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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 */ | |
102 | int users; /* Number of current users */ | |
c74a804f | 103 | int mmap_count; /* Number of current mmap's */ |
584721ca VB |
104 | }; |
105 | static struct image_desc image[VME_DEVS]; | |
f00a86d9 | 106 | |
584721ca | 107 | struct driver_stats { |
f00a86d9 MW |
108 | unsigned long reads; |
109 | unsigned long writes; | |
110 | unsigned long ioctls; | |
111 | unsigned long irqs; | |
112 | unsigned long berrs; | |
f827c165 | 113 | unsigned long dmaerrors; |
f00a86d9 MW |
114 | unsigned long timeouts; |
115 | unsigned long external; | |
584721ca VB |
116 | }; |
117 | static struct driver_stats statistics; | |
f00a86d9 | 118 | |
b9cc2934 EC |
119 | static struct cdev *vme_user_cdev; /* Character device */ |
120 | static struct class *vme_user_sysfs_class; /* Sysfs class */ | |
8f966dc4 | 121 | static struct vme_dev *vme_user_bridge; /* Pointer to user device */ |
f00a86d9 | 122 | |
f00a86d9 MW |
123 | |
124 | static const int type[VME_DEVS] = { MASTER_MINOR, MASTER_MINOR, | |
125 | MASTER_MINOR, MASTER_MINOR, | |
126 | SLAVE_MINOR, SLAVE_MINOR, | |
127 | SLAVE_MINOR, SLAVE_MINOR, | |
128 | CONTROL_MINOR | |
129 | }; | |
130 | ||
131 | ||
132 | static int vme_user_open(struct inode *, struct file *); | |
133 | static int vme_user_release(struct inode *, struct file *); | |
1a85f207 EC |
134 | static ssize_t vme_user_read(struct file *, char __user *, size_t, loff_t *); |
135 | static ssize_t vme_user_write(struct file *, const char __user *, size_t, | |
136 | loff_t *); | |
f00a86d9 | 137 | static loff_t vme_user_llseek(struct file *, loff_t, int); |
b1f2ac07 | 138 | static long vme_user_unlocked_ioctl(struct file *, unsigned int, unsigned long); |
c74a804f DK |
139 | static int vme_user_mmap(struct file *file, struct vm_area_struct *vma); |
140 | ||
141 | static void vme_user_vm_open(struct vm_area_struct *vma); | |
142 | static void vme_user_vm_close(struct vm_area_struct *vma); | |
f00a86d9 | 143 | |
5d6abf37 | 144 | static int vme_user_match(struct vme_dev *); |
d7e530d2 | 145 | static int vme_user_probe(struct vme_dev *); |
f21a8247 | 146 | static int vme_user_remove(struct vme_dev *); |
f00a86d9 | 147 | |
584721ca | 148 | static const struct file_operations vme_user_fops = { |
45f9f018 NC |
149 | .open = vme_user_open, |
150 | .release = vme_user_release, | |
151 | .read = vme_user_read, | |
152 | .write = vme_user_write, | |
153 | .llseek = vme_user_llseek, | |
154 | .unlocked_ioctl = vme_user_unlocked_ioctl, | |
89b1cc2d | 155 | .compat_ioctl = vme_user_unlocked_ioctl, |
c74a804f DK |
156 | .mmap = vme_user_mmap, |
157 | }; | |
158 | ||
159 | struct vme_user_vma_priv { | |
160 | unsigned int minor; | |
161 | atomic_t refcnt; | |
162 | }; | |
163 | ||
164 | static const struct vm_operations_struct vme_user_vm_ops = { | |
165 | .open = vme_user_vm_open, | |
166 | .close = vme_user_vm_close, | |
f00a86d9 MW |
167 | }; |
168 | ||
169 | ||
170 | /* | |
171 | * Reset all the statistic counters | |
172 | */ | |
173 | static void reset_counters(void) | |
174 | { | |
45f9f018 NC |
175 | statistics.reads = 0; |
176 | statistics.writes = 0; | |
177 | statistics.ioctls = 0; | |
178 | statistics.irqs = 0; | |
179 | statistics.berrs = 0; | |
f827c165 | 180 | statistics.dmaerrors = 0; |
45f9f018 | 181 | statistics.timeouts = 0; |
f00a86d9 MW |
182 | } |
183 | ||
f00a86d9 MW |
184 | static int vme_user_open(struct inode *inode, struct file *file) |
185 | { | |
186 | int err; | |
187 | unsigned int minor = MINOR(inode->i_rdev); | |
188 | ||
ecb3b80f | 189 | mutex_lock(&image[minor].mutex); |
05614fbf VB |
190 | /* Allow device to be opened if a resource is needed and allocated. */ |
191 | if (minor < CONTROL_MINOR && image[minor].resource == NULL) { | |
0093e5f8 | 192 | pr_err("No resources allocated for device\n"); |
f00a86d9 MW |
193 | err = -EINVAL; |
