2 * arch/arm/mach-orion5x/gpio.c
4 * GPIO functions for Marvell Orion System On Chip
6 * Maintainer: Tzachi Perelstein <tzachi@marvell.com>
8 * This file is licensed under the terms of the GNU General Public
9 * License version 2. This program is licensed "as is" without any
10 * warranty of any kind, whether express or implied.
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/module.h>
16 #include <linux/spinlock.h>
17 #include <linux/bitops.h>
20 #include <asm/arch/orion5x.h>
23 static DEFINE_SPINLOCK(gpio_lock);
24 static unsigned long gpio_valid[BITS_TO_LONGS(GPIO_MAX)];
25 static const char *gpio_label[GPIO_MAX]; /* non null for allocated GPIOs */
27 void __init orion5x_gpio_set_valid_pins(u32 pins)
33 * GENERIC_GPIO primitives
35 int gpio_direction_input(unsigned pin)
39 if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
40 pr_debug("%s: invalid GPIO %d\n", __func__, pin);
44 spin_lock_irqsave(&gpio_lock, flags);
47 * Some callers might have not used the gpio_request(),
48 * so flag this pin as requested now.
51 gpio_label[pin] = "?";
53 orion5x_setbits(GPIO_IO_CONF, 1 << pin);
55 spin_unlock_irqrestore(&gpio_lock, flags);
58 EXPORT_SYMBOL(gpio_direction_input);
60 int gpio_direction_output(unsigned pin, int value)
65 if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
66 pr_debug("%s: invalid GPIO %d\n", __func__, pin);
70 spin_lock_irqsave(&gpio_lock, flags);
73 * Some callers might have not used the gpio_request(),
74 * so flag this pin as requested now.
77 gpio_label[pin] = "?";
80 orion5x_clrbits(GPIO_BLINK_EN, mask);
82 orion5x_setbits(GPIO_OUT, mask);
84 orion5x_clrbits(GPIO_OUT, mask);
85 orion5x_clrbits(GPIO_IO_CONF, mask);
87 spin_unlock_irqrestore(&gpio_lock, flags);
90 EXPORT_SYMBOL(gpio_direction_output);
92 int gpio_get_value(unsigned pin)
94 int val, mask = 1 << pin;
96 if (orion5x_read(GPIO_IO_CONF) & mask)
97 val = orion5x_read(GPIO_DATA_IN) ^ orion5x_read(GPIO_IN_POL);
99 val = orion5x_read(GPIO_OUT);
103 EXPORT_SYMBOL(gpio_get_value);
105 void gpio_set_value(unsigned pin, int value)
110 spin_lock_irqsave(&gpio_lock, flags);
112 orion5x_clrbits(GPIO_BLINK_EN, mask);
114 orion5x_setbits(GPIO_OUT, mask);
116 orion5x_clrbits(GPIO_OUT, mask);
118 spin_unlock_irqrestore(&gpio_lock, flags);
120 EXPORT_SYMBOL(gpio_set_value);
122 void orion5x_gpio_set_blink(unsigned pin, int blink)
127 spin_lock_irqsave(&gpio_lock, flags);
129 orion5x_clrbits(GPIO_OUT, mask);
131 orion5x_setbits(GPIO_BLINK_EN, mask);
133 orion5x_clrbits(GPIO_BLINK_EN, mask);
135 spin_unlock_irqrestore(&gpio_lock, flags);
137 EXPORT_SYMBOL(orion5x_gpio_set_blink);
139 int gpio_request(unsigned pin, const char *label)
