blob: 7bd9f209ffa81a1b00141d4345f4fe3becc7f317 [file] [log] [blame]
Stefan Agner7f2691a2014-10-16 21:47:58 +02001/*
2 * vf610 GPIO support through PORT and GPIO module
3 *
4 * Copyright (c) 2014 Toradex AG.
5 *
6 * Author: Stefan Agner <stefan@agner.ch>.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
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
18#include <linux/bitops.h>
19#include <linux/err.h>
20#include <linux/gpio.h>
21#include <linux/init.h>
22#include <linux/interrupt.h>
23#include <linux/io.h>
24#include <linux/ioport.h>
25#include <linux/irq.h>
26#include <linux/module.h>
27#include <linux/platform_device.h>
28#include <linux/of.h>
29#include <linux/of_device.h>
30#include <linux/of_irq.h>
31
32#define VF610_GPIO_PER_PORT 32
33
34struct vf610_gpio_port {
35 struct gpio_chip gc;
36 void __iomem *base;
37 void __iomem *gpio_base;
38 u8 irqc[VF610_GPIO_PER_PORT];
39 int irq;
40};
41
42#define GPIO_PDOR 0x00
43#define GPIO_PSOR 0x04
44#define GPIO_PCOR 0x08
45#define GPIO_PTOR 0x0c
46#define GPIO_PDIR 0x10
47
48#define PORT_PCR(n) ((n) * 0x4)
49#define PORT_PCR_IRQC_OFFSET 16
50
51#define PORT_ISFR 0xa0
52#define PORT_DFER 0xc0
53#define PORT_DFCR 0xc4
54#define PORT_DFWR 0xc8
55
56#define PORT_INT_OFF 0x0
57#define PORT_INT_LOGIC_ZERO 0x8
58#define PORT_INT_RISING_EDGE 0x9
59#define PORT_INT_FALLING_EDGE 0xa
60#define PORT_INT_EITHER_EDGE 0xb
61#define PORT_INT_LOGIC_ONE 0xc
62
63static const struct of_device_id vf610_gpio_dt_ids[] = {
64 { .compatible = "fsl,vf610-gpio" },
65 { /* sentinel */ }
66};
67
68static inline void vf610_gpio_writel(u32 val, void __iomem *reg)
69{
70 writel_relaxed(val, reg);
71}
72
73static inline u32 vf610_gpio_readl(void __iomem *reg)
74{
75 return readl_relaxed(reg);
76}
77
78static int vf610_gpio_request(struct gpio_chip *chip, unsigned offset)
79{
80 return pinctrl_request_gpio(chip->base + offset);
81}
82
83static void vf610_gpio_free(struct gpio_chip *chip, unsigned offset)
84{
85 pinctrl_free_gpio(chip->base + offset);
86}
87
88static int vf610_gpio_get(struct gpio_chip *gc, unsigned int gpio)
89{
90 struct vf610_gpio_port *port =
91 container_of(gc, struct vf610_gpio_port, gc);
92
93 return !!(vf610_gpio_readl(port->gpio_base + GPIO_PDIR) & BIT(gpio));
94}
95
96static void vf610_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
97{
98 struct vf610_gpio_port *port =
99 container_of(gc, struct vf610_gpio_port, gc);
100 unsigned long mask = BIT(gpio);
101
102 if (val)
103 vf610_gpio_writel(mask, port->gpio_base + GPIO_PSOR);
104 else
105 vf610_gpio_writel(mask, port->gpio_base + GPIO_PCOR);
106}
107
108static int vf610_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
109{
110 return pinctrl_gpio_direction_input(chip->base + gpio);
111}
112
113static int vf610_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
114 int value)
115{
116 vf610_gpio_set(chip, gpio, value);
117
118 return pinctrl_gpio_direction_output(chip->base + gpio);
119}
120
121static void vf610_gpio_irq_handler(u32 irq, struct irq_desc *desc)
122{
123 struct vf610_gpio_port *port = irq_get_handler_data(irq);
124 struct irq_chip *chip = irq_desc_get_chip(desc);
125 int pin;
126 unsigned long irq_isfr;
127
128 chained_irq_enter(chip, desc);
129
130 irq_isfr = vf610_gpio_readl(port->base + PORT_ISFR);
131
132 for_each_set_bit(pin, &irq_isfr, VF610_GPIO_PER_PORT) {
133 vf610_gpio_writel(BIT(pin), port->base + PORT_ISFR);
134
135 generic_handle_irq(irq_find_mapping(port->gc.irqdomain, pin));
136 }
137
138 chained_irq_exit(chip, desc);
139}
140
141static void vf610_gpio_irq_ack(struct irq_data *d)
142{
143 struct vf610_gpio_port *port = irq_data_get_irq_chip_data(d);
144 int gpio = d->hwirq;
145
146 vf610_gpio_writel(BIT(gpio), port->base + PORT_ISFR);
147}
148
149static int vf610_gpio_irq_set_type(struct irq_data *d, u32 type)
150{
151 struct vf610_gpio_port *port = irq_data_get_irq_chip_data(d);
152 u8 irqc;
153
154 switch (type) {
155 case IRQ_TYPE_EDGE_RISING:
