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. |
| 16 | * It was tested with an E-Ink 800x600 Vizplex EPD on a Gumstix Connex board |
| 17 | * using the Lyre interface board. |
| 18 | * |
| 19 | * General notes: |
| 20 | * - User must set metronomefb_enable=1 to enable it. |
| 21 | * - See Documentation/fb/metronomefb.txt for how metronome works. |
| 22 | */ |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/string.h> |
| 27 | #include <linux/mm.h> |
| 28 | #include <linux/slab.h> |
| 29 | #include <linux/vmalloc.h> |
| 30 | #include <linux/delay.h> |
| 31 | #include <linux/interrupt.h> |
| 32 | #include <linux/fb.h> |
| 33 | #include <linux/init.h> |
| 34 | #include <linux/platform_device.h> |
| 35 | #include <linux/list.h> |
| 36 | #include <linux/firmware.h> |
| 37 | #include <linux/dma-mapping.h> |
| 38 | #include <linux/uaccess.h> |
| 39 | #include <linux/irq.h> |
| 40 | |
| 41 | #include <asm/arch/pxa-regs.h> |
| 42 | #include <asm/unaligned.h> |
| 43 | |
| 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 | |
| 56 | struct metromem_desc { |
| 57 | u32 mFDADR0; |
| 58 | u32 mFSADR0; |
| 59 | u32 mFIDR0; |
| 60 | u32 mLDCMD0; |
| 61 | }; |
| 62 | |
| 63 | struct metromem_cmd { |
| 64 | u16 opcode; |
| 65 | u16 args[((64-2)/2)]; |
| 66 | u16 csum; |
| 67 | }; |
| 68 | |
| 69 | struct metronomefb_par { |
| 70 | unsigned char *metromem; |
| 71 | struct metromem_desc *metromem_desc; |
| 72 | struct metromem_cmd *metromem_cmd; |
| 73 | unsigned char *metromem_wfm; |
| 74 | unsigned char *metromem_img; |
| 75 | u16 *metromem_img_csum; |
| 76 | u16 *csum_table; |
| 77 | int metromemsize; |
| 78 | dma_addr_t metromem_dma; |
| 79 | dma_addr_t metromem_desc_dma; |
| 80 | struct fb_info *info; |
| 81 | wait_queue_head_t waitq; |
| 82 | u8 frame_count; |
| 83 | }; |
| 84 | |
| 85 | /* frame differs from image. frame includes non-visible pixels */ |
| 86 | struct epd_frame { |
| 87 | int fw; /* frame width */ |
| 88 | int fh; /* frame height */ |
| 89 | }; |
| 90 | |
| 91 | static struct epd_frame epd_frame_table[] = { |
| 92 | { |
| 93 | .fw = 832, |
| 94 | .fh = 622 |
| 95 | }, |
| 96 | }; |
| 97 | |
| 98 | static struct fb_fix_screeninfo metronomefb_fix __devinitdata = { |
| 99 | .id = "metronomefb", |
| 100 | .type = FB_TYPE_PACKED_PIXELS, |
| 101 | .visual = FB_VISUAL_STATIC_PSEUDOCOLOR, |
| 102 | .xpanstep = 0, |
| 103 | .ypanstep = 0, |
| 104 | .ywrapstep = 0, |
| 105 | .line_length = DPY_W, |
| 106 | .accel = FB_ACCEL_NONE, |
| 107 | }; |
| 108 | |
| 109 | static struct fb_var_screeninfo metronomefb_var __devinitdata = { |
| 110 | .xres = DPY_W, |
| 111 | .yres = DPY_H, |
| 112 | .xres_virtual = DPY_W, |
| 113 | .yres_virtual = DPY_H, |
| 114 | .bits_per_pixel = 8, |
| 115 | .grayscale = 1, |
| 116 | .nonstd = 1, |
| 117 | .red = { 4, 3, 0 }, |
| 118 | .green = { 0, 0, 0 }, |
| 119 | .blue = { 0, 0, 0 }, |
| 120 | .transp = { 0, 0, 0 }, |
| 121 | }; |
| 122 | |
| 123 | static unsigned int metronomefb_enable; |
| 124 | |
| 125 | struct waveform_hdr { |
| 126 | u8 stuff[32]; |
| 127 | |
| 128 | u8 wmta[3]; |
| 129 | u8 fvsn; |
| 130 | |
| 131 | u8 luts; |
| 132 | u8 mc; |
| 133 | u8 trc; |
| 134 | u8 stuff3; |
| 135 | |
| 136 | u8 endb; |
| 137 | u8 swtb; |
| 138 | u8 stuff2a[2]; |
| 139 | |
| 140 | u8 stuff2b[3]; |
| 141 | u8 wfm_cs; |
| 142 | } __attribute__ ((packed)); |
| 143 | |
| 144 | /* main metronomefb functions */ |
| 145 | static u8 calc_cksum(int start, int end, u8 *mem) |
| 146 | { |
| 147 | u8 tmp = 0; |
| 148 | int i; |
| 149 | |
| 150 | for (i = start; i < end; i++) |
| 151 | tmp += mem[i]; |
| 152 | |
| 153 | return tmp; |
| 154 | } |
| 155 | |
| 156 | static u16 calc_img_cksum(u16 *start, int length) |
| 157 | { |
| 158 | u16 tmp = 0; |
| 159 | |
| 160 | while (length--) |
| 161 | tmp += *start++; |
| 162 | |
| 163 | return tmp; |
| 164 | } |
| 165 | |
| 166 | /* here we decode the incoming waveform file and populate metromem */ |
| 167 | #define EXP_WFORM_SIZE 47001 |
| 168 | static int load_waveform(u8 *mem, size_t size, u8 *metromem, int m, int t, |
