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1da177e4 | 1 | /* |
af690a94 | 2 | * linux/drivers/video/pmag-ba-fb.c |
1da177e4 | 3 | * |
af690a94 RB |
4 | * PMAG-BA TURBOchannel Color Frame Buffer (CFB) card support, |
5 | * derived from: | |
1da177e4 LT |
6 | * "HP300 Topcat framebuffer support (derived from macfb of all things) |
7 | * Phil Blundell <philb@gnu.org> 1998", the original code can be | |
af690a94 | 8 | * found in the file hpfb.c in the same directory. |
1da177e4 LT |
9 | * |
10 | * Based on digital document: | |
11 | * "PMAG-BA TURBOchannel Color Frame Buffer | |
12 | * Functional Specification", Revision 1.2, August 27, 1990 | |
13 | * | |
af690a94 RB |
14 | * DECstation related code Copyright (C) 1999, 2000, 2001 by |
15 | * Michael Engel <engel@unix-ag.org>, | |
16 | * Karsten Merker <merker@linuxtag.org> and | |
1da177e4 | 17 | * Harald Koerfgen. |
af690a94 | 18 | * Copyright (c) 2005 Maciej W. Rozycki |
1da177e4 | 19 | * |
af690a94 RB |
20 | * This file is subject to the terms and conditions of the GNU General |
21 | * Public License. See the file COPYING in the main directory of this | |
22 | * archive for more details. | |
1da177e4 | 23 | */ |
af690a94 RB |
24 | |
25 | #include <linux/compiler.h> | |
1da177e4 | 26 | #include <linux/errno.h> |
1da177e4 | 27 | #include <linux/fb.h> |
af690a94 RB |
28 | #include <linux/init.h> |
29 | #include <linux/kernel.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/types.h> | |
32 | ||
33 | #include <asm/bug.h> | |
34 | #include <asm/io.h> | |
35 | #include <asm/system.h> | |
36 | ||
1da177e4 | 37 | #include <asm/dec/tc.h> |
af690a94 | 38 | |
1da177e4 LT |
39 | #include <video/pmag-ba-fb.h> |
40 | ||
af690a94 RB |
41 | |
42 | struct pmagbafb_par { | |
43 | struct fb_info *next; | |
44 | volatile void __iomem *mmio; | |
45 | volatile u32 __iomem *dac; | |
46 | int slot; | |
1da177e4 LT |
47 | }; |
48 | ||
1da177e4 | 49 | |
af690a94 RB |
50 | static struct fb_info *root_pmagbafb_dev; |
51 | ||
52 | static struct fb_var_screeninfo pmagbafb_defined __initdata = { | |
1da177e4 LT |
53 | .xres = 1024, |
54 | .yres = 864, | |
55 | .xres_virtual = 1024, | |
56 | .yres_virtual = 864, | |
57 | .bits_per_pixel = 8, | |
58 | .red.length = 8, | |
59 | .green.length = 8, | |
60 | .blue.length = 8, | |
61 | .activate = FB_ACTIVATE_NOW, | |
af690a94 RB |
62 | .height = -1, |
63 | .width = -1, | |
64 | .accel_flags = FB_ACCEL_NONE, | |
65 | .pixclock = 14452, | |
66 | .left_margin = 116, | |
67 | .right_margin = 12, | |
68 | .upper_margin = 34, | |
69 | .lower_margin = 12, | |
70 | .hsync_len = 128, | |
71 | .vsync_len = 3, | |
72 | .sync = FB_SYNC_ON_GREEN, | |
1da177e4 LT |
73 | .vmode = FB_VMODE_NONINTERLACED, |
74 | }; | |
75 | ||
af690a94 | 76 | static struct fb_fix_screeninfo pmagbafb_fix __initdata = { |
1da177e4 | 77 | .id = "PMAG-BA", |
af690a94 | 78 | .smem_len = (1024 * 1024), |
1da177e4 LT |
79 | .type = FB_TYPE_PACKED_PIXELS, |
