Skip to content

Commit

Permalink
[POWERPC] Generic OF platform driver for PCI host bridges.
Browse files Browse the repository at this point in the history
When enabled in Kconfig, it will pick up any of_platform_device
matching it's match list (currently type "pci", "pcix", "pcie",
or "ht" and setup a PHB for it.

Platform must provide a ppc_md.pci_setup_phb() for it to work
(for doing the necessary initialisations specific to a given PHB
like setting up the config space ops).

It's currently only available on 64 bits as the 32 bits PCI code
can't quite cope with it in it's current form. I will fix that
later.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
  • Loading branch information
Benjamin Herrenschmidt authored and Paul Mackerras committed Dec 4, 2006
1 parent 803d457 commit 4c9d280
Show file tree
Hide file tree
Showing 8 changed files with 134 additions and 10 deletions.
6 changes: 6 additions & 0 deletions arch/powerpc/Kconfig
Original file line number Diff line number Diff line change
Expand Up @@ -223,6 +223,11 @@ config PPC_DCR
depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
default y

config PPC_OF_PLATFORM_PCI
bool
depends on PPC64 # not supported on 32 bits yet
default n

config BOOKE
bool
depends on E200 || E500
Expand Down Expand Up @@ -469,6 +474,7 @@ config PPC_CELL_NATIVE
bool
select PPC_CELL
select PPC_DCR_MMIO
select PPC_OF_PLATFORM_PCI
select MPIC
default n

Expand Down
103 changes: 103 additions & 0 deletions arch/powerpc/kernel/of_platform.c
Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
/*
* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
* <benh@kernel.crashing.org>
* and Arnd Bergmann, IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
Expand All @@ -17,12 +18,15 @@
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <linux/pci.h>

#include <asm/errno.h>
#include <asm/dcr.h>
#include <asm/of_device.h>
#include <asm/of_platform.h>
#include <asm/topology.h>
#include <asm/pci-bridge.h>
#include <asm/ppc-pci.h>

/*
* The list of OF IDs below is used for matching bus types in the
Expand Down Expand Up @@ -377,3 +381,102 @@ struct of_device *of_find_device_by_phandle(phandle ph)
return NULL;
}
EXPORT_SYMBOL(of_find_device_by_phandle);


#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 __devinit of_pci_phb_probe(struct of_device *dev,
const struct of_device_id *match)
{
struct pci_controller *phb;

/* Check if we can do that ... */
if (ppc_md.pci_setup_phb == NULL)
return -ENODEV;

printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name);

/* Alloc and setup PHB data structure */
phb = pcibios_alloc_controller(dev->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->node, 0);

/* Setup IO space.
* This will not work properly for ISA IOs, something needs to be done
* about it if we ever generalize that way of probing PCI brigdes
*/
pci_setup_phb_io_dynamic(phb, 0);

/* Init pci_dn data structures */
pci_devs_phb_init_dynamic(phb);

/* Register devices with EEH */
#ifdef CONFIG_EEH
if (dev->node->child)
eeh_add_device_tree_early(dev->node);
#endif /* CONFIG_EEH */

/* Scan the bus */
scan_phb(phb);

/* Claim resources. This might need some rework as well depending
* wether we are doing probe-only or not, like assigning unassigned
* resources etc...
*/
pcibios_claim_one_bus(phb->bus);

/* Finish EEH setup */
#ifdef CONFIG_EEH
eeh_add_device_tree_late(phb->bus);
#endif

/* Add probed PCI devices to the device model */
pci_bus_add_devices(phb->bus);

return 0;
}

static struct of_device_id of_pci_phb_ids[] = {
{ .type = "pci", },
{ .type = "pcix", },
{ .type = "pcie", },
{ .type = "pciex", },
{ .type = "ht", },
{}
};

static struct of_platform_driver of_pci_phb_driver = {
.name = "of-pci",
.match_table = of_pci_phb_ids,
.probe = of_pci_phb_probe,
.driver = {
.multithread_probe = 1,
},
};

static __init int of_pci_phb_init(void)
{
return of_register_platform_driver(&of_pci_phb_driver);
}

device_initcall(of_pci_phb_init);

#endif /* CONFIG_PPC_OF_PLATFORM_PCI */
9 changes: 9 additions & 0 deletions arch/powerpc/kernel/pci_64.c
Original file line number Diff line number Diff line change
Expand Up @@ -210,6 +210,10 @@ struct pci_controller * pcibios_alloc_controller(struct device_node *dev)

void pcibios_free_controller(struct pci_controller *phb)
{
spin_lock(&hose_spinlock);
list_del(&phb->list_node);
spin_unlock(&hose_spinlock);

if (phb->is_dynamic)
kfree(phb);
}
Expand Down Expand Up @@ -1242,6 +1246,11 @@ static void __devinit do_bus_setup(struct pci_bus *bus)
void __devinit pcibios_fixup_bus(struct pci_bus *bus)
{
struct pci_dev *dev = bus->self;
struct device_node *np;

np = pci_bus_to_OF_node(bus);

