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0001 /*
0002  *  platinumfb.c -- frame buffer device for the PowerMac 'platinum' display
0003  *
0004  *  Copyright (C) 1998 Franz Sirl
0005  *
0006  *  Frame buffer structure from:
0007  *    drivers/video/controlfb.c -- frame buffer device for
0008  *    Apple 'control' display chip.
0009  *    Copyright (C) 1998 Dan Jacobowitz
0010  *
0011  *  Hardware information from:
0012  *    platinum.c: Console support for PowerMac "platinum" display adaptor.
0013  *    Copyright (C) 1996 Paul Mackerras and Mark Abene
0014  *
0015  *  This file is subject to the terms and conditions of the GNU General Public
0016  *  License. See the file COPYING in the main directory of this archive for
0017  *  more details.
0018  */
0019 
0020 #undef DEBUG
0021 
0022 #include <linux/module.h>
0023 #include <linux/kernel.h>
0024 #include <linux/errno.h>
0025 #include <linux/string.h>
0026 #include <linux/mm.h>
0027 #include <linux/vmalloc.h>
0028 #include <linux/delay.h>
0029 #include <linux/interrupt.h>
0030 #include <linux/fb.h>
0031 #include <linux/init.h>
0032 #include <linux/nvram.h>
0033 #include <linux/of_address.h>
0034 #include <linux/of_device.h>
0035 #include <linux/of_platform.h>
0036 
0037 #include "macmodes.h"
0038 #include "platinumfb.h"
0039 
0040 static int default_vmode = VMODE_NVRAM;
0041 static int default_cmode = CMODE_NVRAM;
0042 
0043 struct fb_info_platinum {
0044     struct fb_info          *info;
0045 
0046     int             vmode, cmode;
0047     int             xres, yres;
0048     int             vxres, vyres;
0049     int             xoffset, yoffset;
0050 
0051     struct {
0052         __u8 red, green, blue;
0053     }               palette[256];
0054     u32             pseudo_palette[16];
0055     
0056     volatile struct cmap_regs   __iomem *cmap_regs;
0057     unsigned long           cmap_regs_phys;
0058     
0059     volatile struct platinum_regs   __iomem *platinum_regs;
0060     unsigned long           platinum_regs_phys;
0061     
0062     __u8                __iomem *frame_buffer;
0063     volatile __u8           __iomem *base_frame_buffer;
0064     unsigned long           frame_buffer_phys;
0065     
0066     unsigned long           total_vram;
0067     int             clktype;
0068     int             dactype;
0069 
0070     struct resource         rsrc_fb, rsrc_reg;
0071 };
0072 
0073 /*
0074  * Frame buffer device API
0075  */
0076 
0077 static int platinumfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
0078     u_int transp, struct fb_info *info);
0079 static int platinumfb_blank(int blank_mode, struct fb_info *info);
0080 static int platinumfb_set_par (struct fb_info *info);
0081 static int platinumfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info);
0082 
0083 /*
0084  * internal functions
0085  */
0086 
0087 static inline int platinum_vram_reqd(int video_mode, int color_mode);
0088 static int read_platinum_sense(struct fb_info_platinum *pinfo);
0089 static void set_platinum_clock(struct fb_info_platinum *pinfo);
0090 static void platinum_set_hardware(struct fb_info_platinum *pinfo);
0091 static int platinum_var_to_par(struct fb_var_screeninfo *var,
0092                    struct fb_info_platinum *pinfo,
0093                    int check_only);
0094 
0095 /*
0096  * Interface used by the world
0097  */
0098 
0099 static const struct fb_ops platinumfb_ops = {
0100     .owner =    THIS_MODULE,
0101     .fb_check_var   = platinumfb_check_var,
0102     .fb_set_par = platinumfb_set_par,
0103     .fb_setcolreg   = platinumfb_setcolreg,
0104     .fb_blank   = platinumfb_blank,
0105     .fb_fillrect    = cfb_fillrect,
0106     .fb_copyarea    = cfb_copyarea,
0107     .fb_imageblit   = cfb_imageblit,
0108 };
0109 
0110 /*
0111  * Checks a var structure
0112  */
0113 static int platinumfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info)
0114 {
0115     return platinum_var_to_par(var, info->par, 1);
0116 }
0117 
0118 /*
0119  * Applies current var to display
0120  */
0121 static int platinumfb_set_par (struct fb_info *info)
0122 {
0123     struct fb_info_platinum *pinfo = info->par;
0124     struct platinum_regvals *init;
0125     int err, offset = 0x20;
0126 
0127     if((err = platinum_var_to_par(&info->var, pinfo, 0))) {
0128         printk (KERN_ERR "platinumfb_set_par: error calling"
0129                  " platinum_var_to_par: %d.\n", err);
0130         return err;
0131     }
0132 
0133     platinum_set_hardware(pinfo);
0134 
0135     init = platinum_reg_init[pinfo->vmode-1];
0136     
0137     if ((pinfo->vmode == VMODE_832_624_75) && (pinfo->cmode > CMODE_8))
0138         offset = 0x10;
0139 
0140     info->screen_base = pinfo->frame_buffer + init->fb_offset + offset;
0141     mutex_lock(&info->mm_lock);
0142     info->fix.smem_start = (pinfo->frame_buffer_phys) + init->fb_offset + offset;
0143     mutex_unlock(&info->mm_lock);
0144     info->fix.visual = (pinfo->cmode == CMODE_8) ?