80 | .visual = FB_VISUAL_PSEUDOCOLOR, | |
81 | .line_length = 1024, | |
af690a94 | 82 | .mmio_len = PMAG_BA_SIZE - PMAG_BA_BT459, |
1da177e4 LT |
83 | }; |
84 | ||
af690a94 RB |
85 | |
86 | static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v) | |
1da177e4 | 87 | { |
af690a94 | 88 | writeb(v, par->dac + reg / 4); |
1da177e4 LT |
89 | } |
90 | ||
af690a94 RB |
91 | static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg) |
92 | { | |
93 | return readb(par->dac + reg / 4); | |
94 | } | |
95 | ||
96 | ||
1da177e4 | 97 | /* |
af690a94 | 98 | * Set the palette. |
1da177e4 | 99 | */ |
af690a94 RB |
100 | static int pmagbafb_setcolreg(unsigned int regno, unsigned int red, |
101 | unsigned int green, unsigned int blue, | |
102 | unsigned int transp, struct fb_info *info) | |
1da177e4 | 103 | { |
af690a94 | 104 | struct pmagbafb_par *par = info->par; |
1da177e4 | 105 | |
af690a94 | 106 | BUG_ON(regno >= info->cmap.len); |
1da177e4 LT |
107 | |
108 | red >>= 8; /* The cmap fields are 16 bits */ | |
af690a94 | 109 | green >>= 8; /* wide, but the hardware colormap */ |
1da177e4 LT |
110 | blue >>= 8; /* registers are only 8 bits wide */ |
111 | ||
af690a94 RB |
112 | mb(); |
113 | dac_write(par, BT459_ADDR_LO, regno); | |
114 | dac_write(par, BT459_ADDR_HI, 0x00); | |
115 | wmb(); | |
116 | dac_write(par, BT459_CMAP, red); | |
117 | wmb(); | |
118 | dac_write(par, BT459_CMAP, green); | |
119 | wmb(); | |
120 | dac_write(par, BT459_CMAP, blue); | |
121 | ||
1da177e4 LT |
122 | return 0; |
123 | } | |
124 | ||
125 | static struct fb_ops pmagbafb_ops = { | |
126 | .owner = THIS_MODULE, | |
1da177e4 LT |
127 | .fb_setcolreg = pmagbafb_setcolreg, |
128 | .fb_fillrect = cfb_fillrect, | |
129 | .fb_copyarea = cfb_copyarea, | |
130 | .fb_imageblit = cfb_imageblit, | |
131 | .fb_cursor = soft_cursor, | |
132 | }; | |
133 | ||
af690a94 RB |
134 | |
135 | /* | |
136 | * Turn the hardware cursor off. | |
137 | */ | |
138 | static void __init pmagbafb_erase_cursor(struct fb_info *info) | |
139 | { | |
140 | struct pmagbafb_par *par = info->par; | |
141 | ||
142 | mb(); | |
143 | dac_write(par, BT459_ADDR_LO, 0x00); | |
144 | dac_write(par, BT459_ADDR_HI, 0x03); | |
145 | wmb(); | |
146 | dac_write(par, BT459_DATA, 0x00); | |
147 | } | |
148 | ||
149 | ||
150 | static int __init pmagbafb_init_one(int slot) | |
1da177e4 | 151 | { |
af690a94 RB |
152 | struct fb_info *info; |
153 | struct pmagbafb_par *par; | |
154 | unsigned long base_addr; | |
155 | ||
156 | info = framebuffer_alloc(sizeof(struct pmagbafb_par), NULL); | |
157 | if (!info) | |
158 | return -ENOMEM; | |
159 | ||
160 | par = info->par; | |
161 | par->slot = slot; | |
162 | claim_tc_card(par->slot); | |
163 | ||
164 | base_addr = get_tc_base_addr(par->slot); | |
165 | ||
166 | par->next = root_pmagbafb_dev; | |
167 | root_pmagbafb_dev = info; | |
168 | ||
169 | if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) | |
