From patchwork Mon Jun 9 17:03:36 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Shiyan X-Patchwork-Id: 4322961 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 6899FBEECB for ; Mon, 9 Jun 2014 17:06:01 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 78D0320279 for ; Mon, 9 Jun 2014 17:06:00 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F3F5920272 for ; Mon, 9 Jun 2014 17:05:58 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Wu2zW-0002pd-C4; Mon, 09 Jun 2014 17:04:14 +0000 Received: from smtp38.i.mail.ru ([94.100.177.98]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Wu2zR-0002i2-A9 for linux-arm-kernel@lists.infradead.org; Mon, 09 Jun 2014 17:04:10 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mail.ru; s=mail2; h=Message-Id:Date:Subject:Cc:To:From; bh=eS/IIZYSmESixc+Fqol1W+eprNXweAWOdbeMDrODDjg=; b=fSqbEOqr0x/RfHRPP1OlozkVNVcZ6HAAXHGK/sJtt3LvE9diAIFtDXuo3LCLlTeh7+ElXQPn8ZJRGW+cGntcGPVH56WFVl8NpXvnsWv8db/dOgnejOlsxuKOGoQM8TY0vCih1s7kc+Fx/3Wuab5EkboE37fk+jPhuTO56qT7nEE=; Received: from [5.18.98.7] (port=52790 helo=shc.zet) by smtp38.i.mail.ru with esmtpa (envelope-from ) id 1Wu2z3-00060E-Ev; Mon, 09 Jun 2014 21:03:45 +0400 From: Alexander Shiyan To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 1/2] clocksource: Add CLPS711X clocksource driver Date: Mon, 9 Jun 2014 21:03:36 +0400 Message-Id: <1402333416-13690-1-git-send-email-shc_work@mail.ru> X-Mailer: git-send-email 1.8.5.5 X-Mras: Ok X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140609_100409_964105_7010C913 X-CRM114-Status: GOOD ( 15.63 ) X-Spam-Score: -0.1 (/) Cc: Olof Johansson , Thomas Gleixner , Daniel Lezcano , Alexander Shiyan , Arnd Bergmann X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, FREEMAIL_FROM, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This adds the clocksource driver for Cirrus Logic CLPS711X series SoCs. Designed primarily for migration CLPS711X subarch for multiplatform & DT, for this as the "OF" and "non-OF" calls implemented. Signed-off-by: Alexander Shiyan --- Actual calls for driver initialization of the boards will be added later in a separate patch for the arm-soc tree to avoid possible conflicts between clk, clocksource and arm-soc trees. --- drivers/clocksource/Makefile | 1 + drivers/clocksource/clps711x-timer.c | 131 +++++++++++++++++++++++++++++++++++ 2 files changed, 132 insertions(+) create mode 100644 drivers/clocksource/clps711x-timer.c diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile index 800b130..eae4837 100644 --- a/drivers/clocksource/Makefile +++ b/drivers/clocksource/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_CLKSRC_DBX500_PRCMU) += clksrc-dbx500-prcmu.o obj-$(CONFIG_ARMADA_370_XP_TIMER) += time-armada-370-xp.o obj-$(CONFIG_ORION_TIMER) += time-orion.o obj-$(CONFIG_ARCH_BCM2835) += bcm2835_timer.o +obj-$(CONFIG_ARCH_CLPS711X) += clps711x-timer.o obj-$(CONFIG_ARCH_MARCO) += timer-marco.o obj-$(CONFIG_ARCH_MOXART) += moxart_timer.o obj-$(CONFIG_ARCH_MXS) += mxs_timer.o diff --git a/drivers/clocksource/clps711x-timer.c b/drivers/clocksource/clps711x-timer.c new file mode 100644 index 0000000..d83ec1f --- /dev/null +++ b/drivers/clocksource/clps711x-timer.c @@ -0,0 +1,131 @@ +/* + * Cirrus Logic CLPS711X clocksource driver + * + * Copyright (C) 2014 Alexander Shiyan + * + * 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +enum { + CLPS711X_CLKSRC_CLOCKSOURCE, + CLPS711X_CLKSRC_CLOCKEVENT, +}; + +static void __iomem *tcd; + +static u64 notrace clps711x_sched_clock_read(void) +{ + return ~readw(tcd); +} + +static int __init _clps711x_clksrc_init(struct clk *clock, void __iomem *base) +{ + unsigned long rate; + + if (!base) + return -ENOMEM; + if (IS_ERR(clock)) + return PTR_ERR(clock); + + rate = clk_get_rate(clock); + + tcd = base; + + clocksource_mmio_init(tcd, "clps711x-clocksource", rate, 300, 16, + clocksource_mmio_readw_down); + + sched_clock_register(clps711x_sched_clock_read, 16, rate); + + return 0; +} + +static irqreturn_t clps711x_timer_interrupt(int irq, void *dev_id) +{ + struct clock_event_device *evt = dev_id; + + evt->event_handler(evt); + + return IRQ_HANDLED; +} + +static void clps711x_clockevent_set_mode(enum clock_event_mode mode, + struct clock_event_device *evt) +{ +} + +static int __init _clps711x_clkevt_init(struct clk *clock, void __iomem *base, + unsigned int irq) +{ + struct clock_event_device *clkevt; + unsigned long rate; + + if (!irq) + return -EINVAL; + if (!base) + return -ENOMEM; + if (IS_ERR(clock)) + return PTR_ERR(clock); + + clkevt = kzalloc(sizeof(*clkevt), GFP_KERNEL); + if (!clkevt) + return -ENOMEM; + + rate = clk_get_rate(clock); + + /* Set Timer prescaler */ + writew(DIV_ROUND_CLOSEST(rate, HZ), base); + + clkevt->name = "clps711x-clockevent"; + clkevt->rating = 300; + clkevt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_C3STOP; + clkevt->set_mode = clps711x_clockevent_set_mode; + clkevt->cpumask = cpumask_of(0); + clockevents_config_and_register(clkevt, HZ, 0, 0); + + return request_irq(irq, clps711x_timer_interrupt, IRQF_TIMER, + "clps711x-timer", clkevt); +} + +void __init clps711x_clksrc_init(void __iomem *tc1_base, void __iomem *tc2_base, + unsigned int irq) +{ + struct clk *tc1 = clk_get_sys("clps711x-timer.0", NULL); + struct clk *tc2 = clk_get_sys("clps711x-timer.1", NULL); + + BUG_ON(_clps711x_clksrc_init(tc1, tc1_base)); + BUG_ON(_clps711x_clkevt_init(tc2, tc2_base, irq)); +} + +#ifdef CONFIG_CLKSRC_OF +static void __init clps711x_timer_init(struct device_node *np) +{ + unsigned int irq = irq_of_parse_and_map(np, 0); + struct clk *clock = of_clk_get(np, 0); + void __iomem *base = of_iomap(np, 0); + + switch (of_alias_get_id(np, "timer")) { + case CLPS711X_CLKSRC_CLOCKSOURCE: + BUG_ON(_clps711x_clksrc_init(clock, base)); + break; + case CLPS711X_CLKSRC_CLOCKEVENT: + BUG_ON(_clps711x_clkevt_init(clock, base, irq)); + break; + default: + break; + } +} +CLOCKSOURCE_OF_DECLARE(clps711x, "cirrus,clps711x-timer", clps711x_timer_init); +#endif