misc: therm_est: Robustify history management
[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 #include <linux/module.h>
15
16 #define DRIVER_NAME "tifm_7xx1"
17 #define DRIVER_VERSION "0.8"
18
19 #define TIFM_IRQ_ENABLE           0x80000000
20 #define TIFM_IRQ_SOCKMASK(x)      (x)
21 #define TIFM_IRQ_CARDMASK(x)      ((x) << 8)
22 #define TIFM_IRQ_FIFOMASK(x)      ((x) << 16)
23 #define TIFM_IRQ_SETALL           0xffffffff
24
25 static void tifm_7xx1_dummy_eject(struct tifm_adapter *fm,
26                                   struct tifm_dev *sock)
27 {
28 }
29
30 static void tifm_7xx1_eject(struct tifm_adapter *fm, struct tifm_dev *sock)
31 {
32         unsigned long flags;
33
34         spin_lock_irqsave(&fm->lock, flags);
35         fm->socket_change_set |= 1 << sock->socket_id;
36         tifm_queue_work(&fm->media_switcher);
37         spin_unlock_irqrestore(&fm->lock, flags);
38 }
39
40 static irqreturn_t tifm_7xx1_isr(int irq, void *dev_id)
41 {
42         struct tifm_adapter *fm = dev_id;
43         struct tifm_dev *sock;
44         unsigned int irq_status, cnt;
45
46         spin_lock(&fm->lock);
47         irq_status = readl(fm->addr + FM_INTERRUPT_STATUS);
48         if (irq_status == 0 || irq_status == (~0)) {
49                 spin_unlock(&fm->lock);
50                 return IRQ_NONE;
51         }
52
53         if (irq_status & TIFM_IRQ_ENABLE) {
54                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
55
56                 for (cnt = 0; cnt < fm->num_sockets; cnt++) {
57                         sock = fm->sockets[cnt];
58                         if (sock) {
59                                 if ((irq_status >> cnt) & TIFM_IRQ_FIFOMASK(1))
60                                         sock->data_event(sock);
61                                 if ((irq_status >> cnt) & TIFM_IRQ_CARDMASK(1))
62                                         sock->card_event(sock);
63                         }
64                 }
65
66                 fm->socket_change_set |= irq_status
67                                          & ((1 << fm->num_sockets) - 1);
68         }
69         writel(irq_status, fm->addr + FM_INTERRUPT_STATUS);
70
71         if (fm->finish_me)
72                 complete_all(fm->finish_me);
73         else if (!fm->socket_change_set)
74                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
75         else
76                 tifm_queue_work(&fm->media_switcher);
77
78         spin_unlock(&fm->lock);
79         return IRQ_HANDLED;
80 }
81
82 static unsigned char tifm_7xx1_toggle_sock_power(char __iomem *sock_addr)
83 {
84         unsigned int s_state;
85         int cnt;
86
87         writel(0x0e00, sock_addr + SOCK_CONTROL);
88
89         for (cnt = 16; cnt <= 256; cnt <<= 1) {
90                 if (!(TIFM_SOCK_STATE_POWERED
91                       & readl(sock_addr + SOCK_PRESENT_STATE)))
92                         break;
93
94                 msleep(cnt);
95         }
96
97         s_state = readl(sock_addr + SOCK_PRESENT_STATE);
98         if (!(TIFM_SOCK_STATE_OCCUPIED & s_state))
99                 return 0;
100
101         writel(readl(sock_addr + SOCK_CONTROL) | TIFM_CTRL_LED,
102                sock_addr + SOCK_CONTROL);
103
104         /* xd needs some extra time before power on */
105         if (((readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7)
106             == TIFM_TYPE_XD)
107                 msleep(40);
108
109         writel((s_state & TIFM_CTRL_POWER_MASK) | 0x0c00,
110                sock_addr + SOCK_CONTROL);
111         /* wait for power to stabilize */
112         msleep(20);
113         for (cnt = 16; cnt <= 256; cnt <<= 1) {
114                 if ((TIFM_SOCK_STATE_POWERED
115                      & readl(sock_addr + SOCK_PRESENT_STATE)))
116                         break;
117
118                 msleep(cnt);
119         }
120
121         writel(readl(sock_addr + SOCK_CONTROL) & (~TIFM_CTRL_LED),
122                sock_addr + SOCK_CONTROL);
123
