Stephen Neuendorffer | ef141a0 | 2008-02-06 04:24:09 +1100 | [diff] [blame] | 1 | /***************************************************************************** |
| 2 | * |
| 3 | * Author: Xilinx, Inc. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License as published by the |
| 7 | * Free Software Foundation; either version 2 of the License, or (at your |
| 8 | * option) any later version. |
| 9 | * |
| 10 | * XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" |
| 11 | * AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND |
| 12 | * SOLUTIONS FOR XILINX DEVICES. BY PROVIDING THIS DESIGN, CODE, |
| 13 | * OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, |
| 14 | * APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION |
| 15 | * THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT, |
| 16 | * AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE |
| 17 | * FOR YOUR IMPLEMENTATION. XILINX EXPRESSLY DISCLAIMS ANY |
| 18 | * WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE |
| 19 | * IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR |
| 20 | * REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF |
| 21 | * INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 22 | * FOR A PARTICULAR PURPOSE. |
| 23 | * |
| 24 | * Xilinx products are not intended for use in life support appliances, |
| 25 | * devices, or systems. Use in such applications is expressly prohibited. |
| 26 | * |
| 27 | * (c) Copyright 2002 Xilinx Inc., Systems Engineering Group |
| 28 | * (c) Copyright 2004 Xilinx Inc., Systems Engineering Group |
| 29 | * (c) Copyright 2007-2008 Xilinx Inc. |
| 30 | * All rights reserved. |
| 31 | * |
| 32 | * You should have received a copy of the GNU General Public License along |
| 33 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 34 | * 675 Mass Ave, Cambridge, MA 02139, USA. |
| 35 | * |
| 36 | *****************************************************************************/ |
| 37 | |
| 38 | /* |
| 39 | * This is the code behind /dev/xilinx_icap -- it allows a user-space |
| 40 | * application to use the Xilinx ICAP subsystem. |
| 41 | * |
| 42 | * The following operations are possible: |
| 43 | * |
| 44 | * open open the port and initialize for access. |
| 45 | * release release port |
| 46 | * write Write a bitstream to the configuration processor. |
| 47 | * read Read a data stream from the configuration processor. |
| 48 | * |
| 49 | * After being opened, the port is initialized and accessed to avoid a |
| 50 | * corrupted first read which may occur with some hardware. The port |
| 51 | * is left in a desynched state, requiring that a synch sequence be |
| 52 | * transmitted before any valid configuration data. A user will have |
| 53 | * exclusive access to the device while it remains open, and the state |
| 54 | * of the ICAP cannot be guaranteed after the device is closed. Note |
| 55 | * that a complete reset of the core and the state of the ICAP cannot |
| 56 | * be performed on many versions of the cores, hence users of this |
| 57 | * device should avoid making inconsistent accesses to the device. In |
| 58 | * particular, accessing the read interface, without first generating |
| 59 | * a write containing a readback packet can leave the ICAP in an |
| 60 | * inaccessible state. |
| 61 | * |
| 62 | * Note that in order to use the read interface, it is first necessary |
| 63 | * to write a request packet to the write interface. i.e., it is not |
| 64 | * possible to simply readback the bitstream (or any configuration |
| 65 | * bits) from a device without specifically requesting them first. |
| 66 | * The code to craft such packets is intended to be part of the |
| 67 | * user-space application code that uses this device. The simplest |
| 68 | * way to use this interface is simply: |
| 69 | * |
| 70 | * cp foo.bit /dev/xilinx_icap |
| 71 | * |
