--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
+/*
+ * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+
+#define STM32MP_PWR_CR3 0xc
+#define STM32MP_PWR_CR3_USB33DEN BIT(24)
+#define STM32MP_PWR_CR3_USB33RDY BIT(26)
+#define STM32MP_PWR_CR3_REG18DEN BIT(28)
+#define STM32MP_PWR_CR3_REG18RDY BIT(29)
+#define STM32MP_PWR_CR3_REG11DEN BIT(30)
+#define STM32MP_PWR_CR3_REG11RDY BIT(31)
+
+struct stm32mp_pwr_reg_info {
+ u32 enable;
+ u32 ready;
+ char *name;
+};
+
+struct stm32mp_pwr_priv {
+ struct regmap *regmap;
+};
+
+static int stm32mp_pwr_write(struct udevice *dev, uint reg,
+ const uint8_t *buff, int len)
+{
+ struct stm32mp_pwr_priv *priv = dev_get_priv(dev);
+ u32 val = *(u32 *)buff;
+
+ if (len != 4)
+ return -EINVAL;
+
+ return regmap_write(priv->regmap, STM32MP_PWR_CR3, val);
+}
+
+static int stm32mp_pwr_read(struct udevice *dev, uint reg, uint8_t *buff,
+ int len)
+{
+ struct stm32mp_pwr_priv *priv = dev_get_priv(dev);
+
+ if (len != 4)
+ return -EINVAL;
+
+ return regmap_read(priv->regmap, STM32MP_PWR_CR3, (u32 *)buff);
+}
+
+static int stm32mp_pwr_ofdata_to_platdata(struct udevice *dev)
+{
+ struct stm32mp_pwr_priv *priv = dev_get_priv(dev);
+ struct regmap *regmap;
+
+ regmap = syscon_get_regmap_by_driver_data(STM32MP_SYSCON_PWR);
+ if (IS_ERR(regmap)) {
+ pr_err("%s: unable to find regmap (%ld)\n", __func__,
+ PTR_ERR(regmap));
+ return PTR_ERR(regmap);
+ }
+ priv->regmap = regmap;
+
+ return 0;
+}
+
+static const struct pmic_child_info pwr_children_info[] = {
+ { .prefix = "reg", .driver = "stm32mp_pwr_regulator"},
+ { .prefix = "usb", .driver = "stm32mp_pwr_regulator"},
+ { },
+};
+
+static int stm32mp_pwr_bind(struct udevice *dev)
+{
+ int children;
+
+ children = pmic_bind_children(dev, dev->node, pwr_children_info);
+ if (!children)
+ dev_dbg(dev, "no child found\n");
+
+ return 0;
+}
+
+static struct dm_pmic_ops stm32mp_pwr_ops = {
+ .read = stm32mp_pwr_read,
+ .write = stm32mp_pwr_write,
+};
+
+static const struct udevice_id stm32mp_pwr_ids[] = {
+ { .compatible = "st,stm32mp1,pwr-reg" },
+ { }
+};
+
+U_BOOT_DRIVER(stm32mp_pwr_pmic) = {
+ .name = "stm32mp_pwr_pmic",
+ .id = UCLASS_PMIC,
+ .of_match = stm32mp_pwr_ids,
+ .bind = stm32mp_pwr_bind,
+ .ops = &stm32mp_pwr_ops,
+ .ofdata_to_platdata = stm32mp_pwr_ofdata_to_platdata,
+ .priv_auto_alloc_size = sizeof(struct stm32mp_pwr_priv),
+};
+
+static const struct stm32mp_pwr_reg_info stm32mp_pwr_reg11 = {
+ .enable = STM32MP_PWR_CR3_REG11DEN,
+ .ready = STM32MP_PWR_CR3_REG11RDY,
+ .name = "reg11"
+};
+
+static const struct stm32mp_pwr_reg_info stm32mp_pwr_reg18 = {
+ .enable = STM32MP_PWR_CR3_REG18DEN,
+ .ready = STM32MP_PWR_CR3_REG18RDY,
+ .name = "reg18"
+};
+
+static const struct stm32mp_pwr_reg_info stm32mp_pwr_usb33 = {
+ .enable = STM32MP_PWR_CR3_USB33DEN,
+ .ready = STM32MP_PWR_CR3_USB33RDY,
+ .name = "usb33"
+};
+
+static const struct stm32mp_pwr_reg_info *stm32mp_pwr_reg_infos[] = {
+ &stm32mp_pwr_reg11,
+ &stm32mp_pwr_reg18,
+ &stm32mp_pwr_usb33,
+ NULL
+};
+
+static int stm32mp_pwr_regulator_probe(struct udevice *dev)
