diff options
| -rw-r--r-- | drivers/bootcount/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/bootcount/Makefile | 1 | ||||
| -rw-r--r-- | drivers/bootcount/bootcount_dm_i2c.c | 102 |
3 files changed, 113 insertions, 0 deletions
diff --git a/drivers/bootcount/Kconfig b/drivers/bootcount/Kconfig index 7a2548ace2..3c56253b1e 100644 --- a/drivers/bootcount/Kconfig +++ b/drivers/bootcount/Kconfig @@ -109,6 +109,16 @@ config DM_BOOTCOUNT_RTC Accesses to the backing store are performed using the write16 and read16 ops of DM RTC devices. +config DM_BOOTCOUNT_I2C + bool "Driver Model boot counter on I2C device" + depends on DM_I2C + help + Enable support for the bootcounter on a generic i2c device, like a RTC + or PMIC. The bootcounter is configured in the device tree using the + "u-boot,bootcount-i2c" compatible string. It requires a phandle + 'i2cbcdev' for the i2c device and an 'offset' property used within the + device. + config DM_BOOTCOUNT_I2C_EEPROM bool "Support i2c eeprom devices as a backing store for bootcount" depends on I2C_EEPROM diff --git a/drivers/bootcount/Makefile b/drivers/bootcount/Makefile index d6d2389c16..e7771f5b36 100644 --- a/drivers/bootcount/Makefile +++ b/drivers/bootcount/Makefile @@ -13,5 +13,6 @@ obj-$(CONFIG_DM_BOOTCOUNT) += bootcount-uclass.o obj-$(CONFIG_DM_BOOTCOUNT_PMIC_PFUZE100) += pmic_pfuze100.o obj-$(CONFIG_DM_BOOTCOUNT_RTC) += rtc.o obj-$(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 diff --git a/drivers/bootcount/bootcount_dm_i2c.c b/drivers/bootcount/bootcount_dm_i2c.c new file mode 100644 index 0000000000..e27034cbeb --- /dev/null +++ b/drivers/bootcount/bootcount_dm_i2c.c @@ -0,0 +1,102 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2023 + * Philip Richard Oberfichtner <pro@denx.de> + * + * Based on previous work from Heiko Schocher (legacy bootcount_i2c.c driver) + */ + +#include <bootcount.h> +#include <dm.h> +#include <i2c.h> + +#define BC_MAGIC 0x55 + +struct bootcount_i2c_priv { + struct udevice *bcdev; + unsigned int offset; +}; + +static int bootcount_i2c_set(struct udevice *dev, const u32 val) +{ + int ret; + struct bootcount_i2c_priv *priv = dev_get_priv(dev); + + ret = dm_i2c_reg_write(priv->bcdev, priv->offset, BC_MAGIC); + if (ret < 0) + goto err_exit; + + ret = dm_i2c_reg_write(priv->bcdev, priv->offset + 1, val & 0xff); + if (ret < 0) + goto err_exit; + + return 0; + +err_exit: + log_debug("%s: Error writing to I2C device (%d)\n", __func__, ret); + return ret; +} + +static int bootcount_i2c_get(struct udevice *dev, u32 *val) +{ + int ret; + struct bootcount_i2c_priv *priv = dev_get_priv(dev); + + ret = dm_i2c_reg_read(priv->bcdev, priv->offset); + if (ret < 0) + goto err_exit; + + if ((ret & 0xff) != BC_MAGIC) { + log_debug("%s: Invalid Magic, reset bootcounter.\n", __func__); + *val = 0; + return bootcount_i2c_set(dev, 0); + } + + ret = dm_i2c_reg_read(priv->bcdev, priv->offset + 1); + if (ret < 0) + goto err_exit; + + *val = ret; + return 0; + +err_exit: + log_debug("%s: Error reading from I2C device (%d)\n", __func__, ret); + return ret; +} + +static int bootcount_i2c_probe(struct udevice *dev) +{ + struct bootcount_i2c_priv *priv = dev_get_priv(dev); + int ret; + + ret = dev_read_u32(dev, "offset", &priv->offset); + if (ret) + goto exit; + + ret = i2c_get_chip_by_phandle(dev, "i2cbcdev", &priv->bcdev); + +exit: + if (ret) + log_debug("%s failed, ret = %d\n", __func__, ret); + + return ret; +} + +static const struct bootcount_ops bootcount_i2c_ops = { + .get = bootcount_i2c_get, + .set = bootcount_i2c_set, +}; + +static const struct udevice_id bootcount_i2c_ids[] = { + { .compatible = "u-boot,bootcount-i2c" }, + { } +}; + +U_BOOT_DRIVER(bootcount_i2c) = { + .name = "bootcount-i2c", + .id = UCLASS_BOOTCOUNT, + .priv_auto = sizeof(struct bootcount_i2c_priv), + .probe = bootcount_i2c_probe, + .of_match = bootcount_i2c_ids, + .ops = &bootcount_i2c_ops, +}; |