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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/powerpc/kernel/of_platform.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/powerpc/kernel/of_platform.c')
-rw-r--r-- | arch/powerpc/kernel/of_platform.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/of_platform.c b/arch/powerpc/kernel/of_platform.c new file mode 100644 index 0000000000..adc76fa58d --- /dev/null +++ b/arch/powerpc/kernel/of_platform.c @@ -0,0 +1,102 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. + * <benh@kernel.crashing.org> + * and Arnd Bergmann, IBM Corp. + */ + +#undef DEBUG + +#include <linux/string.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/export.h> +#include <linux/mod_devicetable.h> +#include <linux/pci.h> +#include <linux/platform_device.h> +#include <linux/atomic.h> + +#include <asm/errno.h> +#include <asm/topology.h> +#include <asm/pci-bridge.h> +#include <asm/ppc-pci.h> +#include <asm/eeh.h> + +#ifdef CONFIG_PPC_OF_PLATFORM_PCI + +/* The probing of PCI controllers from of_platform is currently + * 64 bits only, mostly due to gratuitous differences between + * the 32 and 64 bits PCI code on PowerPC and the 32 bits one + * lacking some bits needed here. + */ + +static int of_pci_phb_probe(struct platform_device *dev) +{ + struct pci_controller *phb; + + /* Check if we can do that ... */ + if (ppc_md.pci_setup_phb == NULL) + return -ENODEV; + + pr_info("Setting up PCI bus %pOF\n", dev->dev.of_node); + + /* Alloc and setup PHB data structure */ + phb = pcibios_alloc_controller(dev->dev.of_node); + if (!phb) + return -ENODEV; + + /* Setup parent in sysfs */ + phb->parent = &dev->dev; + + /* Setup the PHB using arch provided callback */ + if (ppc_md.pci_setup_phb(phb)) { + pcibios_free_controller(phb); + return -ENODEV; + } + + /* Process "ranges" property */ + pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0); + + /* Init pci_dn data structures */ + pci_devs_phb_init_dynamic(phb); + + /* Create EEH PE for the PHB */ + eeh_phb_pe_create(phb); + + /* Scan the bus */ + pcibios_scan_phb(phb); + if (phb->bus == NULL) + return -ENXIO; + + /* Claim resources. This might need some rework as well depending + * whether we are doing probe-only or not, like assigning unassigned + * resources etc... + */ + pcibios_claim_one_bus(phb->bus); + + /* Add probed PCI devices to the device model */ + pci_bus_add_devices(phb->bus); + + return 0; +} + +static const struct of_device_id of_pci_phb_ids[] = { + { .type = "pci", }, + { .type = "pcix", }, + { .type = "pcie", }, + { .type = "pciex", }, + { .type = "ht", }, + {} +}; + +static struct platform_driver of_pci_phb_driver = { + .probe = of_pci_phb_probe, + .driver = { + .name = "of-pci", + .of_match_table = of_pci_phb_ids, + }, +}; + +builtin_platform_driver(of_pci_phb_driver); + +#endif /* CONFIG_PPC_OF_PLATFORM_PCI */ |