valkyriefb.c

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/*
 *  valkyriefb.c -- frame buffer device for the PowerMac 'valkyrie' display
 *
 *  Created 8 August 1998 by 
 *  Martin Costabel <[email protected]> and Kevin Schoedel
 *
 *  Vmode-switching changes and vmode 15/17 modifications created 29 August
 *  1998 by Barry K. Nathan <[email protected]>.
 *
 *  Ported to m68k Macintosh by David Huggins-Daines <[email protected]>
 *
 *  Derived directly from:
 *
 *   controlfb.c -- frame buffer device for the PowerMac 'control' display
 *   Copyright (C) 1998 Dan Jacobowitz <[email protected]>
 *
 *   pmc-valkyrie.c -- Console support for PowerMac "valkyrie" display adaptor.
 *   Copyright (C) 1997 Paul Mackerras.
 *
 *  and indirectly:
 *
 *  Frame buffer structure from:
 *    drivers/video/chipsfb.c -- frame buffer device for
 *    Chips & Technologies 65550 chip.
 *
 *    Copyright (C) 1998 Paul Mackerras
 *
 *    This file is derived from the Powermac "chips" driver:
 *    Copyright (C) 1997 Fabio Riccardi.
 *    And from the frame buffer device for Open Firmware-initialized devices:
 *    Copyright (C) 1997 Geert Uytterhoeven.
 *
 *  Hardware information from:
 *    control.c: Console support for PowerMac "control" display adaptor.
 *    Copyright (C) 1996 Paul Mackerras
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License. See the file COPYING in the main directory of this archive for
 *  more details.
 */

#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/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/selection.h>
#include <linux/init.h>
#include <linux/nvram.h>
#include <linux/adb.h>
#include <linux/cuda.h>
#include <asm/io.h>
#ifdef CONFIG_MAC
#include <asm/bootinfo.h>
#include <asm/macintosh.h>
#else
#include <asm/prom.h>
#endif
#include <asm/pgtable.h>

#include "macmodes.h"
#include "valkyriefb.h"

#ifdef CONFIG_MAC
/* We don't yet have functions to read the PRAM... perhaps we can
   adapt them from the PPC code? */
static int default_vmode = VMODE_CHOOSE;
static int default_cmode = CMODE_8;
#else
static int default_vmode = VMODE_NVRAM;
static int default_cmode = CMODE_NVRAM;
#endif

struct fb_par_valkyrie {
    int vmode, cmode;
    int xres, yres;
    int vxres, vyres;
    struct valkyrie_regvals *init;
};

struct fb_info_valkyrie {
    struct fb_info      info;
    struct fb_par_valkyrie  par;
    struct cmap_regs    __iomem *cmap_regs;
    unsigned long       cmap_regs_phys;
    
    struct valkyrie_regs    __iomem *valkyrie_regs;
    unsigned long       valkyrie_regs_phys;
    
    __u8            __iomem *frame_buffer;
    unsigned long       frame_buffer_phys;
    
    int         sense;
    unsigned long       total_vram;

    u32         pseudo_palette[16];
};

/*
 * Exported functions
 */
int valkyriefb_init(void);
int valkyriefb_setup(char*);

static int valkyriefb_check_var(struct fb_var_screeninfo *var,
                struct fb_info *info);
static int valkyriefb_set_par(struct fb_info *info);
static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
                 u_int transp, struct fb_info *info);
static int valkyriefb_blank(int blank_mode, struct fb_info *info);

static int read_valkyrie_sense(struct fb_info_valkyrie *p);
static void set_valkyrie_clock(unsigned char *params);
static int valkyrie_var_to_par(struct fb_var_screeninfo *var,
    struct fb_par_valkyrie *par, const struct fb_info *fb_info);

static int valkyrie_init_info(struct fb_info *info, struct fb_info_valkyrie *p);
static void valkyrie_par_to_fix(struct fb_par_valkyrie *par, struct fb_fix_screeninfo *fix);
static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p);

static struct fb_ops valkyriefb_ops = {
    .owner =    THIS_MODULE,
    .fb_check_var = valkyriefb_check_var,
    .fb_set_par =   valkyriefb_set_par,
    .fb_setcolreg = valkyriefb_setcolreg,
    .fb_blank = valkyriefb_blank,
    .fb_fillrect    = cfb_fillrect,
    .fb_copyarea    = cfb_copyarea,
    .fb_imageblit   = cfb_imageblit,
};

