From: Baolin Wang <baolin.wang@linaro.org> To: tglx@linutronix.de, john.stultz@linaro.org, daniel.lezcano@linaro.org, arnd@arndb.de, tony@atomide.com, aaro.koskinen@iki.fi, linux@armlinux.org.uk, mark.rutland@arm.com, marc.zyngier@arm.com Cc: baolin.wang@linaro.org, broonie@kernel.org, paulmck@linux.vnet.ibm.com, mlichvar@redhat.com, rdunlap@infradead.org, kstewart@linuxfoundation.org, gregkh@linuxfoundation.org, pombredanne@nexb.com, thierry.reding@gmail.com, jonathanh@nvidia.com, heiko@sntech.de, linus.walleij@linaro.org, viresh.kumar@linaro.org, mingo@kernel.org, hpa@zytor.com, peterz@infradead.org, douly.fnst@cn.fujitsu.com, len.brown@intel.com, rajvi.jingar@intel.com, alexandre.belloni@bootlin.com, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org Subject: [PATCH 2/8] clocksource: sprd: Add one persistent timer for Spreadtrum platform Date: Wed, 13 Jun 2018 19:32:29 +0800 [thread overview] Message-ID: <95ec43d6f335e31d6e1da4eb0db522008728363b.1528878545.git.baolin.wang@linaro.org> (raw) In-Reply-To: <cover.1528878545.git.baolin.wang@linaro.org> In-Reply-To: <cover.1528878545.git.baolin.wang@linaro.org> On Spreadtrum SC9860 platform, we need one persistent timer to calculate the suspend time to compensate the OS time. This patch registers one Spreadtrum AON timer as persistent timer, which runs at 32bit and periodic mode. Signed-off-by: Baolin Wang <baolin.wang@linaro.org> --- drivers/clocksource/Kconfig | 1 + drivers/clocksource/timer-sprd.c | 80 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 81 insertions(+) diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index dec0dd8..7f11c6c 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -455,6 +455,7 @@ config SPRD_TIMER depends on (ARCH_SPRD || COMPILE_TEST) default ARCH_SPRD select TIMER_OF + select PERSISTENT_CLOCK help Enables support for the Spreadtrum timer driver. diff --git a/drivers/clocksource/timer-sprd.c b/drivers/clocksource/timer-sprd.c index ef9ebea..c6f657a 100644 --- a/drivers/clocksource/timer-sprd.c +++ b/drivers/clocksource/timer-sprd.c @@ -3,8 +3,11 @@ * Copyright (C) 2017 Spreadtrum Communications Inc. */ +#include <linux/clk.h> #include <linux/init.h> #include <linux/interrupt.h> +#include <linux/of_address.h> +#include <linux/persistent_clock.h> #include "timer-of.h" @@ -157,3 +160,80 @@ static int __init sprd_timer_init(struct device_node *np) } TIMER_OF_DECLARE(sc9860_timer, "sprd,sc9860-timer", sprd_timer_init); + +void __iomem *pbase; + +static u64 sprd_persistent_timer_read(void) +{ + return ~(u64)readl_relaxed(pbase + TIMER_VALUE_SHDW_LO) & + CLOCKSOURCE_MASK(32); +} + +static void sprd_persistent_timer_disable(void) +{ + sprd_timer_disable(pbase); +} + +static void sprd_persistent_timer_enable(void) +{ + sprd_timer_disable(pbase); + sprd_timer_update_counter(pbase, TIMER_VALUE_LO_MASK); + sprd_timer_enable(pbase, TIMER_CTL_PERIOD_MODE); +} + +static int __init sprd_persistent_timer_init(struct device_node *np) +{ + struct clk *clk; + u32 freq; + int ret; + + clk = of_clk_get(np, 0); + if (IS_ERR(clk)) { + pr_err("Can't get timer clock for %pOF\n", np); + return PTR_ERR(clk); + } + + ret = clk_prepare_enable(clk); + if (ret) { + pr_err("Failed to enable clock for %pOF\n", np); + clk_put(clk); + return ret; + } + + freq = clk_get_rate(clk); + if (!freq) { + pr_err("Failed to get clock rate for %pOF\n", np); + ret = -EINVAL; + goto clk_rate_err; + } + + pbase = of_io_request_and_map(np, 0, of_node_full_name(np)); + if (IS_ERR(pbase)) { + pr_err("Can't map timer registers for %pOF\n", np); + ret = PTR_ERR(pbase); + goto clk_rate_err; + } + + sprd_persistent_timer_enable(); + + ret = persistent_clock_init_and_register(sprd_persistent_timer_read, + CLOCKSOURCE_MASK(32), freq, 0); + if (ret) { + pr_err("Failed to register persistent clock for %pOF\n", np); + goto persist_err; + } + + return 0; + +persist_err: + sprd_persistent_timer_disable(); + iounmap(pbase); +clk_rate_err: + clk_disable_unprepare(clk); + clk_put(clk); + + return ret; +} + +TIMER_OF_DECLARE(sc9860_persistent_timer, "sprd,sc9860-persistent-timer", + sprd_persistent_timer_init); -- 1.7.9.5
WARNING: multiple messages have this Message-ID (diff)
From: baolin.wang@linaro.org (Baolin Wang) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 2/8] clocksource: sprd: Add one persistent timer for Spreadtrum platform Date: Wed, 13 Jun 2018 19:32:29 +0800 [thread overview] Message-ID: <95ec43d6f335e31d6e1da4eb0db522008728363b.1528878545.git.baolin.wang@linaro.org> (raw) In-Reply-To: <cover.1528878545.git.baolin.wang@linaro.org> On Spreadtrum SC9860 platform, we need one persistent timer to calculate the suspend time to compensate the OS time. This patch registers one Spreadtrum AON timer as persistent timer, which runs at 32bit and periodic mode. Signed-off-by: Baolin Wang <baolin.wang@linaro.org> --- drivers/clocksource/Kconfig | 1 + drivers/clocksource/timer-sprd.c | 80 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 81 insertions(+) diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index dec0dd8..7f11c6c 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -455,6 +455,7 @@ config SPRD_TIMER depends on (ARCH_SPRD || COMPILE_TEST) default ARCH_SPRD select TIMER_OF + select PERSISTENT_CLOCK help Enables support for the Spreadtrum timer driver. diff --git a/drivers/clocksource/timer-sprd.c b/drivers/clocksource/timer-sprd.c index ef9ebea..c6f657a 100644 --- a/drivers/clocksource/timer-sprd.c +++ b/drivers/clocksource/timer-sprd.c @@ -3,8 +3,11 @@ * Copyright (C) 2017 Spreadtrum Communications Inc. */ +#include <linux/clk.h> #include <linux/init.h> #include <linux/interrupt.h> +#include <linux/of_address.h> +#include <linux/persistent_clock.h> #include "timer-of.h" @@ -157,3 +160,80 @@ static int __init sprd_timer_init(struct device_node *np) } TIMER_OF_DECLARE(sc9860_timer, "sprd,sc9860-timer", sprd_timer_init); + +void __iomem *pbase; + +static u64 sprd_persistent_timer_read(void) +{ + return ~(u64)readl_relaxed(pbase + TIMER_VALUE_SHDW_LO) & + CLOCKSOURCE_MASK(32); +} + +static void sprd_persistent_timer_disable(void) +{ + sprd_timer_disable(pbase); +} + +static void sprd_persistent_timer_enable(void) +{ + sprd_timer_disable(pbase); + sprd_timer_update_counter(pbase, TIMER_VALUE_LO_MASK); + sprd_timer_enable(pbase, TIMER_CTL_PERIOD_MODE); +} + +static