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lib: utils: Add simple FDT based CPPC driver framework

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The generic platform can have multiple CPPC drivers so add a simple
FDT based CPPC driver framework.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
This commit is contained in:
Anup Patel
2024-08-07 10:47:18 +05:30
committed by Anup Patel
parent 33ee9b8240
commit 54e632b72e
8 changed files with 77 additions and 0 deletions
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26
include/sbi_utils/cppc/fdt_cppc.h Normal file
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@@ -0,0 +1,26 @@
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2024 Ventana Micro Systems Inc.
*
* Authors:
* Anup Patel <apatel@ventanamicro.com>
*/
#ifndef __FDT_CPPC_H__
#define __FDT_CPPC_H__
#include <sbi/sbi_types.h>
#include <sbi_utils/fdt/fdt_driver.h>
#ifdef CONFIG_FDT_CPPC
void fdt_cppc_init(const void *fdt);
#else
static inline void fdt_cppc_init(const void *fdt) { }
#endif
#endif

2
lib/utils/Kconfig
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@@ -2,6 +2,8 @@
menu "Utils and Drivers Support"
source "$(OPENSBI_SRC_DIR)/lib/utils/cppc/Kconfig"
source "$(OPENSBI_SRC_DIR)/lib/utils/fdt/Kconfig"
source "$(OPENSBI_SRC_DIR)/lib/utils/gpio/Kconfig"

10
lib/utils/cppc/Kconfig Normal file
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@@ -0,0 +1,10 @@
# SPDX-License-Identifier: BSD-2-Clause
menu "CPPC Device Support"
config FDT_CPPC
bool "FDT based CPPC drivers"
depends on FDT
default n
endmenu

22
lib/utils/cppc/fdt_cppc.c Normal file
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@@ -0,0 +1,22 @@
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2024 Ventana Micro Systems Inc.
*
* Authors:
* Anup Patel <apatel@ventanamicro.com>
*/
#include <sbi_utils/cppc/fdt_cppc.h>
/* List of FDT CPPC drivers generated at compile time */
extern const struct fdt_driver *const fdt_cppc_drivers[];
void fdt_cppc_init(const void *fdt)
{
/*
* Platforms might have multiple CPPC devices or might
* not have any so probe all and don't fail.
*/
fdt_driver_init_all(fdt, fdt_cppc_drivers);
}

3
lib/utils/cppc/fdt_cppc_drivers.carray Normal file
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@@ -0,0 +1,3 @@
HEADER: sbi_utils/cppc/fdt_cppc.h
TYPE: const struct fdt_driver
NAME: fdt_cppc_drivers

11
lib/utils/cppc/objects.mk Normal file
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@@ -0,0 +1,11 @@
#
# SPDX-License-Identifier: BSD-2-Clause
#
# Copyright (c) 2024 Ventana Micro Systems Inc.
#
# Authors:
# Anup Patel <apatel@ventanamicro.com>
#
libsbiutils-objs-$(CONFIG_FDT_CPPC) += cppc/fdt_cppc.o
libsbiutils-objs-$(CONFIG_FDT_CPPC) += cppc/fdt_cppc_drivers.carray.o

1
platform/generic/configs/defconfig
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@@ -6,6 +6,7 @@ CONFIG_PLATFORM_SIFIVE_FU740=y
CONFIG_PLATFORM_SOPHGO_SG2042=y
CONFIG_PLATFORM_STARFIVE_JH7110=y
CONFIG_PLATFORM_THEAD=y
CONFIG_FDT_CPPC=y
CONFIG_FDT_GPIO=y
CONFIG_FDT_GPIO_DESIGNWARE=y
CONFIG_FDT_GPIO_SIFIVE=y

2
platform/generic/platform.c
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@@ -17,6 +17,7 @@
#include <sbi/sbi_string.h>
#include <sbi/sbi_system.h>
#include <sbi/sbi_tlb.h>
#include <sbi_utils/cppc/fdt_cppc.h>
#include <sbi_utils/fdt/fdt_domain.h>
#include <sbi_utils/fdt/fdt_fixup.h>
#include <sbi_utils/fdt/fdt_helper.h>
@@ -251,6 +252,7 @@ static int generic_early_init(bool cold_boot)
fdt_reset_init(fdt);
fdt_suspend_init(fdt);
fdt_hsm_init(fdt);
fdt_cppc_init(fdt);
if (semihosting_enabled())
rc = semihosting_init();