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hc
2024-02-20 e636c8d336489bf3eed5878299e6cc045bbad077 
 kernel/arch/sparc/kernel/ioport.c
....@@ -38,7 +38,7 @@
3838 #include <linux/proc_fs.h>
3939 #include <linux/seq_file.h>
4040 #include <linux/scatterlist.h>
41
-#include <linux/dma-noncoherent.h>
41
+#include <linux/dma-map-ops.h>
4242 #include <linux/of_device.h>
4343 
4444 #include <asm/io.h>
....@@ -51,8 +51,6 @@
5151 #include <asm/iommu.h>
5252 #include <asm/io-unit.h>
5353 #include <asm/leon.h>
54
-
55
-const struct sparc32_dma_ops *sparc32_dma_ops;
5654 
5755 /* This function must make sure that caches and memory are coherent after DMA
5856  * On LEON systems without cache snooping it flushes the entire D-CACHE.
....@@ -247,6 +245,53 @@
247245 	release_resource(res);
248246 }
249247 
248
+unsigned long sparc_dma_alloc_resource(struct device *dev, size_t len)
249
+{
250
+	struct resource *res;
251
+
252
+	res = kzalloc(sizeof(*res), GFP_KERNEL);
253
+	if (!res)
254
+		return 0;
255
+	res->name = dev->of_node->full_name;
256
+
257
+	if (allocate_resource(&_sparc_dvma, res, len, _sparc_dvma.start,
258
+			      _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
259
+		printk("%s: cannot occupy 0x%zx", __func__, len);
260
+		kfree(res);
261
+		return 0;
262
+	}
263
+
264
+	return res->start;
265
+}
266
+
267
+bool sparc_dma_free_resource(void *cpu_addr, size_t size)
268
+{
269
+	unsigned long addr = (unsigned long)cpu_addr;
270
+	struct resource *res;
271
+
272
+	res = lookup_resource(&_sparc_dvma, addr);
273
+	if (!res) {
274
+		printk("%s: cannot free %p\n", __func__, cpu_addr);
275
+		return false;
276
+	}
277
+
278
+	if ((addr & (PAGE_SIZE - 1)) != 0) {
279
+		printk("%s: unaligned va %p\n", __func__, cpu_addr);
280
+		return false;
281
+	}
282
+
283
+	size = PAGE_ALIGN(size);
284
+	if (resource_size(res) != size) {
285
+		printk("%s: region 0x%lx asked 0x%zx\n",
286
+			__func__, (long)resource_size(res), size);
287
+		return false;
288
+	}
289
+
290
+	release_resource(res);
291
+	kfree(res);
292
+	return true;
293
+}
294
+
250295 #ifdef CONFIG_SBUS
251296 
252297 void sbus_set_sbus64(struct device *dev, int x)
....@@ -254,171 +299,6 @@
254299 	printk("sbus_set_sbus64: unsupported\n");
255300 }
256301 EXPORT_SYMBOL(sbus_set_sbus64);
257
-
258
-/*
259
- * Allocate a chunk of memory suitable for DMA.
260
- * Typically devices use them for control blocks.
261
- * CPU may access them without any explicit flushing.
262
- */
263
-static void *sbus_alloc_coherent(struct device *dev, size_t len,
264
-				 dma_addr_t *dma_addrp, gfp_t gfp,
265
-				 unsigned long attrs)
266
-{
267
-	struct platform_device *op = to_platform_device(dev);
268
-	unsigned long len_total = PAGE_ALIGN(len);
269
-	unsigned long va;
270
-	struct resource *res;
271
-	int order;
272
-
273
-	/* XXX why are some lengths signed, others unsigned? */
274
-	if (len <= 0) {
275
-		return NULL;
276
-	}
277
-	/* XXX So what is maxphys for us and how do drivers know it? */
278
-	if (len > 256*1024) {			/* __get_free_pages() limit */
279
-		return NULL;
280
-	}
281
-
282
-	order = get_order(len_total);
283
-	va = __get_free_pages(gfp, order);
284
-	if (va == 0)
285
-		goto err_nopages;
286
-
287
-	if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL)
288
-		goto err_nomem;
289
-
290
-	if (allocate_resource(&_sparc_dvma, res, len_total,
291
-	    _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
292
-		printk("sbus_alloc_consistent: cannot occupy 0x%lx", len_total);
293
-		goto err_nova;
294
-	}
295
-
296
-	// XXX The sbus_map_dma_area does this for us below, see comments.
