[PATCH] irqchip: Add TB10x interrupt controller driver
From: Christian Ruppert
Date: Thu Apr 11 2013 - 09:18:25 EST
The SOC interrupt controller driver for the Abilis Systems TB10x series of
SOCs based on ARC700 CPUs.
Signed-off-by: Christian Ruppert <christian.ruppert@xxxxxxxxxx>
Signed-off-by: Pierrick Hascoet <pierrick.hascoet@xxxxxxxxxx>
---
.../interrupt-controller/abilis,tb10x_ictl.txt | 38 +++
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-tb10x.c | 254 ++++++++++++++++++++
3 files changed, 293 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/interrupt-controller/abilis,tb10x_ictl.txt
create mode 100644 drivers/irqchip/irq-tb10x.c
diff --git a/Documentation/devicetree/bindings/interrupt-controller/abilis,tb10x_ictl.txt b/Documentation/devicetree/bindings/interrupt-controller/abilis,tb10x_ictl.txt
new file mode 100644
index 0000000..bc292cd
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/abilis,tb10x_ictl.txt
@@ -0,0 +1,38 @@
+TB10x Top Level Interrupt Controller
+====================================
+
+The Abilis TB10x SOC contains a custom interrupt controller. It performs
+one-to-one mapping of external interrupt sources to CPU interrupts and
+provides support for reconfigurable trigger modes.
+
+Required properties
+-------------------
+
+- compatible: Should be "abilis,tb10x_ictl"
+- reg: specifies physical base address and size of register range.
+- interrupt-congroller: Identifies the node as an interrupt controller.
+- #interrupt cells: Specifies the number of cells used to encode an interrupt
+ source connected to this controller. The value shall be 2.
+- interrupt-parent: Specifies the parent interrupt controller.
+- interrupts: Specifies the list of interrupt lines which are handled by
+ the interrupt controller in the parent controller's notation. Interrupts
+ are mapped one-to-one to parent interrupts.
+
+Example
+-------
+
+intc: interrupt-controller { /* Parent interrupt controller */
+ interrupt-controller;
+ #interrupt-cells = <1>; /* For example below */
+ /* ... */
+};
+
+tb10x_ictl: pic@2000 { /* TB10x interrupt controller */
+ compatible = "abilis,tb10x_ictl";
+ reg = <0x2000 0x20>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ interrupt-parent = <&intc>;
+ interrupts = <5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
+ 20 21 22 23 24 25 26 27 28 29 30 31>;
+};
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 98e3b87..ab64cc2 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_METAG) += irq-metag-ext.o
obj-$(CONFIG_METAG_PERFCOUNTER_IRQS) += irq-metag.o
obj-$(CONFIG_ARCH_SUNXI) += irq-sunxi.o
obj-$(CONFIG_ARCH_SPEAR3XX) += spear-shirq.o
+obj-$(CONFIG_ARC_PLAT_TB10X) += irq-tb10x.o
obj-$(CONFIG_ARM_GIC) += irq-gic.o
obj-$(CONFIG_ARM_VIC) += irq-vic.o
obj-$(CONFIG_VERSATILE_FPGA_IRQ) += irq-versatile-fpga.o
diff --git a/drivers/irqchip/irq-tb10x.c b/drivers/irqchip/irq-tb10x.c
new file mode 100644
index 0000000..542de1e
--- /dev/null
+++ b/drivers/irqchip/irq-tb10x.c
@@ -0,0 +1,254 @@