194 | goto err_res; | |
195 | } | |
196 | ||
197 | /* Increment user count */ | |
198 | image[minor].users++; | |
199 | ||
ecb3b80f | 200 | mutex_unlock(&image[minor].mutex); |
f00a86d9 MW |
201 | |
202 | return 0; | |
203 | ||
204 | err_res: | |
ecb3b80f | 205 | mutex_unlock(&image[minor].mutex); |
f00a86d9 MW |
206 | |
207 | return err; | |
208 | } | |
209 | ||
210 | static int vme_user_release(struct inode *inode, struct file *file) | |
211 | { | |
212 | unsigned int minor = MINOR(inode->i_rdev); | |
213 | ||
ecb3b80f | 214 | mutex_lock(&image[minor].mutex); |
f00a86d9 MW |
215 | |
216 | /* Decrement user count */ | |
217 | image[minor].users--; | |
218 | ||
ecb3b80f | 219 | mutex_unlock(&image[minor].mutex); |
f00a86d9 MW |
220 | |
221 | return 0; | |
222 | } | |
223 | ||
224 | /* | |
225 | * We are going ot alloc a page during init per window for small transfers. | |
226 | * Small transfers will go VME -> buffer -> user space. Larger (more than a | |
227 | * page) transfers will lock the user space buffer into memory and then | |
228 | * transfer the data directly into the user space buffers. | |
229 | */ | |
230 | static ssize_t resource_to_user(int minor, char __user *buf, size_t count, | |
231 | loff_t *ppos) | |
232 | { | |
233 | ssize_t retval; | |
234 | ssize_t copied = 0; | |
235 | ||
236 | if (count <= image[minor].size_buf) { | |
237 | /* We copy to kernel buffer */ | |
238 | copied = vme_master_read(image[minor].resource, | |
239 | image[minor].kern_buf, count, *ppos); | |
45f9f018 | 240 | if (copied < 0) |
f00a86d9 | 241 | return (int)copied; |
f00a86d9 MW |
242 | |
243 | retval = __copy_to_user(buf, image[minor].kern_buf, | |
244 | (unsigned long)copied); | |
245 | if (retval != 0) { | |
246 | copied = (copied - retval); | |
0093e5f8 | 247 | pr_info("User copy failed\n"); |
f00a86d9 MW |
248 | return -EINVAL; |
249 | } | |
250 | ||
251 | } else { | |
252 | /* XXX Need to write this */ | |
0093e5f8 | 253 | pr_info("Currently don't support large transfers\n"); |
f00a86d9 MW |
254 | /* Map in pages from userspace */ |
255 | ||
256 | /* Call vme_master_read to do the transfer */ | |
257 | return -EINVAL; | |
258 | } | |
259 | ||
260 | return copied; | |
261 | } | |
262 | ||
263 | /* | |
95605332 | 264 | * We are going to alloc a page during init per window for small transfers. |
f00a86d9 MW |
265 | * Small transfers will go user space -> buffer -> VME. Larger (more than a |
266 | * page) transfers will lock the user space buffer into memory and then | |
267 | * transfer the data directly from the user space buffers out to VME. | |
268 | */ | |
1a85f207 | 269 | static ssize_t resource_from_user(unsigned int minor, const char __user *buf, |
f00a86d9 MW |
270 | size_t count, loff_t *ppos) |
271 | { | |
272 | ssize_t retval; | |
273 | ssize_t copied = 0; | |
274 | ||
275 | if (count <= image[minor].size_buf) { | |
276 | retval = __copy_from_user(image[minor].kern_buf, buf, | |
277 | (unsigned long)count); | |
278 | if (retval != 0) | |
279 | copied = (copied - retval); | |
280 | else | |
281 | copied = count; | |
282 | ||
283 | copied = vme_master_write(image[minor].resource, | |
284 | image[minor].kern_buf, copied, *ppos); | |
285 | } else { | |
286 | /* XXX Need to write this */ | |
0093e5f8 | 287 | pr_info("Currently don't support large transfers\n"); |
f00a86d9 MW |
288 | /* Map in pages from userspace */ |
289 | ||
290 | /* Call vme_master_write to do the transfer */ | |
291 | return -EINVAL; | |
292 | } | |
293 | ||
294 | return copied; | |
295 | } | |
296 | ||
297 | static ssize_t buffer_to_user(unsigned int minor, char __user *buf, | |
298 | size_t count, loff_t *ppos) | |
299 | { | |
0a81a0f7 | 300 | void *image_ptr; |
f00a86d9 MW |
301 | ssize_t retval; |
302 | ||
303 | image_ptr = image[minor].kern_buf + *ppos; | |
304 | ||
305 | retval = __copy_to_user(buf, image_ptr, (unsigned long)count); | |
306 | if (retval != 0) { | |