int __init sprd_persistent_timer_init(struct device_node *np) +{ + struct clk *clk; + u32 freq; + int ret; + + clk = of_clk_get(np, 0); + if (IS_ERR(clk)) { + pr_err("Can't get timer clock for %pOF\n", np); + return PTR_ERR(clk); + } + + ret = clk_prepare_enable(clk); + if (ret) { + pr_err("Failed to enable clock for %pOF\n", np); + clk_put(clk); + return ret; + } + + freq = clk_get_rate(clk); + if (!freq) { + pr_err("Failed to get clock rate for %pOF\n", np); + ret = -EINVAL; + goto clk_rate_err; + } + + pbase = of_io_request_and_map(np, 0, of_node_full_name(np)); + if (IS_ERR(pbase)) { + pr_err("Can't map timer registers for %pOF\n", np); + ret = PTR_ERR(pbase); + goto clk_rate_err; + } + + sprd_persistent_timer_enable(); + + ret = persistent_clock_init_and_register(sprd_persistent_timer_read, + CLOCKSOURCE_MASK(32), freq, 0); + if (ret) { + pr_err("Failed to register persistent clock for %pOF\n", np); + goto persist_err; + } + + return 0; + +persist_err: + sprd_persistent_timer_disable(); + iounmap(pbase); +clk_rate_err: + clk_disable_unprepare(clk); + clk_put(clk); + + return ret; +} + +TIMER_OF_DECLARE(sc9860_persistent_timer, "sprd,sc9860-persistent-timer", + sprd_persistent_timer_init); -- 1.7.9.5
next prev parent reply other threads:[~2018-06-13 11:32 UTC|newest] Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-06-13 11:32 [PATCH 0/8] Add persistent clock support Baolin Wang 2018-06-13 11:32 ` Baolin Wang 2018-06-13 11:32 ` [PATCH 1/8] time: " Baolin Wang 2018-06-13 11:32 ` Baolin Wang 2018-06-24 0:14 ` Thomas Gleixner 2018-06-24 0:14 ` Thomas Gleixner 2018-06-24 0:14 ` Thomas Gleixner 2018-06-25 16:18 ` Thomas Gleixner 2018-06-25 16:18 ` Thomas Gleixner 2018-06-25 17:23 ` John Stultz 2018-06-25 17:23 ` John Stultz 2018-06-25 17:23 ` John Stultz 2018-06-25 20:06 ` Thomas Gleixner 2018-06-25 20:06 ` Thomas Gleixner 2018-06-25 20:06 ` Thomas Gleixner 2018-06-26 2:12 ` Baolin Wang 2018-06-26 2:12 ` Baolin Wang 2018-06-26 2:12 ` Baolin Wang 2018-06-26 2:08 ` Baolin Wang 2018-06-26 2:08 ` Baolin Wang 2018-06-26 2:08 ` Baolin Wang 2018-06-13 11:32 ` Baolin Wang [this message] 2018-06-13 11:32 ` [PATCH 2/8] clocksource: sprd: Add one persistent timer for Spreadtrum platform Baolin Wang 2018-06-13 11:32 ` [PATCH 3/8] arm: time: Remove the persistent clock support for ARM architecture Baolin Wang 2018-06-13 11:32 ` Baolin Wang 2018-06-24 0:21 ` Thomas Gleixner 2018-06-24 0:21 ` Thomas Gleixner 2018-06-24 0:21 ` Thomas Gleixner 2018-06-13 11:32 ` [PATCH 4/8] clocksource: arm_arch_timer: Register the persistent clock Baolin Wang 2018-06-13 11:32 ` Baolin Wang 2018-06-13 11:32 ` [PATCH 5/8] clocksource: timer-ti-32k: " Baolin Wang 2018-06-13 11:32 ` Baolin Wang 2018-06-13 11:32 ` [PATCH 6/8] clocksource: time-pistachio: " Baolin Wang 2018-06-13 11:32 ` Baolin Wang 2018-06-13 11:32 ` [PATCH 7/8] x86: tsc: " Baolin Wang 2018-06-13 11:32 ` Baolin Wang 2018-06-13 11:32 ` [PATCH 8/8] time: timekeeping: Remove time compensating from nonstop clocksources Baolin Wang 2018-06-13 11:32 ` Baolin Wang
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