summaryrefslogtreecommitdiffstats
path: root/drivers/video/fbdev/pmag-ba-fb.c
blob: 3b9249449ea613967f65912d86e9fb4f7644a5b8 (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
/*
 *	linux/drivers/video/pmag-ba-fb.c
 *
 *	PMAG-BA TURBOchannel Color Frame Buffer (CFB) card support,
 *	derived from:
 *	"HP300 Topcat framebuffer support (derived from macfb of all things)
 *	Phil Blundell <philb@gnu.org> 1998", the original code can be
 *	found in the file hpfb.c in the same directory.
 *
 *	Based on digital document:
 * 	"PMAG-BA TURBOchannel Color Frame Buffer
 *	 Functional Specification", Revision 1.2, August 27, 1990
 *
 *	DECstation related code Copyright (C) 1999, 2000, 2001 by
 *	Michael Engel <engel@unix-ag.org>,
 *	Karsten Merker <merker@linuxtag.org> and
 *	Harald Koerfgen.
 *	Copyright (c) 2005, 2006  Maciej W. Rozycki
 *	Copyright (c) 2005  James Simmons
 *
 *	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/compiler.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/tc.h>
#include <linux/types.h>

#include <asm/io.h>

#include <video/pmag-ba-fb.h>


struct pmagbafb_par {
	volatile void __iomem *mmio;
	volatile u32 __iomem *dac;
};


static const struct fb_var_screeninfo pmagbafb_defined = {
	.xres		= 1024,
	.yres		= 864,
	.xres_virtual	= 1024,
	.yres_virtual	= 864,
	.bits_per_pixel	= 8,
	.red.length	= 8,
	.green.length	= 8,
	.blue.length	= 8,
	.activate	= FB_ACTIVATE_NOW,
	.height		= -1,
	.width		= -1,
	.accel_flags	= FB_ACCEL_NONE,
	.pixclock	= 14452,
	.left_margin	= 116,
	.right_margin	= 12,
	.upper_margin	= 34,
	.lower_margin	= 0,
	.hsync_len	= 128,
	.vsync_len	= 3,
	.sync		= FB_SYNC_ON_GREEN,
	.vmode		= FB_VMODE_NONINTERLACED,
};

static const struct fb_fix_screeninfo pmagbafb_fix = {
	.id		= "PMAG-BA",
	.smem_len	= (1024 * 1024),
	.type		= FB_TYPE_PACKED_PIXELS,
	.visual		= FB_VISUAL_PSEUDOCOLOR,
	.line_length	= 1024,
	.mmio_len	= PMAG_BA_SIZE - PMAG_BA_BT459,
};


static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
{
	writeb(v, par->dac + reg / 4);
}

static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
{
	return readb(par->dac + reg / 4);
}


/*
 * Set the palette.
 */
static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
			      unsigned int green, unsigned int blue,
			      unsigned int transp, struct fb_info *info)
{
	struct pmagbafb_par *par = info->par;

	if (regno >= info->cmap.len)
		return 1;

	red   >>= 8;	/* The cmap fields are 16 bits    */
	green >>= 8;	/* wide, but the hardware colormap */
	blue  >>= 8;	/* registers are only 8 bits wide */

	mb();
	dac_write(par, BT459_ADDR_LO, regno);
	dac_write(par, BT459_ADDR_HI, 0x00);
	wmb();
	dac_write(par, BT459_CMAP, red);
	wmb();
	dac_write(par, BT459_CMAP, green);
	wmb();
	dac_write(par, BT459_CMAP, blue);

	return 0;
}

static struct fb_ops pmagbafb_ops = {
	.owner		= THIS_MODULE,
	.fb_setcolreg	= pmagbafb_setcolreg,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
};


/*
 * Turn the hardware cursor off.
 */
static void pmagbafb_erase_cursor(struct fb_info *info)
{
	struct pmagbafb_par *par = info->par;

	mb();
	dac_write(par, BT459_ADDR_LO, 0x00);
	dac_write(par, BT459_ADDR_HI, 0x03);
	wmb();
	dac_write(par, BT459_DATA, 0x00);
}


static int pmagbafb_probe(struct device *dev)
{
	struct tc_dev *tdev = to_tc_dev(dev);
	resource_size_t start, len;
	struct fb_info *info;
	struct pmagbafb_par *par;
	int err;

	info = framebuffer_alloc(sizeof(struct pmagbafb_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);

	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
		printk(KERN_ERR "%s: Cannot allocate color map\n",
		       dev_name(dev));
		err = -ENOMEM;
		goto err_alloc;
	}

	info->fbops = &pmagbafb_ops;
	info->fix = pmagbafb_fix;
	info->var = pmagbafb_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_cmap;
	}

	/* MMIO mapping setup.  */
	info->fix.mmio_start = start;
	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->dac = par->mmio + PMAG_BA_BT459;

	/* Frame buffer mapping setup.  */
	info->fix.smem_start = start + PMAG_BA_FBMEM;
	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;

	pmagbafb_erase_cursor(info);

	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);

	fb_info(info, "%s frame buffer device at %s\n",
		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_cmap:
	fb_dealloc_cmap(&info->cmap);

err_alloc:
	framebuffer_release(info);
	return err;
}

static int pmagbafb_remove(struct device *dev)
{
	struct tc_dev *tdev = to_tc_dev(dev);
	struct fb_info *info = dev_get_drvdata(dev);
	struct pmagbafb_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);
	fb_dealloc_cmap(&info->cmap);
	framebuffer_release(info);
	return 0;
}


/*
 * Initialize the framebuffer.
 */
static const struct tc_device_id pmagbafb_tc_table[] = {
	{ "DEC     ", "PMAG-BA " },
	{ }
};
MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);

static struct tc_driver pmagbafb_driver = {
	.id_table	= pmagbafb_tc_table,
	.driver		= {
		.name	= "pmagbafb",
		.bus	= &tc_bus_type,
		.probe	= pmagbafb_probe,
		.remove	= pmagbafb_remove,
	},
};

static int __init pmagbafb_init(void)
{
#ifndef MODULE
	if (fb_get_options("pmagbafb", NULL))
		return -ENXIO;
#endif
	return tc_register_driver(&pmagbafb_driver);
}

static void __exit pmagbafb_exit(void)
{
	tc_unregister_driver(&pmagbafb_driver);
}


module_init(pmagbafb_init);
module_exit(pmagbafb_exit);

MODULE_LICENSE("GPL");