Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 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. |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 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 |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 19 | * |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 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 | |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 39 | #include <video/metronomefb.h> |
| 40 | |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 41 | #include <asm/unaligned.h> |
| 42 | |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 43 | |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 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 | |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 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 | |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 94 | /* the waveform structure that is coming from userspace firmware */ |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 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 */ |
| 209 | wmta = le32_to_cpu(get_unaligned((__le32 *) wfm_hdr->wmta)); |
| 210 | wmta &= 0x00FFFFFF; |
| 211 | cksum_idx = wmta + m*4 + 3; |
| 212 | if (cksum_idx > size) |
| 213 | return -EINVAL; |
| 214 | cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem); |
| 215 | if (cksum != mem[cksum_idx]) { |
| 216 | printk(KERN_ERR "Error: bad mode table address cksum" |
| 217 | " %x != %x\n", cksum, mem[cksum_idx]); |
| 218 | return -EINVAL; |
| 219 | } |
| 220 | |
| 221 | /* check waveform temperature table address checksum */ |
| 222 | tta = le32_to_cpu(get_unaligned((int *) (mem + wmta + m*4))); |
| 223 | tta &= 0x00FFFFFF; |
| 224 | cksum_idx = tta + trn*4 + 3; |
| 225 | if (cksum_idx > size) |
| 226 | return -EINVAL; |
| 227 | cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem); |
| 228 | if (cksum != mem[cksum_idx]) { |
| 229 | printk(KERN_ERR "Error: bad temperature table address cksum" |
| 230 | " %x != %x\n", cksum, mem[cksum_idx]); |
| 231 | return -EINVAL; |
| 232 | } |
| 233 | |
| 234 | /* here we do the real work of putting the waveform into the |
| 235 | metromem buffer. this does runlength decoding of the waveform */ |
| 236 | wfm_idx = le32_to_cpu(get_unaligned((__le32 *) (mem + tta + trn*4))); |
| 237 | wfm_idx &= 0x00FFFFFF; |
| 238 | owfm_idx = wfm_idx; |
| 239 | if (wfm_idx > size) |
| 240 | return -EINVAL; |
| 241 | while (wfm_idx < size) { |
| 242 | unsigned char rl; |
| 243 | v = mem[wfm_idx++]; |
| 244 | if (v == wfm_hdr->swtb) { |
| 245 | while (((v = mem[wfm_idx++]) != wfm_hdr->swtb) && |
| 246 | wfm_idx < size) |
| 247 | metromem[mem_idx++] = v; |
| 248 | |
| 249 | continue; |
| 250 | } |
| 251 | |
| 252 | if (v == wfm_hdr->endb) |
| 253 | break; |
| 254 | |
| 255 | rl = mem[wfm_idx++]; |
| 256 | for (i = 0; i <= rl; i++) |
| 257 | metromem[mem_idx++] = v; |
| 258 | } |
| 259 | |
| 260 | cksum_idx = wfm_idx; |
| 261 | if (cksum_idx > size) |
| 262 | return -EINVAL; |
| 263 | cksum = calc_cksum(owfm_idx, cksum_idx, mem); |
| 264 | if (cksum != mem[cksum_idx]) { |
| 265 | printk(KERN_ERR "Error: bad waveform data cksum" |
| 266 | " %x != %x\n", cksum, mem[cksum_idx]); |
| 267 | return -EINVAL; |
| 268 | } |
| 269 | *frame_count = (mem_idx/64); |
| 270 | |
| 271 | return 0; |
| 272 | } |
| 273 | |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 274 | static int metronome_display_cmd(struct metronomefb_par *par) |
| 275 | { |
| 276 | int i; |
| 277 | u16 cs; |
| 278 | u16 opcode; |
| 279 | static u8 borderval; |
| 280 | u8 *ptr; |
| 281 | |
| 282 | /* setup display command |
| 283 | we can't immediately set the opcode since the controller |
| 284 | will try parse the command before we've set it all up |
| 285 | so we just set cs here and set the opcode at the end */ |
| 286 | |
| 287 | ptr = par->metromem; |
| 288 | |
| 289 | if (par->metromem_cmd->opcode == 0xCC40) |
