9dcff14e752ca1fc3f8c8805ed28014802aee25d
[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
14 #define DRIVER_NAME "tifm_7xx1"
15 #define DRIVER_VERSION "0.8"
16
17 #define TIFM_IRQ_ENABLE           0x80000000
18 #define TIFM_IRQ_SOCKMASK(x)      (x)
19 #define TIFM_IRQ_CARDMASK(x)      ((x) << 8)
20 #define TIFM_IRQ_FIFOMASK(x)      ((x) << 16)
21 #define TIFM_IRQ_SETALL           0xffffffff
22
23 static void tifm_7xx1_dummy_eject(struct tifm_adapter *fm,
24                                   struct tifm_dev *sock)
25 {
26 }
27
28 static void tifm_7xx1_eject(struct tifm_adapter *fm, struct tifm_dev *sock)
29 {
30         unsigned long flags;
31
32         spin_lock_irqsave(&fm->lock, flags);
33         fm->socket_change_set |= 1 << sock->socket_id;
34         tifm_queue_work(&fm->media_switcher);
35         spin_unlock_irqrestore(&fm->lock, flags);
36 }
37
38 static irqreturn_t tifm_7xx1_isr(int irq, void *dev_id)
39 {
40         struct tifm_adapter *fm = dev_id;
41         struct tifm_dev *sock;
42         unsigned int irq_status, cnt;
43
44         spin_lock(&fm->lock);
45         irq_status = readl(fm->addr + FM_INTERRUPT_STATUS);
46         if (irq_status == 0 || irq_status == (~0)) {
47                 spin_unlock(&fm->lock);
48                 return IRQ_NONE;
49         }
50
51         if (irq_status & TIFM_IRQ_ENABLE) {
52                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
53
54                 for (cnt = 0; cnt < fm->num_sockets; cnt++) {
55                         sock = fm->sockets[cnt];
56                         if (sock) {
57                                 if ((irq_status >> cnt) & TIFM_IRQ_FIFOMASK(1))
58                                         sock->data_event(sock);
59                                 if ((irq_status >> cnt) & TIFM_IRQ_CARDMASK(1))
60                                         sock->card_event(sock);
61                         }
62                 }
63
64                 fm->socket_change_set |= irq_status
65                                          & ((1 << fm->num_sockets) - 1);
66         }
67         writel(irq_status, fm->addr + FM_INTERRUPT_STATUS);
68
69         if (fm->finish_me)
70                 complete_all(fm->finish_me);
71         else if (!fm->socket_change_set)
72                 writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
73         else
74                 tifm_queue_work(&fm->media_switcher);
75
76         spin_unlock(&fm->lock);
77         return IRQ_HANDLED;
78 }
79
80 static unsigned char tifm_7xx1_toggle_sock_power(char __iomem *sock_addr)
81 {
82         unsigned int s_state;
83         int cnt;
84
85         writel(0x0e00, sock_addr + SOCK_CONTROL);
86
87         for (cnt = 16; cnt <= 256; cnt <<= 1) {
88                 if (!(TIFM_SOCK_STATE_POWERED
89                       & readl(sock_addr + SOCK_PRESENT_STATE)))
90                         break;
91
92                 msleep(cnt);
93         }
94
95         s_state = readl(sock_addr + SOCK_PRESENT_STATE);
96         if (!(TIFM_SOCK_STATE_OCCUPIED & s_state))
97                 return 0;
98
99         writel(readl(sock_addr + SOCK_CONTROL) | TIFM_CTRL_LED,
100                sock_addr + SOCK_CONTROL);
101
102         /* xd needs some extra time before power on */
103         if (((readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7)
104             == TIFM_TYPE_XD)
105                 msleep(40);
106
107         writel((s_state & 7) | 0x0c00, sock_addr + SOCK_CONTROL);
108         /* wait for power to stabilize */
109         msleep(20);
110         for (cnt = 16; cnt <= 256; cnt <<= 1) {
111                 if ((TIFM_SOCK_STATE_POWERED
112                      & readl(sock_addr + SOCK_PRESENT_STATE)))
113                         break;
114
115                 msleep(cnt);
116         }
117
118         writel(readl(sock_addr + SOCK_CONTROL) & (~TIFM_CTRL_LED),
119                sock_addr + SOCK_CONTROL);
120
121         return (readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7;
122 }
123
124 inline static char __iomem *
125 tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
126 {
127         return base_addr + ((sock_num + 1) << 10);
128 }
129
130 static void tifm_7xx1_switch_media(struct work_struct *work)
131 {
132         struct tifm_adapter *fm = container_of(work, struct tifm_adapter,
133                                                media_switcher);
134         struct tifm_dev *sock;
135         unsigned long flags;
136         unsigned char media_id;
137         unsigned int socket_change_set, cnt;
138
139         spin_lock_irqsave(&fm->lock, flags);
140         socket_change_set = fm->socket_change_set;
141         fm->socket_change_set = 0;
142
143         dev_dbg(fm->cdev.dev, "checking media set %x\n",
144                 socket_change_set);
145
146         if (!socket_change_set) {
