1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2020 HiSilicon Limited. */
3 #include <linux/gpio/driver.h>
4 #include <linux/module.h>
5 #include <linux/mod_devicetable.h>
6 #include <linux/platform_device.h>
7 #include <linux/property.h>
9 #define HISI_GPIO_SWPORT_DR_SET_WX 0x000
10 #define HISI_GPIO_SWPORT_DR_CLR_WX 0x004
11 #define HISI_GPIO_SWPORT_DDR_SET_WX 0x010
12 #define HISI_GPIO_SWPORT_DDR_CLR_WX 0x014
13 #define HISI_GPIO_SWPORT_DDR_ST_WX 0x018
14 #define HISI_GPIO_INTEN_SET_WX 0x020
15 #define HISI_GPIO_INTEN_CLR_WX 0x024
16 #define HISI_GPIO_INTMASK_SET_WX 0x030
17 #define HISI_GPIO_INTMASK_CLR_WX 0x034
18 #define HISI_GPIO_INTTYPE_EDGE_SET_WX 0x040
19 #define HISI_GPIO_INTTYPE_EDGE_CLR_WX 0x044
20 #define HISI_GPIO_INT_POLARITY_SET_WX 0x050
21 #define HISI_GPIO_INT_POLARITY_CLR_WX 0x054
22 #define HISI_GPIO_DEBOUNCE_SET_WX 0x060
23 #define HISI_GPIO_DEBOUNCE_CLR_WX 0x064
24 #define HISI_GPIO_INTSTATUS_WX 0x070
25 #define HISI_GPIO_PORTA_EOI_WX 0x078
26 #define HISI_GPIO_EXT_PORT_WX 0x080
27 #define HISI_GPIO_INTCOMB_MASK_WX 0x0a0
28 #define HISI_GPIO_INT_DEDGE_SET 0x0b0
29 #define HISI_GPIO_INT_DEDGE_CLR 0x0b4
30 #define HISI_GPIO_INT_DEDGE_ST 0x0b8
32 #define HISI_GPIO_LINE_NUM_MAX 32
33 #define HISI_GPIO_DRIVER_NAME "gpio-hisi"
36 struct gpio_chip chip;
38 void __iomem *reg_base;
39 unsigned int line_num;
40 struct irq_chip irq_chip;
44 static inline u32 hisi_gpio_read_reg(struct gpio_chip *chip,
47 struct hisi_gpio *hisi_gpio =
48 container_of(chip, struct hisi_gpio, chip);
49 void __iomem *reg = hisi_gpio->reg_base + off;
54 static inline void hisi_gpio_write_reg(struct gpio_chip *chip,
55 unsigned int off, u32 val)
57 struct hisi_gpio *hisi_gpio =
58 container_of(chip, struct hisi_gpio, chip);
59 void __iomem *reg = hisi_gpio->reg_base + off;
64 static void hisi_gpio_set_debounce(struct gpio_chip *chip, unsigned int off,
68 hisi_gpio_write_reg(chip, HISI_GPIO_DEBOUNCE_SET_WX, BIT(off));
70 hisi_gpio_write_reg(chip, HISI_GPIO_DEBOUNCE_CLR_WX, BIT(off));
73 static int hisi_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
76 u32 config_para = pinconf_to_config_param(config);
79 switch (config_para) {
80 case PIN_CONFIG_INPUT_DEBOUNCE:
81 config_arg = pinconf_to_config_argument(config);
82 hisi_gpio_set_debounce(chip, offset, config_arg);
91 static void hisi_gpio_set_ack(struct irq_data *d)
93 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
95 hisi_gpio_write_reg(chip, HISI_GPIO_PORTA_EOI_WX, BIT(irqd_to_hwirq(d)));
98 static void hisi_gpio_irq_set_mask(struct irq_data *d)
100 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
102 hisi_gpio_write_reg(chip, HISI_GPIO_INTMASK_SET_WX, BIT(irqd_to_hwirq(d)));
105 static void hisi_gpio_irq_clr_mask(struct irq_data *d)
107 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
109 hisi_gpio_write_reg(chip, HISI_GPIO_INTMASK_CLR_WX, BIT(irqd_to_hwirq(d)));
112 static int hisi_gpio_irq_set_type(struct irq_data *d, u32 type)
114 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
115 unsigned int mask = BIT(irqd_to_hwirq(d));
118 case IRQ_TYPE_EDGE_BOTH:
119 hisi_gpio_write_reg(chip, HISI_GPIO_INT_DEDGE_SET, mask);
121 case IRQ_TYPE_EDGE_RISING:
122 hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_SET_WX, mask);
123 hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_SET_WX, mask);
125 case IRQ_TYPE_EDGE_FALLING:
126 hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_SET_WX, mask);
127 hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_CLR_WX, mask);
129 case IRQ_TYPE_LEVEL_HIGH:
130 hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_CLR_WX, mask);
131 hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_SET_WX, mask);
133 case IRQ_TYPE_LEVEL_LOW:
134 hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_CLR_WX, mask);
135 hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_CLR_WX, mask);
142 * The dual-edge interrupt and other interrupt's registers do not
143 * take effect at the same time. The registers of the two-edge
144 * interrupts have higher priorities, the configuration of
145 * the dual-edge interrupts must be disabled before the configuration
146 * of other kind of interrupts.
