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 | 123 | static ssize_t resource_to_user(int minor, char __user *buf, size_t count, |
86eadace | 124 | loff_t *ppos) |
f00a86d9 | 125 | { |
f00a86d9 MW |
126 | ssize_t copied = 0; |
127 | ||
8e4d138c DK |
128 | if (count > image[minor].size_buf) |
129 | count = image[minor].size_buf; | |
130 | ||
8e4d138c DK |
131 | copied = vme_master_read(image[minor].resource, image[minor].kern_buf, |
132 | count, *ppos); | |
133 | if (copied < 0) | |
134 | return (int)copied; | |
135 | ||
7c78e0cd DK |
136 | if (__copy_to_user(buf, image[minor].kern_buf, (unsigned long)copied)) |
137 | return -EFAULT; | |
f00a86d9 MW |
138 | |
139 | return copied; | |
140 | } | |
141 | ||
1a85f207 | 142 | static ssize_t resource_from_user(unsigned int minor, const char __user *buf, |
86eadace | 143 | size_t count, loff_t *ppos) |
f00a86d9 | 144 | { |
8e4d138c DK |
145 | if (count > image[minor].size_buf) |
146 | count = image[minor].size_buf; | |
147 | ||
7c78e0cd DK |
148 | if (__copy_from_user(image[minor].kern_buf, buf, (unsigned long)count)) |
149 | return -EFAULT; | |
8e4d138c | 150 | |
457ab286 DK |
151 | return vme_master_write(image[minor].resource, image[minor].kern_buf, |
152 | count, *ppos); | |
f00a86d9 MW |
153 | } |
154 | ||
155 | static ssize_t buffer_to_user(unsigned int minor, char __user *buf, | |
86eadace | 156 | size_t count, loff_t *ppos) |
f00a86d9 | 157 | { |
0a81a0f7 | 158 | void *image_ptr; |
f00a86d9 MW |
159 | |
160 | image_ptr = image[minor].kern_buf + *ppos; | |
7c78e0cd DK |
161 | if (__copy_to_user(buf, image_ptr, (unsigned long)count)) |
162 | return -EFAULT; | |
f00a86d9 | 163 | |
7c78e0cd | 164 | return count; |
f00a86d9 MW |
165 | } |
166 | ||
1a85f207 | 167 | static ssize_t buffer_from_user(unsigned int minor, const char __user *buf, |
86eadace | 168 | size_t count, loff_t *ppos) |
f00a86d9 | 169 | { |
0a81a0f7 | 170 | void *image_ptr; |
f00a86d9 MW |
171 | |
172 | image_ptr = image[minor].kern_buf + *ppos; | |
7c78e0cd DK |
173 | if (__copy_from_user(image_ptr, buf, (unsigned long)count)) |
174 | return -EFAULT; | |
f00a86d9 | 175 | |
7c78e0cd | 176 | return count; |
f00a86d9 MW |
177 | } |
178 | ||
1a85f207 | 179 | static ssize_t vme_user_read(struct file *file, char __user *buf, size_t count, |
86eadace | 180 | loff_t *ppos) |
f00a86d9 | 181 | { |
496ad9aa | 182 | unsigned int minor = MINOR(file_inode(file)->i_rdev); |
f00a86d9 MW |
183 | ssize_t retval; |
184 | size_t image_size; | |
f00a86d9 | 185 | |
05614fbf VB |
186 | if (minor == CONTROL_MINOR) |
187 | return 0; | |
188 | ||
ecb3b80f | 189 | mutex_lock(&image[minor].mutex); |
f00a86d9 MW |
190 | |
191 | /* XXX Do we *really* want this helper - we can use vme_*_get ? */ | |
192 | image_size = vme_get_size(image[minor].resource); | |
193 | ||
194 | /* Ensure we are starting at a valid location */ | |
195 | if ((*ppos < 0) || (*ppos > (image_size - 1))) { | |
ecb3b80f | 196 | mutex_unlock(&image[minor].mutex); |
f00a86d9 MW |
197 | return 0; |
198 | } | |
199 | ||
