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-only OR BSD-3-Clause
2/* Copyright (C) 2022 NVIDIA CORPORATION & AFFILIATES */
3
4#include <linux/bitfield.h>
5#include <linux/bitops.h>
6#include <linux/device.h>
7#include <linux/err.h>
8#include <linux/gpio/driver.h>
9#include <linux/gpio/generic.h>
10#include <linux/interrupt.h>
11#include <linux/io.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/spinlock.h>
15#include <linux/types.h>
16
17/*
18 * There are 2 YU GPIO blocks:
19 * gpio[0]: HOST_GPIO0->HOST_GPIO31
20 * gpio[1]: HOST_GPIO32->HOST_GPIO55
21 */
22#define MLXBF3_GPIO_MAX_PINS_PER_BLOCK 32
23#define MLXBF3_GPIO_MAX_PINS_BLOCK0 32
24#define MLXBF3_GPIO_MAX_PINS_BLOCK1 24
25
26/*
27 * fw_gpio[x] block registers and their offset
28 */
29#define MLXBF_GPIO_FW_OUTPUT_ENABLE_SET 0x00
30#define MLXBF_GPIO_FW_DATA_OUT_SET 0x04
31
32#define MLXBF_GPIO_FW_OUTPUT_ENABLE_CLEAR 0x00
33#define MLXBF_GPIO_FW_DATA_OUT_CLEAR 0x04
34
35#define MLXBF_GPIO_CAUSE_RISE_EN 0x00
36#define MLXBF_GPIO_CAUSE_FALL_EN 0x04
37#define MLXBF_GPIO_READ_DATA_IN 0x08
38
39#define MLXBF_GPIO_CAUSE_OR_CAUSE_EVTEN0 0x00
40#define MLXBF_GPIO_CAUSE_OR_EVTEN0 0x14
41#define MLXBF_GPIO_CAUSE_OR_CLRCAUSE 0x18
42
43#define MLXBF_GPIO_CLR_ALL_INTS GENMASK(31, 0)
44
45struct mlxbf3_gpio_context {
46 struct gpio_generic_chip chip;
47
48 /* YU GPIO block address */
49 void __iomem *gpio_set_io;
50 void __iomem *gpio_clr_io;
51 void __iomem *gpio_io;
52
53 /* YU GPIO cause block address */
54 void __iomem *gpio_cause_io;
55};
56
57static void mlxbf3_gpio_irq_enable(struct irq_data *irqd)
58{
59 struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
60 struct mlxbf3_gpio_context *gs = gpiochip_get_data(gc);
61 irq_hw_number_t offset = irqd_to_hwirq(irqd);
62 u32 val;
63
64 gpiochip_enable_irq(gc, offset);
65
66 guard(gpio_generic_lock_irqsave)(&gs->chip);
67
68 writel(BIT(offset), gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_CLRCAUSE);
69
70 val = readl(gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_EVTEN0);
71 val |= BIT(offset);
72 writel(val, gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_EVTEN0);
73}
74
75static void mlxbf3_gpio_irq_disable(struct irq_data *irqd)
76{
77 struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
78 struct mlxbf3_gpio_context *gs = gpiochip_get_data(gc);
79 irq_hw_number_t offset = irqd_to_hwirq(irqd);
80 u32 val;
81
82 scoped_guard(gpio_generic_lock_irqsave, &gs->chip) {
83 val = readl(gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_EVTEN0);
84 val &= ~BIT(offset);
85 writel(val, gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_EVTEN0);
86
87 writel(BIT(offset), gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_CLRCAUSE);
88 }
89
90 gpiochip_disable_irq(gc, offset);
91}
92
93static irqreturn_t mlxbf3_gpio_irq_handler(int irq, void *ptr)
94{
95 struct mlxbf3_gpio_context *gs = ptr;
96 struct gpio_chip *gc = &gs->chip.gc;
97 unsigned long pending;
98 u32 level;
