[PATCH 2/4] Revert "ARM: shmobile: sh73a0: Replace modify_scu_cpu_psr with scu_power_mode"

[Simon Horman]

This reverts commit e721295185535ed6ef4711eba156fbf5c24f9c5e.

The code changes the flags of the wrong cpus - which breaks the whole
bootup of secondary CPUs.

Cc: Bastian Hecht <hechtb at gmail.com>
Signed-off-by: Simon Horman <horms at verge.net.au>
---
 arch/arm/mach-shmobile/smp-sh73a0.c |   23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-shmobile/smp-sh73a0.c b/arch/arm/mach-shmobile/smp-sh73a0.c
index 96ddb97..624f00f 100644
--- a/arch/arm/mach-shmobile/smp-sh73a0.c
+++ b/arch/arm/mach-shmobile/smp-sh73a0.c
@@ -41,6 +41,9 @@ static void __iomem *scu_base_addr(void)
 	return (void __iomem *)0xf0000000;
 }
 
+static DEFINE_SPINLOCK(scu_lock);
+static unsigned long tmp;
+
 #ifdef CONFIG_HAVE_ARM_TWD
 static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, 0xf0000600, 29);
 void __init sh73a0_register_twd(void)
@@ -49,6 +52,20 @@ void __init sh73a0_register_twd(void)
 }
 #endif
 
+static void modify_scu_cpu_psr(unsigned long set, unsigned long clr)
+{
+	void __iomem *scu_base = scu_base_addr();
+
+	spin_lock(&scu_lock);
+	tmp = __raw_readl(scu_base + 8);
+	tmp &= ~clr;
+	tmp |= set;
+	spin_unlock(&scu_lock);
+
+	/* disable cache coherency after releasing the lock */
+	__raw_writel(tmp, scu_base + 8);
+}
+
 static unsigned int __init sh73a0_get_core_count(void)
 {
 	void __iomem *scu_base = scu_base_addr();
@@ -66,7 +83,7 @@ static int __cpuinit sh73a0_boot_secondary(unsigned int cpu, struct task_struct
 	cpu = cpu_logical_map(cpu);
 
 	/* enable cache coherency */
-	scu_power_mode(scu_base_addr(), 0);
+	modify_scu_cpu_psr(0, 3 << (cpu * 8));
 
 	if (((__raw_readl(PSTR) >> (4 * cpu)) & 3) == 3)
 		__raw_writel(1 << cpu, WUPCR);	/* wake up */
@@ -78,6 +95,8 @@ static int __cpuinit sh73a0_boot_secondary(unsigned int cpu, struct task_struct
 
 static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
 {
+	int cpu = cpu_logical_map(0);
+
 	scu_enable(scu_base_addr());
 
 	/* Map the reset vector (in headsmp.S) */
@@ -85,7 +104,7 @@ static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
 	__raw_writel(__pa(shmobile_secondary_vector), SBAR);
 
 	/* enable cache coherency on CPU0 */
-	scu_power_mode(scu_base_addr(), 0);
+	modify_scu_cpu_psr(0, 3 << (cpu * 8));
 }
 
 static void __init sh73a0_smp_init_cpus(void)
-- 
1.7.10.4