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Message-Id: <20210104131755.2979203-3-bert@biot.com>
Date: Mon, 4 Jan 2021 14:17:55 +0100
From: Bert Vermeulen <bert@...t.com>
To: Thomas Gleixner <tglx@...utronix.de>,
Marc Zyngier <maz@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Birger Koblitz <mail@...ger-koblitz.de>,
John Crispin <john@...ozen.org>, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org
Cc: Bert Vermeulen <bert@...t.com>
Subject: [PATCH v2 2/2] irqchip: Add support for Realtek RTL838x/RTL839x IRQ controller
This is a standard IRQ driver with only status and mask registers.
The mapping from SoC interrupts (18-31) to MIPS core interrupts is
done via an interrupt-map in device tree.
Signed-off-by: Bert Vermeulen <bert@...t.com>
---
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-realtek-rtl.c | 180 ++++++++++++++++++++++++++++++
2 files changed, 181 insertions(+)
create mode 100644 drivers/irqchip/irq-realtek-rtl.c
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 0ac93bfaec61..4fc1086bed7e 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -113,3 +113,4 @@ obj-$(CONFIG_LOONGSON_PCH_PIC) += irq-loongson-pch-pic.o
obj-$(CONFIG_LOONGSON_PCH_MSI) += irq-loongson-pch-msi.o
obj-$(CONFIG_MST_IRQ) += irq-mst-intc.o
obj-$(CONFIG_SL28CPLD_INTC) += irq-sl28cpld.o
+obj-$(CONFIG_MACH_REALTEK_RTL) += irq-realtek-rtl.o
diff --git a/drivers/irqchip/irq-realtek-rtl.c b/drivers/irqchip/irq-realtek-rtl.c
new file mode 100644
index 000000000000..bafe9ee4a85a
--- /dev/null
+++ b/drivers/irqchip/irq-realtek-rtl.c
@@ -0,0 +1,180 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2006-2012 Tony Wu <tonywu@...ltek.com>
+ * Copyright (C) 2020 Birger Koblitz <mail@...ger-koblitz.de>
+ * Copyright (C) 2020 Bert Vermeulen <bert@...t.com>
+ * Copyright (C) 2020 John Crispin <john@...ozen.org>
+ */
+
+#include <linux/of_irq.h>
+#include <linux/irqchip.h>
+#include <linux/spinlock.h>
+#include <linux/of_address.h>
+#include <linux/irqchip/chained_irq.h>
+
+/* Global Interrupt Mask Register */
+#define RTL_ICTL_GIMR 0x00
+/* Global Interrupt Status Register */
+#define RTL_ICTL_GISR 0x04
+/* Interrupt Routing Registers */
+#define RTL_ICTL_IRR0 0x08
+#define RTL_ICTL_IRR1 0x0c
+#define RTL_ICTL_IRR2 0x10
+#define RTL_ICTL_IRR3 0x14
+
+#define REG(x) (realtek_ictl_base + x)
+
+static DEFINE_RAW_SPINLOCK(irq_lock);
+static void __iomem *realtek_ictl_base;
+
+static void realtek_ictl_unmask_irq(struct irq_data *i)
+{
+ unsigned long flags;
+ u32 value;
+
+ raw_spin_lock_irqsave(&irq_lock, flags);
+
+ value = readl(REG(RTL_ICTL_GIMR));
+ value |= BIT(i->hwirq);
+ writel(value, REG(RTL_ICTL_GIMR));
+
+ raw_spin_unlock_irqrestore(&irq_lock, flags);
+}
+
+static void realtek_ictl_mask_irq(struct irq_data *i)
+{
+ unsigned long flags;
+ u32 value;
+
+ raw_spin_lock_irqsave(&irq_lock, flags);
+
+ value = readl(REG(RTL_ICTL_GIMR));
+ value &= ~BIT(i->hwirq);
+ writel(value, REG(RTL_ICTL_GIMR));
+
+ raw_spin_unlock_irqrestore(&irq_lock, flags);
+}
+
+static struct irq_chip realtek_ictl_irq = {
+ .name = "realtek-rtl-intc",
+ .irq_mask = realtek_ictl_mask_irq,
+ .irq_unmask = realtek_ictl_unmask_irq,
+};
+
+static int intc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
+{
+ irq_set_chip_and_handler(hw, &realtek_ictl_irq, handle_level_irq);
+
+ return 0;
+}
+
+static const struct irq_domain_ops irq_domain_ops = {
+ .map = intc_map,
+ .xlate = irq_domain_xlate_onecell,
+};
+
+static void realtek_irq_dispatch(struct irq_desc *desc)
+{
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct irq_domain *domain;
+ unsigned int pending;
+
+ chained_irq_enter(chip, desc);
+ pending = readl(REG(RTL_ICTL_GIMR)) & readl(REG(RTL_ICTL_GISR));
+ if (unlikely(!pending)) {
+ spurious_interrupt();
+ goto out;
+ }
+ domain = irq_desc_get_handler_data(desc);
+ generic_handle_irq(irq_find_mapping(domain, __ffs(pending)));
+
+out:
+ chained_irq_exit(chip, desc);
+}
+
+/*
+ * SoC interrupts are cascaded to MIPS CPU interrupts according to the
+ * interrupt-map in the device tree. Each SoC interrupt gets 4 bits for
+ * the CPU interrupt in an Interrupt Routing Register. Max 32 SoC interrupts
+ * thus go into 4 IRRs.
