Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1102 insertions, 0 deletions

diff --git a/drivers/video/controlfb.c b/drivers/video/controlfb.c
new file mode 100644
index 00000000000..989e700159e
--- /dev/null
+++ b/drivers/video/controlfb.c
@@ -0,0 +1,1102 @@
+/*
+ *  controlfb.c -- frame buffer device for the PowerMac 'control' display
+ *
+ *  Created 12 July 1998 by Dan Jacobowitz <dan@debian.org>
+ *  Copyright (C) 1998 Dan Jacobowitz
+ *  Copyright (C) 2001 Takashi Oe
+ *
+ *  Mmap code by Michel Lanners <mlan@cpu.lu>
+ *
+ *  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
+ *
+ *  Updated to 2.5 framebuffer API by Ben Herrenschmidt
+ *  <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>,
+ *  and James Simmons <jsimmons@infradead.org>.
+ *
+ *  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/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/tty.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/nvram.h>
+#include <linux/adb.h>
+#include <linux/cuda.h>
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/pgtable.h>
+#include <asm/btext.h>
+
+#include "macmodes.h"
+#include "controlfb.h"
+
+struct fb_par_control {
+        int     vmode, cmode;
+        int     xres, yres;
+        int     vxres, vyres;
+        int     xoffset, yoffset;
+        int     pitch;
+        struct control_regvals  regvals;
+        unsigned long sync;
+        unsigned char ctrl;
+};
+
+#define DIRTY(z) ((x)->z != (y)->z)
+#define DIRTY_CMAP(z) (memcmp(&((x)->z), &((y)->z), sizeof((y)->z)))
+static inline int PAR_EQUAL(struct fb_par_control *x, struct fb_par_control *y)
+{
+        int i, results;
+
+        results = 1;
+        for (i = 0; i < 3; i++)
+                results &= !DIRTY(regvals.clock_params[i]);
+        if (!results)
+                return 0;
+        for (i = 0; i < 16; i++)
+                results &= !DIRTY(regvals.regs[i]);
+        if (!results)
+                return 0;
+        return (!DIRTY(cmode) && !DIRTY(xres) && !DIRTY(yres)
+                && !DIRTY(vxres) && !DIRTY(vyres));
+}
+static inline int VAR_MATCH(struct fb_var_screeninfo *x, struct fb_var_screeninfo *y)
+{
+        return (!DIRTY(bits_per_pixel) && !DIRTY(xres)
+                && !DIRTY(yres) && !DIRTY(xres_virtual)
+                && !DIRTY(yres_virtual)
+                && !DIRTY_CMAP(red) && !DIRTY_CMAP(green) && !DIRTY_CMAP(blue));
+}
+
+struct fb_info_control {
+        struct fb_info          info;
+        struct fb_par_control   par;
+        u32                     pseudo_palette[17];
+                
+        struct cmap_regs        __iomem *cmap_regs;
+        unsigned long           cmap_regs_phys;
+        
+        struct control_regs     __iomem *control_regs;
+        unsigned long           control_regs_phys;
+        unsigned long           control_regs_size;
+        
+        __u8                    __iomem *frame_buffer;
+        unsigned long           frame_buffer_phys;
+        unsigned long           fb_orig_base;
+        unsigned long           fb_orig_size;
+
+        int                     control_use_bank2;
+        unsigned long           total_vram;
+        unsigned char           vram_attr;
+};
+
+/* control register access macro */
+#define CNTRL_REG(INFO,REG) (&(((INFO)->control_regs->REG).r))
+
+
+/******************** Prototypes for exported functions ********************/
+/*
+ * struct fb_ops
+ */
+static int controlfb_pan_display(struct fb_var_screeninfo *var,
+        struct fb_info *info);
+static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+        u_int transp, struct fb_info *info);
+static int controlfb_blank(int blank_mode, struct fb_info *info);
+static int controlfb_mmap(struct fb_info *info, struct file *file,
+        struct vm_area_struct *vma);
+static int controlfb_set_par (struct fb_info *info);
+static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info);
+
+/*
+ * inititialization
+ */
+int control_init(void);
+void control_setup(char *);
+
+/******************** Prototypes for internal functions **********************/
+
+static void set_control_clock(unsigned char *params);
+static int init_control(struct fb_info_control *p);
+static void control_set_hardware(struct fb_info_control *p,
