gx1fb_core.c

Go to the documentation of this file.

/*
 * drivers/video/geode/gx1fb_core.c
 *   -- Geode GX1 framebuffer driver
 *
 * Copyright (C) 2005 Arcom Control Systems Ltd.
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/pci.h>

#include "geodefb.h"
#include "display_gx1.h"
#include "video_cs5530.h"

static char mode_option[32] = "640x480-16@60";
static int  crt_option = 1;
static char panel_option[32] = "";

/* Modes relevant to the GX1 (taken from modedb.c) */
static const struct fb_videomode __devinitconst gx1_modedb[] = {
    /* 640x480-60 VESA */
    { NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
      0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 640x480-75 VESA */
    { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
      0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 640x480-85 VESA */
    { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
      0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 800x600-60 VESA */
    { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
      FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
      FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 800x600-75 VESA */
    { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
      FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
      FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 800x600-85 VESA */
    { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
      FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
      FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 1024x768-60 VESA */
    { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
      0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 1024x768-75 VESA */
    { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
      FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
      FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 1024x768-85 VESA */
    { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
      FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
      FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 1280x960-60 VESA */
    { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
      FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
      FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 1280x960-85 VESA */
    { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
      FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
      FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 1280x1024-60 VESA */
    { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
      FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
      FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 1280x1024-75 VESA */
    { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
      FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
      FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 1280x1024-85 VESA */
    { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
      FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
      FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
};

static int gx1_line_delta(int xres, int bpp)
{
    int line_delta = xres * (bpp >> 3);

    if (line_delta > 2048)
        line_delta = 4096;
    else if (line_delta > 1024)
        line_delta = 2048;
    else
        line_delta = 1024;
    return line_delta;
}

static int gx1fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
    struct geodefb_par *par = info->par;

    /* Maximum resolution is 1280x1024. */
    if (var->xres > 1280 || var->yres > 1024)
        return -EINVAL;

    if (par->panel_x && (var->xres > par->panel_x || var->yres > par->panel_y))
        return -EINVAL;

    /* Only 16 bpp and 8 bpp is supported by the hardware. */
    if (var->bits_per_pixel == 16) {
        var->red.offset   = 11; var->red.length   = 5;
        var->green.offset =  5; var->green.length = 6;
        var->blue.offset  =  0; var->blue.length  = 5;
        var->transp.offset = 0; var->transp.length = 0;
    } else if (var->bits_per_pixel == 8) {
        var->red.offset   = 0; var->red.length   = 8;
        var->green.offset = 0; var->green.length = 8;
        var->blue.offset  = 0; var->blue.length  = 8;
        var->transp.offset = 0; var->transp.length = 0;
    } else
        return -EINVAL;

    /* Enough video memory? */
    if (gx1_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
        return -EINVAL;

    /* FIXME: Check timing parameters here? */

    return 0;
}

static int gx1fb_set_par(struct fb_info *info)
{
    struct geodefb_par *par = info->par;

    if (info->var.bits_per_pixel == 16)
        info->fix.visual = FB_VISUAL_TRUECOLOR;
    else
        info->fix.visual = FB_VISUAL_PSEUDOCOLOR;

    info->fix.line_length = gx1_line_delta(info->var.xres, info->var.bits_per_pixel);

    par->dc_ops->set_mode(info);

    return 0;
}

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

static int gx1fb_setcolreg(unsigned regno, unsigned red, unsigned green,
               unsigned blue, unsigned transp,
               struct fb_info *info)
{
    struct geodefb_par *par = info->par;

    if (info->var.grayscale) {
        /* grayscale = 0.30*R + 0.59*G + 0.11*B */
        red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
    }

    /* Truecolor has hardware independent palette */
    if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
        u32 *pal = info->pseudo_palette;
        u32 v;

        if (regno >= 16)
            return -EINVAL;

        v  = chan_to_field(red, &info->var.red);
        v |= chan_to_field(green, &info->var.green);
        v |= chan_to_field(blue, &info->var.blue);

        pal[regno] = v;
    } else {
        if (regno >= 256)
            return -EINVAL;

        par->dc_ops->set_palette_reg(info, regno, red, green, blue);
    }

    return 0;
}

static int gx1fb_blank(int blank_mode, struct fb_info *info)
{
    struct geodefb_par *par = info->par;

