// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com>
* Jean-Jacques Hiblot <jjhiblot@ti.com>
*/
#include <common.h>
#include <errno.h>
#include <dm.h>
#include <power/pmic.h>
#include <power/regulator.h>
#include <regmap.h>
#include <syscon.h>
#include <linux/bitops.h>
#include <linux/ioport.h>
#include <dm/read.h>
struct pbias_reg_info {
u32 enable;
u32 enable_mask;
u32 disable_val;
u32 vmode;
unsigned int enable_time;
char *name;
};
struct pbias_priv {
struct regmap *regmap;
int offset;
};
static const struct pmic_child_info pmic_children_info[] = {
{ .prefix = "pbias", .driver = "pbias_regulator"},
{ },
};
static int pbias_write(struct udevice *dev, uint reg, const uint8_t *buff,
int len)
{
struct pbias_priv *priv = dev_get_priv(dev);
u32 val = *(u32 *)buff;
if (len != 4)
return -EINVAL;
return regmap_write(priv->regmap, priv->offset, val);
}
static int pbias_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
{
struct pbias_priv *priv = dev_get_priv(dev);
if (len != 4)
return -EINVAL;
return regmap_read(priv->regmap, priv->offset, (u32 *)buff);
}
static int pbias_ofdata_to_platdata(struct udevice *dev)
{
struct pbias_priv *priv = dev_get_priv(dev);
struct udevice *syscon;
struct regmap *regmap;
struct resource res;
int err;
err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
"syscon", &syscon);
if (err) {
pr_err("%s: unable to find syscon device (%d)\n", __func__,
err);
return err;
}
regmap = syscon_get_regmap(syscon);
if (IS_ERR(regmap)) {
pr_err("%s: unable to find regmap (%ld)\n", __func__,
PTR_ERR(regmap));
return PTR_ERR(regmap);
}
priv->regmap = regmap;
err = dev_read_resource(dev, 0, &res);
if (err) {
pr_err("%s: unable to find offset (%d)\n", __func__, err);
return err;
}
priv->offset = res.start;
return 0;
}
static int pbias_bind(struct udevice *dev)
{
int children;
children = pmic_bind_children(dev, dev->node, pmic_children_info);
if (!children)
debug("%s: %s - no child found\n", __func__, dev->name);
return 0;
}
static struct dm_pmic_ops pbias_ops = {
.read = pbias_read,
.write = pbias_write,
};
static const struct udevice_id pbias_ids[] = {
{ .compatible = "ti,pbias-dra7" },
{ }
};
U_BOOT_DRIVER(pbias_pmic) = {
.name = "pbias_pmic",
.id = UCLASS_PMIC,
.of_match = pbias_ids,
.bind = pbias_bind,
.ops = &pbias_ops,
.ofdata_to_platdata = pbias_ofdata_to_platdata,
.priv_auto_alloc_size = sizeof(struct pbias_priv),
};
static const struct pbias_reg_info pbias_mmc_omap2430 = {
.enable = BIT(1),
.enable_mask = BIT(1),
.vmode = BIT(0),
.disable_val = 0,
.enable_time = 100,
.name = "pbias_mmc_omap2430"
};
static const struct pbias_reg_info pbias_sim_omap3 = {
.enable = BIT(9),
.enable_mask = BIT(9),
.vmode = BIT(8),
.enable_time = 100,
.name = "pbias_sim_omap3"
};
static const struct pbias_reg_info pbias_mmc_omap4 = {
.enable = BIT(26) | BIT(22),
.enable_mask = BIT(26) | BIT(25) | BIT(22),
.disable_val = BIT(25),
.vmode = BIT(21),
.enable_time = 100,
.name = "pbias_mmc_omap4"
};
static const struct pbias_reg_info pbias_mmc_omap5 = {