| 290 | opcode = cs = 0xCC41; |
| 291 | else |
| 292 | opcode = cs = 0xCC40; |
| 293 | |
| 294 | /* set the args ( 2 bytes ) for display */ |
| 295 | i = 0; |
| 296 | par->metromem_cmd->args[i] = 1 << 3 /* border update */ |
| 297 | | ((borderval++ % 4) & 0x0F) << 4 |
| 298 | | (par->frame_count - 1) << 8; |
| 299 | cs += par->metromem_cmd->args[i++]; |
| 300 | |
| 301 | /* the rest are 0 */ |
| 302 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); |
| 303 | |
| 304 | par->metromem_cmd->csum = cs; |
| 305 | par->metromem_cmd->opcode = opcode; /* display cmd */ |
| 306 | |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 307 | return par->board->met_wait_event_intr(par); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 308 | } |
| 309 | |
| 310 | static int __devinit metronome_powerup_cmd(struct metronomefb_par *par) |
| 311 | { |
| 312 | int i; |
| 313 | u16 cs; |
| 314 | |
| 315 | /* setup power up command */ |
| 316 | par->metromem_cmd->opcode = 0x1234; /* pwr up pseudo cmd */ |
| 317 | cs = par->metromem_cmd->opcode; |
| 318 | |
| 319 | /* set pwr1,2,3 to 1024 */ |
| 320 | for (i = 0; i < 3; i++) { |
| 321 | par->metromem_cmd->args[i] = 1024; |
| 322 | cs += par->metromem_cmd->args[i]; |
| 323 | } |
| 324 | |
| 325 | /* the rest are 0 */ |
| 326 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); |
| 327 | |
| 328 | par->metromem_cmd->csum = cs; |
| 329 | |
| 330 | msleep(1); |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 331 | par->board->set_rst(par, 1); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 332 | |
| 333 | msleep(1); |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 334 | par->board->set_stdby(par, 1); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 335 | |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 336 | return par->board->met_wait_event(par); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 337 | } |
| 338 | |
| 339 | static int __devinit metronome_config_cmd(struct metronomefb_par *par) |
| 340 | { |
| 341 | int i; |
| 342 | u16 cs; |
| 343 | |
| 344 | /* setup config command |
| 345 | we can't immediately set the opcode since the controller |
| 346 | will try parse the command before we've set it all up |
| 347 | so we just set cs here and set the opcode at the end */ |
| 348 | |
| 349 | cs = 0xCC10; |
| 350 | |
| 351 | /* set the 12 args ( 8 bytes ) for config. see spec for meanings */ |
| 352 | i = 0; |
| 353 | par->metromem_cmd->args[i] = 15 /* sdlew */ |
| 354 | | 2 << 8 /* sdosz */ |
| 355 | | 0 << 11 /* sdor */ |
| 356 | | 0 << 12 /* sdces */ |
| 357 | | 0 << 15; /* sdcer */ |
| 358 | cs += par->metromem_cmd->args[i++]; |
| 359 | |
| 360 | par->metromem_cmd->args[i] = 42 /* gdspl */ |
| 361 | | 1 << 8 /* gdr1 */ |
| 362 | | 1 << 9 /* sdshr */ |
| 363 | | 0 << 15; /* gdspp */ |
| 364 | cs += par->metromem_cmd->args[i++]; |
| 365 | |
| 366 | par->metromem_cmd->args[i] = 18 /* gdspw */ |
| 367 | | 0 << 15; /* dispc */ |
| 368 | cs += par->metromem_cmd->args[i++]; |
| 369 | |
| 370 | par->metromem_cmd->args[i] = 599 /* vdlc */ |
| 371 | | 0 << 11 /* dsi */ |
| 372 | | 0 << 12; /* dsic */ |
| 373 | cs += par->metromem_cmd->args[i++]; |
| 374 | |
| 375 | /* the rest are 0 */ |
| 376 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); |
| 377 | |
| 378 | par->metromem_cmd->csum = cs; |
| 379 | par->metromem_cmd->opcode = 0xCC10; /* config cmd */ |
| 380 | |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 381 | return par->board->met_wait_event(par); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 382 | } |
| 383 | |
| 384 | static int __devinit metronome_init_cmd(struct metronomefb_par *par) |
| 385 | { |
| 386 | int i; |
| 387 | u16 cs; |
| 388 | |
| 389 | /* setup init command |
| 390 | we can't immediately set the opcode since the controller |
| 391 | will try parse the command before we've set it all up |
| 392 | so we just set cs here and set the opcode at the end */ |
| 393 | |
| 394 | cs = 0xCC20; |
| 395 | |
