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de7c6d15 JK |
1 | /* |
2 | * linux/drivers/video/metronomefb.c -- FB driver for Metronome controller | |
3 | * | |
4 | * Copyright (C) 2008, Jaya Kumar | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file COPYING in the main directory of this archive for | |
8 | * more details. | |
9 | * | |
10 | * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven. | |
11 | * | |
12 | * This work was made possible by help and equipment support from E-Ink | |
13 | * Corporation. http://support.eink.com/community | |
14 | * | |
15 | * This driver is written to be used with the Metronome display controller. | |
03c33a4f JK |
16 | * It is intended to be architecture independent. A board specific driver |
17 | * must be used to perform all the physical IO interactions. An example | |
18 | * is provided as am200epd.c | |
de7c6d15 | 19 | * |
de7c6d15 JK |
20 | */ |
21 | #include <linux/module.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/mm.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/vmalloc.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/fb.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/platform_device.h> | |
33 | #include <linux/list.h> | |
34 | #include <linux/firmware.h> | |
35 | #include <linux/dma-mapping.h> | |
36 | #include <linux/uaccess.h> | |
37 | #include <linux/irq.h> | |
38 | ||
03c33a4f JK |
39 | #include <video/metronomefb.h> |
40 | ||
de7c6d15 JK |
41 | #include <asm/unaligned.h> |
42 | ||
de7c6d15 JK |
43 | /* Display specific information */ |
44 | #define DPY_W 832 | |
45 | #define DPY_H 622 | |
46 | ||
de7c6d15 JK |
47 | /* frame differs from image. frame includes non-visible pixels */ |
48 | struct epd_frame { | |
49 | int fw; /* frame width */ | |
50 | int fh; /* frame height */ | |
51 | }; | |
52 | ||
53 | static struct epd_frame epd_frame_table[] = { | |
54 | { | |
55 | .fw = 832, | |
56 | .fh = 622 | |
57 | }, | |
58 | }; | |
59 | ||
60 | static struct fb_fix_screeninfo metronomefb_fix __devinitdata = { | |
61 | .id = "metronomefb", | |
62 | .type = FB_TYPE_PACKED_PIXELS, | |
63 | .visual = FB_VISUAL_STATIC_PSEUDOCOLOR, | |
64 | .xpanstep = 0, | |
65 | .ypanstep = 0, | |
66 | .ywrapstep = 0, | |
67 | .line_length = DPY_W, | |
68 | .accel = FB_ACCEL_NONE, | |
69 | }; | |
70 | ||
71 | static struct fb_var_screeninfo metronomefb_var __devinitdata = { | |
72 | .xres = DPY_W, | |
73 | .yres = DPY_H, | |
74 | .xres_virtual = DPY_W, | |
75 | .yres_virtual = DPY_H, | |
76 | .bits_per_pixel = 8, | |
77 | .grayscale = 1, | |
78 | .nonstd = 1, | |
79 | .red = { 4, 3, 0 }, | |
80 | .green = { 0, 0, 0 }, | |
81 | .blue = { 0, 0, 0 }, | |
82 | .transp = { 0, 0, 0 }, | |
83 | }; | |
84 | ||
03c33a4f | 85 | /* the waveform structure that is coming from userspace firmware */ |
de7c6d15 JK |
86 | struct waveform_hdr { |
87 | u8 stuff[32]; | |
88 | ||
89 | u8 wmta[3]; | |
90 | u8 fvsn; | |
91 | ||
92 | u8 luts; | |
93 | u8 mc; | |
94 | u8 trc; | |
95 | u8 stuff3; | |
96 | ||
97 | u8 endb; | |
98 | u8 swtb; | |
99 | u8 stuff2a[2]; | |
100 | ||
101 | u8 stuff2b[3]; | |
102 | u8 wfm_cs; | |
103 | } __attribute__ ((packed)); | |
104 | ||
105 | /* main metronomefb functions */ | |
106 | static u8 calc_cksum(int start, int end, u8 *mem) | |
107 | { | |
108 | u8 tmp = 0; | |
109 | int i; | |
110 | ||
