// SPDX-License-Identifier: GPL-2.0
#include <linux/aperture.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/mm_types.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/console.h>

#include "sm750.h"
#include "sm750_accel.h"
#include "sm750_cursor.h"

/*
 * #ifdef __BIG_ENDIAN
 * ssize_t lynxfb_ops_write(struct fb_info *info, const char __user *buf,
 * size_t count, loff_t *ppos);
 * ssize_t lynxfb_ops_read(struct fb_info *info, char __user *buf,
 * size_t count, loff_t *ppos);
 * #endif
 */

/* common var for all device */
static int g_hwcursor = 1;
static int g_noaccel;
static int g_nomtrr;
static const char *g_fbmode[] = {NULL, NULL};
static const char *g_def_fbmode = "1024x768-32@60";
static char *g_settings;
static int g_dualview;
static char *g_option;

static const struct fb_videomode lynx750_ext[] = {
        /*      1024x600-60 VESA        [1.71:1] */
        {NULL,  60, 1024, 600, 20423, 144,  40, 18, 1, 104, 3,
         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
         FB_VMODE_NONINTERLACED},

        /*      1024x600-70 VESA */
        {NULL,  70, 1024, 600, 17211, 152,  48, 21, 1, 104, 3,
         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
         FB_VMODE_NONINTERLACED},

        /*      1024x600-75 VESA */
        {NULL,  75, 1024, 600, 15822, 160,  56, 23, 1, 104, 3,
         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
         FB_VMODE_NONINTERLACED},

        /*      1024x600-85 VESA */
        {NULL,  85, 1024, 600, 13730, 168,  56, 26, 1, 112, 3,
         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
         FB_VMODE_NONINTERLACED},

        /*      720x480 */
        {NULL, 60,  720,  480,  37427, 88,   16, 13, 1,   72,  3,
         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
         FB_VMODE_NONINTERLACED},

        /*      1280x720                [1.78:1]        */
        {NULL, 60,  1280,  720,  13426, 162, 86, 22, 1,  136, 3,
         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
         FB_VMODE_NONINTERLACED},

        /*      1280x768@60 */
        {NULL, 60, 1280, 768, 12579, 192, 64, 20, 3, 128, 7,
         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
         FB_VMODE_NONINTERLACED},

        /*      1360 x 768      [1.77083:1]     */
        {NULL,  60, 1360, 768, 11804, 208,  64, 23, 1, 144, 3,
         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
         FB_VMODE_NONINTERLACED},

        /*      1368 x 768      [1.78:1]        */
        {NULL, 60,  1368,  768,  11647, 216, 72, 23, 1,  144, 3,
         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
         FB_VMODE_NONINTERLACED},

        /*      1440 x 900              [16:10] */
        {NULL, 60, 1440, 900, 9392, 232, 80, 28, 1, 152, 3,
         FB_SYNC_VERT_HIGH_ACT,
         FB_VMODE_NONINTERLACED},

        /*      1440x960                [15:10] */
        {NULL, 60, 1440, 960, 8733, 240, 88, 30, 1, 152, 3,
         FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
         FB_VMODE_NONINTERLACED},

        /*      1920x1080       [16:9]  */
        {NULL, 60, 1920, 1080, 6734, 148, 88, 41, 1, 44, 3,
         FB_SYNC_VERT_HIGH_ACT,
         FB_VMODE_NONINTERLACED},
};

/* no hardware cursor supported under version 2.6.10, kernel bug */
static int lynxfb_ops_cursor(struct fb_info *info, struct fb_cursor *fbcursor)
{
        struct lynxfb_par *par;
        struct lynxfb_crtc *crtc;
        struct lynx_cursor *cursor;

        par = info->par;
        crtc = &par->crtc;
        cursor = &crtc->cursor;

        if (fbcursor->image.width > cursor->max_w ||
            fbcursor->image.height > cursor->max_h ||
            fbcursor->image.depth > 1) {
                return -ENXIO;
        }

        sm750_hw_cursor_disable(cursor);
        if (fbcursor->set & FB_CUR_SETSIZE)
                sm750_hw_cursor_set_size(cursor,
                                         fbcursor->image.width,
                                         fbcursor->image.height);

        if (fbcursor->set & FB_CUR_SETPOS)
                sm750_hw_cursor_set_pos(cursor,
                                        fbcursor->image.dx - info->var.xoffset,
                                        fbcursor->image.dy - info->var.yoffset);

        if (fbcursor->set & FB_CUR_SETCMAP) {
                /* get the 16bit color of kernel means */
                u16 fg, bg;

                fg = ((info->cmap.red[fbcursor->image.fg_color] & 0xf800)) |
                     ((info->cmap.green[fbcursor->image.fg_color] & 0xfc00) >> 5) |
                     ((info->cmap.blue[fbcursor->image.fg_color] & 0xf800) >> 11);

                bg = ((info->cmap.red[fbcursor->image.bg_color] & 0xf800)) |
                     ((info->cmap.green[fbcursor->image.bg_color] & 0xfc00) >> 5) |
                     ((info->cmap.blue[fbcursor->image.bg_color] & 0xf800) >> 11);

                sm750_hw_cursor_set_color(cursor, fg, bg);
        }

        if (fbcursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
                sm750_hw_cursor_set_data(cursor, fbcursor->rop, fbcursor->image.data,
                                         fbcursor->mask);
        }

        if (fbcursor->enable)
                sm750_hw_cursor_enable(cursor);

        return 0;
}

static void lynxfb_ops_fillrect(struct fb_info *info,
                                const struct fb_fillrect *region)
{
        struct lynxfb_par *par;
        struct sm750_dev *sm750_dev;
        unsigned int base, pitch, bpp, rop;
        u32 color;

        if (info->state != FBINFO_STATE_RUNNING)
                return;

        par = info->par;
        sm750_dev = par->dev;