124         return (readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7;
125 }
126
127 inline static void tifm_7xx1_sock_power_off(char __iomem *sock_addr)
128 {
129         writel((~TIFM_CTRL_POWER_MASK) & readl(sock_addr + SOCK_CONTROL),
130                sock_addr + SOCK_CONTROL);
131 }
132
133 inline static char __iomem *
134 tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
135 {
136         return base_addr + ((sock_num + 1) << 10);
137 }
138
139 static void tifm_7xx1_switch_media(struct work_struct *work)
140 {
141         struct tifm_adapter *fm = container_of(work, struct tifm_adapter,
142                                                media_switcher);
143         struct tifm_dev *sock;
144         char __iomem *sock_addr;
145         unsigned long flags;
146         unsigned char media_id;
147         unsigned int socket_change_set, cnt;
148
149         spin_lock_irqsave(&fm->lock, flags);
150         socket_change_set = fm->socket_change_set;
151         fm->socket_change_set = 0;
152
153         dev_dbg(fm->dev.parent, "checking media set %x\n",
154                 socket_change_set);
155
156         if (!socket_change_set) {
157                 spin_unlock_irqrestore(&fm->lock, flags);
158                 return;
159         }
160
161         for (cnt = 0; cnt < fm->num_sockets; cnt++) {
162                 if (!(socket_change_set & (1 << cnt)))
163                         continue;
164                 sock = fm->sockets[cnt];
165                 if (sock) {
166                         printk(KERN_INFO
167                                "%s : demand removing card from socket %u:%u\n",
168                                dev_name(&fm->dev), fm->id, cnt);
169                         fm->sockets[cnt] = NULL;
170                         sock_addr = sock->addr;
171                         spin_unlock_irqrestore(&fm->lock, flags);
172                         device_unregister(&sock->dev);
173                         spin_lock_irqsave(&fm->lock, flags);
174                         tifm_7xx1_sock_power_off(sock_addr);
175                         writel(0x0e00, sock_addr + SOCK_CONTROL);
176                 }
177
178                 spin_unlock_irqrestore(&fm->lock, flags);
179
180                 media_id = tifm_7xx1_toggle_sock_power(
181                                 tifm_7xx1_sock_addr(fm->addr, cnt));
182
183                 // tifm_alloc_device will check if media_id is valid
184                 sock = tifm_alloc_device(fm, cnt, media_id);
185                 if (sock) {
186                         sock->addr = tifm_7xx1_sock_addr(fm->addr, cnt);
187
188                         if (!device_register(&sock->dev)) {
189                                 spin_lock_irqsave(&fm->lock, flags);
190                                 if (!fm->sockets[cnt]) {
191                                         fm->sockets[cnt] = sock;
192                                         sock = NULL;
193                                 }
194                                 spin_unlock_irqrestore(&fm->lock, flags);
195                         }
196                         if (sock)
197                                 tifm_free_device(&sock->dev);
198                 }
199                 spin_lock_irqsave(&fm->lock, flags);
200         }
201
202         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
203                | TIFM_IRQ_CARDMASK(socket_change_set),
204                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
205
206         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
207                | TIFM_IRQ_CARDMASK(socket_change_set),
208                fm->addr + FM_SET_INTERRUPT_ENABLE);
209
210         writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
211         spin_unlock_irqrestore(&fm->lock, flags);
212 }
213
214 #ifdef CONFIG_PM
215
216 static int tifm_7xx1_suspend(struct pci_dev *dev, pm_message_t state)
217 {
218         struct tifm_adapter *fm = pci_get_drvdata(dev);
219         int cnt;
220
221         dev_dbg(&dev->dev, "suspending host\n");
