From: Fu Wei <[email protected]> This driver adds support for parsing all kinds of timer in GTDT: (1)arch timer: provide a kernel API to parse all the PPIs and always-on info in GTDT and export them by filling the structs which provided by parameters(pointer of them).
(2)memory-mapped timer: provide a kernel APIs to parse GT Block Structure in GTDT, export all the timer info by filling the struct which provided by parameter(pointer of the struct). (3)SBSA Generic Watchdog: 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. By this driver, we can simplify all the relevant drivers, and separate all the ACPI GTDT knowledge from them. Signed-off-by: Fu Wei <[email protected]> Signed-off-by: Hanjun Guo <[email protected]> --- drivers/acpi/Kconfig | 9 + drivers/acpi/Makefile | 1 + drivers/acpi/acpi_gtdt.c | 309 +++++++++++++++++++++++++++++++++++ include/clocksource/arm_arch_timer.h | 16 ++ include/linux/acpi.h | 6 + 5 files changed, 341 insertions(+) diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index b7e2e77..27a5cf9 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -521,4 +521,13 @@ 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 251ce85..848aa8a 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -99,5 +99,6 @@ 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) += acpi_gtdt.o video-objs += acpi_video.o video_detect.o diff --git a/drivers/acpi/acpi_gtdt.c b/drivers/acpi/acpi_gtdt.c new file mode 100644 index 0000000..e54fadf --- /dev/null +++ b/drivers/acpi/acpi_gtdt.c @@ -0,0 +1,309 @@ +/* + * ARM Specific GTDT table Support + * + * Copyright (C) 2015, Linaro Ltd. + * Author: Fu Wei <[email protected]> + * Hanjun Guo <[email protected]> + * + * 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> + +#include <clocksource/arm_arch_timer.h> + +#undef pr_fmt +#define pr_fmt(fmt) "GTDT: " fmt + +typedef int (*platform_timer_handler)(void *platform_timer, int index, + void *data); + +static void *platform_timer_struct __initdata; +static u32 platform_timer_count __initdata; +static void *gtdt_end __initdata; + +static int __init for_platform_timer(enum acpi_gtdt_type type, + platform_timer_handler handler, void *data) +{ + struct acpi_gtdt_header *header; + int i, index, ret; + void *platform_timer = platform_timer_struct; + + for (i = 0, index = 0; i < platform_timer_count; i++) { + if (platform_timer > gtdt_end) { + pr_err(FW_BUG "subtable pointer overflows.\n"); + platform_timer_count = i; + break; + } + header = (struct acpi_gtdt_header *)platform_timer; + if (header->type == type) { + ret = handler(platform_timer, index, data); + if (ret) + pr_err("failed to handler subtable %d.\n", i); + else + index++; + } + platform_timer += header->length; + } + + return index; +} + +/* + * Get some basic info from GTDT table, and init the global variables above + * for all timers initialization of Generic Timer. + * This function does some validation on GTDT table, and will be run only once. + */ +static void __init platform_timer_init(struct acpi_table_header *table, + struct acpi_table_gtdt *gtdt) +{ + gtdt_end = (void *)table + table->length; + + if (table->revision < 2) { + pr_info("Revision:%d doesn't support Platform Timers.\n", + table->revision); + return; + } + + platform_timer_count = gtdt->platform_timer_count; + if (!platform_timer_count) { + pr_info("No Platform Timer structures.\n"); + return; + } + + platform_timer_struct = (void *)gtdt + gtdt->platform_timer_offset; + if (platform_timer_struct < (void *)table + + sizeof(struct acpi_table_gtdt)) { + pr_err(FW_BUG "Platform Timer pointer error.\n"); + platform_timer_struct = NULL; + platform_timer_count = 0; + } +} + +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); +} + +/* + * Get the necessary info of arch_timer from GTDT table. + */ +int __init gtdt_arch_timer_init(struct acpi_table_header *table, int *ppi, + bool *c3stop, u32 *timer_count) +{ + struct acpi_table_gtdt *gtdt; + + if (acpi_disabled || !table || !ppi || !c3stop) + return -EINVAL; + + gtdt = container_of(table, struct acpi_table_gtdt, header); + if (!gtdt) { + pr_err("table pointer error.\n"); + return -EINVAL; + } + + ppi[PHYS_SECURE_PPI] = + map_generic_timer_interrupt(gtdt->secure_el1_interrupt, + gtdt->secure_el1_flags); + + ppi[PHYS_NONSECURE_PPI] = + map_generic_timer_interrupt(gtdt->non_secure_el1_interrupt, + gtdt->non_secure_el1_flags); + + ppi[VIRT_PPI] = + map_generic_timer_interrupt(gtdt->virtual_timer_interrupt, + gtdt->virtual_timer_flags); + + ppi[HYP_PPI] = + map_generic_timer_interrupt(gtdt->non_secure_el2_interrupt, + gtdt->non_secure_el2_flags); + + *c3stop = !