1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * A gpio chip driver for TXx9 SoCs
4 *
5 * Copyright (C) 2008 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
6 */
7
8#include <linux/init.h>
9#include <linux/spinlock.h>
10#include <linux/gpio/driver.h>
11#include <linux/errno.h>
12#include <linux/io.h>
13#include <asm/txx9pio.h>
14
15static DEFINE_SPINLOCK(txx9_gpio_lock);
16
17static struct txx9_pio_reg __iomem *txx9_pioptr;
18
19static int txx9_gpio_get(struct gpio_chip *chip, unsigned int offset)
20{
21	return !!(__raw_readl(&txx9_pioptr->din) & (1 << offset));
22}
23
24static void txx9_gpio_set_raw(unsigned int offset, int value)
25{
26	u32 val;
27	val = __raw_readl(&txx9_pioptr->dout);
28	if (value)
29		val |= 1 << offset;
30	else
31		val &= ~(1 << offset);
32	__raw_writel(val, &txx9_pioptr->dout);
33}
34
35static void txx9_gpio_set(struct gpio_chip *chip, unsigned int offset,
36			  int value)
37{
38	unsigned long flags;
39	spin_lock_irqsave(&txx9_gpio_lock, flags);
40	txx9_gpio_set_raw(offset, value);
41	mmiowb();
42	spin_unlock_irqrestore(&txx9_gpio_lock, flags);
43}
44
45static int txx9_gpio_dir_in(struct gpio_chip *chip, unsigned int offset)
46{
47	unsigned long flags;
48	spin_lock_irqsave(&txx9_gpio_lock, flags);
49	__raw_writel(__raw_readl(&txx9_pioptr->dir) & ~(1 << offset),
50		     &txx9_pioptr->dir);
51	mmiowb();
52	spin_unlock_irqrestore(&txx9_gpio_lock, flags);
53	return 0;
54}
55
56static int txx9_gpio_dir_out(struct gpio_chip *chip, unsigned int offset,
57			     int value)
58{
59	unsigned long flags;
60	spin_lock_irqsave(&txx9_gpio_lock, flags);
61	txx9_gpio_set_raw(offset, value);
62	__raw_writel(__raw_readl(&txx9_pioptr->dir) | (1 << offset),
63		     &txx9_pioptr->dir);
64	mmiowb();
65	spin_unlock_irqrestore(&txx9_gpio_lock, flags);
66	return 0;
67}
68
69static struct gpio_chip txx9_gpio_chip = {
70	.get = txx9_gpio_get,
71	.set = txx9_gpio_set,
72	.direction_input = txx9_gpio_dir_in,
73	.direction_output = txx9_gpio_dir_out,
74	.label = "TXx9",
75};
76
77int __init txx9_gpio_init(unsigned long baseaddr,
78			  unsigned int base, unsigned int num)
79{
80	txx9_pioptr = ioremap(baseaddr, sizeof(struct txx9_pio_reg));
81	if (!txx9_pioptr)
82		return -ENODEV;
83	txx9_gpio_chip.base = base;
84	txx9_gpio_chip.ngpio = num;
85	return gpiochip_add_data(&txx9_gpio_chip, NULL);
86}
87