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[209.132.180.67]) by mx.google.com with ESMTP id y62si2885312pff.159.2017.06.06.05.44.39; Tue, 06 Jun 2017 05:44:39 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751492AbdFFMo3 (ORCPT + 25 others); Tue, 6 Jun 2017 08:44:29 -0400 Received: from mail-wm0-f44.google.com ([74.125.82.44]:36085 "EHLO mail-wm0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751305AbdFFMo2 (ORCPT ); Tue, 6 Jun 2017 08:44:28 -0400 Received: by mail-wm0-f44.google.com with SMTP id 7so96705540wmo.1 for ; Tue, 06 Jun 2017 05:44:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id; bh=IFxoaK/Yo+GxT+ttfNK+jYrxqYTC99oaKr52zByheqo=; b=R+Czt7YTyGCufyRvB4FWIBNp8fKBPJihR7hPVRb17eCeiH7tBIJyBWNRteSXxBgNsT /WytyEF1Iw2WYa3W3TmnbmDdrrXGFD2Ifjr67SV69N9VNLsNefh5FdJCz6iK+1OLtYLe k05FOk7DNVrJKHdezcccj174D6Lf6gNtjXniU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=IFxoaK/Yo+GxT+ttfNK+jYrxqYTC99oaKr52zByheqo=; b=XtHL1mUo1PZd43yg6ulz7XbF6Vpc4IuQFzBPjrkGVsXT8LCCfLSCSPmnJ2JBBtuKue aQGzIaDwNckYdpDlVj5U/RZ62s/CMs+rH8wCMiTZy3xPg3KMc2oQ/Kn/TpniNn8VRdzt ouyvfe+UPYjxvaRVXYaaKvrrZ5xUXHT1q23Tb6zuys2URu47miuqP0z4AOSstw5KXirz 6wiT+Q4KFgXnWfx9Ws1EuHaryl3eShacqpXh+9JUMD7GENrFxE3BU6HzQH78F6e1umJX FKLofvTLBifB9Am6bFmpEFZvHMsDpT5m+kqOhpeSAQsten7WyMNWmFI8GReIPMg3iYvZ Zz2w== X-Gm-Message-State: AODbwcBnzVJZuesf0KhnNTA5uVGQPPifCkMsxXzTuD6/4fhHNMlLf7XM a56bD/dRp4fHmlXo X-Received: by 10.28.27.76 with SMTP id b73mr9078183wmb.120.1496753066376; Tue, 06 Jun 2017 05:44:26 -0700 (PDT) Received: from localhost.localdomain ([2001:41d0:fe90:b800:3f16:bcf7:601c:a13b]) by smtp.gmail.com with ESMTPSA id w17sm6277827wra.34.2017.06.06.05.44.24 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 06 Jun 2017 05:44:25 -0700 (PDT) From: Daniel Lezcano To: tglx@linutronix.de Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] clocksource/drivers: Add timer-of common init routine Date: Tue, 6 Jun 2017 14:44:11 +0200 Message-Id: <1496753054-7489-1-git-send-email-daniel.lezcano@linaro.org> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The different drivers are all using the same pattern when initializing. 1. Get the base address 2. Get the irq number 3. Get the clock 4. Prepare and enable the clock 5. Get the rate 6. Request an interrupt Instead of repeating again and again these steps in all the drivers, let's provide a common init routine to give the opportunity to factor all of them out. We can expect a significant kernel size improvement when the common routine will be used in all the drivers. Signed-off-by: Daniel Lezcano --- drivers/clocksource/Makefile | 1 + drivers/clocksource/timer-of.c | 168 +++++++++++++++++++++++++++++++++++++++++ drivers/clocksource/timer-of.h | 67 ++++++++++++++++ 3 files changed, 236 insertions(+) create mode 100644 drivers/clocksource/timer-of.c create mode 100644 drivers/clocksource/timer-of.h -- 2.7.4 diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile index ec55921..72bfd00 100644 --- a/drivers/clocksource/Makefile +++ b/drivers/clocksource/Makefile @@ -1,3 +1,4 @@ +obj-$(CONFIG_TIMER_OF) += timer-of.o obj-$(CONFIG_TIMER_PROBE) += timer-probe.o obj-$(CONFIG_ATMEL_PIT) += timer-atmel-pit.o obj-$(CONFIG_ATMEL_ST) += timer-atmel-st.o diff --git a/drivers/clocksource/timer-of.c b/drivers/clocksource/timer-of.c new file mode 100644 index 0000000..f25dc72 --- /dev/null +++ b/drivers/clocksource/timer-of.c @@ -0,0 +1,168 @@ +/* + * Copyright (c) 2017, Linaro Ltd. All rights reserved. + * + * Author: Daniel Lezcano + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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, see . + */ +#include +#include +#include +#include +#include +#include + +#include "timer-of.h" + +static __init void timer_irq_exit(struct of_timer_irq *of_irq) +{ + struct timer_of *to = container_of(of_irq, struct timer_of, of_irq); + + struct clock_event_device *clkevt = &to->clkevt; + + of_irq->percpu ? free_percpu_irq(of_irq->irq, clkevt) : + free_irq(of_irq->irq, clkevt); +} + +static __init int timer_irq_init(struct device_node *np, + struct of_timer_irq *of_irq) +{ + int ret; + struct timer_of *to = container_of(of_irq, struct timer_of, of_irq); + struct clock_event_device *clkevt = &to->clkevt; + + of_irq->irq = of_irq->name ? of_irq_get_byname(np, of_irq->name): + irq_of_parse_and_map(np, of_irq->index); + if (!of_irq->irq) { + pr_err("Failed to map interrupt for %s\n", np->full_name); + return -EINVAL; + } + + ret = of_irq->percpu ? + request_percpu_irq(of_irq->irq, of_irq->handler, + np->full_name, clkevt) : + request_irq(of_irq->irq, of_irq->handler, IRQF_TIMER, + np->full_name, clkevt); + if (ret) { + pr_err("Failed to request irq %d for %s\n", of_irq->irq, + np->full_name); + return ret; + } + + clkevt->irq = of_irq->irq; + + return 0; +} + +static __init void timer_clk_exit(struct of_timer_clk *of_clk) +{ + of_clk->rate = 0; + clk_disable_unprepare(of_clk->clk); + clk_put(of_clk->clk); +} + +static __init int timer_clk_init(struct device_node *np, + struct of_timer_clk *of_clk) +{ + int ret; + + of_clk->clk = of_clk->name ? of_clk_get_by_name(np, of_clk->name) : + of_clk_get(np, of_clk->index); + if (IS_ERR(of_clk->clk)) { + pr_err("Failed to get clock for %s\n", np->full_name); + return PTR_ERR(of_clk->clk); + } + + ret = clk_prepare_enable(of_clk->clk); + if (ret) { + pr_err("Failed for enable clock for %s\n", np->full_name); + goto out_clk_put; + } + + of_clk->rate = clk_get_rate(of_clk->clk); + if (!of_clk->rate) { + ret = -EINVAL; + pr_err("Failed to get clock rate for %s\n", np->full_name); + goto out_clk_disable; + } + + of_clk->period = DIV_ROUND_UP(of_clk->rate, HZ); +out: + return ret; + +out_clk_disable: + clk_disable_unprepare(of_clk->clk); +out_clk_put: + clk_put(of_clk->clk); + + goto out; +} + +static __init void timer_base_exit(struct of_timer_base *of_base) +{ + iounmap(of_base->base); +} + +static __init int timer_base_init(struct device_node *np, + struct of_timer_base *of_base) +{ + const char *name = of_base->name ? of_base->name : np->full_name; + + of_base->base = of_io_request_and_map(np, of_base->index, name); + if (of_base->base) { + pr_err("Failed to iomap (%s)\n", name); + return -ENXIO; + } + + return 0; +} + +int __init timer_of_init(struct device_node *np, struct timer_of *to) +{ + int ret; + int flags = 0; + + if (to->flags & TIMER_OF_BASE) { + ret = timer_base_init(np, &to->of_base); + if (ret) + goto out_fail; + flags |= TIMER_OF_BASE; + } + + if (to->flags & TIMER_OF_CLOCK) { + ret = timer_clk_init(np, &to->of_clk); + if (ret) + goto out_fail; + flags |= TIMER_OF_CLOCK; + } + + if (to->flags & TIMER_OF_IRQ) { + ret = timer_irq_init(np, &to->of_irq); + if (ret) + goto out_fail; + flags |= TIMER_OF_IRQ; + } +out: + return ret; + +out_fail: + if (flags & TIMER_OF_IRQ) + timer_irq_exit(&to->of_irq); + + if (flags & TIMER_OF_CLOCK) + timer_clk_exit(&to->of_clk); + + if (flags & TIMER_OF_BASE) + timer_base_exit(&to->of_base); + goto out; +} diff --git a/drivers/clocksource/timer-of.h b/drivers/clocksource/timer-of.h new file mode 100644 index 0000000..70b55aee --- /dev/null +++ b/drivers/clocksource/timer-of.h @@ -0,0 +1,67 @@ +#ifndef __TIMER_OF_H__ +#define __TIMER_OF_H__ + +#include + +#define TIMER_OF_BASE 0x1 +#define TIMER_OF_CLOCK 0x2 +#define TIMER_OF_IRQ 0x4 + +struct of_timer_irq { + int irq; + int index; + int percpu; + const char *name; + irq_handler_t handler; +}; + +struct of_timer_base { + void __iomem *base; + const char *name; + int index; +}; + +struct of_timer_clk { + struct clk *clk; + const char *name; + int index; + unsigned long rate; + unsigned long period; +}; + +struct timer_of { + unsigned int flags; + struct clock_event_device clkevt; + struct of_timer_base of_base; + struct of_timer_irq of_irq; + struct of_timer_clk of_clk; +}; + +static inline struct timer_of *to_timer_of(struct clock_event_device *clkevt) +{ + return container_of(clkevt, struct timer_of, clkevt); +} + +static inline void __iomem *timer_of_base(struct timer_of *to) +{ + return to->of_base.base; +} + +static inline int timer_of_irq(struct timer_of *to) +{ + return to->of_irq.irq; +} + +static inline unsigned long timer_of_rate(struct timer_of *to) +{ + return to->of_clk.rate; +} + +static inline unsigned long timer_of_period(struct timer_of *to) +{ + return to->of_clk.period; +} + +extern int __init timer_of_init(struct device_node *np, + struct timer_of *to); +#endif