1 // SPDX-License-Identifier: GPL-2.0-only
2 /* bw2.c: BWTWO frame buffer driver
3 *
4 * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
5 * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz)
6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
7 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
8 *
9 * Driver layout based loosely on tgafb.c, see that file for credits.
10 */
11
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/string.h>
16 #include <linux/delay.h>
17 #include <linux/init.h>
18 #include <linux/fb.h>
19 #include <linux/mm.h>
20 #include <linux/of_device.h>
21
22 #include <asm/io.h>
23 #include <asm/fbio.h>
24
25 #include "sbuslib.h"
26
27 /*
28 * Local functions.
29 */
30
31 static int bw2_blank(int, struct fb_info *);
32
33 static int bw2_mmap(struct fb_info *, struct vm_area_struct *);
34 static int bw2_ioctl(struct fb_info *, unsigned int, unsigned long);
35
36 /*
37 * Frame buffer operations
38 */
39
40 static const struct fb_ops bw2_ops = {
41 .owner = THIS_MODULE,
42 .fb_blank = bw2_blank,
43 .fb_fillrect = cfb_fillrect,
44 .fb_copyarea = cfb_copyarea,
45 .fb_imageblit = cfb_imageblit,
46 .fb_mmap = bw2_mmap,
47 .fb_ioctl = bw2_ioctl,
48 #ifdef CONFIG_COMPAT
49 .fb_compat_ioctl = sbusfb_compat_ioctl,
50 #endif
51 };
52
53 /* OBio addresses for the bwtwo registers */
54 #define BWTWO_REGISTER_OFFSET 0x400000
55
56 struct bt_regs {
57 u32 addr;
58 u32 color_map;
59 u32 control;
60 u32 cursor;
61 };
62
63 struct bw2_regs {
64 struct bt_regs cmap;
65 u8 control;
66 u8 status;
67 u8 cursor_start;
68 u8 cursor_end;
69 u8 h_blank_start;
70 u8 h_blank_end;
71 u8 h_sync_start;
72 u8 h_sync_end;
73 u8 comp_sync_end;
74 u8 v_blank_start_high;
75 u8 v_blank_start_low;
76 u8 v_blank_end;
77 u8 v_sync_start;
78 u8 v_sync_end;
79 u8 xfer_holdoff_start;
80 u8 xfer_holdoff_end;
81 };
82
83 /* Status Register Constants */
84 #define BWTWO_SR_RES_MASK 0x70
85 #define BWTWO_SR_1600_1280 0x50
86 #define BWTWO_SR_1152_900_76_A 0x40
87 #define BWTWO_SR_1152_900_76_B 0x60
88 #define BWTWO_SR_ID_MASK 0x0f
89 #define BWTWO_SR_ID_MONO 0x02
90 #define BWTWO_SR_ID_MONO_ECL 0x03
91 #define BWTWO_SR_ID_MSYNC 0x04
92 #define BWTWO_SR_ID_NOCONN 0x0a
93
94 /* Control Register Constants */
95 #define BWTWO_CTL_ENABLE_INTS 0x80
96 #define BWTWO_CTL_ENABLE_VIDEO 0x40
97 #define BWTWO_CTL_ENABLE_TIMING 0x20
98 #define BWTWO_CTL_ENABLE_CURCMP 0x10
99 #define BWTWO_CTL_XTAL_MASK 0x0C
100 #define BWTWO_CTL_DIVISOR_MASK 0x03
101
102 /* Status Register Constants */
103 #define BWTWO_STAT_PENDING_INT 0x80
104 #define BWTWO_STAT_MSENSE_MASK 0x70
105 #define BWTWO_STAT_ID_MASK 0x0f
106
107 struct bw2_par {
108 spinlock_t lock;
109 struct bw2_regs __iomem *regs;
110
111 u32 flags;
112 #define BW2_FLAG_BLANKED 0x00000001
113
114 unsigned long which_io;
115 };
116
117 /**
118 * bw2_blank - Optional function. Blanks the display.
119 * @blank_mode: the blank mode we want.
