The existing driver does not support System Memory so
adding support of system meory so that this can be used
on platforms which has ACPI_ADR_SPACE_SYSTEM_MEMORY type
system registers.
Function that creates sysfs entries in processor_driver in Linux,
is enabled to be compiled for arm64 platform
Signed-off-by: Tanveer <tanveer.a...@puresoftware.com>
Signed-off-by: kuldip dwivedi <kuldip.dwiv...@puresoftware.com>
---
Notes:
1. Added package in CPU.asl in edk2-platform to support
_PCT: Performance Control and provide cluster status/control
register like below..
Name(_PTC, Package () {
ResourceTemplate() {Register(SystemMemory, 32, 0, CPU_CLK_CSSR_REG,
CPU_DWORD_ACCESS)},
ResourceTemplate() {Register(SystemMemory, 32, 0, CPU_CLK_CSSR_REG,
CPU_DWORD_ACCESS)}
})
for reference please see line:100 to line:105
https://source.codeaurora.org/external/qoriq/qoriq-components/edk2-platforms/tree/Platform/NXP/LS1046aRdbPkg/AcpiTables/Dsdt/CPU.asl?h=LX2160_UEFI_ACPI_EAR3
2. This feature is tested on LS1046A platform
drivers/acpi/Kconfig | 2 +-
drivers/acpi/processor_throttling.c | 24 ++++++++++++++++++++++++
2 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 7540a5179a47..78b3e45f05e0 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -274,7 +274,7 @@ config ACPI_PROCESSOR
tristate "Processor"
depends on X86 || IA64 || ARM64
select ACPI_PROCESSOR_IDLE
- select ACPI_CPU_FREQ_PSS if X86 || IA64
+ select ACPI_CPU_FREQ_PSS if X86 || IA64 || ARM64
default y
help
This driver adds support for the ACPI Processor package. It is
required
diff --git a/drivers/acpi/processor_throttling.c
b/drivers/acpi/processor_throttling.c
index a0bd56ece3ff..8ace1fb76712 100644
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -767,6 +767,7 @@ static int acpi_read_throttling_status(struct
acpi_processor *pr,
{
u32 bit_width, bit_offset;
u32 ptc_value;
+ u64 ptc_value_64;
u64 ptc_mask;
struct acpi_processor_throttling *throttling;
int ret = -1;
@@ -784,6 +785,17 @@ static int acpi_read_throttling_status(struct
acpi_processor *pr,
*value = (u64) ((ptc_value >> bit_offset) & ptc_mask);
ret = 0;
break;
+ case ACPI_ADR_SPACE_SYSTEM_MEMORY:
+ bit_width = throttling->status_register.bit_width;
+ bit_offset = throttling->status_register.bit_offset;
+
+ acpi_os_read_memory((acpi_physical_address)
+ throttling->status_register.address,
+ &ptc_value_64, (u32) (bit_width + bit_offset));
+ ptc_mask = (1UL << bit_width) - 1;
+ *value = (u64) ((ptc_value_64 >> bit_offset) & ptc_mask);
+ ret = 0;
+ break;
case ACPI_ADR_SPACE_FIXED_HARDWARE:
ret = acpi_throttling_rdmsr(value);
break;
@@ -817,6 +829,18 @@ static int acpi_write_throttling_state(struct
acpi_processor *pr,
(u32) (bit_width + bit_offset));
ret = 0;
break;
+ case ACPI_ADR_SPACE_SYSTEM_MEMORY:
+ bit_width = throttling->control_register.bit_width;
+ bit_offset = throttling->control_register.bit_offset;
+ ptc_mask = (1UL << bit_width) - 1;
+ ptc_value = value & ptc_mask;
+
+ acpi_os_write_memory((acpi_physical_address)
+ throttling->control_register.address,
+ (u64) (ptc_value << bit_offset),
+ (u32) (bit_width + bit_offset));
+ ret = 0;
+ break;
case ACPI_ADR_SPACE_FIXED_HARDWARE:
ret = acpi_throttling_wrmsr(value);
break;
--
2.17.1