| 396 | /* set the args ( 2 bytes ) for init */ |
| 397 | i = 0; |
| 398 | par->metromem_cmd->args[i] = 0; |
| 399 | cs += par->metromem_cmd->args[i++]; |
| 400 | |
| 401 | /* the rest are 0 */ |
| 402 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); |
| 403 | |
| 404 | par->metromem_cmd->csum = cs; |
| 405 | par->metromem_cmd->opcode = 0xCC20; /* init cmd */ |
| 406 | |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 407 | return par->board->met_wait_event(par); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 408 | } |
| 409 | |
| 410 | static int __devinit metronome_init_regs(struct metronomefb_par *par) |
| 411 | { |
| 412 | int res; |
| 413 | |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 414 | par->board->init_gpio_regs(par); |
| 415 | |
| 416 | par->board->init_lcdc_regs(par); |
| 417 | |
| 418 | /* now that lcd is setup, setup dma descriptor */ |
| 419 | par->board->post_dma_setup(par); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 420 | |
| 421 | res = metronome_powerup_cmd(par); |
| 422 | if (res) |
| 423 | return res; |
| 424 | |
| 425 | res = metronome_config_cmd(par); |
| 426 | if (res) |
| 427 | return res; |
| 428 | |
| 429 | res = metronome_init_cmd(par); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 430 | |
| 431 | return res; |
| 432 | } |
| 433 | |
| 434 | static void metronomefb_dpy_update(struct metronomefb_par *par) |
| 435 | { |
| 436 | u16 cksum; |
| 437 | unsigned char *buf = (unsigned char __force *)par->info->screen_base; |
| 438 | |
| 439 | /* copy from vm to metromem */ |
| 440 | memcpy(par->metromem_img, buf, DPY_W*DPY_H); |
| 441 | |
| 442 | cksum = calc_img_cksum((u16 *) par->metromem_img, |
| 443 | (epd_frame_table[0].fw * DPY_H)/2); |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 444 | *((u16 *)(par->metromem_img) + |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 445 | (epd_frame_table[0].fw * DPY_H)/2) = cksum; |
| 446 | metronome_display_cmd(par); |
| 447 | } |
| 448 | |
| 449 | static u16 metronomefb_dpy_update_page(struct metronomefb_par *par, int index) |
| 450 | { |
| 451 | int i; |
| 452 | u16 csum = 0; |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 453 | u16 *buf = (u16 __force *)(par->info->screen_base + index); |
| 454 | u16 *img = (u16 *)(par->metromem_img + index); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 455 | |
| 456 | /* swizzle from vm to metromem and recalc cksum at the same time*/ |
| 457 | for (i = 0; i < PAGE_SIZE/2; i++) { |
| 458 | *(img + i) = (buf[i] << 5) & 0xE0E0; |
| 459 | csum += *(img + i); |
| 460 | } |
| 461 | return csum; |
| 462 | } |
| 463 | |
| 464 | /* this is called back from the deferred io workqueue */ |
| 465 | static void metronomefb_dpy_deferred_io(struct fb_info *info, |
| 466 | struct list_head *pagelist) |
| 467 | { |
| 468 | u16 cksum; |
| 469 | struct page *cur; |
| 470 | struct fb_deferred_io *fbdefio = info->fbdefio; |
| 471 | struct metronomefb_par *par = info->par; |
| 472 | |
| 473 | /* walk the written page list and swizzle the data */ |
| 474 | list_for_each_entry(cur, &fbdefio->pagelist, lru) { |
| 475 | cksum = metronomefb_dpy_update_page(par, |
| 476 | (cur->index << PAGE_SHIFT)); |
| 477 | par->metromem_img_csum -= par->csum_table[cur->index]; |
| 478 | par->csum_table[cur->index] = cksum; |
| 479 | par->metromem_img_csum += cksum; |
| 480 | } |
| 481 | |
| 482 | metronome_display_cmd(par); |
| 483 | } |
| 484 | |
| 485 | static void metronomefb_fillrect(struct fb_info *info, |
| 486 | const struct fb_fillrect *rect) |
| 487 | { |
| 488 | struct metronomefb_par *par = info->par; |
| 489 | |
Jaya Kumar | 555514f | 2008-04-28 02:15:36 -0700 | [diff] [blame] | 490 | sys_fillrect(info, rect); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 491 | metronomefb_dpy_update(par); |
| 492 | } |
| 493 | |
| 494 | static void metronomefb_copyarea(struct fb_info *info, |
| 495 | const struct fb_copyarea *area) |
| 496 | { |
