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1/*
2 * Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved.
3 * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
4 * Copyright 2009 Jonathan Corbet <corbet@lwn.net>
5 */
6
7/*
8 * Core code for the Via multifunction framebuffer device.
9 */
10#include <linux/via-core.h>
11#include <linux/via_i2c.h>
12#include <linux/via-gpio.h>
13#include "global.h"
14
15#include <linux/module.h>
16#include <linux/interrupt.h>
17#include <linux/platform_device.h>
18#include <linux/list.h>
19#include <linux/pm.h>
20#include <asm/olpc.h>
21
22/*
23 * The default port config.
24 */
25static struct via_port_cfg adap_configs[] = {
26 [VIA_PORT_26] = { VIA_PORT_I2C, VIA_MODE_I2C, VIASR, 0x26 },
27 [VIA_PORT_31] = { VIA_PORT_I2C, VIA_MODE_I2C, VIASR, 0x31 },
28 [VIA_PORT_25] = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x25 },
29 [VIA_PORT_2C] = { VIA_PORT_GPIO, VIA_MODE_I2C, VIASR, 0x2c },
30 [VIA_PORT_3D] = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x3d },
31 { 0, 0, 0, 0 }
32};
33
34/*
35 * The OLPC XO-1.5 puts the camera power and reset lines onto
36 * GPIO 2C.
37 */
38static struct via_port_cfg olpc_adap_configs[] = {
39 [VIA_PORT_26] = { VIA_PORT_I2C, VIA_MODE_I2C, VIASR, 0x26 },
40 [VIA_PORT_31] = { VIA_PORT_I2C, VIA_MODE_I2C, VIASR, 0x31 },
41 [VIA_PORT_25] = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x25 },
42 [VIA_PORT_2C] = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x2c },
43 [VIA_PORT_3D] = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x3d },
44 { 0, 0, 0, 0 }
45};
46
47/*
48 * We currently only support one viafb device (will there ever be
49 * more than one?), so just declare it globally here.
50 */
51static struct viafb_dev global_dev;
52
53
54/*
55 * Basic register access; spinlock required.
56 */
57static inline void viafb_mmio_write(int reg, u32 v)
58{
59 iowrite32(v, global_dev.engine_mmio + reg);
60}
61
62static inline int viafb_mmio_read(int reg)
63{
64 return ioread32(global_dev.engine_mmio + reg);
65}
66
67/* ---------------------------------------------------------------------- */
68/*
69 * Interrupt management. We have a single IRQ line for a lot of
70 * different functions, so we need to share it. The design here
71 * is that we don't want to reimplement the shared IRQ code here;
72 * we also want to avoid having contention for a single handler thread.
73 * So each subdev driver which needs interrupts just requests
74 * them directly from the kernel. We just have what's needed for
75 * overall access to the interrupt control register.
76 */
77
78/*
79 * Which interrupts are enabled now?
80 */
81static u32 viafb_enabled_ints;
82
83static void viafb_int_init(void)
84{
85 viafb_enabled_ints = 0;
86
87 viafb_mmio_write(VDE_INTERRUPT, 0);
88}
89
90/*
91 * Allow subdevs to ask for specific interrupts to be enabled. These
92 * functions must be called with reg_lock held
93 */
94void viafb_irq_enable(u32 mask)
95{
96 viafb_enabled_ints |= mask;
97 viafb_mmio_write(VDE_INTERRUPT, viafb_enabled_ints | VDE_I_ENABLE);
98}
99EXPORT_SYMBOL_GPL(viafb_irq_enable);
100
101void viafb_irq_disable(u32 mask)
102{
103 viafb_enabled_ints &= ~mask;
104 if (viafb_enabled_ints == 0)
105 viafb_mmio_write(VDE_INTERRUPT, 0); /* Disable entirely */
106 else
107 viafb_mmio_write(VDE_INTERRUPT,
108 viafb_enabled_ints | VDE_I_ENABLE);
109}
110EXPORT_SYMBOL_GPL(viafb_irq_disable);
111
112/* ---------------------------------------------------------------------- */
113/*
114 * Currently, the camera driver is the only user of the DMA code, so we
115 * only compile it in if the camera driver is being built. Chances are,
116 * most viafb systems will not need to have this extra code for a while.
117 * As soon as another user comes long, the ifdef can be removed.
118 */
119#if IS_ENABLED(CONFIG_VIDEO_VIA_CAMERA)
120/*
121 * Access to the DMA engine. This currently provides what the camera
122 * driver needs (i.e. outgoing only) but is easily expandable if need
123 * be.
124 */
125
126/*
127 * There are four DMA channels in the vx855. For now, we only
128 * use one of them, though. Most of the time, the DMA channel
129 * will be idle, so we keep the IRQ handler unregistered except
130 * when some subsystem has indicated an interest.
131 */
132static int viafb_dma_users;
133static DECLARE_COMPLETION(viafb_dma_completion);
134/*
135 * This mutex protects viafb_dma_users and our global interrupt
136 * registration state; it also serializes access to the DMA
137 * engine.
138 */
139static DEFINE_MUTEX(viafb_dma_lock);
140
141/*
142 * The VX855 DMA descriptor (used for s/g transfers) looks
143 * like this.
144 */
145struct viafb_vx855_dma_descr {
146 u32 addr_low; /* Low part of phys addr */
147 u32 addr_high; /* High 12 bits of addr */
148 u32 fb_offset; /* Offset into FB memory */
149 u32 seg_size; /* Size, 16-byte units */
150 u32 tile_mode; /* "tile mode" setting */
151 u32 next_desc_low; /* Next descriptor addr */
152 u32 next_desc_high;
153 u32 pad; /* Fill out to 64 bytes */
154};
155
156/*
157 * Flags added to the "next descriptor low" pointers
158 */
159#define VIAFB_DMA_MAGIC 0x01 /* ??? Just has to be there */
160#define VIAFB_DMA_FINAL_SEGMENT 0x02 /* Final segment */
161
162/*
163 * The completion IRQ handler.
164 */
165static irqreturn_t viafb_dma_irq(int irq, void *data)
166{
167 int csr;
168 irqreturn_t ret = IRQ_NONE;
169
170 spin_lock(&global_dev.reg_lock);
171 csr = viafb_mmio_read(VDMA_CSR0);
172 if (csr & VDMA_C_DONE) {
173 viafb_mmio_write(VDMA_CSR0, VDMA_C_DONE);
174 complete(&viafb_dma_completion);
175 ret = IRQ_HANDLED;
176 }
177 spin_unlock(&global_dev.reg_lock);
178 return ret;
179}
180
181/*
182 * Indicate a need for DMA functionality.
183 */
184int viafb_request_dma(void)
185{
186 int ret = 0;
187
188 /*
189 * Only VX855 is supported currently.
190 */
191 if (global_dev.chip_type != UNICHROME_VX855)
192 return -ENODEV;
193 /*
194 * Note the new user and set up our interrupt handler
195 * if need be.
