linux-kernel - [PATCH v2 3/3] clocksource/drivers/dw_apb_timer

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 3 Nov 2015 22:28:37 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	<daniel.lezcano@...aro.org>, <tglx@...utronix.de>,
	<linux@....linux.org.uk>, <arnd@...db.de>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Jisheng Zhang <jszhang@...vell.com>
Subject: [PATCH v2 3/3] clocksource/drivers/dw_apb_timer_of: Implement ARM delay timer

Implement an ARM delay timer to be used for udelay(). This allows us to
skip the delay loop calibration at boot on Marvell BG2, BG2Q, BG2CD
platforms. And after this patch, udelay() will be unaffected by CPU
frequency changes.

Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
---
 drivers/clocksource/dw_apb_timer_of.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/clocksource/dw_apb_timer_of.c b/drivers/clocksource/dw_apb_timer_of.c
index a19a3f6..7a6c3bf 100644
--- a/drivers/clocksource/dw_apb_timer_of.c
+++ b/drivers/clocksource/dw_apb_timer_of.c
@@ -16,6 +16,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+#include <linux/delay.h>
 #include <linux/dw_apb_timer.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
@@ -130,6 +131,18 @@ static void __init init_sched_clock(void)
 	sched_clock_register(read_sched_clock, 32, sched_rate);
 }
 
+#ifdef CONFIG_ARM
+static unsigned long dw_apb_delay_timer_read(void)
+{
+	return ~readl_relaxed(sched_io_base);
+}
+
+static struct delay_timer dw_apb_delay_timer = {
+	.read_current_timer	= dw_apb_delay_timer_read,
+	.rating			= 300,
+};
+#endif
+
 static int num_called;
 static void __init dw_apb_timer_init(struct device_node *timer)
 {
@@ -142,6 +155,10 @@ static void __init dw_apb_timer_init(struct device_node *timer)
 		pr_debug("%s: found clocksource timer\n", __func__);
 		add_clocksource(timer);
 		init_sched_clock();
+#ifdef CONFIG_ARM
+		dw_apb_delay_timer.freq = sched_rate;
+		register_current_timer_delay(&dw_apb_delay_timer);
+#endif
 		break;
 	default:
 		break;
-- 
2.6.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/