Add dummy_signal_irq function to save check in ISR
[linux-2.6.git] / drivers / misc / tifm_7xx1.c
1 /*
2  *  tifm_7xx1.c - TI FlashMedia driver
3  *
4  *  Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  */
11
12 #include <linux/tifm.h>
13 #include <linux/dma-mapping.h>
14
15 #define DRIVER_NAME "tifm_7xx1"
16 #define DRIVER_VERSION "0.7"
17
18 static void tifm_7xx1_eject(struct tifm_adapter *fm, struct tifm_dev *sock)
19 {
20         int cnt;
21         unsigned long flags;
22
23         spin_lock_irqsave(&fm->lock, flags);
24         if (!fm->inhibit_new_cards) {
25                 for (cnt = 0; cnt < fm->max_sockets; cnt++) {
26                         if (fm->sockets[cnt] == sock) {
27                                 fm->remove_mask |= (1 << cnt);
28                                 queue_work(fm->wq, &fm->media_remover);
29                                 break;
30                         }
31                 }
32         }
33         spin_unlock_irqrestore(&fm->lock, flags);
34 }
35
36 static void tifm_7xx1_remove_media(struct work_struct *work)
37 {
38         struct tifm_adapter *fm =
39                 container_of(work, struct tifm_adapter, media_remover);
40         unsigned long flags;
41         int cnt;
42         struct tifm_dev *sock;
43
44         if (!class_device_get(&fm->cdev))
45                 return;
46         spin_lock_irqsave(&fm->lock, flags);
47         for (cnt = 0; cnt < fm->max_sockets; cnt++) {
48                 if (fm->sockets[cnt] && (fm->remove_mask & (1 << cnt))) {
49                         printk(KERN_INFO DRIVER_NAME
50                                ": demand removing card from socket %d\n", cnt);
51                         sock = fm->sockets[cnt];
52                         fm->sockets[cnt] = NULL;
53                         fm->remove_mask &= ~(1 << cnt);
54
55                         writel(0x0e00, sock->addr + SOCK_CONTROL);
56
57                         writel((TIFM_IRQ_FIFOMASK | TIFM_IRQ_CARDMASK) << cnt,
58                                 fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
59                         writel((TIFM_IRQ_FIFOMASK | TIFM_IRQ_CARDMASK) << cnt,
60                                 fm->addr + FM_SET_INTERRUPT_ENABLE);
61
62                         spin_unlock_irqrestore(&fm->lock, flags);
63                         device_unregister(&sock->dev);
64                         spin_lock_irqsave(&fm->lock, flags);
65                 }
66         }
67         spin_unlock_irqrestore(&fm->lock, flags);
68         class_device_put(&fm->cdev);
69 }
70
71 static irqreturn_t tifm_7xx1_isr(int irq, void *dev_id)
72 {
73         struct tifm_adapter *fm = dev_id;
74         struct tifm_dev *sock;
75         unsigned int irq_status;
76         unsigned int sock_irq_status, cnt;
77
78         spin_lock(&fm->lock);
79         irq_status = readl(fm->addr + FM_INTERRUPT_STATUS);
80         if (irq_status == 0 || irq_status == (~0)) {
81                 spin_unlock(&fm->lock);
82                 return IRQ_NONE;
83         }
84
85         if (irq_status & TIFM_IRQ_ENABLE) {
86                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
87
88                 for (cnt = 0; cnt <  fm->max_sockets; cnt++) {
89                         sock = fm->sockets[cnt];
90                         sock_irq_status = (irq_status >> cnt) &
91                                         (TIFM_IRQ_FIFOMASK | TIFM_IRQ_CARDMASK);
92
93                         if (sock) {
94                                 if (sock_irq_status)
95                                         sock->signal_irq(sock, sock_irq_status);
96
97                                 if (irq_status & (1 << cnt))
98                                         fm->remove_mask |= 1 << cnt;
99                         } else {
100                                 if (irq_status & (1 << cnt))
101                                         fm->insert_mask |= 1 << cnt;
102                         }
103                 }
104         }
105         writel(irq_status, fm->addr + FM_INTERRUPT_STATUS);
106
107         if (!fm->inhibit_new_cards) {
108                 if (!fm->remove_mask && !fm->insert_mask) {
