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Dmitry Baryshkov45528e32008-04-10 13:31:47 +01001/*
2 * linux/arch/arm/mach-sa1100/gpio.c
3 *
4 * Generic SA-1100 GPIO handling
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
Russell King2f8163b2011-07-26 10:53:52 +010010#include <linux/gpio.h>
Dmitry Baryshkov45528e32008-04-10 13:31:47 +010011#include <linux/init.h>
12#include <linux/module.h>
Linus Walleij40ca0612013-09-25 13:33:55 +010013#include <linux/io.h>
Dmitry Eremin-Solenikova0ea298d32015-01-15 02:32:26 +010014#include <linux/syscore_ops.h>
Russell Kinga09e64f2008-08-05 16:14:15 +010015#include <mach/hardware.h>
Rob Herringf314f332012-02-24 00:06:51 +010016#include <mach/irqs.h>
Dmitry Baryshkov45528e32008-04-10 13:31:47 +010017
18static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset)
19{
20 return GPLR & GPIO_GPIO(offset);
21}
22
23static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
24{
25 if (value)
26 GPSR = GPIO_GPIO(offset);
27 else
28 GPCR = GPIO_GPIO(offset);
29}
30
31static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset)
32{
33 unsigned long flags;
34
35 local_irq_save(flags);
36 GPDR &= ~GPIO_GPIO(offset);
37 local_irq_restore(flags);
38 return 0;
39}
40
41static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int value)
42{
43 unsigned long flags;
44
45 local_irq_save(flags);
46 sa1100_gpio_set(chip, offset, value);
47 GPDR |= GPIO_GPIO(offset);
48 local_irq_restore(flags);
49 return 0;
50}
51
Russell Kingf408c982011-12-18 18:24:57 +000052static int sa1100_to_irq(struct gpio_chip *chip, unsigned offset)
53{
Dmitry Eremin-Solenikov83508092015-01-15 02:29:16 +010054 return IRQ_GPIO0 + offset;
Russell Kingf408c982011-12-18 18:24:57 +000055}
56
Dmitry Baryshkov45528e32008-04-10 13:31:47 +010057static struct gpio_chip sa1100_gpio_chip = {
58 .label = "gpio",
59 .direction_input = sa1100_direction_input,
60 .direction_output = sa1100_direction_output,
61 .set = sa1100_gpio_set,
62 .get = sa1100_gpio_get,
Russell Kingf408c982011-12-18 18:24:57 +000063 .to_irq = sa1100_to_irq,
Dmitry Baryshkov45528e32008-04-10 13:31:47 +010064 .base = 0,
65 .ngpio = GPIO_MAX + 1,
66};
67
Dmitry Eremin-Solenikova0ea298d32015-01-15 02:32:26 +010068/*
69 * SA1100 GPIO edge detection for IRQs:
70 * IRQs are generated on Falling-Edge, Rising-Edge, or both.
71 * Use this instead of directly setting GRER/GFER.
72 */
73static int GPIO_IRQ_rising_edge;
74static int GPIO_IRQ_falling_edge;
75static int GPIO_IRQ_mask;
76
77static int sa1100_gpio_type(struct irq_data *d, unsigned int type)
78{
79 unsigned int mask;
80
81 mask = BIT(d->hwirq);
82
83 if (type == IRQ_TYPE_PROBE) {
84 if ((GPIO_IRQ_rising_edge | GPIO_IRQ_falling_edge) & mask)
85 return 0;
86 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
87 }
88
89 if (type & IRQ_TYPE_EDGE_RISING)
90 GPIO_IRQ_rising_edge |= mask;
91 else
92 GPIO_IRQ_rising_edge &= ~mask;
93 if (type & IRQ_TYPE_EDGE_FALLING)
94 GPIO_IRQ_falling_edge |= mask;
95 else
96 GPIO_IRQ_falling_edge &= ~mask;
97
98 GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
99 GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
100
101 return 0;
102}
103
104/*
105 * GPIO IRQs must be acknowledged.
