pvr2fb.c

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/*
 * drivers/video/pvr2fb.c
 *
 * Frame buffer and fbcon support for the NEC PowerVR2 found within the Sega
 * Dreamcast.
 *
 * Copyright (c) 2001 M. R. Brown <[email protected]>
 * Copyright (c) 2001 - 2008  Paul Mundt <[email protected]>
 *
 * This driver is mostly based on the excellent amifb and vfb sources.  It uses
 * an odd scheme for converting hardware values to/from framebuffer values,
 * here are some hacked-up formulas:
 *
 *  The Dreamcast has screen offsets from each side of its four borders and
 *  the start offsets of the display window.  I used these values to calculate
 *  'pseudo' values (think of them as placeholders) for the fb video mode, so
 *  that when it came time to convert these values back into their hardware
 *  values, I could just add mode- specific offsets to get the correct mode
 *  settings:
 *
 *      left_margin = diwstart_h - borderstart_h;
 *      right_margin = borderstop_h - (diwstart_h + xres);
 *      upper_margin = diwstart_v - borderstart_v;
 *      lower_margin = borderstop_v - (diwstart_h + yres);
 *
 *      hsync_len = borderstart_h + (hsync_total - borderstop_h);
 *      vsync_len = borderstart_v + (vsync_total - borderstop_v);
 *
 *  Then, when it's time to convert back to hardware settings, the only
 *  constants are the borderstart_* offsets, all other values are derived from
 *  the fb video mode:
 *
 *      // PAL
 *      borderstart_h = 116;
 *      borderstart_v = 44;
 *      ...
 *      borderstop_h = borderstart_h + hsync_total - hsync_len;
 *      ...
 *      diwstart_v = borderstart_v - upper_margin;
 *
 *  However, in the current implementation, the borderstart values haven't had
 *  the benefit of being fully researched, so some modes may be broken.
 */

#undef DEBUG

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

#ifdef CONFIG_SH_DREAMCAST
#include <asm/machvec.h>
#include <mach-dreamcast/mach/sysasic.h>
#endif

#ifdef CONFIG_PVR2_DMA
#include <linux/pagemap.h>
#include <mach/dma.h>
#include <asm/dma.h>
#endif

#ifdef CONFIG_SH_STORE_QUEUES
#include <linux/uaccess.h>
#include <cpu/sq.h>
#endif

#ifndef PCI_DEVICE_ID_NEC_NEON250
#  define PCI_DEVICE_ID_NEC_NEON250 0x0067
#endif

/* 2D video registers */
#define DISP_BASE   par->mmio_base
#define DISP_BRDRCOLR (DISP_BASE + 0x40)
#define DISP_DIWMODE (DISP_BASE + 0x44)
#define DISP_DIWADDRL (DISP_BASE + 0x50)
#define DISP_DIWADDRS (DISP_BASE + 0x54)
#define DISP_DIWSIZE (DISP_BASE + 0x5c)
#define DISP_SYNCCONF (DISP_BASE + 0xd0)
#define DISP_BRDRHORZ (DISP_BASE + 0xd4)
#define DISP_SYNCSIZE (DISP_BASE + 0xd8)
#define DISP_BRDRVERT (DISP_BASE + 0xdc)
#define DISP_DIWCONF (DISP_BASE + 0xe8)
#define DISP_DIWHSTRT (DISP_BASE + 0xec)
#define DISP_DIWVSTRT (DISP_BASE + 0xf0)
#define DISP_PIXDEPTH (DISP_BASE + 0x108)

/* Pixel clocks, one for TV output, doubled for VGA output */
#define TV_CLK 74239
#define VGA_CLK 37119

/* This is for 60Hz - the VTOTAL is doubled for interlaced modes */
#define PAL_HTOTAL 863
#define PAL_VTOTAL 312
#define NTSC_HTOTAL 857
#define NTSC_VTOTAL 262

/* Supported cable types */
enum { CT_VGA, CT_NONE, CT_RGB, CT_COMPOSITE };

/* Supported video output types */
enum { VO_PAL, VO_NTSC, VO_VGA };

/* Supported palette types */
enum { PAL_ARGB1555, PAL_RGB565, PAL_ARGB4444, PAL_ARGB8888 };

struct pvr2_params { unsigned int val; char *name; };
static struct pvr2_params cables[] __devinitdata = {
    { CT_VGA, "VGA" }, { CT_RGB, "RGB" }, { CT_COMPOSITE, "COMPOSITE" },
};

static struct pvr2_params outputs[] __devinitdata = {
    { VO_PAL, "PAL" }, { VO_NTSC, "NTSC" }, { VO_VGA, "VGA" },
};

