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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 | ||
03c33a4f | 43 | |
de7c6d15 JK |
44 | #define DEBUG 1 |
45 | #ifdef DEBUG | |
46 | #define DPRINTK(f, a...) printk(KERN_DEBUG "%s: " f, __func__ , ## a) | |
47 | #else | |
48 | #define DPRINTK(f, a...) | |
49 | #endif | |
50 | ||
51 | ||
52 | /* Display specific information */ | |
53 | #define DPY_W 832 | |
54 | #define DPY_H 622 | |
55 | ||
de7c6d15 JK |
56 | /* frame differs from image. frame includes non-visible pixels */ |
57 | struct epd_frame { | |
58 | int fw; /* frame width */ | |
59 | int fh; /* frame height */ | |
60 | }; | |
61 | ||
62 | static struct epd_frame epd_frame_table[] = { | |
63 | { | |
64 | .fw = 832, | |
65 | .fh = 622 | |
66 | }, | |
67 | }; | |
68 | ||
69 | static struct fb_fix_screeninfo metronomefb_fix __devinitdata = { | |
70 | .id = "metronomefb", | |
71 | .type = FB_TYPE_PACKED_PIXELS, | |
72 | .visual = FB_VISUAL_STATIC_PSEUDOCOLOR, | |
73 | .xpanstep = 0, | |
74 | .ypanstep = 0, | |
75 | .ywrapstep = 0, | |
76 | .line_length = DPY_W, | |
77 | .accel = FB_ACCEL_NONE, | |
78 | }; | |
79 | ||
80 | static struct fb_var_screeninfo metronomefb_var __devinitdata = { | |
81 | .xres = DPY_W, | |
82 | .yres = DPY_H, | |
83 | .xres_virtual = DPY_W, | |
84 | .yres_virtual = DPY_H, | |
85 | .bits_per_pixel = 8, | |
86 | .grayscale = 1, | |
87 | .nonstd = 1, | |
88 | .red = { 4, 3, 0 }, | |
89 | .green = { 0, 0, 0 }, | |
90 | .blue = { 0, 0, 0 }, | |
91 | .transp = { 0, 0, 0 }, | |
92 | }; | |
93 | ||
03c33a4f | 94 | /* the waveform structure that is coming from userspace firmware */ |
de7c6d15 JK |
95 | struct waveform_hdr { |
96 | u8 stuff[32]; | |
97 | ||
98 | u8 wmta[3]; | |
99 | u8 fvsn; | |
100 | ||
101 | u8 luts; | |
102 | u8 mc; | |
103 | u8 trc; | |
104 | u8 stuff3; | |
105 | ||
106 | u8 endb; | |
107 | u8 swtb; | |
108 | u8 stuff2a[2]; | |
109 | ||
110 | u8 stuff2b[3]; | |
111 | u8 wfm_cs; | |
112 | } __attribute__ ((packed)); | |
113 | ||
114 | /* main metronomefb functions */ | |
115 | static u8 calc_cksum(int start, int end, u8 *mem) | |
116 | { | |
117 | u8 tmp = 0; | |
118 | int i; | |
119 | ||
120 | for (i = start; i < end; i++) | |
121 | tmp += mem[i]; | |
122 | ||
123 | return tmp; | |
124 | } | |
125 | ||
126 | static u16 calc_img_cksum(u16 *start, int length) | |
127 | { | |
128 | u16 tmp = 0; | |
129 | ||
130 | while (length--) | |
131 | tmp += *start++; | |
132 | ||
133 | return tmp; | |
134 | } | |
135 | ||
136 | /* here we decode the incoming waveform file and populate metromem */ | |
137 | #define EXP_WFORM_SIZE 47001 | |
138 | static int load_waveform(u8 *mem, size_t size, u8 *metromem, int m, int t, | |
139 | u8 *frame_count) | |
140 | { | |
141 | int tta; | |
142 | int wmta; | |
143 | int trn = 0; | |
144 | int i; | |
145 | unsigned char v; | |
146 | u8 cksum; | |
147 | int cksum_idx; | |
148 | int wfm_idx, owfm_idx; | |
149 | int mem_idx = 0; | |
150 | struct waveform_hdr *wfm_hdr; | |
151 | ||
152 | if (size != EXP_WFORM_SIZE) { | |
153 | printk(KERN_ERR "Error: unexpected size %d != %d\n", size, | |
154 | EXP_WFORM_SIZE); | |
