x86: dtb: Add support for PCI devices backed by dtb nodes

x86_of_pci_init() does two things:

- it provides a generic irq enable and disable function. enable queries
  the device tree for the interrupt information, calls ->xlate on the
  irq host and updates the pci->irq information for the device.

- it walks through PCI bus(es) in the device tree and adds its children
  (device) nodes to appropriate pci_dev nodes in kernel. So the dtb
  node information is available at probe time of the PCI device.

Adding a PCI bus based on the information in the device tree is
currently not supported. Right now direct access via ioports is used.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Cc: sodaville@linutronix.de
Cc: devicetree-discuss@lists.ozlabs.org
LKML-Reference: <1298405266-1624-8-git-send-email-bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2011-02-22 21:07:42 +01:00 committed by Thomas Gleixner
parent ffb9fc68df
commit 96e0a0797e
4 changed files with 99 additions and 1 deletions

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@ -16,6 +16,7 @@
#include <linux/of.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <asm/irq.h>
#include <asm/atomic.h>
@ -29,8 +30,21 @@ extern void add_dtb(u64 data);
void x86_dtb_find_config(void);
void x86_dtb_get_config(unsigned int unused);
void add_interrupt_host(struct irq_domain *ih);
void __cpuinit x86_of_pci_init(void);
static inline struct device_node *pci_device_to_OF_node(struct pci_dev *pdev)
{
return pdev ? pdev->dev.of_node : NULL;
}
static inline struct device_node *pci_bus_to_OF_node(struct pci_bus *bus)
{
return pci_device_to_OF_node(bus->self);
}
#else
static inline void add_dtb(u64 data) { }
static inline void x86_of_pci_init(void) { }
#define x86_dtb_find_config x86_init_noop
#define x86_dtb_get_config x86_init_uint_noop
#define of_ioapic 0

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@ -9,11 +9,15 @@
#include <linux/of_fdt.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/of_irq.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/of_pci.h>
#include <asm/hpet.h>
#include <asm/irq_controller.h>
#include <asm/apic.h>
#include <asm/pci_x86.h>
__initdata u64 initial_dtb;
char __initdata cmd_line[COMMAND_LINE_SIZE];
@ -99,6 +103,85 @@ void __init add_dtb(u64 data)
initial_dtb = data + offsetof(struct setup_data, data);
}
#ifdef CONFIG_PCI
static int x86_of_pci_irq_enable(struct pci_dev *dev)
{
struct of_irq oirq;
u32 virq;
int ret;
u8 pin;
ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
if (ret)
return ret;
if (!pin)
return 0;
ret = of_irq_map_pci(dev, &oirq);
if (ret)
return ret;
virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
oirq.size);
if (virq == 0)
return -EINVAL;
dev->irq = virq;
return 0;
}
static void x86_of_pci_irq_disable(struct pci_dev *dev)
{
}
void __cpuinit x86_of_pci_init(void)
{
struct device_node *np;
pcibios_enable_irq = x86_of_pci_irq_enable;
pcibios_disable_irq = x86_of_pci_irq_disable;
for_each_node_by_type(np, "pci") {
const void *prop;
struct pci_bus *bus;
unsigned int bus_min;
struct device_node *child;
prop = of_get_property(np, "bus-range", NULL);
if (!prop)
continue;
bus_min = be32_to_cpup(prop);
bus = pci_find_bus(0, bus_min);
if (!bus) {
printk(KERN_ERR "Can't find a node for bus %s.\n",
np->full_name);
continue;
}
if (bus->self)
bus->self->dev.of_node = np;
else
bus->dev.of_node = np;
for_each_child_of_node(np, child) {
struct pci_dev *dev;
u32 devfn;
prop = of_get_property(child, "reg", NULL);
if (!prop)
continue;
devfn = (be32_to_cpup(prop) >> 8) & 0xff;
dev = pci_get_slot(bus, devfn);
if (!dev)
continue;
dev->dev.of_node = child;
pci_dev_put(dev);
}
}
}
#endif
static void __init dtb_setup_hpet(void)
{
struct device_node *dn;

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@ -71,7 +71,7 @@ config OF_MDIO
config OF_PCI
def_tristate PCI
depends on PCI && (PPC || MICROBLAZE)
depends on PCI && (PPC || MICROBLAZE || X86)
help
OpenFirmware PCI bus accessors

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@ -1,5 +1,6 @@
#include <linux/kernel.h>
#include <linux/of_pci.h>
#include <linux/of_irq.h>
#include <asm/prom.h>
/**