1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * HP300 Topcat framebuffer support (derived from macfb of all things)
4 * Phil Blundell <philb@gnu.org> 1998
5 * DIO-II, colour map and Catseye support by
6 * Kars de Jong <jongk@linux-m68k.org>, May 2004.
7 */
8
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/errno.h>
12 #include <linux/string.h>
13 #include <linux/mm.h>
14 #include <linux/delay.h>
15 #include <linux/init.h>
16 #include <linux/fb.h>
17 #include <linux/dio.h>
18
19 #include <asm/io.h>
20 #include <linux/uaccess.h>
21
22 static struct fb_info fb_info = {
23 .fix = {
24 .id = "HP300 ",
25 .type = FB_TYPE_PACKED_PIXELS,
26 .visual = FB_VISUAL_PSEUDOCOLOR,
27 .accel = FB_ACCEL_NONE,
28 }
29 };
30
31 static unsigned long fb_regs;
32 static unsigned char fb_bitmask;
33
34 #define TC_NBLANK 0x4080
35 #define TC_WEN 0x4088
36 #define TC_REN 0x408c
37 #define TC_FBEN 0x4090
38 #define TC_PRR 0x40ea
39
40 /* These defines match the X window system */
41 #define RR_CLEAR 0x0
42 #define RR_COPY 0x3
43 #define RR_NOOP 0x5
44 #define RR_XOR 0x6
45 #define RR_INVERT 0xa
46 #define RR_COPYINVERTED 0xc
47 #define RR_SET 0xf
48
49 /* blitter regs */
50 #define BUSY 0x4044
51 #define WMRR 0x40ef
52 #define SOURCE_X 0x40f2
53 #define SOURCE_Y 0x40f6
54 #define DEST_X 0x40fa
55 #define DEST_Y 0x40fe
56 #define WHEIGHT 0x4106
57 #define WWIDTH 0x4102
58 #define WMOVE 0x409c
59
60 static struct fb_var_screeninfo hpfb_defined = {
61 .red = {
62 .length = 8,
63 },
64 .green = {
65 .length = 8,
66 },
67 .blue = {
68 .length = 8,
69 },
70 .activate = FB_ACTIVATE_NOW,
71 .height = -1,
72 .width = -1,
73 .vmode = FB_VMODE_NONINTERLACED,
74 };
75
hpfb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)76 static int hpfb_setcolreg(unsigned regno, unsigned red, unsigned green,
77 unsigned blue, unsigned transp,
78 struct fb_info *info)
79 {
80 /* use MSBs */
81 unsigned char _red =red>>8;
82 unsigned char _green=green>>8;
83 unsigned char _blue =blue>>8;
84 unsigned char _regno=regno;
85
86 /*
87 * Set a single color register. The values supplied are
88 * already rounded down to the hardware's capabilities
89 * (according to the entries in the `var' structure). Return
90 * != 0 for invalid regno.
91 */
92
93 if (regno >= info->cmap.len)
94 return 1;
95
96 while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1);
97
98 out_be16(fb_regs + 0x60ba, 0xff);
99
100 out_be16(fb_regs + 0x60b2, _red);
101 out_be16(fb_regs + 0x60b4, _green);
102 out_be16(fb_regs + 0x60b6, _blue);
103 out_be16(fb_regs + 0x60b8, ~_regno);
104 out_be16(fb_regs + 0x60f0, 0xff);
105
106 udelay(100);
107
108 while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1);
109 out_be16(fb_regs + 0x60b2, 0);
110 out_be16(fb_regs + 0x60b4, 0);
111 out_be16(fb_regs + 0x60b6, 0);
112 out_be16(fb_regs + 0x60b8, 0);
113
114 return 0;
115 }
116
117 /* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
118
hpfb_blank(int blank,struct fb_info * info)119 static int hpfb_blank(int blank, struct fb_info *info)
120 {
121 out_8(fb_regs + TC_NBLANK, (blank ? 0x00 : fb_bitmask));
122
123 return 0;
124 }
125
topcat_blit(int x0,int y0,int x1,int y1,int w,int h,int rr)126 static void topcat_blit(int x0, int y0, int x1, int y1, int w, int h, int rr)