155 | return -EINVAL; | |
156 | } | |
157 | ||
158 | wfm_hdr = (struct waveform_hdr *) mem; | |
159 | ||
160 | if (wfm_hdr->fvsn != 1) { | |
161 | printk(KERN_ERR "Error: bad fvsn %x\n", wfm_hdr->fvsn); | |
162 | return -EINVAL; | |
163 | } | |
164 | if (wfm_hdr->luts != 0) { | |
165 | printk(KERN_ERR "Error: bad luts %x\n", wfm_hdr->luts); | |
166 | return -EINVAL; | |
167 | } | |
168 | cksum = calc_cksum(32, 47, mem); | |
169 | if (cksum != wfm_hdr->wfm_cs) { | |
170 | printk(KERN_ERR "Error: bad cksum %x != %x\n", cksum, | |
171 | wfm_hdr->wfm_cs); | |
172 | return -EINVAL; | |
173 | } | |
174 | wfm_hdr->mc += 1; | |
175 | wfm_hdr->trc += 1; | |
176 | for (i = 0; i < 5; i++) { | |
177 | if (*(wfm_hdr->stuff2a + i) != 0) { | |
178 | printk(KERN_ERR "Error: unexpected value in padding\n"); | |
179 | return -EINVAL; | |
180 | } | |
181 | } | |
182 | ||
183 | /* calculating trn. trn is something used to index into | |
184 | the waveform. presumably selecting the right one for the | |
185 | desired temperature. it works out the offset of the first | |
186 | v that exceeds the specified temperature */ | |
187 | if ((sizeof(*wfm_hdr) + wfm_hdr->trc) > size) | |
188 | return -EINVAL; | |
189 | ||
190 | for (i = sizeof(*wfm_hdr); i <= sizeof(*wfm_hdr) + wfm_hdr->trc; i++) { | |
191 | if (mem[i] > t) { | |
192 | trn = i - sizeof(*wfm_hdr) - 1; | |
193 | break; | |
194 | } | |
195 | } | |
196 | ||
197 | /* check temperature range table checksum */ | |
198 | cksum_idx = sizeof(*wfm_hdr) + wfm_hdr->trc + 1; | |
199 | if (cksum_idx > size) | |
200 | return -EINVAL; | |
201 | cksum = calc_cksum(sizeof(*wfm_hdr), cksum_idx, mem); | |
202 | if (cksum != mem[cksum_idx]) { | |
203 | printk(KERN_ERR "Error: bad temperature range table cksum" | |
204 | " %x != %x\n", cksum, mem[cksum_idx]); | |
205 | return -EINVAL; | |
206 | } | |
207 | ||
208 | /* check waveform mode table address checksum */ | |
d15c0a4d | 209 | wmta = get_unaligned_le32(wfm_hdr->wmta) & 0x00FFFFFF; |
de7c6d15 JK |
210 | cksum_idx = wmta + m*4 + 3; |
211 | if (cksum_idx > size) | |
212 | return -EINVAL; | |
213 | cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem); | |
214 | if (cksum != mem[cksum_idx]) { | |
215 | printk(KERN_ERR "Error: bad mode table address cksum" | |
216 | " %x != %x\n", cksum, mem[cksum_idx]); | |
217 | return -EINVAL; | |
218 | } | |
219 | ||
220 | /* check waveform temperature table address checksum */ | |
d15c0a4d | 221 | tta = get_unaligned_le32(mem + wmta + m * 4) & 0x00FFFFFF; |
de7c6d15 JK |
222 | cksum_idx = tta + trn*4 + 3; |
223 | if (cksum_idx > size) | |
224 | return -EINVAL; | |
225 | cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem); | |
226 | if (cksum != mem[cksum_idx]) { | |
227 | printk(KERN_ERR "Error: bad temperature table address cksum" | |
228 | " %x != %x\n", cksum, mem[cksum_idx]); | |
229 | return -EINVAL; | |
230 | } | |
231 | ||
232 | /* here we do the real work of putting the waveform into the | |
233 | metromem buffer. this does runlength decoding of the waveform */ | |
d15c0a4d | 234 | wfm_idx = get_unaligned_le32(mem + tta + trn * 4) & 0x00FFFFFF; |
de7c6d15 JK |
