Commit | Line | Data |
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f00a86d9 MW |
1 | /* |
2 | * VMEbus User access driver | |
3 | * | |
66bd8db5 MW |
4 | * Author: Martyn Welch <martyn.welch@ge.com> |
5 | * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc. | |
f00a86d9 MW |
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 | ||
0093e5f8 YT |
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
19 | ||
c74a804f | 20 | #include <linux/atomic.h> |
f00a86d9 MW |
21 | #include <linux/cdev.h> |
22 | #include <linux/delay.h> | |
23 | #include <linux/device.h> | |
24 | #include <linux/dma-mapping.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/ioctl.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/pagemap.h> | |
32 | #include <linux/pci.h> | |
ecb3b80f | 33 | #include <linux/mutex.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
f00a86d9 MW |
35 | #include <linux/spinlock.h> |
36 | #include <linux/syscalls.h> | |
37 | #include <linux/types.h> | |
f00a86d9 | 38 | |
45f9f018 NC |
39 | #include <linux/io.h> |
40 | #include <linux/uaccess.h> | |
db3b9e99 | 41 | #include <linux/vme.h> |
f00a86d9 | 42 | |
f00a86d9 MW |
43 | #include "vme_user.h" |
44 | ||
584721ca | 45 | static const char driver_name[] = "vme_user"; |
238add52 | 46 | |
0a4b6b02 | 47 | static int bus[VME_USER_BUS_MAX]; |
c9492318 | 48 | static unsigned int bus_num; |
238add52 | 49 | |
f00a86d9 MW |
50 | /* Currently Documentation/devices.txt defines the following for VME: |
51 | * | |
52 | * 221 char VME bus | |
45f9f018 NC |
53 | * 0 = /dev/bus/vme/m0 First master image |
54 | * 1 = /dev/bus/vme/m1 Second master image | |
55 | * 2 = /dev/bus/vme/m2 Third master image | |
56 | * 3 = /dev/bus/vme/m3 Fourth master image | |
57 | * 4 = /dev/bus/vme/s0 First slave image | |
58 | * 5 = /dev/bus/vme/s1 Second slave image | |
59 | * 6 = /dev/bus/vme/s2 Third slave image | |
60 | * 7 = /dev/bus/vme/s3 Fourth slave image | |
61 | * 8 = /dev/bus/vme/ctl Control | |
f00a86d9 | 62 | * |
45f9f018 NC |
63 | * It is expected that all VME bus drivers will use the |
64 | * same interface. For interface documentation see | |
65 | * http://www.vmelinux.org/. | |
f00a86d9 MW |
66 | * |
67 | * However the VME driver at http://www.vmelinux.org/ is rather old and doesn't | |
68 | * even support the tsi148 chipset (which has 8 master and 8 slave windows). | |
95605332 | 69 | * We'll run with this for now as far as possible, however it probably makes |
f00a86d9 MW |
70 | * sense to get rid of the old mappings and just do everything dynamically. |
71 | * | |
72 | * So for now, we'll restrict the driver to providing 4 masters and 4 slaves as | |
73 | * defined above and try to support at least some of the interface from | |
95605332 JM |
74 | * http://www.vmelinux.org/ as an alternative the driver can be written |
75 | * providing a saner interface later. | |
238add52 MW |
76 | * |
77 | * The vmelinux.org driver never supported slave images, the devices reserved | |
78 | * for slaves were repurposed to support all 8 master images on the UniverseII! | |
79 | * We shall support 4 masters and 4 slaves with this driver. | |
f00a86d9 MW |
80 | */ |
81 | #define VME_MAJOR 221 /* VME Major Device Number */ | |
82 | #define VME_DEVS 9 /* Number of dev entries */ | |
83 | ||
84 | #define MASTER_MINOR 0 | |
85 | #define MASTER_MAX 3 | |
86 | #define SLAVE_MINOR 4 | |
87 | #define SLAVE_MAX 7 | |
88 | #define CONTROL_MINOR 8 | |
89 | ||
90 | #define PCI_BUF_SIZE 0x20000 /* Size of one slave image buffer */ | |
91 | ||
92 | /* | |
93 | * Structure to handle image related parameters. | |
94 | */ | |
584721ca | 95 | struct image_desc { |
0a81a0f7 | 96 | void *kern_buf; /* Buffer address in kernel space */ |
f00a86d9 MW |
97 | dma_addr_t pci_buf; /* Buffer address in PCI address space */ |
98 | unsigned long long size_buf; /* Buffer size */ | |
ecb3b80f | 99 | struct mutex mutex; /* Mutex for locking image */ |
