From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/powerpc/kernel/of_platform.c | 104 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 arch/powerpc/kernel/of_platform.c

(limited to 'arch/powerpc/kernel/of_platform.c')

diff --git a/arch/powerpc/kernel/of_platform.c b/arch/powerpc/kernel/of_platform.c
new file mode 100644
index 000000000..f89376ff6
--- /dev/null
+++ b/arch/powerpc/kernel/of_platform.c
@@ -0,0 +1,104 @@
+// 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/of.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.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 */
-- 
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