Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 1 | /* |
| 2 | * VMEbus User access driver |
| 3 | * |
Martyn Welch | 66bd8db | 2010-02-18 15:12:52 +0000 | [diff] [blame] | 4 | * Author: Martyn Welch <martyn.welch@ge.com> |
| 5 | * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc. |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 6 | * |
| 7 | * Based on work by: |
| 8 | * Tom Armistead and Ajit Prem |
| 9 | * Copyright 2004 Motorola Inc. |
| 10 | * |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify it |
| 13 | * under the terms of the GNU General Public License as published by the |
| 14 | * Free Software Foundation; either version 2 of the License, or (at your |
| 15 | * option) any later version. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/cdev.h> |
| 19 | #include <linux/delay.h> |
| 20 | #include <linux/device.h> |
| 21 | #include <linux/dma-mapping.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/ioctl.h> |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/mm.h> |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/pagemap.h> |
| 29 | #include <linux/pci.h> |
| 30 | #include <linux/semaphore.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame^] | 31 | #include <linux/slab.h> |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 32 | #include <linux/spinlock.h> |
| 33 | #include <linux/syscalls.h> |
| 34 | #include <linux/types.h> |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 35 | |
| 36 | #include <asm/io.h> |
| 37 | #include <asm/uaccess.h> |
| 38 | |
| 39 | #include "../vme.h" |
| 40 | #include "vme_user.h" |
| 41 | |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 42 | static char driver_name[] = "vme_user"; |
| 43 | |
| 44 | static int bus[USER_BUS_MAX]; |
| 45 | static int bus_num; |
| 46 | |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 47 | /* Currently Documentation/devices.txt defines the following for VME: |
| 48 | * |
| 49 | * 221 char VME bus |
| 50 | * 0 = /dev/bus/vme/m0 First master image |
| 51 | * 1 = /dev/bus/vme/m1 Second master image |
| 52 | * 2 = /dev/bus/vme/m2 Third master image |
| 53 | * 3 = /dev/bus/vme/m3 Fourth master image |
| 54 | * 4 = /dev/bus/vme/s0 First slave image |
| 55 | * 5 = /dev/bus/vme/s1 Second slave image |
| 56 | * 6 = /dev/bus/vme/s2 Third slave image |
| 57 | * 7 = /dev/bus/vme/s3 Fourth slave image |
| 58 | * 8 = /dev/bus/vme/ctl Control |
| 59 | * |
| 60 | * It is expected that all VME bus drivers will use the |
| 61 | * same interface. For interface documentation see |
| 62 | * http://www.vmelinux.org/. |
| 63 | * |
| 64 | * However the VME driver at http://www.vmelinux.org/ is rather old and doesn't |
| 65 | * even support the tsi148 chipset (which has 8 master and 8 slave windows). |
| 66 | * We'll run with this or now as far as possible, however it probably makes |
| 67 | * sense to get rid of the old mappings and just do everything dynamically. |
| 68 | * |
| 69 | * So for now, we'll restrict the driver to providing 4 masters and 4 slaves as |
| 70 | * defined above and try to support at least some of the interface from |
| 71 | * http://www.vmelinux.org/ as an alternative drive can be written providing a |
| 72 | * saner interface later. |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 73 | * |
| 74 | * The vmelinux.org driver never supported slave images, the devices reserved |
| 75 | * for slaves were repurposed to support all 8 master images on the UniverseII! |
| 76 | * We shall support 4 masters and 4 slaves with this driver. |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 77 | */ |
| 78 | #define VME_MAJOR 221 /* VME Major Device Number */ |
| 79 | #define VME_DEVS 9 /* Number of dev entries */ |
| 80 | |
| 81 | #define MASTER_MINOR 0 |
| 82 | #define MASTER_MAX 3 |
| 83 | #define SLAVE_MINOR 4 |
| 84 | #define SLAVE_MAX 7 |
| 85 | #define CONTROL_MINOR 8 |
| 86 | |
| 87 | #define PCI_BUF_SIZE 0x20000 /* Size of one slave image buffer */ |
| 88 | |
| 89 | /* |
| 90 | * Structure to handle image related parameters. |
| 91 | */ |
| 92 | typedef struct { |
| 93 | void __iomem *kern_buf; /* Buffer address in kernel space */ |
