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-rw-r--r--drivers/irqchip/Kconfig9
-rw-r--r--drivers/irqchip/Makefile2
-rw-r--r--drivers/irqchip/irq-sunxi.c150
-rw-r--r--drivers/irqchip/irq-versatile-fpga.c204
4 files changed, 364 insertions, 1 deletions
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 1bb8bf6d7fd..62ca575701d 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -1 +1,8 @@
-# empty
+config VERSATILE_FPGA_IRQ
+ bool
+ select IRQ_DOMAIN
+
+config VERSATILE_FPGA_IRQ_NR
+ int
+ default 4
+ depends on VERSATILE_FPGA_IRQ
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 054321db435..02bd37a6187 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -1 +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 00000000000..eef41a49aca
--- /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;
+ }
+}
diff --git a/drivers/irqchip/irq-versatile-fpga.c b/drivers/irqchip/irq-versatile-fpga.c
new file mode 100644
index 00000000000..789b3e52693
--- /dev/null
+++ b/drivers/irqchip/irq-versatile-fpga.c
@@ -0,0 +1,204 @@
+/*
+ * Support for Versatile FPGA-based IRQ controllers
+ */
+#include <linux/bitops.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/irqchip/versatile-fpga.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include <asm/exception.h>
+#include <asm/mach/irq.h>
+
+#define IRQ_STATUS 0x00
+#define IRQ_RAW_STATUS 0x04
+#define IRQ_ENABLE_SET 0x08
+#define IRQ_ENABLE_CLEAR 0x0c
+#define INT_SOFT_SET 0x10
+#define INT_SOFT_CLEAR 0x14
+#define FIQ_STATUS 0x20
+#define FIQ_RAW_STATUS 0x24
+#define FIQ_ENABLE 0x28
+#define FIQ_ENABLE_SET 0x28
+#define FIQ_ENABLE_CLEAR 0x2C
+
+/**
+ * struct fpga_irq_data - irq data container for the FPGA IRQ controller
+ * @base: memory offset in virtual memory
+ * @chip: chip container for this instance
+ * @domain: IRQ domain for this instance
+ * @valid: mask for valid IRQs on this controller
+ * @used_irqs: number of active IRQs on this controller
+ */
+struct fpga_irq_data {
+ void __iomem *base;
+ struct irq_chip chip;
+ u32 valid;
+ struct irq_domain *domain;
+ u8 used_irqs;
+};
+
+/* we cannot allocate memory when the controllers are initially registered */
+static struct fpga_irq_data fpga_irq_devices[CONFIG_VERSATILE_FPGA_IRQ_NR];
+static int fpga_irq_id;
+
+static void fpga_irq_mask(struct irq_data *d)
+{
+ struct fpga_irq_data *f = irq_data_get_irq_chip_data(d);
+ u32 mask = 1 << d->hwirq;
+
+ writel(mask, f->base + IRQ_ENABLE_CLEAR);
+}
+
+static void fpga_irq_unmask(struct irq_data *d)
+{
+ struct fpga_irq_data *f = irq_data_get_irq_chip_data(d);
+ u32 mask = 1 << d->hwirq;
+
+ writel(mask, f->base + IRQ_ENABLE_SET);
+}
+
+static void fpga_irq_handle(unsigned int irq, struct irq_desc *desc)
+{
+ struct fpga_irq_data *f = irq_desc_get_handler_data(desc);
+ u32 status = readl(f->base + IRQ_STATUS);
+
+ if (status == 0) {
+ do_bad_IRQ(irq, desc);
+ return;
+ }
+
+ do {
+ irq = ffs(status) - 1;
+ status &= ~(1 << irq);
+ generic_handle_irq(irq_find_mapping(f->domain, irq));
+ } while (status);
+}
+
+/*
+ * Handle each interrupt in a single FPGA IRQ controller. Returns non-zero
+ * if we've handled at least one interrupt. This does a single read of the
+ * status register and handles all interrupts in order from LSB first.