196 */
197 mutex_lock(&viafb_dma_lock);
198 viafb_dma_users++;
199 if (viafb_dma_users == 1) {
200 ret = request_irq(global_dev.pdev->irq, viafb_dma_irq,
201 IRQF_SHARED, "via-dma", &viafb_dma_users);
202 if (ret)
203 viafb_dma_users--;
204 else
205 viafb_irq_enable(VDE_I_DMA0TDEN);
206 }
207 mutex_unlock(&viafb_dma_lock);
208 return ret;
209}
210EXPORT_SYMBOL_GPL(viafb_request_dma);
211
212void viafb_release_dma(void)
213{
214 mutex_lock(&viafb_dma_lock);
215 viafb_dma_users--;
216 if (viafb_dma_users == 0) {
217 viafb_irq_disable(VDE_I_DMA0TDEN);
218 free_irq(global_dev.pdev->irq, &viafb_dma_users);
219 }
220 mutex_unlock(&viafb_dma_lock);
221}
222EXPORT_SYMBOL_GPL(viafb_release_dma);
223
224
225#if 0
226/*
227 * Copy a single buffer from FB memory, synchronously. This code works
228 * but is not currently used.
229 */
230void viafb_dma_copy_out(unsigned int offset, dma_addr_t paddr, int len)
231{
232 unsigned long flags;
233 int csr;
234
235 mutex_lock(&viafb_dma_lock);
236 init_completion(&viafb_dma_completion);
237 /*
238 * Program the controller.
239 */
240 spin_lock_irqsave(&global_dev.reg_lock, flags);
241 viafb_mmio_write(VDMA_CSR0, VDMA_C_ENABLE|VDMA_C_DONE);
242 /* Enable ints; must happen after CSR0 write! */
243 viafb_mmio_write(VDMA_MR0, VDMA_MR_TDIE);
244 viafb_mmio_write(VDMA_MARL0, (int) (paddr & 0xfffffff0));
245 viafb_mmio_write(VDMA_MARH0, (int) ((paddr >> 28) & 0xfff));
246 /* Data sheet suggests DAR0 should be <<4, but it lies */
247 viafb_mmio_write(VDMA_DAR0, offset);
248 viafb_mmio_write(VDMA_DQWCR0, len >> 4);
249 viafb_mmio_write(VDMA_TMR0, 0);
250 viafb_mmio_write(VDMA_DPRL0, 0);
251 viafb_mmio_write(VDMA_DPRH0, 0);
252 viafb_mmio_write(VDMA_PMR0, 0);
253 csr = viafb_mmio_read(VDMA_CSR0);
254 viafb_mmio_write(VDMA_CSR0, VDMA_C_ENABLE|VDMA_C_START);
255 spin_unlock_irqrestore(&global_dev.reg_lock, flags);
256 /*
257 * Now we just wait until the interrupt handler says
258 * we're done.
259 */
260 wait_for_completion_interruptible(&viafb_dma_completion);
261 viafb_mmio_write(VDMA_MR0, 0); /* Reset int enable */
262 mutex_unlock(&viafb_dma_lock);
263}
264EXPORT_SYMBOL_GPL(viafb_dma_copy_out);
265#endif
266
267/*
268 * Do a scatter/gather DMA copy from FB memory. You must have done
269 * a successful call to viafb_request_dma() first.
270 */
271int viafb_dma_copy_out_sg(unsigned int offset, struct scatterlist *sg, int nsg)
272{
273 struct viafb_vx855_dma_descr *descr;
274 void *descrpages;
275 dma_addr_t descr_handle;
276 unsigned long flags;
277 int i;
278 struct scatterlist *sgentry;
279 dma_addr_t nextdesc;
280
281 /*
282 * Get a place to put the descriptors.
283 */
284 descrpages = dma_alloc_coherent(&global_dev.pdev->dev,
285 nsg*sizeof(struct viafb_vx855_dma_descr),
286 &descr_handle, GFP_KERNEL);
287 if (descrpages == NULL) {
288 dev_err(&global_dev.pdev->dev, "Unable to get descr page.\n");
289 return -ENOMEM;
290 }
291 mutex_lock(&viafb_dma_lock);
292 /*
293 * Fill them in.
294 */
295 descr = descrpages;
296 nextdesc = descr_handle + sizeof(struct viafb_vx855_dma_descr);
297 for_each_sg(sg, sgentry, nsg, i) {
298 dma_addr_t paddr = sg_dma_address(sgentry);
299 descr->addr_low = paddr & 0xfffffff0;
300 descr->addr_high = ((u64) paddr >> 32) & 0x0fff;
301 descr->fb_offset = offset;
302 descr->seg_size = sg_dma_len(sgentry) >> 4;
303 descr->tile_mode = 0;
304 descr->next_desc_low = (nextdesc&0xfffffff0) | VIAFB_DMA_MAGIC;
305 descr->next_desc_high = ((u64) nextdesc >> 32) & 0x0fff;
306 descr->pad = 0xffffffff; /* VIA driver does this */
307 offset += sg_dma_len(sgentry);
308 nextdesc += sizeof(struct viafb_vx855_dma_descr);
309 descr++;
310 }
311 descr[-1].next_desc_low = VIAFB_DMA_FINAL_SEGMENT|VIAFB_DMA_MAGIC;
312 /*
313 * Program the engine.
314 */
315 spin_lock_irqsave(&global_dev.reg_lock, flags);
316 init_completion(&viafb_dma_completion);
317 viafb_mmio_write(VDMA_DQWCR0, 0);
318 viafb_mmio_write(VDMA_CSR0, VDMA_C_ENABLE|VDMA_C_DONE);
319 viafb_mmio_write(VDMA_MR0, VDMA_MR_TDIE | VDMA_MR_CHAIN);
320 viafb_mmio_write(VDMA_DPRL0, descr_handle | VIAFB_DMA_MAGIC);
321 viafb_mmio_write(VDMA_DPRH0,
322 (((u64)descr_handle >> 32) & 0x0fff) | 0xf0000);
323 (void) viafb_mmio_read(VDMA_CSR0);
324 viafb_mmio_write(VDMA_CSR0, VDMA_C_ENABLE|VDMA_C_START);
325 spin_unlock_irqrestore(&global_dev.reg_lock, flags);
326 /*
327 * Now we just wait until the interrupt handler says
328 * we're done. Except that, actually, we need to wait a little
329 * longer: the interrupts seem to jump the gun a little and we
330 * get corrupted frames sometimes.
331 */
332 wait_for_completion_timeout(&viafb_dma_completion, 1);
333 msleep(1);
334 if ((viafb_mmio_read(VDMA_CSR0)&VDMA_C_DONE) == 0)
335 printk(KERN_ERR "VIA DMA timeout!\n");
336 /*
337 * Clean up and we're done.
