From: David S. Miller <davem@davemloft.net>
Date: Tue, 30 Aug 2011 04:14:29 +0000 (-0700)
Subject: sparc64: Only Panther cheetah+ chips have POPC.
X-Git-Tag: v4.14-rc1~13628^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1a8e0da5937a6c87807083baa318cf8f98dac9aa;p=platform%2Fkernel%2Flinux-rpi.git

sparc64: Only Panther cheetah+ chips have POPC.

Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index 3e9daea1653d..3c5bb784214f 100644
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -440,8 +440,14 @@ static void __init init_sparc64_elf_hwcap(void)
 			cap |= AV_SPARC_VIS;
 		if (tlb_type == cheetah || tlb_type == cheetah_plus)
 			cap |= AV_SPARC_VIS | AV_SPARC_VIS2;
-		if (tlb_type == cheetah_plus)
-			cap |= AV_SPARC_POPC;
+		if (tlb_type == cheetah_plus) {
+			unsigned long impl, ver;
+
+			__asm__ __volatile__("rdpr %%ver, %0" : "=r" (ver));
+			impl = ((ver >> 32) & 0xffff);
+			if (impl == PANTHER_IMPL)
+				cap |= AV_SPARC_POPC;
+		}
 		if (tlb_type == hypervisor) {
 			if (sun4v_chip_type == SUN4V_CHIP_NIAGARA1)
 				cap |= AV_SPARC_ASI_BLK_INIT;