| 169 | u8 *frame_count) |
| 170 | { |
| 171 | int tta; |
| 172 | int wmta; |
| 173 | int trn = 0; |
| 174 | int i; |
| 175 | unsigned char v; |
| 176 | u8 cksum; |
| 177 | int cksum_idx; |
| 178 | int wfm_idx, owfm_idx; |
| 179 | int mem_idx = 0; |
| 180 | struct waveform_hdr *wfm_hdr; |
| 181 | |
| 182 | if (size != EXP_WFORM_SIZE) { |
| 183 | printk(KERN_ERR "Error: unexpected size %d != %d\n", size, |
| 184 | EXP_WFORM_SIZE); |
| 185 | return -EINVAL; |
| 186 | } |
| 187 | |
| 188 | wfm_hdr = (struct waveform_hdr *) mem; |
| 189 | |
| 190 | if (wfm_hdr->fvsn != 1) { |
| 191 | printk(KERN_ERR "Error: bad fvsn %x\n", wfm_hdr->fvsn); |
| 192 | return -EINVAL; |
| 193 | } |
| 194 | if (wfm_hdr->luts != 0) { |
| 195 | printk(KERN_ERR "Error: bad luts %x\n", wfm_hdr->luts); |
| 196 | return -EINVAL; |
| 197 | } |
| 198 | cksum = calc_cksum(32, 47, mem); |
| 199 | if (cksum != wfm_hdr->wfm_cs) { |
| 200 | printk(KERN_ERR "Error: bad cksum %x != %x\n", cksum, |
| 201 | wfm_hdr->wfm_cs); |
| 202 | return -EINVAL; |
| 203 | } |
| 204 | wfm_hdr->mc += 1; |
| 205 | wfm_hdr->trc += 1; |
| 206 | for (i = 0; i < 5; i++) { |
| 207 | if (*(wfm_hdr->stuff2a + i) != 0) { |
| 208 | printk(KERN_ERR "Error: unexpected value in padding\n"); |
| 209 | return -EINVAL; |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | /* calculating trn. trn is something used to index into |
| 214 | the waveform. presumably selecting the right one for the |
| 215 | desired temperature. it works out the offset of the first |
| 216 | v that exceeds the specified temperature */ |
| 217 | if ((sizeof(*wfm_hdr) + wfm_hdr->trc) > size) |
| 218 | return -EINVAL; |
| 219 | |
| 220 | for (i = sizeof(*wfm_hdr); i <= sizeof(*wfm_hdr) + wfm_hdr->trc; i++) { |
| 221 | if (mem[i] > t) { |
| 222 | trn = i - sizeof(*wfm_hdr) - 1; |
| 223 | break; |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | /* check temperature range table checksum */ |
| 228 | cksum_idx = sizeof(*wfm_hdr) + wfm_hdr->trc + 1; |
| 229 | if (cksum_idx > size) |
| 230 | return -EINVAL; |
| 231 | cksum = calc_cksum(sizeof(*wfm_hdr), cksum_idx, mem); |
| 232 | if (cksum != mem[cksum_idx]) { |
| 233 | printk(KERN_ERR "Error: bad temperature range table cksum" |
| 234 | " %x != %x\n", cksum, mem[cksum_idx]); |
| 235 | return -EINVAL; |
| 236 | } |
| 237 | |
| 238 | /* check waveform mode table address checksum */ |
| 239 | wmta = le32_to_cpu(get_unaligned((__le32 *) wfm_hdr->wmta)); |
| 240 | wmta &= 0x00FFFFFF; |
| 241 | cksum_idx = wmta + m*4 + 3; |
| 242 | if (cksum_idx > size) |
| 243 | return -EINVAL; |
| 244 | cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem); |
| 245 | if (cksum != mem[cksum_idx]) { |
| 246 | printk(KERN_ERR "Error: bad mode table address cksum" |
| 247 | " %x != %x\n", cksum, mem[cksum_idx]); |
| 248 | return -EINVAL; |
| 249 | } |
| 250 | |
| 251 | /* check waveform temperature table address checksum */ |
| 252 | tta = le32_to_cpu(get_unaligned((int *) (mem + wmta + m*4))); |
| 253 | tta &= 0x00FFFFFF; |
| 254 | cksum_idx = tta + trn*4 + 3; |
| 255 | if (cksum_idx > size) |
| 256 | return -EINVAL; |
| 257 | cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem); |
| 258 | if (cksum != mem[cksum_idx]) { |
| 259 | printk(KERN_ERR "Error: bad temperature table address cksum" |
| 260 | " %x != %x\n", cksum, mem[cksum_idx]); |
| 261 | return -EINVAL; |
| 262 | } |
| 263 | |
| 264 | /* here we do the real work of putting the waveform into the |
| 265 | metromem buffer. this does runlength decoding of the waveform */ |
| 266 | wfm_idx = le32_to_cpu(get_unaligned((__le32 *) (mem + tta + trn*4))); |
| 267 | wfm_idx &= 0x00FFFFFF; |
| 268 | owfm_idx = wfm_idx; |
| 269 | if (wfm_idx > size) |
| 270 | return -EINVAL; |
| 271 | while (wfm_idx < size) { |
| 272 | unsigned char rl; |
| 273 | v = mem[wfm_idx++]; |
| 274 | if (v == wfm_hdr->swtb) { |
| 275 | while (((v = mem[wfm_idx++]) != wfm_hdr->swtb) && |
| 276 | wfm_idx < size) |
| 277 | metromem[mem_idx++] = v; |
| 278 | |
| 279 | continue; |
| 280 | } |
| 281 | |
| 282 | if (v == wfm_hdr->endb) |
| 283 | break; |
| 284 | |
| 285 | rl = mem[wfm_idx++]; |
| 286 | for (i = 0; i <= rl; i++) |
| 287 | metromem[mem_idx++] = v; |
| 288 | } |
| 289 | |
| 290 | cksum_idx = wfm_idx; |
| 291 | if (cksum_idx > size) |
| 292 | return -EINVAL; |
| 293 | cksum = calc_cksum(owfm_idx, cksum_idx, mem); |
| 294 | if (cksum != mem[cksum_idx]) { |
| 295 | printk(KERN_ERR "Error: bad waveform data cksum" |
| 296 | " %x != %x\n", cksum, mem[cksum_idx]); |
| 297 | return -EINVAL; |
| 298 | } |
| 299 | *frame_count = (mem_idx/64); |
| 300 | |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | /* register offsets for gpio control */ |
| 305 | #define LED_GPIO_PIN 51 |
| 306 | #define STDBY_GPIO_PIN 48 |
| 307 | #define RST_GPIO_PIN 49 |
| 308 | #define RDY_GPIO_PIN 32 |
| 309 | #define ERR_GPIO_PIN 17 |
| 310 | #define PCBPWR_GPIO_PIN 16 |
| 311 | |
| 312 | #define AF_SEL_GPIO_N 0x3 |
| 313 | #define GAFR0_U_OFFSET(pin) ((pin - 16) * 2) |
| 314 | #define GAFR1_L_OFFSET(pin) ((pin - 32) * 2) |
| 315 | #define GAFR1_U_OFFSET(pin) ((pin - 48) * 2) |
| 316 | #define GPDR1_OFFSET(pin) (pin - 32) |
| 317 | #define GPCR1_OFFSET(pin) (pin - 32) |
| 318 | #define GPSR1_OFFSET(pin) (pin - 32) |
| 319 | #define GPCR0_OFFSET(pin) (pin) |
| 320 | #define GPSR0_OFFSET(pin) (pin) |
| 321 | |
| 322 | static void metronome_set_gpio_output(int pin, int val) |
| 323 | { |
| 324 | u8 index; |
| 325 | |
| 326 | index = pin >> 4; |
| 327 | |
| 328 | switch (index) { |
| 329 | case 1: |
| 330 | if (val) |
| 331 | GPSR0 |= (1 << GPSR0_OFFSET(pin)); |
| 332 | else |
| 333 | GPCR0 |= (1 << GPCR0_OFFSET(pin)); |
| 334 | break; |
| 335 | case 2: |
| 336 | break; |
| 337 | case 3: |
| 338 | if (val) |
| 339 | GPSR1 |= (1 << GPSR1_OFFSET(pin)); |
| 340 | else |
| 341 | GPCR1 |= (1 << GPCR1_OFFSET(pin)); |
| 342 | break; |
| 343 | default: |
| 344 | printk(KERN_ERR "unimplemented\n"); |
| 345 | } |
| 346 | } |
| 347 | |
| 348 | static void __devinit metronome_init_gpio_pin(int pin, int dir) |
| 349 | { |
| 350 | u8 index; |
| 351 | /* dir 0 is output, 1 is input |
| 352 | - do 2 things here: |
| 353 | - set gpio alternate function to standard gpio |
| 354 | - set gpio direction to input or output */ |
| 355 | |
| 356 | index = pin >> 4; |
| 357 | switch (index) { |
| 358 | case 1: |
| 359 | GAFR0_U &= ~(AF_SEL_GPIO_N << GAFR0_U_OFFSET(pin)); |
| 360 | |
| 361 | if (dir) |
| 362 | GPDR0 &= ~(1 << pin); |
| 363 | else |
| 364 | GPDR0 |= (1 << pin); |
| 365 | break; |
| 366 | case 2: |
| 367 | GAFR1_L &= ~(AF_SEL_GPIO_N << GAFR1_L_OFFSET(pin)); |
| 368 | |
| 369 | if (dir) |
| 370 | GPDR1 &= ~(1 << GPDR1_OFFSET(pin)); |
| 371 | else |
| 372 | GPDR1 |= (1 << GPDR1_OFFSET(pin)); |
| 373 | break; |
| 374 | case 3: |
| 375 | GAFR1_U &= ~(AF_SEL_GPIO_N << GAFR1_U_OFFSET(pin)); |
| 376 | |
| 377 | if (dir) |
| 378 | GPDR1 &= ~(1 << GPDR1_OFFSET(pin)); |
| 379 | else |
| 380 | GPDR1 |= (1 << GPDR1_OFFSET(pin)); |
| 381 | break; |
| 382 | default: |
| 383 | printk(KERN_ERR "unimplemented\n"); |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | static void __devinit metronome_init_gpio_regs(void) |
| 388 | { |
| 389 | metronome_init_gpio_pin(LED_GPIO_PIN, 0); |
| 390 | metronome_set_gpio_output(LED_GPIO_PIN, 0); |
| 391 | |
| 392 | metronome_init_gpio_pin(STDBY_GPIO_PIN, 0); |
| 393 | metronome_set_gpio_output(STDBY_GPIO_PIN, 0); |
| 394 | |
| 395 | metronome_init_gpio_pin(RST_GPIO_PIN, 0); |
| 396 | metronome_set_gpio_output(RST_GPIO_PIN, 0); |
| 397 | |
| 398 | metronome_init_gpio_pin(RDY_GPIO_PIN, 1); |
| 399 | |
| 400 | metronome_init_gpio_pin(ERR_GPIO_PIN, 1); |
| 401 | |
| 402 | metronome_init_gpio_pin(PCBPWR_GPIO_PIN, 0); |
| 403 | metronome_set_gpio_output(PCBPWR_GPIO_PIN, 0); |
| 404 | } |
| 405 | |
| 406 | static void metronome_disable_lcd_controller(struct metronomefb_par *par) |
| 407 | { |
| 408 | LCSR = 0xffffffff; /* Clear LCD Status Register */ |
| 409 | LCCR0 |= LCCR0_DIS; /* Disable LCD Controller */ |
| 410 | |
| 411 | /* we reset and just wait for things to settle */ |