170 | goto err_alloc; | |
171 | ||
1da177e4 | 172 | info->fbops = &pmagbafb_ops; |
af690a94 | 173 | info->fix = pmagbafb_fix; |
1da177e4 | 174 | info->var = pmagbafb_defined; |
1da177e4 LT |
175 | info->flags = FBINFO_DEFAULT; |
176 | ||
af690a94 RB |
177 | /* MMIO mapping setup. */ |
178 | info->fix.mmio_start = base_addr; | |
179 | par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len); | |
180 | if (!par->mmio) | |
181 | goto err_cmap; | |
182 | par->dac = par->mmio + PMAG_BA_BT459; | |
183 | ||
184 | /* Frame buffer mapping setup. */ | |
185 | info->fix.smem_start = base_addr + PMAG_BA_FBMEM; | |
186 | info->screen_base = ioremap_nocache(info->fix.smem_start, | |
187 | info->fix.smem_len); | |
188 | if (!info->screen_base) | |
189 | goto err_mmio_map; | |
190 | info->screen_size = info->fix.smem_len; | |
191 | ||
192 | pmagbafb_erase_cursor(info); | |
1da177e4 LT |
193 | |
194 | if (register_framebuffer(info) < 0) | |
af690a94 RB |
195 | goto err_smem_map; |
196 | ||
197 | pr_info("fb%d: %s frame buffer device in slot %d\n", | |
198 | info->node, info->fix.id, par->slot); | |
199 | ||
1da177e4 | 200 | return 0; |
af690a94 RB |
201 | |
202 | ||
203 | err_smem_map: | |
204 | iounmap(info->screen_base); | |
205 | ||
206 | err_mmio_map: | |
207 | iounmap(par->mmio); | |
208 | ||
209 | err_cmap: | |
210 | fb_dealloc_cmap(&info->cmap); | |
211 | ||
212 | err_alloc: | |
213 | root_pmagbafb_dev = par->next; | |
214 | release_tc_card(par->slot); | |
215 | framebuffer_release(info); | |
216 | return -ENXIO; | |
1da177e4 LT |
217 | } |
218 | ||
af690a94 RB |
219 | static void __exit pmagbafb_exit_one(void) |
220 | { | |
221 | struct fb_info *info = root_pmagbafb_dev; | |
222 | struct pmagbafb_par *par = info->par; | |
1da177e4 | 223 | |
af690a94 RB |
224 | unregister_framebuffer(info); |
225 | iounmap(info->screen_base); | |
226 | iounmap(par->mmio); | |
227 | fb_dealloc_cmap(&info->cmap); | |
228 | root_pmagbafb_dev = par->next; | |
229 | release_tc_card(par->slot); | |
230 | framebuffer_release(info); | |
231 | } | |
232 | ||
233 | ||
234 | /* | |
235 | * Initialise the framebuffer. | |
236 | */ | |
237 | static int __init pmagbafb_init(void) | |
1da177e4 | 238 | { |
af690a94 RB |
239 | int count = 0; |
240 | int slot; | |
1da177e4 LT |
241 | |
242 | if (fb_get_options("pmagbafb", NULL)) | |
af690a94 RB |
243 | return -ENXIO; |
244 | ||
245 | while ((slot = search_tc_card("PMAG-BA")) >= 0) { | |
246 | if (pmagbafb_init_one(slot) < 0) | |
247 | break; | |
248 | count++; | |
1da177e4 | 249 | } |
af690a94 | 250 | return (count > 0) ? 0 : -ENXIO; |
1da177e4 LT |
251 | } |
252 | ||
af690a94 RB |
253 | static void __exit pmagbafb_exit(void) |
254 | { | |
255 | while (root_pmagbafb_dev) | |
256 | pmagbafb_exit_one(); | |
257 | } | |
258 | ||
259 | ||
1da177e4 | 260 | module_init(pmagbafb_init); |
af690a94 RB |
261 | module_exit(pmagbafb_exit); |
262 | ||
1da177e4 | 263 | MODULE_LICENSE("GPL"); |