0145         FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
0146     info->fix.line_length = vmode_attrs[pinfo->vmode-1].hres * (1<<pinfo->cmode)
0147         + offset;
0148     printk("line_length: %x\n", info->fix.line_length);
0149     return 0;
0150 }
0151 
0152 static int platinumfb_blank(int blank,  struct fb_info *fb)
0153 {
0154 /*
0155  *  Blank the screen if blank_mode != 0, else unblank. If blank == NULL
0156  *  then the caller blanks by setting the CLUT (Color Look Up Table) to all
0157  *  black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
0158  *  to e.g. a video mode which doesn't support it. Implements VESA suspend
0159  *  and powerdown modes on hardware that supports disabling hsync/vsync:
0160  *    blank_mode == 2: suspend vsync
0161  *    blank_mode == 3: suspend hsync
0162  *    blank_mode == 4: powerdown
0163  */
0164 /* [danj] I think there's something fishy about those constants... */
0165 /*
0166     struct fb_info_platinum *info = (struct fb_info_platinum *) fb;
0167     int ctrl;
0168 
0169     ctrl = le32_to_cpup(&info->platinum_regs->ctrl.r) | 0x33;
0170     if (blank)
0171         --blank_mode;
0172     if (blank & VESA_VSYNC_SUSPEND)
0173         ctrl &= ~3;
0174     if (blank & VESA_HSYNC_SUSPEND)
0175         ctrl &= ~0x30;
0176     out_le32(&info->platinum_regs->ctrl.r, ctrl);
0177 */
0178 /* TODO: Figure out how the heck to powerdown this thing! */
0179     return 0;
0180 }
0181 
0182 static int platinumfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
0183                   u_int transp, struct fb_info *info)
0184 {
0185     struct fb_info_platinum *pinfo = info->par;
0186     volatile struct cmap_regs __iomem *cmap_regs = pinfo->cmap_regs;
0187 
0188     if (regno > 255)
0189         return 1;
0190 
0191     red >>= 8;
0192     green >>= 8;
0193     blue >>= 8;
0194 
0195     pinfo->palette[regno].red = red;
0196     pinfo->palette[regno].green = green;
0197     pinfo->palette[regno].blue = blue;
0198 
0199     out_8(&cmap_regs->addr, regno);     /* tell clut what addr to fill  */
0200     out_8(&cmap_regs->lut, red);        /* send one color channel at    */
0201     out_8(&cmap_regs->lut, green);      /* a time...            */
0202     out_8(&cmap_regs->lut, blue);
0203 
0204     if (regno < 16) {
0205         int i;
0206         u32 *pal = info->pseudo_palette;
0207         switch (pinfo->cmode) {
0208         case CMODE_16:
0209             pal[regno] = (regno << 10) | (regno << 5) | regno;
0210             break;
0211         case CMODE_32:
0212             i = (regno << 8) | regno;
0213             pal[regno] = (i << 16) | i;
0214             break;
0215         }
0216     }
0217     
0218     return 0;
0219 }
0220 
0221 static inline int platinum_vram_reqd(int video_mode, int color_mode)
0222 {
0223     int baseval = vmode_attrs[video_mode-1].hres * (1<<color_mode);
0224 
