/*
 * Porting to u-boot:
 *
 * (C) Copyright 2010
 * Stefano Babic, DENX Software Engineering, sbabic@denx.de
 *
 * MX51 Linux framebuffer:
 *
 * (C) Copyright 2004-2010 Freescale Semiconductor, Inc.
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

#include <common.h>
#include <linux/errno.h>
#include <asm/global_data.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/fb.h>
#include <asm/io.h>
#include <malloc.h>
#include <video_fb.h>
#include "videomodes.h"
#include "ipu.h"
#include "mxcfb.h"
#include "ipu_regs.h"

DECLARE_GLOBAL_DATA_PTR;

static int mxcfb_map_video_memory(struct fb_info *fbi);
static int mxcfb_unmap_video_memory(struct fb_info *fbi);

/* graphics setup */
static GraphicDevice panel;
static struct fb_videomode const *gmode;
static uint8_t gdisp;
static uint32_t gpixfmt;

static void fb_videomode_to_var(struct fb_var_screeninfo *var,
                         const struct fb_videomode *mode)
{
        var->xres = mode->xres;
        var->yres = mode->yres;
        var->xres_virtual = mode->xres;
        var->yres_virtual = mode->yres;
        var->xoffset = 0;
        var->yoffset = 0;
        var->pixclock = mode->pixclock;
        var->left_margin = mode->left_margin;
        var->right_margin = mode->right_margin;
        var->upper_margin = mode->upper_margin;
        var->lower_margin = mode->lower_margin;
        var->hsync_len = mode->hsync_len;
        var->vsync_len = mode->vsync_len;
        var->sync = mode->sync;
        var->vmode = mode->vmode & FB_VMODE_MASK;
}

/*
 * Structure containing the MXC specific framebuffer information.
 */
struct mxcfb_info {
        int blank;
        ipu_channel_t ipu_ch;
        int ipu_di;
        u32 ipu_di_pix_fmt;
        unsigned char overlay;
        unsigned char alpha_chan_en;
        dma_addr_t alpha_phy_addr0;
        dma_addr_t alpha_phy_addr1;
        void *alpha_virt_addr0;
        void *alpha_virt_addr1;
        uint32_t alpha_mem_len;
        uint32_t cur_ipu_buf;
        uint32_t cur_ipu_alpha_buf;

        u32 pseudo_palette[16];
};

enum {
        BOTH_ON,
        SRC_ON,
        TGT_ON,
        BOTH_OFF
};

static unsigned long default_bpp = 16;
static unsigned char g_dp_in_use;
static struct fb_info *mxcfb_info[3];
static int ext_clk_used;

static uint32_t bpp_to_pixfmt(struct fb_info *fbi)
{
        uint32_t pixfmt = 0;

        debug("bpp_to_pixfmt: %d\n", fbi->var.bits_per_pixel);

        if (fbi->var.nonstd)
                return fbi->var.nonstd;

        switch (fbi->var.bits_per_pixel) {
        case 24:
                pixfmt = IPU_PIX_FMT_BGR24;
                break;
        case 32:
                pixfmt = IPU_PIX_FMT_BGR32;
                break;
        case 16:
                pixfmt = IPU_PIX_FMT_RGB565;
                break;
        }
        return pixfmt;
}

/*
 * Set fixed framebuffer parameters based on variable settings.
 *
 * @param       info     framebuffer information pointer
 */
static int mxcfb_set_fix(struct fb_info *info)
{
        struct fb_fix_screeninfo *fix = &info->fix;
        struct fb_var_screeninfo *var = &info->var;

        fix->line_length = var->xres_virtual * var->bits_per_pixel / 8;

        fix->type = FB_TYPE_PACKED_PIXELS;
        fix->accel = FB_ACCEL_NONE;
        fix->visual = FB_VISUAL_TRUECOLOR;
        fix->xpanstep = 1;
        fix->ypanstep = 1;

        return 0;
}

static int setup_disp_channel1(struct fb_info *fbi)
{
        ipu_channel_params_t params;
        struct mxcfb_info *mxc_fbi = (struct mxcfb_info *)fbi->par;

