From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2FF54C41621 for ; Tue, 24 Mar 2020 15:41:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F12E920714 for ; Tue, 24 Mar 2020 15:41:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=flygoat.com header.i=jiaxun.yang@flygoat.com header.b="av8tL+n+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728592AbgCXPlo (ORCPT ); Tue, 24 Mar 2020 11:41:44 -0400 Received: from sender3-op-o12.zoho.com.cn ([124.251.121.243]:17886 "EHLO sender3-op-o12.zoho.com.cn" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727834AbgCXPlo (ORCPT ); Tue, 24 Mar 2020 11:41:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1585064263; s=mail; d=flygoat.com; i=jiaxun.yang@flygoat.com; h=From:To:Cc:Message-ID:Subject:Date:In-Reply-To:References:MIME-Version:Content-Transfer-Encoding:Content-Type; bh=FFdJWM792QbsZJCIqwJbRHQ4We0zlkxh6/kaXjyrm/I=; b=av8tL+n+X+3Q8tFbVZQ4pgzQhL0aH3fCSoNSnwIHD3IV1D1piSJzEK08n/V3Jz8M srHN5H8dUDNTWibudYSAXNzOZW1Mlrfxd+aAzx5G4IJ13NUhth5rza5jr7eFXWxlym8 nKIR5blPMTnJ1CV/MssnkzBmq67h3QFV/bBbp6mY= Received: from localhost.localdomain (39.155.141.144 [39.155.141.144]) by mx.zoho.com.cn with SMTPS id 1585064262172564.3550839800449; Tue, 24 Mar 2020 23:37:42 +0800 (CST) From: Jiaxun Yang To: linux-mips@vger.kernel.org Cc: Jiaxun Yang , Huacai Chen , Thomas Gleixner , Jason Cooper , Marc Zyngier , Rob Herring , Mark Rutland , Thomas Bogendoerfer , Greg Kroah-Hartman , Allison Randal , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Message-ID: <20200324153624.23109-5-jiaxun.yang@flygoat.com> Subject: [PATCH v6 04/11] irqchip: Add driver for Loongson-3 HyperTransport PIC controller Date: Tue, 24 Mar 2020 23:36:01 +0800 X-Mailer: git-send-email 2.26.0.rc2 In-Reply-To: <20200324153624.23109-1-jiaxun.yang@flygoat.com> References: <20200324153624.23109-1-jiaxun.yang@flygoat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoCNMailClient: External Content-Type: text/plain; charset=utf8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This controller appeared on Loongson-3 family of chips to receive interrupt= s 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. Co-developed-by: Huacai Chen Signed-off-by: Jiaxun Yang --- v4-v5: =09Enhancements according to maz's suggestions: =09=09- Add static for private struct =09=09- Drop pointless rename =09=09- Fix DT parse bug =09=09- Clarifications in comments and commit message v5-v6: =09Check parent_irq =3D 0 case. --- arch/mips/include/asm/i8259.h | 1 + drivers/irqchip/Kconfig | 10 ++ drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-loongson-htpic.c | 149 +++++++++++++++++++++++++++ 4 files changed, 161 insertions(+) create mode 100644 drivers/irqchip/irq-loongson-htpic.c diff --git a/arch/mips/include/asm/i8259.h b/arch/mips/include/asm/i8259.h index 97a5e41ed1ab..a54b9649de22 100644 --- 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); =20 extern void init_i8259_irqs(void); +extern struct irq_domain *__init_i8259_irqs(struct device_node *node); =20 /** * i8159_set_poll() - Override the i8259 polling function diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index c609eaa319d2..cae6f480c987 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -522,4 +522,14 @@ config LOONGSON_LIOINTC =09help =09 Support for the Loongson Local I/O Interrupt Controller. =20 +config LOONGSON_HTPIC +=09bool "Loongson3 HyperTransport PIC Controller" +=09depends on MACH_LOONGSON64 +=09default y +=09select IRQ_DOMAIN +=09select GENERIC_IRQ_CHIP +=09select I8259 +=09help +=09 Support for the Loongson-3 HyperTransport PIC Controller. + endmenu diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index 5e7678efdfe6..37bbe39bf909 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -106,3 +106,4 @@ obj-$(CONFIG_LS1X_IRQ)=09=09=09+=3D