200 | /* Ensure not reading past end of the image */ | |
201 | if (*ppos + count > image_size) | |
32491f56 | 202 | count = image_size - *ppos; |
f00a86d9 | 203 | |
45f9f018 | 204 | switch (type[minor]) { |
f00a86d9 | 205 | case MASTER_MINOR: |
32491f56 | 206 | retval = resource_to_user(minor, buf, count, ppos); |
f00a86d9 MW |
207 | break; |
208 | case SLAVE_MINOR: | |
32491f56 | 209 | retval = buffer_to_user(minor, buf, count, ppos); |
f00a86d9 MW |
210 | break; |
211 | default: | |
212 | retval = -EINVAL; | |
213 | } | |
214 | ||
ecb3b80f | 215 | mutex_unlock(&image[minor].mutex); |
f00a86d9 MW |
216 | if (retval > 0) |
217 | *ppos += retval; | |
218 | ||
219 | return retval; | |
220 | } | |
221 | ||
1a85f207 | 222 | static ssize_t vme_user_write(struct file *file, const char __user *buf, |
86eadace | 223 | size_t count, loff_t *ppos) |
f00a86d9 | 224 | { |
496ad9aa | 225 | unsigned int minor = MINOR(file_inode(file)->i_rdev); |
f00a86d9 MW |
226 | ssize_t retval; |
227 | size_t image_size; | |
f00a86d9 | 228 | |
05614fbf VB |
229 | if (minor == CONTROL_MINOR) |
230 | return 0; | |
231 | ||
ecb3b80f | 232 | mutex_lock(&image[minor].mutex); |
f00a86d9 MW |
233 | |
234 | image_size = vme_get_size(image[minor].resource); | |
235 | ||
236 | /* Ensure we are starting at a valid location */ | |
237 | if ((*ppos < 0) || (*ppos > (image_size - 1))) { | |
ecb3b80f | 238 | mutex_unlock(&image[minor].mutex); |
f00a86d9 MW |
239 | return 0; |
240 | } | |
241 | ||
242 | /* Ensure not reading past end of the image */ | |
243 | if (*ppos + count > image_size) | |
32491f56 | 244 | count = image_size - *ppos; |
f00a86d9 | 245 | |
45f9f018 | 246 | switch (type[minor]) { |
f00a86d9 | 247 | case MASTER_MINOR: |
32491f56 | 248 | retval = resource_from_user(minor, buf, count, ppos); |
f00a86d9 MW |
249 | break; |
250 | case SLAVE_MINOR: | |
32491f56 | 251 | retval = buffer_from_user(minor, buf, count, ppos); |
f00a86d9 MW |
252 | break; |
253 | default: | |
254 | retval = -EINVAL; | |
255 | } | |
538a697a | 256 | |
ecb3b80f | 257 | mutex_unlock(&image[minor].mutex); |
f00a86d9 MW |
258 | |
259 | if (retval > 0) | |
260 | *ppos += retval; | |
261 | ||
262 | return retval; | |
263 | } | |
264 | ||
265 | static loff_t vme_user_llseek(struct file *file, loff_t off, int whence) | |
266 | { | |
496ad9aa | 267 | unsigned int minor = MINOR(file_inode(file)->i_rdev); |
877de4b4 | 268 | size_t image_size; |
59482291 | 269 | loff_t res; |
877de4b4 | 270 | |
615c40dd DK |
271 | switch (type[minor]) { |
272 | case MASTER_MINOR: | |
273 | case SLAVE_MINOR: | |
274 | mutex_lock(&image[minor].mutex); | |
275 | image_size = vme_get_size(image[minor].resource); | |
276 | res = fixed_size_llseek(file, off, whence, image_size); | |
277 | mutex_unlock(&image[minor].mutex); | |
278 | return res; | |
279 | } | |
877de4b4 | 280 | |
615c40dd | 281 | return -EINVAL; |
f00a86d9 MW |
282 | } |
283 | ||
238add52 MW |
284 | /* |
285 | * The ioctls provided by the old VME access method (the one at vmelinux.org) | |