+/*
+ * Abilis Systems interrupt controller driver
+ *
+ * Copyright (C) Abilis Systems 2012
+ *
+ * Author: Christian Ruppert <christian.ruppert@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include "../../drivers/irqchip/irqchip.h"
+
+#define AB_IRQCTL_INT_ENABLE (0x00)
+#define AB_IRQCTL_INT_STATUS (0x04)
+#define AB_IRQCTL_SRC_MODE (0x08)
+#define AB_IRQCTL_SRC_POLARITY (0x0C)
+#define AB_IRQCTL_INT_MODE (0x10)
+#define AB_IRQCTL_INT_POLARITY (0x14)
+#define AB_IRQCTL_INT_FORCE (0x18)
+
+struct tb10x_ictl {
+ void *base;
+ struct irq_domain *domain;
+};
+
+static inline void ab_irqctl_writereg(struct tb10x_ictl *ictl, u32 reg,
+ u32 val)
+{
+ iowrite32(val, (u32 *)(ictl->base + reg));
+}
+
+static inline u32 ab_irqctl_readreg(struct tb10x_ictl *ictl, u32 reg)
+{
+ return ioread32((u32 *)(ictl->base + reg));
+}
+
+static int tb10x_irq_set_type(struct irq_data *data, unsigned int flow_type)
+{
+ struct tb10x_ictl *ictl = irq_data_get_irq_chip_data(data);
+ unsigned int irq = data->irq;
+ unsigned int hwirq = irqd_to_hwirq(data);
+ uint32_t im, mod, pol;
+
+ im = 1UL << hwirq;
+
+ mod = ab_irqctl_readreg(ictl, AB_IRQCTL_SRC_MODE) | im;
+ pol = ab_irqctl_readreg(ictl, AB_IRQCTL_SRC_POLARITY) | im;
+
+ switch (flow_type & IRQF_TRIGGER_MASK) {
+ case IRQ_TYPE_EDGE_FALLING:
+ pol ^= im;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ mod ^= im;
+ break;
+ case IRQ_TYPE_NONE:
+ flow_type = IRQ_TYPE_LEVEL_LOW;
+ case IRQ_TYPE_LEVEL_LOW:
+ mod ^= im;
+ pol ^= im;
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ break;
+ default:
+ pr_err("%s: Cannot assign multiple trigger modes to IRQ %d.\n",
+ __func__, irq);
+ return -EBADR;
+ }
+
+ irqd_set_trigger_type(data, flow_type);
+
+ ab_irqctl_writereg(ictl, AB_IRQCTL_SRC_MODE, mod);
+ ab_irqctl_writereg(ictl, AB_IRQCTL_SRC_POLARITY, pol);
+ ab_irqctl_writereg(ictl, AB_IRQCTL_INT_STATUS, im);
+
+ if (flow_type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
+ __irq_set_handler_locked(irq, handle_level_irq);
+ else
+ __irq_set_handler_locked(irq, handle_edge_irq);
+
+ return IRQ_SET_MASK_OK;
+}
+
+static void tb10x_irq_unmask(struct irq_data *data)
+{
+ struct tb10x_ictl *ictl = irq_data_get_irq_chip_data(data);
+ unsigned int hwirq = irqd_to_hwirq(data);
+
+ ab_irqctl_writereg(ictl, AB_IRQCTL_INT_ENABLE,
+ ab_irqctl_readreg(ictl, AB_IRQCTL_INT_ENABLE) | (1 << hwirq));
+}
+
+static void tb10x_irq_mask(struct irq_data *data)
+{
+ struct tb10x_ictl *ictl = irq_data_get_irq_chip_data(data);
+ unsigned int hwirq = irqd_to_hwirq(data);
+
+ ab_irqctl_writereg(ictl, AB_IRQCTL_INT_ENABLE,
+ ab_irqctl_readreg(ictl, AB_IRQCTL_INT_ENABLE) & ~(1 << hwirq));
+}
+
+static void tb10x_irq_ack(struct irq_data *data)
+{
+ struct tb10x_ictl *ictl = irq_data_get_irq_chip_data(data);
+ unsigned int hwirq = irqd_to_hwirq(data);
+
+ ab_irqctl_writereg(ictl, AB_IRQCTL_INT_STATUS,
+ ab_irqctl_readreg(ictl, AB_IRQCTL_SRC_MODE)
+ & (1 << hwirq));
+}
+
+static struct irq_chip irq_tb10x_chip = {
+ .name = "TB10x-ICTL",
