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Message-ID: <1397660267-23198-1-git-send-email-johannes.thumshirn@men.de>
Date: Wed, 16 Apr 2014 16:57:47 +0200
From: Johannes Thumshirn <johannes.thumshirn@....de>
To: <linux-kernel@...r.kernel.org>
CC: Johannes Thumshirn <Johannes.Thumshirn@....de>,
Thomas Schnuerer <thomas.schnuerer@....de>,
Johannes Thumshirn <johannes.thumshirn@....de>
Subject: [PATCH] mcb: Add support for shared PCI IRQs
Add support for shared PCI IRQs to mcb and mcb-pci.
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@....de>
---
drivers/mcb/mcb-core.c | 20 +++++++++++++++-----
drivers/mcb/mcb-pci.c | 17 ++++++++++++++++-
include/linux/mcb.h | 6 +++++-
3 files changed, 36 insertions(+), 7 deletions(-)
diff --git a/drivers/mcb/mcb-core.c b/drivers/mcb/mcb-core.c
index bbe1293..9018ab8 100644
--- a/drivers/mcb/mcb-core.c
+++ b/drivers/mcb/mcb-core.c
@@ -183,14 +183,14 @@ EXPORT_SYMBOL_GPL(mcb_device_register);
*
* Allocate a new @mcb_bus.
*/
-struct mcb_bus *mcb_alloc_bus(void)
+struct mcb_bus *mcb_alloc_bus(struct device *carrier)
{
struct mcb_bus *bus;
int bus_nr;
bus = kzalloc(sizeof(struct mcb_bus), GFP_KERNEL);
if (!bus)
- return NULL;
+ return ERR_PTR(-ENOMEM);
bus_nr = ida_simple_get(&mcb_ida, 0, 0, GFP_KERNEL);
if (bus_nr < 0) {
@@ -200,7 +200,7 @@ struct mcb_bus *mcb_alloc_bus(void)
INIT_LIST_HEAD(&bus->children);
bus->bus_nr = bus_nr;
-
+ bus->carrier = carrier;
return bus;
}
EXPORT_SYMBOL_GPL(mcb_alloc_bus);
@@ -378,6 +378,13 @@ void mcb_release_mem(struct resource *mem)
}
EXPORT_SYMBOL_GPL(mcb_release_mem);
+static int __mcb_get_irq(struct mcb_device *dev)
+{
+ struct resource *irq = &dev->irq;
+
+ return irq->start;
+}
+
/**
* mcb_get_irq() - Get device's IRQ number
* @dev: The @mcb_device the IRQ is for
@@ -386,9 +393,12 @@ EXPORT_SYMBOL_GPL(mcb_release_mem);
*/
int mcb_get_irq(struct mcb_device *dev)
{
- struct resource *irq = &dev->irq;
+ struct mcb_bus *bus = dev->bus;
- return irq->start;
+ if (bus->get_irq)
+ return bus->get_irq(dev);
+
+ return __mcb_get_irq(dev);
}
EXPORT_SYMBOL_GPL(mcb_get_irq);
diff --git a/drivers/mcb/mcb-pci.c b/drivers/mcb/mcb-pci.c
index 99c742c..b591819 100644
--- a/drivers/mcb/mcb-pci.c
+++ b/drivers/mcb/mcb-pci.c
@@ -20,6 +20,15 @@ struct priv {
void __iomem *base;
};
+static int mcb_pci_get_irq(struct mcb_device *mdev)
+{
+ struct mcb_bus *mbus = mdev->bus;
+ struct device *dev = mbus->carrier;
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+ return pdev->irq;
+}
+
static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct priv *priv;
@@ -67,7 +76,13 @@ static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
pci_set_drvdata(pdev, priv);
- priv->bus = mcb_alloc_bus();
+ priv->bus = mcb_alloc_bus(&pdev->dev);
+ if (IS_ERR(priv->bus)) {
+ ret = PTR_ERR(priv->bus);
+ goto err_drvdata;
+ }
+
+ priv->bus->get_irq = mcb_pci_get_irq;
ret = chameleon_parse_cells(priv->bus, mapbase, priv->base);
if (ret < 0)
diff --git a/include/linux/mcb.h b/include/linux/mcb.h
index 2db284d..ed06e15 100644
--- a/include/linux/mcb.h
+++ b/include/linux/mcb.h
@@ -16,6 +16,7 @@
#include <linux/irqreturn.h>
struct mcb_driver;
+struct mcb_device;
/**
* struct mcb_bus - MEN Chameleon Bus
@@ -23,11 +24,14 @@ struct mcb_driver;
* @dev: pointer to carrier device
* @children: the child busses
* @bus_nr: mcb bus number
+ * @get_irq: callback to get IRQ number
*/
struct mcb_bus {
struct list_head children;
struct device dev;
+ struct device *carrier;
int bus_nr;
+ int (*get_irq)(struct mcb_device *dev);
};
#define to_mcb_bus(b) container_of((b), struct mcb_bus, dev)
@@ -105,7 +109,7 @@ extern void mcb_unregister_driver(struct mcb_driver *driver);
module_driver(__mcb_driver, mcb_register_driver, mcb_unregister_driver);
extern void mcb_bus_add_devices(const struct mcb_bus *bus);
extern int mcb_device_register(struct mcb_bus *bus, struct mcb_device *dev);
-extern struct mcb_bus *mcb_alloc_bus(void);
+extern struct mcb_bus *mcb_alloc_bus(struct device *carrier);
extern struct mcb_bus *mcb_bus_get(struct mcb_bus *bus);
extern void mcb_bus_put(struct mcb_bus *bus);
extern struct mcb_device *mcb_alloc_dev(struct mcb_bus *bus);
--
1.9.2
--
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