From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753702AbbJFPjG (ORCPT ); Tue, 6 Oct 2015 11:39:06 -0400 Received: from mail1.bemta8.messagelabs.com ([216.82.243.202]:58108 "EHLO mail1.bemta8.messagelabs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753113AbbJFPjD (ORCPT ); Tue, 6 Oct 2015 11:39:03 -0400 X-Greylist: delayed 399 seconds by postgrey-1.27 at vger.kernel.org; Tue, 06 Oct 2015 11:39:03 EDT X-Env-Sender: Marc_Gonzalez@sigmadesigns.com X-Msg-Ref: server-8.tower-220.messagelabs.com!1444144221!11658360!1 X-Originating-IP: [195.215.56.170] X-StarScan-Received: X-StarScan-Version: 6.13.16; banners=-,-,- X-VirusChecked: Checked To: Daniel Lezcano , Thomas Gleixner CC: LKML , Mans Rullgard , Mason From: Marc Gonzalez Subject: [PATCH v1] clocksource: Sigma Designs Tango 27 MHz xtal Message-ID: <5613E45C.5020208@sigmadesigns.com> Date: Tue, 6 Oct 2015 17:10:20 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0 SeaMonkey/2.35 MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: 7bit X-Originating-IP: [172.27.0.114] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Date: Tue, 6 Oct 2015 16:49:28 +0200 Subject: [PATCH] clocksource: Sigma Designs Tango 27 MHz xtal Sigma Designs Tango platforms provide a 27 MHz crystal oscillator. Use it for clocksource, sched_clock, and delay_timer. Signed-off-by: Marc Gonzalez --- drivers/clocksource/Makefile | 1 + drivers/clocksource/tango_xtal.c | 46 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 47 insertions(+) create mode 100644 drivers/clocksource/tango_xtal.c diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile index f228354961ca..46e405673d75 100644 --- a/drivers/clocksource/Makefile +++ b/drivers/clocksource/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_ARCH_CLPS711X) += clps711x-timer.o obj-$(CONFIG_ARCH_ATLAS7) += timer-atlas7.o obj-$(CONFIG_ARCH_MOXART) += moxart_timer.o obj-$(CONFIG_ARCH_MXS) += mxs_timer.o +obj-$(CONFIG_ARCH_TANGOX) += tango_xtal.o obj-$(CONFIG_CLKSRC_PXA) += pxa_timer.o obj-$(CONFIG_ARCH_PRIMA2) += timer-prima2.o obj-$(CONFIG_ARCH_U300) += timer-u300.o diff --git a/drivers/clocksource/tango_xtal.c b/drivers/clocksource/tango_xtal.c new file mode 100644 index 000000000000..0f2fb293ab75 --- /dev/null +++ b/drivers/clocksource/tango_xtal.c @@ -0,0 +1,46 @@ +#include +#include +#include +#include +#include + +static void __iomem *xtal_in_cnt; +static struct delay_timer delay_timer; + +static unsigned long read_xtal_counter(void) +{ + return readl_relaxed(xtal_in_cnt); +} + +static u64 read_sched_clock(void) +{ + return read_xtal_counter(); +} + +static cycle_t read_clocksource(struct clocksource *cs) +{ + return read_xtal_counter(); +} + +static struct clocksource tango_xtal = { + .name = "tango-xtal", + .rating = 350, + .read = read_clocksource, + .mask = CLOCKSOURCE_MASK(32), + .flags = CLOCK_SOURCE_IS_CONTINUOUS, +}; + +static void __init tango_clocksource_init(struct device_node *np) +{ + struct clk *clk = of_clk_get(np, 0); + unsigned int xtal_freq = clk_get_rate(clk); + xtal_in_cnt = of_iomap(np, 0); + + delay_timer.freq = xtal_freq; + delay_timer.read_current_timer = read_xtal_counter; + register_current_timer_delay(&delay_timer); + sched_clock_register(read_sched_clock, 32, xtal_freq); + clocksource_register_hz(&tango_xtal, xtal_freq); +} + +CLOCKSOURCE_OF_DECLARE(tango, "sigma,tick-counter", tango_clocksource_init); -- 2.4.5