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authorMarek Szyprowski <m.szyprowski@samsung.com>2014-07-14 10:28:04 +0200
committerGrant Likely <grant.likely@linaro.org>2014-08-01 12:22:21 -0600
commit9dcfee01930e6cc1e84d28c232664f0c19a1f86c (patch)
tree747884063ec2dfb1dda29f616d87ceb4d6211e04 /drivers
parent3069f0c07f8d64ebf6ff5d2d1553e0a6dad4316e (diff)
drivers: of: add automated assignment of reserved regions to client devices
This patch adds code for automated assignment of reserved memory regions to struct device. reserved_mem->ops->device_init()/device_cleanup() callbacks are called to perform reserved memory driver specific initialization and cleanup Based on previous code provided by Josh Cartwright <joshc@codeaurora.org> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Grant Likely <grant.likely@linaro.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/of/of_reserved_mem.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 632aae861375..59fb12e84e6b 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -206,8 +206,16 @@ void __init fdt_init_reserved_mem(void)
for (i = 0; i < reserved_mem_count; i++) {
struct reserved_mem *rmem = &reserved_mem[i];
unsigned long node = rmem->fdt_node;
+ int len;
+ const __be32 *prop;
int err = 0;
+ prop = of_get_flat_dt_prop(node, "phandle", &len);
+ if (!prop)
+ prop = of_get_flat_dt_prop(node, "linux,phandle", &len);
+ if (prop)
+ rmem->phandle = of_read_number(prop, len/4);
+
if (rmem->size == 0)
err = __reserved_mem_alloc_size(node, rmem->name,
&rmem->base, &rmem->size);
@@ -215,3 +223,65 @@ void __init fdt_init_reserved_mem(void)
__reserved_mem_init_node(rmem);
}
}
+
+static inline struct reserved_mem *__find_rmem(struct device_node *node)
+{
+ unsigned int i;
+
+ if (!node->phandle)
+ return NULL;
+
+ for (i = 0; i < reserved_mem_count; i++)
+ if (reserved_mem[i].phandle == node->phandle)
+ return &reserved_mem[i];
+ return NULL;
+}
+
+/**
+ * of_reserved_mem_device_init() - assign reserved memory region to given device
+ *
+ * This function assign memory region pointed by "memory-region" device tree
+ * property to the given device.
+ */
+void of_reserved_mem_device_init(struct device *dev)
+{
+ struct reserved_mem *rmem;
+ struct device_node *np;
+
+ np = of_parse_phandle(dev->of_node, "memory-region", 0);
+ if (!np)
+ return;
+
+ rmem = __find_rmem(np);
+ of_node_put(np);
+
+ if (!rmem || !rmem->ops || !rmem->ops->device_init)
+ return;
+
+ rmem->ops->device_init(rmem, dev);
+ dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
+}
+
+/**
+ * of_reserved_mem_device_release() - release reserved memory device structures
+ *
+ * This function releases structures allocated for memory region handling for
+ * the given device.
+ */
+void of_reserved_mem_device_release(struct device *dev)
+{
+ struct reserved_mem *rmem;
+ struct device_node *np;
+
+ np = of_parse_phandle(dev->of_node, "memory-region", 0);
+ if (!np)
+ return;
+
+ rmem = __find_rmem(np);
+ of_node_put(np);
+
+ if (!rmem || !rmem->ops || !rmem->ops->device_release)
+ return;
+
+ rmem->ops->device_release(rmem, dev);
+}