338 */
339 viafb_mmio_write(VDMA_CSR0, VDMA_C_DONE);
340 viafb_mmio_write(VDMA_MR0, 0); /* Reset int enable */
341 mutex_unlock(&viafb_dma_lock);
342 dma_free_coherent(&global_dev.pdev->dev,
343 nsg*sizeof(struct viafb_vx855_dma_descr), descrpages,
344 descr_handle);
345 return 0;
346}
347EXPORT_SYMBOL_GPL(viafb_dma_copy_out_sg);
348#endif /* CONFIG_VIDEO_VIA_CAMERA */
349
350/* ---------------------------------------------------------------------- */
351/*
352 * Figure out how big our framebuffer memory is. Kind of ugly,
353 * but evidently we can't trust the information found in the
354 * fbdev configuration area.
355 */
356static u16 via_function3[] = {
357 CLE266_FUNCTION3, KM400_FUNCTION3, CN400_FUNCTION3, CN700_FUNCTION3,
358 CX700_FUNCTION3, KM800_FUNCTION3, KM890_FUNCTION3, P4M890_FUNCTION3,
359 P4M900_FUNCTION3, VX800_FUNCTION3, VX855_FUNCTION3, VX900_FUNCTION3,
360};
361
362/* Get the BIOS-configured framebuffer size from PCI configuration space
363 * of function 3 in the respective chipset */
364static int viafb_get_fb_size_from_pci(int chip_type)
365{
366 int i;
367 u8 offset = 0;
368 u32 FBSize;
369 u32 VideoMemSize;
370
371 /* search for the "FUNCTION3" device in this chipset */
372 for (i = 0; i < ARRAY_SIZE(via_function3); i++) {
373 struct pci_dev *pdev;
374
375 pdev = pci_get_device(PCI_VENDOR_ID_VIA, via_function3[i],
376 NULL);
377 if (!pdev)
378 continue;
379
380 DEBUG_MSG(KERN_INFO "Device ID = %x\n", pdev->device);
381
382 switch (pdev->device) {
383 case CLE266_FUNCTION3:
384 case KM400_FUNCTION3:
385 offset = 0xE0;
386 break;
387 case CN400_FUNCTION3:
388 case CN700_FUNCTION3:
389 case CX700_FUNCTION3:
390 case KM800_FUNCTION3:
391 case KM890_FUNCTION3:
392 case P4M890_FUNCTION3:
393 case P4M900_FUNCTION3:
394 case VX800_FUNCTION3:
395 case VX855_FUNCTION3:
396 case VX900_FUNCTION3:
397 /*case CN750_FUNCTION3: */
398 offset = 0xA0;
399 break;
400 }
401
402 if (!offset)
403 break;
404
405 pci_read_config_dword(pdev, offset, &FBSize);
406 pci_dev_put(pdev);
407 }
408
409 if (!offset) {
410 printk(KERN_ERR "cannot determine framebuffer size\n");
411 return -EIO;
412 }
413
414 FBSize = FBSize & 0x00007000;
415 DEBUG_MSG(KERN_INFO "FB Size = %x\n", FBSize);
416
417 if (chip_type < UNICHROME_CX700) {
418 switch (FBSize) {
419 case 0x00004000:
420 VideoMemSize = (16 << 20); /*16M */
421 break;
422
423 case 0x00005000:
424 VideoMemSize = (32 << 20); /*32M */
425 break;
426
427 case 0x00006000:
428 VideoMemSize = (64 << 20); /*64M */
429 break;
430
431 default:
432 VideoMemSize = (32 << 20); /*32M */
433 break;
434 }
435 } else {
436 switch (FBSize) {
437 case 0x00001000:
438 VideoMemSize = (8 << 20); /*8M */
439 break;
440
441 case 0x00002000:
442 VideoMemSize = (16 << 20); /*16M */
443 break;
444
445 case 0x00003000:
446 VideoMemSize = (32 << 20); /*32M */
447 break;
448
449 case 0x00004000:
450 VideoMemSize = (64 << 20); /*64M */
451 break;
452
453 case 0x00005000:
454 VideoMemSize = (128 << 20); /*128M */
455 break;
456
457 case 0x00006000:
458 VideoMemSize = (256 << 20); /*256M */
459 break;
460
461 case 0x00007000: /* Only on VX855/875 */
462 VideoMemSize = (512 << 20); /*512M */
463 break;
464
465 default:
466 VideoMemSize = (32 << 20); /*32M */
467 break;
468 }
469 }
470
471 return VideoMemSize;
472}
473
474
475/*
476 * Figure out and map our MMIO regions.
477 */
478static int via_pci_setup_mmio(struct viafb_dev *vdev)
479{
480 int ret;
481 /*
482 * Hook up to the device registers. Note that we soldier
483 * on if it fails; the framebuffer can operate (without
484 * acceleration) without this region.
485 */
486 vdev->engine_start = pci_resource_start(vdev->pdev, 1);
487 vdev->engine_len = pci_resource_len(vdev->pdev, 1);
488 vdev->engine_mmio = ioremap_nocache(vdev->engine_start,
489 vdev->engine_len);
490 if (vdev->engine_mmio == NULL)
491 dev_err(&vdev->pdev->dev,
492 "Unable to map engine MMIO; operation will be "
493 "slow and crippled.\n");
494 /*
495 * Map in framebuffer memory. For now, failure here is
496 * fatal. Unfortunately, in the absence of significant
497 * vmalloc space, failure here is also entirely plausible.
498 * Eventually we want to move away from mapping this
499 * entire region.
500 */
501 if (vdev->chip_type == UNICHROME_VX900)
502 vdev->fbmem_start = pci_resource_start(vdev->pdev, 2);
503 else
504 vdev->fbmem_start = pci_resource_start(vdev->pdev, 0);
505 ret = vdev->fbmem_len = viafb_get_fb_size_from_pci(vdev->chip_type);
506 if (ret < 0)
507 goto out_unmap;
508
509 /* try to map less memory on failure, 8 MB should be still enough */
510 for (; vdev->fbmem_len >= 8 << 20; vdev->fbmem_len /= 2) {
511 vdev->fbmem = ioremap_wc(vdev->fbmem_start, vdev->fbmem_len);
512 if (vdev->fbmem)
513 break;
514 }
515
516 if (vdev->fbmem == NULL) {
517 ret = -ENOMEM;
518 goto out_unmap;
519 }
520 return 0;
521out_unmap:
522 iounmap(vdev->engine_mmio);
523 return ret;
524}
525
526static void via_pci_teardown_mmio(struct viafb_dev *vdev)
527{
528 iounmap(vdev->fbmem);
529 iounmap(vdev->engine_mmio);
530}
531
532/*
533 * Create our subsidiary devices.