+ .irq_ack = tb10x_irq_ack,
+ .irq_mask = tb10x_irq_mask,
+ .irq_unmask = tb10x_irq_unmask,
+ .irq_set_type = tb10x_irq_set_type,
+};
+
+static int tb10x_irq_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hw)
+{
+ irq_set_chip_data(irq, d->host_data);
+ irq_set_chip_and_handler(irq, &irq_tb10x_chip, handle_level_irq);
+
+ return 0;
+}
+
+static int tb10x_irq_xlate(struct irq_domain *d, struct device_node *node,
+ const u32 *intspec, unsigned int intsize,
+ unsigned long *out_hwirq, unsigned int *out_type)
+{
+ static const unsigned int tb10x_xlate_types[] = {
+ IRQ_TYPE_EDGE_RISING,
+ IRQ_TYPE_LEVEL_LOW,
+ IRQ_TYPE_LEVEL_HIGH,
+ IRQ_TYPE_EDGE_FALLING,
+ };
+
+ if (WARN_ON(intsize != 2))
+ return -EINVAL;
+
+ if (WARN_ON(intspec[1] >= ARRAY_SIZE(tb10x_xlate_types)))
+ return -EINVAL;
+
+ *out_hwirq = intspec[0];
+ *out_type = tb10x_xlate_types[intspec[1]];
+ return 0;
+}
+
+static struct irq_domain_ops irq_tb10x_domain_ops = {
+ .map = tb10x_irq_map,
+ .xlate = tb10x_irq_xlate,
+};
+
+static void tb10x_irq_cascade(unsigned int irq, struct irq_desc *desc)
+{
+ struct tb10x_ictl *ictl = irq_desc_get_handler_data(desc);
+
+ generic_handle_irq(irq_find_mapping(ictl->domain, irq));
+}
+
+static int __init of_tb10x_init_irq(struct device_node *ictl,
+ struct device_node *parent)
+{
+ int i;
+ int ret;
+ int nrirqs = of_irq_count(ictl);
+ struct resource mem;
+ struct tb10x_ictl *ic;
+
+ ic = kmalloc(sizeof(struct tb10x_ictl), GFP_KERNEL);
+ if (!ic)
+ return -ENOMEM;
+
+ ic->domain = irq_domain_add_tree(ictl, &irq_tb10x_domain_ops, ic);
+ if (!ic->domain) {
+ ret = -ENOMEM;
+ goto irq_domain_add_fail;
+ }
+
+ if (of_address_to_resource(ictl, 0, &mem)) {
+ pr_err("%s: No registers declared in DeviceTree.\n",
+ ictl->name);
+ ret = -EINVAL;
+ goto of_reg_get_fail;
+ }
+
+ if (!request_mem_region(mem.start, resource_size(&mem),
+ irq_tb10x_chip.name)) {
+ ret = -EBUSY;
+ goto reg_request_fail;
+ }
+
+ ic->base = ioremap(mem.start, resource_size(&mem));
+ if (!ic->base) {
+ ret = -EBUSY;
+ goto ioremap_fail;
+ }
+
+ for (i = 0; i < nrirqs; i++) {
+ unsigned int irq, hwirq;
+ struct irq_data *irq_data;
+
+ irq = irq_of_parse_and_map(ictl, i);
+ irq_data = irq_get_irq_data(irq);
+
+ if (!irq_data)
+ continue;
+
+ hwirq = irqd_to_hwirq(irq_data);
+
+ if (irq != hwirq)
+ panic("IRQ %d maps to hardware IRQ %d.\n", irq, hwirq);
+
+ irq_set_handler_data(irq, ic);
+ irq_set_chained_handler(irq, tb10x_irq_cascade);
+ }
+
+ ab_irqctl_writereg(ic, AB_IRQCTL_INT_ENABLE, 0);
+ ab_irqctl_writereg(ic, AB_IRQCTL_INT_MODE, 0);
+ ab_irqctl_writereg(ic, AB_IRQCTL_INT_POLARITY, 0);
+ ab_irqctl_writereg(ic, AB_IRQCTL_INT_STATUS, ~0UL);
+
+ return 0;
+
+ioremap_fail:
+ release_mem_region(mem.start, resource_size(&mem));
+reg_request_fail:
+of_reg_get_fail:
+ irq_domain_remove(ic->domain);
+irq_domain_add_fail:
+ kfree(ic);
+ return ret;
+}
+IRQCHIP_DECLARE(tb10x_intc, "abilis,tb10x_ictl", of_tb10x_init_irq);
--
1.7.1
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