[PATCH] dvb: saa7146: no need to initialize static/global variables to 0
[linux-2.6.git] / drivers / media / common / saa7146_core.c
1 /*
2     saa7146.o - driver for generic saa7146-based hardware
3
4     Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
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 as published by
8     the Free Software Foundation; either version 2 of the License, or
9     (at your option) any later version.
10
11     This program is distributed in the hope that it will be useful,
12     but WITHOUT ANY WARRANTY; without even the implied warranty of
13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14     GNU General Public License for more details.
15
16     You should have received a copy of the GNU General Public License
17     along with this program; if not, write to the Free Software
18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 #include <media/saa7146.h>
22
23 LIST_HEAD(saa7146_devices);
24 DECLARE_MUTEX(saa7146_devices_lock);
25
26 static int saa7146_num;
27
28 unsigned int saa7146_debug;
29
30 module_param(saa7146_debug, int, 0644);
31 MODULE_PARM_DESC(saa7146_debug, "debug level (default: 0)");
32
33 #if 0
34 static void dump_registers(struct saa7146_dev* dev)
35 {
36         int i = 0;
37
38         INFO((" @ %li jiffies:\n",jiffies));
39         for(i = 0; i <= 0x148; i+=4) {
40                 printk("0x%03x: 0x%08x\n",i,saa7146_read(dev,i));
41         }
42 }
43 #endif
44
45 /****************************************************************************
46  * gpio and debi helper functions
47  ****************************************************************************/
48
49 void saa7146_setgpio(struct saa7146_dev *dev, int port, u32 data)
50 {
51         u32 value = 0;
52
53         BUG_ON(port > 3);
54
55         value = saa7146_read(dev, GPIO_CTRL);
56         value &= ~(0xff << (8*port));
57         value |= (data << (8*port));
58         saa7146_write(dev, GPIO_CTRL, value);
59 }
60
61 /* This DEBI code is based on the saa7146 Stradis driver by Nathan Laredo */
62 int saa7146_wait_for_debi_done(struct saa7146_dev *dev, int nobusyloop)
63 {
64         unsigned long start;
65
66         /* wait for registers to be programmed */
67         start = jiffies;
68         while (1) {
69                 if (saa7146_read(dev, MC2) & 2)
70                         break;
71                 if (time_after(jiffies, start + HZ/20)) {
72                         DEB_S(("timed out while waiting for registers getting programmed\n"));
73                         return -ETIMEDOUT;
74                 }
75                 if (nobusyloop)
76                         msleep(1);
77         }
78
79         /* wait for transfer to complete */
80         start = jiffies;
81         while (1) {
82                 if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
83                         break;
84                 saa7146_read(dev, MC2);
85                 if (time_after(jiffies, start + HZ/4)) {
86                         DEB_S(("timed out while waiting for transfer completion\n"));
87                         return -ETIMEDOUT;
88                 }
89                 if (nobusyloop)
90                         msleep(1);
91         }
92
93         return 0;
94 }
95
96 /****************************************************************************
97  * general helper functions
98  ****************************************************************************/
99
100 /* this is videobuf_vmalloc_to_sg() from video-buf.c
101    make sure virt has been allocated with vmalloc_32(), otherwise the BUG()
102    may be triggered on highmem machines */
103 static struct scatterlist* vmalloc_to_sg(unsigned char *virt, int nr_pages)
104 {
105         struct scatterlist *sglist;
106         struct page *pg;
107         int i;
108
109         sglist = kmalloc(sizeof(struct scatterlist)*nr_pages, GFP_KERNEL);
110         if (NULL == sglist)
111                 return NULL;
112         memset(sglist,0,sizeof(struct scatterlist)*nr_pages);
113         for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
114                 pg = vmalloc_to_page(virt);
115                 if (NULL == pg)
116                         goto err;
117                 if (PageHighMem(pg))
118                         BUG();
119                 sglist[i].page   = pg;
120                 sglist[i].length = PAGE_SIZE;
121         }
122         return sglist;
123
124  err:
125         kfree(sglist);
126         return NULL;
127 }
128
129 /********************************************************************************/
130 /* common page table functions */
131
132 char *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa7146_pgtable *pt)
133 {
134         int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
135         char *mem = vmalloc_32(length);
136         int slen = 0;
137
138         if (NULL == mem) {