106 */
107static void sa1100_gpio_ack(struct irq_data *d)
108{
109 GEDR = BIT(d->hwirq);
110}
111
112static void sa1100_gpio_mask(struct irq_data *d)
113{
114 unsigned int mask = BIT(d->hwirq);
115
116 GPIO_IRQ_mask &= ~mask;
117
118 GRER &= ~mask;
119 GFER &= ~mask;
120}
121
122static void sa1100_gpio_unmask(struct irq_data *d)
123{
124 unsigned int mask = BIT(d->hwirq);
125
126 GPIO_IRQ_mask |= mask;
127
128 GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
129 GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
130}
131
132static int sa1100_gpio_wake(struct irq_data *d, unsigned int on)
133{
134 if (on)
135 PWER |= BIT(d->hwirq);
136 else
137 PWER &= ~BIT(d->hwirq);
138 return 0;
139}
140
141/*
142 * This is for GPIO IRQs
143 */
144static struct irq_chip sa1100_gpio_irq_chip = {
145 .name = "GPIO",
146 .irq_ack = sa1100_gpio_ack,
147 .irq_mask = sa1100_gpio_mask,
148 .irq_unmask = sa1100_gpio_unmask,
149 .irq_set_type = sa1100_gpio_type,
150 .irq_set_wake = sa1100_gpio_wake,
151};
152
153static int sa1100_gpio_irqdomain_map(struct irq_domain *d,
154 unsigned int irq, irq_hw_number_t hwirq)
155{
156 irq_set_chip_and_handler(irq, &sa1100_gpio_irq_chip,
157 handle_edge_irq);
158 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
159
160 return 0;
161}
162
Krzysztof Kozlowski0b354dc2015-04-27 21:54:07 +0900163static const struct irq_domain_ops sa1100_gpio_irqdomain_ops = {
Dmitry Eremin-Solenikova0ea298d32015-01-15 02:32:26 +0100164 .map = sa1100_gpio_irqdomain_map,
165 .xlate = irq_domain_xlate_onetwocell,
166};
167
168static struct irq_domain *sa1100_gpio_irqdomain;
169
170/*
171 * IRQ 0-11 (GPIO) handler. We enter here with the
172 * irq_controller_lock held, and IRQs disabled. Decode the IRQ
173 * and call the handler.
174 */
175static void
176sa1100_gpio_handler(unsigned int irq, struct irq_desc *desc)
177{
178 unsigned int mask;
179
180 mask = GEDR;
181 do {
182 /*
183 * clear down all currently active IRQ sources.
184 * We will be processing them all.
185 */
186 GEDR = mask;
187
188 irq = IRQ_GPIO0;
189 do {
190 if (mask & 1)
191 generic_handle_irq(irq);
192 mask >>= 1;
193 irq++;
194 } while (mask);
195
196 mask = GEDR;
197 } while (mask);
198}
199
200static int sa1100_gpio_suspend(void)
201{
202 /*
203 * Set the appropriate edges for wakeup.
204 */
205 GRER = PWER & GPIO_IRQ_rising_edge;
206 GFER = PWER & GPIO_IRQ_falling_edge;
207
208 /*
209 * Clear any pending GPIO interrupts.
210 */
211 GEDR = GEDR;
212
213 return 0;
214}
215
216static void sa1100_gpio_resume(void)
217{
218 GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
219 GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
220}
221
222static struct syscore_ops sa1100_gpio_syscore_ops = {
223 .suspend = sa1100_gpio_suspend,
224 .resume = sa1100_gpio_resume,
225};
226
227static int __init sa1100_gpio_init_devicefs(void)
228{
229 register_syscore_ops(&sa1100_gpio_syscore_ops);
230 return 0;
231}
232
233device_initcall(sa1100_gpio_init_devicefs);
234
Dmitry Baryshkov45528e32008-04-10 13:31:47 +0100235void __init sa1100_init_gpio(void)
236{
Dmitry Eremin-Solenikova0ea298d32015-01-15 02:32:26 +0100237 /* clear all GPIO edge detects */
238 GFER = 0;
239 GRER = 0;
240 GEDR = -1;
241
Dmitry Baryshkov45528e32008-04-10 13:31:47 +0100242 gpiochip_add(&sa1100_gpio_chip);
Dmitry Eremin-Solenikova0ea298d32015-01-15 02:32:26 +0100243
244 sa1100_gpio_irqdomain = irq_domain_add_simple(NULL,
245 28, IRQ_GPIO0,
246 &sa1100_gpio_irqdomain_ops, NULL);
247
248 /*
249 * Install handlers for GPIO 0-10 edge detect interrupts
250 */
251 irq_set_chained_handler(IRQ_GPIO0_SC, sa1100_gpio_handler);
252 irq_set_chained_handler(IRQ_GPIO1_SC, sa1100_gpio_handler);
253 irq_set_chained_handler(IRQ_GPIO2_SC, sa1100_gpio_handler);
254 irq_set_chained_handler(IRQ_GPIO3_SC, sa1100_gpio_handler);
255 irq_set_chained_handler(IRQ_GPIO4_SC, sa1100_gpio_handler);
256 irq_set_chained_handler(IRQ_GPIO5_SC, sa1100_gpio_handler);
257 irq_set_chained_handler(IRQ_GPIO6_SC, sa1100_gpio_handler);
258 irq_set_chained_handler(IRQ_GPIO7_SC, sa1100_gpio_handler);
259 irq_set_chained_handler(IRQ_GPIO8_SC, sa1100_gpio_handler);
260 irq_set_chained_handler(IRQ_GPIO9_SC, sa1100_gpio_handler);
261 irq_set_chained_handler(IRQ_GPIO10_SC, sa1100_gpio_handler);
262 /*
263 * Install handler for GPIO 11-27 edge detect interrupts
264 */
265 irq_set_chained_handler(IRQ_GPIO11_27, sa1100_gpio_handler);
266
Dmitry Baryshkov45528e32008-04-10 13:31:47 +0100267}