286 | * are most certainly wrong as the effectively push the registers layout | |
287 | * through to user space. Given that the VME core can handle multiple bridges, | |
288 | * with different register layouts this is most certainly not the way to go. | |
289 | * | |
290 | * We aren't using the structures defined in the Motorola driver either - these | |
291 | * are also quite low level, however we should use the definitions that have | |
292 | * already been defined. | |
293 | */ | |
f00a86d9 | 294 | static int vme_user_ioctl(struct inode *inode, struct file *file, |
86eadace | 295 | unsigned int cmd, unsigned long arg) |
f00a86d9 | 296 | { |
238add52 MW |
297 | struct vme_master master; |
298 | struct vme_slave slave; | |
dca22184 | 299 | struct vme_irq_id irq_req; |
238add52 | 300 | unsigned long copied; |
f00a86d9 | 301 | unsigned int minor = MINOR(inode->i_rdev); |
238add52 MW |
302 | int retval; |
303 | dma_addr_t pci_addr; | |
1a85f207 | 304 | void __user *argp = (void __user *)arg; |
f00a86d9 | 305 | |
f00a86d9 MW |
306 | switch (type[minor]) { |
307 | case CONTROL_MINOR: | |
dca22184 VB |
308 | switch (cmd) { |
309 | case VME_IRQ_GEN: | |
a7f3943c | 310 | copied = copy_from_user(&irq_req, argp, |
dca22184 VB |
311 | sizeof(struct vme_irq_id)); |
312 | if (copied != 0) { | |
0093e5f8 | 313 | pr_warn("Partial copy from userspace\n"); |
dca22184 VB |
314 | return -EFAULT; |
315 | } | |
316 | ||
fc489a52 | 317 | return vme_irq_generate(vme_user_bridge, |
dca22184 VB |
318 | irq_req.level, |
319 | irq_req.statid); | |
dca22184 | 320 | } |
f00a86d9 MW |
321 | break; |
322 | case MASTER_MINOR: | |
f00a86d9 | 323 | switch (cmd) { |
238add52 MW |
324 | case VME_GET_MASTER: |
325 | memset(&master, 0, sizeof(struct vme_master)); | |
326 | ||
327 | /* XXX We do not want to push aspace, cycle and width | |
328 | * to userspace as they are | |
329 | */ | |
330 | retval = vme_master_get(image[minor].resource, | |
86eadace DK |
331 | &master.enable, |
332 | &master.vme_addr, | |
333 | &master.size, &master.aspace, | |
334 | &master.cycle, &master.dwidth); | |
238add52 | 335 | |
1a85f207 | 336 | copied = copy_to_user(argp, &master, |
86eadace | 337 | sizeof(struct vme_master)); |
238add52 | 338 | if (copied != 0) { |
0093e5f8 | 339 | pr_warn("Partial copy to userspace\n"); |
238add52 MW |
340 | return -EFAULT; |
341 | } | |
f00a86d9 | 342 | |
238add52 | 343 | return retval; |
238add52 MW |
344 | |
345 | case VME_SET_MASTER: | |
346 | ||
c74a804f DK |
347 | if (image[minor].mmap_count != 0) { |
348 | pr_warn("Can't adjust mapped window\n"); | |
349 | return -EPERM; | |
350 | } | |
351 | ||
1a85f207 | 352 | copied = copy_from_user(&master, argp, sizeof(master)); |
238add52 | 353 | if (copied != 0) { |
0093e5f8 | 354 | pr_warn("Partial copy from userspace\n"); |
f00a86d9 MW |
355 | return -EFAULT; |
356 | } | |
357 | ||
238add52 MW |
358 | /* XXX We do not want to push aspace, cycle and width |
359 | * to userspace as they are | |
360 | */ | |
361 | return vme_master_set(image[minor].resource, | |
362 | master.enable, master.vme_addr, master.size, | |