139                 return NULL;
140         }
141
142         if (!(pt->slist = vmalloc_to_sg(mem, pages))) {
143                 vfree(mem);
144                 return NULL;
145         }
146
147         if (saa7146_pgtable_alloc(pci, pt)) {
148                 kfree(pt->slist);
149                 pt->slist = NULL;
150                 vfree(mem);
151                 return NULL;
152         }
153
154         slen = pci_map_sg(pci,pt->slist,pages,PCI_DMA_FROMDEVICE);
155         if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen)) {
156                 return NULL;
157         }
158
159         return mem;
160 }
161
162 void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt)
163 {
164         if (NULL == pt->cpu)
165                 return;
166         pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
167         pt->cpu = NULL;
168         if (NULL != pt->slist) {
169                 kfree(pt->slist);
170                 pt->slist = NULL;
171         }
172 }
173
174 int saa7146_pgtable_alloc(struct pci_dev *pci, struct saa7146_pgtable *pt)
175 {
176         u32          *cpu;
177         dma_addr_t   dma_addr;
178
179         cpu = pci_alloc_consistent(pci, PAGE_SIZE, &dma_addr);
180         if (NULL == cpu) {
181                 return -ENOMEM;
182         }
183         pt->size = PAGE_SIZE;
184         pt->cpu  = cpu;
185         pt->dma  = dma_addr;
186
187         return 0;
188 }
189
190 int saa7146_pgtable_build_single(struct pci_dev *pci, struct saa7146_pgtable *pt,
191         struct scatterlist *list, int sglen  )
192 {
193         u32 *ptr, fill;
194         int nr_pages = 0;
195         int i,p;
196
197         BUG_ON(0 == sglen);
198         BUG_ON(list->offset > PAGE_SIZE);
199
200         /* if we have a user buffer, the first page may not be
201            aligned to a page boundary. */
202         pt->offset = list->offset;
203
204         ptr = pt->cpu;
205         for (i = 0; i < sglen; i++, list++) {
206 /*
207                 printk("i:%d, adr:0x%08x, len:%d, offset:%d\n", i,sg_dma_address(list), sg_dma_len(list), list->offset);
208 */
209                 for (p = 0; p * 4096 < list->length; p++, ptr++) {
210                         *ptr = cpu_to_le32(sg_dma_address(list) + p * 4096);
211                         nr_pages++;
212                 }
213         }
214
215
216         /* safety; fill the page table up with the last valid page */
217         fill = *(ptr-1);
218         for(i=nr_pages;i<1024;i++) {
219                 *ptr++ = fill;
220         }
221
222 /*
223         ptr = pt->cpu;
224         printk("offset: %d\n",pt->offset);
225         for(i=0;i<5;i++) {
226                 printk("ptr1 %d: 0x%08x\n",i,ptr[i]);
227         }
228 */
229         return 0;
230 }
231
232 /********************************************************************************/
233 /* interrupt handler */
234 static irqreturn_t interrupt_hw(int irq, void *dev_id, struct pt_regs *regs)
235 {
236         struct saa7146_dev *dev = dev_id;
237         u32 isr = 0;
238
239         /* read out the interrupt status register */
240         isr = saa7146_read(dev, ISR);
241
242         /* is this our interrupt? */
243         if ( 0 == isr ) {
244                 /* nope, some other device */
245                 return IRQ_NONE;
246         }
247
248         saa7146_write(dev, ISR, isr);
249
250         if( 0 != (dev->ext)) {
251                 if( 0 != (dev->ext->irq_mask & isr )) {
252                         if( 0 != dev->ext->irq_func ) {
253                                 dev->ext->irq_func(dev, &isr);
254                         }
255                         isr &= ~dev->ext->irq_mask;
256                 }
257         }
258         if (0 != (isr & (MASK_27))) {
259                 DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
260                 if( 0 != dev->vv_data && 0 != dev->vv_callback) {
261                         dev->vv_callback(dev,isr);
262                 }
263                 isr &= ~MASK_27;
264         }
265         if (0 != (isr & (MASK_28))) {
266                 if( 0 != dev->vv_data && 0 != dev->vv_callback) {
267                         dev->vv_callback(dev,isr);
268                 }
269                 isr &= ~MASK_28;
270         }
271         if (0 != (isr & (MASK_16|MASK_17))) {
272                 u32 status = saa7146_read(dev, I2C_STATUS);
273                 if( (0x3 == (status & 0x3)) || (0 == (status & 0x1)) ) {
274                         SAA7146_IER_DISABLE(dev, MASK_16|MASK_17);
275                         /* only wake up if we expect something */
276                         if( 0 != dev->i2c_op ) {
277                                 u32 psr = (saa7146_read(dev, PSR) >> 16) & 0x2;
278                                 u32 ssr = (saa7146_read(dev, SSR) >> 17) & 0x1f;
279                                 DEB_I2C(("irq: i2c, status: 0x%08x, psr:0x%02x, ssr:0x%02x).\n",status,psr,ssr));