DBG("pcibios_fixup_bus(%s)\n", np ? np->full_name : "<???>");

if (dev && pci_probe_only &&
(dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
Expand Down
7 changes: 4 additions & 3 deletions arch/powerpc/kernel/rtas_pci.c
Original file line number Diff line number Diff line change
Expand Up @@ -257,8 +257,10 @@ static int phb_set_bus_ranges(struct device_node *dev,
return 0;
}

int __devinit setup_phb(struct device_node *dev, struct pci_controller *phb)
int __devinit rtas_setup_phb(struct pci_controller *phb)
{
struct device_node *dev = phb->arch_data;

if (is_python(dev))
python_countermeasures(dev);

Expand Down Expand Up @@ -290,7 +292,7 @@ unsigned long __init find_and_init_phbs(void)
phb = pcibios_alloc_controller(node);
if (!phb)
continue;
setup_phb(node, phb);
rtas_setup_phb(phb);
pci_process_bridge_OF_ranges(phb, node, 0);
pci_setup_phb_io(phb, index == 0);
index++;
Expand Down Expand Up @@ -362,7 +364,6 @@ int pcibios_remove_root_bus(struct pci_controller *phb)
}
}

list_del(&phb->list_node);
pcibios_free_controller(phb);

return 0;
Expand Down
1 change: 1 addition & 0 deletions arch/powerpc/platforms/cell/setup.c
Original file line number Diff line number Diff line change
Expand Up @@ -256,6 +256,7 @@ define_machine(cell) {
.check_legacy_ioport = cell_check_legacy_ioport,
.progress = cell_progress,
.init_IRQ = cell_init_irq,
.pci_setup_phb = rtas_setup_phb,
#ifdef CONFIG_KEXEC
.machine_kexec = default_machine_kexec,
.machine_kexec_prepare = default_machine_kexec_prepare,
Expand Down
2 changes: 1 addition & 1 deletion arch/powerpc/platforms/pseries/pci_dlpar.c
Original file line number Diff line number Diff line change
Expand Up @@ -195,7 +195,7 @@ struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
phb = pcibios_alloc_controller(dn);
if (!phb)
return NULL;
setup_phb(dn, phb);
rtas_setup_phb(phb);
pci_process_bridge_OF_ranges(phb, dn, 0);

pci_setup_phb_io_dynamic(phb, primary);
Expand Down
4 changes: 4 additions & 0 deletions include/asm-powerpc/machdep.h
Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@ struct device_node;
struct iommu_table;
struct rtc_time;
struct file;
struct pci_controller;
#ifdef CONFIG_KEXEC
struct kimage;
#endif
Expand Down Expand Up @@ -107,6 +108,9 @@ struct machdep_calls {
int (*pci_probe_mode)(struct pci_bus *);
void (*pci_irq_fixup)(struct pci_dev *dev);

/* To setup PHBs when using automatic OF platform driver for PCI */
int (*pci_setup_phb)(struct pci_controller *host);

void (*restart)(char *cmd);
void (*power_off)(void);
void (*halt)(void);
Expand Down
12 changes: 6 additions & 6 deletions include/asm-powerpc/ppc-pci.h
Original file line number Diff line number Diff line change
Expand Up @@ -36,14 +36,14 @@ typedef void *(*traverse_func)(struct device_node *me, void *data);
void *traverse_pci_devices(struct device_node *start, traverse_func pre,
void *data);

void pci_devs_phb_init(void);
void pci_devs_phb_init_dynamic(struct pci_controller *phb);
int setup_phb(struct device_node *dev, struct pci_controller *phb);
void __devinit scan_phb(struct pci_controller *hose);
extern void pci_devs_phb_init(void);
extern void pci_devs_phb_init_dynamic(struct pci_controller *phb);
extern void scan_phb(struct pci_controller *hose);

/* From rtas_pci.h */
void init_pci_config_tokens (void);
unsigned long get_phb_buid (struct device_node *);
extern void init_pci_config_tokens (void);
extern unsigned long get_phb_buid (struct device_node *);
extern int rtas_setup_phb(struct pci_controller *phb);

/* From pSeries_pci.h */
extern void pSeries_final_fixup(void);
Expand Down

0 comments on commit 4c9d280

Please sign in to comment.