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- // 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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