summaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/pci_of_scan.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/kernel/pci_of_scan.c')
-rw-r--r--arch/powerpc/kernel/pci_of_scan.c130
1 files changed, 87 insertions, 43 deletions
diff --git a/arch/powerpc/kernel/pci_of_scan.c b/arch/powerpc/kernel/pci_of_scan.c
index ea3d98115b88..756043dd06e9 100644
--- a/arch/powerpc/kernel/pci_of_scan.c
+++ b/arch/powerpc/kernel/pci_of_scan.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Helper routines to scan the device tree for PCI devices and busses
*
@@ -8,16 +9,12 @@
* Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
* Rework, based on alpha PCI code.
* Copyright (c) 2009 Secret Lab Technologies Ltd.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
*/
#include <linux/pci.h>
#include <linux/export.h>
+#include <linux/of.h>
#include <asm/pci-bridge.h>
-#include <asm/prom.h>
/**
* get_int_prop - Decode a u32 from a device tree property
@@ -37,29 +34,75 @@ static u32 get_int_prop(struct device_node *np, const char *name, u32 def)
* pci_parse_of_flags - Parse the flags cell of a device tree PCI address
* @addr0: value of 1st cell of a device tree PCI address.
* @bridge: Set this flag if the address is from a bridge 'ranges' property
+ *
+ * PCI Bus Binding to IEEE Std 1275-1994
+ *
+ * Bit# 33222222 22221111 11111100 00000000
+ * 10987654 32109876 54321098 76543210
+ * phys.hi cell: npt000ss bbbbbbbb dddddfff rrrrrrrr
+ * phys.mid cell: hhhhhhhh hhhhhhhh hhhhhhhh hhhhhhhh
+ * phys.lo cell: llllllll llllllll llllllll llllllll
+ *
+ * where:
+ * n is 0 if the address is relocatable, 1 otherwise
+ * p is 1 if the addressable region is "prefetchable", 0 otherwise
+ * t is 1 if the address is aliased (for non-relocatable I/O),
+ * below 1 MB (for Memory),or below 64 KB (for relocatable I/O).
+ * ss is the space code, denoting the address space:
+ * 00 denotes Configuration Space
+ * 01 denotes I/O Space
+ * 10 denotes 32-bit-address Memory Space
+ * 11 denotes 64-bit-address Memory Space
+ * bbbbbbbb is the 8-bit Bus Number
+ * ddddd is the 5-bit Device Number
+ * fff is the 3-bit Function Number
+ * rrrrrrrr is the 8-bit Register Number
*/
-static unsigned int pci_parse_of_flags(u32 addr0, int bridge)
+#define OF_PCI_ADDR0_SPACE(ss) (((ss)&3)<<24)
+#define OF_PCI_ADDR0_SPACE_CFG OF_PCI_ADDR0_SPACE(0)
+#define OF_PCI_ADDR0_SPACE_IO OF_PCI_ADDR0_SPACE(1)
+#define OF_PCI_ADDR0_SPACE_MMIO32 OF_PCI_ADDR0_SPACE(2)
+#define OF_PCI_ADDR0_SPACE_MMIO64 OF_PCI_ADDR0_SPACE(3)
+#define OF_PCI_ADDR0_SPACE_MASK OF_PCI_ADDR0_SPACE(3)
+#define OF_PCI_ADDR0_RELOC (1UL<<31)
+#define OF_PCI_ADDR0_PREFETCH (1UL<<30)
+#define OF_PCI_ADDR0_ALIAS (1UL<<29)
+#define OF_PCI_ADDR0_BUS 0x00FF0000UL
+#define OF_PCI_ADDR0_DEV 0x0000F800UL
+#define OF_PCI_ADDR0_FN 0x00000700UL
+#define OF_PCI_ADDR0_BARREG 0x000000FFUL
+
+unsigned int pci_parse_of_flags(u32 addr0, int bridge)
{
- unsigned int flags = 0;
+ unsigned int flags = 0, as = addr0 & OF_PCI_ADDR0_SPACE_MASK;
- if (addr0 & 0x02000000) {
+ if (as == OF_PCI_ADDR0_SPACE_MMIO32 || as == OF_PCI_ADDR0_SPACE_MMIO64) {
flags = IORESOURCE_MEM | PCI_BASE_ADDRESS_SPACE_MEMORY;
- flags |= (addr0 >> 22) & PCI_BASE_ADDRESS_MEM_TYPE_64;
- flags |= (addr0 >> 28) & PCI_BASE_ADDRESS_MEM_TYPE_1M;