235 | owfm_idx = wfm_idx; |
236 | if (wfm_idx > size) | |
237 | return -EINVAL; | |
238 | while (wfm_idx < size) { | |
239 | unsigned char rl; | |
240 | v = mem[wfm_idx++]; | |
241 | if (v == wfm_hdr->swtb) { | |
242 | while (((v = mem[wfm_idx++]) != wfm_hdr->swtb) && | |
243 | wfm_idx < size) | |
244 | metromem[mem_idx++] = v; | |
245 | ||
246 | continue; | |
247 | } | |
248 | ||
249 | if (v == wfm_hdr->endb) | |
250 | break; | |
251 | ||
252 | rl = mem[wfm_idx++]; | |
253 | for (i = 0; i <= rl; i++) | |
254 | metromem[mem_idx++] = v; | |
255 | } | |
256 | ||
257 | cksum_idx = wfm_idx; | |
258 | if (cksum_idx > size) | |
259 | return -EINVAL; | |
260 | cksum = calc_cksum(owfm_idx, cksum_idx, mem); | |
261 | if (cksum != mem[cksum_idx]) { | |
262 | printk(KERN_ERR "Error: bad waveform data cksum" | |
263 | " %x != %x\n", cksum, mem[cksum_idx]); | |
264 | return -EINVAL; | |
265 | } | |
266 | *frame_count = (mem_idx/64); | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
de7c6d15 JK |
271 | static int metronome_display_cmd(struct metronomefb_par *par) |
272 | { | |
273 | int i; | |
274 | u16 cs; | |
275 | u16 opcode; | |
276 | static u8 borderval; | |
277 | u8 *ptr; | |
278 | ||
279 | /* setup display command | |
280 | we can't immediately set the opcode since the controller | |
281 | will try parse the command before we've set it all up | |
282 | so we just set cs here and set the opcode at the end */ | |
283 | ||
284 | ptr = par->metromem; | |
285 | ||
286 | if (par->metromem_cmd->opcode == 0xCC40) | |
287 | opcode = cs = 0xCC41; | |
288 | else | |
289 | opcode = cs = 0xCC40; | |
290 | ||
291 | /* set the args ( 2 bytes ) for display */ | |
292 | i = 0; | |
293 | par->metromem_cmd->args[i] = 1 << 3 /* border update */ | |
294 | | ((borderval++ % 4) & 0x0F) << 4 | |
295 | | (par->frame_count - 1) << 8; | |
296 | cs += par->metromem_cmd->args[i++]; | |
297 | ||
298 | /* the rest are 0 */ | |
299 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); | |
300 | ||
301 | par->metromem_cmd->csum = cs; | |
302 | par->metromem_cmd->opcode = opcode; /* display cmd */ | |
303 | ||
03c33a4f | 304 | return par->board->met_wait_event_intr(par); |
de7c6d15 JK |
305 | } |
306 | ||
307 | static int __devinit metronome_powerup_cmd(struct metronomefb_par *par) | |
308 | { | |
309 | int i; | |
310 | u16 cs; | |
311 | ||
312 | /* setup power up command */ | |
313 | par->metromem_cmd->opcode = 0x1234; /* pwr up pseudo cmd */ | |
314 | cs = par->metromem_cmd->opcode; | |
315 | ||
316 | /* set pwr1,2,3 to 1024 */ | |
317 | for (i = 0; i < 3; i++) { | |
318 | par->metromem_cmd->args[i] = 1024; | |
319 | cs += par->metromem_cmd->args[i]; | |
320 | } | |
321 | ||
322 | /* the rest are 0 */ | |
323 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); | |
324 | ||
325 | par->metromem_cmd->csum = cs; | |
326 | ||
327 | msleep(1); | |
03c33a4f | 328 | par->board->set_rst(par, 1); |
de7c6d15 JK |
329 | |
330 | msleep(1); | |
03c33a4f | 331 | par->board->set_stdby(par, 1); |
de7c6d15 | 332 | |
03c33a4f | 333 | return par->board->met_wait_event(par); |
de7c6d15 JK |
334 | } |
335 | ||
