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Diffstat (limited to 'arch/powerpc/kernel/pci_of_scan.c')
-rw-r--r--arch/powerpc/kernel/pci_of_scan.c228
1 files changed, 153 insertions, 75 deletions
diff --git a/arch/powerpc/kernel/pci_of_scan.c b/arch/powerpc/kernel/pci_of_scan.c
index 6b0ba5854d99..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
*
@@ -8,28 +9,24 @@
* 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
*/
static u32 get_int_prop(struct device_node *np, const char *name, u32 def)
{
- const u32 *prop;
+ const __be32 *prop;
int len;
prop = of_get_property(np, name, &len);
if (prop && len >= 4)
- return *prop;
+ return of_read_number(prop, 1);
return def;
}
@@ -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
*/
+#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;
}
@@ -77,23 +120,29 @@ static void of_pci_parse_addrs(struct device_node *node, struct pci_dev *dev)
unsigned int flags;
struct pci_bus_region region;
struct resource *res;
- const u32 *addrs;
+ 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(addrs[0], 0);
+ flags = pci_parse_of_flags(of_read_number(addrs, 1), 0);
if (!flags)
continue;
base = of_read_number(&addrs[1], 2);
size = of_read_number(&addrs[3], 2);
if (!size)
continue;
- i = addrs[0] & 0xff;
+ i = of_read_number(addrs, 1) & 0xff;
pr_debug(" base: %llx, size: %llx, i: %x\n",
(unsigned long long)base,
(unsigned long long)size, i);
@@ -102,16 +151,18 @@ static void of_pci_parse_addrs(struct device_node *node, struct pci_dev *dev)
res = &dev->resource[(i - PCI_BASE_ADDRESS_0) >> 2];
} else if (i == dev->rom_base_reg) {
res = &dev->resource[PCI_ROM_RESOURCE];
- flags |= IORESOURCE_READONLY | IORESOURCE_CACHEABLE;
+ flags |= IORESOURCE_READONLY;
} else {
printk(KERN_ERR "PCI: bad cfg reg num 0x%x\n", i);
continue;
}
res->flags = flags;
+ if (mark_unset)
+ res->flags |= IORESOURCE_UNSET;
res->name = pci_name(dev);
region.start = base;
region.end = base + size - 1;
- pcibios_bus_to_resource(dev, res, &region);
+ pcibios_bus_to_resource(dev->bus, res, &region);
}
}
@@ -125,17 +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;
- struct pci_slot *slot;
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;
@@ -145,10 +192,7 @@ struct pci_dev *of_create_pci_dev(struct device_node *node,
dev->needs_freset = 0; /* pcie fundamental reset required */
set_pcie_port_type(dev);
- list_for_each_entry(slot, &dev->bus->slots, list)
- if (PCI_SLOT(dev->devfn) == slot->number)
- dev->slot = slot;
-
+ pci_dev_assign_slot(dev);
dev->vendor = get_int_prop(node, "vendor-id", 0xffff);
dev->device = get_int_prop(node, "device-id", 0xffff);
dev->subsystem_vendor = get_int_prop(node, "subsystem-vendor-id", 0);
@@ -171,18 +215,18 @@ 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;
dev->rom_base_reg = PCI_ROM_ADDRESS;
/* Maybe do a default OF mapping here */
- dev->irq = NO_IRQ;
+ dev->irq = 0;
}
of_pci_parse_addrs(node, dev);
@@ -200,45 +244,52 @@ 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)
{
struct device_node *node = dev->dev.of_node;
struct pci_bus *bus;
- const u32 *busrange, *ranges;
+ struct pci_controller *phb;
+ const __be32 *busrange, *ranges;
int len, i, mode;
struct pci_bus_region region;
struct resource *res;
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;
}
- bus = pci_add_new_bus(dev->bus, dev, busrange[0]);
+ bus = pci_find_bus(pci_domain_nr(dev->bus),
+ of_read_number(busrange, 1));
if (!bus) {
- printk(KERN_ERR "Failed to create pci bus for %s\n",
- node->full_name);