111 | for (i = start; i < end; i++) | |
112 | tmp += mem[i]; | |
113 | ||
114 | return tmp; | |
115 | } | |
116 | ||
117 | static u16 calc_img_cksum(u16 *start, int length) | |
118 | { | |
119 | u16 tmp = 0; | |
120 | ||
121 | while (length--) | |
122 | tmp += *start++; | |
123 | ||
124 | return tmp; | |
125 | } | |
126 | ||
127 | /* here we decode the incoming waveform file and populate metromem */ | |
128 | #define EXP_WFORM_SIZE 47001 | |
28501336 JK |
129 | static int __devinit load_waveform(u8 *mem, size_t size, int m, int t, |
130 | struct metronomefb_par *par) | |
de7c6d15 JK |
131 | { |
132 | int tta; | |
133 | int wmta; | |
134 | int trn = 0; | |
135 | int i; | |
136 | unsigned char v; | |
137 | u8 cksum; | |
138 | int cksum_idx; | |
139 | int wfm_idx, owfm_idx; | |
140 | int mem_idx = 0; | |
141 | struct waveform_hdr *wfm_hdr; | |
28501336 JK |
142 | u8 *metromem = par->metromem_wfm; |
143 | struct device *dev = par->info->dev; | |
de7c6d15 JK |
144 | |
145 | if (size != EXP_WFORM_SIZE) { | |
28501336 | 146 | dev_err(dev, "Error: unexpected size %d != %d\n", size, |
de7c6d15 JK |
147 | EXP_WFORM_SIZE); |
148 | return -EINVAL; | |
149 | } | |
150 | ||
151 | wfm_hdr = (struct waveform_hdr *) mem; | |
152 | ||
153 | if (wfm_hdr->fvsn != 1) { | |
28501336 | 154 | dev_err(dev, "Error: bad fvsn %x\n", wfm_hdr->fvsn); |
de7c6d15 JK |
155 | return -EINVAL; |
156 | } | |
157 | if (wfm_hdr->luts != 0) { | |
28501336 | 158 | dev_err(dev, "Error: bad luts %x\n", wfm_hdr->luts); |
de7c6d15 JK |
159 | return -EINVAL; |
160 | } | |
161 | cksum = calc_cksum(32, 47, mem); | |
162 | if (cksum != wfm_hdr->wfm_cs) { | |
28501336 | 163 | dev_err(dev, "Error: bad cksum %x != %x\n", cksum, |
de7c6d15 JK |
164 | wfm_hdr->wfm_cs); |
165 | return -EINVAL; | |
166 | } | |
167 | wfm_hdr->mc += 1; | |
168 | wfm_hdr->trc += 1; | |
169 | for (i = 0; i < 5; i++) { | |
170 | if (*(wfm_hdr->stuff2a + i) != 0) { | |
28501336 | 171 | dev_err(dev, "Error: unexpected value in padding\n"); |
de7c6d15 JK |
172 | return -EINVAL; |
173 | } | |
174 | } | |
175 | ||
176 | /* calculating trn. trn is something used to index into | |
177 | the waveform. presumably selecting the right one for the | |
178 | desired temperature. it works out the offset of the first | |
179 | v that exceeds the specified temperature */ | |
180 | if ((sizeof(*wfm_hdr) + wfm_hdr->trc) > size) | |
181 | return -EINVAL; | |
182 | ||
183 | for (i = sizeof(*wfm_hdr); i <= sizeof(*wfm_hdr) + wfm_hdr->trc; i++) { | |
184 | if (mem[i] > t) { | |
185 | trn = i - sizeof(*wfm_hdr) - 1; | |
186 | break; | |
187 | } | |
188 | } | |
189 | ||
190 | /* check temperature range table checksum */ | |
191 | cksum_idx = sizeof(*wfm_hdr) + wfm_hdr->trc + 1; | |
192 | if (cksum_idx > size) | |
193 | return -EINVAL; | |
194 | cksum = calc_cksum(sizeof(*wfm_hdr), cksum_idx, mem); | |
195 | if (cksum != mem[cksum_idx]) { | |
28501336 | 196 | dev_err(dev, "Error: bad temperature range table cksum" |
de7c6d15 JK |
197 | " %x != %x\n", cksum, mem[cksum_idx]); |
198 | return -EINVAL; | |
199 | } | |
200 | ||
201 | /* check waveform mode table address checksum */ | |
d15c0a4d | 202 | wmta = get_unaligned_le32(wfm_hdr->wmta) & 0x00FFFFFF; |
de7c6d15 JK |
203 | cksum_idx = wmta + m*4 + 3; |
204 | if (cksum_idx > size) | |
205 | return -EINVAL; | |
