From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752442Ab3GEWyT (ORCPT ); Fri, 5 Jul 2013 18:54:19 -0400 Received: from gloria.sntech.de ([95.129.55.99]:38022 "EHLO gloria.sntech.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751935Ab3GEWyS (ORCPT ); Fri, 5 Jul 2013 18:54:18 -0400 From: Heiko =?utf-8?q?St=C3=BCbner?= To: John Stultz Subject: [PATCH 5/9] clocksource: dw_apb_timer: quirk for variants without EOI register Date: Sat, 6 Jul 2013 00:54:07 +0200 User-Agent: KMail/1.13.7 (Linux/3.2.0-3-686-pae; KDE/4.8.4; i686; ; ) Cc: Thomas Gleixner , Jamie Iles , Dinh Nguyen , Grant Likely , linux-arm-kernel@lists.infradead.org, Rob Herring , devicetree-discuss@lists.ozlabs.org, linux-kernel@vger.kernel.org, Arnd Bergmann , Olof Johansson , Ulrich Prinz References: <201307060051.09716.heiko@sntech.de> In-Reply-To: <201307060051.09716.heiko@sntech.de> MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <201307060054.07784.heiko@sntech.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some variants of the dw_apb_timer don't have an eoi register but instead expect a one to be written to the int_status register at eoi time. Signed-off-by: Ulrich Prinz --- drivers/clocksource/dw_apb_timer.c | 10 +++++++++- include/linux/dw_apb_timer.h | 5 +++++ 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/clocksource/dw_apb_timer.c b/drivers/clocksource/dw_apb_timer.c index 5f80a30..23cd7c6 100644 --- a/drivers/clocksource/dw_apb_timer.c +++ b/drivers/clocksource/dw_apb_timer.c @@ -104,6 +104,11 @@ static void apbt_eoi(struct dw_apb_timer *timer) apbt_readl(timer, timer->reg_eoi); } +static void apbt_eoi_int_status(struct dw_apb_timer *timer) +{ + apbt_writel(timer, 1, timer->reg_int_status); +} + static irqreturn_t dw_apb_clockevent_irq(int irq, void *data) { struct clock_event_device *evt = data; @@ -286,7 +291,10 @@ dw_apb_clockevent_init(int cpu, const char *name, unsigned rating, IRQF_NOBALANCING | IRQF_DISABLED; - dw_ced->eoi = apbt_eoi; + if (quirks & APBTMR_QUIRK_NO_EOI) + dw_ced->eoi = apbt_eoi_int_status; + else + dw_ced->eoi = apbt_eoi; err = setup_irq(irq, &dw_ced->irqaction); if (err) { pr_err("failed to request timer irq\n"); diff --git a/include/linux/dw_apb_timer.h b/include/linux/dw_apb_timer.h index 80f6686..fbe4c6b 100644 --- a/include/linux/dw_apb_timer.h +++ b/include/linux/dw_apb_timer.h @@ -25,6 +25,11 @@ */ #define APBTMR_QUIRK_64BIT_COUNTER BIT(0) +/* The IP does not provide a end-of-interrupt register to clear pending + * interrupts, but requires to write a 1 to the interrupt-status register. + */ +#define APBTMR_QUIRK_NO_EOI BIT(1) + struct dw_apb_timer { void __iomem *base; unsigned long freq; -- 1.7.10.4