/*
 * This describes the current video mode
 */

static struct pvr2fb_par {
    unsigned int hsync_total;   /* Clocks/line */
    unsigned int vsync_total;   /* Lines/field */
    unsigned int borderstart_h;
    unsigned int borderstop_h;
    unsigned int borderstart_v;
    unsigned int borderstop_v;
    unsigned int diwstart_h;    /* Horizontal offset of the display field */
    unsigned int diwstart_v;    /* Vertical offset of the display field, for
                   interlaced modes, this is the long field */
    unsigned long disp_start;   /* Address of image within VRAM */
    unsigned char is_interlaced;    /* Is the display interlaced? */
    unsigned char is_doublescan;    /* Are scanlines output twice? (doublescan) */
    unsigned char is_lowres;    /* Is horizontal pixel-doubling enabled? */

    unsigned long mmio_base;    /* MMIO base */
    u32 palette[16];
} *currentpar;

static struct fb_info *fb_info;

static struct fb_fix_screeninfo pvr2_fix __devinitdata = {
    .id =       "NEC PowerVR2",
    .type =     FB_TYPE_PACKED_PIXELS,
    .visual =   FB_VISUAL_TRUECOLOR,
    .ypanstep = 1,
    .ywrapstep =    1,
    .accel =    FB_ACCEL_NONE,
};

static struct fb_var_screeninfo pvr2_var __devinitdata = {
    .xres =     640,
    .yres =     480,
    .xres_virtual = 640,
    .yres_virtual = 480,
    .bits_per_pixel =16,
    .red =      { 11, 5, 0 },
    .green =    {  5, 6, 0 },
    .blue =     {  0, 5, 0 },
    .activate = FB_ACTIVATE_NOW,
    .height =   -1,
    .width =    -1,
    .vmode =    FB_VMODE_NONINTERLACED,
};

static int cable_type = CT_VGA;
static int video_output = VO_VGA;

static int nopan = 0;
static int nowrap = 1;

/*
 * We do all updating, blanking, etc. during the vertical retrace period
 */
static unsigned int do_vmode_full = 0;  /* Change the video mode */
static unsigned int do_vmode_pan = 0;   /* Update the video mode */
static short do_blank = 0;      /* (Un)Blank the screen */

static unsigned int is_blanked = 0;     /* Is the screen blanked? */

#ifdef CONFIG_SH_STORE_QUEUES
static unsigned long pvr2fb_map;
#endif

#ifdef CONFIG_PVR2_DMA
static unsigned int shdma = PVR2_CASCADE_CHAN;
static unsigned int pvr2dma = ONCHIP_NR_DMA_CHANNELS;
#endif

static int pvr2fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green, unsigned int blue,
                            unsigned int transp, struct fb_info *info);
static int pvr2fb_blank(int blank, struct fb_info *info);
static unsigned long get_line_length(int xres_virtual, int bpp);
static void set_color_bitfields(struct fb_var_screeninfo *var);
static int pvr2fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info);
static int pvr2fb_set_par(struct fb_info *info);
static void pvr2_update_display(struct fb_info *info);
static void pvr2_init_display(struct fb_info *info);
static void pvr2_do_blank(void);
static irqreturn_t pvr2fb_interrupt(int irq, void *dev_id);
static int pvr2_init_cable(void);
static int pvr2_get_param(const struct pvr2_params *p, const char *s,
                            int val, int size);
#ifdef CONFIG_PVR2_DMA
static ssize_t pvr2fb_write(struct fb_info *info, const char *buf,
                size_t count, loff_t *ppos);
#endif

static struct fb_ops pvr2fb_ops = {
    .owner      = THIS_MODULE,
    .fb_setcolreg   = pvr2fb_setcolreg,
    .fb_blank   = pvr2fb_blank,
    .fb_check_var   = pvr2fb_check_var,
    .fb_set_par = pvr2fb_set_par,
#ifdef CONFIG_PVR2_DMA
    .fb_write   = pvr2fb_write,
#endif
    .fb_fillrect    = cfb_fillrect,
    .fb_copyarea    = cfb_copyarea,
    .fb_imageblit   = cfb_imageblit,
};

static struct fb_videomode pvr2_modedb[] __devinitdata = {
    /*
     * Broadcast video modes (PAL and NTSC).  I'm unfamiliar with
     * PAL-M and PAL-N, but from what I've read both modes parallel PAL and
     * NTSC, so it shouldn't be a problem (I hope).
     */

    {
    /* 640x480 @ 60Hz interlaced (NTSC) */
    "ntsc_640x480i", 60, 640, 480, TV_CLK, 38, 33, 0, 18, 146, 26,
    FB_SYNC_BROADCAST, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
    }, {
    /* 640x240 @ 60Hz (NTSC) */
    /* XXX: Broken! Don't use... */
    "ntsc_640x240", 60, 640, 240, TV_CLK, 38, 33, 0, 0, 146, 22,
    FB_SYNC_BROADCAST, FB_VMODE_YWRAP
    }, {
    /* 640x480 @ 60hz (VGA) */
    "vga_640x480", 60, 640, 480, VGA_CLK, 38, 33, 0, 18, 146, 26,
    0, FB_VMODE_YWRAP
    },
};

