/*
 * Copyright (C) 2009
 * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */
#include <common.h>
#include <lcd.h>
#include <asm/arch/mx31.h>
#include <asm/arch/mx31-regs.h>
#include <asm/errno.h>

DECLARE_GLOBAL_DATA_PTR;

void *lcd_base;                 /* Start of framebuffer memory  */
void *lcd_console_address;      /* Start of console buffer      */

int lcd_line_length;
int lcd_color_fg;
int lcd_color_bg;

short console_col;
short console_row;

void lcd_initcolregs(void)
{
}

void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
{
}

void lcd_disable(void)
{
}

void lcd_panel_disable(void)
{
}

#define msleep(a) udelay(a * 1000)

#if defined(CONFIG_DISPLAY_VBEST_VGG322403)
#define XRES            320
#define YRES            240
#define PANEL_TYPE      IPU_PANEL_TFT
#define PIXEL_CLK       156000
#define PIXEL_FMT       IPU_PIX_FMT_RGB666
#define H_START_WIDTH   20              /* left_margin */
#define H_SYNC_WIDTH    30              /* hsync_len */
#define H_END_WIDTH     (38 + 30)       /* right_margin + hsync_len */
#define V_START_WIDTH   7               /* upper_margin */
#define V_SYNC_WIDTH    3               /* vsync_len */
#define V_END_WIDTH     (26 + 3)        /* lower_margin + vsync_len */
#define SIG_POL         (DI_D3_DRDY_SHARP_POL | DI_D3_CLK_POL)
#define IF_CONF         0
#define IF_CLK_DIV      0x175
#elif defined(CONFIG_DISPLAY_COM57H5M10XRC)
#define XRES            640
#define YRES            480
#define PANEL_TYPE      IPU_PANEL_TFT
#define PIXEL_CLK       40000
#define PIXEL_FMT       IPU_PIX_FMT_RGB666
#define H_START_WIDTH   120             /* left_margin */
#define H_SYNC_WIDTH    30              /* hsync_len */
#define H_END_WIDTH     (10 + 30)       /* right_margin + hsync_len */
#define V_START_WIDTH   35              /* upper_margin */
#define V_SYNC_WIDTH    3               /* vsync_len */
#define V_END_WIDTH     (7 + 3) /* lower_margin + vsync_len */
#define SIG_POL         (DI_D3_DRDY_SHARP_POL | DI_D3_CLK_POL)
#define IF_CONF         0
#define IF_CLK_DIV      0x55
#else
#define XRES            240
#define YRES            320
#define PANEL_TYPE      IPU_PANEL_TFT
#define PIXEL_CLK       185925
#define PIXEL_FMT       IPU_PIX_FMT_RGB666
#define H_START_WIDTH   9               /* left_margin */
#define H_SYNC_WIDTH    1               /* hsync_len */
#define H_END_WIDTH     (16 + 1)        /* right_margin + hsync_len */
#define V_START_WIDTH   7               /* upper_margin */
#define V_SYNC_WIDTH    1               /* vsync_len */
#define V_END_WIDTH     (9 + 1)         /* lower_margin + vsync_len */
#define SIG_POL         (DI_D3_DRDY_SHARP_POL | DI_D3_CLK_POL)
#define IF_CONF         0
#define IF_CLK_DIV      0x175
#endif

#define LCD_COLOR_IPU   LCD_COLOR16

static ushort colormap[256];

vidinfo_t panel_info = {
        .vl_col         = XRES,
        .vl_row         = YRES,
        .vl_bpix        = LCD_COLOR_IPU,
        .cmap           = colormap,
};

#define BIT_PER_PIXEL   NBITS(LCD_COLOR_IPU)

