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Date: Thu, 23 Jul 2015 16:32:39 +0800
From: Fu Wei <fu.wei@...aro.org>
To: Rafael Wysocki <rjw@...ysocki.net>
Cc: devicetree@...r.kernel.org, linux-watchdog@...r.kernel.org,
Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
linux-kernel@...r.kernel.org,
G Gregory <graeme.gregory@...aro.org>,
linux-doc@...r.kernel.org, Al Stone <al.stone@...aro.org>,
Hanjun Guo <hanjun.guo@...aro.org>,
Timur Tabi <timur@...eaurora.org>,
Ashwin Chaugule <ashwin.chaugule@...aro.org>,
Arnd Bergmann <arnd@...db.de>,
Guenter Roeck <linux@...ck-us.net>,
Vipul Gandhi <vgandhi@...eaurora.org>,
Wim Van Sebroeck <wim@...ana.be>,
Jon Masters <jcm@...hat.com>, Leo Duran <leo.duran@....com>,
Jon Corbet <corbet@....net>,
Mark Rutland <mark.rutland@....com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>, dyoung@...hat.com,
panand@...hat.com
Subject: Re: [PATCH v6 6/8] ACPI: add GTDT table parse driver into ACPI driver
Hi Rafael,
Any suggestion on the GTDT patch of this patch set?
Please let me know if I can do anything to improve it.
If it is OK for you, could you add a "Acked-by:"?
Great thanks for your time! :-)
On 23 June 2015 at 23:59, <fu.wei@...aro.org> wrote:
> From: Fu Wei <fu.wei@...aro.org>
>
> This driver adds support for parsing SBSA Generic Watchdog
> Structure in GTDT, and creating a platform device with that
> information. This allows the operating system to obtain device
> data from the resource of platform device.
>
> The platform device named "sbsa-gwdt" can be used by the
> ARM SBSA Generic Watchdog driver.
>
> Signed-off-by: Fu Wei <fu.wei@...aro.org>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> ---
> drivers/acpi/Kconfig | 9 ++++
> drivers/acpi/Makefile | 1 +
> drivers/acpi/gtdt.c | 137 ++++++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 147 insertions(+)
> create mode 100644 drivers/acpi/gtdt.c
>
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index 1bbaa3d..e125698 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -433,4 +433,13 @@ config XPOWER_PMIC_OPREGION
>
> endif
>
> +config ACPI_GTDT
> + bool "ACPI GTDT Support"
> + depends on ARM64
> + help
> + GTDT (Generic Timer Description Table) provides information
> + for per-processor timers and Platform (memory-mapped) timers
> + for ARM platforms. Select this option to provide information
> + needed for the timers init.
> +
> endif # ACPI
> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
> index 431e587..2c5a194 100644
> --- a/drivers/acpi/Makefile
> +++ b/drivers/acpi/Makefile
> @@ -96,3 +96,4 @@ obj-$(CONFIG_ACPI_EXTLOG) += acpi_extlog.o
> obj-$(CONFIG_PMIC_OPREGION) += pmic/intel_pmic.o
> obj-$(CONFIG_CRC_PMIC_OPREGION) += pmic/intel_pmic_crc.o
> obj-$(CONFIG_XPOWER_PMIC_OPREGION) += pmic/intel_pmic_xpower.o
> +obj-$(CONFIG_ACPI_GTDT) += gtdt.o
> diff --git a/drivers/acpi/gtdt.c b/drivers/acpi/gtdt.c
> new file mode 100644
> index 0000000..a92abf2
> --- /dev/null
> +++ b/drivers/acpi/gtdt.c
> @@ -0,0 +1,137 @@
> +/*
> + * ARM Specific GTDT table Support
> + *
> + * Copyright (C) 2015, Linaro Ltd.
> + * Author: Fu Wei <fu.wei@...aro.org>
> + * Hanjun Guo <hanjun.guo@...aro.org>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/device.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +
> +static int __init map_generic_timer_interrupt(u32 interrupt, u32 flags)
> +{
> + int trigger, polarity;
> +
> + if (!interrupt)
> + return 0;
> +
> + trigger = (flags & ACPI_GTDT_INTERRUPT_MODE) ? ACPI_EDGE_SENSITIVE
> + : ACPI_LEVEL_SENSITIVE;
> +
> + polarity = (flags & ACPI_GTDT_INTERRUPT_POLARITY) ? ACPI_ACTIVE_LOW
> + : ACPI_ACTIVE_HIGH;
> +
> + return acpi_register_gsi(NULL, interrupt, trigger, polarity);
> +}
> +
> +/*
> + * Initialize a SBSA generic Watchdog platform device info from GTDT
> + * According to SBSA specification the size of refresh and control
> + * frames of SBSA Generic Watchdog is SZ_4K(Offset 0x000 – 0xFFF).
