[PATCH 1/1] am335x, guardian: software update available status is stored in AM3352 RTC scracth register
Lokesh Vutla
lokeshvutla at ti.com
Sun Jan 17 18:08:44 CET 2021
On 06/01/21 9:02 pm, Gireesh.Hiremath at in.bosch.com wrote:
> From: Gireesh Hiremath <Gireesh.Hiremath at in.bosch.com>
>
> RTC second scratch register[32-bit]:
> -zero byte hold boot count value
> -first byte hold update available state
> -second byte hold version
> -third byte hold magic number
>
> Signed-off-by: Gireesh Hiremath <Gireesh.Hiremath at in.bosch.com>
>
> Gbp-Pq: Topic apertis/guardian
> Gbp-Pq: Name am335x-guardian-software-update-available-status-is-store.patch
Hmm..not sure what this is..
Cover letter is not needed for a single patch btw.
> ---
> configs/am335x_guardian_defconfig | 1 +
> drivers/bootcount/Kconfig | 27 ++++++++++++--
> drivers/bootcount/Makefile | 1 +
> drivers/bootcount/bootcount_nvmem.c | 57 +++++++++++++++++++++++++++++
Please split driver and defconfig changes.
> 4 files changed, 83 insertions(+), 3 deletions(-)
> create mode 100644 drivers/bootcount/bootcount_nvmem.c
>
> diff --git a/configs/am335x_guardian_defconfig b/configs/am335x_guardian_defconfig
> index b5d8d80d14..c8336a8256 100644
> --- a/configs/am335x_guardian_defconfig
> +++ b/configs/am335x_guardian_defconfig
> @@ -71,6 +71,7 @@ CONFIG_VERSION_VARIABLE=y
> CONFIG_BOOTP_SEND_HOSTNAME=y
> CONFIG_SPL_DM=y
> CONFIG_BOOTCOUNT_LIMIT=y
> +CONFIG_BOOTCOUNT_AM33XX_NVMEM=y
> CONFIG_LED=y
> CONFIG_LED_GPIO=y
> CONFIG_MISC=y
> diff --git a/drivers/bootcount/Kconfig b/drivers/bootcount/Kconfig
> index b5ccea0d9c..d543061233 100644
> --- a/drivers/bootcount/Kconfig
> +++ b/drivers/bootcount/Kconfig
> @@ -42,6 +42,25 @@ config BOOTCOUNT_AM33XX
> This requires the RTC clocks, etc, to be enabled prior to use and
> not all boards with this IP block on it will have the RTC in use.
>
> +config BOOTCOUNT_AM33XX_NVMEM
> + bool "Boot counter in AM33XX RTC IP block with upgrade_available flag"
> + depends on AM33XX
> + select SPL_AM33XX_ENABLE_RTC32K_OSC if AM33XX
> + help
> + Add support for maintaining bootcount,upgrade_available,
> + version and BOOTMAGIC in a AM33xx RTC IP block
> + scratch register2.
> +
> + A bootcount driver for the RTC IP block found on many TI platforms.
> + This requires the RTC clocks, etc, to be enabled prior to use and
> + not all boards with this IP block on it will have the RTC in use.
> +
> + If there is upgrade in software then "upgrade_available" is 1,
> + "bootcount" is incremented otherwise "upgrade_available" and
> + "bootcount" is always 0. So the Userspace Application must set
> + the "upgrade_available" and "bootcount" variable to 0, if a boot
> + was successfully.
> +
Isn't it possible to re-use drivers/bootcount/bootcount_davinci.c?
Thanks and regards,
Lokesh
> config BOOTCOUNT_ENV
> bool "Boot counter in environment"
> help
> @@ -177,16 +196,18 @@ config SYS_BOOTCOUNT_EXT_NAME
>
> config SYS_BOOTCOUNT_ADDR
> hex "RAM address used for reading and writing the boot counter"
> - default 0x44E3E000 if BOOTCOUNT_AM33XX
> + default 0x44E3E000 if BOOTCOUNT_AM33XX || BOOTCOUNT_AM33XX_NVMEM
> default 0xE0115FF8 if ARCH_LS1043A || ARCH_LS1021A
> depends on BOOTCOUNT_AM33XX || BOOTCOUNT_GENERIC || BOOTCOUNT_EXT || \
> - BOOTCOUNT_I2C
> + BOOTCOUNT_I2C || BOOTCOUNT_AM33XX_NVMEM
> help
> Set the address used for reading and writing the boot counter.