| 72 | * Note that unless foo.bit is an appropriately constructed partial |
| 73 | * bitstream, this has a high likelyhood of overwriting the design |
| 74 | * currently programmed in the FPGA. |
| 75 | */ |
| 76 | |
| 77 | #include <linux/version.h> |
| 78 | #include <linux/module.h> |
| 79 | #include <linux/kernel.h> |
| 80 | #include <linux/types.h> |
| 81 | #include <linux/ioport.h> |
| 82 | #include <linux/interrupt.h> |
| 83 | #include <linux/fcntl.h> |
| 84 | #include <linux/init.h> |
| 85 | #include <linux/poll.h> |
| 86 | #include <linux/proc_fs.h> |
| 87 | #include <asm/semaphore.h> |
| 88 | #include <linux/sysctl.h> |
| 89 | #include <linux/version.h> |
| 90 | #include <linux/fs.h> |
| 91 | #include <linux/cdev.h> |
| 92 | #include <linux/platform_device.h> |
| 93 | |
| 94 | #include <asm/io.h> |
| 95 | #include <asm/uaccess.h> |
| 96 | #include <asm/system.h> |
| 97 | |
| 98 | #ifdef CONFIG_OF |
| 99 | /* For open firmware. */ |
| 100 | #include <linux/of_device.h> |
| 101 | #include <linux/of_platform.h> |
| 102 | #endif |
| 103 | |
| 104 | #include "xilinx_hwicap.h" |
| 105 | #include "buffer_icap.h" |
| 106 | #include "fifo_icap.h" |
| 107 | |
| 108 | #define DRIVER_NAME "xilinx_icap" |
| 109 | |
| 110 | #define HWICAP_REGS (0x10000) |
| 111 | |
| 112 | /* dynamically allocate device number */ |
| 113 | static int xhwicap_major; |
| 114 | static int xhwicap_minor; |
| 115 | #define HWICAP_DEVICES 1 |
| 116 | |
| 117 | module_param(xhwicap_major, int, S_IRUGO); |
| 118 | module_param(xhwicap_minor, int, S_IRUGO); |
| 119 | |
| 120 | /* An array, which is set to true when the device is registered. */ |
| 121 | static bool probed_devices[HWICAP_DEVICES]; |
| 122 | |
| 123 | static struct class *icap_class; |
| 124 | |
| 125 | #define UNIMPLEMENTED 0xFFFF |
| 126 | |
| 127 | static const struct config_registers v2_config_registers = { |
| 128 | .CRC = 0, |
| 129 | .FAR = 1, |
| 130 | .FDRI = 2, |
| 131 | .FDRO = 3, |
| 132 | .CMD = 4, |
| 133 | .CTL = 5, |
| 134 | .MASK = 6, |
| 135 | .STAT = 7, |
| 136 | .LOUT = 8, |
| 137 | .COR = 9, |
| 138 | .MFWR = 10, |
| 139 | .FLR = 11, |
| 140 | .KEY = 12, |
| 141 | .CBC = 13, |
| 142 | .IDCODE = 14, |
| 143 | .AXSS = UNIMPLEMENTED, |
| 144 | .C0R_1 = UNIMPLEMENTED, |
| 145 | .CSOB = UNIMPLEMENTED, |
| 146 | .WBSTAR = UNIMPLEMENTED, |
| 147 | .TIMER = UNIMPLEMENTED, |
| 148 | .BOOTSTS = UNIMPLEMENTED, |
| 149 | .CTL_1 = UNIMPLEMENTED, |
| 150 | }; |
| 151 | |
| 152 | static const struct config_registers v4_config_registers = { |
| 153 | .CRC = 0, |
| 154 | .FAR = 1, |
| 155 | .FDRI = 2, |
| 156 | .FDRO = 3, |
| 157 | .CMD = 4, |
| 158 | .CTL = 5, |
| 159 | .MASK = 6, |
| 160 | .STAT = 7, |
| 161 | .LOUT = 8, |
| 162 | .COR = 9, |
| 163 | .MFWR = 10, |
| 164 | .FLR = UNIMPLEMENTED, |
| 165 | .KEY = UNIMPLEMENTED, |
| 166 | .CBC = 11, |
| 167 | .IDCODE = 12, |
| 168 | .AXSS = 13, |
| 169 | .C0R_1 = UNIMPLEMENTED, |
| 170 | .CSOB = UNIMPLEMENTED, |
| 171 | .WBSTAR = UNIMPLEMENTED, |
| 172 | .TIMER = UNIMPLEMENTED, |
| 173 | .BOOTSTS = UNIMPLEMENTED, |
| 174 | .CTL_1 = UNIMPLEMENTED, |
| 175 | }; |
| 176 | static const struct config_registers v5_config_registers = { |
| 177 | .CRC = 0, |
| 178 | .FAR = 1, |
| 179 | .FDRI = 2, |
| 180 | .FDRO = 3, |
| 181 | .CMD = 4, |
| 182 | .CTL = 5, |
| 183 | .MASK = 6, |
| 184 | .STAT = 7, |
| 185 | .LOUT = 8, |
| 186 | .COR = 9, |
| 187 | .MFWR = 10, |
| 188 | .FLR = UNIMPLEMENTED, |
| 189 | .KEY = UNIMPLEMENTED, |
| 190 | .CBC = 11, |
| 191 | .IDCODE = 12, |
| 192 | .AXSS = 13, |
| 193 | .C0R_1 = 14, |
| 194 | .CSOB = 15, |
| 195 | .WBSTAR = 16, |
| 196 | .TIMER = 17, |
| 197 | .BOOTSTS = 18, |
| 198 | .CTL_1 = 19, |
| 199 | }; |
| 200 | |
| 201 | /** |
| 202 | * hwicap_command_desync: Send a DESYNC command to the ICAP port. |
| 203 | * @parameter drvdata: a pointer to the drvdata. |
| 204 | * |