        /*
         * each time 2d function begin to work,below three variable always need
         * be set, seems we can put them together in some place
         */
        base = par->crtc.o_screen;
        pitch = info->fix.line_length;
        bpp = info->var.bits_per_pixel >> 3;

        color = (bpp == 1) ? region->color :
                ((u32 *)info->pseudo_palette)[region->color];
        rop = (region->rop != ROP_COPY) ? HW_ROP2_XOR : HW_ROP2_COPY;

        /*
         * If not use spin_lock, system will die if user load driver
         * and immediately unload driver frequently (dual)
         * since they fb_count could change during the lifetime of
         * this lock, we are holding it for all cases.
         */
        spin_lock(&sm750_dev->slock);

        sm750_dev->accel.de_fillrect(&sm750_dev->accel,
                                     base, pitch, bpp,
                                     region->dx, region->dy,
                                     region->width, region->height,
                                     color, rop);
        spin_unlock(&sm750_dev->slock);
}

static void lynxfb_ops_copyarea(struct fb_info *info,
                                const struct fb_copyarea *region)
{
        struct lynxfb_par *par;
        struct sm750_dev *sm750_dev;
        unsigned int base, pitch, bpp;

        par = info->par;
        sm750_dev = par->dev;

        /*
         * each time 2d function begin to work,below three variable always need
         * be set, seems we can put them together in some place
         */
        base = par->crtc.o_screen;
        pitch = info->fix.line_length;
        bpp = info->var.bits_per_pixel >> 3;

        /*
         * If not use spin_lock, system will die if user load driver
         * and immediately unload driver frequently (dual)
         * since they fb_count could change during the lifetime of
         * this lock, we are holding it for all cases.
         */
        spin_lock(&sm750_dev->slock);

        sm750_dev->accel.de_copyarea(&sm750_dev->accel,
                                     base, pitch, region->sx, region->sy,
                                     base, pitch, bpp, region->dx, region->dy,
                                     region->width, region->height,
                                     HW_ROP2_COPY);
        spin_unlock(&sm750_dev->slock);
}

static void lynxfb_ops_imageblit(struct fb_info *info,
                                 const struct fb_image *image)
{
        unsigned int base, pitch, bpp;
        unsigned int fgcol, bgcol;
        struct lynxfb_par *par;
        struct sm750_dev *sm750_dev;

        par = info->par;
        sm750_dev = par->dev;
        /*
         * each time 2d function begin to work,below three variable always need
         * be set, seems we can put them together in some place
         */
        base = par->crtc.o_screen;
        pitch = info->fix.line_length;
        bpp = info->var.bits_per_pixel >> 3;

        /* TODO: Implement hardware acceleration for image->depth > 1 */
        if (image->depth != 1) {
                cfb_imageblit(info, image);
                return;
        }

        if (info->fix.visual == FB_VISUAL_TRUECOLOR ||
            info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
                fgcol = ((u32 *)info->pseudo_palette)[image->fg_color];
                bgcol = ((u32 *)info->pseudo_palette)[image->bg_color];
        } else {
                fgcol = image->fg_color;
                bgcol = image->bg_color;
        }

        /*
         * If not use spin_lock, system will die if user load driver
         * and immediately unload driver frequently (dual)
         * since they fb_count could change during the lifetime of
         * this lock, we are holding it for all cases.
         */
        spin_lock(&sm750_dev->slock);

        sm750_dev->accel.de_imageblit(&sm750_dev->accel,
                                      image->data, image->width >> 3, 0,
                                      base, pitch, bpp,
                                      image->dx, image->dy,
                                      image->width, image->height,
                                      fgcol, bgcol, HW_ROP2_COPY);
        spin_unlock(&sm750_dev->slock);
}

static int lynxfb_ops_pan_display(struct fb_var_screeninfo *var,
                                  struct fb_info *info)
{
        struct lynxfb_par *par;
        struct lynxfb_crtc *crtc;

        if (!info)
                return -EINVAL;

        par = info->par;
        crtc = &par->crtc;
        return hw_sm750_pan_display(crtc, var, info);
}

static inline void lynxfb_set_visual_mode(struct fb_info *info)
{
        switch (info->var.bits_per_pixel) {
        case 8:
                info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
                break;
        case 16:
        case 24:
        case 32:
                info->fix.visual = FB_VISUAL_TRUECOLOR;
                break;
        default:
                break;
        }
}

static inline int lynxfb_set_color_offsets(struct fb_info *info)
{
        lynxfb_set_visual_mode(info);