| 497 | struct metronomefb_par *par = info->par; |
| 498 | |
Jaya Kumar | 555514f | 2008-04-28 02:15:36 -0700 | [diff] [blame] | 499 | sys_copyarea(info, area); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 500 | metronomefb_dpy_update(par); |
| 501 | } |
| 502 | |
| 503 | static void metronomefb_imageblit(struct fb_info *info, |
| 504 | const struct fb_image *image) |
| 505 | { |
| 506 | struct metronomefb_par *par = info->par; |
| 507 | |
Jaya Kumar | 555514f | 2008-04-28 02:15:36 -0700 | [diff] [blame] | 508 | sys_imageblit(info, image); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 509 | metronomefb_dpy_update(par); |
| 510 | } |
| 511 | |
| 512 | /* |
| 513 | * this is the slow path from userspace. they can seek and write to |
| 514 | * the fb. it is based on fb_sys_write |
| 515 | */ |
| 516 | static ssize_t metronomefb_write(struct fb_info *info, const char __user *buf, |
| 517 | size_t count, loff_t *ppos) |
| 518 | { |
| 519 | struct metronomefb_par *par = info->par; |
| 520 | unsigned long p = *ppos; |
| 521 | void *dst; |
| 522 | int err = 0; |
| 523 | unsigned long total_size; |
| 524 | |
| 525 | if (info->state != FBINFO_STATE_RUNNING) |
| 526 | return -EPERM; |
| 527 | |
| 528 | total_size = info->fix.smem_len; |
| 529 | |
| 530 | if (p > total_size) |
| 531 | return -EFBIG; |
| 532 | |
| 533 | if (count > total_size) { |
| 534 | err = -EFBIG; |
| 535 | count = total_size; |
| 536 | } |
| 537 | |
| 538 | if (count + p > total_size) { |
| 539 | if (!err) |
| 540 | err = -ENOSPC; |
| 541 | |
| 542 | count = total_size - p; |
| 543 | } |
| 544 | |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 545 | dst = (void __force *)(info->screen_base + p); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 546 | |
| 547 | if (copy_from_user(dst, buf, count)) |
| 548 | err = -EFAULT; |
| 549 | |
| 550 | if (!err) |
| 551 | *ppos += count; |
| 552 | |
| 553 | metronomefb_dpy_update(par); |
| 554 | |
| 555 | return (err) ? err : count; |
| 556 | } |
| 557 | |
| 558 | static struct fb_ops metronomefb_ops = { |
| 559 | .owner = THIS_MODULE, |
| 560 | .fb_write = metronomefb_write, |
| 561 | .fb_fillrect = metronomefb_fillrect, |
| 562 | .fb_copyarea = metronomefb_copyarea, |
| 563 | .fb_imageblit = metronomefb_imageblit, |
| 564 | }; |
| 565 | |
| 566 | static struct fb_deferred_io metronomefb_defio = { |
| 567 | .delay = HZ, |
| 568 | .deferred_io = metronomefb_dpy_deferred_io, |
| 569 | }; |
| 570 | |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 571 | static int __devinit metronomefb_probe(struct platform_device *dev) |
| 572 | { |
| 573 | struct fb_info *info; |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 574 | struct metronome_board *board; |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 575 | int retval = -ENOMEM; |
| 576 | int videomemorysize; |
| 577 | unsigned char *videomemory; |
| 578 | struct metronomefb_par *par; |
| 579 | const struct firmware *fw_entry; |
| 580 | int cmd_size, wfm_size, img_size, padding_size, totalsize; |
| 581 | int i; |
| 582 | |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 583 | /* pick up board specific routines */ |
| 584 | board = dev->dev.platform_data; |
| 585 | if (!board) |
| 586 | return -EINVAL; |
| 587 | |
| 588 | /* try to count device specific driver, if can't, platform recalls */ |
| 589 | if (!try_module_get(board->owner)) |
| 590 | return -ENODEV; |
| 591 | |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 592 | /* we have two blocks of memory. |
| 593 | info->screen_base which is vm, and is the fb used by apps. |
| 594 | par->metromem which is physically contiguous memory and |
| 595 | contains the display controller commands, waveform, |
| 596 | processed image data and padding. this is the data pulled |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 597 | by the device's LCD controller and pushed to Metronome */ |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 598 | |
| 599 | videomemorysize = (DPY_W*DPY_H); |
