diff options
Diffstat (limited to 'arch/arm/mach-ks8695/gpio.c')
-rw-r--r-- | arch/arm/mach-ks8695/gpio.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/arch/arm/mach-ks8695/gpio.c b/arch/arm/mach-ks8695/gpio.c new file mode 100644 index 000000000000..b1aa3cb3d4a3 --- /dev/null +++ b/arch/arm/mach-ks8695/gpio.c | |||
@@ -0,0 +1,218 @@ | |||
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> | ||
23 | #include <linux/module.h> | ||
24 | |||
25 | #include <asm/io.h> | ||
26 | #include <asm/hardware.h> | ||
27 | #include <asm/mach/irq.h> | ||
28 | |||
29 | #include <asm/arch/regs-gpio.h> | ||
30 | #include <asm/arch/gpio.h> | ||
31 | |||
32 | /* | ||
33 | * Configure a GPIO line for either GPIO function, or its internal | ||
34 | * function (Interrupt, Timer, etc). | ||
35 | */ | ||
36 | static void __init_or_module ks8695_gpio_mode(unsigned int pin, short gpio) | ||
37 | { | ||
38 | unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN }; | ||
39 | unsigned long x, flags; | ||
40 | |||
41 | if (pin > KS8695_GPIO_5) /* only GPIO 0..5 have internal functions */ | ||
42 | return; | ||
43 | |||
44 | local_irq_save(flags); | ||
45 | |||
46 | x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC); | ||
47 | if (gpio) /* GPIO: set bit to 0 */ | ||
48 | x &= ~enable[pin]; | ||
49 | else /* Internal function: set bit to 1 */ | ||
50 | x |= enable[pin]; | ||
51 | __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPC); | ||
52 | |||
53 | local_irq_restore(flags); | ||
54 | } | ||
55 | |||
56 | |||
57 | static unsigned short gpio_irq[] = { KS8695_IRQ_EXTERN0, KS8695_IRQ_EXTERN1, KS8695_IRQ_EXTERN2, KS8695_IRQ_EXTERN3 }; | ||
58 | |||
59 | /* | ||
60 | * Configure GPIO pin as external interrupt source. | ||
61 | */ | ||
62 | int __init_or_module ks8695_gpio_interrupt(unsigned int pin, unsigned int type) | ||
63 | { | ||
64 | unsigned long x, flags; | ||
65 | |||
66 | if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */ | ||
67 | return -EINVAL; | ||
68 | |||
69 | local_irq_save(flags); | ||
70 | |||
71 | /* set pin as input */ | ||
72 | x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM); | ||
73 | x &= ~IOPM_(pin); | ||
74 | __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM); | ||
75 | |||
76 | local_irq_restore(flags); | ||
77 | |||
78 | /* Set IRQ triggering type */ | ||
79 | set_irq_type(gpio_irq[pin], type); | ||
80 | |||
81 | /* enable interrupt mode */ | ||
82 | ks8695_gpio_mode(pin, 0); | ||
83 | |||
84 | return 0; | ||
85 | } | ||
86 | EXPORT_SYMBOL(ks8695_gpio_interrupt); | ||
87 | |||
88 | |||
89 | |||
90 | /* .... Generic GPIO interface .............................................. */ | ||
91 | |||
92 | /* | ||
93 | * Configure the GPIO line as an input. | ||
94 | */ | ||
95 | int __init_or_module gpio_direction_input(unsigned int pin) | ||
96 | { | ||
97 | unsigned long x, flags; | ||
98 | |||
99 | if (pin > KS8695_GPIO_15) | ||
100 | return -EINVAL; | ||
101 | |||
102 | /* set pin to GPIO mode */ | ||
103 | ks8695_gpio_mode(pin, 1); | ||
104 | |||
105 | local_irq_save(flags); | ||
106 | |||
107 | /* set pin as input */ | ||
108 | x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM); | ||
109 | x &= ~IOPM_(pin); | ||
110 | __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM); | ||
111 | |||
112 | local_irq_restore(flags); | ||
113 | |||
114 | return 0; | ||
115 | } | ||
116 | EXPORT_SYMBOL(gpio_direction_input); | ||
117 | |||
118 | |||
119 | /* | ||
120 | * Configure the GPIO line as an output, with default state. | ||
121 | */ | ||
122 | int __init_or_module gpio_direction_output(unsigned int pin, unsigned int state) | ||
123 | { | ||
124 | unsigned long x, flags; | ||
125 | |||
126 | if (pin > KS8695_GPIO_15) | ||
127 | return -EINVAL; | ||
128 | |||
129 | /* set pin to GPIO mode */ | ||
130 | ks8695_gpio_mode(pin, 1); | ||
131 | |||
132 | local_irq_save(flags); | ||
133 | |||
134 | /* set line state */ | ||
135 | x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD); | ||
136 | if (state) | ||
137 | x |= (1 << pin); | ||
138 | else | ||
139 | x &= ~(1 << pin); | ||
140 | __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD); | ||
141 | |||
142 | /* set pin as output */ | ||
143 | x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM); | ||
144 | x |= IOPM_(pin); | ||
145 | __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM); | ||
146 | |||
147 | local_irq_restore(flags); | ||
148 | |||
149 | return 0; | ||
150 | } | ||
151 | EXPORT_SYMBOL(gpio_direction_output); | ||
152 | |||
153 | |||
154 | /* | ||
155 | * Set the state of an output GPIO line. | ||
156 | */ | ||
157 | void gpio_set_value(unsigned int pin, unsigned int state) | ||
158 | { | ||
159 | unsigned long x, flags; | ||
160 | |||
161 | if (pin > KS8695_GPIO_15) | ||
162 | return; | ||
163 | |||
164 | local_irq_save(flags); | ||
165 | |||
166 | /* set output line state */ | ||
167 | x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD); | ||
168 | if (state) | ||
169 | x |= (1 << pin); | ||
170 | else | ||
171 | x &= ~(1 << pin); | ||
172 | __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD); | ||
173 | |||
174 | local_irq_restore(flags); | ||
175 | } | ||
176 | EXPORT_SYMBOL(gpio_set_value); | ||
177 | |||
178 | |||
179 | /* | ||
180 | * Read the state of a GPIO line. | ||
181 | */ | ||
182 | int gpio_get_value(unsigned int pin) | ||
183 | { | ||
184 | unsigned long x; | ||
185 | |||
186 | if (pin > KS8695_GPIO_15) | ||
187 | return -EINVAL; | ||
188 | |||
189 | x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD); | ||
190 | return (x & (1 << pin)) != 0; | ||
191 | } | ||
192 | EXPORT_SYMBOL(gpio_get_value); | ||
193 | |||
194 | |||
195 | /* | ||
196 | * Map GPIO line to IRQ number. | ||
197 | */ | ||
198 | int gpio_to_irq(unsigned int pin) | ||
199 | { | ||
200 | if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */ | ||
201 | return -EINVAL; | ||
202 | |||
203 | return gpio_irq[pin]; | ||
204 | } | ||
205 | EXPORT_SYMBOL(gpio_to_irq); | ||
206 | |||
207 | |||
208 | /* | ||
209 | * Map IRQ number to GPIO line. | ||
210 | */ | ||
211 | int 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 | } | ||
218 | EXPORT_SYMBOL(irq_to_gpio); | ||