99
100 pending = readl(gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_CAUSE_EVTEN0);
101 writel(pending, gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_CLRCAUSE);
102
103 for_each_set_bit(level, &pending, gc->ngpio)
104 generic_handle_domain_irq(gc->irq.domain, level);
105
106 return IRQ_RETVAL(pending);
107}
108
109static int
110mlxbf3_gpio_irq_set_type(struct irq_data *irqd, unsigned int type)
111{
112 struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
113 struct mlxbf3_gpio_context *gs = gpiochip_get_data(gc);
114 irq_hw_number_t offset = irqd_to_hwirq(irqd);
115 u32 val;
116
117 scoped_guard(gpio_generic_lock_irqsave, &gs->chip) {
118 switch (type & IRQ_TYPE_SENSE_MASK) {
119 case IRQ_TYPE_EDGE_BOTH:
120 val = readl(gs->gpio_io + MLXBF_GPIO_CAUSE_FALL_EN);
121 val |= BIT(offset);
122 writel(val, gs->gpio_io + MLXBF_GPIO_CAUSE_FALL_EN);
123 val = readl(gs->gpio_io + MLXBF_GPIO_CAUSE_RISE_EN);
124 val |= BIT(offset);
125 writel(val, gs->gpio_io + MLXBF_GPIO_CAUSE_RISE_EN);
126 break;
127 case IRQ_TYPE_EDGE_RISING:
128 val = readl(gs->gpio_io + MLXBF_GPIO_CAUSE_RISE_EN);
129 val |= BIT(offset);
130 writel(val, gs->gpio_io + MLXBF_GPIO_CAUSE_RISE_EN);
131 break;
132 case IRQ_TYPE_EDGE_FALLING:
133 val = readl(gs->gpio_io + MLXBF_GPIO_CAUSE_FALL_EN);
134 val |= BIT(offset);
135 writel(val, gs->gpio_io + MLXBF_GPIO_CAUSE_FALL_EN);
136 break;
137 default:
138 return -EINVAL;
139 }
140 }
141
142 irq_set_handler_locked(irqd, handle_edge_irq);
143
144 return 0;
145}
146
147/* This function needs to be defined for handle_edge_irq() */
148static void mlxbf3_gpio_irq_ack(struct irq_data *data)
149{
150}
151
152static const struct irq_chip gpio_mlxbf3_irqchip = {
153 .name = "MLNXBF33",
154 .irq_ack = mlxbf3_gpio_irq_ack,
155 .irq_set_type = mlxbf3_gpio_irq_set_type,
156 .irq_enable = mlxbf3_gpio_irq_enable,
157 .irq_disable = mlxbf3_gpio_irq_disable,
158 .flags = IRQCHIP_IMMUTABLE,
159 GPIOCHIP_IRQ_RESOURCE_HELPERS,
160};
161
162static int mlxbf3_gpio_add_pin_ranges(struct gpio_chip *chip)
163{
164 unsigned int id;
165
166 switch(chip->ngpio) {
167 case MLXBF3_GPIO_MAX_PINS_BLOCK0:
168 id = 0;
169 break;
170 case MLXBF3_GPIO_MAX_PINS_BLOCK1:
171 id = 1;
172 break;
173 default:
174 return -EINVAL;
175 }
176
177 return gpiochip_add_pin_range(chip, "MLNXBF34:00",
178 chip->base, id * MLXBF3_GPIO_MAX_PINS_PER_BLOCK,
179 chip->ngpio);
180}
181
182static int mlxbf3_gpio_probe(struct platform_device *pdev)
183{
184 struct gpio_generic_chip_config config;
185 struct device *dev = &pdev->dev;
186 struct mlxbf3_gpio_context *gs;
187 struct gpio_irq_chip *girq;
188 struct gpio_chip *gc;
189 int ret, irq;
190
191 gs = devm_kzalloc(dev, sizeof(*gs), GFP_KERNEL);
192 if (!gs)
193 return -ENOMEM;
194
195 gs->gpio_io = devm_platform_ioremap_resource(pdev, 0);
196 if (IS_ERR(gs->gpio_io))
197 return PTR_ERR(gs->gpio_io);
198
199 gs->gpio_cause_io = devm_platform_ioremap_resource(pdev, 1);
200 if (IS_ERR(gs->gpio_cause_io))