+        struct fb_par_control *par);
+static int control_of_init(struct device_node *dp);
+static void find_vram_size(struct fb_info_control *p);
+static int read_control_sense(struct fb_info_control *p);
+static int calc_clock_params(unsigned long clk, unsigned char *param);
+static int control_var_to_par(struct fb_var_screeninfo *var,
+        struct fb_par_control *par, const struct fb_info *fb_info);
+static inline void control_par_to_var(struct fb_par_control *par,
+        struct fb_var_screeninfo *var);
+static void control_init_info(struct fb_info *info, struct fb_info_control *p);
+static void control_cleanup(void);
+
+
+/************************** Internal variables *******************************/
+
+static struct fb_info_control *control_fb;
+
+static int default_vmode __initdata = VMODE_NVRAM;
+static int default_cmode __initdata = CMODE_NVRAM;
+
+
+static struct fb_ops controlfb_ops = {
+        .owner          = THIS_MODULE,
+        .fb_check_var   = controlfb_check_var,
+        .fb_set_par     = controlfb_set_par,
+        .fb_setcolreg   = controlfb_setcolreg,
+        .fb_pan_display = controlfb_pan_display,
+        .fb_blank       = controlfb_blank,
+        .fb_mmap        = controlfb_mmap,
+        .fb_fillrect    = cfb_fillrect,
+        .fb_copyarea    = cfb_copyarea,
+        .fb_imageblit   = cfb_imageblit,
+        .fb_cursor      = soft_cursor,
+};
+
+
+/********************  The functions for controlfb_ops ********************/
+
+#ifdef MODULE
+MODULE_LICENSE("GPL");
+
+int init_module(void)
+{
+        struct device_node *dp;
+
+        dp = find_devices("control");
+        if (dp != 0 && !control_of_init(dp))
+                return 0;
+
+        return -ENXIO;
+}
+
+void cleanup_module(void)
+{
+        control_cleanup();
+}
+#endif
+
+/*
+ * Checks a var structure
+ */
+static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info)
+{
+        struct fb_par_control par;
+        int err;
+
+        err = control_var_to_par(var, &par, info);
+        if (err)
+                return err;     
+        control_par_to_var(&par, var);
+
+        return 0;
+}
+
+/*
+ * Applies current var to display
+ */
+static int controlfb_set_par (struct fb_info *info)
+{
+        struct fb_info_control *p = (struct fb_info_control *) info;
+        struct fb_par_control par;
+        int err;
+
+        if((err = control_var_to_par(&info->var, &par, info))) {
+                printk (KERN_ERR "controlfb_set_par: error calling"
+                                 " control_var_to_par: %d.\n", err);
+                return err;
+        }
+        
+        control_set_hardware(p, &par);
+
+        info->fix.visual = (p->par.cmode == CMODE_8) ?
+                FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
+        info->fix.line_length = p->par.pitch;
+        info->fix.xpanstep = 32 >> p->par.cmode;
+        info->fix.ypanstep = 1;
+
+        return 0;
+}
+
+/*
+ * Set screen start address according to var offset values
+ */
+static inline void set_screen_start(int xoffset, int yoffset,
+        struct fb_info_control *p)
+{
+        struct fb_par_control *par = &p->par;
+
+        par->xoffset = xoffset;
+        par->yoffset = yoffset;
+        out_le32(CNTRL_REG(p,start_addr),
+                 par->yoffset * par->pitch + (par->xoffset << par->cmode));
+}
+
+
+static int controlfb_pan_display(struct fb_var_screeninfo *var,
+                                 struct fb_info *info)
+{
+        unsigned int xoffset, hstep;
+        struct fb_info_control *p = (struct fb_info_control *)info;
+        struct fb_par_control *par = &p->par;
+
+        /*
+         * make sure start addr will be 32-byte aligned
+         */
+        hstep = 0x1f >> par->cmode;
+        xoffset = (var->xoffset + hstep) & ~hstep;
+
+        if (xoffset+par->xres > par->vxres ||
+            var->yoffset+par->yres > par->vyres)
+                return -EINVAL;
+
+        set_screen_start(xoffset, var->yoffset, p);
+
+        return 0;
+}
+
+
+/*
+ * Private mmap since we want to have a different caching on the framebuffer
+ * for controlfb.
+ * Note there's no locking in here; it's done in fb_mmap() in fbmem.c.
