Hi,
please find below a link to use GPIO IRQ on ATH79 platform. It works but uses
an ugly way to clear the IRQ:
+static void ath79_gpio_irq(unsigned int irq, struct irq_desc *desc)
+{
+ void __iomem *base = ath79_gpio_base;
+ void __iomem *base2 = ath79_reset_base;
+ unsigned int stat = __raw_readl(base + AR71XX_GPIO_REG_INT_PENDING);
+ int irq_base = ATH79_GPIO_IRQ_BASE;
+
+ while (stat) {
+ int bit_num = __ffs(stat);
+ unsigned long bit = (1<<bit_num);
+
+ if (bit & gpio_both_edge) {
+ __raw_writel(__raw_readl(base +
AR71XX_GPIO_REG_INT_POLARITY) ^ bit,
+ base + AR71XX_GPIO_REG_INT_POLARITY);
+ }
+
+ generic_handle_irq(irq_base + bit_num);
+ stat &= ~bit;
+ }
+
+ /* TODO: reset GPIO MISC INT - this is not the usual place to do this */
+ __raw_writel(1<<3, base2 + AR71XX_RESET_REG_MISC_INT_STATUS);
+ /* and flush write */
+ __raw_readl(base2 + AR71XX_RESET_REG_MISC_INT_STATUS);
+}
Could someone of you wizards have a look at the patch and (maybe) add a patch
for OpenWRT trunk ?
Link to GPIO IRQ patch for ATH79:
https://raw.githubusercontent.com/GBert/openwrt-misc/master/gpio-test/src/patches-3.18/728-MIPS-ath79-add-gpio-irq.patch
Best regards
Gerd
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