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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
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 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/kernel.h>
21#include <linux/mm.h>
22#include <linux/init.h>
Andrew Victor20118ff2007-10-15 14:27:41 +010023#include <linux/debugfs.h>
24#include <linux/seq_file.h>
Andrew Victor8a87a992007-05-14 14:30:15 +010025#include <linux/module.h>
26
27#include <asm/io.h>
Russell Kinga09e64f2008-08-05 16:14:15 +010028#include <mach/hardware.h>
Andrew Victor8a87a992007-05-14 14:30:15 +010029#include <asm/mach/irq.h>
30
Russell Kinga09e64f2008-08-05 16:14:15 +010031#include <mach/regs-gpio.h>
32#include <mach/gpio.h>
Andrew Victor8a87a992007-05-14 14:30:15 +010033
34/*
35 * Configure a GPIO line for either GPIO function, or its internal
36 * function (Interrupt, Timer, etc).
37 */
38static void __init_or_module ks8695_gpio_mode(unsigned int pin, short gpio)
39{
40 unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
41 unsigned long x, flags;
42
43 if (pin > KS8695_GPIO_5) /* only GPIO 0..5 have internal functions */
44 return;
45
46 local_irq_save(flags);
47
48 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
49 if (gpio) /* GPIO: set bit to 0 */
50 x &= ~enable[pin];
51 else /* Internal function: set bit to 1 */
52 x |= enable[pin];
53 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPC);
54
55 local_irq_restore(flags);
56}
57
58
59static unsigned short gpio_irq[] = { KS8695_IRQ_EXTERN0, KS8695_IRQ_EXTERN1, KS8695_IRQ_EXTERN2, KS8695_IRQ_EXTERN3 };
60
61/*
62 * Configure GPIO pin as external interrupt source.
63 */
64int __init_or_module ks8695_gpio_interrupt(unsigned int pin, unsigned int type)
65{
66 unsigned long x, flags;
67
68 if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */
69 return -EINVAL;
70
71 local_irq_save(flags);
72
73 /* set pin as input */
74 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
75 x &= ~IOPM_(pin);
76 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
77
78 local_irq_restore(flags);
79
80 /* Set IRQ triggering type */
81 set_irq_type(gpio_irq[pin], type);
82
83 /* enable interrupt mode */
84 ks8695_gpio_mode(pin, 0);
85
86 return 0;
87}
88EXPORT_SYMBOL(ks8695_gpio_interrupt);
89
90
91
92/* .... Generic GPIO interface .............................................. */
93
94/*
95 * Configure the GPIO line as an input.
96 */
97int __init_or_module gpio_direction_input(unsigned int pin)
98{
99 unsigned long x, flags;
100
101 if (pin > KS8695_GPIO_15)
102 return -EINVAL;
103
104 /* set pin to GPIO mode */
105 ks8695_gpio_mode(pin, 1);
106
107 local_irq_save(flags);
108
109 /* set pin as input */
110 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
111 x &= ~IOPM_(pin);
112 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
113
114 local_irq_restore(flags);
115
116 return 0;
117}
118EXPORT_SYMBOL(gpio_direction_input);
119
120
121/*
122 * Configure the GPIO line as an output, with default state.
123 */
124int __init_or_module gpio_direction_output(unsigned int pin, unsigned int state)
125{
126 unsigned long x, flags;
127
128 if (pin > KS8695_GPIO_15)
129 return -EINVAL;
130
131 /* set pin to GPIO mode */
132 ks8695_gpio_mode(pin, 1);
133
134 local_irq_save(flags);
135
136 /* set line state */
137 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
138 if (state)
139 x |= (1 << pin);
140 else
141 x &= ~(1 << pin);
142 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
143
144 /* set pin as output */
145 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
146 x |= IOPM_(pin);
147 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
148
149 local_irq_restore(flags);
150
151 return 0;
152}
153EXPORT_SYMBOL(gpio_direction_output);
154
155
156/*
157 * Set the state of an output GPIO line.