+ */
+static int controlfb_mmap(struct fb_info *info, struct file *file,
+                       struct vm_area_struct *vma)
+{
+       unsigned long off, start;
+       u32 len;
+
+       off = vma->vm_pgoff << PAGE_SHIFT;
+
+       /* frame buffer memory */
+       start = info->fix.smem_start;
+       len = PAGE_ALIGN((start & ~PAGE_MASK)+info->fix.smem_len);
+       if (off >= len) {
+               /* memory mapped io */
+               off -= len;
+               if (info->var.accel_flags)
+                       return -EINVAL;
+               start = info->fix.mmio_start;
+               len = PAGE_ALIGN((start & ~PAGE_MASK)+info->fix.mmio_len);
+               pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE|_PAGE_GUARDED;
+       } else {
+               /* framebuffer */
+               pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU;
+       }
+       start &= PAGE_MASK;
+       if ((vma->vm_end - vma->vm_start + off) > len)
+                return -EINVAL;
+       off += start;
+       vma->vm_pgoff = off >> PAGE_SHIFT;
+       if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
+           vma->vm_end - vma->vm_start, vma->vm_page_prot))
+               return -EAGAIN;
+
+       return 0;
+}
+
+static int controlfb_blank(int blank_mode, struct fb_info *info)
+{
+        struct fb_info_control *p = (struct fb_info_control *) info;
+        unsigned ctrl;
+
+        ctrl = ld_le32(CNTRL_REG(p,ctrl));
+        if (blank_mode > 0)
+                switch (blank_mode) {
+                case FB_BLANK_VSYNC_SUSPEND:
+                        ctrl &= ~3;
+                        break;
+                case FB_BLANK_HSYNC_SUSPEND:
+                        ctrl &= ~0x30;
+                        break;
+                case FB_BLANK_POWERDOWN:
+                        ctrl &= ~0x33;
+                        /* fall through */
+                case FB_BLANK_NORMAL:
+                        ctrl |= 0x400;
+                        break;
+                default:
+                        break;
+                }
+        else {
+                ctrl &= ~0x400;
+                ctrl |= 0x33;
+        }
+        out_le32(CNTRL_REG(p,ctrl), ctrl);
+
+        return 0;
+}
+
+static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+                             u_int transp, struct fb_info *info)
+{
+        struct fb_info_control *p = (struct fb_info_control *) info;
+        __u8 r, g, b;
+
+        if (regno > 255)
+                return 1;
+
+        r = red >> 8;
+        g = green >> 8;
+        b = blue >> 8;
+
+        out_8(&p->cmap_regs->addr, regno);      /* tell clut what addr to fill  */
+        out_8(&p->cmap_regs->lut, r);           /* send one color channel at    */
+        out_8(&p->cmap_regs->lut, g);           /* a time...                    */
+        out_8(&p->cmap_regs->lut, b);
+
+        if (regno < 16) {
+                int i;
+                switch (p->par.cmode) {
+                case CMODE_16:
+                        p->pseudo_palette[regno] =
+                            (regno << 10) | (regno << 5) | regno;
+                        break;
+                case CMODE_32:
+                        i = (regno << 8) | regno;
+                        p->pseudo_palette[regno] = (i << 16) | i;
+                        break;
+                }
+        }
+
+        return 0;
+}
+
+
+/********************  End of controlfb_ops implementation  ******************/
+
+
+
+static void set_control_clock(unsigned char *params)
+{
+#ifdef CONFIG_ADB_CUDA
+        struct adb_request req;
+        int i;
+
+        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  
+}
+
+
+/*
+ * finish off the driver initialization and register
+ */
+static int __init init_control(struct fb_info_control *p)
+{
+        int full, sense, vmode, cmode, vyres;
+        struct fb_var_screeninfo var;
+        int rc;
+        
+        printk(KERN_INFO "controlfb: ");
+
+        full = p->total_vram == 0x400000;
+
+        /* Try to pick a video mode out of NVRAM if we have one. */
+        if (default_cmode == CMODE_NVRAM){
+                cmode = nvram_read_byte(NV_CMODE);
+                if(cmode < CMODE_8 || cmode > CMODE_32)
+                        cmode = CMODE_8;
+        } else
+                cmode=default_cmode;
+
+        if (default_vmode == VMODE_NVRAM) {
+                vmode = nvram_read_byte(NV_VMODE);
+                if (vmode < 1 || vmode > VMODE_MAX ||
+                    control_mac_modes[vmode - 1].m[full] < cmode) {
+                        sense = read_control_sense(p);
+                        printk("Monitor sense value = 0x%x, ", sense);
+                        vmode = mac_map_monitor_sense(sense);
+                        if (control_mac_modes[vmode - 1].m[full] < cmode)
+                                vmode = VMODE_640_480_60;
+                }
