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96868dce YS |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (C) 2019 SiFive | |
4 | */ | |
5 | ||
6 | #include <linux/bitops.h> | |
7 | #include <linux/device.h> | |
8 | #include <linux/errno.h> | |
9 | #include <linux/of_irq.h> | |
10 | #include <linux/gpio/driver.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/regmap.h> | |
16 | ||
17 | #define SIFIVE_GPIO_INPUT_VAL 0x00 | |
18 | #define SIFIVE_GPIO_INPUT_EN 0x04 | |
19 | #define SIFIVE_GPIO_OUTPUT_EN 0x08 | |
20 | #define SIFIVE_GPIO_OUTPUT_VAL 0x0C | |
21 | #define SIFIVE_GPIO_RISE_IE 0x18 | |
22 | #define SIFIVE_GPIO_RISE_IP 0x1C | |
23 | #define SIFIVE_GPIO_FALL_IE 0x20 | |
24 | #define SIFIVE_GPIO_FALL_IP 0x24 | |
25 | #define SIFIVE_GPIO_HIGH_IE 0x28 | |
26 | #define SIFIVE_GPIO_HIGH_IP 0x2C | |
27 | #define SIFIVE_GPIO_LOW_IE 0x30 | |
28 | #define SIFIVE_GPIO_LOW_IP 0x34 | |
29 | #define SIFIVE_GPIO_OUTPUT_XOR 0x40 | |
30 | ||
31 | #define SIFIVE_GPIO_MAX 32 | |
96868dce YS |
32 | |
33 | struct sifive_gpio { | |
34 | void __iomem *base; | |
35 | struct gpio_chip gc; | |
36 | struct regmap *regs; | |
a924eae7 | 37 | unsigned long irq_state; |
96868dce | 38 | unsigned int trigger[SIFIVE_GPIO_MAX]; |
f52d6d8b | 39 | unsigned int irq_number[SIFIVE_GPIO_MAX]; |
96868dce YS |
40 | }; |
41 | ||
42 | static void sifive_gpio_set_ie(struct sifive_gpio *chip, unsigned int offset) | |
43 | { | |
44 | unsigned long flags; | |
45 | unsigned int trigger; | |
46 | ||
3c938cc5 | 47 | raw_spin_lock_irqsave(&chip->gc.bgpio_lock, flags); |
96868dce YS |
48 | trigger = (chip->irq_state & BIT(offset)) ? chip->trigger[offset] : 0; |
49 | regmap_update_bits(chip->regs, SIFIVE_GPIO_RISE_IE, BIT(offset), | |
50 | (trigger & IRQ_TYPE_EDGE_RISING) ? BIT(offset) : 0); | |
51 | regmap_update_bits(chip->regs, SIFIVE_GPIO_FALL_IE, BIT(offset), | |
52 | (trigger & IRQ_TYPE_EDGE_FALLING) ? BIT(offset) : 0); | |
53 | regmap_update_bits(chip->regs, SIFIVE_GPIO_HIGH_IE, BIT(offset), | |
54 | (trigger & IRQ_TYPE_LEVEL_HIGH) ? BIT(offset) : 0); | |
55 | regmap_update_bits(chip->regs, SIFIVE_GPIO_LOW_IE, BIT(offset), | |
56 | (trigger & IRQ_TYPE_LEVEL_LOW) ? BIT(offset) : 0); | |
3c938cc5 | 57 | raw_spin_unlock_irqrestore(&chip->gc.bgpio_lock, flags); |
96868dce YS |
58 | } |
59 | ||
60 | static int sifive_gpio_irq_set_type(struct irq_data *d, unsigned int trigger) | |
61 | { | |
62 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
63 | struct sifive_gpio *chip = gpiochip_get_data(gc); | |
64 | int offset = irqd_to_hwirq(d); | |
65 | ||
66 | if (offset < 0 || offset >= gc->ngpio) | |
67 | return -EINVAL; | |
68 | ||
69 | chip->trigger[offset] = trigger; | |
70 | sifive_gpio_set_ie(chip, offset); | |
71 | return 0; | |
72 | } | |
73 | ||
74 | static void sifive_gpio_irq_enable(struct irq_data *d) | |
75 | { | |
76 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
77 | struct sifive_gpio *chip = gpiochip_get_data(gc); | |
5a7cb9f3 GU |
78 | irq_hw_number_t hwirq = irqd_to_hwirq(d); |
79 | int offset = hwirq % SIFIVE_GPIO_MAX; | |
96868dce YS |
80 | u32 bit = BIT(offset); |
81 | unsigned long flags; | |
82 | ||
5a7cb9f3 | 83 | gpiochip_enable_irq(gc, hwirq); |
96868dce YS |
84 | irq_chip_enable_parent(d); |
85 | ||
86 | /* Switch to input */ | |
87 | gc->direction_input(gc, offset); | |
88 | ||
3c938cc5 | 89 | raw_spin_lock_irqsave(&gc->bgpio_lock, flags); |
96868dce YS |
90 | /* Clear any sticky pending interrupts */ |
91 | regmap_write(chip->regs, SIFIVE_GPIO_RISE_IP, bit); | |
92 | regmap_write(chip->regs, SIFIVE_GPIO_FALL_IP, bit); | |