109                         writel(TIFM_IRQ_ENABLE,
110                                 fm->addr + FM_SET_INTERRUPT_ENABLE);
111                 } else {
112                         queue_work(fm->wq, &fm->media_remover);
113                         queue_work(fm->wq, &fm->media_inserter);
114                 }
115         }
116
117         spin_unlock(&fm->lock);
118         return IRQ_HANDLED;
119 }
120
121 static tifm_media_id tifm_7xx1_toggle_sock_power(char __iomem *sock_addr, int is_x2)
122 {
123         unsigned int s_state;
124         int cnt;
125
126         writel(0x0e00, sock_addr + SOCK_CONTROL);
127
128         for (cnt = 0; cnt < 100; cnt++) {
129                 if (!(TIFM_SOCK_STATE_POWERED &
130                                 readl(sock_addr + SOCK_PRESENT_STATE)))
131                         break;
132                 msleep(10);
133         }
134
135         s_state = readl(sock_addr + SOCK_PRESENT_STATE);
136         if (!(TIFM_SOCK_STATE_OCCUPIED & s_state))
137                 return FM_NULL;
138
139         if (is_x2) {
140                 writel((s_state & 7) | 0x0c00, sock_addr + SOCK_CONTROL);
141         } else {
142                 // SmartMedia cards need extra 40 msec
143                 if (((readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7) == 1)
144                         msleep(40);
145                 writel(readl(sock_addr + SOCK_CONTROL) | TIFM_CTRL_LED,
146                        sock_addr + SOCK_CONTROL);
147                 msleep(10);
148                 writel((s_state & 0x7) | 0x0c00 | TIFM_CTRL_LED,
149                         sock_addr + SOCK_CONTROL);
150         }
151
152         for (cnt = 0; cnt < 100; cnt++) {
153                 if ((TIFM_SOCK_STATE_POWERED &
154                                 readl(sock_addr + SOCK_PRESENT_STATE)))
155                         break;
156                 msleep(10);
157         }
158
159         if (!is_x2)
160                 writel(readl(sock_addr + SOCK_CONTROL) & (~TIFM_CTRL_LED),
161                        sock_addr + SOCK_CONTROL);
162
163         return (readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7;
164 }
165
166 inline static char __iomem *
167 tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
168 {
169         return base_addr + ((sock_num + 1) << 10);
170 }
171
172 static void tifm_7xx1_insert_media(struct work_struct *work)
173 {
174         struct tifm_adapter *fm =
175                 container_of(work, struct tifm_adapter, media_inserter);
176         unsigned long flags;
177         tifm_media_id media_id;
178         char *card_name = "xx";
179         int cnt, ok_to_register;
180         unsigned int insert_mask;
181         struct tifm_dev *new_sock = NULL;
182
183         if (!class_device_get(&fm->cdev))
184                 return;
185         spin_lock_irqsave(&fm->lock, flags);
186         insert_mask = fm->insert_mask;
187         fm->insert_mask = 0;
188         if (fm->inhibit_new_cards) {
189                 spin_unlock_irqrestore(&fm->lock, flags);
190                 class_device_put(&fm->cdev);
191                 return;
192         }
193         spin_unlock_irqrestore(&fm->lock, flags);
194
195         for (cnt = 0; cnt < fm->max_sockets; cnt++) {
196                 if (!(insert_mask & (1 << cnt)))
197                         continue;
198
199                 media_id = tifm_7xx1_toggle_sock_power(tifm_7xx1_sock_addr(fm->addr, cnt),
200                                                        fm->max_sockets == 2);
201                 if (media_id) {
202                         ok_to_register = 0;
203                         new_sock = tifm_alloc_device(fm);
204                         if (new_sock) {
205                                 new_sock->addr = tifm_7xx1_sock_addr(fm->addr,
206                                                                         cnt);
207                                 new_sock->media_id = media_id;
208                                 new_sock->socket_id = cnt;
209                                 switch (media_id) {
210                                 case 1:
211                                         card_name = "xd";