/* IPU DMA Controller channel definitions. */
enum ipu_channel {
        IDMAC_IC_0 = 0,         /* IC (encoding task) to memory */
        IDMAC_IC_1 = 1,         /* IC (viewfinder task) to memory */
        IDMAC_ADC_0 = 1,
        IDMAC_IC_2 = 2,
        IDMAC_ADC_1 = 2,
        IDMAC_IC_3 = 3,
        IDMAC_IC_4 = 4,
        IDMAC_IC_5 = 5,
        IDMAC_IC_6 = 6,
        IDMAC_IC_7 = 7,         /* IC (sensor data) to memory */
        IDMAC_IC_8 = 8,
        IDMAC_IC_9 = 9,
        IDMAC_IC_10 = 10,
        IDMAC_IC_11 = 11,
        IDMAC_IC_12 = 12,
        IDMAC_IC_13 = 13,
        IDMAC_SDC_0 = 14,       /* Background synchronous display data */
        IDMAC_SDC_1 = 15,       /* Foreground data (overlay) */
        IDMAC_SDC_2 = 16,
        IDMAC_SDC_3 = 17,
        IDMAC_ADC_2 = 18,
        IDMAC_ADC_3 = 19,
        IDMAC_ADC_4 = 20,
        IDMAC_ADC_5 = 21,
        IDMAC_ADC_6 = 22,
        IDMAC_ADC_7 = 23,
        IDMAC_PF_0 = 24,
        IDMAC_PF_1 = 25,
        IDMAC_PF_2 = 26,
        IDMAC_PF_3 = 27,
        IDMAC_PF_4 = 28,
        IDMAC_PF_5 = 29,
        IDMAC_PF_6 = 30,
        IDMAC_PF_7 = 31,
};

/* More formats can be copied from the Linux driver if needed */
enum pixel_fmt {
        /* 2 bytes */
        IPU_PIX_FMT_RGB565,
        IPU_PIX_FMT_RGB666,
        IPU_PIX_FMT_BGR666,
        /* 3 bytes */
        IPU_PIX_FMT_RGB24,
};

struct pixel_fmt_cfg {
        u32     b0;
        u32     b1;
        u32     b2;
        u32     acc;
};

static struct pixel_fmt_cfg fmt_cfg[] = {
        [IPU_PIX_FMT_RGB24] = {
                0x1600AAAA, 0x00E05555, 0x00070000, 3,
        },
        [IPU_PIX_FMT_RGB666] = {
                0x0005000F, 0x000B000F, 0x0011000F, 1,
        },
        [IPU_PIX_FMT_BGR666] = {
                0x0011000F, 0x000B000F, 0x0005000F, 1,
        },
        [IPU_PIX_FMT_RGB565] = {
                0x0004003F, 0x000A000F, 0x000F003F, 1,
        }
};

enum ipu_panel {
        IPU_PANEL_SHARP_TFT,
        IPU_PANEL_TFT,
};

/* IPU Common registers */
/* IPU_CONF and its bits already defined in mx31-regs.h */
#define IPU_CHA_BUF0_RDY        (0x04 + IPU_BASE)
#define IPU_CHA_BUF1_RDY        (0x08 + IPU_BASE)
#define IPU_CHA_DB_MODE_SEL     (0x0C + IPU_BASE)
#define IPU_CHA_CUR_BUF         (0x10 + IPU_BASE)
#define IPU_FS_PROC_FLOW        (0x14 + IPU_BASE)
#define IPU_FS_DISP_FLOW        (0x18 + IPU_BASE)
#define IPU_TASKS_STAT          (0x1C + IPU_BASE)
#define IPU_IMA_ADDR            (0x20 + IPU_BASE)
#define IPU_IMA_DATA            (0x24 + IPU_BASE)
#define IPU_INT_CTRL_1          (0x28 + IPU_BASE)
#define IPU_INT_CTRL_2          (0x2C + IPU_BASE)
#define IPU_INT_CTRL_3          (0x30 + IPU_BASE)
#define IPU_INT_CTRL_4          (0x34 + IPU_BASE)
#define IPU_INT_CTRL_5          (0x38 + IPU_BASE)
#define IPU_INT_STAT_1          (0x3C + IPU_BASE)
#define IPU_INT_STAT_2          (0x40 + IPU_BASE)
#define IPU_INT_STAT_3          (0x44 + IPU_BASE)
#define IPU_INT_STAT_4          (0x48 + IPU_BASE)
#define IPU_INT_STAT_5          (0x4C + IPU_BASE)
#define IPU_BRK_CTRL_1          (0x50 + IPU_BASE)
#define IPU_BRK_CTRL_2          (0x54 + IPU_BASE)
#define IPU_BRK_STAT            (0x58 + IPU_BASE)
#define IPU_DIAGB_CTRL          (0x5C + IPU_BASE)