        switch (info->var.bits_per_pixel) {
        case 8:
                info->var.red.offset = 0;
                info->var.red.length = 8;
                info->var.green.offset = 0;
                info->var.green.length = 8;
                info->var.blue.offset = 0;
                info->var.blue.length = 8;
                info->var.transp.length = 0;
                info->var.transp.offset = 0;
                break;
        case 16:
                info->var.red.offset = 11;
                info->var.red.length = 5;
                info->var.green.offset = 5;
                info->var.green.length = 6;
                info->var.blue.offset = 0;
                info->var.blue.length = 5;
                info->var.transp.length = 0;
                info->var.transp.offset = 0;
                break;
        case 24:
        case 32:
                info->var.red.offset = 16;
                info->var.red.length = 8;
                info->var.green.offset = 8;
                info->var.green.length = 8;
                info->var.blue.offset = 0;
                info->var.blue.length = 8;
                break;
        default:
                return -EINVAL;
        }
        return 0;
}

static int lynxfb_ops_set_par(struct fb_info *info)
{
        struct lynxfb_par *par;
        struct lynxfb_crtc *crtc;
        struct lynxfb_output *output;
        struct fb_var_screeninfo *var;
        struct fb_fix_screeninfo *fix;
        int ret;
        unsigned int line_length;

        if (!info)
                return -EINVAL;

        ret = 0;
        par = info->par;
        crtc = &par->crtc;
        output = &par->output;
        var = &info->var;
        fix = &info->fix;

        /* fix structure is not so FIX ... */
        line_length = var->xres_virtual * var->bits_per_pixel / 8;
        line_length = ALIGN(line_length, crtc->line_pad);
        fix->line_length = line_length;
        pr_info("fix->line_length = %d\n", fix->line_length);

        /*
         * var->red,green,blue,transp are need to be set by driver
         * and these data should be set before setcolreg routine
         */

        ret = lynxfb_set_color_offsets(info);

        var->height = -1;
        var->width = -1;
        var->accel_flags = 0;/*FB_ACCELF_TEXT;*/

        if (ret) {
                pr_err("bpp %d not supported\n", var->bits_per_pixel);
                return ret;
        }
        ret = hw_sm750_crtc_set_mode(crtc, var, fix);
        if (!ret)
                ret = hw_sm750_output_set_mode(output, var, fix);
        return ret;
}

static inline unsigned int chan_to_field(unsigned int chan,
                                         struct fb_bitfield *bf)
{
        chan &= 0xffff;
        chan >>= 16 - bf->length;
        return chan << bf->offset;
}

static int __maybe_unused lynxfb_suspend(struct device *dev)
{
        struct fb_info *info;
        struct sm750_dev *sm750_dev;

        sm750_dev = dev_get_drvdata(dev);

        console_lock();
        info = sm750_dev->fbinfo[0];
        if (info)
                /* 1 means do suspend */
                fb_set_suspend(info, 1);
        info = sm750_dev->fbinfo[1];
        if (info)
                /* 1 means do suspend */
                fb_set_suspend(info, 1);

        console_unlock();
        return 0;
}

static int __maybe_unused lynxfb_resume(struct device *dev)
{
        struct pci_dev *pdev = to_pci_dev(dev);
        struct fb_info *info;
        struct sm750_dev *sm750_dev;

        struct lynxfb_par *par;
        struct lynxfb_crtc *crtc;
        struct lynx_cursor *cursor;

        sm750_dev = pci_get_drvdata(pdev);

        console_lock();

        hw_sm750_inithw(sm750_dev, pdev);

        info = sm750_dev->fbinfo[0];

        if (info) {
                par = info->par;
                crtc = &par->crtc;
                cursor = &crtc->cursor;
                memset_io(cursor->vstart, 0x0, cursor->size);
                memset_io(crtc->v_screen, 0x0, crtc->vidmem_size);
                lynxfb_ops_set_par(info);
                fb_set_suspend(info, 0);
        }

        info = sm750_dev->fbinfo[1];

        if (info) {
                par = info->par;
                crtc = &par->crtc;
                cursor = &crtc->cursor;
                memset_io(cursor->vstart, 0x0, cursor->size);
                memset_io(crtc->v_screen, 0x0, crtc->vidmem_size);
                lynxfb_ops_set_par(info);
                fb_set_suspend(info, 0);
        }

        pdev->dev.power.power_state.event = PM_EVENT_RESUME;

        console_unlock();
        return 0;
}

static int lynxfb_ops_check_var(struct fb_var_screeninfo *var,
                                struct fb_info *info)
{
        int ret;
        struct lynxfb_par *par;
        struct lynxfb_crtc *crtc;
        resource_size_t request;

        ret = 0;
        par = info->par;
        crtc = &par->crtc;

        pr_debug("check var:%dx%d-%d\n",
                 var->xres,
                 var->yres,
                 var->bits_per_pixel);

        ret = lynxfb_set_color_offsets(info);

        if (ret) {
                pr_err("bpp %d not supported\n", var->bits_per_pixel);
                return ret;
        }

        var->height = -1;
        var->width = -1;
        var->accel_flags = 0;/* FB_ACCELF_TEXT; */

