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8a87a996 AV |
1 | /* |
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> | |
20118ff9 AV |
23 | #include <linux/debugfs.h> |
24 | #include <linux/seq_file.h> | |
8a87a996 AV |
25 | #include <linux/module.h> |
26 | ||
27 | #include <asm/io.h> | |
a09e64fb | 28 | #include <mach/hardware.h> |
8a87a996 AV |
29 | #include <asm/mach/irq.h> |
30 | ||
a09e64fb RK |
31 | #include <mach/regs-gpio.h> |
32 | #include <mach/gpio.h> | |
8a87a996 AV |
33 | |
34 | /* | |
35 | * Configure a GPIO line for either GPIO function, or its internal | |
36 | * function (Interrupt, Timer, etc). | |
37 | */ | |
38 | static 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 | ||
59 | static 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 | */ | |
64 | int __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 | } | |
88 | EXPORT_SYMBOL(ks8695_gpio_interrupt); | |
89 | ||
90 | ||
91 | ||
92 | /* .... Generic GPIO interface .............................................. */ | |
93 | ||
94 | /* | |
95 | * Configure the GPIO line as an input. | |
96 | */ | |
97 | int __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 | } | |
118 | EXPORT_SYMBOL(gpio_direction_input); | |
119 | ||
120 | ||
121 | /* | |
122 | * Configure the GPIO line as an output, with default state. | |
123 | */ | |
124 | int __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 | } | |
153 | EXPORT_SYMBOL(gpio_direction_output); | |
154 | ||
155 | ||
156 | /* | |
157 | * Set the state of an output GPIO line. | |
158 | */ | |
159 | void 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 | } | |
178 | EXPORT_SYMBOL(gpio_set_value); | |
179 | ||
180 | ||
181 | /* | |
182 | * Read the state of a GPIO line. | |
183 | */ | |
184 | int 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 | } | |
194 | EXPORT_SYMBOL(gpio_get_value); | |
195 | ||
196 | ||
197 | /* | |
198 | * Map GPIO line to IRQ number. | |
199 | */ | |
200 | int 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 | } | |
207 | EXPORT_SYMBOL(gpio_to_irq); | |
208 | ||
209 | ||
210 | /* | |
211 | * Map IRQ number to GPIO line. | |
212 | */ | |
213 | int 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 | } | |
220 | EXPORT_SYMBOL(irq_to_gpio); | |
20118ff9 AV |
221 | |
222 | ||
223 | /* .... Debug interface ..................................................... */ | |
224 | ||
225 | #ifdef CONFIG_DEBUG_FS | |
226 | ||
227 | static 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 | ||
281 | static int ks8695_gpio_open(struct inode *inode, struct file *file) | |
282 | { | |
283 | return single_open(file, ks8695_gpio_show, NULL); | |
284 | } | |
285 | ||
286 | static 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 | ||
293 | static 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 | } | |
299 | postcore_initcall(ks8695_gpio_debugfs_init); | |
300 | ||
301 | #endif |