+ */
+static int __init map_interrupts(struct device_node *node)
+{
+ struct device_node *cpu_ictl;
+ const __be32 *imap;
+ u32 imaplen, soc_int, cpu_int, tmp, regs[4];
+ int ret, i, irr_regs[] = {
+ RTL_ICTL_IRR3,
+ RTL_ICTL_IRR2,
+ RTL_ICTL_IRR1,
+ RTL_ICTL_IRR0,
+ };
+
+ ret = of_property_read_u32(node, "#address-cells", &tmp);
+ if (ret || tmp)
+ return -EINVAL;
+
+ imap = of_get_property(node, "interrupt-map", &imaplen);
+ if (!imap || imaplen % 3)
+ return -EINVAL;
+
+ memset(regs, 0, sizeof(regs));
+ for (i = 0; i < imaplen; i += 3 * sizeof(u32)) {
+ soc_int = be32_to_cpup(imap);
+ if (soc_int > 31)
+ return -EINVAL;
+
+ cpu_ictl = of_find_node_by_phandle(be32_to_cpup(imap + 1));
+ if (!cpu_ictl)
+ return -EINVAL;
+ ret = of_property_read_u32(cpu_ictl, "#interrupt-cells", &tmp);
+ if (ret || tmp != 1)
+ return -EINVAL;
+ of_node_put(cpu_ictl);
+
+ cpu_int = be32_to_cpup(imap + 2);
+ if (cpu_int > 7)
+ return -EINVAL;
+
+ regs[(soc_int * 4) / 32] |= cpu_int << (soc_int * 4) % 32;
+ imap += 3;
+ }
+
+ for (i = 0; i < 4; i++)
+ writel(regs[i], REG(irr_regs[i]));
+
+ return 0;
+}
+
+static int __init realtek_rtl_of_init(struct device_node *node, struct device_node *parent)
+{
+ struct irq_domain *domain;
+ int ret;
+
+ domain = irq_domain_add_simple(node, 32, 0,
+ &irq_domain_ops, NULL);
+ irq_set_chained_handler_and_data(2, realtek_irq_dispatch, domain);
+ irq_set_chained_handler_and_data(3, realtek_irq_dispatch, domain);
+ irq_set_chained_handler_and_data(4, realtek_irq_dispatch, domain);
+ irq_set_chained_handler_and_data(5, realtek_irq_dispatch, domain);
+
+ realtek_ictl_base = of_iomap(node, 0);
+ if (!realtek_ictl_base)
+ return -ENXIO;
+
+ /* Disable all cascaded interrupts */
+ writel(0, REG(RTL_ICTL_GIMR));
+
+ ret = map_interrupts(node);
+ if (ret) {
+ pr_err("invalid interrupt map\n");
+ return ret;
+ }
+
+ /* Clear timer interrupt */
+ write_c0_compare(0);
+
+ return 0;
+}
+
+IRQCHIP_DECLARE(realtek_rtl_intc, "realtek,rtl-intc", realtek_rtl_of_init);
--
2.25.1
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