206 | cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem); | |
207 | if (cksum != mem[cksum_idx]) { | |
28501336 | 208 | dev_err(dev, "Error: bad mode table address cksum" |
de7c6d15 JK |
209 | " %x != %x\n", cksum, mem[cksum_idx]); |
210 | return -EINVAL; | |
211 | } | |
212 | ||
213 | /* check waveform temperature table address checksum */ | |
d15c0a4d | 214 | tta = get_unaligned_le32(mem + wmta + m * 4) & 0x00FFFFFF; |
de7c6d15 JK |
215 | cksum_idx = tta + trn*4 + 3; |
216 | if (cksum_idx > size) | |
217 | return -EINVAL; | |
218 | cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem); | |
219 | if (cksum != mem[cksum_idx]) { | |
28501336 | 220 | dev_err(dev, "Error: bad temperature table address cksum" |
de7c6d15 JK |
221 | " %x != %x\n", cksum, mem[cksum_idx]); |
222 | return -EINVAL; | |
223 | } | |
224 | ||
225 | /* here we do the real work of putting the waveform into the | |
226 | metromem buffer. this does runlength decoding of the waveform */ | |
d15c0a4d | 227 | wfm_idx = get_unaligned_le32(mem + tta + trn * 4) & 0x00FFFFFF; |
de7c6d15 JK |
228 | owfm_idx = wfm_idx; |
229 | if (wfm_idx > size) | |
230 | return -EINVAL; | |
231 | while (wfm_idx < size) { | |
232 | unsigned char rl; | |
233 | v = mem[wfm_idx++]; | |
234 | if (v == wfm_hdr->swtb) { | |
235 | while (((v = mem[wfm_idx++]) != wfm_hdr->swtb) && | |
236 | wfm_idx < size) | |
237 | metromem[mem_idx++] = v; | |
238 | ||
239 | continue; | |
240 | } | |
241 | ||
242 | if (v == wfm_hdr->endb) | |
243 | break; | |
244 | ||
245 | rl = mem[wfm_idx++]; | |
246 | for (i = 0; i <= rl; i++) | |
247 | metromem[mem_idx++] = v; | |
248 | } | |
249 | ||
250 | cksum_idx = wfm_idx; | |
251 | if (cksum_idx > size) | |
252 | return -EINVAL; | |
253 | cksum = calc_cksum(owfm_idx, cksum_idx, mem); | |
254 | if (cksum != mem[cksum_idx]) { | |
28501336 | 255 | dev_err(dev, "Error: bad waveform data cksum" |
de7c6d15 JK |
256 | " %x != %x\n", cksum, mem[cksum_idx]); |
257 | return -EINVAL; | |
258 | } | |
28501336 | 259 | par->frame_count = (mem_idx/64); |
de7c6d15 JK |
260 | |
261 | return 0; | |
262 | } | |
263 | ||
de7c6d15 JK |
264 | static int metronome_display_cmd(struct metronomefb_par *par) |
265 | { | |
266 | int i; | |
267 | u16 cs; | |
268 | u16 opcode; | |
269 | static u8 borderval; | |
270 | u8 *ptr; | |
271 | ||
272 | /* setup display command | |
273 | we can't immediately set the opcode since the controller | |
274 | will try parse the command before we've set it all up | |
275 | so we just set cs here and set the opcode at the end */ | |
276 | ||
277 | ptr = par->metromem; | |
278 | ||
279 | if (par->metromem_cmd->opcode == 0xCC40) | |
280 | opcode = cs = 0xCC41; | |
281 | else | |
282 | opcode = cs = 0xCC40; | |
283 | ||
284 | /* set the args ( 2 bytes ) for display */ | |
285 | i = 0; | |
286 | par->metromem_cmd->args[i] = 1 << 3 /* border update */ | |
287 | | ((borderval++ % 4) & 0x0F) << 4 | |
288 | | (par->frame_count - 1) << 8; | |
289 | cs += par->metromem_cmd->args[i++]; | |
290 | ||
291 | /* the rest are 0 */ | |
292 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); | |
293 | ||
294 | par->metromem_cmd->csum = cs; | |
295 | par->metromem_cmd->opcode = opcode; /* display cmd */ | |
296 | ||
03c33a4f | 297 | return par->board->met_wait_event_intr(par); |
de7c6d15 JK |
298 | } |
299 | ||
