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 v24 01/11] clocksource: arm_arch_timer: split dt-only rate handling Date: Sat, 15 Apr 2017 02:40:04 +0800 [thread overview] Message-ID: <20170414184014.8524-2-fu.wei@linaro.org> (raw) In-Reply-To: <20170414184014.8524-1-fu.wei@linaro.org> From: Fu Wei <fu.wei@linaro.org> For historical reasons, rate detection when probing via DT is somewhat convoluted. We tried to package this up in arch_timer_detect_rate(), but with the addition of ACPI worse, and gets in the way of stringent rate checking when ACPI is used. This patch makes arch_timer_detect_rate() specific to DT, ripping out ACPI logic. In preparation for rework of the MMIO timer probing, the reading of the relevant CNTFRQ register is factored out to callers. The function is then renamed to arch_timer_of_configure_rate(), which better represents its new place in the world. Comments are added in the DT and ACPI probe paths to explain this. 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 | 41 ++++++++++++++++++++---------------- 1 file changed, 23 insertions(+), 18 deletions(-) diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 94de018..0138b0c 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -818,24 +818,19 @@ static int arch_timer_starting_cpu(unsigned int cpu) return 0; } -static void -arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np) +/* + * For historical reasons, when probing with DT we use whichever (non-zero) + * rate was probed first, and don't verify that others match. If the first node + * probed has a clock-frequency property, this overrides the HW register. + */ +static void arch_timer_of_configure_rate(u32 rate, 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 = readl_relaxed(cntbase + CNTFRQ); - else - arch_timer_rate = arch_timer_get_cntfrq(); - } + if (of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) + arch_timer_rate = rate; /* Check the timer frequency. */ if (arch_timer_rate == 0) @@ -1166,6 +1161,7 @@ static int __init arch_timer_init(void) static int __init arch_timer_of_init(struct device_node *np) { int i; + u32 rate; if (arch_timers_present & ARCH_TIMER_TYPE_CP15) { pr_warn("multiple nodes in dt, skipping\n"); @@ -1176,7 +1172,8 @@ 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); + rate = arch_timer_get_cntfrq(); + arch_timer_of_configure_rate(rate, np); arch_timer_c3stop = !of_property_read_bool(np, "always-on"); @@ -1212,7 +1209,7 @@ static int __init arch_timer_mem_init(struct device_node *np) struct device_node *frame, *best_frame = NULL; void __iomem *cntctlbase, *base; unsigned int irq, ret = -EINVAL; - u32 cnttidr; + u32 cnttidr, rate; arch_timers_present |= ARCH_TIMER_TYPE_MEM; cntctlbase = of_iomap(np, 0); @@ -1278,7 +1275,8 @@ static int __init arch_timer_mem_init(struct device_node *np) goto out; } - arch_timer_detect_rate(base, np); + rate = readl(base + CNTFRQ); + arch_timer_of_configure_rate(rate, np); ret = arch_timer_mem_register(base, irq); if (ret) goto out; @@ -1339,8 +1337,15 @@ 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); + /* + * When probing via ACPI, we have no mechanism to override the sysreg + * CNTFRQ value. This *must* be correct. + */ + 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
WARNING: multiple messages have this Message-ID (diff)
From: fu.wei@linaro.org (fu.wei at linaro.org) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v24 01/11] clocksource: arm_arch_timer: split dt-only rate handling Date: Sat, 15 Apr 2017 02:40:04 +0800 [thread overview] Message-ID: <20170414184014.8524-2-fu.wei@linaro.org> (raw) In-Reply-To: <20170414184014.8524-1-fu.wei@linaro.org> From: Fu Wei <fu.wei@linaro.org> For historical reasons, rate detection when probing via DT is somewhat convoluted. We tried to package this up in arch_timer_detect_rate(), but with the addition of ACPI worse, and gets in the way of stringent rate checking when ACPI is used. This patch makes arch_timer_detect_rate() specific to DT, ripping out ACPI logic. In preparation for rework of the MMIO timer probing, the reading of the relevant CNTFRQ register is factored out to callers. The function is then renamed to arch_timer_of_configure_rate(), which better represents its new place in the world. Comments are added in the DT and ACPI probe paths to explain this. 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 | 41 ++++++++++++++++++++---------------- 1 file changed, 23 insertions(+), 18 deletions(-) diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 94de018..0138b0c 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -818,24 +818,19 @@ static int arch_timer_starting_cpu(unsigned int cpu) return 0; } -static void -arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np) +/* + * For historical reasons, when probing with DT we use whichever (non-zero) + * rate was probed first, and don't verify that others match. If the first node + * probed has a clock-frequency property, this overrides the HW register. + */ +static void arch_timer_of_configure_rate(u32 rate, 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 = readl_relaxed(cntbase + CNTFRQ); - else - arch_timer_rate = arch_timer_get_cntfrq(); - } + if (of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) + arch_timer_rate = rate; /* Check the timer frequency. */ if (arch_timer_rate == 0) @@ -1166,6 +1161,7 @@ static int __init arch_timer_init(void) static int __init arch_timer_of_init(struct device_node *np) { int i; + u32 rate; if (arch_timers_present & ARCH_TIMER_TYPE_CP15) { pr_warn("multiple nodes in dt, skipping\n"); @@ -1176,7 +1172,8 @@ 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); + rate = arch_timer_get_cntfrq(); + arch_timer_of_configure_rate(rate, np); arch_timer_c3stop = !of_property_read_bool(np, "always-on"); @@ -1212,7 +1209,7 @@ static int __init arch_timer_mem_init(struct device_node *np) struct device_node *frame, *best_frame = NULL; void __iomem *cntctlbase, *base; unsigned int irq, ret = -EINVAL; - u32 cnttidr; + u32 cnttidr, rate; arch_timers_present |= ARCH_TIMER_TYPE_MEM; cntctlbase = of_iomap(np, 0); @@ -1278,7 +1275,8 @@ static int __init arch_timer_mem_init(struct device_node *np) goto out; } - arch_timer_detect_rate(base, np); + rate = readl(base + CNTFRQ); + arch_timer_of_configure_rate(rate, np); ret = arch_timer_mem_register(base, irq); if (ret) goto out; @@ -1339,8 +1337,15 @@ 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); + /* + * When probing via ACPI, we have no mechanism to override the sysreg + * CNTFRQ value. This *must* be correct. + */ + 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
next prev parent reply other threads:[~2017-04-14 18:40 UTC|newest] Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-04-14 18:40 [PATCH v24 00/11] acpi, clocksource: add GTDT driver and GTDT support in arm_arch_timer fu.wei 2017-04-14 18:40 ` fu.wei at linaro.org 2017-04-14 18:40 ` fu.wei [this message] 2017-04-14 18:40 ` [PATCH v24 01/11] clocksource: arm_arch_timer: split dt-only rate handling fu.wei at linaro.org 2017-04-14 18:40 ` [PATCH v24 02/11] clocksource: arm_arch_timer: refactor arch_timer_needs_probing fu.wei 2017-04-14 18:40 ` fu.wei at linaro.org 2017-04-14 18:40 ` [PATCH v24 03/11] clocksource: arm_arch_timer: move arch_timer_needs_of_probing into DT init call fu.wei 2017-04-14 18:40 ` fu.wei at linaro.org 2017-04-14 18:40 ` [PATCH v24 04/11] clocksource: arm_arch_timer: add structs to describe MMIO timer fu.wei 2017-04-14 18:40 ` fu.wei at linaro.org [not found] ` <20170414184014.8524-1-fu.wei-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> 2017-04-14 18:40 ` [PATCH v24 05/11] clocksource: arm_arch_timer: split MMIO timer probing fu.wei-QSEj5FYQhm4dnm+yROfE0A 2017-04-14 18:40 ` fu.wei at linaro.org 2017-04-14 18:40 ` fu.wei 2017-04-14 18:40 ` [PATCH v24 06/11] acpi/arm64: Add GTDT table parse driver fu.wei-QSEj5FYQhm4dnm+yROfE0A 2017-04-14 18:40 ` fu.wei at linaro.org 2017-04-14 18:40 ` fu.wei 2017-04-14 18:40 ` [PATCH v24 07/11] clocksource: arm_arch_timer: simplify ACPI support code fu.wei 2017-04-14 18:40 ` fu.wei at linaro.org 2017-04-14 18:40 ` [PATCH v24 08/11] acpi: Introduce acpi_unregister_irq function fu.wei 2017-04-14 18:40 ` fu.wei at linaro.org 2017-04-18 15:58 ` Mark Rutland 2017-04-18 15:58 ` Mark Rutland 2017-04-19 15:09 ` Mark Rutland 2017-04-19 15:09 ` Mark Rutland 2017-04-14 18:40 ` [PATCH v24 09/11] acpi/arm64: Add memory-mapped timer support in GTDT driver fu.wei 2017-04-14 18:40 ` fu.wei at linaro.org 2017-04-18 17:21 ` Lorenzo Pieralisi 2017-04-18 17:21 ` Lorenzo Pieralisi 2017-04-19 15:07 ` Mark Rutland 2017-04-19 15:07 ` Mark Rutland 2017-04-19 15:45 ` Mark Rutland 2017-04-19 15:45 ` Mark Rutland 2017-04-19 15:45 ` Mark Rutland 2017-04-19 15:56 ` Lorenzo Pieralisi 2017-04-19 15:56 ` Lorenzo Pieralisi 2017-04-19 15:56 ` Lorenzo Pieralisi 2017-04-14 18:40 ` [PATCH v24 10/11] clocksource: arm_arch_timer: add GTDT support for memory-mapped timer fu.wei 2017-04-14 18:40 ` fu.wei at linaro.org 2017-04-14 18:40 ` [PATCH v24 11/11] acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver fu.wei 2017-04-14 18:40 ` fu.wei at linaro.org 2017-04-14 18:40 ` fu.wei
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20170414184014.8524-2-fu.wei@linaro.org \ --to=fu.wei@linaro.org \ --cc=Suravee.Suthikulpanit@amd.com \ --cc=al.stone@linaro.org \ --cc=arnd@arndb.de \ --cc=catalin.marinas@arm.com \ --cc=christoffer.dall@linaro.org \ --cc=cov@codeaurora.org \ --cc=daniel.lezcano@linaro.org \ --cc=graeme.gregory@linaro.org \ --cc=hanjun.guo@linaro.org \ --cc=harba@codeaurora.org \ --cc=jcm@redhat.com \ --cc=julien.grall@arm.com \ --cc=lenb@kernel.org \ --cc=leo.duran@amd.com \ --cc=linaro-acpi@lists.linaro.org \ --cc=linux-acpi@vger.kernel.org \ --cc=linux-arm-kernel@lists.infradead.org \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-watchdog@vger.kernel.org \ --cc=linux@roeck-us.net \ --cc=lorenzo.pieralisi@arm.com \ --cc=marc.zyngier@arm.com \ --cc=mark.rutland@arm.com \ --cc=rjw@rjwysocki.net \ --cc=rruigrok@codeaurora.org \ --cc=sudeep.holla@arm.com \ --cc=tglx@linutronix.de \ --cc=timur@codeaurora.org \ --cc=tn@semihalf.com \ --cc=wei@redhat.com \ --cc=will.deacon@arm.com \ --cc=wim@iguana.be \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.