- return;
+ bus = pci_add_new_bus(dev->bus, dev,
+ of_read_number(busrange, 1));
+ if (!bus) {
+ printk(KERN_ERR "Failed to create pci bus for %pOF\n",
+ node);
+ return;
+ }
}
bus->primary = dev->bus->number;
- pci_bus_insert_busn_res(bus, busrange[0], busrange[1]);
+ pci_bus_insert_busn_res(bus, of_read_number(busrange, 1),
+ of_read_number(busrange+1, 1));
bus->bridge_ctl = 0;
/* parse ranges property */
@@ -251,7 +302,7 @@ void of_scan_pci_bridge(struct pci_dev *dev)
}
i = 1;
for (; len >= 32; len -= 32, ranges += 8) {
- flags = pci_parse_of_flags(ranges[0], 1);
+ flags = pci_parse_of_flags(of_read_number(ranges, 1), 1);
size = of_read_number(&ranges[6], 2);
if (flags == 0 || size == 0)
continue;
@@ -259,13 +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];
@@ -274,15 +325,17 @@ void of_scan_pci_bridge(struct pci_dev *dev)
res->flags = flags;
region.start = of_read_number(&ranges[1], 2);
region.end = region.start + size - 1;
- pcibios_bus_to_resource(dev, res, &region);
+ pcibios_bus_to_resource(dev->bus, res, &region);
}
sprintf(bus->name, "PCI Bus %04x:%02x", pci_domain_nr(bus),
bus->number);
pr_debug(" bus name: %s\n", bus->name);
+ phb = pci_bus_to_host(bus);
+
mode = PCI_PROBE_NORMAL;
- if (ppc_md.pci_probe_mode)
- mode = ppc_md.pci_probe_mode(bus);
+ if (phb->controller_ops.probe_mode)
+ mode = phb->controller_ops.probe_mode(bus);
pr_debug(" probe mode: %d\n", mode);
if (mode == PCI_PROBE_DEVTREE)
@@ -292,6 +345,47 @@ void of_scan_pci_bridge(struct pci_dev *dev)
}
EXPORT_SYMBOL(of_scan_pci_bridge);
+static struct pci_dev *of_scan_pci_dev(struct pci_bus *bus,
+ struct device_node *dn)
+{
+ struct pci_dev *dev = NULL;
+ const __be32 *reg;
+ int reglen, devfn;
+#ifdef CONFIG_EEH
+ struct eeh_dev *edev = pdn_to_eeh_dev(PCI_DN(dn));
+#endif
+
+ pr_debug(" * %pOF\n", dn);
+ if (!of_device_is_available(dn))
+ return NULL;
+
+ reg = of_get_property(dn, "reg", &reglen);
+ if (reg == NULL || reglen < 20)
+ return NULL;
+ devfn = (of_read_number(reg, 1) >> 8) & 0xff;
+
+ /* Check if the PCI device is already there */
+ dev = pci_get_slot(bus, devfn);
+ if (dev) {
+ pci_dev_put(dev);
+ return dev;
+ }
+
+ /* Device removed permanently ? */
+#ifdef CONFIG_EEH
+ if (edev && (edev->mode & EEH_DEV_REMOVED))
+ return NULL;
+#endif
+
+ /* create a new pci_dev for this device */
+ dev = of_create_pci_dev(dn, bus, devfn);
+ if (!dev)
+ return NULL;
+
+ pr_debug(" dev header type: %x\n", dev->hdr_type);
+ return dev;
+}
+
/**
* __of_scan_bus - given a PCI bus node, setup bus and scan for child devices
* @node: device tree node for the PCI bus
@@ -302,25 +396,14 @@ static void __of_scan_bus(struct device_node *node, struct pci_bus *bus,
int rescan_existing)
{
struct device_node *child;
- const u32 *reg;
- int reglen, devfn;
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) {
- pr_debug(" * %s\n", child->full_name);
- if (!of_device_is_available(child))
- continue;
- reg = of_get_property(child, "reg", &reglen);
- if (reg == NULL || reglen < 20)
- continue;
- devfn = (reg[0] >> 8) & 0xff;
-
- /* create a new pci_dev for this device */
- dev = of_create_pci_dev(child, bus, devfn);
+ dev = of_scan_pci_dev(bus, child);
if (!dev)
continue;
pr_debug(" dev header type: %x\n", dev->hdr_type);
@@ -331,15 +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 (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
- dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
- 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 09:05:52 +0000