0225     if ((video_mode == VMODE_832_624_75) && (color_mode > CMODE_8))
0226         baseval += 0x10;
0227     else
0228         baseval += 0x20;
0229 
0230     return vmode_attrs[video_mode-1].vres * baseval + 0x1000;
0231 }
0232 
0233 #define STORE_D2(a, d) { \
0234     out_8(&cmap_regs->addr, (a+32)); \
0235     out_8(&cmap_regs->d2, (d)); \
0236 }
0237 
0238 static void set_platinum_clock(struct fb_info_platinum *pinfo)
0239 {
0240     volatile struct cmap_regs __iomem *cmap_regs = pinfo->cmap_regs;
0241     struct platinum_regvals *init;
0242 
0243     init = platinum_reg_init[pinfo->vmode-1];
0244 
0245     STORE_D2(6, 0xc6);
0246     out_8(&cmap_regs->addr,3+32);
0247 
0248     if (in_8(&cmap_regs->d2) == 2) {
0249         STORE_D2(7, init->clock_params[pinfo->clktype][0]);
0250         STORE_D2(8, init->clock_params[pinfo->clktype][1]);
0251         STORE_D2(3, 3);
0252     } else {
0253         STORE_D2(4, init->clock_params[pinfo->clktype][0]);
0254         STORE_D2(5, init->clock_params[pinfo->clktype][1]);
0255         STORE_D2(3, 2);
0256     }
0257 
0258     __delay(5000);
0259     STORE_D2(9, 0xa6);
0260 }
0261 
0262 
0263 /* Now how about actually saying, Make it so! */
0264 /* Some things in here probably don't need to be done each time. */
0265 static void platinum_set_hardware(struct fb_info_platinum *pinfo)
0266 {
0267     volatile struct platinum_regs   __iomem *platinum_regs = pinfo->platinum_regs;
0268     volatile struct cmap_regs   __iomem *cmap_regs = pinfo->cmap_regs;
0269     struct platinum_regvals     *init;
0270     int             i;
0271     int             vmode, cmode;
0272     
0273     vmode = pinfo->vmode;
0274     cmode = pinfo->cmode;
0275 
0276     init = platinum_reg_init[vmode - 1];
0277 
0278     /* Initialize display timing registers */
0279     out_be32(&platinum_regs->reg[24].r, 7); /* turn display off */
0280 
0281     for (i = 0; i < 26; ++i)
0282         out_be32(&platinum_regs->reg[i+32].r, init->regs[i]);
0283 
0284     out_be32(&platinum_regs->reg[26+32].r, (pinfo->total_vram == 0x100000 ?
0285                         init->offset[cmode] + 4 - cmode :
0286                         init->offset[cmode]));
0287     out_be32(&platinum_regs->reg[16].r, (unsigned) pinfo->frame_buffer_phys+init->fb_offset+0x10);
0288     out_be32(&platinum_regs->reg[18].r, init->pitch[cmode]);
0289     out_be32(&platinum_regs->reg[19].r, (pinfo->total_vram == 0x100000 ?
0290                          init->mode[cmode+1] :
0291                          init->mode[cmode]));
0292     out_be32(&platinum_regs->reg[20].r, (pinfo->total_vram == 0x100000 ? 0x11 : 0x1011));
0293     out_be32(&platinum_regs->reg[21].r, 0x100);
0294     out_be32(&platinum_regs->reg[22].r, 1);
0295     out_be32(&platinum_regs->reg[23].r, 1);
0296     out_be32(&platinum_regs->reg[26].r, 0xc00);
0297     out_be32(&platinum_regs->reg[27].r, 0x235);