534 */
535static struct viafb_subdev_info {
536 char *name;
537 struct platform_device *platdev;
538} viafb_subdevs[] = {
539 {
540 .name = "viafb-gpio",
541 },
542 {
543 .name = "viafb-i2c",
544 },
545#if IS_ENABLED(CONFIG_VIDEO_VIA_CAMERA)
546 {
547 .name = "viafb-camera",
548 },
549#endif
550};
551#define N_SUBDEVS ARRAY_SIZE(viafb_subdevs)
552
553static int via_create_subdev(struct viafb_dev *vdev,
554 struct viafb_subdev_info *info)
555{
556 int ret;
557
558 info->platdev = platform_device_alloc(info->name, -1);
559 if (!info->platdev) {
560 dev_err(&vdev->pdev->dev, "Unable to allocate pdev %s\n",
561 info->name);
562 return -ENOMEM;
563 }
564 info->platdev->dev.parent = &vdev->pdev->dev;
565 info->platdev->dev.platform_data = vdev;
566 ret = platform_device_add(info->platdev);
567 if (ret) {
568 dev_err(&vdev->pdev->dev, "Unable to add pdev %s\n",
569 info->name);
570 platform_device_put(info->platdev);
571 info->platdev = NULL;
572 }
573 return ret;
574}
575
576static int via_setup_subdevs(struct viafb_dev *vdev)
577{
578 int i;
579
580 /*
581 * Ignore return values. Even if some of the devices
582 * fail to be created, we'll still be able to use some
583 * of the rest.
584 */
585 for (i = 0; i < N_SUBDEVS; i++)
586 via_create_subdev(vdev, viafb_subdevs + i);
587 return 0;
588}
589
590static void via_teardown_subdevs(void)
591{
592 int i;
593
594 for (i = 0; i < N_SUBDEVS; i++)
595 if (viafb_subdevs[i].platdev) {
596 viafb_subdevs[i].platdev->dev.platform_data = NULL;
597 platform_device_unregister(viafb_subdevs[i].platdev);
598 }
599}
600
601/*
602 * Power management functions
603 */
604#ifdef CONFIG_PM
605static LIST_HEAD(viafb_pm_hooks);
606static DEFINE_MUTEX(viafb_pm_hooks_lock);
607
608void viafb_pm_register(struct viafb_pm_hooks *hooks)
609{
610 INIT_LIST_HEAD(&hooks->list);
611
612 mutex_lock(&viafb_pm_hooks_lock);
613 list_add_tail(&hooks->list, &viafb_pm_hooks);
614 mutex_unlock(&viafb_pm_hooks_lock);
615}
616EXPORT_SYMBOL_GPL(viafb_pm_register);
617
618void viafb_pm_unregister(struct viafb_pm_hooks *hooks)
619{
620 mutex_lock(&viafb_pm_hooks_lock);
621 list_del(&hooks->list);
622 mutex_unlock(&viafb_pm_hooks_lock);
623}
624EXPORT_SYMBOL_GPL(viafb_pm_unregister);
625
626static int via_suspend(struct pci_dev *pdev, pm_message_t state)
627{
628 struct viafb_pm_hooks *hooks;
629
630 if (state.event != PM_EVENT_SUSPEND)
631 return 0;
632 /*
633 * "I've occasionally hit a few drivers that caused suspend
634 * failures, and each and every time it was a driver bug, and
635 * the right thing to do was to just ignore the error and suspend
636 * anyway - returning an error code and trying to undo the suspend
637 * is not what anybody ever really wants, even if our model
638 *_allows_ for it."
639 * -- Linus Torvalds, Dec. 7, 2009
640 */
641 mutex_lock(&viafb_pm_hooks_lock);
642 list_for_each_entry_reverse(hooks, &viafb_pm_hooks, list)
643 hooks->suspend(hooks->private);
644 mutex_unlock(&viafb_pm_hooks_lock);
645
646 pci_save_state(pdev);
647 pci_disable_device(pdev);
648 pci_set_power_state(pdev, pci_choose_state(pdev, state));
649 return 0;
650}
651
652static int via_resume(struct pci_dev *pdev)
653{
654 struct viafb_pm_hooks *hooks;
655
656 /* Get the bus side powered up */
657 pci_set_power_state(pdev, PCI_D0);
658 pci_restore_state(pdev);
659 if (pci_enable_device(pdev))
660 return 0;
661
662 pci_set_master(pdev);
663
664 /* Now bring back any subdevs */
665 mutex_lock(&viafb_pm_hooks_lock);
666 list_for_each_entry(hooks, &viafb_pm_hooks, list)
667 hooks->resume(hooks->private);
668 mutex_unlock(&viafb_pm_hooks_lock);
669
670 return 0;
671}
672#endif /* CONFIG_PM */
673
674static int via_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
675{
676 int ret;
677
678 ret = pci_enable_device(pdev);
679 if (ret)
680 return ret;
681
682 /*
683 * Global device initialization.
684 */
685 memset(&global_dev, 0, sizeof(global_dev));
686 global_dev.pdev = pdev;
687 global_dev.chip_type = ent->driver_data;
688 global_dev.port_cfg = adap_configs;
689 if (machine_is_olpc())
690 global_dev.port_cfg = olpc_adap_configs;
691
692 spin_lock_init(&global_dev.reg_lock);
693 ret = via_pci_setup_mmio(&global_dev);
694 if (ret)
695 goto out_disable;
696 /*
697 * Set up interrupts and create our subdevices. Continue even if
698 * some things fail.
699 */
700 viafb_int_init();
701 via_setup_subdevs(&global_dev);
702 /*
703 * Set up the framebuffer device
704 */
705 ret = via_fb_pci_probe(&global_dev);
706 if (ret)
707 goto out_subdevs;
708 return 0;
709
710out_subdevs:
711 via_teardown_subdevs();
712 via_pci_teardown_mmio(&global_dev);
713out_disable:
714 pci_disable_device(pdev);
715 return ret;
716}
717
718static void via_pci_remove(struct pci_dev *pdev)
719{
720 via_teardown_subdevs();
721 via_fb_pci_remove(pdev);
722 via_pci_teardown_mmio(&global_dev);
723 pci_disable_device(pdev);
724}
725
726
727static struct pci_device_id via_pci_table[] = {
728 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CLE266_DID),
729 .driver_data = UNICHROME_CLE266 },
730 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K400_DID),
731 .driver_data = UNICHROME_K400 },
732 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K800_DID),
733 .driver_data = UNICHROME_K800 },
734 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_PM800_DID),
735 .driver_data = UNICHROME_PM800 },
736 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CN700_DID),
737 .driver_data = UNICHROME_CN700 },
738 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CX700_DID),
739 .driver_data = UNICHROME_CX700 },
740 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CN750_DID),
741 .driver_data = UNICHROME_CN750 },
742 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K8M890_DID),
743 .driver_data = UNICHROME_K8M890 },
744 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_P4M890_DID),
745 .driver_data = UNICHROME_P4M890 },
746 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_P4M900_DID),
747 .driver_data = UNICHROME_P4M900 },
748 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_VX800_DID),
749 .driver_data = UNICHROME_VX800 },
750 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_VX855_DID),
751 .driver_data = UNICHROME_VX855 },
752 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_VX900_DID),
753 .driver_data = UNICHROME_VX900 },
754 { }
755};
756MODULE_DEVICE_TABLE(pci, via_pci_table);
757
758static struct pci_driver via_driver = {
759 .name = "viafb",
760 .id_table = via_pci_table,
761 .probe = via_pci_probe,
762 .remove = via_pci_remove,
763#ifdef CONFIG_PM
764 .suspend = via_suspend,
765 .resume = via_resume,
766#endif
767};
768
769static int __init via_core_init(void)
770{
771 int ret;
772
773 ret = viafb_init();
774 if (ret)
775 return ret;
776 viafb_i2c_init();
777 viafb_gpio_init();
778 return pci_register_driver(&via_driver);
779}
780
781static void __exit via_core_exit(void)
782{
783 pci_unregister_driver(&via_driver);
784 viafb_gpio_exit();
785 viafb_i2c_exit();
786 viafb_exit();
787}
788
789module_init(via_core_init);
790module_exit(via_core_exit);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved.
