From: fu.wei@linaro.org
To: rjw@rjwysocki.net, lenb@kernel.org, daniel.lezcano@linaro.org,
tglx@linutronix.de, marc.zyngier@arm.com, mark.rutland@arm.com,
lorenzo.pieralisi@arm.com, sudeep.holla@arm.com,
hanjun.guo@linaro.org
Cc: linux-arm-kernel@lists.infradead.org,
linaro-acpi@lists.linaro.org, linux-kernel@vger.kernel.org,
linux-acpi@vger.kernel.org, rruigrok@codeaurora.org,
harba@codeaurora.org, cov@codeaurora.org, timur@codeaurora.org,
graeme.gregory@linaro.org, al.stone@linaro.org, jcm@redhat.com,
wei@redhat.com, arnd@arndb.de, catalin.marinas@arm.com,
will.deacon@arm.com, Suravee.Suthikulpanit@amd.com,
leo.duran@amd.com, wim@iguana.be, linux@roeck-us.net,
linux-watchdog@vger.kernel.org, tn@semihalf.com,
christoffer.dall@linaro.org, julien.grall@arm.com,
Fu Wei <fu.wei@linaro.org>
Subject: [PATCH v19 06/15] clocksource/drivers/arm_arch_timer: Rework counter frequency detection.
Date: Wed, 21 Dec 2016 14:45:54 +0800 [thread overview]
Message-ID: <20161221064603.11830-7-fu.wei@linaro.org> (raw)
In-Reply-To: <20161221064603.11830-1-fu.wei@linaro.org>
From: Fu Wei <fu.wei@linaro.org>
Currently, the counter frequency detection call(arch_timer_detect_rate)
combines all the ways to get counter frequency: device-tree property,
system coprocessor register, MMIO timer. But in the most of use cases,
we don't need all the ways to try:
For example, reading device-tree property will be needed only when
system boot with device-tree, getting frequency from MMIO timer register
will beneeded only when we init MMIO timer.
This patch separates paths to determine frequency:
Separate out device-tree code, keep them in device-tree init function.
Separate out the MMIO frequency and the sysreg frequency detection call,
and use the appropriate one for the counter.
Signed-off-by: Fu Wei <fu.wei@linaro.org>
Tested-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
---
drivers/clocksource/arm_arch_timer.c | 49 +++++++++++++++++++++++-------------
1 file changed, 31 insertions(+), 18 deletions(-)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index c7b4482..9a1f138 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -488,27 +488,31 @@ static int arch_timer_starting_cpu(unsigned int cpu)
return 0;
}
-static void
-arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np)
+static void arch_timer_detect_rate(void)
{
- /* Who has more than one independent system counter? */
- if (arch_timer_rate)
- return;
+ /*
+ * Try to get the timer frequency from
+ * cntfrq_el0(system coprocessor register).
+ */
+ if (!arch_timer_rate)
+ arch_timer_rate = arch_timer_get_cntfrq();
+
+ /* Check the timer frequency. */
+ if (!arch_timer_rate)
+ pr_warn("frequency not available\n");
+}
+static void arch_timer_mem_detect_rate(void __iomem *cntbase)
+{
/*
- * Try to determine the frequency from the device tree or CNTFRQ,
- * if ACPI is enabled, get the frequency from CNTFRQ ONLY.
+ * Try to determine the frequency from
+ * CNTFRQ in memory-mapped timer.
*/
- if (!acpi_disabled ||
- of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) {
- if (cntbase)
- arch_timer_rate = readl_relaxed(cntbase + CNTFRQ);
- else
- arch_timer_rate = arch_timer_get_cntfrq();
- }
+ if (!arch_timer_rate)
+ arch_timer_rate = readl_relaxed(cntbase + CNTFRQ);
/* Check the timer frequency. */
- if (arch_timer_rate == 0)
+ if (!arch_timer_rate)
pr_warn("frequency not available\n");
}
@@ -886,7 +890,9 @@ static int __init arch_timer_of_init(struct device_node *np)
for (i = ARCH_TIMER_PHYS_SECURE_PPI; i < ARCH_TIMER_MAX_TIMER_PPI; i++)
arch_timer_ppi[i] = irq_of_parse_and_map(np, i);
- arch_timer_detect_rate(NULL, np);
+ if (!arch_timer_rate &&
+ of_property_read_u32(np, "clock-frequency", &arch_timer_rate))
+ arch_timer_detect_rate();
arch_timer_c3stop = !of_property_read_bool(np, "always-on");
@@ -994,7 +1000,14 @@ static int __init arch_timer_mem_init(struct device_node *np)
goto out;
}
- arch_timer_detect_rate(base, np);
+ /*
+ * Try to determine the frequency from the device tree,
+ * if fail, get the frequency from CNTFRQ.