120 * @info: frame buffer structure that represents a single frame buffer
121 */
122 static int
bw2_blank(int blank,struct fb_info * info)123 bw2_blank(int blank, struct fb_info *info)
124 {
125 struct bw2_par *par = (struct bw2_par *) info->par;
126 struct bw2_regs __iomem *regs = par->regs;
127 unsigned long flags;
128 u8 val;
129
130 spin_lock_irqsave(&par->lock, flags);
131
132 switch (blank) {
133 case FB_BLANK_UNBLANK: /* Unblanking */
134 val = sbus_readb(®s->control);
135 val |= BWTWO_CTL_ENABLE_VIDEO;
136 sbus_writeb(val, ®s->control);
137 par->flags &= ~BW2_FLAG_BLANKED;
138 break;
139
140 case FB_BLANK_NORMAL: /* Normal blanking */
141 case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
142 case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
143 case FB_BLANK_POWERDOWN: /* Poweroff */
144 val = sbus_readb(®s->control);
145 val &= ~BWTWO_CTL_ENABLE_VIDEO;
146 sbus_writeb(val, ®s->control);
147 par->flags |= BW2_FLAG_BLANKED;
148 break;
149 }
150
151 spin_unlock_irqrestore(&par->lock, flags);
152
153 return 0;
154 }
155
156 static struct sbus_mmap_map bw2_mmap_map[] = {
157 {
158 .size = SBUS_MMAP_FBSIZE(1)
159 },
160 { .size = 0 }
161 };
162
bw2_mmap(struct fb_info * info,struct vm_area_struct * vma)163 static int bw2_mmap(struct fb_info *info, struct vm_area_struct *vma)
164 {
165 struct bw2_par *par = (struct bw2_par *)info->par;
166
167 return sbusfb_mmap_helper(bw2_mmap_map,
168 info->fix.smem_start, info->fix.smem_len,
169 par->which_io,
170 vma);
171 }
172
bw2_ioctl(struct fb_info * info,unsigned int cmd,unsigned long arg)173 static int bw2_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
174 {
175 return sbusfb_ioctl_helper(cmd, arg, info,
176 FBTYPE_SUN2BW, 1, info->fix.smem_len);
177 }
178
179 /*
180 * Initialisation
181 */
182
bw2_init_fix(struct fb_info * info,int linebytes)183 static void bw2_init_fix(struct fb_info *info, int linebytes)
184 {
185 strlcpy(info->fix.id, "bwtwo", sizeof(info->fix.id));
186
187 info->fix.type = FB_TYPE_PACKED_PIXELS;
188 info->fix.visual = FB_VISUAL_MONO01;
189
190 info->fix.line_length = linebytes;
191
192 info->fix.accel = FB_ACCEL_SUN_BWTWO;
193 }
194
195 static u8 bw2regs_1600[] = {
196 0x14, 0x8b, 0x15, 0x28, 0x16, 0x03, 0x17, 0x13,
197 0x18, 0x7b, 0x19, 0x05, 0x1a, 0x34, 0x1b, 0x2e,
198 0x1c, 0x00, 0x1d, 0x0a, 0x1e, 0xff, 0x1f, 0x01,
199 0x10, 0x21, 0
200 };
201
202 static u8 bw2regs_ecl[] = {
203 0x14, 0x65, 0x15, 0x1e, 0x16, 0x04, 0x17, 0x0c,
204 0x18, 0x5e, 0x19, 0x03, 0x1a, 0xa7, 0x1b, 0x23,
205 0x1c, 0x00, 0x1d, 0x08, 0x1e, 0xff, 0x1f, 0x01,
206 0x10, 0x20, 0
207 };
208
209 static u8 bw2regs_analog[] = {
210 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x03, 0x17, 0x13,
211 0x18, 0xb0, 0x19, 0x03, 0x1a, 0xa6, 0x1b, 0x22,
212 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01,
213 0x10, 0x20, 0
214 };
215
216 static u8 bw2regs_76hz[] = {
217 0x14, 0xb7, 0x15, 0x27, 0x16, 0x03, 0x17, 0x0f,
218 0x18, 0xae, 0x19, 0x03, 0x1a, 0xae, 0x1b, 0x2a,
219 0x1c, 0x01, 0x1d, 0x09, 0x1e, 0xff, 0x1f, 0x01,
220 0x10, 0x24, 0
221 };
222
223 static u8 bw2regs_66hz[] = {
224 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x04, 0x17, 0x14,
225 0x18, 0xae, 0x19, 0x03, 0x1a, 0xa8, 0x1b, 0x24,
226 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01,
227 0x10, 0x20, 0
228 };
229
bw2_do_default_mode(struct bw2_par * par,struct fb_info * info,int * linebytes)230 static int bw2_do_default_mode(struct bw2_par *par, struct fb_info *info,
231 int *linebytes)
232 {
233 u8 status, mon;
234 u8 *p;
235
236 status = sbus_readb(&par->regs->status);
237 mon = status & BWTWO_SR_RES_MASK;
238 switch (status & BWTWO_SR_ID_MASK) {
239 case BWTWO_SR_ID_MONO_ECL:
240 if (mon == BWTWO_SR_1600_1280) {
241 p = bw2regs_1600;
242 info->var.xres = info->var.xres_virtual = 1600;
243 info->var.yres = info->var.yres_virtual = 1280;
244 *linebytes = 1600 / 8;
245 } else