f00a86d9 MW |
100 | struct device *device; /* Sysfs device */ |
101 | struct vme_resource *resource; /* VME resource */ | |
c74a804f | 102 | int mmap_count; /* Number of current mmap's */ |
584721ca | 103 | }; |
cd974d35 | 104 | |
584721ca | 105 | static struct image_desc image[VME_DEVS]; |
f00a86d9 | 106 | |
b9cc2934 EC |
107 | static struct cdev *vme_user_cdev; /* Character device */ |
108 | static struct class *vme_user_sysfs_class; /* Sysfs class */ | |
8f966dc4 | 109 | static struct vme_dev *vme_user_bridge; /* Pointer to user device */ |
f00a86d9 | 110 | |
f00a86d9 MW |
111 | static const int type[VME_DEVS] = { MASTER_MINOR, MASTER_MINOR, |
112 | MASTER_MINOR, MASTER_MINOR, | |
113 | SLAVE_MINOR, SLAVE_MINOR, | |
114 | SLAVE_MINOR, SLAVE_MINOR, | |
115 | CONTROL_MINOR | |
116 | }; | |
117 | ||
c74a804f DK |
118 | struct vme_user_vma_priv { |
119 | unsigned int minor; | |
120 | atomic_t refcnt; | |
121 | }; | |
122 | ||
f00a86d9 MW |
123 | /* |
124 | * We are going ot alloc a page during init per window for small transfers. | |
125 | * Small transfers will go VME -> buffer -> user space. Larger (more than a | |
126 | * page) transfers will lock the user space buffer into memory and then | |
127 | * transfer the data directly into the user space buffers. | |
128 | */ | |
129 | static ssize_t resource_to_user(int minor, char __user *buf, size_t count, | |
86eadace | 130 | loff_t *ppos) |
f00a86d9 MW |
131 | { |
132 | ssize_t retval; | |
133 | ssize_t copied = 0; | |
134 | ||
135 | if (count <= image[minor].size_buf) { | |
136 | /* We copy to kernel buffer */ | |
137 | copied = vme_master_read(image[minor].resource, | |
138 | image[minor].kern_buf, count, *ppos); | |
45f9f018 | 139 | if (copied < 0) |
f00a86d9 | 140 | return (int)copied; |
f00a86d9 MW |
141 | |
142 | retval = __copy_to_user(buf, image[minor].kern_buf, | |
143 | (unsigned long)copied); | |
144 | if (retval != 0) { | |
145 | copied = (copied - retval); | |
0093e5f8 | 146 | pr_info("User copy failed\n"); |
f00a86d9 MW |
147 | return -EINVAL; |
148 | } | |
149 | ||
150 | } else { | |
151 | /* XXX Need to write this */ | |
0093e5f8 | 152 | pr_info("Currently don't support large transfers\n"); |
f00a86d9 MW |
153 | /* Map in pages from userspace */ |
154 | ||
155 | /* Call vme_master_read to do the transfer */ | |
156 | return -EINVAL; | |
157 | } | |
158 | ||
159 | return copied; | |
160 | } | |
161 | ||
162 | /* | |
95605332 | 163 | * We are going to alloc a page during init per window for small transfers. |
f00a86d9 MW |
164 | * Small transfers will go user space -> buffer -> VME. Larger (more than a |
165 | * page) transfers will lock the user space buffer into memory and then | |
166 | * transfer the data directly from the user space buffers out to VME. | |
167 | */ | |
1a85f207 | 168 | static ssize_t resource_from_user(unsigned int minor, const char __user *buf, |
86eadace | 169 | size_t count, loff_t *ppos) |
f00a86d9 MW |
170 | { |
171 | ssize_t retval; | |
172 | ssize_t copied = 0; | |
173 | ||
174 | if (count <= image[minor].size_buf) { | |
175 | retval = __copy_from_user(image[minor].kern_buf, buf, | |
176 | (unsigned long)count); | |
177 | if (retval != 0) | |
178 | copied = (copied - retval); | |
179 | else | |
180 | copied = count; | |
181 | ||
182 | copied = vme_master_write(image[minor].resource, | |
183 | image[minor].kern_buf, copied, *ppos); | |
184 | } else { | |
185 | /* XXX Need to write this */ | |
0093e5f8 | 186 | pr_info("Currently don't support large transfers\n"); |
f00a86d9 MW |
187 | /* Map in pages from userspace */ |
188 | ||
189 | /* Call vme_master_write to do the transfer */ | |
190 | return -EINVAL; | |
191 | } | |
192 | ||
193 | return copied; | |
194 | } | |
195 | ||
196 | static ssize_t buffer_to_user(unsigned int minor, char __user *buf, | |
86eadace | 197 | size_t count, loff_t *ppos) |
f00a86d9 | 198 | { |