| 205 | * This command desynchronizes the ICAP After this command, a |
| 206 | * bitstream containing a NULL packet, followed by a SYNCH packet is |
| 207 | * required before the ICAP will recognize commands. |
| 208 | */ |
| 209 | int hwicap_command_desync(struct hwicap_drvdata *drvdata) |
| 210 | { |
| 211 | u32 buffer[4]; |
| 212 | u32 index = 0; |
| 213 | |
| 214 | /* |
| 215 | * Create the data to be written to the ICAP. |
| 216 | */ |
| 217 | buffer[index++] = hwicap_type_1_write(drvdata->config_regs->CMD) | 1; |
| 218 | buffer[index++] = XHI_CMD_DESYNCH; |
| 219 | buffer[index++] = XHI_NOOP_PACKET; |
| 220 | buffer[index++] = XHI_NOOP_PACKET; |
| 221 | |
| 222 | /* |
| 223 | * Write the data to the FIFO and intiate the transfer of data present |
| 224 | * in the FIFO to the ICAP device. |
| 225 | */ |
| 226 | return drvdata->config->set_configuration(drvdata, |
| 227 | &buffer[0], index); |
| 228 | } |
| 229 | |
| 230 | /** |
| 231 | * hwicap_command_capture: Send a CAPTURE command to the ICAP port. |
| 232 | * @parameter drvdata: a pointer to the drvdata. |
| 233 | * |
| 234 | * This command captures all of the flip flop states so they will be |
| 235 | * available during readback. One can use this command instead of |
| 236 | * enabling the CAPTURE block in the design. |
| 237 | */ |
| 238 | int hwicap_command_capture(struct hwicap_drvdata *drvdata) |
| 239 | { |
| 240 | u32 buffer[7]; |
| 241 | u32 index = 0; |
| 242 | |
| 243 | /* |
| 244 | * Create the data to be written to the ICAP. |
| 245 | */ |
| 246 | buffer[index++] = XHI_DUMMY_PACKET; |
| 247 | buffer[index++] = XHI_SYNC_PACKET; |
| 248 | buffer[index++] = XHI_NOOP_PACKET; |
| 249 | buffer[index++] = hwicap_type_1_write(drvdata->config_regs->CMD) | 1; |
| 250 | buffer[index++] = XHI_CMD_GCAPTURE; |
| 251 | buffer[index++] = XHI_DUMMY_PACKET; |
| 252 | buffer[index++] = XHI_DUMMY_PACKET; |
| 253 | |
| 254 | /* |
| 255 | * Write the data to the FIFO and intiate the transfer of data |
| 256 | * present in the FIFO to the ICAP device. |
| 257 | */ |
| 258 | return drvdata->config->set_configuration(drvdata, |
| 259 | &buffer[0], index); |
| 260 | |
| 261 | } |
| 262 | |
| 263 | /** |
| 264 | * hwicap_get_configuration_register: Query a configuration register. |
| 265 | * @parameter drvdata: a pointer to the drvdata. |
| 266 | * @parameter reg: a constant which represents the configuration |
| 267 | * register value to be returned. |
| 268 | * Examples: XHI_IDCODE, XHI_FLR. |
| 269 | * @parameter RegData: returns the value of the register. |
| 270 | * |
| 271 | * Sends a query packet to the ICAP and then receives the response. |
| 272 | * The icap is left in Synched state. |
| 273 | */ |
| 274 | int hwicap_get_configuration_register(struct hwicap_drvdata *drvdata, |
| 275 | u32 reg, u32 *RegData) |
| 276 | { |
| 277 | int status; |
| 278 | u32 buffer[6]; |
| 279 | u32 index = 0; |
| 280 | |
| 281 | /* |
| 282 | * Create the data to be written to the ICAP. |
| 283 | */ |
| 284 | buffer[index++] = XHI_DUMMY_PACKET; |
| 285 | buffer[index++] = XHI_SYNC_PACKET; |
| 286 | buffer[index++] = XHI_NOOP_PACKET; |
| 287 | buffer[index++] = hwicap_type_1_read(reg) | 1; |
| 288 | buffer[index++] = XHI_NOOP_PACKET; |
| 289 | buffer[index++] = XHI_NOOP_PACKET; |
| 290 | |
| 291 | /* |
| 292 | * Write the data to the FIFO and intiate the transfer of data present |
| 293 | * in the FIFO to the ICAP device. |
| 294 | */ |
| 295 | status = drvdata->config->set_configuration(drvdata, |
| 296 | &buffer[0], index); |
| 297 | if (status) |
| 298 | return status; |
| 299 | |
| 300 | /* |
| 301 | * Read the configuration register |
| 302 | */ |
| 303 | status = drvdata->config->get_configuration(drvdata, RegData, 1); |
| 304 | if (status) |
| 305 | return status; |
| 306 | |
| 307 | return 0; |
| 308 | } |
| 309 | |
| 310 | int hwicap_initialize_hwicap(struct hwicap_drvdata *drvdata) |