| 412 | msleep(200); |
| 413 | } |
| 414 | |
| 415 | static void metronome_enable_lcd_controller(struct metronomefb_par *par) |
| 416 | { |
| 417 | LCSR = 0xffffffff; |
| 418 | FDADR0 = par->metromem_desc_dma; |
| 419 | LCCR0 |= LCCR0_ENB; |
| 420 | } |
| 421 | |
| 422 | static void __devinit metronome_init_lcdc_regs(struct metronomefb_par *par) |
| 423 | { |
| 424 | /* here we do: |
| 425 | - disable the lcd controller |
| 426 | - setup lcd control registers |
| 427 | - setup dma descriptor |
| 428 | - reenable lcd controller |
| 429 | */ |
| 430 | |
| 431 | /* disable the lcd controller */ |
| 432 | metronome_disable_lcd_controller(par); |
| 433 | |
| 434 | /* setup lcd control registers */ |
| 435 | LCCR0 = LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM | LCCR0_PAS |
| 436 | | LCCR0_QDM | LCCR0_BM | LCCR0_OUM; |
| 437 | |
| 438 | LCCR1 = (epd_frame_table[0].fw/2 - 1) /* pixels per line */ |
| 439 | | (27 << 10) /* hsync pulse width - 1 */ |
| 440 | | (33 << 16) /* eol pixel count */ |
| 441 | | (33 << 24); /* bol pixel count */ |
| 442 | |
| 443 | LCCR2 = (epd_frame_table[0].fh - 1) /* lines per panel */ |
| 444 | | (24 << 10) /* vsync pulse width - 1 */ |
| 445 | | (2 << 16) /* eof pixel count */ |
| 446 | | (0 << 24); /* bof pixel count */ |
| 447 | |
| 448 | LCCR3 = 2 /* pixel clock divisor */ |
| 449 | | (24 << 8) /* AC Bias pin freq */ |
| 450 | | LCCR3_16BPP /* BPP */ |
| 451 | | LCCR3_PCP; /* PCP falling edge */ |
| 452 | |
| 453 | /* setup dma descriptor */ |
| 454 | par->metromem_desc->mFDADR0 = par->metromem_desc_dma; |
| 455 | par->metromem_desc->mFSADR0 = par->metromem_dma; |
| 456 | par->metromem_desc->mFIDR0 = 0; |
| 457 | par->metromem_desc->mLDCMD0 = epd_frame_table[0].fw |
| 458 | * epd_frame_table[0].fh; |
| 459 | /* reenable lcd controller */ |
| 460 | metronome_enable_lcd_controller(par); |
| 461 | } |
| 462 | |
| 463 | static int metronome_display_cmd(struct metronomefb_par *par) |
| 464 | { |
| 465 | int i; |
| 466 | u16 cs; |
| 467 | u16 opcode; |
| 468 | static u8 borderval; |
| 469 | u8 *ptr; |
| 470 | |
| 471 | /* setup display command |
| 472 | we can't immediately set the opcode since the controller |
| 473 | will try parse the command before we've set it all up |
| 474 | so we just set cs here and set the opcode at the end */ |
| 475 | |
| 476 | ptr = par->metromem; |
| 477 | |
| 478 | if (par->metromem_cmd->opcode == 0xCC40) |
| 479 | opcode = cs = 0xCC41; |
| 480 | else |
| 481 | opcode = cs = 0xCC40; |
| 482 | |
| 483 | /* set the args ( 2 bytes ) for display */ |
| 484 | i = 0; |
| 485 | par->metromem_cmd->args[i] = 1 << 3 /* border update */ |
| 486 | | ((borderval++ % 4) & 0x0F) << 4 |
| 487 | | (par->frame_count - 1) << 8; |
| 488 | cs += par->metromem_cmd->args[i++]; |
| 489 | |
| 490 | /* the rest are 0 */ |
| 491 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); |
| 492 | |
| 493 | par->metromem_cmd->csum = cs; |
| 494 | par->metromem_cmd->opcode = opcode; /* display cmd */ |
| 495 | |
| 496 | i = wait_event_interruptible_timeout(par->waitq, (GPLR1 & 0x01), HZ); |
| 497 | return i; |
| 498 | } |
| 499 | |
| 500 | static int __devinit metronome_powerup_cmd(struct metronomefb_par *par) |
| 501 | { |
| 502 | int i; |
| 503 | u16 cs; |
| 504 | |
| 505 | /* setup power up command */ |
| 506 | par->metromem_cmd->opcode = 0x1234; /* pwr up pseudo cmd */ |
| 507 | cs = par->metromem_cmd->opcode; |
| 508 | |
| 509 | /* set pwr1,2,3 to 1024 */ |
| 510 | for (i = 0; i < 3; i++) { |
| 511 | par->metromem_cmd->args[i] = 1024; |
| 512 | cs += par->metromem_cmd->args[i]; |
| 513 | } |
| 514 | |
| 515 | /* the rest are 0 */ |
| 516 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); |
| 517 | |
| 518 | par->metromem_cmd->csum = cs; |
| 519 | |
| 520 | msleep(1); |
| 521 | metronome_set_gpio_output(RST_GPIO_PIN, 1); |
| 522 | |
| 523 | msleep(1); |
| 524 | metronome_set_gpio_output(STDBY_GPIO_PIN, 1); |
| 525 | |
| 526 | i = wait_event_timeout(par->waitq, (GPLR1 & 0x01), HZ); |
| 527 | return i; |
| 528 | } |
| 529 | |
