1 // SPDX-License-Identifier: GPL-2.0-or-later
13  * Dynamic DMA mapping support, Apple U3, U4 & IBM CPC925 "DART" iommu.
22 #include <linux/dma-mapping.h>
29 #include <asm/iommu.h>
30 #include <asm/pci-bridge.h>
33 #include <asm/ppc-pci.h>
182 	orig_dp = dp = ((unsigned int*)tbl->it_base) + index;  in dart_build()
188 	while (l--) {  in dart_build()
199 		while (npages--)  in dart_build()
215 	 * bad DMAs, but then no 32-bit architecture ever does either.  in dart_free()
220 	orig_dp = dp  = ((unsigned int *)tbl->it_base) + index;  in dart_free()
222 	while (npages--)  in dart_free()
245 	/* Allocate a spare page to map all invalid DART pages. We need to do  in allocate_dart()
265 	/* IOMMU disabled by the user ? bail out */  in dart_init()
267 		return -ENODEV;  in dart_init()
271 	 * or if requested with iommu=on on cmdline.  in dart_init()
278 		return -ENODEV;  in dart_init()
284 	/* Map in DART registers */  in dart_init()
287 		panic("DART: Cannot map registers!");  in dart_init()
318 	printk(KERN_INFO "DART IOMMU initialized for %s type chipset\n",  in dart_init()
338 	/* Initialize the common IOMMU code */  in iommu_table_dart_setup()
343 	if (!iommu_init_table(&iommu_table_dart, -1, 0, 0))  in iommu_table_dart_setup()
344 		panic("Failed to initialize iommu table");  in iommu_table_dart_setup()
349 	set_bit(iommu_table_dart.it_size - 1, iommu_table_dart.it_map);  in iommu_table_dart_setup()
362 	struct device_node *np = of_node_get(dev->of_node);  in dart_device_on_pcie()
365 		if (of_device_is_compatible(np, "U4-pcie") ||  in dart_device_on_pcie()
366 		    of_device_is_compatible(np, "u4-pcie")) {  in dart_device_on_pcie()
377 	if (dart_is_u4 && dart_device_on_pcie(&dev->dev))  in pci_dma_dev_setup_dart()
378 		dev->dev.archdata.dma_offset = DART_U4_BYPASS_BASE;  in pci_dma_dev_setup_dart()
379 	set_iommu_table_base(&dev->dev, &iommu_table_dart);  in pci_dma_dev_setup_dart()
382 static bool iommu_bypass_supported_dart(struct pci_dev *dev, u64 mask)  in iommu_bypass_supported_dart()  argument
385 		dart_device_on_pcie(&dev->dev) &&  in iommu_bypass_supported_dart()
386 		mask >= DMA_BIT_MASK(40);  in iommu_bypass_supported_dart()
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()
408 	 * U4 supports a DART bypass, we use it for 64-bit capable devices to  in iommu_init_early_dart()
413 	controller_ops->dma_dev_setup = pci_dma_dev_setup_dart;  in iommu_init_early_dart()
414 	controller_ops->dma_bus_setup = pci_dma_bus_setup_dart;  in iommu_init_early_dart()
415 	controller_ops->iommu_bypass_supported = iommu_bypass_supported_dart;  in iommu_init_early_dart()