246 p = bw2regs_ecl;
247 break;
248
249 case BWTWO_SR_ID_MONO:
250 p = bw2regs_analog;
251 break;
252
253 case BWTWO_SR_ID_MSYNC:
254 if (mon == BWTWO_SR_1152_900_76_A ||
255 mon == BWTWO_SR_1152_900_76_B)
256 p = bw2regs_76hz;
257 else
258 p = bw2regs_66hz;
259 break;
260
261 case BWTWO_SR_ID_NOCONN:
262 return 0;
263
264 default:
265 printk(KERN_ERR "bw2: can't handle SR %02x\n",
266 status);
267 return -EINVAL;
268 }
269 for ( ; *p; p += 2) {
270 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];
271 sbus_writeb(p[1], regp);
272 }
273 return 0;
274 }
275
bw2_probe(struct platform_device * op)276 static int bw2_probe(struct platform_device *op)
277 {
278 struct device_node *dp = op->dev.of_node;
279 struct fb_info *info;
280 struct bw2_par *par;
281 int linebytes, err;
282
283 info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev);
284
285 err = -ENOMEM;
286 if (!info)
287 goto out_err;
288 par = info->par;
289
290 spin_lock_init(&par->lock);
291
292 info->fix.smem_start = op->resource[0].start;
293 par->which_io = op->resource[0].flags & IORESOURCE_BITS;
294
295 sbusfb_fill_var(&info->var, dp, 1);
296 linebytes = of_getintprop_default(dp, "linebytes",
297 info->var.xres);
298
299 info->var.red.length = info->var.green.length =
300 info->var.blue.length = info->var.bits_per_pixel;
301 info->var.red.offset = info->var.green.offset =
302 info->var.blue.offset = 0;
303
304 par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET,
305 sizeof(struct bw2_regs), "bw2 regs");
306 if (!par->regs)
307 goto out_release_fb;
308
309 if (!of_find_property(dp, "width", NULL)) {
310 err = bw2_do_default_mode(par, info, &linebytes);
311 if (err)
312 goto out_unmap_regs;
313 }
314
315 info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
316
317 info->flags = FBINFO_DEFAULT;
318 info->fbops = &bw2_ops;
319
320 info->screen_base = of_ioremap(&op->resource[0], 0,
321 info->fix.smem_len, "bw2 ram");
322 if (!info->screen_base) {
323 err = -ENOMEM;
324 goto out_unmap_regs;
325 }
326
327 bw2_blank(FB_BLANK_UNBLANK, info);
328
329 bw2_init_fix(info, linebytes);
330
331 err = register_framebuffer(info);
332 if (err < 0)
333 goto out_unmap_screen;
334
335 dev_set_drvdata(&op->dev, info);
336
337 printk(KERN_INFO "%pOF: bwtwo at %lx:%lx\n",
338 dp, par->which_io, info->fix.smem_start);
339
340 return 0;
341
342 out_unmap_screen:
343 of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
344
345 out_unmap_regs:
346 of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
347
348 out_release_fb:
349 framebuffer_release(info);
350
351 out_err:
352 return err;
353 }
354
bw2_remove(struct platform_device * op)355 static int bw2_remove(struct platform_device *op)
356 {
357 struct fb_info *info = dev_get_drvdata(&op->dev);
358 struct bw2_par *par = info->par;
359
360 unregister_framebuffer(info);
361
362 of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
363 of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
364
365 framebuffer_release(info);
366
367 return 0;
368 }
369
370 static const struct of_device_id bw2_match[] = {
371 {
372 .name = "bwtwo",
373 },
374 {},
375 };
376 MODULE_DEVICE_TABLE(of, bw2_match);
377
378 static struct platform_driver bw2_driver = {
379 .driver = {
380 .name = "bw2",
381 .of_match_table = bw2_match,
382 },
383 .probe = bw2_probe,
384 .remove = bw2_remove,
385 };
386
bw2_init(void)387 static int __init bw2_init(void)
388 {
389 if (fb_get_options("bw2fb", NULL))
390 return -ENODEV;
391
392 return platform_driver_register(&bw2_driver);
393 }
394
bw2_exit(void)395 static void __exit bw2_exit(void)
396 {
397 platform_driver_unregister(&bw2_driver);
398 }
399
400 module_init(bw2_init);
401 module_exit(bw2_exit);
402
403 MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets");
404 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
405 MODULE_VERSION("2.0");
406 MODULE_LICENSE("GPL");
407