1 /*
2 * Copyright (C) 2014 NVIDIA Corporation
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <asm/gpio.h>
10 #include <power/as3722.h>
11 #include <power/pmic.h>
12
13 #define NUM_GPIOS 8
14
as3722_gpio_configure(struct udevice * pmic,unsigned int gpio,unsigned long flags)15 int as3722_gpio_configure(struct udevice *pmic, unsigned int gpio,
16 unsigned long flags)
17 {
18 u8 value = 0;
19 int err;
20
21 if (flags & AS3722_GPIO_OUTPUT_VDDH)
22 value |= AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDH;
23
24 if (flags & AS3722_GPIO_INVERT)
25 value |= AS3722_GPIO_CONTROL_INVERT;
26
27 err = pmic_reg_write(pmic, AS3722_GPIO_CONTROL(gpio), value);
28 if (err) {
29 pr_err("failed to configure GPIO#%u: %d", gpio, err);
30 return err;
31 }
32
33 return 0;
34 }
35
as3722_gpio_set_value(struct udevice * dev,unsigned int gpio,int level)36 static int as3722_gpio_set_value(struct udevice *dev, unsigned int gpio,
37 int level)
38 {
39 struct udevice *pmic = dev_get_parent(dev);
40 const char *l;
41 u8 value;
42 int err;
43
44 if (gpio >= NUM_GPIOS)
45 return -EINVAL;
46
47 err = pmic_reg_read(pmic, AS3722_GPIO_SIGNAL_OUT);
48 if (err < 0) {
49 pr_err("failed to read GPIO signal out register: %d", err);
50 return err;
51 }
52 value = err;
53
54 if (level == 0) {
55 value &= ~(1 << gpio);
56 l = "low";
57 } else {
58 value |= 1 << gpio;
59 l = "high";
60 }
61
62 err = pmic_reg_write(pmic, AS3722_GPIO_SIGNAL_OUT, value);
63 if (err) {
64 pr_err("failed to set GPIO#%u %s: %d", gpio, l, err);
65 return err;
66 }
67
68 return 0;
69 }
70
as3722_gpio_direction_output(struct udevice * dev,unsigned int gpio,int value)71 int as3722_gpio_direction_output(struct udevice *dev, unsigned int gpio,
72 int value)
73 {
74 struct udevice *pmic = dev_get_parent(dev);
75 int err;
76
77 if (gpio > 7)
78 return -EINVAL;
79
80 if (value == 0)
81 value = AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDL;
82 else
83 value = AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDH;
84
85 err = pmic_reg_write(pmic, AS3722_GPIO_CONTROL(gpio), value);
86 if (err) {
87 pr_err("failed to configure GPIO#%u as output: %d", gpio, 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", 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