        /* check if current fb's video memory big enough to hold the onscreen*/
        request = var->xres_virtual * (var->bits_per_pixel >> 3);
        /* defaulty crtc->channel go with par->index */

        request = ALIGN(request, crtc->line_pad);
        request = request * var->yres_virtual;
        if (crtc->vidmem_size < request) {
                pr_err("not enough video memory for mode\n");
                return -ENOMEM;
        }

        return hw_sm750_crtc_check_mode(crtc, var);
}

static int lynxfb_ops_setcolreg(unsigned int regno,
                                unsigned int red,
                                unsigned int green,
                                unsigned int blue,
                                unsigned int transp,
                                struct fb_info *info)
{
        struct lynxfb_par *par;
        struct lynxfb_crtc *crtc;
        struct fb_var_screeninfo *var;
        int ret;

        par = info->par;
        crtc = &par->crtc;
        var = &info->var;
        ret = 0;

        if (regno > 256) {
                pr_err("regno = %d\n", regno);
                return -EINVAL;
        }

        if (info->var.grayscale) {
                int lum = (red * 77 + green * 151 + blue * 28) >> 8;

                red = lum;
                green = lum;
                blue = lum;
        }

        if (var->bits_per_pixel == 8 &&
            info->fix.visual == FB_VISUAL_PSEUDOCOLOR) {
                red >>= 8;
                green >>= 8;
                blue >>= 8;
                ret = hw_sm750_set_col_reg(crtc, regno, red, green, blue);
                goto exit;
        }

        if (info->fix.visual == FB_VISUAL_TRUECOLOR && regno < 256) {
                u32 val;

                if (var->bits_per_pixel == 16 ||
                    var->bits_per_pixel == 32 ||
                    var->bits_per_pixel == 24) {
                        val = chan_to_field(red, &var->red);
                        val |= chan_to_field(green, &var->green);
                        val |= chan_to_field(blue, &var->blue);
                        par->pseudo_palette[regno] = val;
                        goto exit;
                }
        }

        ret = -EINVAL;

exit:
        return ret;
}

static int lynxfb_ops_blank(int blank, struct fb_info *info)
{
        struct sm750_dev *sm750_dev;
        struct lynxfb_par *par;
        struct lynxfb_output *output;

        pr_debug("blank = %d.\n", blank);
        par = info->par;
        output = &par->output;
        sm750_dev = par->dev;

        if (sm750_dev->revid == SM750LE_REVISION_ID)
                return hw_sm750le_set_blank(output, blank);
        else
                return hw_sm750_set_blank(output, blank);
}

static int sm750fb_set_drv(struct lynxfb_par *par)
{
        int ret;
        struct sm750_dev *sm750_dev;
        struct lynxfb_output *output;
        struct lynxfb_crtc *crtc;

        ret = 0;

        sm750_dev = par->dev;
        output = &par->output;
        crtc = &par->crtc;

        crtc->vidmem_size = sm750_dev->vidmem_size;
        if (sm750_dev->fb_count > 1)
                crtc->vidmem_size >>= 1;

        /* setup crtc and output member */
        sm750_dev->hw_cursor = g_hwcursor;

        crtc->line_pad = 16;
        crtc->xpanstep = 8;
        crtc->ypanstep = 1;
        crtc->ywrapstep = 0;

        /* chip specific phase */
        sm750_dev->accel.de_wait = (sm750_dev->revid == SM750LE_REVISION_ID) ?
                                    hw_sm750le_de_wait : hw_sm750_de_wait;
        switch (sm750_dev->dataflow) {
        case sm750_simul_pri:
                output->paths = sm750_pnc;
                crtc->channel = sm750_primary;
                crtc->o_screen = 0;
                crtc->v_screen = sm750_dev->pvMem;
                pr_info("use simul primary mode\n");
                break;
        case sm750_simul_sec:
                output->paths = sm750_pnc;
                crtc->channel = sm750_secondary;
                crtc->o_screen = 0;
                crtc->v_screen = sm750_dev->pvMem;
                break;
        case sm750_dual_normal:
                if (par->index == 0) {
                        output->paths = sm750_panel;
                        crtc->channel = sm750_primary;
                        crtc->o_screen = 0;
                        crtc->v_screen = sm750_dev->pvMem;
                } else {
                        output->paths = sm750_crt;
                        crtc->channel = sm750_secondary;
                        /* not consider of padding stuffs for o_screen,need fix */
                        crtc->o_screen = sm750_dev->vidmem_size >> 1;
                        crtc->v_screen = sm750_dev->pvMem + crtc->o_screen;
                }
                break;
        case sm750_dual_swap:
                if (par->index == 0) {
                        output->paths = sm750_panel;
                        crtc->channel = sm750_secondary;
                        crtc->o_screen = 0;
                        crtc->v_screen = sm750_dev->pvMem;
                } else {
                        output->paths = sm750_crt;
                        crtc->channel = sm750_primary;
                        /* not consider of padding stuffs for o_screen,
                         * need fix
                         */
                        crtc->o_screen = sm750_dev->vidmem_size >> 1;
                        crtc->v_screen = sm750_dev->pvMem + crtc->o_screen;
                }
                break;
        default:
                ret = -EINVAL;
        }