307 | retval = (count - retval); | |
0093e5f8 | 308 | pr_warn("Partial copy to userspace\n"); |
f00a86d9 MW |
309 | } else |
310 | retval = count; | |
311 | ||
312 | /* Return number of bytes successfully read */ | |
313 | return retval; | |
314 | } | |
315 | ||
1a85f207 | 316 | static ssize_t buffer_from_user(unsigned int minor, const char __user *buf, |
f00a86d9 MW |
317 | size_t count, loff_t *ppos) |
318 | { | |
0a81a0f7 | 319 | void *image_ptr; |
f00a86d9 MW |
320 | size_t retval; |
321 | ||
322 | image_ptr = image[minor].kern_buf + *ppos; | |
323 | ||
324 | retval = __copy_from_user(image_ptr, buf, (unsigned long)count); | |
325 | if (retval != 0) { | |
326 | retval = (count - retval); | |
0093e5f8 | 327 | pr_warn("Partial copy to userspace\n"); |
f00a86d9 MW |
328 | } else |
329 | retval = count; | |
330 | ||
331 | /* Return number of bytes successfully read */ | |
332 | return retval; | |
333 | } | |
334 | ||
1a85f207 | 335 | static ssize_t vme_user_read(struct file *file, char __user *buf, size_t count, |
45f9f018 | 336 | loff_t *ppos) |
f00a86d9 | 337 | { |
496ad9aa | 338 | unsigned int minor = MINOR(file_inode(file)->i_rdev); |
f00a86d9 MW |
339 | ssize_t retval; |
340 | size_t image_size; | |
341 | size_t okcount; | |
342 | ||
05614fbf VB |
343 | if (minor == CONTROL_MINOR) |
344 | return 0; | |
345 | ||
ecb3b80f | 346 | mutex_lock(&image[minor].mutex); |
f00a86d9 MW |
347 | |
348 | /* XXX Do we *really* want this helper - we can use vme_*_get ? */ | |
349 | image_size = vme_get_size(image[minor].resource); | |
350 | ||
351 | /* Ensure we are starting at a valid location */ | |
352 | if ((*ppos < 0) || (*ppos > (image_size - 1))) { | |
ecb3b80f | 353 | mutex_unlock(&image[minor].mutex); |
f00a86d9 MW |
354 | return 0; |
355 | } | |
356 | ||
357 | /* Ensure not reading past end of the image */ | |
358 | if (*ppos + count > image_size) | |
359 | okcount = image_size - *ppos; | |
360 | else | |
361 | okcount = count; | |
362 | ||
45f9f018 | 363 | switch (type[minor]) { |
f00a86d9 MW |
364 | case MASTER_MINOR: |
365 | retval = resource_to_user(minor, buf, okcount, ppos); | |
366 | break; | |
367 | case SLAVE_MINOR: | |
368 | retval = buffer_to_user(minor, buf, okcount, ppos); | |
369 | break; | |
370 | default: | |
371 | retval = -EINVAL; | |
372 | } | |
373 | ||
ecb3b80f | 374 | mutex_unlock(&image[minor].mutex); |
f00a86d9 MW |
375 | if (retval > 0) |
376 | *ppos += retval; | |
377 | ||
378 | return retval; | |
379 | } | |
380 | ||
1a85f207 EC |
381 | static ssize_t vme_user_write(struct file *file, const char __user *buf, |
382 | size_t count, loff_t *ppos) | |
f00a86d9 | 383 | { |
496ad9aa | 384 | unsigned int minor = MINOR(file_inode(file)->i_rdev); |
f00a86d9 MW |
385 | ssize_t retval; |
386 | size_t image_size; | |
387 | size_t okcount; | |
388 | ||
05614fbf VB |
389 | if (minor == CONTROL_MINOR) |
390 | return 0; | |
391 | ||
ecb3b80f | 392 | mutex_lock(&image[minor].mutex); |
f00a86d9 MW |
393 | |
394 | image_size = vme_get_size(image[minor].resource); | |
395 | ||
396 | /* Ensure we are starting at a valid location */ | |
397 | if ((*ppos < 0) || (*ppos > (image_size - 1))) { | |
ecb3b80f | 398 | mutex_unlock(&image[minor].mutex); |
f00a86d9 MW |
399 | return 0; |
400 | } | |
401 | ||
402 | /* Ensure not reading past end of the image */ | |
403 | if (*ppos + count > image_size) | |
404 | okcount = image_size - *ppos; | |
405 | else | |
406 | okcount = count; | |
407 | ||
45f9f018 | 408 | switch (type[minor]) { |
f00a86d9 MW |
409 | case MASTER_MINOR: |
410 | retval = resource_from_user(minor, buf, okcount, ppos); | |
411 | break; | |
412 | case SLAVE_MINOR: | |
413 | retval = buffer_from_user(minor, buf, okcount, ppos); | |
414 | break; | |
415 | default: | |
416 | retval = -EINVAL; | |
417 | } | |
538a697a | 418 | |
ecb3b80f | 419 | mutex_unlock(&image[minor].mutex); |
f00a86d9 MW |
420 | |
421 | if (retval > 0) | |
