1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright 2017 Google, Inc
4 */
5
6 #include <common.h>
7 #include <dm.h>
8 #include <errno.h>
9 #include <log.h>
10 #include <asm/io.h>
11 #include <asm/arch/pinctrl.h>
12 #include <asm/arch/scu_ast2500.h>
13 #include <dm/pinctrl.h>
14
15 /*
16 * This driver works with very simple configuration that has the same name
17 * for group and function. This way it is compatible with the Linux Kernel
18 * driver.
19 */
20
21 struct ast2500_pinctrl_priv {
22 struct ast2500_scu *scu;
23 };
24
ast2500_pinctrl_probe(struct udevice * dev)25 static int ast2500_pinctrl_probe(struct udevice *dev)
26 {
27 struct ast2500_pinctrl_priv *priv = dev_get_priv(dev);
28
29 priv->scu = ast_get_scu();
30
31 return 0;
32 }
33
34 struct ast2500_group_config {
35 char *group_name;
36 /* Control register number (1-10) */
37 unsigned reg_num;
38 /* The mask of control bits in the register */
39 u32 ctrl_bit_mask;
40 };
41
42 static const struct ast2500_group_config ast2500_groups[] = {
43 { "I2C1", 8, (1 << 13) | (1 << 12) },
44 { "I2C2", 8, (1 << 15) | (1 << 14) },
45 { "I2C3", 8, (1 << 16) },
46 { "I2C4", 5, (1 << 17) },
47 { "I2C4", 5, (1 << 17) },
48 { "I2C5", 5, (1 << 18) },
49 { "I2C6", 5, (1 << 19) },
50 { "I2C7", 5, (1 << 20) },
51 { "I2C8", 5, (1 << 21) },
52 { "I2C9", 5, (1 << 22) },
53 { "I2C10", 5, (1 << 23) },
54 { "I2C11", 5, (1 << 24) },
55 { "I2C12", 5, (1 << 25) },
56 { "I2C13", 5, (1 << 26) },
57 { "I2C14", 5, (1 << 27) },
58 { "MAC1LINK", 1, (1 << 0) },
59 { "MDIO1", 3, (1 << 31) | (1 << 30) },
60 { "MAC2LINK", 1, (1 << 1) },
61 { "MDIO2", 5, (1 << 2) },
62 { "SD1", 5, (1 << 0) },
63 { "SD2", 5, (1 << 1) },
64 };
65
ast2500_pinctrl_get_groups_count(struct udevice * dev)66 static int ast2500_pinctrl_get_groups_count(struct udevice *dev)
67 {
68 debug("PINCTRL: get_(functions/groups)_count\n");
69
70 return ARRAY_SIZE(ast2500_groups);
71 }
72
ast2500_pinctrl_get_group_name(struct udevice * dev,unsigned selector)73 static const char *ast2500_pinctrl_get_group_name(struct udevice *dev,
74 unsigned selector)
75 {
76 debug("PINCTRL: get_(function/group)_name %u\n", selector);
77
78 return ast2500_groups[selector].group_name;
79 }
80
ast2500_pinctrl_group_set(struct udevice * dev,unsigned selector,unsigned func_selector)81 static int ast2500_pinctrl_group_set(struct udevice *dev, unsigned selector,
82 unsigned func_selector)
83 {
84 struct ast2500_pinctrl_priv *priv = dev_get_priv(dev);
85 const struct ast2500_group_config *config;
86 u32 *ctrl_reg;
87
88 debug("PINCTRL: group_set <%u, %u>\n", selector, func_selector);
89 if (selector >= ARRAY_SIZE(ast2500_groups))
90 return -EINVAL;
91
92 config = &ast2500_groups[selector];
93 if (config->reg_num > 6)
94 ctrl_reg = &priv->scu->pinmux_ctrl1[config->reg_num - 7];
95 else
96 ctrl_reg = &priv->scu->pinmux_ctrl[config->reg_num - 1];
97
98 ast_scu_unlock(priv->scu);
99 setbits_le32(ctrl_reg, config->ctrl_bit_mask);
100 ast_scu_lock(priv->scu);
101
102 return 0;
103 }
104
105 static struct pinctrl_ops ast2500_pinctrl_ops = {
106 .set_state = pinctrl_generic_set_state,
107 .get_groups_count = ast2500_pinctrl_get_groups_count,
108 .get_group_name = ast2500_pinctrl_get_group_name,
109 .get_functions_count = ast2500_pinctrl_get_groups_count,
110 .get_function_name = ast2500_pinctrl_get_group_name,
111 .pinmux_group_set = ast2500_pinctrl_group_set,
112 };
113
114 static const struct udevice_id ast2500_pinctrl_ids[] = {
115 { .compatible = "aspeed,ast2500-pinctrl" },
116 { .compatible = "aspeed,g5-pinctrl" },
117 { }
118 };
119
120 U_BOOT_DRIVER(pinctrl_ast2500) = {
121 .name = "aspeed_ast2500_pinctrl",
122 .id = UCLASS_PINCTRL,
123 .of_match = ast2500_pinctrl_ids,
124 .priv_auto = sizeof(struct ast2500_pinctrl_priv),
125 .ops = &ast2500_pinctrl_ops,
126 .probe = ast2500_pinctrl_probe,
127 };
128