diff options
Diffstat (limited to 'roms/u-boot/drivers/power/regulator/fan53555.c')
| -rw-r--r-- | roms/u-boot/drivers/power/regulator/fan53555.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/power/regulator/fan53555.c b/roms/u-boot/drivers/power/regulator/fan53555.c new file mode 100644 index 000000000..9d8a235b7 --- /dev/null +++ b/roms/u-boot/drivers/power/regulator/fan53555.c @@ -0,0 +1,245 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) 2018 Theobroma Systems Design und Consulting GmbH + */ + +#include <common.h> +#include <bitfield.h> +#include <errno.h> +#include <dm.h> +#include <fdtdec.h> +#include <i2c.h> +#include <log.h> +#include <asm/gpio.h> +#include <linux/bitops.h> +#include <power/fan53555.h> +#include <power/pmic.h> +#include <power/regulator.h> + +/** + * struct ic_types - definition of fan53555-family devices + * + * @die_id: Identifies the DIE_ID (lower nibble of the ID1 register) + * @die_rev: Identifies the DIE_REV (lower nibble of the ID2 register) + * @vsel_min: starting voltage (step 0) in uV + * @vsel_step: increment of the voltage in uV + * + * The voltage ramp (i.e. minimum voltage and step) is selected from the + * combination of 2 nibbles: DIE_ID and DIE_REV. + * + * See http://www.onsemi.com/pub/Collateral/FAN53555-D.pdf for details. + */ +static const struct { + unsigned int vendor; + u8 die_id; + u8 die_rev; + bool check_rev; + u32 vsel_min; + u32 vsel_step; +} ic_types[] = { + /* Option 00 */ + { FAN53555_VENDOR_FAIRCHILD, 0x0, 0x3, true, 600000, 10000 }, + /* Option 13 */ + { FAN53555_VENDOR_FAIRCHILD, 0x0, 0xf, true, 800000, 10000 }, + /* Option 23 */ + { FAN53555_VENDOR_FAIRCHILD, 0x0, 0xc, true, 600000, 12500 }, + /* Option 01 */ + { FAN53555_VENDOR_FAIRCHILD, 0x1, 0x3, true, 600000, 10000 }, + /* Option 03 */ + { FAN53555_VENDOR_FAIRCHILD, 0x3, 0x3, true, 600000, 10000 }, + /* Option 04 */ + { FAN53555_VENDOR_FAIRCHILD, 0x4, 0xf, true, 603000, 12826 }, + /* Option 05 */ + { FAN53555_VENDOR_FAIRCHILD, 0x5, 0x3, true, 600000, 10000 }, + /* Option 08 */ + { FAN53555_VENDOR_FAIRCHILD, 0x8, 0x1, true, 600000, 10000 }, + /* Option 08 */ + { FAN53555_VENDOR_FAIRCHILD, 0x8, 0xf, true, 600000, 10000 }, + /* Option 09 */ + { FAN53555_VENDOR_FAIRCHILD, 0xc, 0xf, true, 603000, 12826 }, + /* SYL82X */ + { FAN53555_VENDOR_SILERGY, 0x8, 0x0, false, 712500, 12500 }, + /* SYL83X */ + { FAN53555_VENDOR_SILERGY, 0x9, 0x0, false, 712500, 12500 }, +}; + +/* I2C-accessible byte-sized registers */ +enum { + /* Voltage setting */ + FAN53555_VSEL0 = 0x00, + FAN53555_VSEL1, + /* Control register */ + FAN53555_CONTROL, + /* IC Type */ + FAN53555_ID1, + /* IC mask version */ + FAN53555_ID2, + /* Monitor register */ + FAN53555_MONITOR, +}; + +struct fan53555_plat { + /* Voltage setting register */ + unsigned int vol_reg; + unsigned int sleep_reg; + +}; + +struct fan53555_priv { + /* IC Vendor */ + unsigned int vendor; + /* IC Type and Rev */ + unsigned int die_id; + unsigned int die_rev; + /* Voltage range and step(linear) */ + unsigned int vsel_min; + unsigned int vsel_step; + /* Voltage slew rate limiting */ + unsigned int slew_rate; + /* Sleep voltage cache */ + unsigned int sleep_vol_cache; +}; + +static int fan53555_regulator_of_to_plat(struct udevice *dev) +{ + struct fan53555_plat *dev_pdata = dev_get_plat(dev); + struct dm_regulator_uclass_plat *uc_pdata = + dev_get_uclass_plat(dev); + u32 sleep_vsel; + + /* This is a buck regulator */ + uc_pdata->type = REGULATOR_TYPE_BUCK; + + sleep_vsel = dev_read_u32_default(dev, "fcs,suspend-voltage-selector", + FAN53555_VSEL1); + + /* + * Depending on the device-tree settings, the 'normal mode' + * voltage is either controlled by VSEL0 or VSEL1. + */ + switch (sleep_vsel) { + case FAN53555_VSEL0: + dev_pdata->sleep_reg = FAN53555_VSEL0; + dev_pdata->vol_reg = FAN53555_VSEL1; + break; + case FAN53555_VSEL1: + dev_pdata->sleep_reg = FAN53555_VSEL1; + dev_pdata->vol_reg = FAN53555_VSEL0; + break; + default: + pr_err("%s: invalid vsel id %d\n", dev->name, sleep_vsel); + return -EINVAL; + } + + return 0; +} + +static int fan53555_regulator_get_value(struct udevice *dev) +{ + struct fan53555_plat *pdata = dev_get_plat(dev); + struct fan53555_priv *priv = dev_get_priv(dev); + int reg; + int voltage; + + /* We only support a single voltage selector (i.e. 'normal' mode). */ + reg = pmic_reg_read(dev->parent, pdata->vol_reg); + if (reg < 0) + return reg; + voltage = priv->vsel_min + (reg & 0x3f) * priv->vsel_step; + + debug("%s: %d uV\n", __func__, voltage); + return voltage; +} + +static int fan53555_regulator_set_value(struct udevice *dev, int uV) +{ + struct fan53555_plat *pdata = dev_get_plat(dev); + struct fan53555_priv *priv = dev_get_priv(dev); + u8 vol; + + vol = (uV - priv->vsel_min) / priv->vsel_step; + debug("%s: uV=%d; writing volume %d: %02x\n", + __func__, uV, pdata->vol_reg, vol); + + return pmic_clrsetbits(dev->parent, pdata->vol_reg, GENMASK(6, 0), vol); +} + +static int fan53555_voltages_setup(struct udevice *dev) +{ + struct fan53555_priv *priv = dev_get_priv(dev); + int i; + + /* Init voltage range and step */ + for (i = 0; i < ARRAY_SIZE(ic_types); ++i) { + if (ic_types[i].vendor != priv->vendor) + continue; + + if (ic_types[i].die_id != priv->die_id) + continue; + + if (ic_types[i].check_rev && + ic_types[i].die_rev != priv->die_rev) + continue; + + priv->vsel_min = ic_types[i].vsel_min; + priv->vsel_step = ic_types[i].vsel_step; + + return 0; + } + + pr_err("%s: %s: die id %d rev %d not supported!\n", + dev->name, __func__, priv->die_id, priv->die_rev); + return -EINVAL; +} + +enum { + DIE_ID_SHIFT = 0, + DIE_ID_WIDTH = 4, + DIE_REV_SHIFT = 0, + DIE_REV_WIDTH = 4, +}; + +static int fan53555_probe(struct udevice *dev) +{ + struct fan53555_priv *priv = dev_get_priv(dev); + int ID1, ID2; + + debug("%s\n", __func__); + + /* read chip ID1 and ID2 (two registers, starting at ID1) */ + ID1 = pmic_reg_read(dev->parent, FAN53555_ID1); + if (ID1 < 0) + return ID1; + + ID2 = pmic_reg_read(dev->parent, FAN53555_ID2); + if (ID2 < 0) + return ID2; + + /* extract vendor, die_id and die_rev */ + priv->vendor = dev->driver_data; + priv->die_id = ID1 & GENMASK(3, 0); + priv->die_rev = ID2 & GENMASK(3, 0); + + if (fan53555_voltages_setup(dev) < 0) + return -ENODATA; + + debug("%s: FAN53555 option %d rev %d detected\n", + __func__, priv->die_id, priv->die_rev); + + return 0; +} + +static const struct dm_regulator_ops fan53555_regulator_ops = { + .get_value = fan53555_regulator_get_value, + .set_value = fan53555_regulator_set_value, +}; + +U_BOOT_DRIVER(fan53555_regulator) = { + .name = "fan53555_regulator", + .id = UCLASS_REGULATOR, + .ops = &fan53555_regulator_ops, + .of_to_plat = fan53555_regulator_of_to_plat, + .plat_auto = sizeof(struct fan53555_plat), + .priv_auto = sizeof(struct fan53555_priv), + .probe = fan53555_probe, +}; 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