422 | *ppos += retval; | |
423 | ||
424 | return retval; | |
425 | } | |
426 | ||
427 | static loff_t vme_user_llseek(struct file *file, loff_t off, int whence) | |
428 | { | |
496ad9aa | 429 | unsigned int minor = MINOR(file_inode(file)->i_rdev); |
877de4b4 | 430 | size_t image_size; |
59482291 | 431 | loff_t res; |
877de4b4 | 432 | |
05614fbf VB |
433 | if (minor == CONTROL_MINOR) |
434 | return -EINVAL; | |
435 | ||
ecb3b80f | 436 | mutex_lock(&image[minor].mutex); |
877de4b4 | 437 | image_size = vme_get_size(image[minor].resource); |
59482291 | 438 | res = fixed_size_llseek(file, off, whence, image_size); |
ecb3b80f | 439 | mutex_unlock(&image[minor].mutex); |
877de4b4 | 440 | |
59482291 | 441 | return res; |
f00a86d9 MW |
442 | } |
443 | ||
238add52 MW |
444 | /* |
445 | * The ioctls provided by the old VME access method (the one at vmelinux.org) | |
446 | * are most certainly wrong as the effectively push the registers layout | |
447 | * through to user space. Given that the VME core can handle multiple bridges, | |
448 | * with different register layouts this is most certainly not the way to go. | |
449 | * | |
450 | * We aren't using the structures defined in the Motorola driver either - these | |
451 | * are also quite low level, however we should use the definitions that have | |
452 | * already been defined. | |
453 | */ | |
f00a86d9 MW |
454 | static int vme_user_ioctl(struct inode *inode, struct file *file, |
455 | unsigned int cmd, unsigned long arg) | |
456 | { | |
238add52 MW |
457 | struct vme_master master; |
458 | struct vme_slave slave; | |
dca22184 | 459 | struct vme_irq_id irq_req; |
238add52 | 460 | unsigned long copied; |
f00a86d9 | 461 | unsigned int minor = MINOR(inode->i_rdev); |
238add52 MW |
462 | int retval; |
463 | dma_addr_t pci_addr; | |
1a85f207 | 464 | void __user *argp = (void __user *)arg; |
f00a86d9 MW |
465 | |
466 | statistics.ioctls++; | |
238add52 | 467 | |
f00a86d9 MW |
468 | switch (type[minor]) { |
469 | case CONTROL_MINOR: | |
dca22184 VB |
470 | switch (cmd) { |
471 | case VME_IRQ_GEN: | |
a7f3943c | 472 | copied = copy_from_user(&irq_req, argp, |
dca22184 VB |
473 | sizeof(struct vme_irq_id)); |
474 | if (copied != 0) { | |
0093e5f8 | 475 | pr_warn("Partial copy from userspace\n"); |
dca22184 VB |
476 | return -EFAULT; |
477 | } | |
478 | ||
fc489a52 | 479 | return vme_irq_generate(vme_user_bridge, |
dca22184 VB |
480 | irq_req.level, |
481 | irq_req.statid); | |
dca22184 | 482 | } |
f00a86d9 MW |
483 | break; |
484 | case MASTER_MINOR: | |
f00a86d9 | 485 | switch (cmd) { |
238add52 MW |
486 | case VME_GET_MASTER: |
487 | memset(&master, 0, sizeof(struct vme_master)); | |
488 | ||
489 | /* XXX We do not want to push aspace, cycle and width | |
490 | * to userspace as they are | |
491 | */ | |
492 | retval = vme_master_get(image[minor].resource, | |
886953e9 EC |
493 | &master.enable, &master.vme_addr, |
494 | &master.size, &master.aspace, | |
495 | &master.cycle, &master.dwidth); | |
238add52 | 496 | |
1a85f207 | 497 | copied = copy_to_user(argp, &master, |
238add52 MW |
498 | sizeof(struct vme_master)); |
499 | if (copied != 0) { | |
0093e5f8 | 500 | pr_warn("Partial copy to userspace\n"); |
238add52 MW |
501 | return -EFAULT; |
502 | } | |
f00a86d9 | 503 | |
238add52 | 504 | return retval; |
238add52 MW |
505 | |
506 | case VME_SET_MASTER: | |
507 | ||
c74a804f DK |
508 | if (image[minor].mmap_count != 0) { |
509 | pr_warn("Can't adjust mapped window\n"); | |
510 | return -EPERM; | |
511 | } | |
512 | ||
1a85f207 | 513 | copied = copy_from_user(&master, argp, sizeof(master)); |
238add52 | 514 | if (copied != 0) { |
0093e5f8 | 515 | pr_warn("Partial copy from userspace\n"); |
f00a86d9 MW |
516 | return -EFAULT; |
517 | } | |
518 | ||
238add52 MW |
519 | /* XXX We do not want to push aspace, cycle and width |
520 | * to userspace as they are | |
521 | */ | |
522 | return vme_master_set(image[minor].resource, | |