| 530 | static int __devinit metronome_config_cmd(struct metronomefb_par *par) |
| 531 | { |
| 532 | int i; |
| 533 | u16 cs; |
| 534 | |
| 535 | /* setup config command |
| 536 | we can't immediately set the opcode since the controller |
| 537 | will try parse the command before we've set it all up |
| 538 | so we just set cs here and set the opcode at the end */ |
| 539 | |
| 540 | cs = 0xCC10; |
| 541 | |
| 542 | /* set the 12 args ( 8 bytes ) for config. see spec for meanings */ |
| 543 | i = 0; |
| 544 | par->metromem_cmd->args[i] = 15 /* sdlew */ |
| 545 | | 2 << 8 /* sdosz */ |
| 546 | | 0 << 11 /* sdor */ |
| 547 | | 0 << 12 /* sdces */ |
| 548 | | 0 << 15; /* sdcer */ |
| 549 | cs += par->metromem_cmd->args[i++]; |
| 550 | |
| 551 | par->metromem_cmd->args[i] = 42 /* gdspl */ |
| 552 | | 1 << 8 /* gdr1 */ |
| 553 | | 1 << 9 /* sdshr */ |
| 554 | | 0 << 15; /* gdspp */ |
| 555 | cs += par->metromem_cmd->args[i++]; |
| 556 | |
| 557 | par->metromem_cmd->args[i] = 18 /* gdspw */ |
| 558 | | 0 << 15; /* dispc */ |
| 559 | cs += par->metromem_cmd->args[i++]; |
| 560 | |
| 561 | par->metromem_cmd->args[i] = 599 /* vdlc */ |
| 562 | | 0 << 11 /* dsi */ |
| 563 | | 0 << 12; /* dsic */ |
| 564 | cs += par->metromem_cmd->args[i++]; |
| 565 | |
| 566 | /* the rest are 0 */ |
| 567 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); |
| 568 | |
| 569 | par->metromem_cmd->csum = cs; |
| 570 | par->metromem_cmd->opcode = 0xCC10; /* config cmd */ |
| 571 | |
| 572 | i = wait_event_timeout(par->waitq, (GPLR1 & 0x01), HZ); |
| 573 | return i; |
| 574 | } |
| 575 | |
| 576 | static int __devinit metronome_init_cmd(struct metronomefb_par *par) |
| 577 | { |
| 578 | int i; |
| 579 | u16 cs; |
| 580 | |
| 581 | /* setup init command |
| 582 | we can't immediately set the opcode since the controller |
| 583 | will try parse the command before we've set it all up |
| 584 | so we just set cs here and set the opcode at the end */ |
| 585 | |
| 586 | cs = 0xCC20; |
| 587 | |
| 588 | /* set the args ( 2 bytes ) for init */ |
| 589 | i = 0; |
| 590 | par->metromem_cmd->args[i] = 0; |
| 591 | cs += par->metromem_cmd->args[i++]; |
| 592 | |
| 593 | /* the rest are 0 */ |
| 594 | memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2); |
| 595 | |
| 596 | par->metromem_cmd->csum = cs; |
| 597 | par->metromem_cmd->opcode = 0xCC20; /* init cmd */ |
| 598 | |
| 599 | i = wait_event_timeout(par->waitq, (GPLR1 & 0x01), HZ); |
| 600 | return i; |
| 601 | } |
| 602 | |
| 603 | static int __devinit metronome_init_regs(struct metronomefb_par *par) |
| 604 | { |
| 605 | int res; |
| 606 | |
| 607 | metronome_init_gpio_regs(); |
| 608 | metronome_init_lcdc_regs(par); |
| 609 | |
| 610 | res = metronome_powerup_cmd(par); |
| 611 | if (res) |
| 612 | return res; |
| 613 | |
| 614 | res = metronome_config_cmd(par); |
| 615 | if (res) |
| 616 | return res; |
| 617 | |
| 618 | res = metronome_init_cmd(par); |
| 619 | if (res) |
| 620 | return res; |
| 621 | |
| 622 | return res; |
| 623 | } |
| 624 | |
| 625 | static void metronomefb_dpy_update(struct metronomefb_par *par) |
| 626 | { |
| 627 | u16 cksum; |
| 628 | unsigned char *buf = (unsigned char __force *)par->info->screen_base; |
| 629 | |
| 630 | /* copy from vm to metromem */ |
| 631 | memcpy(par->metromem_img, buf, DPY_W*DPY_H); |
| 632 | |
| 633 | cksum = calc_img_cksum((u16 *) par->metromem_img, |
| 634 | (epd_frame_table[0].fw * DPY_H)/2); |
| 635 | *((u16 *) (par->metromem_img) + |
| 636 | (epd_frame_table[0].fw * DPY_H)/2) = cksum; |
| 637 | metronome_display_cmd(par); |
| 638 | } |
| 639 | |
| 640 | static u16 metronomefb_dpy_update_page(struct metronomefb_par *par, int index) |
| 641 | { |
| 642 | int i; |
| 643 | u16 csum = 0; |
| 644 | u16 *buf = (u16 __force *) (par->info->screen_base + index); |
| 645 | u16 *img = (u16 *) (par->metromem_img + index); |
| 646 | |
| 647 | /* swizzle from vm to metromem and recalc cksum at the same time*/ |
| 648 | for (i = 0; i < PAGE_SIZE/2; i++) { |
| 649 | *(img + i) = (buf[i] << 5) & 0xE0E0; |
| 650 | csum += *(img + i); |
