1 /*
2 * linux/drivers/video/pmag-ba-fb.c
3 *
4 * PMAG-BA TURBOchannel Color Frame Buffer (CFB) card support,
5 * derived from:
6 * "HP300 Topcat framebuffer support (derived from macfb of all things)
7 * Phil Blundell <philb@gnu.org> 1998", the original code can be
8 * found in the file hpfb.c in the same directory.
9 *
10 * Based on digital document:
11 * "PMAG-BA TURBOchannel Color Frame Buffer
12 * Functional Specification", Revision 1.2, August 27, 1990
13 *
14 * DECstation related code Copyright (C) 1999, 2000, 2001 by
15 * Michael Engel <engel@unix-ag.org>,
16 * Karsten Merker <merker@linuxtag.org> and
17 * Harald Koerfgen.
18 * Copyright (c) 2005, 2006 Maciej W. Rozycki
19 * Copyright (c) 2005 James Simmons
20 *
21 * This file is subject to the terms and conditions of the GNU General
22 * Public License. See the file COPYING in the main directory of this
23 * archive for more details.
24 */
25
26 #include <linux/compiler.h>
27 #include <linux/errno.h>
28 #include <linux/fb.h>
29 #include <linux/init.h>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/tc.h>
33 #include <linux/types.h>
34
35 #include <asm/io.h>
36 #include <asm/system.h>
37
38 #include <video/pmag-ba-fb.h>
39
40
41 struct pmagbafb_par {
42 volatile void __iomem *mmio;
43 volatile u32 __iomem *dac;
44 };
45
46
47 static struct fb_var_screeninfo pmagbafb_defined __initdata = {
48 .xres = 1024,
49 .yres = 864,
50 .xres_virtual = 1024,
51 .yres_virtual = 864,
52 .bits_per_pixel = 8,
53 .red.length = 8,
54 .green.length = 8,
55 .blue.length = 8,
56 .activate = FB_ACTIVATE_NOW,
57 .height = -1,
58 .width = -1,
59 .accel_flags = FB_ACCEL_NONE,
60 .pixclock = 14452,
61 .left_margin = 116,
62 .right_margin = 12,
63 .upper_margin = 34,
64 .lower_margin = 12,
65 .hsync_len = 128,
66 .vsync_len = 3,
67 .sync = FB_SYNC_ON_GREEN,
68 .vmode = FB_VMODE_NONINTERLACED,
69 };
70
71 static struct fb_fix_screeninfo pmagbafb_fix __initdata = {
72 .id = "PMAG-BA",
73 .smem_len = (1024 * 1024),
74 .type = FB_TYPE_PACKED_PIXELS,
75 .visual = FB_VISUAL_PSEUDOCOLOR,
76 .line_length = 1024,
77 .mmio_len = PMAG_BA_SIZE - PMAG_BA_BT459,
78 };
79
80
81 static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
82 {
83 writeb(v, par->dac + reg / 4);
84 }
85
86 static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
87 {
88 return readb(par->dac + reg / 4);
89 }
90
91
92 /*
93 * Set the palette.
94 */
95 static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
96 unsigned int green, unsigned int blue,
97 unsigned int transp, struct fb_info *info)
98 {
99 struct pmagbafb_par *par = info->par;
100
101 BUG_ON(regno >= info->cmap.len);
102
103 red >>= 8; /* The cmap fields are 16 bits */
104 green >>= 8; /* wide, but the hardware colormap */
105 blue >>= 8; /* registers are only 8 bits wide */
106
107 mb();
108 dac_write(par, BT459_ADDR_LO, regno);
109 dac_write(par, BT459_ADDR_HI, 0x00);
110 wmb();
111 dac_write(par, BT459_CMAP, red);
112 wmb();
113 dac_write(par, BT459_CMAP, green);
114 wmb();
115 dac_write(par, BT459_CMAP, blue);
116
117 return 0;
118 }
119
120 static struct fb_ops pmagbafb_ops = {
121 .owner = THIS_MODULE,
122 .fb_setcolreg = pmagbafb_setcolreg,
123 .fb_fillrect = cfb_fillrect,
124 .fb_copyarea = cfb_copyarea,
125 .fb_imageblit = cfb_imageblit,
126 };
127
128
129 /*
130 * Turn the hardware cursor off.