/* Image Converter Registers */
#define IC_CONF                 (0x88 + IPU_BASE)
#define IC_PRP_ENC_RSC          (0x8C + IPU_BASE)
#define IC_PRP_VF_RSC           (0x90 + IPU_BASE)
#define IC_PP_RSC               (0x94 + IPU_BASE)
#define IC_CMBP_1               (0x98 + IPU_BASE)
#define IC_CMBP_2               (0x9C + IPU_BASE)
#define PF_CONF                 (0xA0 + IPU_BASE)
#define IDMAC_CONF              (0xA4 + IPU_BASE)
#define IDMAC_CHA_EN            (0xA8 + IPU_BASE)
#define IDMAC_CHA_PRI           (0xAC + IPU_BASE)
#define IDMAC_CHA_BUSY          (0xB0 + IPU_BASE)

/* Image Converter Register bits */
#define IC_CONF_PRPENC_EN       0x00000001
#define IC_CONF_PRPENC_CSC1     0x00000002
#define IC_CONF_PRPENC_ROT_EN   0x00000004
#define IC_CONF_PRPVF_EN        0x00000100
#define IC_CONF_PRPVF_CSC1      0x00000200
#define IC_CONF_PRPVF_CSC2      0x00000400
#define IC_CONF_PRPVF_CMB       0x00000800
#define IC_CONF_PRPVF_ROT_EN    0x00001000
#define IC_CONF_PP_EN           0x00010000
#define IC_CONF_PP_CSC1         0x00020000
#define IC_CONF_PP_CSC2         0x00040000
#define IC_CONF_PP_CMB          0x00080000
#define IC_CONF_PP_ROT_EN       0x00100000
#define IC_CONF_IC_GLB_LOC_A    0x10000000
#define IC_CONF_KEY_COLOR_EN    0x20000000
#define IC_CONF_RWS_EN          0x40000000
#define IC_CONF_CSI_MEM_WR_EN   0x80000000

/* SDC Registers */
#define SDC_COM_CONF            (0xB4 + IPU_BASE)
#define SDC_GW_CTRL             (0xB8 + IPU_BASE)
#define SDC_FG_POS              (0xBC + IPU_BASE)
#define SDC_BG_POS              (0xC0 + IPU_BASE)
#define SDC_CUR_POS             (0xC4 + IPU_BASE)
#define SDC_PWM_CTRL            (0xC8 + IPU_BASE)
#define SDC_CUR_MAP             (0xCC + IPU_BASE)
#define SDC_HOR_CONF            (0xD0 + IPU_BASE)
#define SDC_VER_CONF            (0xD4 + IPU_BASE)
#define SDC_SHARP_CONF_1        (0xD8 + IPU_BASE)
#define SDC_SHARP_CONF_2        (0xDC + IPU_BASE)

/* Register bits */
#define SDC_COM_TFT_COLOR       0x00000001UL
#define SDC_COM_FG_EN           0x00000010UL
#define SDC_COM_GWSEL           0x00000020UL
#define SDC_COM_GLB_A           0x00000040UL
#define SDC_COM_KEY_COLOR_G     0x00000080UL
#define SDC_COM_BG_EN           0x00000200UL
#define SDC_COM_SHARP           0x00001000UL

