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1 | /* Abilis Systems MODULE DESCRIPTION |
2 | * | |
3 | * Copyright (C) Abilis Systems 2013 | |
4 | * | |
5 | * Authors: Sascha Leuenberger <sascha.leuenberger@abilis.com> | |
6 | * Christian Ruppert <christian.ruppert@abilis.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <linux/kernel.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/platform_device.h> | |
32e49b9a | 25 | #include <linux/gpio/driver.h> |
c6ce2b6b CR |
26 | #include <linux/slab.h> |
27 | #include <linux/irq.h> | |
28 | #include <linux/irqdomain.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/io.h> | |
31 | #include <linux/of.h> | |
32 | #include <linux/of_platform.h> | |
c6ce2b6b CR |
33 | #include <linux/spinlock.h> |
34 | #include <linux/bitops.h> | |
35 | #include <linux/pinctrl/consumer.h> | |
36 | ||
37 | #define TB10X_GPIO_DIR_IN (0x00000000) | |
38 | #define TB10X_GPIO_DIR_OUT (0x00000001) | |
39 | #define OFFSET_TO_REG_DDR (0x00) | |
40 | #define OFFSET_TO_REG_DATA (0x04) | |
41 | #define OFFSET_TO_REG_INT_EN (0x08) | |
42 | #define OFFSET_TO_REG_CHANGE (0x0C) | |
43 | #define OFFSET_TO_REG_WRMASK (0x10) | |
44 | #define OFFSET_TO_REG_INT_TYPE (0x14) | |
45 | ||
46 | ||
47 | /** | |
c6ce2b6b CR |
48 | * @base: register base address |
49 | * @domain: IRQ domain of GPIO generated interrupts managed by this controller | |
50 | * @irq: Interrupt line of parent interrupt controller | |
51 | * @gc: gpio_chip structure associated to this GPIO controller | |
52 | */ | |
53 | struct tb10x_gpio { | |
c6ce2b6b CR |
54 | void __iomem *base; |
55 | struct irq_domain *domain; | |
56 | int irq; | |
57 | struct gpio_chip gc; | |
58 | }; | |
59 | ||
60 | static inline u32 tb10x_reg_read(struct tb10x_gpio *gpio, unsigned int offs) | |
61 | { | |
62 | return ioread32(gpio->base + offs); | |
63 | } | |
64 | ||
65 | static inline void tb10x_reg_write(struct tb10x_gpio *gpio, unsigned int offs, | |
66 | u32 val) | |
67 | { | |
68 | iowrite32(val, gpio->base + offs); | |
69 | } | |
70 | ||
71 | static inline void tb10x_set_bits(struct tb10x_gpio *gpio, unsigned int offs, | |
72 | u32 mask, u32 val) | |
73 | { | |
74 | u32 r; | |
75 | unsigned long flags; | |
76 | ||
0d1e31ab | 77 | spin_lock_irqsave(&gpio->gc.bgpio_lock, flags); |
c6ce2b6b CR |
78 | |
79 | r = tb10x_reg_read(gpio, offs); | |
80 | r = (r & ~mask) | (val & mask); | |
81 | ||
82 | tb10x_reg_write(gpio, offs, r); | |
83 | ||
0d1e31ab | 84 | spin_unlock_irqrestore(&gpio->gc.bgpio_lock, flags); |
c6ce2b6b CR |
85 | } |
86 | ||
c6ce2b6b CR |
87 | static int tb10x_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
88 | { | |
0ca8c5c4 | 89 | struct tb10x_gpio *tb10x_gpio = gpiochip_get_data(chip); |
c6ce2b6b CR |
90 | |
91 | return irq_create_mapping(tb10x_gpio->domain, offset); | |
92 | } | |
93 | ||
94 | static int tb10x_gpio_irq_set_type(struct irq_data *data, unsigned int type) | |
95 | { | |
96 | if ((type & IRQF_TRIGGER_MASK) != IRQ_TYPE_EDGE_BOTH) { | |
97 | pr_err("Only (both) edge triggered interrupts supported.\n"); | |