131 */
132 static void __init pmagbafb_erase_cursor(struct fb_info *info)
133 {
134 struct pmagbafb_par *par = info->par;
135
136 mb();
137 dac_write(par, BT459_ADDR_LO, 0x00);
138 dac_write(par, BT459_ADDR_HI, 0x03);
139 wmb();
140 dac_write(par, BT459_DATA, 0x00);
141 }
142
143
144 static int __init pmagbafb_probe(struct device *dev)
145 {
146 struct tc_dev *tdev = to_tc_dev(dev);
147 resource_size_t start, len;
148 struct fb_info *info;
149 struct pmagbafb_par *par;
150 int err;
151
152 info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
153 if (!info) {
154 printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev));
155 return -ENOMEM;
156 }
157
158 par = info->par;
159 dev_set_drvdata(dev, info);
160
161 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
162 printk(KERN_ERR "%s: Cannot allocate color map\n",
163 dev_name(dev));
164 err = -ENOMEM;
165 goto err_alloc;
166 }
167
168 info->fbops = &pmagbafb_ops;
169 info->fix = pmagbafb_fix;
170 info->var = pmagbafb_defined;
171 info->flags = FBINFO_DEFAULT;
172
173 /* Request the I/O MEM resource. */
174 start = tdev->resource.start;
175 len = tdev->resource.end - start + 1;
176 if (!request_mem_region(start, len, dev_name(dev))) {
177 printk(KERN_ERR "%s: Cannot reserve FB region\n",
178 dev_name(dev));
179 err = -EBUSY;
180 goto err_cmap;
181 }
182
183 /* MMIO mapping setup. */
184 info->fix.mmio_start = start;
185 par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
186 if (!par->mmio) {
187 printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
188 err = -ENOMEM;
189 goto err_resource;
190 }
191 par->dac = par->mmio + PMAG_BA_BT459;
192
193 /* Frame buffer mapping setup. */
194 info->fix.smem_start = start + PMAG_BA_FBMEM;
195 info->screen_base = ioremap_nocache(info->fix.smem_start,
196 info->fix.smem_len);
197 if (!info->screen_base) {
198 printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
199 err = -ENOMEM;
200 goto err_mmio_map;
201 }
202 info->screen_size = info->fix.smem_len;
203
204 pmagbafb_erase_cursor(info);
205
206 err = register_framebuffer(info);
207 if (err < 0) {
208 printk(KERN_ERR "%s: Cannot register framebuffer\n",
209 dev_name(dev));
210 goto err_smem_map;
211 }
212
213 get_device(dev);
214
215 pr_info("fb%d: %s frame buffer device at %s\n",
216 info->node, info->fix.id, dev_name(dev));
217
218 return 0;
219
220
221 err_smem_map:
222 iounmap(info->screen_base);
223
224 err_mmio_map:
225 iounmap(par->mmio);
226
227 err_resource:
228 release_mem_region(start, len);
229
230 err_cmap:
231 fb_dealloc_cmap(&info->cmap);
232
233 err_alloc:
234 framebuffer_release(info);
235 return err;
236 }
237
238 static int __exit pmagbafb_remove(struct device *dev)
239 {
240 struct tc_dev *tdev = to_tc_dev(dev);
241 struct fb_info *info = dev_get_drvdata(dev);
242 struct pmagbafb_par *par = info->par;
243 resource_size_t start, len;
244
245 put_device(dev);
246 unregister_framebuffer(info);
247 iounmap(info->screen_base);
248 iounmap(par->mmio);
249 start = tdev->resource.start;
250 len = tdev->resource.end - start + 1;
251 release_mem_region(start, len);
252 fb_dealloc_cmap(&info->cmap);
253 framebuffer_release(info);
254 return 0;
255 }
256
257
258 /*
259 * Initialize the framebuffer.
260 */
261 static const struct tc_device_id pmagbafb_tc_table[] = {
262 { "DEC ", "PMAG-BA " },
263 { }
264 };
265 MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);
266
267 static struct tc_driver pmagbafb_driver = {
268 .id_table = pmagbafb_tc_table,
269 .driver = {
270 .name = "pmagbafb",
271 .bus = &tc_bus_type,
272 .probe = pmagbafb_probe,
273 .remove = __exit_p(pmagbafb_remove),
274 },
275 };
276
277 static int __init pmagbafb_init(void)
278 {
279 #ifndef MODULE
280 if (fb_get_options("pmagbafb", NULL))
281 return -ENXIO;
282 #endif
283 return tc_register_driver(&pmagbafb_driver);
284 }
285
286 static void __exit pmagbafb_exit(void)
287 {
288 tc_unregister_driver(&pmagbafb_driver);
289 }
290
291
292 module_init(pmagbafb_init);
293 module_exit(pmagbafb_exit);
294
295 MODULE_LICENSE("GPL");
296
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