147                 spin_unlock_irqrestore(&fm->lock, flags);
148                 return;
149         }
150
151         for (cnt = 0; cnt < fm->num_sockets; cnt++) {
152                 if (!(socket_change_set & (1 << cnt)))
153                         continue;
154                 sock = fm->sockets[cnt];
155                 if (sock) {
156                         printk(KERN_INFO
157                                "%s : demand removing card from socket %u:%u\n",
158                                fm->cdev.class_id, fm->id, cnt);
159                         fm->sockets[cnt] = NULL;
160                         spin_unlock_irqrestore(&fm->lock, flags);
161                         device_unregister(&sock->dev);
162                         spin_lock_irqsave(&fm->lock, flags);
163                         writel(0x0e00, tifm_7xx1_sock_addr(fm->addr, cnt)
164                                + SOCK_CONTROL);
165                 }
166
167                 spin_unlock_irqrestore(&fm->lock, flags);
168
169                 media_id = tifm_7xx1_toggle_sock_power(
170                                 tifm_7xx1_sock_addr(fm->addr, cnt));
171
172                 // tifm_alloc_device will check if media_id is valid
173                 sock = tifm_alloc_device(fm, cnt, media_id);
174                 if (sock) {
175                         sock->addr = tifm_7xx1_sock_addr(fm->addr, cnt);
176
177                         if (!device_register(&sock->dev)) {
178                                 spin_lock_irqsave(&fm->lock, flags);
179                                 if (!fm->sockets[cnt]) {
180                                         fm->sockets[cnt] = sock;
181                                         sock = NULL;
182                                 }
183                                 spin_unlock_irqrestore(&fm->lock, flags);
184                         }
185                         if (sock)
186                                 tifm_free_device(&sock->dev);
187                 }
188                 spin_lock_irqsave(&fm->lock, flags);
189         }
190
191         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
192                | TIFM_IRQ_CARDMASK(socket_change_set),
193                fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
194
195         writel(TIFM_IRQ_FIFOMASK(socket_change_set)
196                | TIFM_IRQ_CARDMASK(socket_change_set),
197                fm->addr + FM_SET_INTERRUPT_ENABLE);
198
199         writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
200         spin_unlock_irqrestore(&fm->lock, flags);
201 }
202
203 #ifdef CONFIG_PM
204
205 static int tifm_7xx1_suspend(struct pci_dev *dev, pm_message_t state)
206 {
207         dev_dbg(&dev->dev, "suspending host\n");
208
209         pci_save_state(dev);
210         pci_enable_wake(dev, pci_choose_state(dev, state), 0);
211         pci_disable_device(dev);
212         pci_set_power_state(dev, pci_choose_state(dev, state));
213         return 0;
214 }
215
216 static int tifm_7xx1_resume(struct pci_dev *dev)
217 {
218         struct tifm_adapter *fm = pci_get_drvdata(dev);
219         int rc;
220         unsigned int good_sockets = 0, bad_sockets = 0;
221         unsigned long flags;
222         unsigned char new_ids[fm->num_sockets];
223         DECLARE_COMPLETION_ONSTACK(finish_resume);
224
225         pci_set_power_state(dev, PCI_D0);
226         pci_restore_state(dev);
227         rc = pci_enable_device(dev);
228         if (rc)
229                 return rc;
230         pci_set_master(dev);
231
232         dev_dbg(&dev->dev, "resuming host\n");
233
234         for (rc = 0; rc < fm->num_sockets; rc++)
235                 new_ids[rc] = tifm_7xx1_toggle_sock_power(
236                                         tifm_7xx1_sock_addr(fm->addr, rc));
237         spin_lock_irqsave(&fm->lock, flags);
238         for (rc = 0; rc < fm->num_sockets; rc++) {
239                 if (fm->sockets[rc]) {
240                         if (fm->sockets[rc]->type == new_ids[rc])
241                                 good_sockets |= 1 << rc;
242                         else
243                                 bad_sockets |= 1 << rc;
244                 }
245         }
246
247         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
248                fm->addr + FM_SET_INTERRUPT_ENABLE);
249         dev_dbg(&dev->dev, "change sets on resume: good %x, bad %x\n",
250                 good_sockets, bad_sockets);
251
252         fm->socket_change_set = 0;
253         if (good_sockets) {
254                 fm->finish_me = &finish_resume;
255                 spin_unlock_irqrestore(&fm->lock, flags);
256                 rc = wait_for_completion_timeout(&finish_resume, HZ);
257                 dev_dbg(&dev->dev, "wait returned %d\n", rc);
258                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
259                        | TIFM_IRQ_CARDMASK(good_sockets),