+{
+ const struct stm32mp_pwr_reg_info **p = stm32mp_pwr_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) {
+ dev_dbg(dev, "found regulator %s\n", (*p)->name);
+ break;
+ } else if (rc != -ENODATA) {
+ return rc;
+ }
+ p++;
+ }
+ if (!*p) {
+ int i = 0;
+ const char *s;
+
+ dev_dbg(dev, "regulator ");
+ while (dev_read_string_index(dev, "regulator-name",
+ i++, &s) >= 0)
+ dev_dbg(dev, "%s'%s' ", (i > 1) ? ", " : "", s);
+ dev_dbg(dev, "%s not supported\n", (i > 2) ? "are" : "is");
+ return -EINVAL;
+ }
+
+ uc_pdata->type = REGULATOR_TYPE_FIXED;
+ dev->priv = (void *)*p;
+
+ return 0;
+}
+
+static int stm32mp_pwr_regulator_set_value(struct udevice *dev, int uV)
+{
+ struct dm_regulator_uclass_platdata *uc_pdata;
+
+ uc_pdata = dev_get_uclass_platdata(dev);
+ if (!uc_pdata)
+ return -ENXIO;
+
+ if (uc_pdata->min_uV != uV) {
+ dev_dbg(dev, "Invalid uV=%d for: %s\n", uV, uc_pdata->name);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int stm32mp_pwr_regulator_get_value(struct udevice *dev)
+{
+ struct dm_regulator_uclass_platdata *uc_pdata;
+
+ uc_pdata = dev_get_uclass_platdata(dev);
+ if (!uc_pdata)
+ return -ENXIO;
+
+ if (uc_pdata->min_uV != uc_pdata->max_uV) {
+ dev_dbg(dev, "Invalid constraints for: %s\n", uc_pdata->name);
+ return -EINVAL;
+ }
+
+ return uc_pdata->min_uV;
+}
+
+static int stm32mp_pwr_regulator_get_enable(struct udevice *dev)
+{
+ const struct stm32mp_pwr_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;
+
+ dev_dbg(dev, "%s id %s\n", p->name, (reg & p->enable) ? "on" : "off");
+
+ return (reg & p->enable) != 0;
+}
+
+static int stm32mp_pwr_regulator_set_enable(struct udevice *dev, bool enable)
+{
+ const struct stm32mp_pwr_reg_info *p = dev_get_priv(dev);
+ int rc;
+ u32 reg;
+ u32 time_start;
+
+ dev_dbg(dev, "Turning %s %s\n", enable ? "on" : "off", p->name);
+
+ rc = pmic_read(dev->parent, 0, (uint8_t *)®, sizeof(reg));
+ if (rc)
+ return rc;
+
+ /* if regulator is already in the wanted state, nothing to do */
+ if (!!(reg & p->enable) == enable)
+ return 0;
+
+ reg &= ~p->enable;
+ if (enable)
+ reg |= p->enable;
+
+ rc = pmic_write(dev->parent, 0, (uint8_t *)®, sizeof(reg));
+ if (rc)
+ return rc;
+
+ if (!enable)
+ return 0;
+
+ /* waiting ready for enable */
+ time_start = get_timer(0);
+ while (1) {
+ rc = pmic_read(dev->parent, 0, (uint8_t *)®, sizeof(reg));
+ if (rc)
+ return rc;
+ if (reg & p->ready)
+ break;
+ if (get_timer(time_start) > CONFIG_SYS_HZ) {
+ dev_dbg(dev, "%s: timeout\n", p->name);
+ return -ETIMEDOUT;
+ }
+ }
+ return 0;
+}
+
+static const struct dm_regulator_ops stm32mp_pwr_regulator_ops = {
+ .set_value = stm32mp_pwr_regulator_set_value,
+ .get_value = stm32mp_pwr_regulator_get_value,
+ .get_enable = stm32mp_pwr_regulator_get_enable,
+ .set_enable = stm32mp_pwr_regulator_set_enable,
+};
+
+U_BOOT_DRIVER(stm32mp_pwr_regulator) = {
+ .name = "stm32mp_pwr_regulator",
+ .id = UCLASS_REGULATOR,
+ .ops = &stm32mp_pwr_regulator_ops,
+ .probe = stm32mp_pwr_regulator_probe,
+};
projects / oweals / u-boot.git / commitdiff