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linux-next/drivers/video/fbdev/pmag-aa-fb.c
Bhumika Goyal a7582733ef video: fbdev: make fb_var_screeninfo const 
Make these const as they are not modified anywhere.

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
2017-09-04 16:00:50 +02:00

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7.5 KiB
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/*
* 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) {
printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev));
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");
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