4 * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
5 * Copyright 2009 Jonathan Corbet <corbet@lwn.net>
6 */
7
8/*
9 * Core code for the Via multifunction framebuffer device.
10 */
11#include <linux/aperture.h>
12#include <linux/via-core.h>
13#include <linux/via_i2c.h>
14#include "via-gpio.h"
15#include "global.h"
16
17#include <linux/module.h>
18#include <linux/interrupt.h>
19#include <linux/platform_device.h>
20#include <linux/list.h>
21#include <linux/pm.h>
22
23/*
24 * The default port config.
25 */
26static struct via_port_cfg adap_configs[] = {
27 [VIA_PORT_26] = { VIA_PORT_I2C, VIA_MODE_I2C, VIASR, 0x26 },
28 [VIA_PORT_31] = { VIA_PORT_I2C, VIA_MODE_I2C, VIASR, 0x31 },
29 [VIA_PORT_25] = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x25 },
30 [VIA_PORT_2C] = { VIA_PORT_GPIO, VIA_MODE_I2C, VIASR, 0x2c },
31 [VIA_PORT_3D] = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x3d },
32 { 0, 0, 0, 0 }
33};
34
35/*
36 * The OLPC XO-1.5 puts the camera power and reset lines onto
37 * GPIO 2C.
38 */
39static struct via_port_cfg olpc_adap_configs[] = {
40 [VIA_PORT_26] = { VIA_PORT_I2C, VIA_MODE_I2C, VIASR, 0x26 },
41 [VIA_PORT_31] = { VIA_PORT_I2C, VIA_MODE_I2C, VIASR, 0x31 },
42 [VIA_PORT_25] = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x25 },
43 [VIA_PORT_2C] = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x2c },
44 [VIA_PORT_3D] = { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x3d },
45 { 0, 0, 0, 0 }
46};
47
48/*
49 * We currently only support one viafb device (will there ever be
50 * more than one?), so just declare it globally here.
51 */
52static struct viafb_dev global_dev;
53
54
55/*
56 * Basic register access; spinlock required.
57 */
58static inline void viafb_mmio_write(int reg, u32 v)
59{
60 iowrite32(v, global_dev.engine_mmio + reg);
61}
62
63static inline int viafb_mmio_read(int reg)
64{
65 return ioread32(global_dev.engine_mmio + reg);
66}
67
68/* ---------------------------------------------------------------------- */
69/*
70 * Interrupt management. We have a single IRQ line for a lot of
71 * different functions, so we need to share it. The design here
72 * is that we don't want to reimplement the shared IRQ code here;
73 * we also want to avoid having contention for a single handler thread.
74 * So each subdev driver which needs interrupts just requests
75 * them directly from the kernel. We just have what's needed for
76 * overall access to the interrupt control register.
77 */
78
79/*
80 * Which interrupts are enabled now?
81 */
82static u32 viafb_enabled_ints;
83
84static void viafb_int_init(void)
85{
86 viafb_enabled_ints = 0;
87
88 viafb_mmio_write(VDE_INTERRUPT, 0);
89}
90
91/*
92 * Allow subdevs to ask for specific interrupts to be enabled. These
93 * functions must be called with reg_lock held
94 */
95void viafb_irq_enable(u32 mask)
96{
97 viafb_enabled_ints |= mask;
98 viafb_mmio_write(VDE_INTERRUPT, viafb_enabled_ints | VDE_I_ENABLE);
99}
100EXPORT_SYMBOL_GPL(viafb_irq_enable);
101
102void viafb_irq_disable(u32 mask)
103{
104 viafb_enabled_ints &= ~mask;
105 if (viafb_enabled_ints == 0)
106 viafb_mmio_write(VDE_INTERRUPT, 0); /* Disable entirely */
107 else
108 viafb_mmio_write(VDE_INTERRUPT,
109 viafb_enabled_ints | VDE_I_ENABLE);
110}
111EXPORT_SYMBOL_GPL(viafb_irq_disable);
112
113/* ---------------------------------------------------------------------- */
114/*
115 * Currently, the camera driver is the only user of the DMA code, so we
116 * only compile it in if the camera driver is being built. Chances are,
117 * most viafb systems will not need to have this extra code for a while.
118 * As soon as another user comes long, the ifdef can be removed.
119 */
120#if IS_ENABLED(CONFIG_VIDEO_VIA_CAMERA)
121/*
122 * Access to the DMA engine. This currently provides what the camera
123 * driver needs (i.e. outgoing only) but is easily expandable if need
124 * be.
125 */
126
127/*
128 * There are four DMA channels in the vx855. For now, we only
129 * use one of them, though. Most of the time, the DMA channel
130 * will be idle, so we keep the IRQ handler unregistered except
131 * when some subsystem has indicated an interest.
132 */
133static int viafb_dma_users;
134static DECLARE_COMPLETION(viafb_dma_completion);
135/*
136 * This mutex protects viafb_dma_users and our global interrupt
137 * registration state; it also serializes access to the DMA
138 * engine.
139 */
140static DEFINE_MUTEX(viafb_dma_lock);
141
142/*
143 * The VX855 DMA descriptor (used for s/g transfers) looks
144 * like this.
145 */
146struct viafb_vx855_dma_descr {
147 u32 addr_low; /* Low part of phys addr */
148 u32 addr_high; /* High 12 bits of addr */
149 u32 fb_offset; /* Offset into FB memory */
150 u32 seg_size; /* Size, 16-byte units */
151 u32 tile_mode; /* "tile mode" setting */
152 u32 next_desc_low; /* Next descriptor addr */
153 u32 next_desc_high;
154 u32 pad; /* Fill out to 64 bytes */
155};
156
157/*
158 * Flags added to the "next descriptor low" pointers
159 */
160#define VIAFB_DMA_MAGIC 0x01 /* ??? Just has to be there */
161#define VIAFB_DMA_FINAL_SEGMENT 0x02 /* Final segment */
162
163/*
164 * The completion IRQ handler.