222
223         for (cnt = 0; cnt < fm->num_sockets; cnt++) {
224                 if (fm->sockets[cnt])
225                         tifm_7xx1_sock_power_off(fm->sockets[cnt]->addr);
226         }
227
228         pci_save_state(dev);
229         pci_enable_wake(dev, pci_choose_state(dev, state), 0);
230         pci_disable_device(dev);
231         pci_set_power_state(dev, pci_choose_state(dev, state));
232         return 0;
233 }
234
235 static int tifm_7xx1_resume(struct pci_dev *dev)
236 {
237         struct tifm_adapter *fm = pci_get_drvdata(dev);
238         int rc;
239         unsigned int good_sockets = 0, bad_sockets = 0;
240         unsigned long flags;
241         unsigned char new_ids[fm->num_sockets];
242         DECLARE_COMPLETION_ONSTACK(finish_resume);
243
244         pci_set_power_state(dev, PCI_D0);
245         pci_restore_state(dev);
246         rc = pci_enable_device(dev);
247         if (rc)
248                 return rc;
249         pci_set_master(dev);
250
251         dev_dbg(&dev->dev, "resuming host\n");
252
253         for (rc = 0; rc < fm->num_sockets; rc++)
254                 new_ids[rc] = tifm_7xx1_toggle_sock_power(
255                                         tifm_7xx1_sock_addr(fm->addr, rc));
256         spin_lock_irqsave(&fm->lock, flags);
257         for (rc = 0; rc < fm->num_sockets; rc++) {
258                 if (fm->sockets[rc]) {
259                         if (fm->sockets[rc]->type == new_ids[rc])
260                                 good_sockets |= 1 << rc;
261                         else
262                                 bad_sockets |= 1 << rc;
263                 }
264         }
265
266         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
267                fm->addr + FM_SET_INTERRUPT_ENABLE);
268         dev_dbg(&dev->dev, "change sets on resume: good %x, bad %x\n",
269                 good_sockets, bad_sockets);
270
271         fm->socket_change_set = 0;
272         if (good_sockets) {
273                 fm->finish_me = &finish_resume;
274                 spin_unlock_irqrestore(&fm->lock, flags);
275                 rc = wait_for_completion_timeout(&finish_resume, HZ);
276                 dev_dbg(&dev->dev, "wait returned %d\n", rc);
277                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
278                        | TIFM_IRQ_CARDMASK(good_sockets),
279                        fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
280                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
281                        | TIFM_IRQ_CARDMASK(good_sockets),
282                        fm->addr + FM_SET_INTERRUPT_ENABLE);
283                 spin_lock_irqsave(&fm->lock, flags);
284                 fm->finish_me = NULL;
285                 fm->socket_change_set ^= good_sockets & fm->socket_change_set;
286         }
287
288         fm->socket_change_set |= bad_sockets;
289         if (fm->socket_change_set)
290                 tifm_queue_work(&fm->media_switcher);
291
292         spin_unlock_irqrestore(&fm->lock, flags);
293         writel(TIFM_IRQ_ENABLE,
294                fm->addr + FM_SET_INTERRUPT_ENABLE);
295
296         return 0;
297 }
298
299 #else
300
301 #define tifm_7xx1_suspend NULL
302 #define tifm_7xx1_resume NULL
303
304 #endif /* CONFIG_PM */
305
306 static int tifm_7xx1_dummy_has_ms_pif(struct tifm_adapter *fm,
307                                       struct tifm_dev *sock)
308 {
309         return 0;
310 }
311
312 static int tifm_7xx1_has_ms_pif(struct tifm_adapter *fm, struct tifm_dev *sock)
313 {
314         if (((fm->num_sockets == 4) && (sock->socket_id == 2))
315             || ((fm->num_sockets == 2) && (sock->socket_id == 0)))
316                 return 1;
317
318         return 0;
319 }
320
321 static int tifm_7xx1_probe(struct pci_dev *dev,
322                            const struct pci_device_id *dev_id)
323 {
324         struct tifm_adapter *fm;
325         int pci_dev_busy = 0;
326         int rc;
327
