1/*
2 *      linux/drivers/video/maxinefb.c
3 *
4 *	DECstation 5000/xx onboard framebuffer support ... derived from:
5 *	"HP300 Topcat framebuffer support (derived from macfb of all things)
6 *	Phil Blundell <philb@gnu.org> 1998", the original code can be
7 *      found in the file hpfb.c in the same directory.
8 *
9 *      DECstation related code Copyright (C) 1999,2000,2001 by
10 *      Michael Engel <engel@unix-ag.org> and
11 *      Karsten Merker <merker@linuxtag.org>.
12 *      This file is subject to the terms and conditions of the GNU General
13 *      Public License.  See the file COPYING in the main directory of this
14 *      archive for more details.
15 *
16 */
17
18/*
19 * Changes:
20 * 2001/01/27 removed debugging and testing code, fixed fb_ops
21 *            initialization which had caused a crash before,
22 *            general cleanup, first official release (KM)
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/kernel.h>
28#include <linux/errno.h>
29#include <linux/string.h>
30#include <linux/mm.h>
31#include <linux/slab.h>
32#include <linux/delay.h>
33#include <linux/init.h>
34#include <linux/fb.h>
35#include <video/maxinefb.h>
36
37/* bootinfo.h defines the machine type values, needed when checking */
38/* whether are really running on a maxine, KM                       */
39#include <asm/bootinfo.h>
40
41static struct fb_info fb_info;
42
43static struct fb_var_screeninfo maxinefb_defined = {
44	.xres =		1024,
45	.yres =		768,
46	.xres_virtual =	1024,
47	.yres_virtual =	768,
48	.bits_per_pixel =8,
49	.activate =	FB_ACTIVATE_NOW,
50	.height =	-1,
51	.width =	-1,
52	.vmode =	FB_VMODE_NONINTERLACED,
53};
54
55static struct fb_fix_screeninfo maxinefb_fix = {
56	.id =		"Maxine",
57	.smem_len =	(1024*768),
58	.type =		FB_TYPE_PACKED_PIXELS,
59	.visual =	FB_VISUAL_PSEUDOCOLOR,
60	.line_length =	1024,
61};
62
63/* Handle the funny Inmos RamDAC/video controller ... */
64
65void maxinefb_ims332_write_register(int regno, register unsigned int val)
66{
67	register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
68	unsigned char *wptr;
69
70	wptr = regs + 0xa0000 + (regno << 4);
71	*((volatile unsigned int *) (regs)) = (val >> 8) & 0xff00;
72	*((volatile unsigned short *) (wptr)) = val;
73}
74
75unsigned int maxinefb_ims332_read_register(int regno)
76{
77	register unsigned char *regs = (char *) MAXINEFB_IMS332_ADDRESS;
78	unsigned char *rptr;
79	register unsigned int j, k;
80
81	rptr = regs + 0x80000 + (regno << 4);
82	j = *((volatile unsigned short *) rptr);
83	k = *((volatile unsigned short *) regs);
84
85	return (j & 0xffff) | ((k & 0xff00) << 8);
86}
87
88/* Set the palette */
89static int maxinefb_setcolreg(unsigned regno, unsigned red, unsigned green,
90			      unsigned blue, unsigned transp, struct fb_info *info)
91{
92	/* value to be written into the palette reg. */
93	unsigned long hw_colorvalue = 0;
94
95	red   >>= 8;    /* The cmap fields are 16 bits    */
96	green >>= 8;    /* wide, but the harware colormap */
97	blue  >>= 8;    /* registers are only 8 bits wide */
98
99	hw_colorvalue = (blue << 16) + (green << 8) + (red);
100
101	maxinefb_ims332_write_register(IMS332_REG_COLOR_PALETTE + regno,
102				       hw_colorvalue);
103	return 0;
104}
105
106static struct fb_ops maxinefb_ops = {
107	.owner		= THIS_MODULE,
108	.fb_setcolreg	= maxinefb_setcolreg,
109	.fb_fillrect	= cfb_fillrect,
110	.fb_copyarea	= cfb_copyarea,
111	.fb_imageblit	= cfb_imageblit,
112};
113
114int __init maxinefb_init(void)
115{
116	unsigned long fboff;
117	unsigned long fb_start;
118	int i;
119
120	if (fb_get_options("maxinefb", NULL))
121		return -ENODEV;
122
123	/* Validate we're on the proper machine type */
124	if (mips_machtype != MACH_DS5000_XX) {
125		return -EINVAL;
126	}
127
128	printk(KERN_INFO "Maxinefb: Personal DECstation detected\n");
129	printk(KERN_INFO "Maxinefb: initializing onboard framebuffer\n");
130
131	/* Framebuffer display memory base address */
132	fb_start = DS5000_xx_ONBOARD_FBMEM_START;
133
134	/* Clear screen */
135	for (fboff = fb_start; fboff < fb_start + 0x1ffff; fboff++)
136		*(volatile unsigned char *)fboff = 0x0;
137
138	maxinefb_fix.smem_start = fb_start;
139
140	/* erase hardware cursor */
141	for (i = 0; i < 512; i++) {
142		maxinefb_ims332_write_register(IMS332_REG_CURSOR_RAM + i,
143					       0);
144		/*
145		   if (i&0x8 == 0)
146		   maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0x0f);
147		   else
148		   maxinefb_ims332_write_register (IMS332_REG_CURSOR_RAM + i, 0xf0);
149		 */
150	}
151
152	fb_info.fbops = &maxinefb_ops;
153	fb_info.screen_base = (char *)maxinefb_fix.smem_start;
154	fb_info.var = maxinefb_defined;
155	fb_info.fix = maxinefb_fix;
156	fb_info.flags = FBINFO_DEFAULT;
157
158	fb_alloc_cmap(&fb_info.cmap, 256, 0);
159
160	if (register_framebuffer(&fb_info) < 0)
161		return 1;
162	return 0;
163}
164
165static void __exit maxinefb_exit(void)
166{
167	unregister_framebuffer(&fb_info);
168}
169
170#ifdef MODULE
171MODULE_LICENSE("GPL");
172#endif
173module_init(maxinefb_init);
174module_exit(maxinefb_exit);
175