13  * Dynamic DMA mapping support, Apple U3, U4 & IBM CPC925 "DART" iommu.
36 #include "dart.h"
38 /* DART table address and size */
42 /* Mapped base address for the dart */
43 static unsigned int __iomem *dart;  variable
68 	DBG("dart: flush\n");  in dart_tlb_invalidate_all()
70 	/* To invalidate the DART, set the DARTCNTL_FLUSHTLB bit in the  in dart_tlb_invalidate_all()
73 	 * Gotcha: Sometimes, the DART won't detect that the bit gets  in dart_tlb_invalidate_all()
96 			panic("DART: TLB did not flush after waiting a long "  in dart_tlb_invalidate_all()
128 			panic("DART: TLB did not flush after waiting a long "  in dart_tlb_invalidate_one()
152 	 * DART hardware will see.  in dart_cache_sync()
181 	DBG("dart: build at: %lx, %lx, addr: %x\n", index, npages, uaddr);  in dart_build()
219 	DBG("dart: free at: %lx, %lx\n", index, npages);  in dart_free()
233 	/* 512 pages (2MB) is max DART tablesize. */  in allocate_dart()
244 		panic("Failed to allocate 16MB below 2GB for DART table\n");  in allocate_dart()
246 	/* There is no point scanning the DART space for leaks*/  in allocate_dart()
249 	/* Allocate a spare page to map all invalid DART pages. We need to do  in allocate_dart()
255 		panic("DART: table allocation failed\n");  in allocate_dart()
260 	printk(KERN_INFO "DART table allocated at: %p\n", dart_tablebase);  in allocate_dart()
274 	 * Only use the DART if the machine has more than 1GB of RAM  in dart_init()
284 	/* Get DART registers */  in dart_init()
286 		panic("DART: can't get register base ! ");  in dart_init()
288 	/* Map in DART registers */  in dart_init()
289 	dart = ioremap(r.start, resource_size(&r));  in dart_init()
290 	if (dart == NULL)  in dart_init()
291 		panic("DART: Cannot map registers!");  in dart_init()
293 	/* Allocate the DART and dummy page */  in dart_init()
303 	/* Initialize DART with table base and enable it. */  in dart_init()
319 	/* Invalidate DART to get rid of possible stale TLBs */  in dart_init()
322 	printk(KERN_INFO "DART IOMMU initialized for %s type chipset\n",  in dart_init()
350 	/* Reserve the last page of the DART to avoid possible prefetch  in iommu_table_dart_setup()
351 	 * past the DART mapped area  in iommu_table_dart_setup()
397 	/* Find the DART in the device-tree */  in iommu_init_early_dart()
398 	dn = of_find_compatible_node(NULL, "dart", "u3-dart");  in iommu_init_early_dart()
400 		dn = of_find_compatible_node(NULL, "dart", "u4-dart");  in iommu_init_early_dart()
406 	/* Initialize the DART HW */  in iommu_init_early_dart()
412 	 * U4 supports a DART bypass, we use it for 64-bit capable devices to  in iommu_init_early_dart()