127 {
128 if (rr >= 0) {
129 while (in_8(fb_regs + BUSY) & fb_bitmask)
130 ;
131 }
132 out_8(fb_regs + TC_FBEN, fb_bitmask);
133 if (rr >= 0) {
134 out_8(fb_regs + TC_WEN, fb_bitmask);
135 out_8(fb_regs + WMRR, rr);
136 }
137 out_be16(fb_regs + SOURCE_X, x0);
138 out_be16(fb_regs + SOURCE_Y, y0);
139 out_be16(fb_regs + DEST_X, x1);
140 out_be16(fb_regs + DEST_Y, y1);
141 out_be16(fb_regs + WWIDTH, w);
142 out_be16(fb_regs + WHEIGHT, h);
143 out_8(fb_regs + WMOVE, fb_bitmask);
144 }
145
hpfb_copyarea(struct fb_info * info,const struct fb_copyarea * area)146 static void hpfb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
147 {
148 topcat_blit(area->sx, area->sy, area->dx, area->dy, area->width, area->height, RR_COPY);
149 }
150
hpfb_fillrect(struct fb_info * p,const struct fb_fillrect * region)151 static void hpfb_fillrect(struct fb_info *p, const struct fb_fillrect *region)
152 {
153 u8 clr;
154
155 clr = region->color & 0xff;
156
157 while (in_8(fb_regs + BUSY) & fb_bitmask)
158 ;
159
160 /* Foreground */
161 out_8(fb_regs + TC_WEN, fb_bitmask & clr);
162 out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_SET : RR_INVERT));
163
164 /* Background */
165 out_8(fb_regs + TC_WEN, fb_bitmask & ~clr);
166 out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_CLEAR : RR_NOOP));
167
168 topcat_blit(region->dx, region->dy, region->dx, region->dy, region->width, region->height, -1);
169 }
170
hpfb_sync(struct fb_info * info)171 static int hpfb_sync(struct fb_info *info)
172 {
173 /*
174 * Since we also access the framebuffer directly, we have to wait
175 * until the block mover is finished
176 */
177 while (in_8(fb_regs + BUSY) & fb_bitmask)
178 ;
179
180 out_8(fb_regs + TC_WEN, fb_bitmask);
181 out_8(fb_regs + TC_PRR, RR_COPY);
182 out_8(fb_regs + TC_FBEN, fb_bitmask);
183
184 return 0;
185 }
186
187 static const struct fb_ops hpfb_ops = {
188 .owner = THIS_MODULE,
189 __FB_DEFAULT_IOMEM_OPS_RDWR,
190 .fb_setcolreg = hpfb_setcolreg,
191 .fb_blank = hpfb_blank,
192 .fb_fillrect = hpfb_fillrect,
193 .fb_copyarea = hpfb_copyarea,
194 .fb_imageblit = cfb_imageblit,
195 .fb_sync = hpfb_sync,
196 __FB_DEFAULT_IOMEM_OPS_MMAP,
197 };
198
199 /* Common to all HP framebuffers */
200 #define HPFB_FBWMSB 0x05 /* Frame buffer width */
201 #define HPFB_FBWLSB 0x07
202 #define HPFB_FBHMSB 0x09 /* Frame buffer height */
203 #define HPFB_FBHLSB 0x0b
204 #define HPFB_DWMSB 0x0d /* Display width */
205 #define HPFB_DWLSB 0x0f
206 #define HPFB_DHMSB 0x11 /* Display height */
207 #define HPFB_DHLSB 0x13
208 #define HPFB_NUMPLANES 0x5b /* Number of colour planes */
209 #define HPFB_FBOMSB 0x5d /* Frame buffer offset */
210 #define HPFB_FBOLSB 0x5f
211
hpfb_init_one(unsigned long phys_base,unsigned long virt_base)212 static int hpfb_init_one(unsigned long phys_base, unsigned long virt_base)
213 {
214 unsigned long fboff, fb_width, fb_height, fb_start;
215 int ret;
216
217 fb_regs = virt_base;
218 fboff = (in_8(fb_regs + HPFB_FBOMSB) << 8) | in_8(fb_regs + HPFB_FBOLSB);
219
220 fb_info.fix.smem_start = (in_8(fb_regs + fboff) << 16);
221
222 if (phys_base >= DIOII_BASE) {
223 fb_info.fix.smem_start += phys_base;
224 }
225
226 if (DIO_SECID(fb_regs) != DIO_ID2_TOPCAT) {