| 651 | } |
| 652 | return csum; |
| 653 | } |
| 654 | |
| 655 | /* this is called back from the deferred io workqueue */ |
| 656 | static void metronomefb_dpy_deferred_io(struct fb_info *info, |
| 657 | struct list_head *pagelist) |
| 658 | { |
| 659 | u16 cksum; |
| 660 | struct page *cur; |
| 661 | struct fb_deferred_io *fbdefio = info->fbdefio; |
| 662 | struct metronomefb_par *par = info->par; |
| 663 | |
| 664 | /* walk the written page list and swizzle the data */ |
| 665 | list_for_each_entry(cur, &fbdefio->pagelist, lru) { |
| 666 | cksum = metronomefb_dpy_update_page(par, |
| 667 | (cur->index << PAGE_SHIFT)); |
| 668 | par->metromem_img_csum -= par->csum_table[cur->index]; |
| 669 | par->csum_table[cur->index] = cksum; |
| 670 | par->metromem_img_csum += cksum; |
| 671 | } |
| 672 | |
| 673 | metronome_display_cmd(par); |
| 674 | } |
| 675 | |
| 676 | static void metronomefb_fillrect(struct fb_info *info, |
| 677 | const struct fb_fillrect *rect) |
| 678 | { |
| 679 | struct metronomefb_par *par = info->par; |
| 680 | |
| 681 | cfb_fillrect(info, rect); |
| 682 | metronomefb_dpy_update(par); |
| 683 | } |
| 684 | |
| 685 | static void metronomefb_copyarea(struct fb_info *info, |
| 686 | const struct fb_copyarea *area) |
| 687 | { |
| 688 | struct metronomefb_par *par = info->par; |
| 689 | |
| 690 | cfb_copyarea(info, area); |
| 691 | metronomefb_dpy_update(par); |
| 692 | } |
| 693 | |
| 694 | static void metronomefb_imageblit(struct fb_info *info, |
| 695 | const struct fb_image *image) |
| 696 | { |
| 697 | struct metronomefb_par *par = info->par; |
| 698 | |
| 699 | cfb_imageblit(info, image); |
| 700 | metronomefb_dpy_update(par); |
| 701 | } |
| 702 | |
| 703 | /* |
| 704 | * this is the slow path from userspace. they can seek and write to |
| 705 | * the fb. it is based on fb_sys_write |
| 706 | */ |
| 707 | static ssize_t metronomefb_write(struct fb_info *info, const char __user *buf, |
| 708 | size_t count, loff_t *ppos) |
| 709 | { |
| 710 | struct metronomefb_par *par = info->par; |
| 711 | unsigned long p = *ppos; |
| 712 | void *dst; |
| 713 | int err = 0; |
| 714 | unsigned long total_size; |
| 715 | |
| 716 | if (info->state != FBINFO_STATE_RUNNING) |
| 717 | return -EPERM; |
| 718 | |
| 719 | total_size = info->fix.smem_len; |
| 720 | |
| 721 | if (p > total_size) |
| 722 | return -EFBIG; |
| 723 | |
| 724 | if (count > total_size) { |
| 725 | err = -EFBIG; |
| 726 | count = total_size; |
| 727 | } |
| 728 | |
| 729 | if (count + p > total_size) { |
| 730 | if (!err) |
| 731 | err = -ENOSPC; |
| 732 | |
| 733 | count = total_size - p; |
| 734 | } |
| 735 | |
| 736 | dst = (void __force *) (info->screen_base + p); |
| 737 | |
| 738 | if (copy_from_user(dst, buf, count)) |
| 739 | err = -EFAULT; |
| 740 | |
| 741 | if (!err) |
| 742 | *ppos += count; |
| 743 | |
| 744 | metronomefb_dpy_update(par); |
| 745 | |
| 746 | return (err) ? err : count; |
| 747 | } |
| 748 | |
| 749 | static struct fb_ops metronomefb_ops = { |
| 750 | .owner = THIS_MODULE, |
| 751 | .fb_write = metronomefb_write, |
| 752 | .fb_fillrect = metronomefb_fillrect, |
| 753 | .fb_copyarea = metronomefb_copyarea, |
| 754 | .fb_imageblit = metronomefb_imageblit, |
| 755 | }; |
| 756 | |
| 757 | static struct fb_deferred_io metronomefb_defio = { |
| 758 | .delay = HZ, |
| 759 | .deferred_io = metronomefb_dpy_deferred_io, |
| 760 | }; |
| 761 | |
| 762 | static irqreturn_t metronome_handle_irq(int irq, void *dev_id) |
| 763 | { |
| 764 | struct fb_info *info = dev_id; |
| 765 | struct metronomefb_par *par = info->par; |
| 766 | |
| 767 | wake_up_interruptible(&par->waitq); |
| 768 | return IRQ_HANDLED; |
| 769 | } |
| 770 | |
| 771 | static int __devinit metronomefb_probe(struct platform_device *dev) |
| 772 | { |
| 773 | struct fb_info *info; |
| 774 | int retval = -ENOMEM; |
| 775 | int videomemorysize; |
| 776 | unsigned char *videomemory; |
| 777 | struct metronomefb_par *par; |
| 778 | const struct firmware *fw_entry; |
| 779 | int cmd_size, wfm_size, img_size, padding_size, totalsize; |