98 | return -EINVAL; | |
99 | } | |
100 | ||
101 | irqd_set_trigger_type(data, type); | |
102 | ||
103 | return IRQ_SET_MASK_OK; | |
104 | } | |
105 | ||
106 | static irqreturn_t tb10x_gpio_irq_cascade(int irq, void *data) | |
107 | { | |
108 | struct tb10x_gpio *tb10x_gpio = data; | |
109 | u32 r = tb10x_reg_read(tb10x_gpio, OFFSET_TO_REG_CHANGE); | |
110 | u32 m = tb10x_reg_read(tb10x_gpio, OFFSET_TO_REG_INT_EN); | |
111 | const unsigned long bits = r & m; | |
112 | int i; | |
113 | ||
114 | for_each_set_bit(i, &bits, 32) | |
115 | generic_handle_irq(irq_find_mapping(tb10x_gpio->domain, i)); | |
116 | ||
117 | return IRQ_HANDLED; | |
118 | } | |
119 | ||
120 | static int tb10x_gpio_probe(struct platform_device *pdev) | |
121 | { | |
122 | struct tb10x_gpio *tb10x_gpio; | |
d28af35b LW |
123 | struct device *dev = &pdev->dev; |
124 | struct device_node *np = dev->of_node; | |
c6ce2b6b CR |
125 | int ret = -EBUSY; |
126 | u32 ngpio; | |
127 | ||
d28af35b | 128 | if (!np) |
c6ce2b6b CR |
129 | return -EINVAL; |
130 | ||
d28af35b | 131 | if (of_property_read_u32(np, "abilis,ngpio", &ngpio)) |
c6ce2b6b CR |
132 | return -EINVAL; |
133 | ||
d28af35b | 134 | tb10x_gpio = devm_kzalloc(dev, sizeof(*tb10x_gpio), GFP_KERNEL); |
c6ce2b6b CR |
135 | if (tb10x_gpio == NULL) |
136 | return -ENOMEM; | |
137 | ||
5b827ff5 | 138 | tb10x_gpio->base = devm_platform_ioremap_resource(pdev, 0); |
9a4864c8 WY |
139 | if (IS_ERR(tb10x_gpio->base)) |
140 | return PTR_ERR(tb10x_gpio->base); | |
c6ce2b6b | 141 | |
d28af35b LW |
142 | tb10x_gpio->gc.label = |
143 | devm_kasprintf(dev, GFP_KERNEL, "%pOF", pdev->dev.of_node); | |
a5ae5f5c AY |
144 | if (!tb10x_gpio->gc.label) |
145 | return -ENOMEM; | |
146 | ||
0d1e31ab LW |
147 | /* |
148 | * Initialize generic GPIO with one single register for reading and setting | |
149 | * the lines, no special set or clear registers and a data direction register | |
150 | * wher 1 means "output". | |
151 | */ | |
152 | ret = bgpio_init(&tb10x_gpio->gc, dev, 4, | |
153 | tb10x_gpio->base + OFFSET_TO_REG_DATA, | |
154 | NULL, | |
155 | NULL, | |
156 | tb10x_gpio->base + OFFSET_TO_REG_DDR, | |
157 | NULL, | |
158 | 0); | |
159 | if (ret) { | |
160 | dev_err(dev, "unable to init generic GPIO\n"); | |
161 | return ret; | |
162 | } | |
163 | tb10x_gpio->gc.base = -1; | |
164 | tb10x_gpio->gc.parent = dev; | |
165 | tb10x_gpio->gc.owner = THIS_MODULE; | |
166 | /* | |
167 | * ngpio is set by bgpio_init() but we override it, this .request() | |
168 | * callback also overrides the one set up by generic GPIO. | |
169 | */ | |
170 | tb10x_gpio->gc.ngpio = ngpio; | |
171 | tb10x_gpio->gc.request = gpiochip_generic_request; | |
172 | tb10x_gpio->gc.free = gpiochip_generic_free; | |
173 | ||
174 | ret = devm_gpiochip_add_data(dev, &tb10x_gpio->gc, tb10x_gpio); | |
c6ce2b6b | 175 | if (ret < 0) { |
d28af35b | 176 | dev_err(dev, "Could not add gpiochip.\n"); |
ad7b550a | 177 | return ret; |
c6ce2b6b CR |
178 | } |
179 | ||
180 | platform_set_drvdata(pdev, tb10x_gpio); | |
181 | ||
