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1/*
2 * arch/arm/mach-ks8695/gpio.c
3 *
4 * Copyright (C) 2006 Andrew Victor
5 * Updated to GPIOLIB, Copyright 2008 Simtec Electronics
6 * Daniel Silverstone <dsilvers@simtec.co.uk>
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#include <linux/gpio/driver.h>
22#include <linux/kernel.h>
23#include <linux/mm.h>
24#include <linux/init.h>
25#include <linux/debugfs.h>
26#include <linux/seq_file.h>
27#include <linux/module.h>
28#include <linux/io.h>
29
30#include <mach/hardware.h>
31#include <asm/mach/irq.h>
32
33#include <mach/regs-gpio.h>
34#include <mach/gpio-ks8695.h>
35
36/*
37 * Configure a GPIO line for either GPIO function, or its internal
38 * function (Interrupt, Timer, etc).
39 */
40static void ks8695_gpio_mode(unsigned int pin, short gpio)
41{
42 unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
43 unsigned long x, flags;
44
45 if (pin > KS8695_GPIO_5) /* only GPIO 0..5 have internal functions */
46 return;
47
48 local_irq_save(flags);
49
50 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
51 if (gpio) /* GPIO: set bit to 0 */
52 x &= ~enable[pin];
53 else /* Internal function: set bit to 1 */
54 x |= enable[pin];
55 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPC);
56
57 local_irq_restore(flags);
58}
59
60
61static unsigned short gpio_irq[] = { KS8695_IRQ_EXTERN0, KS8695_IRQ_EXTERN1, KS8695_IRQ_EXTERN2, KS8695_IRQ_EXTERN3 };
62
63/*
64 * Configure GPIO pin as external interrupt source.
65 */
66int ks8695_gpio_interrupt(unsigned int pin, unsigned int type)
67{
68 unsigned long x, flags;
69
70 if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */
71 return -EINVAL;
72
73 local_irq_save(flags);
74
75 /* set pin as input */
76 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
77 x &= ~IOPM(pin);
78 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
79
80 local_irq_restore(flags);
81
82 /* Set IRQ triggering type */
83 irq_set_irq_type(gpio_irq[pin], type);
84
85 /* enable interrupt mode */
86 ks8695_gpio_mode(pin, 0);
87
88 return 0;
89}
90EXPORT_SYMBOL(ks8695_gpio_interrupt);
91
92
93
94/* .... Generic GPIO interface .............................................. */
95
96/*
97 * Configure the GPIO line as an input.
98 */
99static int ks8695_gpio_direction_input(struct gpio_chip *gc, unsigned int pin)
100{
101 unsigned long x, flags;
102
103 if (pin > KS8695_GPIO_15)
104 return -EINVAL;
105
106 /* set pin to GPIO mode */
107 ks8695_gpio_mode(pin, 1);
108
109 local_irq_save(flags);
110
111 /* set pin as input */
112 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
113 x &= ~IOPM(pin);
114 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
115
116 local_irq_restore(flags);
117
118 return 0;
119}
120
121
122/*
123 * Configure the GPIO line as an output, with default state.
124 */
125static int ks8695_gpio_direction_output(struct gpio_chip *gc,
126 unsigned int pin, int state)
127{
128 unsigned long x, flags;
129
130 if (pin > KS8695_GPIO_15)
131 return -EINVAL;
132
133 /* set pin to GPIO mode */
134 ks8695_gpio_mode(pin, 1);
135
136 local_irq_save(flags);
137
138 /* set line state */
139 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
140 if (state)
141 x |= IOPD(pin);
142 else
143 x &= ~IOPD(pin);
144 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
145
146 /* set pin as output */
147 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
148 x |= IOPM(pin);
149 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
150
151 local_irq_restore(flags);
152
153 return 0;
154}
155
156
157/*
158 * Set the state of an output GPIO line.
159 */
160static void ks8695_gpio_set_value(struct gpio_chip *gc,
161 unsigned int pin, int state)
162{
163 unsigned long x, flags;
164
165 if (pin > KS8695_GPIO_15)
166 return;
167
168 local_irq_save(flags);
169
170 /* set output line state */
171 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
172 if (state)
173 x |= IOPD(pin);
174 else
175 x &= ~IOPD(pin);
176 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
177
178 local_irq_restore(flags);
179}
180
181
182/*
183 * Read the state of a GPIO line.