#define SDC_V_SYNC_WIDTH_L      0x00000001UL

/* Display Interface registers */
#define DI_DISP_IF_CONF         (0x0124 + IPU_BASE)
#define DI_DISP_SIG_POL         (0x0128 + IPU_BASE)
#define DI_SER_DISP1_CONF       (0x012C + IPU_BASE)
#define DI_SER_DISP2_CONF       (0x0130 + IPU_BASE)
#define DI_HSP_CLK_PER          (0x0134 + IPU_BASE)
#define DI_DISP0_TIME_CONF_1    (0x0138 + IPU_BASE)
#define DI_DISP0_TIME_CONF_2    (0x013C + IPU_BASE)
#define DI_DISP0_TIME_CONF_3    (0x0140 + IPU_BASE)
#define DI_DISP1_TIME_CONF_1    (0x0144 + IPU_BASE)
#define DI_DISP1_TIME_CONF_2    (0x0148 + IPU_BASE)
#define DI_DISP1_TIME_CONF_3    (0x014C + IPU_BASE)
#define DI_DISP2_TIME_CONF_1    (0x0150 + IPU_BASE)
#define DI_DISP2_TIME_CONF_2    (0x0154 + IPU_BASE)
#define DI_DISP2_TIME_CONF_3    (0x0158 + IPU_BASE)
#define DI_DISP3_TIME_CONF      (0x015C + IPU_BASE)
#define DI_DISP0_DB0_MAP        (0x0160 + IPU_BASE)
#define DI_DISP0_DB1_MAP        (0x0164 + IPU_BASE)
#define DI_DISP0_DB2_MAP        (0x0168 + IPU_BASE)
#define DI_DISP0_CB0_MAP        (0x016C + IPU_BASE)
#define DI_DISP0_CB1_MAP        (0x0170 + IPU_BASE)
#define DI_DISP0_CB2_MAP        (0x0174 + IPU_BASE)
#define DI_DISP1_DB0_MAP        (0x0178 + IPU_BASE)
#define DI_DISP1_DB1_MAP        (0x017C + IPU_BASE)
#define DI_DISP1_DB2_MAP        (0x0180 + IPU_BASE)
#define DI_DISP1_CB0_MAP        (0x0184 + IPU_BASE)
#define DI_DISP1_CB1_MAP        (0x0188 + IPU_BASE)
#define DI_DISP1_CB2_MAP        (0x018C + IPU_BASE)
#define DI_DISP2_DB0_MAP        (0x0190 + IPU_BASE)
#define DI_DISP2_DB1_MAP        (0x0194 + IPU_BASE)
#define DI_DISP2_DB2_MAP        (0x0198 + IPU_BASE)
#define DI_DISP2_CB0_MAP        (0x019C + IPU_BASE)
#define DI_DISP2_CB1_MAP        (0x01A0 + IPU_BASE)
#define DI_DISP2_CB2_MAP        (0x01A4 + IPU_BASE)
#define DI_DISP3_B0_MAP         (0x01A8 + IPU_BASE)
#define DI_DISP3_B1_MAP         (0x01AC + IPU_BASE)
#define DI_DISP3_B2_MAP         (0x01B0 + IPU_BASE)
#define DI_DISP_ACC_CC          (0x01B4 + IPU_BASE)
#define DI_DISP_LLA_CONF        (0x01B8 + IPU_BASE)
#define DI_DISP_LLA_DATA        (0x01BC + IPU_BASE)

/* DI_DISP_SIG_POL bits */
#define DI_D3_VSYNC_POL         (1 << 28)
#define DI_D3_HSYNC_POL         (1 << 27)
#define DI_D3_DRDY_SHARP_POL    (1 << 26)
#define DI_D3_CLK_POL           (1 << 25)
#define DI_D3_DATA_POL          (1 << 24)

/* DI_DISP_IF_CONF bits */
#define DI_D3_CLK_IDLE          (1 << 26)
#define DI_D3_CLK_SEL           (1 << 25)
#define DI_D3_DATAMSK           (1 << 24)

#define IOMUX_PADNUM_MASK       0x1ff
#define IOMUX_GPIONUM_SHIFT     9
#define IOMUX_GPIONUM_MASK      (0xff << IOMUX_GPIONUM_SHIFT)

#define IOMUX_PIN(gpionum, padnum) ((padnum) & IOMUX_PADNUM_MASK)