| 94 | dma_addr_t pci_buf; /* Buffer address in PCI address space */ |
| 95 | unsigned long long size_buf; /* Buffer size */ |
| 96 | struct semaphore sem; /* Semaphore for locking image */ |
| 97 | struct device *device; /* Sysfs device */ |
| 98 | struct vme_resource *resource; /* VME resource */ |
| 99 | int users; /* Number of current users */ |
| 100 | } image_desc_t; |
| 101 | static image_desc_t image[VME_DEVS]; |
| 102 | |
| 103 | typedef struct { |
| 104 | unsigned long reads; |
| 105 | unsigned long writes; |
| 106 | unsigned long ioctls; |
| 107 | unsigned long irqs; |
| 108 | unsigned long berrs; |
| 109 | unsigned long dmaErrors; |
| 110 | unsigned long timeouts; |
| 111 | unsigned long external; |
| 112 | } driver_stats_t; |
| 113 | static driver_stats_t statistics; |
| 114 | |
| 115 | struct cdev *vme_user_cdev; /* Character device */ |
| 116 | struct class *vme_user_sysfs_class; /* Sysfs class */ |
| 117 | struct device *vme_user_bridge; /* Pointer to the bridge device */ |
| 118 | |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 119 | |
| 120 | static const int type[VME_DEVS] = { MASTER_MINOR, MASTER_MINOR, |
| 121 | MASTER_MINOR, MASTER_MINOR, |
| 122 | SLAVE_MINOR, SLAVE_MINOR, |
| 123 | SLAVE_MINOR, SLAVE_MINOR, |
| 124 | CONTROL_MINOR |
| 125 | }; |
| 126 | |
| 127 | |
| 128 | static int vme_user_open(struct inode *, struct file *); |
| 129 | static int vme_user_release(struct inode *, struct file *); |
| 130 | static ssize_t vme_user_read(struct file *, char *, size_t, loff_t *); |
| 131 | static ssize_t vme_user_write(struct file *, const char *, size_t, loff_t *); |
| 132 | static loff_t vme_user_llseek(struct file *, loff_t, int); |
| 133 | static int vme_user_ioctl(struct inode *, struct file *, unsigned int, |
| 134 | unsigned long); |
| 135 | |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 136 | static int __init vme_user_probe(struct device *, int, int); |
| 137 | static int __exit vme_user_remove(struct device *, int, int); |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 138 | |
| 139 | static struct file_operations vme_user_fops = { |
| 140 | .open = vme_user_open, |
| 141 | .release = vme_user_release, |
| 142 | .read = vme_user_read, |
| 143 | .write = vme_user_write, |
| 144 | .llseek = vme_user_llseek, |
| 145 | .ioctl = vme_user_ioctl, |
| 146 | }; |
| 147 | |
| 148 | |
| 149 | /* |
| 150 | * Reset all the statistic counters |
| 151 | */ |
| 152 | static void reset_counters(void) |
| 153 | { |
| 154 | statistics.reads = 0; |
| 155 | statistics.writes = 0; |
| 156 | statistics.ioctls = 0; |
| 157 | statistics.irqs = 0; |
| 158 | statistics.berrs = 0; |
| 159 | statistics.dmaErrors = 0; |
| 160 | statistics.timeouts = 0; |
| 161 | } |
| 162 | |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 163 | static int vme_user_open(struct inode *inode, struct file *file) |
| 164 | { |
| 165 | int err; |
| 166 | unsigned int minor = MINOR(inode->i_rdev); |
| 167 | |
| 168 | down(&image[minor].sem); |
| 169 | /* Only allow device to be opened if a resource is allocated */ |
| 170 | if (image[minor].resource == NULL) { |
| 171 | printk(KERN_ERR "No resources allocated for device\n"); |
| 172 | err = -EINVAL; |
| 173 | goto err_res; |
| 174 | } |
| 175 | |
| 176 | /* Increment user count */ |
| 177 | image[minor].users++; |
| 178 | |
| 179 | up(&image[minor].sem); |
| 180 | |
| 181 | return 0; |
| 182 | |
| 183 | err_res: |
| 184 | up(&image[minor].sem); |
| 185 | |
| 186 | return err; |
| 187 | } |
| 188 | |
| 189 | static int vme_user_release(struct inode *inode, struct file *file) |
| 190 | { |
| 191 | unsigned int minor = MINOR(inode->i_rdev); |
| 192 | |
| 193 | down(&image[minor].sem); |
| 194 | |
| 195 | /* Decrement user count */ |
| 196 | image[minor].users--; |
| 197 | |
| 198 | up(&image[minor].sem); |
| 199 | |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * We are going ot alloc a page during init per window for small transfers. |
| 205 | * Small transfers will go VME -> buffer -> user space. Larger (more than a |
| 206 | * page) transfers will lock the user space buffer into memory and then |
| 207 | * transfer the data directly into the user space buffers. |
