1 /*
2 * linux/drivers/video/pmag-aa-fb.c
3 * Copyright 2002 Karsten Merker <merker@debian.org>
4 *
5 * PMAG-AA TurboChannel framebuffer card support ... derived from
6 * pmag-ba-fb.c, which is Copyright (C) 1999, 2000, 2001 by
7 * Michael Engel <engel@unix-ag.org>, Karsten Merker <merker@debian.org>
8 * and Harald Koerfgen <hkoerfg@web.de>, which itself is derived from
9 * "HP300 Topcat framebuffer support (derived from macfb of all things)
10 * Phil Blundell <philb@gnu.org> 1998"
11 * Copyright (c) 2016 Maciej W. Rozycki
12 *
13 * This file is subject to the terms and conditions of the GNU General
14 * Public License. See the file COPYING in the main directory of this
15 * archive for more details.
16 *
17 * 2002-09-28 Karsten Merker <merker@linuxtag.org>
18 * Version 0.01: First try to get a PMAG-AA running.
19 *
20 * 2003-02-24 Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de>
21 * Version 0.02: Major code cleanup.
22 *
23 * 2003-09-21 Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de>
24 * Hardware cursor support.
25 *
26 * 2016-02-21 Maciej W. Rozycki <macro@linux-mips.org>
27 * Version 0.03: Rewritten for the new FB and TC APIs.
28 */
29
30 #include <linux/compiler.h>
31 #include <linux/errno.h>
32 #include <linux/fb.h>
33 #include <linux/init.h>
34 #include <linux/io.h>
35 #include <linux/kernel.h>
36 #include <linux/module.h>
37 #include <linux/tc.h>
38 #include <linux/timer.h>
39
40 #include "bt455.h"
41 #include "bt431.h"
42
43 /* Version information */
44 #define DRIVER_VERSION "0.03"
45 #define DRIVER_AUTHOR "Karsten Merker <merker@linuxtag.org>"
46 #define DRIVER_DESCRIPTION "PMAG-AA Framebuffer Driver"
47
48 /*
49 * Bt455 RAM DAC register base offset (rel. to TC slot base address).
50 */
51 #define PMAG_AA_BT455_OFFSET 0x100000
52
53 /*
54 * Bt431 cursor generator offset (rel. to TC slot base address).
55 */
56 #define PMAG_AA_BT431_OFFSET 0x180000
57
58 /*
59 * Begin of PMAG-AA framebuffer memory relative to TC slot address,
60 * resolution is 1280x1024x1 (8 bits deep, but only LSB is used).
61 */
62 #define PMAG_AA_ONBOARD_FBMEM_OFFSET 0x200000
63
64 struct aafb_par {
65 void __iomem *mmio;
66 struct bt455_regs __iomem *bt455;
67 struct bt431_regs __iomem *bt431;
68 };
69
70 static const struct fb_var_screeninfo aafb_defined = {
71 .xres = 1280,
72 .yres = 1024,
73 .xres_virtual = 2048,
74 .yres_virtual = 1024,
75 .bits_per_pixel = 8,
76 .grayscale = 1,
77 .red.length = 0,
78 .green.length = 1,
79 .blue.length = 0,
80 .activate = FB_ACTIVATE_NOW,
81 .accel_flags = FB_ACCEL_NONE,
82 .pixclock = 7645,
83 .left_margin = 224,
84 .right_margin = 32,
85 .upper_margin = 33,
86 .lower_margin = 3,
87 .hsync_len = 160,
88 .vsync_len = 3,
89 .sync = FB_SYNC_ON_GREEN,
90 .vmode = FB_VMODE_NONINTERLACED,
91 };
92
93 static const struct fb_fix_screeninfo aafb_fix = {
94 .id = "PMAG-AA",
95 .smem_len = (2048 * 1024),
96 .type = FB_TYPE_PACKED_PIXELS,
97 .visual = FB_VISUAL_MONO10,
98 .ypanstep = 1,
99 .ywrapstep = 1,
100 .line_length = 2048,
101 .mmio_len = PMAG_AA_ONBOARD_FBMEM_OFFSET - PMAG_AA_BT455_OFFSET,
102 };
103
aafb_cursor(struct fb_info * info,struct fb_cursor * cursor)104 static int aafb_cursor(struct fb_info *info, struct fb_cursor *cursor)
105 {
106 struct aafb_par *par = info->par;
107
108 if (cursor->image.height > BT431_CURSOR_SIZE ||
109 cursor->image.width > BT431_CURSOR_SIZE) {
110 bt431_erase_cursor(par->bt431);
111 return -EINVAL;
112 }
113
114 if (!cursor->enable)
115 bt431_erase_cursor(par->bt431);
116
117 if (cursor->set & FB_CUR_SETPOS)
118 bt431_position_cursor(par->bt431,
119 cursor->image.dx, cursor->image.dy);
120 if (cursor->set & FB_CUR_SETCMAP) {
121 u8 fg = cursor->image.fg_color ? 0xf : 0x0;
122 u8 bg = cursor->image.bg_color ? 0xf : 0x0;
123
124 bt455_write_cmap_entry(par->bt455, 8, bg);
125 bt455_write_cmap_next(par->bt455, bg);
126 bt455_write_ovly_next(par->bt455, fg);
127 }
128 if (cursor->set & (FB_CUR_SETSIZE | FB_CUR_SETSHAPE | FB_CUR_SETIMAGE))
129 bt431_set_cursor(par->bt431,
130 cursor->image.data, cursor->mask, cursor->rop,
131 cursor->image.width, cursor->image.height);
132
133 if (cursor->enable)
134 bt431_enable_cursor(par->bt431);
135
136 return 0;
137 }
138
139 /* 0 unblanks, any other blanks. */
140