363 | master.aspace, master.cycle, master.dwidth); | |
f00a86d9 MW |
364 | |
365 | break; | |
238add52 MW |
366 | } |
367 | break; | |
368 | case SLAVE_MINOR: | |
369 | switch (cmd) { | |
f00a86d9 | 370 | case VME_GET_SLAVE: |
238add52 MW |
371 | memset(&slave, 0, sizeof(struct vme_slave)); |
372 | ||
373 | /* XXX We do not want to push aspace, cycle and width | |
374 | * to userspace as they are | |
375 | */ | |
376 | retval = vme_slave_get(image[minor].resource, | |
86eadace DK |
377 | &slave.enable, &slave.vme_addr, |
378 | &slave.size, &pci_addr, | |
379 | &slave.aspace, &slave.cycle); | |
238add52 | 380 | |
1a85f207 | 381 | copied = copy_to_user(argp, &slave, |
86eadace | 382 | sizeof(struct vme_slave)); |
238add52 | 383 | if (copied != 0) { |
0093e5f8 | 384 | pr_warn("Partial copy to userspace\n"); |
238add52 MW |
385 | return -EFAULT; |
386 | } | |
387 | ||
388 | return retval; | |
f00a86d9 | 389 | |
238add52 | 390 | case VME_SET_SLAVE: |
f00a86d9 | 391 | |
1a85f207 | 392 | copied = copy_from_user(&slave, argp, sizeof(slave)); |
238add52 | 393 | if (copied != 0) { |
0093e5f8 | 394 | pr_warn("Partial copy from userspace\n"); |
f00a86d9 MW |
395 | return -EFAULT; |
396 | } | |
397 | ||
238add52 MW |
398 | /* XXX We do not want to push aspace, cycle and width |
399 | * to userspace as they are | |
400 | */ | |
401 | return vme_slave_set(image[minor].resource, | |
402 | slave.enable, slave.vme_addr, slave.size, | |
403 | image[minor].pci_buf, slave.aspace, | |
404 | slave.cycle); | |
405 | ||
f00a86d9 | 406 | break; |
f00a86d9 MW |
407 | } |
408 | break; | |
409 | } | |
410 | ||
411 | return -EINVAL; | |
412 | } | |
413 | ||
b1f2ac07 AB |
414 | static long |
415 | vme_user_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
416 | { | |
417 | int ret; | |
0cd189a4 DK |
418 | struct inode *inode = file_inode(file); |
419 | unsigned int minor = MINOR(inode->i_rdev); | |
b1f2ac07 | 420 | |
0cd189a4 DK |
421 | mutex_lock(&image[minor].mutex); |
422 | ret = vme_user_ioctl(inode, file, cmd, arg); | |
423 | mutex_unlock(&image[minor].mutex); | |
b1f2ac07 AB |
424 | |
425 | return ret; | |
426 | } | |
427 | ||
c74a804f DK |
428 | static void vme_user_vm_open(struct vm_area_struct *vma) |
429 | { | |
430 | struct vme_user_vma_priv *vma_priv = vma->vm_private_data; | |
431 | ||
432 | atomic_inc(&vma_priv->refcnt); | |
433 | } | |
434 | ||
435 | static void vme_user_vm_close(struct vm_area_struct *vma) | |
436 | { | |
437 | struct vme_user_vma_priv *vma_priv = vma->vm_private_data; | |
438 | unsigned int minor = vma_priv->minor; | |
439 | ||
440 | if (!atomic_dec_and_test(&vma_priv->refcnt)) | |
441 | return; | |
442 | ||
443 | mutex_lock(&image[minor].mutex); | |
444 | image[minor].mmap_count--; | |
445 | mutex_unlock(&image[minor].mutex); | |
446 | ||
447 | kfree(vma_priv); | |
448 | } | |
449 | ||
e4aea6aa DK |
450 | static const struct vm_operations_struct vme_user_vm_ops = { |
451 | .open = vme_user_vm_open, | |
452 | .close = vme_user_vm_close, | |
453 | }; | |
454 | ||
