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drivers: bootcount: Add ZynqMP specific bootcount support

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Add native support of the bootcount mechanism in the ZynqMP by
utilising internal PMU registers. The Persistent Global Storage
Registers of the Platform Management Unit can keep their value
during reboot cycles unless there is a POR reset, making them
appropriate for the bootcount mechanism.

Signed-off-by: Vasileios Amoiridis <vasileios.amoiridis@cern.ch>
Reviewed-by: Heiko Schocher <hs@denx.de>
Link: https://lore.kernel.org/r/20241105132744.1572759-2-vassilisamir@gmail.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
This commit is contained in:
Vasileios Amoiridis 2024-11-05 14:27:44 +01:00 • committed by Michal Simek
parent 4bd7222c6b
commit 159dfef261
5 changed files with 58 additions and 0 deletions
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1
MAINTAINERS
View file

@ -860,6 +860,7 @@ M: Michal Simek <michal.simek@amd.com>
S: Maintained
T: git https://source.denx.de/u-boot/custodians/u-boot-microblaze.git
F: arch/arm/mach-zynqmp/
F: drivers/bootcount/bootcount_zynqmp.c
F: drivers/clk/clk_zynqmp.c
F: driver/firmware/firmware-zynqmp.c
F: drivers/fpga/zynqpl.c

2
arch/arm/mach-zynqmp/include/mach/hardware.h
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@ -188,6 +188,8 @@ struct pmu_regs {
u32 gen_storage4; /* 0x40 */
u32 reserved1[1];
u32 gen_storage6; /* 0x48 */
u32 reserved2[3];
u32 pers_gen_storage2; /* 0x58 */
};
#define pmu_base ((struct pmu_regs *)ZYNQMP_PMU_BASEADDR)

7
drivers/bootcount/Kconfig
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@ -164,6 +164,13 @@ config DM_BOOTCOUNT_SYSCON
Accessing the backend is done using the regmap interface.
config DM_BOOTCOUNT_ZYNQMP
bool "Support ZynqMP PMUFW as a backing store for bootcount"
depends on ARCH_ZYNQMP
help
Enable support for the bootcount API by utilising the Persistent
Global General Storage Register 2 of the PMU.
endmenu
endif

1
drivers/bootcount/Makefile
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@ -16,3 +16,4 @@ obj-$(CONFIG_DM_BOOTCOUNT_I2C_EEPROM) += i2c-eeprom.o
obj-$(CONFIG_DM_BOOTCOUNT_I2C) += bootcount_dm_i2c.o
obj-$(CONFIG_DM_BOOTCOUNT_SPI_FLASH) += spi-flash.o
obj-$(CONFIG_DM_BOOTCOUNT_SYSCON) += bootcount_syscon.o
obj-$(CONFIG_DM_BOOTCOUNT_ZYNQMP) += bootcount_zynqmp.o

47
drivers/bootcount/bootcount_zynqmp.c Normal file
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@ -0,0 +1,47 @@
// SPDX-License-Identifier: GPL-2.0+
// SPDX-FileCopyrightText: 2024 CERN (home.cern)
#include <bootcount.h>
#include <dm.h>
#include <stdio.h>
#include <zynqmp_firmware.h>
#include <asm/arch/hardware.h>
#include <dm/platdata.h>
static int bootcount_zynqmp_set(struct udevice *dev, const u32 val)
{
int ret;
ret = zynqmp_mmio_write((ulong)&pmu_base->pers_gen_storage2, 0xFF, val);
if (ret)
pr_info("%s write fail\n", __func__);
return ret;
}
static int bootcount_zynqmp_get(struct udevice *dev, u32 *val)
{
int ret;
*val = 0;
ret = zynqmp_mmio_read((ulong)&pmu_base->pers_gen_storage2, val);
if (ret)
pr_info("%s read fail\n", __func__);
return ret;
}
U_BOOT_DRVINFO(bootcount_zynqmp) = {
.name = "bootcount_zynqmp",
};
static const struct bootcount_ops bootcount_zynqmp_ops = {
.get = bootcount_zynqmp_get,
.set = bootcount_zynqmp_set,
};
U_BOOT_DRIVER(bootcount_zynqmp) = {
.name = "bootcount_zynqmp",
.id = UCLASS_BOOTCOUNT,
.ops = &bootcount_zynqmp_ops,
};