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8e8e69d6 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
0da094d8 JB |
2 | /* |
3 | * linux/drivers/gpio/gpio-mb86s7x.c | |
4 | * | |
5 | * Copyright (C) 2015 Fujitsu Semiconductor Limited | |
6 | * Copyright (C) 2015 Linaro Ltd. | |
0da094d8 JB |
7 | */ |
8 | ||
f3d705d5 | 9 | #include <linux/acpi.h> |
0da094d8 JB |
10 | #include <linux/io.h> |
11 | #include <linux/init.h> | |
12 | #include <linux/clk.h> | |
e1289dba | 13 | #include <linux/module.h> |
0da094d8 JB |
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> | |
22 | ||
f3d705d5 | 23 | #include "gpiolib.h" |
77cb907a | 24 | #include "gpiolib-acpi.h" |
f3d705d5 | 25 | |
0da094d8 JB |
26 | /* |
27 | * Only first 8bits of a register correspond to each pin, | |
28 | * so there are 4 registers for 32 pins. | |
29 | */ | |
30 | #define PDR(x) (0x0 + x / 8 * 4) | |
31 | #define DDR(x) (0x10 + x / 8 * 4) | |
32 | #define PFR(x) (0x20 + x / 8 * 4) | |
33 | ||
34 | #define OFFSET(x) BIT((x) % 8) | |
35 | ||
36 | struct mb86s70_gpio_chip { | |
37 | struct gpio_chip gc; | |
38 | void __iomem *base; | |
39 | struct clk *clk; | |
40 | spinlock_t lock; | |
41 | }; | |
42 | ||
0da094d8 JB |
43 | static int mb86s70_gpio_request(struct gpio_chip *gc, unsigned gpio) |
44 | { | |
01f76b26 | 45 | struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); |
0da094d8 JB |
46 | unsigned long flags; |
47 | u32 val; | |
48 | ||
49 | spin_lock_irqsave(&gchip->lock, flags); | |
50 | ||
51 | val = readl(gchip->base + PFR(gpio)); | |
52 | val &= ~OFFSET(gpio); | |
53 | writel(val, gchip->base + PFR(gpio)); | |
54 | ||
55 | spin_unlock_irqrestore(&gchip->lock, flags); | |
56 | ||
57 | return 0; | |
58 | } | |
59 | ||
60 | static void mb86s70_gpio_free(struct gpio_chip *gc, unsigned gpio) | |
61 | { | |
01f76b26 | 62 | struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); |
0da094d8 JB |
63 | unsigned long flags; |
64 | u32 val; | |
65 | ||
66 | spin_lock_irqsave(&gchip->lock, flags); | |
67 | ||
68 | val = readl(gchip->base + PFR(gpio)); | |
69 | val |= OFFSET(gpio); | |
70 | writel(val, gchip->base + PFR(gpio)); | |
71 | ||
72 | spin_unlock_irqrestore(&gchip->lock, flags); | |
73 | } | |
74 | ||
75 | static int mb86s70_gpio_direction_input(struct gpio_chip *gc, unsigned gpio) | |
76 | { | |
01f76b26 | 77 | struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); |
0da094d8 JB |
78 | unsigned long flags; |
79 | unsigned char val; | |
80 | ||
81 | spin_lock_irqsave(&gchip->lock, flags); | |
82 | ||
83 | val = readl(gchip->base + DDR(gpio)); | |
84 | val &= ~OFFSET(gpio); | |
85 | writel(val, gchip->base + DDR(gpio)); | |
86 | ||
87 | spin_unlock_irqrestore(&gchip->lock, flags); | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
92 | static int mb86s70_gpio_direction_output(struct gpio_chip *gc, | |
93 | unsigned gpio, int value) | |
94 | { | |
01f76b26 | 95 | struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); |
0da094d8 JB |
96 | unsigned long flags; |
97 | unsigned char val; | |
98 | ||
99 | spin_lock_irqsave(&gchip->lock, flags); | |
100 | ||
101 | val = readl(gchip->base + PDR(gpio)); | |
102 | if (value) | |
103 | val |= OFFSET(gpio); | |
104 | else | |
105 | val &= ~OFFSET(gpio); | |
106 | writel(val, gchip->base + PDR(gpio)); | |
107 | ||
108 | val = readl(gchip->base + DDR(gpio)); | |
109 | val |= OFFSET(gpio); | |
110 | writel(val, gchip->base + DDR(gpio)); | |
111 | ||
112 | spin_unlock_irqrestore(&gchip->lock, flags); | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | static int mb86s70_gpio_get(struct gpio_chip *gc, unsigned gpio) | |
118 | { | |
01f76b26 | 119 | struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); |
0da094d8 JB |
120 | |
121 | return !!(readl(gchip->base + PDR(gpio)) & OFFSET(gpio)); | |
122 | } | |
123 | ||
124 | static void mb86s70_gpio_set(struct gpio_chip *gc, unsigned gpio, int value) | |
125 | { | |
01f76b26 | 126 | struct mb86s70_gpio_chip *gchip = gpiochip_get_data(gc); |
0da094d8 JB |
127 | unsigned long flags; |
128 | unsigned char val; | |
129 | ||
130 | spin_lock_irqsave(&gchip->lock, flags); | |
131 | ||
132 | val = readl(gchip->base + PDR(gpio)); | |
133 | if (value) | |
