1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (C) Copyright 2016 - Beniamino Galvani <b.galvani@gmail.com>
4 */
5
6#include <log.h>
7#include <asm/gpio.h>
8#include <common.h>
9#include <dm.h>
10#include <dm/pinctrl.h>
11#include <linux/bitops.h>
12#include <linux/io.h>
13#include "pinctrl-meson-gx.h"
14
15static void meson_gx_pinmux_disable_other_groups(struct meson_pinctrl *priv,
16						 unsigned int pin,
17						 int sel_group)
18{
19	struct meson_pmx_group *group;
20	struct meson_gx_pmx_data *pmx_data;
21	void __iomem *addr;
22	int i, j;
23
24	for (i = 0; i < priv->data->num_groups; i++) {
25		group = &priv->data->groups[i];
26		pmx_data = (struct meson_gx_pmx_data *)group->data;
27		if (pmx_data->is_gpio || i == sel_group)
28			continue;
29
30		for (j = 0; j < group->num_pins; j++) {
31			if (group->pins[j] == pin) {
32				/* We have found a group using the pin */
33				debug("pinmux: disabling %s\n", group->name);
34				addr = priv->reg_mux + pmx_data->reg * 4;
35				writel(readl(addr) & ~BIT(pmx_data->bit), addr);
36			}
37		}
38	}
39}
40
41static int meson_gx_pinmux_group_set(struct udevice *dev,
42				     unsigned int group_selector,
43				     unsigned int func_selector)
44{
45	struct meson_pinctrl *priv = dev_get_priv(dev);
46	const struct meson_pmx_group *group;
47	const struct meson_pmx_func *func;
48	struct meson_gx_pmx_data *pmx_data;
49	void __iomem *addr;
50	int i;
51
52	group = &priv->data->groups[group_selector];
53	pmx_data = (struct meson_gx_pmx_data *)group->data;
54	func = &priv->data->funcs[func_selector];
55
56	debug("pinmux: set group %s func %s\n", group->name, func->name);
57
58	/*
59	 * Disable groups using the same pins.
60	 * The selected group is not disabled to avoid glitches.
61	 */
62	for (i = 0; i < group->num_pins; i++) {
63		meson_gx_pinmux_disable_other_groups(priv,
64						     group->pins[i],
65						     group_selector);
66	}
67
68	/* Function 0 (GPIO) doesn't need any additional setting */
69	if (func_selector) {
70		addr = priv->reg_mux + pmx_data->reg * 4;
71		writel(readl(addr) | BIT(pmx_data->bit), addr);
72	}
73
74	return 0;
75}
76
77static int meson_gx_pinmux_get(struct udevice *dev,
78				      unsigned int selector,
79				      char *buf, int size)
80{
81	struct meson_pinctrl *priv = dev_get_priv(dev);
82	struct meson_pmx_group *group;
83	struct meson_gx_pmx_data *pmx_data;
84	void __iomem *addr;
85	int i, j, pos = 0;
86	unsigned int pin;
87	u32 reg;
88
89	pin = selector + priv->data->pin_base;
90
91	for (i = 0; i < priv->data->num_groups; i++) {
92		group = &priv->data->groups[i];
93		pmx_data = (struct meson_gx_pmx_data *)group->data;
94		if (pmx_data->is_gpio)
95			continue;
96
97		for (j = 0; j < group->num_pins; j++) {
98			if (group->pins[j] == pin) {
99				/* We have found a group using the pin */
100				addr = priv->reg_mux + pmx_data->reg * 4;
101				reg = readl(addr) & BIT(pmx_data->bit);
102				if (reg) {
103					pos += snprintf(buf + pos, size - pos,
104							"%s ", group->name) - 1;
105					return 0;
106				}
107			}
108		}
109	}
110
111	/* Fallback, must be used as GPIO */
112	snprintf(buf, size, "%s or Unknown",
113		 priv->data->groups[selector].name);
114
115	return 0;
116}
117
118const struct pinconf_param meson_gx_pinconf_params[] = {
119	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
120	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
121	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
122};
123
124const struct pinctrl_ops meson_gx_pinctrl_ops = {
125	.get_groups_count = meson_pinctrl_get_groups_count,
126	.get_group_name = meson_pinctrl_get_group_name,
127	.get_functions_count = meson_pinmux_get_functions_count,
128	.get_function_name = meson_pinmux_get_function_name,
129	.pinmux_group_set = meson_gx_pinmux_group_set,
130	.set_state = pinctrl_generic_set_state,
131	.pinconf_params = meson_gx_pinconf_params,
132	.pinconf_num_params = ARRAY_SIZE(meson_gx_pinconf_params),
133	.pinconf_set = meson_pinconf_set,
134	.pinconf_group_set = meson_pinconf_group_set,
135	.get_pin_name = meson_pinctrl_get_pin_name,
136	.get_pins_count = meson_pinctrl_get_pins_count,
137	.get_pin_muxing	= meson_gx_pinmux_get,
138};
139
140static const struct dm_gpio_ops meson_gx_gpio_ops = {
141	.set_value = meson_gpio_set,
142	.get_value = meson_gpio_get,
143	.get_function = meson_gpio_get_direction,
144	.direction_input = meson_gpio_direction_input,
145	.direction_output = meson_gpio_direction_output,
146};
147
148U_BOOT_DRIVER(meson_gx_gpio_driver) = {
149	.name	= "meson-gx-gpio",
150	.id	= UCLASS_GPIO,
151	.probe	= meson_gpio_probe,
152	.ops	= &meson_gx_gpio_ops,
153};
154