201 return PTR_ERR(gs->gpio_cause_io);
202
203 gs->gpio_set_io = devm_platform_ioremap_resource(pdev, 2);
204 if (IS_ERR(gs->gpio_set_io))
205 return PTR_ERR(gs->gpio_set_io);
206
207 gs->gpio_clr_io = devm_platform_ioremap_resource(pdev, 3);
208 if (IS_ERR(gs->gpio_clr_io))
209 return PTR_ERR(gs->gpio_clr_io);
210 gc = &gs->chip.gc;
211
212 config = (struct gpio_generic_chip_config) {
213 .dev = dev,
214 .sz = 4,
215 .dat = gs->gpio_io + MLXBF_GPIO_READ_DATA_IN,
216 .set = gs->gpio_set_io + MLXBF_GPIO_FW_DATA_OUT_SET,
217 .clr = gs->gpio_clr_io + MLXBF_GPIO_FW_DATA_OUT_CLEAR,
218 .dirout = gs->gpio_set_io + MLXBF_GPIO_FW_OUTPUT_ENABLE_SET,
219 .dirin = gs->gpio_clr_io + MLXBF_GPIO_FW_OUTPUT_ENABLE_CLEAR,
220 };
221
222 ret = gpio_generic_chip_init(&gs->chip, &config);
223 if (ret)
224 return dev_err_probe(dev, ret,
225 "%s: failed to initialize the generic GPIO chip",
226 __func__);
227
228 gc->request = gpiochip_generic_request;
229 gc->free = gpiochip_generic_free;
230 gc->owner = THIS_MODULE;
231 gc->add_pin_ranges = mlxbf3_gpio_add_pin_ranges;
232
233 irq = platform_get_irq_optional(pdev, 0);
234 if (irq >= 0) {
235 girq = &gs->chip.gc.irq;
236 gpio_irq_chip_set_chip(girq, &gpio_mlxbf3_irqchip);
237 girq->default_type = IRQ_TYPE_NONE;
238 /* This will let us handle the parent IRQ in the driver */
239 girq->num_parents = 0;
240 girq->parents = NULL;
241 girq->parent_handler = NULL;
242 girq->handler = handle_bad_irq;
243
244 /*
245 * Directly request the irq here instead of passing
246 * a flow-handler because the irq is shared.
247 */
248 ret = devm_request_irq(dev, irq, mlxbf3_gpio_irq_handler,
249 IRQF_SHARED, dev_name(dev), gs);
250 if (ret)
251 return dev_err_probe(dev, ret, "failed to request IRQ");
252 }
253
254 platform_set_drvdata(pdev, gs);
255
256 ret = devm_gpiochip_add_data(dev, gc, gs);
257 if (ret)
258 dev_err_probe(dev, ret, "Failed adding memory mapped gpiochip\n");
259
260 return 0;
261}
262
263static void mlxbf3_gpio_shutdown(struct platform_device *pdev)
264{
265 struct mlxbf3_gpio_context *gs = platform_get_drvdata(pdev);
266
267 /* Disable and clear all interrupts */
268 writel(0, gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_EVTEN0);
269 writel(MLXBF_GPIO_CLR_ALL_INTS, gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_CLRCAUSE);
270}
271
272static const struct acpi_device_id mlxbf3_gpio_acpi_match[] = {
273 { "MLNXBF33", 0 },
274 {}
275};
276MODULE_DEVICE_TABLE(acpi, mlxbf3_gpio_acpi_match);
277
278static struct platform_driver mlxbf3_gpio_driver = {
279 .driver = {
280 .name = "mlxbf3_gpio",
281 .acpi_match_table = mlxbf3_gpio_acpi_match,
282 },
283 .probe = mlxbf3_gpio_probe,
284 .shutdown = mlxbf3_gpio_shutdown,
285};
286module_platform_driver(mlxbf3_gpio_driver);
287
288MODULE_SOFTDEP("pre: pinctrl-mlxbf3");
289MODULE_DESCRIPTION("NVIDIA BlueField-3 GPIO Driver");
290MODULE_AUTHOR("Asmaa Mnebhi <asmaa@nvidia.com>");
291MODULE_LICENSE("Dual BSD/GPL");