0298     /* out_be32(&platinum_regs->reg[27].r, 0x2aa); */
0299 
0300     STORE_D2(0, (pinfo->total_vram == 0x100000 ?
0301              init->dacula_ctrl[cmode] & 0xf :
0302              init->dacula_ctrl[cmode]));
0303     STORE_D2(1, 4);
0304     STORE_D2(2, 0);
0305 
0306     set_platinum_clock(pinfo);
0307 
0308     out_be32(&platinum_regs->reg[24].r, 0); /* turn display on */
0309 }
0310 
0311 /*
0312  * Set misc info vars for this driver
0313  */
0314 static void platinum_init_info(struct fb_info *info,
0315                    struct fb_info_platinum *pinfo)
0316 {
0317     /* Fill fb_info */
0318     info->fbops = &platinumfb_ops;
0319     info->pseudo_palette = pinfo->pseudo_palette;
0320         info->flags = FBINFO_DEFAULT;
0321     info->screen_base = pinfo->frame_buffer + 0x20;
0322 
0323     fb_alloc_cmap(&info->cmap, 256, 0);
0324 
0325     /* Fill fix common fields */
0326     strcpy(info->fix.id, "platinum");
0327     info->fix.mmio_start = pinfo->platinum_regs_phys;
0328     info->fix.mmio_len = 0x1000;
0329     info->fix.type = FB_TYPE_PACKED_PIXELS;
0330     info->fix.smem_start = pinfo->frame_buffer_phys + 0x20; /* will be updated later */
0331     info->fix.smem_len = pinfo->total_vram - 0x20;
0332         info->fix.ywrapstep = 0;
0333     info->fix.xpanstep = 0;
0334     info->fix.ypanstep = 0;
0335         info->fix.type_aux = 0;
0336         info->fix.accel = FB_ACCEL_NONE;
0337 }
0338 
0339 
0340 static int platinum_init_fb(struct fb_info *info)
0341 {
0342     struct fb_info_platinum *pinfo = info->par;
0343     struct fb_var_screeninfo var;
0344     int sense, rc;
0345 
0346     sense = read_platinum_sense(pinfo);
0347     printk(KERN_INFO "platinumfb: Monitor sense value = 0x%x, ", sense);
0348 
0349     if (IS_REACHABLE(CONFIG_NVRAM) && default_vmode == VMODE_NVRAM)
0350         default_vmode = nvram_read_byte(NV_VMODE);
0351     if (default_vmode <= 0 || default_vmode > VMODE_MAX ||
0352         !platinum_reg_init[default_vmode - 1]) {
0353         default_vmode = mac_map_monitor_sense(sense);
0354         if (!platinum_reg_init[default_vmode - 1])
0355             default_vmode = VMODE_640_480_60;
0356     }
0357 
0358     if (IS_REACHABLE(CONFIG_NVRAM) && default_cmode == CMODE_NVRAM)
0359         default_cmode = nvram_read_byte(NV_CMODE);
0360     if (default_cmode < CMODE_8 || default_cmode > CMODE_32)
0361         default_cmode = CMODE_8;
0362     /*
0363      * Reduce the pixel size if we don't have enough VRAM.
0364      */
0365     while(default_cmode > CMODE_8 &&
0366           platinum_vram_reqd(default_vmode, default_cmode) > pinfo->total_vram)
0367         default_cmode--;
0368 
0369     printk("platinumfb:  Using video mode %d and color mode %d.\n", default_vmode, default_cmode);
0370 
0371     /* Setup default var */
0372     if (mac_vmode_to_var(default_vmode, default_cmode, &var) < 0) {
0373         /* This shouldn't happen! */
0374         printk("mac_vmode_to_var(%d, %d,) failed\n", default_vmode, default_cmode);
0375 try_again:
0376         default_vmode = VMODE_640_480_60;
0377         default_cmode = CMODE_8;
0378         if (mac_vmode_to_var(default_vmode, default_cmode, &var) < 0) {
0379             printk(KERN_ERR "platinumfb: mac_vmode_to_var() failed\n");
0380             return -ENXIO;
0381         }
0382     }
0383 
0384     /* Initialize info structure */
0385     platinum_init_info(info, pinfo);
0386 
0387     /* Apply default var */
0388     info->var = var;
0389     var.activate = FB_ACTIVATE_NOW;
0390     rc = fb_set_var(info, &var);
0391     if (rc && (default_vmode != VMODE_640_480_60 || default_cmode != CMODE_8))
0392         goto try_again;
0393 
0394     /* Register with fbdev layer */
0395     rc = register_framebuffer(info);
0396     if (rc < 0)
0397         return rc;
0398 
0399     fb_info(info, "Apple Platinum frame buffer device\n");
0400 
0401     return 0;
0402 }
0403 
0404 /*
0405  * Get the monitor sense value.
0406  * Note that this can be called before calibrate_delay,
0407  * so we can't use udelay.