300 | static int __devinit metronome_powerup_cmd(struct metronomefb_par *par) | |
301 | { | |
302 | int i; | |
303 | u16 cs; | |
304 | ||
305 | /* setup power up command */ | |
306 | par->metromem_cmd->opcode = 0x1234; /* pwr up pseudo cmd */ | |
307 | cs = par->metromem_cmd->opcode; | |
308 | ||
309 | /* set pwr1,2,3 to 1024 */ | |
310 | for (i = 0; i < 3; i++) { | |
311 | par->metromem_cmd->args[i] = 1024; | |
312 | cs += par->metromem_cmd->args[i]; | |
313 | } | |
314 | ||
315 | /* the rest are 0 */ | |
316 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); | |
317 | ||
318 | par->metromem_cmd->csum = cs; | |
319 | ||
320 | msleep(1); | |
03c33a4f | 321 | par->board->set_rst(par, 1); |
de7c6d15 JK |
322 | |
323 | msleep(1); | |
03c33a4f | 324 | par->board->set_stdby(par, 1); |
de7c6d15 | 325 | |
03c33a4f | 326 | return par->board->met_wait_event(par); |
de7c6d15 JK |
327 | } |
328 | ||
329 | static int __devinit metronome_config_cmd(struct metronomefb_par *par) | |
330 | { | |
331 | int i; | |
332 | u16 cs; | |
333 | ||
334 | /* setup config command | |
335 | we can't immediately set the opcode since the controller | |
336 | will try parse the command before we've set it all up | |
337 | so we just set cs here and set the opcode at the end */ | |
338 | ||
339 | cs = 0xCC10; | |
340 | ||
341 | /* set the 12 args ( 8 bytes ) for config. see spec for meanings */ | |
342 | i = 0; | |
343 | par->metromem_cmd->args[i] = 15 /* sdlew */ | |
344 | | 2 << 8 /* sdosz */ | |
345 | | 0 << 11 /* sdor */ | |
346 | | 0 << 12 /* sdces */ | |
347 | | 0 << 15; /* sdcer */ | |
348 | cs += par->metromem_cmd->args[i++]; | |
349 | ||
350 | par->metromem_cmd->args[i] = 42 /* gdspl */ | |
351 | | 1 << 8 /* gdr1 */ | |
352 | | 1 << 9 /* sdshr */ | |
353 | | 0 << 15; /* gdspp */ | |
354 | cs += par->metromem_cmd->args[i++]; | |
355 | ||
356 | par->metromem_cmd->args[i] = 18 /* gdspw */ | |
357 | | 0 << 15; /* dispc */ | |
358 | cs += par->metromem_cmd->args[i++]; | |
359 | ||
360 | par->metromem_cmd->args[i] = 599 /* vdlc */ | |
361 | | 0 << 11 /* dsi */ | |
362 | | 0 << 12; /* dsic */ | |
363 | cs += par->metromem_cmd->args[i++]; | |
364 | ||
365 | /* the rest are 0 */ | |
366 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); | |
367 | ||
368 | par->metromem_cmd->csum = cs; | |
369 | par->metromem_cmd->opcode = 0xCC10; /* config cmd */ | |
370 | ||
03c33a4f | 371 | return par->board->met_wait_event(par); |
de7c6d15 JK |
372 | } |
373 | ||
374 | static int __devinit metronome_init_cmd(struct metronomefb_par *par) | |
375 | { | |
376 | int i; | |
377 | u16 cs; | |
378 | ||
379 | /* setup init command | |
380 | we can't immediately set the opcode since the controller | |
381 | will try parse the command before we've set it all up | |
382 | so we just set cs here and set the opcode at the end */ | |
383 | ||
384 | cs = 0xCC20; | |
385 | ||
386 | /* set the args ( 2 bytes ) for init */ | |
387 | i = 0; | |
388 | par->metromem_cmd->args[i] = 0; | |
389 | cs += par->metromem_cmd->args[i++]; | |
390 | ||
391 | /* the rest are 0 */ | |
392 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); | |
393 | ||
394 | par->metromem_cmd->csum = cs; | |
395 | par->metromem_cmd->opcode = 0xCC20; /* init cmd */ | |
396 | ||
03c33a4f | 397 | return par->board->met_wait_event(par); |
de7c6d15 JK |
398 | } |