297
-	// srmmu_mapiorange(0, virt_to_phys(va), res->start, len_total);
298
-	/*
299
-	 * XXX That's where sdev would be used. Currently we load
300
-	 * all iommu tables with the same translations.
301
-	 */
302
-	if (sbus_map_dma_area(dev, dma_addrp, va, res->start, len_total) != 0)
303
-		goto err_noiommu;
304
-
305
-	res->name = op->dev.of_node->name;
306
-
307
-	return (void *)(unsigned long)res->start;
308
-
309
-err_noiommu:
310
-	release_resource(res);
311
-err_nova:
312
-	kfree(res);
313
-err_nomem:
314
-	free_pages(va, order);
315
-err_nopages:
316
-	return NULL;
317
-}
318
-
319
-static void sbus_free_coherent(struct device *dev, size_t n, void *p,
320
-			       dma_addr_t ba, unsigned long attrs)
321
-{
322
-	struct resource *res;
323
-	struct page *pgv;
324
-
325
-	if ((res = lookup_resource(&_sparc_dvma,
326
-	    (unsigned long)p)) == NULL) {
327
-		printk("sbus_free_consistent: cannot free %p\n", p);
328
-		return;
329
-	}
330
-
331
-	if (((unsigned long)p & (PAGE_SIZE-1)) != 0) {
332
-		printk("sbus_free_consistent: unaligned va %p\n", p);
333
-		return;
334
-	}
335
-
336
-	n = PAGE_ALIGN(n);
337
-	if (resource_size(res) != n) {
338
-		printk("sbus_free_consistent: region 0x%lx asked 0x%zx\n",
339
-		    (long)resource_size(res), n);
340
-		return;
341
-	}
342
-
343
-	release_resource(res);
344
-	kfree(res);
345
-
346
-	pgv = virt_to_page(p);
347
-	sbus_unmap_dma_area(dev, ba, n);
348
-
349
-	__free_pages(pgv, get_order(n));
350
-}
351
-
352
-/*
353
- * Map a chunk of memory so that devices can see it.
354
- * CPU view of this memory may be inconsistent with
355
- * a device view and explicit flushing is necessary.
356
- */
357
-static dma_addr_t sbus_map_page(struct device *dev, struct page *page,
358
-				unsigned long offset, size_t len,
359
-				enum dma_data_direction dir,
360
-				unsigned long attrs)
361
-{
362
-	void *va = page_address(page) + offset;
363
-
364
-	/* XXX why are some lengths signed, others unsigned? */
365
-	if (len <= 0) {
366
-		return 0;
367
-	}
368
-	/* XXX So what is maxphys for us and how do drivers know it? */
369
-	if (len > 256*1024) {			/* __get_free_pages() limit */
370
-		return 0;
371
-	}
372
-	return mmu_get_scsi_one(dev, va, len);
373
-}
374
-
375
-static void sbus_unmap_page(struct device *dev, dma_addr_t ba, size_t n,
376
-			    enum dma_data_direction dir, unsigned long attrs)
377
-{
378
-	mmu_release_scsi_one(dev, ba, n);
379
-}
380
-
381
-static int sbus_map_sg(struct device *dev, struct scatterlist *sg, int n,
382
-		       enum dma_data_direction dir, unsigned long attrs)
383
-{
384
-	mmu_get_scsi_sgl(dev, sg, n);
385
-	return n;
386
-}
387
-
388
-static void sbus_unmap_sg(struct device *dev, struct scatterlist *sg, int n,
389
-			  enum dma_data_direction dir, unsigned long attrs)
390
-{
391
-	mmu_release_scsi_sgl(dev, sg, n);
392
-}
393
-
394
-static void sbus_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
395
-				 int n,	enum dma_data_direction dir)
396
-{
397
-	BUG();
398
-}
399
-
400
-static void sbus_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
401
-				    int n, enum dma_data_direction dir)
402
-{
403
-	BUG();
404
-}
405
-
406
-static int sbus_dma_supported(struct device *dev, u64 mask)
407
-{
408
-	return 0;
409
-}
410
-
411
-static const struct dma_map_ops sbus_dma_ops = {
412
-	.alloc			= sbus_alloc_coherent,
413
-	.free			= sbus_free_coherent,
414
-	.map_page		= sbus_map_page,
415
-	.unmap_page		= sbus_unmap_page,
416
-	.map_sg			= sbus_map_sg,
417
-	.unmap_sg		= sbus_unmap_sg,
418
-	.sync_sg_for_cpu	= sbus_sync_sg_for_cpu,