| 311 | { |
| 312 | int status; |
| 313 | u32 idcode; |
| 314 | |
| 315 | dev_dbg(drvdata->dev, "initializing\n"); |
| 316 | |
| 317 | /* Abort any current transaction, to make sure we have the |
| 318 | * ICAP in a good state. */ |
| 319 | dev_dbg(drvdata->dev, "Reset...\n"); |
| 320 | drvdata->config->reset(drvdata); |
| 321 | |
| 322 | dev_dbg(drvdata->dev, "Desync...\n"); |
| 323 | status = hwicap_command_desync(drvdata); |
| 324 | if (status) |
| 325 | return status; |
| 326 | |
| 327 | /* Attempt to read the IDCODE from ICAP. This |
| 328 | * may not be returned correctly, due to the design of the |
| 329 | * hardware. |
| 330 | */ |
| 331 | dev_dbg(drvdata->dev, "Reading IDCODE...\n"); |
| 332 | status = hwicap_get_configuration_register( |
| 333 | drvdata, drvdata->config_regs->IDCODE, &idcode); |
| 334 | dev_dbg(drvdata->dev, "IDCODE = %x\n", idcode); |
| 335 | if (status) |
| 336 | return status; |
| 337 | |
| 338 | dev_dbg(drvdata->dev, "Desync...\n"); |
| 339 | status = hwicap_command_desync(drvdata); |
| 340 | if (status) |
| 341 | return status; |
| 342 | |
| 343 | return 0; |
| 344 | } |
| 345 | |
| 346 | static ssize_t |
| 347 | hwicap_read(struct file *file, char *buf, size_t count, loff_t *ppos) |
| 348 | { |
| 349 | struct hwicap_drvdata *drvdata = file->private_data; |
| 350 | ssize_t bytes_to_read = 0; |
| 351 | u32 *kbuf; |
| 352 | u32 words; |
| 353 | u32 bytes_remaining; |
| 354 | int status; |
| 355 | |
| 356 | if (down_interruptible(&drvdata->sem)) |
| 357 | return -ERESTARTSYS; |
| 358 | |
| 359 | if (drvdata->read_buffer_in_use) { |
| 360 | /* If there are leftover bytes in the buffer, just */ |
| 361 | /* return them and don't try to read more from the */ |
| 362 | /* ICAP device. */ |
| 363 | bytes_to_read = |
| 364 | (count < drvdata->read_buffer_in_use) ? count : |
| 365 | drvdata->read_buffer_in_use; |
| 366 | |
| 367 | /* Return the data currently in the read buffer. */ |
| 368 | if (copy_to_user(buf, drvdata->read_buffer, bytes_to_read)) { |
| 369 | status = -EFAULT; |
| 370 | goto error; |
| 371 | } |
| 372 | drvdata->read_buffer_in_use -= bytes_to_read; |
| 373 | memcpy(drvdata->read_buffer + bytes_to_read, |
| 374 | drvdata->read_buffer, 4 - bytes_to_read); |
| 375 | } else { |
| 376 | /* Get new data from the ICAP, and return was was requested. */ |
| 377 | kbuf = (u32 *) get_zeroed_page(GFP_KERNEL); |
| 378 | if (!kbuf) { |
| 379 | status = -ENOMEM; |
| 380 | goto error; |
| 381 | } |
| 382 | |
| 383 | /* The ICAP device is only able to read complete */ |
| 384 | /* words. If a number of bytes that do not correspond */ |
| 385 | /* to complete words is requested, then we read enough */ |
| 386 | /* words to get the required number of bytes, and then */ |
| 387 | /* save the remaining bytes for the next read. */ |
| 388 | |
| 389 | /* Determine the number of words to read, rounding up */ |
| 390 | /* if necessary. */ |
| 391 | words = ((count + 3) >> 2); |
| 392 | bytes_to_read = words << 2; |
| 393 | |
| 394 | if (bytes_to_read > PAGE_SIZE) |
| 395 | bytes_to_read = PAGE_SIZE; |
| 396 | |
| 397 | /* Ensure we only read a complete number of words. */ |
| 398 | bytes_remaining = bytes_to_read & 3; |
| 399 | bytes_to_read &= ~3; |
| 400 | words = bytes_to_read >> 2; |
| 401 | |
| 402 | status = drvdata->config->get_configuration(drvdata, |
| 403 | kbuf, words); |
| 404 | |
| 405 | /* If we didn't read correctly, then bail out. */ |
| 406 | if (status) { |
| 407 | free_page((unsigned long)kbuf); |
| 408 | goto error; |
| 409 | } |
| 410 | |
| 411 | /* If we fail to return the data to the user, then bail out. */ |
| 412 | if (copy_to_user(buf, kbuf, bytes_to_read)) { |
| 413 | free_page((unsigned long)kbuf); |
| 414 | status = -EFAULT; |
| 415 | goto error; |
| 416 | } |
| 417 | memcpy(kbuf, drvdata->read_buffer, bytes_remaining); |
| 418 | drvdata->read_buffer_in_use = bytes_remaining; |
