From: Michal Simek <michal.simek@xilinx.com>
Date: Fri, 24 May 2013 15:58:55 +0000 (+0200)
Subject: ARM: zynq: Not to rewrite jump code when starting address is 0x0
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=88cd4e882de73c2e62c38591abfe8c13fcc8386a;p=linux-beck.git

ARM: zynq: Not to rewrite jump code when starting address is 0x0

This configuration is used by remoteproc.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---

diff --git a/arch/arm/mach-zynq/platsmp.c b/arch/arm/mach-zynq/platsmp.c
index 5fc167e07619..023f225493f2 100644
--- a/arch/arm/mach-zynq/platsmp.c
+++ b/arch/arm/mach-zynq/platsmp.c
@@ -53,34 +53,34 @@ int __cpuinit zynq_cpun_start(u32 address, int cpu)
 						&zynq_secondary_trampoline;
 
 		zynq_slcr_cpu_stop(cpu);
-
-		if (__pa(PAGE_OFFSET)) {
-			zero = ioremap(0, trampoline_code_size);
-			if (!zero) {
-				pr_warn("BOOTUP jump vectors not accessible\n");
-				return -1;
+		if (address) {
+			if (__pa(PAGE_OFFSET)) {
+				zero = ioremap(0, trampoline_code_size);
+				if (!zero) {
+					pr_warn("BOOTUP jump vectors not accessible\n");
+					return -1;
+				}
+			} else {
+				zero = (__force u8 __iomem *)PAGE_OFFSET;
 			}
-		} else {
-			zero = (__force u8 __iomem *)PAGE_OFFSET;
-		}
-
-		/*
-		 * This is elegant way how to jump to any address
-		 * 0x0: Load address at 0x8 to r0
-		 * 0x4: Jump by mov instruction
-		 * 0x8: Jumping address
-		 */
-		memcpy((__force void *)zero, &zynq_secondary_trampoline,
-						trampoline_size);
-		writel(address, zero + trampoline_size);
-
-		flush_cache_all();
-		outer_flush_range(0, trampoline_code_size);
-		smp_wmb();
-
-		if (__pa(PAGE_OFFSET))
-			iounmap(zero);
 
+			/*
+			* This is elegant way how to jump to any address
+			* 0x0: Load address at 0x8 to r0
+			* 0x4: Jump by mov instruction
+			* 0x8: Jumping address
+			*/
+			memcpy((__force void *)zero, &zynq_secondary_trampoline,
+							trampoline_size);
+			writel(address, zero + trampoline_size);
+
+			flush_cache_all();
+			outer_flush_range(0, trampoline_code_size);
+			smp_wmb();
+
+			if (__pa(PAGE_OFFSET))
+				iounmap(zero);
+		}
 		zynq_slcr_cpu_start(cpu);
 
 		return 0;