Commit | Line | Data |
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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 | ||
af690a94 RB |
33 | #include <asm/io.h> |
34 | #include <asm/system.h> | |
35 | ||
1da177e4 | 36 | #include <asm/dec/tc.h> |
af690a94 | 37 | |
1da177e4 LT |
38 | #include <video/pmag-ba-fb.h> |
39 | ||
af690a94 RB |
40 | |
41 | struct pmagbafb_par { | |
42 | struct fb_info *next; | |
43 | volatile void __iomem *mmio; | |
44 | volatile u32 __iomem *dac; | |
45 | int slot; | |
1da177e4 LT |
46 | }; |
47 | ||
1da177e4 | 48 | |
af690a94 RB |
49 | static struct fb_info *root_pmagbafb_dev; |
50 | ||
51 | static struct fb_var_screeninfo pmagbafb_defined __initdata = { | |
1da177e4 LT |
52 | .xres = 1024, |
53 | .yres = 864, | |
54 | .xres_virtual = 1024, | |
55 | .yres_virtual = 864, | |
56 | .bits_per_pixel = 8, | |
57 | .red.length = 8, | |
58 | .green.length = 8, | |
59 | .blue.length = 8, | |
60 | .activate = FB_ACTIVATE_NOW, | |
af690a94 RB |
61 | .height = -1, |
62 | .width = -1, | |
63 | .accel_flags = FB_ACCEL_NONE, | |
64 | .pixclock = 14452, | |
65 | .left_margin = 116, | |
66 | .right_margin = 12, | |
67 | .upper_margin = 34, | |
68 | .lower_margin = 12, | |
69 | .hsync_len = 128, | |
70 | .vsync_len = 3, | |
71 | .sync = FB_SYNC_ON_GREEN, | |
1da177e4 LT |
72 | .vmode = FB_VMODE_NONINTERLACED, |
73 | }; | |
74 | ||
af690a94 | 75 | static struct fb_fix_screeninfo pmagbafb_fix __initdata = { |
1da177e4 | 76 | .id = "PMAG-BA", |
af690a94 | 77 | .smem_len = (1024 * 1024), |
1da177e4 LT |
78 | .type = FB_TYPE_PACKED_PIXELS, |
79 | .visual = FB_VISUAL_PSEUDOCOLOR, | |
80 | .line_length = 1024, | |
af690a94 | 81 | .mmio_len = PMAG_BA_SIZE - PMAG_BA_BT459, |
1da177e4 LT |
82 | }; |
83 | ||
af690a94 RB |
84 | |
85 | static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v) | |
1da177e4 | 86 | { |
af690a94 | 87 | writeb(v, par->dac + reg / 4); |
1da177e4 LT |
88 | } |
89 | ||
af690a94 RB |
90 | static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg) |
91 | { | |
92 | return readb(par->dac + reg / 4); | |
93 | } | |
94 | ||
95 | ||
1da177e4 | 96 | /* |
af690a94 | 97 | * Set the palette. |
1da177e4 | 98 | */ |
af690a94 RB |
99 | static int pmagbafb_setcolreg(unsigned int regno, unsigned int red, |
100 | unsigned int green, unsigned int blue, | |
101 | unsigned int transp, struct fb_info *info) | |
1da177e4 | 102 | { |
af690a94 | 103 | struct pmagbafb_par *par = info->par; |
1da177e4 | 104 | |
af690a94 | 105 | BUG_ON(regno >= info->cmap.len); |
1da177e4 LT |
106 | |
107 | red >>= 8; /* The cmap fields are 16 bits */ | |
af690a94 | 108 | green >>= 8; /* wide, but the hardware colormap */ |
1da177e4 LT |
109 | blue >>= 8; /* registers are only 8 bits wide */ |
110 | ||
af690a94 RB |
111 | mb(); |
112 | dac_write(par, BT459_ADDR_LO, regno); | |
113 | dac_write(par, BT459_ADDR_HI, 0x00); | |
114 | wmb(); | |
115 | dac_write(par, BT459_CMAP, red); | |
116 | wmb(); | |
117 | dac_write(par, BT459_CMAP, green); | |
118 | wmb(); | |
119 | dac_write(par, BT459_CMAP, blue); | |
120 | ||
1da177e4 LT |
121 | return 0; |
122 | } | |
123 | ||
124 | static struct fb_ops pmagbafb_ops = { | |
125 | .owner = THIS_MODULE, | |
1da177e4 LT |
126 | .fb_setcolreg = pmagbafb_setcolreg, |
127 | .fb_fillrect = cfb_fillrect, | |
128 | .fb_copyarea = cfb_copyarea, | |
129 | .fb_imageblit = cfb_imageblit, | |
1da177e4 LT |
130 | }; |
131 | ||
af690a94 RB |
132 | |
133 | /* | |
134 | * Turn the hardware cursor off. | |
135 | */ | |
136 | static void __init pmagbafb_erase_cursor(struct fb_info *info) | |
137 | { | |
138 | struct pmagbafb_par *par = info->par; | |
139 | ||
140 | mb(); | |
141 | dac_write(par, BT459_ADDR_LO, 0x00); | |
