In the TI SOCs a PBIAS cell exists to provide a bias voltage to the MMC1 IO cells. Without this bias voltage these I/O cells can not function properly. The PBIAS cell is controlled by software. Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>master
Jean-Jacques Hiblot
7 years ago
committed by
Jaehoon Chung
parent
b5a144a501
commit
8ff7763d62
@ -0,0 +1,301 @@ |
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/*
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* (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com> |
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* Jean-Jacques Hiblot <jjhiblot@ti.com> |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <common.h> |
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#include <errno.h> |
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#include <dm.h> |
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#include <power/pmic.h> |
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#include <power/regulator.h> |
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#include <regmap.h> |
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#include <syscon.h> |
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#include <linux/bitops.h> |
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#include <linux/ioport.h> |
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#include <dm/read.h> |
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DECLARE_GLOBAL_DATA_PTR; |
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struct pbias_reg_info { |
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u32 enable; |
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u32 enable_mask; |
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u32 disable_val; |
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u32 vmode; |
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unsigned int enable_time; |
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char *name; |
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}; |
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struct pbias_priv { |
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struct regmap *regmap; |
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int offset; |
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}; |
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static const struct pmic_child_info pmic_children_info[] = { |
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{ .prefix = "pbias", .driver = "pbias_regulator"}, |
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{ }, |
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}; |
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static int pbias_write(struct udevice *dev, uint reg, const uint8_t *buff, |
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int len) |
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{ |
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struct pbias_priv *priv = dev_get_priv(dev); |
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u32 val = *(u32 *)buff; |
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if (len != 4) |
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return -EINVAL; |
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return regmap_write(priv->regmap, priv->offset, val); |
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} |
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static int pbias_read(struct udevice *dev, uint reg, uint8_t *buff, int len) |
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{ |
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struct pbias_priv *priv = dev_get_priv(dev); |
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if (len != 4) |
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return -EINVAL; |
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return regmap_read(priv->regmap, priv->offset, (u32 *)buff); |
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} |
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static int pbias_ofdata_to_platdata(struct udevice *dev) |
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{ |
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struct pbias_priv *priv = dev_get_priv(dev); |
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struct udevice *syscon; |
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struct regmap *regmap; |
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struct resource res; |
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int err; |
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err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev, |
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"syscon", &syscon); |
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if (err) { |
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error("%s: unable to find syscon device (%d)\n", __func__, |
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err); |
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return err; |
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} |
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regmap = syscon_get_regmap(syscon); |
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if (IS_ERR(regmap)) { |
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error("%s: unable to find regmap (%ld)\n", __func__, |
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PTR_ERR(regmap)); |
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return PTR_ERR(regmap); |
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} |
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priv->regmap = regmap; |
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err = dev_read_resource(dev, 0, &res); |
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if (err) { |
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error("%s: unable to find offset (%d)\n", __func__, err); |
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return err; |
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} |
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priv->offset = res.start; |
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return 0; |
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} |
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static int pbias_bind(struct udevice *dev) |
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{ |
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int children; |
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children = pmic_bind_children(dev, dev->node, pmic_children_info); |
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if (!children) |
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debug("%s: %s - no child found\n", __func__, dev->name); |
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return 0; |
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} |
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static struct dm_pmic_ops pbias_ops = { |
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.read = pbias_read, |
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.write = pbias_write, |
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}; |
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static const struct udevice_id pbias_ids[] = { |
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{ .compatible = "ti,pbias-dra7" }, |
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{ } |
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}; |
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U_BOOT_DRIVER(pbias_pmic) = { |
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.name = "pbias_pmic", |
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.id = UCLASS_PMIC, |
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.of_match = pbias_ids, |
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.bind = pbias_bind, |
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.ops = &pbias_ops, |
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.ofdata_to_platdata = pbias_ofdata_to_platdata, |
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.priv_auto_alloc_size = sizeof(struct pbias_priv), |
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}; |
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static const struct pbias_reg_info pbias_mmc_omap2430 = { |
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.enable = BIT(1), |
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.enable_mask = BIT(1), |
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.vmode = BIT(0), |
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.disable_val = 0, |
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.enable_time = 100, |
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.name = "pbias_mmc_omap2430" |
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}; |
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static const struct pbias_reg_info pbias_sim_omap3 = { |
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.enable = BIT(9), |
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.enable_mask = BIT(9), |
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.vmode = BIT(8), |
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.enable_time = 100, |
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.name = "pbias_sim_omap3" |
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}; |
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static const struct pbias_reg_info pbias_mmc_omap4 = { |
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.enable = BIT(26) | BIT(22), |
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.enable_mask = BIT(26) | BIT(25) | BIT(22), |
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.disable_val = BIT(25), |
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.vmode = BIT(21), |