        return ret;
}

static const struct fb_ops lynxfb_ops = {
        .owner = THIS_MODULE,
        FB_DEFAULT_IOMEM_OPS,
        .fb_check_var =  lynxfb_ops_check_var,
        .fb_set_par = lynxfb_ops_set_par,
        .fb_setcolreg = lynxfb_ops_setcolreg,
        .fb_blank = lynxfb_ops_blank,
        .fb_pan_display = lynxfb_ops_pan_display,
};

static const struct fb_ops lynxfb_ops_with_cursor = {
        .owner = THIS_MODULE,
        FB_DEFAULT_IOMEM_OPS,
        .fb_check_var =  lynxfb_ops_check_var,
        .fb_set_par = lynxfb_ops_set_par,
        .fb_setcolreg = lynxfb_ops_setcolreg,
        .fb_blank = lynxfb_ops_blank,
        .fb_pan_display = lynxfb_ops_pan_display,
        .fb_cursor = lynxfb_ops_cursor,
};

static const struct fb_ops lynxfb_ops_accel = {
        .owner = THIS_MODULE,
        __FB_DEFAULT_IOMEM_OPS_RDWR,
        .fb_check_var =  lynxfb_ops_check_var,
        .fb_set_par = lynxfb_ops_set_par,
        .fb_setcolreg = lynxfb_ops_setcolreg,
        .fb_blank = lynxfb_ops_blank,
        .fb_pan_display = lynxfb_ops_pan_display,
        .fb_fillrect = lynxfb_ops_fillrect,
        .fb_copyarea = lynxfb_ops_copyarea,
        .fb_imageblit = lynxfb_ops_imageblit,
        __FB_DEFAULT_IOMEM_OPS_MMAP,
};

static const struct fb_ops lynxfb_ops_accel_with_cursor = {
        .owner = THIS_MODULE,
        __FB_DEFAULT_IOMEM_OPS_RDWR,
        .fb_check_var =  lynxfb_ops_check_var,
        .fb_set_par = lynxfb_ops_set_par,
        .fb_setcolreg = lynxfb_ops_setcolreg,
        .fb_blank = lynxfb_ops_blank,
        .fb_pan_display = lynxfb_ops_pan_display,
        .fb_fillrect = lynxfb_ops_fillrect,
        .fb_copyarea = lynxfb_ops_copyarea,
        .fb_imageblit = lynxfb_ops_imageblit,
        .fb_cursor = lynxfb_ops_cursor,
        __FB_DEFAULT_IOMEM_OPS_MMAP,
};

static int lynxfb_set_fbinfo(struct fb_info *info, int index)
{
        int i;
        struct lynxfb_par *par;
        struct sm750_dev *sm750_dev;
        struct lynxfb_crtc *crtc;
        struct lynxfb_output *output;
        struct fb_var_screeninfo *var;
        struct fb_fix_screeninfo *fix;

        const struct fb_videomode *pdb[] = {
                lynx750_ext, NULL, vesa_modes,
        };
        int cdb[] = {ARRAY_SIZE(lynx750_ext), 0, VESA_MODEDB_SIZE};
        static const char * const mdb_desc[] = {
                "driver prepared modes",
                "kernel prepared default modedb",
                "kernel HELPERS prepared vesa_modes",
        };

        static const char *fix_id[2] = {
                "sm750_fb1", "sm750_fb2",
        };

        int ret, line_length;

        ret = 0;
        par = (struct lynxfb_par *)info->par;
        sm750_dev = par->dev;
        crtc = &par->crtc;
        output = &par->output;
        var = &info->var;
        fix = &info->fix;

        /* set index */
        par->index = index;
        output->channel = &crtc->channel;
        sm750fb_set_drv(par);

        /*
         * set current cursor variable and proc pointer,
         * must be set after crtc member initialized
         */
        crtc->cursor.offset = crtc->o_screen + crtc->vidmem_size - 1024;
        crtc->cursor.mmio = sm750_dev->pvReg +
                0x800f0 + (int)crtc->channel * 0x140;

        pr_info("crtc->cursor.mmio = %p\n", crtc->cursor.mmio);
        crtc->cursor.max_h = 64;
        crtc->cursor.max_w = 64;
        crtc->cursor.size = crtc->cursor.max_h * crtc->cursor.max_w * 2 / 8;
        crtc->cursor.vstart = sm750_dev->pvMem + crtc->cursor.offset;

        memset_io(crtc->cursor.vstart, 0, crtc->cursor.size);
        if (!g_hwcursor)
                sm750_hw_cursor_disable(&crtc->cursor);