144 if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
145 pr_debug("%s: invalid GPIO %d\n", __func__, pin);
149 spin_lock_irqsave(&gpio_lock, flags);
151 if (gpio_label[pin]) {
152 pr_debug("%s: GPIO %d already used as %s\n",
153 __func__, pin, gpio_label[pin]);
156 gpio_label[pin] = label ? label : "?";
158 spin_unlock_irqrestore(&gpio_lock, flags);
161 EXPORT_SYMBOL(gpio_request);
163 void gpio_free(unsigned pin)
165 if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
166 pr_debug("%s: invalid GPIO %d\n", __func__, pin);
170 if (!gpio_label[pin])
171 pr_warning("%s: GPIO %d already freed\n", __func__, pin);
173 gpio_label[pin] = NULL;
175 EXPORT_SYMBOL(gpio_free);
178 void gpio_display(void)
182 for (i = 0; i < GPIO_MAX; i++) {
183 printk(KERN_DEBUG "Pin-%d: ", i);
185 if (!test_bit(i, gpio_valid)) {
186 printk("non-GPIO\n");
187 } else if (!gpio_label[i]) {
188 printk("GPIO, free\n");
190 printk("GPIO, used by %s, ", gpio_label[i]);
191 if (orion5x_read(GPIO_IO_CONF) & (1 << i)) {
192 printk("input, active %s, level %s, edge %s\n",
193 ((orion5x_read(GPIO_IN_POL) >> i) & 1) ? "low" : "high",
194 ((orion5x_read(GPIO_LEVEL_MASK) >> i) & 1) ? "enabled" : "masked",
195 ((orion5x_read(GPIO_EDGE_MASK) >> i) & 1) ? "enabled" : "masked");
197 printk("output, val=%d\n", (orion5x_read(GPIO_OUT) >> i) & 1);
202 printk(KERN_DEBUG "MPP_0_7_CTRL (0x%08x) = 0x%08x\n",
203 MPP_0_7_CTRL, orion5x_read(MPP_0_7_CTRL));
204 printk(KERN_DEBUG "MPP_8_15_CTRL (0x%08x) = 0x%08x\n",
205 MPP_8_15_CTRL, orion5x_read(MPP_8_15_CTRL));
206 printk(KERN_DEBUG "MPP_16_19_CTRL (0x%08x) = 0x%08x\n",
207 MPP_16_19_CTRL, orion5x_read(MPP_16_19_CTRL));
208 printk(KERN_DEBUG "MPP_DEV_CTRL (0x%08x) = 0x%08x\n",
209 MPP_DEV_CTRL, orion5x_read(MPP_DEV_CTRL));
210 printk(KERN_DEBUG "GPIO_OUT (0x%08x) = 0x%08x\n",
211 GPIO_OUT, orion5x_read(GPIO_OUT));
212 printk(KERN_DEBUG "GPIO_IO_CONF (0x%08x) = 0x%08x\n",
213 GPIO_IO_CONF, orion5x_read(GPIO_IO_CONF));
214 printk(KERN_DEBUG "GPIO_BLINK_EN (0x%08x) = 0x%08x\n",
215 GPIO_BLINK_EN, orion5x_read(GPIO_BLINK_EN));
216 printk(KERN_DEBUG "GPIO_IN_POL (0x%08x) = 0x%08x\n",
217 GPIO_IN_POL, orion5x_read(GPIO_IN_POL));
218 printk(KERN_DEBUG "GPIO_DATA_IN (0x%08x) = 0x%08x\n",
219 GPIO_DATA_IN, orion5x_read(GPIO_DATA_IN));
220 printk(KERN_DEBUG "GPIO_LEVEL_MASK (0x%08x) = 0x%08x\n",
221 GPIO_LEVEL_MASK, orion5x_read(GPIO_LEVEL_MASK));
222 printk(KERN_DEBUG "GPIO_EDGE_CAUSE (0x%08x) = 0x%08x\n",
223 GPIO_EDGE_CAUSE, orion5x_read(GPIO_EDGE_CAUSE));
224 printk(KERN_DEBUG "GPIO_EDGE_MASK (0x%08x) = 0x%08x\n",
225 GPIO_EDGE_MASK, orion5x_read(GPIO_EDGE_MASK));