| 419 | free_page((unsigned long)kbuf); |
| 420 | } |
| 421 | status = bytes_to_read; |
| 422 | error: |
| 423 | up(&drvdata->sem); |
| 424 | return status; |
| 425 | } |
| 426 | |
| 427 | static ssize_t |
| 428 | hwicap_write(struct file *file, const char *buf, |
| 429 | size_t count, loff_t *ppos) |
| 430 | { |
| 431 | struct hwicap_drvdata *drvdata = file->private_data; |
| 432 | ssize_t written = 0; |
| 433 | ssize_t left = count; |
| 434 | u32 *kbuf; |
| 435 | ssize_t len; |
| 436 | ssize_t status; |
| 437 | |
| 438 | if (down_interruptible(&drvdata->sem)) |
| 439 | return -ERESTARTSYS; |
| 440 | |
| 441 | left += drvdata->write_buffer_in_use; |
| 442 | |
| 443 | /* Only write multiples of 4 bytes. */ |
| 444 | if (left < 4) { |
| 445 | status = 0; |
| 446 | goto error; |
| 447 | } |
| 448 | |
| 449 | kbuf = (u32 *) __get_free_page(GFP_KERNEL); |
| 450 | if (!kbuf) { |
| 451 | status = -ENOMEM; |
| 452 | goto error; |
| 453 | } |
| 454 | |
| 455 | while (left > 3) { |
| 456 | /* only write multiples of 4 bytes, so there might */ |
| 457 | /* be as many as 3 bytes left (at the end). */ |
| 458 | len = left; |
| 459 | |
| 460 | if (len > PAGE_SIZE) |
| 461 | len = PAGE_SIZE; |
| 462 | len &= ~3; |
| 463 | |
| 464 | if (drvdata->write_buffer_in_use) { |
| 465 | memcpy(kbuf, drvdata->write_buffer, |
| 466 | drvdata->write_buffer_in_use); |
| 467 | if (copy_from_user( |
| 468 | (((char *)kbuf) + (drvdata->write_buffer_in_use)), |
| 469 | buf + written, |
| 470 | len - (drvdata->write_buffer_in_use))) { |
| 471 | free_page((unsigned long)kbuf); |
| 472 | status = -EFAULT; |
| 473 | goto error; |
| 474 | } |
| 475 | } else { |
| 476 | if (copy_from_user(kbuf, buf + written, len)) { |
| 477 | free_page((unsigned long)kbuf); |
| 478 | status = -EFAULT; |
| 479 | goto error; |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | status = drvdata->config->set_configuration(drvdata, |
| 484 | kbuf, len >> 2); |
| 485 | |
| 486 | if (status) { |
| 487 | free_page((unsigned long)kbuf); |
| 488 | status = -EFAULT; |
| 489 | goto error; |
| 490 | } |
| 491 | if (drvdata->write_buffer_in_use) { |
| 492 | len -= drvdata->write_buffer_in_use; |
| 493 | left -= drvdata->write_buffer_in_use; |
| 494 | drvdata->write_buffer_in_use = 0; |
| 495 | } |
| 496 | written += len; |
| 497 | left -= len; |
| 498 | } |
| 499 | if ((left > 0) && (left < 4)) { |
| 500 | if (!copy_from_user(drvdata->write_buffer, |
| 501 | buf + written, left)) { |
| 502 | drvdata->write_buffer_in_use = left; |
| 503 | written += left; |
| 504 | left = 0; |
| 505 | } |
| 506 | } |
| 507 | |
| 508 | free_page((unsigned long)kbuf); |
| 509 | status = written; |
| 510 | error: |
| 511 | up(&drvdata->sem); |
| 512 | return status; |
| 513 | } |
| 514 | |
| 515 | static int hwicap_open(struct inode *inode, struct file *file) |
| 516 | { |
| 517 | struct hwicap_drvdata *drvdata; |
| 518 | int status; |
| 519 | |
| 520 | drvdata = container_of(inode->i_cdev, struct hwicap_drvdata, cdev); |
| 521 | |
| 522 | if (down_interruptible(&drvdata->sem)) |
| 523 | return -ERESTARTSYS; |
| 524 | |
| 525 | if (drvdata->is_open) { |
| 526 | status = -EBUSY; |
| 527 | goto error; |
| 528 | } |
| 529 | |
| 530 | status = hwicap_initialize_hwicap(drvdata); |
| 531 | if (status) { |
| 532 | dev_err(drvdata->dev, "Failed to open file"); |
| 533 | goto error; |
| 534 | } |
| 535 | |
| 536 | file->private_data = drvdata; |
| 537 | drvdata->write_buffer_in_use = 0; |
| 538 | drvdata->read_buffer_in_use = 0; |
| 539 | drvdata->is_open = 1; |
| 540 | |
| 541 | error: |
| 542 | up(&drvdata->sem); |
| 543 | return status; |
| 544 | } |
| 545 | |
| 546 | static int hwicap_release(struct inode *inode, struct file *file) |
| 547 | { |
| 548 | struct hwicap_drvdata *drvdata = file->private_data; |
| 549 | int i; |
| 550 | int status = 0; |
| 551 | |