        /* set info->fbops, must be set before fb_find_mode */
        if (!sm750_dev->accel_off) {
                /* use 2d acceleration */
                if (!g_hwcursor)
                        info->fbops = &lynxfb_ops_accel;
                else
                        info->fbops = &lynxfb_ops_accel_with_cursor;
        } else {
                if (!g_hwcursor)
                        info->fbops = &lynxfb_ops;
                else
                        info->fbops = &lynxfb_ops_with_cursor;
        }

        if (!g_fbmode[index]) {
                g_fbmode[index] = g_def_fbmode;
                if (index)
                        g_fbmode[index] = g_fbmode[0];
        }

        for (i = 0; i < 3; i++) {
                ret = fb_find_mode(var, info, g_fbmode[index],
                                   pdb[i], cdb[i], NULL, 8);

                if (ret == 1) {
                        pr_info("success! use specified mode:%s in %s\n",
                                g_fbmode[index],
                                mdb_desc[i]);
                        break;
                } else if (ret == 2) {
                        pr_warn("use specified mode:%s in %s,with an ignored refresh rate\n",
                                g_fbmode[index],
                                mdb_desc[i]);
                        break;
                } else if (ret == 3) {
                        pr_warn("wanna use default mode\n");
                        /*break;*/
                } else if (ret == 4) {
                        pr_warn("fall back to any valid mode\n");
                } else {
                        pr_warn("ret = %d,fb_find_mode failed,with %s\n",
                                ret,
                                mdb_desc[i]);
                }
        }

        /* some member of info->var had been set by fb_find_mode */

        pr_info("Member of info->var is :\n"
                "xres=%d\n"
                "yres=%d\n"
                "xres_virtual=%d\n"
                "yres_virtual=%d\n"
                "xoffset=%d\n"
                "yoffset=%d\n"
                "bits_per_pixel=%d\n"
                " ...\n",
                var->xres,
                var->yres,
                var->xres_virtual,
                var->yres_virtual,
                var->xoffset,
                var->yoffset,
                var->bits_per_pixel);

        /* set par */
        par->info = info;

        /* set info */
        line_length = ALIGN((var->xres_virtual * var->bits_per_pixel / 8),
                            crtc->line_pad);

        info->pseudo_palette = &par->pseudo_palette[0];
        info->screen_base = crtc->v_screen;
        pr_debug("screen_base vaddr = %p\n", info->screen_base);
        info->screen_size = line_length * var->yres_virtual;

        /* set info->fix */
        fix->type = FB_TYPE_PACKED_PIXELS;
        fix->type_aux = 0;
        fix->xpanstep = crtc->xpanstep;
        fix->ypanstep = crtc->ypanstep;
        fix->ywrapstep = crtc->ywrapstep;
        fix->accel = FB_ACCEL_SMI;

        strscpy(fix->id, fix_id[index], sizeof(fix->id));

        fix->smem_start = crtc->o_screen + sm750_dev->vidmem_start;
        pr_info("fix->smem_start = %lx\n", fix->smem_start);
        /*
         * according to mmap experiment from user space application,
         * fix->mmio_len should not larger than virtual size
         * (xres_virtual x yres_virtual x ByPP)
         * Below line maybe buggy when user mmap fb dev node and write
         * data into the bound over virtual size
         */
        fix->smem_len = crtc->vidmem_size;
        pr_info("fix->smem_len = %x\n", fix->smem_len);
        info->screen_size = fix->smem_len;
        fix->line_length = line_length;
        fix->mmio_start = sm750_dev->vidreg_start;
        pr_info("fix->mmio_start = %lx\n", fix->mmio_start);
        fix->mmio_len = sm750_dev->vidreg_size;
        pr_info("fix->mmio_len = %x\n", fix->mmio_len);

        lynxfb_set_visual_mode(info);

        /* set var */
        var->activate = FB_ACTIVATE_NOW;
        var->accel_flags = 0;
        var->vmode = FB_VMODE_NONINTERLACED;

        pr_debug("#1 show info->cmap :\nstart=%d,len=%d,red=%p,green=%p,blue=%p,transp=%p\n",
                 info->cmap.start, info->cmap.len,
                 info->cmap.red, info->cmap.green, info->cmap.blue,
                 info->cmap.transp);

        ret = fb_alloc_cmap(&info->cmap, 256, 0);
        if (ret < 0) {
                pr_err("Could not allocate memory for cmap.\n");
                goto exit;
        }

        pr_debug("#2 show info->cmap :\nstart=%d,len=%d,red=%p,green=%p,blue=%p,transp=%p\n",
                 info->cmap.start, info->cmap.len,
                 info->cmap.red, info->cmap.green, info->cmap.blue,
                 info->cmap.transp);

exit:
        lynxfb_ops_check_var(var, info);
        return ret;
}

/*      chip specific g_option configuration routine */
static void sm750fb_setup(struct sm750_dev *sm750_dev, char *src)
{
        char *opt;
        int swap;

        swap = 0;

        sm750_dev->init_parm.chip_clk = 0;
        sm750_dev->init_parm.mem_clk = 0;
        sm750_dev->init_parm.master_clk = 0;
        sm750_dev->init_parm.powerMode = 0;
        sm750_dev->init_parm.setAllEngOff = 0;
        sm750_dev->init_parm.resetMemory = 1;

