diff options
Diffstat (limited to 'drivers/bootcount/pmic_pfuze100.c')
-rw-r--r-- | drivers/bootcount/pmic_pfuze100.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/drivers/bootcount/pmic_pfuze100.c b/drivers/bootcount/pmic_pfuze100.c new file mode 100644 index 0000000..ad3bc03 --- /dev/null +++ b/drivers/bootcount/pmic_pfuze100.c @@ -0,0 +1,161 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2018-2022 Denx Software Engineering GmbH + * Heiko Schocher <hs@denx.de> + * Philip Oberfichtner <pro@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 <bootcount.h> +#include <dm.h> +#include <power/pmic.h> +#include <power/pfuze100_pmic.h> + +DECLARE_GLOBAL_DATA_PTR; + +#define PFUZE_BC_MAGIC 0xdead + +struct bootcount_pmic_priv { + struct udevice *pmic; +}; + +static int pfuze100_get_magic(struct udevice *dev, u32 *magic) +{ + int ret; + + ret = pmic_reg_read(dev, PFUZE100_MEMA); + if (ret < 0) + return ret; + *magic = ret; + + ret = pmic_reg_read(dev, PFUZE100_MEMB); + if (ret < 0) + return ret; + *magic += ret << 8; + + return 0; +} + +static int pfuze100_set_magic(struct udevice *dev) +{ + int ret; + + ret = pmic_reg_write(dev, PFUZE100_MEMA, PFUZE_BC_MAGIC & 0xff); + if (ret) + return ret; + + ret = pmic_reg_write(dev, PFUZE100_MEMB, (PFUZE_BC_MAGIC >> 8) & 0xff); + return ret; +} + +static int pfuze100_get_value(struct udevice *dev, u32 *a) +{ + int ret; + + ret = pmic_reg_read(dev, PFUZE100_MEMC); + if (ret < 0) + return ret; + *a = ret; + + ret = pmic_reg_read(dev, PFUZE100_MEMD); + if (ret < 0) + return ret; + *a += ret << 8; + + return 0; +} + +static int pfuze100_set_value(struct udevice *dev, u32 val) +{ + int ret; + + ret = pmic_reg_write(dev, PFUZE100_MEMC, val & 0xff); + if (ret) + return ret; + + ret = pmic_reg_write(dev, PFUZE100_MEMD, (val >> 8) & 0xff); + return ret; +} + +static int bootcount_pmic_set(struct udevice *dev, const u32 a) +{ + struct bootcount_pmic_priv *priv = dev_get_priv(dev); + + if (pfuze100_set_magic(priv->pmic)) { + debug("%s: writing magic failed\n", __func__); + return -EIO; + } + + if (pfuze100_set_value(priv->pmic, a)) { + debug("%s: writing value failed\n", __func__); + return -EIO; + } + + return 0; +} + +static int bootcount_pmic_get(struct udevice *dev, u32 *a) +{ + struct bootcount_pmic_priv *priv = dev_get_priv(dev); + u32 magic; + + if (pfuze100_get_magic(priv->pmic, &magic)) { + debug("%s: reading magic failed\n", __func__); + return -EIO; + } + + if (magic != PFUZE_BC_MAGIC) { + *a = 0; + return 0; + } + + if (pfuze100_get_value(priv->pmic, a)) { + debug("%s: reading value failed\n", __func__); + return -EIO; + } + + return 0; +} + +static int bootcount_pmic_probe(struct udevice *dev) +{ + struct ofnode_phandle_args phandle_args; + struct bootcount_pmic_priv *priv = dev_get_priv(dev); + struct udevice *pmic; + + if (dev_read_phandle_with_args(dev, "pmic", NULL, 0, 0, &phandle_args)) { + debug("%s: pmic backing device not specified\n", dev->name); + return -ENOENT; + } + + if (uclass_get_device_by_ofnode(UCLASS_PMIC, phandle_args.node, &pmic)) { + debug("%s: could not get backing device\n", dev->name); + return -ENODEV; + } + + priv->pmic = pmic; + + return 0; +} + +static const struct bootcount_ops bootcount_pmic_ops = { + .get = bootcount_pmic_get, + .set = bootcount_pmic_set, +}; + +static const struct udevice_id bootcount_pmic_ids[] = { + { .compatible = "u-boot,bootcount-pmic" }, + { } +}; + +U_BOOT_DRIVER(bootcount_pmic) = { + .name = "bootcount-pmic", + .id = UCLASS_BOOTCOUNT, + .priv_auto = sizeof(struct bootcount_pmic_priv), + .probe = bootcount_pmic_probe, + .of_match = bootcount_pmic_ids, + .ops = &bootcount_pmic_ops, +}; |