/* Sets the video mode according to info->var */
static int valkyriefb_set_par(struct fb_info *info)
{
    struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) info;
    volatile struct valkyrie_regs __iomem *valkyrie_regs = p->valkyrie_regs;
    struct fb_par_valkyrie *par = info->par;
    struct valkyrie_regvals *init;
    int err;

    if ((err = valkyrie_var_to_par(&info->var, par, info)))
        return err;

    valkyrie_par_to_fix(par, &info->fix);

    /* Reset the valkyrie */
    out_8(&valkyrie_regs->status.r, 0);
    udelay(100);

    /* Initialize display timing registers */
    init = par->init;
    out_8(&valkyrie_regs->mode.r, init->mode | 0x80);
    out_8(&valkyrie_regs->depth.r, par->cmode + 3);
    set_valkyrie_clock(init->clock_params);
    udelay(100);

    /* Turn on display */
    out_8(&valkyrie_regs->mode.r, init->mode);

    return 0;
}

static inline int valkyrie_par_to_var(struct fb_par_valkyrie *par,
                      struct fb_var_screeninfo *var)
{
    return mac_vmode_to_var(par->vmode, par->cmode, var);
}

static int
valkyriefb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
    int err;
    struct fb_par_valkyrie par;

    if ((err = valkyrie_var_to_par(var, &par, info)))
        return err;
    valkyrie_par_to_var(&par, var);
    return 0;
}

/*
 *  Blank the screen if blank_mode != 0, else unblank. If blank_mode == NULL
 *  then the caller blanks by setting the CLUT (Color Look Up Table) to all
 *  black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
 *  to e.g. a video mode which doesn't support it. Implements VESA suspend
 *  and powerdown modes on hardware that supports disabling hsync/vsync:
 *    blank_mode == 2: suspend vsync
 *    blank_mode == 3: suspend hsync
 *    blank_mode == 4: powerdown
 */
static int valkyriefb_blank(int blank_mode, struct fb_info *info)
{
    struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) info;
    struct fb_par_valkyrie *par = info->par;
    struct valkyrie_regvals *init = par->init;

    if (init == NULL)
        return 1;

    switch (blank_mode) {
    case FB_BLANK_UNBLANK:          /* unblank */
        out_8(&p->valkyrie_regs->mode.r, init->mode);
        break;
    case FB_BLANK_NORMAL:
        return 1;   /* get caller to set CLUT to all black */
    case FB_BLANK_VSYNC_SUSPEND:
    case FB_BLANK_HSYNC_SUSPEND:
        /*
         * [kps] Value extracted from MacOS. I don't know
         * whether this bit disables hsync or vsync, or
         * whether the hardware can do the other as well.
         */
        out_8(&p->valkyrie_regs->mode.r, init->mode | 0x40);
        break;
    case FB_BLANK_POWERDOWN:
        out_8(&p->valkyrie_regs->mode.r, 0x66);
        break;
    }
    return 0;
}

static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
                 u_int transp, struct fb_info *info)
{
    struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) info;
    volatile struct cmap_regs __iomem *cmap_regs = p->cmap_regs;
    struct fb_par_valkyrie *par = info->par;

    if (regno > 255)
        return 1;
    red >>= 8;
    green >>= 8;
    blue >>= 8;