336 | static int __devinit metronome_config_cmd(struct metronomefb_par *par) | |
337 | { | |
338 | int i; | |
339 | u16 cs; | |
340 | ||
341 | /* setup config command | |
342 | we can't immediately set the opcode since the controller | |
343 | will try parse the command before we've set it all up | |
344 | so we just set cs here and set the opcode at the end */ | |
345 | ||
346 | cs = 0xCC10; | |
347 | ||
348 | /* set the 12 args ( 8 bytes ) for config. see spec for meanings */ | |
349 | i = 0; | |
350 | par->metromem_cmd->args[i] = 15 /* sdlew */ | |
351 | | 2 << 8 /* sdosz */ | |
352 | | 0 << 11 /* sdor */ | |
353 | | 0 << 12 /* sdces */ | |
354 | | 0 << 15; /* sdcer */ | |
355 | cs += par->metromem_cmd->args[i++]; | |
356 | ||
357 | par->metromem_cmd->args[i] = 42 /* gdspl */ | |
358 | | 1 << 8 /* gdr1 */ | |
359 | | 1 << 9 /* sdshr */ | |
360 | | 0 << 15; /* gdspp */ | |
361 | cs += par->metromem_cmd->args[i++]; | |
362 | ||
363 | par->metromem_cmd->args[i] = 18 /* gdspw */ | |
364 | | 0 << 15; /* dispc */ | |
365 | cs += par->metromem_cmd->args[i++]; | |
366 | ||
367 | par->metromem_cmd->args[i] = 599 /* vdlc */ | |
368 | | 0 << 11 /* dsi */ | |
369 | | 0 << 12; /* dsic */ | |
370 | cs += par->metromem_cmd->args[i++]; | |
371 | ||
372 | /* the rest are 0 */ | |
373 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); | |
374 | ||
375 | par->metromem_cmd->csum = cs; | |
376 | par->metromem_cmd->opcode = 0xCC10; /* config cmd */ | |
377 | ||
03c33a4f | 378 | return par->board->met_wait_event(par); |
de7c6d15 JK |
379 | } |
380 | ||
381 | static int __devinit metronome_init_cmd(struct metronomefb_par *par) | |
382 | { | |
383 | int i; | |
384 | u16 cs; | |
385 | ||
386 | /* setup init command | |
387 | we can't immediately set the opcode since the controller | |
388 | will try parse the command before we've set it all up | |
389 | so we just set cs here and set the opcode at the end */ | |
390 | ||
391 | cs = 0xCC20; | |
392 | ||
393 | /* set the args ( 2 bytes ) for init */ | |
394 | i = 0; | |
395 | par->metromem_cmd->args[i] = 0; | |
396 | cs += par->metromem_cmd->args[i++]; | |
397 | ||
398 | /* the rest are 0 */ | |
399 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); | |
400 | ||
401 | par->metromem_cmd->csum = cs; | |
402 | par->metromem_cmd->opcode = 0xCC20; /* init cmd */ | |
403 | ||
03c33a4f | 404 | return par->board->met_wait_event(par); |
de7c6d15 JK |
405 | } |
406 | ||
407 | static int __devinit metronome_init_regs(struct metronomefb_par *par) | |
408 | { | |
409 | int res; | |
410 | ||
03c33a4f JK |
411 | par->board->init_gpio_regs(par); |
412 | ||
413 | par->board->init_lcdc_regs(par); | |
414 | ||
415 | /* now that lcd is setup, setup dma descriptor */ | |
416 | par->board->post_dma_setup(par); | |
de7c6d15 JK |
417 | |
418 | res = metronome_powerup_cmd(par); | |
419 | if (res) | |
420 | return res; | |
421 | ||
422 | res = metronome_config_cmd(par); | |
423 | if (res) | |
424 | return res; | |
425 | ||
426 | res = metronome_init_cmd(par); | |
de7c6d15 JK |
427 | |
428 | return res; | |
429 | } | |
430 | ||
431 | static void metronomefb_dpy_update(struct metronomefb_par *par) | |
