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controlfb.c

/*
 *  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/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/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[16];
            
      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 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);

/******************** 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,
};


/********************  The functions for controlfb_ops ********************/

#ifdef MODULE
MODULE_LICENSE("GPL");

int init_module(void)
{
      struct device_node *dp;
      int ret = -ENXIO;

      dp = of_find_node_by_name(NULL, "control");
      if (dp != 0 && !control_of_init(dp))
            ret = 0;
      of_node_put(dp);

      return ret;
}

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 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. */
#ifdef CONFIG_NVRAM
      if (default_cmode == CMODE_NVRAM){
            cmode = nvram_read_byte(NV_CMODE);
            if(cmode < CMODE_8 || cmode > CMODE_32)
                  cmode = CMODE_8;
      } else
#endif
            cmode=default_cmode;
#ifdef CONFIG_NVRAM
      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
#endif
      {
            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 */
}


/*
 * Parse user speficied options (`video=controlfb:')
 */
static 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;
                  }
            }
      }
}

static int __init control_init(void)
{
      struct device_node *dp;
      char *option = NULL;
      int ret = -ENXIO;

      if (fb_get_options("controlfb", &option))
            return -ENODEV;
      control_setup(option);

      dp = of_find_node_by_name(NULL, "control");
      if (dp != 0 && !control_of_init(dp))
            ret = 0;
      of_node_put(dp);

      return ret;
}

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;
      struct resource         fb_res, reg_res;

      if (control_fb) {
            printk(KERN_ERR "controlfb: only one control is supported\n");
            return -ENXIO;
      }

      if (of_pci_address_to_resource(dp, 2, &fb_res) ||
          of_pci_address_to_resource(dp, 1, &reg_res)) {
            printk(KERN_ERR "can't get 2 addresses for control\n");
            return -ENXIO;
      }
      p = kzalloc(sizeof(*p), GFP_KERNEL);
      if (p == 0)
            return -ENXIO;
      control_fb = p;   /* save it for cleanups */

      /* Map in frame buffer and registers */
      p->fb_orig_base = fb_res.start;
      p->fb_orig_size = fb_res.end - fb_res.start + 1;
      /* use the big-endian aperture (??) */
      p->frame_buffer_phys = fb_res.start + 0x800000;
      p->control_regs_phys = reg_res.start;
      p->control_regs_size = reg_res.end - reg_res.start + 1;

      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);
}



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