212                                         break;
213                                 case 2:
214                                         card_name = "ms";
215                                         break;
216                                 case 3:
217                                         card_name = "sd";
218                                         break;
219                                 default:
220                                         break;
221                                 }
222                                 snprintf(new_sock->dev.bus_id, BUS_ID_SIZE,
223                                         "tifm_%s%u:%u", card_name, fm->id, cnt);
224                                 printk(KERN_INFO DRIVER_NAME
225                                         ": %s card detected in socket %d\n",
226                                         card_name, cnt);
227                                 spin_lock_irqsave(&fm->lock, flags);
228                                 if (!fm->sockets[cnt]) {
229                                         fm->sockets[cnt] = new_sock;
230                                         ok_to_register = 1;
231                                 }
232                                 spin_unlock_irqrestore(&fm->lock, flags);
233                                 if (!ok_to_register ||
234                                             device_register(&new_sock->dev)) {
235                                         spin_lock_irqsave(&fm->lock, flags);
236                                         fm->sockets[cnt] = NULL;
237                                         spin_unlock_irqrestore(&fm->lock,
238                                                                 flags);
239                                         tifm_free_device(&new_sock->dev);
240                                 }
241                         }
242                 }
243                 writel((TIFM_IRQ_FIFOMASK | TIFM_IRQ_CARDMASK) << cnt,
244                        fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
245                 writel((TIFM_IRQ_FIFOMASK | TIFM_IRQ_CARDMASK) << cnt,
246                        fm->addr + FM_SET_INTERRUPT_ENABLE);
247         }
248
249         writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
250         class_device_put(&fm->cdev);
251 }
252
253 static int tifm_7xx1_suspend(struct pci_dev *dev, pm_message_t state)
254 {
255         struct tifm_adapter *fm = pci_get_drvdata(dev);
256         unsigned long flags;
257
258         spin_lock_irqsave(&fm->lock, flags);
259         fm->inhibit_new_cards = 1;
260         fm->remove_mask = 0xf;
261         fm->insert_mask = 0;
262         writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
263         spin_unlock_irqrestore(&fm->lock, flags);
264         flush_workqueue(fm->wq);
265
266         tifm_7xx1_remove_media(&fm->media_remover);
267
268         pci_set_power_state(dev, PCI_D3hot);
269         pci_disable_device(dev);
270         pci_save_state(dev);
271         return 0;
272 }
273
274 static int tifm_7xx1_resume(struct pci_dev *dev)
275 {
276         struct tifm_adapter *fm = pci_get_drvdata(dev);
277         unsigned long flags;
278
279         pci_restore_state(dev);
280         pci_enable_device(dev);
281         pci_set_power_state(dev, PCI_D0);
282         pci_set_master(dev);
283
284         spin_lock_irqsave(&fm->lock, flags);
285         fm->inhibit_new_cards = 0;
286         writel(TIFM_IRQ_SETALL, fm->addr + FM_INTERRUPT_STATUS);
287         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
288         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SETALLSOCK,
289                 fm->addr + FM_SET_INTERRUPT_ENABLE);
290         fm->insert_mask = 0xf;
291         spin_unlock_irqrestore(&fm->lock, flags);
292         return 0;
293 }
294
295 static int tifm_7xx1_probe(struct pci_dev *dev,
296                         const struct pci_device_id *dev_id)
297 {
298         struct tifm_adapter *fm;
299         int pci_dev_busy = 0;
300         int rc;
301
302         rc = pci_set_dma_mask(dev, DMA_32BIT_MASK);
303         if (rc)
304                 return rc;
305
306         rc = pci_enable_device(dev);
