#include <plat/irq.h>
#include "common.h"
-/*****************************************************************************
- * Orion GPIO IRQ
- *
- * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
- * value of the line or the opposite value.
- *
- * Level IRQ handlers: DATA_IN is used directly as cause register.
- * Interrupt are masked by LEVEL_MASK registers.
- * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE.
- * Interrupt are masked by EDGE_MASK registers.
- * Both-edge handlers: Similar to regular Edge handlers, but also swaps
- * the polarity to catch the next line transaction.
- * This is a race condition that might not perfectly
- * work on some use cases.
- *
- * Every eight GPIO lines are grouped (OR'ed) before going up to main
- * cause register.
- *
- * EDGE cause mask
- * data-in /--------| |-----| |----\
- * -----| |----- ---- to main cause reg
- * X \----------------| |----/
- * polarity LEVEL mask
- *
- ****************************************************************************/
-static void orion5x_gpio_irq_ack(u32 irq)
-{
- int pin = irq_to_gpio(irq);
- if (irq_desc[irq].status & IRQ_LEVEL)
- /*
- * Mask bit for level interrupt
- */
- orion5x_clrbits(GPIO_LEVEL_MASK, 1 << pin);
- else
- /*
- * Clear casue bit for egde interrupt
- */
- orion5x_clrbits(GPIO_EDGE_CAUSE, 1 << pin);
-}
-
-static void orion5x_gpio_irq_mask(u32 irq)
-{
- int pin = irq_to_gpio(irq);
- if (irq_desc[irq].status & IRQ_LEVEL)
- orion5x_clrbits(GPIO_LEVEL_MASK, 1 << pin);
- else
- orion5x_clrbits(GPIO_EDGE_MASK, 1 << pin);
-}
-
-static void orion5x_gpio_irq_unmask(u32 irq)
+static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
{
- int pin = irq_to_gpio(irq);
- if (irq_desc[irq].status & IRQ_LEVEL)
- orion5x_setbits(GPIO_LEVEL_MASK, 1 << pin);
- else
- orion5x_setbits(GPIO_EDGE_MASK, 1 << pin);
-}
-
-static int orion5x_gpio_set_irq_type(u32 irq, u32 type)
-{
- int pin = irq_to_gpio(irq);
- struct irq_desc *desc;
-
- if ((readl(GPIO_IO_CONF(pin)) & (1 << pin)) == 0) {
- printk(KERN_ERR "orion5x_gpio_set_irq_type failed "
- "(irq %d, pin %d).\n", irq, pin);
- return -EINVAL;
- }
-
- desc = irq_desc + irq;
-
- switch (type) {
- case IRQ_TYPE_LEVEL_HIGH:
- desc->handle_irq = handle_level_irq;
- desc->status |= IRQ_LEVEL;
- orion5x_clrbits(GPIO_IN_POL(pin), (1 << pin));
- break;
- case IRQ_TYPE_LEVEL_LOW:
- desc->handle_irq = handle_level_irq;
- desc->status |= IRQ_LEVEL;
- orion5x_setbits(GPIO_IN_POL(pin), (1 << pin));
- break;
- case IRQ_TYPE_EDGE_RISING:
- desc->handle_irq = handle_edge_irq;
- desc->status &= ~IRQ_LEVEL;
- orion5x_clrbits(GPIO_IN_POL(pin), (1 << pin));
- break;
- case IRQ_TYPE_EDGE_FALLING:
- desc->handle_irq = handle_edge_irq;
- desc->status &= ~IRQ_LEVEL;
- orion5x_setbits(GPIO_IN_POL(pin), (1 << pin));
- break;
- case IRQ_TYPE_EDGE_BOTH:
- desc->handle_irq = handle_edge_irq;
- desc->status &= ~IRQ_LEVEL;
- /*
- * set initial polarity based on current input level
- */
- if ((readl(GPIO_IN_POL(pin)) ^ readl(GPIO_DATA_IN(pin)))
- & (1 << pin))
- orion5x_setbits(GPIO_IN_POL(pin), (1 << pin)); /* falling */
- else
- orion5x_clrbits(GPIO_IN_POL(pin), (1 << pin)); /* rising */
-
- break;
- default:
- printk(KERN_ERR "failed to set irq=%d (type=%d)\n", irq, type);
- return -EINVAL;
- }
-
- desc->status &= ~IRQ_TYPE_SENSE_MASK;
- desc->status |= type & IRQ_TYPE_SENSE_MASK;
-
- return 0;
-}
-
-static struct irq_chip orion5x_gpio_irq_chip = {
- .name = "Orion-IRQ-GPIO",
- .ack = orion5x_gpio_irq_ack,
- .mask = orion5x_gpio_irq_mask,
- .unmask = orion5x_gpio_irq_unmask,
- .set_type = orion5x_gpio_set_irq_type,
