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Date: Tue, 27 Aug 2019 13:53:53 +0100
From: Marc Zyngier <maz@...nel.org>
To: Jiaxun Yang <jiaxun.yang@...goat.com>, linux-mips@...r.kernel.org
Cc: chenhc@...ote.com, paul.burton@...s.com, tglx@...utronix.de,
jason@...edaemon.net, linux-kernel@...r.kernel.org,
robh+dt@...nel.org, mark.rutland@....co, devicetree@...r.kernel.org
Subject: Re: [PATCH 06/13] irqchip: Add driver for Loongson-3 HyperTransport
interrupt controller
On 27/08/2019 09:52, Jiaxun Yang wrote:
> This controller appeared on Loongson-3 family of chips to receive interrupts
> from PCH chip.
>
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> ---
> drivers/irqchip/Kconfig | 8 ++
> drivers/irqchip/Makefile | 1 +
> drivers/irqchip/irq-ls3-htintc.c | 145 +++++++++++++++++++++++++++++++
> 3 files changed, 154 insertions(+)
> create mode 100644 drivers/irqchip/irq-ls3-htintc.c
>
> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> index 8d9eac5fd4a7..b3ce0f3e43ae 100644
> --- a/drivers/irqchip/Kconfig
> +++ b/drivers/irqchip/Kconfig
> @@ -480,6 +480,14 @@ config LS3_IOINTC
> help
> Support for the Loongson-3 I/O Interrupt Controller.
>
> +config LS3_HTINTC
> + bool "Loongson3 HyperTransport Interrupt Controller"
> + depends on MACH_LOONGSON64
> + default y
> + select IRQ_DOMAIN
> + select GENERIC_IRQ_CHIP
> + help
> + Support for the Loongson-3 HyperTransport Interrupt Controller.
> endmenu
>
> config SIFIVE_PLIC
> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> index 49ecb8d38138..0fda94c319e9 100644
> --- a/drivers/irqchip/Makefile
> +++ b/drivers/irqchip/Makefile
> @@ -103,3 +103,4 @@ 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_LS3_IOINTC) += irq-ls3-iointc.o
> +obj-$(CONFIG_LS3_HTINTC) += irq-ls3-htintc.o
> diff --git a/drivers/irqchip/irq-ls3-htintc.c b/drivers/irqchip/irq-ls3-htintc.c
> new file mode 100644
> index 000000000000..c53bbb0bd78c
> --- /dev/null
> +++ b/drivers/irqchip/irq-ls3-htintc.c
> @@ -0,0 +1,145 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2019, Jiaxun Yang <jiaxun.yang@...goat.com>
> + * Loongson-3 HyperTransport 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>
> +
> +#define HTINTC_NUM_GC 4
> +#define HTINTC_GC_SIZE 0x4
> +#define HTINTC_NUM_HANDLER 4
> +#define HTINTC_HANDLER_SIZE 0x8
> +#define HTINTC_HANDLER_IRQ 64
> +
> +#define HTINTC_VECTOR_OFFSET 0x0
> +#define HTINTC_EN_OFFSET 0x20
> +
> +struct htintc_handler_priv {
> + struct irq_domain *domain;
> + void __iomem *handler_base;
> +};
> +
> +static void htintc_chained_handle_irq(struct irq_desc *desc)
> +{
> + struct htintc_handler_priv *priv = irq_desc_get_handler_data(desc);
> + struct irq_chip *chip = irq_desc_get_chip(desc);
> + int i;
> + bool handled;
> +
> + chained_irq_enter(chip, desc);
> +
> + for (i = 0; i < HTINTC_NUM_GC; i++) {
> + uint32_t irqs = readl(priv->handler_base + HTINTC_GC_SIZE * i);
> +
> + while (irqs) {
> + int bit = __ffs(irqs);
> +
> + generic_handle_irq(irq_find_mapping(priv->domain, bit + 32 * i));
> + irqs &= ~BIT(bit);
> + handled = true;
> + }
> + }
> +
> + if (!handled)
Uninitialized variable. I'm pretty sure your compiler warns about that.
> + spurious_interrupt();
> +
> + chained_irq_exit(chip, desc);
> +}
> +
> +int __init ls3_htintc_of_init(struct device_node *node,
> + struct device_node *parent)
> +{
> + struct irq_chip_generic *gc;
> + struct irq_chip_type *ct;
> + struct htintc_handler_priv *priv;
> + struct irq_domain *domain;
> + void __iomem *base;
> + int parent_irq[HTINTC_NUM_HANDLER], err = 0;
> + int i;
> +
> +
Spurious empty line.
> + priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + base = of_iomap(node, 0);
> + if (!base) {
> + err = -ENODEV;
> + goto out_free_priv;
> + }
> +
> + for (i = 0; i < HTINTC_NUM_HANDLER; i++) {
> + parent_irq[i] = irq_of_parse_and_map(node, i);
> + if (!parent_irq[i]) {
> + pr_err("ls3-htintc: unable to get parent irq %d\n", i);
> + err = -ENODEV;
> + goto out_iounmap;
> + }
> + }
> + /* Set up an IRQ domain */
> + domain = irq_domain_add_linear(node, 32 * HTINTC_NUM_GC,
> + &irq_generic_chip_ops, NULL);
Please align the second line on the opening bracket from the previous line.
> + if (!domain) {
> + pr_err("ls3-htintc: cannot add IRQ domain\n");
> + err = -ENOMEM;
> + goto out_iounmap;
> + }
> +
> + for (i = 0; i < HTINTC_NUM_HANDLER; i++) {
> + /* Mask all interrupts */
> + writeq(0x0, base + HTINTC_EN_OFFSET + HTINTC_HANDLER_SIZE * i);
> + }
> +
> + err = irq_alloc_domain_generic_chips(domain, 32, 1,
> + node->full_name, handle_fasteoi_irq,
handle_fast_eoi? Where is your irq_eoi callback? That looks wrong given
that you're using a mask/ack/unmask sequence.
> + IRQ_NOPROBE, 0, IRQ_GC_INIT_MASK_CACHE);
> + if (err) {
> + pr_err("ls3-htintc: unable to register IRQ domain\n");
> + err = -ENOMEM;
> + goto out_free_domain;
> + }
> +
> + for (i = 0; i < HTINTC_NUM_GC; i++) {
> + gc = irq_get_domain_generic_chip(domain, i * 32);
> + gc->reg_base = base + HTINTC_GC_SIZE * i;
> + gc->domain = domain;
> +
> + ct = gc->chip_types;
> + ct->regs.mask = HTINTC_EN_OFFSET;
> + ct->regs.ack = HTINTC_VECTOR_OFFSET;
> + 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;
> + }
> +
> + priv->domain = domain;
> + priv->handler_base = base + HTINTC_VECTOR_OFFSET;
> +
> + for (i = 0; i < HTINTC_NUM_HANDLER; i++) {
> + irq_set_chained_handler_and_data(parent_irq[i],
> + htintc_chained_handle_irq, priv);
> + }
> +
> + return 0;
> +
> +out_free_domain:
> + irq_domain_remove(domain);
> +out_iounmap:
> + iounmap(base);
> +out_free_priv:
> + kfree(priv);
> +
> + return err;
> +}
> +
> +IRQCHIP_DECLARE(ls3_htintc, "loongson,ls3-htintc", ls3_htintc_of_init);
>
M.
--
Jazz is not dead, it just smells funny...
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