432 | { | |
433 | u16 cksum; | |
434 | unsigned char *buf = (unsigned char __force *)par->info->screen_base; | |
435 | ||
436 | /* copy from vm to metromem */ | |
437 | memcpy(par->metromem_img, buf, DPY_W*DPY_H); | |
438 | ||
439 | cksum = calc_img_cksum((u16 *) par->metromem_img, | |
440 | (epd_frame_table[0].fw * DPY_H)/2); | |
03c33a4f | 441 | *((u16 *)(par->metromem_img) + |
de7c6d15 JK |
442 | (epd_frame_table[0].fw * DPY_H)/2) = cksum; |
443 | metronome_display_cmd(par); | |
444 | } | |
445 | ||
446 | static u16 metronomefb_dpy_update_page(struct metronomefb_par *par, int index) | |
447 | { | |
448 | int i; | |
449 | u16 csum = 0; | |
03c33a4f JK |
450 | u16 *buf = (u16 __force *)(par->info->screen_base + index); |
451 | u16 *img = (u16 *)(par->metromem_img + index); | |
de7c6d15 JK |
452 | |
453 | /* swizzle from vm to metromem and recalc cksum at the same time*/ | |
454 | for (i = 0; i < PAGE_SIZE/2; i++) { | |
455 | *(img + i) = (buf[i] << 5) & 0xE0E0; | |
456 | csum += *(img + i); | |
457 | } | |
458 | return csum; | |
459 | } | |
460 | ||
461 | /* this is called back from the deferred io workqueue */ | |
462 | static void metronomefb_dpy_deferred_io(struct fb_info *info, | |
463 | struct list_head *pagelist) | |
464 | { | |
465 | u16 cksum; | |
466 | struct page *cur; | |
467 | struct fb_deferred_io *fbdefio = info->fbdefio; | |
468 | struct metronomefb_par *par = info->par; | |
469 | ||
470 | /* walk the written page list and swizzle the data */ | |
471 | list_for_each_entry(cur, &fbdefio->pagelist, lru) { | |
472 | cksum = metronomefb_dpy_update_page(par, | |
473 | (cur->index << PAGE_SHIFT)); | |
474 | par->metromem_img_csum -= par->csum_table[cur->index]; | |
475 | par->csum_table[cur->index] = cksum; | |
476 | par->metromem_img_csum += cksum; | |
477 | } | |
478 | ||
479 | metronome_display_cmd(par); | |
480 | } | |
481 | ||
482 | static void metronomefb_fillrect(struct fb_info *info, | |
483 | const struct fb_fillrect *rect) | |
484 | { | |
485 | struct metronomefb_par *par = info->par; | |
486 | ||
555514fa | 487 | sys_fillrect(info, rect); |
de7c6d15 JK |
488 | metronomefb_dpy_update(par); |
489 | } | |
490 | ||
491 | static void metronomefb_copyarea(struct fb_info *info, | |
492 | const struct fb_copyarea *area) | |
493 | { | |
494 | struct metronomefb_par *par = info->par; | |
495 | ||
555514fa | 496 | sys_copyarea(info, area); |
de7c6d15 JK |
497 | metronomefb_dpy_update(par); |
498 | } | |
499 | ||
500 | static void metronomefb_imageblit(struct fb_info *info, | |
501 | const struct fb_image *image) | |
502 | { | |
503 | struct metronomefb_par *par = info->par; | |
504 | ||
555514fa | 505 | sys_imageblit(info, image); |
de7c6d15 JK |
506 | metronomefb_dpy_update(par); |
507 | } | |
508 | ||
509 | /* | |
510 | * this is the slow path from userspace. they can seek and write to | |
511 | * the fb. it is based on fb_sys_write | |
512 | */ | |
513 | static ssize_t metronomefb_write(struct fb_info *info, const char __user *buf, | |
514 | size_t count, loff_t *ppos) | |
515 | { | |
516 | struct metronomefb_par *par = info->par; | |
517 | unsigned long p = *ppos; | |