399 | ||
400 | static int __devinit metronome_init_regs(struct metronomefb_par *par) | |
401 | { | |
402 | int res; | |
403 | ||
03c33a4f JK |
404 | par->board->init_gpio_regs(par); |
405 | ||
406 | par->board->init_lcdc_regs(par); | |
407 | ||
408 | /* now that lcd is setup, setup dma descriptor */ | |
409 | par->board->post_dma_setup(par); | |
de7c6d15 JK |
410 | |
411 | res = metronome_powerup_cmd(par); | |
412 | if (res) | |
413 | return res; | |
414 | ||
415 | res = metronome_config_cmd(par); | |
416 | if (res) | |
417 | return res; | |
418 | ||
419 | res = metronome_init_cmd(par); | |
de7c6d15 JK |
420 | |
421 | return res; | |
422 | } | |
423 | ||
424 | static void metronomefb_dpy_update(struct metronomefb_par *par) | |
425 | { | |
426 | u16 cksum; | |
427 | unsigned char *buf = (unsigned char __force *)par->info->screen_base; | |
428 | ||
429 | /* copy from vm to metromem */ | |
430 | memcpy(par->metromem_img, buf, DPY_W*DPY_H); | |
431 | ||
432 | cksum = calc_img_cksum((u16 *) par->metromem_img, | |
433 | (epd_frame_table[0].fw * DPY_H)/2); | |
03c33a4f | 434 | *((u16 *)(par->metromem_img) + |
de7c6d15 JK |
435 | (epd_frame_table[0].fw * DPY_H)/2) = cksum; |
436 | metronome_display_cmd(par); | |
437 | } | |
438 | ||
439 | static u16 metronomefb_dpy_update_page(struct metronomefb_par *par, int index) | |
440 | { | |
441 | int i; | |
442 | u16 csum = 0; | |
03c33a4f JK |
443 | u16 *buf = (u16 __force *)(par->info->screen_base + index); |
444 | u16 *img = (u16 *)(par->metromem_img + index); | |
de7c6d15 JK |
445 | |
446 | /* swizzle from vm to metromem and recalc cksum at the same time*/ | |
447 | for (i = 0; i < PAGE_SIZE/2; i++) { | |
448 | *(img + i) = (buf[i] << 5) & 0xE0E0; | |
449 | csum += *(img + i); | |
450 | } | |
451 | return csum; | |
452 | } | |
453 | ||
454 | /* this is called back from the deferred io workqueue */ | |
455 | static void metronomefb_dpy_deferred_io(struct fb_info *info, | |
456 | struct list_head *pagelist) | |
457 | { | |
458 | u16 cksum; | |
459 | struct page *cur; | |
460 | struct fb_deferred_io *fbdefio = info->fbdefio; | |
461 | struct metronomefb_par *par = info->par; | |
462 | ||
463 | /* walk the written page list and swizzle the data */ | |
464 | list_for_each_entry(cur, &fbdefio->pagelist, lru) { | |
465 | cksum = metronomefb_dpy_update_page(par, | |
466 | (cur->index << PAGE_SHIFT)); | |
467 | par->metromem_img_csum -= par->csum_table[cur->index]; | |
468 | par->csum_table[cur->index] = cksum; | |
469 | par->metromem_img_csum += cksum; | |
470 | } | |
471 | ||
472 | metronome_display_cmd(par); | |
473 | } | |
474 | ||
475 | static void metronomefb_fillrect(struct fb_info *info, | |
476 | const struct fb_fillrect *rect) | |
477 | { | |
478 | struct metronomefb_par *par = info->par; | |
479 | ||
555514fa | 480 | sys_fillrect(info, rect); |
de7c6d15 JK |
481 | metronomefb_dpy_update(par); |
482 | } | |
483 | ||
484 | static void metronomefb_copyarea(struct fb_info *info, | |
485 | const struct fb_copyarea *area) | |
486 | { | |
487 | struct metronomefb_par *par = info->par; | |
488 | ||
555514fa | 489 | sys_copyarea(info, area); |
de7c6d15 JK |
490 | metronomefb_dpy_update(par); |
491 | } | |
492 | ||
493 | static void metronomefb_imageblit(struct fb_info *info, | |
494 | const struct fb_image *image) | |
495 | { | |