    return par->vid_ops->blank_display(info, blank_mode);
}

static int __devinit gx1fb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
{
    struct geodefb_par *par = info->par;
    unsigned gx_base;
    int fb_len;
    int ret;

    gx_base = gx1_gx_base();
    if (!gx_base)
        return -ENODEV;

    ret = pci_enable_device(dev);
    if (ret < 0)
        return ret;

    ret = pci_request_region(dev, 0, "gx1fb (video)");
    if (ret < 0)
        return ret;
    par->vid_regs = pci_ioremap_bar(dev, 0);
    if (!par->vid_regs)
        return -ENOMEM;

    if (!request_mem_region(gx_base + 0x8300, 0x100, "gx1fb (display controller)"))
        return -EBUSY;
    par->dc_regs = ioremap(gx_base + 0x8300, 0x100);
    if (!par->dc_regs)
        return -ENOMEM;

    if ((fb_len = gx1_frame_buffer_size()) < 0)
        return -ENOMEM;
    info->fix.smem_start = gx_base + 0x800000;
    info->fix.smem_len = fb_len;
    info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
    if (!info->screen_base)
        return -ENOMEM;

    dev_info(&dev->dev, "%d Kibyte of video memory at 0x%lx\n",
         info->fix.smem_len / 1024, info->fix.smem_start);

    return 0;
}

static int parse_panel_option(struct fb_info *info)
{
    struct geodefb_par *par = info->par;

    if (strcmp(panel_option, "") != 0) {
        int x, y;
        char *s;
        x = simple_strtol(panel_option, &s, 10);
        if (!x)
            return -EINVAL;
        y = simple_strtol(s + 1, NULL, 10);
        if (!y)
            return -EINVAL;
        par->panel_x = x;
        par->panel_y = y;
    }
    return 0;
}

static struct fb_ops gx1fb_ops = {
    .owner      = THIS_MODULE,
    .fb_check_var   = gx1fb_check_var,
    .fb_set_par = gx1fb_set_par,
    .fb_setcolreg   = gx1fb_setcolreg,
    .fb_blank       = gx1fb_blank,
    /* No HW acceleration for now. */
    .fb_fillrect    = cfb_fillrect,
    .fb_copyarea    = cfb_copyarea,
    .fb_imageblit   = cfb_imageblit,
};

static struct fb_info * __devinit gx1fb_init_fbinfo(struct device *dev)
{
    struct geodefb_par *par;
    struct fb_info *info;

    /* Alloc enough space for the pseudo palette. */
    info = framebuffer_alloc(sizeof(struct geodefb_par) + sizeof(u32) * 16, dev);
    if (!info)
        return NULL;

    par = info->par;

    strcpy(info->fix.id, "GX1");

    info->fix.type      = FB_TYPE_PACKED_PIXELS;
    info->fix.type_aux  = 0;
    info->fix.xpanstep  = 0;
    info->fix.ypanstep  = 0;
    info->fix.ywrapstep = 0;
    info->fix.accel     = FB_ACCEL_NONE;

    info->var.nonstd    = 0;
    info->var.activate  = FB_ACTIVATE_NOW;
    info->var.height    = -1;
    info->var.width = -1;
    info->var.accel_flags = 0;
    info->var.vmode = FB_VMODE_NONINTERLACED;

    info->fbops     = &gx1fb_ops;
    info->flags     = FBINFO_DEFAULT;
    info->node      = -1;

    info->pseudo_palette    = (void *)par + sizeof(struct geodefb_par);

    info->var.grayscale = 0;

    /* CRT and panel options */
    par->enable_crt = crt_option;
    if (parse_panel_option(info) < 0)
        printk(KERN_WARNING "gx1fb: invalid 'panel' option -- disabling flat panel\n");
    if (!par->panel_x)
        par->enable_crt = 1; /* fall back to CRT if no panel is specified */

    if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
        framebuffer_release(info);
        return NULL;
    }
    return info;
}

static int __devinit gx1fb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
    struct geodefb_par *par;
    struct fb_info *info;
    int ret;

    info = gx1fb_init_fbinfo(&pdev->dev);
    if (!info)
        return -ENOMEM;
    par = info->par;