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.enable_time = 100, |
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.name = "pbias_mmc_omap4" |
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}; |
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static const struct pbias_reg_info pbias_mmc_omap5 = { |
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.enable = BIT(27) | BIT(26), |
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.enable_mask = BIT(27) | BIT(25) | BIT(26), |
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.disable_val = BIT(25), |
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.vmode = BIT(21), |
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.enable_time = 100, |
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.name = "pbias_mmc_omap5" |
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}; |
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static const struct pbias_reg_info *pbias_reg_infos[] = { |
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&pbias_mmc_omap5, |
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&pbias_mmc_omap4, |
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&pbias_sim_omap3, |
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&pbias_mmc_omap2430, |
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NULL |
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}; |
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static int pbias_regulator_probe(struct udevice *dev) |
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{ |
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const struct pbias_reg_info **p = pbias_reg_infos; |
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struct dm_regulator_uclass_platdata *uc_pdata; |
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uc_pdata = dev_get_uclass_platdata(dev); |
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while (*p) { |
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int rc; |
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rc = dev_read_stringlist_search(dev, "regulator-name", |
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(*p)->name); |
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if (rc >= 0) { |
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debug("found regulator %s\n", (*p)->name); |
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break; |
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} else if (rc != -ENODATA) { |
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return rc; |
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} |
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p++; |
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} |
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if (!*p) { |
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int i = 0; |
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const char *s; |
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debug("regulator "); |
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while (dev_read_string_index(dev, "regulator-name", i++, &s) >= 0) |
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debug("%s'%s' ", (i > 1) ? ", " : "", s); |
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debug("%s not supported\n", (i > 2) ? "are" : "is"); |
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return -EINVAL; |
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} |
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uc_pdata->type = REGULATOR_TYPE_OTHER; |
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dev->priv = (void *)*p; |
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return 0; |
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} |
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static int pbias_regulator_get_value(struct udevice *dev) |
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{ |
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const struct pbias_reg_info *p = dev_get_priv(dev); |
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int rc; |
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u32 reg; |
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rc = pmic_read(dev->parent, 0, (uint8_t *)®, sizeof(reg)); |
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if (rc) |
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return rc; |
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debug("%s voltage id %s\n", p->name, |
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(reg & p->vmode) ? "3.0v" : "1.8v"); |
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return (reg & p->vmode) ? 3000000 : 1800000; |
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} |
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static int pbias_regulator_set_value(struct udevice *dev, int uV) |
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{ |
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const struct pbias_reg_info *p = dev_get_priv(dev); |
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int rc; |
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u32 reg; |
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debug("Setting %s voltage to %s\n", p->name, |
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(reg & p->vmode) ? "3.0v" : "1.8v"); |
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rc = pmic_read(dev->parent, 0, (uint8_t *)®, sizeof(reg)); |
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if (rc) |
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return rc; |
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if (uV == 3000000) |
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reg |= p->vmode; |
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else if (uV == 1800000) |
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reg &= ~p->vmode; |
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else |
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return -EINVAL; |
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return pmic_write(dev->parent, 0, (uint8_t *)®, sizeof(reg)); |
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} |
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static int pbias_regulator_get_enable(struct udevice *dev) |
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{ |
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const struct pbias_reg_info *p = dev_get_priv(dev); |
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int rc; |
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u32 reg; |
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rc = pmic_read(dev->parent, 0, (uint8_t *)®, sizeof(reg)); |
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if (rc) |
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return rc; |
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debug("%s id %s\n", p->name, |
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(reg & p->enable_mask) == (p->disable_val) ? "on" : "off"); |
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return (reg & p->enable_mask) == (p->disable_val); |
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} |
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static int pbias_regulator_set_enable(struct udevice *dev, bool enable) |
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{ |
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const struct pbias_reg_info *p = dev_get_priv(dev); |
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int rc; |
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u32 reg; |
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debug("Turning %s %s\n", enable ? "on" : "off", p->name); |
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rc = pmic_read(dev->parent, 0, (uint8_t *)®, sizeof(reg)); |
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if (rc) |
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return rc; |
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reg &= ~p->enable_mask; |
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if (enable) |
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reg |= p->enable; |
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else |
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reg |= p->disable_val; |
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rc = pmic_write(dev->parent, 0, (uint8_t *)®, sizeof(reg)); |
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if (rc) |
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return rc; |
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if (enable) |
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udelay(p->enable_time); |
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return 0; |
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} |
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static const struct dm_regulator_ops pbias_regulator_ops = { |
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.get_value = pbias_regulator_get_value, |
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.set_value = pbias_regulator_set_value, |
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.get_enable = pbias_regulator_get_enable, |
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.set_enable = pbias_regulator_set_enable, |
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}; |
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U_BOOT_DRIVER(pbias_regulator) = { |
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.name = "pbias_regulator", |
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.id = UCLASS_REGULATOR, |
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.ops = &pbias_regulator_ops, |
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.probe = pbias_regulator_probe, |
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}; |
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