aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-imx/generic.c
diff options
context:
space:
mode:
authorPavel Pisa <ppisa@pikron.com>2007-05-12 09:31:17 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2007-07-12 06:11:39 -0400
commitb3e6a508ed920698d367e5993ed056d70364d91f (patch)
tree4097af7112f18f4e610d16d46c95746f6d1621a6 /arch/arm/mach-imx/generic.c
parent7dcca30a32aadb0520417521b0c44f42d09fe05c (diff)
[ARM] 4373/1: i.MX/MX1 GPIO support implementation
Support for generic input output for MX1 family. The implementation prevents allocation of one pin by two users, but does not store pointer to the user description permanently, because this solution would have bigger memory overhead. The simple way to integrate code with per BSP pins setup and allocation is required else all GPIO registration checking is useless. The function imx_gpio_setup_multiple_pins() can be used for this purpose in future. Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-imx/generic.c')
-rw-r--r--arch/arm/mach-imx/generic.c118
1 files changed, 118 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/generic.c b/arch/arm/mach-imx/generic.c
index 1c474cf709ca..a58b678006df 100644
--- a/arch/arm/mach-imx/generic.c
+++ b/arch/arm/mach-imx/generic.c
@@ -28,12 +28,16 @@
28#include <linux/module.h> 28#include <linux/module.h>
29#include <linux/string.h> 29#include <linux/string.h>
30 30
31#include <asm/errno.h>
31#include <asm/arch/imxfb.h> 32#include <asm/arch/imxfb.h>
32#include <asm/hardware.h> 33#include <asm/hardware.h>
33#include <asm/arch/imx-regs.h> 34#include <asm/arch/imx-regs.h>
34 35
35#include <asm/mach/map.h> 36#include <asm/mach/map.h>
36#include <asm/arch/mmc.h> 37#include <asm/arch/mmc.h>
38#include <asm/arch/gpio.h>
39
40unsigned long imx_gpio_alloc_map[(GPIO_PORT_MAX + 1) * 32 / BITS_PER_LONG];
37 41
38void imx_gpio_mode(int gpio_mode) 42void imx_gpio_mode(int gpio_mode)
39{ 43{
@@ -95,6 +99,120 @@ void imx_gpio_mode(int gpio_mode)
95 99
96EXPORT_SYMBOL(imx_gpio_mode); 100EXPORT_SYMBOL(imx_gpio_mode);
97 101
102int imx_gpio_request(unsigned gpio, const char *label)
103{
104 if(gpio >= (GPIO_PORT_MAX + 1) * 32)
105 printk(KERN_ERR "imx_gpio: Attempt to request nonexistent GPIO %d for \"%s\"\n",
106 gpio, label ? label : "?");
107 return -EINVAL;
108
109 if(test_and_set_bit(gpio, imx_gpio_alloc_map)) {
110 printk(KERN_ERR "imx_gpio: GPIO %d already used. Allocation for \"%s\" failed\n",
111 gpio, label ? label : "?");
112 return -EBUSY;
113 }
114
115 return 0;
116}
117
118EXPORT_SYMBOL(imx_gpio_request);
119
120void imx_gpio_free(unsigned gpio)
121{
122 if(gpio >= (GPIO_PORT_MAX + 1) * 32)
123 return;
124
125 clear_bit(gpio, imx_gpio_alloc_map);
126}
127
128EXPORT_SYMBOL(imx_gpio_free);
129
130int imx_gpio_direction_input(unsigned gpio)
131{
132 imx_gpio_mode(gpio| GPIO_IN);
133 return 0;
134}
135
136EXPORT_SYMBOL(imx_gpio_direction_input);
137
138int imx_gpio_direction_output(unsigned gpio, int value)
139{
140 imx_gpio_set_value(gpio, value);
141 imx_gpio_mode(gpio| GPIO_OUT);
142 return 0;
143}
144
145EXPORT_SYMBOL(imx_gpio_direction_output);
146
147int imx_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
148 int alloc_mode, const char *label)
149{
150 const int *p = pin_list;
151 int i;
152 unsigned gpio;
153 unsigned mode;
154
155 for (i = 0; i < count; i++) {
156 gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
157 mode = *p & ~(GPIO_PIN_MASK | GPIO_PORT_MASK);
158
159 if (gpio >= (GPIO_PORT_MAX + 1) * 32)
160 goto setup_error;
161
162 if (alloc_mode & IMX_GPIO_ALLOC_MODE_RELEASE)
163 imx_gpio_free(gpio);
164 else if (!(alloc_mode & IMX_GPIO_ALLOC_MODE_NO_ALLOC))
165 if (imx_gpio_request(gpio, label))
166 if (!(alloc_mode & IMX_GPIO_ALLOC_MODE_TRY_ALLOC))
167 goto setup_error;
168
169 if (!(alloc_mode & (IMX_GPIO_ALLOC_MODE_ALLOC_ONLY |
170 IMX_GPIO_ALLOC_MODE_RELEASE)))
171 imx_gpio_mode(gpio | mode);
172
173 p++;
174 }
175 return 0;
176
177setup_error:
178 if(alloc_mode & (IMX_GPIO_ALLOC_MODE_NO_ALLOC |
179 IMX_GPIO_ALLOC_MODE_TRY_ALLOC))
180 return -EINVAL;
181
182 while (p != pin_list) {
183 p--;
184 gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
185 imx_gpio_free(gpio);
186 }
187
188 return -EINVAL;
189}
190
191EXPORT_SYMBOL(imx_gpio_setup_multiple_pins);
192
193void __imx_gpio_set_value(unsigned gpio, int value)
194{
195 imx_gpio_set_value_inline(gpio, value);
196}
197
198EXPORT_SYMBOL(__imx_gpio_set_value);
199
200int imx_gpio_to_irq(unsigned gpio)
201{
202 return IRQ_GPIOA(0) + gpio;
203}
204
205EXPORT_SYMBOL(imx_gpio_to_irq);
206
207int imx_irq_to_gpio(unsigned irq)
208{
209 if (irq < IRQ_GPIOA(0))
210 return -EINVAL;
211 return irq - IRQ_GPIOA(0);
212}
213
214EXPORT_SYMBOL(imx_irq_to_gpio);
215
98/* 216/*
99 * get the system pll clock in Hz 217 * get the system pll clock in Hz
100 * 218 *