165 */
166static irqreturn_t viafb_dma_irq(int irq, void *data)
167{
168 int csr;
169 irqreturn_t ret = IRQ_NONE;
170
171 spin_lock(&global_dev.reg_lock);
172 csr = viafb_mmio_read(VDMA_CSR0);
173 if (csr & VDMA_C_DONE) {
174 viafb_mmio_write(VDMA_CSR0, VDMA_C_DONE);
175 complete(&viafb_dma_completion);
176 ret = IRQ_HANDLED;
177 }
178 spin_unlock(&global_dev.reg_lock);
179 return ret;
180}
181
182/*
183 * Indicate a need for DMA functionality.
184 */
185int viafb_request_dma(void)
186{
187 int ret = 0;
188
189 /*
190 * Only VX855 is supported currently.
191 */
192 if (global_dev.chip_type != UNICHROME_VX855)
193 return -ENODEV;
194 /*
195 * Note the new user and set up our interrupt handler
196 * if need be.
197 */
198 mutex_lock(&viafb_dma_lock);
199 viafb_dma_users++;
200 if (viafb_dma_users == 1) {
201 ret = request_irq(global_dev.pdev->irq, viafb_dma_irq,
202 IRQF_SHARED, "via-dma", &viafb_dma_users);
203 if (ret)
204 viafb_dma_users--;
205 else
206 viafb_irq_enable(VDE_I_DMA0TDEN);
207 }
208 mutex_unlock(&viafb_dma_lock);
209 return ret;
210}
211EXPORT_SYMBOL_GPL(viafb_request_dma);
212
213void viafb_release_dma(void)
214{
215 mutex_lock(&viafb_dma_lock);
216 viafb_dma_users--;
217 if (viafb_dma_users == 0) {
218 viafb_irq_disable(VDE_I_DMA0TDEN);
219 free_irq(global_dev.pdev->irq, &viafb_dma_users);
220 }
221 mutex_unlock(&viafb_dma_lock);
222}
223EXPORT_SYMBOL_GPL(viafb_release_dma);
224
225/*
226 * Do a scatter/gather DMA copy from FB memory. You must have done
227 * a successful call to viafb_request_dma() first.
228 */
229int viafb_dma_copy_out_sg(unsigned int offset, struct scatterlist *sg, int nsg)
230{
231 struct viafb_vx855_dma_descr *descr;
232 void *descrpages;
233 dma_addr_t descr_handle;
234 unsigned long flags;
235 int i;
236 struct scatterlist *sgentry;
237 dma_addr_t nextdesc;
238
239 /*
240 * Get a place to put the descriptors.
241 */
242 descrpages = dma_alloc_coherent(&global_dev.pdev->dev,
243 nsg*sizeof(struct viafb_vx855_dma_descr),
244 &descr_handle, GFP_KERNEL);
245 if (descrpages == NULL) {
246 dev_err(&global_dev.pdev->dev, "Unable to get descr page.\n");
247 return -ENOMEM;
248 }
249 mutex_lock(&viafb_dma_lock);
250 /*
251 * Fill them in.
252 */
253 descr = descrpages;
254 nextdesc = descr_handle + sizeof(struct viafb_vx855_dma_descr);
255 for_each_sg(sg, sgentry, nsg, i) {
256 dma_addr_t paddr = sg_dma_address(sgentry);
257 descr->addr_low = paddr & 0xfffffff0;
258 descr->addr_high = ((u64) paddr >> 32) & 0x0fff;
259 descr->fb_offset = offset;
260 descr->seg_size = sg_dma_len(sgentry) >> 4;
261 descr->tile_mode = 0;
262 descr->next_desc_low = (nextdesc&0xfffffff0) | VIAFB_DMA_MAGIC;
263 descr->next_desc_high = ((u64) nextdesc >> 32) & 0x0fff;
264 descr->pad = 0xffffffff; /* VIA driver does this */
265 offset += sg_dma_len(sgentry);
266 nextdesc += sizeof(struct viafb_vx855_dma_descr);
267 descr++;
268 }
269 descr[-1].next_desc_low = VIAFB_DMA_FINAL_SEGMENT|VIAFB_DMA_MAGIC;
270 /*
271 * Program the engine.
272 */
273 spin_lock_irqsave(&global_dev.reg_lock, flags);
274 init_completion(&viafb_dma_completion);
275 viafb_mmio_write(VDMA_DQWCR0, 0);
276 viafb_mmio_write(VDMA_CSR0, VDMA_C_ENABLE|VDMA_C_DONE);
277 viafb_mmio_write(VDMA_MR0, VDMA_MR_TDIE | VDMA_MR_CHAIN);
278 viafb_mmio_write(VDMA_DPRL0, descr_handle | VIAFB_DMA_MAGIC);
279 viafb_mmio_write(VDMA_DPRH0,
280 (((u64)descr_handle >> 32) & 0x0fff) | 0xf0000);
281 (void) viafb_mmio_read(VDMA_CSR0);
282 viafb_mmio_write(VDMA_CSR0, VDMA_C_ENABLE|VDMA_C_START);
283 spin_unlock_irqrestore(&global_dev.reg_lock, flags);
284 /*
285 * Now we just wait until the interrupt handler says
286 * we're done. Except that, actually, we need to wait a little
287 * longer: the interrupts seem to jump the gun a little and we
288 * get corrupted frames sometimes.
289 */
290 wait_for_completion_timeout(&viafb_dma_completion, 1);
291 msleep(1);
292 if ((viafb_mmio_read(VDMA_CSR0)&VDMA_C_DONE) == 0)
293 printk(KERN_ERR "VIA DMA timeout!\n");
294 /*
295 * Clean up and we're done.
296 */
297 viafb_mmio_write(VDMA_CSR0, VDMA_C_DONE);
298 viafb_mmio_write(VDMA_MR0, 0); /* Reset int enable */
299 mutex_unlock(&viafb_dma_lock);
300 dma_free_coherent(&global_dev.pdev->dev,
301 nsg*sizeof(struct viafb_vx855_dma_descr), descrpages,
302 descr_handle);
303 return 0;
304}
305EXPORT_SYMBOL_GPL(viafb_dma_copy_out_sg);
306#endif /* CONFIG_VIDEO_VIA_CAMERA */
307
308/* ---------------------------------------------------------------------- */
309/*
310 * Figure out how big our framebuffer memory is. Kind of ugly,
311 * but evidently we can't trust the information found in the
312 * fbdev configuration area.