        memset(&params, 0, sizeof(params));
        params.mem_dp_bg_sync.di = mxc_fbi->ipu_di;

        debug("%s called\n", __func__);
        /*
         * Assuming interlaced means yuv output, below setting also
         * valid for mem_dc_sync. FG should have the same vmode as BG.
         */
        if (fbi->var.vmode & FB_VMODE_INTERLACED) {
                params.mem_dp_bg_sync.interlaced = 1;
                params.mem_dp_bg_sync.out_pixel_fmt =
                        IPU_PIX_FMT_YUV444;
        } else {
                if (mxc_fbi->ipu_di_pix_fmt) {
                        params.mem_dp_bg_sync.out_pixel_fmt =
                                mxc_fbi->ipu_di_pix_fmt;
                } else {
                        params.mem_dp_bg_sync.out_pixel_fmt =
                                IPU_PIX_FMT_RGB666;
                }
        }
        params.mem_dp_bg_sync.in_pixel_fmt = bpp_to_pixfmt(fbi);
        if (mxc_fbi->alpha_chan_en)
                params.mem_dp_bg_sync.alpha_chan_en = 1;

        ipu_init_channel(mxc_fbi->ipu_ch, &params);

        return 0;
}

static int setup_disp_channel2(struct fb_info *fbi)
{
        int retval = 0;
        struct mxcfb_info *mxc_fbi = (struct mxcfb_info *)fbi->par;

        mxc_fbi->cur_ipu_buf = 1;
        if (mxc_fbi->alpha_chan_en)
                mxc_fbi->cur_ipu_alpha_buf = 1;

        fbi->var.xoffset = fbi->var.yoffset = 0;

        debug("%s: %x %d %d %d %lx %lx\n",
                __func__,
                mxc_fbi->ipu_ch,
                fbi->var.xres,
                fbi->var.yres,
                fbi->fix.line_length,
                fbi->fix.smem_start,
                fbi->fix.smem_start +
                (fbi->fix.line_length * fbi->var.yres));

        retval = ipu_init_channel_buffer(mxc_fbi->ipu_ch, IPU_INPUT_BUFFER,
                                         bpp_to_pixfmt(fbi),
                                         fbi->var.xres, fbi->var.yres,
                                         fbi->fix.line_length,
                                         fbi->fix.smem_start +
                                         (fbi->fix.line_length * fbi->var.yres),
                                         fbi->fix.smem_start,
                                         0, 0);
        if (retval)
                printf("ipu_init_channel_buffer error %d\n", retval);

        return retval;
}

/*
 * Set framebuffer parameters and change the operating mode.
 *
 * @param       info     framebuffer information pointer
 */
static int mxcfb_set_par(struct fb_info *fbi)
{
        int retval = 0;
        u32 mem_len;
        ipu_di_signal_cfg_t sig_cfg;
        struct mxcfb_info *mxc_fbi = (struct mxcfb_info *)fbi->par;
        uint32_t out_pixel_fmt;

        ipu_disable_channel(mxc_fbi->ipu_ch);
        ipu_uninit_channel(mxc_fbi->ipu_ch);
        mxcfb_set_fix(fbi);

        mem_len = fbi->var.yres_virtual * fbi->fix.line_length;
        if (!fbi->fix.smem_start || (mem_len > fbi->fix.smem_len)) {
                if (fbi->fix.smem_start)
                        mxcfb_unmap_video_memory(fbi);

                if (mxcfb_map_video_memory(fbi) < 0)
                        return -ENOMEM;
        }

        setup_disp_channel1(fbi);