+        } else {
+                vmode=default_vmode;
+                if (control_mac_modes[vmode - 1].m[full] < cmode) {
+                        if (cmode > CMODE_8)
+                                cmode--;
+                        else
+                                vmode = VMODE_640_480_60;
+                }
+        }
+
+        /* Initialize info structure */
+        control_init_info(&p->info, p);
+
+        /* Setup default var */
+        if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
+                /* This shouldn't happen! */
+                printk("mac_vmode_to_var(%d, %d,) failed\n", vmode, cmode);
+try_again:
+                vmode = VMODE_640_480_60;
+                cmode = CMODE_8;
+                if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
+                        printk(KERN_ERR "controlfb: mac_vmode_to_var() failed\n");
+                        return -ENXIO;
+                }
+                printk(KERN_INFO "controlfb: ");
+        }
+        printk("using video mode %d and color mode %d.\n", vmode, cmode);
+
+        vyres = (p->total_vram - CTRLFB_OFF) / (var.xres << cmode);
+        if (vyres > var.yres)
+                var.yres_virtual = vyres;
+
+        /* Apply default var */
+        var.activate = FB_ACTIVATE_NOW;
+        rc = fb_set_var(&p->info, &var);
+        if (rc && (vmode != VMODE_640_480_60 || cmode != CMODE_8))
+                goto try_again;
+
+        /* Register with fbdev layer */
+        if (register_framebuffer(&p->info) < 0)
+                return -ENXIO;
+        
+        printk(KERN_INFO "fb%d: control display adapter\n", p->info.node);      
+
+        return 0;
+}
+
+#define RADACAL_WRITE(a,d) \
+        out_8(&p->cmap_regs->addr, (a)); \
+        out_8(&p->cmap_regs->dat,   (d))
+
+/* Now how about actually saying, Make it so! */
+/* Some things in here probably don't need to be done each time. */
+static void control_set_hardware(struct fb_info_control *p, struct fb_par_control *par)
+{
+        struct control_regvals  *r;
+        volatile struct preg    __iomem *rp;
+        int                     i, cmode;
+
+        if (PAR_EQUAL(&p->par, par)) {
+                /*
+                 * check if only xoffset or yoffset differs.
+                 * this prevents flickers in typical VT switch case.
+                 */
+                if (p->par.xoffset != par->xoffset ||
+                    p->par.yoffset != par->yoffset)
+                        set_screen_start(par->xoffset, par->yoffset, p);
+                        
+                return;
+        }
+        
+        p->par = *par;
+        cmode = p->par.cmode;
+        r = &par->regvals;
+        
+        /* Turn off display */
+        out_le32(CNTRL_REG(p,ctrl), 0x400 | par->ctrl);
+        
+        set_control_clock(r->clock_params);
+        
+        RADACAL_WRITE(0x20, r->radacal_ctrl);
+        RADACAL_WRITE(0x21, p->control_use_bank2 ? 0 : 1);
+        RADACAL_WRITE(0x10, 0);
+        RADACAL_WRITE(0x11, 0);
+
+        rp = &p->control_regs->vswin;
+        for (i = 0; i < 16; ++i, ++rp)
+                out_le32(&rp->r, r->regs[i]);
+        
+        out_le32(CNTRL_REG(p,pitch), par->pitch);
+        out_le32(CNTRL_REG(p,mode), r->mode);
+        out_le32(CNTRL_REG(p,vram_attr), p->vram_attr);
+        out_le32(CNTRL_REG(p,start_addr), par->yoffset * par->pitch
+                 + (par->xoffset << cmode));
+        out_le32(CNTRL_REG(p,rfrcnt), 0x1e5);
+        out_le32(CNTRL_REG(p,intr_ena), 0);
+
+        /* Turn on display */
+        out_le32(CNTRL_REG(p,ctrl), par->ctrl);
+
+#ifdef CONFIG_BOOTX_TEXT
+        btext_update_display(p->frame_buffer_phys + CTRLFB_OFF,
+                             p->par.xres, p->par.yres,
+                             (cmode == CMODE_32? 32: cmode == CMODE_16? 16: 8),
+                             p->par.pitch);
+#endif /* CONFIG_BOOTX_TEXT */
+}
+
+
+/*
+ * Called from fbmem.c for probing & initializing
+ */
+int __init control_init(void)
+{
+        struct device_node *dp;
+        char *option = NULL;
+
+        if (fb_get_options("controlfb", &option))
+                return -ENODEV;
+        control_setup(option);
+
+        dp = find_devices("control");
+        if (dp != 0 && !control_of_init(dp))
+                return 0;
+
+        return -ENXIO;
+}
+
+module_init(control_init);
+
+/* Work out which banks of VRAM we have installed. */
+/* danj: I guess the card just ignores writes to nonexistant VRAM... */
+
+static void __init find_vram_size(struct fb_info_control *p)
+{
+        int bank1, bank2;
+
+        /*
+         * Set VRAM in 2MB (bank 1) mode
+         * VRAM Bank 2 will be accessible through offset 0x600000 if present
+         * and VRAM Bank 1 will not respond at that offset even if present
+         */
+        out_le32(CNTRL_REG(p,vram_attr), 0x31);
+
+        out_8(&p->frame_buffer[0x600000], 0xb3);
