Rodolfo Giometti | 4e17e1d | 2008-11-12 13:27:12 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Silicon Labs C2 port core Linux support |
| 3 | * |
| 4 | * Copyright (c) 2007 Rodolfo Giometti <giometti@linux.it> |
| 5 | * Copyright (c) 2007 Eurotech S.p.A. <info@eurotech.it> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License version 2 as published by |
| 9 | * the Free Software Foundation |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/device.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <linux/err.h> |
| 17 | #include <linux/kernel.h> |
Vegard Nossum | c53bd2e | 2009-02-26 14:05:59 +0100 | [diff] [blame] | 18 | #include <linux/kmemcheck.h> |
Rodolfo Giometti | 4e17e1d | 2008-11-12 13:27:12 -0800 | [diff] [blame] | 19 | #include <linux/ctype.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/idr.h> |
Geert Uytterhoeven | fb75109 | 2008-11-14 08:54:46 +0100 | [diff] [blame] | 22 | #include <linux/sched.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 23 | #include <linux/slab.h> |
Rodolfo Giometti | 4e17e1d | 2008-11-12 13:27:12 -0800 | [diff] [blame] | 24 | |
| 25 | #include <linux/c2port.h> |
| 26 | |
| 27 | #define DRIVER_NAME "c2port" |
| 28 | #define DRIVER_VERSION "0.51.0" |
| 29 | |
| 30 | static DEFINE_SPINLOCK(c2port_idr_lock); |
| 31 | static DEFINE_IDR(c2port_idr); |
| 32 | |
| 33 | /* |
| 34 | * Local variables |
| 35 | */ |
| 36 | |
| 37 | static struct class *c2port_class; |
| 38 | |
| 39 | /* |
| 40 | * C2 registers & commands defines |
| 41 | */ |
| 42 | |
| 43 | /* C2 registers */ |
| 44 | #define C2PORT_DEVICEID 0x00 |
| 45 | #define C2PORT_REVID 0x01 |
| 46 | #define C2PORT_FPCTL 0x02 |
| 47 | #define C2PORT_FPDAT 0xB4 |
| 48 | |
| 49 | /* C2 interface commands */ |
| 50 | #define C2PORT_GET_VERSION 0x01 |
| 51 | #define C2PORT_DEVICE_ERASE 0x03 |
| 52 | #define C2PORT_BLOCK_READ 0x06 |
| 53 | #define C2PORT_BLOCK_WRITE 0x07 |
| 54 | #define C2PORT_PAGE_ERASE 0x08 |
| 55 | |
| 56 | /* C2 status return codes */ |
| 57 | #define C2PORT_INVALID_COMMAND 0x00 |
| 58 | #define C2PORT_COMMAND_FAILED 0x02 |
| 59 | #define C2PORT_COMMAND_OK 0x0d |
| 60 | |
| 61 | /* |
| 62 | * C2 port low level signal managements |
| 63 | */ |
| 64 | |
| 65 | static void c2port_reset(struct c2port_device *dev) |
| 66 | { |
| 67 | struct c2port_ops *ops = dev->ops; |
| 68 | |
| 69 | /* To reset the device we have to keep clock line low for at least |
| 70 | * 20us. |
| 71 | */ |
| 72 | local_irq_disable(); |
| 73 | ops->c2ck_set(dev, 0); |
| 74 | udelay(25); |
| 75 | ops->c2ck_set(dev, 1); |
| 76 | local_irq_enable(); |
| 77 | |
| 78 | udelay(1); |
| 79 | } |
| 80 | |
| 81 | static void c2port_strobe_ck(struct c2port_device *dev) |
| 82 | { |
| 83 | struct c2port_ops *ops = dev->ops; |
| 84 | |
| 85 | /* During hi-low-hi transition we disable local IRQs to avoid |
| 86 | * interructions since C2 port specification says that it must be |
| 87 | * shorter than 5us, otherwise the microcontroller may consider |
| 88 | * it as a reset signal! |
| 89 | */ |
| 90 | local_irq_disable(); |
| 91 | ops->c2ck_set(dev, 0); |
| 92 | udelay(1); |
| 93 | ops->c2ck_set(dev, 1); |
| 94 | local_irq_enable(); |
| 95 | |
| 96 | udelay(1); |
| 97 | } |
| 98 | |
| 99 | /* |
| 100 | * C2 port basic functions |
| 101 | */ |
| 102 | |
| 103 | static void c2port_write_ar(struct c2port_device *dev, u8 addr) |
| 104 | { |
| 105 | struct c2port_ops *ops = dev->ops; |
| 106 | int i; |
| 107 | |
| 108 | /* START field */ |
| 109 | c2port_strobe_ck(dev); |
| 110 | |
| 111 | /* INS field (11b, LSB first) */ |
| 112 | ops->c2d_dir(dev, 0); |
| 113 | ops->c2d_set(dev, 1); |
| 114 | c2port_strobe_ck(dev); |
| 115 | ops->c2d_set(dev, 1); |
| 116 | c2port_strobe_ck(dev); |
| 117 | |
| 118 | /* ADDRESS field */ |
| 119 | for (i = 0; i < 8; i++) { |
| 120 | ops->c2d_set(dev, addr & 0x01); |
| 121 | c2port_strobe_ck(dev); |
| 122 | |
| 123 | addr >>= 1; |