0408  */
0409 static int read_platinum_sense(struct fb_info_platinum *info)
0410 {
0411     volatile struct platinum_regs __iomem *platinum_regs = info->platinum_regs;
0412     int sense;
0413 
0414     out_be32(&platinum_regs->reg[23].r, 7); /* turn off drivers */
0415     __delay(2000);
0416     sense = (~in_be32(&platinum_regs->reg[23].r) & 7) << 8;
0417 
0418     /* drive each sense line low in turn and collect the other 2 */
0419     out_be32(&platinum_regs->reg[23].r, 3); /* drive A low */
0420     __delay(2000);
0421     sense |= (~in_be32(&platinum_regs->reg[23].r) & 3) << 4;
0422     out_be32(&platinum_regs->reg[23].r, 5); /* drive B low */
0423     __delay(2000);
0424     sense |= (~in_be32(&platinum_regs->reg[23].r) & 4) << 1;
0425     sense |= (~in_be32(&platinum_regs->reg[23].r) & 1) << 2;
0426     out_be32(&platinum_regs->reg[23].r, 6); /* drive C low */
0427     __delay(2000);
0428     sense |= (~in_be32(&platinum_regs->reg[23].r) & 6) >> 1;
0429 
0430     out_be32(&platinum_regs->reg[23].r, 7); /* turn off drivers */
0431 
0432     return sense;
0433 }
0434 
0435 /*
0436  * This routine takes a user-supplied var, and picks the best vmode/cmode from it.
0437  * It also updates the var structure to the actual mode data obtained
0438  */
0439 static int platinum_var_to_par(struct fb_var_screeninfo *var, 
0440                    struct fb_info_platinum *pinfo,
0441                    int check_only)
0442 {
0443     int vmode, cmode;
0444 
0445     if (mac_var_to_vmode(var, &vmode, &cmode) != 0) {
0446         printk(KERN_ERR "platinum_var_to_par: mac_var_to_vmode unsuccessful.\n");
0447         printk(KERN_ERR "platinum_var_to_par: var->xres = %d\n", var->xres);
0448         printk(KERN_ERR "platinum_var_to_par: var->yres = %d\n", var->yres);
0449         printk(KERN_ERR "platinum_var_to_par: var->xres_virtual = %d\n", var->xres_virtual);
0450         printk(KERN_ERR "platinum_var_to_par: var->yres_virtual = %d\n", var->yres_virtual);
0451         printk(KERN_ERR "platinum_var_to_par: var->bits_per_pixel = %d\n", var->bits_per_pixel);
0452         printk(KERN_ERR "platinum_var_to_par: var->pixclock = %d\n", var->pixclock);
0453         printk(KERN_ERR "platinum_var_to_par: var->vmode = %d\n", var->vmode);
0454         return -EINVAL;
0455     }
0456 
0457     if (!platinum_reg_init[vmode-1]) {
0458         printk(KERN_ERR "platinum_var_to_par, vmode %d not valid.\n", vmode);
0459         return -EINVAL;
0460     }
0461 
0462     if (platinum_vram_reqd(vmode, cmode) > pinfo->total_vram) {
0463         printk(KERN_ERR "platinum_var_to_par, not enough ram for vmode %d, cmode %d.\n", vmode, cmode);
0464         return -EINVAL;
0465     }
0466 
0467     if (mac_vmode_to_var(vmode, cmode, var))
0468         return -EINVAL;
0469 
0470     if (check_only)
0471         return 0;
0472 
0473     pinfo->vmode = vmode;
0474     pinfo->cmode = cmode;
0475     pinfo->xres = vmode_attrs[vmode-1].hres;
0476     pinfo->yres = vmode_attrs[vmode-1].vres;
0477     pinfo->xoffset = 0;
0478     pinfo->yoffset = 0;
0479     pinfo->vxres = pinfo->xres;
0480     pinfo->vyres = pinfo->yres;
0481     
0482     return 0;
0483 }
0484 
0485 
0486 /* 
0487  * Parse user specified options (`video=platinumfb:')
0488  */
0489 static int __init platinumfb_setup(char *options)
0490 {
0491     char *this_opt;
0492 
0493     if (!options || !*options)
0494         return 0;
0495 
0496     while ((this_opt = strsep(&options, ",")) != NULL) {
0497         if (!strncmp(this_opt, "vmode:", 6)) {
0498                 int vmode = simple_strtoul(this_opt+6, NULL, 0);
0499             if (vmode > 0 && vmode <= VMODE_MAX)
0500                 default_vmode = vmode;
0501         } else if (!strncmp(this_opt, "cmode:", 6)) {
0502             int depth = simple_strtoul(this_opt+6, NULL, 0);
0503             switch (depth) {
0504              case 0:
0505              case 8:
0506                 default_cmode = CMODE_8;
0507                 break;
0508              case 15:
0509              case 16:
0510                 default_cmode = CMODE_16;
0511                 break;
0512              case 24:
0513              case 32:
0514                 default_cmode = CMODE_32;
0515                 break;
0516             }
0517         }
0518     }
0519     return 0;
0520 }
0521 
0522 #ifdef __powerpc__
0523 #define invalidate_cache(addr) \
0524     asm volatile("eieio; dcbf 0,%1" \
0525     : "=m" (*(addr)) : "r" (addr) : "memory");
0526 #else
0527 #define invalidate_cache(addr)
0528 #endif
0529 
0530 static int platinumfb_probe(struct platform_device* odev)
0531 {
0532     struct device_node  *dp = odev->dev.of_node;
0533     struct fb_info      *info;
0534     struct fb_info_platinum *pinfo;
0535     volatile __u8       *fbuffer;
0536     int         bank0, bank1, bank2, bank3, rc;
0537 
0538     dev_info(&odev->dev, "Found Apple Platinum video hardware\n");
0539 
0540     info = framebuffer_alloc(sizeof(*pinfo), &odev->dev);
0541     if (!info)
0542         return -ENOMEM;
0543 
0544     pinfo = info->par;
0545 
0546     if (of_address_to_resource(dp, 0, &pinfo->rsrc_reg) ||
0547         of_address_to_resource(dp, 1, &pinfo->rsrc_fb)) {
0548         dev_err(&odev->dev, "Can't get resources\n");
0549         framebuffer_release(info);
0550         return -ENXIO;
0551     }
0552     dev_dbg(&odev->dev, " registers  : 0x%llx...0x%llx\n",
0553         (unsigned long long)pinfo->rsrc_reg.start,
0554         (unsigned long long)pinfo->rsrc_reg.end);
0555     dev_dbg(&odev->dev, " framebuffer: 0x%llx...0x%llx\n",
0556         (unsigned long long)pinfo->rsrc_fb.start,
0557         (unsigned long long)pinfo->rsrc_fb.end);
0558 
0559     /* Do not try to request register space, they overlap with the
0560      * northbridge and that can fail. Only request framebuffer
0561      */
0562     if (!request_mem_region(pinfo->rsrc_fb.start,
0563                 resource_size(&pinfo->rsrc_fb),
0564                 "platinumfb framebuffer")) {
0565         printk(KERN_ERR "platinumfb: Can't request framebuffer !\n");
0566         framebuffer_release(info);
0567         return -ENXIO;
0568     }
0569 
0570     /* frame buffer - map only 4MB */
0571     pinfo->frame_buffer_phys = pinfo->rsrc_fb.start;
0572     pinfo->frame_buffer = ioremap_wt(pinfo->rsrc_fb.start, 0x400000);
0573     pinfo->base_frame_buffer = pinfo->frame_buffer;
0574 
0575     /* registers */
0576     pinfo->platinum_regs_phys = pinfo->rsrc_reg.start;
0577     pinfo->platinum_regs = ioremap(pinfo->rsrc_reg.start, 0x1000);
0578 
0579     pinfo->cmap_regs_phys = 0xf301b000; /* XXX not in prom? */
0580     request_mem_region(pinfo->cmap_regs_phys, 0x1000, "platinumfb cmap");
0581     pinfo->cmap_regs = ioremap(pinfo->cmap_regs_phys, 0x1000);
0582 
0583     /* Grok total video ram */
0584     out_be32(&pinfo->platinum_regs->reg[16].r, (unsigned)pinfo->frame_buffer_phys);
0585     out_be32(&pinfo->platinum_regs->reg[20].r, 0x1011); /* select max vram */
0586     out_be32(&pinfo->platinum_regs->reg[24].r, 0);  /* switch in vram */
0587 
0588     fbuffer = pinfo->base_frame_buffer;
0589     fbuffer[0x100000] = 0x34;
0590     fbuffer[0x100008] = 0x0;
0591     invalidate_cache(&fbuffer[0x100000]);
0592     fbuffer[0x200000] = 0x56;
0593     fbuffer[0x200008] = 0x0;
0594     invalidate_cache(&fbuffer[0x200000]);
0595     fbuffer[0x300000] = 0x78;
0596     fbuffer[0x300008] = 0x0;
0597     invalidate_cache(&fbuffer[0x300000]);
0598     bank0 = 1; /* builtin 1MB vram, always there */
0599     bank1 = fbuffer[0x100000] == 0x34;
0600     bank2 = fbuffer[0x200000] == 0x56;
0601     bank3 = fbuffer[0x300000] == 0x78;
0602     pinfo->total_vram = (bank0 + bank1 + bank2 + bank3) * 0x100000;
0603     printk(KERN_INFO "platinumfb: Total VRAM = %dMB (%d%d%d%d)\n",
0604            (unsigned int) (pinfo->total_vram / 1024 / 1024),
0605            bank3, bank2, bank1, bank0);
0606 
0607     /*
0608      * Try to determine whether we have an old or a new DACula.