+        out_8(&p->frame_buffer[0x600001], 0x71);
+        asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0x600000])
+                                        : "memory" );
+        mb();
+        asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0x600000])
+                                        : "memory" );
+        mb();
+
+        bank2 = (in_8(&p->frame_buffer[0x600000]) == 0xb3)
+                && (in_8(&p->frame_buffer[0x600001]) == 0x71);
+
+        /*
+         * Set VRAM in 2MB (bank 2) mode
+         * VRAM Bank 1 will be accessible through offset 0x000000 if present
+         * and VRAM Bank 2 will not respond at that offset even if present
+         */
+        out_le32(CNTRL_REG(p,vram_attr), 0x39);
+
+        out_8(&p->frame_buffer[0], 0x5a);
+        out_8(&p->frame_buffer[1], 0xc7);
+        asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0])
+                                        : "memory" );
+        mb();
+        asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0])
+                                        : "memory" );
+        mb();
+
+        bank1 = (in_8(&p->frame_buffer[0]) == 0x5a)
+                && (in_8(&p->frame_buffer[1]) == 0xc7);
+
+        if (bank2) {
+                if (!bank1) {
+                        /*
+                         * vram bank 2 only
+                         */
+                        p->control_use_bank2 = 1;
+                        p->vram_attr = 0x39;
+                        p->frame_buffer += 0x600000;
+                        p->frame_buffer_phys += 0x600000;
+                } else {
+                        /*
+                         * 4 MB vram
+                         */
+                        p->vram_attr = 0x51;
+                }
+        } else {
+                /*
+                 * vram bank 1 only
+                 */
+                p->vram_attr = 0x31;
+        }
+
+        p->total_vram = (bank1 + bank2) * 0x200000;
+
+        printk(KERN_INFO "controlfb: VRAM Total = %dMB "
+                        "(%dMB @ bank 1, %dMB @ bank 2)\n",
+                        (bank1 + bank2) << 1, bank1 << 1, bank2 << 1);
+}
+
+
+/*
+ * find "control" and initialize
+ */
+static int __init control_of_init(struct device_node *dp)
+{
+        struct fb_info_control  *p;
+        unsigned long           addr;
+        int                     i;
+
+        if (control_fb) {
+                printk(KERN_ERR "controlfb: only one control is supported\n");
+                return -ENXIO;
+        }
+        if(dp->n_addrs != 2) {
+                printk(KERN_ERR "expecting 2 address for control (got %d)", dp->n_addrs);
+                return -ENXIO;
+        }
+        p = kmalloc(sizeof(*p), GFP_KERNEL);
+        if (p == 0)
+                return -ENXIO;
+        control_fb = p; /* save it for cleanups */
+        memset(p, 0, sizeof(*p));
+
+        /* Map in frame buffer and registers */
+        for (i = 0; i < dp->n_addrs; ++i) {
+                addr = dp->addrs[i].address;
+                if (dp->addrs[i].size >= 0x800000) {
+                        p->fb_orig_base = addr;
+                        p->fb_orig_size = dp->addrs[i].size;
+                        /* use the big-endian aperture (??) */
+                        p->frame_buffer_phys = addr + 0x800000;
+                } else {
+                        p->control_regs_phys = addr;
+                        p->control_regs_size = dp->addrs[i].size;
+                }
+        }
+
+        if (!p->fb_orig_base ||
+            !request_mem_region(p->fb_orig_base,p->fb_orig_size,"controlfb")) {
+                p->fb_orig_base = 0;
+                goto error_out;
+        }
+        /* map at most 8MB for the frame buffer */
+        p->frame_buffer = __ioremap(p->frame_buffer_phys, 0x800000,
+                                    _PAGE_WRITETHRU);
+
+        if (!p->control_regs_phys ||
+            !request_mem_region(p->control_regs_phys, p->control_regs_size,
+            "controlfb regs")) {
+                p->control_regs_phys = 0;
+                goto error_out;
+        }
+        p->control_regs = ioremap(p->control_regs_phys, p->control_regs_size);
+
+        p->cmap_regs_phys = 0xf301b000;  /* XXX not in prom? */
+        if (!request_mem_region(p->cmap_regs_phys, 0x1000, "controlfb cmap")) {
+                p->cmap_regs_phys = 0;
+                goto error_out;
+        }
+        p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
+
+        if (!p->cmap_regs || !p->control_regs || !p->frame_buffer)
+                goto error_out;
+
+        find_vram_size(p);
+        if (!p->total_vram)
+                goto error_out;
+
+        if (init_control(p) < 0)
+                goto error_out;
+
+        return 0;
+
+error_out:
+        control_cleanup();
+        return -ENXIO;
+}
+
+/*
+ * Get the monitor sense value.