313 */
314static u16 via_function3[] = {
315 CLE266_FUNCTION3, KM400_FUNCTION3, CN400_FUNCTION3, CN700_FUNCTION3,
316 CX700_FUNCTION3, KM800_FUNCTION3, KM890_FUNCTION3, P4M890_FUNCTION3,
317 P4M900_FUNCTION3, VX800_FUNCTION3, VX855_FUNCTION3, VX900_FUNCTION3,
318};
319
320/* Get the BIOS-configured framebuffer size from PCI configuration space
321 * of function 3 in the respective chipset */
322static int viafb_get_fb_size_from_pci(int chip_type)
323{
324 int i;
325 u8 offset = 0;
326 u32 FBSize;
327 u32 VideoMemSize;
328
329 /* search for the "FUNCTION3" device in this chipset */
330 for (i = 0; i < ARRAY_SIZE(via_function3); i++) {
331 struct pci_dev *pdev;
332
333 pdev = pci_get_device(PCI_VENDOR_ID_VIA, via_function3[i],
334 NULL);
335 if (!pdev)
336 continue;
337
338 DEBUG_MSG(KERN_INFO "Device ID = %x\n", pdev->device);
339
340 switch (pdev->device) {
341 case CLE266_FUNCTION3:
342 case KM400_FUNCTION3:
343 offset = 0xE0;
344 break;
345 case CN400_FUNCTION3:
346 case CN700_FUNCTION3:
347 case CX700_FUNCTION3:
348 case KM800_FUNCTION3:
349 case KM890_FUNCTION3:
350 case P4M890_FUNCTION3:
351 case P4M900_FUNCTION3:
352 case VX800_FUNCTION3:
353 case VX855_FUNCTION3:
354 case VX900_FUNCTION3:
355 /*case CN750_FUNCTION3: */
356 offset = 0xA0;
357 break;
358 }
359
360 if (!offset)
361 break;
362
363 pci_read_config_dword(pdev, offset, &FBSize);
364 pci_dev_put(pdev);
365 }
366
367 if (!offset) {
368 printk(KERN_ERR "cannot determine framebuffer size\n");
369 return -EIO;
370 }
371
372 FBSize = FBSize & 0x00007000;
373 DEBUG_MSG(KERN_INFO "FB Size = %x\n", FBSize);
374
375 if (chip_type < UNICHROME_CX700) {
376 switch (FBSize) {
377 case 0x00004000:
378 VideoMemSize = (16 << 20); /*16M */
379 break;
380
381 case 0x00005000:
382 VideoMemSize = (32 << 20); /*32M */
383 break;
384
385 case 0x00006000:
386 VideoMemSize = (64 << 20); /*64M */
387 break;
388
389 default:
390 VideoMemSize = (32 << 20); /*32M */
391 break;
392 }
393 } else {
394 switch (FBSize) {
395 case 0x00001000:
396 VideoMemSize = (8 << 20); /*8M */
397 break;
398
399 case 0x00002000:
400 VideoMemSize = (16 << 20); /*16M */
401 break;
402
403 case 0x00003000:
404 VideoMemSize = (32 << 20); /*32M */
405 break;
406
407 case 0x00004000:
408 VideoMemSize = (64 << 20); /*64M */
409 break;
410
411 case 0x00005000:
412 VideoMemSize = (128 << 20); /*128M */
413 break;
414
415 case 0x00006000:
416 VideoMemSize = (256 << 20); /*256M */
417 break;
418
419 case 0x00007000: /* Only on VX855/875 */
420 VideoMemSize = (512 << 20); /*512M */
421 break;
422
423 default:
424 VideoMemSize = (32 << 20); /*32M */
425 break;
426 }
427 }
428
429 return VideoMemSize;
430}
431
432
433/*
434 * Figure out and map our MMIO regions.
435 */
436static int via_pci_setup_mmio(struct viafb_dev *vdev)
437{
438 int ret;
439 /*
440 * Hook up to the device registers. Note that we soldier
441 * on if it fails; the framebuffer can operate (without
442 * acceleration) without this region.
443 */
444 vdev->engine_start = pci_resource_start(vdev->pdev, 1);
445 vdev->engine_len = pci_resource_len(vdev->pdev, 1);
446 vdev->engine_mmio = ioremap(vdev->engine_start,
447 vdev->engine_len);
448 if (vdev->engine_mmio == NULL)
449 dev_err(&vdev->pdev->dev,
450 "Unable to map engine MMIO; operation will be "
451 "slow and crippled.\n");
452 /*
453 * Map in framebuffer memory. For now, failure here is
454 * fatal. Unfortunately, in the absence of significant
455 * vmalloc space, failure here is also entirely plausible.
456 * Eventually we want to move away from mapping this
457 * entire region.
458 */
459 if (vdev->chip_type == UNICHROME_VX900)
460 vdev->fbmem_start = pci_resource_start(vdev->pdev, 2);
461 else
462 vdev->fbmem_start = pci_resource_start(vdev->pdev, 0);
463 ret = vdev->fbmem_len = viafb_get_fb_size_from_pci(vdev->chip_type);
464 if (ret < 0)
465 goto out_unmap;
466
467 /* try to map less memory on failure, 8 MB should be still enough */
468 for (; vdev->fbmem_len >= 8 << 20; vdev->fbmem_len /= 2) {
469 vdev->fbmem = ioremap_wc(vdev->fbmem_start, vdev->fbmem_len);
470 if (vdev->fbmem)
471 break;
472 }
473
474 if (vdev->fbmem == NULL) {
475 ret = -ENOMEM;
476 goto out_unmap;
477 }
478 return 0;
479out_unmap:
480 iounmap(vdev->engine_mmio);
481 return ret;
482}
483
484static void via_pci_teardown_mmio(struct viafb_dev *vdev)
485{
486 iounmap(vdev->fbmem);
487 iounmap(vdev->engine_mmio);
488}
489
490/*
491 * Create our subsidiary devices.
492 */
493static struct viafb_subdev_info {
494 char *name;
495 struct platform_device *platdev;
496} viafb_subdevs[] = {
497 {
498 .name = "viafb-gpio",
499 },
500 {
501 .name = "viafb-i2c",
502 },
503#if IS_ENABLED(CONFIG_VIDEO_VIA_CAMERA)
504 {
505 .name = "viafb-camera",
506 },
507#endif
508};
509#define N_SUBDEVS ARRAY_SIZE(viafb_subdevs)
510
511static int via_create_subdev(struct viafb_dev *vdev,
512 struct viafb_subdev_info *info)
513{
514 int ret;
515
516 info->platdev = platform_device_alloc(info->name, -1);
517 if (!info->platdev) {
518 dev_err(&vdev->pdev->dev, "Unable to allocate pdev %s\n",
519 info->name);
520 return -ENOMEM;
521 }
522 info->platdev->dev.parent = &vdev->pdev->dev;
523 info->platdev->dev.platform_data = vdev;
524 ret = platform_device_add(info->platdev);
525 if (ret) {
526 dev_err(&vdev->pdev->dev, "Unable to add pdev %s\n",
527 info->name);
528 platform_device_put(info->platdev);
529 info->platdev = NULL;
530 }
531 return ret;
532}
533
534static int via_setup_subdevs(struct viafb_dev *vdev)
535{
536 int i;
537
538 /*
539 * Ignore return values. Even if some of the devices
540 * fail to be created, we'll still be able to use some
541 * of the rest.
