->next_cursor = (ast->next_cursor + 1) % AST_DEFAULT_HWC_NUM;

    ast_show_cursor(crtc);

    drm_gem_object_unreference_unlocked(obj);
    return 0;
fail:
    drm_gem_object_unreference_unlocked(obj);
    return ret;
}

static int ast_cursor_move(struct drm_crtc *crtc,
               int x, int y)
{
    struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
    struct ast_private *ast = crtc->dev->dev_private;
    int x_offset, y_offset;
    u8 *sig;

    sig = (u8 *)ast->cache_kmap.virtual + (AST_HWC_SIZE + AST_HWC_SIGNATURE_SIZE)*ast->next_cursor + AST_HWC_SIZE;
    writel(x, sig + AST_HWC_SIGNATURE_X);
    writel(y, sig + AST_HWC_SIGNATURE_Y);

    x_offset = ast_crtc->offset_x;
    y_offset = ast_crtc->offset_y;
    if (x < 0) {
        x_offset = (-x) + ast_crtc->offset_x;
        x = 0;
    }

    if (y < 0) {
        y_offset = (-y) + ast_crtc->offset_y;
        y = 0;
    }
    ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xc2, x_offset);
    ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xc3, y_offset);
    ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xc4, (x & 0xff));
    ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xc5, ((x >> 8) & 0x0f));
    ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xc6, (y & 0xff));
    ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xc7, ((y >> 8) & 0x07));

    /* dummy write to fire HWC */
    ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xCB, 0xFF, 0x00);

    return 0;
}