307         if (rc)
308                 return rc;
309
310         pci_set_master(dev);
311
312         rc = pci_request_regions(dev, DRIVER_NAME);
313         if (rc) {
314                 pci_dev_busy = 1;
315                 goto err_out;
316         }
317
318         pci_intx(dev, 1);
319
320         fm = tifm_alloc_adapter();
321         if (!fm) {
322                 rc = -ENOMEM;
323                 goto err_out_int;
324         }
325
326         fm->dev = &dev->dev;
327         fm->max_sockets = (dev->device == 0x803B) ? 2 : 4;
328         fm->sockets = kzalloc(sizeof(struct tifm_dev*) * fm->max_sockets,
329                                 GFP_KERNEL);
330         if (!fm->sockets)
331                 goto err_out_free;
332
333         INIT_WORK(&fm->media_inserter, tifm_7xx1_insert_media);
334         INIT_WORK(&fm->media_remover, tifm_7xx1_remove_media);
335         fm->eject = tifm_7xx1_eject;
336         pci_set_drvdata(dev, fm);
337
338         fm->addr = ioremap(pci_resource_start(dev, 0),
339                                 pci_resource_len(dev, 0));
340         if (!fm->addr)
341                 goto err_out_free;
342
343         rc = request_irq(dev->irq, tifm_7xx1_isr, SA_SHIRQ, DRIVER_NAME, fm);
344         if (rc)
345                 goto err_out_unmap;
346
347         rc = tifm_add_adapter(fm);
348         if (rc)
349                 goto err_out_irq;
350
351         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
352         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SETALLSOCK,
353                 fm->addr + FM_SET_INTERRUPT_ENABLE);
354
355         fm->insert_mask = 0xf;
356
357         return 0;
358
359 err_out_irq:
360         free_irq(dev->irq, fm);
361 err_out_unmap:
362         iounmap(fm->addr);
363 err_out_free:
364         pci_set_drvdata(dev, NULL);
365         tifm_free_adapter(fm);
366 err_out_int:
367         pci_intx(dev, 0);
368         pci_release_regions(dev);
369 err_out:
370         if (!pci_dev_busy)
371                 pci_disable_device(dev);
372         return rc;
373 }
374
375 static void tifm_7xx1_remove(struct pci_dev *dev)
376 {
377         struct tifm_adapter *fm = pci_get_drvdata(dev);
378         unsigned long flags;
379
380         spin_lock_irqsave(&fm->lock, flags);
381         fm->inhibit_new_cards = 1;
382         fm->remove_mask = 0xf;
383         fm->insert_mask = 0;
384         writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
385         spin_unlock_irqrestore(&fm->lock, flags);
386
387         flush_workqueue(fm->wq);
388
389         tifm_7xx1_remove_media(&fm->media_remover);
390
391         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
392         free_irq(dev->irq, fm);
393
394         tifm_remove_adapter(fm);
395
396         pci_set_drvdata(dev, NULL);
397
398         iounmap(fm->addr);
399         pci_intx(dev, 0);
400         pci_release_regions(dev);
401
402         pci_disable_device(dev);
403         tifm_free_adapter(fm);
404 }
405
406 static struct pci_device_id tifm_7xx1_pci_tbl [] = {
407         { PCI_VENDOR_ID_TI, 0x8033, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
408           0 }, /* xx21 - the one I have */
409         { PCI_VENDOR_ID_TI, 0x803B, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
410           0 }, /* xx12 - should be also supported */
411         { }
412 };
413
414 static struct pci_driver tifm_7xx1_driver = {
415         .name = DRIVER_NAME,
416         .id_table = tifm_7xx1_pci_tbl,
417         .probe = tifm_7xx1_probe,
418         .remove = tifm_7xx1_remove,
419         .suspend = tifm_7xx1_suspend,
420         .resume = tifm_7xx1_resume,
421 };
422
423 static int __init tifm_7xx1_init(void)
424 {
425         return pci_register_driver(&tifm_7xx1_driver);
426 }
427
428 static void __exit tifm_7xx1_exit(void)
429 {
430         pci_unregister_driver(&tifm_7xx1_driver);
431 }
432
433 MODULE_AUTHOR("Alex Dubov");
434 MODULE_DESCRIPTION("TI FlashMedia host driver");
435 MODULE_LICENSE("GPL");
436 MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
437 MODULE_VERSION(DRIVER_VERSION);
438
439 module_init(tifm_7xx1_init);
440 module_exit(tifm_7xx1_exit);