text: /*
   *	linux/drivers/video/pmag-aa-fb.c
   *	Copyright 2002 Karsten Merker <merker@debian.org>
   *
   *	PMAG-AA TurboChannel framebuffer card support ... derived from
   *	pmag-ba-fb.c, which is Copyright (C) 1999, 2000, 2001 by
   *	Michael Engel <engel@unix-ag.org>, Karsten Merker <merker@debian.org>
   *	and Harald Koerfgen <hkoerfg@web.de>, which itself is derived from
   *	"HP300 Topcat framebuffer support (derived from macfb of all things)
   *	Phil Blundell <philb@gnu.org> 1998"
   *	Copyright (c) 2016  Maciej W. Rozycki
   *
   *	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.
   *
   *	2002-09-28  Karsten Merker <merker@linuxtag.org>
   *		Version 0.01: First try to get a PMAG-AA running.
   *
   *	2003-02-24  Thiemo Seufer  <seufer@csv.ica.uni-stuttgart.de>
   *		Version 0.02: Major code cleanup.
   *
   *	2003-09-21  Thiemo Seufer  <seufer@csv.ica.uni-stuttgart.de>
   *		Hardware cursor support.
   *
   *	2016-02-21  Maciej W. Rozycki  <macro@linux-mips.org>
   *		Version 0.03: Rewritten for the new FB and TC APIs.
   */
  
  #include <linux/compiler.h>
  #include <linux/errno.h>
  #include <linux/fb.h>
  #include <linux/init.h>
  #include <linux/io.h>
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/tc.h>
  #include <linux/timer.h>
  
  #include "bt455.h"
  #include "bt431.h"
  
  /* Version information */
  #define DRIVER_VERSION "0.03"
  #define DRIVER_AUTHOR "Karsten Merker <merker@linuxtag.org>"
  #define DRIVER_DESCRIPTION "PMAG-AA Framebuffer Driver"
  
  /*
   * Bt455 RAM DAC register base offset (rel. to TC slot base address).
   */
  #define PMAG_AA_BT455_OFFSET		0x100000
  
  /*
   * Bt431 cursor generator offset (rel. to TC slot base address).
   */
  #define PMAG_AA_BT431_OFFSET		0x180000
  
  /*
   * Begin of PMAG-AA framebuffer memory relative to TC slot address,
   * resolution is 1280x1024x1 (8 bits deep, but only LSB is used).
   */
  #define PMAG_AA_ONBOARD_FBMEM_OFFSET	0x200000
  
  struct aafb_par {
  	void __iomem *mmio;
  	struct bt455_regs __iomem *bt455;
  	struct bt431_regs __iomem *bt431;
  };
  
  static const struct fb_var_screeninfo aafb_defined = {
  	.xres		= 1280,
  	.yres		= 1024,
  	.xres_virtual	= 2048,
  	.yres_virtual	= 1024,
  	.bits_per_pixel	= 8,
  	.grayscale	= 1,
  	.red.length	= 0,
  	.green.length	= 1,
  	.blue.length	= 0,
  	.activate	= FB_ACTIVATE_NOW,
  	.accel_flags	= FB_ACCEL_NONE,
  	.pixclock	= 7645,
  	.left_margin	= 224,
  	.right_margin	= 32,
  	.upper_margin	= 33,
  	.lower_margin	= 3,
  	.hsync_len	= 160,
  	.vsync_len	= 3,
  	.sync		= FB_SYNC_ON_GREEN,
  	.vmode		= FB_VMODE_NONINTERLACED,
  };
  
  static const struct fb_fix_screeninfo aafb_fix = {
  	.id		= "PMAG-AA",
  	.smem_len	= (2048 * 1024),
  	.type		= FB_TYPE_PACKED_PIXELS,
  	.visual		= FB_VISUAL_MONO10,
  	.ypanstep	= 1,
  	.ywrapstep	= 1,
  	.line_length	= 2048,
  	.mmio_len	= PMAG_AA_ONBOARD_FBMEM_OFFSET - PMAG_AA_BT455_OFFSET,
  };
  
  static int aafb_cursor(struct fb_info *info, struct fb_cursor *cursor)
  {
  	struct aafb_par *par = info->par;
  
  	if (cursor->image.height > BT431_CURSOR_SIZE ||
  	    cursor->image.width > BT431_CURSOR_SIZE) {
  		bt431_erase_cursor(par->bt431);
  		return -EINVAL;
  	}
  
  	if (!cursor->enable)
  		bt431_erase_cursor(par->bt431);
  
  	if (cursor->set & FB_CUR_SETPOS)
  		bt431_position_cursor(par->bt431,
  				      cursor->image.dx, cursor->image.dy);
  	if (cursor->set & FB_CUR_SETCMAP) {
  		u8 fg = cursor->image.fg_color ? 0xf : 0x0;
  		u8 bg = cursor->image.bg_color ? 0xf : 0x0;
  
  		bt455_write_cmap_entry(par->bt455, 8, bg);
  		bt455_write_cmap_next(par->bt455, bg);
  		bt455_write_ovly_next(par->bt455, fg);
  	}
  	if (cursor->set & (FB_CUR_SETSIZE | FB_CUR_SETSHAPE | FB_CUR_SETIMAGE))
  		bt431_set_cursor(par->bt431,
  				 cursor->image.data, cursor->mask, cursor->rop,
  				 cursor->image.width, cursor->image.height);
  
  	if (cursor->enable)
  		bt431_enable_cursor(par->bt431);
  
