1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/drivers/gpio/gpio-mb86s7x.c
5 * Copyright (C) 2015 Fujitsu Semiconductor Limited
6 * Copyright (C) 2015 Linaro Ltd.
9 #include <linux/acpi.h>
11 #include <linux/init.h>
12 #include <linux/clk.h>
13 #include <linux/module.h>
14 #include <linux/err.h>
15 #include <linux/errno.h>
16 #include <linux/ioport.h>
17 #include <linux/of_device.h>
18 #include <linux/gpio/driver.h>
19 #include <linux/platform_device.h>
20 #include <linux/spinlock.h>
21 #include <linux/slab.h>
26 * Only first 8bits of a register correspond to each pin,
27 * so there are 4 registers for 32 pins.
29 #define PDR(x) (0x0 + x / 8 * 4)
30 #define DDR(x) (0x10 + x / 8 * 4)
31 #define PFR(x) (0x20 + x / 8 * 4)
33 #define OFFSET(x) BIT((x) % 8)
35 struct mb86s70_gpio_chip {
42 static int mb86s70_gpio_request(struct gpio_chip *gc, unsigned gpio)
44 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc);
48 spin_lock_irqsave(&gchip->lock, flags);
50 val = readl(gchip->base + PFR(gpio));
52 writel(val, gchip->base + PFR(gpio));
54 spin_unlock_irqrestore(&gchip->lock, flags);
59 static void mb86s70_gpio_free(struct gpio_chip *gc, unsigned gpio)
61 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc);
65 spin_lock_irqsave(&gchip->lock, flags);
67 val = readl(gchip->base + PFR(gpio));
69 writel(val, gchip->base + PFR(gpio));
71 spin_unlock_irqrestore(&gchip->lock, flags);
74 static int mb86s70_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)
76 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc);
80 spin_lock_irqsave(&gchip->lock, flags);
82 val = readl(gchip->base + DDR(gpio));
84 writel(val, gchip->base + DDR(gpio));
86 spin_unlock_irqrestore(&gchip->lock, flags);
91 static int mb86s70_gpio_direction_output(struct gpio_chip *gc,
92 unsigned gpio, int value)
94 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc);
98 spin_lock_irqsave(&gchip->lock, flags);
100 val = readl(gchip->base + PDR(gpio));
104 val &= ~OFFSET(gpio);
105 writel(val, gchip->base + PDR(gpio));
107 val = readl(gchip->base + DDR(gpio));
109 writel(val, gchip->base + DDR(gpio));
111 spin_unlock_irqrestore(&gchip->lock, flags);
116 static int mb86s70_gpio_get(struct gpio_chip *gc, unsigned gpio)
118 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc);
120 return !!(readl(gchip->base + PDR(gpio)) & OFFSET(gpio));
123 static void mb86s70_gpio_set(struct gpio_chip *gc, unsigned gpio, int value)
125 struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc);
129 spin_lock_irqsave(&gchip->lock, flags);
131 val = readl(gchip->base + PDR(gpio));
135 val &= ~OFFSET(gpio);
136 writel(val, gchip->base + PDR(gpio));
138 spin_unlock_irqrestore(&gchip->lock, flags);
141 static int mb86s70_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
145 for (index = 0;; index++) {
146 irq = platform_get_irq(to_platform_device(gc->parent), index);
149 if (irq_get_irq_data(irq)->hwirq == offset)
155 static int mb86s70_gpio_probe(struct platform_device *pdev)
157 struct mb86s70_gpio_chip *gchip;
160 gchip = devm_kzalloc(&pdev->dev, sizeof(*gchip), GFP_KERNEL);
164 platform_set_drvdata(pdev, gchip);
166 gchip->base = devm_platform_ioremap_resource(pdev, 0);
167 if (IS_ERR(gchip->base))
168 return PTR_ERR(gchip->base);
170 if (!has_acpi_companion(&pdev->dev)) {
171 gchip->clk = devm_clk_get(&pdev->dev, NULL);
172 if (IS_ERR(gchip->clk))
173 return PTR_ERR(gchip->clk);
175 ret = clk_prepare_enable(gchip->clk);
180 spin_lock_init(&gchip->lock);
182 gchip->gc.direction_output = mb86s70_gpio_direction_output;
183 gchip->gc.direction_input = mb86s70_gpio_direction_input;
184 gchip->gc.request = mb86s70_gpio_request;
185 gchip->gc.free = mb86s70_gpio_free;
186 gchip->gc.get = mb86s70_gpio_get;
187 gchip->gc.set = mb86s70_gpio_set;
188 gchip->gc.label = dev_name(&pdev->dev);
189 gchip->gc.ngpio = 32;
190 gchip->gc.owner = THIS_MODULE;
191 gchip->gc.parent = &pdev->dev;
194 if (has_acpi_companion(&pdev->dev))
195 gchip->gc.to_irq = mb86s70_gpio_to_irq;
197 ret = gpiochip_add_data(&gchip->gc, gchip);
199 dev_err(&pdev->dev, "couldn't register gpio driver\n");
200 clk_disable_unprepare(gchip->clk);
204 if (has_acpi_companion(&pdev->dev))
205 acpi_gpiochip_request_interrupts(&gchip->gc);
210 static int mb86s70_gpio_remove(struct platform_device *pdev)
212 struct mb86s70_gpio_chip *gchip = platform_get_drvdata(pdev);
214 if (has_acpi_companion(&pdev->dev))
215 acpi_gpiochip_free_interrupts(&gchip->gc);
216 gpiochip_remove(&gchip->gc);
217 clk_disable_unprepare(gchip->clk);
222 static const struct of_device_id mb86s70_gpio_dt_ids[] = {
223 { .compatible = "fujitsu,mb86s70-gpio" },
226 MODULE_DEVICE_TABLE(of, mb86s70_gpio_dt_ids);
229 static const struct acpi_device_id mb86s70_gpio_acpi_ids[] = {
233 MODULE_DEVICE_TABLE(acpi, mb86s70_gpio_acpi_ids);
236 static struct platform_driver mb86s70_gpio_driver = {
238 .name = "mb86s70-gpio",
239 .of_match_table = mb86s70_gpio_dt_ids,
240 .acpi_match_table = ACPI_PTR(mb86s70_gpio_acpi_ids),
242 .probe = mb86s70_gpio_probe,
243 .remove = mb86s70_gpio_remove,
245 module_platform_driver(mb86s70_gpio_driver);
247 MODULE_DESCRIPTION("MB86S7x GPIO Driver");
248 MODULE_ALIAS("platform:mb86s70-gpio");
249 MODULE_LICENSE("GPL");