Use the MEMA - MEMD registers on the PFUZE100 as bootcount registers. Based on work from Heiko Schocher <h...@denx.de>. Signed-off-by: Philip Oberfichtner <p...@denx.de>
--- drivers/bootcount/Kconfig | 7 ++ drivers/bootcount/Makefile | 1 + drivers/bootcount/bootcount_pmic_pfuze100.c | 83 +++++++++++++++++++++ 3 files changed, 91 insertions(+) create mode 100644 drivers/bootcount/bootcount_pmic_pfuze100.c diff --git a/drivers/bootcount/Kconfig b/drivers/bootcount/Kconfig index 607027c968..9c37fa8ec8 100644 --- a/drivers/bootcount/Kconfig +++ b/drivers/bootcount/Kconfig @@ -73,6 +73,13 @@ config BOOTCOUNT_ENV So the Userspace Application must set the "upgrade_available" and "bootcount" variable to 0, if a boot was successfully. +config BOOTCOUNT_PMIC_PFUZE100 + bool "Enable Bootcount driver for PMIC PFUZE100" + depends on DM_PMIC_PFUZE100 + help + Enable support for the bootcounter using PMIC PFUZE100 registers. + This works only, if the PMIC is not connected. + config BOOTCOUNT_RAM bool "Boot counter in RAM" help diff --git a/drivers/bootcount/Makefile b/drivers/bootcount/Makefile index 3a784bb0a6..d167815b3c 100644 --- a/drivers/bootcount/Makefile +++ b/drivers/bootcount/Makefile @@ -9,6 +9,7 @@ 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-$(CONFIG_BOOTCOUNT_PMIC_PFUZE100) += bootcount_pmic_pfuze100.o obj-$(CONFIG_DM_BOOTCOUNT) += bootcount-uclass.o obj-$(CONFIG_DM_BOOTCOUNT_RTC) += rtc.o diff --git a/drivers/bootcount/bootcount_pmic_pfuze100.c b/drivers/bootcount/bootcount_pmic_pfuze100.c new file mode 100644 index 0000000000..d732618218 --- /dev/null +++ b/drivers/bootcount/bootcount_pmic_pfuze100.c @@ -0,0 +1,83 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2018 Denx Software Engineering GmbH + * Heiko Schocher <h...@denx.de> + * + * A bootcount driver using the registers MEMA - MEMD on the PFUZE100. + * This works only, if the PMIC is not connected. + */ + +#include <common.h> +#include <fdtdec.h> +#include <errno.h> +#include <dm.h> +#include <i2c.h> +#include <power/pmic.h> +#include <power/regulator.h> +#include <power/pfuze100_pmic.h> + +DECLARE_GLOBAL_DATA_PTR; + +#define PFUZE_BC_MAGIC 0xdead + +static ulong pfuze100_get_magic(struct udevice *dev) +{ + ulong magic; + + magic = pmic_reg_read(dev, PFUZE100_MEMA); + magic += pmic_reg_read(dev, PFUZE100_MEMB) << 8; + return magic; +} + +static void pfuze100_set_magic(struct udevice *dev) +{ + pmic_reg_write(dev, PFUZE100_MEMA, PFUZE_BC_MAGIC & 0xff); + pmic_reg_write(dev, PFUZE100_MEMB, (PFUZE_BC_MAGIC >> 8) & 0xff); +} + +static ulong pfuze100_get_value(struct udevice *dev) +{ + ulong val; + + val = pmic_reg_read(dev, PFUZE100_MEMC); + val += pmic_reg_read(dev, PFUZE100_MEMD) << 8; + return val; +} + +static void pfuze100_set_val(struct udevice *dev, ulong val) +{ + pmic_reg_write(dev, PFUZE100_MEMC, val & 0xff); + pmic_reg_write(dev, PFUZE100_MEMD, (val >> 8) & 0xff); +} + +void bootcount_store(ulong a) +{ + struct udevice *dev; + int ret; + + ret = pmic_get("pfuze100@8", &dev); + if (ret != 0) + return; + + pfuze100_set_magic(dev); + pfuze100_set_val(dev, a); +} + +ulong bootcount_load(void) +{ + struct udevice *dev; + int ret; + ulong val; + ulong magic; + + ret = pmic_get("pfuze100@8", &dev); + if (ret != 0) + return 0; + + magic = pfuze100_get_magic(dev); + if (magic != PFUZE_BC_MAGIC) + return 0; + + val = pfuze100_get_value(dev); + return val; +} -- 2.34.1