diff options
| author | Vasileios Amoiridis <vasileios.amoiridis@cern.ch> | 2024-11-05 14:27:44 +0100 |
|---|---|---|
| committer | Michal Simek <michal.simek@amd.com> | 2024-11-15 14:32:47 +0100 |
| commit | 159dfef2615dcc83acf4e28bbed0387d72066b0c (patch) | |
| tree | 127e1c9ac5c0f1fed91b5d0300abaa1a6ecce97f /drivers | |
| parent | 4bd7222c6ba36715c5a4e1f6684bec63489e1acd (diff) | |
drivers: bootcount: Add ZynqMP specific bootcount support
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/bootcount/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/bootcount/Makefile | 1 | ||||
| -rw-r--r-- | drivers/bootcount/bootcount_zynqmp.c | 47 |
3 files changed, 55 insertions, 0 deletions
diff --git a/drivers/bootcount/Kconfig b/drivers/bootcount/Kconfig index fa6d8e71281..0080d2a165c 100644 --- a/drivers/bootcount/Kconfig +++ b/drivers/bootcount/Kconfig @@ -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 diff --git a/drivers/bootcount/Makefile b/drivers/bootcount/Makefile index 245f8796337..0cf79e428d6 100644 --- a/drivers/bootcount/Makefile +++ b/drivers/bootcount/Makefile @@ -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 diff --git a/drivers/bootcount/bootcount_zynqmp.c b/drivers/bootcount/bootcount_zynqmp.c new file mode 100644 index 00000000000..bc0984e2d26 --- /dev/null +++ b/drivers/bootcount/bootcount_zynqmp.c @@ -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, +}; |