        memset(&sig_cfg, 0, sizeof(sig_cfg));
        if (fbi->var.vmode & FB_VMODE_INTERLACED) {
                sig_cfg.interlaced = 1;
                out_pixel_fmt = IPU_PIX_FMT_YUV444;
        } else {
                if (mxc_fbi->ipu_di_pix_fmt)
                        out_pixel_fmt = mxc_fbi->ipu_di_pix_fmt;
                else
                        out_pixel_fmt = IPU_PIX_FMT_RGB666;
        }
        if (fbi->var.vmode & FB_VMODE_ODD_FLD_FIRST) /* PAL */
                sig_cfg.odd_field_first = 1;
        if ((fbi->var.sync & FB_SYNC_EXT) || ext_clk_used)
                sig_cfg.ext_clk = 1;
        if (fbi->var.sync & FB_SYNC_HOR_HIGH_ACT)
                sig_cfg.Hsync_pol = 1;
        if (fbi->var.sync & FB_SYNC_VERT_HIGH_ACT)
                sig_cfg.Vsync_pol = 1;
        if (!(fbi->var.sync & FB_SYNC_CLK_LAT_FALL))
                sig_cfg.clk_pol = 1;
        if (fbi->var.sync & FB_SYNC_DATA_INVERT)
                sig_cfg.data_pol = 1;
        if (!(fbi->var.sync & FB_SYNC_OE_LOW_ACT))
                sig_cfg.enable_pol = 1;
        if (fbi->var.sync & FB_SYNC_CLK_IDLE_EN)
                sig_cfg.clkidle_en = 1;

        debug("pixclock = %lu Hz\n", PICOS2KHZ(fbi->var.pixclock) * 1000UL);

        if (ipu_init_sync_panel(mxc_fbi->ipu_di,
                                (PICOS2KHZ(fbi->var.pixclock)) * 1000UL,
                                fbi->var.xres, fbi->var.yres,
                                out_pixel_fmt,
                                fbi->var.left_margin,
                                fbi->var.hsync_len,
                                fbi->var.right_margin,
                                fbi->var.upper_margin,
                                fbi->var.vsync_len,
                                fbi->var.lower_margin,
                                0, sig_cfg) != 0) {
                puts("mxcfb: Error initializing panel.\n");
                return -EINVAL;
        }

        retval = setup_disp_channel2(fbi);
        if (retval)
                return retval;

        if (mxc_fbi->blank == FB_BLANK_UNBLANK)
                ipu_enable_channel(mxc_fbi->ipu_ch);

        return retval;
}

/*
 * Check framebuffer variable parameters and adjust to valid values.
 *
 * @param       var      framebuffer variable parameters
 *
 * @param       info     framebuffer information pointer
 */
static int mxcfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
        u32 vtotal;
        u32 htotal;

        if (var->xres_virtual < var->xres)
                var->xres_virtual = var->xres;
        if (var->yres_virtual < var->yres)
                var->yres_virtual = var->yres;

        if ((var->bits_per_pixel != 32) && (var->bits_per_pixel != 24) &&
            (var->bits_per_pixel != 16) && (var->bits_per_pixel != 8))
                var->bits_per_pixel = default_bpp;

        switch (var->bits_per_pixel) {
        case 8:
                var->red.length = 3;
                var->red.offset = 5;
                var->red.msb_right = 0;

                var->green.length = 3;
                var->green.offset = 2;
                var->green.msb_right = 0;

                var->blue.length = 2;
                var->blue.offset = 0;
                var->blue.msb_right = 0;

                var->transp.length = 0;
                var->transp.offset = 0;
                var->transp.msb_right = 0;
                break;
        case 16:
                var->red.length = 5;
                var->red.offset = 11;
                var->red.msb_right = 0;

                var->green.length = 6;
                var->green.offset = 5;
                var->green.msb_right = 0;

                var->blue.length = 5;
                var->blue.offset = 0;
                var->blue.msb_right = 0;

                var->transp.length = 0;
                var->transp.offset = 0;
                var->transp.msb_right = 0;
                break;
        case 24:
                var->red.length = 8;
                var->red.offset = 16;
                var->red.msb_right = 0;

                var->green.length = 8;
                var->green.offset = 8;
                var->green.msb_right = 0;

                var->blue.length = 8;
                var->blue.offset = 0;
                var->blue.msb_right = 0;

                var->transp.length = 0;
                var->transp.offset = 0;
                var->transp.msb_right = 0;
                break;
        case 32:
                var->red.length = 8;
                var->red.offset = 16;
                var->red.msb_right = 0;

