V4L/DVB (3344a): Conversions from kmalloc+memset to k(z|c)alloc
[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         int err;
66
67         /* wait for registers to be programmed */
68         start = jiffies;
69         while (1) {
70                 err = time_after(jiffies, start + HZ/20);
71                 if (saa7146_read(dev, MC2) & 2)
72                         break;
73                 if (err) {
74                         DEB_S(("timed out while waiting for registers getting programmed\n"));
75                         return -ETIMEDOUT;
76                 }
77                 if (nobusyloop)
78                         msleep(1);
79         }
80
81         /* wait for transfer to complete */
82         start = jiffies;
83         while (1) {
84                 err = time_after(jiffies, start + HZ/4);
85                 if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
86                         break;
87                 saa7146_read(dev, MC2);
88                 if (err) {
89                         DEB_S(("timed out while waiting for transfer completion\n"));
90                         return -ETIMEDOUT;
91                 }
92                 if (nobusyloop)
93                         msleep(1);
94         }
95
96         return 0;
97 }
98
99 /****************************************************************************
100  * general helper functions
101  ****************************************************************************/
102
103 /* this is videobuf_vmalloc_to_sg() from video-buf.c
104    make sure virt has been allocated with vmalloc_32(), otherwise the BUG()
105    may be triggered on highmem machines */
106 static struct scatterlist* vmalloc_to_sg(unsigned char *virt, int nr_pages)
107 {
108         struct scatterlist *sglist;
109         struct page *pg;
110         int i;
111
112         sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
113         if (NULL == sglist)
114                 return NULL;
115         for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
116                 pg = vmalloc_to_page(virt);
117                 if (NULL == pg)
118                         goto err;
119                 if (PageHighMem(pg))
120                         BUG();
121                 sglist[i].page   = pg;
122                 sglist[i].length = PAGE_SIZE;
123         }
124         return sglist;
125
126  err:
127         kfree(sglist);
128         return NULL;
129 }
130
131 /********************************************************************************/
132 /* common page table functions */
133
134 char *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa7146_pgtable *pt)
135 {
136         int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
137         char *mem = vmalloc_32(length);
138         int slen = 0;
139
140         if (NULL == mem) {
141                 return NULL;
142         }
143
144         if (!(pt->slist = vmalloc_to_sg(mem, pages))) {
145                 vfree(mem);
146                 return NULL;
147         }
148
149         if (saa7146_pgtable_alloc(pci, pt)) {
150                 kfree(pt->slist);
151                 pt->slist = NULL;
152                 vfree(mem);
153                 return NULL;
154         }
155
156         slen = pci_map_sg(pci,pt->slist,pages,PCI_DMA_FROMDEVICE);
157         if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen)) {
158                 return NULL;
159         }
160
161         return mem;
162 }
163
164 void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt)
165 {
166         if (NULL == pt->cpu)
167                 return;
168         pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
169         pt->cpu = NULL;
170         kfree(pt->slist);
171         pt->slist = NULL;
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         /* clear out mem for sure */
309         dev = kzalloc(sizeof(struct saa7146_dev), GFP_KERNEL);
310         if (!dev) {
311                 ERR(("out of memory.\n"));
312                 goto out;
313         }
314
315         DEB_EE(("pci:%p\n",pci));
316
317         err = pci_enable_device(pci);
318         if (err < 0) {
319                 ERR(("pci_enable_device() failed.\n"));
320                 goto err_free;
321         }
322
323         /* enable bus-mastering */
324         pci_set_master(pci);
325
326         dev->pci = pci;
327
328         /* get chip-revision; this is needed to enable bug-fixes */
329         err = pci_read_config_dword(pci, PCI_CLASS_REVISION, &dev->revision);
330         if (err < 0) {
331                 ERR(("pci_read_config_dword() failed.\n"));
332                 goto err_disable;
333         }
334         dev->revision &= 0xf;
335
336         /* remap the memory from virtual to physical adress */
337
338         err = pci_request_region(pci, 0, "saa7146");
339         if (err < 0)
340                 goto err_disable;
341
342         dev->mem = ioremap(pci_resource_start(pci, 0),
343                            pci_resource_len(pci, 0));
344         if (!dev->mem) {
345                 ERR(("ioremap() failed.\n"));
346                 err = -ENODEV;
347                 goto err_release;
348         }
349
350         /* we don't do a master reset here anymore, it screws up
351            some boards that don't have an i2c-eeprom for configuration
352            values */
353 /*
354         saa7146_write(dev, MC1, MASK_31);
355 */
356
357         /* disable all irqs */
358         saa7146_write(dev, IER, 0);
359
360         /* shut down all dma transfers and rps tasks */
361         saa7146_write(dev, MC1, 0x30ff0000);
362
363         /* clear out any rps-signals pending */
364         saa7146_write(dev, MC2, 0xf8000000);
365
366         /* request an interrupt for the saa7146 */
367         err = request_irq(pci->irq, interrupt_hw, SA_SHIRQ | SA_INTERRUPT,
368                           dev->name, dev);
369         if (err < 0) {
370                 ERR(("request_irq() failed.\n"));
371                 goto err_unmap;
372         }
373
