From patchwork Fri Jul 9 07:37:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 12366887 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B114EC07E9C for ; Fri, 9 Jul 2021 07:37:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 91C0E613C9 for ; Fri, 9 Jul 2021 07:37:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231278AbhGIHki (ORCPT ); Fri, 9 Jul 2021 03:40:38 -0400 Received: from muru.com ([72.249.23.125]:39300 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230121AbhGIHki (ORCPT ); Fri, 9 Jul 2021 03:40:38 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 6C9928050; Fri, 9 Jul 2021 07:38:08 +0000 (UTC) From: Tony Lindgren To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, Daniel Lezcano , Keerthy , Tero Kristo Subject: [Backport for 4.19.y PATCH 2/4] clocksource/drivers/timer-ti-dm: Add clockevent and clocksource support Date: Fri, 9 Jul 2021 10:37:43 +0300 Message-Id: <20210709073745.13916-2-tony@atomide.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210709073745.13916-1-tony@atomide.com> References: <20210709073745.13916-1-tony@atomide.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org commit 52762fbd1c4778ac9b173624ca0faacd22ef4724 upstream. We can move the TI dmtimer clockevent and clocksource to live under drivers/clocksource if we rely only on the clock framework, and handle the module configuration directly in the clocksource driver based on the device tree data. This removes the early dependency with system timers to the interconnect related code, and we can probe pretty much everything else later on at the module_init level. Let's first add a new driver for timer-ti-dm-systimer based on existing arch/arm/mach-omap2/timer.c. Then let's start moving SoCs to probe with device tree data while still keeping the old timer.c. And eventually we can just drop the old timer.c. Let's take the opportunity to switch to use readl/writel as pointed out by Daniel Lezcano . This allows further clean-up of the timer-ti-dm code the a lot of the shared helpers can just become static to the non-syster related code. Note the boards can optionally configure different timer source clocks if needed with assigned-clocks and assigned-clock-parents. Cc: Daniel Lezcano Cc: Keerthy Cc: Tero Kristo [tony@atomide.com: backported to 4.19.y] Signed-off-by: Tony Lindgren --- arch/arm/mach-omap2/timer.c | 105 +++++++++++++++++++++--------------- 1 file changed, 63 insertions(+), 42 deletions(-) diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c --- a/arch/arm/mach-omap2/timer.c +++ b/arch/arm/mach-omap2/timer.c @@ -64,15 +64,28 @@ /* Clockevent code */ -static struct omap_dm_timer clkev; -static struct clock_event_device clockevent_gpt; - /* Clockevent hwmod for am335x and am437x suspend */ static struct omap_hwmod *clockevent_gpt_hwmod; /* Clockesource hwmod for am437x suspend */ static struct omap_hwmod *clocksource_gpt_hwmod; +struct dmtimer_clockevent { + struct clock_event_device dev; + struct omap_dm_timer timer; +}; + +static struct dmtimer_clockevent clockevent; + +static struct omap_dm_timer *to_dmtimer(struct clock_event_device *clockevent) +{ + struct dmtimer_clockevent *clkevt = + container_of(clockevent, struct dmtimer_clockevent, dev); + struct omap_dm_timer *timer = &clkevt->timer; + + return timer; +} + #ifdef CONFIG_SOC_HAS_REALTIME_COUNTER static unsigned long arch_timer_freq; @@ -84,10 +97,11 @@ void set_cntfreq(void) static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id) { - struct clock_event_device *evt = &clockevent_gpt; - - __omap_dm_timer_write_status(&clkev, OMAP_TIMER_INT_OVERFLOW); + struct dmtimer_clockevent *clkevt = dev_id; + struct clock_event_device *evt = &clkevt->dev; + struct omap_dm_timer *timer = &clkevt->timer; + __omap_dm_timer_write_status(timer, OMAP_TIMER_INT_OVERFLOW); evt->event_handler(evt); return IRQ_HANDLED; } @@ -95,7 +109,9 @@ static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id) static int omap2_gp_timer_set_next_event(unsigned long cycles, struct clock_event_device *evt) { - __omap_dm_timer_load_start(&clkev, OMAP_TIMER_CTRL_ST, + struct omap_dm_timer *timer = to_dmtimer(evt); + + __omap_dm_timer_load_start(timer, OMAP_TIMER_CTRL_ST, 0xffffffff - cycles, OMAP_TIMER_POSTED); return 0; @@ -103,22 +119,26 @@ static int omap2_gp_timer_set_next_event(unsigned long cycles, static int omap2_gp_timer_shutdown(struct clock_event_device *evt) { - __omap_dm_timer_stop(&clkev, OMAP_TIMER_POSTED, clkev.rate); + struct omap_dm_timer *timer = to_dmtimer(evt); + + __omap_dm_timer_stop(timer, OMAP_TIMER_POSTED, timer->rate); + return 0; } static int omap2_gp_timer_set_periodic(struct clock_event_device *evt) { + struct omap_dm_timer *timer = to_dmtimer(evt); u32 period; - __omap_dm_timer_stop(&clkev, OMAP_TIMER_POSTED, clkev.rate); + __omap_dm_timer_stop(timer, OMAP_TIMER_POSTED, timer->rate); - period = clkev.rate / HZ; + period = timer->rate / HZ; period -= 1; /* Looks like we need to first set the load value separately */ - __omap_dm_timer_write(&clkev, OMAP_TIMER_LOAD_REG, 0xffffffff - period, + __omap_dm_timer_write(timer, OMAP_TIMER_LOAD_REG, 0xffffffff - period, OMAP_TIMER_POSTED); - __omap_dm_timer_load_start(&clkev, + __omap_dm_timer_load_start(timer, OMAP_TIMER_CTRL_AR | OMAP_TIMER_CTRL_ST, 0xffffffff - period, OMAP_TIMER_POSTED); return 0; @@ -132,26 +152,17 @@ static void omap_clkevt_idle(struct clock_event_device *unused) omap_hwmod_idle(clockevent_gpt_hwmod); } -static void omap_clkevt_unidle(struct clock_event_device *unused) +static void omap_clkevt_unidle(struct clock_event_device *evt) { + struct omap_dm_timer *timer = to_dmtimer(evt); + if (!clockevent_gpt_hwmod) return; omap_hwmod_enable(clockevent_gpt_hwmod); - __omap_dm_timer_int_enable(&clkev, OMAP_TIMER_INT_OVERFLOW); + __omap_dm_timer_int_enable(timer, OMAP_TIMER_INT_OVERFLOW); } -static struct clock_event_device clockevent_gpt = { - .features = CLOCK_EVT_FEAT_PERIODIC | - CLOCK_EVT_FEAT_ONESHOT, - .rating = 300, - .set_next_event = omap2_gp_timer_set_next_event, - .set_state_shutdown = omap2_gp_timer_shutdown, - .set_state_periodic = omap2_gp_timer_set_periodic, - .set_state_oneshot = omap2_gp_timer_shutdown, - .tick_resume = omap2_gp_timer_shutdown, -}; - static const struct of_device_id omap_timer_match[] __initconst = { { .compatible = "ti,omap2420-timer", }, { .compatible = "ti,omap3430-timer", }, @@ -361,44 +372,54 @@ static void __init omap2_gp_clockevent_init(int gptimer_id, const char *fck_source, const char *property) { + struct dmtimer_clockevent *clkevt = &clockevent; + struct omap_dm_timer *timer = &clkevt->timer; int res; - clkev.id = gptimer_id; - clkev.errata = omap_dm_timer_get_errata(); + timer->id = gptimer_id; + timer->errata = omap_dm_timer_get_errata(); + clkevt->dev.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; + clkevt->dev.rating = 300; + clkevt->dev.set_next_event = omap2_gp_timer_set_next_event; + clkevt->dev.set_state_shutdown = omap2_gp_timer_shutdown; + clkevt->dev.set_state_periodic = omap2_gp_timer_set_periodic; + clkevt->dev.set_state_oneshot = omap2_gp_timer_shutdown; + clkevt->dev.tick_resume = omap2_gp_timer_shutdown; /* * For clock-event timers we never read the timer counter and * so we are not impacted by errata i103 and i767. Therefore, * we can safely ignore this errata for clock-event timers. */ - __omap_dm_timer_override_errata(&clkev, OMAP_TIMER_ERRATA_I103_I767); + __omap_dm_timer_override_errata(timer, OMAP_TIMER_ERRATA_I103_I767); - res = omap_dm_timer_init_one(&clkev, fck_source, property, - &clockevent_gpt.name, OMAP_TIMER_POSTED); + res = omap_dm_timer_init_one(timer, fck_source, property, + &clkevt->dev.name, OMAP_TIMER_POSTED); BUG_ON(res); - if (request_irq(clkev.irq, omap2_gp_timer_interrupt, - IRQF_TIMER | IRQF_IRQPOLL, "gp_timer", &clkev)) - pr_err("Failed to request irq %d (gp_timer)\n", clkev.irq); + clkevt->dev.cpumask = cpu_possible_mask; + clkevt->dev.irq = omap_dm_timer_get_irq(timer); + + if (request_irq(timer->irq, omap2_gp_timer_interrupt, + IRQF_TIMER | IRQF_IRQPOLL, "gp_timer", clkevt)) + pr_err("Failed to request irq %d (gp_timer)\n", timer->irq); - __omap_dm_timer_int_enable(&clkev, OMAP_TIMER_INT_OVERFLOW); + __omap_dm_timer_int_enable(timer, OMAP_TIMER_INT_OVERFLOW); - clockevent_gpt.cpumask = cpu_possible_mask; - clockevent_gpt.irq = omap_dm_timer_get_irq(&clkev); - clockevents_config_and_register(&clockevent_gpt, clkev.rate, + clockevents_config_and_register(&clkevt->dev, timer->rate, 3, /* Timer internal resynch latency */ 0xffffffff); if (soc_is_am33xx() || soc_is_am43xx()) { - clockevent_gpt.suspend = omap_clkevt_idle; - clockevent_gpt.resume = omap_clkevt_unidle; + clkevt->dev.suspend = omap_clkevt_idle; + clkevt->dev.resume = omap_clkevt_unidle; clockevent_gpt_hwmod = - omap_hwmod_lookup(clockevent_gpt.name); + omap_hwmod_lookup(clkevt->dev.name); } - pr_info("OMAP clockevent source: %s at %lu Hz\n", clockevent_gpt.name, - clkev.rate); + pr_info("OMAP clockevent source: %s at %lu Hz\n", clkevt->dev.name, + timer->rate); } /* Clocksource code */