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Andrew Victor8a87a992007-05-14 14:30:15 +01001/*
2 * arch/arm/mach-ks8695/gpio.c
3 *
4 * Copyright (C) 2006 Andrew Victor
Daniel Silverstone72880ad2008-12-13 20:44:12 +00005 * Updated to GPIOLIB, Copyright 2008 Simtec Electronics
6 * Daniel Silverstone <dsilvers@simtec.co.uk>
Andrew Victor8a87a992007-05-14 14:30:15 +01007 *
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 */
Russell King2f8163b2011-07-26 10:53:52 +010021#include <linux/gpio.h>
Andrew Victor8a87a992007-05-14 14:30:15 +010022#include <linux/kernel.h>
23#include <linux/mm.h>
24#include <linux/init.h>
Andrew Victor20118ff2007-10-15 14:27:41 +010025#include <linux/debugfs.h>
26#include <linux/seq_file.h>
Andrew Victor8a87a992007-05-14 14:30:15 +010027#include <linux/module.h>
Russell Kingfced80c2008-09-06 12:10:45 +010028#include <linux/io.h>
Andrew Victor8a87a992007-05-14 14:30:15 +010029
Russell Kinga09e64f2008-08-05 16:14:15 +010030#include <mach/hardware.h>
Andrew Victor8a87a992007-05-14 14:30:15 +010031#include <asm/mach/irq.h>
32
Russell Kinga09e64f2008-08-05 16:14:15 +010033#include <mach/regs-gpio.h>
Linus Walleije24e4492011-08-22 08:37:38 +010034#include <mach/gpio-ks8695.h>
Andrew Victor8a87a992007-05-14 14:30:15 +010035
36/*
37 * Configure a GPIO line for either GPIO function, or its internal
38 * function (Interrupt, Timer, etc).
39 */
Daniel Silverstone72880ad2008-12-13 20:44:12 +000040static void ks8695_gpio_mode(unsigned int pin, short gpio)
Andrew Victor8a87a992007-05-14 14:30:15 +010041{
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 */
Daniel Silverstone72880ad2008-12-13 20:44:12 +000066int ks8695_gpio_interrupt(unsigned int pin, unsigned int type)
Andrew Victor8a87a992007-05-14 14:30:15 +010067{
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);
Andrew Victor8d163b32008-10-07 20:20:15 +010077 x &= ~IOPM(pin);
Andrew Victor8a87a992007-05-14 14:30:15 +010078 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
79
80 local_irq_restore(flags);
81
82 /* Set IRQ triggering type */
Thomas Gleixner6845664a2011-03-24 13:25:22 +010083 irq_set_irq_type(gpio_irq[pin], type);
Andrew Victor8a87a992007-05-14 14:30:15 +010084
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 */
Daniel Silverstone72880ad2008-12-13 20:44:12 +000099static int ks8695_gpio_direction_input(struct gpio_chip *gc, unsigned int pin)
Andrew Victor8a87a992007-05-14 14:30:15 +0100100{
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);
Andrew Victor8d163b32008-10-07 20:20:15 +0100113 x &= ~IOPM(pin);
Andrew Victor8a87a992007-05-14 14:30:15 +0100114 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
115
116 local_irq_restore(flags);
117
118 return 0;
119}
Andrew Victor8a87a992007-05-14 14:30:15 +0100120
121
122/*
123 * Configure the GPIO line as an output, with default state.
124 */
Daniel Silverstone72880ad2008-12-13 20:44:12 +0000125static int ks8695_gpio_direction_output(struct gpio_chip *gc,
126 unsigned int pin, int state)
Andrew Victor8a87a992007-05-14 14:30:15 +0100127{
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)
Andrew Victor8d163b32008-10-07 20:20:15 +0100141 x |= IOPD(pin);
Andrew Victor8a87a992007-05-14 14:30:15 +0100142 else
Andrew Victor8d163b32008-10-07 20:20:15 +0100143 x &= ~IOPD(pin);
Andrew Victor8a87a992007-05-14 14:30:15 +0100144 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
145
146 /* set pin as output */
147 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
Andrew Victor8d163b32008-10-07 20:20:15 +0100148 x |= IOPM(pin);
Andrew Victor8a87a992007-05-14 14:30:15 +0100149 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
150
151 local_irq_restore(flags);
152
153 return 0;
154}
Andrew Victor8a87a992007-05-14 14:30:15 +0100155
156
157/*
158 * Set the state of an output GPIO line.
159 */
Daniel Silverstone72880ad2008-12-13 20:44:12 +0000160static void ks8695_gpio_set_value(struct gpio_chip *gc,
161 unsigned int pin, int state)
Andrew Victor8a87a992007-05-14 14:30:15 +0100162{
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)
Andrew Victor8d163b32008-10-07 20:20:15 +0100173 x |= IOPD(pin);
Andrew Victor8a87a992007-05-14 14:30:15 +0100174 else
Andrew Victor8d163b32008-10-07 20:20:15 +0100175 x &= ~IOPD(pin);
Andrew Victor8a87a992007-05-14 14:30:15 +0100176 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
177
178 local_irq_restore(flags);
179}
Andrew Victor8a87a992007-05-14 14:30:15 +0100180
181
182/*
183 * Read the state of a GPIO line.
