Port a subset of Linux driver sufficient enough to support feature needed for PCIe on i.MX7.
Signed-off-by: Andrey Smirnov <[email protected]> --- drivers/regulator/Kconfig | 8 ++ drivers/regulator/Makefile | 3 +- drivers/regulator/anatop-regulator.c | 161 +++++++++++++++++++++++++++ 3 files changed, 171 insertions(+), 1 deletion(-) create mode 100644 drivers/regulator/anatop-regulator.c diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 92db8dc0e..c734ef5ef 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -21,4 +21,12 @@ config REGULATOR_PFUZE depends on I2C depends on ARCH_IMX6 +config REGULATOR_ANATOP + tristate "Freescale i.MX on-chip ANATOP LDO regulators" + depends on MFD_SYSCON + help + Say y here to support Freescale i.MX on-chip ANATOP LDOs + regulators. It is recommended that this option be + enabled on i.MX6 platform. + endif diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 36ce3e87f..b2fc5b79b 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -1,4 +1,5 @@ obj-$(CONFIG_REGULATOR) += core.o helpers.o obj-$(CONFIG_REGULATOR_FIXED) += fixed.o obj-$(CONFIG_REGULATOR_BCM283X) += bcm2835.o -obj-$(CONFIG_REGULATOR_PFUZE) += pfuze.o \ No newline at end of file +obj-$(CONFIG_REGULATOR_PFUZE) += pfuze.o +obj-$(CONFIG_REGULATOR_ANATOP) += anatop-regulator.o \ No newline at end of file diff --git a/drivers/regulator/anatop-regulator.c b/drivers/regulator/anatop-regulator.c new file mode 100644 index 000000000..3944fd592 --- /dev/null +++ b/drivers/regulator/anatop-regulator.c @@ -0,0 +1,161 @@ +/* + * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include <common.h> +#include <init.h> +#include <mfd/syscon.h> +#include <regmap.h> +#include <regulator.h> + +struct anatop_regulator { + u32 control_reg; + struct regmap *anatop; + int vol_bit_shift; + int vol_bit_width; + u32 delay_reg; + int delay_bit_shift; + int delay_bit_width; + int min_bit_val; + int min_voltage; + int max_voltage; + + struct regulator_dev rdev; + struct regulator_desc rdesc; + + bool bypass; + int sel; +}; + +static struct regulator_ops anatop_rops = { + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .list_voltage = regulator_list_voltage_linear, +}; + +static int anatop_regulator_probe(struct device_d *dev) +{ + struct device_node *np = dev->device_node; + struct device_node *anatop_np; + struct regulator_desc *rdesc; + struct regulator_dev *rdev; + struct anatop_regulator *sreg; + int ret = 0; + + sreg = xzalloc(sizeof(*sreg)); + rdesc = &sreg->rdesc; + rdev = &sreg->rdev; + + anatop_np = of_get_parent(np); + if (!anatop_np) + return -ENODEV; + + rdev->desc = rdesc; + rdev->regmap = syscon_node_to_regmap(anatop_np); + if (IS_ERR(rdev->regmap)) + return PTR_ERR(rdev->regmap); + + ret = of_property_read_u32(np, "anatop-reg-offset", + &sreg->control_reg); + if (ret) { + dev_err(dev, "no anatop-reg-offset property set\n"); + return ret; + } + ret = of_property_read_u32(np, "anatop-vol-bit-width", + &sreg->vol_bit_width); + if (ret) { + dev_err(dev, "no anatop-vol-bit-width property set\n"); + return ret; + } + ret = of_property_read_u32(np, "anatop-vol-bit-shift", + &sreg->vol_bit_shift); + if (ret) { + dev_err(dev, "no anatop-vol-bit-shift property set\n"); + return ret; + } + ret = of_property_read_u32(np, "anatop-min-bit-val", + &sreg->min_bit_val); + if (ret) { + dev_err(dev, "no anatop-min-bit-val property set\n"); + return ret; + } + ret = of_property_read_u32(np, "anatop-min-voltage", + &sreg->min_voltage); + if (ret) { + dev_err(dev, "no anatop-min-voltage property set\n"); + return ret; + } + ret = of_property_read_u32(np, "anatop-max-voltage", + &sreg->max_voltage); + if (ret) { + dev_err(dev, "no anatop-max-voltage property set\n"); + return ret; + } + + /* read LDO ramp up setting, only for core reg */ + of_property_read_u32(np, "anatop-delay-reg-offset", + &sreg->delay_reg); + of_property_read_u32(np, "anatop-delay-bit-width", + &sreg->delay_bit_width); + of_property_read_u32(np, "anatop-delay-bit-shift", + &sreg->delay_bit_shift); + + rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage) / 25000 + 1 + + sreg->min_bit_val; + rdesc->min_uV = sreg->min_voltage; + rdesc->uV_step = 25000; + rdesc->linear_min_sel = sreg->min_bit_val; + rdesc->vsel_reg = sreg->control_reg; + rdesc->vsel_mask = GENMASK(sreg->vol_bit_width + sreg->vol_bit_shift, + sreg->vol_bit_shift); + + /* Only core regulators have the ramp up delay configuration. */ + if (sreg->control_reg && sreg->delay_bit_width) { + free(sreg); + return -ENODEV; + } else { + u32 enable_bit; + + rdesc->ops = &anatop_rops; + + if (!of_property_read_u32(np, "anatop-enable-bit", + &enable_bit)) { + anatop_rops.enable = regulator_enable_regmap; + anatop_rops.disable = regulator_disable_regmap; + anatop_rops.is_enabled = regulator_is_enabled_regmap; + + rdesc->enable_reg = sreg->control_reg; + rdesc->enable_mask = BIT(enable_bit); + } + } + + return of_regulator_register(rdev, dev->device_node); +} + +static const struct of_device_id of_anatop_regulator_match_tbl[] = { + { .compatible = "fsl,anatop-regulator", }, + { /* end */ } +}; + +static struct driver_d anatop_regulator_driver = { + .name = "anatop_regulator", + .probe = anatop_regulator_probe, + .of_compatible = DRV_OF_COMPAT(of_anatop_regulator_match_tbl), +}; +device_platform_driver(anatop_regulator_driver); + -- 2.20.1 _______________________________________________ barebox mailing list [email protected] http://lists.infradead.org/mailman/listinfo/barebox
