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 |
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(lock: &par->lock, flags); |
146 | |
147 | return 0; |
148 | } |
149 | |
150 | static struct sbus_mmap_map bw2_mmap_map[] = { |
151 | { |
152 | .size = SBUS_MMAP_FBSIZE(1) |
153 | }, |
154 | { .size = 0 } |
155 | }; |
156 | |
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(map: bw2_mmap_map, |
162 | physbase: info->fix.smem_start, fbsize: info->fix.smem_len, |
163 | iospace: par->which_io, |
164 | vma); |
165 | } |
166 | |
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 | type: FBTYPE_SUN2BW, fb_depth: 1, fb_size: info->fix.smem_len); |
171 | } |
172 | |
173 | /* |
174 | * Initialisation |
175 | */ |
176 | |
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 | |
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 | |
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(size: sizeof(struct bw2_par), dev: &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(var: &info->var, dp, bpp: 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(np: dp, propname: "width" )) { |
304 | err = bw2_do_default_mode(par, info, linebytes: &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(blank: FB_BLANK_UNBLANK, info); |
321 | |
322 | bw2_init_fix(info, linebytes); |
323 | |
324 | err = register_framebuffer(fb_info: info); |
325 | if (err < 0) |
326 | goto out_unmap_screen; |
327 | |
328 | dev_set_drvdata(dev: &op->dev, data: 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 | |
348 | static void bw2_remove(struct platform_device *op) |
349 | { |
350 | struct fb_info *info = dev_get_drvdata(dev: &op->dev); |
351 | struct bw2_par *par = info->par; |
352 | |
353 | unregister_framebuffer(fb_info: 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_new = bw2_remove, |
376 | }; |
377 | |
378 | static int __init bw2_init(void) |
379 | { |
380 | if (fb_get_options(name: "bw2fb" , NULL)) |
381 | return -ENODEV; |
382 | |
383 | return platform_driver_register(&bw2_driver); |
384 | } |
385 | |
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 | |