From: Fu Wei fu.wei@linaro.org
This driver adds support for parsing SBSA Generic Watchdog timer in GTDT, parse all info in 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@linaro.org Signed-off-by: Hanjun Guo hanjun.guo@linaro.org Tested-by: Xiongfeng Wang wangxiongfeng2@huawei.com --- drivers/acpi/arm64/gtdt.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++ drivers/watchdog/Kconfig | 1 + 2 files changed, 101 insertions(+)
diff --git a/drivers/acpi/arm64/gtdt.c b/drivers/acpi/arm64/gtdt.c index 08d9506..69483f6 100644 --- a/drivers/acpi/arm64/gtdt.c +++ b/drivers/acpi/arm64/gtdt.c @@ -14,6 +14,7 @@ #include <linux/acpi.h> #include <linux/init.h> #include <linux/kernel.h> +#include <linux/platform_device.h>
#include <clocksource/arm_arch_timer.h>
@@ -66,6 +67,14 @@ static inline bool is_watchdog(void *platform_timer) return gh->type == ACPI_GTDT_TYPE_WATCHDOG; }
+static inline struct acpi_gtdt_watchdog *get_watchdog(unsigned int index) +{ + if (index >= acpi_gtdt_desc.watchdog_count || !watchdog) + return NULL; + + return watchdog[index]; +} + static int __init map_gt_gsi(u32 interrupt, u32 flags) { int trigger, polarity; @@ -309,3 +318,94 @@ int __init gtdt_arch_timer_mem_init(struct arch_timer_mem *data,
return 0; } + +/* + * Initialize a SBSA generic Watchdog platform device info from GTDT + */ +static int __init gtdt_import_sbsa_gwdt(struct acpi_gtdt_watchdog *wd, + int index) +{ + struct platform_device *pdev; + int irq = map_gt_gsi(wd->timer_interrupt, wd->timer_flags); + int no_irq = 1; + + /* + * According to SBSA specification the size of refresh and control + * frames of SBSA Generic Watchdog is SZ_4K(Offset 0x000 – 0xFFF). + */ + struct resource res[] = { + DEFINE_RES_MEM(wd->control_frame_address, SZ_4K), + DEFINE_RES_MEM(wd->refresh_frame_address, SZ_4K), + DEFINE_RES_IRQ(irq), + }; + + pr_debug("found a Watchdog (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)) { + pr_err(FW_BUG "failed to get the Watchdog base address.\n"); + return -EINVAL; + } + + if (!wd->timer_interrupt) + pr_warn(FW_BUG "failed to get the Watchdog interrupt.\n"); + else if (irq <= 0) + pr_warn("failed to map the Watchdog interrupt.\n"); + else + no_irq = 0; + + /* + * 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) - no_irq); + if (IS_ERR(pdev)) { + acpi_unregister_gsi(wd->timer_interrupt); + return PTR_ERR(pdev); + } + + return 0; +} + +static int __init gtdt_sbsa_gwdt_init(void) +{ + int i, ret; + struct acpi_table_header *table; + struct acpi_gtdt_watchdog *watchdog; + + if (acpi_disabled) + return 0; + + if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_GTDT, 0, &table))) + return -EINVAL; + + ret = acpi_gtdt_init(table); + if (ret) + return ret; + + if (!acpi_gtdt_desc.watchdog_count) + return 0; + + for (i = 0; i < acpi_gtdt_desc.watchdog_count; i++) { + watchdog = get_watchdog(i); + if (!watchdog) { + ret = -ENODEV; + break; + } + ret = gtdt_import_sbsa_gwdt(watchdog, i); + if (ret) + break; + } + + pr_info("found %d SBSA generic Watchdog(s), %d imported.\n", + acpi_gtdt_desc.watchdog_count, i); + + acpi_gtdt_release(); + return ret; +} + +device_initcall(gtdt_sbsa_gwdt_init); diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index fdd3228..e5ba1f0 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -218,6 +218,7 @@ config ARM_SBSA_WATCHDOG tristate "ARM SBSA Generic Watchdog" depends on ARM64 depends on ARM_ARCH_TIMER + depends on ACPI_GTDT || !ACPI select WATCHDOG_CORE help ARM SBSA Generic Watchdog has two stage timeouts: