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1da177e4 LT |
1 | /* |
2 | * linux/drivers/video/pmag-ba-fb.c | |
3 | * | |
4 | * PMAG-BA TurboChannel framebuffer card 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 | * Based on digital document: | |
10 | * "PMAG-BA TURBOchannel Color Frame Buffer | |
11 | * Functional Specification", Revision 1.2, August 27, 1990 | |
12 | * | |
13 | * DECstation related code Copyright (C) 1999, 2000, 2001 by | |
14 | * Michael Engel <engel@unix-ag.org>, | |
15 | * Karsten Merker <merker@linuxtag.org> and | |
16 | * Harald Koerfgen. | |
17 | * This file is subject to the terms and conditions of the GNU General | |
18 | * Public License. See the file COPYING in the main directory of this | |
19 | * archive for more details. | |
20 | * | |
21 | */ | |
22 | #include <linux/module.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/timer.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/tty.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/delay.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/fb.h> | |
34 | #include <asm/bootinfo.h> | |
35 | #include <asm/dec/machtype.h> | |
36 | #include <asm/dec/tc.h> | |
37 | #include <video/pmag-ba-fb.h> | |
38 | ||
39 | struct pmag_ba_ramdac_regs { | |
40 | unsigned char addr_low; | |
41 | unsigned char pad0[3]; | |
42 | unsigned char addr_hi; | |
43 | unsigned char pad1[3]; | |
44 | unsigned char data; | |
45 | unsigned char pad2[3]; | |
46 | unsigned char cmap; | |
47 | }; | |
48 | ||
49 | /* | |
50 | * Max 3 TURBOchannel slots -> max 3 PMAG-BA :) | |
51 | */ | |
52 | static struct fb_info pmagba_fb_info[3]; | |
53 | ||
54 | static struct fb_var_screeninfo pmagbafb_defined = { | |
55 | .xres = 1024, | |
56 | .yres = 864, | |
57 | .xres_virtual = 1024, | |
58 | .yres_virtual = 864, | |
59 | .bits_per_pixel = 8, | |
60 | .red.length = 8, | |
61 | .green.length = 8, | |
62 | .blue.length = 8, | |
63 | .activate = FB_ACTIVATE_NOW, | |
64 | .height = 274, | |
65 | .width = 195, | |
66 | .accel = FB_ACCEL_NONE, | |
67 | .vmode = FB_VMODE_NONINTERLACED, | |
68 | }; | |
69 | ||
70 | static struct fb_fix_screeninfo pmagbafb_fix = { | |
71 | .id = "PMAG-BA", | |
72 | .smem_len = (1024 * 864), | |
73 | .type = FB_TYPE_PACKED_PIXELS, | |
74 | .visual = FB_VISUAL_PSEUDOCOLOR, | |
75 | .line_length = 1024, | |
76 | }; | |
77 | ||
78 | /* | |
79 | * Turn hardware cursor off | |
80 | */ | |
81 | void pmagbafb_erase_cursor(struct pmag_ba_ramdac_regs *bt459_regs) | |
82 | { | |
83 | bt459_regs->addr_low = 0; | |
84 | bt459_regs->addr_hi = 3; | |
85 | bt459_regs->data = 0; | |
86 | } | |
87 | ||
88 | /* | |
89 | * Set the palette. | |
90 | */ | |
91 | static int pmagbafb_setcolreg(unsigned regno, unsigned red, unsigned green, | |
92 | unsigned blue, unsigned transp, | |
93 | struct fb_info *info) | |
94 | { | |
95 | struct pmag_ba_ramdac_regs *bt459_regs = (struct pmag_ba_ramdac_regs *) info->par; | |
96 | ||
97 | if (regno >= info->cmap.len) | |
98 | return 1; | |
99 | ||
100 | red >>= 8; /* The cmap fields are 16 bits */ | |
101 | green >>= 8; /* wide, but the harware colormap */ | |
102 | blue >>= 8; /* registers are only 8 bits wide */ | |
103 | ||
104 | bt459_regs->addr_low = (__u8) regno; | |
105 | bt459_regs->addr_hi = 0; | |
106 | bt459_regs->cmap = red; | |
107 | bt459_regs->cmap = green; | |
108 | bt459_regs->cmap = blue; | |
109 | return 0; | |
110 | } | |
111 | ||
112 | static struct fb_ops pmagbafb_ops = { | |
113 | .owner = THIS_MODULE, | |
114 | .fb_get_fix = gen_get_fix, | |
115 | .fb_get_var = gen_get_var, | |
116 | .fb_setcolreg = pmagbafb_setcolreg, | |
117 | .fb_fillrect = cfb_fillrect, | |
118 | .fb_copyarea = cfb_copyarea, | |
119 | .fb_imageblit = cfb_imageblit, | |
120 | .fb_cursor = soft_cursor, | |
121 | }; | |
122 | ||
123 | int __init pmagbafb_init_one(int slot) | |
124 | { | |
125 | unsigned long base_addr = get_tc_base_addr(slot); | |
126 | struct fb_info *info = &pmagba_fb_info[slot]; | |
127 | struct display *disp = &pmagba_disp[slot]; | |
128 | ||
129 | printk("PMAG-BA framebuffer in slot %d\n", slot); | |
130 | /* | |
131 | * Framebuffer display memory base address and friends | |
132 | */ | |
133 | pmagbafb_fix.smem_start = base_addr + PMAG_BA_ONBOARD_FBMEM_OFFSET; | |
134 | info->par = (base_addr + PMAG_BA_BT459_OFFSET); | |
135 | ||
136 | /* | |
137 | * Configure the Bt459 RAM DAC | |
138 | */ | |
139 | pmagbafb_erase_cursor((struct pmag_ba_ramdac_regs *) info->par); | |
140 | ||
141 | /* | |
142 | * Let there be consoles.. | |
143 | */ | |
144 | info->fbops = &pmagbafb_ops; | |
145 | info->var = pmagbafb_defined; | |
146 | info->fix = pmagbafb_fix; | |
147 | info->screen_base = pmagbafb_fix.smem_start; | |
148 | info->flags = FBINFO_DEFAULT; | |
149 | ||
150 | fb_alloc_cmap(&fb_info.cmap, 256, 0); | |
151 | ||
152 | if (register_framebuffer(info) < 0) | |
153 | return 1; | |
154 | return 0; | |
155 | } | |
156 | ||
157 | /* | |
158 | * Initialise the framebuffer | |
159 | */ | |
160 | ||
161 | int __init pmagbafb_init(void) | |
162 | { | |
163 | int sid; | |
164 | int found = 0; | |
165 | ||
166 | if (fb_get_options("pmagbafb", NULL)) | |
167 | return -ENODEV; | |
168 | ||
169 | if (TURBOCHANNEL) { | |
170 | while ((sid = search_tc_card("PMAG-BA")) >= 0) { | |
171 | found = 1; | |
172 | claim_tc_card(sid); | |
173 | pmagbafb_init_one(sid); | |
174 | } | |
175 | return found ? 0 : -ENODEV; | |
176 | } else { | |
177 | return -ENODEV; | |
178 | } | |
179 | } | |
180 | ||
181 | module_init(pmagbafb_init); | |
182 | MODULE_LICENSE("GPL"); |