+ */
+static int handle_one_fpga(struct fpga_irq_data *f, struct pt_regs *regs)
+{
+ int handled = 0;
+ int irq;
+ u32 status;
+
+ while ((status = readl(f->base + IRQ_STATUS))) {
+ irq = ffs(status) - 1;
+ handle_IRQ(irq_find_mapping(f->domain, irq), regs);
+ handled = 1;
+ }
+
+ return handled;
+}
+
+/*
+ * Keep iterating over all registered FPGA IRQ controllers until there are
+ * no pending interrupts.
+ */
+asmlinkage void __exception_irq_entry fpga_handle_irq(struct pt_regs *regs)
+{
+ int i, handled;
+
+ do {
+ for (i = 0, handled = 0; i < fpga_irq_id; ++i)
+ handled |= handle_one_fpga(&fpga_irq_devices[i], regs);
+ } while (handled);
+}
+
+static int fpga_irqdomain_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ struct fpga_irq_data *f = d->host_data;
+
+ /* Skip invalid IRQs, only register handlers for the real ones */
+ if (!(f->valid & BIT(hwirq)))
+ return -ENOTSUPP;
+ irq_set_chip_data(irq, f);
+ irq_set_chip_and_handler(irq, &f->chip,
+ handle_level_irq);
+ set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+ return 0;
+}
+
+static struct irq_domain_ops fpga_irqdomain_ops = {
+ .map = fpga_irqdomain_map,
+ .xlate = irq_domain_xlate_onetwocell,
+};
+
+void __init fpga_irq_init(void __iomem *base, const char *name, int irq_start,
+ int parent_irq, u32 valid, struct device_node *node)
+{
+ struct fpga_irq_data *f;
+ int i;
+
+ if (fpga_irq_id >= ARRAY_SIZE(fpga_irq_devices)) {
+ pr_err("%s: too few FPGA IRQ controllers, increase CONFIG_PLAT_VERSATILE_FPGA_IRQ_NR\n", __func__);
+ return;
+ }
+ f = &fpga_irq_devices[fpga_irq_id];
+ f->base = base;
+ f->chip.name = name;
+ f->chip.irq_ack = fpga_irq_mask;
+ f->chip.irq_mask = fpga_irq_mask;
+ f->chip.irq_unmask = fpga_irq_unmask;
+ f->valid = valid;
+
+ if (parent_irq != -1) {
+ irq_set_handler_data(parent_irq, f);
+ irq_set_chained_handler(parent_irq, fpga_irq_handle);
+ }
+
+ /* This will also allocate irq descriptors */
+ f->domain = irq_domain_add_simple(node, fls(valid), irq_start,
+ &fpga_irqdomain_ops, f);
+
+ /* This will allocate all valid descriptors in the linear case */
+ for (i = 0; i < fls(valid); i++)
+ if (valid & BIT(i)) {
+ if (!irq_start)
+ irq_create_mapping(f->domain, i);
+ f->used_irqs++;
+ }
+
+ pr_info("FPGA IRQ chip %d \"%s\" @ %p, %u irqs\n",
+ fpga_irq_id, name, base, f->used_irqs);
+
+ fpga_irq_id++;
+}
+
+#ifdef CONFIG_OF
+int __init fpga_irq_of_init(struct device_node *node,
+ struct device_node *parent)
+{
+ struct fpga_irq_data *f;
+ void __iomem *base;
+ u32 clear_mask;
+ u32 valid_mask;
+
+ if (WARN_ON(!node))
+ return -ENODEV;
+
+ base = of_iomap(node, 0);
+ WARN(!base, "unable to map fpga irq registers\n");
+
+ if (of_property_read_u32(node, "clear-mask", &clear_mask))
+ clear_mask = 0;
+
+ if (of_property_read_u32(node, "valid-mask", &valid_mask))
+ valid_mask = 0;
+
+ fpga_irq_init(base, node->name, 0, -1, valid_mask, node);
+
+ writel(clear_mask, base + IRQ_ENABLE_CLEAR);
+ writel(clear_mask, base + FIQ_ENABLE_CLEAR);
+
+ return 0;
+}
+#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-29 10:52:18 +0000