Signed-off-by: Baruch Siach <bar...@tkos.co.il>
---
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-digicolor.c | 135 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 136 insertions(+)
create mode 100644 drivers/irqchip/irq-digicolor.c
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 9516a324be6d..42965d2476bb 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -42,3 +42,4 @@ obj-$(CONFIG_BRCMSTB_L2_IRQ) += irq-brcmstb-l2.o
obj-$(CONFIG_KEYSTONE_IRQ) += irq-keystone.o
obj-$(CONFIG_MIPS_GIC) += irq-mips-gic.o
obj-$(CONFIG_ARCH_MEDIATEK) += irq-mtk-sysirq.o
+obj-$(CONFIG_ARCH_DIGICOLOR) += irq-digicolor.o
diff --git a/drivers/irqchip/irq-digicolor.c b/drivers/irqchip/irq-digicolor.c
new file mode 100644
index 000000000000..9970090821a9
--- /dev/null
+++ b/drivers/irqchip/irq-digicolor.c
@@ -0,0 +1,135 @@
+/*
+ * Conexant Digicolor SoCs IRQ chip driver
+ *
+ * Author: Baruch Siach <bar...@tkos.co.il>
+ *
+ * Copyright (C) 2014 Paradox Innovation Ltd.
+ *
+ * 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 "irqchip.h"
+
+#define UC_IRQ_CONTROL 0x03a4
+
+#define IC_FLAG_CLEAR_LO 0x40
+#define IC_INT0ENABLE_LO 0x50
+#define IC_INT0ENABLE_XLO 0x54
+#define IC_INT0STATUS_LO 0x58
+#define IC_INT0STATUS_XLO 0x5c
+
+static void __iomem *digicolor_irq_base;
+static struct irq_domain *digicolor_irq_domain;
+
+static void __exception_irq_entry digicolor_handle_irq(struct pt_regs *regs)
+{
+ u32 status, hwirq;
+
+ do {
+ status = readl(digicolor_irq_base + IC_INT0STATUS_LO);
+ if (status) {
+ hwirq = ffs(status) - 1;
+ } else {
+ status = readl(digicolor_irq_base + IC_INT0STATUS_XLO);
+ if (status)
+ hwirq = ffs(status) - 1 + 32;
+ else
+ return;
+ }
+
+ handle_domain_irq(digicolor_irq_domain, hwirq, regs);
+ } while (1);
+}
+
+static void digicolor_irq_ack(struct irq_data *irqd)
+{
+ unsigned int irq = irqd_to_hwirq(irqd);
+ unsigned int irq_off = irq % 8;
+ int reg = irq / 8;
+
+ writeb(BIT(irq_off), digicolor_irq_base + IC_FLAG_CLEAR_LO + reg);
+}
+
+static void digicolor_irq_mask(struct irq_data *irqd)
+{
+ unsigned int irq = irqd_to_hwirq(irqd);
+ unsigned int irq_off = irq % 8;
+ int reg = irq / 8;
+ u8 val;
+
+ val = readb(digicolor_irq_base + IC_INT0ENABLE_LO + reg);
+ writeb(val & ~BIT(irq_off),
+ digicolor_irq_base + IC_INT0ENABLE_LO + reg);
+}
+
+static void digicolor_irq_unmask(struct irq_data *irqd)
+{
+ unsigned int irq = irqd_to_hwirq(irqd);
+ unsigned int irq_off = irq % 8;
+ int reg = irq / 8;
+ u8 val;
+
+ val = readb(digicolor_irq_base + IC_INT0ENABLE_LO + reg);
+ writeb(val | BIT(irq_off),
+ digicolor_irq_base + IC_INT0ENABLE_LO + reg);
+}
+
+static struct irq_chip digicolor_irq_chip = {
+ .name = "digicolor_irq",
+ .irq_ack = digicolor_irq_ack,
+ .irq_mask = digicolor_irq_mask,
+ .irq_unmask = digicolor_irq_unmask,
+};
+
+static int digicolor_irq_map(struct irq_domain *d, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ irq_set_chip_and_handler(virq, &digicolor_irq_chip, handle_level_irq);
+ set_irq_flags(virq, IRQF_VALID | IRQF_PROBE);
+
+ return 0;
+}
+
+static struct irq_domain_ops digicolor_irq_ops = {
+ .map = digicolor_irq_map,
+ .xlate = irq_domain_xlate_onecell,
+};
+
+static int __init digicolor_of_init(struct device_node *node,
+ struct device_node *parent)
+{
+ digicolor_irq_base = of_iomap(node, 0);
+ if (!digicolor_irq_base) {
+ pr_err("%s: unable to map IC registers\n", node->full_name);
+ return -ENXIO;
+ }
+
+ /* disable all interrupts */
+ writel(0, digicolor_irq_base + IC_INT0ENABLE_LO);
+ writel(0, digicolor_irq_base + IC_INT0ENABLE_XLO);
+
+ /* channel 1, regular IRQs */
+ writeb(1, digicolor_irq_base + UC_IRQ_CONTROL);
+
+ digicolor_irq_domain = irq_domain_add_linear(node, 64,
+ &digicolor_irq_ops, NULL);
+ if (!digicolor_irq_domain) {
+ pr_err("%s: unable to create IRQ domain\n", node->full_name);
+ return -ENOMEM;
+ }
+
+ set_handle_irq(digicolor_handle_irq);
+
+ return 0;
+}
+IRQCHIP_DECLARE(conexant_digicolor_ic, "cnxt,cx92755-ic", digicolor_of_init);
--
2.1.3
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