| 780 | int i; |
| 781 | |
| 782 | /* we have two blocks of memory. |
| 783 | info->screen_base which is vm, and is the fb used by apps. |
| 784 | par->metromem which is physically contiguous memory and |
| 785 | contains the display controller commands, waveform, |
| 786 | processed image data and padding. this is the data pulled |
| 787 | by the pxa255's LCD controller and pushed to Metronome */ |
| 788 | |
| 789 | videomemorysize = (DPY_W*DPY_H); |
| 790 | videomemory = vmalloc(videomemorysize); |
| 791 | if (!videomemory) |
| 792 | return retval; |
| 793 | |
| 794 | memset(videomemory, 0, videomemorysize); |
| 795 | |
| 796 | info = framebuffer_alloc(sizeof(struct metronomefb_par), &dev->dev); |
| 797 | if (!info) |
| 798 | goto err_vfree; |
| 799 | |
| 800 | info->screen_base = (char __iomem *) videomemory; |
| 801 | info->fbops = &metronomefb_ops; |
| 802 | |
| 803 | info->var = metronomefb_var; |
| 804 | info->fix = metronomefb_fix; |
| 805 | info->fix.smem_len = videomemorysize; |
| 806 | par = info->par; |
| 807 | par->info = info; |
| 808 | init_waitqueue_head(&par->waitq); |
| 809 | |
| 810 | /* this table caches per page csum values. */ |
| 811 | par->csum_table = vmalloc(videomemorysize/PAGE_SIZE); |
| 812 | if (!par->csum_table) |
| 813 | goto err_csum_table; |
| 814 | |
| 815 | /* the metromem buffer is divided as follows: |
| 816 | command | CRC | padding |
| 817 | 16kb waveform data | CRC | padding |
| 818 | image data | CRC |
| 819 | and an extra 256 bytes for dma descriptors |
| 820 | eg: IW=832 IH=622 WS=128 |
| 821 | */ |
| 822 | |
| 823 | cmd_size = 1 * epd_frame_table[0].fw; |
| 824 | wfm_size = ((16*1024 + 2 + epd_frame_table[0].fw - 1) |
| 825 | / epd_frame_table[0].fw) * epd_frame_table[0].fw; |
| 826 | img_size = epd_frame_table[0].fh * epd_frame_table[0].fw; |
| 827 | padding_size = 4 * epd_frame_table[0].fw; |
| 828 | totalsize = cmd_size + wfm_size + img_size + padding_size; |
| 829 | par->metromemsize = PAGE_ALIGN(totalsize + 256); |
| 830 | DPRINTK("desired memory size = %d\n", par->metromemsize); |
| 831 | dev->dev.coherent_dma_mask = 0xffffffffull; |
| 832 | par->metromem = dma_alloc_writecombine(&dev->dev, par->metromemsize, |
| 833 | &par->metromem_dma, GFP_KERNEL); |
| 834 | if (!par->metromem) { |
| 835 | printk(KERN_ERR |
| 836 | "metronomefb: unable to allocate dma buffer\n"); |
| 837 | goto err_vfree; |
| 838 | } |
| 839 | |
| 840 | info->fix.smem_start = par->metromem_dma; |
| 841 | par->metromem_cmd = (struct metromem_cmd *) par->metromem; |
| 842 | par->metromem_wfm = par->metromem + cmd_size; |
| 843 | par->metromem_img = par->metromem + cmd_size + wfm_size; |
| 844 | par->metromem_img_csum = (u16 *) (par->metromem_img + |
| 845 | (epd_frame_table[0].fw * DPY_H)); |
| 846 | DPRINTK("img offset=0x%x\n", cmd_size + wfm_size); |
| 847 | par->metromem_desc = (struct metromem_desc *) (par->metromem + cmd_size |
| 848 | + wfm_size + img_size + padding_size); |
| 849 | par->metromem_desc_dma = par->metromem_dma + cmd_size + wfm_size |
| 850 | + img_size + padding_size; |
| 851 | |
| 852 | /* load the waveform in. assume mode 3, temp 31 for now */ |
| 853 | /* a) request the waveform file from userspace |
| 854 | b) process waveform and decode into metromem */ |
| 855 | |
| 856 | retval = request_firmware(&fw_entry, "waveform.wbf", &dev->dev); |
| 857 | if (retval < 0) { |
| 858 | printk(KERN_ERR "metronomefb: couldn't get waveform\n"); |
| 859 | goto err_dma_free; |
| 860 | } |
| 861 | |
| 862 | retval = load_waveform((u8 *) fw_entry->data, fw_entry->size, |
| 863 | par->metromem_wfm, 3, 31, &par->frame_count); |
| 864 | if (retval < 0) { |
| 865 | printk(KERN_ERR "metronomefb: couldn't process waveform\n"); |
| 866 | goto err_ld_wfm; |
| 867 | } |
| 868 | release_firmware(fw_entry); |
| 869 | |
| 870 | retval = request_irq(IRQ_GPIO(RDY_GPIO_PIN), metronome_handle_irq, |
| 871 | IRQF_DISABLED, "Metronome", info); |
| 872 | if (retval) { |
| 873 | dev_err(&dev->dev, "request_irq failed: %d\n", retval); |
