summaryrefslogtreecommitdiff
path: root/arch/arm/mach-orion/gpio.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-orion/gpio.c')
-rw-r--r--arch/arm/mach-orion/gpio.c225
1 files changed, 225 insertions, 0 deletions
diff --git a/arch/arm/mach-orion/gpio.c b/arch/arm/mach-orion/gpio.c
new file mode 100644
index 000000000000..d5f00c86d616
--- /dev/null
+++ b/arch/arm/mach-orion/gpio.c
@@ -0,0 +1,225 @@
+/*
+ * arch/arm/mach-orion/gpio.c
+ *
+ * GPIO functions for Marvell Orion System On Chip
+ *
+ * Maintainer: Tzachi Perelstein <tzachi@marvell.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/bitops.h>
+#include <asm/gpio.h>
+#include <asm/arch/orion.h>
+#include "common.h"
+
+static DEFINE_SPINLOCK(gpio_lock);
+static unsigned long gpio_valid[BITS_TO_LONGS(GPIO_MAX)];
+static const char *gpio_label[GPIO_MAX]; /* non null for allocated GPIOs */
+
+void __init orion_gpio_set_valid_pins(u32 pins)
+{
+ gpio_valid[0] = pins;
+}
+
+/*
+ * GENERIC_GPIO primitives
+ */
+int gpio_direction_input(unsigned pin)
+{
+ unsigned long flags;
+
+ if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
+ pr_debug("%s: invalid GPIO %d\n", __FUNCTION__, pin);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ /*
+ * Some callers might have not used the gpio_request(),
+ * so flag this pin as requested now.
+ */
+ if (!gpio_label[pin])
+ gpio_label[pin] = "?";
+
+ orion_setbits(GPIO_IO_CONF, 1 << pin);
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+ return 0;
+}
+EXPORT_SYMBOL(gpio_direction_input);
+
+int gpio_direction_output(unsigned pin, int value)
+{
+ unsigned long flags;
+ int mask;
+
+ if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
+ pr_debug("%s: invalid GPIO %d\n", __FUNCTION__, pin);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ /*
+ * Some callers might have not used the gpio_request(),
+ * so flag this pin as requested now.
+ */
+ if (!gpio_label[pin])
+ gpio_label[pin] = "?";
+
+ mask = 1 << pin;
+ orion_clrbits(GPIO_BLINK_EN, mask);
+ if (value)
+ orion_setbits(GPIO_OUT, mask);
+ else
+ orion_clrbits(GPIO_OUT, mask);
+ orion_clrbits(GPIO_IO_CONF, mask);
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+ return 0;
+}
+EXPORT_SYMBOL(gpio_direction_output);
+
+int gpio_get_value(unsigned pin)
+{
+ int val, mask = 1 << pin;
+
+ if (orion_read(GPIO_IO_CONF) & mask)
+ val = orion_read(GPIO_DATA_IN) ^ orion_read(GPIO_IN_POL);
+ else
+ val = orion_read(GPIO_OUT);
+
+ return val & mask;
+}
+EXPORT_SYMBOL(gpio_get_value);
+
+void gpio_set_value(unsigned pin, int value)
+{
+ unsigned long flags;
+ int mask = 1 << pin;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ orion_clrbits(GPIO_BLINK_EN, mask);
+ if (value)
+ orion_setbits(GPIO_OUT, mask);
+ else
+ orion_clrbits(GPIO_OUT, mask);
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+}
+EXPORT_SYMBOL(gpio_set_value);
+
+void orion_gpio_set_blink(unsigned pin, int blink)
+{
+ unsigned long flags;
+ int mask = 1 << pin;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ orion_clrbits(GPIO_OUT, mask);
