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Groups > linux.kernel > #1614224

[PATCH v23 02/11] clocksource: arm_arch_timer: split dt-only rate handling

From fu.wei@linaro.org
Newsgroups linux.kernel
Subject [PATCH v23 02/11] clocksource: arm_arch_timer: split dt-only rate handling
Date 2017-03-31 20:00 +0200
Message-ID <tr907-7Ov-59@gated-at.bofh.it> (permalink)
References <tr905-7Ov-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

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From: Fu Wei <fu.wei@linaro.org>

Currently Currently arch_timer_detect_rate() tried to handle both the
sysreg timer and MMIO timer, with DT-specific fallback code. This gets
in the way of implementing deterministic and correct rate probing when
using ACPI.

This patch moves this logic out into the (DT-specific) probe functions,
allowing different logic to be used in the ACPI case, and making it
easier to see which CNTFRQ register is being read in each case.

Signed-off-by: Fu Wei <fu.wei@linaro.org>
[Mark: reword commit message, TODO: rework comments]
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
---
 drivers/clocksource/arm_arch_timer.c | 58 +++++++++++++++++++-----------------
 1 file changed, 30 insertions(+), 28 deletions(-)

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 843f923..1b6a7e6 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -560,30 +560,6 @@ static u32 arch_timer_mem_get_cntfrq(void __iomem *cntbase)
 	return readl_relaxed(cntbase + CNTFRQ);
 }
 
-static void
-arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np)
-{
-	/* Who has more than one independent system counter? */
-	if (arch_timer_rate)
-		return;
-
-	/*
-	 * Try to determine the frequency from the device tree or CNTFRQ,
-	 * if ACPI is enabled, get the frequency from CNTFRQ ONLY.
-	 */
-	if (!acpi_disabled ||
-	    of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) {
-		if (cntbase)
-			arch_timer_rate = arch_timer_mem_get_cntfrq(cntbase);
-		else
-			arch_timer_rate = arch_timer_get_cntfrq();
-	}
-
-	/* Check the timer frequency. */
-	if (arch_timer_rate == 0)
-		pr_warn("frequency not available\n");
-}
-
 static void arch_timer_banner(unsigned type)
 {
 	pr_info("%s%s%s timer(s) running at %lu.%02luMHz (%s%s%s).\n",
@@ -958,7 +934,17 @@ 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);
+	/*
+	 * Determine the frequency of system counter:
+	 * Try to get the frequency from the device tree.
+	 * If fail, try the sysreg CNTFRQ. Then verify the frequency.
+	 */
+	if (of_property_read_u32(np, "clock-frequency", &arch_timer_rate))
+		arch_timer_rate = arch_timer_get_cntfrq();
+	if (!arch_timer_rate) {
+		pr_err(FW_BUG "frequency not available.\n");
+		return -EINVAL;
+	}
 
 	arch_timer_c3stop = !of_property_read_bool(np, "always-on");
 
@@ -1069,7 +1055,19 @@ 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 the CNTFRQ reg of MMIO timer.
+	 */
+	if (!arch_timer_rate &&
+	    of_property_read_u32(np, "clock-frequency", &arch_timer_rate))
+		arch_timer_rate = arch_timer_mem_get_cntfrq(base);
+	if (!arch_timer_rate) {
+		pr_err(FW_BUG "MMIO frequency not available.\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
 	ret = arch_timer_mem_register(base, irq);
 	if (ret)
 		goto out;
@@ -1130,8 +1128,12 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table)
 		map_generic_timer_interrupt(gtdt->non_secure_el2_interrupt,
 		gtdt->non_secure_el2_flags);
 
-	/* Get the frequency from CNTFRQ */
-	arch_timer_detect_rate(NULL, NULL);
+	/* Get the frequency from the sysreg CNTFRQ */
+	arch_timer_rate = arch_timer_get_cntfrq();
+	if (!arch_timer_rate) {
+		pr_err(FW_BUG "frequency not available.\n");
+		return -EINVAL;
+	}
 
 	arch_timer_uses_ppi = arch_timer_select_ppi();
 	if (!arch_timer_ppi[arch_timer_uses_ppi]) {
-- 
2.9.3