#define NUM_TOTAL_MODES  ARRAY_SIZE(pvr2_modedb)

#define DEFMODE_NTSC    0
#define DEFMODE_PAL 0
#define DEFMODE_VGA 2

static int defmode = DEFMODE_NTSC;
static char *mode_option __devinitdata = NULL;

static inline void pvr2fb_set_pal_type(unsigned int type)
{
    struct pvr2fb_par *par = (struct pvr2fb_par *)fb_info->par;

    fb_writel(type, par->mmio_base + 0x108);
}

static inline void pvr2fb_set_pal_entry(struct pvr2fb_par *par,
                    unsigned int regno,
                    unsigned int val)
{
    fb_writel(val, par->mmio_base + 0x1000 + (4 * regno));
}

static int pvr2fb_blank(int blank, struct fb_info *info)
{
    do_blank = blank ? blank : -1;
    return 0;
}

static inline unsigned long get_line_length(int xres_virtual, int bpp)
{
    return (unsigned long)((((xres_virtual*bpp)+31)&~31) >> 3);
}

static void set_color_bitfields(struct fb_var_screeninfo *var)
{
    switch (var->bits_per_pixel) {
        case 16:        /* RGB 565 */
        pvr2fb_set_pal_type(PAL_RGB565);
        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;
        break;
        case 24:        /* RGB 888 */
        var->red.offset = 16;    var->red.length = 8;
        var->green.offset = 8;   var->green.length = 8;
        var->blue.offset = 0;    var->blue.length = 8;
        var->transp.offset = 0;  var->transp.length = 0;
        break;
        case 32:        /* ARGB 8888 */
        pvr2fb_set_pal_type(PAL_ARGB8888);
        var->red.offset = 16;    var->red.length = 8;
        var->green.offset = 8;   var->green.length = 8;
        var->blue.offset = 0;    var->blue.length = 8;
        var->transp.offset = 24; var->transp.length = 8;
        break;
    }
}

static int pvr2fb_setcolreg(unsigned int regno, unsigned int red,
                unsigned int green, unsigned int blue,
                            unsigned int transp, struct fb_info *info)
{
    struct pvr2fb_par *par = (struct pvr2fb_par *)info->par;
    unsigned int tmp;

    if (regno > info->cmap.len)
        return 1;

    /*
     * We only support the hardware palette for 16 and 32bpp. It's also
     * expected that the palette format has been set by the time we get
     * here, so we don't waste time setting it again.
     */
    switch (info->var.bits_per_pixel) {
        case 16: /* RGB 565 */
        tmp =  (red   & 0xf800)       |
              ((green & 0xfc00) >> 5) |
              ((blue  & 0xf800) >> 11);

        pvr2fb_set_pal_entry(par, regno, tmp);
        break;
        case 24: /* RGB 888 */
        red >>= 8; green >>= 8; blue >>= 8;
        tmp = (red << 16) | (green << 8) | blue;
        break;
        case 32: /* ARGB 8888 */
        red >>= 8; green >>= 8; blue >>= 8;
        tmp = (transp << 24) | (red << 16) | (green << 8) | blue;

        pvr2fb_set_pal_entry(par, regno, tmp);
        break;
        default:
        pr_debug("Invalid bit depth %d?!?\n", info->var.bits_per_pixel);
        return 1;
    }

    if (regno < 16)
        ((u32*)(info->pseudo_palette))[regno] = tmp;

    return 0;
}

static int pvr2fb_set_par(struct fb_info *info)
{
    struct pvr2fb_par *par = (struct pvr2fb_par *)info->par;
    struct fb_var_screeninfo *var = &info->var;
    unsigned long line_length;
    unsigned int vtotal;

    /*
     * XXX: It's possible that a user could use a VGA box, change the cable
     * type in hardware (i.e. switch from VGA<->composite), then change
     * modes (i.e. switching to another VT).  If that happens we should
     * automagically change the output format to cope, but currently I
     * don't have a VGA box to make sure this works properly.
     */
    cable_type = pvr2_init_cable();
    if (cable_type == CT_VGA && video_output != VO_VGA)
        video_output = VO_VGA;

    var->vmode &= FB_VMODE_MASK;
    if (var->vmode & FB_VMODE_INTERLACED && video_output != VO_VGA)
        par->is_interlaced = 1;
    /*
     * XXX: Need to be more creative with this (i.e. allow doublecan for
     * PAL/NTSC output).
     */
    if (var->vmode & FB_VMODE_DOUBLE && video_output == VO_VGA)
        par->is_doublescan = 1;

    par->hsync_total = var->left_margin + var->xres + var->right_margin +
                       var->hsync_len;
    par->vsync_total = var->upper_margin + var->yres + var->lower_margin +
                       var->vsync_len;

    if (var->sync & FB_SYNC_BROADCAST) {
        vtotal = par->vsync_total;
        if (par->is_interlaced)
            vtotal /= 2;
        if (vtotal > (PAL_VTOTAL + NTSC_VTOTAL)/2) {
            /* XXX: Check for start values here... */
            /* XXX: Check hardware for PAL-compatibility */
            par->borderstart_h = 116;
            par->borderstart_v = 44;
        } else {
            /* NTSC video output */
            par->borderstart_h = 126;
            par->borderstart_v = 18;
        }
    } else {
        /* VGA mode */
        /* XXX: What else needs to be checked? */
        /*
         * XXX: We have a little freedom in VGA modes, what ranges
         * should be here (i.e. hsync/vsync totals, etc.)?
         */
        par->borderstart_h = 126;
        par->borderstart_v = 40;
    }

