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