+ * Note that this can be called before calibrate_delay,
+ * so we can't use udelay.
+ */
+static int read_control_sense(struct fb_info_control *p)
+{
+        int sense;
+
+        out_le32(CNTRL_REG(p,mon_sense), 7);    /* drive all lines high */
+        __delay(200);
+        out_le32(CNTRL_REG(p,mon_sense), 077);  /* turn off drivers */
+        __delay(2000);
+        sense = (in_le32(CNTRL_REG(p,mon_sense)) & 0x1c0) << 2;
+
+        /* drive each sense line low in turn and collect the other 2 */
+        out_le32(CNTRL_REG(p,mon_sense), 033);  /* drive A low */
+        __delay(2000);
+        sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0xc0) >> 2;
+        out_le32(CNTRL_REG(p,mon_sense), 055);  /* drive B low */
+        __delay(2000);
+        sense |= ((in_le32(CNTRL_REG(p,mon_sense)) & 0x100) >> 5)
+                | ((in_le32(CNTRL_REG(p,mon_sense)) & 0x40) >> 4);
+        out_le32(CNTRL_REG(p,mon_sense), 066);  /* drive C low */
+        __delay(2000);
+        sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0x180) >> 7;
+
+        out_le32(CNTRL_REG(p,mon_sense), 077);  /* turn off drivers */
+        
+        return sense;
+}
+
+/**********************  Various translation functions  **********************/
+
+#define CONTROL_PIXCLOCK_BASE   256016
+#define CONTROL_PIXCLOCK_MIN    5000    /* ~ 200 MHz dot clock */
+
+/*
+ * calculate the clock paramaters to be sent to CUDA according to given
+ * pixclock in pico second.
+ */
+static int calc_clock_params(unsigned long clk, unsigned char *param)
+{
+        unsigned long p0, p1, p2, k, l, m, n, min;
+
+        if (clk > (CONTROL_PIXCLOCK_BASE << 3))
+                return 1;
+
+        p2 = ((clk << 4) < CONTROL_PIXCLOCK_BASE)? 3: 2;
+        l = clk << p2;
+        p0 = 0;
+        p1 = 0;
+        for (k = 1, min = l; k < 32; k++) {
+                unsigned long rem;
+
+                m = CONTROL_PIXCLOCK_BASE * k;
+                n = m / l;
+                rem = m % l;
+                if (n && (n < 128) && rem < min) {
+                        p0 = k;
+                        p1 = n;
+                        min = rem;
+                }
+        }
+        if (!p0 || !p1)
+                return 1;
+
+        param[0] = p0;
+        param[1] = p1;
+        param[2] = p2;
+
+        return 0;
+}
+
+
+/*
+ * This routine takes a user-supplied var, and picks the best vmode/cmode
+ * from it.