0a81a0f7 | 199 | void *image_ptr; |
f00a86d9 MW |
200 | ssize_t retval; |
201 | ||
202 | image_ptr = image[minor].kern_buf + *ppos; | |
203 | ||
204 | retval = __copy_to_user(buf, image_ptr, (unsigned long)count); | |
205 | if (retval != 0) { | |
206 | retval = (count - retval); | |
0093e5f8 | 207 | pr_warn("Partial copy to userspace\n"); |
f00a86d9 MW |
208 | } else |
209 | retval = count; | |
210 | ||
211 | /* Return number of bytes successfully read */ | |
212 | return retval; | |
213 | } | |
214 | ||
1a85f207 | 215 | static ssize_t buffer_from_user(unsigned int minor, const char __user *buf, |
86eadace | 216 | size_t count, loff_t *ppos) |
f00a86d9 | 217 | { |
0a81a0f7 | 218 | void *image_ptr; |
f00a86d9 MW |
219 | size_t retval; |
220 | ||
221 | image_ptr = image[minor].kern_buf + *ppos; | |
222 | ||
223 | retval = __copy_from_user(image_ptr, buf, (unsigned long)count); | |
224 | if (retval != 0) { | |
225 | retval = (count - retval); | |
0093e5f8 | 226 | pr_warn("Partial copy to userspace\n"); |
f00a86d9 MW |
227 | } else |
228 | retval = count; | |
229 | ||
230 | /* Return number of bytes successfully read */ | |
231 | return retval; | |
232 | } | |
233 | ||
1a85f207 | 234 | static ssize_t vme_user_read(struct file *file, char __user *buf, size_t count, |
86eadace | 235 | loff_t *ppos) |
f00a86d9 | 236 | { |
496ad9aa | 237 | unsigned int minor = MINOR(file_inode(file)->i_rdev); |
f00a86d9 MW |
238 | ssize_t retval; |
239 | size_t image_size; | |
240 | size_t okcount; | |
241 | ||
05614fbf VB |
242 | if (minor == CONTROL_MINOR) |
243 | return 0; | |
244 | ||
ecb3b80f | 245 | mutex_lock(&image[minor].mutex); |
f00a86d9 MW |
246 | |
247 | /* XXX Do we *really* want this helper - we can use vme_*_get ? */ | |
248 | image_size = vme_get_size(image[minor].resource); | |
249 | ||
250 | /* Ensure we are starting at a valid location */ | |
251 | if ((*ppos < 0) || (*ppos > (image_size - 1))) { | |
ecb3b80f | 252 | mutex_unlock(&image[minor].mutex); |
f00a86d9 MW |
253 | return 0; |
254 | } | |
255 | ||
256 | /* Ensure not reading past end of the image */ | |
257 | if (*ppos + count > image_size) | |
258 | okcount = image_size - *ppos; | |
259 | else | |
260 | okcount = count; | |
261 | ||
45f9f018 | 262 | switch (type[minor]) { |
f00a86d9 MW |
263 | case MASTER_MINOR: |
264 | retval = resource_to_user(minor, buf, okcount, ppos); | |
265 | break; | |
266 | case SLAVE_MINOR: | |
267 | retval = buffer_to_user(minor, buf, okcount, ppos); | |
268 | break; | |
269 | default: | |
270 | retval = -EINVAL; | |
271 | } | |
272 | ||
ecb3b80f | 273 | mutex_unlock(&image[minor].mutex); |
f00a86d9 MW |
274 | if (retval > 0) |
275 | *ppos += retval; | |
276 | ||
277 | return retval; | |
278 | } | |
279 | ||
1a85f207 | 280 | static ssize_t vme_user_write(struct file *file, const char __user *buf, |
86eadace | 281 | size_t count, loff_t *ppos) |
f00a86d9 | 282 | { |
496ad9aa | 283 | unsigned int minor = MINOR(file_inode(file)->i_rdev); |
f00a86d9 MW |
284 | ssize_t retval; |
285 | size_t image_size; | |
286 | size_t okcount; | |
287 | ||
05614fbf VB |
288 | if (minor == CONTROL_MINOR) |
289 | return 0; | |
290 | ||
ecb3b80f | 291 | mutex_lock(&image[minor].mutex); |
f00a86d9 MW |
292 | |
293 | image_size = vme_get_size(image[minor].resource); | |
294 | ||
295 | /* Ensure we are starting at a valid location */ | |
296 | if ((*ppos < 0) || (*ppos > (image_size - 1))) { | |
ecb3b80f | 297 | mutex_unlock(&image[minor].mutex); |
f00a86d9 MW |
298 | return 0; |
299 | } | |
300 | ||
301 | /* Ensure not reading past end of the image */ | |
302 | if (*ppos + count > image_size) | |
303 | okcount = image_size - *ppos; | |
304 | else | |
305 | okcount = count; | |
306 | ||
45f9f018 | 307 | switch (type[minor]) { |
f00a86d9 MW |
308 | case MASTER_MINOR: |
309 | retval = resource_from_user(minor, buf, okcount, ppos); | |
310 | break; | |
311 | case SLAVE_MINOR: | |
