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path: root/drivers/irqchip/irq-sun4i.c
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Diffstat (limited to 'drivers/irqchip/irq-sun4i.c')
-rw-r--r--drivers/irqchip/irq-sun4i.c149
1 files changed, 149 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-sun4i.c b/drivers/irqchip/irq-sun4i.c
new file mode 100644
index 00000000000..b66d4ae0689
--- /dev/null
+++ b/drivers/irqchip/irq-sun4i.c
@@ -0,0 +1,149 @@
+/*
+ * Allwinner A1X SoCs IRQ chip driver.
+ *
+ * Copyright (C) 2012 Maxime Ripard
+ *
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * Based on code from
+ * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
+ * Benn Huang <benn@allwinnertech.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/io.h>
+#include <linux/irq.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+
+#include <asm/exception.h>
+#include <asm/mach/irq.h>
+
+#include "irqchip.h"
+
+#define SUN4I_IRQ_VECTOR_REG 0x00
+#define SUN4I_IRQ_PROTECTION_REG 0x08
+#define SUN4I_IRQ_NMI_CTRL_REG 0x0c
+#define SUN4I_IRQ_PENDING_REG(x) (0x10 + 0x4 * x)
+#define SUN4I_IRQ_FIQ_PENDING_REG(x) (0x20 + 0x4 * x)
+#define SUN4I_IRQ_ENABLE_REG(x) (0x40 + 0x4 * x)
+#define SUN4I_IRQ_MASK_REG(x) (0x50 + 0x4 * x)
+
+static void __iomem *sun4i_irq_base;
+static struct irq_domain *sun4i_irq_domain;
+
+static asmlinkage void __exception_irq_entry sun4i_handle_irq(struct pt_regs *regs);
+
+void sun4i_irq_ack(struct irq_data *irqd)
+{
+ unsigned int irq = irqd_to_hwirq(irqd);
+ unsigned int irq_off = irq % 32;
+ int reg = irq / 32;
+ u32 val;
+
+ val = readl(sun4i_irq_base + SUN4I_IRQ_PENDING_REG(reg));
+ writel(val | (1 << irq_off),
+ sun4i_irq_base + SUN4I_IRQ_PENDING_REG(reg));
+}
+
+static void sun4i_irq_mask(struct irq_data *irqd)
+{
+ unsigned int irq = irqd_to_hwirq(irqd);
+ unsigned int irq_off = irq % 32;
+ int reg = irq / 32;
+ u32 val;
+
+ val = readl(sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
+ writel(val & ~(1 << irq_off),
+ sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
+}
+
+static void sun4i_irq_unmask(struct irq_data *irqd)
+{
+ unsigned int irq = irqd_to_hwirq(irqd);
+ unsigned int irq_off = irq % 32;
+ int reg = irq / 32;
+ u32 val;
+
+ val = readl(sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
+ writel(val | (1 << irq_off),
+ sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
+}
+
+static struct irq_chip sun4i_irq_chip = {
+ .name = "sun4i_irq",
+ .irq_ack = sun4i_irq_ack,
+ .irq_mask = sun4i_irq_mask,
+ .irq_unmask = sun4i_irq_unmask,
+};
+
+static int sun4i_irq_map(struct irq_domain *d, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ irq_set_chip_and_handler(virq, &sun4i_irq_chip,
+ handle_level_irq);
+ set_irq_flags(virq, IRQF_VALID | IRQF_PROBE);
+
+ return 0;
+}
+
+static struct irq_domain_ops sun4i_irq_ops = {
+ .map = sun4i_irq_map,
+ .xlate = irq_domain_xlate_onecell,
+};
+
+static int __init sun4i_of_init(struct device_node *node,
+ struct device_node *parent)
+{
+ sun4i_irq_base = of_iomap(node, 0);
+ if (!sun4i_irq_base)
+ panic("%s: unable to map IC registers\n",
+ node->full_name);
+
+ /* Disable all interrupts */
+ writel(0, sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(0));
+ writel(0, sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(1));
+ writel(0, sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(2));
+
+ /* Mask all the interrupts */
+ writel(0, sun4i_irq_base + SUN4I_IRQ_MASK_REG(0));
+ writel(0, sun4i_irq_base + SUN4I_IRQ_MASK_REG(1));
+ writel(0, sun4i_irq_base + SUN4I_IRQ_MASK_REG(2));
+
+ /* Clear all the pending interrupts */
+ writel(0xffffffff, sun4i_irq_base + SUN4I_IRQ_PENDING_REG(0));
+ writel(0xffffffff, sun4i_irq_base + SUN4I_IRQ_PENDING_REG(1));
+ writel(0xffffffff, sun4i_irq_base + SUN4I_IRQ_PENDING_REG(2));
+
+ /* Enable protection mode */
+ writel(0x01, sun4i_irq_base + SUN4I_IRQ_PROTECTION_REG);
+
+ /* Configure the external interrupt source type */
+ writel(0x00, sun4i_irq_base + SUN4I_IRQ_NMI_CTRL_REG);
+
+ sun4i_irq_domain = irq_domain_add_linear(node, 3 * 32,
+ &sun4i_irq_ops, NULL);
+ if (!sun4i_irq_domain)
+ panic("%s: unable to create IRQ domain\n", node->full_name);
+
+ set_handle_irq(sun4i_handle_irq);
+
+ return 0;
+}
+IRQCHIP_DECLARE(allwinner_sun4i_ic, "allwinner,sun4i-ic", sun4i_of_init);
+
+static asmlinkage void __exception_irq_entry sun4i_handle_irq(struct pt_regs *regs)
+{
+ u32 irq, hwirq;
+
+ hwirq = readl(sun4i_irq_base + SUN4I_IRQ_VECTOR_REG) >> 2;
+ while (hwirq != 0) {
+ irq = irq_find_mapping(sun4i_irq_domain, hwirq);
+ handle_IRQ(irq, regs);
+ hwirq = readl(sun4i_irq_base + SUN4I_IRQ_VECTOR_REG) >> 2;
+ }
+}