518 | void *dst; | |
519 | int err = 0; | |
520 | unsigned long total_size; | |
521 | ||
522 | if (info->state != FBINFO_STATE_RUNNING) | |
523 | return -EPERM; | |
524 | ||
525 | total_size = info->fix.smem_len; | |
526 | ||
527 | if (p > total_size) | |
528 | return -EFBIG; | |
529 | ||
530 | if (count > total_size) { | |
531 | err = -EFBIG; | |
532 | count = total_size; | |
533 | } | |
534 | ||
535 | if (count + p > total_size) { | |
536 | if (!err) | |
537 | err = -ENOSPC; | |
538 | ||
539 | count = total_size - p; | |
540 | } | |
541 | ||
03c33a4f | 542 | dst = (void __force *)(info->screen_base + p); |
de7c6d15 JK |
543 | |
544 | if (copy_from_user(dst, buf, count)) | |
545 | err = -EFAULT; | |
546 | ||
547 | if (!err) | |
548 | *ppos += count; | |
549 | ||
550 | metronomefb_dpy_update(par); | |
551 | ||
552 | return (err) ? err : count; | |
553 | } | |
554 | ||
555 | static struct fb_ops metronomefb_ops = { | |
556 | .owner = THIS_MODULE, | |
557 | .fb_write = metronomefb_write, | |
558 | .fb_fillrect = metronomefb_fillrect, | |
559 | .fb_copyarea = metronomefb_copyarea, | |
560 | .fb_imageblit = metronomefb_imageblit, | |
561 | }; | |
562 | ||
563 | static struct fb_deferred_io metronomefb_defio = { | |
564 | .delay = HZ, | |
565 | .deferred_io = metronomefb_dpy_deferred_io, | |
566 | }; | |
567 | ||
de7c6d15 JK |
568 | static int __devinit metronomefb_probe(struct platform_device *dev) |
569 | { | |
570 | struct fb_info *info; | |
03c33a4f | 571 | struct metronome_board *board; |
de7c6d15 JK |
572 | int retval = -ENOMEM; |
573 | int videomemorysize; | |
574 | unsigned char *videomemory; | |
575 | struct metronomefb_par *par; | |
576 | const struct firmware *fw_entry; | |
577 | int cmd_size, wfm_size, img_size, padding_size, totalsize; | |
578 | int i; | |
579 | ||
03c33a4f JK |
580 | /* pick up board specific routines */ |
581 | board = dev->dev.platform_data; | |
582 | if (!board) | |
583 | return -EINVAL; | |
584 | ||
585 | /* try to count device specific driver, if can't, platform recalls */ | |
586 | if (!try_module_get(board->owner)) | |
587 | return -ENODEV; | |
588 | ||
de7c6d15 JK |
589 | /* we have two blocks of memory. |
590 | info->screen_base which is vm, and is the fb used by apps. | |
591 | par->metromem which is physically contiguous memory and | |
592 | contains the display controller commands, waveform, | |
593 | processed image data and padding. this is the data pulled | |
03c33a4f | 594 | by the device's LCD controller and pushed to Metronome */ |
de7c6d15 JK |
595 | |
596 | videomemorysize = (DPY_W*DPY_H); | |
597 | videomemory = vmalloc(videomemorysize); | |
598 | if (!videomemory) | |
03c33a4f | 599 | return -ENOMEM; |
de7c6d15 JK |
600 | |
601 | memset(videomemory, 0, videomemorysize); | |
602 | ||
603 | info = framebuffer_alloc(sizeof(struct metronomefb_par), &dev->dev); | |
604 | if (!info) | |
605 | goto err_vfree; | |
606 | ||
03c33a4f | 607 | info->screen_base = (char __force __iomem *)videomemory; |
de7c6d15 JK |
608 | info->fbops = &metronomefb_ops; |
609 | ||
610 | info->var = metronomefb_var; | |
611 | info->fix = metronomefb_fix; | |