| 600 | videomemory = vmalloc(videomemorysize); |
| 601 | if (!videomemory) |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 602 | return -ENOMEM; |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 603 | |
| 604 | memset(videomemory, 0, videomemorysize); |
| 605 | |
| 606 | info = framebuffer_alloc(sizeof(struct metronomefb_par), &dev->dev); |
| 607 | if (!info) |
| 608 | goto err_vfree; |
| 609 | |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 610 | info->screen_base = (char __force __iomem *)videomemory; |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 611 | info->fbops = &metronomefb_ops; |
| 612 | |
| 613 | info->var = metronomefb_var; |
| 614 | info->fix = metronomefb_fix; |
| 615 | info->fix.smem_len = videomemorysize; |
| 616 | par = info->par; |
| 617 | par->info = info; |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 618 | par->board = board; |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 619 | init_waitqueue_head(&par->waitq); |
| 620 | |
| 621 | /* this table caches per page csum values. */ |
| 622 | par->csum_table = vmalloc(videomemorysize/PAGE_SIZE); |
| 623 | if (!par->csum_table) |
| 624 | goto err_csum_table; |
| 625 | |
| 626 | /* the metromem buffer is divided as follows: |
| 627 | command | CRC | padding |
| 628 | 16kb waveform data | CRC | padding |
| 629 | image data | CRC |
| 630 | and an extra 256 bytes for dma descriptors |
| 631 | eg: IW=832 IH=622 WS=128 |
| 632 | */ |
| 633 | |
| 634 | cmd_size = 1 * epd_frame_table[0].fw; |
| 635 | wfm_size = ((16*1024 + 2 + epd_frame_table[0].fw - 1) |
| 636 | / epd_frame_table[0].fw) * epd_frame_table[0].fw; |
| 637 | img_size = epd_frame_table[0].fh * epd_frame_table[0].fw; |
| 638 | padding_size = 4 * epd_frame_table[0].fw; |
| 639 | totalsize = cmd_size + wfm_size + img_size + padding_size; |
| 640 | par->metromemsize = PAGE_ALIGN(totalsize + 256); |
| 641 | DPRINTK("desired memory size = %d\n", par->metromemsize); |
| 642 | dev->dev.coherent_dma_mask = 0xffffffffull; |
| 643 | par->metromem = dma_alloc_writecombine(&dev->dev, par->metromemsize, |
| 644 | &par->metromem_dma, GFP_KERNEL); |
| 645 | if (!par->metromem) { |
| 646 | printk(KERN_ERR |
| 647 | "metronomefb: unable to allocate dma buffer\n"); |
| 648 | goto err_vfree; |
| 649 | } |
| 650 | |
| 651 | info->fix.smem_start = par->metromem_dma; |
| 652 | par->metromem_cmd = (struct metromem_cmd *) par->metromem; |
| 653 | par->metromem_wfm = par->metromem + cmd_size; |
| 654 | par->metromem_img = par->metromem + cmd_size + wfm_size; |
| 655 | par->metromem_img_csum = (u16 *) (par->metromem_img + |
| 656 | (epd_frame_table[0].fw * DPY_H)); |
| 657 | DPRINTK("img offset=0x%x\n", cmd_size + wfm_size); |
| 658 | par->metromem_desc = (struct metromem_desc *) (par->metromem + cmd_size |
| 659 | + wfm_size + img_size + padding_size); |
| 660 | par->metromem_desc_dma = par->metromem_dma + cmd_size + wfm_size |
| 661 | + img_size + padding_size; |
| 662 | |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 663 | /* load the waveform in. assume mode 3, temp 31 for now |
| 664 | a) request the waveform file from userspace |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 665 | b) process waveform and decode into metromem */ |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 666 | retval = request_firmware(&fw_entry, "metronome.wbf", &dev->dev); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 667 | if (retval < 0) { |
| 668 | printk(KERN_ERR "metronomefb: couldn't get waveform\n"); |
| 669 | goto err_dma_free; |
| 670 | } |
| 671 | |
| 672 | retval = load_waveform((u8 *) fw_entry->data, fw_entry->size, |
| 673 | par->metromem_wfm, 3, 31, &par->frame_count); |
| 674 | if (retval < 0) { |
| 675 | printk(KERN_ERR "metronomefb: couldn't process waveform\n"); |
| 676 | goto err_ld_wfm; |
| 677 | } |
| 678 | release_firmware(fw_entry); |
