Commit 96e0a079 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Thomas Gleixner
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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: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: default avatarDirk Brandewie <dirk.brandewie@gmail.com>
Acked-by: default avatarGrant 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: default avatarThomas Gleixner <tglx@linutronix.de>
parent ffb9fc68

arch/x86/include/asm/prom.h

+14 −0
Original line number Diff line number Diff line
@@ -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

arch/x86/kernel/devicetree.c

+83 −0
Original line number Diff line number Diff line
@@ -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;

drivers/of/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -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

drivers/of/of_pci.c

+1 −0
Original line number Diff line number Diff line 
#include <linux/kernel.h>

#include <linux/of_pci.h>

#include <linux/of_irq.h>

#include <asm/prom.h>



/**

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