irqchip: Add driver for Loongson-3 HyperTransport PIC controller

This controller appeared on Loongson-3 family of chips to receive
interrupts from PCH PIC.
It is a I8259 with optimized interrupt polling flow. We can poll
interrupt number from HT vector directly but still have to follow
standard I8259 routines to mask, unmask and EOI.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Co-developed-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

diff --git a/arch/mips/include/asm/i8259.h b/arch/mips/include/asm/i8259.h
index 97a5e41..a54b964 100644 (file)
--- a/arch/mips/include/asm/i8259.h
+++ b/arch/mips/include/asm/i8259.h
@@ -36,6 +36,7 @@ extern raw_spinlock_t i8259A_lock;
 extern void make_8259A_irq(unsigned int irq);
 
 extern void init_i8259_irqs(void);
+extern struct irq_domain *__init_i8259_irqs(struct device_node *node);
 
 /**
  * i8159_set_poll() - Override the i8259 polling function

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index c609eaa..cae6f48 100644 (file)
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -522,4 +522,14 @@ config LOONGSON_LIOINTC
        help
          Support for the Loongson Local I/O Interrupt Controller.
 
+config LOONGSON_HTPIC
+       bool "Loongson3 HyperTransport PIC Controller"
+       depends on MACH_LOONGSON64
+       default y
+       select IRQ_DOMAIN
+       select GENERIC_IRQ_CHIP
+       select I8259
+       help
+         Support for the Loongson-3 HyperTransport PIC Controller.
+
 endmenu

diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 5e7678e..37bbe39 100644 (file)
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -106,3 +106,4 @@ obj-$(CONFIG_LS1X_IRQ)                      += irq-ls1x.o
 obj-$(CONFIG_TI_SCI_INTR_IRQCHIP)      += irq-ti-sci-intr.o
 obj-$(CONFIG_TI_SCI_INTA_IRQCHIP)      += irq-ti-sci-inta.o
 obj-$(CONFIG_LOONGSON_LIOINTC)         += irq-loongson-liointc.o
+obj-$(CONFIG_LOONGSON_HTPIC)           += irq-loongson-htpic.o

diff --git a/drivers/irqchip/irq-loongson-htpic.c b/drivers/irqchip/irq-loongson-htpic.c
new file mode 100644 (file)
index 0000000..dd018c2
--- /dev/null
+++ b/drivers/irqchip/irq-loongson-htpic.c
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Copyright (C) 2020, Jiaxun Yang <jiaxun.yang@flygoat.com>
+ *  Loongson HTPIC IRQ support
+ */
+
+#include <linux/init.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/syscore_ops.h>
+
+#include <asm/i8259.h>
+
+#define HTPIC_MAX_PARENT_IRQ   4
+#define HTINT_NUM_VECTORS      8
+#define HTINT_EN_OFF           0x20
+
+struct loongson_htpic {
+       void __iomem *base;
+       struct irq_domain *domain;
+};
+
+static struct loongson_htpic *htpic;
+
+static void htpic_irq_dispatch(struct irq_desc *desc)
+{
+       struct loongson_htpic *priv = irq_desc_get_handler_data(desc);
+       struct irq_chip *chip = irq_desc_get_chip(desc);
+       uint32_t pending;
+
+       chained_irq_enter(chip, desc);
+       pending = readl(priv->base);
+       /* Ack all IRQs at once, otherwise IRQ flood might happen */
+       writel(pending, priv->base);
+
+       if (!pending)
+               spurious_interrupt();
+
+       while (pending) {
+               int bit = __ffs(pending);
+
+               if (unlikely(bit > 15)) {
+                       spurious_interrupt();
+                       break;
+               }
+
+               generic_handle_irq(irq_linear_revmap(priv->domain, bit));
+               pending &= ~BIT(bit);
+       }
+       chained_irq_exit(chip, desc);
+}
+
+static void htpic_reg_init(void)
+{
+       int i;
+
+       for (i = 0; i < HTINT_NUM_VECTORS; i++) {
+               uint32_t val;
+
+               /* Disable all HT Vectors */
+               writel(0x0, htpic->base + HTINT_EN_OFF + i * 0x4);
+               val = readl(htpic->base + i * 0x4);
+               /* Ack all possible pending IRQs */
+               writel(GENMASK(31, 0), htpic->base + i * 0x4);
+       }
+
+       /* Enable 16 vectors for PIC */
+       writel(0xffff, htpic->base + HTINT_EN_OFF);
+}
+
+static void htpic_resume(void)
+{
+       htpic_reg_init();
+}
+
+struct syscore_ops htpic_syscore_ops = {
+       .resume         = htpic_resume,
+};
+
+int __init htpic_of_init(struct device_node *node, struct device_node *parent)
+{
+       unsigned int parent_irq[4];
+       int i, err;
+       int num_parents = 0;
+
+       if (htpic) {
+               pr_err("loongson-htpic: Only one HTPIC is allowed in the system\n");
+               return -ENODEV;
+       }
+
+       htpic = kzalloc(sizeof(*htpic), GFP_KERNEL);
+       if (!htpic) {
+               err = -ENOMEM;
+               goto out_free;
+       }
+
+       htpic->base = of_iomap(node, 0);
+       if (!htpic->base) {
+               err = -ENODEV;
+               goto out_free;
+       }
+
+       htpic->domain = __init_i8259_irqs(node);
+       if (!htpic->domain) {
+               pr_err("loongson-htpic: Failed to initialize i8259 IRQs\n");
+               err = -ENOMEM;
+               goto out_iounmap;
+       }
+
+       /* Interrupt may come from any of the 4 interrupt line */
+       for (i = 0; i < HTPIC_MAX_PARENT_IRQ; i++) {
+               parent_irq[i] = irq_of_parse_and_map(node, i);
+               if (parent_irq[i] <= 0)
+                       break;
+
+               num_parents++;
+       }
+
+       if (!num_parents) {
+               pr_err("loongson-htpic: Failed to get parent irqs\n");
+               err = -ENODEV;
+               goto out_remove_domain;
+       }
+
+       htpic_reg_init();
+
+       for (i = 0; i < num_parents; i++) {
+               irq_set_chained_handler_and_data(parent_irq[i],
+                                               htpic_irq_dispatch, htpic);
+       }
+
+       register_syscore_ops(&htpic_syscore_ops);
+
+       return 0;
+
+out_remove_domain:
+       irq_domain_remove(htpic->domain);
+out_iounmap:
+       iounmap(htpic->base);
+out_free:
+       kfree(htpic);
+       return err;
+}
+
+IRQCHIP_DECLARE(loongson_htpic, "loongson,htpic-1.0", htpic_of_init);