93 | regmap_write(chip->regs, SIFIVE_GPIO_HIGH_IP, bit); | |
94 | regmap_write(chip->regs, SIFIVE_GPIO_LOW_IP, bit); | |
3c938cc5 | 95 | raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags); |
96868dce YS |
96 | |
97 | /* Enable interrupts */ | |
a924eae7 | 98 | assign_bit(offset, &chip->irq_state, 1); |
96868dce YS |
99 | sifive_gpio_set_ie(chip, offset); |
100 | } | |
101 | ||
102 | static void sifive_gpio_irq_disable(struct irq_data *d) | |
103 | { | |
104 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
105 | struct sifive_gpio *chip = gpiochip_get_data(gc); | |
5a7cb9f3 GU |
106 | irq_hw_number_t hwirq = irqd_to_hwirq(d); |
107 | int offset = hwirq % SIFIVE_GPIO_MAX; | |
96868dce | 108 | |
a924eae7 | 109 | assign_bit(offset, &chip->irq_state, 0); |
96868dce YS |
110 | sifive_gpio_set_ie(chip, offset); |
111 | irq_chip_disable_parent(d); | |
5a7cb9f3 | 112 | gpiochip_disable_irq(gc, hwirq); |
96868dce YS |
113 | } |
114 | ||
115 | static void sifive_gpio_irq_eoi(struct irq_data *d) | |
116 | { | |
117 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
118 | struct sifive_gpio *chip = gpiochip_get_data(gc); | |
119 | int offset = irqd_to_hwirq(d) % SIFIVE_GPIO_MAX; | |
120 | u32 bit = BIT(offset); | |
121 | unsigned long flags; | |
122 | ||
3c938cc5 | 123 | raw_spin_lock_irqsave(&gc->bgpio_lock, flags); |
96868dce YS |
124 | /* Clear all pending interrupts */ |
125 | regmap_write(chip->regs, SIFIVE_GPIO_RISE_IP, bit); | |
126 | regmap_write(chip->regs, SIFIVE_GPIO_FALL_IP, bit); | |
127 | regmap_write(chip->regs, SIFIVE_GPIO_HIGH_IP, bit); | |
128 | regmap_write(chip->regs, SIFIVE_GPIO_LOW_IP, bit); | |
3c938cc5 | 129 | raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags); |
96868dce YS |
130 | |
131 | irq_chip_eoi_parent(d); | |
132 | } | |
133 | ||
011a78c1 LW |
134 | static int sifive_gpio_irq_set_affinity(struct irq_data *data, |
135 | const struct cpumask *dest, | |
136 | bool force) | |
137 | { | |
138 | if (data->parent_data) | |
139 | return irq_chip_set_affinity_parent(data, dest, force); | |
140 | ||
141 | return -EINVAL; | |
142 | } | |
143 | ||
5a7cb9f3 | 144 | static const struct irq_chip sifive_gpio_irqchip = { |
96868dce YS |
145 | .name = "sifive-gpio", |
146 | .irq_set_type = sifive_gpio_irq_set_type, | |
147 | .irq_mask = irq_chip_mask_parent, | |
148 | .irq_unmask = irq_chip_unmask_parent, | |
149 | .irq_enable = sifive_gpio_irq_enable, | |
150 | .irq_disable = sifive_gpio_irq_disable, | |
151 | .irq_eoi = sifive_gpio_irq_eoi, | |
011a78c1 | 152 | .irq_set_affinity = sifive_gpio_irq_set_affinity, |
5a7cb9f3 GU |
153 | .flags = IRQCHIP_IMMUTABLE, |
154 | GPIOCHIP_IRQ_RESOURCE_HELPERS, | |
96868dce YS |
155 | }; |
156 | ||
157 | static int sifive_gpio_child_to_parent_hwirq(struct gpio_chip *gc, | |
158 | unsigned int child, | |
159 | unsigned int child_type, | |
160 | unsigned int *parent, | |
161 | unsigned int *parent_type) | |
162 | { | |
f52d6d8b GH |
163 | struct sifive_gpio *chip = gpiochip_get_data(gc); |
164 | struct irq_data *d = irq_get_irq_data(chip->irq_number[child]); | |
165 | ||
96868dce | 166 | *parent_type = IRQ_TYPE_NONE; |
f52d6d8b GH |
167 | *parent = irqd_to_hwirq(d); |
168 | ||
96868dce YS |
169 | return 0; |
170 | } | |
171 | ||
172 | static const struct regmap_config sifive_gpio_regmap_config = { | |
173 | .reg_bits = 32, | |
174 | .reg_stride = 4, | |
175 | .val_bits = 32, | |
176 | .fast_io = true, | |
177 | .disable_locking = true, | |
178 | }; | |
179 | ||
180 | static int sifive_gpio_probe(struct platform_device *pdev) | |
