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authorMichael Ellerman <michael@ellerman.id.au>2006-08-16 22:04:14 +1000
committerPaul Mackerras <paulus@samba.org>2006-08-25 13:27:35 +1000
commit6f3d5d3cc4b1447578ae8484166bbc34a64150c5 (patch)
tree3641fb3b82081252fcb67cb8d2c66eb4d877e25c /include
parenta0a428e30077fd64c39aadf5221cf2c7a14dc281 (diff)
[POWERPC] Add a helper for calculating RTAS "config_addr" parameters
Several RTAS calls take a "config_addr" parameter, which is a particular way of specifying a PCI busno, devfn and register number into a 32-bit word. Currently these are open-coded, and I'll be adding another soon, replace them with a helper that encapsulates the logic. Be more strict about masking the busno too, just in case. Booted on P5 LPAR. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-powerpc/rtas.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/asm-powerpc/rtas.h b/include/asm-powerpc/rtas.h
index 82a27e9a041..d34f9e1f242 100644
--- a/include/asm-powerpc/rtas.h
+++ b/include/asm-powerpc/rtas.h
@@ -230,5 +230,21 @@ extern unsigned long rtas_rmo_buf;
#define GLOBAL_INTERRUPT_QUEUE 9005
+/**
+ * rtas_config_addr - Format a busno, devfn and reg for RTAS.
+ * @busno: The bus number.
+ * @devfn: The device and function number as encoded by PCI_DEVFN().
+ * @reg: The register number.
+ *
+ * This function encodes the given busno, devfn and register number as
+ * required for RTAS calls that take a "config_addr" parameter.
+ * See PAPR requirement 7.3.4-1 for more info.
+ */
+static inline u32 rtas_config_addr(int busno, int devfn, int reg)
+{
+ return ((reg & 0xf00) << 20) | ((busno & 0xff) << 16) |
+ (devfn << 8) | (reg & 0xff);
+}
+
#endif /* __KERNEL__ */
#endif /* _POWERPC_RTAS_H */