> + */
> +static int __init gtdt_import_sbsa_gwdt(struct acpi_gtdt_watchdog *wd,
> + int index)
> +{
> + struct platform_device *pdev;
> + int irq = map_generic_timer_interrupt(wd->timer_interrupt,
> + wd->timer_flags);
> + struct resource res[] = {
> + DEFINE_RES_IRQ_NAMED(irq, "ws0"),
> + DEFINE_RES_MEM_NAMED(wd->refresh_frame_address, SZ_4K,
> + "refresh"),
> + DEFINE_RES_MEM_NAMED(wd->control_frame_address, SZ_4K,
> + "control"),
> + };
> +
> + pr_debug("GTDT: a Watchdog GT(0x%llx/0x%llx gsi:%u flags:0x%x)\n",
> + wd->refresh_frame_address, wd->control_frame_address,
> + wd->timer_interrupt, wd->timer_flags);
> +
> + if (!(wd->refresh_frame_address &&
> + wd->control_frame_address &&
> + wd->timer_interrupt)) {
> + pr_err("GTDT: failed geting the device info.\n");
> + return -EINVAL;
> + }
> +
> + if (irq < 0) {
> + pr_err("GTDT: failed to register GSI of the Watchdog GT.\n");
> + return -EINVAL;
> + }
> +
> + /*
> + * Add a platform device named "sbsa-gwdt" to match the platform driver.
> + * "sbsa-gwdt": SBSA(Server Base System Architecture) Generic Watchdog
> + * The platform driver (like drivers/watchdog/sbsa_gwdt.c)can get device
> + * info below by matching this name.
> + */
> + pdev = platform_device_register_simple("sbsa-gwdt", index, res,
> + ARRAY_SIZE(res));
> + if (IS_ERR(pdev)) {
> + acpi_unregister_gsi(wd->timer_interrupt);
> + return PTR_ERR(pdev);
> + }
> +
> + return 0;
> +}
> +
> +static int __init gtdt_platform_timer_parse(struct acpi_table_header *table)
> +{
> + struct acpi_gtdt_header *header;
> + struct acpi_table_gtdt *gtdt;
> + void *gtdt_subtable;
> + int i, gwdt_index;
> + int ret = 0;
> +
> + if (table->revision < 2) {
> + pr_warn("GTDT: Revision:%d doesn't support Platform Timers.\n",
> + table->revision);
> + return 0;
> + }
> +
> + gtdt = container_of(table, struct acpi_table_gtdt, header);
> + if (!gtdt->platform_timer_count) {
> + pr_info("GTDT: No Platform Timer structures.\n");
> + return 0;
> + }
> +
> + gtdt_subtable = (void *)gtdt + gtdt->platform_timer_offset;
> +
> + for (i = 0, gwdt_index = 0; i < gtdt->platform_timer_count; i++) {
> + if (gtdt_subtable > (void *)table + table->length) {
> + pr_err("GTDT: subtable pointer overflows, bad table\n");
> + return -EINVAL;
> + }
> + header = (struct acpi_gtdt_header *)gtdt_subtable;
> + if (header->type == ACPI_GTDT_TYPE_WATCHDOG) {
> + ret = gtdt_import_sbsa_gwdt(gtdt_subtable, gwdt_index);
> + if (ret)
> + pr_err("GTDT: failed to import subtable %d\n",
> + i);
> + else
> + gwdt_index++;
> + }
> + gtdt_subtable += header->length;
> + }
> +
> + return ret;
> +}
> +
> +static int __init gtdt_platform_timer_init(void)
> +{
> + if (acpi_disabled)
> + return 0;
> +
> + return acpi_table_parse(ACPI_SIG_GTDT, gtdt_platform_timer_parse);
> +}
> +
> +device_initcall(gtdt_platform_timer_init);
> --
> 1.9.1
>
--
Best regards,
Fu Wei
Software Engineer
Red Hat Software (Beijing) Co.,Ltd.Shanghai Branch
Ph: +86 21 61221326(direct)
Ph: +86 186 2020 4684 (mobile)
Room 1512, Regus One Corporate Avenue,Level 15,
One Corporate Avenue,222 Hubin Road,Huangpu District,
Shanghai,China 200021
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