2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
// 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 <macro@mips.com>
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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 mask 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 mask 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_mask_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_mask(struct pci_dev *dev, void *data)
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{
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struct sb1250_bus_dma_mask_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_mask = 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_mask_exclude exclude = { .set = false };
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pci_walk_bus(dev->bus, sb1250_bus_dma_mask, &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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