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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2019 NXP
*/
#include <fdtdec.h>
#include <errno.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <dm/lists.h>
#include <i2c.h>
#include <log.h>
#include <asm/global_data.h>
#include <linux/delay.h>
#include <linux/printk.h>
#include <power/pmic.h>
#include <power/regulator.h>
#include <power/pca9450.h>
#include <sysreset.h>
DECLARE_GLOBAL_DATA_PTR;
static const struct pmic_child_info pmic_children_info[] = {
/* buck */
{ .prefix = "b", .driver = PCA9450_REGULATOR_DRIVER},
{ .prefix = "B", .driver = PCA9450_REGULATOR_DRIVER},
/* ldo */
{ .prefix = "l", .driver = PCA9450_REGULATOR_DRIVER},
{ .prefix = "L", .driver = PCA9450_REGULATOR_DRIVER},
{ },
};
static int pca9450_reg_count(struct udevice *dev)
{
return PCA9450_REG_NUM;
}
static int pca9450_write(struct udevice *dev, uint reg, const uint8_t *buff,
int len)
{
if (dm_i2c_write(dev, reg, buff, len)) {
pr_err("write error to device: %p register: %#x!\n", dev, reg);
return -EIO;
}
return 0;
}
static int pca9450_read(struct udevice *dev, uint reg, uint8_t *buff,
int len)
{
if (dm_i2c_read(dev, reg, buff, len)) {
pr_err("read error from device: %p register: %#x!\n", dev, reg);
return -EIO;
}
return 0;
}
static int pca9450_bind(struct udevice *dev)
{
int children;
ofnode regulators_node;
regulators_node = dev_read_subnode(dev, "regulators");
if (!ofnode_valid(regulators_node)) {
debug("%s: %s regulators subnode not found!", __func__,
dev->name);
return -ENXIO;
}
debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
children = pmic_bind_children(dev, regulators_node,
pmic_children_info);
if (!children)
debug("%s: %s - no child found\n", __func__, dev->name);
/* Always return success for this device */
return 0;
}
static int pca9450_probe(struct udevice *dev)
{
unsigned int reset_ctrl;
int ret;
if (CONFIG_IS_ENABLED(SYSRESET)) {
ret = device_bind_driver_to_node(dev, "pca9450_sysreset",
"pca9450_sysreset",
dev_ofnode(dev), NULL);
if (ret)
return ret;
}
if (ofnode_read_bool(dev_ofnode(dev), "nxp,wdog_b-warm-reset"))
reset_ctrl = PCA9450_PMIC_RESET_WDOG_B_CFG_WARM;
else
reset_ctrl = PCA9450_PMIC_RESET_WDOG_B_CFG_COLD_LDO12;
return pmic_clrsetbits(dev, PCA9450_RESET_CTRL,
PCA9450_PMIC_RESET_WDOG_B_CFG_MASK, reset_ctrl);
}
static struct dm_pmic_ops pca9450_ops = {
.reg_count = pca9450_reg_count,
.read = pca9450_read,
.write = pca9450_write,
};
static const struct udevice_id pca9450_ids[] = {
{ .compatible = "nxp,pca9450a", .data = NXP_CHIP_TYPE_PCA9450A, },
{ .compatible = "nxp,pca9450b", .data = NXP_CHIP_TYPE_PCA9450BC, },
{ .compatible = "nxp,pca9450c", .data = NXP_CHIP_TYPE_PCA9450BC, },
{ .compatible = "nxp,pca9451a", .data = NXP_CHIP_TYPE_PCA9451A, },
{ .compatible = "nxp,pca9452", .data = NXP_CHIP_TYPE_PCA9452, },
{ }
};
U_BOOT_DRIVER(pmic_pca9450) = {
.name = "pca9450 pmic",
.id = UCLASS_PMIC,
.of_match = pca9450_ids,
.bind = pca9450_bind,
.probe = pca9450_probe,
.ops = &pca9450_ops,
};
#ifdef CONFIG_SYSRESET
static int pca9450_sysreset_request(struct udevice *dev, enum sysreset_t type)
{
u8 cmd = PCA9450_SW_RST_COLD_RST;
if (type != SYSRESET_COLD)
return -EPROTONOSUPPORT;
if (pmic_write(dev->parent, PCA9450_SW_RST, &cmd, 1)) {
dev_err(dev, "reset command failed\n");
} else {
/* tRESTART is 250ms, delay 300ms just to be sure */
mdelay(300);
/* Should not get here, warn if we do */
dev_warn(dev, "didn't respond to reset command\n");
}
return -EINPROGRESS;
}
int pca9450_sysreset_get_status(struct udevice *dev, char *buf, int size)
{
const char *reason;
int ret;
u8 reg;
ret = pmic_read(dev->parent, PCA9450_PWRON_STAT, ®, 1);
if (ret)
return ret;
switch (reg) {
case PCA9450_PWRON_STAT_PWRON_MASK:
reason = "PWRON";
break;
case PCA9450_PWRON_STAT_WDOG_MASK:
reason = "WDOGB";
break;
case PCA9450_PWRON_STAT_SW_RST_MASK:
reason = "SW_RST";
break;
case PCA9450_PWRON_STAT_PMIC_RST_MASK:
reason = "PMIC_RST";
break;
default:
reason = "UNKNOWN";
break;
}
ret = snprintf(buf, size, "Reset Status: %s\n", reason);
if (ret < 0) {
dev_err(dev, "Write reset status error (err = %d)\n", ret);
return -EIO;
}
return 0;
}
static struct sysreset_ops pca9450_sysreset_ops = {
.request = pca9450_sysreset_request,
.get_status = pca9450_sysreset_get_status,
};
U_BOOT_DRIVER(pca9450_sysreset) = {
.name = "pca9450_sysreset",
.id = UCLASS_SYSRESET,
.ops = &pca9450_sysreset_ops,
};
#endif /* CONFIG_SYSRESET */
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