1 // SPDX-License-Identifier: GPL-2.0-or-later
8 #include <linux/dma-mapping.h>
23  * The BCM1250, etc. PCI host bridge does not support DAC on its 32-bit
25  * down the artificial PCI-HT bridge supports 40-bit addressing and the
26  * SP1011 HT-PCI bridge downstream supports both DAC and a 64-bit bus
27  * width, so we record the PCI-HT bridge's secondary and subordinate bus
39 	struct sb1250_bus_dma_limit_exclude *exclude = data;  in sb1250_bus_dma_limit()  local
43 	exclude_this = exclude->set && (dev->bus->number >= exclude->start &&  in sb1250_bus_dma_limit()
44 					dev->bus->number <= exclude->end);  in sb1250_bus_dma_limit()
45 	ht_bridge = !exclude->set && (dev->vendor == PCI_VENDOR_ID_SIBYTE &&  in sb1250_bus_dma_limit()
46 				      dev->device == PCI_DEVICE_ID_BCM1250_HT);  in sb1250_bus_dma_limit()
49 		dev_dbg(&dev->dev, "not disabling DAC for device");  in sb1250_bus_dma_limit()
51 		exclude->start = dev->subordinate->number;  in sb1250_bus_dma_limit()
52 		exclude->end = pci_bus_max_busnr(dev->subordinate);  in sb1250_bus_dma_limit()
53 		exclude->set = true;  in sb1250_bus_dma_limit()
54 		dev_dbg(&dev->dev, "not disabling DAC for [bus %02x-%02x]",  in sb1250_bus_dma_limit()
55 			exclude->start, exclude->end);  in sb1250_bus_dma_limit()
57 		dev_dbg(&dev->dev, "disabling DAC for device");  in sb1250_bus_dma_limit()
58 		dev->dev.bus_dma_limit = DMA_BIT_MASK(32);  in sb1250_bus_dma_limit()
66 	struct sb1250_bus_dma_limit_exclude exclude = { .set = false };  in quirk_sb1250_pci_dac()  local
68 	pci_walk_bus(dev->bus, sb1250_bus_dma_limit, &exclude);  in quirk_sb1250_pci_dac()
78 	dev->class = PCI_CLASS_BRIDGE_PCI << 8;  in quirk_sb1250_ht()