                var->green.length = 8;
                var->green.offset = 8;
                var->green.msb_right = 0;

                var->blue.length = 8;
                var->blue.offset = 0;
                var->blue.msb_right = 0;

                var->transp.length = 8;
                var->transp.offset = 24;
                var->transp.msb_right = 0;
                break;
        }

        if (var->pixclock < 1000) {
                htotal = var->xres + var->right_margin + var->hsync_len +
                    var->left_margin;
                vtotal = var->yres + var->lower_margin + var->vsync_len +
                    var->upper_margin;
                var->pixclock = (vtotal * htotal * 6UL) / 100UL;
                var->pixclock = KHZ2PICOS(var->pixclock);
                printf("pixclock set for 60Hz refresh = %u ps\n",
                        var->pixclock);
        }

        var->height = -1;
        var->width = -1;
        var->grayscale = 0;

        return 0;
}

static int mxcfb_map_video_memory(struct fb_info *fbi)
{
        if (fbi->fix.smem_len < fbi->var.yres_virtual * fbi->fix.line_length) {
                fbi->fix.smem_len = fbi->var.yres_virtual *
                                    fbi->fix.line_length;
        }
        fbi->fix.smem_len = roundup(fbi->fix.smem_len, ARCH_DMA_MINALIGN);
        fbi->screen_base = (char *)memalign(ARCH_DMA_MINALIGN,
                                            fbi->fix.smem_len);
        fbi->fix.smem_start = (unsigned long)fbi->screen_base;
        if (fbi->screen_base == 0) {
                puts("Unable to allocate framebuffer memory\n");
                fbi->fix.smem_len = 0;
                fbi->fix.smem_start = 0;
                return -EBUSY;
        }

        debug("allocated fb @ paddr=0x%08X, size=%d.\n",
                (uint32_t) fbi->fix.smem_start, fbi->fix.smem_len);

        fbi->screen_size = fbi->fix.smem_len;

        gd->fb_base = fbi->fix.smem_start;

        /* Clear the screen */
        memset((char *)fbi->screen_base, 0, fbi->fix.smem_len);

        return 0;
}

static int mxcfb_unmap_video_memory(struct fb_info *fbi)
{
        fbi->screen_base = 0;
        fbi->fix.smem_start = 0;
        fbi->fix.smem_len = 0;
        return 0;
}

/*
 * Initializes the framebuffer information pointer. After allocating
 * sufficient memory for the framebuffer structure, the fields are
 * filled with custom information passed in from the configurable
 * structures.  This includes information such as bits per pixel,
 * color maps, screen width/height and RGBA offsets.
 *
 * @return      Framebuffer structure initialized with our information
 */
static struct fb_info *mxcfb_init_fbinfo(void)
{
#define BYTES_PER_LONG 4
#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))
        struct fb_info *fbi;
        struct mxcfb_info *mxcfbi;
        char *p;
        int size = sizeof(struct mxcfb_info) + PADDING +
                sizeof(struct fb_info);

        debug("%s: %d %d %d %d\n",
                __func__,
                PADDING,
                size,
                sizeof(struct mxcfb_info),
                sizeof(struct fb_info));
        /*
         * Allocate sufficient memory for the fb structure
         */

        p = malloc(size);
        if (!p)
                return NULL;

        memset(p, 0, size);

        fbi = (struct fb_info *)p;
        fbi->par = p + sizeof(struct fb_info) + PADDING;

        mxcfbi = (struct mxcfb_info *)fbi->par;
        debug("Framebuffer structures at: fbi=0x%x mxcfbi=0x%x\n",
                (unsigned int)fbi, (unsigned int)mxcfbi);

        fbi->var.activate = FB_ACTIVATE_NOW;

        fbi->flags = FBINFO_FLAG_DEFAULT;
        fbi->pseudo_palette = mxcfbi->pseudo_palette;

        return fbi;
}

/*
 * Probe routine for the framebuffer driver. It is called during the
 * driver binding process. The following functions are performed in
 * this routine: Framebuffer initialization, Memory allocation and
 * mapping, Framebuffer registration, IPU initialization.
 *
 * @return      Appropriate error code to the kernel common code
 */
static int mxcfb_probe(u32 interface_pix_fmt, uint8_t disp,
                        struct fb_videomode const *mode)
{
        struct fb_info *fbi;
        struct mxcfb_info *mxcfbi;
        int ret = 0;

