/arch/mips/include/asm/mach-pnx833x/gpio.h

  1/* SPDX-License-Identifier: GPL-2.0-or-later */
  2/*
  3 *  gpio.h: GPIO Support for PNX833X.
  4 *
  5 *  Copyright 2008 NXP Semiconductors
  6 *	  Chris Steel <chris.steel@nxp.com>
  7 *    Daniel Laird <daniel.j.laird@nxp.com>
  8 */
  9#ifndef __ASM_MIPS_MACH_PNX833X_GPIO_H
 10#define __ASM_MIPS_MACH_PNX833X_GPIO_H
 11
 12/* BIG FAT WARNING: races danger!
 13   No protections exist here. Current users are only early init code,
 14   when locking is not needed because no concurrency yet exists there,
 15   and GPIO IRQ dispatcher, which does locking.
 16   However, if many uses will ever happen, proper locking will be needed
 17   - including locking between different uses
 18*/
 19
 20#include <asm/mach-pnx833x/pnx833x.h>
 21
 22#define SET_REG_BIT(reg, bit)		do { (reg |= (1 << (bit))); } while (0)
 23#define CLEAR_REG_BIT(reg, bit)		do { (reg &= ~(1 << (bit))); } while (0)
 24
 25/* Initialize GPIO to a known state */
 26static inline void pnx833x_gpio_init(void)
 27{
 28	PNX833X_PIO_DIR = 0;
 29	PNX833X_PIO_DIR2 = 0;
 30	PNX833X_PIO_SEL = 0;
 31	PNX833X_PIO_SEL2 = 0;
 32	PNX833X_PIO_INT_EDGE = 0;
 33	PNX833X_PIO_INT_HI = 0;
 34	PNX833X_PIO_INT_LO = 0;
 35
 36	/* clear any GPIO interrupt requests */
 37	PNX833X_PIO_INT_CLEAR = 0xffff;
 38	PNX833X_PIO_INT_CLEAR = 0;
 39	PNX833X_PIO_INT_ENABLE = 0;
 40}
 41
 42/* Select GPIO direction for a pin */
 43static inline void pnx833x_gpio_select_input(unsigned int pin)
 44{
 45	if (pin < 32)
 46		CLEAR_REG_BIT(PNX833X_PIO_DIR, pin);
 47	else
 48		CLEAR_REG_BIT(PNX833X_PIO_DIR2, pin & 31);
 49}
 50static inline void pnx833x_gpio_select_output(unsigned int pin)
 51{
 52	if (pin < 32)
 53		SET_REG_BIT(PNX833X_PIO_DIR, pin);
 54	else
 55		SET_REG_BIT(PNX833X_PIO_DIR2, pin & 31);
 56}
 57
 58/* Select GPIO or alternate function for a pin */
 59static inline void pnx833x_gpio_select_function_io(unsigned int pin)
 60{
 61	if (pin < 32)
 62		CLEAR_REG_BIT(PNX833X_PIO_SEL, pin);
 63	else
 64		CLEAR_REG_BIT(PNX833X_PIO_SEL2, pin & 31);
 65}
 66static inline void pnx833x_gpio_select_function_alt(unsigned int pin)
 67{
 68	if (pin < 32)
 69		SET_REG_BIT(PNX833X_PIO_SEL, pin);
 70	else
 71		SET_REG_BIT(PNX833X_PIO_SEL2, pin & 31);
 72}
 73
 74/* Read GPIO pin */
 75static inline int pnx833x_gpio_read(unsigned int pin)
 76{
 77	if (pin < 32)
 78		return (PNX833X_PIO_IN >> pin) & 1;
 79	else
 80		return (PNX833X_PIO_IN2 >> (pin & 31)) & 1;
 81}
 82
 83/* Write GPIO pin */
 84static inline void pnx833x_gpio_write(unsigned int val, unsigned int pin)
 85{
 86	if (pin < 32) {
 87		if (val)
 88			SET_REG_BIT(PNX833X_PIO_OUT, pin);
 89		else
 90			CLEAR_REG_BIT(PNX833X_PIO_OUT, pin);
 91	} else {
 92		if (val)
 93			SET_REG_BIT(PNX833X_PIO_OUT2, pin & 31);
 94		else
 95			CLEAR_REG_BIT(PNX833X_PIO_OUT2, pin & 31);
 96	}
 97}
 98
 99/* Configure GPIO interrupt */
100#define GPIO_INT_NONE		0
101#define GPIO_INT_LEVEL_LOW	1
102#define GPIO_INT_LEVEL_HIGH	2
103#define GPIO_INT_EDGE_RISING	3
104#define GPIO_INT_EDGE_FALLING	4
105#define GPIO_INT_EDGE_BOTH	5
106static inline void pnx833x_gpio_setup_irq(int when, unsigned int pin)
107{
108	switch (when) {
109	case GPIO_INT_LEVEL_LOW:
110		CLEAR_REG_BIT(PNX833X_PIO_INT_EDGE, pin);
111		CLEAR_REG_BIT(PNX833X_PIO_INT_HI, pin);
112		SET_REG_BIT(PNX833X_PIO_INT_LO, pin);
113		break;
114	case GPIO_INT_LEVEL_HIGH:
115		CLEAR_REG_BIT(PNX833X_PIO_INT_EDGE, pin);
116		SET_REG_BIT(PNX833X_PIO_INT_HI, pin);
117		CLEAR_REG_BIT(PNX833X_PIO_INT_LO, pin);
118		break;
119	case GPIO_INT_EDGE_RISING:
120		SET_REG_BIT(PNX833X_PIO_INT_EDGE, pin);
121		SET_REG_BIT(PNX833X_PIO_INT_HI, pin);
122		CLEAR_REG_BIT(PNX833X_PIO_INT_LO, pin);
123		break;
124	case GPIO_INT_EDGE_FALLING:
125		SET_REG_BIT(PNX833X_PIO_INT_EDGE, pin);
126		CLEAR_REG_BIT(PNX833X_PIO_INT_HI, pin);
127		SET_REG_BIT(PNX833X_PIO_INT_LO, pin);
128		break;
129	case GPIO_INT_EDGE_BOTH:
130		SET_REG_BIT(PNX833X_PIO_INT_EDGE, pin);
131		SET_REG_BIT(PNX833X_PIO_INT_HI, pin);
132		SET_REG_BIT(PNX833X_PIO_INT_LO, pin);
133		break;
134	default:
135		CLEAR_REG_BIT(PNX833X_PIO_INT_EDGE, pin);
136		CLEAR_REG_BIT(PNX833X_PIO_INT_HI, pin);
137		CLEAR_REG_BIT(PNX833X_PIO_INT_LO, pin);
138		break;
139	}
140}
141
142/* Enable/disable GPIO interrupt */
143static inline void pnx833x_gpio_enable_irq(unsigned int pin)
144{
145	SET_REG_BIT(PNX833X_PIO_INT_ENABLE, pin);
146}
147static inline void pnx833x_gpio_disable_irq(unsigned int pin)
148{
149	CLEAR_REG_BIT(PNX833X_PIO_INT_ENABLE, pin);
150}
151
152/* Clear GPIO interrupt request */
153static inline void pnx833x_gpio_clear_irq(unsigned int pin)
154{
155	SET_REG_BIT(PNX833X_PIO_INT_CLEAR, pin);
156	CLEAR_REG_BIT(PNX833X_PIO_INT_CLEAR, pin);
157}
158
159#endif