| 124 | } |
| 125 | |
| 126 | /* STOP field */ |
| 127 | ops->c2d_dir(dev, 1); |
| 128 | c2port_strobe_ck(dev); |
| 129 | } |
| 130 | |
| 131 | static int c2port_read_ar(struct c2port_device *dev, u8 *addr) |
| 132 | { |
| 133 | struct c2port_ops *ops = dev->ops; |
| 134 | int i; |
| 135 | |
| 136 | /* START field */ |
| 137 | c2port_strobe_ck(dev); |
| 138 | |
| 139 | /* INS field (10b, LSB first) */ |
| 140 | ops->c2d_dir(dev, 0); |
| 141 | ops->c2d_set(dev, 0); |
| 142 | c2port_strobe_ck(dev); |
| 143 | ops->c2d_set(dev, 1); |
| 144 | c2port_strobe_ck(dev); |
| 145 | |
| 146 | /* ADDRESS field */ |
| 147 | ops->c2d_dir(dev, 1); |
| 148 | *addr = 0; |
| 149 | for (i = 0; i < 8; i++) { |
| 150 | *addr >>= 1; /* shift in 8-bit ADDRESS field LSB first */ |
| 151 | |
| 152 | c2port_strobe_ck(dev); |
| 153 | if (ops->c2d_get(dev)) |
| 154 | *addr |= 0x80; |
| 155 | } |
| 156 | |
| 157 | /* STOP field */ |
| 158 | c2port_strobe_ck(dev); |
| 159 | |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | static int c2port_write_dr(struct c2port_device *dev, u8 data) |
| 164 | { |
| 165 | struct c2port_ops *ops = dev->ops; |
| 166 | int timeout, i; |
| 167 | |
| 168 | /* START field */ |
| 169 | c2port_strobe_ck(dev); |
| 170 | |
| 171 | /* INS field (01b, LSB first) */ |
| 172 | ops->c2d_dir(dev, 0); |
| 173 | ops->c2d_set(dev, 1); |
| 174 | c2port_strobe_ck(dev); |
| 175 | ops->c2d_set(dev, 0); |
| 176 | c2port_strobe_ck(dev); |
| 177 | |
| 178 | /* LENGTH field (00b, LSB first -> 1 byte) */ |
| 179 | ops->c2d_set(dev, 0); |
| 180 | c2port_strobe_ck(dev); |
| 181 | ops->c2d_set(dev, 0); |
| 182 | c2port_strobe_ck(dev); |
| 183 | |
| 184 | /* DATA field */ |
| 185 | for (i = 0; i < 8; i++) { |
| 186 | ops->c2d_set(dev, data & 0x01); |
| 187 | c2port_strobe_ck(dev); |
| 188 | |
| 189 | data >>= 1; |
| 190 | } |
| 191 | |
| 192 | /* WAIT field */ |
| 193 | ops->c2d_dir(dev, 1); |
| 194 | timeout = 20; |
| 195 | do { |
| 196 | c2port_strobe_ck(dev); |
| 197 | if (ops->c2d_get(dev)) |
| 198 | break; |
| 199 | |
| 200 | udelay(1); |
| 201 | } while (--timeout > 0); |
| 202 | if (timeout == 0) |
| 203 | return -EIO; |
| 204 | |
| 205 | /* STOP field */ |
| 206 | c2port_strobe_ck(dev); |
| 207 | |
| 208 | return 0; |
| 209 | } |
| 210 | |
| 211 | static int c2port_read_dr(struct c2port_device *dev, u8 *data) |
| 212 | { |
| 213 | struct c2port_ops *ops = dev->ops; |
| 214 | int timeout, i; |
| 215 | |
| 216 | /* START field */ |
| 217 | c2port_strobe_ck(dev); |
| 218 | |
| 219 | /* INS field (00b, LSB first) */ |
| 220 | ops->c2d_dir(dev, 0); |
| 221 | ops->c2d_set(dev, 0); |
| 222 | c2port_strobe_ck(dev); |
| 223 | ops->c2d_set(dev, 0); |
| 224 | c2port_strobe_ck(dev); |
| 225 | |
| 226 | /* LENGTH field (00b, LSB first -> 1 byte) */ |
| 227 | ops->c2d_set(dev, 0); |
| 228 | c2port_strobe_ck(dev); |
| 229 | ops->c2d_set(dev, 0); |
| 230 | c2port_strobe_ck(dev); |
| 231 | |
| 232 | /* WAIT field */ |
| 233 | ops->c2d_dir(dev, 1); |
| 234 | timeout = 20; |
| 235 | do { |
| 236 | c2port_strobe_ck(dev); |
| 237 | if (ops->c2d_get(dev)) |
| 238 | break; |
| 239 | |
| 240 | udelay(1); |
| 241 | } while (--timeout > 0); |
| 242 | if (timeout == 0) |
| 243 | return -EIO; |
| 244 | |
| 245 | /* DATA field */ |
| 246 | *data = 0; |
| 247 | for (i = 0; i < 8; i++) { |
| 248 | *data >>= 1; /* shift in 8-bit DATA field LSB first */ |
| 249 | |
| 250 | c2port_strobe_ck(dev); |
| 251 | if (ops->c2d_get(dev)) |
| 252 | *data |= 0x80; |
| 253 | } |
| 254 | |
| 255 | /* STOP field */ |
| 256 | c2port_strobe_ck(dev); |
| 257 | |
| 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | static int c2port_poll_in_busy(struct c2port_device *dev) |
| 262 | { |
| 263 | u8 addr; |
| 264 | int ret, timeout = 20; |
| 265 | |
| 266 | do { |
| 267 | ret = (c2port_read_ar(dev, &addr)); |
| 268 | if (ret < 0) |
| 269 | return -EIO; |
| 270 | |
| 271 | if (!(addr & 0x02)) |
| 272 | break; |