#define IOMUX_MODE_L(pin, mode) IOMUX_MODE(((pin) + 0xc) ^ 3, mode)

struct chan_param_mem_planar {
        /* Word 0 */
        u32     xv:10;
        u32     yv:10;
        u32     xb:12;

        u32     yb:12;
        u32     res1:2;
        u32     nsb:1;
        u32     lnpb:6;
        u32     ubo_l:11;

        u32     ubo_h:15;
        u32     vbo_l:17;

        u32     vbo_h:9;
        u32     res2:3;
        u32     fw:12;
        u32     fh_l:8;

        u32     fh_h:4;
        u32     res3:28;

        /* Word 1 */
        u32     eba0;

        u32     eba1;

        u32     bpp:3;
        u32     sl:14;
        u32     pfs:3;
        u32     bam:3;
        u32     res4:2;
        u32     npb:6;
        u32     res5:1;

        u32     sat:2;
        u32     res6:30;
} __attribute__ ((packed));

struct chan_param_mem_interleaved {
        /* Word 0 */
        u32     xv:10;
        u32     yv:10;
        u32     xb:12;

        u32     yb:12;
        u32     sce:1;
        u32     res1:1;
        u32     nsb:1;
        u32     lnpb:6;
        u32     sx:10;
        u32     sy_l:1;

        u32     sy_h:9;
        u32     ns:10;
        u32     sm:10;
        u32     sdx_l:3;

        u32     sdx_h:2;
        u32     sdy:5;
        u32     sdrx:1;
        u32     sdry:1;
        u32     sdr1:1;
        u32     res2:2;
        u32     fw:12;
        u32     fh_l:8;

        u32     fh_h:4;
        u32     res3:28;

        /* Word 1 */
        u32     eba0;

        u32     eba1;

        u32     bpp:3;
        u32     sl:14;
        u32     pfs:3;
        u32     bam:3;
        u32     res4:2;
        u32     npb:6;
        u32     res5:1;

        u32     sat:2;
        u32     scc:1;
        u32     ofs0:5;
        u32     ofs1:5;
        u32     ofs2:5;
        u32     ofs3:5;
        u32     wid0:3;
        u32     wid1:3;
        u32     wid2:3;

        u32     wid3:3;
        u32     dec_sel:1;
        u32     res6:28;
} __attribute__ ((packed));

union chan_param_mem {
        struct chan_param_mem_planar            pp;
        struct chan_param_mem_interleaved       ip;
};

static inline u32 reg_read(unsigned long reg)
{
        return __REG(reg);
}

static inline void reg_write(u32 value, unsigned long reg)
{
        __REG(reg) = value;
}

/*
 * sdc_init_panel() - initialize a synchronous LCD panel.
 * @width:              width of panel in pixels.
 * @height:             height of panel in pixels.
 * @pixel_fmt:          pixel format of buffer as FOURCC ASCII code.
 * @return:             0 on success or negative error code on failure.
 */
static int sdc_init_panel(u16 width, u16 height, enum pixel_fmt pixel_fmt)
{
        u32 reg;
        uint32_t old_conf;

        /* Init panel size and blanking periods */
        reg = ((H_SYNC_WIDTH - 1) << 26) |
                ((u32)(width + H_START_WIDTH + H_END_WIDTH - 1) << 16);
        reg_write(reg, SDC_HOR_CONF);

        reg = ((V_SYNC_WIDTH - 1) << 26) | SDC_V_SYNC_WIDTH_L |
                ((u32)(height + V_START_WIDTH + V_END_WIDTH - 1) << 16);
        reg_write(reg, SDC_VER_CONF);

        switch (PANEL_TYPE) {
        case IPU_PANEL_SHARP_TFT:
                reg_write(0x00FD0102L, SDC_SHARP_CONF_1);
                reg_write(0x00F500F4L, SDC_SHARP_CONF_2);
                reg_write(SDC_COM_SHARP | SDC_COM_TFT_COLOR, SDC_COM_CONF);
                break;
        case IPU_PANEL_TFT:
                reg_write(SDC_COM_TFT_COLOR, SDC_COM_CONF);
                break;
        default:
                return -EINVAL;
        }

