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Message-Id: <20190124032730.18237-2-jiaxun.yang@flygoat.com>
Date: Thu, 24 Jan 2019 11:27:29 +0800
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: linux-mips@...r.kernel.org
Cc: tglx@...utronix.de, jason@...edaemon.net, marc.zyngier@....com,
robh+dt@...nel.org, mark.rutland@....com,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH v3 1/2] irqchip: Add driver for Loongson-1 interrupt controller
This controller appeared on Loongson-1 family MCUs
including Loongson-1B and Loongson-1C.
Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
drivers/irqchip/Kconfig | 9 ++
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-ls1x.c | 176 +++++++++++++++++++++++++++++++++++++
3 files changed, 186 insertions(+)
create mode 100644 drivers/irqchip/irq-ls1x.c
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 3d1e60779078..5dcb5456cd14 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -406,6 +406,15 @@ config IMX_IRQSTEER
help
Support for the i.MX IRQSTEER interrupt multiplexer/remapper.
+config LS1X_IRQ
+ bool "Loongson-1 Interrupt Controller"
+ depends on MACH_LOONGSON32
+ default y
+ select IRQ_DOMAIN
+ select GENERIC_IRQ_CHIP
+ help
+ Support for the Loongson-1 platform Interrupt Controller.
+
endmenu
config SIFIVE_PLIC
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index c93713d24b86..7acd0e36d0b4 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -94,3 +94,4 @@ obj-$(CONFIG_CSKY_APB_INTC) += irq-csky-apb-intc.o
obj-$(CONFIG_SIFIVE_PLIC) += irq-sifive-plic.o
obj-$(CONFIG_IMX_IRQSTEER) += irq-imx-irqsteer.o
obj-$(CONFIG_MADERA_IRQ) += irq-madera.o
+obj-$(CONFIG_LS1X_IRQ) += irq-ls1x.o
diff --git a/drivers/irqchip/irq-ls1x.c b/drivers/irqchip/irq-ls1x.c
new file mode 100644
index 000000000000..de92ca04cf9f
--- /dev/null
+++ b/drivers/irqchip/irq-ls1x.c
@@ -0,0 +1,176 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019, Jiaxun Yang <jiaxun.yang@...goat.com>
+ * Loongson-1 platform IRQ support
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/irqchip.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/io.h>
+#include <linux/irqchip/chained_irq.h>
+
+#include <asm/mach-loongson32/irq.h>
+
+
+#define MAX_CHIPS 5
+#define LS_REG_INTC_STATUS 0x00
+#define LS_REG_INTC_EN 0x04
+#define LS_REG_INTC_SET 0x08
+#define LS_REG_INTC_CLR 0x0c
+#define LS_REG_INTC_POL 0x10
+#define LS_REG_INTC_EDGE 0x14
+#define CHIP_SIZE 0x18
+
+static void ls_chained_handle_irq(struct irq_desc *desc)
+{
+ struct irq_chip_generic *gc = irq_desc_get_handler_data(desc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ u32 pending;
+
+ chained_irq_enter(chip, desc);
+ pending = readl(gc->reg_base + LS_REG_INTC_STATUS) &
+ readl(gc->reg_base + LS_REG_INTC_EN);
+
+ if (!pending) {
+ spurious_interrupt();
+ chained_irq_exit(chip, desc);
+ return;
+ }
+
+ while (pending) {
+ int bit = __ffs(pending);
+
+ generic_handle_irq(gc->irq_base + bit);
+ pending &= ~BIT(bit);
+ }
+
+ chained_irq_exit(chip, desc);
+}
+
+static void ls_intc_set_bit(struct irq_chip_generic *gc,
