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Subject[PATCH TIP 08/14] x86/dtb: add support for PCI devices backed by dtb nodes
Date
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 buss(es) in the device tree and adds its children
(devices) 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.

Cc: devicetree-discuss@lists.ozlabs.org
Tested-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
arch/x86/include/asm/prom.h | 17 +++++++++
arch/x86/kernel/prom.c | 82 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 99 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/prom.h b/arch/x86/include/asm/prom.h
index bd67ab2..3ed0bd6 100644
--- a/arch/x86/include/asm/prom.h
+++ b/arch/x86/include/asm/prom.h
@@ -16,6 +16,7 @@

#include <linux/of.h>
#include <linux/types.h>
+#include <linux/pci.h>
#include <asm/irq.h>
#include <asm/atomic.h>
#include <asm/setup.h>
@@ -28,8 +29,24 @@ 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->dev.of_node;
+}
+
+static inline struct device_node *pci_bus_to_OF_node(struct pci_bus *bus)
+{
+ if (bus->self)
+ return pci_device_to_OF_node(bus->self);
+ else
+ return NULL;
+}
+
#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
diff --git a/arch/x86/kernel/prom.c b/arch/x86/kernel/prom.c
index 16c124e..8525ca0 100644
--- a/arch/x86/kernel/prom.c
+++ b/arch/x86/kernel/prom.c
@@ -9,10 +9,13 @@
#include <linux/of_address.h>
#include <linux/of_platform.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/io_apic.h>
+#include <asm/pci_x86.h>

__initdata u64 initial_dtb;
char __initdata cmd_line[COMMAND_LINE_SIZE];
@@ -99,6 +102,85 @@ 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;
--
1.7.3.2


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