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 | |
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 | |
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 | |
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 | |
146 | static void hpfb_copyarea(struct fb_info *info, const struct fb_copyarea *area) |
147 | { |
148 | topcat_blit(x0: area->sx, y0: area->sy, x1: area->dx, y1: area->dy, w: area->width, h: area->height, RR_COPY); |
149 | } |
150 | |
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(x0: region->dx, y0: region->dy, x1: region->dx, y1: region->dy, w: region->width, h: region->height, rr: -1); |
169 | } |
170 | |
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 | |
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(offset: fb_info.fix.smem_start, |
248 | size: 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(x0: 0, y0: 0, x1: 0, y1: 0, w: fb_width, h: fb_height, RR_CLEAR); |
283 | |
284 | /* |
285 | * Let there be consoles.. |
286 | */ |
287 | if (DIO_SECID(fb_regs) == DIO_ID2_TOPCAT) |
288 | strcat(p: fb_info.fix.id, q: "Topcat" ); |
289 | else |
290 | strcat(p: fb_info.fix.id, q: "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(cmap: &fb_info.cmap, len: 1 << hpfb_defined.bits_per_pixel, transp: 0); |
296 | if (ret < 0) |
297 | goto unmap_screen_base; |
298 | |
299 | ret = register_framebuffer(fb_info: &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(cmap: &fb_info.cmap); |
309 | |
310 | unmap_screen_base: |
311 | if (fb_info.screen_base) { |
312 | iounmap(addr: 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 | */ |
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(offset: paddr, size: resource_size(res: &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(phys_base: paddr, virt_base: vaddr)) { |
346 | if (d->scode >= DIOII_SCBASE) |
347 | iounmap(addr: (void *)vaddr); |
348 | return -ENOMEM; |
349 | } |
350 | return 0; |
351 | } |
352 | |
353 | static void hpfb_remove_one(struct dio_dev *d) |
354 | { |
355 | unregister_framebuffer(fb_info: &fb_info); |
356 | if (d->scode >= DIOII_SCBASE) |
357 | iounmap(addr: (void *)fb_regs); |
358 | release_mem_region(d->resource.start, resource_size(&d->resource)); |
359 | fb_dealloc_cmap(cmap: &fb_info.cmap); |
360 | if (fb_info.screen_base) |
361 | iounmap(addr: fb_info.screen_base); |
362 | } |
363 | |
364 | static struct dio_device_id hpfb_dio_tbl[] = { |
365 | { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_LRCATSEYE) }, |
366 | { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRCCATSEYE) }, |
367 | { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRMCATSEYE) }, |
368 | { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_TOPCAT) }, |
369 | { 0 } |
370 | }; |
371 | |
372 | static struct dio_driver hpfb_driver = { |
373 | .name = "hpfb" , |
374 | .id_table = hpfb_dio_tbl, |
375 | .probe = hpfb_dio_probe, |
376 | .remove = hpfb_remove_one, |
377 | }; |
378 | |
379 | static int __init hpfb_init(void) |
380 | { |
381 | unsigned int sid; |
382 | unsigned char i; |
383 | int err; |
384 | |
385 | /* Topcats can be on the internal IO bus or real DIO devices. |
386 | * The internal variant sits at 0x560000; it has primary |
387 | * and secondary ID registers just like the DIO version. |
388 | * So we merge the two detection routines. |
389 | * |
390 | * Perhaps this #define should be in a global header file: |
391 | * I believe it's common to all internal fbs, not just topcat. |
392 | */ |
393 | #define INTFBVADDR 0xf0560000 |
394 | #define INTFBPADDR 0x560000 |
395 | |
396 | if (!MACH_IS_HP300) |
397 | return -ENODEV; |
398 | |
399 | if (fb_get_options(name: "hpfb" , NULL)) |
400 | return -ENODEV; |
401 | |
402 | err = dio_register_driver(&hpfb_driver); |
403 | if (err) |
404 | return err; |
405 | |
406 | err = copy_from_kernel_nofault(dst: &i, src: (unsigned char *)INTFBVADDR + DIO_IDOFF, size: 1); |
407 | |
408 | if (!err && (i == DIO_ID_FBUFFER) && topcat_sid_ok(sid = DIO_SECID(INTFBVADDR))) { |
409 | if (!request_mem_region(INTFBPADDR, DIO_DEVSIZE, "Internal Topcat" )) |
410 | return -EBUSY; |
411 | printk(KERN_INFO "Internal Topcat found (secondary id %02x)\n" , sid); |
412 | if (hpfb_init_one(INTFBPADDR, INTFBVADDR)) { |
413 | return -ENOMEM; |
414 | } |
415 | } |
416 | return 0; |
417 | } |
418 | |
419 | static void __exit hpfb_cleanup_module(void) |
420 | { |
421 | dio_unregister_driver(&hpfb_driver); |
422 | } |
423 | |
424 | module_init(hpfb_init); |
425 | module_exit(hpfb_cleanup_module); |
426 | |
427 | MODULE_LICENSE("GPL" ); |
428 | |