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
meson_gx_pinmux_disable_other_groups(struct meson_pinctrl * priv,unsigned int pin,int sel_group)15 static 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
meson_gx_pinmux_group_set(struct udevice * dev,unsigned int group_selector,unsigned int func_selector)41 static 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
meson_gx_pinmux_get(struct udevice * dev,unsigned int selector,char * buf,int size)77 static 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
118 const 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
124 const 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
140 static 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
148 const struct 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