156 irqc = PORT_INT_RISING_EDGE;
157 break;
158 case IRQ_TYPE_EDGE_FALLING:
159 irqc = PORT_INT_FALLING_EDGE;
160 break;
161 case IRQ_TYPE_EDGE_BOTH:
162 irqc = PORT_INT_EITHER_EDGE;
163 break;
164 case IRQ_TYPE_LEVEL_LOW:
165 irqc = PORT_INT_LOGIC_ZERO;
166 break;
167 case IRQ_TYPE_LEVEL_HIGH:
168 irqc = PORT_INT_LOGIC_ONE;
169 break;
170 default:
171 return -EINVAL;
172 }
173
174 port->irqc[d->hwirq] = irqc;
175
176 return 0;
177}
178
179static void vf610_gpio_irq_mask(struct irq_data *d)
180{
181 struct vf610_gpio_port *port = irq_data_get_irq_chip_data(d);
182 void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);
183
184 vf610_gpio_writel(0, pcr_base);
185}
186
187static void vf610_gpio_irq_unmask(struct irq_data *d)
188{
189 struct vf610_gpio_port *port = irq_data_get_irq_chip_data(d);
190 void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);
191
192 vf610_gpio_writel(port->irqc[d->hwirq] << PORT_PCR_IRQC_OFFSET,
193 pcr_base);
194}
195
196static int vf610_gpio_irq_set_wake(struct irq_data *d, u32 enable)
197{
198 struct vf610_gpio_port *port = irq_data_get_irq_chip_data(d);
199
200 if (enable)
201 enable_irq_wake(port->irq);
202 else
203 disable_irq_wake(port->irq);
204
205 return 0;
206}
207
208static struct irq_chip vf610_gpio_irq_chip = {
209 .name = "gpio-vf610",
210 .irq_ack = vf610_gpio_irq_ack,
211 .irq_mask = vf610_gpio_irq_mask,
212 .irq_unmask = vf610_gpio_irq_unmask,
213 .irq_set_type = vf610_gpio_irq_set_type,
214 .irq_set_wake = vf610_gpio_irq_set_wake,
215};
216
217static int vf610_gpio_probe(struct platform_device *pdev)
218{
219 struct device *dev = &pdev->dev;
220 struct device_node *np = dev->of_node;
221 struct vf610_gpio_port *port;
222 struct resource *iores;
223 struct gpio_chip *gc;
224 int ret;
225
226 port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
227 if (!port)
228 return -ENOMEM;
229
230 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
231 port->base = devm_ioremap_resource(dev, iores);
232 if (IS_ERR(port->base))
233 return PTR_ERR(port->base);
234
235 iores = platform_get_resource(pdev, IORESOURCE_MEM, 1);
236 port->gpio_base = devm_ioremap_resource(dev, iores);
237 if (IS_ERR(port->gpio_base))
238 return PTR_ERR(port->gpio_base);
239
240 port->irq = platform_get_irq(pdev, 0);
241 if (port->irq < 0)
242 return port->irq;
243
244 gc = &port->gc;
245 gc->of_node = np;
246 gc->dev = dev;
Axel Lind32efe32015-02-13 21:04:42 +0800247 gc->label = "vf610-gpio";
248 gc->ngpio = VF610_GPIO_PER_PORT;
Stefan Agner7f2691a2014-10-16 21:47:58 +0200249 gc->base = of_alias_get_id(np, "gpio") * VF610_GPIO_PER_PORT;
250
Axel Lind32efe32015-02-13 21:04:42 +0800251 gc->request = vf610_gpio_request;
252 gc->free = vf610_gpio_free;
253 gc->direction_input = vf610_gpio_direction_input;
254 gc->get = vf610_gpio_get;
255 gc->direction_output = vf610_gpio_direction_output;
256 gc->set = vf610_gpio_set;
Stefan Agner7f2691a2014-10-16 21:47:58 +0200257
258 ret = gpiochip_add(gc);
259 if (ret < 0)
260 return ret;
261
262 /* Clear the interrupt status register for all GPIO's */
263 vf610_gpio_writel(~0, port->base + PORT_ISFR);
264
265 ret = gpiochip_irqchip_add(gc, &vf610_gpio_irq_chip, 0,
266 handle_simple_irq, IRQ_TYPE_NONE);
267 if (ret) {
268 dev_err(dev, "failed to add irqchip\n");
269 gpiochip_remove(gc);
270 return ret;
271 }
272 gpiochip_set_chained_irqchip(gc, &vf610_gpio_irq_chip, port->irq,
273 vf610_gpio_irq_handler);
274
275 return 0;
276}
277
278static struct platform_driver vf610_gpio_driver = {
279 .driver = {
280 .name = "gpio-vf610",
Stefan Agner7f2691a2014-10-16 21:47:58 +0200281 .of_match_table = vf610_gpio_dt_ids,
282 },
283 .probe = vf610_gpio_probe,
284};
285
286static int __init gpio_vf610_init(void)
287{
288 return platform_driver_register(&vf610_gpio_driver);
289}
290device_initcall(gpio_vf610_init);
291
292MODULE_AUTHOR("Stefan Agner <stefan@agner.ch>");
293MODULE_DESCRIPTION("Freescale VF610 GPIO");
294MODULE_LICENSE("GPL v2");