| 273 | |
| 274 | udelay(1); |
| 275 | } while (--timeout > 0); |
| 276 | if (timeout == 0) |
| 277 | return -EIO; |
| 278 | |
| 279 | return 0; |
| 280 | } |
| 281 | |
| 282 | static int c2port_poll_out_ready(struct c2port_device *dev) |
| 283 | { |
| 284 | u8 addr; |
| 285 | int ret, timeout = 10000; /* erase flash needs long time... */ |
| 286 | |
| 287 | do { |
| 288 | ret = (c2port_read_ar(dev, &addr)); |
| 289 | if (ret < 0) |
| 290 | return -EIO; |
| 291 | |
| 292 | if (addr & 0x01) |
| 293 | break; |
| 294 | |
| 295 | udelay(1); |
| 296 | } while (--timeout > 0); |
| 297 | if (timeout == 0) |
| 298 | return -EIO; |
| 299 | |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | /* |
| 304 | * sysfs methods |
| 305 | */ |
| 306 | |
| 307 | static ssize_t c2port_show_name(struct device *dev, |
| 308 | struct device_attribute *attr, char *buf) |
| 309 | { |
| 310 | struct c2port_device *c2dev = dev_get_drvdata(dev); |
| 311 | |
| 312 | return sprintf(buf, "%s\n", c2dev->name); |
| 313 | } |
| 314 | |
| 315 | static ssize_t c2port_show_flash_blocks_num(struct device *dev, |
| 316 | struct device_attribute *attr, char *buf) |
| 317 | { |
| 318 | struct c2port_device *c2dev = dev_get_drvdata(dev); |
| 319 | struct c2port_ops *ops = c2dev->ops; |
| 320 | |
| 321 | return sprintf(buf, "%d\n", ops->blocks_num); |
| 322 | } |
| 323 | |
| 324 | static ssize_t c2port_show_flash_block_size(struct device *dev, |
| 325 | struct device_attribute *attr, char *buf) |
| 326 | { |
| 327 | struct c2port_device *c2dev = dev_get_drvdata(dev); |
| 328 | struct c2port_ops *ops = c2dev->ops; |
| 329 | |
| 330 | return sprintf(buf, "%d\n", ops->block_size); |
| 331 | } |
| 332 | |
| 333 | static ssize_t c2port_show_flash_size(struct device *dev, |
| 334 | struct device_attribute *attr, char *buf) |
| 335 | { |
| 336 | struct c2port_device *c2dev = dev_get_drvdata(dev); |
| 337 | struct c2port_ops *ops = c2dev->ops; |
| 338 | |
| 339 | return sprintf(buf, "%d\n", ops->blocks_num * ops->block_size); |
| 340 | } |
| 341 | |
| 342 | static ssize_t c2port_show_access(struct device *dev, |
| 343 | struct device_attribute *attr, char *buf) |
| 344 | { |
| 345 | struct c2port_device *c2dev = dev_get_drvdata(dev); |
| 346 | |
| 347 | return sprintf(buf, "%d\n", c2dev->access); |
| 348 | } |
| 349 | |
| 350 | static ssize_t c2port_store_access(struct device *dev, |
| 351 | struct device_attribute *attr, |
| 352 | const char *buf, size_t count) |
| 353 | { |
| 354 | struct c2port_device *c2dev = dev_get_drvdata(dev); |
| 355 | struct c2port_ops *ops = c2dev->ops; |
| 356 | int status, ret; |
| 357 | |
| 358 | ret = sscanf(buf, "%d", &status); |
| 359 | if (ret != 1) |
| 360 | return -EINVAL; |
| 361 | |
| 362 | mutex_lock(&c2dev->mutex); |
| 363 | |
| 364 | c2dev->access = !!status; |
| 365 | |
| 366 | /* If access is "on" clock should be HIGH _before_ setting the line |
| 367 | * as output and data line should be set as INPUT anyway */ |
| 368 | if (c2dev->access) |
| 369 | ops->c2ck_set(c2dev, 1); |
| 370 | ops->access(c2dev, c2dev->access); |
| 371 | if (c2dev->access) |
| 372 | ops->c2d_dir(c2dev, 1); |
| 373 | |
| 374 | mutex_unlock(&c2dev->mutex); |
| 375 | |
| 376 | return count; |
| 377 | } |
| 378 | |
| 379 | static ssize_t c2port_store_reset(struct device *dev, |
| 380 | struct device_attribute *attr, |
| 381 | const char *buf, size_t count) |
| 382 | { |
| 383 | struct c2port_device *c2dev = dev_get_drvdata(dev); |
| 384 | |
| 385 | /* Check the device access status */ |
| 386 | if (!c2dev->access) |
| 387 | return -EBUSY; |
| 388 | |
| 389 | mutex_lock(&c2dev->mutex); |
| 390 | |
| 391 | c2port_reset(c2dev); |
| 392 | c2dev->flash_access = 0; |
| 393 | |
| 394 | mutex_unlock(&c2dev->mutex); |
| 395 | |
| 396 | return count; |
| 397 | } |
| 398 | |
| 399 | static ssize_t __c2port_show_dev_id(struct c2port_device *dev, char *buf) |
| 400 | { |
| 401 | u8 data; |