irq-ls1x.o obj-$(CONFIG_TI_SCI_INTR_IRQCHIP)=09+=3D irq-ti-sci-intr.o obj-$(CONFIG_TI_SCI_INTA_IRQCHIP)=09+=3D irq-ti-sci-inta.o obj-$(CONFIG_LOONGSON_LIOINTC)=09=09+=3D irq-loongson-liointc.o +obj-$(CONFIG_LOONGSON_HTPIC)=09=09+=3D irq-loongson-htpic.o diff --git a/drivers/irqchip/irq-loongson-htpic.c b/drivers/irqchip/irq-loo= ngson-htpic.c new file mode 100644 index 000000000000..dd018c22ea83 --- /dev/null +++ b/drivers/irqchip/irq-loongson-htpic.c @@ -0,0 +1,149 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020, Jiaxun Yang + * Loongson HTPIC IRQ support + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define HTPIC_MAX_PARENT_IRQ=094 +#define HTINT_NUM_VECTORS=098 +#define HTINT_EN_OFF=09=090x20 + +struct loongson_htpic { +=09void __iomem *base; +=09struct irq_domain *domain; +}; + +static struct loongson_htpic *htpic; + +static void htpic_irq_dispatch(struct irq_desc *desc) +{ +=09struct loongson_htpic *priv =3D irq_desc_get_handler_data(desc); +=09struct irq_chip *chip =3D irq_desc_get_chip(desc); +=09uint32_t pending; + +=09chained_irq_enter(chip, desc); +=09pending =3D readl(priv->base); +=09/* Ack all IRQs at once, otherwise IRQ flood might happen */ +=09writel(pending, priv->base); + +=09if (!pending) +=09=09spurious_interrupt(); + +=09while (pending) { +=09=09int bit =3D __ffs(pending); + +=09=09if (unlikely(bit > 15)) { +=09=09=09spurious_interrupt(); +=09=09=09break; +=09=09} + +=09=09generic_handle_irq(irq_linear_revmap(priv->domain, bit)); +=09=09pending &=3D ~BIT(bit); +=09} +=09chained_irq_exit(chip, desc); +} + +static void htpic_reg_init(void) +{ +=09int i; + +=09for (i =3D 0; i < HTINT_NUM_VECTORS; i++) { +=09=09uint32_t val; + +=09=09/* Disable all HT Vectors */ +=09=09writel(0x0, htpic->base + HTINT_EN_OFF + i * 0x4); +=09=09val =3D readl(htpic->base + i * 0x4); +=09=09/* Ack all possible pending IRQs */ +=09=09writel(GENMASK(31, 0), htpic->base + i * 0x4); +=09} + +=09/* Enable 16 vectors for PIC */ +=09writel(0xffff, htpic->base + HTINT_EN_OFF); +} + +static void htpic_resume(void) +{ +=09htpic_reg_init(); +} + +struct syscore_ops htpic_syscore_ops =3D { +=09.resume=09=09=3D htpic_resume, +}; + +int __init htpic_of_init(struct device_node *node, struct device_node *par= ent) +{ +=09unsigned int parent_irq[4]; +=09int i, err; +=09int num_parents =3D 0; + +=09if (htpic) { +=09=09pr_err("loongson-htpic: Only one HTPIC is allowed in the system\n"); +=09=09return -ENODEV; +=09} + +=09htpic =3D kzalloc(sizeof(*htpic), GFP_KERNEL); +=09if (!htpic) { +=09=09err =3D -ENOMEM; +=09=09goto out_free; +=09} + +=09htpic->base =3D of_iomap(node, 0); +=09if (!htpic->base) { +=09=09err =3D -ENODEV; +=09=09goto out_free; +=09} + +=09htpic->domain =3D __init_i8259_irqs(node); +=09if (!htpic->domain) { +=09=09pr_err("loongson-htpic: Failed to initialize i8259 IRQs\n"); +=09=09err =3D -ENOMEM; +=09=09goto out_iounmap; +=09} + +=09/* Interrupt may come from any of the 4 interrupt line */ +=09for (i =3D 0; i < HTPIC_MAX_PARENT_IRQ; i++) { +=09=09parent_irq[i] =3D irq_of_parse_and_map(node, i); +=09=09if (parent_irq[i] <=3D 0) +=09=09=09break; + +=09=09num_parents++; +=09} + +=09if (!num_parents) { +=09=09pr_err("loongson-htpic: Failed to get parent irqs\n"); +=09=09err =3D -ENODEV; +=09=09goto out_remove_domain; +=09} + +=09htpic_reg_init(); + +=09for (i =3D 0; i < num_parents; i++) { +=09=09irq_set_chained_handler_and_data(parent_irq[i], +=09=09=09=09=09=09htpic_irq_dispatch, htpic); +=09} + +=09register_syscore_ops(&htpic_syscore_ops); + +=09return 0; + +out_remove_domain: +=09irq_domain_remove(htpic->domain); +out_iounmap: +=09iounmap(htpic->base); +out_free: +=09kfree(htpic); +=09return err; +} + +IRQCHIP_DECLARE(loongson_htpic, "loongson,htpic-1.0", htpic_of_init); --=20 2.26.0.rc2