    /* tell clut which address to fill */
    out_8(&p->cmap_regs->addr, regno);
    udelay(1);
    /* send one color channel at a time */
    out_8(&cmap_regs->lut, red);
    out_8(&cmap_regs->lut, green);
    out_8(&cmap_regs->lut, blue);

    if (regno < 16 && par->cmode == CMODE_16)
        ((u32 *)info->pseudo_palette)[regno] =
            (regno << 10) | (regno << 5) | regno;

    return 0;
}

static inline int valkyrie_vram_reqd(int video_mode, int color_mode)
{
    int pitch;
    struct valkyrie_regvals *init = valkyrie_reg_init[video_mode-1];
    
    if ((pitch = init->pitch[color_mode]) == 0)
        pitch = 2 * init->pitch[0];
    return init->vres * pitch;
}

static void set_valkyrie_clock(unsigned char *params)
{
    struct adb_request req;
    int i;

#ifdef CONFIG_ADB_CUDA
    for (i = 0; i < 3; ++i) {
        cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
                 0x50, i + 1, params[i]);
        while (!req.complete)
            cuda_poll();
    }
#endif
}

static void __init valkyrie_choose_mode(struct fb_info_valkyrie *p)
{
    p->sense = read_valkyrie_sense(p);
    printk(KERN_INFO "Monitor sense value = 0x%x\n", p->sense);

    /* Try to pick a video mode out of NVRAM if we have one. */
#if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM)
    if (default_vmode == VMODE_NVRAM) {
        default_vmode = nvram_read_byte(NV_VMODE);
        if (default_vmode <= 0
         || default_vmode > VMODE_MAX
         || !valkyrie_reg_init[default_vmode - 1])
            default_vmode = VMODE_CHOOSE;
    }
#endif
    if (default_vmode == VMODE_CHOOSE)
        default_vmode = mac_map_monitor_sense(p->sense);
    if (!valkyrie_reg_init[default_vmode - 1])
        default_vmode = VMODE_640_480_67;
#if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM)
    if (default_cmode == CMODE_NVRAM)
        default_cmode = nvram_read_byte(NV_CMODE);
#endif

    /*
     * Reduce the pixel size if we don't have enough VRAM or bandwidth.
     */
    if (default_cmode < CMODE_8 || default_cmode > CMODE_16
        || valkyrie_reg_init[default_vmode-1]->pitch[default_cmode] == 0
        || valkyrie_vram_reqd(default_vmode, default_cmode) > p->total_vram)
        default_cmode = CMODE_8;

    printk(KERN_INFO "using video mode %d and color mode %d.\n",
           default_vmode, default_cmode);
}

int __init valkyriefb_init(void)
{
    struct fb_info_valkyrie *p;
    unsigned long frame_buffer_phys, cmap_regs_phys, flags;
    int err;
    char *option = NULL;

    if (fb_get_options("valkyriefb", &option))
        return -ENODEV;
    valkyriefb_setup(option);

#ifdef CONFIG_MAC
    if (!MACH_IS_MAC)
        return -ENODEV;
    if (!(mac_bi_data.id == MAC_MODEL_Q630
          /* I'm not sure about this one */
        || mac_bi_data.id == MAC_MODEL_P588))
        return -ENODEV;

    /* Hardcoded addresses... welcome to 68k Macintosh country :-) */
    frame_buffer_phys = 0xf9000000;
    cmap_regs_phys = 0x50f24000;
    flags = IOMAP_NOCACHE_SER; /* IOMAP_WRITETHROUGH?? */
#else /* ppc (!CONFIG_MAC) */
    {
        struct device_node *dp;
        struct resource r;

        dp = of_find_node_by_name(NULL, "valkyrie");
        if (dp == 0)
            return 0;

        if (of_address_to_resource(dp, 0, &r)) {
            printk(KERN_ERR "can't find address for valkyrie\n");
            return 0;
        }

        frame_buffer_phys = r.start;
        cmap_regs_phys = r.start + 0x304000;
        flags = _PAGE_WRITETHRU;
    }
#endif /* ppc (!CONFIG_MAC) */

    p = kzalloc(sizeof(*p), GFP_ATOMIC);
    if (p == 0)
        return -ENOMEM;

