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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / b340199f828e7d57945785b698ff97469972d1ca / . / drivers / gpio / zynqmp_gpio_modepin.c
blob: 078fd833959a09cd30d21df3ad503460d8dee910 [file] [log] [blame]
T Karthik Reddy3b441cf2021-10-29 13:11:43 +0200[diff] [blame]1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ZynqMP GPIO modepin driver
4 *
5 * Copyright (C) 2021 Xilinx, Inc.
6 */
7
8#include <common.h>
9#include <errno.h>
10#include <asm/io.h>
11#include <asm/gpio.h>
12#include <dm.h>
13#include <asm/arch/hardware.h>
14#include <zynqmp_firmware.h>
15
16#define OUTEN(pin) (BIT(0) << (pin))
17#define INVAL(pin) (BIT(4) << (pin))
18#define OUTVAL(pin) (BIT(8) << (pin))
19
20#define ZYNQMP_CRL_APB_BOOTPIN_CTRL_MASK 0xF0F
21#define ZYNQMP_CRL_APB_BOOT_PIN_CTRL (ZYNQMP_CRL_APB_BASEADDR + \
22 (0x250U))
23
24static int get_gpio_modepin(u32 *ret_payload)
25{
26 return xilinx_pm_request(PM_MMIO_READ, ZYNQMP_CRL_APB_BOOT_PIN_CTRL,
27 0, 0, 0, ret_payload);
28}
29
30static int set_gpio_modepin(int val)
31{
32 return xilinx_pm_request(PM_MMIO_WRITE, ZYNQMP_CRL_APB_BOOT_PIN_CTRL,
33 ZYNQMP_CRL_APB_BOOTPIN_CTRL_MASK,
34 val, 0, NULL);
35}
36
37static int modepin_gpio_direction_input(struct udevice *dev,
38 unsigned int offset)
39{
40 return 0;
41}
42
43static int modepin_gpio_set_value(struct udevice *dev, unsigned int offset,
44 int value)
45{
46 u32 ret_payload[PAYLOAD_ARG_CNT];
47 u32 out_val = 0;
48 int ret;
49
50 ret = get_gpio_modepin(ret_payload);
51 if (value)
52 out_val = OUTVAL(offset) | ret_payload[1];
53 else
54 out_val = ~OUTVAL(offset) & ret_payload[1];
55
56 return set_gpio_modepin(out_val);
57}
58
59static int modepin_gpio_direction_output(struct udevice *dev,
60 unsigned int offset, int value)
61{
62 u32 ret_payload[PAYLOAD_ARG_CNT];
63 u32 out_en = 0;
64 int ret;
65
66 ret = get_gpio_modepin(ret_payload);
67 if (ret)
68 return ret;
69
70 if (value)
71 out_en = OUTEN(offset) | ret_payload[1];
72 else
73 out_en = ~OUTEN(offset) & ret_payload[1];
74
75 ret = set_gpio_modepin(out_en);
76 if (ret)
77 return ret;
78
79 return modepin_gpio_set_value(dev, offset, value);
80}
81
82static int modepin_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
83 struct ofnode_phandle_args *args)
84{
85 desc->offset = args->args[0];
86
87 return 0;
88}
89
90static int modepin_gpio_get_value(struct udevice *dev, unsigned int offset)
91{
92 u32 ret_payload[PAYLOAD_ARG_CNT];
93 int ret;
94
95 ret = get_gpio_modepin(ret_payload);
96 if (ret)
97 return ret;
98
99 return (INVAL(offset) & ret_payload[1]) ? 1 : 0;
100}
101
102static int modepin_gpio_get_function(struct udevice *dev, unsigned int offset)
103{
104 u32 ret_payload[PAYLOAD_ARG_CNT];
105 int ret;
106
107 ret = get_gpio_modepin(ret_payload);
108 if (ret)
109 return ret;
110
111 return (OUTEN(offset) & ret_payload[1]) ? GPIOF_OUTPUT : GPIOF_INPUT;
112}
113
114static const struct dm_gpio_ops modepin_gpio_ops = {
115 .direction_input = modepin_gpio_direction_input,
116 .direction_output = modepin_gpio_direction_output,
117 .get_value = modepin_gpio_get_value,
118 .set_value = modepin_gpio_set_value,
119 .get_function = modepin_gpio_get_function,
120 .xlate = modepin_gpio_xlate,
121};
122
123static int modepin_gpio_probe(struct udevice *dev)
124{
125 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
126 const void *label_ptr;
127
128 label_ptr = dev_read_prop(dev, "label", NULL);
129 if (label_ptr) {
130 uc_priv->bank_name = strdup(label_ptr);
131 if (!uc_priv->bank_name)
132 return -ENOMEM;
133 } else {
134 uc_priv->bank_name = dev->name;
135 }
136
137 uc_priv->gpio_count = 4;
138
139 return 0;
140}
141
142static const struct udevice_id modepin_gpio_ids[] = {
143 { .compatible = "xlnx,zynqmp-gpio-modepin",},
144 { }
145};
146
147U_BOOT_DRIVER(modepin_gpio) = {
148 .name = "modepin_gpio",
149 .id = UCLASS_GPIO,
150 .ops = &modepin_gpio_ops,
151 .of_match = modepin_gpio_ids,
152 .probe = modepin_gpio_probe,
153};