| 402 | int ret; |
| 403 | |
| 404 | /* Select DEVICEID register for C2 data register accesses */ |
| 405 | c2port_write_ar(dev, C2PORT_DEVICEID); |
| 406 | |
| 407 | /* Read and return the device ID register */ |
| 408 | ret = c2port_read_dr(dev, &data); |
| 409 | if (ret < 0) |
| 410 | return ret; |
| 411 | |
| 412 | return sprintf(buf, "%d\n", data); |
| 413 | } |
| 414 | |
| 415 | static ssize_t c2port_show_dev_id(struct device *dev, |
| 416 | struct device_attribute *attr, char *buf) |
| 417 | { |
| 418 | struct c2port_device *c2dev = dev_get_drvdata(dev); |
| 419 | ssize_t ret; |
| 420 | |
| 421 | /* Check the device access status */ |
| 422 | if (!c2dev->access) |
| 423 | return -EBUSY; |
| 424 | |
| 425 | mutex_lock(&c2dev->mutex); |
| 426 | ret = __c2port_show_dev_id(c2dev, buf); |
| 427 | mutex_unlock(&c2dev->mutex); |
| 428 | |
| 429 | if (ret < 0) |
| 430 | dev_err(dev, "cannot read from %s\n", c2dev->name); |
| 431 | |
| 432 | return ret; |
| 433 | } |
| 434 | |
| 435 | static ssize_t __c2port_show_rev_id(struct c2port_device *dev, char *buf) |
| 436 | { |
| 437 | u8 data; |
| 438 | int ret; |
| 439 | |
| 440 | /* Select REVID register for C2 data register accesses */ |
| 441 | c2port_write_ar(dev, C2PORT_REVID); |
| 442 | |
| 443 | /* Read and return the revision ID register */ |
| 444 | ret = c2port_read_dr(dev, &data); |
| 445 | if (ret < 0) |
| 446 | return ret; |
| 447 | |
| 448 | return sprintf(buf, "%d\n", data); |
| 449 | } |
| 450 | |
| 451 | static ssize_t c2port_show_rev_id(struct device *dev, |
| 452 | struct device_attribute *attr, char *buf) |
| 453 | { |
| 454 | struct c2port_device *c2dev = dev_get_drvdata(dev); |
| 455 | ssize_t ret; |
| 456 | |
| 457 | /* Check the device access status */ |
| 458 | if (!c2dev->access) |
| 459 | return -EBUSY; |
| 460 | |
| 461 | mutex_lock(&c2dev->mutex); |
| 462 | ret = __c2port_show_rev_id(c2dev, buf); |
| 463 | mutex_unlock(&c2dev->mutex); |
| 464 | |
| 465 | if (ret < 0) |
| 466 | dev_err(c2dev->dev, "cannot read from %s\n", c2dev->name); |
| 467 | |
| 468 | return ret; |
| 469 | } |
| 470 | |
| 471 | static ssize_t c2port_show_flash_access(struct device *dev, |
| 472 | struct device_attribute *attr, char *buf) |
| 473 | { |
| 474 | struct c2port_device *c2dev = dev_get_drvdata(dev); |
| 475 | |
| 476 | return sprintf(buf, "%d\n", c2dev->flash_access); |
| 477 | } |
| 478 | |
| 479 | static ssize_t __c2port_store_flash_access(struct c2port_device *dev, |
| 480 | int status) |
| 481 | { |
| 482 | int ret; |
| 483 | |
| 484 | /* Check the device access status */ |
| 485 | if (!dev->access) |
| 486 | return -EBUSY; |
| 487 | |
| 488 | dev->flash_access = !!status; |
| 489 | |
| 490 | /* If flash_access is off we have nothing to do... */ |
| 491 | if (dev->flash_access == 0) |
| 492 | return 0; |
| 493 | |
| 494 | /* Target the C2 flash programming control register for C2 data |
| 495 | * register access */ |
| 496 | c2port_write_ar(dev, C2PORT_FPCTL); |
| 497 | |
| 498 | /* Write the first keycode to enable C2 Flash programming */ |
| 499 | ret = c2port_write_dr(dev, 0x02); |
| 500 | if (ret < 0) |
| 501 | return ret; |
| 502 | |
| 503 | /* Write the second keycode to enable C2 Flash programming */ |
| 504 | ret = c2port_write_dr(dev, 0x01); |
| 505 | if (ret < 0) |
| 506 | return ret; |
| 507 | |
| 508 | /* Delay for at least 20ms to ensure the target is ready for |
| 509 | * C2 flash programming */ |
| 510 | mdelay(25); |
| 511 | |
| 512 | return 0; |
| 513 | } |
| 514 | |
| 515 | static ssize_t c2port_store_flash_access(struct device *dev, |
| 516 | struct device_attribute *attr, |
| 517 | const char *buf, size_t count) |
| 518 | { |
| 519 | struct c2port_device *c2dev = dev_get_drvdata(dev); |
| 520 | int status; |
| 521 | ssize_t ret; |
| 522 | |
| 523 | ret = sscanf(buf, "%d", &status); |
| 524 | if (ret != 1) |
| 525 | return -EINVAL; |
| 526 | |
| 527 | mutex_lock(&c2dev->mutex); |