| 208 | */ |
| 209 | static ssize_t resource_to_user(int minor, char __user *buf, size_t count, |
| 210 | loff_t *ppos) |
| 211 | { |
| 212 | ssize_t retval; |
| 213 | ssize_t copied = 0; |
| 214 | |
| 215 | if (count <= image[minor].size_buf) { |
| 216 | /* We copy to kernel buffer */ |
| 217 | copied = vme_master_read(image[minor].resource, |
| 218 | image[minor].kern_buf, count, *ppos); |
| 219 | if (copied < 0) { |
| 220 | return (int)copied; |
| 221 | } |
| 222 | |
| 223 | retval = __copy_to_user(buf, image[minor].kern_buf, |
| 224 | (unsigned long)copied); |
| 225 | if (retval != 0) { |
| 226 | copied = (copied - retval); |
| 227 | printk("User copy failed\n"); |
| 228 | return -EINVAL; |
| 229 | } |
| 230 | |
| 231 | } else { |
| 232 | /* XXX Need to write this */ |
| 233 | printk("Currently don't support large transfers\n"); |
| 234 | /* Map in pages from userspace */ |
| 235 | |
| 236 | /* Call vme_master_read to do the transfer */ |
| 237 | return -EINVAL; |
| 238 | } |
| 239 | |
| 240 | return copied; |
| 241 | } |
| 242 | |
| 243 | /* |
| 244 | * We are going ot alloc a page during init per window for small transfers. |
| 245 | * Small transfers will go user space -> buffer -> VME. Larger (more than a |
| 246 | * page) transfers will lock the user space buffer into memory and then |
| 247 | * transfer the data directly from the user space buffers out to VME. |
| 248 | */ |
| 249 | static ssize_t resource_from_user(unsigned int minor, const char *buf, |
| 250 | size_t count, loff_t *ppos) |
| 251 | { |
| 252 | ssize_t retval; |
| 253 | ssize_t copied = 0; |
| 254 | |
| 255 | if (count <= image[minor].size_buf) { |
| 256 | retval = __copy_from_user(image[minor].kern_buf, buf, |
| 257 | (unsigned long)count); |
| 258 | if (retval != 0) |
| 259 | copied = (copied - retval); |
| 260 | else |
| 261 | copied = count; |
| 262 | |
| 263 | copied = vme_master_write(image[minor].resource, |
| 264 | image[minor].kern_buf, copied, *ppos); |
| 265 | } else { |
| 266 | /* XXX Need to write this */ |
| 267 | printk("Currently don't support large transfers\n"); |
| 268 | /* Map in pages from userspace */ |
| 269 | |
| 270 | /* Call vme_master_write to do the transfer */ |
| 271 | return -EINVAL; |
| 272 | } |
| 273 | |
| 274 | return copied; |
| 275 | } |
| 276 | |
| 277 | static ssize_t buffer_to_user(unsigned int minor, char __user *buf, |
| 278 | size_t count, loff_t *ppos) |
| 279 | { |
| 280 | void __iomem *image_ptr; |
| 281 | ssize_t retval; |
| 282 | |
| 283 | image_ptr = image[minor].kern_buf + *ppos; |
| 284 | |
| 285 | retval = __copy_to_user(buf, image_ptr, (unsigned long)count); |
| 286 | if (retval != 0) { |
| 287 | retval = (count - retval); |
| 288 | printk(KERN_WARNING "Partial copy to userspace\n"); |
| 289 | } else |
| 290 | retval = count; |
| 291 | |
| 292 | /* Return number of bytes successfully read */ |
| 293 | return retval; |
| 294 | } |
| 295 | |
| 296 | static ssize_t buffer_from_user(unsigned int minor, const char *buf, |
| 297 | size_t count, loff_t *ppos) |
| 298 | { |
| 299 | void __iomem *image_ptr; |
| 300 | size_t retval; |
| 301 | |
| 302 | image_ptr = image[minor].kern_buf + *ppos; |
| 303 | |
| 304 | retval = __copy_from_user(image_ptr, buf, (unsigned long)count); |
| 305 | if (retval != 0) { |
| 306 | retval = (count - retval); |
| 307 | printk(KERN_WARNING "Partial copy to userspace\n"); |
| 308 | } else |
| 309 | retval = count; |
| 310 | |
| 311 | /* Return number of bytes successfully read */ |
| 312 | return retval; |
| 313 | } |
| 314 | |
| 315 | static ssize_t vme_user_read(struct file *file, char *buf, size_t count, |
| 316 | loff_t * ppos) |
| 317 | { |
| 318 | unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev); |
| 319 | ssize_t retval; |
| 320 | size_t image_size; |
| 321 | size_t okcount; |
| 322 | |
| 323 | down(&image[minor].sem); |
| 324 | |
| 325 | /* XXX Do we *really* want this helper - we can use vme_*_get ? */ |
| 326 | image_size = vme_get_size(image[minor].resource); |
| 327 | |
| 328 | /* Ensure we are starting at a valid location */ |
| 329 | if ((*ppos < 0) || (*ppos > (image_size - 1))) { |
| 330 | up(&image[minor].sem); |