>
> config SYS_BOOTCOUNT_MAGIC
> hex "Magic value for the boot counter"
> - default 0xB001C041
> + default 0xB001C041 if BOOTCOUNT_AM33XX
> + default 0xB0 if BOOTCOUNT_AM33XX_NVMEM
> + depends on BOOTCOUNT_AM33XX || BOOTCOUNT_AM33XX_NVMEM
> help
> Set the magic value used for the boot counter.
>
> diff --git a/drivers/bootcount/Makefile b/drivers/bootcount/Makefile
> index 51d860b00e..12658ffdce 100644
> --- a/drivers/bootcount/Makefile
> +++ b/drivers/bootcount/Makefile
> @@ -8,6 +8,7 @@ obj-$(CONFIG_BOOTCOUNT_RAM) += bootcount_ram.o
> obj-$(CONFIG_BOOTCOUNT_ENV) += bootcount_env.o
> obj-$(CONFIG_BOOTCOUNT_I2C) += bootcount_i2c.o
> obj-$(CONFIG_BOOTCOUNT_EXT) += bootcount_ext.o
> +obj-$(CONFIG_BOOTCOUNT_AM33XX_NVMEM) += bootcount_nvmem.o
>
> obj-$(CONFIG_DM_BOOTCOUNT) += bootcount-uclass.o
> obj-$(CONFIG_DM_BOOTCOUNT_RTC) += rtc.o
> diff --git a/drivers/bootcount/bootcount_nvmem.c b/drivers/bootcount/bootcount_nvmem.c
> new file mode 100644
> index 0000000000..5f266d5ec8
> --- /dev/null
> +++ b/drivers/bootcount/bootcount_nvmem.c
> @@ -0,0 +1,57 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * (C) Copyright 2011
> + * Heiko Schocher, DENX Software Engineering, hs at denx.de.
> + * (C) Copyright 2018 Robert Bosch Power Tools GmbH.
> + *
> + * A bootcount driver for the RTC IP block found on many TI platforms.
> + * This requires the RTC clocks, etc, to be enabled prior to use and
> + * not all boards with this IP block on it will have the RTC in use.
> + */
> +
> +#include <bootcount.h>
> +#include <asm/davinci_rtc.h>
> +
> +#define BC_VERSION 2
> +
> +void bootcount_store(ulong bootcount)
> +{
> + u8 upgrade_available = 0;
> + ulong val = 0;
> + struct davinci_rtc *reg =
> + (struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
> +
> + val = raw_bootcount_load(®->scratch2);
> + upgrade_available = (val >> 8) & 0x000000ff;
> +
> + /* Only update bootcount during upgrade process */
> + if (!upgrade_available)
> + bootcount = 0;
> +
> + val = (bootcount & 0x000000ff) |
> + (upgrade_available << 8) |
> + (BC_VERSION << 16) |
> + (CONFIG_SYS_BOOTCOUNT_MAGIC << 24);
> +
> + /*
> + * write RTC kick registers to enable write
> + * for RTC Scratch registers. Scratch register 2 is
> + * used for bootcount value.
> + */
> + writel(RTC_KICK0R_WE, ®->kick0r);
> + writel(RTC_KICK1R_WE, ®->kick1r);
> + raw_bootcount_store(®->scratch2, val);
> +}
> +
> +ulong bootcount_load(void)
> +{
> + unsigned long val = 0;
> + struct davinci_rtc *reg =
> + (struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
> +
> + val = raw_bootcount_load(®->scratch2);
> + if ((val >> 24) != CONFIG_SYS_BOOTCOUNT_MAGIC)
> + return 0;
> + else
> + return val & 0x000000ff;
> +}
>
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