523 | master.enable, master.vme_addr, master.size, | |
524 | master.aspace, master.cycle, master.dwidth); | |
f00a86d9 MW |
525 | |
526 | break; | |
238add52 MW |
527 | } |
528 | break; | |
529 | case SLAVE_MINOR: | |
530 | switch (cmd) { | |
f00a86d9 | 531 | case VME_GET_SLAVE: |
238add52 MW |
532 | memset(&slave, 0, sizeof(struct vme_slave)); |
533 | ||
534 | /* XXX We do not want to push aspace, cycle and width | |
535 | * to userspace as they are | |
536 | */ | |
537 | retval = vme_slave_get(image[minor].resource, | |
886953e9 EC |
538 | &slave.enable, &slave.vme_addr, |
539 | &slave.size, &pci_addr, &slave.aspace, | |
540 | &slave.cycle); | |
238add52 | 541 | |
1a85f207 | 542 | copied = copy_to_user(argp, &slave, |
238add52 MW |
543 | sizeof(struct vme_slave)); |
544 | if (copied != 0) { | |
0093e5f8 | 545 | pr_warn("Partial copy to userspace\n"); |
238add52 MW |
546 | return -EFAULT; |
547 | } | |
548 | ||
549 | return retval; | |
f00a86d9 | 550 | |
238add52 | 551 | case VME_SET_SLAVE: |
f00a86d9 | 552 | |
1a85f207 | 553 | copied = copy_from_user(&slave, argp, sizeof(slave)); |
238add52 | 554 | if (copied != 0) { |
0093e5f8 | 555 | pr_warn("Partial copy from userspace\n"); |
f00a86d9 MW |
556 | return -EFAULT; |
557 | } | |
558 | ||
238add52 MW |
559 | /* XXX We do not want to push aspace, cycle and width |
560 | * to userspace as they are | |
561 | */ | |
562 | return vme_slave_set(image[minor].resource, | |
563 | slave.enable, slave.vme_addr, slave.size, | |
564 | image[minor].pci_buf, slave.aspace, | |
565 | slave.cycle); | |
566 | ||
f00a86d9 | 567 | break; |
f00a86d9 MW |
568 | } |
569 | break; | |
570 | } | |
571 | ||
572 | return -EINVAL; | |
573 | } | |
574 | ||
b1f2ac07 AB |
575 | static long |
576 | vme_user_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
577 | { | |
578 | int ret; | |
0cd189a4 DK |
579 | struct inode *inode = file_inode(file); |
580 | unsigned int minor = MINOR(inode->i_rdev); | |
b1f2ac07 | 581 | |
0cd189a4 DK |
582 | mutex_lock(&image[minor].mutex); |
583 | ret = vme_user_ioctl(inode, file, cmd, arg); | |
584 | mutex_unlock(&image[minor].mutex); | |
b1f2ac07 AB |
585 | |
586 | return ret; | |
587 | } | |
588 | ||
c74a804f DK |
589 | static void vme_user_vm_open(struct vm_area_struct *vma) |
590 | { | |
591 | struct vme_user_vma_priv *vma_priv = vma->vm_private_data; | |
592 | ||
593 | atomic_inc(&vma_priv->refcnt); | |
594 | } | |
595 | ||
596 | static void vme_user_vm_close(struct vm_area_struct *vma) | |
597 | { | |
598 | struct vme_user_vma_priv *vma_priv = vma->vm_private_data; | |
599 | unsigned int minor = vma_priv->minor; | |
600 | ||
601 | if (!atomic_dec_and_test(&vma_priv->refcnt)) | |
602 | return; | |
603 | ||
604 | mutex_lock(&image[minor].mutex); | |
605 | image[minor].mmap_count--; | |
606 | mutex_unlock(&image[minor].mutex); | |
607 | ||
608 | kfree(vma_priv); | |
609 | } | |
610 | ||
611 | static int vme_user_master_mmap(unsigned int minor, struct vm_area_struct *vma) | |
612 | { | |
613 | int err; | |
614 | struct vme_user_vma_priv *vma_priv; | |
615 | ||
616 | mutex_lock(&image[minor].mutex); | |
617 | ||
618 | err = vme_master_mmap(image[minor].resource, vma); | |
619 | if (err) { | |
620 | mutex_unlock(&image[minor].mutex); | |
621 | return err; | |
622 | } | |
623 | ||
624 | vma_priv = kmalloc(sizeof(struct vme_user_vma_priv), GFP_KERNEL); | |
625 | if (vma_priv == NULL) { | |
626 | mutex_unlock(&image[minor].mutex); | |
627 | return -ENOMEM; | |
628 | } | |
629 | ||
630 | vma_priv->minor = minor; | |
631 | atomic_set(&vma_priv->refcnt, 1); | |
632 | vma->vm_ops = &vme_user_vm_ops; | |
633 | vma->vm_private_data = vma_priv; | |
634 | ||
635 | image[minor].mmap_count++; | |
636 | ||
637 | mutex_unlock(&image[minor].mutex); | |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
642 | static int vme_user_mmap(struct file *file, struct vm_area_struct *vma) | |
643 | { | |