| 331 | return 0; |
| 332 | } |
| 333 | |
| 334 | /* Ensure not reading past end of the image */ |
| 335 | if (*ppos + count > image_size) |
| 336 | okcount = image_size - *ppos; |
| 337 | else |
| 338 | okcount = count; |
| 339 | |
| 340 | switch (type[minor]){ |
| 341 | case MASTER_MINOR: |
| 342 | retval = resource_to_user(minor, buf, okcount, ppos); |
| 343 | break; |
| 344 | case SLAVE_MINOR: |
| 345 | retval = buffer_to_user(minor, buf, okcount, ppos); |
| 346 | break; |
| 347 | default: |
| 348 | retval = -EINVAL; |
| 349 | } |
| 350 | |
| 351 | up(&image[minor].sem); |
| 352 | |
| 353 | if (retval > 0) |
| 354 | *ppos += retval; |
| 355 | |
| 356 | return retval; |
| 357 | } |
| 358 | |
| 359 | static ssize_t vme_user_write(struct file *file, const char *buf, size_t count, |
| 360 | loff_t *ppos) |
| 361 | { |
| 362 | unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev); |
| 363 | ssize_t retval; |
| 364 | size_t image_size; |
| 365 | size_t okcount; |
| 366 | |
| 367 | down(&image[minor].sem); |
| 368 | |
| 369 | image_size = vme_get_size(image[minor].resource); |
| 370 | |
| 371 | /* Ensure we are starting at a valid location */ |
| 372 | if ((*ppos < 0) || (*ppos > (image_size - 1))) { |
| 373 | up(&image[minor].sem); |
| 374 | return 0; |
| 375 | } |
| 376 | |
| 377 | /* Ensure not reading past end of the image */ |
| 378 | if (*ppos + count > image_size) |
| 379 | okcount = image_size - *ppos; |
| 380 | else |
| 381 | okcount = count; |
| 382 | |
| 383 | switch (type[minor]){ |
| 384 | case MASTER_MINOR: |
| 385 | retval = resource_from_user(minor, buf, okcount, ppos); |
| 386 | break; |
| 387 | case SLAVE_MINOR: |
| 388 | retval = buffer_from_user(minor, buf, okcount, ppos); |
| 389 | break; |
| 390 | default: |
| 391 | retval = -EINVAL; |
| 392 | } |
| 393 | |
| 394 | up(&image[minor].sem); |
| 395 | |
| 396 | if (retval > 0) |
| 397 | *ppos += retval; |
| 398 | |
| 399 | return retval; |
| 400 | } |
| 401 | |
| 402 | static loff_t vme_user_llseek(struct file *file, loff_t off, int whence) |
| 403 | { |
Arthur Benilov | 877de4b | 2010-02-16 15:40:30 +0100 | [diff] [blame] | 404 | loff_t absolute = -1; |
| 405 | unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev); |
| 406 | size_t image_size; |
| 407 | |
| 408 | down(&image[minor].sem); |
| 409 | image_size = vme_get_size(image[minor].resource); |
| 410 | |
| 411 | switch (whence) { |
| 412 | case SEEK_SET: |
| 413 | absolute = off; |
| 414 | break; |
| 415 | case SEEK_CUR: |
| 416 | absolute = file->f_pos + off; |
| 417 | break; |
| 418 | case SEEK_END: |
| 419 | absolute = image_size + off; |
| 420 | break; |
| 421 | default: |
| 422 | up(&image[minor].sem); |
| 423 | return -EINVAL; |
| 424 | break; |
| 425 | } |
| 426 | |
| 427 | if ((absolute < 0) || (absolute >= image_size)) { |
| 428 | up(&image[minor].sem); |
| 429 | return -EINVAL; |
| 430 | } |
| 431 | |
| 432 | file->f_pos = absolute; |
| 433 | |
| 434 | up(&image[minor].sem); |
| 435 | |
| 436 | return absolute; |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 437 | } |
| 438 | |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 439 | /* |
| 440 | * The ioctls provided by the old VME access method (the one at vmelinux.org) |
| 441 | * are most certainly wrong as the effectively push the registers layout |
| 442 | * through to user space. Given that the VME core can handle multiple bridges, |
| 443 | * with different register layouts this is most certainly not the way to go. |
| 444 | * |
| 445 | * We aren't using the structures defined in the Motorola driver either - these |
| 446 | * are also quite low level, however we should use the definitions that have |
| 447 | * already been defined. |
| 448 | */ |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 449 | static int vme_user_ioctl(struct inode *inode, struct file *file, |
| 450 | unsigned int cmd, unsigned long arg) |
| 451 | { |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 452 | struct vme_master master; |
| 453 | struct vme_slave slave; |
| 454 | unsigned long copied; |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 455 | unsigned int minor = MINOR(inode->i_rdev); |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 456 | int retval; |