+ */
+
+static int control_var_to_par(struct fb_var_screeninfo *var,
+        struct fb_par_control *par, const struct fb_info *fb_info)
+{
+        int cmode, piped_diff, hstep;
+        unsigned hperiod, hssync, hsblank, hesync, heblank, piped, heq, hlfln,
+                 hserr, vperiod, vssync, vesync, veblank, vsblank, vswin, vewin;
+        unsigned long pixclock;
+        struct fb_info_control *p = (struct fb_info_control *) fb_info;
+        struct control_regvals *r = &par->regvals;
+
+        switch (var->bits_per_pixel) {
+        case 8:
+                par->cmode = CMODE_8;
+                if (p->total_vram > 0x200000) {
+                        r->mode = 3;
+                        r->radacal_ctrl = 0x20;
+                        piped_diff = 13;
+                } else {
+                        r->mode = 2;
+                        r->radacal_ctrl = 0x10;
+                        piped_diff = 9;
+                }
+                break;
+        case 15:
+        case 16:
+                par->cmode = CMODE_16;
+                if (p->total_vram > 0x200000) {
+                        r->mode = 2;
+                        r->radacal_ctrl = 0x24;
+                        piped_diff = 5;
+                } else {
+                        r->mode = 1;
+                        r->radacal_ctrl = 0x14;
+                        piped_diff = 3;
+                }
+                break;
+        case 32:
+                par->cmode = CMODE_32;
+                if (p->total_vram > 0x200000) {
+                        r->mode = 1;
+                        r->radacal_ctrl = 0x28;
+                } else {
+                        r->mode = 0;
+                        r->radacal_ctrl = 0x18;
+                }
+                piped_diff = 1;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        /*
+         * adjust xres and vxres so that the corresponding memory widths are
+         * 32-byte aligned
+         */
+        hstep = 31 >> par->cmode;
+        par->xres = (var->xres + hstep) & ~hstep;
+        par->vxres = (var->xres_virtual + hstep) & ~hstep;
+        par->xoffset = (var->xoffset + hstep) & ~hstep;
+        if (par->vxres < par->xres)
+                par->vxres = par->xres;
+        par->pitch = par->vxres << par->cmode;
+
+        par->yres = var->yres;
+        par->vyres = var->yres_virtual;
+        par->yoffset = var->yoffset;
+        if (par->vyres < par->yres)
+                par->vyres = par->yres;
+
+        par->sync = var->sync;
+
+        if (par->pitch * par->vyres + CTRLFB_OFF > p->total_vram)
+                return -EINVAL;
+
+        if (par->xoffset + par->xres > par->vxres)
+                par->xoffset = par->vxres - par->xres;
+        if (par->yoffset + par->yres > par->vyres)
+                par->yoffset = par->vyres - par->yres;
+
+        pixclock = (var->pixclock < CONTROL_PIXCLOCK_MIN)? CONTROL_PIXCLOCK_MIN:
+                   var->pixclock;
+        if (calc_clock_params(pixclock, r->clock_params))
+                return -EINVAL;
+
+        hperiod = ((var->left_margin + par->xres + var->right_margin
+                    + var->hsync_len) >> 1) - 2;
+        hssync = hperiod + 1;
+        hsblank = hssync - (var->right_margin >> 1);
+        hesync = (var->hsync_len >> 1) - 1;
+        heblank = (var->left_margin >> 1) + hesync;
+        piped = heblank - piped_diff;
+        heq = var->hsync_len >> 2;
+        hlfln = (hperiod+2) >> 1;
+        hserr = hssync-hesync;
+        vperiod = (var->vsync_len + var->lower_margin + par->yres
+                   + var->upper_margin) << 1;
+        vssync = vperiod - 2;
+        vesync = (var->vsync_len << 1) - vperiod + vssync;
+        veblank = (var->upper_margin << 1) + vesync;
+        vsblank = vssync - (var->lower_margin << 1);
+        vswin = (vsblank+vssync) >> 1;
+        vewin = (vesync+veblank) >> 1;
+
+        r->regs[0] = vswin;
+        r->regs[1] = vsblank;
+        r->regs[2] = veblank;
+        r->regs[3] = vewin;
+        r->regs[4] = vesync;
+        r->regs[5] = vssync;
+        r->regs[6] = vperiod;
+        r->regs[7] = piped;
+        r->regs[8] = hperiod;
+        r->regs[9] = hsblank;
+        r->regs[10] = heblank;
+        r->regs[11] = hesync;
+        r->regs[12] = hssync;
+        r->regs[13] = heq;
+        r->regs[14] = hlfln;
+        r->regs[15] = hserr;
+
+        if (par->xres >= 1280 && par->cmode >= CMODE_16)
+                par->ctrl = 0x7f;
+        else
+                par->ctrl = 0x3b;
+
+        if (mac_var_to_vmode(var, &par->vmode, &cmode))
+                par->vmode = 0;
+
+        return 0;
+}
+
+
+/*
+ * Convert hardware data in par to an fb_var_screeninfo
+ */
+
+static void control_par_to_var(struct fb_par_control *par, struct fb_var_screeninfo *var)
+{
+        struct control_regints *rv;
+        
+        rv = (struct control_regints *) par->regvals.regs;
+        
+        memset(var, 0, sizeof(*var));
+        var->xres = par->xres;
+        var->yres = par->yres;
+        var->xres_virtual = par->vxres;
+        var->yres_virtual = par->vyres;
+        var->xoffset = par->xoffset;
