regulator: pbias: Add PBIAS regulator for proper voltage switching on MMC1
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>
This commit is contained in:
Jean-Jacques Hiblot
Jaehoon Chung
parent
b5a144a501
commit
8ff7763d62
@ -136,6 +136,7 @@ config MMC_PCI
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config MMC_OMAP_HS
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bool "TI OMAP High Speed Multimedia Card Interface support"
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select DM_REGULATOR_PBIAS if DM_MMC && DM_REGULATOR
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select DM_REGULATOR_PBIAS if DM_MMC && DM_REGULATOR
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help
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This selects the TI OMAP High Speed Multimedia card Interface.
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If you have an omap2plus board with a Multimedia Card slot,
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@ -151,6 +151,19 @@ config DM_REGULATOR_PALMAS
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features for REGULATOR PALMAS and the family of PALMAS PMICs.
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The driver implements get/set api for: value and enable.
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config DM_REGULATOR_PBIAS
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bool "Enable driver for PBIAS regulator"
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depends on DM_REGULATOR
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select REGMAP
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select SYSCON
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---help---
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This enables implementation of driver-model regulator uclass
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features for pseudo-regulator PBIAS found in the OMAP SOCs.
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This pseudo-regulator is used to provide a BIAS voltage to MMC1
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signal pads and must be configured properly during a voltage switch.
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Voltage switching is required by some operating modes of SDcards and
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eMMC.
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config DM_REGULATOR_LP873X
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bool "Enable driver for LP873X PMIC regulators"
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depends on PMIC_LP873X
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@ -18,5 +18,6 @@ obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
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obj-$(CONFIG_DM_REGULATOR_SANDBOX) += sandbox.o
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obj-$(CONFIG_REGULATOR_TPS65090) += tps65090_regulator.o
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obj-$(CONFIG_$(SPL_)DM_REGULATOR_PALMAS) += palmas_regulator.o
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obj-$(CONFIG_$(SPL_)DM_REGULATOR_PBIAS) += pbias_regulator.o
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obj-$(CONFIG_$(SPL_)DM_REGULATOR_LP873X) += lp873x_regulator.o
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obj-$(CONFIG_$(SPL_)DM_REGULATOR_LP87565) += lp87565_regulator.o
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301
drivers/power/regulator/pbias_regulator.c
Normal file
301
drivers/power/regulator/pbias_regulator.c
Normal file
@ -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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