From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-we0-f177.google.com ([74.125.82.177]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1TLLUY-00049D-Vb for barebox@lists.infradead.org; Mon, 08 Oct 2012 22:08:04 +0000 Received: by mail-we0-f177.google.com with SMTP id u50so2970432wey.36 for ; Mon, 08 Oct 2012 15:08:01 -0700 (PDT) From: Carlo Caione Date: Tue, 9 Oct 2012 00:07:40 +0200 Message-Id: <1349734061-32339-5-git-send-email-carlo.caione@gmail.com> In-Reply-To: <1349734061-32339-1-git-send-email-carlo.caione@gmail.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 4/5] Add support for BCM2835 clocksource References: <1349734061-32339-1-git-send-email-carlo.caione@gmail.com> To: barebox@lists.infradead.org Signed-off-by: Carlo Caione --- drivers/clocksource/Kconfig | 4 +++ drivers/clocksource/Makefile | 1 + drivers/clocksource/bcm2835.c | 83 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 88 insertions(+) create mode 100644 drivers/clocksource/bcm2835.c diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 9d6d293..590d06d 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -2,6 +2,10 @@ config ARM_SMP_TWD bool depends on ARM && CPU_V7 +config CLOCKSOURCE_BCM2835 + bool + depends on ARM + config CLOCKSOURCE_NOMADIK bool depends on ARM diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile index bef465c..92d7c13 100644 --- a/drivers/clocksource/Makefile +++ b/drivers/clocksource/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_ARM_SMP_TWD) += arm_smp_twd.o +obj-$(CONFIG_CLOCKSOURCE_BCM2835) += bcm2835.o obj-$(CONFIG_CLOCKSOURCE_NOMADIK) += nomadik.o diff --git a/drivers/clocksource/bcm2835.c b/drivers/clocksource/bcm2835.c new file mode 100644 index 0000000..c1aee62 --- /dev/null +++ b/drivers/clocksource/bcm2835.c @@ -0,0 +1,83 @@ +/* + * Author: Carlo Caione + * + * Based on clocksource for nomadik + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + * + */ + + +#include +#include +#include +#include +#include +#include +#include +#include + +static __iomem void *stc_base; + +static uint64_t stc_read_cycles(void) +{ + return readl(stc_base + 0x04); +} + +static struct clocksource bcm2835_stc = { + .read = stc_read_cycles, + .mask = CLOCKSOURCE_MASK(32), +}; + +static int bcm2835_cs_probe(struct device_d *dev) +{ + static struct clk *stc_clk; + u32 rate; + int ret; + + stc_clk = clk_get(dev, NULL); + if (IS_ERR(stc_clk)) { + ret = PTR_ERR(stc_clk); + dev_err(dev, "clock not found: %d\n", ret); + return ret; + } + + ret = clk_enable(stc_clk); + if (ret < 0) { + dev_err(dev, "clock failed to enable: %d\n", ret); + clk_put(stc_clk); + return ret; + } + + rate = clk_get_rate(stc_clk); + stc_base = dev_request_mem_region(dev, 0); + + clocks_calc_mult_shift(&bcm2835_stc.mult, &bcm2835_stc.shift, rate, NSEC_PER_SEC, 60); + init_clock(&bcm2835_stc); + + return 0; +} + +static struct driver_d bcm2835_cs_driver = { + .name = "bcm2835-cs", + .probe = bcm2835_cs_probe, +}; + +static int bcm2835_cs_init(void) +{ + return platform_driver_register(&bcm2835_cs_driver); +} +coredevice_initcall(bcm2835_cs_init); -- 1.7.12.2 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox