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Subject[RFC PATCH 2/5] drivers/amba: probe via device tree
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From: Jeremy Kerr <jeremy.kerr@canonical.com>

Add functions to parse the AMBA bus through the device tree.

Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
---
drivers/amba/bus.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++
include/linux/amba/bus.h | 5 +++
2 files changed, 72 insertions(+), 0 deletions(-)

diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index e7df019..e753fa9 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -13,6 +13,10 @@
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
#include <linux/amba/bus.h>

#include <asm/irq.h>
@@ -486,3 +490,66 @@ EXPORT_SYMBOL(amba_device_unregister);
EXPORT_SYMBOL(amba_find_device);
EXPORT_SYMBOL(amba_request_regions);
EXPORT_SYMBOL(amba_release_regions);
+
+#ifdef CONFIG_OF
+static int of_amba_device_create(struct device_node *node,struct device *parent)
+{
+ struct amba_device *dev;
+ const void *prop;
+ int i, ret;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ /* setup generic device info */
+ dev->dev.coherent_dma_mask = ~0;
+ dev->dev.of_node = node;
+ dev->dev.parent = parent;
+ of_device_make_bus_id(&dev->dev);
+
+ /* setup amba-specific device info */
+ dev->dma_mask = ~0;
+
+ /* Decode the IRQs and address ranges */
+ for (i = 0; i < AMBA_NR_IRQS; i++)
+ dev->irq[i] = irq_of_parse_and_map(node, i);
+
+ ret = of_address_to_resource(node, 0, &dev->res);
+ if (ret)
+ goto err_free;
+
+ ret = amba_device_register(dev, &iomem_resource);
+ if (ret)
+ goto err_free;
+
+ /* Sanity check the arm,amba-deviceid value */
+ prop = of_get_property(node, "arm,amba-deviceid", NULL);
+ if (!prop)
+ dev_warn(&dev->dev, "arm,amba-deviceid property missing; "
+ "probe gives 0x%08x.\n", dev->periphid);
+
+ if (prop && (dev->periphid != of_read_ulong(prop, 1)))
+ dev_warn(&dev->dev, "arm,amba-deviceid value (0x%08lx) and "
+ "probed value (0x%08x) don't agree.",
+ of_read_ulong(prop, 1), dev->periphid);
+
+ return 0;
+
+err_free:
+ kfree(dev);
+ return ret;
+}
+
+void of_amba_bus_populate(struct device_node *node, struct device *parent)
+{
+ struct device_node *child;
+
+ for_each_child_of_node(node, child) {
+ if (of_device_is_compatible(child, "arm,amba-device"))
+ of_amba_device_create(child, parent);
+ }
+}
+EXPORT_SYMBOL(of_amba_bus_populate);
+
+#endif /* CONFIG_OF */
diff --git a/include/linux/amba/bus.h b/include/linux/amba/bus.h
index 9e7f259..4baa4cf 100644
--- a/include/linux/amba/bus.h
+++ b/include/linux/amba/bus.h
@@ -90,4 +90,9 @@ void amba_release_regions(struct amba_device *);
#define amba_manf(d) AMBA_MANF_BITS((d)->periphid)
#define amba_part(d) AMBA_PART_BITS((d)->periphid)

+#ifdef CONFIG_OF
+struct device_node;
+void of_amba_bus_populate(struct device_node *node, struct device *parent);
+#endif
+
#endif


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