    /* Calculate the remainding offsets */
    par->diwstart_h = par->borderstart_h + var->left_margin;
    par->diwstart_v = par->borderstart_v + var->upper_margin;
    par->borderstop_h = par->diwstart_h + var->xres +
                var->right_margin;
    par->borderstop_v = par->diwstart_v + var->yres +
                var->lower_margin;

    if (!par->is_interlaced)
        par->borderstop_v /= 2;
    if (info->var.xres < 640)
        par->is_lowres = 1;

    line_length = get_line_length(var->xres_virtual, var->bits_per_pixel);
    par->disp_start = info->fix.smem_start + (line_length * var->yoffset) * line_length;
    info->fix.line_length = line_length;
    return 0;
}

static int pvr2fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
    struct pvr2fb_par *par = (struct pvr2fb_par *)info->par;
    unsigned int vtotal, hsync_total;
    unsigned long line_length;

    if (var->pixclock != TV_CLK && var->pixclock != VGA_CLK) {
        pr_debug("Invalid pixclock value %d\n", var->pixclock);
        return -EINVAL;
    }

    if (var->xres < 320)
        var->xres = 320;
    if (var->yres < 240)
        var->yres = 240;
    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 <= 16)
        var->bits_per_pixel = 16;
    else if (var->bits_per_pixel <= 24)
        var->bits_per_pixel = 24;
    else if (var->bits_per_pixel <= 32)
        var->bits_per_pixel = 32;

    set_color_bitfields(var);

    if (var->vmode & FB_VMODE_YWRAP) {
        if (var->xoffset || var->yoffset < 0 ||
            var->yoffset >= var->yres_virtual) {
            var->xoffset = var->yoffset = 0;
        } else {
            if (var->xoffset > var->xres_virtual - var->xres ||
                var->yoffset > var->yres_virtual - var->yres ||
                var->xoffset < 0 || var->yoffset < 0)
                var->xoffset = var->yoffset = 0;
        }
    } else {
        var->xoffset = var->yoffset = 0;
    }

    /*
     * XXX: Need to be more creative with this (i.e. allow doublecan for
     * PAL/NTSC output).
     */
    if (var->yres < 480 && video_output == VO_VGA)
        var->vmode |= FB_VMODE_DOUBLE;

    if (video_output != VO_VGA) {
        var->sync |= FB_SYNC_BROADCAST;
        var->vmode |= FB_VMODE_INTERLACED;
    } else {
        var->sync &= ~FB_SYNC_BROADCAST;
        var->vmode &= ~FB_VMODE_INTERLACED;
        var->vmode |= FB_VMODE_NONINTERLACED;
    }

    if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_TEST) {
        var->right_margin = par->borderstop_h -
                   (par->diwstart_h + var->xres);
        var->left_margin  = par->diwstart_h - par->borderstart_h;
        var->hsync_len    = par->borderstart_h +
                           (par->hsync_total - par->borderstop_h);

        var->upper_margin = par->diwstart_v - par->borderstart_v;
        var->lower_margin = par->borderstop_v -
                   (par->diwstart_v + var->yres);
        var->vsync_len    = par->borderstop_v +
                   (par->vsync_total - par->borderstop_v);
    }

    hsync_total = var->left_margin + var->xres + var->right_margin +
              var->hsync_len;
    vtotal = var->upper_margin + var->yres + var->lower_margin +
         var->vsync_len;

    if (var->sync & FB_SYNC_BROADCAST) {
        if (var->vmode & FB_VMODE_INTERLACED)
            vtotal /= 2;
        if (vtotal > (PAL_VTOTAL + NTSC_VTOTAL)/2) {
            /* PAL video output */
            /* XXX: Should be using a range here ... ? */
            if (hsync_total != PAL_HTOTAL) {
                pr_debug("invalid hsync total for PAL\n");
                return -EINVAL;
            }
        } else {
            /* NTSC video output */
            if (hsync_total != NTSC_HTOTAL) {
                pr_debug("invalid hsync total for NTSC\n");
                return -EINVAL;
            }
        }
    }

    /* Check memory sizes */
    line_length = get_line_length(var->xres_virtual, var->bits_per_pixel);
    if (line_length * var->yres_virtual > info->fix.smem_len)
        return -ENOMEM;

    return 0;
}

static void pvr2_update_display(struct fb_info *info)
{
    struct pvr2fb_par *par = (struct pvr2fb_par *) info->par;
    struct fb_var_screeninfo *var = &info->var;