  	return 0;
  }
  
  /* 0 unblanks, any other blanks. */
  
  static int aafb_blank(int blank, struct fb_info *info)
  {
  	struct aafb_par *par = info->par;
  	u8 val = blank ? 0x00 : 0x0f;
  
  	bt455_write_cmap_entry(par->bt455, 1, val);
  	return 0;
  }
  
  static struct fb_ops aafb_ops = {
  	.owner		= THIS_MODULE,
  	.fb_blank	= aafb_blank,
  	.fb_fillrect	= cfb_fillrect,
  	.fb_copyarea	= cfb_copyarea,
  	.fb_imageblit	= cfb_imageblit,
  	.fb_cursor	= aafb_cursor,
  };
  
  static int pmagaafb_probe(struct device *dev)
  {
  	struct tc_dev *tdev = to_tc_dev(dev);
  	resource_size_t start, len;
  	struct fb_info *info;
  	struct aafb_par *par;
  	int err;
  
  	info = framebuffer_alloc(sizeof(struct aafb_par), dev);
  	if (!info)
  		return -ENOMEM;
  
  	par = info->par;
  	dev_set_drvdata(dev, info);
  
  	info->fbops = &aafb_ops;
  	info->fix = aafb_fix;
  	info->var = aafb_defined;
  	info->flags = FBINFO_DEFAULT;
  
  	/* Request the I/O MEM resource. */
  	start = tdev->resource.start;
  	len = tdev->resource.end - start + 1;
  	if (!request_mem_region(start, len, dev_name(dev))) {
  		printk(KERN_ERR "%s: Cannot reserve FB region\n",
  		       dev_name(dev));
  		err = -EBUSY;
  		goto err_alloc;
  	}
  
  	/* MMIO mapping setup. */
  	info->fix.mmio_start = start + PMAG_AA_BT455_OFFSET;
  	par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
  	if (!par->mmio) {
  		printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
  		err = -ENOMEM;
  		goto err_resource;
  	}
  	par->bt455 = par->mmio - PMAG_AA_BT455_OFFSET + PMAG_AA_BT455_OFFSET;
  	par->bt431 = par->mmio - PMAG_AA_BT455_OFFSET + PMAG_AA_BT431_OFFSET;
  
  	/* Frame buffer mapping setup. */
  	info->fix.smem_start = start + PMAG_AA_ONBOARD_FBMEM_OFFSET;
  	info->screen_base = ioremap_nocache(info->fix.smem_start,
  					    info->fix.smem_len);
  	if (!info->screen_base) {
  		printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
  		err = -ENOMEM;
  		goto err_mmio_map;
  	}
  	info->screen_size = info->fix.smem_len;
  
  	/* Init colormap. */
  	bt455_write_cmap_entry(par->bt455, 0, 0x0);
  	bt455_write_cmap_next(par->bt455, 0xf);
  
  	/* Init hardware cursor. */
  	bt431_erase_cursor(par->bt431);
  	bt431_init_cursor(par->bt431);
  
  	err = register_framebuffer(info);
  	if (err < 0) {
  		printk(KERN_ERR "%s: Cannot register framebuffer\n",
  		       dev_name(dev));
  		goto err_smem_map;
  	}
  
  	get_device(dev);
  
  	pr_info("fb%d: %s frame buffer device at %s\n",
  		info->node, info->fix.id, dev_name(dev));
  
  	return 0;
  
  
  err_smem_map:
  	iounmap(info->screen_base);
  
  err_mmio_map:
  	iounmap(par->mmio);
  
  err_resource:
  	release_mem_region(start, len);
  
  err_alloc:
  	framebuffer_release(info);
  	return err;
  }
  
  static int pmagaafb_remove(struct device *dev)
  {
  	struct tc_dev *tdev = to_tc_dev(dev);
  	struct fb_info *info = dev_get_drvdata(dev);
  	struct aafb_par *par = info->par;
  	resource_size_t start, len;
  
  	put_device(dev);
  	unregister_framebuffer(info);
  	iounmap(info->screen_base);
  	iounmap(par->mmio);
  	start = tdev->resource.start;
  	len = tdev->resource.end - start + 1;
  	release_mem_region(start, len);
  	framebuffer_release(info);
  	return 0;
  }
  
  /*
   * Initialise the framebuffer.
   */
  static const struct tc_device_id pmagaafb_tc_table[] = {
  	{ "DEC     ", "PMAG-AA " },
  	{ }
  };
  MODULE_DEVICE_TABLE(tc, pmagaafb_tc_table);
  
  static struct tc_driver pmagaafb_driver = {
  	.id_table	= pmagaafb_tc_table,
  	.driver		= {
  		.name	= "pmagaafb",
  		.bus	= &tc_bus_type,
  		.probe	= pmagaafb_probe,
  		.remove	= pmagaafb_remove,
  	},
  };
  
  static int __init pmagaafb_init(void)
  {
  #ifndef MODULE
  	if (fb_get_options("pmagaafb", NULL))
  		return -ENXIO;
  #endif
  	return tc_register_driver(&pmagaafb_driver);
  }
  
  static void __exit pmagaafb_exit(void)
  {
  	tc_unregister_driver(&pmagaafb_driver);
  }
  
  module_init(pmagaafb_init);
  module_exit(pmagaafb_exit);
  
  MODULE_AUTHOR(DRIVER_AUTHOR);
  MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
  MODULE_LICENSE("GPL");
  