644 | unsigned int minor = MINOR(file_inode(file)->i_rdev); | |
645 | ||
646 | if (type[minor] == MASTER_MINOR) | |
647 | return vme_user_master_mmap(minor, vma); | |
648 | ||
649 | return -ENODEV; | |
650 | } | |
651 | ||
f00a86d9 MW |
652 | |
653 | /* | |
654 | * Unallocate a previously allocated buffer | |
655 | */ | |
45f9f018 | 656 | static void buf_unalloc(int num) |
f00a86d9 MW |
657 | { |
658 | if (image[num].kern_buf) { | |
659 | #ifdef VME_DEBUG | |
0093e5f8 YT |
660 | pr_debug("UniverseII:Releasing buffer at %p\n", |
661 | image[num].pci_buf); | |
f00a86d9 MW |
662 | #endif |
663 | ||
664 | vme_free_consistent(image[num].resource, image[num].size_buf, | |
665 | image[num].kern_buf, image[num].pci_buf); | |
666 | ||
667 | image[num].kern_buf = NULL; | |
668 | image[num].pci_buf = 0; | |
669 | image[num].size_buf = 0; | |
670 | ||
671 | #ifdef VME_DEBUG | |
672 | } else { | |
0093e5f8 | 673 | pr_debug("UniverseII: Buffer not allocated\n"); |
f00a86d9 MW |
674 | #endif |
675 | } | |
676 | } | |
677 | ||
678 | static struct vme_driver vme_user_driver = { | |
45f9f018 | 679 | .name = driver_name, |
5d6abf37 | 680 | .match = vme_user_match, |
45f9f018 | 681 | .probe = vme_user_probe, |
38930755 | 682 | .remove = vme_user_remove, |
f00a86d9 MW |
683 | }; |
684 | ||
685 | ||
238add52 | 686 | static int __init vme_user_init(void) |
f00a86d9 | 687 | { |
238add52 | 688 | int retval = 0; |
238add52 | 689 | |
0093e5f8 | 690 | pr_info("VME User Space Access Driver\n"); |
238add52 MW |
691 | |
692 | if (bus_num == 0) { | |
0093e5f8 | 693 | pr_err("No cards, skipping registration\n"); |
55db5020 | 694 | retval = -ENODEV; |
238add52 MW |
695 | goto err_nocard; |
696 | } | |
697 | ||
698 | /* Let's start by supporting one bus, we can support more than one | |
699 | * in future revisions if that ever becomes necessary. | |
700 | */ | |
0a4b6b02 | 701 | if (bus_num > VME_USER_BUS_MAX) { |
0093e5f8 YT |
702 | pr_err("Driver only able to handle %d buses\n", |
703 | VME_USER_BUS_MAX); | |
0a4b6b02 | 704 | bus_num = VME_USER_BUS_MAX; |
238add52 MW |
705 | } |
706 | ||
5d6abf37 MV |
707 | /* |
708 | * Here we just register the maximum number of devices we can and | |
709 | * leave vme_user_match() to allow only 1 to go through to probe(). | |
710 | * This way, if we later want to allow multiple user access devices, | |
711 | * we just change the code in vme_user_match(). | |
712 | */ | |
713 | retval = vme_register_driver(&vme_user_driver, VME_MAX_SLOTS); | |
238add52 MW |
714 | if (retval != 0) |
715 | goto err_reg; | |
716 | ||
717 | return retval; | |
718 | ||
238add52 | 719 | err_reg: |
238add52 | 720 | err_nocard: |
f00a86d9 MW |
721 | return retval; |
722 | } | |
723 | ||
5d6abf37 MV |
724 | static int vme_user_match(struct vme_dev *vdev) |
725 | { | |
978f47d6 MW |
726 | int i; |
727 | ||
728 | int cur_bus = vme_bus_num(vdev); | |
d7729f0f | 729 | int cur_slot = vme_slot_num(vdev); |
978f47d6 MW |
730 | |
731 | for (i = 0; i < bus_num; i++) | |
732 | if ((cur_bus == bus[i]) && (cur_slot == vdev->num)) | |
733 | return 1; | |
734 | ||
735 | return 0; | |
5d6abf37 MV |
736 | } |
737 | ||
f00a86d9 | 738 | /* |
238add52 MW |
739 | * In this simple access driver, the old behaviour is being preserved as much |
740 | * as practical. We will therefore reserve the buffers and request the images | |
741 | * here so that we don't have to do it later. | |
f00a86d9 | 742 | */ |
d7e530d2 | 743 | static int vme_user_probe(struct vme_dev *vdev) |
f00a86d9 MW |
744 | { |
745 | int i, err; | |
f1552cbd | 746 | char *name; |
f00a86d9 | 747 | |
238add52 MW |
748 | /* Save pointer to the bridge device */ |
749 | if (vme_user_bridge != NULL) { | |
0093e5f8 | 750 | dev_err(&vdev->dev, "Driver can only be loaded for 1 device\n"); |
238add52 MW |
751 | err = -EINVAL; |
752 | goto err_dev; | |
753 | } | |
8f966dc4 | 754 | vme_user_bridge = vdev; |
f00a86d9 MW |
755 | |
756 | /* Initialise descriptors */ | |