496 | struct metronomefb_par *par = info->par; | |
497 | ||
555514fa | 498 | sys_imageblit(info, image); |
de7c6d15 JK |
499 | metronomefb_dpy_update(par); |
500 | } | |
501 | ||
502 | /* | |
503 | * this is the slow path from userspace. they can seek and write to | |
504 | * the fb. it is based on fb_sys_write | |
505 | */ | |
506 | static ssize_t metronomefb_write(struct fb_info *info, const char __user *buf, | |
507 | size_t count, loff_t *ppos) | |
508 | { | |
509 | struct metronomefb_par *par = info->par; | |
510 | unsigned long p = *ppos; | |
511 | void *dst; | |
512 | int err = 0; | |
513 | unsigned long total_size; | |
514 | ||
515 | if (info->state != FBINFO_STATE_RUNNING) | |
516 | return -EPERM; | |
517 | ||
518 | total_size = info->fix.smem_len; | |
519 | ||
520 | if (p > total_size) | |
521 | return -EFBIG; | |
522 | ||
523 | if (count > total_size) { | |
524 | err = -EFBIG; | |
525 | count = total_size; | |
526 | } | |
527 | ||
528 | if (count + p > total_size) { | |
529 | if (!err) | |
530 | err = -ENOSPC; | |
531 | ||
532 | count = total_size - p; | |
533 | } | |
534 | ||
03c33a4f | 535 | dst = (void __force *)(info->screen_base + p); |
de7c6d15 JK |
536 | |
537 | if (copy_from_user(dst, buf, count)) | |
538 | err = -EFAULT; | |
539 | ||
540 | if (!err) | |
541 | *ppos += count; | |
542 | ||
543 | metronomefb_dpy_update(par); | |
544 | ||
545 | return (err) ? err : count; | |
546 | } | |
547 | ||
548 | static struct fb_ops metronomefb_ops = { | |
549 | .owner = THIS_MODULE, | |
550 | .fb_write = metronomefb_write, | |
551 | .fb_fillrect = metronomefb_fillrect, | |
552 | .fb_copyarea = metronomefb_copyarea, | |
553 | .fb_imageblit = metronomefb_imageblit, | |
554 | }; | |
555 | ||
556 | static struct fb_deferred_io metronomefb_defio = { | |
557 | .delay = HZ, | |
558 | .deferred_io = metronomefb_dpy_deferred_io, | |
559 | }; | |
560 | ||
de7c6d15 JK |
561 | static int __devinit metronomefb_probe(struct platform_device *dev) |
562 | { | |
563 | struct fb_info *info; | |
03c33a4f | 564 | struct metronome_board *board; |
de7c6d15 JK |
565 | int retval = -ENOMEM; |
566 | int videomemorysize; | |
567 | unsigned char *videomemory; | |
568 | struct metronomefb_par *par; | |
569 | const struct firmware *fw_entry; | |
570 | int cmd_size, wfm_size, img_size, padding_size, totalsize; | |
571 | int i; | |
572 | ||
03c33a4f JK |
573 | /* pick up board specific routines */ |
574 | board = dev->dev.platform_data; | |
575 | if (!board) | |
576 | return -EINVAL; | |
577 | ||
578 | /* try to count device specific driver, if can't, platform recalls */ | |
579 | if (!try_module_get(board->owner)) | |
580 | return -ENODEV; | |
581 | ||
de7c6d15 JK |
582 | /* we have two blocks of memory. |
583 | info->screen_base which is vm, and is the fb used by apps. | |
584 | par->metromem which is physically contiguous memory and | |
585 | contains the display controller commands, waveform, | |
586 | processed image data and padding. this is the data pulled | |
03c33a4f | 587 | by the device's LCD controller and pushed to Metronome */ |
de7c6d15 JK |
588 | |
589 | videomemorysize = (DPY_W*DPY_H); | |
590 | videomemory = vmalloc(videomemorysize); | |
591 | if (!videomemory) | |
03c33a4f | 592 | return -ENOMEM; |
de7c6d15 JK |
593 | |
594 | memset(videomemory, 0, videomemorysize); | |
595 | ||