148 if (type != IRQ_TYPE_EDGE_BOTH) {
149 unsigned int both = hisi_gpio_read_reg(chip, HISI_GPIO_INT_DEDGE_ST);
152 hisi_gpio_write_reg(chip, HISI_GPIO_INT_DEDGE_CLR, mask);
155 if (type & IRQ_TYPE_LEVEL_MASK)
156 irq_set_handler_locked(d, handle_level_irq);
157 else if (type & IRQ_TYPE_EDGE_BOTH)
158 irq_set_handler_locked(d, handle_edge_irq);
163 static void hisi_gpio_irq_enable(struct irq_data *d)
165 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
167 hisi_gpio_irq_clr_mask(d);
168 hisi_gpio_write_reg(chip, HISI_GPIO_INTEN_SET_WX, BIT(irqd_to_hwirq(d)));
171 static void hisi_gpio_irq_disable(struct irq_data *d)
173 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
175 hisi_gpio_irq_set_mask(d);
176 hisi_gpio_write_reg(chip, HISI_GPIO_INTEN_CLR_WX, BIT(irqd_to_hwirq(d)));
179 static void hisi_gpio_irq_handler(struct irq_desc *desc)
181 struct hisi_gpio *hisi_gpio = irq_desc_get_handler_data(desc);
182 unsigned long irq_msk = hisi_gpio_read_reg(&hisi_gpio->chip,
183 HISI_GPIO_INTSTATUS_WX);
184 struct irq_chip *irq_c = irq_desc_get_chip(desc);
187 chained_irq_enter(irq_c, desc);
188 for_each_set_bit(hwirq, &irq_msk, HISI_GPIO_LINE_NUM_MAX)
189 generic_handle_domain_irq(hisi_gpio->chip.irq.domain,
191 chained_irq_exit(irq_c, desc);
194 static void hisi_gpio_init_irq(struct hisi_gpio *hisi_gpio)
196 struct gpio_chip *chip = &hisi_gpio->chip;
197 struct gpio_irq_chip *girq_chip = &chip->irq;
199 /* Set hooks for irq_chip */
200 hisi_gpio->irq_chip.irq_ack = hisi_gpio_set_ack;
201 hisi_gpio->irq_chip.irq_mask = hisi_gpio_irq_set_mask;
202 hisi_gpio->irq_chip.irq_unmask = hisi_gpio_irq_clr_mask;
203 hisi_gpio->irq_chip.irq_set_type = hisi_gpio_irq_set_type;
204 hisi_gpio->irq_chip.irq_enable = hisi_gpio_irq_enable;
205 hisi_gpio->irq_chip.irq_disable = hisi_gpio_irq_disable;
207 girq_chip->chip = &hisi_gpio->irq_chip;
208 girq_chip->default_type = IRQ_TYPE_NONE;
209 girq_chip->num_parents = 1;
210 girq_chip->parents = &hisi_gpio->irq;
211 girq_chip->parent_handler = hisi_gpio_irq_handler;
212 girq_chip->parent_handler_data = hisi_gpio;
214 /* Clear Mask of GPIO controller combine IRQ */
215 hisi_gpio_write_reg(chip, HISI_GPIO_INTCOMB_MASK_WX, 1);
218 static const struct acpi_device_id hisi_gpio_acpi_match[] = {
222 MODULE_DEVICE_TABLE(acpi, hisi_gpio_acpi_match);
224 static void hisi_gpio_get_pdata(struct device *dev,
225 struct hisi_gpio *hisi_gpio)