| 457 | dma_addr_t pci_addr; |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 458 | |
| 459 | statistics.ioctls++; |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 460 | |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 461 | switch (type[minor]) { |
| 462 | case CONTROL_MINOR: |
| 463 | break; |
| 464 | case MASTER_MINOR: |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 465 | switch (cmd) { |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 466 | case VME_GET_MASTER: |
| 467 | memset(&master, 0, sizeof(struct vme_master)); |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 468 | |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 469 | /* XXX We do not want to push aspace, cycle and width |
| 470 | * to userspace as they are |
| 471 | */ |
| 472 | retval = vme_master_get(image[minor].resource, |
| 473 | &(master.enable), &(master.vme_addr), |
| 474 | &(master.size), &(master.aspace), |
| 475 | &(master.cycle), &(master.dwidth)); |
| 476 | |
| 477 | copied = copy_to_user((char *)arg, &master, |
| 478 | sizeof(struct vme_master)); |
| 479 | if (copied != 0) { |
| 480 | printk(KERN_WARNING "Partial copy to " |
| 481 | "userspace\n"); |
| 482 | return -EFAULT; |
| 483 | } |
| 484 | |
| 485 | return retval; |
| 486 | break; |
| 487 | |
| 488 | case VME_SET_MASTER: |
| 489 | |
| 490 | copied = copy_from_user(&master, (char *)arg, |
| 491 | sizeof(master)); |
| 492 | if (copied != 0) { |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 493 | printk(KERN_WARNING "Partial copy from " |
| 494 | "userspace\n"); |
| 495 | return -EFAULT; |
| 496 | } |
| 497 | |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 498 | /* XXX We do not want to push aspace, cycle and width |
| 499 | * to userspace as they are |
| 500 | */ |
| 501 | return vme_master_set(image[minor].resource, |
| 502 | master.enable, master.vme_addr, master.size, |
| 503 | master.aspace, master.cycle, master.dwidth); |
| 504 | |
| 505 | break; |
| 506 | } |
| 507 | break; |
| 508 | case SLAVE_MINOR: |
| 509 | switch (cmd) { |
| 510 | case VME_GET_SLAVE: |
| 511 | memset(&slave, 0, sizeof(struct vme_slave)); |
| 512 | |
| 513 | /* XXX We do not want to push aspace, cycle and width |
| 514 | * to userspace as they are |
| 515 | */ |
| 516 | retval = vme_slave_get(image[minor].resource, |
| 517 | &(slave.enable), &(slave.vme_addr), |
| 518 | &(slave.size), &pci_addr, &(slave.aspace), |
| 519 | &(slave.cycle)); |
| 520 | |
| 521 | copied = copy_to_user((char *)arg, &slave, |
| 522 | sizeof(struct vme_slave)); |
| 523 | if (copied != 0) { |
| 524 | printk(KERN_WARNING "Partial copy to " |
| 525 | "userspace\n"); |
| 526 | return -EFAULT; |
| 527 | } |
| 528 | |
| 529 | return retval; |
| 530 | break; |
| 531 | |
| 532 | case VME_SET_SLAVE: |
| 533 | |
| 534 | copied = copy_from_user(&slave, (char *)arg, |
| 535 | sizeof(slave)); |
| 536 | if (copied != 0) { |
| 537 | printk(KERN_WARNING "Partial copy from " |
| 538 | "userspace\n"); |
| 539 | return -EFAULT; |
| 540 | } |
| 541 | |
| 542 | /* XXX We do not want to push aspace, cycle and width |
| 543 | * to userspace as they are |
| 544 | */ |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 545 | return vme_slave_set(image[minor].resource, |
| 546 | slave.enable, slave.vme_addr, slave.size, |
| 547 | image[minor].pci_buf, slave.aspace, |
| 548 | slave.cycle); |
| 549 | |
| 550 | break; |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 551 | } |
| 552 | break; |
| 553 | } |
| 554 | |
| 555 | return -EINVAL; |
| 556 | } |
| 557 | |
| 558 | |
| 559 | /* |
| 560 | * Unallocate a previously allocated buffer |
| 561 | */ |
| 562 | static void buf_unalloc (int num) |
| 563 | { |
| 564 | if (image[num].kern_buf) { |
| 565 | #ifdef VME_DEBUG |
| 566 | printk(KERN_DEBUG "UniverseII:Releasing buffer at %p\n", |
| 567 | image[num].pci_buf); |
| 568 | #endif |
| 569 | |
| 570 | vme_free_consistent(image[num].resource, image[num].size_buf, |
| 571 | image[num].kern_buf, image[num].pci_buf); |
| 572 | |
| 573 | image[num].kern_buf = NULL; |
| 574 | image[num].pci_buf = 0; |
| 575 | image[num].size_buf = 0; |
| 576 | |
| 577 | #ifdef VME_DEBUG |
| 578 | } else { |
| 579 | printk(KERN_DEBUG "UniverseII: Buffer not allocated\n"); |
| 580 | #endif |
| 581 | } |
| 582 | } |
| 583 | |
| 584 | static struct vme_driver vme_user_driver = { |
| 585 | .name = driver_name, |
| 586 | .probe = vme_user_probe, |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 587 | .remove = vme_user_remove, |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 588 | }; |
| 589 | |
| 590 | |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 591 | static int __init vme_user_init(void) |
| 592 | { |
| 593 | int retval = 0; |
| 594 | int i; |
| 595 | struct vme_device_id *ids; |
| 596 | |
| 597 | printk(KERN_INFO "VME User Space Access Driver\n"); |
| 598 | |
| 599 | if (bus_num == 0) { |
| 600 | printk(KERN_ERR "%s: No cards, skipping registration\n", |
| 601 | driver_name); |
| 602 | goto err_nocard; |
| 603 | } |
| 604 | |
| 605 | /* Let's start by supporting one bus, we can support more than one |
| 606 | * in future revisions if that ever becomes necessary. |
| 607 | */ |
| 608 | if (bus_num > USER_BUS_MAX) { |
Martyn Welch | 51616e2 | 2009-12-15 08:42:43 +0000 | [diff] [blame] | 609 | printk(KERN_ERR "%s: Driver only able to handle %d buses\n", |
| 610 | driver_name, USER_BUS_MAX); |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 611 | bus_num = USER_BUS_MAX; |
| 612 | } |
| 613 | |
| 614 | |
| 615 | /* Dynamically create the bind table based on module parameters */ |
| 616 | ids = kmalloc(sizeof(struct vme_device_id) * (bus_num + 1), GFP_KERNEL); |
| 617 | if (ids == NULL) { |
| 618 | printk(KERN_ERR "%s: Unable to allocate ID table\n", |
| 619 | driver_name); |
| 620 | goto err_id; |
| 621 | } |
| 622 | |
| 623 | memset(ids, 0, (sizeof(struct vme_device_id) * (bus_num + 1))); |
| 624 | |
| 625 | for (i = 0; i < bus_num; i++) { |
| 626 | ids[i].bus = bus[i]; |
| 627 | /* |
| 628 | * We register the driver against the slot occupied by *this* |
| 629 | * card, since it's really a low level way of controlling |
| 630 | * the VME bridge |
| 631 | */ |
| 632 | ids[i].slot = VME_SLOT_CURRENT; |
| 633 | } |
| 634 | |
| 635 | vme_user_driver.bind_table = ids; |
| 636 | |
| 637 | retval = vme_register_driver(&vme_user_driver); |
| 638 | if (retval != 0) |
| 639 | goto err_reg; |
| 640 | |
| 641 | return retval; |
| 642 | |
| 643 | vme_unregister_driver(&vme_user_driver); |
| 644 | err_reg: |
| 645 | kfree(ids); |
| 646 | err_id: |
| 647 | err_nocard: |
| 648 | return retval; |
| 649 | } |
| 650 | |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 651 | /* |
| 652 | * In this simple access driver, the old behaviour is being preserved as much |
| 653 | * as practical. We will therefore reserve the buffers and request the images |
| 654 | * here so that we don't have to do it later. |
| 655 | */ |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 656 | static int __init vme_user_probe(struct device *dev, int cur_bus, int cur_slot) |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 657 | { |
| 658 | int i, err; |
Martyn Welch | beb9ccc | 2009-10-29 16:34:48 +0000 | [diff] [blame] | 659 | char name[12]; |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 660 | |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 661 | /* Save pointer to the bridge device */ |
| 662 | if (vme_user_bridge != NULL) { |
| 663 | printk(KERN_ERR "%s: Driver can only be loaded for 1 device\n", |
| 664 | driver_name); |
| 665 | err = -EINVAL; |
| 666 | goto err_dev; |
| 667 | } |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 668 | vme_user_bridge = dev; |
| 669 | |
| 670 | /* Initialise descriptors */ |
| 671 | for (i = 0; i < VME_DEVS; i++) { |
| 672 | image[i].kern_buf = NULL; |
| 673 | image[i].pci_buf = 0; |
| 674 | init_MUTEX(&(image[i].sem)); |
| 675 | image[i].device = NULL; |
| 676 | image[i].resource = NULL; |
| 677 | image[i].users = 0; |
| 678 | } |
| 679 | |
| 680 | /* Initialise statistics counters */ |
| 681 | reset_counters(); |
| 682 | |
| 683 | /* Assign major and minor numbers for the driver */ |
| 684 | err = register_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS, |
| 685 | driver_name); |