| 679 | |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 680 | if (board->setup_irq(info)) |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 681 | goto err_ld_wfm; |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 682 | |
| 683 | retval = metronome_init_regs(par); |
| 684 | if (retval < 0) |
| 685 | goto err_free_irq; |
| 686 | |
| 687 | info->flags = FBINFO_FLAG_DEFAULT; |
| 688 | |
| 689 | info->fbdefio = &metronomefb_defio; |
| 690 | fb_deferred_io_init(info); |
| 691 | |
| 692 | retval = fb_alloc_cmap(&info->cmap, 8, 0); |
| 693 | if (retval < 0) { |
| 694 | printk(KERN_ERR "Failed to allocate colormap\n"); |
| 695 | goto err_fb_rel; |
| 696 | } |
| 697 | |
| 698 | /* set cmap */ |
| 699 | for (i = 0; i < 8; i++) |
| 700 | info->cmap.red[i] = (((2*i)+1)*(0xFFFF))/16; |
| 701 | memcpy(info->cmap.green, info->cmap.red, sizeof(u16)*8); |
| 702 | memcpy(info->cmap.blue, info->cmap.red, sizeof(u16)*8); |
| 703 | |
| 704 | retval = register_framebuffer(info); |
| 705 | if (retval < 0) |
| 706 | goto err_cmap; |
| 707 | |
| 708 | platform_set_drvdata(dev, info); |
| 709 | |
| 710 | printk(KERN_INFO |
| 711 | "fb%d: Metronome frame buffer device, using %dK of video" |
| 712 | " memory\n", info->node, videomemorysize >> 10); |
| 713 | |
| 714 | return 0; |
| 715 | |
| 716 | err_cmap: |
| 717 | fb_dealloc_cmap(&info->cmap); |
| 718 | err_fb_rel: |
| 719 | framebuffer_release(info); |
| 720 | err_free_irq: |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 721 | board->free_irq(info); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 722 | err_ld_wfm: |
| 723 | release_firmware(fw_entry); |
| 724 | err_dma_free: |
| 725 | dma_free_writecombine(&dev->dev, par->metromemsize, par->metromem, |
| 726 | par->metromem_dma); |
| 727 | err_csum_table: |
| 728 | vfree(par->csum_table); |
| 729 | err_vfree: |
| 730 | vfree(videomemory); |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 731 | module_put(board->owner); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 732 | return retval; |
| 733 | } |
| 734 | |
| 735 | static int __devexit metronomefb_remove(struct platform_device *dev) |
| 736 | { |
| 737 | struct fb_info *info = platform_get_drvdata(dev); |
| 738 | |
| 739 | if (info) { |
| 740 | struct metronomefb_par *par = info->par; |
| 741 | fb_deferred_io_cleanup(info); |
| 742 | dma_free_writecombine(&dev->dev, par->metromemsize, |
| 743 | par->metromem, par->metromem_dma); |
| 744 | fb_dealloc_cmap(&info->cmap); |
| 745 | vfree(par->csum_table); |
| 746 | unregister_framebuffer(info); |
| 747 | vfree((void __force *)info->screen_base); |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 748 | par->board->free_irq(info); |
| 749 | module_put(par->board->owner); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 750 | framebuffer_release(info); |
| 751 | } |
| 752 | return 0; |
| 753 | } |
| 754 | |
| 755 | static struct platform_driver metronomefb_driver = { |
| 756 | .probe = metronomefb_probe, |
| 757 | .remove = metronomefb_remove, |
| 758 | .driver = { |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 759 | .owner = THIS_MODULE, |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 760 | .name = "metronomefb", |
| 761 | }, |
| 762 | }; |
| 763 | |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 764 | static int __init metronomefb_init(void) |
| 765 | { |
Jaya Kumar | 03c33a4 | 2008-04-28 02:15:38 -0700 | [diff] [blame^] | 766 | return platform_driver_register(&metronomefb_driver); |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 767 | } |
| 768 | |
| 769 | static void __exit metronomefb_exit(void) |
| 770 | { |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 771 | platform_driver_unregister(&metronomefb_driver); |
| 772 | } |
| 773 | |
Jaya Kumar | de7c6d1 | 2008-03-19 17:01:10 -0700 | [diff] [blame] | 774 | module_init(metronomefb_init); |
| 775 | module_exit(metronomefb_exit); |
| 776 | |
| 777 | MODULE_DESCRIPTION("fbdev driver for Metronome controller"); |
| 778 | MODULE_AUTHOR("Jaya Kumar"); |
| 779 | MODULE_LICENSE("GPL"); |