260                        fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
261                 writel(TIFM_IRQ_FIFOMASK(good_sockets)
262                        | TIFM_IRQ_CARDMASK(good_sockets),
263                        fm->addr + FM_SET_INTERRUPT_ENABLE);
264                 spin_lock_irqsave(&fm->lock, flags);
265                 fm->finish_me = NULL;
266                 fm->socket_change_set ^= good_sockets & fm->socket_change_set;
267         }
268
269         fm->socket_change_set |= bad_sockets;
270         if (fm->socket_change_set)
271                 tifm_queue_work(&fm->media_switcher);
272
273         spin_unlock_irqrestore(&fm->lock, flags);
274         writel(TIFM_IRQ_ENABLE,
275                fm->addr + FM_SET_INTERRUPT_ENABLE);
276
277         return 0;
278 }
279
280 #else
281
282 #define tifm_7xx1_suspend NULL
283 #define tifm_7xx1_resume NULL
284
285 #endif /* CONFIG_PM */
286
287 static int tifm_7xx1_probe(struct pci_dev *dev,
288                            const struct pci_device_id *dev_id)
289 {
290         struct tifm_adapter *fm;
291         int pci_dev_busy = 0;
292         int rc;
293
294         rc = pci_set_dma_mask(dev, DMA_32BIT_MASK);
295         if (rc)
296                 return rc;
297
298         rc = pci_enable_device(dev);
299         if (rc)
300                 return rc;
301
302         pci_set_master(dev);
303
304         rc = pci_request_regions(dev, DRIVER_NAME);
305         if (rc) {
306                 pci_dev_busy = 1;
307                 goto err_out;
308         }
309
310         pci_intx(dev, 1);
311
312         fm = tifm_alloc_adapter(dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM
313                                 ? 4 : 2, &dev->dev);
314         if (!fm) {
315                 rc = -ENOMEM;
316                 goto err_out_int;
317         }
318
319         INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);
320         fm->eject = tifm_7xx1_eject;
321         pci_set_drvdata(dev, fm);
322
323         fm->addr = ioremap(pci_resource_start(dev, 0),
324                            pci_resource_len(dev, 0));
325         if (!fm->addr)
326                 goto err_out_free;
327
328         rc = request_irq(dev->irq, tifm_7xx1_isr, SA_SHIRQ, DRIVER_NAME, fm);
329         if (rc)
330                 goto err_out_unmap;
331
332         rc = tifm_add_adapter(fm);
333         if (rc)
334                 goto err_out_irq;
335
336         writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
337                fm->addr + FM_SET_INTERRUPT_ENABLE);
338         return 0;
339
340 err_out_irq:
341         free_irq(dev->irq, fm);
342 err_out_unmap:
343         iounmap(fm->addr);
344 err_out_free:
345         pci_set_drvdata(dev, NULL);
346         tifm_free_adapter(fm);
347 err_out_int:
348         pci_intx(dev, 0);
349         pci_release_regions(dev);
350 err_out:
351         if (!pci_dev_busy)
352                 pci_disable_device(dev);
353         return rc;
354 }
355
356 static void tifm_7xx1_remove(struct pci_dev *dev)
357 {
358         struct tifm_adapter *fm = pci_get_drvdata(dev);
359
360         fm->eject = tifm_7xx1_dummy_eject;
361         writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
362         mmiowb();
363         free_irq(dev->irq, fm);
364
365         tifm_remove_adapter(fm);
366
367         pci_set_drvdata(dev, NULL);
368
369         iounmap(fm->addr);
370         pci_intx(dev, 0);
371         pci_release_regions(dev);
372
373         pci_disable_device(dev);
374         tifm_free_adapter(fm);
375 }
376
377 static struct pci_device_id tifm_7xx1_pci_tbl [] = {
378         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX21_XX11_FM, PCI_ANY_ID,
379           PCI_ANY_ID, 0, 0, 0 }, /* xx21 - the one I have */
380         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX12_FM, PCI_ANY_ID,
381           PCI_ANY_ID, 0, 0, 0 },
382         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX20_FM, PCI_ANY_ID,
383           PCI_ANY_ID, 0, 0, 0 },
384         { }
385 };
386
387 static struct pci_driver tifm_7xx1_driver = {
388         .name = DRIVER_NAME,
389         .id_table = tifm_7xx1_pci_tbl,
390         .probe = tifm_7xx1_probe,
391         .remove = tifm_7xx1_remove,
392         .suspend = tifm_7xx1_suspend,
393         .resume = tifm_7xx1_resume,
394 };
395
396 static int __init tifm_7xx1_init(void)
397 {
398         return pci_register_driver(&tifm_7xx1_driver);
399 }
400
401 static void __exit tifm_7xx1_exit(void)
402 {
403         pci_unregister_driver(&tifm_7xx1_driver);
404 }
405
406 MODULE_AUTHOR("Alex Dubov");
407 MODULE_DESCRIPTION("TI FlashMedia host driver");
408 MODULE_LICENSE("GPL");
409 MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
410 MODULE_VERSION(DRIVER_VERSION);
411
412 module_init(tifm_7xx1_init);
413 module_exit(tifm_7xx1_exit);