c74a804f DK |
455 | static int vme_user_master_mmap(unsigned int minor, struct vm_area_struct *vma) |
456 | { | |
457 | int err; | |
458 | struct vme_user_vma_priv *vma_priv; | |
459 | ||
460 | mutex_lock(&image[minor].mutex); | |
461 | ||
462 | err = vme_master_mmap(image[minor].resource, vma); | |
463 | if (err) { | |
464 | mutex_unlock(&image[minor].mutex); | |
465 | return err; | |
466 | } | |
467 | ||
1f0622de | 468 | vma_priv = kmalloc(sizeof(*vma_priv), GFP_KERNEL); |
f99b71be | 469 | if (!vma_priv) { |
c74a804f DK |
470 | mutex_unlock(&image[minor].mutex); |
471 | return -ENOMEM; | |
472 | } | |
473 | ||
474 | vma_priv->minor = minor; | |
475 | atomic_set(&vma_priv->refcnt, 1); | |
476 | vma->vm_ops = &vme_user_vm_ops; | |
477 | vma->vm_private_data = vma_priv; | |
478 | ||
479 | image[minor].mmap_count++; | |
480 | ||
481 | mutex_unlock(&image[minor].mutex); | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
486 | static int vme_user_mmap(struct file *file, struct vm_area_struct *vma) | |
487 | { | |
488 | unsigned int minor = MINOR(file_inode(file)->i_rdev); | |
489 | ||
490 | if (type[minor] == MASTER_MINOR) | |
491 | return vme_user_master_mmap(minor, vma); | |
492 | ||
493 | return -ENODEV; | |
494 | } | |
495 | ||
e4aea6aa | 496 | static const struct file_operations vme_user_fops = { |
e4aea6aa DK |
497 | .read = vme_user_read, |
498 | .write = vme_user_write, | |
499 | .llseek = vme_user_llseek, | |
500 | .unlocked_ioctl = vme_user_unlocked_ioctl, | |
501 | .compat_ioctl = vme_user_unlocked_ioctl, | |
502 | .mmap = vme_user_mmap, | |
503 | }; | |
f00a86d9 | 504 | |
5d6abf37 MV |
505 | static int vme_user_match(struct vme_dev *vdev) |
506 | { | |
978f47d6 MW |
507 | int i; |
508 | ||
509 | int cur_bus = vme_bus_num(vdev); | |
d7729f0f | 510 | int cur_slot = vme_slot_num(vdev); |
978f47d6 MW |
511 | |
512 | for (i = 0; i < bus_num; i++) | |
513 | if ((cur_bus == bus[i]) && (cur_slot == vdev->num)) | |
514 | return 1; | |
515 | ||
516 | return 0; | |
5d6abf37 MV |
517 | } |
518 | ||
f00a86d9 | 519 | /* |
238add52 MW |
520 | * In this simple access driver, the old behaviour is being preserved as much |
521 | * as practical. We will therefore reserve the buffers and request the images | |
522 | * here so that we don't have to do it later. | |
f00a86d9 | 523 | */ |
d7e530d2 | 524 | static int vme_user_probe(struct vme_dev *vdev) |
f00a86d9 MW |
525 | { |
526 | int i, err; | |
f1552cbd | 527 | char *name; |
f00a86d9 | 528 | |
238add52 | 529 | /* Save pointer to the bridge device */ |
f99b71be | 530 | if (vme_user_bridge) { |
0093e5f8 | 531 | dev_err(&vdev->dev, "Driver can only be loaded for 1 device\n"); |
238add52 MW |
532 | err = -EINVAL; |
533 | goto err_dev; | |
534 | } | |
8f966dc4 | 535 | vme_user_bridge = vdev; |
f00a86d9 MW |
536 | |
537 | /* Initialise descriptors */ | |
538 | for (i = 0; i < VME_DEVS; i++) { | |
539 | image[i].kern_buf = NULL; | |
540 | image[i].pci_buf = 0; | |
ecb3b80f | 541 | mutex_init(&image[i].mutex); |
f00a86d9 MW |
542 | image[i].device = NULL; |