312 | retval = buffer_from_user(minor, buf, okcount, ppos); | |
313 | break; | |
314 | default: | |
315 | retval = -EINVAL; | |
316 | } | |
538a697a | 317 | |
ecb3b80f | 318 | mutex_unlock(&image[minor].mutex); |
f00a86d9 MW |
319 | |
320 | if (retval > 0) | |
321 | *ppos += retval; | |
322 | ||
323 | return retval; | |
324 | } | |
325 | ||
326 | static loff_t vme_user_llseek(struct file *file, loff_t off, int whence) | |
327 | { | |
496ad9aa | 328 | unsigned int minor = MINOR(file_inode(file)->i_rdev); |
877de4b4 | 329 | size_t image_size; |
59482291 | 330 | loff_t res; |
877de4b4 | 331 | |
615c40dd DK |
332 | switch (type[minor]) { |
333 | case MASTER_MINOR: | |
334 | case SLAVE_MINOR: | |
335 | mutex_lock(&image[minor].mutex); | |
336 | image_size = vme_get_size(image[minor].resource); | |
337 | res = fixed_size_llseek(file, off, whence, image_size); | |
338 | mutex_unlock(&image[minor].mutex); | |
339 | return res; | |
340 | } | |
877de4b4 | 341 | |
615c40dd | 342 | return -EINVAL; |
f00a86d9 MW |
343 | } |
344 | ||
238add52 MW |
345 | /* |
346 | * The ioctls provided by the old VME access method (the one at vmelinux.org) | |
347 | * are most certainly wrong as the effectively push the registers layout | |
348 | * through to user space. Given that the VME core can handle multiple bridges, | |
349 | * with different register layouts this is most certainly not the way to go. | |
350 | * | |
351 | * We aren't using the structures defined in the Motorola driver either - these | |
352 | * are also quite low level, however we should use the definitions that have | |
353 | * already been defined. | |
354 | */ | |
f00a86d9 | 355 | static int vme_user_ioctl(struct inode *inode, struct file *file, |
86eadace | 356 | unsigned int cmd, unsigned long arg) |
f00a86d9 | 357 | { |
238add52 MW |
358 | struct vme_master master; |
359 | struct vme_slave slave; | |
dca22184 | 360 | struct vme_irq_id irq_req; |
238add52 | 361 | unsigned long copied; |
f00a86d9 | 362 | unsigned int minor = MINOR(inode->i_rdev); |
238add52 MW |
363 | int retval; |
364 | dma_addr_t pci_addr; | |
1a85f207 | 365 | void __user *argp = (void __user *)arg; |
f00a86d9 | 366 | |
f00a86d9 MW |
367 | switch (type[minor]) { |
368 | case CONTROL_MINOR: | |
dca22184 VB |
369 | switch (cmd) { |
370 | case VME_IRQ_GEN: | |
a7f3943c | 371 | copied = copy_from_user(&irq_req, argp, |
dca22184 VB |
372 | sizeof(struct vme_irq_id)); |
373 | if (copied != 0) { | |
0093e5f8 | 374 | pr_warn("Partial copy from userspace\n"); |
dca22184 VB |
375 | return -EFAULT; |
376 | } | |
377 | ||
fc489a52 | 378 | return vme_irq_generate(vme_user_bridge, |
dca22184 VB |
379 | irq_req.level, |
380 | irq_req.statid); | |
dca22184 | 381 | } |
f00a86d9 MW |
382 | break; |
383 | case MASTER_MINOR: | |
f00a86d9 | 384 | switch (cmd) { |
238add52 MW |
385 | case VME_GET_MASTER: |
386 | memset(&master, 0, sizeof(struct vme_master)); | |
387 | ||
388 | /* XXX We do not want to push aspace, cycle and width | |
389 | * to userspace as they are | |
390 | */ | |
391 | retval = vme_master_get(image[minor].resource, | |
86eadace DK |
392 | &master.enable, |
393 | &master.vme_addr, | |
394 | &master.size, &master.aspace, | |
395 | &master.cycle, &master.dwidth); | |
238add52 | 396 | |
1a85f207 | 397 | copied = copy_to_user(argp, &master, |
86eadace | 398 | sizeof(struct vme_master)); |
238add52 | 399 | if (copied != 0) { |
0093e5f8 | 400 | pr_warn("Partial copy to userspace\n"); |
238add52 MW |
401 | return -EFAULT; |
402 | } | |
f00a86d9 | 403 | |
238add52 | 404 | return retval; |
238add52 MW |
405 | |
406 | case VME_SET_MASTER: | |
407 | ||
c74a804f DK |
408 | if (image[minor].mmap_count != 0) { |
409 | pr_warn("Can't adjust mapped window\n"); | |
410 | return -EPERM; | |
411 | } | |
412 | ||
1a85f207 | 413 | copied = copy_from_user(&master, argp, sizeof(master)); |
238add52 | 414 | if (copied != 0) { |