+        var->yoffset = par->yoffset;
+        
+        switch(par->cmode) {
+        default:
+        case CMODE_8:
+                var->bits_per_pixel = 8;
+                var->red.length = 8;
+                var->green.length = 8;
+                var->blue.length = 8;
+                break;
+        case CMODE_16:  /* RGB 555 */
+                var->bits_per_pixel = 16;
+                var->red.offset = 10;
+                var->red.length = 5;
+                var->green.offset = 5;
+                var->green.length = 5;
+                var->blue.length = 5;
+                break;
+        case CMODE_32:  /* RGB 888 */
+                var->bits_per_pixel = 32;
+                var->red.offset = 16;
+                var->red.length = 8;
+                var->green.offset = 8;
+                var->green.length = 8;
+                var->blue.length = 8;
+                var->transp.offset = 24;
+                var->transp.length = 8;
+                break;
+        }
+        var->height = -1;
+        var->width = -1;
+        var->vmode = FB_VMODE_NONINTERLACED;
+
+        var->left_margin = (rv->heblank - rv->hesync) << 1;
+        var->right_margin = (rv->hssync - rv->hsblank) << 1;
+        var->hsync_len = (rv->hperiod + 2 - rv->hssync + rv->hesync) << 1;
+
+        var->upper_margin = (rv->veblank - rv->vesync) >> 1;
+        var->lower_margin = (rv->vssync - rv->vsblank) >> 1;
+        var->vsync_len = (rv->vperiod - rv->vssync + rv->vesync) >> 1;
+
+        var->sync = par->sync;
+
+        /*
+         * 10^12 * clock_params[0] / (3906400 * clock_params[1]
+         *                            * 2^clock_params[2])
+         * (10^12 * clock_params[0] / (3906400 * clock_params[1]))
+         * >> clock_params[2]
+         */
+        /* (255990.17 * clock_params[0] / clock_params[1]) >> clock_params[2] */
+        var->pixclock = CONTROL_PIXCLOCK_BASE * par->regvals.clock_params[0];
+        var->pixclock /= par->regvals.clock_params[1];
+        var->pixclock >>= par->regvals.clock_params[2];
+}
+
+/*
+ * Set misc info vars for this driver
+ */
+static void __init control_init_info(struct fb_info *info, struct fb_info_control *p)
+{
+        /* Fill fb_info */
+        info->par = &p->par;
+        info->fbops = &controlfb_ops;
+        info->pseudo_palette = p->pseudo_palette;
+        info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
+        info->screen_base = p->frame_buffer + CTRLFB_OFF;
+
+        fb_alloc_cmap(&info->cmap, 256, 0);
+
+        /* Fill fix common fields */
+        strcpy(info->fix.id, "control");
+        info->fix.mmio_start = p->control_regs_phys;
+        info->fix.mmio_len = sizeof(struct control_regs);
+        info->fix.type = FB_TYPE_PACKED_PIXELS;
+        info->fix.smem_start = p->frame_buffer_phys + CTRLFB_OFF;
+        info->fix.smem_len = p->total_vram - CTRLFB_OFF;
+        info->fix.ywrapstep = 0;
+        info->fix.type_aux = 0;
+        info->fix.accel = FB_ACCEL_NONE;
+}
+
+
+static void control_cleanup(void)
+{
+        struct fb_info_control  *p = control_fb;
+
+        if (!p)
+                return;
+
+        if (p->cmap_regs)
+                iounmap(p->cmap_regs);
+        if (p->control_regs)
+                iounmap(p->control_regs);
+        if (p->frame_buffer) {
+                if (p->control_use_bank2)
+                        p->frame_buffer -= 0x600000;
+                iounmap(p->frame_buffer);
+        }
+        if (p->cmap_regs_phys)
+                release_mem_region(p->cmap_regs_phys, 0x1000);
+        if (p->control_regs_phys)
+                release_mem_region(p->control_regs_phys, p->control_regs_size);
+        if (p->fb_orig_base)
+                release_mem_region(p->fb_orig_base, p->fb_orig_size);
+        kfree(p);
+}
+
+
+/*
+ * Parse user speficied options (`video=controlfb:')
+ */
+void __init control_setup(char *options)
+{
+        char *this_opt;
+
+        if (!options || !*options)
+                return;
+
+        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 &&
+                            control_mac_modes[vmode - 1].m[1] >= 0)
+                                default_vmode = vmode;
+                } else if (!strncmp(this_opt, "cmode:", 6)) {
+                        int depth = simple_strtoul(this_opt+6, NULL, 0);
+                        switch (depth) {
+                         case CMODE_8:
+                         case CMODE_16:
+                         case CMODE_32:
+                                default_cmode = depth;
+                                break;
+                         case 8:
+                                default_cmode = CMODE_8;
+                                break;
+                         case 15:
+                         case 16:
+                                default_cmode = CMODE_16;
+                                break;
+                         case 24:
+                         case 32:
+                                default_cmode = CMODE_32;
+                                break;
+                        }
+                }
+        }
+}
+