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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright 2022 William Breathitt Gray */
#ifndef _I8255_H_
#define _I8255_H_
#include <linux/spinlock.h>
#include <linux/types.h>
/**
* struct i8255 - Intel 8255 register structure
* @port: Port A, B, and C
* @control: Control register
*/
struct i8255 {
u8 port[3];
u8 control;
};
/**
* struct i8255_state - Intel 8255 state structure
* @lock: synchronization lock for accessing device state
* @control_state: Control register state
*/
struct i8255_state {
spinlock_t lock;
u8 control_state;
};
struct device;
struct irq_domain;
struct regmap;
#define i8255_volatile_regmap_range(_base) regmap_reg_range(_base, _base + 0x2)
/**
* struct i8255_regmap_config - Configuration for the register map of an i8255
* @parent: parent device
* @map: regmap for the i8255
* @num_ppi: number of i8255 Programmable Peripheral Interface
* @names: (optional) array of names for gpios
* @domain: (optional) IRQ domain if the controller is interrupt-capable
*
* Note: The regmap is expected to have cache enabled and i8255 control
* registers not marked as volatile.
*/
struct i8255_regmap_config {
struct device *parent;
struct regmap *map;
int num_ppi;
const char *const *names;
struct irq_domain *domain;
};
int devm_i8255_regmap_register(struct device *dev,
const struct i8255_regmap_config *config);
void i8255_direction_input(struct i8255 __iomem *ppi, struct i8255_state *state,
unsigned long offset);
void i8255_direction_output(struct i8255 __iomem *ppi,
struct i8255_state *state, unsigned long offset,
unsigned long value);
int i8255_get(struct i8255 __iomem *ppi, unsigned long offset);
int i8255_get_direction(const struct i8255_state *state, unsigned long offset);
void i8255_get_multiple(struct i8255 __iomem *ppi, const unsigned long *mask,
unsigned long *bits, unsigned long ngpio);
void i8255_mode0_output(struct i8255 __iomem *const ppi);
void i8255_set(struct i8255 __iomem *ppi, struct i8255_state *state,
unsigned long offset, unsigned long value);
void i8255_set_multiple(struct i8255 __iomem *ppi, struct i8255_state *state,
const unsigned long *mask, const unsigned long *bits,
unsigned long ngpio);
void i8255_state_init(struct i8255_state *const state, unsigned long nbanks);
#endif /* _I8255_H_ */
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