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91 lines
2.7 KiB
91 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2004, 2006 MIPS Technologies, Inc. All rights reserved. |
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* Author: Maciej W. Rozycki <[email protected]> |
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* Copyright (C) 2018 Maciej W. Rozycki |
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*/ |
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#include <linux/dma-mapping.h> |
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#include <linux/pci.h> |
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/* |
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* Set the BCM1250, etc. PCI host bridge's TRDY timeout |
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* to the finite max. |
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*/ |
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static void quirk_sb1250_pci(struct pci_dev *dev) |
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{ |
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pci_write_config_byte(dev, 0x40, 0xff); |
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} |
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DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIBYTE, PCI_DEVICE_ID_BCM1250_PCI, |
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quirk_sb1250_pci); |
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/* |
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* The BCM1250, etc. PCI host bridge does not support DAC on its 32-bit |
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* bus, so we set the bus's DMA limit accordingly. However the HT link |
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* down the artificial PCI-HT bridge supports 40-bit addressing and the |
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* SP1011 HT-PCI bridge downstream supports both DAC and a 64-bit bus |
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* width, so we record the PCI-HT bridge's secondary and subordinate bus |
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* numbers and do not set the limit for devices present in the inclusive |
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* range of those. |
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*/ |
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struct sb1250_bus_dma_limit_exclude { |
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bool set; |
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unsigned char start; |
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unsigned char end; |
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}; |
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static int sb1250_bus_dma_limit(struct pci_dev *dev, void *data) |
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{ |
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struct sb1250_bus_dma_limit_exclude *exclude = data; |
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bool exclude_this; |
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bool ht_bridge; |
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exclude_this = exclude->set && (dev->bus->number >= exclude->start && |
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dev->bus->number <= exclude->end); |
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ht_bridge = !exclude->set && (dev->vendor == PCI_VENDOR_ID_SIBYTE && |
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dev->device == PCI_DEVICE_ID_BCM1250_HT); |
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if (exclude_this) { |
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dev_dbg(&dev->dev, "not disabling DAC for device"); |
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} else if (ht_bridge) { |
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exclude->start = dev->subordinate->number; |
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exclude->end = pci_bus_max_busnr(dev->subordinate); |
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exclude->set = true; |
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dev_dbg(&dev->dev, "not disabling DAC for [bus %02x-%02x]", |
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exclude->start, exclude->end); |
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} else { |
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dev_dbg(&dev->dev, "disabling DAC for device"); |
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dev->dev.bus_dma_limit = DMA_BIT_MASK(32); |
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} |
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return 0; |
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} |
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static void quirk_sb1250_pci_dac(struct pci_dev *dev) |
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{ |
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struct sb1250_bus_dma_limit_exclude exclude = { .set = false }; |
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pci_walk_bus(dev->bus, sb1250_bus_dma_limit, &exclude); |
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} |
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_SIBYTE, PCI_DEVICE_ID_BCM1250_PCI, |
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quirk_sb1250_pci_dac); |
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/* |
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* The BCM1250, etc. PCI/HT bridge reports as a host bridge. |
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*/ |
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static void quirk_sb1250_ht(struct pci_dev *dev) |
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{ |
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dev->class = PCI_CLASS_BRIDGE_PCI << 8; |
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} |
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DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIBYTE, PCI_DEVICE_ID_BCM1250_HT, |
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quirk_sb1250_ht); |
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/* |
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* Set the SP1011 HT/PCI bridge's TRDY timeout to the finite max. |
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*/ |
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static void quirk_sp1011(struct pci_dev *dev) |
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{ |
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pci_write_config_byte(dev, 0x64, 0xff); |
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} |
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DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIPACKETS, PCI_DEVICE_ID_SP1011, |
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quirk_sp1011);
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