328         rc = pci_set_dma_mask(dev, DMA_BIT_MASK(32));
329         if (rc)
330                 return rc;
331
332         rc = pci_enable_device(dev);
333         if (rc)
334                 return rc;
335
336         pci_set_master(dev);
337
338         rc = pci_request_regions(dev, DRIVER_NAME);
339         if (rc) {
340                 pci_dev_busy = 1;
341                 goto err_out;
342         }
343
344         pci_intx(dev, 1);
345
346         fm = tifm_alloc_adapter(dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM
347                                 ? 4 : 2, &dev->dev);
348         if (!fm) {
349                 rc = -ENOMEM;
350                 goto err_out_int;
351         }
352
353         INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);
354         fm->eject = tifm_7xx1_eject;
355         fm->has_ms_pif = tifm_7xx1_has_ms_pif;
356         pci_set_drvdata(dev, fm);
357
358         fm->addr = pci_ioremap_bar(dev, 0);
359         if (!fm->addr)
360                 goto err_out_free;
361
362         rc = request_irq(dev->irq, tifm_7xx1_isr, IRQF_SHARED, DRIVER_NAME, fm);
363         if (rc)
364                 goto err_out_unmap;
365
366         rc = tifm_add_adapter(fm);
367         if (rc)
368                 goto err_out_irq;
369
370         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
371                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
372         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
373                fm->addr + FM_SET_INTERRUPT_ENABLE);
374         return 0;
375
376 err_out_irq:
377         free_irq(dev->irq, fm);
378 err_out_unmap:
379         iounmap(fm->addr);
380 err_out_free:
381         pci_set_drvdata(dev, NULL);
382         tifm_free_adapter(fm);
383 err_out_int:
384         pci_intx(dev, 0);
385         pci_release_regions(dev);
386 err_out:
387         if (!pci_dev_busy)
388                 pci_disable_device(dev);
389         return rc;
390 }
391
392 static void tifm_7xx1_remove(struct pci_dev *dev)
393 {
394         struct tifm_adapter *fm = pci_get_drvdata(dev);
395         int cnt;
396
397         fm->eject = tifm_7xx1_dummy_eject;
398         fm->has_ms_pif = tifm_7xx1_dummy_has_ms_pif;
399         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
400         mmiowb();
401         free_irq(dev->irq, fm);
402
403         tifm_remove_adapter(fm);
404
405         for (cnt = 0; cnt < fm->num_sockets; cnt++)
406                 tifm_7xx1_sock_power_off(tifm_7xx1_sock_addr(fm->addr, cnt));
407
408         pci_set_drvdata(dev, NULL);
409
410         iounmap(fm->addr);
411         pci_intx(dev, 0);
412         pci_release_regions(dev);
413
414         pci_disable_device(dev);
415         tifm_free_adapter(fm);
416 }
417
418 static struct pci_device_id tifm_7xx1_pci_tbl [] = {
419         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX21_XX11_FM, PCI_ANY_ID,
420           PCI_ANY_ID, 0, 0, 0 }, /* xx21 - the one I have */
421         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX12_FM, PCI_ANY_ID,
422           PCI_ANY_ID, 0, 0, 0 },
423         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX20_FM, PCI_ANY_ID,
424           PCI_ANY_ID, 0, 0, 0 },
425         { }
426 };
427
428 static struct pci_driver tifm_7xx1_driver = {
429         .name = DRIVER_NAME,
430         .id_table = tifm_7xx1_pci_tbl,
431         .probe = tifm_7xx1_probe,
432         .remove = tifm_7xx1_remove,
433         .suspend = tifm_7xx1_suspend,
434         .resume = tifm_7xx1_resume,
435 };
436
437 static int __init tifm_7xx1_init(void)
438 {
439         return pci_register_driver(&tifm_7xx1_driver);
440 }
441
442 static void __exit tifm_7xx1_exit(void)
443 {
444         pci_unregister_driver(&tifm_7xx1_driver);
445 }
446
447 MODULE_AUTHOR("Alex Dubov");
448 MODULE_DESCRIPTION("TI FlashMedia host driver");
449 MODULE_LICENSE("GPL");
450 MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
451 MODULE_VERSION(DRIVER_VERSION);
452
453 module_init(tifm_7xx1_init);
454 module_exit(tifm_7xx1_exit);