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Thread

[PATCH v23 00/11] acpi, clocksource: add GTDT driver and GTDT support in arm_arch_timer fu.wei@linaro.org - 2017-03-31 20:00 +0200
  [PATCH v23 06/11] clocksource: arm_arch_timer: refactor MMIO timer probing. fu.wei@linaro.org - 2017-03-31 20:00 +0200
    Re: [PATCH v23 06/11] clocksource: arm_arch_timer: refactor MMIO  timer probing. Mark Rutland <mark.rutland@arm.com> - 2017-04-05 20:50 +0200
      Re: [PATCH v23 06/11] clocksource: arm_arch_timer: refactor MMIO  timer probing. Fu Wei <fu.wei@linaro.org> - 2017-04-06 12:50 +0200
  [PATCH v23 04/11] clocksource: arm_arch_timer: move arch_timer_needs_of_probing into DT init call fu.wei@linaro.org - 2017-03-31 20:00 +0200
  [PATCH v23 08/11] clocksource: arm_arch_timer: simplify ACPI support code. fu.wei@linaro.org - 2017-03-31 20:00 +0200
  [PATCH v23 09/11] acpi/arm64: Add memory-mapped timer support in GTDT driver fu.wei@linaro.org - 2017-03-31 20:00 +0200
    Re: [PATCH v23 09/11] acpi/arm64: Add memory-mapped timer support in  GTDT driver Will Deacon <will.deacon@arm.com> - 2017-04-03 11:50 +0200
    Re: [PATCH v23 09/11] acpi/arm64: Add memory-mapped timer support in  GTDT driver Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2017-04-03 12:50 +0200
      Re: [PATCH v23 09/11] acpi/arm64: Add memory-mapped timer support in  GTDT driver Fu Wei <fu.wei@linaro.org> - 2017-04-06 19:20 +0200
    Re: [PATCH v23 09/11] acpi/arm64: Add memory-mapped timer support in  GTDT driver Mark Rutland <mark.rutland@arm.com> - 2017-04-05 20:40 +0200
      Re: [PATCH v23 09/11] acpi/arm64: Add memory-mapped timer support in  GTDT driver Mark Rutland <mark.rutland@arm.com> - 2017-04-06 12:10 +0200
      Re: [PATCH v23 09/11] acpi/arm64: Add memory-mapped timer support in  GTDT driver Fu Wei <fu.wei@linaro.org> - 2017-04-06 18:50 +0200
        Re: [PATCH v23 09/11] acpi/arm64: Add memory-mapped timer support in  GTDT driver Mark Rutland <mark.rutland@arm.com> - 2017-04-06 19:30 +0200
          Re: [PATCH v23 09/11] acpi/arm64: Add memory-mapped timer support in  GTDT driver Fu Wei <fu.wei@linaro.org> - 2017-04-06 19:50 +0200
            Re: [PATCH v23 09/11] acpi/arm64: Add memory-mapped timer support in  GTDT driver Mark Rutland <mark.rutland@arm.com> - 2017-04-06 20:00 +0200
              Re: [PATCH v23 09/11] acpi/arm64: Add memory-mapped timer support in  GTDT driver Fu Wei <fu.wei@linaro.org> - 2017-04-06 20:10 +0200
  [PATCH v23 07/11] acpi/arm64: Add GTDT table parse driver fu.wei@linaro.org - 2017-03-31 20:00 +0200
  [PATCH v23 05/11] clocksource: arm_arch_timer: add structs to describe MMIO timer fu.wei@linaro.org - 2017-03-31 20:00 +0200
  [PATCH v23 01/11] clocksource: arm_arch_timer: add MMIO CNTFRQ helper fu.wei@linaro.org - 2017-03-31 20:00 +0200
  [PATCH v23 11/11] acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver fu.wei@linaro.org - 2017-03-31 20:00 +0200
  [PATCH v23 02/11] clocksource: arm_arch_timer: split dt-only rate handling fu.wei@linaro.org - 2017-03-31 20:00 +0200
  [PATCH v23 03/11] clocksource: arm_arch_timer: refactor arch_timer_needs_probing fu.wei@linaro.org - 2017-03-31 20:00 +0200
  Re: [PATCH v23 00/11] acpi, clocksource: add GTDT driver and GTDT  support in arm_arch_timer Xiongfeng Wang <wangxiongfeng2@huawei.com> - 2017-04-01 04:20 +0200
    Re: [PATCH v23 00/11] acpi, clocksource: add GTDT driver and GTDT  support in arm_arch_timer Fu Wei <fu.wei@linaro.org> - 2017-04-01 05:50 +0200
  Re: [PATCH v23 00/11] acpi, clocksource: add GTDT driver and GTDT  support in arm_arch_timer Timur Tabi <timur@codeaurora.org> - 2017-04-04 22:40 +0200

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