[U-Boot] [PATCH v3] regulator: pbias: Add PBIAS regulator for proper voltage switching on MMC1
Jean-Jacques Hiblot
jjhiblot at ti.com
Mon Aug 7 09:43:36 UTC 2017
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>
---
Hi Jaehoon,
Here is the patch for the PBIAS regulator. I modified the KConfig to select
the REGMAP and SYSCON features as you suggested.
Thanks.
JJ
changes since v2:
- automatically select REGMAP and SYSCON if PBIAS is selected.
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 | 13 ++
drivers/power/regulator/Makefile | 1 +
drivers/power/regulator/pbias_regulator.c | 302 ++++++++++++++++++++++++++++++
4 files changed, 317 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..cb5ea08 100644
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -142,6 +142,19 @@ 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"
+ depends on DM_REGULATOR
+ select REGMAP
+ select SYSCON
+ ---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 *)®, 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 *)®, 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 *)®, 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 *)®, 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 *)®, 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));
+ 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,
+};
--
1.9.1
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