227 /* This is the magic incantation the HP X server uses to make Catseye boards work. */
228 while (in_be16(fb_regs+0x4800) & 1)
229 ;
230 out_be16(fb_regs+0x4800, 0); /* Catseye status */
231 out_be16(fb_regs+0x4510, 0); /* VB */
232 out_be16(fb_regs+0x4512, 0); /* TCNTRL */
233 out_be16(fb_regs+0x4514, 0); /* ACNTRL */
234 out_be16(fb_regs+0x4516, 0); /* PNCNTRL */
235 out_be16(fb_regs+0x4206, 0x90); /* RUG Command/Status */
236 out_be16(fb_regs+0x60a2, 0); /* Overlay Mask */
237 out_be16(fb_regs+0x60bc, 0); /* Ram Select */
238 }
239
240 /*
241 * Fill in the available video resolution
242 */
243 fb_width = (in_8(fb_regs + HPFB_FBWMSB) << 8) | in_8(fb_regs + HPFB_FBWLSB);
244 fb_info.fix.line_length = fb_width;
245 fb_height = (in_8(fb_regs + HPFB_FBHMSB) << 8) | in_8(fb_regs + HPFB_FBHLSB);
246 fb_info.fix.smem_len = fb_width * fb_height;
247 fb_start = (unsigned long)ioremap_wt(fb_info.fix.smem_start,
248 fb_info.fix.smem_len);
249 hpfb_defined.xres = (in_8(fb_regs + HPFB_DWMSB) << 8) | in_8(fb_regs + HPFB_DWLSB);
250 hpfb_defined.yres = (in_8(fb_regs + HPFB_DHMSB) << 8) | in_8(fb_regs + HPFB_DHLSB);
251 hpfb_defined.xres_virtual = hpfb_defined.xres;
252 hpfb_defined.yres_virtual = hpfb_defined.yres;
253 hpfb_defined.bits_per_pixel = in_8(fb_regs + HPFB_NUMPLANES);
254
255 printk(KERN_INFO "hpfb: framebuffer at 0x%lx, mapped to 0x%lx, size %dk\n",
256 fb_info.fix.smem_start, fb_start, fb_info.fix.smem_len/1024);
257 printk(KERN_INFO "hpfb: mode is %dx%dx%d, linelength=%d\n",
258 hpfb_defined.xres, hpfb_defined.yres, hpfb_defined.bits_per_pixel, fb_info.fix.line_length);
259
260 /*
261 * Give the hardware a bit of a prod and work out how many bits per
262 * pixel are supported.
263 */
264 out_8(fb_regs + TC_WEN, 0xff);
265 out_8(fb_regs + TC_PRR, RR_COPY);
266 out_8(fb_regs + TC_FBEN, 0xff);
267 out_8(fb_start, 0xff);
268 fb_bitmask = in_8(fb_start);
269 out_8(fb_start, 0);
270
271 /*
272 * Enable reading/writing of all the planes.
273 */
274 out_8(fb_regs + TC_WEN, fb_bitmask);
275 out_8(fb_regs + TC_PRR, RR_COPY);
276 out_8(fb_regs + TC_REN, fb_bitmask);
277 out_8(fb_regs + TC_FBEN, fb_bitmask);
278
279 /*
280 * Clear the screen.
281 */
282 topcat_blit(0, 0, 0, 0, fb_width, fb_height, RR_CLEAR);
283
284 /*
285 * Let there be consoles..
286 */
287 if (DIO_SECID(fb_regs) == DIO_ID2_TOPCAT)
288 strcat(fb_info.fix.id, "Topcat");
289 else
290 strcat(fb_info.fix.id, "Catseye");
291 fb_info.fbops = &hpfb_ops;
292 fb_info.var = hpfb_defined;
293 fb_info.screen_base = (char *)fb_start;
294
295 ret = fb_alloc_cmap(&fb_info.cmap, 1 << hpfb_defined.bits_per_pixel, 0);
296 if (ret < 0)
297 goto unmap_screen_base;
298
299 ret = register_framebuffer(&fb_info);
300 if (ret < 0)
301 goto dealloc_cmap;
302
303 fb_info(&fb_info, "%s frame buffer device\n", fb_info.fix.id);
304
305 return 0;
306
307 dealloc_cmap:
308 fb_dealloc_cmap(&fb_info.cmap);
309
310 unmap_screen_base:
311 if (fb_info.screen_base) {
312 iounmap(fb_info.screen_base);
313 fb_info.screen_base = NULL;
314 }
315
316 return ret;
317 }
318
319 /*
320 * Check that the secondary ID indicates that we have some hope of working with this
321 * framebuffer. The catseye boards are pretty much like topcats and we can muddle through.