543 | image[i].resource = NULL; | |
f00a86d9 MW |
544 | } |
545 | ||
f00a86d9 MW |
546 | /* Assign major and minor numbers for the driver */ |
547 | err = register_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS, | |
86eadace | 548 | driver_name); |
f00a86d9 | 549 | if (err) { |
0093e5f8 YT |
550 | dev_warn(&vdev->dev, "Error getting Major Number %d for driver.\n", |
551 | VME_MAJOR); | |
f00a86d9 MW |
552 | goto err_region; |
553 | } | |
554 | ||
555 | /* Register the driver as a char device */ | |
556 | vme_user_cdev = cdev_alloc(); | |
d4113a69 KAM |
557 | if (!vme_user_cdev) { |
558 | err = -ENOMEM; | |
559 | goto err_char; | |
560 | } | |
f00a86d9 MW |
561 | vme_user_cdev->ops = &vme_user_fops; |
562 | vme_user_cdev->owner = THIS_MODULE; | |
563 | err = cdev_add(vme_user_cdev, MKDEV(VME_MAJOR, 0), VME_DEVS); | |
44ae5443 | 564 | if (err) |
f00a86d9 | 565 | goto err_char; |
f00a86d9 MW |
566 | |
567 | /* Request slave resources and allocate buffers (128kB wide) */ | |
568 | for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { | |
569 | /* XXX Need to properly request attributes */ | |
5188d74c AB |
570 | /* For ca91cx42 bridge there are only two slave windows |
571 | * supporting A16 addressing, so we request A24 supported | |
572 | * by all windows. | |
573 | */ | |
f00a86d9 | 574 | image[i].resource = vme_slave_request(vme_user_bridge, |
5188d74c | 575 | VME_A24, VME_SCT); |
f99b71be | 576 | if (!image[i].resource) { |
0093e5f8 YT |
577 | dev_warn(&vdev->dev, |
578 | "Unable to allocate slave resource\n"); | |
465ff28d | 579 | err = -ENOMEM; |
238add52 | 580 | goto err_slave; |
f00a86d9 MW |
581 | } |
582 | image[i].size_buf = PCI_BUF_SIZE; | |
583 | image[i].kern_buf = vme_alloc_consistent(image[i].resource, | |
886953e9 | 584 | image[i].size_buf, &image[i].pci_buf); |
f99b71be | 585 | if (!image[i].kern_buf) { |
0093e5f8 YT |
586 | dev_warn(&vdev->dev, |
587 | "Unable to allocate memory for buffer\n"); | |
f00a86d9 MW |
588 | image[i].pci_buf = 0; |
589 | vme_slave_free(image[i].resource); | |
590 | err = -ENOMEM; | |
238add52 | 591 | goto err_slave; |
f00a86d9 MW |
592 | } |
593 | } | |
594 | ||
595 | /* | |
596 | * Request master resources allocate page sized buffers for small | |
597 | * reads and writes | |
598 | */ | |
599 | for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) { | |
600 | /* XXX Need to properly request attributes */ | |
601 | image[i].resource = vme_master_request(vme_user_bridge, | |
602 | VME_A32, VME_SCT, VME_D32); | |
f99b71be | 603 | if (!image[i].resource) { |
0093e5f8 YT |
604 | dev_warn(&vdev->dev, |
605 | "Unable to allocate master resource\n"); | |
465ff28d | 606 | err = -ENOMEM; |
238add52 | 607 | goto err_master; |
f00a86d9 | 608 | } |
33e920d9 AB |
609 | image[i].size_buf = PCI_BUF_SIZE; |
610 | image[i].kern_buf = kmalloc(image[i].size_buf, GFP_KERNEL); | |
f99b71be | 611 | if (!image[i].kern_buf) { |
33e920d9 | 612 | err = -ENOMEM; |
1a524893 DY |
613 | vme_master_free(image[i].resource); |
614 | goto err_master; | |