227 struct platform_device *pdev = to_platform_device(dev);
228 struct fwnode_handle *fwnode;
231 device_for_each_child_node(dev, fwnode) {
232 /* Cycle for once, no need for an array to save line_num */
233 if (fwnode_property_read_u32(fwnode, "ngpios",
234 &hisi_gpio->line_num)) {
236 "failed to get number of lines for port%d and use default value instead\n",
238 hisi_gpio->line_num = HISI_GPIO_LINE_NUM_MAX;
241 if (WARN_ON(hisi_gpio->line_num > HISI_GPIO_LINE_NUM_MAX))
242 hisi_gpio->line_num = HISI_GPIO_LINE_NUM_MAX;
244 hisi_gpio->irq = platform_get_irq(pdev, idx);
247 "get hisi_gpio[%d] with %d lines\n", idx,
248 hisi_gpio->line_num);
254 static int hisi_gpio_probe(struct platform_device *pdev)
256 struct device *dev = &pdev->dev;
257 struct hisi_gpio *hisi_gpio;
262 * One GPIO controller own one port currently,
263 * if we get more from ACPI table, return error.
265 port_num = device_get_child_node_count(dev);
266 if (WARN_ON(port_num != 1))
269 hisi_gpio = devm_kzalloc(dev, sizeof(*hisi_gpio), GFP_KERNEL);
273 hisi_gpio->reg_base = devm_platform_ioremap_resource(pdev, 0);
274 if (IS_ERR(hisi_gpio->reg_base))
275 return PTR_ERR(hisi_gpio->reg_base);
277 hisi_gpio_get_pdata(dev, hisi_gpio);
279 hisi_gpio->dev = dev;
281 ret = bgpio_init(&hisi_gpio->chip, hisi_gpio->dev, 0x4,
282 hisi_gpio->reg_base + HISI_GPIO_EXT_PORT_WX,
283 hisi_gpio->reg_base + HISI_GPIO_SWPORT_DR_SET_WX,
284 hisi_gpio->reg_base + HISI_GPIO_SWPORT_DR_CLR_WX,
285 hisi_gpio->reg_base + HISI_GPIO_SWPORT_DDR_SET_WX,
286 hisi_gpio->reg_base + HISI_GPIO_SWPORT_DDR_CLR_WX,
287 BGPIOF_NO_SET_ON_INPUT);
289 dev_err(dev, "failed to init, ret = %d\n", ret);
293 hisi_gpio->chip.set_config = hisi_gpio_set_config;
294 hisi_gpio->chip.ngpio = hisi_gpio->line_num;
295 hisi_gpio->chip.bgpio_dir_unreadable = 1;
296 hisi_gpio->chip.base = -1;
298 if (hisi_gpio->irq > 0)
299 hisi_gpio_init_irq(hisi_gpio);
301 ret = devm_gpiochip_add_data(dev, &hisi_gpio->chip, hisi_gpio);
303 dev_err(dev, "failed to register gpiochip, ret = %d\n", ret);
310 static struct platform_driver hisi_gpio_driver = {
312 .name = HISI_GPIO_DRIVER_NAME,
313 .acpi_match_table = hisi_gpio_acpi_match,
315 .probe = hisi_gpio_probe,
318 module_platform_driver(hisi_gpio_driver);
320 MODULE_LICENSE("GPL");
321 MODULE_AUTHOR("Luo Jiaxing <luojiaxing@huawei.com>");
322 MODULE_DESCRIPTION("HiSilicon GPIO controller driver");
323 MODULE_ALIAS("platform:" HISI_GPIO_DRIVER_NAME);