1
2
3
4
5
6
7
8
9
10
11
12
13
14
15#include <linux/compat.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/device.h>
19#include <linux/pci.h>
20#include <linux/fs.h>
21#include <linux/poll.h>
22#include <linux/interrupt.h>
23#include <linux/cdev.h>
24#include <linux/phantom.h>
25#include <linux/sched.h>
26#include <linux/smp_lock.h>
27
28#include <asm/atomic.h>
29#include <asm/io.h>
30
31#define PHANTOM_VERSION "n0.9.8"
32
33#define PHANTOM_MAX_MINORS 8
34
35#define PHN_IRQCTL 0x4c
36
37#define PHB_RUNNING 1
38#define PHB_NOT_OH 2
39
40static struct class *phantom_class;
41static int phantom_major;
42
43struct phantom_device {
44 unsigned int opened;
45 void __iomem *caddr;
46 u32 __iomem *iaddr;
47 u32 __iomem *oaddr;
48 unsigned long status;
49 atomic_t counter;
50
51 wait_queue_head_t wait;
52 struct cdev cdev;
53
54 struct mutex open_lock;
55 spinlock_t regs_lock;
56
57
58 struct phm_regs oregs;
59 u32 ctl_reg;
60};
61
62static unsigned char phantom_devices[PHANTOM_MAX_MINORS];
63
64static int phantom_status(struct phantom_device *dev, unsigned long newstat)
65{
66 pr_debug("phantom_status %lx %lx\n", dev->status, newstat);
67
68 if (!(dev->status & PHB_RUNNING) && (newstat & PHB_RUNNING)) {
69 atomic_set(&dev->counter, 0);
70 iowrite32(PHN_CTL_IRQ, dev->iaddr + PHN_CONTROL);
71 iowrite32(0x43, dev->caddr + PHN_IRQCTL);
72 ioread32(dev->caddr + PHN_IRQCTL);
73 } else if ((dev->status & PHB_RUNNING) && !(newstat & PHB_RUNNING)) {
74 iowrite32(0, dev->caddr + PHN_IRQCTL);
75 ioread32(dev->caddr + PHN_IRQCTL);
76 }
77
78 dev->status = newstat;
79
80 return 0;
81}
82
83
84
85
86
87static long phantom_ioctl(struct file *file, unsigned int cmd,
88 unsigned long arg)
89{
90 struct phantom_device *dev = file->private_data;
91 struct phm_regs rs;
92 struct phm_reg r;
93 void __user *argp = (void __user *)arg;
94 unsigned long flags;
95 unsigned int i;
96
97 switch (cmd) {
98 case PHN_SETREG:
99 case PHN_SET_REG:
100 if (copy_from_user(&r, argp, sizeof(r)))
101 return -EFAULT;
102
103 if (r.reg > 7)
104 return -EINVAL;
105
106 spin_lock_irqsave(&dev->regs_lock, flags);
107 if (r.reg == PHN_CONTROL && (r.value & PHN_CTL_IRQ) &&
108 phantom_status(dev, dev->status | PHB_RUNNING)){
109 spin_unlock_irqrestore(&dev->regs_lock, flags);
110 return -ENODEV;
111 }
112
113 pr_debug("phantom: writing %x to %u\n", r.value, r.reg);
114
115
116 if (r.reg == PHN_CONTROL && (dev->status & PHB_NOT_OH)) {
117 r.value &= ~PHN_CTL_AMP;
118 r.value |= dev->ctl_reg & PHN_CTL_AMP;
119 dev->ctl_reg = r.value;
120 }
121
122 iowrite32(r.value, dev->iaddr + r.reg);
123 ioread32(dev->iaddr);
124
125 if (r.reg == PHN_CONTROL && !(r.value & PHN_CTL_IRQ))
126 phantom_status(dev, dev->status & ~PHB_RUNNING);
127 spin_unlock_irqrestore(&dev->regs_lock, flags);
128 break;
129 case PHN_SETREGS:
130 case PHN_SET_REGS:
131 if (copy_from_user(&rs, argp, sizeof(rs)))
132 return -EFAULT;
133
134 pr_debug("phantom: SRS %u regs %x\n", rs.count, rs.mask);
135 spin_lock_irqsave(&dev->regs_lock, flags);
136 if (dev->status & PHB_NOT_OH)
137 memcpy(&dev->oregs, &rs, sizeof(rs));
138 else {
139 u32 m = min(rs.count, 8U);
140 for (i = 0; i < m; i++)
141 if (rs.mask & BIT(i))
142 iowrite32(rs.values[i], dev->oaddr + i);
143 ioread32(dev->iaddr);
144 }
145 spin_unlock_irqrestore(&dev->regs_lock, flags);
146 break;
147 case PHN_GETREG:
148 case PHN_GET_REG:
149 if (copy_from_user(&r, argp, sizeof(r)))
150 return -EFAULT;
151
152 if (r.reg > 7)
153 return -EINVAL;
154
155 r.value = ioread32(dev->iaddr + r.reg);