33e920d9 | 615 | } |
f00a86d9 MW |
616 | } |
617 | ||
618 | /* Create sysfs entries - on udev systems this creates the dev files */ | |
619 | vme_user_sysfs_class = class_create(THIS_MODULE, driver_name); | |
620 | if (IS_ERR(vme_user_sysfs_class)) { | |
0093e5f8 | 621 | dev_err(&vdev->dev, "Error creating vme_user class.\n"); |
f00a86d9 MW |
622 | err = PTR_ERR(vme_user_sysfs_class); |
623 | goto err_class; | |
624 | } | |
625 | ||
626 | /* Add sysfs Entries */ | |
45f9f018 | 627 | for (i = 0; i < VME_DEVS; i++) { |
584721ca | 628 | int num; |
938acb99 | 629 | |
f00a86d9 MW |
630 | switch (type[i]) { |
631 | case MASTER_MINOR: | |
f1552cbd | 632 | name = "bus/vme/m%d"; |
f00a86d9 MW |
633 | break; |
634 | case CONTROL_MINOR: | |
f1552cbd | 635 | name = "bus/vme/ctl"; |
f00a86d9 MW |
636 | break; |
637 | case SLAVE_MINOR: | |
f1552cbd | 638 | name = "bus/vme/s%d"; |
f00a86d9 MW |
639 | break; |
640 | default: | |
641 | err = -EINVAL; | |
642 | goto err_sysfs; | |
f00a86d9 MW |
643 | } |
644 | ||
584721ca VB |
645 | num = (type[i] == SLAVE_MINOR) ? i - (MASTER_MAX + 1) : i; |
646 | image[i].device = device_create(vme_user_sysfs_class, NULL, | |
647 | MKDEV(VME_MAJOR, i), NULL, name, num); | |
f00a86d9 | 648 | if (IS_ERR(image[i].device)) { |
0093e5f8 | 649 | dev_info(&vdev->dev, "Error creating sysfs device\n"); |
f00a86d9 MW |
650 | err = PTR_ERR(image[i].device); |
651 | goto err_sysfs; | |
652 | } | |
653 | } | |
654 | ||
f00a86d9 MW |
655 | return 0; |
656 | ||
f00a86d9 | 657 | err_sysfs: |
45f9f018 | 658 | while (i > 0) { |
f00a86d9 MW |
659 | i--; |
660 | device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); | |
661 | } | |
662 | class_destroy(vme_user_sysfs_class); | |
663 | ||
238add52 MW |
664 | /* Ensure counter set correcty to unalloc all master windows */ |
665 | i = MASTER_MAX + 1; | |
666 | err_master: | |
667 | while (i > MASTER_MINOR) { | |
668 | i--; | |
1a524893 | 669 | kfree(image[i].kern_buf); |
238add52 MW |
670 | vme_master_free(image[i].resource); |
671 | } | |
672 | ||
673 | /* | |
674 | * Ensure counter set correcty to unalloc all slave windows and buffers | |
675 | */ | |
f00a86d9 | 676 | i = SLAVE_MAX + 1; |
238add52 MW |
677 | err_slave: |
678 | while (i > SLAVE_MINOR) { | |
f00a86d9 | 679 | i--; |
625a9e01 DK |
680 | vme_free_consistent(image[i].resource, image[i].size_buf, |
681 | image[i].kern_buf, image[i].pci_buf); | |
1daa38d3 | 682 | vme_slave_free(image[i].resource); |
f00a86d9 MW |
683 | } |
684 | err_class: | |
685 | cdev_del(vme_user_cdev); | |
686 | err_char: | |
687 | unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); | |
688 | err_region: | |
238add52 | 689 | err_dev: |
f00a86d9 MW |
690 | return err; |
691 | } | |
692 | ||
f21a8247 | 693 | static int vme_user_remove(struct vme_dev *dev) |
f00a86d9 MW |
694 | { |
695 | int i; | |
696 | ||
697 | /* Remove sysfs Entries */ | |
ecb3b80f SN |
698 | for (i = 0; i < VME_DEVS; i++) { |
699 | mutex_destroy(&image[i].mutex); | |
f00a86d9 | 700 | device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); |
