diff options
| -rw-r--r-- | drivers/acpi/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/acpi/Makefile | 1 | ||||
| -rw-r--r-- | drivers/acpi/acpi_ffh.c | 55 | ||||
| -rw-r--r-- | drivers/acpi/bus.c | 6 | ||||
| -rw-r--r-- | include/linux/acpi.h | 7 |
5 files changed, 79 insertions, 0 deletions
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 473241b5193f..06508674a30b 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -564,6 +564,16 @@ config ACPI_PCC Enable this feature if you want to set up and install the PCC Address Space handler to handle PCC OpRegion in the firmware. +config ACPI_FFH + bool "ACPI FFH Address Space" + default n + help + The FFH(Fixed Function Hardware) Address Space also referred as FFH + Operation Region allows to define platform specific opregion. + + Enable this feature if you want to set up and install the FFH Address + Space handler to handle FFH OpRegion in the firmware. + source "drivers/acpi/pmic/Kconfig" config ACPI_VIOT diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 0002eecbf870..feb36c0b9446 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -68,6 +68,7 @@ acpi-$(CONFIG_ACPI_GENERIC_GSI) += irq.o acpi-$(CONFIG_ACPI_WATCHDOG) += acpi_watchdog.o acpi-$(CONFIG_ACPI_PRMT) += prmt.o acpi-$(CONFIG_ACPI_PCC) += acpi_pcc.o +acpi-$(CONFIG_ACPI_FFH) += acpi_ffh.o # Address translation acpi-$(CONFIG_ACPI_ADXL) += acpi_adxl.o diff --git a/drivers/acpi/acpi_ffh.c b/drivers/acpi/acpi_ffh.c new file mode 100644 index 000000000000..19aff808bbb8 --- /dev/null +++ b/drivers/acpi/acpi_ffh.c @@ -0,0 +1,55 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Author: Sudeep Holla <sudeep.holla@arm.com> + * Copyright 2022 Arm Limited + */ +#include <linux/kernel.h> +#include <linux/acpi.h> +#include <linux/completion.h> +#include <linux/idr.h> +#include <linux/io.h> + +#include <linux/arm-smccc.h> + +static struct acpi_ffh_info ffh_ctx; + +int __weak acpi_ffh_address_space_arch_setup(void *handler_ctxt, + void **region_ctxt) +{ + return -EOPNOTSUPP; +} + +int __weak acpi_ffh_address_space_arch_handler(acpi_integer *value, + void *region_context) +{ + return -EOPNOTSUPP; +} + +static acpi_status +acpi_ffh_address_space_setup(acpi_handle region_handle, u32 function, + void *handler_context, void **region_context) +{ + return acpi_ffh_address_space_arch_setup(handler_context, + region_context); +} + +static acpi_status +acpi_ffh_address_space_handler(u32 function, acpi_physical_address addr, + u32 bits, acpi_integer *value, + void *handler_context, void *region_context) +{ + return acpi_ffh_address_space_arch_handler(value, region_context); +} + +void __init acpi_init_ffh(void) +{ + acpi_status status; + + status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, + ACPI_ADR_SPACE_FIXED_HARDWARE, + &acpi_ffh_address_space_handler, + &acpi_ffh_address_space_setup, + &ffh_ctx); + if (ACPI_FAILURE(status)) + pr_alert("OperationRegion handler could not be installed\n"); +} diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index d466c8195314..245fb0828e47 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -300,6 +300,8 @@ EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed); bool osc_sb_cppc2_support_acked; +bool osc_sb_ffh_opregion_support_confirmed; + static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; static void acpi_bus_osc_negotiate_platform_control(void) { @@ -383,6 +385,8 @@ static void acpi_bus_osc_negotiate_platform_control(void) capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT; osc_cpc_flexible_adr_space_confirmed = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPC_FLEXIBLE_ADR_SPACE; + osc_sb_ffh_opregion_support_confirmed = + capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_FFH_OPR_SUPPORT; } kfree(context.ret.pointer); @@ -1408,6 +1412,8 @@ static int __init acpi_init(void) disable_acpi(); return result; } + if (osc_sb_ffh_opregion_support_confirmed) + acpi_init_ffh(); pci_mmcfg_late_init(); acpi_iort_init(); diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 3015235d65e3..c026c1129cba 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -586,6 +586,7 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context); #define OSC_SB_CPC_FLEXIBLE_ADR_SPACE 0x00004000 #define OSC_SB_NATIVE_USB4_SUPPORT 0x00040000 #define OSC_SB_PRM_SUPPORT 0x00200000 +#define OSC_SB_FFH_OPR_SUPPORT 0x00400000 extern bool osc_sb_apei_support_acked; extern bool osc_pc_lpi_support_confirmed; @@ -1488,6 +1489,12 @@ void acpi_init_pcc(void); static inline void acpi_init_pcc(void) { } #endif +#ifdef CONFIG_ACPI_FFH +void acpi_init_ffh(void); +#else +static inline void acpi_init_ffh(void) { } +#endif + #ifdef CONFIG_ACPI extern void acpi_device_notify(struct device *dev); extern void acpi_device_notify_remove(struct device *dev); |