+ unsigned int offset,
+ u32 mask, bool set)
+{
+ if (set)
+ writel(readl(gc->reg_base + offset) | mask,
+ gc->reg_base + offset);
+ else
+ writel(readl(gc->reg_base + offset) & ~mask,
+ gc->reg_base + offset);
+}
+
+static int ls_intc_set_type(struct irq_data *data, unsigned int type)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
+ u32 mask = data->mask;
+
+ switch (type) {
+ case IRQ_TYPE_LEVEL_HIGH:
+ ls_intc_set_bit(gc, LS_REG_INTC_EDGE, mask, false);
+ ls_intc_set_bit(gc, LS_REG_INTC_POL, mask, true);
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ ls_intc_set_bit(gc, LS_REG_INTC_EDGE, mask, false);
+ ls_intc_set_bit(gc, LS_REG_INTC_POL, mask, false);
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ ls_intc_set_bit(gc, LS_REG_INTC_EDGE, mask, true);
+ ls_intc_set_bit(gc, LS_REG_INTC_POL, mask, true);
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ ls_intc_set_bit(gc, LS_REG_INTC_EDGE, mask, true);
+ ls_intc_set_bit(gc, LS_REG_INTC_POL, mask, false);
+ break;
+ case IRQ_TYPE_NONE:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+
+static int __init ls_intc_of_init(struct device_node *node,
+ struct device_node *parent)
+{
+ struct irq_chip_generic *gc[MAX_CHIPS];
+ struct irq_chip_type *ct;
+ struct irq_domain *domain;
+ void __iomem *base;
+ int parent_irq[MAX_CHIPS], err = 0;
+ unsigned int i = 0;
+
+ unsigned int num_chips = of_irq_count(node);
+
+ base = of_iomap(node, 0);
+ if (!base)
+ return -ENODEV;
+
+ for (i = 0; i < num_chips; i++) {
+ /* Mask all irqs */
+ writel(0x0, base + (i * CHIP_SIZE) +
+ LS_REG_INTC_EN);
+
+ /* Set all irqs to high level triggered */
+ writel(0xffffffff, base + (i * CHIP_SIZE) +
+ LS_REG_INTC_POL);
+
+ parent_irq[i] = irq_of_parse_and_map(node, i);
+
+ if (!parent_irq[i]) {
+ pr_warn("unable to get parent irq for irqchip %u\n", i);
+ goto out_err;
+ }
+
+ gc[i] = irq_alloc_generic_chip("INTC", 1,
+ LS1X_IRQ_BASE + (i * 32),
+ base + (i * CHIP_SIZE),
+ handle_level_irq);
+
+ ct = gc[i]->chip_types;
+ ct->regs.mask = LS_REG_INTC_EN;
+ ct->regs.ack = LS_REG_INTC_CLR;
+ ct->chip.irq_unmask = irq_gc_mask_set_bit;
+ ct->chip.irq_mask = irq_gc_mask_clr_bit;
+ ct->chip.irq_ack = irq_gc_ack_set_bit;
+ ct->chip.irq_set_type = ls_intc_set_type;
+
+ irq_setup_generic_chip(gc[i], IRQ_MSK(32), 0, 0,
+ IRQ_NOPROBE | IRQ_LEVEL);
+ }
+
+ domain = irq_domain_add_legacy(node, num_chips * 32, LS1X_IRQ_BASE, 0,
+ &irq_domain_simple_ops, NULL);
+ if (!domain) {
+ pr_warn("unable to register IRQ domain\n");
+ err = -EINVAL;
+ goto out_err;
+ }
+
+ for (i = 0; i < num_chips; i++)
+ irq_set_chained_handler_and_data(parent_irq[i],
+ ls_chained_handle_irq, gc[i]);
+
+ pr_info("ls1x-irq: %u chips registered\n", num_chips);
+
+ return 0;
+
+out_err:
+ for (i = 0; i < MAX_CHIPS; i++) {
+ if (gc[i])
+ irq_destroy_generic_chip(gc[i], IRQ_MSK(32),
+ IRQ_NOPROBE | IRQ_LEVEL, 0);
+ if (parent_irq[i])
+ irq_dispose_mapping(parent_irq[i]);
+ }
+ return err;
+}
+
+IRQCHIP_DECLARE(ls1x_intc, "loongson,ls1x-intc", ls_intc_of_init);
--
2.20.1
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