    /* Map in frame buffer and registers */
    if (!request_mem_region(frame_buffer_phys, 0x100000, "valkyriefb")) {
        kfree(p);
        return 0;
    }
    p->total_vram = 0x100000;
    p->frame_buffer_phys = frame_buffer_phys;
    p->frame_buffer = __ioremap(frame_buffer_phys, p->total_vram, flags);
    p->cmap_regs_phys = cmap_regs_phys;
    p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
    p->valkyrie_regs_phys = cmap_regs_phys+0x6000;
    p->valkyrie_regs = ioremap(p->valkyrie_regs_phys, 0x1000);
    err = -ENOMEM;
    if (p->frame_buffer == NULL || p->cmap_regs == NULL
        || p->valkyrie_regs == NULL) {
        printk(KERN_ERR "valkyriefb: couldn't map resources\n");
        goto out_free;
    }

    valkyrie_choose_mode(p);
    mac_vmode_to_var(default_vmode, default_cmode, &p->info.var);
    err = valkyrie_init_info(&p->info, p);
    if (err < 0)
        goto out_free;
    valkyrie_init_fix(&p->info.fix, p);
    if (valkyriefb_set_par(&p->info))
        /* "can't happen" */
        printk(KERN_ERR "valkyriefb: can't set default video mode\n");

    if ((err = register_framebuffer(&p->info)) != 0)
        goto out_cmap_free;

    printk(KERN_INFO "fb%d: valkyrie frame buffer device\n", p->info.node);
    return 0;

 out_cmap_free:
    fb_dealloc_cmap(&p->info.cmap);
 out_free:
    if (p->frame_buffer)
        iounmap(p->frame_buffer);
    if (p->cmap_regs)
        iounmap(p->cmap_regs);
    if (p->valkyrie_regs)
        iounmap(p->valkyrie_regs);
    kfree(p);
    return err;
}

/*
 * Get the monitor sense value.
 */
static int read_valkyrie_sense(struct fb_info_valkyrie *p)
{
    int sense, in;

    out_8(&p->valkyrie_regs->msense.r, 0);   /* release all lines */
    __delay(20000);
    sense = ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x70) << 4;
    /* drive each sense line low in turn and collect the other 2 */
    out_8(&p->valkyrie_regs->msense.r, 4);   /* drive A low */
    __delay(20000);
    sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x30);
    out_8(&p->valkyrie_regs->msense.r, 2);   /* drive B low */
    __delay(20000);
    sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x40) >> 3;
    sense |= (in & 0x10) >> 2;
    out_8(&p->valkyrie_regs->msense.r, 1);   /* drive C low */
    __delay(20000);
    sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x60) >> 5;

    out_8(&p->valkyrie_regs->msense.r, 7);

    return sense;
}

/*
 * This routine takes a user-supplied var,
 * and picks the best vmode/cmode from it.
 */

/* [bkn] I did a major overhaul of this function.
 *
 * Much of the old code was "swiped by jonh from atyfb.c". Because
 * macmodes has mac_var_to_vmode, I felt that it would be better to
 * rework this function to use that, instead of reinventing the wheel to
 * add support for vmode 17. This was reinforced by the fact that
 * the previously swiped atyfb.c code is no longer there.
 *
 * So, I swiped and adapted platinum_var_to_par (from platinumfb.c), replacing
 * most, but not all, of the old code in the process. One side benefit of
 * swiping the platinumfb code is that we now have more comprehensible error
 * messages when a vmode/cmode switch fails. (Most of the error messages are
 * platinumfb.c, but I added two of my own, and I also changed some commas
 * into colons to make the messages more consistent with other Linux error
 * messages.) In addition, I think the new code *might* fix some vmode-
 * switching oddities, but I'm not sure.
 *
 * There may be some more opportunities for cleanup in here, but this is a
 * good start...
 */

static int valkyrie_var_to_par(struct fb_var_screeninfo *var,
    struct fb_par_valkyrie *par, const struct fb_info *fb_info)
{
    int vmode, cmode;
    struct valkyrie_regvals *init;
    struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) fb_info;

    if (mac_var_to_vmode(var, &vmode, &cmode) != 0) {
        printk(KERN_ERR "valkyriefb: can't do %dx%dx%d.\n",
               var->xres, var->yres, var->bits_per_pixel);
        return -EINVAL;
    }

