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