156
157 if (copy_to_user(argp, &r, sizeof(r)))
158 return -EFAULT;
159 break;
160 case PHN_GETREGS:
161 case PHN_GET_REGS: {
162 u32 m;
163
164 if (copy_from_user(&rs, argp, sizeof(rs)))
165 return -EFAULT;
166
167 m = min(rs.count, 8U);
168
169 pr_debug("phantom: GRS %u regs %x\n", rs.count, rs.mask);
170 spin_lock_irqsave(&dev->regs_lock, flags);
171 for (i = 0; i < m; i++)
172 if (rs.mask & BIT(i))
173 rs.values[i] = ioread32(dev->iaddr + i);
174 atomic_set(&dev->counter, 0);
175 spin_unlock_irqrestore(&dev->regs_lock, flags);
176
177 if (copy_to_user(argp, &rs, sizeof(rs)))
178 return -EFAULT;
179 break;
180 } case PHN_NOT_OH:
181 spin_lock_irqsave(&dev->regs_lock, flags);
182 if (dev->status & PHB_RUNNING) {
183 printk(KERN_ERR "phantom: you need to set NOT_OH "
184 "before you start the device!\n");
185 spin_unlock_irqrestore(&dev->regs_lock, flags);
186 return -EINVAL;
187 }
188 dev->status |= PHB_NOT_OH;
189 spin_unlock_irqrestore(&dev->regs_lock, flags);
190 break;
191 default:
192 return -ENOTTY;
193 }
194
195 return 0;
196}
197
198#ifdef CONFIG_COMPAT
199static long phantom_compat_ioctl(struct file *filp, unsigned int cmd,
200 unsigned long arg)
201{
202 if (_IOC_NR(cmd) <= 3 && _IOC_SIZE(cmd) == sizeof(compat_uptr_t)) {
203 cmd &= ~(_IOC_SIZEMASK << _IOC_SIZESHIFT);
204 cmd |= sizeof(void *) << _IOC_SIZESHIFT;
205 }
206 return phantom_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
207}
208#else
209#define phantom_compat_ioctl NULL
210#endif
211
212static int phantom_open(struct inode *inode, struct file *file)
213{
214 struct phantom_device *dev = container_of(inode->i_cdev,
215 struct phantom_device, cdev);
216
217 lock_kernel();
218 nonseekable_open(inode, file);
219
220 if (mutex_lock_interruptible(&dev->open_lock)) {
221 unlock_kernel();
222 return -ERESTARTSYS;
223 }
224
225 if (dev->opened) {
226 mutex_unlock(&dev->open_lock);
227 unlock_kernel();
228 return -EINVAL;
229 }
230
231 WARN_ON(dev->status & PHB_NOT_OH);
232
233 file->private_data = dev;
234
235 atomic_set(&dev->counter, 0);
236 dev->opened++;
237 mutex_unlock(&dev->open_lock);
238 unlock_kernel();
239 return 0;
240}
241
242static int phantom_release(struct inode *inode, struct file *file)
243{
244 struct phantom_device *dev = file->private_data;
245
246 mutex_lock(&dev->open_lock);
247
248 dev->opened = 0;
249 phantom_status(dev, dev->status & ~PHB_RUNNING);
250 dev->status &= ~PHB_NOT_OH;
251
252 mutex_unlock(&dev->open_lock);
253
254 return 0;
255}
256
257static unsigned int phantom_poll(struct file *file, poll_table *wait)
258{
259 struct phantom_device *dev = file->private_data;
260 unsigned int mask = 0;
261
262 pr_debug("phantom_poll: %d\n", atomic_read(&dev->counter));
263 poll_wait(file, &dev->wait, wait);
264
265 if (!(dev->status & PHB_RUNNING))
266 mask = POLLERR;
267 else if (atomic_read(&dev->counter))
268 mask = POLLIN | POLLRDNORM;
269
270 pr_debug("phantom_poll end: %x/%d\n", mask, atomic_read(&dev->counter));
271
272 return mask;
273}
274
275static const struct file_operations phantom_file_ops = {
276 .open = phantom_open,
277 .release = phantom_release,
278 .unlocked_ioctl = phantom_ioctl,
279 .compat_ioctl = phantom_compat_ioctl,
280 .poll = phantom_poll,
281};
282
283static irqreturn_t phantom_isr(int irq, void *data)
284{
285 struct phantom_device *dev = data;
286 unsigned int i;
287 u32 ctl;
288
289 spin_lock(&dev->regs_lock);
290 ctl = ioread32(dev->iaddr + PHN_CONTROL);
291 if (!(ctl & PHN_CTL_IRQ)) {