| 552 | if (down_interruptible(&drvdata->sem)) |
| 553 | return -ERESTARTSYS; |
| 554 | |
| 555 | if (drvdata->write_buffer_in_use) { |
| 556 | /* Flush write buffer. */ |
| 557 | for (i = drvdata->write_buffer_in_use; i < 4; i++) |
| 558 | drvdata->write_buffer[i] = 0; |
| 559 | |
| 560 | status = drvdata->config->set_configuration(drvdata, |
| 561 | (u32 *) drvdata->write_buffer, 1); |
| 562 | if (status) |
| 563 | goto error; |
| 564 | } |
| 565 | |
| 566 | status = hwicap_command_desync(drvdata); |
| 567 | if (status) |
| 568 | goto error; |
| 569 | |
| 570 | error: |
| 571 | drvdata->is_open = 0; |
| 572 | up(&drvdata->sem); |
| 573 | return status; |
| 574 | } |
| 575 | |
| 576 | static struct file_operations hwicap_fops = { |
| 577 | .owner = THIS_MODULE, |
| 578 | .write = hwicap_write, |
| 579 | .read = hwicap_read, |
| 580 | .open = hwicap_open, |
| 581 | .release = hwicap_release, |
| 582 | }; |
| 583 | |
| 584 | static int __devinit hwicap_setup(struct device *dev, int id, |
| 585 | const struct resource *regs_res, |
| 586 | const struct hwicap_driver_config *config, |
| 587 | const struct config_registers *config_regs) |
| 588 | { |
| 589 | dev_t devt; |
| 590 | struct hwicap_drvdata *drvdata = NULL; |
| 591 | int retval = 0; |
| 592 | |
| 593 | dev_info(dev, "Xilinx icap port driver\n"); |
| 594 | |
| 595 | if (id < 0) { |
| 596 | for (id = 0; id < HWICAP_DEVICES; id++) |
| 597 | if (!probed_devices[id]) |
| 598 | break; |
| 599 | } |
| 600 | if (id < 0 || id >= HWICAP_DEVICES) { |
| 601 | dev_err(dev, "%s%i too large\n", DRIVER_NAME, id); |
| 602 | return -EINVAL; |
| 603 | } |
| 604 | if (probed_devices[id]) { |
| 605 | dev_err(dev, "cannot assign to %s%i; it is already in use\n", |
| 606 | DRIVER_NAME, id); |
| 607 | return -EBUSY; |
| 608 | } |
| 609 | |
| 610 | probed_devices[id] = 1; |
| 611 | |
| 612 | devt = MKDEV(xhwicap_major, xhwicap_minor + id); |
| 613 | |
| 614 | drvdata = kmalloc(sizeof(struct hwicap_drvdata), GFP_KERNEL); |
| 615 | if (!drvdata) { |
| 616 | dev_err(dev, "Couldn't allocate device private record\n"); |
| 617 | return -ENOMEM; |
| 618 | } |
| 619 | memset((void *)drvdata, 0, sizeof(struct hwicap_drvdata)); |
| 620 | dev_set_drvdata(dev, (void *)drvdata); |
| 621 | |
| 622 | if (!regs_res) { |
| 623 | dev_err(dev, "Couldn't get registers resource\n"); |
| 624 | retval = -EFAULT; |
| 625 | goto failed1; |
| 626 | } |
| 627 | |
| 628 | drvdata->mem_start = regs_res->start; |
| 629 | drvdata->mem_end = regs_res->end; |
| 630 | drvdata->mem_size = regs_res->end - regs_res->start + 1; |
| 631 | |
| 632 | if (!request_mem_region(drvdata->mem_start, |
| 633 | drvdata->mem_size, DRIVER_NAME)) { |
| 634 | dev_err(dev, "Couldn't lock memory region at %p\n", |
| 635 | (void *)regs_res->start); |
| 636 | retval = -EBUSY; |
| 637 | goto failed1; |
| 638 | } |
| 639 | |
| 640 | drvdata->devt = devt; |
| 641 | drvdata->dev = dev; |
| 642 | drvdata->base_address = ioremap(drvdata->mem_start, drvdata->mem_size); |
| 643 | if (!drvdata->base_address) { |
| 644 | dev_err(dev, "ioremap() failed\n"); |
| 645 | goto failed2; |
| 646 | } |
| 647 | |
| 648 | drvdata->config = config; |
| 649 | drvdata->config_regs = config_regs; |
| 650 | |
| 651 | init_MUTEX(&drvdata->sem); |
| 652 | drvdata->is_open = 0; |
| 653 | |
| 654 | dev_info(dev, "ioremap %lx to %p with size %x\n", |
| 655 | (unsigned long int)drvdata->mem_start, |
| 656 | drvdata->base_address, drvdata->mem_size); |
| 657 | |
| 658 | cdev_init(&drvdata->cdev, &hwicap_fops); |
| 659 | drvdata->cdev.owner = THIS_MODULE; |
| 660 | retval = cdev_add(&drvdata->cdev, devt, 1); |
| 661 | if (retval) { |
| 662 | dev_err(dev, "cdev_add() failed\n"); |
| 663 | goto failed3; |
| 664 | } |
| 665 | /* devfs_mk_cdev(devt, S_IFCHR|S_IRUGO|S_IWUGO, DRIVER_NAME); */ |
| 666 | class_device_create(icap_class, NULL, devt, NULL, DRIVER_NAME); |
| 667 | return 0; /* success */ |