| 686 | if (err) { |
| 687 | printk(KERN_WARNING "%s: Error getting Major Number %d for " |
| 688 | "driver.\n", driver_name, VME_MAJOR); |
| 689 | goto err_region; |
| 690 | } |
| 691 | |
| 692 | /* Register the driver as a char device */ |
| 693 | vme_user_cdev = cdev_alloc(); |
| 694 | vme_user_cdev->ops = &vme_user_fops; |
| 695 | vme_user_cdev->owner = THIS_MODULE; |
| 696 | err = cdev_add(vme_user_cdev, MKDEV(VME_MAJOR, 0), VME_DEVS); |
| 697 | if (err) { |
| 698 | printk(KERN_WARNING "%s: cdev_all failed\n", driver_name); |
| 699 | goto err_char; |
| 700 | } |
| 701 | |
| 702 | /* Request slave resources and allocate buffers (128kB wide) */ |
| 703 | for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { |
| 704 | /* XXX Need to properly request attributes */ |
Arthur Benilov | 5188d74 | 2010-02-16 15:40:58 +0100 | [diff] [blame] | 705 | /* For ca91cx42 bridge there are only two slave windows |
| 706 | * supporting A16 addressing, so we request A24 supported |
| 707 | * by all windows. |
| 708 | */ |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 709 | image[i].resource = vme_slave_request(vme_user_bridge, |
Arthur Benilov | 5188d74 | 2010-02-16 15:40:58 +0100 | [diff] [blame] | 710 | VME_A24, VME_SCT); |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 711 | if (image[i].resource == NULL) { |
| 712 | printk(KERN_WARNING "Unable to allocate slave " |
| 713 | "resource\n"); |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 714 | goto err_slave; |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 715 | } |
| 716 | image[i].size_buf = PCI_BUF_SIZE; |
| 717 | image[i].kern_buf = vme_alloc_consistent(image[i].resource, |
| 718 | image[i].size_buf, &(image[i].pci_buf)); |
| 719 | if (image[i].kern_buf == NULL) { |
| 720 | printk(KERN_WARNING "Unable to allocate memory for " |
| 721 | "buffer\n"); |
| 722 | image[i].pci_buf = 0; |
| 723 | vme_slave_free(image[i].resource); |
| 724 | err = -ENOMEM; |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 725 | goto err_slave; |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 726 | } |
| 727 | } |
| 728 | |
| 729 | /* |
| 730 | * Request master resources allocate page sized buffers for small |
| 731 | * reads and writes |
| 732 | */ |
| 733 | for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) { |
| 734 | /* XXX Need to properly request attributes */ |
| 735 | image[i].resource = vme_master_request(vme_user_bridge, |
| 736 | VME_A32, VME_SCT, VME_D32); |
| 737 | if (image[i].resource == NULL) { |
| 738 | printk(KERN_WARNING "Unable to allocate master " |
| 739 | "resource\n"); |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 740 | goto err_master; |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 741 | } |
Arthur Benilov | 33e920d | 2010-02-16 15:41:21 +0100 | [diff] [blame] | 742 | image[i].size_buf = PCI_BUF_SIZE; |
| 743 | image[i].kern_buf = kmalloc(image[i].size_buf, GFP_KERNEL); |
| 744 | if (image[i].kern_buf == NULL) { |
| 745 | printk(KERN_WARNING "Unable to allocate memory for " |
| 746 | "master window buffers\n"); |
| 747 | err = -ENOMEM; |
| 748 | goto err_master_buf; |
| 749 | } |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 750 | } |
| 751 | |
| 752 | /* Create sysfs entries - on udev systems this creates the dev files */ |
| 753 | vme_user_sysfs_class = class_create(THIS_MODULE, driver_name); |
| 754 | if (IS_ERR(vme_user_sysfs_class)) { |
| 755 | printk(KERN_ERR "Error creating vme_user class.\n"); |
| 756 | err = PTR_ERR(vme_user_sysfs_class); |
| 757 | goto err_class; |
| 758 | } |
| 759 | |
| 760 | /* Add sysfs Entries */ |
| 761 | for (i=0; i<VME_DEVS; i++) { |
| 762 | switch (type[i]) { |
| 763 | case MASTER_MINOR: |
| 764 | sprintf(name,"bus/vme/m%%d"); |
| 765 | break; |
| 766 | case CONTROL_MINOR: |
| 767 | sprintf(name,"bus/vme/ctl"); |
| 768 | break; |
| 769 | case SLAVE_MINOR: |
| 770 | sprintf(name,"bus/vme/s%%d"); |
| 771 | break; |
| 772 | default: |
| 773 | err = -EINVAL; |
| 774 | goto err_sysfs; |
| 775 | break; |
| 776 | } |
| 777 | |
| 778 | image[i].device = |
| 779 | device_create(vme_user_sysfs_class, NULL, |
| 780 | MKDEV(VME_MAJOR, i), NULL, name, |
