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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 <asm/gpio.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 {
u8 die_id;
u8 die_rev;
u32 vsel_min;
u32 vsel_step;
} ic_types[] = {
{ 0x0, 0x3, 600000, 10000 }, /* Option 00 */
{ 0x0, 0xf, 800000, 10000 }, /* Option 13 */
{ 0x0, 0xc, 600000, 12500 }, /* Option 23 */
{ 0x1, 0x3, 600000, 10000 }, /* Option 01 */
{ 0x3, 0x3, 600000, 10000 }, /* Option 03 */
{ 0x4, 0xf, 603000, 12826 }, /* Option 04 */
{ 0x5, 0x3, 600000, 10000 }, /* Option 05 */
{ 0x8, 0x1, 600000, 10000 }, /* Option 08 */
{ 0x8, 0xf, 600000, 10000 }, /* Option 08 */
{ 0xc, 0xf, 603000, 12826 }, /* Option 09 */
};
/* 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_platdata {
/* 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_ofdata_to_platdata(struct udevice *dev)
{
struct fan53555_platdata *dev_pdata = dev_get_platdata(dev);
struct dm_regulator_uclass_platdata *uc_pdata =
dev_get_uclass_platdata(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_platdata *pdata = dev_get_platdata(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_platdata *pdata = dev_get_platdata(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, 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].die_id != priv->die_id)
continue;
if (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 = bitfield_extract(ID1, 5, 3);
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,
.ofdata_to_platdata = fan53555_regulator_ofdata_to_platdata,
.platdata_auto_alloc_size = sizeof(struct fan53555_platdata),
.priv_auto_alloc_size = sizeof(struct fan53555_priv),
.probe = fan53555_probe,
};
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