0093e5f8 | 415 | pr_warn("Partial copy from userspace\n"); |
f00a86d9 MW |
416 | return -EFAULT; |
417 | } | |
418 | ||
238add52 MW |
419 | /* XXX We do not want to push aspace, cycle and width |
420 | * to userspace as they are | |
421 | */ | |
422 | return vme_master_set(image[minor].resource, | |
423 | master.enable, master.vme_addr, master.size, | |
424 | master.aspace, master.cycle, master.dwidth); | |
f00a86d9 MW |
425 | |
426 | break; | |
238add52 MW |
427 | } |
428 | break; | |
429 | case SLAVE_MINOR: | |
430 | switch (cmd) { | |
f00a86d9 | 431 | case VME_GET_SLAVE: |
238add52 MW |
432 | memset(&slave, 0, sizeof(struct vme_slave)); |
433 | ||
434 | /* XXX We do not want to push aspace, cycle and width | |
435 | * to userspace as they are | |
436 | */ | |
437 | retval = vme_slave_get(image[minor].resource, | |
86eadace DK |
438 | &slave.enable, &slave.vme_addr, |
439 | &slave.size, &pci_addr, | |
440 | &slave.aspace, &slave.cycle); | |
238add52 | 441 | |
1a85f207 | 442 | copied = copy_to_user(argp, &slave, |
86eadace | 443 | sizeof(struct vme_slave)); |
238add52 | 444 | if (copied != 0) { |
0093e5f8 | 445 | pr_warn("Partial copy to userspace\n"); |
238add52 MW |
446 | return -EFAULT; |
447 | } | |
448 | ||
449 | return retval; | |
f00a86d9 | 450 | |
238add52 | 451 | case VME_SET_SLAVE: |
f00a86d9 | 452 | |
1a85f207 | 453 | copied = copy_from_user(&slave, argp, sizeof(slave)); |
238add52 | 454 | if (copied != 0) { |
0093e5f8 | 455 | pr_warn("Partial copy from userspace\n"); |
f00a86d9 MW |
456 | return -EFAULT; |
457 | } | |
458 | ||
238add52 MW |
459 | /* XXX We do not want to push aspace, cycle and width |
460 | * to userspace as they are | |
461 | */ | |
462 | return vme_slave_set(image[minor].resource, | |
463 | slave.enable, slave.vme_addr, slave.size, | |
464 | image[minor].pci_buf, slave.aspace, | |
465 | slave.cycle); | |
466 | ||
f00a86d9 | 467 | break; |
f00a86d9 MW |
468 | } |
469 | break; | |
470 | } | |
471 | ||
472 | return -EINVAL; | |
473 | } | |
474 | ||
b1f2ac07 AB |
475 | static long |
476 | vme_user_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
477 | { | |
478 | int ret; | |
0cd189a4 DK |
479 | struct inode *inode = file_inode(file); |
480 | unsigned int minor = MINOR(inode->i_rdev); | |
b1f2ac07 | 481 | |
0cd189a4 DK |
482 | mutex_lock(&image[minor].mutex); |
483 | ret = vme_user_ioctl(inode, file, cmd, arg); | |
484 | mutex_unlock(&image[minor].mutex); | |
b1f2ac07 AB |
485 | |
486 | return ret; | |
487 | } | |
488 | ||
c74a804f DK |
489 | static void vme_user_vm_open(struct vm_area_struct *vma) |
490 | { | |
491 | struct vme_user_vma_priv *vma_priv = vma->vm_private_data; | |
492 | ||
493 | atomic_inc(&vma_priv->refcnt); | |
494 | } | |
495 | ||
496 | static void vme_user_vm_close(struct vm_area_struct *vma) | |
497 | { | |
498 | struct vme_user_vma_priv *vma_priv = vma->vm_private_data; | |
499 | unsigned int minor = vma_priv->minor; | |
500 | ||
501 | if (!atomic_dec_and_test(&vma_priv->refcnt)) | |
502 | return; | |
503 | ||
504 | mutex_lock(&image[minor].mutex); | |
505 | image[minor].mmap_count--; | |
506 | mutex_unlock(&image[minor].mutex); | |
507 | ||
508 | kfree(vma_priv); | |
509 | } | |
510 | ||
e4aea6aa DK |
511 | static const struct vm_operations_struct vme_user_vm_ops = { |
512 | .open = vme_user_vm_open, | |
513 | .close = vme_user_vm_close, | |
514 | }; | |
515 | ||
c74a804f DK |
516 | static int vme_user_master_mmap(unsigned int minor, struct vm_area_struct *vma) |
517 | { | |
518 | int err; | |
519 | struct vme_user_vma_priv *vma_priv; | |
520 | ||
521 | mutex_lock(&image[minor].mutex); | |
522 | ||
523 | err = vme_master_mmap(image[minor].resource, vma); | |
524 | if (err) { | |
525 | mutex_unlock(&image[minor].mutex); | |
526 | return err; | |
527 | } | |
528 | ||
1f0622de | 529 | vma_priv = kmalloc(sizeof(*vma_priv), GFP_KERNEL); |
f99b71be | 530 | if (!vma_priv) { |
c74a804f DK |
