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[RFC,v2,03/15] ARM: DT/kernel: define ARM specific arch_match_cpu_phys_id

Message ID 1374069984-20567-4-git-send-email-Sudeep.KarkadaNagesha@arm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Sudeep KarkadaNagesha July 17, 2013, 2:06 p.m. UTC 
From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>

OF/DT core library now provides architecture specific hook to match the
logical cpu index with the corresponding physical identifier. Most of the
cpu DT node parsing and initialisation is contained in devtree.c. So it's
better to define ARM specific arch_match_cpu_phys_id there.

This mainly helps to avoid replication of the code doing CPU node parsing
and physical(MPIDR) to logical mapping.

Cc: Russell King <linux@arm.linux.org.uk>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
---
 arch/arm/kernel/devtree.c | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c
index 5859c8b..5a36f32 100644
--- a/arch/arm/kernel/devtree.c
+++ b/arch/arm/kernel/devtree.c
@@ -169,6 +169,11 @@  void __init arm_dt_init_cpu_maps(void)
 	}
 }
 
+int arch_match_cpu_phys_id(int cpu, u64 phys_id)
+{
+	return (phys_id & MPIDR_HWID_BITMASK) == cpu_logical_map(cpu);
+}
+
 /**
  * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
  * @dt_phys: physical address of dt blob