        /* defaultly turn g_hwcursor on for both view */
        g_hwcursor = 3;

        if (!src || !*src) {
                dev_warn(&sm750_dev->pdev->dev, "no specific g_option.\n");
                goto NO_PARAM;
        }

        while ((opt = strsep(&src, ":")) != NULL && *opt != 0) {
                dev_info(&sm750_dev->pdev->dev, "opt=%s\n", opt);
                dev_info(&sm750_dev->pdev->dev, "src=%s\n", src);

                if (!strncmp(opt, "swap", strlen("swap"))) {
                        swap = 1;
                } else if (!strncmp(opt, "nocrt", strlen("nocrt"))) {
                        sm750_dev->nocrt = 1;
                } else if (!strncmp(opt, "36bit", strlen("36bit"))) {
                        sm750_dev->pnltype = sm750_doubleTFT;
                } else if (!strncmp(opt, "18bit", strlen("18bit"))) {
                        sm750_dev->pnltype = sm750_dualTFT;
                } else if (!strncmp(opt, "24bit", strlen("24bit"))) {
                        sm750_dev->pnltype = sm750_24TFT;
                } else if (!strncmp(opt, "nohwc0", strlen("nohwc0"))) {
                        g_hwcursor &= ~0x1;
                } else if (!strncmp(opt, "nohwc1", strlen("nohwc1"))) {
                        g_hwcursor &= ~0x2;
                } else if (!strncmp(opt, "nohwc", strlen("nohwc"))) {
                        g_hwcursor = 0;
                } else {
                        if (!g_fbmode[0]) {
                                g_fbmode[0] = opt;
                                dev_info(&sm750_dev->pdev->dev,
                                         "find fbmode0 : %s\n", g_fbmode[0]);
                        } else if (!g_fbmode[1]) {
                                g_fbmode[1] = opt;
                                dev_info(&sm750_dev->pdev->dev,
                                         "find fbmode1 : %s\n", g_fbmode[1]);
                        } else {
                                dev_warn(&sm750_dev->pdev->dev, "How many view you wann set?\n");
                        }
                }
        }

NO_PARAM:
        if (sm750_dev->revid != SM750LE_REVISION_ID) {
                if (sm750_dev->fb_count > 1) {
                        if (swap)
                                sm750_dev->dataflow = sm750_dual_swap;
                        else
                                sm750_dev->dataflow = sm750_dual_normal;
                } else {
                        if (swap)
                                sm750_dev->dataflow = sm750_simul_sec;
                        else
                                sm750_dev->dataflow = sm750_simul_pri;
                }
        } else {
                /* SM750LE only have one crt channel */
                sm750_dev->dataflow = sm750_simul_sec;
                /* sm750le do not have complex attributes */
                sm750_dev->nocrt = 0;
        }
}

static void sm750fb_framebuffer_release(struct sm750_dev *sm750_dev)
{
        struct fb_info *fb_info;

        while (sm750_dev->fb_count) {
                fb_info = sm750_dev->fbinfo[sm750_dev->fb_count - 1];
                unregister_framebuffer(fb_info);
                framebuffer_release(fb_info);
                sm750_dev->fb_count--;
        }
}

static int sm750fb_framebuffer_alloc(struct sm750_dev *sm750_dev, int fbidx)
{
        struct fb_info *fb_info;
        struct lynxfb_par *par;
        int err;

        fb_info = framebuffer_alloc(sizeof(struct lynxfb_par),
                                    &sm750_dev->pdev->dev);
        if (!fb_info)
                return -ENOMEM;

        sm750_dev->fbinfo[fbidx] = fb_info;
        par = fb_info->par;
        par->dev = sm750_dev;

        err = lynxfb_set_fbinfo(fb_info, fbidx);
        if (err)
                goto release_fb;

        err = register_framebuffer(fb_info);
        if (err < 0)
                goto release_fb;

        sm750_dev->fb_count++;

        return 0;

release_fb:
        framebuffer_release(fb_info);
        return err;
}

static int lynxfb_pci_probe(struct pci_dev *pdev,
                            const struct pci_device_id *ent)
{
        struct sm750_dev *sm750_dev = NULL;
        int max_fb;
        int fbidx;
        int err;

        err = aperture_remove_conflicting_pci_devices(pdev, "sm750_fb1");
        if (err)
                return err;

        /* enable device */
        err = pcim_enable_device(pdev);
        if (err)
                return err;

        err = -ENOMEM;
        sm750_dev = devm_kzalloc(&pdev->dev, sizeof(*sm750_dev), GFP_KERNEL);
        if (!sm750_dev)
                return err;

        sm750_dev->fbinfo[0] = NULL;
        sm750_dev->fbinfo[1] = NULL;
        sm750_dev->devid = pdev->device;
        sm750_dev->revid = pdev->revision;
        sm750_dev->pdev = pdev;
        sm750_dev->mtrr_off = g_nomtrr;
        sm750_dev->mtrr.vram = 0;
        sm750_dev->accel_off = g_noaccel;
        spin_lock_init(&sm750_dev->slock);

        if (!sm750_dev->accel_off) {
                /*
                 * hook deInit and 2d routines, notes that below hw_xxx
                 * routine can work on most of lynx chips
                 * if some chip need specific function,
                 * please hook it in smXXX_set_drv routine
                 */
                sm750_dev->accel.de_init = sm750_hw_de_init;
                sm750_dev->accel.de_fillrect = sm750_hw_fillrect;
                sm750_dev->accel.de_copyarea = sm750_hw_copyarea;
                sm750_dev->accel.de_imageblit = sm750_hw_imageblit;
        }