596 | info = framebuffer_alloc(sizeof(struct metronomefb_par), &dev->dev); | |
597 | if (!info) | |
598 | goto err_vfree; | |
599 | ||
03c33a4f | 600 | info->screen_base = (char __force __iomem *)videomemory; |
de7c6d15 JK |
601 | info->fbops = &metronomefb_ops; |
602 | ||
603 | info->var = metronomefb_var; | |
604 | info->fix = metronomefb_fix; | |
605 | info->fix.smem_len = videomemorysize; | |
606 | par = info->par; | |
607 | par->info = info; | |
03c33a4f | 608 | par->board = board; |
de7c6d15 JK |
609 | init_waitqueue_head(&par->waitq); |
610 | ||
611 | /* this table caches per page csum values. */ | |
612 | par->csum_table = vmalloc(videomemorysize/PAGE_SIZE); | |
613 | if (!par->csum_table) | |
614 | goto err_csum_table; | |
615 | ||
616 | /* the metromem buffer is divided as follows: | |
617 | command | CRC | padding | |
618 | 16kb waveform data | CRC | padding | |
619 | image data | CRC | |
620 | and an extra 256 bytes for dma descriptors | |
621 | eg: IW=832 IH=622 WS=128 | |
622 | */ | |
623 | ||
624 | cmd_size = 1 * epd_frame_table[0].fw; | |
625 | wfm_size = ((16*1024 + 2 + epd_frame_table[0].fw - 1) | |
626 | / epd_frame_table[0].fw) * epd_frame_table[0].fw; | |
627 | img_size = epd_frame_table[0].fh * epd_frame_table[0].fw; | |
628 | padding_size = 4 * epd_frame_table[0].fw; | |
629 | totalsize = cmd_size + wfm_size + img_size + padding_size; | |
630 | par->metromemsize = PAGE_ALIGN(totalsize + 256); | |
631 | DPRINTK("desired memory size = %d\n", par->metromemsize); | |
632 | dev->dev.coherent_dma_mask = 0xffffffffull; | |
633 | par->metromem = dma_alloc_writecombine(&dev->dev, par->metromemsize, | |
634 | &par->metromem_dma, GFP_KERNEL); | |
635 | if (!par->metromem) { | |
636 | printk(KERN_ERR | |
637 | "metronomefb: unable to allocate dma buffer\n"); | |
638 | goto err_vfree; | |
639 | } | |
640 | ||
641 | info->fix.smem_start = par->metromem_dma; | |
642 | par->metromem_cmd = (struct metromem_cmd *) par->metromem; | |
643 | par->metromem_wfm = par->metromem + cmd_size; | |
644 | par->metromem_img = par->metromem + cmd_size + wfm_size; | |
645 | par->metromem_img_csum = (u16 *) (par->metromem_img + | |
646 | (epd_frame_table[0].fw * DPY_H)); | |
647 | DPRINTK("img offset=0x%x\n", cmd_size + wfm_size); | |
648 | par->metromem_desc = (struct metromem_desc *) (par->metromem + cmd_size | |
649 | + wfm_size + img_size + padding_size); | |
650 | par->metromem_desc_dma = par->metromem_dma + cmd_size + wfm_size | |
651 | + img_size + padding_size; | |
652 | ||
03c33a4f JK |
653 | /* load the waveform in. assume mode 3, temp 31 for now |
654 | a) request the waveform file from userspace | |
de7c6d15 | 655 | b) process waveform and decode into metromem */ |
03c33a4f | 656 | retval = request_firmware(&fw_entry, "metronome.wbf", &dev->dev); |
de7c6d15 | 657 | if (retval < 0) { |
28501336 | 658 | dev_err(&dev->dev, "Failed to get waveform\n"); |
de7c6d15 JK |
659 | goto err_dma_free; |
660 | } | |
661 | ||
28501336 JK |
662 | retval = load_waveform((u8 *) fw_entry->data, fw_entry->size, 3, 31, |
663 | par); | |
2422fbba | 664 | release_firmware(fw_entry); |
de7c6d15 | 665 | if (retval < 0) { |
28501336 | 666 | dev_err(&dev->dev, "Failed processing waveform\n"); |
2422fbba | 667 | goto err_dma_free; |
de7c6d15 | 668 | } |
de7c6d15 | 669 | |
