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_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma);
35 static int bw2_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg);
36
37 /*
38 * Frame buffer operations
39 */
40
41 static const struct fb_ops bw2_ops = {
42 .owner = THIS_MODULE,
43 FB_DEFAULT_SBUS_OPS(bw2),
44 .fb_blank = bw2_blank,
45 };
46
47 /* OBio addresses for the bwtwo registers */
48 #define BWTWO_REGISTER_OFFSET 0x400000
49
50 struct bt_regs {
51 u32 addr;
52 u32 color_map;
53 u32 control;
54 u32 cursor;
55 };
56
57 struct bw2_regs {
58 struct bt_regs cmap;
59 u8 control;
60 u8 status;
61 u8 cursor_start;
62 u8 cursor_end;
63 u8 h_blank_start;
64 u8 h_blank_end;
65 u8 h_sync_start;
66 u8 h_sync_end;
67 u8 comp_sync_end;
68 u8 v_blank_start_high;
69 u8 v_blank_start_low;
70 u8 v_blank_end;
71 u8 v_sync_start;
72 u8 v_sync_end;
73 u8 xfer_holdoff_start;
74 u8 xfer_holdoff_end;
75 };
76
77 /* Status Register Constants */
78 #define BWTWO_SR_RES_MASK 0x70
79 #define BWTWO_SR_1600_1280 0x50
80 #define BWTWO_SR_1152_900_76_A 0x40
81 #define BWTWO_SR_1152_900_76_B 0x60
82 #define BWTWO_SR_ID_MASK 0x0f
83 #define BWTWO_SR_ID_MONO 0x02
84 #define BWTWO_SR_ID_MONO_ECL 0x03
85 #define BWTWO_SR_ID_MSYNC 0x04
86 #define BWTWO_SR_ID_NOCONN 0x0a
87
88 /* Control Register Constants */
89 #define BWTWO_CTL_ENABLE_INTS 0x80
90 #define BWTWO_CTL_ENABLE_VIDEO 0x40
91 #define BWTWO_CTL_ENABLE_TIMING 0x20
92 #define BWTWO_CTL_ENABLE_CURCMP 0x10
93 #define BWTWO_CTL_XTAL_MASK 0x0C
94 #define BWTWO_CTL_DIVISOR_MASK 0x03
95
96 /* Status Register Constants */
97 #define BWTWO_STAT_PENDING_INT 0x80
98 #define BWTWO_STAT_MSENSE_MASK 0x70
99 #define BWTWO_STAT_ID_MASK 0x0f
100
101 struct bw2_par {
102 spinlock_t lock;
103 struct bw2_regs __iomem *regs;
104
105 u32 flags;
106 #define BW2_FLAG_BLANKED 0x00000001
107
108 unsigned long which_io;
109 };
110
111 /**
112 * bw2_blank - Optional function. Blanks the display.
113 * @blank: the blank mode we want.
114 * @info: frame buffer structure that represents a single frame buffer
115 */
116 static int
bw2_blank(int blank,struct fb_info * info)117 bw2_blank(int blank, struct fb_info *info)
118 {
119 struct bw2_par *par = (struct bw2_par *) info->par;
120 struct bw2_regs __iomem *regs = par->regs;
121 unsigned long flags;
122 u8 val;
123
124 spin_lock_irqsave(&par->lock, flags);
125
126 switch (blank) {
127 case FB_BLANK_UNBLANK: /* Unblanking */
128 val = sbus_readb(®s->control);
129 val |= BWTWO_CTL_ENABLE_VIDEO;
130 sbus_writeb(val, ®s->control);
131 par->flags &= ~BW2_FLAG_BLANKED;
132 break;
133
134 case FB_BLANK_NORMAL: /* Normal blanking */
135 case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
136 case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
137 case FB_BLANK_POWERDOWN: /* Poweroff */
138 val = sbus_readb(®s->control);
139 val &= ~BWTWO_CTL_ENABLE_VIDEO;
140 sbus_writeb(val, ®s->control);
141 par->flags |= BW2_FLAG_BLANKED;
142 break;
143 }
144
145 spin_unlock_irqrestore(&par->lock, flags);
146
147 return 0;
148 }
149
150 static const struct sbus_mmap_map bw2_mmap_map[] = {
151 {
152 .size = SBUS_MMAP_FBSIZE(1)
153 },
154 { .size = 0 }
155 };
156