| 781 | (type[i] == SLAVE_MINOR)? i - (MASTER_MAX + 1) : i); |
| 782 | if (IS_ERR(image[i].device)) { |
| 783 | printk("%s: Error creating sysfs device\n", |
| 784 | driver_name); |
| 785 | err = PTR_ERR(image[i].device); |
| 786 | goto err_sysfs; |
| 787 | } |
| 788 | } |
| 789 | |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 790 | return 0; |
| 791 | |
| 792 | /* Ensure counter set correcty to destroy all sysfs devices */ |
| 793 | i = VME_DEVS; |
| 794 | err_sysfs: |
| 795 | while (i > 0){ |
| 796 | i--; |
| 797 | device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); |
| 798 | } |
| 799 | class_destroy(vme_user_sysfs_class); |
| 800 | |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 801 | /* Ensure counter set correcty to unalloc all master windows */ |
| 802 | i = MASTER_MAX + 1; |
Arthur Benilov | 33e920d | 2010-02-16 15:41:21 +0100 | [diff] [blame] | 803 | err_master_buf: |
| 804 | for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) |
| 805 | kfree(image[i].kern_buf); |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 806 | err_master: |
| 807 | while (i > MASTER_MINOR) { |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 808 | i--; |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 809 | vme_master_free(image[i].resource); |
| 810 | } |
| 811 | |
| 812 | /* |
| 813 | * Ensure counter set correcty to unalloc all slave windows and buffers |
| 814 | */ |
| 815 | i = SLAVE_MAX + 1; |
| 816 | err_slave: |
| 817 | while (i > SLAVE_MINOR) { |
| 818 | i--; |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 819 | vme_slave_free(image[i].resource); |
| 820 | buf_unalloc(i); |
| 821 | } |
| 822 | err_class: |
| 823 | cdev_del(vme_user_cdev); |
| 824 | err_char: |
| 825 | unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); |
| 826 | err_region: |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 827 | err_dev: |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 828 | return err; |
| 829 | } |
| 830 | |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 831 | static int __exit vme_user_remove(struct device *dev, int cur_bus, int cur_slot) |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 832 | { |
| 833 | int i; |
| 834 | |
| 835 | /* Remove sysfs Entries */ |
| 836 | for(i=0; i<VME_DEVS; i++) { |
| 837 | device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); |
| 838 | } |
| 839 | class_destroy(vme_user_sysfs_class); |
| 840 | |
Arthur Benilov | 33e920d | 2010-02-16 15:41:21 +0100 | [diff] [blame] | 841 | for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) |
| 842 | kfree(image[i].kern_buf); |
| 843 | |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 844 | for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 845 | vme_slave_set(image[i].resource, 0, 0, 0, 0, VME_A32, 0); |
| 846 | vme_slave_free(image[i].resource); |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 847 | buf_unalloc(i); |
| 848 | } |
| 849 | |
| 850 | /* Unregister device driver */ |
| 851 | cdev_del(vme_user_cdev); |
| 852 | |
| 853 | /* Unregiser the major and minor device numbers */ |
| 854 | unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 855 | |
| 856 | return 0; |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 857 | } |
| 858 | |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 859 | static void __exit vme_user_exit(void) |
| 860 | { |
| 861 | vme_unregister_driver(&vme_user_driver); |
| 862 | |
| 863 | kfree(vme_user_driver.bind_table); |
| 864 | } |
| 865 | |
| 866 | |
| 867 | MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the driver is connected"); |
| 868 | module_param_array(bus, int, &bus_num, 0); |
| 869 | |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 870 | MODULE_DESCRIPTION("VME User Space Access Driver"); |
Martyn Welch | 66bd8db | 2010-02-18 15:12:52 +0000 | [diff] [blame] | 871 | MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com"); |
Martyn Welch | f00a86d | 2009-07-31 09:28:17 +0100 | [diff] [blame] | 872 | MODULE_LICENSE("GPL"); |
| 873 | |
Martyn Welch | 238add5 | 2009-08-11 14:37:15 +0100 | [diff] [blame] | 874 | module_init(vme_user_init); |
| 875 | module_exit(vme_user_exit); |