        /* call chip specific setup routine  */
        sm750fb_setup(sm750_dev, g_settings);

        /* call chip specific mmap routine */
        err = hw_sm750_map(sm750_dev, pdev);
        if (err)
                return err;

        if (!sm750_dev->mtrr_off)
                sm750_dev->mtrr.vram = arch_phys_wc_add(sm750_dev->vidmem_start,
                                                        sm750_dev->vidmem_size);

        memset_io(sm750_dev->pvMem, 0, sm750_dev->vidmem_size);

        pci_set_drvdata(pdev, sm750_dev);

        /* call chipInit routine */
        hw_sm750_inithw(sm750_dev, pdev);

        /* allocate frame buffer info structures according to g_dualview */
        max_fb = g_dualview ? 2 : 1;
        for (fbidx = 0; fbidx < max_fb; fbidx++) {
                err = sm750fb_framebuffer_alloc(sm750_dev, fbidx);
                if (err)
                        goto release_fb;
        }

        return 0;

release_fb:
        sm750fb_framebuffer_release(sm750_dev);
        return err;
}

static void lynxfb_pci_remove(struct pci_dev *pdev)
{
        struct sm750_dev *sm750_dev;

        sm750_dev = pci_get_drvdata(pdev);

        sm750fb_framebuffer_release(sm750_dev);
        arch_phys_wc_del(sm750_dev->mtrr.vram);

        iounmap(sm750_dev->pvReg);
        iounmap(sm750_dev->pvMem);
        pci_release_region(pdev, 1);
        kfree(g_settings);
}

static int __init lynxfb_setup(char *options)
{
        int len;
        char *opt, *tmp;

        if (!options || !*options) {
                pr_warn("no options.\n");
                return 0;
        }

        pr_info("options:%s\n", options);

        len = strlen(options) + 1;
        g_settings = kzalloc(len, GFP_KERNEL);
        if (!g_settings)
                return -ENOMEM;

        tmp = g_settings;

        /*
         * Notes:
         * char * strsep(char **s,const char * ct);
         * @s: the string to be searched
         * @ct :the characters to search for
         *
         * strsep() updates @options to pointer after the first found token
         * it also returns the pointer ahead the token.
         */
        while ((opt = strsep(&options, ":")) != NULL) {
                /* options that mean for any lynx chips are configured here */
                if (!strncmp(opt, "noaccel", strlen("noaccel"))) {
                        g_noaccel = 1;
                } else if (!strncmp(opt, "nomtrr", strlen("nomtrr"))) {
                        g_nomtrr = 1;
                } else if (!strncmp(opt, "dual", strlen("dual"))) {
                        g_dualview = 1;
                } else {
                        strcat(tmp, opt);
                        tmp += strlen(opt);
                        if (options)
                                *tmp++ = ':';
                        else
                                *tmp++ = 0;
                }
        }

        /* misc g_settings are transport to chip specific routines */
        pr_info("parameter left for chip specific analysis:%s\n", g_settings);
        return 0;
}

static const struct pci_device_id smi_pci_table[] = {
        { PCI_DEVICE(0x126f, 0x0750), },
        {0,}
};

MODULE_DEVICE_TABLE(pci, smi_pci_table);

static SIMPLE_DEV_PM_OPS(lynxfb_pm_ops, lynxfb_suspend, lynxfb_resume);

static struct pci_driver lynxfb_driver = {
        .name =         "sm750fb",
        .id_table =     smi_pci_table,
        .probe =        lynxfb_pci_probe,
        .remove =       lynxfb_pci_remove,
        .driver.pm =    &lynxfb_pm_ops,
};

static int __init lynxfb_init(void)
{
        char *option;

        if (fb_modesetting_disabled("sm750fb"))
                return -ENODEV;

#ifdef MODULE
        option = g_option;
#else
        if (fb_get_options("sm750fb", &option))
                return -ENODEV;
#endif

        lynxfb_setup(option);
        return pci_register_driver(&lynxfb_driver);
}
module_init(lynxfb_init);

static void __exit lynxfb_exit(void)
{
        pci_unregister_driver(&lynxfb_driver);
}
module_exit(lynxfb_exit);

module_param(g_option, charp, 0444);

MODULE_PARM_DESC(g_option,
                 "\n\t\tCommon options:\n"
                 "\t\tnoaccel:disable 2d capabilities\n"
                 "\t\tnomtrr:disable MTRR attribute for video memory\n"
                 "\t\tdualview:dual frame buffer feature enabled\n"
                 "\t\tnohwc:disable hardware cursor\n"
                 "\t\tUsual example:\n"
                 "\t\tinsmod ./sm750fb.ko g_option=\"noaccel,nohwc,1280x1024-8@60\"\n"
                 );

MODULE_AUTHOR("monk liu <monk.liu@siliconmotion.com>");
MODULE_AUTHOR("Sudip Mukherjee <sudip@vectorindia.org>");
MODULE_DESCRIPTION("Frame buffer driver for SM750 chipset");
MODULE_LICENSE("Dual BSD/GPL");