| 874 | goto err_ld_wfm; |
| 875 | } |
| 876 | set_irq_type(IRQ_GPIO(RDY_GPIO_PIN), IRQT_FALLING); |
| 877 | |
| 878 | retval = metronome_init_regs(par); |
| 879 | if (retval < 0) |
| 880 | goto err_free_irq; |
| 881 | |
| 882 | info->flags = FBINFO_FLAG_DEFAULT; |
| 883 | |
| 884 | info->fbdefio = &metronomefb_defio; |
| 885 | fb_deferred_io_init(info); |
| 886 | |
| 887 | retval = fb_alloc_cmap(&info->cmap, 8, 0); |
| 888 | if (retval < 0) { |
| 889 | printk(KERN_ERR "Failed to allocate colormap\n"); |
| 890 | goto err_fb_rel; |
| 891 | } |
| 892 | |
| 893 | /* set cmap */ |
| 894 | for (i = 0; i < 8; i++) |
| 895 | info->cmap.red[i] = (((2*i)+1)*(0xFFFF))/16; |
| 896 | memcpy(info->cmap.green, info->cmap.red, sizeof(u16)*8); |
| 897 | memcpy(info->cmap.blue, info->cmap.red, sizeof(u16)*8); |
| 898 | |
| 899 | retval = register_framebuffer(info); |
| 900 | if (retval < 0) |
| 901 | goto err_cmap; |
| 902 | |
| 903 | platform_set_drvdata(dev, info); |
| 904 | |
| 905 | printk(KERN_INFO |
| 906 | "fb%d: Metronome frame buffer device, using %dK of video" |
| 907 | " memory\n", info->node, videomemorysize >> 10); |
| 908 | |
| 909 | return 0; |
| 910 | |
| 911 | err_cmap: |
| 912 | fb_dealloc_cmap(&info->cmap); |
| 913 | err_fb_rel: |
| 914 | framebuffer_release(info); |
| 915 | err_free_irq: |
| 916 | free_irq(IRQ_GPIO(RDY_GPIO_PIN), info); |
| 917 | err_ld_wfm: |
| 918 | release_firmware(fw_entry); |
| 919 | err_dma_free: |
| 920 | dma_free_writecombine(&dev->dev, par->metromemsize, par->metromem, |
| 921 | par->metromem_dma); |
| 922 | err_csum_table: |
| 923 | vfree(par->csum_table); |
| 924 | err_vfree: |
| 925 | vfree(videomemory); |
| 926 | return retval; |
| 927 | } |
| 928 | |
| 929 | static int __devexit metronomefb_remove(struct platform_device *dev) |
| 930 | { |
| 931 | struct fb_info *info = platform_get_drvdata(dev); |
| 932 | |
| 933 | if (info) { |
| 934 | struct metronomefb_par *par = info->par; |
| 935 | fb_deferred_io_cleanup(info); |
| 936 | dma_free_writecombine(&dev->dev, par->metromemsize, |
| 937 | par->metromem, par->metromem_dma); |
| 938 | fb_dealloc_cmap(&info->cmap); |
| 939 | vfree(par->csum_table); |
| 940 | unregister_framebuffer(info); |
| 941 | vfree((void __force *)info->screen_base); |
| 942 | free_irq(IRQ_GPIO(RDY_GPIO_PIN), info); |
| 943 | framebuffer_release(info); |
| 944 | } |
| 945 | return 0; |
| 946 | } |
| 947 | |
| 948 | static struct platform_driver metronomefb_driver = { |
| 949 | .probe = metronomefb_probe, |
| 950 | .remove = metronomefb_remove, |
| 951 | .driver = { |
| 952 | .name = "metronomefb", |
| 953 | }, |
| 954 | }; |
| 955 | |
| 956 | static struct platform_device *metronomefb_device; |
| 957 | |
| 958 | static int __init metronomefb_init(void) |
| 959 | { |
| 960 | int ret; |
| 961 | |
| 962 | if (!metronomefb_enable) { |
| 963 | printk(KERN_ERR |
| 964 | "Use metronomefb_enable to enable the device\n"); |
| 965 | return -ENXIO; |
| 966 | } |
| 967 | |
| 968 | ret = platform_driver_register(&metronomefb_driver); |
| 969 | if (!ret) { |
| 970 | metronomefb_device = platform_device_alloc("metronomefb", 0); |
| 971 | if (metronomefb_device) |
| 972 | ret = platform_device_add(metronomefb_device); |
| 973 | else |
| 974 | ret = -ENOMEM; |
| 975 | |
| 976 | if (ret) { |
| 977 | platform_device_put(metronomefb_device); |
| 978 | platform_driver_unregister(&metronomefb_driver); |
| 979 | } |
| 980 | } |
| 981 | return ret; |
| 982 | |
| 983 | } |
| 984 | |
| 985 | static void __exit metronomefb_exit(void) |
| 986 | { |
| 987 | platform_device_unregister(metronomefb_device); |
| 988 | platform_driver_unregister(&metronomefb_driver); |
| 989 | } |
| 990 | |
| 991 | module_param(metronomefb_enable, uint, 0); |
| 992 | MODULE_PARM_DESC(metronomefb_enable, "Enable communication with Metronome"); |
| 993 | |
| 994 | module_init(metronomefb_init); |
| 995 | module_exit(metronomefb_exit); |
| 996 | |
| 997 | MODULE_DESCRIPTION("fbdev driver for Metronome controller"); |
| 998 | MODULE_AUTHOR("Jaya Kumar"); |
| 999 | MODULE_LICENSE("GPL"); |