44f22bd91e
ThunderX PCIe controller to off-chip devices (so-called PEM) is not fully compliant with ECAM standard. It uses non-standard configuration space accessors (see thunder_pem_ecam_ops) and custom configuration space granulation (see bus_shift = 24). In order to access configuration space and probe PEM as ACPI-based PCI host controller we need to add MCFG quirk infrastructure. This involves: 1. A new thunder_pem_acpi_init() init function to locate PEM-specific register ranges using ACPI. 2. Export PEM thunder_pem_ecam_ops structure so it is visible to MCFG quirk code. 3. New quirk entries for each PEM segment. Each contains platform IDs, mentioned thunder_pem_ecam_ops and CFG resources. Quirk is considered for ThunderX silicon pass2.x only which is identified via MCFG revision 1. ThunderX pass 2.x requires the following accessors: NUMA Node 0 PCI segments 0- 3: pci_generic_ecam_ops (ECAM-compliant) NUMA Node 0 PCI segments 4- 9: thunder_pem_ecam_ops (MCFG quirk) NUMA Node 1 PCI segments 10-13: pci_generic_ecam_ops (ECAM-compliant) NUMA Node 1 PCI segments 14-19: thunder_pem_ecam_ops (MCFG quirk) [bhelgaas: adapt to use acpi_get_rc_resources(), update Makefile/ifdefs so quirk doesn't depend on CONFIG_PCI_HOST_THUNDER_PEM] Signed-off-by: Tomasz Nowicki <tn@semihalf.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/*
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* Copyright 2016 Broadcom
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation (the "GPL").
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License version 2 (GPLv2) for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 (GPLv2) along with this source code.
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*/
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#ifndef DRIVERS_PCI_ECAM_H
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#define DRIVERS_PCI_ECAM_H
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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/*
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* struct to hold pci ops and bus shift of the config window
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* for a PCI controller.
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*/
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struct pci_config_window;
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struct pci_ecam_ops {
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unsigned int bus_shift;
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struct pci_ops pci_ops;
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int (*init)(struct pci_config_window *);
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};
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/*
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* struct to hold the mappings of a config space window. This
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* is expected to be used as sysdata for PCI controllers that
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* use ECAM.
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*/
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struct pci_config_window {
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struct resource res;
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struct resource busr;
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void *priv;
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struct pci_ecam_ops *ops;
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union {
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void __iomem *win; /* 64-bit single mapping */
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void __iomem **winp; /* 32-bit per-bus mapping */
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};
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struct device *parent;/* ECAM res was from this dev */
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};
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/* create and free pci_config_window */
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struct pci_config_window *pci_ecam_create(struct device *dev,
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struct resource *cfgres, struct resource *busr,
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struct pci_ecam_ops *ops);
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void pci_ecam_free(struct pci_config_window *cfg);
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/* map_bus when ->sysdata is an instance of pci_config_window */
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void __iomem *pci_ecam_map_bus(struct pci_bus *bus, unsigned int devfn,
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int where);
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/* default ECAM ops */
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extern struct pci_ecam_ops pci_generic_ecam_ops;
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#if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS)
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extern struct pci_ecam_ops pci_32b_ops; /* 32-bit accesses only */
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extern struct pci_ecam_ops hisi_pcie_ops; /* HiSilicon */
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extern struct pci_ecam_ops thunder_pem_ecam_ops; /* Cavium ThunderX 2.x */
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#endif
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#ifdef CONFIG_PCI_HOST_GENERIC
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/* for DT-based PCI controllers that support ECAM */
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int pci_host_common_probe(struct platform_device *pdev,
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struct pci_ecam_ops *ops);
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#endif
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#endif
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