181 | { | |
182 | struct device *dev = &pdev->dev; | |
183 | struct device_node *node = pdev->dev.of_node; | |
184 | struct device_node *irq_parent; | |
185 | struct irq_domain *parent; | |
186 | struct gpio_irq_chip *girq; | |
187 | struct sifive_gpio *chip; | |
f52d6d8b | 188 | int ret, ngpio, i; |
96868dce YS |
189 | |
190 | chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); | |
191 | if (!chip) | |
192 | return -ENOMEM; | |
193 | ||
194 | chip->base = devm_platform_ioremap_resource(pdev, 0); | |
195 | if (IS_ERR(chip->base)) { | |
196 | dev_err(dev, "failed to allocate device memory\n"); | |
197 | return PTR_ERR(chip->base); | |
198 | } | |
199 | ||
200 | chip->regs = devm_regmap_init_mmio(dev, chip->base, | |
201 | &sifive_gpio_regmap_config); | |
202 | if (IS_ERR(chip->regs)) | |
203 | return PTR_ERR(chip->regs); | |
204 | ||
205 | ngpio = of_irq_count(node); | |
b72de3ff | 206 | if (ngpio > SIFIVE_GPIO_MAX) { |
96868dce YS |
207 | dev_err(dev, "Too many GPIO interrupts (max=%d)\n", |
208 | SIFIVE_GPIO_MAX); | |
209 | return -ENXIO; | |
210 | } | |
211 | ||
212 | irq_parent = of_irq_find_parent(node); | |
213 | if (!irq_parent) { | |
214 | dev_err(dev, "no IRQ parent node\n"); | |
215 | return -ENODEV; | |
216 | } | |
217 | parent = irq_find_host(irq_parent); | |
694175cd | 218 | of_node_put(irq_parent); |
96868dce YS |
219 | if (!parent) { |
220 | dev_err(dev, "no IRQ parent domain\n"); | |
221 | return -ENODEV; | |
222 | } | |
223 | ||
f52d6d8b GH |
224 | for (i = 0; i < ngpio; i++) |
225 | chip->irq_number[i] = platform_get_irq(pdev, i); | |
226 | ||
96868dce YS |
227 | ret = bgpio_init(&chip->gc, dev, 4, |
228 | chip->base + SIFIVE_GPIO_INPUT_VAL, | |
229 | chip->base + SIFIVE_GPIO_OUTPUT_VAL, | |
230 | NULL, | |
231 | chip->base + SIFIVE_GPIO_OUTPUT_EN, | |
232 | chip->base + SIFIVE_GPIO_INPUT_EN, | |
cc38ef93 | 233 | BGPIOF_READ_OUTPUT_REG_SET); |
96868dce YS |
234 | if (ret) { |
235 | dev_err(dev, "unable to init generic GPIO\n"); | |
236 | return ret; | |
237 | } | |
238 | ||
239 | /* Disable all GPIO interrupts before enabling parent interrupts */ | |
240 | regmap_write(chip->regs, SIFIVE_GPIO_RISE_IE, 0); | |
241 | regmap_write(chip->regs, SIFIVE_GPIO_FALL_IE, 0); | |
242 | regmap_write(chip->regs, SIFIVE_GPIO_HIGH_IE, 0); | |
243 | regmap_write(chip->regs, SIFIVE_GPIO_LOW_IE, 0); | |
244 | chip->irq_state = 0; | |
245 | ||
246 | chip->gc.base = -1; | |
247 | chip->gc.ngpio = ngpio; | |
248 | chip->gc.label = dev_name(dev); | |
249 | chip->gc.parent = dev; | |
250 | chip->gc.owner = THIS_MODULE; | |
251 | girq = &chip->gc.irq; | |
5a7cb9f3 | 252 | gpio_irq_chip_set_chip(girq, &sifive_gpio_irqchip); |
96868dce YS |
253 | girq->fwnode = of_node_to_fwnode(node); |
254 | girq->parent_domain = parent; | |
255 | girq->child_to_parent_hwirq = sifive_gpio_child_to_parent_hwirq; | |
256 | girq->handler = handle_bad_irq; | |
257 | girq->default_type = IRQ_TYPE_NONE; | |
258 | ||
259 | platform_set_drvdata(pdev, chip); | |
260 | return gpiochip_add_data(&chip->gc, chip); | |
261 | } | |
262 | ||
263 | static const struct of_device_id sifive_gpio_match[] = { | |
264 | { .compatible = "sifive,gpio0" }, | |
265 | { .compatible = "sifive,fu540-c000-gpio" }, | |
266 | { }, | |
267 | }; | |
268 | ||
269 | static struct platform_driver sifive_gpio_driver = { | |
270 | .probe = sifive_gpio_probe, | |
271 | .driver = { | |
272 | .name = "sifive_gpio", | |
6ae42529 | 273 | .of_match_table = sifive_gpio_match, |
96868dce YS |
274 | }, |
275 | }; | |
276 | builtin_platform_driver(sifive_gpio_driver) |