    /* Check if we know about the wanted video mode */
    if (vmode < 1 || vmode > VMODE_MAX || !valkyrie_reg_init[vmode-1]) {
        printk(KERN_ERR "valkyriefb: vmode %d not valid.\n", vmode);
        return -EINVAL;
    }
    
    if (cmode != CMODE_8 && cmode != CMODE_16) {
        printk(KERN_ERR "valkyriefb: cmode %d not valid.\n", cmode);
        return -EINVAL;
    }

    if (var->xres_virtual > var->xres || var->yres_virtual > var->yres
        || var->xoffset != 0 || var->yoffset != 0) {
        return -EINVAL;
    }

    init = valkyrie_reg_init[vmode-1];
    if (init->pitch[cmode] == 0) {
        printk(KERN_ERR "valkyriefb: vmode %d does not support "
               "cmode %d.\n", vmode, cmode);
        return -EINVAL;
    }

    if (valkyrie_vram_reqd(vmode, cmode) > p->total_vram) {
        printk(KERN_ERR "valkyriefb: not enough ram for vmode %d, "
               "cmode %d.\n", vmode, cmode);
        return -EINVAL;
    }

    par->vmode = vmode;
    par->cmode = cmode;
    par->init = init;
    par->xres = var->xres;
    par->yres = var->yres;
    par->vxres = par->xres;
    par->vyres = par->yres;

    return 0;
}

static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p)
{
    memset(fix, 0, sizeof(*fix));
    strcpy(fix->id, "valkyrie");
    fix->mmio_start = p->valkyrie_regs_phys;
    fix->mmio_len = sizeof(struct valkyrie_regs);
    fix->type = FB_TYPE_PACKED_PIXELS;
    fix->smem_start = p->frame_buffer_phys + 0x1000;
    fix->smem_len = p->total_vram;

    fix->type_aux = 0;
    fix->ywrapstep = 0;
    fix->ypanstep = 0;
    fix->xpanstep = 0;
    
}

/* Fix must already be inited above */
static void valkyrie_par_to_fix(struct fb_par_valkyrie *par,
    struct fb_fix_screeninfo *fix)
{
    fix->smem_len = valkyrie_vram_reqd(par->vmode, par->cmode);
    fix->visual = (par->cmode == CMODE_8) ?
        FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
    fix->line_length = par->vxres << par->cmode;
        /* ywrapstep, xpanstep, ypanstep */
}

static int __init valkyrie_init_info(struct fb_info *info,
        struct fb_info_valkyrie *p)
{
    info->fbops = &valkyriefb_ops;
    info->screen_base = p->frame_buffer + 0x1000;
    info->flags = FBINFO_DEFAULT;
    info->pseudo_palette = p->pseudo_palette;
    info->par = &p->par;
    return fb_alloc_cmap(&info->cmap, 256, 0);
}


/*
 * Parse user specified options (`video=valkyriefb:')
 */
int __init valkyriefb_setup(char *options)
{
    char *this_opt;

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

    while ((this_opt = strsep(&options, ",")) != NULL) {
        if (!strncmp(this_opt, "vmode:", 6)) {
                int vmode = simple_strtoul(this_opt+6, NULL, 0);
            if (vmode > 0 && vmode <= VMODE_MAX)
                default_vmode = vmode;
        }
        else if (!strncmp(this_opt, "cmode:", 6)) {
            int depth = simple_strtoul(this_opt+6, NULL, 0);
            switch (depth) {
            case 8:
                default_cmode = CMODE_8;
                break;
            case 15:
            case 16:
                default_cmode = CMODE_16;
                break;
            }
        }
    }
    return 0;
}

module_init(valkyriefb_init);
MODULE_LICENSE("GPL");