        /*
         * Initialize FB structures
         */
        fbi = mxcfb_init_fbinfo();
        if (!fbi) {
                ret = -ENOMEM;
                goto err0;
        }
        mxcfbi = (struct mxcfb_info *)fbi->par;

        if (!g_dp_in_use) {
                mxcfbi->ipu_ch = MEM_BG_SYNC;
                mxcfbi->blank = FB_BLANK_UNBLANK;
        } else {
                mxcfbi->ipu_ch = MEM_DC_SYNC;
                mxcfbi->blank = FB_BLANK_POWERDOWN;
        }

        mxcfbi->ipu_di = disp;

        ipu_disp_set_global_alpha(mxcfbi->ipu_ch, 1, 0x80);
        ipu_disp_set_color_key(mxcfbi->ipu_ch, 0, 0);
        strcpy(fbi->fix.id, "DISP3 BG");

        g_dp_in_use = 1;

        mxcfb_info[mxcfbi->ipu_di] = fbi;

        /* Need dummy values until real panel is configured */

        mxcfbi->ipu_di_pix_fmt = interface_pix_fmt;
        fb_videomode_to_var(&fbi->var, mode);
        fbi->var.bits_per_pixel = 16;
        fbi->fix.line_length = fbi->var.xres * (fbi->var.bits_per_pixel / 8);
        fbi->fix.smem_len = fbi->var.yres_virtual * fbi->fix.line_length;

        mxcfb_check_var(&fbi->var, fbi);

        /* Default Y virtual size is 2x panel size */
        fbi->var.yres_virtual = fbi->var.yres * 2;

        mxcfb_set_fix(fbi);

        /* allocate fb first */
        if (mxcfb_map_video_memory(fbi) < 0)
                return -ENOMEM;

        mxcfb_set_par(fbi);

        panel.winSizeX = mode->xres;
        panel.winSizeY = mode->yres;
        panel.plnSizeX = mode->xres;
        panel.plnSizeY = mode->yres;

        panel.frameAdrs = (u32)fbi->screen_base;
        panel.memSize = fbi->screen_size;

        panel.gdfBytesPP = 2;
        panel.gdfIndex = GDF_16BIT_565RGB;

        ipu_dump_registers();

        return 0;

err0:
        return ret;
}

void ipuv3_fb_shutdown(void)
{
        int i;
        struct ipu_stat *stat = (struct ipu_stat *)IPU_STAT;

        for (i = 0; i < ARRAY_SIZE(mxcfb_info); i++) {
                struct fb_info *fbi = mxcfb_info[i];
                if (fbi) {
                        struct mxcfb_info *mxc_fbi = fbi->par;
                        ipu_disable_channel(mxc_fbi->ipu_ch);
                        ipu_uninit_channel(mxc_fbi->ipu_ch);
                }
        }
        for (i = 0; i < ARRAY_SIZE(stat->int_stat); i++) {
                __raw_writel(__raw_readl(&stat->int_stat[i]),
                             &stat->int_stat[i]);
        }
}

void *video_hw_init(void)
{
        int ret;

        ret = ipu_probe();
        if (ret)
                puts("Error initializing IPU\n");

        ret = mxcfb_probe(gpixfmt, gdisp, gmode);
        debug("Framebuffer at 0x%x\n", (unsigned int)panel.frameAdrs);

        return (void *)&panel;
}

int ipuv3_fb_init(struct fb_videomode const *mode,
                  uint8_t disp,
                  uint32_t pixfmt)
{
        gmode = mode;
        gdisp = disp;
        gpixfmt = pixfmt;

        return 0;
}