0609      */
0610     out_8(&pinfo->cmap_regs->addr, 0x40);
0611     pinfo->dactype = in_8(&pinfo->cmap_regs->d2);
0612     switch (pinfo->dactype) {
0613     case 0x3c:
0614         pinfo->clktype = 1;
0615         printk(KERN_INFO "platinumfb: DACula type 0x3c\n");
0616         break;
0617     case 0x84:
0618         pinfo->clktype = 0;
0619         printk(KERN_INFO "platinumfb: DACula type 0x84\n");
0620         break;
0621     default:
0622         pinfo->clktype = 0;
0623         printk(KERN_INFO "platinumfb: Unknown DACula type: %x\n", pinfo->dactype);
0624         break;
0625     }
0626     dev_set_drvdata(&odev->dev, info);
0627     
0628     rc = platinum_init_fb(info);
0629     if (rc != 0) {
0630         iounmap(pinfo->frame_buffer);
0631         iounmap(pinfo->platinum_regs);
0632         iounmap(pinfo->cmap_regs);
0633         framebuffer_release(info);
0634     }
0635 
0636     return rc;
0637 }
0638 
0639 static int platinumfb_remove(struct platform_device* odev)
0640 {
0641     struct fb_info      *info = dev_get_drvdata(&odev->dev);
0642     struct fb_info_platinum *pinfo = info->par;
0643     
0644         unregister_framebuffer (info);
0645     
0646     /* Unmap frame buffer and registers */
0647     iounmap(pinfo->frame_buffer);
0648     iounmap(pinfo->platinum_regs);
0649     iounmap(pinfo->cmap_regs);
0650 
0651     release_mem_region(pinfo->rsrc_fb.start,
0652                resource_size(&pinfo->rsrc_fb));
0653 
0654     release_mem_region(pinfo->cmap_regs_phys, 0x1000);
0655 
0656     framebuffer_release(info);
0657 
0658     return 0;
0659 }
0660 
0661 static struct of_device_id platinumfb_match[] = 
0662 {
0663     {
0664     .name       = "platinum",
0665     },
0666     {},
0667 };
0668 
0669 static struct platform_driver platinum_driver = 
0670 {
0671     .driver = {
0672         .name = "platinumfb",
0673         .of_match_table = platinumfb_match,
0674     },
0675     .probe      = platinumfb_probe,
0676     .remove     = platinumfb_remove,
0677 };
0678 
0679 static int __init platinumfb_init(void)
0680 {
0681 #ifndef MODULE
0682     char *option = NULL;
0683 
0684     if (fb_get_options("platinumfb", &option))
0685         return -ENODEV;
0686     platinumfb_setup(option);
0687 #endif
0688     platform_driver_register(&platinum_driver);
0689 
0690     return 0;
0691 }
0692 
0693 static void __exit platinumfb_exit(void)
0694 {
0695     platform_driver_unregister(&platinum_driver);
0696 }
0697 
0698 MODULE_LICENSE("GPL");
0699 MODULE_DESCRIPTION("framebuffer driver for Apple Platinum video");
0700 module_init(platinumfb_init);
0701 
0702 #ifdef MODULE
0703 module_exit(platinumfb_exit);
0704 #endif
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