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authorAndrew Victor <andrew@sanpeople.com>2007-05-14 09:30:15 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2007-07-12 06:12:34 -0400
commit8a87a996eae3d25b0670a243f4829ea4aa9eb63d (patch)
treed9be23b6bc2b061c57e066848059fda3e09f8d01 /arch/arm/mach-ks8695/gpio.c
parent7dcca30a32aadb0520417521b0c44f42d09fe05c (diff)
[ARM] 4377/1: KS8695: GPIO driver
Driver to control the GPIO pins on the KS8695 processor. The driver natively supports the Generic GPIO interface. Signed-off-by: Andrew Victor <andrew@sanpeople.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-ks8695/gpio.c')
-rw-r--r--arch/arm/mach-ks8695/gpio.c218
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 */
36static 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
57static 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 */
62int __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}
86EXPORT_SYMBOL(ks8695_gpio_interrupt);
87
88
89
90/* .... Generic GPIO interface .............................................. */
91
92/*
93 * Configure the GPIO line as an input.
94 */
95int __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}
116EXPORT_SYMBOL(gpio_direction_input);
117
118
119/*
120 * Configure the GPIO line as an output, with default state.
121 */
122int __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}
151EXPORT_SYMBOL(gpio_direction_output);
152
153
154/*
155 * Set the state of an output GPIO line.
156 */
157void 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}
176EXPORT_SYMBOL(gpio_set_value);
177
178
179/*
180 * Read the state of a GPIO line.
181 */
182int 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}
192EXPORT_SYMBOL(gpio_get_value);
193
194
195/*
196 * Map GPIO line to IRQ number.
197 */
198int 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}
205EXPORT_SYMBOL(gpio_to_irq);
206
207
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);