374         err = -ENOMEM;
375
376         /* get memory for various stuff */
377         dev->d_rps0.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
378                                                     &dev->d_rps0.dma_handle);
379         if (!dev->d_rps0.cpu_addr)
380                 goto err_free_irq;
381         memset(dev->d_rps0.cpu_addr, 0x0, SAA7146_RPS_MEM);
382
383         dev->d_rps1.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
384                                                     &dev->d_rps1.dma_handle);
385         if (!dev->d_rps1.cpu_addr)
386                 goto err_free_rps0;
387         memset(dev->d_rps1.cpu_addr, 0x0, SAA7146_RPS_MEM);
388
389         dev->d_i2c.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
390                                                    &dev->d_i2c.dma_handle);
391         if (!dev->d_i2c.cpu_addr)
392                 goto err_free_rps1;
393         memset(dev->d_i2c.cpu_addr, 0x0, SAA7146_RPS_MEM);
394
395         /* the rest + print status message */
396
397         /* create a nice device name */
398         sprintf(dev->name, "saa7146 (%d)", saa7146_num);
399
400         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));
401         dev->ext = ext;
402
403         pci_set_drvdata(pci, dev);
404
405         init_MUTEX(&dev->lock);
406         spin_lock_init(&dev->int_slock);
407         spin_lock_init(&dev->slock);
408
409         init_MUTEX(&dev->i2c_lock);
410
411         dev->module = THIS_MODULE;
412         init_waitqueue_head(&dev->i2c_wq);
413
414         /* set some sane pci arbitrition values */
415         saa7146_write(dev, PCI_BT_V1, 0x1c00101f);
416
417         /* TODO: use the status code of the callback */
418
419         err = -ENODEV;
420
421         if (ext->probe && ext->probe(dev)) {
422                 DEB_D(("ext->probe() failed for %p. skipping device.\n",dev));
423                 goto err_free_i2c;
424         }
425
426         if (ext->attach(dev, pci_ext)) {
427                 DEB_D(("ext->attach() failed for %p. skipping device.\n",dev));
428                 goto err_unprobe;
429         }
430
431         INIT_LIST_HEAD(&dev->item);
432         list_add_tail(&dev->item,&saa7146_devices);
433         saa7146_num++;
434
435         err = 0;
436 out:
437         return err;
438
439 err_unprobe:
440         pci_set_drvdata(pci, NULL);
441 err_free_i2c:
442         pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
443                             dev->d_i2c.dma_handle);
444 err_free_rps1:
445         pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
446                             dev->d_rps1.dma_handle);
447 err_free_rps0:
448         pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
449                             dev->d_rps0.dma_handle);
450 err_free_irq:
451         free_irq(pci->irq, (void *)dev);
452 err_unmap:
453         iounmap(dev->mem);
454 err_release:
455         pci_release_region(pci, 0);
456 err_disable:
457         pci_disable_device(pci);
458 err_free:
459         kfree(dev);
460         goto out;
461 }
462
463 static void saa7146_remove_one(struct pci_dev *pdev)
464 {
465         struct saa7146_dev* dev = pci_get_drvdata(pdev);
466         struct {
467                 void *addr;
468                 dma_addr_t dma;
469         } dev_map[] = {
470                 { dev->d_i2c.cpu_addr, dev->d_i2c.dma_handle },
471                 { dev->d_rps1.cpu_addr, dev->d_rps1.dma_handle },
472                 { dev->d_rps0.cpu_addr, dev->d_rps0.dma_handle },
473                 { NULL, 0 }
474         }, *p;
475
476         DEB_EE(("dev:%p\n",dev));
477
478         dev->ext->detach(dev);
479
480         /* shut down all video dma transfers */
481         saa7146_write(dev, MC1, 0x00ff0000);
482
483         /* disable all irqs, release irq-routine */
484         saa7146_write(dev, IER, 0);
485
486         free_irq(pdev->irq, dev);
487
488         for (p = dev_map; p->addr; p++)
489                 pci_free_consistent(pdev, SAA7146_RPS_MEM, p->addr, p->dma);
490
491         iounmap(dev->mem);
492         pci_release_region(pdev, 0);
493         list_del(&dev->item);
494         pci_disable_device(pdev);
495         kfree(dev);
496
497         saa7146_num--;
498 }
499
500 /*********************************************************************************/
501 /* extension handling functions                                                  */
502
503 int saa7146_register_extension(struct saa7146_extension* ext)
504 {
505         DEB_EE(("ext:%p\n",ext));
506
507         ext->driver.name = ext->name;
508         ext->driver.id_table = ext->pci_tbl;
509         ext->driver.probe = saa7146_init_one;
510         ext->driver.remove = saa7146_remove_one;
511
512         printk("saa7146: register extension '%s'.\n",ext->name);
513         return pci_register_driver(&ext->driver);
514 }
515
516 int saa7146_unregister_extension(struct saa7146_extension* ext)
517 {
518         DEB_EE(("ext:%p\n",ext));
519         printk("saa7146: unregister extension '%s'.\n",ext->name);
520         pci_unregister_driver(&ext->driver);
521         return 0;
522 }
523
524 EXPORT_SYMBOL_GPL(saa7146_register_extension);
525 EXPORT_SYMBOL_GPL(saa7146_unregister_extension);
526
527 /* misc functions used by extension modules */
528 EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc);
529 EXPORT_SYMBOL_GPL(saa7146_pgtable_free);
530 EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single);
531 EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable);
532 EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done);
533
534 EXPORT_SYMBOL_GPL(saa7146_setgpio);
535
536 EXPORT_SYMBOL_GPL(saa7146_i2c_transfer);
537 EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare);
538
539 EXPORT_SYMBOL_GPL(saa7146_debug);
540 EXPORT_SYMBOL_GPL(saa7146_devices);
541 EXPORT_SYMBOL_GPL(saa7146_devices_lock);
542
543 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
544 MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
545 MODULE_LICENSE("GPL");