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478c563b40
drive-strength-microamp is a new feature needed for G12A SoC. the default DS setting after boot is usually 500uA and it is not enough for many functions. We need to be able to set the drive strength to reliably enable things like MMC, I2C, etc ... Signed-off-by: Guillaume La Roque <glaroque@baylibre.com> Tested-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
161 lines
4.5 KiB
C
161 lines
4.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2016 - Beniamino Galvani <b.galvani@gmail.com>
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*/
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#ifndef __PINCTRL_MESON_H__
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#define __PINCTRL_MESON_H__
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#include <linux/types.h>
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struct meson_pmx_group {
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const char *name;
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const unsigned int *pins;
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unsigned int num_pins;
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const void *data;
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};
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struct meson_pmx_func {
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const char *name;
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const char * const *groups;
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unsigned int num_groups;
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};
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struct meson_pinctrl_data {
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const char *name;
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struct meson_pmx_group *groups;
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struct meson_pmx_func *funcs;
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struct meson_bank *banks;
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unsigned int pin_base;
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unsigned int num_pins;
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unsigned int num_groups;
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unsigned int num_funcs;
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unsigned int num_banks;
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const struct driver *gpio_driver;
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void *pmx_data;
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};
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struct meson_pinctrl {
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struct meson_pinctrl_data *data;
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void __iomem *reg_mux;
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void __iomem *reg_gpio;
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void __iomem *reg_pull;
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void __iomem *reg_pullen;
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void __iomem *reg_ds;
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};
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/**
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* struct meson_reg_desc - a register descriptor
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*
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* @reg: register offset in the regmap
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* @bit: bit index in register
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*
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* The structure describes the information needed to control pull,
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* pull-enable, direction, etc. for a single pin
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*/
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struct meson_reg_desc {
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unsigned int reg;
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unsigned int bit;
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};
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/**
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* enum meson_pinconf_drv - value of drive-strength supported
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*/
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enum meson_pinconf_drv {
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MESON_PINCONF_DRV_500UA,
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MESON_PINCONF_DRV_2500UA,
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MESON_PINCONF_DRV_3000UA,
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MESON_PINCONF_DRV_4000UA,
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};
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/**
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* enum meson_reg_type - type of registers encoded in @meson_reg_desc
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*/
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enum meson_reg_type {
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REG_PULLEN,
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REG_PULL,
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REG_DIR,
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REG_OUT,
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REG_IN,
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REG_DS,
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NUM_REG,
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};
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/**
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* struct meson bank
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*
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* @name: bank name
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* @first: first pin of the bank
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* @last: last pin of the bank
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* @regs: array of register descriptors
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*
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* A bank represents a set of pins controlled by a contiguous set of
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* bits in the domain registers. The structure specifies which bits in
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* the regmap control the different functionalities. Each member of
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* the @regs array refers to the first pin of the bank.
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*/
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struct meson_bank {
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const char *name;
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unsigned int first;
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unsigned int last;
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struct meson_reg_desc regs[NUM_REG];
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};
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#define PIN(x, b) (b + x)
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#define FUNCTION(fn) \
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{ \
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.name = #fn, \
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.groups = fn ## _groups, \
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.num_groups = ARRAY_SIZE(fn ## _groups), \
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}
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#define BANK_DS(n, f, l, per, peb, pr, pb, dr, db, or, ob, ir, ib, \
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dsr, dsb) \
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{ \
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.name = n, \
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.first = f, \
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.last = l, \
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.regs = { \
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[REG_PULLEN] = {per, peb}, \
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[REG_PULL] = {pr, pb}, \
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[REG_DIR] = {dr, db}, \
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[REG_OUT] = { or, ob}, \
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[REG_IN] = {ir, ib}, \
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[REG_DS] = {dsr, dsb}, \
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}, \
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}
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#define BANK(n, f, l, per, peb, pr, pb, dr, db, or, ob, ir, ib) \
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BANK_DS(n, f, l, per, peb, pr, pb, dr, db, or, ob, ir, ib, 0, 0)
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#define MESON_PIN(x, b) PINCTRL_PIN(PIN(x, b), #x)
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extern const struct pinctrl_ops meson_pinctrl_ops;
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int meson_pinctrl_get_groups_count(struct udevice *dev);
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const char *meson_pinctrl_get_group_name(struct udevice *dev,
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unsigned int selector);
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int meson_pinctrl_get_pins_count(struct udevice *dev);
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const char *meson_pinctrl_get_pin_name(struct udevice *dev,
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unsigned int selector);
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int meson_pinmux_get_functions_count(struct udevice *dev);
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const char *meson_pinmux_get_function_name(struct udevice *dev,
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unsigned int selector);
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int meson_pinctrl_probe(struct udevice *dev);
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int meson_gpio_get(struct udevice *dev, unsigned int offset);
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int meson_gpio_set(struct udevice *dev, unsigned int offset, int value);
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int meson_gpio_get_direction(struct udevice *dev, unsigned int offset);
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int meson_gpio_direction_input(struct udevice *dev, unsigned int offset);
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int meson_gpio_direction_output(struct udevice *dev, unsigned int offset,
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int value);
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int meson_gpio_probe(struct udevice *dev);
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int meson_pinconf_set(struct udevice *dev, unsigned int pin,
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unsigned int param, unsigned int arg);
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int meson_pinconf_group_set(struct udevice *dev,
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unsigned int group_selector,
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unsigned int param, unsigned int arg);
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#endif /* __PINCTRL_MESON_H__ */
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