280                                 dev->i2c_op = 0;
281                                 wake_up(&dev->i2c_wq);
282                         } else {
283                                 DEB_I2C(("unexpected irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
284                         }
285                 } else {
286                         DEB_I2C(("unhandled irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
287                 }
288                 isr &= ~(MASK_16|MASK_17);
289         }
290         if( 0 != isr ) {
291                 ERR(("warning: interrupt enabled, but not handled properly.(0x%08x)\n",isr));
292                 ERR(("disabling interrupt source(s)!\n"));
293                 SAA7146_IER_DISABLE(dev,isr);
294         }
295         return IRQ_HANDLED;
296 }
297
298 /*********************************************************************************/
299 /* configuration-functions                                                       */
300
301 static int saa7146_init_one(struct pci_dev *pci, const struct pci_device_id *ent)
302 {
303         struct saa7146_pci_extension_data *pci_ext = (struct saa7146_pci_extension_data *)ent->driver_data;
304         struct saa7146_extension *ext = pci_ext->ext;
305         struct saa7146_dev *dev;
306         int err = -ENOMEM;
307
308         dev = kmalloc(sizeof(struct saa7146_dev), GFP_KERNEL);
309         if (!dev) {
310                 ERR(("out of memory.\n"));
311                 goto out;
312         }
313
314         /* clear out mem for sure */
315         memset(dev, 0x0, sizeof(struct saa7146_dev));
316
317         DEB_EE(("pci:%p\n",pci));
318
319         err = pci_enable_device(pci);
320         if (err < 0) {
321                 ERR(("pci_enable_device() failed.\n"));
322                 goto err_free;
323         }
324
325         /* enable bus-mastering */
326         pci_set_master(pci);
327
328         dev->pci = pci;
329
330         /* get chip-revision; this is needed to enable bug-fixes */
331         err = pci_read_config_dword(pci, PCI_CLASS_REVISION, &dev->revision);
332         if (err < 0) {
333                 ERR(("pci_read_config_dword() failed.\n"));
334                 goto err_disable;
335         }
336         dev->revision &= 0xf;
337
338         /* remap the memory from virtual to physical adress */
339
340         err = pci_request_region(pci, 0, "saa7146");
341         if (err < 0)
342                 goto err_disable;
343
344         dev->mem = ioremap(pci_resource_start(pci, 0),
345                            pci_resource_len(pci, 0));
346         if (!dev->mem) {
347                 ERR(("ioremap() failed.\n"));
348                 err = -ENODEV;
349                 goto err_release;
350         }
351
352         /* we don't do a master reset here anymore, it screws up
353            some boards that don't have an i2c-eeprom for configuration
354            values */
355 /*
356         saa7146_write(dev, MC1, MASK_31);
357 */
358
359         /* disable all irqs */
360         saa7146_write(dev, IER, 0);
361
362         /* shut down all dma transfers and rps tasks */
363         saa7146_write(dev, MC1, 0x30ff0000);
364
365         /* clear out any rps-signals pending */
366         saa7146_write(dev, MC2, 0xf8000000);
367
368         /* request an interrupt for the saa7146 */
369         err = request_irq(pci->irq, interrupt_hw, SA_SHIRQ | SA_INTERRUPT,
370                           dev->name, dev);
371         if (err < 0) {
372                 ERR(("request_irq() failed.\n"));
373                 goto err_unmap;
374         }
375
376         err = -ENOMEM;
377
378         /* get memory for various stuff */
379         dev->d_rps0.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
380                                                     &dev->d_rps0.dma_handle);
381         if (!dev->d_rps0.cpu_addr)
382                 goto err_free_irq;
383         memset(dev->d_rps0.cpu_addr, 0x0, SAA7146_RPS_MEM);
384
385         dev->d_rps1.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
386                                                     &dev->d_rps1.dma_handle);
387         if (!dev->d_rps1.cpu_addr)
388                 goto err_free_rps0;
389         memset(dev->d_rps1.cpu_addr, 0x0, SAA7146_RPS_MEM);
390
391         dev->d_i2c.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
392                                                    &dev->d_i2c.dma_handle);
393         if (!dev->d_i2c.cpu_addr)
394                 goto err_free_rps1;
395         memset(dev->d_i2c.cpu_addr, 0x0, SAA7146_RPS_MEM);
396
397         /* the rest + print status message */
398
399         /* create a nice device name */
400         sprintf(dev->name, "saa7146 (%d)", saa7146_num);
401
402         INFO(("found saa7146 @ mem %p (revision %d, irq %d) (0x%04x,0x%04x).\n", dev->mem, dev->revision, pci->irq, pci->subsystem_vendor, pci->subsystem_device));