| 668 | |
| 669 | failed3: |
| 670 | iounmap(drvdata->base_address); |
| 671 | |
| 672 | failed2: |
| 673 | release_mem_region(regs_res->start, drvdata->mem_size); |
| 674 | |
| 675 | failed1: |
| 676 | kfree(drvdata); |
| 677 | |
| 678 | return retval; |
| 679 | } |
| 680 | |
| 681 | static struct hwicap_driver_config buffer_icap_config = { |
| 682 | .get_configuration = buffer_icap_get_configuration, |
| 683 | .set_configuration = buffer_icap_set_configuration, |
| 684 | .reset = buffer_icap_reset, |
| 685 | }; |
| 686 | |
| 687 | static struct hwicap_driver_config fifo_icap_config = { |
| 688 | .get_configuration = fifo_icap_get_configuration, |
| 689 | .set_configuration = fifo_icap_set_configuration, |
| 690 | .reset = fifo_icap_reset, |
| 691 | }; |
| 692 | |
| 693 | static int __devexit hwicap_remove(struct device *dev) |
| 694 | { |
| 695 | struct hwicap_drvdata *drvdata; |
| 696 | |
| 697 | drvdata = (struct hwicap_drvdata *)dev_get_drvdata(dev); |
| 698 | |
| 699 | if (!drvdata) |
| 700 | return 0; |
| 701 | |
| 702 | class_device_destroy(icap_class, drvdata->devt); |
| 703 | cdev_del(&drvdata->cdev); |
| 704 | iounmap(drvdata->base_address); |
| 705 | release_mem_region(drvdata->mem_start, drvdata->mem_size); |
| 706 | kfree(drvdata); |
| 707 | dev_set_drvdata(dev, NULL); |
| 708 | probed_devices[MINOR(dev->devt)-xhwicap_minor] = 0; |
| 709 | |
| 710 | return 0; /* success */ |
| 711 | } |
| 712 | |
| 713 | static int __devinit hwicap_drv_probe(struct platform_device *pdev) |
| 714 | { |
| 715 | struct resource *res; |
| 716 | const struct config_registers *regs; |
| 717 | const char *family; |
| 718 | |
| 719 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 720 | if (!res) |
| 721 | return -ENODEV; |
| 722 | |
| 723 | /* It's most likely that we're using V4, if the family is not |
| 724 | specified */ |
| 725 | regs = &v4_config_registers; |
| 726 | family = pdev->dev.platform_data; |
| 727 | |
| 728 | if (family) { |
| 729 | if (!strcmp(family, "virtex2p")) { |
| 730 | regs = &v2_config_registers; |
| 731 | } else if (!strcmp(family, "virtex4")) { |
| 732 | regs = &v4_config_registers; |
| 733 | } else if (!strcmp(family, "virtex5")) { |
| 734 | regs = &v5_config_registers; |
| 735 | } |
| 736 | } |
| 737 | |
| 738 | return hwicap_setup(&pdev->dev, pdev->id, res, |
| 739 | &buffer_icap_config, regs); |
| 740 | } |
| 741 | |
| 742 | static int __devexit hwicap_drv_remove(struct platform_device *pdev) |
| 743 | { |
| 744 | return hwicap_remove(&pdev->dev); |
| 745 | } |
| 746 | |
| 747 | static struct platform_driver hwicap_platform_driver = { |
| 748 | .probe = hwicap_drv_probe, |
| 749 | .remove = hwicap_drv_remove, |
| 750 | .driver = { |
| 751 | .owner = THIS_MODULE, |
| 752 | .name = DRIVER_NAME, |
| 753 | }, |
| 754 | }; |
| 755 | |
| 756 | /* --------------------------------------------------------------------- |
| 757 | * OF bus binding |
| 758 | */ |
| 759 | |
| 760 | #if defined(CONFIG_OF) |
| 761 | static int __devinit |
| 762 | hwicap_of_probe(struct of_device *op, const struct of_device_id *match) |
| 763 | { |
| 764 | struct resource res; |
| 765 | const unsigned int *id; |
| 766 | const char *family; |
| 767 | int rc; |
| 768 | const struct hwicap_driver_config *config = match->data; |
| 769 | const struct config_registers *regs; |
| 770 | |
| 771 | dev_dbg(&op->dev, "hwicap_of_probe(%p, %p)\n", op, match); |
| 772 | |
| 773 | rc = of_address_to_resource(op->node, 0, &res); |
| 774 | if (rc) { |
| 775 | dev_err(&op->dev, "invalid address\n"); |
| 776 | return rc; |
| 777 | } |
| 778 | |
| 779 | id = of_get_property(op->node, "port-number", NULL); |
| 780 | |
| 781 | /* It's most likely that we're using V4, if the family is not |
| 782 | specified */ |
| 783 | regs = &v4_config_registers; |
| 784 | family = of_get_property(op->node, "xlnx,family", NULL); |
| 785 | |