| 528 | ret = __c2port_store_flash_access(c2dev, status); |
| 529 | mutex_unlock(&c2dev->mutex); |
| 530 | |
| 531 | if (ret < 0) { |
| 532 | dev_err(c2dev->dev, "cannot enable %s flash programming\n", |
| 533 | c2dev->name); |
| 534 | return ret; |
| 535 | } |
| 536 | |
| 537 | return count; |
| 538 | } |
| 539 | |
| 540 | static ssize_t __c2port_write_flash_erase(struct c2port_device *dev) |
| 541 | { |
| 542 | u8 status; |
| 543 | int ret; |
| 544 | |
| 545 | /* Target the C2 flash programming data register for C2 data register |
| 546 | * access. |
| 547 | */ |
| 548 | c2port_write_ar(dev, C2PORT_FPDAT); |
| 549 | |
| 550 | /* Send device erase command */ |
| 551 | c2port_write_dr(dev, C2PORT_DEVICE_ERASE); |
| 552 | |
| 553 | /* Wait for input acknowledge */ |
| 554 | ret = c2port_poll_in_busy(dev); |
| 555 | if (ret < 0) |
| 556 | return ret; |
| 557 | |
| 558 | /* Should check status before starting FLASH access sequence */ |
| 559 | |
| 560 | /* Wait for status information */ |
| 561 | ret = c2port_poll_out_ready(dev); |
| 562 | if (ret < 0) |
| 563 | return ret; |
| 564 | |
| 565 | /* Read flash programming interface status */ |
| 566 | ret = c2port_read_dr(dev, &status); |
| 567 | if (ret < 0) |
| 568 | return ret; |
| 569 | if (status != C2PORT_COMMAND_OK) |
| 570 | return -EBUSY; |
| 571 | |
| 572 | /* Send a three-byte arming sequence to enable the device erase. |
| 573 | * If the sequence is not received correctly, the command will be |
| 574 | * ignored. |
| 575 | * Sequence is: 0xde, 0xad, 0xa5. |
| 576 | */ |
| 577 | c2port_write_dr(dev, 0xde); |
| 578 | ret = c2port_poll_in_busy(dev); |
| 579 | if (ret < 0) |
| 580 | return ret; |
| 581 | c2port_write_dr(dev, 0xad); |
| 582 | ret = c2port_poll_in_busy(dev); |
| 583 | if (ret < 0) |
| 584 | return ret; |
| 585 | c2port_write_dr(dev, 0xa5); |
| 586 | ret = c2port_poll_in_busy(dev); |
| 587 | if (ret < 0) |
| 588 | return ret; |
| 589 | |
| 590 | ret = c2port_poll_out_ready(dev); |
| 591 | if (ret < 0) |
| 592 | return ret; |
| 593 | |
| 594 | return 0; |
| 595 | } |
| 596 | |
| 597 | static ssize_t c2port_store_flash_erase(struct device *dev, |
| 598 | struct device_attribute *attr, |
| 599 | const char *buf, size_t count) |
| 600 | { |
| 601 | struct c2port_device *c2dev = dev_get_drvdata(dev); |
| 602 | int ret; |
| 603 | |
| 604 | /* Check the device and flash access status */ |
| 605 | if (!c2dev->access || !c2dev->flash_access) |
| 606 | return -EBUSY; |
| 607 | |
| 608 | mutex_lock(&c2dev->mutex); |
| 609 | ret = __c2port_write_flash_erase(c2dev); |
| 610 | mutex_unlock(&c2dev->mutex); |
| 611 | |
| 612 | if (ret < 0) { |
| 613 | dev_err(c2dev->dev, "cannot erase %s flash\n", c2dev->name); |
| 614 | return ret; |
| 615 | } |
| 616 | |
| 617 | return count; |
| 618 | } |
| 619 | |
| 620 | static ssize_t __c2port_read_flash_data(struct c2port_device *dev, |
| 621 | char *buffer, loff_t offset, size_t count) |
| 622 | { |
| 623 | struct c2port_ops *ops = dev->ops; |
| 624 | u8 status, nread = 128; |
| 625 | int i, ret; |
| 626 | |
| 627 | /* Check for flash end */ |
| 628 | if (offset >= ops->block_size * ops->blocks_num) |
| 629 | return 0; |
| 630 | |
| 631 | if (ops->block_size * ops->blocks_num - offset < nread) |
| 632 | nread = ops->block_size * ops->blocks_num - offset; |
| 633 | if (count < nread) |
| 634 | nread = count; |
| 635 | if (nread == 0) |
| 636 | return nread; |
| 637 | |
| 638 | /* Target the C2 flash programming data register for C2 data register |
| 639 | * access */ |
| 640 | c2port_write_ar(dev, C2PORT_FPDAT); |
| 641 | |
| 642 | /* Send flash block read command */ |
| 643 | c2port_write_dr(dev, C2PORT_BLOCK_READ); |
| 644 | |
| 645 | /* Wait for input acknowledge */ |
| 646 | ret = c2port_poll_in_busy(dev); |
| 647 | if (ret < 0) |
| 648 | return ret; |
| 649 | |
| 650 | /* Should check status before starting FLASH access sequence */ |
| 651 | |