757 | for (i = 0; i < VME_DEVS; i++) { | |
758 | image[i].kern_buf = NULL; | |
759 | image[i].pci_buf = 0; | |
ecb3b80f | 760 | mutex_init(&image[i].mutex); |
f00a86d9 MW |
761 | image[i].device = NULL; |
762 | image[i].resource = NULL; | |
763 | image[i].users = 0; | |
764 | } | |
765 | ||
766 | /* Initialise statistics counters */ | |
767 | reset_counters(); | |
768 | ||
769 | /* Assign major and minor numbers for the driver */ | |
770 | err = register_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS, | |
771 | driver_name); | |
772 | if (err) { | |
0093e5f8 YT |
773 | dev_warn(&vdev->dev, "Error getting Major Number %d for driver.\n", |
774 | VME_MAJOR); | |
f00a86d9 MW |
775 | goto err_region; |
776 | } | |
777 | ||
778 | /* Register the driver as a char device */ | |
779 | vme_user_cdev = cdev_alloc(); | |
d4113a69 KAM |
780 | if (!vme_user_cdev) { |
781 | err = -ENOMEM; | |
782 | goto err_char; | |
783 | } | |
f00a86d9 MW |
784 | vme_user_cdev->ops = &vme_user_fops; |
785 | vme_user_cdev->owner = THIS_MODULE; | |
786 | err = cdev_add(vme_user_cdev, MKDEV(VME_MAJOR, 0), VME_DEVS); | |
787 | if (err) { | |
0093e5f8 | 788 | dev_warn(&vdev->dev, "cdev_all failed\n"); |
f00a86d9 MW |
789 | goto err_char; |
790 | } | |
791 | ||
792 | /* Request slave resources and allocate buffers (128kB wide) */ | |
793 | for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { | |
794 | /* XXX Need to properly request attributes */ | |
5188d74c AB |
795 | /* For ca91cx42 bridge there are only two slave windows |
796 | * supporting A16 addressing, so we request A24 supported | |
797 | * by all windows. | |
798 | */ | |
f00a86d9 | 799 | image[i].resource = vme_slave_request(vme_user_bridge, |
5188d74c | 800 | VME_A24, VME_SCT); |
f00a86d9 | 801 | if (image[i].resource == NULL) { |
0093e5f8 YT |
802 | dev_warn(&vdev->dev, |
803 | "Unable to allocate slave resource\n"); | |
465ff28d | 804 | err = -ENOMEM; |
238add52 | 805 | goto err_slave; |
f00a86d9 MW |
806 | } |
807 | image[i].size_buf = PCI_BUF_SIZE; | |
808 | image[i].kern_buf = vme_alloc_consistent(image[i].resource, | |
886953e9 | 809 | image[i].size_buf, &image[i].pci_buf); |
f00a86d9 | 810 | if (image[i].kern_buf == NULL) { |
0093e5f8 YT |
811 | dev_warn(&vdev->dev, |
812 | "Unable to allocate memory for buffer\n"); | |
f00a86d9 MW |
813 | image[i].pci_buf = 0; |
814 | vme_slave_free(image[i].resource); | |
815 | err = -ENOMEM; | |
238add52 | 816 | goto err_slave; |
f00a86d9 MW |
817 | } |
818 | } | |
819 | ||
820 | /* | |
821 | * Request master resources allocate page sized buffers for small | |
822 | * reads and writes | |
823 | */ | |
824 | for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) { | |
825 | /* XXX Need to properly request attributes */ | |
826 | image[i].resource = vme_master_request(vme_user_bridge, | |
827 | VME_A32, VME_SCT, VME_D32); | |
828 | if (image[i].resource == NULL) { | |
0093e5f8 YT |
829 | dev_warn(&vdev->dev, |
830 | "Unable to allocate master resource\n"); | |
465ff28d | 831 | err = -ENOMEM; |
238add52 | 832 | goto err_master; |
f00a86d9 | 833 | } |
33e920d9 AB |
834 | image[i].size_buf = PCI_BUF_SIZE; |
835 | image[i].kern_buf = kmalloc(image[i].size_buf, GFP_KERNEL); | |
836 | if (image[i].kern_buf == NULL) { | |
33e920d9 | 837 | err = -ENOMEM; |
1a524893 DY |
838 | vme_master_free(image[i].resource); |
839 | goto err_master; | |
33e920d9 | 840 | } |
f00a86d9 MW |
841 | } |
842 | ||
843 | /* Create sysfs entries - on udev systems this creates the dev files */ | |
844 | vme_user_sysfs_class = class_create(THIS_MODULE, driver_name); | |
845 | if (IS_ERR(vme_user_sysfs_class)) { | |
0093e5f8 | 846 | dev_err(&vdev->dev, "Error creating vme_user class.\n"); |
f00a86d9 MW |
847 | err = PTR_ERR(vme_user_sysfs_class); |
848 | goto err_class; | |
849 | } | |
850 | ||
851 | /* Add sysfs Entries */ | |
45f9f018 | 852 | for (i = 0; i < VME_DEVS; i++) { |