| 786 | if (family) { |
| 787 | if (!strcmp(family, "virtex2p")) { |
| 788 | regs = &v2_config_registers; |
| 789 | } else if (!strcmp(family, "virtex4")) { |
| 790 | regs = &v4_config_registers; |
| 791 | } else if (!strcmp(family, "virtex5")) { |
| 792 | regs = &v5_config_registers; |
| 793 | } |
| 794 | } |
| 795 | return hwicap_setup(&op->dev, id ? *id : -1, &res, config, |
| 796 | regs); |
| 797 | } |
| 798 | |
| 799 | static int __devexit hwicap_of_remove(struct of_device *op) |
| 800 | { |
| 801 | return hwicap_remove(&op->dev); |
| 802 | } |
| 803 | |
| 804 | /* Match table for of_platform binding */ |
| 805 | static const struct of_device_id __devinit hwicap_of_match[] = { |
| 806 | { .compatible = "xlnx,opb-hwicap-1.00.b", .data = &buffer_icap_config}, |
| 807 | { .compatible = "xlnx,xps-hwicap-1.00.a", .data = &fifo_icap_config}, |
| 808 | {}, |
| 809 | }; |
| 810 | MODULE_DEVICE_TABLE(of, hwicap_of_match); |
| 811 | |
| 812 | static struct of_platform_driver hwicap_of_driver = { |
| 813 | .owner = THIS_MODULE, |
| 814 | .name = DRIVER_NAME, |
| 815 | .match_table = hwicap_of_match, |
| 816 | .probe = hwicap_of_probe, |
| 817 | .remove = __devexit_p(hwicap_of_remove), |
| 818 | .driver = { |
| 819 | .name = DRIVER_NAME, |
| 820 | }, |
| 821 | }; |
| 822 | |
| 823 | /* Registration helpers to keep the number of #ifdefs to a minimum */ |
| 824 | static inline int __devinit hwicap_of_register(void) |
| 825 | { |
| 826 | pr_debug("hwicap: calling of_register_platform_driver()\n"); |
| 827 | return of_register_platform_driver(&hwicap_of_driver); |
| 828 | } |
| 829 | |
| 830 | static inline void __devexit hwicap_of_unregister(void) |
| 831 | { |
| 832 | of_unregister_platform_driver(&hwicap_of_driver); |
| 833 | } |
| 834 | #else /* CONFIG_OF */ |
| 835 | /* CONFIG_OF not enabled; do nothing helpers */ |
| 836 | static inline int __devinit hwicap_of_register(void) { return 0; } |
| 837 | static inline void __devexit hwicap_of_unregister(void) { } |
| 838 | #endif /* CONFIG_OF */ |
| 839 | |
| 840 | static int __devinit hwicap_module_init(void) |
| 841 | { |
| 842 | dev_t devt; |
| 843 | int retval; |
| 844 | |
| 845 | icap_class = class_create(THIS_MODULE, "xilinx_config"); |
| 846 | |
| 847 | if (xhwicap_major) { |
| 848 | devt = MKDEV(xhwicap_major, xhwicap_minor); |
| 849 | retval = register_chrdev_region( |
| 850 | devt, |
| 851 | HWICAP_DEVICES, |
| 852 | DRIVER_NAME); |
| 853 | if (retval < 0) |
| 854 | return retval; |
| 855 | } else { |
| 856 | retval = alloc_chrdev_region(&devt, |
| 857 | xhwicap_minor, |
| 858 | HWICAP_DEVICES, |
| 859 | DRIVER_NAME); |
| 860 | if (retval < 0) |
| 861 | return retval; |
| 862 | xhwicap_major = MAJOR(devt); |
| 863 | } |
| 864 | |
| 865 | retval = platform_driver_register(&hwicap_platform_driver); |
| 866 | |
| 867 | if (retval) |
| 868 | goto failed1; |
| 869 | |
| 870 | retval = hwicap_of_register(); |
| 871 | |
| 872 | if (retval) |
| 873 | goto failed2; |
| 874 | |
| 875 | return retval; |
| 876 | |
| 877 | failed2: |
| 878 | platform_driver_unregister(&hwicap_platform_driver); |
| 879 | |
| 880 | failed1: |
| 881 | unregister_chrdev_region(devt, HWICAP_DEVICES); |
| 882 | |
| 883 | return retval; |
| 884 | } |
| 885 | |
| 886 | static void __devexit hwicap_module_cleanup(void) |
| 887 | { |
| 888 | dev_t devt = MKDEV(xhwicap_major, xhwicap_minor); |
| 889 | |
| 890 | class_destroy(icap_class); |
| 891 | |
| 892 | platform_driver_unregister(&hwicap_platform_driver); |
| 893 | |
| 894 | hwicap_of_unregister(); |
| 895 | |
| 896 | unregister_chrdev_region(devt, HWICAP_DEVICES); |
| 897 | } |
| 898 | |
| 899 | module_init(hwicap_module_init); |
| 900 | module_exit(hwicap_module_cleanup); |
| 901 | |
| 902 | MODULE_AUTHOR("Xilinx, Inc; Xilinx Research Labs Group"); |
| 903 | MODULE_DESCRIPTION("Xilinx ICAP Port Driver"); |
| 904 | MODULE_LICENSE("GPL"); |