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677b5358 BG |
1 | /* |
2 | * (C) Copyright 2016 - Beniamino Galvani <b.galvani@gmail.com> | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0+ | |
5 | */ | |
6 | ||
7 | #include <common.h> | |
8 | #include <dm/device.h> | |
9 | #include <dm/pinctrl.h> | |
10 | #include <fdt_support.h> | |
11 | #include <linux/err.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/sizes.h> | |
14 | ||
15 | #include "pinctrl-meson.h" | |
16 | ||
17 | DECLARE_GLOBAL_DATA_PTR; | |
18 | ||
19 | static const char *meson_pinctrl_dummy_name = "_dummy"; | |
20 | ||
21 | static int meson_pinctrl_get_groups_count(struct udevice *dev) | |
22 | { | |
23 | struct meson_pinctrl *priv = dev_get_priv(dev); | |
24 | ||
25 | return priv->data->num_groups; | |
26 | } | |
27 | ||
28 | static const char *meson_pinctrl_get_group_name(struct udevice *dev, | |
29 | unsigned selector) | |
30 | { | |
31 | struct meson_pinctrl *priv = dev_get_priv(dev); | |
32 | ||
33 | if (!priv->data->groups[selector].name) | |
34 | return meson_pinctrl_dummy_name; | |
35 | ||
36 | return priv->data->groups[selector].name; | |
37 | } | |
38 | ||
39 | static int meson_pinmux_get_functions_count(struct udevice *dev) | |
40 | { | |
41 | struct meson_pinctrl *priv = dev_get_priv(dev); | |
42 | ||
43 | return priv->data->num_funcs; | |
44 | } | |
45 | ||
46 | static const char *meson_pinmux_get_function_name(struct udevice *dev, | |
47 | unsigned selector) | |
48 | { | |
49 | struct meson_pinctrl *priv = dev_get_priv(dev); | |
50 | ||
51 | return priv->data->funcs[selector].name; | |
52 | } | |
53 | ||
54 | static void meson_pinmux_disable_other_groups(struct meson_pinctrl *priv, | |
55 | unsigned int pin, int sel_group) | |
56 | { | |
57 | struct meson_pmx_group *group; | |
58 | void __iomem *addr; | |
59 | int i, j; | |
60 | ||
61 | for (i = 0; i < priv->data->num_groups; i++) { | |
62 | group = &priv->data->groups[i]; | |
63 | if (group->is_gpio || i == sel_group) | |
64 | continue; | |
65 | ||
66 | for (j = 0; j < group->num_pins; j++) { | |
67 | if (group->pins[j] == pin) { | |
68 | /* We have found a group using the pin */ | |
69 | debug("pinmux: disabling %s\n", group->name); | |
70 | addr = priv->reg_mux + group->reg * 4; | |
71 | writel(readl(addr) & ~BIT(group->bit), addr); | |
72 | } | |
73 | } | |
74 | } | |
75 | } | |
76 | ||
77 | static int meson_pinmux_group_set(struct udevice *dev, | |
78 | unsigned group_selector, | |
79 | unsigned func_selector) | |
80 | { | |
81 | struct meson_pinctrl *priv = dev_get_priv(dev); | |
82 | const struct meson_pmx_group *group; | |
83 | const struct meson_pmx_func *func; | |
84 | void __iomem *addr; | |
85 | int i; | |
86 | ||
87 | group = &priv->data->groups[group_selector]; | |
88 | func = &priv->data->funcs[func_selector]; | |
89 | ||
90 | debug("pinmux: set group %s func %s\n", group->name, func->name); | |
91 | ||
92 | /* | |
93 | * Disable groups using the same pins. | |
94 | * The selected group is not disabled to avoid glitches. | |
95 | */ | |
96 | for (i = 0; i < group->num_pins; i++) { | |
97 | meson_pinmux_disable_other_groups(priv, | |
98 | group->pins[i], | |
99 | group_selector); | |
100 | } | |
101 | ||
102 | /* Function 0 (GPIO) doesn't need any additional setting */ | |
103 | if (func_selector) { | |
104 | addr = priv->reg_mux + group->reg * 4; | |
105 | writel(readl(addr) | BIT(group->bit), addr); | |
106 | } | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | const struct pinctrl_ops meson_pinctrl_ops = { | |
112 | .get_groups_count = meson_pinctrl_get_groups_count, | |
113 | .get_group_name = meson_pinctrl_get_group_name, | |
114 | .get_functions_count = meson_pinmux_get_functions_count, | |
115 | .get_function_name = meson_pinmux_get_function_name, | |
116 | .pinmux_group_set = meson_pinmux_group_set, | |
117 | .set_state = pinctrl_generic_set_state, | |
118 | }; | |
119 | ||
120 | static fdt_addr_t parse_address(int offset, const char *name, int na, int ns) | |
121 | { | |
122 | int index, len = 0; | |
123 | const fdt32_t *reg; | |
124 | ||
b02e4044 | 125 | index = fdt_stringlist_search(gd->fdt_blob, offset, "reg-names", name); |
677b5358 BG |
126 | if (index < 0) |
127 | return FDT_ADDR_T_NONE; | |
128 | ||
129 | reg = fdt_getprop(gd->fdt_blob, offset, "reg", &len); | |
130 | if (!reg || (len <= (index * sizeof(fdt32_t) * (na + ns)))) | |
131 | return FDT_ADDR_T_NONE; | |
132 | ||
133 | reg += index * (na + ns); | |
134 | ||
135 | return fdt_translate_address((void *)gd->fdt_blob, offset, reg); | |
136 | } | |
137 | ||
138 | int meson_pinctrl_probe(struct udevice *dev) | |
139 | { | |
140 | struct meson_pinctrl *priv = dev_get_priv(dev); | |
141 | fdt_addr_t addr; | |
142 | int node, gpio = -1, len; | |
143 | int na, ns; | |
144 | ||
145 | na = fdt_address_cells(gd->fdt_blob, dev->parent->of_offset); | |
146 | if (na < 1) { | |
147 | debug("bad #address-cells\n"); | |
148 | return -EINVAL; | |
149 | } | |
150 | ||
151 | ns = fdt_size_cells(gd->fdt_blob, dev->parent->of_offset); | |
152 | if (ns < 1) { | |
153 | debug("bad #size-cells\n"); | |
154 | return -EINVAL; | |
155 | } | |
156 | ||
df87e6b1 | 157 | fdt_for_each_subnode(node, gd->fdt_blob, dev->of_offset) { |
677b5358 BG |
158 | if (fdt_getprop(gd->fdt_blob, node, "gpio-controller", &len)) { |
159 | gpio = node; | |
160 | break; | |
161 | } | |
162 | } | |
163 | ||
164 | if (!gpio) { | |
165 | debug("gpio node not found\n"); | |
166 | return -EINVAL; | |
167 | } | |
168 | ||
169 | addr = parse_address(gpio, "mux", na, ns); | |
170 | if (addr == FDT_ADDR_T_NONE) { | |
171 | debug("mux not found\n"); | |
172 | return -EINVAL; | |
173 | } | |
174 | ||
175 | priv->reg_mux = (void __iomem *)addr; | |
176 | priv->data = (struct meson_pinctrl_data *)dev_get_driver_data(dev); | |
177 | ||
178 | return 0; | |
179 | } |