    /* Update the start address of the display image */
    fb_writel(par->disp_start, DISP_DIWADDRL);
    fb_writel(par->disp_start +
          get_line_length(var->xoffset+var->xres, var->bits_per_pixel),
              DISP_DIWADDRS);
}

/*
 * Initialize the video mode.  Currently, the 16bpp and 24bpp modes aren't
 * very stable.  It's probably due to the fact that a lot of the 2D video
 * registers are still undocumented.
 */

static void pvr2_init_display(struct fb_info *info)
{
    struct pvr2fb_par *par = (struct pvr2fb_par *) info->par;
    struct fb_var_screeninfo *var = &info->var;
    unsigned int diw_height, diw_width, diw_modulo = 1;
    unsigned int bytesperpixel = var->bits_per_pixel >> 3;

    /* hsync and vsync totals */
    fb_writel((par->vsync_total << 16) | par->hsync_total, DISP_SYNCSIZE);

    /* column height, modulo, row width */
    /* since we're "panning" within vram, we need to offset things based
     * on the offset from the virtual x start to our real gfx. */
    if (video_output != VO_VGA && par->is_interlaced)
        diw_modulo += info->fix.line_length / 4;
    diw_height = (par->is_interlaced ? var->yres / 2 : var->yres);
    diw_width = get_line_length(var->xres, var->bits_per_pixel) / 4;
    fb_writel((diw_modulo << 20) | (--diw_height << 10) | --diw_width,
              DISP_DIWSIZE);

    /* display address, long and short fields */
    fb_writel(par->disp_start, DISP_DIWADDRL);
    fb_writel(par->disp_start +
              get_line_length(var->xoffset+var->xres, var->bits_per_pixel),
              DISP_DIWADDRS);

    /* border horizontal, border vertical, border color */
    fb_writel((par->borderstart_h << 16) | par->borderstop_h, DISP_BRDRHORZ);
    fb_writel((par->borderstart_v << 16) | par->borderstop_v, DISP_BRDRVERT);
    fb_writel(0, DISP_BRDRCOLR);

    /* display window start position */
    fb_writel(par->diwstart_h, DISP_DIWHSTRT);
    fb_writel((par->diwstart_v << 16) | par->diwstart_v, DISP_DIWVSTRT);

    /* misc. settings */
    fb_writel((0x16 << 16) | par->is_lowres, DISP_DIWCONF);

    /* clock doubler (for VGA), scan doubler, display enable */
    fb_writel(((video_output == VO_VGA) << 23) |
              (par->is_doublescan << 1) | 1, DISP_DIWMODE);

    /* bits per pixel */
    fb_writel(fb_readl(DISP_DIWMODE) | (--bytesperpixel << 2), DISP_DIWMODE);
    fb_writel(bytesperpixel << 2, DISP_PIXDEPTH);

    /* video enable, color sync, interlace,
     * hsync and vsync polarity (currently unused) */
    fb_writel(0x100 | ((par->is_interlaced /*|4*/) << 4), DISP_SYNCCONF);
}

/* Simulate blanking by making the border cover the entire screen */

#define BLANK_BIT (1<<3)

static void pvr2_do_blank(void)
{
    struct pvr2fb_par *par = currentpar;
    unsigned long diwconf;

    diwconf = fb_readl(DISP_DIWCONF);
    if (do_blank > 0)
        fb_writel(diwconf | BLANK_BIT, DISP_DIWCONF);
    else
        fb_writel(diwconf & ~BLANK_BIT, DISP_DIWCONF);

    is_blanked = do_blank > 0 ? do_blank : 0;
}

static irqreturn_t pvr2fb_interrupt(int irq, void *dev_id)
{
    struct fb_info *info = dev_id;

    if (do_vmode_pan || do_vmode_full)
        pvr2_update_display(info);
    if (do_vmode_full)
        pvr2_init_display(info);
    if (do_vmode_pan)
        do_vmode_pan = 0;
    if (do_vmode_full)
        do_vmode_full = 0;
    if (do_blank) {
        pvr2_do_blank();
        do_blank = 0;
    }
    return IRQ_HANDLED;
}

/*
 * Determine the cable type and initialize the cable output format.  Don't do
 * anything if the cable type has been overidden (via "cable:XX").
 */

#define PCTRA 0xff80002c
#define PDTRA 0xff800030
#define VOUTC 0xa0702c00

static int pvr2_init_cable(void)
{
    if (cable_type < 0) {
        fb_writel((fb_readl(PCTRA) & 0xfff0ffff) | 0x000a0000,
                      PCTRA);
        cable_type = (fb_readw(PDTRA) >> 8) & 3;
    }