| 652 | /* Wait for status information */ |
| 653 | ret = c2port_poll_out_ready(dev); |
| 654 | if (ret < 0) |
| 655 | return ret; |
| 656 | |
| 657 | /* Read flash programming interface status */ |
| 658 | ret = c2port_read_dr(dev, &status); |
| 659 | if (ret < 0) |
| 660 | return ret; |
| 661 | if (status != C2PORT_COMMAND_OK) |
| 662 | return -EBUSY; |
| 663 | |
| 664 | /* Send address high byte */ |
| 665 | c2port_write_dr(dev, offset >> 8); |
| 666 | ret = c2port_poll_in_busy(dev); |
| 667 | if (ret < 0) |
| 668 | return ret; |
| 669 | |
| 670 | /* Send address low byte */ |
| 671 | c2port_write_dr(dev, offset & 0x00ff); |
| 672 | ret = c2port_poll_in_busy(dev); |
| 673 | if (ret < 0) |
| 674 | return ret; |
| 675 | |
| 676 | /* Send address block size */ |
| 677 | c2port_write_dr(dev, nread); |
| 678 | ret = c2port_poll_in_busy(dev); |
| 679 | if (ret < 0) |
| 680 | return ret; |
| 681 | |
| 682 | /* Should check status before reading FLASH block */ |
| 683 | |
| 684 | /* Wait for status information */ |
| 685 | ret = c2port_poll_out_ready(dev); |
| 686 | if (ret < 0) |
| 687 | return ret; |
| 688 | |
| 689 | /* Read flash programming interface status */ |
| 690 | ret = c2port_read_dr(dev, &status); |
| 691 | if (ret < 0) |
| 692 | return ret; |
| 693 | if (status != C2PORT_COMMAND_OK) |
| 694 | return -EBUSY; |
| 695 | |
| 696 | /* Read flash block */ |
| 697 | for (i = 0; i < nread; i++) { |
| 698 | ret = c2port_poll_out_ready(dev); |
| 699 | if (ret < 0) |
| 700 | return ret; |
| 701 | |
| 702 | ret = c2port_read_dr(dev, buffer+i); |
| 703 | if (ret < 0) |
| 704 | return ret; |
| 705 | } |
| 706 | |
| 707 | return nread; |
| 708 | } |
| 709 | |
| 710 | static ssize_t c2port_read_flash_data(struct kobject *kobj, |
| 711 | struct bin_attribute *attr, |
| 712 | char *buffer, loff_t offset, size_t count) |
| 713 | { |
| 714 | struct c2port_device *c2dev = |
| 715 | dev_get_drvdata(container_of(kobj, |
| 716 | struct device, kobj)); |
| 717 | ssize_t ret; |
| 718 | |
| 719 | /* Check the device and flash access status */ |
| 720 | if (!c2dev->access || !c2dev->flash_access) |
| 721 | return -EBUSY; |
| 722 | |
| 723 | mutex_lock(&c2dev->mutex); |
| 724 | ret = __c2port_read_flash_data(c2dev, buffer, offset, count); |
| 725 | mutex_unlock(&c2dev->mutex); |
| 726 | |
| 727 | if (ret < 0) |
| 728 | dev_err(c2dev->dev, "cannot read %s flash\n", c2dev->name); |
| 729 | |
| 730 | return ret; |
| 731 | } |
| 732 | |
| 733 | static ssize_t __c2port_write_flash_data(struct c2port_device *dev, |
| 734 | char *buffer, loff_t offset, size_t count) |
| 735 | { |
| 736 | struct c2port_ops *ops = dev->ops; |
| 737 | u8 status, nwrite = 128; |
| 738 | int i, ret; |
| 739 | |
| 740 | if (nwrite > count) |
| 741 | nwrite = count; |
| 742 | if (ops->block_size * ops->blocks_num - offset < nwrite) |
| 743 | nwrite = ops->block_size * ops->blocks_num - offset; |
| 744 | |
| 745 | /* Check for flash end */ |
| 746 | if (offset >= ops->block_size * ops->blocks_num) |
| 747 | return -EINVAL; |
| 748 | |
| 749 | /* Target the C2 flash programming data register for C2 data register |
| 750 | * access */ |
| 751 | c2port_write_ar(dev, C2PORT_FPDAT); |
| 752 | |
| 753 | /* Send flash block write command */ |
| 754 | c2port_write_dr(dev, C2PORT_BLOCK_WRITE); |
| 755 | |
| 756 | /* Wait for input acknowledge */ |
| 757 | ret = c2port_poll_in_busy(dev); |
| 758 | if (ret < 0) |
| 759 | return ret; |
| 760 | |
| 761 | /* Should check status before starting FLASH access sequence */ |
| 762 | |
| 763 | /* Wait for status information */ |
| 764 | ret = c2port_poll_out_ready(dev); |
| 765 | if (ret < 0) |
| 766 | return ret; |
| 767 | |
| 768 | /* Read flash programming interface status */ |
| 769 | ret = c2port_read_dr(dev, &status); |
| 770 | if (ret < 0) |
| 771 | return ret; |
| 772 | if (status != C2PORT_COMMAND_OK) |
| 773 | return -EBUSY; |
| 774 | |
| 775 | /* Send address high byte */ |
