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- // 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 <log.h>
- #include <linux/delay.h>
- #include <linux/err.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/device-internal.h>
- #include <dm/read.h>
- #ifdef CONFIG_MMC_OMAP36XX_PINS
- #include <asm/arch/sys_proto.h>
- #include <asm/io.h>
- #include <asm/arch/mux.h>
- #endif
- 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_of_to_plat(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_ofnode(dev),
- 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" },
- { .compatible = "ti,pbias-omap2" },
- { .compatible = "ti,pbias-omap3" },
- { .compatible = "ti,pbias-omap4" },
- { .compatible = "ti,pbias-omap5" },
- { }
- };
- U_BOOT_DRIVER(pbias_pmic) = {
- .name = "pbias_pmic",
- .id = UCLASS_PMIC,
- .of_match = pbias_ids,
- .bind = pbias_bind,
- .ops = &pbias_ops,
- .of_to_plat = pbias_of_to_plat,
- .priv_auto = 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_plat *uc_pdata;
- uc_pdata = dev_get_uclass_plat(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_set_priv(dev, (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, ret;
- u32 reg;
- #ifdef CONFIG_MMC_OMAP36XX_PINS
- u32 wkup_ctrl = readl(OMAP34XX_CTRL_WKUP_CTRL);
- #endif
- rc = pmic_read(dev->parent, 0, (uint8_t *)®, sizeof(reg));
- if (rc)
- return rc;
- if (uV == 3300000)
- 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");
- #ifdef CONFIG_MMC_OMAP36XX_PINS
- if (get_cpu_family() == CPU_OMAP36XX) {
- /* Disable extended drain IO before changing PBIAS */
- wkup_ctrl &= ~OMAP34XX_CTRL_WKUP_CTRL_GPIO_IO_PWRDNZ;
- writel(wkup_ctrl, OMAP34XX_CTRL_WKUP_CTRL);
- }
- #endif
- ret = pmic_write(dev->parent, 0, (uint8_t *)®, sizeof(reg));
- #ifdef CONFIG_MMC_OMAP36XX_PINS
- if (get_cpu_family() == CPU_OMAP36XX) {
- /* Enable extended drain IO after changing PBIAS */
- writel(wkup_ctrl |
- OMAP34XX_CTRL_WKUP_CTRL_GPIO_IO_PWRDNZ,
- OMAP34XX_CTRL_WKUP_CTRL);
- }
- #endif
- return ret;
- }
- 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;
- #ifdef CONFIG_MMC_OMAP36XX_PINS
- u32 wkup_ctrl = readl(OMAP34XX_CTRL_WKUP_CTRL);
- #endif
- debug("Turning %s %s\n", enable ? "on" : "off", p->name);
- #ifdef CONFIG_MMC_OMAP36XX_PINS
- if (get_cpu_family() == CPU_OMAP36XX) {
- /* Disable extended drain IO before changing PBIAS */
- wkup_ctrl &= ~OMAP34XX_CTRL_WKUP_CTRL_GPIO_IO_PWRDNZ;
- writel(wkup_ctrl, OMAP34XX_CTRL_WKUP_CTRL);
- }
- #endif
- 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));
- #ifdef CONFIG_MMC_OMAP36XX_PINS
- if (get_cpu_family() == CPU_OMAP36XX) {
- /* Enable extended drain IO after changing PBIAS */
- writel(wkup_ctrl |
- OMAP34XX_CTRL_WKUP_CTRL_GPIO_IO_PWRDNZ,
- OMAP34XX_CTRL_WKUP_CTRL);
- }
- #endif
- 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,
- };
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