322 */
323
324 #define topcat_sid_ok(x) (((x) == DIO_ID2_LRCATSEYE) || ((x) == DIO_ID2_HRCCATSEYE) \
325 || ((x) == DIO_ID2_HRMCATSEYE) || ((x) == DIO_ID2_TOPCAT))
326
327 /*
328 * Initialise the framebuffer
329 */
hpfb_dio_probe(struct dio_dev * d,const struct dio_device_id * ent)330 static int hpfb_dio_probe(struct dio_dev *d, const struct dio_device_id *ent)
331 {
332 unsigned long paddr, vaddr;
333
334 paddr = d->resource.start;
335 if (!request_mem_region(d->resource.start, resource_size(&d->resource), d->name))
336 return -EBUSY;
337
338 if (d->scode >= DIOII_SCBASE) {
339 vaddr = (unsigned long)ioremap(paddr, resource_size(&d->resource));
340 } else {
341 vaddr = paddr + DIO_VIRADDRBASE;
342 }
343 printk(KERN_INFO "Topcat found at DIO select code %d "
344 "(secondary id %02x)\n", d->scode, (d->id >> 8) & 0xff);
345 if (hpfb_init_one(paddr, vaddr)) {
346 if (d->scode >= DIOII_SCBASE)
347 iounmap((void *)vaddr);
348 release_mem_region(d->resource.start, resource_size(&d->resource));
349 return -ENOMEM;
350 }
351 return 0;
352 }
353
hpfb_remove_one(struct dio_dev * d)354 static void hpfb_remove_one(struct dio_dev *d)
355 {
356 unregister_framebuffer(&fb_info);
357 if (d->scode >= DIOII_SCBASE)
358 iounmap((void *)fb_regs);
359 release_mem_region(d->resource.start, resource_size(&d->resource));
360 fb_dealloc_cmap(&fb_info.cmap);
361 if (fb_info.screen_base)
362 iounmap(fb_info.screen_base);
363 }
364
365 static struct dio_device_id hpfb_dio_tbl[] = {
366 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_LRCATSEYE) },
367 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRCCATSEYE) },
368 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRMCATSEYE) },
369 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_TOPCAT) },
370 { 0 }
371 };
372
373 static struct dio_driver hpfb_driver = {
374 .name = "hpfb",
375 .id_table = hpfb_dio_tbl,
376 .probe = hpfb_dio_probe,
377 .remove = hpfb_remove_one,
378 };
379
hpfb_init(void)380 static int __init hpfb_init(void)
381 {
382 unsigned int sid;
383 unsigned char i;
384 int err;
385
386 /* Topcats can be on the internal IO bus or real DIO devices.
387 * The internal variant sits at 0x560000; it has primary
388 * and secondary ID registers just like the DIO version.
389 * So we merge the two detection routines.
390 *
391 * Perhaps this #define should be in a global header file:
392 * I believe it's common to all internal fbs, not just topcat.
393 */
394 #define INTFBVADDR 0xf0560000
395 #define INTFBPADDR 0x560000
396
397 if (!MACH_IS_HP300)
398 return -ENODEV;
399
400 if (fb_get_options("hpfb", NULL))
401 return -ENODEV;
402
403 err = dio_register_driver(&hpfb_driver);
404 if (err)
405 return err;
406
407 err = copy_from_kernel_nofault(&i, (unsigned char *)INTFBVADDR + DIO_IDOFF, 1);
408
409 if (!err && (i == DIO_ID_FBUFFER) && topcat_sid_ok(sid = DIO_SECID(INTFBVADDR))) {
410 if (!request_mem_region(INTFBPADDR, DIO_DEVSIZE, "Internal Topcat"))
411 return -EBUSY;
412 printk(KERN_INFO "Internal Topcat found (secondary id %02x)\n", sid);
413 if (hpfb_init_one(INTFBPADDR, INTFBVADDR)) {
414 return -ENOMEM;
415 }
416 }
417 return 0;
418 }
419
hpfb_cleanup_module(void)420 static void __exit hpfb_cleanup_module(void)
421 {
422 dio_unregister_driver(&hpfb_driver);
423 }
424
425 module_init(hpfb_init);
426 module_exit(hpfb_cleanup_module);
427
428 MODULE_LICENSE("GPL");
429