| 776 | c2port_write_dr(dev, offset >> 8); |
| 777 | ret = c2port_poll_in_busy(dev); |
| 778 | if (ret < 0) |
| 779 | return ret; |
| 780 | |
| 781 | /* Send address low byte */ |
| 782 | c2port_write_dr(dev, offset & 0x00ff); |
| 783 | ret = c2port_poll_in_busy(dev); |
| 784 | if (ret < 0) |
| 785 | return ret; |
| 786 | |
| 787 | /* Send address block size */ |
| 788 | c2port_write_dr(dev, nwrite); |
| 789 | ret = c2port_poll_in_busy(dev); |
| 790 | if (ret < 0) |
| 791 | return ret; |
| 792 | |
| 793 | /* Should check status before writing FLASH block */ |
| 794 | |
| 795 | /* Wait for status information */ |
| 796 | ret = c2port_poll_out_ready(dev); |
| 797 | if (ret < 0) |
| 798 | return ret; |
| 799 | |
| 800 | /* Read flash programming interface status */ |
| 801 | ret = c2port_read_dr(dev, &status); |
| 802 | if (ret < 0) |
| 803 | return ret; |
| 804 | if (status != C2PORT_COMMAND_OK) |
| 805 | return -EBUSY; |
| 806 | |
| 807 | /* Write flash block */ |
| 808 | for (i = 0; i < nwrite; i++) { |
| 809 | ret = c2port_write_dr(dev, *(buffer+i)); |
| 810 | if (ret < 0) |
| 811 | return ret; |
| 812 | |
| 813 | ret = c2port_poll_in_busy(dev); |
| 814 | if (ret < 0) |
| 815 | return ret; |
| 816 | |
| 817 | } |
| 818 | |
| 819 | /* Wait for last flash write to complete */ |
| 820 | ret = c2port_poll_out_ready(dev); |
| 821 | if (ret < 0) |
| 822 | return ret; |
| 823 | |
| 824 | return nwrite; |
| 825 | } |
| 826 | |
| 827 | static ssize_t c2port_write_flash_data(struct kobject *kobj, |
| 828 | struct bin_attribute *attr, |
| 829 | char *buffer, loff_t offset, size_t count) |
| 830 | { |
| 831 | struct c2port_device *c2dev = |
| 832 | dev_get_drvdata(container_of(kobj, |
| 833 | struct device, kobj)); |
| 834 | int ret; |
| 835 | |
| 836 | /* Check the device access status */ |
| 837 | if (!c2dev->access || !c2dev->flash_access) |
| 838 | return -EBUSY; |
| 839 | |
| 840 | mutex_lock(&c2dev->mutex); |
| 841 | ret = __c2port_write_flash_data(c2dev, buffer, offset, count); |
| 842 | mutex_unlock(&c2dev->mutex); |
| 843 | |
| 844 | if (ret < 0) |
| 845 | dev_err(c2dev->dev, "cannot write %s flash\n", c2dev->name); |
| 846 | |
| 847 | return ret; |
| 848 | } |
| 849 | |
| 850 | /* |
| 851 | * Class attributes |
| 852 | */ |
| 853 | |
| 854 | static struct device_attribute c2port_attrs[] = { |
| 855 | __ATTR(name, 0444, c2port_show_name, NULL), |
| 856 | __ATTR(flash_blocks_num, 0444, c2port_show_flash_blocks_num, NULL), |
| 857 | __ATTR(flash_block_size, 0444, c2port_show_flash_block_size, NULL), |
| 858 | __ATTR(flash_size, 0444, c2port_show_flash_size, NULL), |
| 859 | __ATTR(access, 0644, c2port_show_access, c2port_store_access), |
| 860 | __ATTR(reset, 0200, NULL, c2port_store_reset), |
| 861 | __ATTR(dev_id, 0444, c2port_show_dev_id, NULL), |
| 862 | __ATTR(rev_id, 0444, c2port_show_rev_id, NULL), |
| 863 | |
| 864 | __ATTR(flash_access, 0644, c2port_show_flash_access, |
| 865 | c2port_store_flash_access), |
| 866 | __ATTR(flash_erase, 0200, NULL, c2port_store_flash_erase), |
| 867 | __ATTR_NULL, |
| 868 | }; |
| 869 | |
| 870 | static struct bin_attribute c2port_bin_attrs = { |
| 871 | .attr = { |
| 872 | .name = "flash_data", |
| 873 | .mode = 0644 |
| 874 | }, |
| 875 | .read = c2port_read_flash_data, |
| 876 | .write = c2port_write_flash_data, |
| 877 | /* .size is computed at run-time */ |
| 878 | }; |
| 879 | |
| 880 | /* |
| 881 | * Exported functions |
| 882 | */ |
| 883 | |
| 884 | struct c2port_device *c2port_device_register(char *name, |
| 885 | struct c2port_ops *ops, void *devdata) |
| 886 | { |
| 887 | struct c2port_device *c2dev; |
| 888 | int id, ret; |
| 889 | |
| 890 | if (unlikely(!ops) || unlikely(!ops->access) || \ |
| 891 | unlikely(!ops->c2d_dir) || unlikely(!ops->c2ck_set) || \ |
| 892 | unlikely(!ops->c2d_get) || unlikely(!ops->c2d_set)) |
| 893 | return ERR_PTR(-EINVAL); |
| 894 | |