531 | mutex_unlock(&image[minor].mutex); |
532 | return -ENOMEM; | |
533 | } | |
534 | ||
535 | vma_priv->minor = minor; | |
536 | atomic_set(&vma_priv->refcnt, 1); | |
537 | vma->vm_ops = &vme_user_vm_ops; | |
538 | vma->vm_private_data = vma_priv; | |
539 | ||
540 | image[minor].mmap_count++; | |
541 | ||
542 | mutex_unlock(&image[minor].mutex); | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
547 | static int vme_user_mmap(struct file *file, struct vm_area_struct *vma) | |
548 | { | |
549 | unsigned int minor = MINOR(file_inode(file)->i_rdev); | |
550 | ||
551 | if (type[minor] == MASTER_MINOR) | |
552 | return vme_user_master_mmap(minor, vma); | |
553 | ||
554 | return -ENODEV; | |
555 | } | |
556 | ||
e4aea6aa | 557 | static const struct file_operations vme_user_fops = { |
e4aea6aa DK |
558 | .read = vme_user_read, |
559 | .write = vme_user_write, | |
560 | .llseek = vme_user_llseek, | |
561 | .unlocked_ioctl = vme_user_unlocked_ioctl, | |
562 | .compat_ioctl = vme_user_unlocked_ioctl, | |
563 | .mmap = vme_user_mmap, | |
564 | }; | |
f00a86d9 | 565 | |
5d6abf37 MV |
566 | static int vme_user_match(struct vme_dev *vdev) |
567 | { | |
978f47d6 MW |
568 | int i; |
569 | ||
570 | int cur_bus = vme_bus_num(vdev); | |
d7729f0f | 571 | int cur_slot = vme_slot_num(vdev); |
978f47d6 MW |
572 | |
573 | for (i = 0; i < bus_num; i++) | |
574 | if ((cur_bus == bus[i]) && (cur_slot == vdev->num)) | |
575 | return 1; | |
576 | ||
577 | return 0; | |
5d6abf37 MV |
578 | } |
579 | ||
f00a86d9 | 580 | /* |
238add52 MW |
581 | * In this simple access driver, the old behaviour is being preserved as much |
582 | * as practical. We will therefore reserve the buffers and request the images | |
583 | * here so that we don't have to do it later. | |
f00a86d9 | 584 | */ |
d7e530d2 | 585 | static int vme_user_probe(struct vme_dev *vdev) |
f00a86d9 MW |
586 | { |
587 | int i, err; | |
f1552cbd | 588 | char *name; |
f00a86d9 | 589 | |
238add52 | 590 | /* Save pointer to the bridge device */ |
f99b71be | 591 | if (vme_user_bridge) { |
0093e5f8 | 592 | dev_err(&vdev->dev, "Driver can only be loaded for 1 device\n"); |
238add52 MW |
593 | err = -EINVAL; |
594 | goto err_dev; | |
595 | } | |
8f966dc4 | 596 | vme_user_bridge = vdev; |
f00a86d9 MW |
597 | |
598 | /* Initialise descriptors */ | |
599 | for (i = 0; i < VME_DEVS; i++) { | |
600 | image[i].kern_buf = NULL; | |
601 | image[i].pci_buf = 0; | |
ecb3b80f | 602 | mutex_init(&image[i].mutex); |
f00a86d9 MW |
603 | image[i].device = NULL; |
604 | image[i].resource = NULL; | |
f00a86d9 MW |
605 | } |
606 | ||
f00a86d9 MW |
607 | /* Assign major and minor numbers for the driver */ |
608 | err = register_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS, | |
86eadace | 609 | driver_name); |
f00a86d9 | 610 | if (err) { |
0093e5f8 YT |
611 | dev_warn(&vdev->dev, "Error getting Major Number %d for driver.\n", |
612 | VME_MAJOR); | |
f00a86d9 MW |
613 | goto err_region; |
614 | } | |
615 | ||
616 | /* Register the driver as a char device */ | |
617 | vme_user_cdev = cdev_alloc(); | |
d4113a69 KAM |
618 | if (!vme_user_cdev) { |
619 | err = -ENOMEM; | |
620 | goto err_char; | |
621 | } | |
f00a86d9 MW |
622 | vme_user_cdev->ops = &vme_user_fops; |
623 | vme_user_cdev->owner = THIS_MODULE; | |
624 | err = cdev_add(vme_user_cdev, MKDEV(VME_MAJOR, 0), VME_DEVS); | |
625 | if (err) { | |
0093e5f8 | 626 | dev_warn(&vdev->dev, "cdev_all failed\n"); |
f00a86d9 MW |
627 | goto err_char; |
628 | } | |
629 | ||
630 | /* Request slave resources and allocate buffers (128kB wide) */ | |
631 | for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { | |
632 | /* XXX Need to properly request attributes */ | |
5188d74c AB |
633 | /* For ca91cx42 bridge there are only two slave windows |
634 | * supporting A16 addressing, so we request A24 supported | |
635 | * by all windows. | |
636 | */ | |