ecb3b80f | 701 | } |
f00a86d9 MW |
702 | class_destroy(vme_user_sysfs_class); |
703 | ||
b62c99b1 | 704 | for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) { |
33e920d9 | 705 | kfree(image[i].kern_buf); |
b62c99b1 EC |
706 | vme_master_free(image[i].resource); |
707 | } | |
33e920d9 | 708 | |
f00a86d9 | 709 | for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { |
238add52 | 710 | vme_slave_set(image[i].resource, 0, 0, 0, 0, VME_A32, 0); |
625a9e01 DK |
711 | vme_free_consistent(image[i].resource, image[i].size_buf, |
712 | image[i].kern_buf, image[i].pci_buf); | |
1daa38d3 | 713 | vme_slave_free(image[i].resource); |
f00a86d9 MW |
714 | } |
715 | ||
716 | /* Unregister device driver */ | |
717 | cdev_del(vme_user_cdev); | |
718 | ||
719 | /* Unregiser the major and minor device numbers */ | |
720 | unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); | |
238add52 MW |
721 | |
722 | return 0; | |
f00a86d9 MW |
723 | } |
724 | ||
e4aea6aa DK |
725 | static struct vme_driver vme_user_driver = { |
726 | .name = driver_name, | |
727 | .match = vme_user_match, | |
728 | .probe = vme_user_probe, | |
729 | .remove = vme_user_remove, | |
730 | }; | |
731 | ||
732 | static int __init vme_user_init(void) | |
733 | { | |
734 | int retval = 0; | |
735 | ||
736 | pr_info("VME User Space Access Driver\n"); | |
737 | ||
738 | if (bus_num == 0) { | |
739 | pr_err("No cards, skipping registration\n"); | |
740 | retval = -ENODEV; | |
741 | goto err_nocard; | |
742 | } | |
743 | ||
744 | /* Let's start by supporting one bus, we can support more than one | |
745 | * in future revisions if that ever becomes necessary. | |
746 | */ | |
747 | if (bus_num > VME_USER_BUS_MAX) { | |
748 | pr_err("Driver only able to handle %d buses\n", | |
749 | VME_USER_BUS_MAX); | |
750 | bus_num = VME_USER_BUS_MAX; | |
751 | } | |
752 | ||
753 | /* | |
754 | * Here we just register the maximum number of devices we can and | |
755 | * leave vme_user_match() to allow only 1 to go through to probe(). | |
756 | * This way, if we later want to allow multiple user access devices, | |
757 | * we just change the code in vme_user_match(). | |
758 | */ | |
759 | retval = vme_register_driver(&vme_user_driver, VME_MAX_SLOTS); | |
760 | if (retval != 0) | |
761 | goto err_reg; | |
762 | ||
763 | return retval; | |
764 | ||
765 | err_reg: | |
766 | err_nocard: | |
767 | return retval; | |
768 | } | |
769 | ||
238add52 MW |
770 | static void __exit vme_user_exit(void) |
771 | { | |
772 | vme_unregister_driver(&vme_user_driver); | |
238add52 MW |
773 | } |
774 | ||
238add52 MW |
775 | MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the driver is connected"); |
776 | module_param_array(bus, int, &bus_num, 0); | |
777 | ||
f00a86d9 | 778 | MODULE_DESCRIPTION("VME User Space Access Driver"); |
66bd8db5 | 779 | MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com"); |
f00a86d9 MW |
780 | MODULE_LICENSE("GPL"); |
781 | ||
238add52 MW |
782 | module_init(vme_user_init); |
783 | module_exit(vme_user_exit); |