| 895 | c2dev = kmalloc(sizeof(struct c2port_device), GFP_KERNEL); |
Vegard Nossum | c53bd2e | 2009-02-26 14:05:59 +0100 | [diff] [blame] | 896 | kmemcheck_annotate_bitfield(c2dev, flags); |
Rodolfo Giometti | 4e17e1d | 2008-11-12 13:27:12 -0800 | [diff] [blame] | 897 | if (unlikely(!c2dev)) |
| 898 | return ERR_PTR(-ENOMEM); |
| 899 | |
| 900 | ret = idr_pre_get(&c2port_idr, GFP_KERNEL); |
| 901 | if (!ret) { |
| 902 | ret = -ENOMEM; |
| 903 | goto error_idr_get_new; |
| 904 | } |
| 905 | |
| 906 | spin_lock_irq(&c2port_idr_lock); |
| 907 | ret = idr_get_new(&c2port_idr, c2dev, &id); |
| 908 | spin_unlock_irq(&c2port_idr_lock); |
| 909 | |
| 910 | if (ret < 0) |
| 911 | goto error_idr_get_new; |
| 912 | c2dev->id = id; |
| 913 | |
| 914 | c2dev->dev = device_create(c2port_class, NULL, 0, c2dev, |
| 915 | "c2port%d", id); |
Jani Nikula | 8c363af | 2010-03-23 13:35:27 -0700 | [diff] [blame] | 916 | if (unlikely(IS_ERR(c2dev->dev))) { |
| 917 | ret = PTR_ERR(c2dev->dev); |
Rodolfo Giometti | 4e17e1d | 2008-11-12 13:27:12 -0800 | [diff] [blame] | 918 | goto error_device_create; |
| 919 | } |
| 920 | dev_set_drvdata(c2dev->dev, c2dev); |
| 921 | |
| 922 | strncpy(c2dev->name, name, C2PORT_NAME_LEN); |
| 923 | c2dev->ops = ops; |
| 924 | mutex_init(&c2dev->mutex); |
| 925 | |
| 926 | /* Create binary file */ |
| 927 | c2port_bin_attrs.size = ops->blocks_num * ops->block_size; |
| 928 | ret = device_create_bin_file(c2dev->dev, &c2port_bin_attrs); |
| 929 | if (unlikely(ret)) |
| 930 | goto error_device_create_bin_file; |
| 931 | |
| 932 | /* By default C2 port access is off */ |
| 933 | c2dev->access = c2dev->flash_access = 0; |
| 934 | ops->access(c2dev, 0); |
| 935 | |
| 936 | dev_info(c2dev->dev, "C2 port %s added\n", name); |
| 937 | dev_info(c2dev->dev, "%s flash has %d blocks x %d bytes " |
| 938 | "(%d bytes total)\n", |
| 939 | name, ops->blocks_num, ops->block_size, |
| 940 | ops->blocks_num * ops->block_size); |
| 941 | |
| 942 | return c2dev; |
| 943 | |
| 944 | error_device_create_bin_file: |
| 945 | device_destroy(c2port_class, 0); |
| 946 | |
| 947 | error_device_create: |
| 948 | spin_lock_irq(&c2port_idr_lock); |
| 949 | idr_remove(&c2port_idr, id); |
| 950 | spin_unlock_irq(&c2port_idr_lock); |
| 951 | |
| 952 | error_idr_get_new: |
| 953 | kfree(c2dev); |
| 954 | |
| 955 | return ERR_PTR(ret); |
| 956 | } |
| 957 | EXPORT_SYMBOL(c2port_device_register); |
| 958 | |
| 959 | void c2port_device_unregister(struct c2port_device *c2dev) |
| 960 | { |
| 961 | if (!c2dev) |
| 962 | return; |
| 963 | |
| 964 | dev_info(c2dev->dev, "C2 port %s removed\n", c2dev->name); |
| 965 | |
| 966 | device_remove_bin_file(c2dev->dev, &c2port_bin_attrs); |
| 967 | spin_lock_irq(&c2port_idr_lock); |
| 968 | idr_remove(&c2port_idr, c2dev->id); |
| 969 | spin_unlock_irq(&c2port_idr_lock); |
| 970 | |
| 971 | device_destroy(c2port_class, c2dev->id); |
| 972 | |
| 973 | kfree(c2dev); |
| 974 | } |
| 975 | EXPORT_SYMBOL(c2port_device_unregister); |
| 976 | |
| 977 | /* |
| 978 | * Module stuff |
| 979 | */ |
| 980 | |
| 981 | static int __init c2port_init(void) |
| 982 | { |
| 983 | printk(KERN_INFO "Silicon Labs C2 port support v. " DRIVER_VERSION |
| 984 | " - (C) 2007 Rodolfo Giometti\n"); |
| 985 | |
| 986 | c2port_class = class_create(THIS_MODULE, "c2port"); |
| 987 | if (!c2port_class) { |
| 988 | printk(KERN_ERR "c2port: failed to allocate class\n"); |
| 989 | return -ENOMEM; |
| 990 | } |
| 991 | c2port_class->dev_attrs = c2port_attrs; |
| 992 | |
| 993 | return 0; |
| 994 | } |
| 995 | |
| 996 | static void __exit c2port_exit(void) |
| 997 | { |
| 998 | class_destroy(c2port_class); |
| 999 | } |
| 1000 | |
| 1001 | module_init(c2port_init); |
| 1002 | module_exit(c2port_exit); |
| 1003 | |
| 1004 | MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); |
| 1005 | MODULE_DESCRIPTION("Silicon Labs C2 port support v. " DRIVER_VERSION); |
| 1006 | MODULE_LICENSE("GPL"); |