184 */
185static int ks8695_gpio_get_value(struct gpio_chip *gc, unsigned int pin)
186{
187 unsigned long x;
188
189 if (pin > KS8695_GPIO_15)
190 return -EINVAL;
191
192 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
193 return (x & IOPD(pin)) != 0;
194}
195
196
197/*
198 * Map GPIO line to IRQ number.
199 */
200static int ks8695_gpio_to_irq(struct gpio_chip *gc, unsigned int pin)
201{
202 if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */
203 return -EINVAL;
204
205 return gpio_irq[pin];
206}
207
208/* GPIOLIB interface */
209
210static struct gpio_chip ks8695_gpio_chip = {
211 .label = "KS8695",
212 .direction_input = ks8695_gpio_direction_input,
213 .direction_output = ks8695_gpio_direction_output,
214 .get = ks8695_gpio_get_value,
215 .set = ks8695_gpio_set_value,
216 .to_irq = ks8695_gpio_to_irq,
217 .base = 0,
218 .ngpio = 16,
219 .can_sleep = false,
220};
221
222/* Register the GPIOs */
223void ks8695_register_gpios(void)
224{
225 if (gpiochip_add_data(&ks8695_gpio_chip, NULL))
226 printk(KERN_ERR "Unable to register core GPIOs\n");
227}
228
229/* .... Debug interface ..................................................... */
230
231#ifdef CONFIG_DEBUG_FS
232
233static int ks8695_gpio_show(struct seq_file *s, void *unused)
234{
235 unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
236 unsigned int intmask[] = { IOPC_IOEINT0TM, IOPC_IOEINT1TM, IOPC_IOEINT2TM, IOPC_IOEINT3TM };
237 unsigned long mode, ctrl, data;
238 int i;
239
240 mode = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
241 ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
242 data = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
243
244 seq_printf(s, "Pin\tI/O\tFunction\tState\n\n");
245
246 for (i = KS8695_GPIO_0; i <= KS8695_GPIO_15 ; i++) {
247 seq_printf(s, "%i:\t", i);
248
249 seq_printf(s, "%s\t", (mode & IOPM(i)) ? "Output" : "Input");
250
251 if (i <= KS8695_GPIO_3) {
252 if (ctrl & enable[i]) {
253 seq_printf(s, "EXT%i ", i);
254
255 switch ((ctrl & intmask[i]) >> (4 * i)) {
256 case IOPC_TM_LOW:
257 seq_printf(s, "(Low)"); break;
258 case IOPC_TM_HIGH:
259 seq_printf(s, "(High)"); break;
260 case IOPC_TM_RISING:
261 seq_printf(s, "(Rising)"); break;
262 case IOPC_TM_FALLING:
263 seq_printf(s, "(Falling)"); break;
264 case IOPC_TM_EDGE:
265 seq_printf(s, "(Edges)"); break;
266 }
267 } else
268 seq_printf(s, "GPIO\t");
269 } else if (i <= KS8695_GPIO_5) {
270 if (ctrl & enable[i])
271 seq_printf(s, "TOUT%i\t", i - KS8695_GPIO_4);
272 else
273 seq_printf(s, "GPIO\t");
274 } else {
275 seq_printf(s, "GPIO\t");
276 }
277
278 seq_printf(s, "\t");
279
280 seq_printf(s, "%i\n", (data & IOPD(i)) ? 1 : 0);
281 }
282 return 0;
283}
284
285DEFINE_SHOW_ATTRIBUTE(ks8695_gpio);
286
287static int __init ks8695_gpio_debugfs_init(void)
288{
289 /* /sys/kernel/debug/ks8695_gpio */
290 debugfs_create_file("ks8695_gpio", S_IFREG | S_IRUGO, NULL, NULL,
291 &ks8695_gpio_fops);
292 return 0;
293}
294postcore_initcall(ks8695_gpio_debugfs_init);
295
296#endif
297

Warning: That file was not part of the compilation database. It may have many parsing errors.