.enable = BIT(27) | BIT(26),
.enable_mask = BIT(27) | BIT(25) | BIT(26),
.disable_val = BIT(25),
.vmode = BIT(21),
.enable_time = 100,
.name = "pbias_mmc_omap5"
};
static const struct pbias_reg_info *pbias_reg_infos[] = {
&pbias_mmc_omap5,
&pbias_mmc_omap4,
&pbias_sim_omap3,
&pbias_mmc_omap2430,
NULL
};
static int pbias_regulator_probe(struct udevice *dev)
{
const struct pbias_reg_info **p = pbias_reg_infos;
struct dm_regulator_uclass_platdata *uc_pdata;
uc_pdata = dev_get_uclass_platdata(dev);
while (*p) {
int rc;
rc = dev_read_stringlist_search(dev, "regulator-name",
(*p)->name);
if (rc >= 0) {
debug("found regulator %s\n", (*p)->name);
break;
} else if (rc != -ENODATA) {
return rc;
}
p++;
}
if (!*p) {
int i = 0;
const char *s;
debug("regulator ");
while (dev_read_string_index(dev, "regulator-name", i++, &s) >= 0)
debug("%s'%s' ", (i > 1) ? ", " : "", s);
debug("%s not supported\n", (i > 2) ? "are" : "is");
return -EINVAL;
}
uc_pdata->type = REGULATOR_TYPE_OTHER;
dev->priv = (void *)*p;
return 0;
}
static int pbias_regulator_get_value(struct udevice *dev)
{
const struct pbias_reg_info *p = dev_get_priv(dev);
int rc;
u32 reg;
rc = pmic_read(dev->parent, 0, (uint8_t *)®, sizeof(reg));
if (rc)
return rc;
debug("%s voltage id %s\n", p->name,
(reg & p->vmode) ? "3.0v" : "1.8v");
return (reg & p->vmode) ? 3000000 : 1800000;
}
static int pbias_regulator_set_value(struct udevice *dev, int uV)
{
const struct pbias_reg_info *p = dev_get_priv(dev);
int rc;
u32 reg;
rc = pmic_read(dev->parent, 0, (uint8_t *)®, sizeof(reg));
if (rc)
return rc;
if (uV == 3000000)
reg |= p->vmode;
else if (uV == 1800000)
reg &= ~p->vmode;
else
return -EINVAL;
debug("Setting %s voltage to %s\n", p->name,
(reg & p->vmode) ? "3.0v" : "1.8v");
return pmic_write(dev->parent, 0, (uint8_t *)®, sizeof(reg));
}
static int pbias_regulator_get_enable(struct udevice *dev)
{
const struct pbias_reg_info *p = dev_get_priv(dev);
int rc;
u32 reg;
rc = pmic_read(dev->parent, 0, (uint8_t *)®, sizeof(reg));
if (rc)
return rc;
debug("%s id %s\n", p->name,
(reg & p->enable_mask) == (p->disable_val) ? "on" : "off");
return (reg & p->enable_mask) == (p->disable_val);
}
static int pbias_regulator_set_enable(struct udevice *dev, bool enable)
{
const struct pbias_reg_info *p = dev_get_priv(dev);
int rc;
u32 reg;
debug("Turning %s %s\n", enable ? "on" : "off", p->name);
rc = pmic_read(dev->parent, 0, (uint8_t *)®, sizeof(reg));
if (rc)
return rc;
reg &= ~p->enable_mask;
if (enable)
reg |= p->enable;
else
reg |= p->disable_val;
rc = pmic_write(dev->parent, 0, (uint8_t *)®, sizeof(reg));
if (rc)
return rc;
if (enable)
udelay(p->enable_time);
return 0;
}
static const struct dm_regulator_ops pbias_regulator_ops = {
.get_value = pbias_regulator_get_value,
.set_value = pbias_regulator_set_value,
.get_enable = pbias_regulator_get_enable,
.set_enable = pbias_regulator_set_enable,
};
U_BOOT_DRIVER(pbias_regulator) = {
.name = "pbias_regulator",
.id = UCLASS_REGULATOR,
.ops = &pbias_regulator_ops,
.probe = pbias_regulator_probe,
};