- if (addr0 & 0x40000000)
- flags |= IORESOURCE_PREFETCH
- | PCI_BASE_ADDRESS_MEM_PREFETCH;
+
+ if (as == OF_PCI_ADDR0_SPACE_MMIO64)
+ flags |= PCI_BASE_ADDRESS_MEM_TYPE_64 | IORESOURCE_MEM_64;
+
+ if (addr0 & OF_PCI_ADDR0_ALIAS)
+ flags |= PCI_BASE_ADDRESS_MEM_TYPE_1M;
+
+ if (addr0 & OF_PCI_ADDR0_PREFETCH)
+ flags |= IORESOURCE_PREFETCH |
+ PCI_BASE_ADDRESS_MEM_PREFETCH;
+
/* Note: We don't know whether the ROM has been left enabled
* by the firmware or not. We mark it as disabled (ie, we do
* not set the IORESOURCE_ROM_ENABLE flag) for now rather than
* do a config space read, it will be force-enabled if needed
*/
- if (!bridge && (addr0 & 0xff) == 0x30)
+ if (!bridge && (addr0 & OF_PCI_ADDR0_BARREG) == PCI_ROM_ADDRESS)
flags |= IORESOURCE_READONLY;
- } else if (addr0 & 0x01000000)
+
+ } else if (as == OF_PCI_ADDR0_SPACE_IO)
flags = IORESOURCE_IO | PCI_BASE_ADDRESS_SPACE_IO;
+
if (flags)
flags |= IORESOURCE_SIZEALIGN;
+
return flags;
}
@@ -80,10 +123,16 @@ static void of_pci_parse_addrs(struct device_node *node, struct pci_dev *dev)
const __be32 *addrs;
u32 i;
int proplen;
+ bool mark_unset = false;
addrs = of_get_property(node, "assigned-addresses", &proplen);
- if (!addrs)
- return;
+ if (!addrs || !proplen) {
+ addrs = of_get_property(node, "reg", &proplen);
+ if (!addrs || !proplen)
+ return;
+ mark_unset = true;
+ }
+
pr_debug(" parse addresses (%d bytes) @ %p\n", proplen, addrs);
for (; proplen >= 20; proplen -= 20, addrs += 5) {
flags = pci_parse_of_flags(of_read_number(addrs, 1), 0);
@@ -108,6 +157,8 @@ static void of_pci_parse_addrs(struct device_node *node, struct pci_dev *dev)
continue;
}
res->flags = flags;
+ if (mark_unset)
+ res->flags |= IORESOURCE_UNSET;
res->name = pci_name(dev);
region.start = base;
region.end = base + size - 1;
@@ -125,16 +176,13 @@ struct pci_dev *of_create_pci_dev(struct device_node *node,
struct pci_bus *bus, int devfn)
{
struct pci_dev *dev;
- const char *type;
dev = pci_alloc_dev(bus);
if (!dev)
return NULL;
- type = of_get_property(node, "device_type", NULL);
- if (type == NULL)
- type = "";
- pr_debug(" create device, devfn: %x, type: %s\n", devfn, type);
+ pr_debug(" create device, devfn: %x, type: %s\n", devfn,
+ of_node_get_device_type(node));
dev->dev.of_node = of_node_get(node);
dev->dev.parent = bus->bridge;
@@ -167,12 +215,12 @@ struct pci_dev *of_create_pci_dev(struct device_node *node,
/* Early fixups, before probing the BARs */
pci_fixup_device(pci_fixup_early, dev);
- if (!strcmp(type, "pci") || !strcmp(type, "pciex")) {
+ if (of_node_is_type(node, "pci") || of_node_is_type(node, "pciex")) {
/* a PCI-PCI bridge */
dev->hdr_type = PCI_HEADER_TYPE_BRIDGE;
dev->rom_base_reg = PCI_ROM_ADDRESS1;
set_pcie_hotplug_bridge(dev);
- } else if (!strcmp(type, "cardbus")) {
+ } else if (of_node_is_type(node, "cardbus")) {
dev->hdr_type = PCI_HEADER_TYPE_CARDBUS;
} else {
dev->hdr_type = PCI_HEADER_TYPE_NORMAL;
@@ -196,7 +244,7 @@ EXPORT_SYMBOL(of_create_pci_dev);
* @dev: pci_dev structure for the bridge
*
* of_scan_bus() calls this routine for each PCI bridge that it finds, and
- * this routine in turn call of_scan_bus() recusively to scan for more child
+ * this routine in turn call of_scan_bus() recursively to scan for more child
* devices.