134 | val |= OFFSET(gpio); | |
135 | else | |
136 | val &= ~OFFSET(gpio); | |
137 | writel(val, gchip->base + PDR(gpio)); | |
138 | ||
139 | spin_unlock_irqrestore(&gchip->lock, flags); | |
140 | } | |
141 | ||
f3d705d5 AB |
142 | static int mb86s70_gpio_to_irq(struct gpio_chip *gc, unsigned int offset) |
143 | { | |
144 | int irq, index; | |
145 | ||
146 | for (index = 0;; index++) { | |
147 | irq = platform_get_irq(to_platform_device(gc->parent), index); | |
148 | if (irq <= 0) | |
149 | break; | |
150 | if (irq_get_irq_data(irq)->hwirq == offset) | |
151 | return irq; | |
152 | } | |
153 | return -EINVAL; | |
154 | } | |
155 | ||
0da094d8 JB |
156 | static int mb86s70_gpio_probe(struct platform_device *pdev) |
157 | { | |
158 | struct mb86s70_gpio_chip *gchip; | |
0da094d8 JB |
159 | int ret; |
160 | ||
161 | gchip = devm_kzalloc(&pdev->dev, sizeof(*gchip), GFP_KERNEL); | |
162 | if (gchip == NULL) | |
163 | return -ENOMEM; | |
164 | ||
165 | platform_set_drvdata(pdev, gchip); | |
166 | ||
329e23f9 | 167 | gchip->base = devm_platform_ioremap_resource(pdev, 0); |
0da094d8 JB |
168 | if (IS_ERR(gchip->base)) |
169 | return PTR_ERR(gchip->base); | |
170 | ||
f3d705d5 AB |
171 | if (!has_acpi_companion(&pdev->dev)) { |
172 | gchip->clk = devm_clk_get(&pdev->dev, NULL); | |
173 | if (IS_ERR(gchip->clk)) | |
174 | return PTR_ERR(gchip->clk); | |
0da094d8 | 175 | |
f3d705d5 AB |
176 | ret = clk_prepare_enable(gchip->clk); |
177 | if (ret) | |
178 | return ret; | |
179 | } | |
0da094d8 JB |
180 | |
181 | spin_lock_init(&gchip->lock); | |
182 | ||
183 | gchip->gc.direction_output = mb86s70_gpio_direction_output; | |
184 | gchip->gc.direction_input = mb86s70_gpio_direction_input; | |
185 | gchip->gc.request = mb86s70_gpio_request; | |
186 | gchip->gc.free = mb86s70_gpio_free; | |
187 | gchip->gc.get = mb86s70_gpio_get; | |
188 | gchip->gc.set = mb86s70_gpio_set; | |
189 | gchip->gc.label = dev_name(&pdev->dev); | |
190 | gchip->gc.ngpio = 32; | |
191 | gchip->gc.owner = THIS_MODULE; | |
58383c78 | 192 | gchip->gc.parent = &pdev->dev; |
0da094d8 JB |
193 | gchip->gc.base = -1; |
194 | ||
f3d705d5 AB |
195 | if (has_acpi_companion(&pdev->dev)) |
196 | gchip->gc.to_irq = mb86s70_gpio_to_irq; | |
197 | ||
01f76b26 | 198 | ret = gpiochip_add_data(&gchip->gc, gchip); |
0da094d8 JB |
199 | if (ret) { |
200 | dev_err(&pdev->dev, "couldn't register gpio driver\n"); | |
201 | clk_disable_unprepare(gchip->clk); | |
f3d705d5 | 202 | return ret; |
0da094d8 JB |
203 | } |
204 | ||
f3d705d5 AB |
205 | if (has_acpi_companion(&pdev->dev)) |
206 | acpi_gpiochip_request_interrupts(&gchip->gc); | |
207 | ||
208 | return 0; | |
0da094d8 JB |
209 | } |
210 | ||
211 | static int mb86s70_gpio_remove(struct platform_device *pdev) | |
212 | { | |
213 | struct mb86s70_gpio_chip *gchip = platform_get_drvdata(pdev); | |
214 | ||
f3d705d5 AB |
215 | if (has_acpi_companion(&pdev->dev)) |
216 | acpi_gpiochip_free_interrupts(&gchip->gc); | |
0da094d8 JB |
217 | gpiochip_remove(&gchip->gc); |
218 | clk_disable_unprepare(gchip->clk); | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | static const struct of_device_id mb86s70_gpio_dt_ids[] = { | |
224 | { .compatible = "fujitsu,mb86s70-gpio" }, | |
225 | { /* sentinel */ } | |
226 | }; | |
e1289dba | 227 | MODULE_DEVICE_TABLE(of, mb86s70_gpio_dt_ids); |
0da094d8 | 228 | |
f3d705d5 AB |
229 | #ifdef CONFIG_ACPI |
230 | static const struct acpi_device_id mb86s70_gpio_acpi_ids[] = { | |
231 | { "SCX0007" }, | |
232 | { /* sentinel */ } | |
233 | }; | |
234 | MODULE_DEVICE_TABLE(acpi, mb86s70_gpio_acpi_ids); | |
235 | #endif | |
236 | ||
0da094d8 JB |
237 | static struct platform_driver mb86s70_gpio_driver = { |
238 | .driver = { | |
239 | .name = "mb86s70-gpio", | |
240 | .of_match_table = mb86s70_gpio_dt_ids, | |
f3d705d5 | 241 | .acpi_match_table = ACPI_PTR(mb86s70_gpio_acpi_ids), |
0da094d8 JB |
242 | }, |
243 | .probe = mb86s70_gpio_probe, | |
244 | .remove = mb86s70_gpio_remove, | |
245 | }; | |
e1289dba | 246 | module_platform_driver(mb86s70_gpio_driver); |
0da094d8 | 247 | |
e1289dba AB |
248 | MODULE_DESCRIPTION("MB86S7x GPIO Driver"); |
249 | MODULE_ALIAS("platform:mb86s70-gpio"); | |
250 | MODULE_LICENSE("GPL"); |