612 | info->fix.smem_len = videomemorysize; | |
613 | par = info->par; | |
614 | par->info = info; | |
03c33a4f | 615 | par->board = board; |
de7c6d15 JK |
616 | init_waitqueue_head(&par->waitq); |
617 | ||
618 | /* this table caches per page csum values. */ | |
619 | par->csum_table = vmalloc(videomemorysize/PAGE_SIZE); | |
620 | if (!par->csum_table) | |
621 | goto err_csum_table; | |
622 | ||
623 | /* the metromem buffer is divided as follows: | |
624 | command | CRC | padding | |
625 | 16kb waveform data | CRC | padding | |
626 | image data | CRC | |
627 | and an extra 256 bytes for dma descriptors | |
628 | eg: IW=832 IH=622 WS=128 | |
629 | */ | |
630 | ||
631 | cmd_size = 1 * epd_frame_table[0].fw; | |
632 | wfm_size = ((16*1024 + 2 + epd_frame_table[0].fw - 1) | |
633 | / epd_frame_table[0].fw) * epd_frame_table[0].fw; | |
634 | img_size = epd_frame_table[0].fh * epd_frame_table[0].fw; | |
635 | padding_size = 4 * epd_frame_table[0].fw; | |
636 | totalsize = cmd_size + wfm_size + img_size + padding_size; | |
637 | par->metromemsize = PAGE_ALIGN(totalsize + 256); | |
638 | DPRINTK("desired memory size = %d\n", par->metromemsize); | |
639 | dev->dev.coherent_dma_mask = 0xffffffffull; | |
640 | par->metromem = dma_alloc_writecombine(&dev->dev, par->metromemsize, | |
641 | &par->metromem_dma, GFP_KERNEL); | |
642 | if (!par->metromem) { | |
643 | printk(KERN_ERR | |
644 | "metronomefb: unable to allocate dma buffer\n"); | |
645 | goto err_vfree; | |
646 | } | |
647 | ||
648 | info->fix.smem_start = par->metromem_dma; | |
649 | par->metromem_cmd = (struct metromem_cmd *) par->metromem; | |
650 | par->metromem_wfm = par->metromem + cmd_size; | |
651 | par->metromem_img = par->metromem + cmd_size + wfm_size; | |
652 | par->metromem_img_csum = (u16 *) (par->metromem_img + | |
653 | (epd_frame_table[0].fw * DPY_H)); | |
654 | DPRINTK("img offset=0x%x\n", cmd_size + wfm_size); | |
655 | par->metromem_desc = (struct metromem_desc *) (par->metromem + cmd_size | |
656 | + wfm_size + img_size + padding_size); | |
657 | par->metromem_desc_dma = par->metromem_dma + cmd_size + wfm_size | |
658 | + img_size + padding_size; | |
659 | ||
03c33a4f JK |
660 | /* load the waveform in. assume mode 3, temp 31 for now |
661 | a) request the waveform file from userspace | |
de7c6d15 | 662 | b) process waveform and decode into metromem */ |
03c33a4f | 663 | retval = request_firmware(&fw_entry, "metronome.wbf", &dev->dev); |
de7c6d15 JK |
664 | if (retval < 0) { |
665 | printk(KERN_ERR "metronomefb: couldn't get waveform\n"); | |
666 | goto err_dma_free; | |
667 | } | |
668 | ||
669 | retval = load_waveform((u8 *) fw_entry->data, fw_entry->size, | |
670 | par->metromem_wfm, 3, 31, &par->frame_count); | |
2422fbba | 671 | release_firmware(fw_entry); |
de7c6d15 JK |
672 | if (retval < 0) { |
673 | printk(KERN_ERR "metronomefb: couldn't process waveform\n"); | |
2422fbba | 674 | goto err_dma_free; |
de7c6d15 | 675 | } |
de7c6d15 | 676 | |
03c33a4f | 677 | if (board->setup_irq(info)) |
2422fbba | 678 | goto err_dma_free; |
de7c6d15 JK |
679 | |
680 | retval = metronome_init_regs(par); | |