f00a86d9 | 637 | image[i].resource = vme_slave_request(vme_user_bridge, |
5188d74c | 638 | VME_A24, VME_SCT); |
f99b71be | 639 | if (!image[i].resource) { |
0093e5f8 YT |
640 | dev_warn(&vdev->dev, |
641 | "Unable to allocate slave resource\n"); | |
465ff28d | 642 | err = -ENOMEM; |
238add52 | 643 | goto err_slave; |
f00a86d9 MW |
644 | } |
645 | image[i].size_buf = PCI_BUF_SIZE; | |
646 | image[i].kern_buf = vme_alloc_consistent(image[i].resource, | |
886953e9 | 647 | image[i].size_buf, &image[i].pci_buf); |
f99b71be | 648 | if (!image[i].kern_buf) { |
0093e5f8 YT |
649 | dev_warn(&vdev->dev, |
650 | "Unable to allocate memory for buffer\n"); | |
f00a86d9 MW |
651 | image[i].pci_buf = 0; |
652 | vme_slave_free(image[i].resource); | |
653 | err = -ENOMEM; | |
238add52 | 654 | goto err_slave; |
f00a86d9 MW |
655 | } |
656 | } | |
657 | ||
658 | /* | |
659 | * Request master resources allocate page sized buffers for small | |
660 | * reads and writes | |
661 | */ | |
662 | for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) { | |
663 | /* XXX Need to properly request attributes */ | |
664 | image[i].resource = vme_master_request(vme_user_bridge, | |
665 | VME_A32, VME_SCT, VME_D32); | |
f99b71be | 666 | if (!image[i].resource) { |
0093e5f8 YT |
667 | dev_warn(&vdev->dev, |
668 | "Unable to allocate master resource\n"); | |
465ff28d | 669 | err = -ENOMEM; |
238add52 | 670 | goto err_master; |
f00a86d9 | 671 | } |
33e920d9 AB |
672 | image[i].size_buf = PCI_BUF_SIZE; |
673 | image[i].kern_buf = kmalloc(image[i].size_buf, GFP_KERNEL); | |
f99b71be | 674 | if (!image[i].kern_buf) { |
33e920d9 | 675 | err = -ENOMEM; |
1a524893 DY |
676 | vme_master_free(image[i].resource); |
677 | goto err_master; | |
33e920d9 | 678 | } |
f00a86d9 MW |
679 | } |
680 | ||
681 | /* Create sysfs entries - on udev systems this creates the dev files */ | |
682 | vme_user_sysfs_class = class_create(THIS_MODULE, driver_name); | |
683 | if (IS_ERR(vme_user_sysfs_class)) { | |
0093e5f8 | 684 | dev_err(&vdev->dev, "Error creating vme_user class.\n"); |
f00a86d9 MW |
685 | err = PTR_ERR(vme_user_sysfs_class); |
686 | goto err_class; | |
687 | } | |
688 | ||
689 | /* Add sysfs Entries */ | |
45f9f018 | 690 | for (i = 0; i < VME_DEVS; i++) { |
584721ca | 691 | int num; |
938acb99 | 692 | |
f00a86d9 MW |
693 | switch (type[i]) { |
694 | case MASTER_MINOR: | |
f1552cbd | 695 | name = "bus/vme/m%d"; |
f00a86d9 MW |
696 | break; |
697 | case CONTROL_MINOR: | |
f1552cbd | 698 | name = "bus/vme/ctl"; |
f00a86d9 MW |
699 | break; |
700 | case SLAVE_MINOR: | |
f1552cbd | 701 | name = "bus/vme/s%d"; |
f00a86d9 MW |
702 | break; |
703 | default: | |
704 | err = -EINVAL; | |
705 | goto err_sysfs; | |
f00a86d9 MW |
706 | } |
707 | ||
584721ca VB |
708 | num = (type[i] == SLAVE_MINOR) ? i - (MASTER_MAX + 1) : i; |
709 | image[i].device = device_create(vme_user_sysfs_class, NULL, | |
710 | MKDEV(VME_MAJOR, i), NULL, name, num); | |
f00a86d9 | 711 | if (IS_ERR(image[i].device)) { |
0093e5f8 | 712 | dev_info(&vdev->dev, "Error creating sysfs device\n"); |
f00a86d9 MW |
713 | err = PTR_ERR(image[i].device); |
714 | goto err_sysfs; | |
715 | } | |
716 | } | |
717 | ||
f00a86d9 MW |
718 | return 0; |
719 | ||
f00a86d9 | 720 | err_sysfs: |
45f9f018 | 721 | while (i > 0) { |
f00a86d9 MW |
722 | i--; |
723 | device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); | |
724 | } | |
725 | class_destroy(vme_user_sysfs_class); | |
726 | ||
238add52 MW |
727 | /* Ensure counter set correcty to unalloc all master windows */ |
728 | i = MASTER_MAX + 1; | |
729 | err_master: | |
730 | while (i > MASTER_MINOR) { | |
731 | i--; | |
1a524893 | 732 | kfree(image[i].kern_buf); |
238add52 MW |
733 | vme_master_free(image[i].resource); |
734 | } | |
735 | ||
736 | /* | |
737 | * Ensure counter set correcty to unalloc all slave windows and buffers | |
738 | */ | |
f00a86d9 | 739 | i = SLAVE_MAX + 1; |