292 spin_unlock(&dev->regs_lock);
293 return IRQ_NONE;
294 }
295
296 iowrite32(0, dev->iaddr);
297 iowrite32(0xc0, dev->iaddr);
298
299 if (dev->status & PHB_NOT_OH) {
300 struct phm_regs *r = &dev->oregs;
301 u32 m = min(r->count, 8U);
302
303 for (i = 0; i < m; i++)
304 if (r->mask & BIT(i))
305 iowrite32(r->values[i], dev->oaddr + i);
306
307 dev->ctl_reg ^= PHN_CTL_AMP;
308 iowrite32(dev->ctl_reg, dev->iaddr + PHN_CONTROL);
309 }
310 spin_unlock(&dev->regs_lock);
311
312 ioread32(dev->iaddr);
313
314 atomic_inc(&dev->counter);
315 wake_up_interruptible(&dev->wait);
316
317 return IRQ_HANDLED;
318}
319
320
321
322
323
324static unsigned int __devinit phantom_get_free(void)
325{
326 unsigned int i;
327
328 for (i = 0; i < PHANTOM_MAX_MINORS; i++)
329 if (phantom_devices[i] == 0)
330 break;
331
332 return i;
333}
334
335static int __devinit phantom_probe(struct pci_dev *pdev,
336 const struct pci_device_id *pci_id)
337{
338 struct phantom_device *pht;
339 unsigned int minor;
340 int retval;
341
342 retval = pci_enable_device(pdev);
343 if (retval)
344 goto err;
345
346 minor = phantom_get_free();
347 if (minor == PHANTOM_MAX_MINORS) {
348 dev_err(&pdev->dev, "too many devices found!\n");
349 retval = -EIO;
350 goto err_dis;
351 }
352
353 phantom_devices[minor] = 1;
354
355 retval = pci_request_regions(pdev, "phantom");
356 if (retval)
357 goto err_null;
358
359 retval = -ENOMEM;
360 pht = kzalloc(sizeof(*pht), GFP_KERNEL);
361 if (pht == NULL) {
362 dev_err(&pdev->dev, "unable to allocate device\n");
363 goto err_reg;
364 }
365
366 pht->caddr = pci_iomap(pdev, 0, 0);
367 if (pht->caddr == NULL) {
368 dev_err(&pdev->dev, "can't remap conf space\n");
369 goto err_fr;
370 }
371 pht->iaddr = pci_iomap(pdev, 2, 0);
372 if (pht->iaddr == NULL) {
373 dev_err(&pdev->dev, "can't remap input space\n");
374 goto err_unmc;
375 }
376 pht->oaddr = pci_iomap(pdev, 3, 0);
377 if (pht->oaddr == NULL) {
378 dev_err(&pdev->dev, "can't remap output space\n");
379 goto err_unmi;
380 }
381
382 mutex_init(&pht->open_lock);
383 spin_lock_init(&pht->regs_lock);
384 init_waitqueue_head(&pht->wait);
385 cdev_init(&pht->cdev, &phantom_file_ops);
386 pht->cdev.owner = THIS_MODULE;
387
388 iowrite32(0, pht->caddr + PHN_IRQCTL);
389 ioread32(pht->caddr + PHN_IRQCTL);
390 retval = request_irq(pdev->irq, phantom_isr,
391 IRQF_SHARED | IRQF_DISABLED, "phantom", pht);
392 if (retval) {
393 dev_err(&pdev->dev, "can't establish ISR\n");
394 goto err_unmo;
395 }
396
397 retval = cdev_add(&pht->cdev, MKDEV(phantom_major, minor), 1);
398 if (retval) {
399 dev_err(&pdev->dev, "chardev registration failed\n");
400 goto err_irq;
401 }
402
403 if (IS_ERR(device_create(phantom_class, &pdev->dev,
404 MKDEV(phantom_major, minor), NULL,
405 "phantom%u", minor)))
406 dev_err(&pdev->dev, "can't create device\n");
407
408 pci_set_drvdata(pdev, pht);
409
410 return 0;
411err_irq:
412 free_irq(pdev->irq, pht);
413err_unmo:
414 pci_iounmap(pdev, pht->oaddr);
415err_unmi:
416 pci_iounmap(pdev, pht->iaddr);
417err_unmc:
418 pci_iounmap(pdev, pht->caddr);
419err_fr:
420 kfree(pht);
421err_reg:
422 pci_release_regions(pdev);
423err_null:
424 phantom_devices[minor] = 0;
425err_dis:
426 pci_disable_device(pdev);
427err:
428 return retval;
429}
430
431static void __devexit phantom_remove(struct pci_dev *pdev)
432{
433 struct phantom_device *pht = pci_get_drvdata(pdev);
434 unsigned int minor = MINOR(pht->cdev.dev);
435
436 device_destroy(phantom_class, MKDEV(phantom_major, minor));
437
438 cdev_del(&pht->cdev);