        /* Init clocking */

        /*
         * Calculate divider: fractional part is 4 bits so simply multiple by
         * 2^4 to get fractional part, as long as we stay under ~250MHz and on
         * i.MX31 it (HSP_CLK) is <= 178MHz. Currently 128.267MHz
         */

        reg_write((((IF_CLK_DIV / 8) - 1) << 22) |
                        IF_CLK_DIV, DI_DISP3_TIME_CONF);

        /* DI settings */
        old_conf = reg_read(DI_DISP_IF_CONF) & 0x78FFFFFF;
        reg_write(old_conf | IF_CONF, DI_DISP_IF_CONF);

        old_conf = reg_read(DI_DISP_SIG_POL) & 0xE0FFFFFF;
        reg_write(old_conf | SIG_POL, DI_DISP_SIG_POL);

        reg_write(fmt_cfg[pixel_fmt].b0, DI_DISP3_B0_MAP);
        reg_write(fmt_cfg[pixel_fmt].b1, DI_DISP3_B1_MAP);
        reg_write(fmt_cfg[pixel_fmt].b2, DI_DISP3_B2_MAP);
        reg_write(reg_read(DI_DISP_ACC_CC) |
                  ((fmt_cfg[pixel_fmt].acc - 1) << 12), DI_DISP_ACC_CC);

        return 0;
}

static void ipu_ch_param_set_size(union chan_param_mem *params,
                                  uint32_t pixel_fmt, uint16_t width,
                                  uint16_t height, uint16_t stride)
{
        params->pp.fw           = width - 1;
        params->pp.fh_l         = height - 1;
        params->pp.fh_h         = (height - 1) >> 8;
        params->pp.sl           = stride - 1;

        /* See above, for further formats see the Linux driver */
        switch (pixel_fmt) {
        case IPU_PIX_FMT_RGB565:
                params->ip.bpp  = 2;
                params->ip.pfs  = 4;
                params->ip.npb  = 7;
                params->ip.sat  = 2;            /* SAT = 32-bit access */
                params->ip.ofs0 = 0;            /* Red bit offset */
                params->ip.ofs1 = 5;            /* Green bit offset */
                params->ip.ofs2 = 11;           /* Blue bit offset */
                params->ip.ofs3 = 16;           /* Alpha bit offset */
                params->ip.wid0 = 4;            /* Red bit width - 1 */
                params->ip.wid1 = 5;            /* Green bit width - 1 */
                params->ip.wid2 = 4;            /* Blue bit width - 1 */
                break;
        case IPU_PIX_FMT_RGB24:
                params->ip.bpp  = 1;            /* 24 BPP & RGB PFS */
                params->ip.pfs  = 4;
                params->ip.npb  = 7;
                params->ip.sat  = 2;            /* SAT = 32-bit access */
                params->ip.ofs0 = 16;           /* Red bit offset */
                params->ip.ofs1 = 8;            /* Green bit offset */
                params->ip.ofs2 = 0;            /* Blue bit offset */
                params->ip.ofs3 = 24;           /* Alpha bit offset */
                params->ip.wid0 = 7;            /* Red bit width - 1 */
                params->ip.wid1 = 7;            /* Green bit width - 1 */
                params->ip.wid2 = 7;            /* Blue bit width - 1 */
                break;
        default:
                break;
        }

        params->pp.nsb = 1;
}

static void ipu_ch_param_set_buffer(union chan_param_mem *params,
                                    void *buf0, void *buf1)
{
        params->pp.eba0 = (u32)buf0;
        params->pp.eba1 = (u32)buf1;
}

static void ipu_write_param_mem(uint32_t addr, uint32_t *data,
                                uint32_t num_words)
{
        for (; num_words > 0; num_words--) {
                reg_write(addr, IPU_IMA_ADDR);
                reg_write(*data++, IPU_IMA_DATA);
                addr++;
                if ((addr & 0x7) == 5) {
                        addr &= ~0x7;   /* set to word 0 */
                        addr += 8;      /* increment to next row */
                }
        }
}

