ARM: mvebu: ll_set_cpu_coherent always uses the current CPU

ll_set_cpu_coherent is always used on the current CPU, so instead of
passing the CPU id as argument, ll_set_cpu_coherent() can find it by
itself.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Link: https://lkml.kernel.org/r/1397488214-20685-4-git-send-email-gregory.clement@free-electrons.com
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

arch/arm/mach-mvebu/coherency.c

@@ -61,17 +61,17 @@ static struct of_device_id of_coherency_table[] = {
 };
 
 /* Function defined in coherency_ll.S */
-int ll_set_cpu_coherent(unsigned int hw_cpu_id);
+int ll_set_cpu_coherent(void);
 
-int set_cpu_coherent(unsigned int hw_cpu_id, int smp_group_id)
+int set_cpu_coherent(int smp_group_id)
 {
 	if (!coherency_base) {
-		pr_warn("Can't make CPU %d cache coherent.\n", hw_cpu_id);
+		pr_warn("Can't make current CPU cache coherent.\n");
 		pr_warn("Coherency fabric is not initialized\n");
 		return 1;
 	}
 
-	return ll_set_cpu_coherent(hw_cpu_id);
+	return ll_set_cpu_coherent();
 }
 
 /*
@@ -302,7 +302,7 @@ static void __init armada_370_coherency_init(struct device_node *np)
 	sync_cache_w(&coherency_phys_base);
 	coherency_base = of_iomap(np, 0);
 	coherency_cpu_base = of_iomap(np, 1);
-	set_cpu_coherent(cpu_logical_map(smp_processor_id()), 0);
+	set_cpu_coherent(0);
 }
 
 static void __init armada_375_380_coherency_init(struct device_node *np)
@@ -330,8 +330,6 @@ static int coherency_type(void)
 		/* Armada 380 coherency works only on SMP */
 		else if (type == COHERENCY_FABRIC_TYPE_ARMADA_380 && is_smp())
 			return type;
-
-		of_node_put(np);
 	}
 
 	return COHERENCY_FABRIC_TYPE_NONE;

arch/arm/mach-mvebu/coherency.h

@@ -16,7 +16,7 @@
 
 extern unsigned long coherency_phys_base;
 
-int set_cpu_coherent(unsigned int cpu_id, int smp_group_id);
+int set_cpu_coherent(int smp_group_id);
 int coherency_init(void);
 int coherency_available(void);
 

arch/arm/mach-mvebu/coherency_ll.S

@@ -24,9 +24,7 @@
 #include <asm/cp15.h>
 
 	.text
-/*
- * r0: HW CPU id
- */
+
 ENTRY(ll_set_cpu_coherent)
 	mrc	p15, 0, r1, c1, c0, 0
 	tst	r1, #CR_M @ Check MMU bit enabled
@@ -43,8 +41,10 @@ ENTRY(ll_set_cpu_coherent)
 	ldr	r0, [r0]
 2:
 	/* Create bit by cpu index */
-	mov	r3, #(1 << 24)
-	lsl	r1, r3, r1
+	mrc	15, 0, r1, cr0, cr0, 5
+	and	r1, r1, #15
+	mov	r2, #(1 << 24)
+	lsl	r1, r2, r1
 ARM_BE8(rev	r1, r1)
 
 	/* Add CPU to SMP group - Atomic */

arch/arm/mach-mvebu/headsmp.S

@@ -31,10 +31,6 @@
 ENTRY(armada_xp_secondary_startup)
  ARM_BE8(setend	be )			@ go BE8 if entered LE
 
-	/* Read CPU id */
-	mrc     p15, 0, r1, c0, c0, 5
-	and     r1, r1, #0xF
-
 	/* Add CPU to coherency fabric */
 	bl	ll_set_cpu_coherent
 	b	secondary_startup

arch/arm/mach-mvebu/platsmp.c

@@ -103,7 +103,7 @@ static void __init armada_xp_smp_prepare_cpus(unsigned int max_cpus)
 
 	set_secondary_cpus_clock();
 	flush_cache_all();
-	set_cpu_coherent(cpu_logical_map(smp_processor_id()), 0);
+	set_cpu_coherent(0);
 
 	/*
 	 * In order to boot the secondary CPUs we need to ensure