-};
-
-static void orion5x_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
-{
- u32 cause, offs, pin;
-
BUG_ON(irq < IRQ_ORION5X_GPIO_0_7 || irq > IRQ_ORION5X_GPIO_24_31);
- offs = (irq - IRQ_ORION5X_GPIO_0_7) * 8;
- cause = (readl(GPIO_DATA_IN(offs)) & readl(GPIO_LEVEL_MASK)) |
- (readl(GPIO_EDGE_CAUSE) & readl(GPIO_EDGE_MASK));
- for (pin = offs; pin < offs + 8; pin++) {
- if (cause & (1 << pin)) {
- irq = gpio_to_irq(pin);
- desc = irq_desc + irq;
- if ((desc->status & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
- /* Swap polarity (race with GPIO line) */
- u32 polarity = readl(GPIO_IN_POL(pin));
- polarity ^= 1 << pin;
- writel(polarity, GPIO_IN_POL(pin));
- }
- generic_handle_irq(irq);
- }
- }
+ orion_gpio_irq_handler((irq - IRQ_ORION5X_GPIO_0_7) << 3);
}
-static void __init orion5x_init_gpio_irq(void)
+void __init orion5x_init_irq(void)
{
int i;
- struct irq_desc *desc;
+
+ orion_irq_init(0, (void __iomem *)MAIN_IRQ_MASK);
/*
* Mask and clear GPIO IRQ interrupts
*/
- writel(0x0, GPIO_LEVEL_MASK);
- writel(0x0, GPIO_EDGE_MASK);
- writel(0x0, GPIO_EDGE_CAUSE);
+ writel(0x0, GPIO_LEVEL_MASK(0));
+ writel(0x0, GPIO_EDGE_MASK(0));
+ writel(0x0, GPIO_EDGE_CAUSE(0));
/*
* Register chained level handlers for GPIO IRQs by default.
* User can use set_type() if he wants to use edge types handlers.
*/
for (i = IRQ_ORION5X_GPIO_START; i < NR_IRQS; i++) {
- set_irq_chip(i, &orion5x_gpio_irq_chip);
+ set_irq_chip(i, &orion_gpio_irq_level_chip);
set_irq_handler(i, handle_level_irq);
- desc = irq_desc + i;
- desc->status |= IRQ_LEVEL;
+ irq_desc[i].status |= IRQ_LEVEL;
set_irq_flags(i, IRQF_VALID);
}
- set_irq_chained_handler(IRQ_ORION5X_GPIO_0_7, orion5x_gpio_irq_handler);
- set_irq_chained_handler(IRQ_ORION5X_GPIO_8_15, orion5x_gpio_irq_handler);
- set_irq_chained_handler(IRQ_ORION5X_GPIO_16_23, orion5x_gpio_irq_handler);
- set_irq_chained_handler(IRQ_ORION5X_GPIO_24_31, orion5x_gpio_irq_handler);
-}
-
-/*****************************************************************************
- * Orion Main IRQ
- ****************************************************************************/
-static void __init orion5x_init_main_irq(void)
-{
- orion_irq_init(0, (void __iomem *)MAIN_IRQ_MASK);
-}
-
-void __init orion5x_init_irq(void)
-{
- orion5x_init_main_irq();
- orion5x_init_gpio_irq();
+ set_irq_chained_handler(IRQ_ORION5X_GPIO_0_7, gpio_irq_handler);
+ set_irq_chained_handler(IRQ_ORION5X_GPIO_8_15, gpio_irq_handler);
+ set_irq_chained_handler(IRQ_ORION5X_GPIO_16_23, gpio_irq_handler);
+ set_irq_chained_handler(IRQ_ORION5X_GPIO_24_31, gpio_irq_handler);
}
#include <linux/kernel.h>
#include <linux/init.h>
+#include <linux/irq.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/bitops.h>
spin_unlock_irqrestore(&gpio_lock, flags);
}
EXPORT_SYMBOL(orion_gpio_set_blink);
+
+
+/*****************************************************************************
+ * Orion GPIO IRQ
+ *
+ * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
+ * value of the line or the opposite value.
+ *
+ * Level IRQ handlers: DATA_IN is used directly as cause register.
+ * Interrupt are masked by LEVEL_MASK registers.
+ * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE.
+ * Interrupt are masked by EDGE_MASK registers.
+ * Both-edge handlers: Similar to regular Edge handlers, but also swaps
+ * the polarity to catch the next line transaction.
+ * This is a race condition that might not perfectly
+ * work on some use cases.
+ *
+ * Every eight GPIO lines are grouped (OR'ed) before going up to main
+ * cause register.