    /* Now select the output format (either composite or other) */
    /* XXX: Save the previous val first, as this reg is also AICA
      related */
    if (cable_type == CT_COMPOSITE)
        fb_writel(3 << 8, VOUTC);
    else if (cable_type == CT_RGB)
        fb_writel(1 << 9, VOUTC);
    else
        fb_writel(0, VOUTC);

    return cable_type;
}

#ifdef CONFIG_PVR2_DMA
static ssize_t pvr2fb_write(struct fb_info *info, const char *buf,
                size_t count, loff_t *ppos)
{
    unsigned long dst, start, end, len;
    unsigned int nr_pages;
    struct page **pages;
    int ret, i;

    nr_pages = (count + PAGE_SIZE - 1) >> PAGE_SHIFT;

    pages = kmalloc(nr_pages * sizeof(struct page *), GFP_KERNEL);
    if (!pages)
        return -ENOMEM;

    down_read(&current->mm->mmap_sem);
    ret = get_user_pages(current, current->mm, (unsigned long)buf,
                 nr_pages, WRITE, 0, pages, NULL);
    up_read(&current->mm->mmap_sem);

    if (ret < nr_pages) {
        nr_pages = ret;
        ret = -EINVAL;
        goto out_unmap;
    }

    dma_configure_channel(shdma, 0x12c1);

    dst   = (unsigned long)fb_info->screen_base + *ppos;
    start = (unsigned long)page_address(pages[0]);
    end   = (unsigned long)page_address(pages[nr_pages]);
    len   = nr_pages << PAGE_SHIFT;

    /* Half-assed contig check */
    if (start + len == end) {
        /* As we do this in one shot, it's either all or nothing.. */
        if ((*ppos + len) > fb_info->fix.smem_len) {
            ret = -ENOSPC;
            goto out_unmap;
        }

        dma_write(shdma, start, 0, len);
        dma_write(pvr2dma, 0, dst, len);
        dma_wait_for_completion(pvr2dma);

        goto out;
    }

    /* Not contiguous, writeout per-page instead.. */
    for (i = 0; i < nr_pages; i++, dst += PAGE_SIZE) {
        if ((*ppos + (i << PAGE_SHIFT)) > fb_info->fix.smem_len) {
            ret = -ENOSPC;
            goto out_unmap;
        }

        dma_write_page(shdma, (unsigned long)page_address(pages[i]), 0);
        dma_write_page(pvr2dma, 0, dst);
        dma_wait_for_completion(pvr2dma);
    }

out:
    *ppos += count;
    ret = count;

out_unmap:
    for (i = 0; i < nr_pages; i++)
        page_cache_release(pages[i]);

    kfree(pages);

    return ret;
}
#endif /* CONFIG_PVR2_DMA */

static int __devinit pvr2fb_common_init(void)
{
    struct pvr2fb_par *par = currentpar;
    unsigned long modememused, rev;

    fb_info->screen_base = ioremap_nocache(pvr2_fix.smem_start,
                           pvr2_fix.smem_len);

    if (!fb_info->screen_base) {
        printk(KERN_ERR "pvr2fb: Failed to remap smem space\n");
        goto out_err;
    }

    par->mmio_base = (unsigned long)ioremap_nocache(pvr2_fix.mmio_start,
                            pvr2_fix.mmio_len);
    if (!par->mmio_base) {
        printk(KERN_ERR "pvr2fb: Failed to remap mmio space\n");
        goto out_err;
    }

    fb_memset(fb_info->screen_base, 0, pvr2_fix.smem_len);

    pvr2_fix.ypanstep   = nopan  ? 0 : 1;
    pvr2_fix.ywrapstep  = nowrap ? 0 : 1;

    fb_info->fbops      = &pvr2fb_ops;
    fb_info->fix        = pvr2_fix;
    fb_info->par        = currentpar;
    fb_info->pseudo_palette = currentpar->palette;
    fb_info->flags      = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;

    if (video_output == VO_VGA)
        defmode = DEFMODE_VGA;

    if (!mode_option)
        mode_option = "640x480@60";

    if (!fb_find_mode(&fb_info->var, fb_info, mode_option, pvr2_modedb,
                      NUM_TOTAL_MODES, &pvr2_modedb[defmode], 16))
        fb_info->var = pvr2_var;

    fb_alloc_cmap(&fb_info->cmap, 256, 0);

    if (register_framebuffer(fb_info) < 0)
        goto out_err;
    /*Must write PIXDEPTH to register before anything is displayed - so force init */
    pvr2_init_display(fb_info);

    modememused = get_line_length(fb_info->var.xres_virtual,
                      fb_info->var.bits_per_pixel);
    modememused *= fb_info->var.yres_virtual;

    rev = fb_readl(par->mmio_base + 0x04);

    printk("fb%d: %s (rev %ld.%ld) frame buffer device, using %ldk/%ldk of video memory\n",
           fb_info->node, fb_info->fix.id, (rev >> 4) & 0x0f, rev & 0x0f,
           modememused >> 10, (unsigned long)(fb_info->fix.smem_len >> 10));
    printk("fb%d: Mode %dx%d-%d pitch = %ld cable: %s video output: %s\n",
           fb_info->node, fb_info->var.xres, fb_info->var.yres,
           fb_info->var.bits_per_pixel,
           get_line_length(fb_info->var.xres, fb_info->var.bits_per_pixel),
           (char *)pvr2_get_param(cables, NULL, cable_type, 3),
           (char *)pvr2_get_param(outputs, NULL, video_output, 3));

