13  * Dynamic DMA mapping support, Apple U3, U4 & IBM CPC925 "DART" iommu.
35 #include "dart.h"
37 /* DART table address and size */
41 /* Mapped base address for the dart */
42 static unsigned int __iomem *dart;  variable
67 	DBG("dart: flush\n");  in dart_tlb_invalidate_all()
69 	/* To invalidate the DART, set the DARTCNTL_FLUSHTLB bit in the  in dart_tlb_invalidate_all()
72 	 * Gotcha: Sometimes, the DART won't detect that the bit gets  in dart_tlb_invalidate_all()
95 			panic("DART: TLB did not flush after waiting a long "  in dart_tlb_invalidate_all()
127 			panic("DART: TLB did not flush after waiting a long "  in dart_tlb_invalidate_one()
151 	 * DART hardware will see.  in dart_cache_sync()
180 	DBG("dart: build at: %lx, %lx, addr: %x\n", index, npages, uaddr);  in dart_build()
218 	DBG("dart: free at: %lx, %lx\n", index, npages);  in dart_free()
232 	/* 512 pages (2MB) is max DART tablesize. */  in allocate_dart()
243 		panic("Failed to allocate 16MB below 2GB for DART table\n");  in allocate_dart()
245 	/* Allocate a spare page to map all invalid DART pages. We need to do  in allocate_dart()
251 		panic("DART: table allocation failed\n");  in allocate_dart()
256 	printk(KERN_INFO "DART table allocated at: %p\n", dart_tablebase);  in allocate_dart()
270 	 * Only use the DART if the machine has more than 1GB of RAM  in dart_init()
280 	/* Get DART registers */  in dart_init()
282 		panic("DART: can't get register base ! ");  in dart_init()
284 	/* Map in DART registers */  in dart_init()
285 	dart = ioremap(r.start, resource_size(&r));  in dart_init()
286 	if (dart == NULL)  in dart_init()
287 		panic("DART: Cannot map registers!");  in dart_init()
289 	/* Allocate the DART and dummy page */  in dart_init()
299 	/* Initialize DART with table base and enable it. */  in dart_init()
315 	/* Invalidate DART to get rid of possible stale TLBs */  in dart_init()
318 	printk(KERN_INFO "DART IOMMU initialized for %s type chipset\n",  in dart_init()
346 	/* Reserve the last page of the DART to avoid possible prefetch  in iommu_table_dart_setup()
347 	 * past the DART mapped area  in iommu_table_dart_setup()
393 	/* Find the DART in the device-tree */  in iommu_init_early_dart()
394 	dn = of_find_compatible_node(NULL, "dart", "u3-dart");  in iommu_init_early_dart()
396 		dn = of_find_compatible_node(NULL, "dart", "u4-dart");  in iommu_init_early_dart()
402 	/* Initialize the DART HW */  in iommu_init_early_dart()
408 	 * U4 supports a DART bypass, we use it for 64-bit capable devices to  in iommu_init_early_dart()