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// SPDX-License-Identifier: GPL-2.0-only
/*
* Rockchip IO Voltage Domain driver
*
* Copyright 2014 MundoReader S.L.
* Copyright 2014 Google, Inc.
*/
#include <common.h>
#include <driver.h>
#include <errno.h>
#include <init.h>
#include <io.h>
#include <of.h>
#include <linux/err.h>
#include <mfd/syscon.h>
#include <linux/regmap.h>
#include <regulator.h>
#define MAX_SUPPLIES 16
/*
* The max voltage for 1.8V and 3.3V come from the Rockchip datasheet under
* "Recommended Operating Conditions" for "Digital GPIO". When the typical
* is 3.3V the max is 3.6V. When the typical is 1.8V the max is 1.98V.
*
* They are used like this:
* - If the voltage on a rail is above the "1.8" voltage (1.98V) we'll tell the
* SoC we're at 3.3.
* - If the voltage on a rail is above the "3.3" voltage (3.6V) we'll consider
* that to be an error.
*/
#define MAX_VOLTAGE_1_8 1980000
#define MAX_VOLTAGE_3_3 3600000
#define RK3568_PMU_GRF_IO_VSEL0 (0x0140)
#define RK3568_PMU_GRF_IO_VSEL1 (0x0144)
#define RK3568_PMU_GRF_IO_VSEL2 (0x0148)
struct rockchip_iodomain;
struct rockchip_iodomain_supply {
struct rockchip_iodomain *iod;
struct regulator *reg;
int idx;
};
struct rockchip_iodomain_soc_data {
int grf_offset;
const char *supply_names[MAX_SUPPLIES];
void (*init)(struct rockchip_iodomain *iod);
int (*write)(struct rockchip_iodomain_supply *supply, int uV);
};
struct rockchip_iodomain {
struct device *dev;
struct regmap *grf;
const struct rockchip_iodomain_soc_data *soc_data;
struct rockchip_iodomain_supply supplies[MAX_SUPPLIES];
int (*write)(struct rockchip_iodomain_supply *supply, int uV);
};
static int rk3568_iodomain_write(struct rockchip_iodomain_supply *supply,
int uV)
{
struct rockchip_iodomain *iod = supply->iod;
u32 is_3v3 = uV > MAX_VOLTAGE_1_8;
u32 val0, val1;
int b;
dev_dbg(iod->dev, "set domain %d to %d uV\n", supply->idx, uV);
switch (supply->idx) {
case 0: /* pmuio1 */
break;
case 1: /* pmuio2 */
b = supply->idx;
val0 = BIT(16 + b) | (is_3v3 ? 0 : BIT(b));
b = supply->idx + 4;
val1 = BIT(16 + b) | (is_3v3 ? BIT(b) : 0);
regmap_write(iod->grf, RK3568_PMU_GRF_IO_VSEL2, val0);
regmap_write(iod->grf, RK3568_PMU_GRF_IO_VSEL2, val1);
break;
case 3: /* vccio2 */
break;
case 2: /* vccio1 */
case 4: /* vccio3 */
case 5: /* vccio4 */
case 6: /* vccio5 */
case 7: /* vccio6 */
case 8: /* vccio7 */
b = supply->idx - 1;
val0 = BIT(16 + b) | (is_3v3 ? 0 : BIT(b));
val1 = BIT(16 + b) | (is_3v3 ? BIT(b) : 0);
regmap_write(iod->grf, RK3568_PMU_GRF_IO_VSEL0, val0);
regmap_write(iod->grf, RK3568_PMU_GRF_IO_VSEL1, val1);
break;
default:
return -EINVAL;
}
return 0;
}
static const struct rockchip_iodomain_soc_data soc_data_rk3568_pmu = {
.grf_offset = 0x140,
.supply_names = {
"pmuio1",
"pmuio2",
"vccio1",
"vccio2",
"vccio3",
"vccio4",
"vccio5",
"vccio6",
"vccio7",
},
.write = rk3568_iodomain_write,
};
static const struct of_device_id rockchip_iodomain_match[] = {
{ .compatible = "rockchip,rk3568-pmu-io-voltage-domain",
.data = &soc_data_rk3568_pmu },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, rockchip_iodomain_match);
static int rockchip_iodomain_probe(struct device *dev)
{
struct device_node *np = dev->of_node, *parent;
struct rockchip_iodomain *iod;
int i, ret = 0;
if (!np)
return -ENODEV;
iod = xzalloc(sizeof(*iod));
iod->dev = dev;
iod->soc_data = device_get_match_data(dev);
if (iod->soc_data->write)
iod->write = iod->soc_data->write;
parent = of_get_parent(np);
if (parent) {
iod->grf = syscon_node_to_regmap(parent);
} else {
dev_dbg(dev, "falling back to old binding\n");
iod->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
}
if (IS_ERR(iod->grf)) {
dev_err(dev, "couldn't find grf regmap\n");
return PTR_ERR(iod->grf);
}
for (i = 0; i < MAX_SUPPLIES; i++) {
const char *supply_name = iod->soc_data->supply_names[i];
struct rockchip_iodomain_supply *supply = &iod->supplies[i];
struct regulator *reg;
int uV;
if (!supply_name)
continue;
reg = regulator_get(dev, supply_name);
if (IS_ERR(reg)) {
ret = PTR_ERR(reg);
/* If a supply wasn't specified, that's OK */
if (ret == -ENODEV)
continue;
else if (ret != -EPROBE_DEFER)
dev_err(dev, "couldn't get regulator %s\n",
supply_name);
goto out;
}
/* set initial correct value */
uV = regulator_get_voltage(reg);
/* must be a regulator we can get the voltage of */
if (uV < 0) {
dev_err(dev, "Can't determine voltage: %s\n",
supply_name);
ret = uV;
goto out;
}
if (uV > MAX_VOLTAGE_3_3) {
dev_crit(dev, "%d uV is too high. May damage SoC!\n",
uV);
ret = -EINVAL;
goto out;
}
/* setup our supply */
supply->idx = i;
supply->iod = iod;
supply->reg = reg;
ret = iod->write(supply, uV);
if (ret) {
supply->reg = NULL;
goto out;
}
}
if (iod->soc_data->init)
iod->soc_data->init(iod);
ret = 0;
out:
return ret;
}
static struct driver rockchip_iodomain_driver = {
.name = "rockchip-iodomain",
.probe = rockchip_iodomain_probe,
.of_compatible = rockchip_iodomain_match,
};
coredevice_platform_driver(rockchip_iodomain_driver);
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