static uint32_t bpp_to_pixfmt(int bpp)
{
        switch (bpp) {
        case 16:
                return IPU_PIX_FMT_RGB565;
        default:
                return 0;
        }
}

static uint32_t dma_param_addr(enum ipu_channel channel)
{
        /* Channel Parameter Memory */
        return 0x10000 | (channel << 4);
}

static void ipu_init_channel_buffer(enum ipu_channel channel, void *fbmem)
{
        union chan_param_mem params = {};
        uint32_t reg;
        uint32_t stride_bytes;

        stride_bytes = (XRES * ((BIT_PER_PIXEL + 7) / 8) + 3) & ~3;

        /* Build parameter memory data for DMA channel */
        ipu_ch_param_set_size(&params, bpp_to_pixfmt(BIT_PER_PIXEL),
                              XRES, YRES, stride_bytes);
        ipu_ch_param_set_buffer(&params, fbmem, NULL);
        params.pp.bam = 0;
        /* Some channels (rotation) have restriction on burst length */

        switch (channel) {
        case IDMAC_SDC_0:
                /* In original code only IPU_PIX_FMT_RGB565 was setting burst */
                params.pp.npb = 16 - 1;
                break;
        default:
                break;
        }

        ipu_write_param_mem(dma_param_addr(channel), (uint32_t *)&params, 10);

        /* Disable double-buffering */
        reg = reg_read(IPU_CHA_DB_MODE_SEL);
        reg &= ~(1UL << channel);
        reg_write(reg, IPU_CHA_DB_MODE_SEL);
}

static void ipu_channel_set_priority(enum ipu_channel channel,
                                     int prio)
{
        u32 reg = reg_read(IDMAC_CHA_PRI);

        if (prio)
                reg |= 1UL << channel;
        else
                reg &= ~(1UL << channel);

        reg_write(reg, IDMAC_CHA_PRI);
}

/*
 * ipu_enable_channel() - enable an IPU channel.
 * @channel:    channel ID.
 * @return:     0 on success or negative error code on failure.
 */
static int ipu_enable_channel(enum ipu_channel channel)
{
        uint32_t reg;

        /* Reset to buffer 0 */
        reg_write(1UL << channel, IPU_CHA_CUR_BUF);

        switch (channel) {
        case IDMAC_SDC_0:
                ipu_channel_set_priority(channel, 1);
                break;
        default:
                break;
        }

        reg = reg_read(IDMAC_CHA_EN);
        reg_write(reg | (1UL << channel), IDMAC_CHA_EN);

        return 0;
}

static int ipu_update_channel_buffer(enum ipu_channel channel, void *buf)
{
        uint32_t reg;

        reg = reg_read(IPU_CHA_BUF0_RDY);
        if (reg & (1UL << channel))
                return -EACCES;

        /* 44.3.3.1.9 - Row Number 1 (WORD1, offset 0) */
        reg_write(dma_param_addr(channel) + 0x0008UL, IPU_IMA_ADDR);
        reg_write((u32)buf, IPU_IMA_DATA);

        return 0;
}

static int idmac_tx_submit(enum ipu_channel channel, void *buf)
{
        int ret;

        ipu_init_channel_buffer(channel, buf);


        /* ipu_idmac.c::ipu_submit_channel_buffers() */
        ret = ipu_update_channel_buffer(channel, buf);
        if (ret < 0)
                return ret;

        /* ipu_idmac.c::ipu_select_buffer() */
        /* Mark buffer 0 as ready. */
        reg_write(1UL << channel, IPU_CHA_BUF0_RDY);


        ret = ipu_enable_channel(channel);
        return ret;
}

static void sdc_enable_channel(void *fbmem)
{
        int ret;
        u32 reg;

        ret = idmac_tx_submit(IDMAC_SDC_0, fbmem);

        /* mx3fb.c::sdc_fb_init() */
        if (ret >= 0) {
                reg = reg_read(SDC_COM_CONF);
                reg_write(reg | SDC_COM_BG_EN, SDC_COM_CONF);
        }

