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Date: Thu, 25 Nov 2010 18:39:57 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-kernel@...r.kernel.org
Cc: sodaville@...utronix.de, x86@...nel.org,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
devicetree-discuss@...ts.ozlabs.org
Subject: [PATCH 07/11] 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 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.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC: x86@...nel.org
Cc: devicetree-discuss@...ts.ozlabs.org
Tested-by: Dirk Brandewie <dirk.brandewie@...il.com>
---
arch/x86/include/asm/prom.h | 1 +
arch/x86/kernel/prom.c | 110 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 111 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/prom.h b/arch/x86/include/asm/prom.h
index b74a49f..794c6a1 100644
--- a/arch/x86/include/asm/prom.h
+++ b/arch/x86/include/asm/prom.h
@@ -28,6 +28,7 @@ extern void init_dtb(void);
extern void add_dtb(u64 data);
void x86_early_of_parse(void);
void add_interrupt_host(struct irq_host *ih);
+void __cpuinit x86_of_pci_init(void);
#else
static inline void init_dtb(void) { }
static inline void add_dtb(u64 data) { }
diff --git a/arch/x86/kernel/prom.c b/arch/x86/kernel/prom.c
index f61c541..c02777d 100644
--- a/arch/x86/kernel/prom.c
+++ b/arch/x86/kernel/prom.c
@@ -8,10 +8,12 @@
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/slab.h>
+#include <linux/pci.h>
#include <asm/hpet.h>
#include <asm/irq_controller.h>
#include <asm/io_apic.h>
+#include <asm/pci_x86.h>
char __initdata cmd_line[COMMAND_LINE_SIZE];
static LIST_HEAD(irq_hosts);
@@ -100,6 +102,114 @@ void __init add_dtb(u64 data)
offsetof(struct setup_data, data));
}
+static int of_irq_map_pci(struct pci_dev *dev, struct of_irq *oirq)
+{
+ struct device_node *node;
+ __be32 laddr[3];
+ __be32 lspec[2];
+ int ret;
+ u8 pin;
+
+ node = dev->dev.of_node;
+ if (!node) {
+ node = dev->bus->dev.of_node;
+ if (node) {
+ ret = of_irq_map_one(node, 0, oirq);
+ if (!ret)
+ return ret;
+ }
+ }
+
+ ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
+ if (ret)
+ return ret;
+ if (!pin)
+ return -EINVAL;
+
+ laddr[0] = cpu_to_be32((dev->bus->number << 16) | (dev->devfn << 8));
+ laddr[1] = 0;
+ laddr[2] = 0;
+
+ lspec[0] = cpu_to_be32(pin);
+ lspec[1] = cpu_to_be32(0);
+ ret = of_irq_map_raw(node, lspec, 1, laddr, oirq);
+ if (ret)
+ return ret;
+ return 0;
+}
+
+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 == NO_IRQ)
+ 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;
+ }
+
+ 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;
+ }
+ }
+}
+
static int __init early_scan_hpet(unsigned long node, const char *uname,
int depth, void *data)
{
--
1.7.3.2
--
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