142 | dac_write(par, BT459_ADDR_HI, 0x03); | |
143 | wmb(); | |
144 | dac_write(par, BT459_DATA, 0x00); | |
145 | } | |
146 | ||
147 | ||
148 | static int __init pmagbafb_init_one(int slot) | |
1da177e4 | 149 | { |
af690a94 RB |
150 | struct fb_info *info; |
151 | struct pmagbafb_par *par; | |
152 | unsigned long base_addr; | |
153 | ||
154 | info = framebuffer_alloc(sizeof(struct pmagbafb_par), NULL); | |
155 | if (!info) | |
156 | return -ENOMEM; | |
157 | ||
158 | par = info->par; | |
159 | par->slot = slot; | |
160 | claim_tc_card(par->slot); | |
161 | ||
162 | base_addr = get_tc_base_addr(par->slot); | |
163 | ||
164 | par->next = root_pmagbafb_dev; | |
165 | root_pmagbafb_dev = info; | |
166 | ||
167 | if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) | |
168 | goto err_alloc; | |
169 | ||
1da177e4 | 170 | info->fbops = &pmagbafb_ops; |
af690a94 | 171 | info->fix = pmagbafb_fix; |
1da177e4 | 172 | info->var = pmagbafb_defined; |
1da177e4 LT |
173 | info->flags = FBINFO_DEFAULT; |
174 | ||
af690a94 RB |
175 | /* MMIO mapping setup. */ |
176 | info->fix.mmio_start = base_addr; | |
177 | par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len); | |
178 | if (!par->mmio) | |
179 | goto err_cmap; | |
180 | par->dac = par->mmio + PMAG_BA_BT459; | |
181 | ||
182 | /* Frame buffer mapping setup. */ | |
183 | info->fix.smem_start = base_addr + PMAG_BA_FBMEM; | |
184 | info->screen_base = ioremap_nocache(info->fix.smem_start, | |
185 | info->fix.smem_len); | |
186 | if (!info->screen_base) | |
187 | goto err_mmio_map; | |
188 | info->screen_size = info->fix.smem_len; | |
189 | ||
190 | pmagbafb_erase_cursor(info); | |
1da177e4 LT |
191 | |
192 | if (register_framebuffer(info) < 0) | |
af690a94 RB |
193 | goto err_smem_map; |
194 | ||
195 | pr_info("fb%d: %s frame buffer device in slot %d\n", | |
196 | info->node, info->fix.id, par->slot); | |
197 | ||
1da177e4 | 198 | return 0; |
af690a94 RB |
199 | |
200 | ||
201 | err_smem_map: | |
202 | iounmap(info->screen_base); | |
203 | ||
204 | err_mmio_map: | |
205 | iounmap(par->mmio); | |
206 | ||
207 | err_cmap: | |
208 | fb_dealloc_cmap(&info->cmap); | |
209 | ||
210 | err_alloc: | |
211 | root_pmagbafb_dev = par->next; | |
212 | release_tc_card(par->slot); | |
213 | framebuffer_release(info); | |
214 | return -ENXIO; | |
1da177e4 LT |
215 | } |
216 | ||
af690a94 RB |
217 | static void __exit pmagbafb_exit_one(void) |
218 | { | |
219 | struct fb_info *info = root_pmagbafb_dev; | |
220 | struct pmagbafb_par *par = info->par; | |
1da177e4 | 221 | |
af690a94 RB |
222 | unregister_framebuffer(info); |
223 | iounmap(info->screen_base); | |
224 | iounmap(par->mmio); | |
225 | fb_dealloc_cmap(&info->cmap); | |
226 | root_pmagbafb_dev = par->next; | |
227 | release_tc_card(par->slot); | |
228 | framebuffer_release(info); | |
229 | } | |
230 | ||
231 | ||
232 | /* | |
233 | * Initialise the framebuffer. | |
234 | */ | |
235 | static int __init pmagbafb_init(void) | |
1da177e4 | 236 | { |
af690a94 RB |
237 | int count = 0; |
238 | int slot; | |
1da177e4 LT |
239 | |
240 | if (fb_get_options("pmagbafb", NULL)) | |
af690a94 RB |
241 | return -ENXIO; |
242 | ||
243 | while ((slot = search_tc_card("PMAG-BA")) >= 0) { | |
244 | if (pmagbafb_init_one(slot) < 0) | |
245 | break; | |
246 | count++; | |
1da177e4 | 247 | } |
af690a94 | 248 | return (count > 0) ? 0 : -ENXIO; |
1da177e4 LT |
249 | } |
250 | ||
af690a94 RB |
251 | static void __exit pmagbafb_exit(void) |
252 | { | |
253 | while (root_pmagbafb_dev) | |
254 | pmagbafb_exit_one(); | |
255 | } | |
256 | ||
257 | ||
1da177e4 | 258 | module_init(pmagbafb_init); |
af690a94 RB |
259 | module_exit(pmagbafb_exit); |
260 | ||
1da177e4 | 261 | MODULE_LICENSE("GPL"); |