        /*
         * Attention! Without this msleep the channel keeps generating
         * interrupts. Next sdc_set_brightness() is going to be called
         * from mx3fb_blank().
         */
        msleep(2);
}

/*
 * mx3fb_set_par() - set framebuffer parameters and change the operating mode.
 * @return:     0 on success or negative error code on failure.
 */
static int mx3fb_set_par(void)
{
        int ret;

        ret = sdc_init_panel(XRES, YRES, PIXEL_FMT);
        if (ret < 0)
                return ret;

        reg_write((H_START_WIDTH << 16) | V_START_WIDTH, SDC_BG_POS);

        return 0;
}

/* References in this function refer to respective Linux kernel sources */
void lcd_enable(void)
{
        u32 reg;

        /* pcm037.c::mxc_board_init() */

        /* Display Interface #3 */
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD0, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD1, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD2, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD3, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD4, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD5, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD6, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD7, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD8, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD9, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD10, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD11, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD12, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD13, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD14, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD15, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD16, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_LD17, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_VSYNC3, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_HSYNC, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_FPSHIFT, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_DRDY0, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_D3_REV, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_CONTRAST, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_D3_SPL, MUX_CTL_FUNC));
        mx31_gpio_mux(IOMUX_MODE_L(MX31_PIN_D3_CLS, MUX_CTL_FUNC));


        /* ipu_idmac.c::ipu_probe() */

        /* Start the clock */
        __REG(CCM_CGR1) = __REG(CCM_CGR1) | (3 << 22);


        /* ipu_idmac.c::ipu_idmac_init() */

        /* Service request counter to maximum - shouldn't be needed */
        reg_write(0x00000070, IDMAC_CONF);


        /* ipu_idmac.c::ipu_init_channel() */

        /* Enable IPU sub modules */
        reg = reg_read(IPU_CONF) | IPU_CONF_SDC_EN | IPU_CONF_DI_EN;
        reg_write(reg, IPU_CONF);


        /* mx3fb.c::init_fb_chan() */

        /* set Display Interface clock period */
        reg_write(0x00100010L, DI_HSP_CLK_PER);
        /* Might need to trigger HSP clock change - see 44.3.3.8.5 */


        /* mx3fb.c::sdc_set_brightness() */

        /* This might be board-specific */
        reg_write(0x03000000UL | 255 << 16, SDC_PWM_CTRL);


        /* mx3fb.c::sdc_set_global_alpha() */

        /* Use global - not per-pixel - Alpha-blending */
        reg = reg_read(SDC_GW_CTRL) & 0x00FFFFFFL;
        reg_write(reg | ((uint32_t) 0xff << 24), SDC_GW_CTRL);

        reg = reg_read(SDC_COM_CONF);
        reg_write(reg | SDC_COM_GLB_A, SDC_COM_CONF);


        /* mx3fb.c::sdc_set_color_key() */

        /* Disable colour-keying for background */
        reg = reg_read(SDC_COM_CONF) &
                ~(SDC_COM_GWSEL | SDC_COM_KEY_COLOR_G);
        reg_write(reg, SDC_COM_CONF);


        mx3fb_set_par();

        sdc_enable_channel(lcd_base);

        /*
         * Linux driver calls sdc_set_brightness() here again,
         * once is enough for us
         */
}

void lcd_ctrl_init(void *lcdbase)
{
        u32 mem_len = XRES * YRES * BIT_PER_PIXEL / 8;
        /*
         * We rely on lcdbase being a physical address, i.e., either MMU off,
         * or 1-to-1 mapping. Might want to add some virt2phys here.
         */
        if (!lcdbase)
                return;

        memset(lcdbase, 0, mem_len);
}

ulong calc_fbsize(void)
{
        return ((panel_info.vl_col * panel_info.vl_row *
                NBITS(panel_info.vl_bpix)) / 8) + PAGE_SIZE;
}

int overwrite_console(void)
{
        /* Keep stdout / stderr on serial, our LCD is for splashscreen only */
        return 1;
}