#ifdef CONFIG_SH_STORE_QUEUES
    printk(KERN_NOTICE "fb%d: registering with SQ API\n", fb_info->node);

    pvr2fb_map = sq_remap(fb_info->fix.smem_start, fb_info->fix.smem_len,
                  fb_info->fix.id, PAGE_SHARED);

    printk(KERN_NOTICE "fb%d: Mapped video memory to SQ addr 0x%lx\n",
           fb_info->node, pvr2fb_map);
#endif

    return 0;

out_err:
    if (fb_info->screen_base)
        iounmap(fb_info->screen_base);
    if (par->mmio_base)
        iounmap((void *)par->mmio_base);

    return -ENXIO;
}

#ifdef CONFIG_SH_DREAMCAST
static int __init pvr2fb_dc_init(void)
{
    if (!mach_is_dreamcast())
        return -ENXIO;

    /* Make a guess at the monitor based on the attached cable */
    if (pvr2_init_cable() == CT_VGA) {
        fb_info->monspecs.hfmin = 30000;
        fb_info->monspecs.hfmax = 70000;
        fb_info->monspecs.vfmin = 60;
        fb_info->monspecs.vfmax = 60;
    } else {
        /* Not VGA, using a TV (taken from acornfb) */
        fb_info->monspecs.hfmin = 15469;
        fb_info->monspecs.hfmax = 15781;
        fb_info->monspecs.vfmin = 49;
        fb_info->monspecs.vfmax = 51;
    }

    /*
     * XXX: This needs to pull default video output via BIOS or other means
     */
    if (video_output < 0) {
        if (cable_type == CT_VGA) {
            video_output = VO_VGA;
        } else {
            video_output = VO_NTSC;
        }
    }

    /*
     * Nothing exciting about the DC PVR2 .. only a measly 8MiB.
     */
    pvr2_fix.smem_start = 0xa5000000;   /* RAM starts here */
    pvr2_fix.smem_len   = 8 << 20;

    pvr2_fix.mmio_start = 0xa05f8000;   /* registers start here */
    pvr2_fix.mmio_len   = 0x2000;

    if (request_irq(HW_EVENT_VSYNC, pvr2fb_interrupt, IRQF_SHARED,
                    "pvr2 VBL handler", fb_info)) {
        return -EBUSY;
    }

#ifdef CONFIG_PVR2_DMA
    if (request_dma(pvr2dma, "pvr2") != 0) {
        free_irq(HW_EVENT_VSYNC, fb_info);
        return -EBUSY;
    }
#endif

    return pvr2fb_common_init();
}

static void __exit pvr2fb_dc_exit(void)
{
    if (fb_info->screen_base) {
        iounmap(fb_info->screen_base);
        fb_info->screen_base = NULL;
    }
    if (currentpar->mmio_base) {
        iounmap((void *)currentpar->mmio_base);
        currentpar->mmio_base = 0;
    }

    free_irq(HW_EVENT_VSYNC, fb_info);
#ifdef CONFIG_PVR2_DMA
    free_dma(pvr2dma);
#endif
}
#endif /* CONFIG_SH_DREAMCAST */

#ifdef CONFIG_PCI
static int __devinit pvr2fb_pci_probe(struct pci_dev *pdev,
                      const struct pci_device_id *ent)
{
    int ret;

    ret = pci_enable_device(pdev);
    if (ret) {
        printk(KERN_ERR "pvr2fb: PCI enable failed\n");
        return ret;
    }

    ret = pci_request_regions(pdev, "pvr2fb");
    if (ret) {
        printk(KERN_ERR "pvr2fb: PCI request regions failed\n");
        return ret;
    }

    /*
     * Slightly more exciting than the DC PVR2 .. 16MiB!
     */
    pvr2_fix.smem_start = pci_resource_start(pdev, 0);
    pvr2_fix.smem_len   = pci_resource_len(pdev, 0);

    pvr2_fix.mmio_start = pci_resource_start(pdev, 1);
    pvr2_fix.mmio_len   = pci_resource_len(pdev, 1);

    fb_info->device     = &pdev->dev;

    return pvr2fb_common_init();
}

static void __devexit pvr2fb_pci_remove(struct pci_dev *pdev)
{
    if (fb_info->screen_base) {
        iounmap(fb_info->screen_base);
        fb_info->screen_base = NULL;
    }
    if (currentpar->mmio_base) {
        iounmap((void *)currentpar->mmio_base);
        currentpar->mmio_base = 0;
    }

    pci_release_regions(pdev);
}

static struct pci_device_id pvr2fb_pci_tbl[] __devinitdata = {
    { PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_NEON250,
      PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
    { 0, },
};