    /* GX1 display controller and CS5530 video device */
    par->dc_ops  = &gx1_dc_ops;
    par->vid_ops = &cs5530_vid_ops;

    if ((ret = gx1fb_map_video_memory(info, pdev)) < 0) {
        dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
        goto err;
    }

    ret = fb_find_mode(&info->var, info, mode_option,
               gx1_modedb, ARRAY_SIZE(gx1_modedb), NULL, 16);
    if (ret == 0 || ret == 4) {
        dev_err(&pdev->dev, "could not find valid video mode\n");
        ret = -EINVAL;
        goto err;
    }

        /* Clear the frame buffer of garbage. */
        memset_io(info->screen_base, 0, info->fix.smem_len);

    gx1fb_check_var(&info->var, info);
    gx1fb_set_par(info);

    if (register_framebuffer(info) < 0) {
        ret = -EINVAL;
        goto err;
    }
    pci_set_drvdata(pdev, info);
    printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, info->fix.id);
    return 0;

  err:
    if (info->screen_base) {
        iounmap(info->screen_base);
        pci_release_region(pdev, 0);
    }
    if (par->vid_regs) {
        iounmap(par->vid_regs);
        pci_release_region(pdev, 1);
    }
    if (par->dc_regs) {
        iounmap(par->dc_regs);
        release_mem_region(gx1_gx_base() + 0x8300, 0x100);
    }

    if (info) {
        fb_dealloc_cmap(&info->cmap);
        framebuffer_release(info);
    }

    return ret;
}

static void __devexit gx1fb_remove(struct pci_dev *pdev)
{
    struct fb_info *info = pci_get_drvdata(pdev);
    struct geodefb_par *par = info->par;

    unregister_framebuffer(info);

    iounmap((void __iomem *)info->screen_base);
    pci_release_region(pdev, 0);

    iounmap(par->vid_regs);
    pci_release_region(pdev, 1);

    iounmap(par->dc_regs);
    release_mem_region(gx1_gx_base() + 0x8300, 0x100);

    fb_dealloc_cmap(&info->cmap);
    pci_set_drvdata(pdev, NULL);

    framebuffer_release(info);
}

#ifndef MODULE
static void __init gx1fb_setup(char *options)
{
    char *this_opt;

    if (!options || !*options)
        return;

    while ((this_opt = strsep(&options, ","))) {
        if (!*this_opt)
            continue;

        if (!strncmp(this_opt, "mode:", 5))
            strlcpy(mode_option, this_opt + 5, sizeof(mode_option));
        else if (!strncmp(this_opt, "crt:", 4))
            crt_option = !!simple_strtoul(this_opt + 4, NULL, 0);
        else if (!strncmp(this_opt, "panel:", 6))
            strlcpy(panel_option, this_opt + 6, sizeof(panel_option));
        else
            strlcpy(mode_option, this_opt, sizeof(mode_option));
    }
}
#endif

static struct pci_device_id gx1fb_id_table[] = {
    { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_VIDEO,
      PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY << 16,
      0xff0000, 0 },
    { 0, }
};

MODULE_DEVICE_TABLE(pci, gx1fb_id_table);

static struct pci_driver gx1fb_driver = {
    .name       = "gx1fb",
    .id_table   = gx1fb_id_table,
    .probe      = gx1fb_probe,
    .remove     = __devexit_p(gx1fb_remove),
};

static int __init gx1fb_init(void)
{
#ifndef MODULE
    char *option = NULL;

    if (fb_get_options("gx1fb", &option))
        return -ENODEV;
    gx1fb_setup(option);
#endif
    return pci_register_driver(&gx1fb_driver);
}

static void __devexit gx1fb_cleanup(void)
{
    pci_unregister_driver(&gx1fb_driver);
}

module_init(gx1fb_init);
module_exit(gx1fb_cleanup);

module_param_string(mode, mode_option, sizeof(mode_option), 0444);
MODULE_PARM_DESC(mode, "video mode (<x>x<y>[-<bpp>][@<refr>])");

module_param_named(crt, crt_option, int, 0444);
MODULE_PARM_DESC(crt, "enable CRT output. 0 = off, 1 = on (default)");

module_param_string(panel, panel_option, sizeof(panel_option), 0444);
MODULE_PARM_DESC(panel, "size of attached flat panel (<x>x<y>)");

MODULE_DESCRIPTION("framebuffer driver for the AMD Geode GX1");
MODULE_LICENSE("GPL");