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
37 #include <video/pmag-ba-fb.h>
38
39
40 struct pmagbafb_par {
41 volatile void __iomem *mmio;
42 volatile u32 __iomem *dac;
43 };
44
45
46 static const struct fb_var_screeninfo pmagbafb_defined = {
47 .xres = 1024,
48 .yres = 864,
49 .xres_virtual = 1024,
50 .yres_virtual = 864,
51 .bits_per_pixel = 8,
52 .red.length = 8,
53 .green.length = 8,
54 .blue.length = 8,
55 .activate = FB_ACTIVATE_NOW,
56 .height = -1,
57 .width = -1,
58 .accel_flags = FB_ACCEL_NONE,
59 .pixclock = 14452,
60 .left_margin = 116,
61 .right_margin = 12,
62 .upper_margin = 34,
63 .lower_margin = 0,
64 .hsync_len = 128,
65 .vsync_len = 3,
66 .sync = FB_SYNC_ON_GREEN,
67 .vmode = FB_VMODE_NONINTERLACED,
68 };
69
70 static const struct fb_fix_screeninfo pmagbafb_fix = {
71 .id = "PMAG-BA",
72 .smem_len = (1024 * 1024),
73 .type = FB_TYPE_PACKED_PIXELS,
74 .visual = FB_VISUAL_PSEUDOCOLOR,
75 .line_length = 1024,
76 .mmio_len = PMAG_BA_SIZE - PMAG_BA_BT459,
77 };
78
79
dac_write(struct pmagbafb_par * par,unsigned int reg,u8 v)80 static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
81 {
82 writeb(v, par->dac + reg / 4);
83 }
84
dac_read(struct pmagbafb_par * par,unsigned int reg)85 static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
86 {
87 return readb(par->dac + reg / 4);
88 }
89
90
91 /*
92 * Set the palette.
93 */
pmagbafb_setcolreg(unsigned int regno,unsigned int red,unsigned int green,unsigned int blue,unsigned int transp,struct fb_info * info)94 static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
95 unsigned int green, unsigned int blue,
96 unsigned int transp, struct fb_info *info)
97 {
98 struct pmagbafb_par *par = info->par;
99
100 if (regno >= info->cmap.len)
101 return 1;
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 const struct fb_ops pmagbafb_ops = {
121 .owner = THIS_MODULE,
122 FB_DEFAULT_IOMEM_OPS,
123 .fb_setcolreg = pmagbafb_setcolreg,
124 };
125
126
127 /*
128 * Turn the hardware cursor off.
129 */
pmagbafb_erase_cursor(struct fb_info * info)130 static void pmagbafb_erase_cursor(struct fb_info *info)
131 {
132 struct pmagbafb_par *par = info->par;
133
134 mb();
135 dac_write(par, BT459_ADDR_LO, 0x00);
136 dac_write(par, BT459_ADDR_HI, 0x03);
137 wmb();
138 dac_write(par, BT459_DATA, 0x00);
139 }
140
141
pmagbafb_probe(struct device * dev)142 static int pmagbafb_probe(struct device *dev)
143 {
144 struct tc_dev *tdev = to_tc_dev(dev);
145 resource_size_t start, len;
146 struct fb_info *info;
147 struct pmagbafb_par *par;
148 int err;
149
150 info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
151 if (!info)
152 return -ENOMEM;
153
154 par = info->par;
155 dev_set_drvdata(dev, info);
156
157 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
158 printk(KERN_ERR "%s: Cannot allocate color map\n",
159 dev_name(dev));
160 err = -ENOMEM;
161 goto err_alloc;
162 }
163
164 info->fbops = &pmagbafb_ops;
165 info->fix = pmagbafb_fix;
166 info->var = pmagbafb_defined;
167
168 /* Request the I/O MEM resource. */
169 start = tdev->resource.start;
170 len = tdev->resource.end - start + 1;
171 if (!request_mem_region(start, len, dev_name(dev))) {
172 printk(KERN_ERR "%s: Cannot reserve FB region\n",
173 dev_name(dev));
174 err = -EBUSY;
175 goto err_cmap;
176 }
177
178 /* MMIO mapping setup. */
179 info->fix.mmio_start = start;
180 par->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
181 if (!par->mmio) {
182 printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
183 err = -ENOMEM;
184 goto err_resource;
185 }
186 par->dac = par->mmio + PMAG_BA_BT459;
187
188 /* Frame buffer mapping setup. */
189 info->fix.smem_start = start + PMAG_BA_FBMEM;
190 info->screen_base = ioremap(info->fix.smem_start,
191 info->fix.smem_len);
192 if (!info->screen_base) {
193 printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
194 err = -ENOMEM;
195 goto err_mmio_map;
196 }
197 info->screen_size = info->fix.smem_len;
198
199 pmagbafb_erase_cursor(info);
200
201 err = register_framebuffer(info);
202 if (err < 0) {
203 printk(KERN_ERR "%s: Cannot register framebuffer\n",
204 dev_name(dev));
205 goto err_smem_map;
206 }
207
208 get_device(dev);
209
210 fb_info(info, "%s frame buffer device at %s\n",
211 info->fix.id, dev_name(dev));
212
213 return 0;
214
215
216 err_smem_map:
217 iounmap(info->screen_base);
218
219 err_mmio_map:
220 iounmap(par->mmio);
221
222 err_resource:
223 release_mem_region(start, len);
224
225 err_cmap:
226 fb_dealloc_cmap(&info->cmap);
227
228 err_alloc:
229 framebuffer_release(info);
230 return err;
231 }
232
pmagbafb_remove(struct device * dev)233 static int pmagbafb_remove(struct device *dev)
234 {
235 struct tc_dev *tdev = to_tc_dev(dev);
236 struct fb_info *info = dev_get_drvdata(dev);
237 struct pmagbafb_par *par = info->par;
238 resource_size_t start, len;
239
240 put_device(dev);
241 unregister_framebuffer(info);
242 iounmap(info->screen_base);
243 iounmap(par->mmio);
244 start = tdev->resource.start;
245 len = tdev->resource.end - start + 1;
246 release_mem_region(start, len);
247 fb_dealloc_cmap(&info->cmap);
248 framebuffer_release(info);
249 return 0;
250 }
251
252
253 /*
254 * Initialize the framebuffer.
255 */
256 static const struct tc_device_id pmagbafb_tc_table[] = {
257 { "DEC ", "PMAG-BA " },
258 { }
259 };
260 MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);
261
262 static struct tc_driver pmagbafb_driver = {
263 .id_table = pmagbafb_tc_table,
264 .driver = {
265 .name = "pmagbafb",
266 .bus = &tc_bus_type,
267 .probe = pmagbafb_probe,
268 .remove = pmagbafb_remove,
269 },
270 };
271
pmagbafb_init(void)272 static int __init pmagbafb_init(void)
273 {
274 #ifndef MODULE
275 if (fb_get_options("pmagbafb", NULL))
276 return -ENXIO;
277 #endif
278 return tc_register_driver(&pmagbafb_driver);
279 }
280
pmagbafb_exit(void)281 static void __exit pmagbafb_exit(void)
282 {
283 tc_unregister_driver(&pmagbafb_driver);
284 }
285
286
287 module_init(pmagbafb_init);
288 module_exit(pmagbafb_exit);
289
290 MODULE_LICENSE("GPL");
291