d28af35b | 182 | if (of_find_property(np, "interrupt-controller", NULL)) { |
c6ce2b6b CR |
183 | struct irq_chip_generic *gc; |
184 | ||
185 | ret = platform_get_irq(pdev, 0); | |
186 | if (ret < 0) { | |
d28af35b | 187 | dev_err(dev, "No interrupt specified.\n"); |
ad7b550a | 188 | return ret; |
c6ce2b6b CR |
189 | } |
190 | ||
191 | tb10x_gpio->gc.to_irq = tb10x_gpio_to_irq; | |
192 | tb10x_gpio->irq = ret; | |
193 | ||
d28af35b | 194 | ret = devm_request_irq(dev, ret, tb10x_gpio_irq_cascade, |
c6ce2b6b | 195 | IRQF_TRIGGER_NONE | IRQF_SHARED, |
d28af35b | 196 | dev_name(dev), tb10x_gpio); |
c6ce2b6b | 197 | if (ret != 0) |
ad7b550a | 198 | return ret; |
c6ce2b6b | 199 | |
d28af35b | 200 | tb10x_gpio->domain = irq_domain_add_linear(np, |
c6ce2b6b CR |
201 | tb10x_gpio->gc.ngpio, |
202 | &irq_generic_chip_ops, NULL); | |
203 | if (!tb10x_gpio->domain) { | |
ad7b550a | 204 | return -ENOMEM; |
c6ce2b6b CR |
205 | } |
206 | ||
207 | ret = irq_alloc_domain_generic_chips(tb10x_gpio->domain, | |
208 | tb10x_gpio->gc.ngpio, 1, tb10x_gpio->gc.label, | |
209 | handle_edge_irq, IRQ_NOREQUEST, IRQ_NOPROBE, | |
210 | IRQ_GC_INIT_MASK_CACHE); | |
211 | if (ret) | |
ad7b550a | 212 | return ret; |
c6ce2b6b CR |
213 | |
214 | gc = tb10x_gpio->domain->gc->gc[0]; | |
215 | gc->reg_base = tb10x_gpio->base; | |
216 | gc->chip_types[0].type = IRQ_TYPE_EDGE_BOTH; | |
217 | gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit; | |
218 | gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit; | |
219 | gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit; | |
220 | gc->chip_types[0].chip.irq_set_type = tb10x_gpio_irq_set_type; | |
221 | gc->chip_types[0].regs.ack = OFFSET_TO_REG_CHANGE; | |
222 | gc->chip_types[0].regs.mask = OFFSET_TO_REG_INT_EN; | |
223 | } | |
224 | ||
225 | return 0; | |
c6ce2b6b CR |
226 | } |
227 | ||
b8a51a2e | 228 | static int tb10x_gpio_remove(struct platform_device *pdev) |
c6ce2b6b CR |
229 | { |
230 | struct tb10x_gpio *tb10x_gpio = platform_get_drvdata(pdev); | |
c6ce2b6b CR |
231 | |
232 | if (tb10x_gpio->gc.to_irq) { | |
233 | irq_remove_generic_chip(tb10x_gpio->domain->gc->gc[0], | |
234 | BIT(tb10x_gpio->gc.ngpio) - 1, 0, 0); | |
235 | kfree(tb10x_gpio->domain->gc); | |
236 | irq_domain_remove(tb10x_gpio->domain); | |
c6ce2b6b | 237 | } |
c6ce2b6b CR |
238 | |
239 | return 0; | |
240 | } | |
241 | ||
242 | static const struct of_device_id tb10x_gpio_dt_ids[] = { | |
243 | { .compatible = "abilis,tb10x-gpio" }, | |
244 | { } | |
245 | }; | |
246 | MODULE_DEVICE_TABLE(of, tb10x_gpio_dt_ids); | |
247 | ||
248 | static struct platform_driver tb10x_gpio_driver = { | |
249 | .probe = tb10x_gpio_probe, | |
250 | .remove = tb10x_gpio_remove, | |
251 | .driver = { | |
252 | .name = "tb10x-gpio", | |
b10b45c0 | 253 | .of_match_table = tb10x_gpio_dt_ids, |
c6ce2b6b CR |
254 | } |
255 | }; | |
256 | ||
85aa3915 | 257 | module_platform_driver(tb10x_gpio_driver); |
c6ce2b6b CR |
258 | MODULE_LICENSE("GPL"); |
259 | MODULE_DESCRIPTION("tb10x gpio."); | |
260 | MODULE_VERSION("0.0.1"); |