bw2_sbusfb_mmap(struct fb_info * info,struct vm_area_struct * vma)157 static int bw2_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
158 {
159 struct bw2_par *par = (struct bw2_par *)info->par;
160
161 return sbusfb_mmap_helper(bw2_mmap_map,
162 info->fix.smem_start, info->fix.smem_len,
163 par->which_io,
164 vma);
165 }
166
bw2_sbusfb_ioctl(struct fb_info * info,unsigned int cmd,unsigned long arg)167 static int bw2_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
168 {
169 return sbusfb_ioctl_helper(cmd, arg, info,
170 FBTYPE_SUN2BW, 1, info->fix.smem_len);
171 }
172
173 /*
174 * Initialisation
175 */
176
bw2_init_fix(struct fb_info * info,int linebytes)177 static void bw2_init_fix(struct fb_info *info, int linebytes)
178 {
179 strscpy(info->fix.id, "bwtwo", sizeof(info->fix.id));
180
181 info->fix.type = FB_TYPE_PACKED_PIXELS;
182 info->fix.visual = FB_VISUAL_MONO01;
183
184 info->fix.line_length = linebytes;
185
186 info->fix.accel = FB_ACCEL_SUN_BWTWO;
187 }
188
189 static u8 bw2regs_1600[] = {
190 0x14, 0x8b, 0x15, 0x28, 0x16, 0x03, 0x17, 0x13,
191 0x18, 0x7b, 0x19, 0x05, 0x1a, 0x34, 0x1b, 0x2e,
192 0x1c, 0x00, 0x1d, 0x0a, 0x1e, 0xff, 0x1f, 0x01,
193 0x10, 0x21, 0
194 };
195
196 static u8 bw2regs_ecl[] = {
197 0x14, 0x65, 0x15, 0x1e, 0x16, 0x04, 0x17, 0x0c,
198 0x18, 0x5e, 0x19, 0x03, 0x1a, 0xa7, 0x1b, 0x23,
199 0x1c, 0x00, 0x1d, 0x08, 0x1e, 0xff, 0x1f, 0x01,
200 0x10, 0x20, 0
201 };
202
203 static u8 bw2regs_analog[] = {
204 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x03, 0x17, 0x13,
205 0x18, 0xb0, 0x19, 0x03, 0x1a, 0xa6, 0x1b, 0x22,
206 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01,
207 0x10, 0x20, 0
208 };
209
210 static u8 bw2regs_76hz[] = {
211 0x14, 0xb7, 0x15, 0x27, 0x16, 0x03, 0x17, 0x0f,
212 0x18, 0xae, 0x19, 0x03, 0x1a, 0xae, 0x1b, 0x2a,
213 0x1c, 0x01, 0x1d, 0x09, 0x1e, 0xff, 0x1f, 0x01,
214 0x10, 0x24, 0
215 };
216
217 static u8 bw2regs_66hz[] = {
218 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x04, 0x17, 0x14,
219 0x18, 0xae, 0x19, 0x03, 0x1a, 0xa8, 0x1b, 0x24,
220 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01,
221 0x10, 0x20, 0
222 };
223
bw2_do_default_mode(struct bw2_par * par,struct fb_info * info,int * linebytes)224 static int bw2_do_default_mode(struct bw2_par *par, struct fb_info *info,
225 int *linebytes)
226 {
227 u8 status, mon;
228 u8 *p;
229
230 status = sbus_readb(&par->regs->status);
231 mon = status & BWTWO_SR_RES_MASK;
232 switch (status & BWTWO_SR_ID_MASK) {
233 case BWTWO_SR_ID_MONO_ECL:
234 if (mon == BWTWO_SR_1600_1280) {
235 p = bw2regs_1600;
236 info->var.xres = info->var.xres_virtual = 1600;
237 info->var.yres = info->var.yres_virtual = 1280;
238 *linebytes = 1600 / 8;
239 } else
240 p = bw2regs_ecl;
241 break;
242
243 case BWTWO_SR_ID_MONO:
244 p = bw2regs_analog;
245 break;
246
247 case BWTWO_SR_ID_MSYNC:
248 if (mon == BWTWO_SR_1152_900_76_A ||
249 mon == BWTWO_SR_1152_900_76_B)
250 p = bw2regs_76hz;
251 else
252 p = bw2regs_66hz;
253 break;
254
255 case BWTWO_SR_ID_NOCONN:
256 return 0;
257
258 default:
259 printk(KERN_ERR "bw2: can't handle SR %02x\n",
260 status);
261 return -EINVAL;
262 }
263 for ( ; *p; p += 2) {
264 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];
265 sbus_writeb(p[1], regp);
266 }
267 return 0;
268 }
269
