1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2014 NVIDIA Corporation
4 */
5
6 #include <common.h>
7 #include <dm.h>
8 #include <asm/gpio.h>
9 #include <power/as3722.h>
10 #include <power/pmic.h>
11
12 #define NUM_GPIOS 8
13
as3722_gpio_configure(struct udevice * pmic,unsigned int gpio,unsigned long flags)14 int as3722_gpio_configure(struct udevice *pmic, unsigned int gpio,
15 unsigned long flags)
16 {
17 u8 value = 0;
18 int err;
19
20 if (flags & AS3722_GPIO_OUTPUT_VDDH)
21 value |= AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDH;
22
23 if (flags & AS3722_GPIO_INVERT)
24 value |= AS3722_GPIO_CONTROL_INVERT;
25
26 err = pmic_reg_write(pmic, AS3722_GPIO_CONTROL(gpio), value);
27 if (err) {
28 pr_err("failed to configure GPIO#%u: %d\n", gpio, err);
29 return err;
30 }
31
32 return 0;
33 }
34
as3722_gpio_set_value(struct udevice * dev,unsigned int gpio,int level)35 static int as3722_gpio_set_value(struct udevice *dev, unsigned int gpio,
36 int level)
37 {
38 struct udevice *pmic = dev_get_parent(dev);
39 const char *l;
40 u8 value;
41 int err;
42
43 if (gpio >= NUM_GPIOS)
44 return -EINVAL;
45
46 err = pmic_reg_read(pmic, AS3722_GPIO_SIGNAL_OUT);
47 if (err < 0) {
48 pr_err("failed to read GPIO signal out register: %d\n", err);
49 return err;
50 }
51 value = err;
52
53 if (level == 0) {
54 value &= ~(1 << gpio);
55 l = "low";
56 } else {
57 value |= 1 << gpio;
58 l = "high";
59 }
60
61 err = pmic_reg_write(pmic, AS3722_GPIO_SIGNAL_OUT, value);
62 if (err) {
63 pr_err("failed to set GPIO#%u %s: %d\n", gpio, l, err);
64 return err;
65 }
66
67 return 0;
68 }
69
as3722_gpio_direction_output(struct udevice * dev,unsigned int gpio,int value)70 int as3722_gpio_direction_output(struct udevice *dev, unsigned int gpio,
71 int value)
72 {
73 struct udevice *pmic = dev_get_parent(dev);
74 int err;
75
76 if (gpio > 7)
77 return -EINVAL;
78
79 if (value == 0)
80 value = AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDL;
81 else
82 value = AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDH;
83
84 err = pmic_reg_write(pmic, AS3722_GPIO_CONTROL(gpio), value);
85 if (err) {
86 pr_err("failed to configure GPIO#%u as output: %d\n", gpio,
87 err);
88 return err;
89 }
90
91 err = as3722_gpio_set_value(pmic, gpio, value);
92 if (err < 0) {
93 pr_err("failed to set GPIO#%u high: %d\n", gpio, err);
94 return err;
95 }
96
97 return 0;
98 }
99
as3722_gpio_probe(struct udevice * dev)100 static int as3722_gpio_probe(struct udevice *dev)
101 {
102 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
103
104 uc_priv->gpio_count = NUM_GPIOS;
105 uc_priv->bank_name = "as3722_";
106
107 return 0;
108 }
109
110 static const struct dm_gpio_ops gpio_as3722_ops = {
111 .direction_output = as3722_gpio_direction_output,
112 .set_value = as3722_gpio_set_value,
113 };
114
115 U_BOOT_DRIVER(gpio_as3722) = {
116 .name = "gpio_as3722",
117 .id = UCLASS_GPIO,
118 .ops = &gpio_as3722_ops,
119 .probe = as3722_gpio_probe,
120 };
121