184 */
Daniel Silverstone72880ad2008-12-13 20:44:12 +0000185static int ks8695_gpio_get_value(struct gpio_chip *gc, unsigned int pin)
Andrew Victor8a87a992007-05-14 14:30:15 +0100186{
187 unsigned long x;
188
189 if (pin > KS8695_GPIO_15)
190 return -EINVAL;
191
192 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
Andrew Victor8d163b32008-10-07 20:20:15 +0100193 return (x & IOPD(pin)) != 0;
Andrew Victor8a87a992007-05-14 14:30:15 +0100194}
Andrew Victor8a87a992007-05-14 14:30:15 +0100195
196
197/*
198 * Map GPIO line to IRQ number.
199 */
Ben Dooks7ef71322008-12-13 20:44:13 +0000200static int ks8695_gpio_to_irq(struct gpio_chip *gc, unsigned int pin)
Andrew Victor8a87a992007-05-14 14:30:15 +0100201{
202 if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */
203 return -EINVAL;
204
205 return gpio_irq[pin];
206}
Andrew Victor8a87a992007-05-14 14:30:15 +0100207
208/*
209 * Map IRQ number to GPIO line.
210 */
211int irq_to_gpio(unsigned int irq)
212{
213 if ((irq < KS8695_IRQ_EXTERN0) || (irq > KS8695_IRQ_EXTERN3))
214 return -EINVAL;
215
216 return (irq - KS8695_IRQ_EXTERN0);
217}
218EXPORT_SYMBOL(irq_to_gpio);
Andrew Victor20118ff2007-10-15 14:27:41 +0100219
Daniel Silverstone72880ad2008-12-13 20:44:12 +0000220/* GPIOLIB interface */
221
222static struct gpio_chip ks8695_gpio_chip = {
223 .label = "KS8695",
224 .direction_input = ks8695_gpio_direction_input,
225 .direction_output = ks8695_gpio_direction_output,
226 .get = ks8695_gpio_get_value,
227 .set = ks8695_gpio_set_value,
Ben Dooks7ef71322008-12-13 20:44:13 +0000228 .to_irq = ks8695_gpio_to_irq,
Daniel Silverstone72880ad2008-12-13 20:44:12 +0000229 .base = 0,
230 .ngpio = 16,
231 .can_sleep = 0,
232};
233
234/* Register the GPIOs */
235void ks8695_register_gpios(void)
236{
237 if (gpiochip_add(&ks8695_gpio_chip))
238 printk(KERN_ERR "Unable to register core GPIOs\n");
239}
Andrew Victor20118ff2007-10-15 14:27:41 +0100240
241/* .... Debug interface ..................................................... */
242
243#ifdef CONFIG_DEBUG_FS
244
245static int ks8695_gpio_show(struct seq_file *s, void *unused)
246{
247 unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
248 unsigned int intmask[] = { IOPC_IOEINT0TM, IOPC_IOEINT1TM, IOPC_IOEINT2TM, IOPC_IOEINT3TM };
249 unsigned long mode, ctrl, data;
250 int i;
251
252 mode = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
253 ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
254 data = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
255
256 seq_printf(s, "Pin\tI/O\tFunction\tState\n\n");
257
258 for (i = KS8695_GPIO_0; i <= KS8695_GPIO_15 ; i++) {
259 seq_printf(s, "%i:\t", i);
260
Andrew Victor8d163b32008-10-07 20:20:15 +0100261 seq_printf(s, "%s\t", (mode & IOPM(i)) ? "Output" : "Input");
Andrew Victor20118ff2007-10-15 14:27:41 +0100262
263 if (i <= KS8695_GPIO_3) {
264 if (ctrl & enable[i]) {
265 seq_printf(s, "EXT%i ", i);
266
267 switch ((ctrl & intmask[i]) >> (4 * i)) {
268 case IOPC_TM_LOW:
269 seq_printf(s, "(Low)"); break;
270 case IOPC_TM_HIGH:
271 seq_printf(s, "(High)"); break;
272 case IOPC_TM_RISING:
273 seq_printf(s, "(Rising)"); break;
274 case IOPC_TM_FALLING:
275 seq_printf(s, "(Falling)"); break;
276 case IOPC_TM_EDGE:
277 seq_printf(s, "(Edges)"); break;
278 }
279 }
280 else
281 seq_printf(s, "GPIO\t");
282 }
283 else if (i <= KS8695_GPIO_5) {
284 if (ctrl & enable[i])
285 seq_printf(s, "TOUT%i\t", i - KS8695_GPIO_4);
286 else
287 seq_printf(s, "GPIO\t");
288 }
289 else
290 seq_printf(s, "GPIO\t");
291
292 seq_printf(s, "\t");
293
Andrew Victor8d163b32008-10-07 20:20:15 +0100294 seq_printf(s, "%i\n", (data & IOPD(i)) ? 1 : 0);
Andrew Victor20118ff2007-10-15 14:27:41 +0100295 }
296 return 0;
297}
298
299static int ks8695_gpio_open(struct inode *inode, struct file *file)
300{
301 return single_open(file, ks8695_gpio_show, NULL);
302}
303
304static const struct file_operations ks8695_gpio_operations = {
305 .open = ks8695_gpio_open,
306 .read = seq_read,
307 .llseek = seq_lseek,
308 .release = single_release,
309};
310
311static int __init ks8695_gpio_debugfs_init(void)
312{
313 /* /sys/kernel/debug/ks8695_gpio */
314 (void) debugfs_create_file("ks8695_gpio", S_IFREG | S_IRUGO, NULL, NULL, &ks8695_gpio_operations);
315 return 0;
316}
317postcore_initcall(ks8695_gpio_debugfs_init);
318
319#endif