[U-Boot] [U-Boot, v2, 2/3] regulator: pbias: Add PBIAS regulator for proper voltage switching on MMC1

Jaehoon Chung jh80.chung at samsung.com
Fri Jul 28 12:59:43 UTC 2017


On 07/19/2017 10:52 PM, Jean-Jacques Hiblot wrote:
> 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 at ti.com>
> Reviewed-by: Tom Rini <trini at konsulko.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>


Applied to u-boot-mmc. Thanks!

Best Regards,
Jaehoon Chung

> ---
> 
> changes since v1:
>  - automatically select the PBIAS driver if DM_REGULATOR, DM_MMC and
>    MMC_OMAP_HS are set
>  - use the dev_read_*() API to access the DT
> 
>  drivers/mmc/Kconfig                       |   1 +
>  drivers/power/regulator/Kconfig           |  10 +
>  drivers/power/regulator/Makefile          |   1 +
>  drivers/power/regulator/pbias_regulator.c | 302 ++++++++++++++++++++++++++++++
>  4 files changed, 314 insertions(+)
>  create mode 100644 drivers/power/regulator/pbias_regulator.c
> 
> diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
> index 588e118..63e1122 100644
> --- a/drivers/mmc/Kconfig
> +++ b/drivers/mmc/Kconfig
> @@ -158,6 +158,7 @@ config MMC_PCI
>  config MMC_OMAP_HS
>  	bool "TI OMAP High Speed Multimedia Card Interface support"
>  	select DM_MMC_OPS if DM_MMC
> +	select DM_REGULATOR_PBIAS if DM_MMC && DM_REGULATOR
>  	help
>  	  This selects the TI OMAP High Speed Multimedia card Interface.
>  	  If you have an omap2plus board with a Multimedia Card slot,
> diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
> index f213487..f4ed3cc 100644
> --- a/drivers/power/regulator/Kconfig
> +++ b/drivers/power/regulator/Kconfig
> @@ -142,6 +142,16 @@ config DM_REGULATOR_PALMAS
>  	features for REGULATOR PALMAS and the family of PALMAS PMICs.
>  	The driver implements get/set api for: value and enable.
>  
> +config DM_REGULATOR_PBIAS
> +	bool "Enable driver for PBIAS regulator"
> +	---help---
> +	This enables implementation of driver-model regulator uclass
> +	features for pseudo-regulator PBIAS found in the OMAP SOCs.
> +	This pseudo-regulator is used to provide a BIAS voltage to MMC1
> +	signal pads and must be configured properly during a voltage switch.
> +	Voltage switching is required by some operating modes of SDcards and
> +	eMMC.
> +
>  config DM_REGULATOR_LP873X
>  	bool "Enable driver for LP873X PMIC regulators"
>          depends on PMIC_LP873X
> diff --git a/drivers/power/regulator/Makefile b/drivers/power/regulator/Makefile
> index ce14d08..75d611a 100644
> --- a/drivers/power/regulator/Makefile
> +++ b/drivers/power/regulator/Makefile
> @@ -17,5 +17,6 @@ obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
>  obj-$(CONFIG_DM_REGULATOR_SANDBOX) += sandbox.o
>  obj-$(CONFIG_REGULATOR_TPS65090) += tps65090_regulator.o
>  obj-$(CONFIG_$(SPL_)DM_REGULATOR_PALMAS) += palmas_regulator.o
> +obj-$(CONFIG_$(SPL_)DM_REGULATOR_PBIAS) += pbias_regulator.o
>  obj-$(CONFIG_$(SPL_)DM_REGULATOR_LP873X) += lp873x_regulator.o
>  obj-$(CONFIG_$(SPL_)DM_REGULATOR_LP87565) += lp87565_regulator.o
> diff --git a/drivers/power/regulator/pbias_regulator.c b/drivers/power/regulator/pbias_regulator.c
> new file mode 100644
> index 0000000..303eca9
> --- /dev/null
> +++ b/drivers/power/regulator/pbias_regulator.c
> @@ -0,0 +1,302 @@
> +/*
> + * (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com>
> + * Jean-Jacques Hiblot <jjhiblot at ti.com>
> + *
> + * SPDX-License-Identifier:	GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <errno.h>
> +#include <dm.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/read.h>
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +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);
> +	uint32_t val = *(uint32_t *)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, (uint32_t *)buff);
> +}
> +
> +static int pbias_ofdata_to_platdata(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) {
> +		error("%s: unable to find syscon device (%d)\n", __func__,
> +		      err);
> +		return err;
> +	}
> +
> +	regmap = syscon_get_regmap(syscon);
> +	if (IS_ERR(regmap)) {
> +		error("%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) {
> +		error("%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->node, 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" },
> +	{ }
> +};
> +
> +U_BOOT_DRIVER(pbias_pmic) = {
> +	.name = "pbias_pmic",
> +	.id = UCLASS_PMIC,
> +	.of_match = pbias_ids,
> +	.bind = pbias_bind,
> +	.ops = &pbias_ops,
> +	.ofdata_to_platdata = pbias_ofdata_to_platdata,
> +	.priv_auto_alloc_size = 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_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) {
> +			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->priv = (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;
> +	uint32_t reg;
> +
> +	rc = pmic_read(dev->parent, 0, (uint8_t *)&reg, 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;
> +	uint32_t reg;
> +
> +	debug("Setting %s voltage to %s\n", p->name,
> +	      (reg & p->vmode) ? "3.0v" : "1.8v");
> +
> +	rc = pmic_read(dev->parent, 0, (uint8_t *)&reg, sizeof(reg));
> +	if (rc)
> +		return rc;
> +
> +	if (uV == 3000000)
> +		reg |= p->vmode;
> +	else if (uV == 1800000)
> +		reg &= ~p->vmode;
> +	else
> +		return -EINVAL;
> +
> +	return pmic_write(dev->parent, 0, (uint8_t *)&reg, sizeof(reg));
> +}
> +
> +static int pbias_regulator_get_enable(struct udevice *dev)
> +{
> +	const struct pbias_reg_info *p = dev_get_priv(dev);
> +	int rc;
> +	uint32_t reg;
> +
> +	rc = pmic_read(dev->parent, 0, (uint8_t *)&reg, 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;
> +	uint32_t reg;
> +
> +	debug("Turning %s %s\n", enable ? "on" : "off", p->name);
> +
> +	rc = pmic_read(dev->parent, 0, (uint8_t *)&reg, 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 *)&reg, sizeof(reg));
> +	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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