+ */
+ if (!arch_timer_rate &&
+ of_property_read_u32(np, "clock-frequency", &arch_timer_rate))
+ arch_timer_mem_detect_rate(base);
+
ret = arch_timer_mem_register(base, irq);
if (ret)
goto out;
@@ -1056,7 +1069,7 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table)
gtdt->non_secure_el2_flags);
/* Get the frequency from CNTFRQ */
- arch_timer_detect_rate(NULL, NULL);
+ arch_timer_detect_rate();
arch_timer_uses_ppi = arch_timer_select_ppi();
if (!arch_timer_ppi[arch_timer_uses_ppi]) {
--
2.9.3
next prev parent reply other threads:[~2016-12-21 6:47 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-21 6:45 [PATCH v19 00/15] acpi, clocksource: add GTDT driver and GTDT support in arm_arch_timer fu.wei
2016-12-21 6:45 ` [PATCH v19 01/15] clocksource/drivers/arm_arch_timer: Move enums and defines to header file fu.wei
2016-12-21 6:45 ` [PATCH v19 02/15] clocksource/drivers/arm_arch_timer: Add a new enum for spi type fu.wei
2016-12-21 6:45 ` [PATCH v19 03/15] clocksource/drivers/arm_arch_timer: Improve printk relevant code fu.wei
2016-12-21 6:45 ` [PATCH v19 04/15] clocksource/drivers/arm_arch_timer: rename some enums and defines fu.wei
2016-12-21 6:45 ` [PATCH v19 05/15] clocksource/drivers/arm_arch_timer: rework PPI determination fu.wei
2017-01-16 17:29 ` Mark Rutland
2017-01-17 23:49 ` Fu Wei
2016-12-21 6:45 ` fu.wei [this message]
2017-01-16 17:50 ` [PATCH v19 06/15] clocksource/drivers/arm_arch_timer: Rework counter frequency detection Mark Rutland
2017-01-18 4:27 ` Fu Wei
2016-12-21 6:45 ` [PATCH v19 07/15] clocksource/drivers/arm_arch_timer: Refactor arch_timer_needs_probing fu.wei
2016-12-21 6:45 ` [PATCH v19 08/15] clocksource/drivers/arm_arch_timer: move arch_timer_needs_of_probing into DT init call fu.wei
2016-12-21 6:45 ` [PATCH v19 09/15] clocksource/drivers/arm_arch_timer: Introduce some new structs to prepare for GTDT fu.wei
2016-12-21 6:45 ` [PATCH v19 10/15] clocksource/drivers/arm_arch_timer: Refactor the timer init code " fu.wei
2017-01-16 18:30 ` Mark Rutland
2017-01-17 10:30 ` Fu Wei
2017-01-17 10:39 ` Fu Wei
2017-01-17 12:18 ` Timur Tabi
2017-01-17 12:29 ` Mark Rutland
2017-01-17 13:22 ` Fu Wei
2016-12-21 6:45 ` [PATCH v19 11/15] acpi/arm64: Add GTDT table parse driver fu.wei
2016-12-21 6:46 ` [PATCH v19 12/15] clocksource/drivers/arm_arch_timer: Simplify ACPI support code fu.wei
2016-12-21 6:46 ` [PATCH v19 13/15] acpi/arm64: Add memory-mapped timer support in GTDT driver fu.wei
2016-12-21 6:46 ` [PATCH v19 14/15] clocksource/drivers/arm_arch_timer: Add GTDT support for memory-mapped timer fu.wei
2016-12-21 6:46 ` [PATCH v19 15/15] acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver fu.wei
2017-01-16 6:26 ` [PATCH v19 00/15] acpi, clocksource: add GTDT driver and GTDT support in arm_arch_timer Fu Wei
2017-01-16 12:01 ` Mark Rutland
2017-01-16 12:04 ` Fu Wei
2017-01-16 17:00 ` Mark Rutland
2017-01-17 9:14 ` Fu Wei
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