03c33a4f | 670 | if (board->setup_irq(info)) |
2422fbba | 671 | goto err_dma_free; |
de7c6d15 JK |
672 | |
673 | retval = metronome_init_regs(par); | |
674 | if (retval < 0) | |
675 | goto err_free_irq; | |
676 | ||
677 | info->flags = FBINFO_FLAG_DEFAULT; | |
678 | ||
679 | info->fbdefio = &metronomefb_defio; | |
680 | fb_deferred_io_init(info); | |
681 | ||
682 | retval = fb_alloc_cmap(&info->cmap, 8, 0); | |
683 | if (retval < 0) { | |
28501336 | 684 | dev_err(&dev->dev, "Failed to allocate colormap\n"); |
de7c6d15 JK |
685 | goto err_fb_rel; |
686 | } | |
687 | ||
688 | /* set cmap */ | |
689 | for (i = 0; i < 8; i++) | |
690 | info->cmap.red[i] = (((2*i)+1)*(0xFFFF))/16; | |
691 | memcpy(info->cmap.green, info->cmap.red, sizeof(u16)*8); | |
692 | memcpy(info->cmap.blue, info->cmap.red, sizeof(u16)*8); | |
693 | ||
694 | retval = register_framebuffer(info); | |
695 | if (retval < 0) | |
696 | goto err_cmap; | |
697 | ||
698 | platform_set_drvdata(dev, info); | |
699 | ||
28501336 | 700 | dev_dbg(&dev->dev, |
de7c6d15 JK |
701 | "fb%d: Metronome frame buffer device, using %dK of video" |
702 | " memory\n", info->node, videomemorysize >> 10); | |
703 | ||
704 | return 0; | |
705 | ||
706 | err_cmap: | |
707 | fb_dealloc_cmap(&info->cmap); | |
708 | err_fb_rel: | |
709 | framebuffer_release(info); | |
710 | err_free_irq: | |
03c33a4f | 711 | board->free_irq(info); |
de7c6d15 JK |
712 | err_dma_free: |
713 | dma_free_writecombine(&dev->dev, par->metromemsize, par->metromem, | |
714 | par->metromem_dma); | |
715 | err_csum_table: | |
716 | vfree(par->csum_table); | |
717 | err_vfree: | |
718 | vfree(videomemory); | |
03c33a4f | 719 | module_put(board->owner); |
de7c6d15 JK |
720 | return retval; |
721 | } | |
722 | ||
723 | static int __devexit metronomefb_remove(struct platform_device *dev) | |
724 | { | |
725 | struct fb_info *info = platform_get_drvdata(dev); | |
726 | ||
727 | if (info) { | |
728 | struct metronomefb_par *par = info->par; | |
729 | fb_deferred_io_cleanup(info); | |
730 | dma_free_writecombine(&dev->dev, par->metromemsize, | |
731 | par->metromem, par->metromem_dma); | |
732 | fb_dealloc_cmap(&info->cmap); | |
733 | vfree(par->csum_table); | |
734 | unregister_framebuffer(info); | |
735 | vfree((void __force *)info->screen_base); | |
03c33a4f JK |
736 | par->board->free_irq(info); |
737 | module_put(par->board->owner); | |
de7c6d15 JK |
738 | framebuffer_release(info); |
739 | } | |
740 | return 0; | |
741 | } | |
742 | ||
743 | static struct platform_driver metronomefb_driver = { | |
744 | .probe = metronomefb_probe, | |
745 | .remove = metronomefb_remove, | |
746 | .driver = { | |
03c33a4f | 747 | .owner = THIS_MODULE, |
de7c6d15 JK |
748 | .name = "metronomefb", |
749 | }, | |
750 | }; | |
751 | ||
de7c6d15 JK |
752 | static int __init metronomefb_init(void) |
753 | { | |
03c33a4f | 754 | return platform_driver_register(&metronomefb_driver); |
de7c6d15 JK |
755 | } |
756 | ||
757 | static void __exit metronomefb_exit(void) | |
758 | { | |
de7c6d15 JK |
759 | platform_driver_unregister(&metronomefb_driver); |
760 | } | |
761 | ||
de7c6d15 JK |
762 | module_init(metronomefb_init); |
763 | module_exit(metronomefb_exit); | |
764 | ||
765 | MODULE_DESCRIPTION("fbdev driver for Metronome controller"); | |
766 | MODULE_AUTHOR("Jaya Kumar"); | |
767 | MODULE_LICENSE("GPL"); |