238add52 MW |
740 | err_slave: |
741 | while (i > SLAVE_MINOR) { | |
f00a86d9 | 742 | i--; |
625a9e01 DK |
743 | vme_free_consistent(image[i].resource, image[i].size_buf, |
744 | image[i].kern_buf, image[i].pci_buf); | |
1daa38d3 | 745 | vme_slave_free(image[i].resource); |
f00a86d9 MW |
746 | } |
747 | err_class: | |
748 | cdev_del(vme_user_cdev); | |
749 | err_char: | |
750 | unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); | |
751 | err_region: | |
238add52 | 752 | err_dev: |
f00a86d9 MW |
753 | return err; |
754 | } | |
755 | ||
f21a8247 | 756 | static int vme_user_remove(struct vme_dev *dev) |
f00a86d9 MW |
757 | { |
758 | int i; | |
759 | ||
760 | /* Remove sysfs Entries */ | |
ecb3b80f SN |
761 | for (i = 0; i < VME_DEVS; i++) { |
762 | mutex_destroy(&image[i].mutex); | |
f00a86d9 | 763 | device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); |
ecb3b80f | 764 | } |
f00a86d9 MW |
765 | class_destroy(vme_user_sysfs_class); |
766 | ||
b62c99b1 | 767 | for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) { |
33e920d9 | 768 | kfree(image[i].kern_buf); |
b62c99b1 EC |
769 | vme_master_free(image[i].resource); |
770 | } | |
33e920d9 | 771 | |
f00a86d9 | 772 | for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { |
238add52 | 773 | vme_slave_set(image[i].resource, 0, 0, 0, 0, VME_A32, 0); |
625a9e01 DK |
774 | vme_free_consistent(image[i].resource, image[i].size_buf, |
775 | image[i].kern_buf, image[i].pci_buf); | |
1daa38d3 | 776 | vme_slave_free(image[i].resource); |
f00a86d9 MW |
777 | } |
778 | ||
779 | /* Unregister device driver */ | |
780 | cdev_del(vme_user_cdev); | |
781 | ||
782 | /* Unregiser the major and minor device numbers */ | |
783 | unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); | |
238add52 MW |
784 | |
785 | return 0; | |
f00a86d9 MW |
786 | } |
787 | ||
e4aea6aa DK |
788 | static struct vme_driver vme_user_driver = { |
789 | .name = driver_name, | |
790 | .match = vme_user_match, | |
791 | .probe = vme_user_probe, | |
792 | .remove = vme_user_remove, | |
793 | }; | |
794 | ||
795 | static int __init vme_user_init(void) | |
796 | { | |
797 | int retval = 0; | |
798 | ||
799 | pr_info("VME User Space Access Driver\n"); | |
800 | ||
801 | if (bus_num == 0) { | |
802 | pr_err("No cards, skipping registration\n"); | |
803 | retval = -ENODEV; | |
804 | goto err_nocard; | |
805 | } | |
806 | ||
807 | /* Let's start by supporting one bus, we can support more than one | |
808 | * in future revisions if that ever becomes necessary. | |
809 | */ | |
810 | if (bus_num > VME_USER_BUS_MAX) { | |
811 | pr_err("Driver only able to handle %d buses\n", | |
812 | VME_USER_BUS_MAX); | |
813 | bus_num = VME_USER_BUS_MAX; | |
814 | } | |
815 | ||
816 | /* | |
817 | * Here we just register the maximum number of devices we can and | |
818 | * leave vme_user_match() to allow only 1 to go through to probe(). | |
819 | * This way, if we later want to allow multiple user access devices, | |
820 | * we just change the code in vme_user_match(). | |
821 | */ | |
822 | retval = vme_register_driver(&vme_user_driver, VME_MAX_SLOTS); | |
823 | if (retval != 0) | |
824 | goto err_reg; | |
825 | ||
826 | return retval; | |
827 | ||
828 | err_reg: | |
829 | err_nocard: | |
830 | return retval; | |
831 | } | |
832 | ||
238add52 MW |
833 | static void __exit vme_user_exit(void) |
834 | { | |
835 | vme_unregister_driver(&vme_user_driver); | |
238add52 MW |
836 | } |
837 | ||
238add52 MW |
838 | MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the driver is connected"); |
839 | module_param_array(bus, int, &bus_num, 0); | |
840 | ||
f00a86d9 | 841 | MODULE_DESCRIPTION("VME User Space Access Driver"); |
66bd8db5 | 842 | MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com"); |
f00a86d9 MW |
843 | MODULE_LICENSE("GPL"); |
844 | ||
238add52 MW |
845 | module_init(vme_user_init); |
846 | module_exit(vme_user_exit); |