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/*
* Copyright (C) 2004, 2006 MIPS Technologies, Inc. All rights reserved.
* Author: Maciej W. Rozycki <macro@mips.com>
* Copyright (C) 2018 Maciej W. Rozycki
*
* 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.
*/
#include <linux/dma-mapping.h>
#include <linux/pci.h>
/*
* Set the BCM1250, etc. PCI host bridge's TRDY timeout
* to the finite max.
*/
static void quirk_sb1250_pci(struct pci_dev *dev)
{
pci_write_config_byte(dev, 0x40, 0xff);
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIBYTE, PCI_DEVICE_ID_BCM1250_PCI,
quirk_sb1250_pci);
/*
* The BCM1250, etc. PCI host bridge does not support DAC on its 32-bit
* bus, so we set the bus's DMA mask accordingly. However the HT link
* down the artificial PCI-HT bridge supports 40-bit addressing and the
* SP1011 HT-PCI bridge downstream supports both DAC and a 64-bit bus
* width, so we record the PCI-HT bridge's secondary and subordinate bus
* numbers and do not set the mask for devices present in the inclusive
* range of those.
*/
struct sb1250_bus_dma_mask_exclude {
bool set;
unsigned char start;
unsigned char end;
};
static int sb1250_bus_dma_mask(struct pci_dev *dev, void *data)
{
struct sb1250_bus_dma_mask_exclude *exclude = data;
bool exclude_this;
bool ht_bridge;
exclude_this = exclude->set && (dev->bus->number >= exclude->start &&
dev->bus->number <= exclude->end);
ht_bridge = !exclude->set && (dev->vendor == PCI_VENDOR_ID_SIBYTE &&
dev->device == PCI_DEVICE_ID_BCM1250_HT);
if (exclude_this) {
dev_dbg(&dev->dev, "not disabling DAC for device");
} else if (ht_bridge) {
exclude->start = dev->subordinate->number;
exclude->end = pci_bus_max_busnr(dev->subordinate);
exclude->set = true;
dev_dbg(&dev->dev, "not disabling DAC for [bus %02x-%02x]",
exclude->start, exclude->end);
} else {
dev_dbg(&dev->dev, "disabling DAC for device");
dev->dev.bus_dma_mask = DMA_BIT_MASK(32);
}
return 0;
}
static void quirk_sb1250_pci_dac(struct pci_dev *dev)
{
struct sb1250_bus_dma_mask_exclude exclude = { .set = false };
pci_walk_bus(dev->bus, sb1250_bus_dma_mask, &exclude);
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_SIBYTE, PCI_DEVICE_ID_BCM1250_PCI,
quirk_sb1250_pci_dac);
/*
* The BCM1250, etc. PCI/HT bridge reports as a host bridge.
*/
static void quirk_sb1250_ht(struct pci_dev *dev)
{
dev->class = PCI_CLASS_BRIDGE_PCI << 8;
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIBYTE, PCI_DEVICE_ID_BCM1250_HT,
quirk_sb1250_ht);
/*
* Set the SP1011 HT/PCI bridge's TRDY timeout to the finite max.
*/
static void quirk_sp1011(struct pci_dev *dev)
{
pci_write_config_byte(dev, 0x64, 0xff);
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIPACKETS, PCI_DEVICE_ID_SP1011,
quirk_sp1011);
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