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lib: utils: Add simple FDT based system suspend driver framework

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

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
This commit is contained in:
Anup Patel
2024-08-06 10:27:42 +05:30
committed by Anup Patel
parent 6a26726e08
commit 3676324b0e
8 changed files with 77 additions and 0 deletions
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26
include/sbi_utils/suspend/fdt_suspend.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_SUSPEND_H__
#define __FDT_SUSPEND_H__
#include <sbi/sbi_types.h>
#include <sbi_utils/fdt/fdt_driver.h>
#ifdef CONFIG_FDT_SUSPEND
void fdt_suspend_init(const void *fdt);
#else
static inline void fdt_suspend_init(const void *fdt) { }
#endif
#endif

2
lib/utils/Kconfig
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@@ -22,6 +22,8 @@ source "$(OPENSBI_SRC_DIR)/lib/utils/reset/Kconfig"
source "$(OPENSBI_SRC_DIR)/lib/utils/serial/Kconfig"
source "$(OPENSBI_SRC_DIR)/lib/utils/suspend/Kconfig"
source "$(OPENSBI_SRC_DIR)/lib/utils/sys/Kconfig"
source "$(OPENSBI_SRC_DIR)/lib/utils/timer/Kconfig"

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

22
lib/utils/suspend/fdt_suspend.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/suspend/fdt_suspend.h>
/* List of FDT suspend drivers generated at compile time */
extern const struct fdt_driver *const fdt_suspend_drivers[];
void fdt_suspend_init(const void *fdt)
{
/*
* Platforms might have multiple system suspend devices or
* might not have any so probe all and don't fail.
*/
fdt_driver_init_all(fdt, fdt_suspend_drivers);
}

3
lib/utils/suspend/fdt_suspend_drivers.carray Normal file
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@@ -0,0 +1,3 @@
HEADER: sbi_utils/suspend/fdt_suspend.h
TYPE: const struct fdt_driver
NAME: fdt_suspend_drivers

11
lib/utils/suspend/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-$(CONFIG_FDT_SUSPEND) += suspend/fdt_suspend.o
libsbiutils-objs-$(CONFIG_FDT_SUSPEND) += suspend/fdt_suspend_drivers.carray.o

1
platform/generic/configs/defconfig
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@@ -44,6 +44,7 @@ CONFIG_FDT_SERIAL_LITEX=y
CONFIG_FDT_SERIAL_UART8250=y
CONFIG_FDT_SERIAL_XILINX_UARTLITE=y
CONFIG_SERIAL_SEMIHOSTING=y
CONFIG_FDT_SUSPEND=y
CONFIG_FDT_TIMER=y
CONFIG_FDT_TIMER_MTIMER=y
CONFIG_FDT_TIMER_PLMT=y

2
platform/generic/platform.c
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@@ -24,6 +24,7 @@
#include <sbi_utils/irqchip/fdt_irqchip.h>
#include <sbi_utils/irqchip/imsic.h>
#include <sbi_utils/serial/fdt_serial.h>
#include <sbi_utils/suspend/fdt_suspend.h>
#include <sbi_utils/timer/fdt_timer.h>
#include <sbi_utils/ipi/fdt_ipi.h>
#include <sbi_utils/reset/fdt_reset.h>
@@ -247,6 +248,7 @@ static int generic_early_init(bool cold_boot)
if (cold_boot) {
fdt_reset_init(fdt);
fdt_suspend_init(fdt);
if (semihosting_enabled())
rc = semihosting_init();