403         dev->ext = ext;
404
405         pci_set_drvdata(pci, dev);
406
407         init_MUTEX(&dev->lock);
408         spin_lock_init(&dev->int_slock);
409         spin_lock_init(&dev->slock);
410
411         init_MUTEX(&dev->i2c_lock);
412
413         dev->module = THIS_MODULE;
414         init_waitqueue_head(&dev->i2c_wq);
415
416         /* set some sane pci arbitrition values */
417         saa7146_write(dev, PCI_BT_V1, 0x1c00101f);
418
419         /* TODO: use the status code of the callback */
420
421         err = -ENODEV;
422
423         if (ext->probe && ext->probe(dev)) {
424                 DEB_D(("ext->probe() failed for %p. skipping device.\n",dev));
425                 goto err_free_i2c;
426         }
427
428         if (ext->attach(dev, pci_ext)) {
429                 DEB_D(("ext->attach() failed for %p. skipping device.\n",dev));
430                 goto err_unprobe;
431         }
432
433         INIT_LIST_HEAD(&dev->item);
434         list_add_tail(&dev->item,&saa7146_devices);
435         saa7146_num++;
436
437         err = 0;
438 out:
439         return err;
440
441 err_unprobe:
442         pci_set_drvdata(pci, NULL);
443 err_free_i2c:
444         pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
445                             dev->d_i2c.dma_handle);
446 err_free_rps1:
447         pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
448                             dev->d_rps1.dma_handle);
449 err_free_rps0:
450         pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
451                             dev->d_rps0.dma_handle);
452 err_free_irq:
453         free_irq(pci->irq, (void *)dev);
454 err_unmap:
455         iounmap(dev->mem);
456 err_release:
457         pci_release_region(pci, 0);
458 err_disable:
459         pci_disable_device(pci);
460 err_free:
461         kfree(dev);
462         goto out;
463 }
464
465 static void saa7146_remove_one(struct pci_dev *pdev)
466 {
467         struct saa7146_dev* dev = pci_get_drvdata(pdev);
468         struct {
469                 void *addr;
470                 dma_addr_t dma;
471         } dev_map[] = {
472                 { dev->d_i2c.cpu_addr, dev->d_i2c.dma_handle },
473                 { dev->d_rps1.cpu_addr, dev->d_rps1.dma_handle },
474                 { dev->d_rps0.cpu_addr, dev->d_rps0.dma_handle },
475                 { NULL, 0 }
476         }, *p;
477
478         DEB_EE(("dev:%p\n",dev));
479
480         dev->ext->detach(dev);
481
482         /* shut down all video dma transfers */
483         saa7146_write(dev, MC1, 0x00ff0000);
484
485         /* disable all irqs, release irq-routine */
486         saa7146_write(dev, IER, 0);
487
488         free_irq(pdev->irq, dev);
489
490         for (p = dev_map; p->addr; p++)
491                 pci_free_consistent(pdev, SAA7146_RPS_MEM, p->addr, p->dma);
492
493         iounmap(dev->mem);
494         pci_release_region(pdev, 0);
495         list_del(&dev->item);
496         pci_disable_device(pdev);
497         kfree(dev);
498
499         saa7146_num--;
500 }
501
502 /*********************************************************************************/
503 /* extension handling functions                                                  */
504
505 int saa7146_register_extension(struct saa7146_extension* ext)
506 {
507         DEB_EE(("ext:%p\n",ext));
508
509         ext->driver.name = ext->name;
510         ext->driver.id_table = ext->pci_tbl;
511         ext->driver.probe = saa7146_init_one;
512         ext->driver.remove = saa7146_remove_one;
513
514         printk("saa7146: register extension '%s'.\n",ext->name);
515         return pci_module_init(&ext->driver);
516 }
517
518 int saa7146_unregister_extension(struct saa7146_extension* ext)
519 {
520         DEB_EE(("ext:%p\n",ext));
521         printk("saa7146: unregister extension '%s'.\n",ext->name);
522         pci_unregister_driver(&ext->driver);
523         return 0;
524 }
525
526 EXPORT_SYMBOL_GPL(saa7146_register_extension);
527 EXPORT_SYMBOL_GPL(saa7146_unregister_extension);
528
529 /* misc functions used by extension modules */
530 EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc);
531 EXPORT_SYMBOL_GPL(saa7146_pgtable_free);
532 EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single);
533 EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable);
534 EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done);
535
536 EXPORT_SYMBOL_GPL(saa7146_setgpio);
537
538 EXPORT_SYMBOL_GPL(saa7146_i2c_transfer);
539 EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare);
540
541 EXPORT_SYMBOL_GPL(saa7146_debug);
542 EXPORT_SYMBOL_GPL(saa7146_devices);
543 EXPORT_SYMBOL_GPL(saa7146_devices_lock);
544
545 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
546 MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
547 MODULE_LICENSE("GPL");