542 */
543 for (i = 0; i < N_SUBDEVS; i++)
544 via_create_subdev(vdev, viafb_subdevs + i);
545 return 0;
546}
547
548static void via_teardown_subdevs(void)
549{
550 int i;
551
552 for (i = 0; i < N_SUBDEVS; i++)
553 if (viafb_subdevs[i].platdev) {
554 viafb_subdevs[i].platdev->dev.platform_data = NULL;
555 platform_device_unregister(viafb_subdevs[i].platdev);
556 }
557}
558
559/*
560 * Power management functions
561 */
562static __maybe_unused LIST_HEAD(viafb_pm_hooks);
563static __maybe_unused DEFINE_MUTEX(viafb_pm_hooks_lock);
564
565void viafb_pm_register(struct viafb_pm_hooks *hooks)
566{
567 INIT_LIST_HEAD(&hooks->list);
568
569 mutex_lock(&viafb_pm_hooks_lock);
570 list_add_tail(&hooks->list, &viafb_pm_hooks);
571 mutex_unlock(&viafb_pm_hooks_lock);
572}
573EXPORT_SYMBOL_GPL(viafb_pm_register);
574
575void viafb_pm_unregister(struct viafb_pm_hooks *hooks)
576{
577 mutex_lock(&viafb_pm_hooks_lock);
578 list_del(&hooks->list);
579 mutex_unlock(&viafb_pm_hooks_lock);
580}
581EXPORT_SYMBOL_GPL(viafb_pm_unregister);
582
583static int __maybe_unused via_suspend(struct device *dev)
584{
585 struct viafb_pm_hooks *hooks;
586
587 /*
588 * "I've occasionally hit a few drivers that caused suspend
589 * failures, and each and every time it was a driver bug, and
590 * the right thing to do was to just ignore the error and suspend
591 * anyway - returning an error code and trying to undo the suspend
592 * is not what anybody ever really wants, even if our model
593 *_allows_ for it."
594 * -- Linus Torvalds, Dec. 7, 2009
595 */
596 mutex_lock(&viafb_pm_hooks_lock);
597 list_for_each_entry_reverse(hooks, &viafb_pm_hooks, list)
598 hooks->suspend(hooks->private);
599 mutex_unlock(&viafb_pm_hooks_lock);
600
601 return 0;
602}
603
604static int __maybe_unused via_resume(struct device *dev)
605{
606 struct viafb_pm_hooks *hooks;
607
608 /* Now bring back any subdevs */
609 mutex_lock(&viafb_pm_hooks_lock);
610 list_for_each_entry(hooks, &viafb_pm_hooks, list)
611 hooks->resume(hooks->private);
612 mutex_unlock(&viafb_pm_hooks_lock);
613
614 return 0;
615}
616
617static int via_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
618{
619 int ret;
620
621 ret = aperture_remove_conflicting_pci_devices(pdev, "viafb");
622 if (ret)
623 return ret;
624
625 ret = pci_enable_device(pdev);
626 if (ret)
627 return ret;
628
629 /*
630 * Global device initialization.
631 */
632 memset(&global_dev, 0, sizeof(global_dev));
633 global_dev.pdev = pdev;
634 global_dev.chip_type = ent->driver_data;
635 global_dev.port_cfg = adap_configs;
636 if (machine_is_olpc())
637 global_dev.port_cfg = olpc_adap_configs;
638
639 spin_lock_init(&global_dev.reg_lock);
640 ret = via_pci_setup_mmio(&global_dev);
641 if (ret)
642 goto out_disable;
643 /*
644 * Set up interrupts and create our subdevices. Continue even if
645 * some things fail.
646 */
647 viafb_int_init();
648 via_setup_subdevs(&global_dev);
649 /*
650 * Set up the framebuffer device
651 */
652 ret = via_fb_pci_probe(&global_dev);
653 if (ret)
654 goto out_subdevs;
655 return 0;
656
657out_subdevs:
658 via_teardown_subdevs();
659 via_pci_teardown_mmio(&global_dev);
660out_disable:
661 pci_disable_device(pdev);
662 return ret;
663}
664
665static void via_pci_remove(struct pci_dev *pdev)
666{
667 via_teardown_subdevs();
668 via_fb_pci_remove(pdev);
669 via_pci_teardown_mmio(&global_dev);
670 pci_disable_device(pdev);
671}
672
673
674static const struct pci_device_id via_pci_table[] = {
675 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CLE266_DID),
676 .driver_data = UNICHROME_CLE266 },
677 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K400_DID),
678 .driver_data = UNICHROME_K400 },
679 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K800_DID),
680 .driver_data = UNICHROME_K800 },
681 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_PM800_DID),
682 .driver_data = UNICHROME_PM800 },
683 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CN700_DID),
684 .driver_data = UNICHROME_CN700 },
685 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CX700_DID),
686 .driver_data = UNICHROME_CX700 },
687 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CN750_DID),
688 .driver_data = UNICHROME_CN750 },
689 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K8M890_DID),
690 .driver_data = UNICHROME_K8M890 },
691 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_P4M890_DID),
692 .driver_data = UNICHROME_P4M890 },
693 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_P4M900_DID),
694 .driver_data = UNICHROME_P4M900 },
695 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_VX800_DID),
696 .driver_data = UNICHROME_VX800 },
697 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_VX855_DID),
698 .driver_data = UNICHROME_VX855 },
699 { PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_VX900_DID),
700 .driver_data = UNICHROME_VX900 },
701 { }
702};
703MODULE_DEVICE_TABLE(pci, via_pci_table);
704
705static const struct dev_pm_ops via_pm_ops = {
706#ifdef CONFIG_PM_SLEEP
707 .suspend = via_suspend,
708 .resume = via_resume,
709 .freeze = NULL,
710 .thaw = via_resume,
711 .poweroff = NULL,
712 .restore = via_resume,
713#endif
714};
715
716static struct pci_driver via_driver = {
717 .name = "viafb",
718 .id_table = via_pci_table,
719 .probe = via_pci_probe,
720 .remove = via_pci_remove,
721 .driver.pm = &via_pm_ops,
722};
723
724static int __init via_core_init(void)
725{
726 int ret;
727
728 if (fb_modesetting_disabled("viafb"))
729 return -ENODEV;
730
731 ret = viafb_init();
732 if (ret)
733 return ret;
734 viafb_i2c_init();
735 viafb_gpio_init();
736 ret = pci_register_driver(&via_driver);
737 if (ret) {
738 viafb_gpio_exit();
739 viafb_i2c_exit();
740 return ret;
741 }
742
743 return 0;
744}
745
746static void __exit via_core_exit(void)
747{
748 pci_unregister_driver(&via_driver);
749 viafb_gpio_exit();
750 viafb_i2c_exit();
751 viafb_exit();
752}
753
754module_init(via_core_init);
755module_exit(via_core_exit);