Merge tag 'tags/sunxi-support-for-3.8' of git://github.com/mripard/linux into next/soc

From Maxime Ripard:
Allwinner SoC support for 3.8

* tag 'tags/sunxi-support-for-3.8' of git://github.com/mripard/linux:
  ARM: sunxi: Add entry to MAINTAINERS
  ARM: sunxi: Add device tree for the A13 and the Olinuxino board
  ARM: sunxi: Add earlyprintk support
  ARM: sunxi: Add basic support for Allwinner A1x SoCs
  irqchip: sunxi: Add irq controller driver
  clocksource: sunxi: Add Allwinner A1X Timer Driver
  clk: sunxi: Add dummy fixed rate clock for Allwinner A1X SoCs

Signed-off-by: Olof Johansson <olof@lixom.net>

2 files changed, 151 insertions, 0 deletions

diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index e2e6eb5d32f4..02bd37a6187f 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -1,2 +1,3 @@
 obj-$(CONFIG_ARCH_BCM2835) += irq-bcm2835.o
+obj-$(CONFIG_ARCH_SUNXI)   += irq-sunxi.o
 obj-$(CONFIG_VERSATILE_FPGA_IRQ) += irq-versatile-fpga.o
diff --git a/drivers/irqchip/irq-sunxi.c b/drivers/irqchip/irq-sunxi.c
new file mode 100644
index 000000000000..eef41a49acae
--- /dev/null
+++ b/drivers/irqchip/irq-sunxi.c
@@ -0,0 +1,150 @@
+/*
+ * 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 <linux/irqchip/sunxi.h>
+
+#define SUNXI_IRQ_VECTOR_REG            0x00
+#define SUNXI_IRQ_PROTECTION_REG        0x08
+#define SUNXI_IRQ_NMI_CTRL_REG          0x0c
+#define SUNXI_IRQ_PENDING_REG(x)        (0x10 + 0x4 * x)
+#define SUNXI_IRQ_FIQ_PENDING_REG(x)    (0x20 + 0x4 * x)
+#define SUNXI_IRQ_ENABLE_REG(x)         (0x40 + 0x4 * x)
+#define SUNXI_IRQ_MASK_REG(x)           (0x50 + 0x4 * x)
+
+static void __iomem *sunxi_irq_base;
+static struct irq_domain *sunxi_irq_domain;
+
+void sunxi_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(sunxi_irq_base + SUNXI_IRQ_PENDING_REG(reg));
+        writel(val | (1 << irq_off),
+               sunxi_irq_base + SUNXI_IRQ_PENDING_REG(reg));
+}
+
+static void sunxi_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(sunxi_irq_base + SUNXI_IRQ_ENABLE_REG(reg));
+        writel(val & ~(1 << irq_off),
+               sunxi_irq_base + SUNXI_IRQ_ENABLE_REG(reg));
+}
+
+static void sunxi_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(sunxi_irq_base + SUNXI_IRQ_ENABLE_REG(reg));
+        writel(val | (1 << irq_off),
+               sunxi_irq_base + SUNXI_IRQ_ENABLE_REG(reg));
+}
+
+static struct irq_chip sunxi_irq_chip = {
+        .name           = "sunxi_irq",
+        .irq_ack        = sunxi_irq_ack,
+        .irq_mask       = sunxi_irq_mask,
+        .irq_unmask     = sunxi_irq_unmask,
+};
+
+static int sunxi_irq_map(struct irq_domain *d, unsigned int virq,
+                         irq_hw_number_t hw)
+{
+        irq_set_chip_and_handler(virq, &sunxi_irq_chip,
+                                 handle_level_irq);
+        set_irq_flags(virq, IRQF_VALID | IRQF_PROBE);
+
+        return 0;
+}
+
+static struct irq_domain_ops sunxi_irq_ops = {
+        .map = sunxi_irq_map,
+        .xlate = irq_domain_xlate_onecell,
+};
+
+static int __init sunxi_of_init(struct device_node *node,
+                                struct device_node *parent)
+{
+        sunxi_irq_base = of_iomap(node, 0);
+        if (!sunxi_irq_base)
+                panic("%s: unable to map IC registers\n",
+                        node->full_name);
+
+        /* Disable all interrupts */
+        writel(0, sunxi_irq_base + SUNXI_IRQ_ENABLE_REG(0));
+        writel(0, sunxi_irq_base + SUNXI_IRQ_ENABLE_REG(1));
+        writel(0, sunxi_irq_base + SUNXI_IRQ_ENABLE_REG(2));
+
+        /* Mask all the interrupts */
+        writel(0, sunxi_irq_base + SUNXI_IRQ_MASK_REG(0));
+        writel(0, sunxi_irq_base + SUNXI_IRQ_MASK_REG(1));
+        writel(0, sunxi_irq_base + SUNXI_IRQ_MASK_REG(2));
+
+        /* Clear all the pending interrupts */
+        writel(0xffffffff, sunxi_irq_base + SUNXI_IRQ_PENDING_REG(0));
+        writel(0xffffffff, sunxi_irq_base + SUNXI_IRQ_PENDING_REG(1));
+        writel(0xffffffff, sunxi_irq_base + SUNXI_IRQ_PENDING_REG(2));
+
+        /* Enable protection mode */
+        writel(0x01, sunxi_irq_base + SUNXI_IRQ_PROTECTION_REG);
+
+        /* Configure the external interrupt source type */
+        writel(0x00, sunxi_irq_base + SUNXI_IRQ_NMI_CTRL_REG);
+
+        sunxi_irq_domain = irq_domain_add_linear(node, 3 * 32,
+                                                 &sunxi_irq_ops, NULL);
+        if (!sunxi_irq_domain)
+                panic("%s: unable to create IRQ domain\n", node->full_name);
+
+        return 0;
+}
+
+static struct of_device_id sunxi_irq_dt_ids[] __initconst = {
+        { .compatible = "allwinner,sunxi-ic", .data = sunxi_of_init }
+};
+
+void __init sunxi_init_irq(void)
+{
+        of_irq_init(sunxi_irq_dt_ids);
+}
+
+asmlinkage void __exception_irq_entry sunxi_handle_irq(struct pt_regs *regs)
+{
+        u32 irq, hwirq;
+
+        hwirq = readl(sunxi_irq_base + SUNXI_IRQ_VECTOR_REG) >> 2;
+        while (hwirq != 0) {
+                irq = irq_find_mapping(sunxi_irq_domain, hwirq);
+                handle_IRQ(irq, regs);
+                hwirq = readl(sunxi_irq_base + SUNXI_IRQ_VECTOR_REG) >> 2;
+        }
+}