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON); + + platform_timer_init(table, gtdt); + if (timer_count) + *timer_count = platform_timer_count; + + return 0; +} + +/* + * Helper function for getting the pointer of a timer frame in GT block. + */ +static void __init *gtdt_gt_timer_frame(struct acpi_gtdt_timer_block *gt_block, + int index) +{ + void *timer_frame = (void *)gt_block + gt_block->timer_offset + + sizeof(struct acpi_gtdt_timer_entry) * index; + + if (timer_frame <= (void *)gt_block + gt_block->header.length - + sizeof(struct acpi_gtdt_timer_entry)) + return timer_frame; + + return NULL; +} + +static int __init gtdt_parse_gt_block(void *platform_timer, int index, + void *data) +{ + struct acpi_gtdt_timer_block *block; + struct acpi_gtdt_timer_entry *frame; + struct gt_block_data *block_data; + int i, j; + + if (!platform_timer || !data) + return -EINVAL; + + block = platform_timer; + block_data = data + sizeof(struct gt_block_data) * index; + + if (!block->block_address || !block->timer_count) { + pr_err(FW_BUG "invalid GT Block data.\n"); + return -EINVAL; + } + block_data->cntctlbase_phy = (phys_addr_t)block->block_address; + block_data->timer_count = block->timer_count; + + /* + * Get the GT timer Frame data for every GT Block Timer + */ + for (i = 0, j = 0; i < block->timer_count; i++) { + frame = gtdt_gt_timer_frame(block, i); + if (!frame || !frame->base_address || !frame->timer_interrupt) { + pr_err(FW_BUG "invalid GT Block Timer data, skip.\n"); + continue; + } + block_data->timer[j].frame_nr = frame->frame_number; + block_data->timer[j].cntbase_phy = frame->base_address; + block_data->timer[j].irq = map_generic_timer_interrupt( + frame->timer_interrupt, + frame->timer_flags); + if (frame->virtual_timer_interrupt) + block_data->timer[j].virt_irq = + map_generic_timer_interrupt( + frame->virtual_timer_interrupt, + frame->virtual_timer_flags); + j++; + } + + if (j) + return 0; + + block_data->cntctlbase_phy = (phys_addr_t)NULL; + block_data->timer_count = 0; + + return -EINVAL; +} + +/* + * Get the GT block info for memory-mapped timer from GTDT table. + * Please make sure we have called gtdt_arch_timer_init, because it helps to + * init the global variables. + */ +int __init gtdt_arch_timer_mem_init(struct gt_block_data *data) +{ + int ret = for_platform_timer(ACPI_GTDT_TYPE_TIMER_BLOCK, + gtdt_parse_gt_block, (void *)data); + + pr_info("found %d memory-mapped timer block.\n", ret); + + return ret; +} + +/* + * Initialize a SBSA generic Watchdog platform device info from GTDT + */ +static int __init gtdt_import_sbsa_gwdt(void *platform_timer, + int index, void *data) +{ + struct platform_device *pdev; + struct acpi_gtdt_watchdog *wd = platform_timer; + int irq = map_generic_timer_interrupt(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("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)) { + pr_err(FW_BUG "failed getting the Watchdog GT frame addr.\n"); + return -EINVAL; + } + + if (!wd->timer_interrupt) + pr_warn(FW_BUG "failed getting the Watchdog GT GSIV.\n"); + else if (irq <= 0) + pr_warn("failed to map the Watchdog GT GSIV.\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) +{ + struct acpi_table_header *table; + struct acpi_table_gtdt *gtdt; + int ret; + + if (acpi_disabled) + return 0; + + if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_GTDT, 0, &table))) + return -EINVAL; + + /* global variables initialization */ + gtdt_end = (void *)table + table->length; + gtdt = container_of(table, struct acpi_table_gtdt, header); + platform_timer_struct = (void *)gtdt + gtdt->platform_timer_offset; + + ret = for_platform_timer(ACPI_GTDT_TYPE_WATCHDOG, + gtdt_import_sbsa_gwdt, NULL); + pr_info("found %d SBSA generic Watchdog.\n", ret); + + return 0; +} + +device_initcall(gtdt_sbsa_gwdt_init); diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h index 16dcd10..4e5b2a2 100644 --- a/include/clocksource/arm_arch_timer.h +++ b/include/clocksource/arm_arch_timer.h @@ -21,6 +21,7 @@ #define ARCH_CP15_TIMER BIT(0) #define ARCH_MEM_TIMER BIT(1) +#define ARCH_WD_TIMER BIT(2) #define ARCH_TIMER_CTRL_ENABLE (1 << 0) #define ARCH_TIMER_CTRL_IT_MASK (1 << 1) @@ -56,6 +57,8 @@ enum spi_nr { #define ARCH_TIMER_MEM_PHYS_ACCESS 2 #define ARCH_TIMER_MEM_VIRT_ACCESS 3 +#define ARCH_TIMER_MEM_MAX_FRAME 8 + #define ARCH_TIMER_USR_PCT_ACCESS_EN (1 << 0) /* physical counter */ #define ARCH_TIMER_USR_VCT_ACCESS_EN (1 << 1) /* virtual counter */ #define ARCH_TIMER_VIRT_EVT_EN (1 << 2) @@ -71,6 +74,19 @@ struct arch_timer_kvm_info { int virtual_irq; }; +struct gt_timer_data { + int frame_nr; + phys_addr_t cntbase_phy; + int irq; + int virt_irq; +}; + +struct gt_block_data { + phys_addr_t cntctlbase_phy; + int timer_count; + struct gt_timer_data timer[ARCH_TIMER_MEM_MAX_FRAME]; +}; + #ifdef CONFIG_ARM_ARCH_TIMER extern u32 arch_timer_get_rate(void); diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 288fac5..53b35d4 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -532,6 +532,12 @@ void acpi_walk_dep_device_list(acpi_handle handle); struct platform_device *acpi_create_platform_device(struct acpi_device *); #define ACPI_PTR(_ptr) (_ptr) +#ifdef CONFIG_ACPI_GTDT +int __init gtdt_arch_timer_init(struct acpi_table_header *table, int *ppi, + bool *c3stop, u32 *timer_count); +int __init gtdt_arch_timer_mem_init(struct gt_block_data *data); +#endif + #else /* !CONFIG_ACPI */ #define acpi_disabled 1 -- 2.5.5
