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

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@ti.com Reviewed-by: Tom Rini trini@konsulko.com Reviewed-by: Simon Glass sjg@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@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,

+};