*/
void of_scan_pci_bridge(struct pci_dev *dev)
@@ -211,19 +259,19 @@ void of_scan_pci_bridge(struct pci_dev *dev)
unsigned int flags;
u64 size;
- pr_debug("of_scan_pci_bridge(%s)\n", node->full_name);
+ pr_debug("of_scan_pci_bridge(%pOF)\n", node);
/* parse bus-range property */
busrange = of_get_property(node, "bus-range", &len);
if (busrange == NULL || len != 8) {
- printk(KERN_DEBUG "Can't get bus-range for PCI-PCI bridge %s\n",
- node->full_name);
+ printk(KERN_DEBUG "Can't get bus-range for PCI-PCI bridge %pOF\n",
+ node);
return;
}
ranges = of_get_property(node, "ranges", &len);
if (ranges == NULL) {
- printk(KERN_DEBUG "Can't get ranges for PCI-PCI bridge %s\n",
- node->full_name);
+ printk(KERN_DEBUG "Can't get ranges for PCI-PCI bridge %pOF\n",
+ node);
return;
}
@@ -233,8 +281,8 @@ void of_scan_pci_bridge(struct pci_dev *dev)
bus = pci_add_new_bus(dev->bus, dev,
of_read_number(busrange, 1));
if (!bus) {
- printk(KERN_ERR "Failed to create pci bus for %s\n",
- node->full_name);
+ printk(KERN_ERR "Failed to create pci bus for %pOF\n",
+ node);
return;
}
}
@@ -262,13 +310,13 @@ void of_scan_pci_bridge(struct pci_dev *dev)
res = bus->resource[0];
if (res->flags) {
printk(KERN_ERR "PCI: ignoring extra I/O range"
- " for bridge %s\n", node->full_name);
+ " for bridge %pOF\n", node);
continue;
}
} else {
if (i >= PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES) {
printk(KERN_ERR "PCI: too many memory ranges"
- " for bridge %s\n", node->full_name);
+ " for bridge %pOF\n", node);
continue;
}
res = bus->resource[i];
@@ -307,7 +355,7 @@ static struct pci_dev *of_scan_pci_dev(struct pci_bus *bus,
struct eeh_dev *edev = pdn_to_eeh_dev(PCI_DN(dn));
#endif
- pr_debug(" * %s\n", dn->full_name);
+ pr_debug(" * %pOF\n", dn);
if (!of_device_is_available(dn))
return NULL;
@@ -350,8 +398,8 @@ static void __of_scan_bus(struct device_node *node, struct pci_bus *bus,
struct device_node *child;
struct pci_dev *dev;
- pr_debug("of_scan_bus(%s) bus no %d...\n",
- node->full_name, bus->number);
+ pr_debug("of_scan_bus(%pOF) bus no %d...\n",
+ node, bus->number);
/* Scan direct children */
for_each_child_of_node(node, child) {
@@ -366,14 +414,10 @@ static void __of_scan_bus(struct device_node *node, struct pci_bus *bus,
*/
if (!rescan_existing)
pcibios_setup_bus_self(bus);
- pcibios_setup_bus_devices(bus);
/* Now scan child busses */
- list_for_each_entry(dev, &bus->devices, bus_list) {
- if (pci_is_bridge(dev)) {
- of_scan_pci_bridge(dev);
- }
- }
+ for_each_pci_bridge(dev, bus)
+ of_scan_pci_bridge(dev);
}
/**
generated by cgit (git 2.34.1) at 2025-12-25 13:31:26 +0000