Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2
3#include <linux/acpi.h>
4#include <linux/bitops.h>
5#include <linux/device.h>
6#include <linux/gpio/driver.h>
7#include <linux/gpio/generic.h>
8#include <linux/io.h>
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/pm.h>
13#include <linux/resource.h>
14#include <linux/types.h>
15
16/* Number of pins on BlueField */
17#define MLXBF_GPIO_NR 54
18
19/* Pad Electrical Controls. */
20#define MLXBF_GPIO_PAD_CONTROL_FIRST_WORD 0x0700
21#define MLXBF_GPIO_PAD_CONTROL_1_FIRST_WORD 0x0708
22#define MLXBF_GPIO_PAD_CONTROL_2_FIRST_WORD 0x0710
23#define MLXBF_GPIO_PAD_CONTROL_3_FIRST_WORD 0x0718
24
25#define MLXBF_GPIO_PIN_DIR_I 0x1040
26#define MLXBF_GPIO_PIN_DIR_O 0x1048
27#define MLXBF_GPIO_PIN_STATE 0x1000
28#define MLXBF_GPIO_SCRATCHPAD 0x20
29
30#ifdef CONFIG_PM
31struct mlxbf_gpio_context_save_regs {
32 u64 scratchpad;
33 u64 pad_control[MLXBF_GPIO_NR];
34 u64 pin_dir_i;
35 u64 pin_dir_o;
36};
37#endif
38
39/* Device state structure. */
40struct mlxbf_gpio_state {
41 struct gpio_generic_chip chip;
42
43 /* Memory Address */
44 void __iomem *base;
45
46#ifdef CONFIG_PM
47 struct mlxbf_gpio_context_save_regs csave_regs;
48#endif
49};
50
51static int mlxbf_gpio_probe(struct platform_device *pdev)
52{
53 struct gpio_generic_chip_config config;
54 struct mlxbf_gpio_state *gs;
55 struct device *dev = &pdev->dev;
56 struct gpio_chip *gc;
57 int ret;
58
59 gs = devm_kzalloc(&pdev->dev, sizeof(*gs), GFP_KERNEL);
60 if (!gs)
61 return -ENOMEM;
62
63 gs->base = devm_platform_ioremap_resource(pdev, 0);
64 if (IS_ERR(gs->base))
65 return PTR_ERR(gs->base);
66
67 gc = &gs->chip.gc;
68
69 config = (struct gpio_generic_chip_config) {
70 .dev = dev,
71 .sz = 8,
72 .dat = gs->base + MLXBF_GPIO_PIN_STATE,
73 .dirout = gs->base + MLXBF_GPIO_PIN_DIR_O,
74 .dirin = gs->base + MLXBF_GPIO_PIN_DIR_I,
75 };
76
77 ret = gpio_generic_chip_init(&gs->chip, &config);
78 if (ret)
79 return -ENODEV;
80
81 gc->owner = THIS_MODULE;
82 gc->ngpio = MLXBF_GPIO_NR;
83
84 ret = devm_gpiochip_add_data(dev, &gs->chip.gc, gs);
85 if (ret) {
86 dev_err(&pdev->dev, "Failed adding memory mapped gpiochip\n");
87 return ret;
88 }
89
90 platform_set_drvdata(pdev, gs);
91 dev_info(&pdev->dev, "registered Mellanox BlueField GPIO");
92 return 0;
93}
94
95#ifdef CONFIG_PM
96static int mlxbf_gpio_suspend(struct platform_device *pdev, pm_message_t state)
97{
98 struct mlxbf_gpio_state *gs = platform_get_drvdata(pdev);
99
100 gs->csave_regs.scratchpad = readq(gs->base + MLXBF_GPIO_SCRATCHPAD);
101 gs->csave_regs.pad_control[0] =
102 readq(gs->base + MLXBF_GPIO_PAD_CONTROL_FIRST_WORD);
103 gs->csave_regs.pad_control[1] =
104 readq(gs->base + MLXBF_GPIO_PAD_CONTROL_1_FIRST_WORD);
105 gs->csave_regs.pad_control[2] =
106 readq(gs->base + MLXBF_GPIO_PAD_CONTROL_2_FIRST_WORD);
107 gs->csave_regs.pad_control[3] =
108 readq(gs->base + MLXBF_GPIO_PAD_CONTROL_3_FIRST_WORD);
109 gs->csave_regs.pin_dir_i = readq(gs->base + MLXBF_GPIO_PIN_DIR_I);
110 gs->csave_regs.pin_dir_o = readq(gs->base + MLXBF_GPIO_PIN_DIR_O);
111
112 return 0;
113}
114
115static int mlxbf_gpio_resume(struct platform_device *pdev)
116{
117 struct mlxbf_gpio_state *gs = platform_get_drvdata(pdev);
118
119 writeq(gs->csave_regs.scratchpad, gs->base + MLXBF_GPIO_SCRATCHPAD);
120 writeq(gs->csave_regs.pad_control[0],
121 gs->base + MLXBF_GPIO_PAD_CONTROL_FIRST_WORD);
122 writeq(gs->csave_regs.pad_control[1],
123 gs->base + MLXBF_GPIO_PAD_CONTROL_1_FIRST_WORD);
124 writeq(gs->csave_regs.pad_control[2],
125 gs->base + MLXBF_GPIO_PAD_CONTROL_2_FIRST_WORD);
126 writeq(gs->csave_regs.pad_control[3],
127 gs->base + MLXBF_GPIO_PAD_CONTROL_3_FIRST_WORD);
128 writeq(gs->csave_regs.pin_dir_i, gs->base + MLXBF_GPIO_PIN_DIR_I);
129 writeq(gs->csave_regs.pin_dir_o, gs->base + MLXBF_GPIO_PIN_DIR_O);
130
131 return 0;
132}
133#endif
134
135static const struct acpi_device_id __maybe_unused mlxbf_gpio_acpi_match[] = {
136 { "MLNXBF02", 0 },
137 {}
138};
139MODULE_DEVICE_TABLE(acpi, mlxbf_gpio_acpi_match);
140
141static struct platform_driver mlxbf_gpio_driver = {
142 .driver = {
143 .name = "mlxbf_gpio",
144 .acpi_match_table = ACPI_PTR(mlxbf_gpio_acpi_match),
145 },
146 .probe = mlxbf_gpio_probe,
147#ifdef CONFIG_PM
148 .suspend = mlxbf_gpio_suspend,
149 .resume = mlxbf_gpio_resume,
150#endif
151};
152
153module_platform_driver(mlxbf_gpio_driver);
154
155MODULE_DESCRIPTION("Mellanox BlueField GPIO Driver");
156MODULE_AUTHOR("Mellanox Technologies");
157MODULE_LICENSE("GPL");