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 __devinitdata = {
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 __devinitdata = {
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
dac_write(struct pmagbafb_par * par,unsigned int reg,u8 v)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
dac_read(struct pmagbafb_par * par,unsigned int reg)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 */
pmagbafb_setcolreg(unsigned int regno,unsigned int red,unsigned int green,unsigned int blue,unsigned int transp,struct fb_info * info)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 if (regno >= info->cmap.len)
102 return 1;
103
104 red >>= 8; /* The cmap fields are 16 bits */
105 green >>= 8; /* wide, but the hardware colormap */
106 blue >>= 8; /* registers are only 8 bits wide */
107
108 mb();
109 dac_write(par, BT459_ADDR_LO, regno);
110 dac_write(par, BT459_ADDR_HI, 0x00);
111 wmb();
112 dac_write(par, BT459_CMAP, red);
113 wmb();
114 dac_write(par, BT459_CMAP, green);
115 wmb();
116 dac_write(par, BT459_CMAP, blue);
117
118 return 0;
119 }
120
121 static struct fb_ops pmagbafb_ops = {
122 .owner = THIS_MODULE,
123 .fb_setcolreg = pmagbafb_setcolreg,
124 .fb_fillrect = cfb_fillrect,
125 .fb_copyarea = cfb_copyarea,
126 .fb_imageblit = cfb_imageblit,
127 };
128
129
130 /*
131 * Turn the hardware cursor off.
132 */
pmagbafb_erase_cursor(struct fb_info * info)133 static void __init pmagbafb_erase_cursor(struct fb_info *info)
134 {
135 struct pmagbafb_par *par = info->par;
136
137 mb();
138 dac_write(par, BT459_ADDR_LO, 0x00);
139 dac_write(par, BT459_ADDR_HI, 0x03);
140 wmb();
141 dac_write(par, BT459_DATA, 0x00);
142 }
143
144
pmagbafb_probe(struct device * dev)145 static int __devinit pmagbafb_probe(struct device *dev)
146 {
147 struct tc_dev *tdev = to_tc_dev(dev);
148 resource_size_t start, len;
149 struct fb_info *info;
150 struct pmagbafb_par *par;
151 int err;
152
153 info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
154 if (!info) {
155 printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev));
156 return -ENOMEM;
157 }
158
159 par = info->par;
160 dev_set_drvdata(dev, info);
161
162 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
163 printk(KERN_ERR "%s: Cannot allocate color map\n",
164 dev_name(dev));
165 err = -ENOMEM;
166 goto err_alloc;
167 }
168
169 info->fbops = &pmagbafb_ops;
170 info->fix = pmagbafb_fix;
171 info->var = pmagbafb_defined;
172 info->flags = FBINFO_DEFAULT;
173
174 /* Request the I/O MEM resource. */
175 start = tdev->resource.start;
176 len = tdev->resource.end - start + 1;
177 if (!request_mem_region(start, len, dev_name(dev))) {
178 printk(KERN_ERR "%s: Cannot reserve FB region\n",
179 dev_name(dev));
180 err = -EBUSY;
181 goto err_cmap;
182 }
183
184 /* MMIO mapping setup. */
185 info->fix.mmio_start = start;
186 par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
187 if (!par->mmio) {
188 printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
189 err = -ENOMEM;
190 goto err_resource;
191 }
192 par->dac = par->mmio + PMAG_BA_BT459;
193
194 /* Frame buffer mapping setup. */
195 info->fix.smem_start = start + PMAG_BA_FBMEM;
196 info->screen_base = ioremap_nocache(info->fix.smem_start,
197 info->fix.smem_len);
198 if (!info->screen_base) {
199 printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
200 err = -ENOMEM;
201 goto err_mmio_map;
202 }
203 info->screen_size = info->fix.smem_len;
204
205 pmagbafb_erase_cursor(info);
206
207 err = register_framebuffer(info);
208 if (err < 0) {
209 printk(KERN_ERR "%s: Cannot register framebuffer\n",
210 dev_name(dev));
211 goto err_smem_map;
212 }
213
214 get_device(dev);
215
216 pr_info("fb%d: %s frame buffer device at %s\n",
217 info->node, info->fix.id, dev_name(dev));
218
219 return 0;
220
221
222 err_smem_map:
223 iounmap(info->screen_base);
224
225 err_mmio_map:
226 iounmap(par->mmio);
227
228 err_resource:
229 release_mem_region(start, len);
230
231 err_cmap:
232 fb_dealloc_cmap(&info->cmap);
233
234 err_alloc:
235 framebuffer_release(info);
236 return err;
237 }
238
pmagbafb_remove(struct device * dev)239 static int __exit pmagbafb_remove(struct device *dev)
240 {
241 struct tc_dev *tdev = to_tc_dev(dev);
242 struct fb_info *info = dev_get_drvdata(dev);
243 struct pmagbafb_par *par = info->par;
244 resource_size_t start, len;
245
246 put_device(dev);
247 unregister_framebuffer(info);
248 iounmap(info->screen_base);
249 iounmap(par->mmio);
250 start = tdev->resource.start;
251 len = tdev->resource.end - start + 1;
252 release_mem_region(start, len);
253 fb_dealloc_cmap(&info->cmap);
254 framebuffer_release(info);
255 return 0;
256 }
257
258
259 /*
260 * Initialize the framebuffer.
261 */
262 static const struct tc_device_id pmagbafb_tc_table[] = {
263 { "DEC ", "PMAG-BA " },
264 { }
265 };
266 MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);
267
268 static struct tc_driver pmagbafb_driver = {
269 .id_table = pmagbafb_tc_table,
270 .driver = {
271 .name = "pmagbafb",
272 .bus = &tc_bus_type,
273 .probe = pmagbafb_probe,
274 .remove = __exit_p(pmagbafb_remove),
275 },
276 };
277
pmagbafb_init(void)278 static int __init pmagbafb_init(void)
279 {
280 #ifndef MODULE
281 if (fb_get_options("pmagbafb", NULL))
282 return -ENXIO;
283 #endif
284 return tc_register_driver(&pmagbafb_driver);
285 }
286
pmagbafb_exit(void)287 static void __exit pmagbafb_exit(void)
288 {
289 tc_unregister_driver(&pmagbafb_driver);
290 }
291
292
293 module_init(pmagbafb_init);
294 module_exit(pmagbafb_exit);
295
296 MODULE_LICENSE("GPL");
297