aafb_blank(int blank,struct fb_info * info)141 static int aafb_blank(int blank, struct fb_info *info)
142 {
143 struct aafb_par *par = info->par;
144 u8 val = blank ? 0x00 : 0x0f;
145
146 bt455_write_cmap_entry(par->bt455, 1, val);
147 return 0;
148 }
149
150 static const struct fb_ops aafb_ops = {
151 .owner = THIS_MODULE,
152 FB_DEFAULT_IOMEM_OPS,
153 .fb_blank = aafb_blank,
154 .fb_cursor = aafb_cursor,
155 };
156
pmagaafb_probe(struct device * dev)157 static int pmagaafb_probe(struct device *dev)
158 {
159 struct tc_dev *tdev = to_tc_dev(dev);
160 resource_size_t start, len;
161 struct fb_info *info;
162 struct aafb_par *par;
163 int err;
164
165 info = framebuffer_alloc(sizeof(struct aafb_par), dev);
166 if (!info)
167 return -ENOMEM;
168
169 par = info->par;
170 dev_set_drvdata(dev, info);
171
172 info->fbops = &aafb_ops;
173 info->fix = aafb_fix;
174 info->var = aafb_defined;
175
176 /* Request the I/O MEM resource. */
177 start = tdev->resource.start;
178 len = tdev->resource.end - start + 1;
179 if (!request_mem_region(start, len, dev_name(dev))) {
180 printk(KERN_ERR "%s: Cannot reserve FB region\n",
181 dev_name(dev));
182 err = -EBUSY;
183 goto err_alloc;
184 }
185
186 /* MMIO mapping setup. */
187 info->fix.mmio_start = start + PMAG_AA_BT455_OFFSET;
188 par->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
189 if (!par->mmio) {
190 printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
191 err = -ENOMEM;
192 goto err_resource;
193 }
194 par->bt455 = par->mmio - PMAG_AA_BT455_OFFSET + PMAG_AA_BT455_OFFSET;
195 par->bt431 = par->mmio - PMAG_AA_BT455_OFFSET + PMAG_AA_BT431_OFFSET;
196
197 /* Frame buffer mapping setup. */
198 info->fix.smem_start = start + PMAG_AA_ONBOARD_FBMEM_OFFSET;
199 info->screen_base = ioremap(info->fix.smem_start,
200 info->fix.smem_len);
201 if (!info->screen_base) {
202 printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
203 err = -ENOMEM;
204 goto err_mmio_map;
205 }
206 info->screen_size = info->fix.smem_len;
207
208 /* Init colormap. */
209 bt455_write_cmap_entry(par->bt455, 0, 0x0);
210 bt455_write_cmap_next(par->bt455, 0xf);
211
212 /* Init hardware cursor. */
213 bt431_erase_cursor(par->bt431);
214 bt431_init_cursor(par->bt431);
215
216 err = register_framebuffer(info);
217 if (err < 0) {
218 printk(KERN_ERR "%s: Cannot register framebuffer\n",
219 dev_name(dev));
220 goto err_smem_map;
221 }
222
223 get_device(dev);
224
225 pr_info("fb%d: %s frame buffer device at %s\n",
226 info->node, info->fix.id, dev_name(dev));
227
228 return 0;
229
230
231 err_smem_map:
232 iounmap(info->screen_base);
233
234 err_mmio_map:
235 iounmap(par->mmio);
236
237 err_resource:
238 release_mem_region(start, len);
239
240 err_alloc:
241 framebuffer_release(info);
242 return err;
243 }
244
pmagaafb_remove(struct device * dev)245 static int pmagaafb_remove(struct device *dev)
246 {
247 struct tc_dev *tdev = to_tc_dev(dev);
248 struct fb_info *info = dev_get_drvdata(dev);
249 struct aafb_par *par = info->par;
250 resource_size_t start, len;
251
252 put_device(dev);
253 unregister_framebuffer(info);
254 iounmap(info->screen_base);
255 iounmap(par->mmio);
256 start = tdev->resource.start;
257 len = tdev->resource.end - start + 1;
258 release_mem_region(start, len);
259 framebuffer_release(info);
260 return 0;
261 }
262
263 /*
264 * Initialise the framebuffer.
265 */
266 static const struct tc_device_id pmagaafb_tc_table[] = {
267 { "DEC ", "PMAG-AA " },
268 { }
269 };
270 MODULE_DEVICE_TABLE(tc, pmagaafb_tc_table);
271
272 static struct tc_driver pmagaafb_driver = {
273 .id_table = pmagaafb_tc_table,
274 .driver = {
275 .name = "pmagaafb",
276 .bus = &tc_bus_type,
277 .probe = pmagaafb_probe,
278 .remove = pmagaafb_remove,
279 },
280 };
281
pmagaafb_init(void)282 static int __init pmagaafb_init(void)
283 {
284 #ifndef MODULE
285 if (fb_get_options("pmagaafb", NULL))
286 return -ENXIO;
287 #endif
288 return tc_register_driver(&pmagaafb_driver);
289 }
290
pmagaafb_exit(void)291 static void __exit pmagaafb_exit(void)
292 {
293 tc_unregister_driver(&pmagaafb_driver);
294 }
295
296 module_init(pmagaafb_init);
297 module_exit(pmagaafb_exit);
298
299 MODULE_AUTHOR(DRIVER_AUTHOR);
300 MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
301 MODULE_LICENSE("GPL");
302