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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/arm/mach-dove/irq.c
Initial import
Diffstat (limited to 'arch/arm/mach-dove/irq.c')
-rw-r--r--arch/arm/mach-dove/irq.c178
1 files changed, 178 insertions, 0 deletions
diff --git a/arch/arm/mach-dove/irq.c b/arch/arm/mach-dove/irq.c
new file mode 100644
index 000000000..df0223f76
--- /dev/null
+++ b/arch/arm/mach-dove/irq.c
@@ -0,0 +1,178 @@
+/*
+ * arch/arm/mach-dove/irq.c
+ *
+ * Dove IRQ handling.
+ *
+ * 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/irq.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <asm/mach/arch.h>
+#include <plat/irq.h>
+#include <asm/mach/irq.h>
+#include <mach/pm.h>
+#include <mach/bridge-regs.h>
+#include <plat/orion-gpio.h>
+#include "common.h"
+
+static void pmu_irq_mask(struct irq_data *d)
+{
+ int pin = irq_to_pmu(d->irq);
+ u32 u;
+
+ u = readl(PMU_INTERRUPT_MASK);
+ u &= ~(1 << (pin & 31));
+ writel(u, PMU_INTERRUPT_MASK);
+}
+
+static void pmu_irq_unmask(struct irq_data *d)
+{
+ int pin = irq_to_pmu(d->irq);
+ u32 u;
+
+ u = readl(PMU_INTERRUPT_MASK);
+ u |= 1 << (pin & 31);
+ writel(u, PMU_INTERRUPT_MASK);
+}
+
+static void pmu_irq_ack(struct irq_data *d)
+{
+ int pin = irq_to_pmu(d->irq);
+ u32 u;
+
+ /*
+ * The PMU mask register is not RW0C: it is RW. This means that
+ * the bits take whatever value is written to them; if you write
+ * a '1', you will set the interrupt.
+ *
+ * Unfortunately this means there is NO race free way to clear
+ * these interrupts.
+ *
+ * So, let's structure the code so that the window is as small as
+ * possible.
+ */
+ u = ~(1 << (pin & 31));
+ u &= readl_relaxed(PMU_INTERRUPT_CAUSE);
+ writel_relaxed(u, PMU_INTERRUPT_CAUSE);
+}
+
+static struct irq_chip pmu_irq_chip = {
+ .name = "pmu_irq",
+ .irq_mask = pmu_irq_mask,
+ .irq_unmask = pmu_irq_unmask,
+ .irq_ack = pmu_irq_ack,
+};
+
+static void pmu_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+ unsigned long cause = readl(PMU_INTERRUPT_CAUSE);
+
+ cause &= readl(PMU_INTERRUPT_MASK);
+ if (cause == 0) {
+ do_bad_IRQ(irq, desc);
+ return;
+ }
+
+ for (irq = 0; irq < NR_PMU_IRQS; irq++) {
+ if (!(cause & (1 << irq)))
+ continue;
+ irq = pmu_to_irq(irq);
+ generic_handle_irq(irq);
+ }
+}
+
+static int __initdata gpio0_irqs[4] = {
+ IRQ_DOVE_GPIO_0_7,
+ IRQ_DOVE_GPIO_8_15,
+ IRQ_DOVE_GPIO_16_23,
+ IRQ_DOVE_GPIO_24_31,
+};
+
+static int __initdata gpio1_irqs[4] = {
+ IRQ_DOVE_HIGH_GPIO,
+ 0,
+ 0,
+ 0,
+};
+
+static int __initdata gpio2_irqs[4] = {
+ 0,
+ 0,
+ 0,
+ 0,
+};
+
+#ifdef CONFIG_MULTI_IRQ_HANDLER
+/*
+ * Compiling with both non-DT and DT support enabled, will
+ * break asm irq handler used by non-DT boards. Therefore,
+ * we provide a C-style irq handler even for non-DT boards,
+ * if MULTI_IRQ_HANDLER is set.
+ */
+
+static void __iomem *dove_irq_base = IRQ_VIRT_BASE;
+
+static asmlinkage void
+__exception_irq_entry dove_legacy_handle_irq(struct pt_regs *regs)
+{
+ u32 stat;
+
+ stat = readl_relaxed(dove_irq_base + IRQ_CAUSE_LOW_OFF);
+ stat &= readl_relaxed(dove_irq_base + IRQ_MASK_LOW_OFF);
+ if (stat) {
+ unsigned int hwirq = 1 + __fls(stat);
+ handle_IRQ(hwirq, regs);
+ return;
+ }
+ stat = readl_relaxed(dove_irq_base + IRQ_CAUSE_HIGH_OFF);
+ stat &= readl_relaxed(dove_irq_base + IRQ_MASK_HIGH_OFF);
+ if (stat) {
+ unsigned int hwirq = 33 + __fls(stat);
+ handle_IRQ(hwirq, regs);
+ return;
+ }
+}
+#endif
+
+void __init dove_init_irq(void)
+{
+ int i;
+
+ orion_irq_init(1, IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF);
+ orion_irq_init(33, IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF);
+
+#ifdef CONFIG_MULTI_IRQ_HANDLER
+ set_handle_irq(dove_legacy_handle_irq);
+#endif
+
+ /*
+ * Initialize gpiolib for GPIOs 0-71.
+ */
+ orion_gpio_init(NULL, 0, 32, DOVE_GPIO_LO_VIRT_BASE, 0,
+ IRQ_DOVE_GPIO_START, gpio0_irqs);
+
+ orion_gpio_init(NULL, 32, 32, DOVE_GPIO_HI_VIRT_BASE, 0,
+ IRQ_DOVE_GPIO_START + 32, gpio1_irqs);
+
+ orion_gpio_init(NULL, 64, 8, DOVE_GPIO2_VIRT_BASE, 0,
+ IRQ_DOVE_GPIO_START + 64, gpio2_irqs);
+
+ /*
+ * Mask and clear PMU interrupts
+ */
+ writel(0, PMU_INTERRUPT_MASK);
+ writel(0, PMU_INTERRUPT_CAUSE);
+
+ for (i = IRQ_DOVE_PMU_START; i < NR_IRQS; i++) {
+ irq_set_chip_and_handler(i, &pmu_irq_chip, handle_level_irq);
+ irq_set_status_flags(i, IRQ_LEVEL);
+ set_irq_flags(i, IRQF_VALID);
+ }
+ irq_set_chained_handler(IRQ_DOVE_PMU, pmu_irq_handler);
+}