bw2_probe(struct platform_device * op)270 static int bw2_probe(struct platform_device *op)
271 {
272 struct device_node *dp = op->dev.of_node;
273 struct fb_info *info;
274 struct bw2_par *par;
275 int linebytes, err;
276
277 info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev);
278
279 err = -ENOMEM;
280 if (!info)
281 goto out_err;
282 par = info->par;
283
284 spin_lock_init(&par->lock);
285
286 info->fix.smem_start = op->resource[0].start;
287 par->which_io = op->resource[0].flags & IORESOURCE_BITS;
288
289 sbusfb_fill_var(&info->var, dp, 1);
290 linebytes = of_getintprop_default(dp, "linebytes",
291 info->var.xres);
292
293 info->var.red.length = info->var.green.length =
294 info->var.blue.length = info->var.bits_per_pixel;
295 info->var.red.offset = info->var.green.offset =
296 info->var.blue.offset = 0;
297
298 par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET,
299 sizeof(struct bw2_regs), "bw2 regs");
300 if (!par->regs)
301 goto out_release_fb;
302
303 if (!of_property_present(dp, "width")) {
304 err = bw2_do_default_mode(par, info, &linebytes);
305 if (err)
306 goto out_unmap_regs;
307 }
308
309 info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
310
311 info->fbops = &bw2_ops;
312
313 info->screen_base = of_ioremap(&op->resource[0], 0,
314 info->fix.smem_len, "bw2 ram");
315 if (!info->screen_base) {
316 err = -ENOMEM;
317 goto out_unmap_regs;
318 }
319
320 bw2_blank(FB_BLANK_UNBLANK, info);
321
322 bw2_init_fix(info, linebytes);
323
324 err = register_framebuffer(info);
325 if (err < 0)
326 goto out_unmap_screen;
327
328 dev_set_drvdata(&op->dev, info);
329
330 printk(KERN_INFO "%pOF: bwtwo at %lx:%lx\n",
331 dp, par->which_io, info->fix.smem_start);
332
333 return 0;
334
335 out_unmap_screen:
336 of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
337
338 out_unmap_regs:
339 of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
340
341 out_release_fb:
342 framebuffer_release(info);
343
344 out_err:
345 return err;
346 }
347
bw2_remove(struct platform_device * op)348 static void bw2_remove(struct platform_device *op)
349 {
350 struct fb_info *info = dev_get_drvdata(&op->dev);
351 struct bw2_par *par = info->par;
352
353 unregister_framebuffer(info);
354
355 of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
356 of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
357
358 framebuffer_release(info);
359 }
360
361 static const struct of_device_id bw2_match[] = {
362 {
363 .name = "bwtwo",
364 },
365 {},
366 };
367 MODULE_DEVICE_TABLE(of, bw2_match);
368
369 static struct platform_driver bw2_driver = {
370 .driver = {
371 .name = "bw2",
372 .of_match_table = bw2_match,
373 },
374 .probe = bw2_probe,
375 .remove = bw2_remove,
376 };
377
bw2_init(void)378 static int __init bw2_init(void)
379 {
380 if (fb_get_options("bw2fb", NULL))
381 return -ENODEV;
382
383 return platform_driver_register(&bw2_driver);
384 }
385
bw2_exit(void)386 static void __exit bw2_exit(void)
387 {
388 platform_driver_unregister(&bw2_driver);
389 }
390
391 module_init(bw2_init);
392 module_exit(bw2_exit);
393
394 MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets");
395 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
396 MODULE_VERSION("2.0");
397 MODULE_LICENSE("GPL");
398