439
440 iowrite32(0, pht->caddr + PHN_IRQCTL);
441 ioread32(pht->caddr + PHN_IRQCTL);
442 free_irq(pdev->irq, pht);
443
444 pci_iounmap(pdev, pht->oaddr);
445 pci_iounmap(pdev, pht->iaddr);
446 pci_iounmap(pdev, pht->caddr);
447
448 kfree(pht);
449
450 pci_release_regions(pdev);
451
452 phantom_devices[minor] = 0;
453
454 pci_disable_device(pdev);
455}
456
457#ifdef CONFIG_PM
458static int phantom_suspend(struct pci_dev *pdev, pm_message_t state)
459{
460 struct phantom_device *dev = pci_get_drvdata(pdev);
461
462 iowrite32(0, dev->caddr + PHN_IRQCTL);
463 ioread32(dev->caddr + PHN_IRQCTL);
464
465 synchronize_irq(pdev->irq);
466
467 return 0;
468}
469
470static int phantom_resume(struct pci_dev *pdev)
471{
472 struct phantom_device *dev = pci_get_drvdata(pdev);
473
474 iowrite32(0, dev->caddr + PHN_IRQCTL);
475
476 return 0;
477}
478#else
479#define phantom_suspend NULL
480#define phantom_resume NULL
481#endif
482
483static struct pci_device_id phantom_pci_tbl[] __devinitdata = {
484 { .vendor = PCI_VENDOR_ID_PLX, .device = PCI_DEVICE_ID_PLX_9050,
485 .subvendor = PCI_VENDOR_ID_PLX, .subdevice = PCI_DEVICE_ID_PLX_9050,
486 .class = PCI_CLASS_BRIDGE_OTHER << 8, .class_mask = 0xffff00 },
487 { 0, }
488};
489MODULE_DEVICE_TABLE(pci, phantom_pci_tbl);
490
491static struct pci_driver phantom_pci_driver = {
492 .name = "phantom",
493 .id_table = phantom_pci_tbl,
494 .probe = phantom_probe,
495 .remove = __devexit_p(phantom_remove),
496 .suspend = phantom_suspend,
497 .resume = phantom_resume
498};
499
500static ssize_t phantom_show_version(struct class *cls, char *buf)
501{
502 return sprintf(buf, PHANTOM_VERSION "\n");
503}
504
505static CLASS_ATTR(version, 0444, phantom_show_version, NULL);
506
507static int __init phantom_init(void)
508{
509 int retval;
510 dev_t dev;
511
512 phantom_class = class_create(THIS_MODULE, "phantom");
513 if (IS_ERR(phantom_class)) {
514 retval = PTR_ERR(phantom_class);
515 printk(KERN_ERR "phantom: can't register phantom class\n");
516 goto err;
517 }
518 retval = class_create_file(phantom_class, &class_attr_version);
519 if (retval) {
520 printk(KERN_ERR "phantom: can't create sysfs version file\n");
521 goto err_class;
522 }
523
524 retval = alloc_chrdev_region(&dev, 0, PHANTOM_MAX_MINORS, "phantom");
525 if (retval) {
526 printk(KERN_ERR "phantom: can't register character device\n");
527 goto err_attr;
528 }
529 phantom_major = MAJOR(dev);
530
531 retval = pci_register_driver(&phantom_pci_driver);
532 if (retval) {
533 printk(KERN_ERR "phantom: can't register pci driver\n");
534 goto err_unchr;
535 }
536
537 printk(KERN_INFO "Phantom Linux Driver, version " PHANTOM_VERSION ", "
538 "init OK\n");
539
540 return 0;
541err_unchr:
542 unregister_chrdev_region(dev, PHANTOM_MAX_MINORS);
543err_attr:
544 class_remove_file(phantom_class, &class_attr_version);
545err_class:
546 class_destroy(phantom_class);
547err:
548 return retval;
549}
550
551static void __exit phantom_exit(void)
552{
553 pci_unregister_driver(&phantom_pci_driver);
554
555 unregister_chrdev_region(MKDEV(phantom_major, 0), PHANTOM_MAX_MINORS);
556
557 class_remove_file(phantom_class, &class_attr_version);
558 class_destroy(phantom_class);
559
560 pr_debug("phantom: module successfully removed\n");
561}
562
563module_init(phantom_init);
564module_exit(phantom_exit);
565
566MODULE_AUTHOR("Jiri Slaby <jirislaby@gmail.com>");
567MODULE_DESCRIPTION("Sensable Phantom driver (PCI devices)");
568MODULE_LICENSE("GPL");
569MODULE_VERSION(PHANTOM_VERSION);
570