681 | if (retval < 0) | |
682 | goto err_free_irq; | |
683 | ||
684 | info->flags = FBINFO_FLAG_DEFAULT; | |
685 | ||
686 | info->fbdefio = &metronomefb_defio; | |
687 | fb_deferred_io_init(info); | |
688 | ||
689 | retval = fb_alloc_cmap(&info->cmap, 8, 0); | |
690 | if (retval < 0) { | |
691 | printk(KERN_ERR "Failed to allocate colormap\n"); | |
692 | goto err_fb_rel; | |
693 | } | |
694 | ||
695 | /* set cmap */ | |
696 | for (i = 0; i < 8; i++) | |
697 | info->cmap.red[i] = (((2*i)+1)*(0xFFFF))/16; | |
698 | memcpy(info->cmap.green, info->cmap.red, sizeof(u16)*8); | |
699 | memcpy(info->cmap.blue, info->cmap.red, sizeof(u16)*8); | |
700 | ||
701 | retval = register_framebuffer(info); | |
702 | if (retval < 0) | |
703 | goto err_cmap; | |
704 | ||
705 | platform_set_drvdata(dev, info); | |
706 | ||
707 | printk(KERN_INFO | |
708 | "fb%d: Metronome frame buffer device, using %dK of video" | |
709 | " memory\n", info->node, videomemorysize >> 10); | |
710 | ||
711 | return 0; | |
712 | ||
713 | err_cmap: | |
714 | fb_dealloc_cmap(&info->cmap); | |
715 | err_fb_rel: | |
716 | framebuffer_release(info); | |
717 | err_free_irq: | |
03c33a4f | 718 | board->free_irq(info); |
de7c6d15 JK |
719 | err_dma_free: |
720 | dma_free_writecombine(&dev->dev, par->metromemsize, par->metromem, | |
721 | par->metromem_dma); | |
722 | err_csum_table: | |
723 | vfree(par->csum_table); | |
724 | err_vfree: | |
725 | vfree(videomemory); | |
03c33a4f | 726 | module_put(board->owner); |
de7c6d15 JK |
727 | return retval; |
728 | } | |
729 | ||
730 | static int __devexit metronomefb_remove(struct platform_device *dev) | |
731 | { | |
732 | struct fb_info *info = platform_get_drvdata(dev); | |
733 | ||
734 | if (info) { | |
735 | struct metronomefb_par *par = info->par; | |
736 | fb_deferred_io_cleanup(info); | |
737 | dma_free_writecombine(&dev->dev, par->metromemsize, | |
738 | par->metromem, par->metromem_dma); | |
739 | fb_dealloc_cmap(&info->cmap); | |
740 | vfree(par->csum_table); | |
741 | unregister_framebuffer(info); | |
742 | vfree((void __force *)info->screen_base); | |
03c33a4f JK |
743 | par->board->free_irq(info); |
744 | module_put(par->board->owner); | |
de7c6d15 JK |
745 | framebuffer_release(info); |
746 | } | |
747 | return 0; | |
748 | } | |
749 | ||
750 | static struct platform_driver metronomefb_driver = { | |
751 | .probe = metronomefb_probe, | |
752 | .remove = metronomefb_remove, | |
753 | .driver = { | |
03c33a4f | 754 | .owner = THIS_MODULE, |
de7c6d15 JK |
755 | .name = "metronomefb", |
756 | }, | |
757 | }; | |
758 | ||
de7c6d15 JK |
759 | static int __init metronomefb_init(void) |
760 | { | |
03c33a4f | 761 | return platform_driver_register(&metronomefb_driver); |
de7c6d15 JK |
762 | } |
763 | ||
764 | static void __exit metronomefb_exit(void) | |
765 | { | |
de7c6d15 JK |
766 | platform_driver_unregister(&metronomefb_driver); |
767 | } | |
768 | ||
de7c6d15 JK |
769 | module_init(metronomefb_init); |
770 | module_exit(metronomefb_exit); | |
771 | ||
772 | MODULE_DESCRIPTION("fbdev driver for Metronome controller"); | |
773 | MODULE_AUTHOR("Jaya Kumar"); | |
774 | MODULE_LICENSE("GPL"); |