linux-kernel - [PATCH 1/9] ARC: timer: gfrc, rtc: Read BCR to detect whether hardware exists ...

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Message-ID: <1477954096-770-2-git-send-email-vgupta@synopsys.com>
Date:   Mon, 31 Oct 2016 15:48:08 -0700
From:   Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
CC:     <tglx@...utronix.de>, <linux-kernel@...r.kernel.org>,
        <linux-snps-arc@...ts.infradead.org>,
        Noam Camus <noamca@...lanox.com>,
        <Alexey.Brodkin@...opsys.com>,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>
Subject: [PATCH 1/9] ARC: timer: gfrc, rtc: Read BCR to detect whether hardware exists ...

... don't rely on cpuinfo populated in arc boot code. This paves wat for
moving this code in drivers/clocksource/

Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
---
 arch/arc/kernel/time.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/arc/kernel/time.c b/arch/arc/kernel/time.c
index f927b8dc6edd..a2db010cde18 100644
--- a/arch/arc/kernel/time.c
+++ b/arch/arc/kernel/time.c
@@ -118,10 +118,11 @@ static struct clocksource arc_counter_gfrc = {
 
 static int __init arc_cs_setup_gfrc(struct device_node *node)
 {
-	int exists = cpuinfo_arc700[0].extn.gfrc;
+	struct mcip_bcr mp;
 	int ret;
 
-	if (WARN(!exists, "Global-64-bit-Ctr clocksource not detected"))
+	READ_BCR(ARC_REG_MCIP_BCR, mp);
+	if (WARN(!mp.gfrc, "Global-64-bit-Ctr clocksource not detected"))
 		return -ENXIO;
 
 	ret = arc_get_timer_clk(node);
@@ -174,10 +175,11 @@ static struct clocksource arc_counter_rtc = {
 
 static int __init arc_cs_setup_rtc(struct device_node *node)
 {
-	int exists = cpuinfo_arc700[smp_processor_id()].extn.rtc;
+	struct bcr_timer timer;
 	int ret;
 
-	if (WARN(!exists, "Local-64-bit-Ctr clocksource not detected"))
+	READ_BCR(ARC_REG_TIMERS_BCR, timer);
+	if (WARN(!timer.rtc, "Local-64-bit-Ctr clocksource not detected"))
 		return -ENXIO;
 
 	/* Local to CPU hence not usable in SMP */
-- 
2.7.4