+ *
+ * EDGE cause mask
+ * data-in /--------| |-----| |----\
+ * -----| |----- ---- to main cause reg
+ * X \----------------| |----/
+ * polarity LEVEL mask
+ *
+ ****************************************************************************/
+static void gpio_irq_edge_ack(u32 irq)
+{
+ int pin = irq_to_gpio(irq);
+
+ writel(~(1 << (pin & 31)), GPIO_EDGE_CAUSE(pin));
+}
+
+static void gpio_irq_edge_mask(u32 irq)
+{
+ int pin = irq_to_gpio(irq);
+ u32 u;
+
+ u = readl(GPIO_EDGE_MASK(pin));
+ u &= ~(1 << (pin & 31));
+ writel(u, GPIO_EDGE_MASK(pin));
+}
+
+static void gpio_irq_edge_unmask(u32 irq)
+{
+ int pin = irq_to_gpio(irq);
+ u32 u;
+
+ u = readl(GPIO_EDGE_MASK(pin));
+ u |= 1 << (pin & 31);
+ writel(u, GPIO_EDGE_MASK(pin));
+}
+
+static void gpio_irq_level_mask(u32 irq)
+{
+ int pin = irq_to_gpio(irq);
+ u32 u;
+
+ u = readl(GPIO_LEVEL_MASK(pin));
+ u &= ~(1 << (pin & 31));
+ writel(u, GPIO_LEVEL_MASK(pin));
+}
+
+static void gpio_irq_level_unmask(u32 irq)
+{
+ int pin = irq_to_gpio(irq);
+ u32 u;
+
+ u = readl(GPIO_LEVEL_MASK(pin));
+ u |= 1 << (pin & 31);
+ writel(u, GPIO_LEVEL_MASK(pin));
+}
+
+static int gpio_irq_set_type(u32 irq, u32 type)
+{
+ int pin = irq_to_gpio(irq);
+ struct irq_desc *desc;
+ u32 u;
+
+ u = readl(GPIO_IO_CONF(pin)) & (1 << (pin & 31));
+ if (!u) {
+ printk(KERN_ERR "orion gpio_irq_set_type failed "
+ "(irq %d, pin %d).\n", irq, pin);
+ return -EINVAL;
+ }
+
+ desc = irq_desc + irq;
+
+ /*
+ * Set edge/level type.
+ */
+ if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
+ desc->chip = &orion_gpio_irq_edge_chip;
+ } else if (type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
+ desc->chip = &orion_gpio_irq_level_chip;
+ } else {
+ printk(KERN_ERR "failed to set irq=%d (type=%d)\n", irq, type);
+ return -EINVAL;
+ }
+
+ /*
+ * Configure interrupt polarity.
+ */
+ if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH) {
+ u = readl(GPIO_IN_POL(pin));
+ u &= ~(1 << (pin & 31));
+ writel(u, GPIO_IN_POL(pin));
+ } else if (type == IRQ_TYPE_EDGE_FALLING || type == IRQ_TYPE_LEVEL_LOW) {
+ u = readl(GPIO_IN_POL(pin));
+ u |= 1 << (pin & 31);
+ writel(u, GPIO_IN_POL(pin));
+ } else if (type == IRQ_TYPE_EDGE_BOTH) {
+ u32 v;
+
+ v = readl(GPIO_IN_POL(pin)) ^ readl(GPIO_DATA_IN(pin));
+
+ /*
+ * set initial polarity based on current input level
+ */
+ u = readl(GPIO_IN_POL(pin));
+ if (v & (1 << (pin & 31)))
+ u |= 1 << (pin & 31); /* falling */
+ else
+ u &= ~(1 << (pin & 31)); /* rising */
+ writel(u, GPIO_IN_POL(pin));
+ }
+
+ desc->status = (desc->status & ~IRQ_TYPE_SENSE_MASK) | type;
+
+ return 0;
+}
+
+struct irq_chip orion_gpio_irq_edge_chip = {
+ .name = "orion_gpio_irq_edge",
+ .ack = gpio_irq_edge_ack,
+ .mask = gpio_irq_edge_mask,
+ .unmask = gpio_irq_edge_unmask,
+ .set_type = gpio_irq_set_type,
+};
+
+struct irq_chip orion_gpio_irq_level_chip = {
+ .name = "orion_gpio_irq_level",
+ .mask = gpio_irq_level_mask,
+ .mask_ack = gpio_irq_level_mask,
+ .unmask = gpio_irq_level_unmask,
+ .set_type = gpio_irq_set_type,
+};
+
+void orion_gpio_irq_handler(int pinoff)
+{
+ u32 cause;
+ int pin;
+
+ cause = readl(GPIO_DATA_IN(pinoff)) & readl(GPIO_LEVEL_MASK(pinoff));
+ cause |= readl(GPIO_EDGE_CAUSE(pinoff)) & readl(GPIO_EDGE_MASK(pinoff));
+
+ for (pin = pinoff; pin < pinoff + 8; pin++) {
+ int irq = gpio_to_irq(pin);
+ struct irq_desc *desc = irq_desc + irq;
+
+ if (!(cause & (1 << (pin & 31))))
+ continue;
+
+ if ((desc->status & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
+ /* Swap polarity (race with GPIO line) */
+ u32 polarity;
+
+ polarity = readl(GPIO_IN_POL(pin));
+ polarity ^= 1 << (pin & 31);
+ writel(polarity, GPIO_IN_POL(pin));
+ }
+ desc_handle_irq(irq, desc);
+ }
+}
projects / openwrt / staging / blogic.git / commitdiff