Add a helper routine to map dcr's based on the "dcr-reg" property of
a device node.
Signed-off-by: Michael Ellerman <[EMAIL PROTECTED]>
---
arch/powerpc/sysdev/dcr.c | 17 +++++++++++++++++
include/asm-powerpc/dcr.h | 1 +
2 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/sysdev/dcr.c b/arch/powerpc/sysdev/dcr.c
index ab11c0b..da4f9c6 100644
--- a/arch/powerpc/sysdev/dcr.c
+++ b/arch/powerpc/sysdev/dcr.c
@@ -126,6 +126,23 @@ dcr_host_t dcr_map(struct device_node *dev, unsigned int
dcr_n,
}
EXPORT_SYMBOL_GPL(dcr_map);
+dcr_host_t dcr_map_reg(struct device_node *dev, unsigned int index)
+{
+ dcr_host_t ret = { .token = NULL };
+
+ unsigned int dcr_n, dcr_c;
+
+ dcr_n = dcr_resource_start(dev, index);
+ if (!dcr_n)
+ return ret;
+
+ dcr_c = dcr_resource_len(dev, index);
+ if (!dcr_c)
+ return ret;
+
+ return dcr_map(dev, dcr_n, dcr_c);
+}
+
void dcr_unmap(dcr_host_t host, unsigned int dcr_n, unsigned int dcr_c)
{
dcr_host_t h = host;
diff --git a/include/asm-powerpc/dcr.h b/include/asm-powerpc/dcr.h
index 9338d50..4d42f01 100644
--- a/include/asm-powerpc/dcr.h
+++ b/include/asm-powerpc/dcr.h
@@ -38,6 +38,7 @@ extern unsigned int dcr_resource_start(struct device_node *np,
unsigned int index);
extern unsigned int dcr_resource_len(struct device_node *np,
unsigned int index);
+extern dcr_host_t dcr_map_reg(struct device_node *np, unsigned int index);
#endif /* CONFIG_PPC_MERGE */
#endif /* CONFIG_PPC_DCR */
--
1.5.1.3.g7a33b
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