summaryrefslogtreecommitdiff
path: root/drivers/video/fbdev/pmag-aa-fb.c
blob: d1e78ce3a9c2d255dad9a07b493a221e1c99eb54 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
/*
 *	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");