584721ca | 853 | int num; |
938acb99 | 854 | |
f00a86d9 MW |
855 | switch (type[i]) { |
856 | case MASTER_MINOR: | |
f1552cbd | 857 | name = "bus/vme/m%d"; |
f00a86d9 MW |
858 | break; |
859 | case CONTROL_MINOR: | |
f1552cbd | 860 | name = "bus/vme/ctl"; |
f00a86d9 MW |
861 | break; |
862 | case SLAVE_MINOR: | |
f1552cbd | 863 | name = "bus/vme/s%d"; |
f00a86d9 MW |
864 | break; |
865 | default: | |
866 | err = -EINVAL; | |
867 | goto err_sysfs; | |
f00a86d9 MW |
868 | } |
869 | ||
584721ca VB |
870 | num = (type[i] == SLAVE_MINOR) ? i - (MASTER_MAX + 1) : i; |
871 | image[i].device = device_create(vme_user_sysfs_class, NULL, | |
872 | MKDEV(VME_MAJOR, i), NULL, name, num); | |
f00a86d9 | 873 | if (IS_ERR(image[i].device)) { |
0093e5f8 | 874 | dev_info(&vdev->dev, "Error creating sysfs device\n"); |
f00a86d9 MW |
875 | err = PTR_ERR(image[i].device); |
876 | goto err_sysfs; | |
877 | } | |
878 | } | |
879 | ||
f00a86d9 MW |
880 | return 0; |
881 | ||
f00a86d9 | 882 | err_sysfs: |
45f9f018 | 883 | while (i > 0) { |
f00a86d9 MW |
884 | i--; |
885 | device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); | |
886 | } | |
887 | class_destroy(vme_user_sysfs_class); | |
888 | ||
238add52 MW |
889 | /* Ensure counter set correcty to unalloc all master windows */ |
890 | i = MASTER_MAX + 1; | |
891 | err_master: | |
892 | while (i > MASTER_MINOR) { | |
893 | i--; | |
1a524893 | 894 | kfree(image[i].kern_buf); |
238add52 MW |
895 | vme_master_free(image[i].resource); |
896 | } | |
897 | ||
898 | /* | |
899 | * Ensure counter set correcty to unalloc all slave windows and buffers | |
900 | */ | |
f00a86d9 | 901 | i = SLAVE_MAX + 1; |
238add52 MW |
902 | err_slave: |
903 | while (i > SLAVE_MINOR) { | |
f00a86d9 | 904 | i--; |
f00a86d9 | 905 | buf_unalloc(i); |
1daa38d3 | 906 | vme_slave_free(image[i].resource); |
f00a86d9 MW |
907 | } |
908 | err_class: | |
909 | cdev_del(vme_user_cdev); | |
910 | err_char: | |
911 | unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); | |
912 | err_region: | |
238add52 | 913 | err_dev: |
f00a86d9 MW |
914 | return err; |
915 | } | |
916 | ||
f21a8247 | 917 | static int vme_user_remove(struct vme_dev *dev) |
f00a86d9 MW |
918 | { |
919 | int i; | |
920 | ||
921 | /* Remove sysfs Entries */ | |
ecb3b80f SN |
922 | for (i = 0; i < VME_DEVS; i++) { |
923 | mutex_destroy(&image[i].mutex); | |
f00a86d9 | 924 | device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); |
ecb3b80f | 925 | } |
f00a86d9 MW |
926 | class_destroy(vme_user_sysfs_class); |
927 | ||
b62c99b1 | 928 | for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) { |
33e920d9 | 929 | kfree(image[i].kern_buf); |
b62c99b1 EC |
930 | vme_master_free(image[i].resource); |
931 | } | |
33e920d9 | 932 | |
f00a86d9 | 933 | for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { |
238add52 | 934 | vme_slave_set(image[i].resource, 0, 0, 0, 0, VME_A32, 0); |
f00a86d9 | 935 | buf_unalloc(i); |
1daa38d3 | 936 | vme_slave_free(image[i].resource); |
f00a86d9 MW |
937 | } |
938 | ||
939 | /* Unregister device driver */ | |
940 | cdev_del(vme_user_cdev); | |
941 | ||
942 | /* Unregiser the major and minor device numbers */ | |
943 | unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); | |
238add52 MW |
944 | |
945 | return 0; | |
f00a86d9 MW |
946 | } |
947 | ||
238add52 MW |
948 | static void __exit vme_user_exit(void) |
949 | { | |
950 | vme_unregister_driver(&vme_user_driver); | |
238add52 MW |
951 | } |
952 | ||
953 | ||
954 | MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the driver is connected"); | |
955 | module_param_array(bus, int, &bus_num, 0); | |
956 | ||
f00a86d9 | 957 | MODULE_DESCRIPTION("VME User Space Access Driver"); |
66bd8db5 | 958 | MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com"); |
f00a86d9 MW |
959 | MODULE_LICENSE("GPL"); |
960 | ||
238add52 MW |
961 | module_init(vme_user_init); |
962 | module_exit(vme_user_exit); |