+ if (blink)
+ orion_setbits(GPIO_BLINK_EN, mask);
+ else
+ orion_clrbits(GPIO_BLINK_EN, mask);
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+}
+EXPORT_SYMBOL(orion_gpio_set_blink);
+
+int gpio_request(unsigned pin, const char *label)
+{
+ int ret = 0;
+ unsigned long flags;
+
+ if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
+ pr_debug("%s: invalid GPIO %d\n", __FUNCTION__, pin);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ if (gpio_label[pin]) {
+ pr_debug("%s: GPIO %d already used as %s\n",
+ __FUNCTION__, pin, gpio_label[pin]);
+ ret = -EBUSY;
+ } else
+ gpio_label[pin] = label ? label : "?";
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL(gpio_request);
+
+void gpio_free(unsigned pin)
+{
+ if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
+ pr_debug("%s: invalid GPIO %d\n", __FUNCTION__, pin);
+ return;
+ }
+
+ if (!gpio_label[pin])
+ pr_warning("%s: GPIO %d already freed\n", __FUNCTION__, pin);
+ else
+ gpio_label[pin] = NULL;
+}
+EXPORT_SYMBOL(gpio_free);
+
+/* Debug helper */
+void gpio_display(void)
+{
+ int i;
+
+ for (i = 0; i < GPIO_MAX; i++) {
+ printk(KERN_DEBUG "Pin-%d: ", i);
+
+ if (!test_bit(i, gpio_valid)) {
+ printk("non-GPIO\n");
+ } else if (!gpio_label[i]) {
+ printk("GPIO, free\n");
+ } else {
+ printk("GPIO, used by %s, ", gpio_label[i]);
+ if (orion_read(GPIO_IO_CONF) & (1 << i)) {
+ printk("input, active %s, level %s, edge %s\n",
+ ((orion_read(GPIO_IN_POL) >> i) & 1) ? "low" : "high",
+ ((orion_read(GPIO_LEVEL_MASK) >> i) & 1) ? "enabled" : "masked",
+ ((orion_read(GPIO_EDGE_MASK) >> i) & 1) ? "enabled" : "masked");
+ } else {
+ printk("output, val=%d\n", (orion_read(GPIO_OUT) >> i) & 1);
+ }
+ }
+ }
+
+ printk(KERN_DEBUG "MPP_0_7_CTRL (0x%08x) = 0x%08x\n",
+ MPP_0_7_CTRL, orion_read(MPP_0_7_CTRL));
+ printk(KERN_DEBUG "MPP_8_15_CTRL (0x%08x) = 0x%08x\n",
+ MPP_8_15_CTRL, orion_read(MPP_8_15_CTRL));
+ printk(KERN_DEBUG "MPP_16_19_CTRL (0x%08x) = 0x%08x\n",
+ MPP_16_19_CTRL, orion_read(MPP_16_19_CTRL));
+ printk(KERN_DEBUG "MPP_DEV_CTRL (0x%08x) = 0x%08x\n",
+ MPP_DEV_CTRL, orion_read(MPP_DEV_CTRL));
+ printk(KERN_DEBUG "GPIO_OUT (0x%08x) = 0x%08x\n",
+ GPIO_OUT, orion_read(GPIO_OUT));
+ printk(KERN_DEBUG "GPIO_IO_CONF (0x%08x) = 0x%08x\n",
+ GPIO_IO_CONF, orion_read(GPIO_IO_CONF));
+ printk(KERN_DEBUG "GPIO_BLINK_EN (0x%08x) = 0x%08x\n",
+ GPIO_BLINK_EN, orion_read(GPIO_BLINK_EN));
+ printk(KERN_DEBUG "GPIO_IN_POL (0x%08x) = 0x%08x\n",
+ GPIO_IN_POL, orion_read(GPIO_IN_POL));
+ printk(KERN_DEBUG "GPIO_DATA_IN (0x%08x) = 0x%08x\n",
+ GPIO_DATA_IN, orion_read(GPIO_DATA_IN));
+ printk(KERN_DEBUG "GPIO_LEVEL_MASK (0x%08x) = 0x%08x\n",
+ GPIO_LEVEL_MASK, orion_read(GPIO_LEVEL_MASK));
+ printk(KERN_DEBUG "GPIO_EDGE_CAUSE (0x%08x) = 0x%08x\n",
+ GPIO_EDGE_CAUSE, orion_read(GPIO_EDGE_CAUSE));
+ printk(KERN_DEBUG "GPIO_EDGE_MASK (0x%08x) = 0x%08x\n",
+ GPIO_EDGE_MASK, orion_read(GPIO_EDGE_MASK));
+}
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-23 20:01:44 +0300