MODULE_DEVICE_TABLE(pci, pvr2fb_pci_tbl);

static struct pci_driver pvr2fb_pci_driver = {
    .name       = "pvr2fb",
    .id_table   = pvr2fb_pci_tbl,
    .probe      = pvr2fb_pci_probe,
    .remove     = __devexit_p(pvr2fb_pci_remove),
};

static int __init pvr2fb_pci_init(void)
{
    return pci_register_driver(&pvr2fb_pci_driver);
}

static void __exit pvr2fb_pci_exit(void)
{
    pci_unregister_driver(&pvr2fb_pci_driver);
}
#endif /* CONFIG_PCI */

static int __devinit pvr2_get_param(const struct pvr2_params *p, const char *s,
                                   int val, int size)
{
    int i;

    for (i = 0 ; i < size ; i++ ) {
        if (s != NULL) {
            if (!strnicmp(p[i].name, s, strlen(s)))
                return p[i].val;
        } else {
            if (p[i].val == val)
                return (int)p[i].name;
        }
    }
    return -1;
}

/*
 * Parse command arguments.  Supported arguments are:
 *    inverse                             Use inverse color maps
 *    cable:composite|rgb|vga             Override the video cable type
 *    output:NTSC|PAL|VGA                 Override the video output format
 *
 *    <xres>x<yres>[-<bpp>][@<refresh>]   or,
 *    <name>[-<bpp>][@<refresh>]          Startup using this video mode
 */

#ifndef MODULE
static int __init pvr2fb_setup(char *options)
{
    char *this_opt;
    char cable_arg[80];
    char output_arg[80];

    if (!options || !*options)
        return 0;

    while ((this_opt = strsep(&options, ","))) {
        if (!*this_opt)
            continue;
        if (!strcmp(this_opt, "inverse")) {
            fb_invert_cmaps();
        } else if (!strncmp(this_opt, "cable:", 6)) {
            strcpy(cable_arg, this_opt + 6);
        } else if (!strncmp(this_opt, "output:", 7)) {
            strcpy(output_arg, this_opt + 7);
        } else if (!strncmp(this_opt, "nopan", 5)) {
            nopan = 1;
        } else if (!strncmp(this_opt, "nowrap", 6)) {
            nowrap = 1;
        } else {
            mode_option = this_opt;
        }
    }

    if (*cable_arg)
        cable_type = pvr2_get_param(cables, cable_arg, 0, 3);
    if (*output_arg)
        video_output = pvr2_get_param(outputs, output_arg, 0, 3);

    return 0;
}
#endif

static struct pvr2_board {
    int (*init)(void);
    void (*exit)(void);
    char name[16];
} board_driver[] __refdata = {
#ifdef CONFIG_SH_DREAMCAST
    { pvr2fb_dc_init, pvr2fb_dc_exit, "Sega DC PVR2" },
#endif
#ifdef CONFIG_PCI
    { pvr2fb_pci_init, pvr2fb_pci_exit, "PCI PVR2" },
#endif
    { 0, },
};

static int __init pvr2fb_init(void)
{
    int i, ret = -ENODEV;
    int size;

#ifndef MODULE
    char *option = NULL;

    if (fb_get_options("pvr2fb", &option))
        return -ENODEV;
    pvr2fb_setup(option);
#endif
    size = sizeof(struct fb_info) + sizeof(struct pvr2fb_par) + 16 * sizeof(u32);

    fb_info = framebuffer_alloc(sizeof(struct pvr2fb_par), NULL);

    if (!fb_info) {
        printk(KERN_ERR "Failed to allocate memory for fb_info\n");
        return -ENOMEM;
    }


    currentpar = fb_info->par;

    for (i = 0; i < ARRAY_SIZE(board_driver); i++) {
        struct pvr2_board *pvr_board = board_driver + i;

        if (!pvr_board->init)
            continue;

        ret = pvr_board->init();

        if (ret != 0) {
            printk(KERN_ERR "pvr2fb: Failed init of %s device\n",
                pvr_board->name);
            framebuffer_release(fb_info);
            break;
        }
    }

    return ret;
}

static void __exit pvr2fb_exit(void)
{
    int i;

    for (i = 0; i < ARRAY_SIZE(board_driver); i++) {
        struct pvr2_board *pvr_board = board_driver + i;

        if (pvr_board->exit)
            pvr_board->exit();
    }

#ifdef CONFIG_SH_STORE_QUEUES
    sq_unmap(pvr2fb_map);
#endif

    unregister_framebuffer(fb_info);
    framebuffer_release(fb_info);
}

module_init(pvr2fb_init);
module_exit(pvr2fb_exit);

MODULE_AUTHOR("Paul Mundt <[email protected]>, M. R. Brown <[email protected]>");
MODULE_DESCRIPTION("Framebuffer driver for NEC PowerVR 2 based graphics boards");
MODULE_LICENSE("GPL");