419
-	.sync_sg_for_device	= sbus_sync_sg_for_device,
420
-	.dma_supported		= sbus_dma_supported,
421
-};
422302 
423303 static int __init sparc_register_ioport(void)
424304 {
....@@ -438,45 +318,30 @@
438318 void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
439319 		gfp_t gfp, unsigned long attrs)
440320 {
441
-	unsigned long len_total = PAGE_ALIGN(size);
321
+	unsigned long addr;
442322 	void *va;
443
-	struct resource *res;
444
-	int order;
445323 
446
-	if (size == 0) {
324
+	if (!size || size > 256 * 1024)	/* __get_free_pages() limit */
447325 		return NULL;
448
-	}
449
-	if (size > 256*1024) {			/* __get_free_pages() limit */
326
+
327
+	size = PAGE_ALIGN(size);
328
+	va = (void *) __get_free_pages(gfp | __GFP_ZERO, get_order(size));
329
+	if (!va) {
330
+		printk("%s: no %zd pages\n", __func__, size >> PAGE_SHIFT);
450331 		return NULL;
451332 	}
452333 
453
-	order = get_order(len_total);
454
-	va = (void *) __get_free_pages(gfp, order);
455
-	if (va == NULL) {
456
-		printk("%s: no %ld pages\n", __func__, len_total>>PAGE_SHIFT);
457
-		goto err_nopages;
458
-	}
459
-
460
-	if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
461
-		printk("%s: no core\n", __func__);
334
+	addr = sparc_dma_alloc_resource(dev, size);
335
+	if (!addr)
462336 		goto err_nomem;
463
-	}
464337 
465
-	if (allocate_resource(&_sparc_dvma, res, len_total,
466
-	    _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
467
-		printk("%s: cannot occupy 0x%lx", __func__, len_total);
468
-		goto err_nova;
469
-	}
470
-	srmmu_mapiorange(0, virt_to_phys(va), res->start, len_total);
338
+	srmmu_mapiorange(0, virt_to_phys(va), addr, size);
471339 
472340 	*dma_handle = virt_to_phys(va);
473
-	return (void *) res->start;
341
+	return (void *)addr;
474342 
475
-err_nova:
476
-	kfree(res);
477343 err_nomem:
478
-	free_pages((unsigned long)va, order);
479
-err_nopages:
344
+	free_pages((unsigned long)va, get_order(size));
480345 	return NULL;
481346 }
482347 
....@@ -491,45 +356,24 @@
491356 void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
492357 		dma_addr_t dma_addr, unsigned long attrs)
493358 {
494
-	struct resource *res;
495
-
496
-	if ((res = lookup_resource(&_sparc_dvma,
497
-	    (unsigned long)cpu_addr)) == NULL) {
498
-		printk("%s: cannot free %p\n", __func__, cpu_addr);
499
-		return;
500
-	}
501
-
502
-	if (((unsigned long)cpu_addr & (PAGE_SIZE-1)) != 0) {
503
-		printk("%s: unaligned va %p\n", __func__, cpu_addr);
504
-		return;
505
-	}
506
-
507359 	size = PAGE_ALIGN(size);
508
-	if (resource_size(res) != size) {
509
-		printk("%s: region 0x%lx asked 0x%zx\n", __func__,
510
-		    (long)resource_size(res), size);
360
+
361
+	if (!sparc_dma_free_resource(cpu_addr, size))
511362 		return;
512
-	}
513363 
514364 	dma_make_coherent(dma_addr, size);
515365 	srmmu_unmapiorange((unsigned long)cpu_addr, size);
516
-
517
-	release_resource(res);
518
-	kfree(res);
519366 	free_pages((unsigned long)phys_to_virt(dma_addr), get_order(size));
520367 }
521368 
522369 /* IIep is write-through, not flushing on cpu to device transfer. */
523370 
524
-void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
525
-		size_t size, enum dma_data_direction dir)
371
+void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
372
+		enum dma_data_direction dir)
526373 {
527374 	if (dir != PCI_DMA_TODEVICE)
528375 		dma_make_coherent(paddr, PAGE_ALIGN(size));
529376 }
530
-
531
-const struct dma_map_ops *dma_ops = &sbus_dma_ops;
532
-EXPORT_SYMBOL(dma_ops);
533377 
534378 #ifdef CONFIG_PROC_FS
535379