158 */
159void gpio_set_value(unsigned int pin, unsigned int state)
160{
161 unsigned long x, flags;
162
163 if (pin > KS8695_GPIO_15)
164 return;
165
166 local_irq_save(flags);
167
168 /* set output line state */
169 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
170 if (state)
171 x |= (1 << pin);
172 else
173 x &= ~(1 << pin);
174 __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
175
176 local_irq_restore(flags);
177}
178EXPORT_SYMBOL(gpio_set_value);
179
180
181/*
182 * Read the state of a GPIO line.
183 */
184int gpio_get_value(unsigned int pin)
185{
186 unsigned long x;
187
188 if (pin > KS8695_GPIO_15)
189 return -EINVAL;
190
191 x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
192 return (x & (1 << pin)) != 0;
193}
194EXPORT_SYMBOL(gpio_get_value);
195
196
197/*
198 * Map GPIO line to IRQ number.
199 */
200int gpio_to_irq(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}
207EXPORT_SYMBOL(gpio_to_irq);
208
209
210/*
211 * Map IRQ number to GPIO line.
212 */
213int irq_to_gpio(unsigned int irq)
214{
215 if ((irq < KS8695_IRQ_EXTERN0) || (irq > KS8695_IRQ_EXTERN3))
216 return -EINVAL;
217
218 return (irq - KS8695_IRQ_EXTERN0);
219}
220EXPORT_SYMBOL(irq_to_gpio);
Andrew Victor20118ff2007-10-15 14:27:41 +0100221
222
223/* .... Debug interface ..................................................... */
224
225#ifdef CONFIG_DEBUG_FS
226
227static int ks8695_gpio_show(struct seq_file *s, void *unused)
228{
229 unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
230 unsigned int intmask[] = { IOPC_IOEINT0TM, IOPC_IOEINT1TM, IOPC_IOEINT2TM, IOPC_IOEINT3TM };
231 unsigned long mode, ctrl, data;
232 int i;
233
234 mode = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
235 ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
236 data = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
237
238 seq_printf(s, "Pin\tI/O\tFunction\tState\n\n");
239
240 for (i = KS8695_GPIO_0; i <= KS8695_GPIO_15 ; i++) {
241 seq_printf(s, "%i:\t", i);
242
243 seq_printf(s, "%s\t", (mode & IOPM_(i)) ? "Output" : "Input");
244
245 if (i <= KS8695_GPIO_3) {
246 if (ctrl & enable[i]) {
247 seq_printf(s, "EXT%i ", i);
248
249 switch ((ctrl & intmask[i]) >> (4 * i)) {
250 case IOPC_TM_LOW:
251 seq_printf(s, "(Low)"); break;
252 case IOPC_TM_HIGH:
253 seq_printf(s, "(High)"); break;
254 case IOPC_TM_RISING:
255 seq_printf(s, "(Rising)"); break;
256 case IOPC_TM_FALLING:
257 seq_printf(s, "(Falling)"); break;
258 case IOPC_TM_EDGE:
259 seq_printf(s, "(Edges)"); break;
260 }
261 }
262 else
263 seq_printf(s, "GPIO\t");
264 }
265 else if (i <= KS8695_GPIO_5) {
266 if (ctrl & enable[i])
267 seq_printf(s, "TOUT%i\t", i - KS8695_GPIO_4);
268 else
269 seq_printf(s, "GPIO\t");
270 }
271 else
272 seq_printf(s, "GPIO\t");
273
274 seq_printf(s, "\t");
275
276 seq_printf(s, "%i\n", (data & IOPD_(i)) ? 1 : 0);
277 }
278 return 0;
279}
280
281static int ks8695_gpio_open(struct inode *inode, struct file *file)
282{
283 return single_open(file, ks8695_gpio_show, NULL);
284}
285
286static const struct file_operations ks8695_gpio_operations = {
287 .open = ks8695_gpio_open,
288 .read = seq_read,
289 .llseek = seq_lseek,
290 .release = single_release,
291};
292
293static int __init ks8695_gpio_debugfs_init(void)
294{
295 /* /sys/kernel/debug/ks8695_gpio */
296 (void) debugfs_create_file("ks8695_gpio", S_IFREG | S_IRUGO, NULL, NULL, &ks8695_gpio_operations);
297 return 0;
298}
299postcore_initcall(ks8695_gpio_debugfs_init);
300
301#endif