From patchwork Fri Feb 21 05:09:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiaxun Yang X-Patchwork-Id: 11395553 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0E1D813A4 for ; Fri, 21 Feb 2020 05:13:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D7CE5208E4 for ; Fri, 21 Feb 2020 05:13:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=flygoat.com header.i=jiaxun.yang@flygoat.com header.b="auroObkm" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727063AbgBUFNW (ORCPT ); Fri, 21 Feb 2020 00:13:22 -0500 Received: from sender3-op-o12.zoho.com.cn ([124.251.121.243]:17832 "EHLO sender3-op-o12.zoho.com.cn" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725973AbgBUFNW (ORCPT ); Fri, 21 Feb 2020 00:13:22 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1582261931; 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=EBWm/tMneuL7YHunhnDCnqJvS/rXpjtc+NEBJwAzKzE=; b=auroObkm+Y+GM3+xRUGT89XD/9Ib4zkzkz01QKXkIG5KAcHZjEzqwni7spbLBkdP TWLhaV6wAA2SZj2pQcM28/JI6ZkYl1VS/Yky+ZAA2cYS5zpU9AXtROJIZ46UMMmLdVA TSurKjlF8OOnk9UF0VfzhQeTTJ+tTnZ5XzvJWymM= Received: from localhost.localdomain (39.155.141.144 [39.155.141.144]) by mx.zoho.com.cn with SMTPS id 1582261930738746.8940485419176; Fri, 21 Feb 2020 13:12:10 +0800 (CST) From: Jiaxun Yang To: linux-mips@vger.kernel.org Cc: Jiaxun Yang , Thomas Gleixner , Jason Cooper , Marc Zyngier , Rob Herring , Mark Rutland , Ralf Baechle , Paul Burton , Huacai Chen , Allison Randal , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Message-ID: <20200221050942.507775-4-jiaxun.yang@flygoat.com> Subject: [PATCH v4 03/10] irqchip: Add driver for Loongson-3 HyperTransport PIC controller Date: Fri, 21 Feb 2020 13:09:18 +0800 X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200221050942.507775-1-jiaxun.yang@flygoat.com> References: <20200221050942.507775-1-jiaxun.yang@flygoat.com> MIME-Version: 1.0 X-ZohoCNMailClient: External Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org This controller appeared on Loongson-3 family of chips to receive interrupts from PCH PIC. Signed-off-by: Jiaxun Yang --- arch/mips/include/asm/i8259.h | 1 + drivers/irqchip/Kconfig | 10 ++ drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-i8259.c | 6 +- drivers/irqchip/irq-loongson-htpic.c | 146 +++++++++++++++++++++++++++ 5 files changed, 161 insertions(+), 3 deletions(-) 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..1ec3dbb1588f 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); extern void init_i8259_irqs(void); +extern struct irq_domain *of_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 c609eaa319d2..cae6f480c987 100644 --- 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 5e7678efdfe6..37bbe39bf909 100644 --- 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-i8259.c b/drivers/irqchip/irq-i8259.c index d000870d9b6b..9d79acce6c0c 100644 --- a/drivers/irqchip/irq-i8259.c +++ b/drivers/irqchip/irq-i8259.c @@ -309,7 +309,7 @@ static const struct irq_domain_ops i8259A_ops = { * driver compatibility reasons interrupts 0 - 15 to be the i8259 * interrupts even if the hardware uses a different interrupt numbering. */ -struct irq_domain * __init __init_i8259_irqs(struct device_node *node) +struct irq_domain * __init of_init_i8259_irqs(struct device_node *node) { struct irq_domain *domain; @@ -330,7 +330,7 @@ struct irq_domain * __init __init_i8259_irqs(struct device_node *node) void __init init_i8259_irqs(void) { - __init_i8259_irqs(NULL); + of_init_i8259_irqs(NULL); } static void i8259_irq_dispatch(struct irq_desc *desc) @@ -351,7 +351,7 @@ int __init i8259_of_init(struct device_node *node, struct device_node *parent) struct irq_domain *domain; unsigned int parent_irq; - domain = __init_i8259_irqs(node); + domain = of_init_i8259_irqs(node); parent_irq = irq_of_parse_and_map(node, 0); if (!parent_irq) { diff --git a/drivers/irqchip/irq-loongson-htpic.c b/drivers/irqchip/irq-loongson-htpic.c new file mode 100644 index 000000000000..a90cf4357285 --- /dev/null +++ b/drivers/irqchip/irq-loongson-htpic.c @@ -0,0 +1,146 @@ +// 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 4 +#define HTINT_NUM_VECTORS 8 +#define HTINT_EN_OFF 0x20 + +struct loongson_htpic { + void __iomem *base; + struct irq_domain *domain; +}; + +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 */ + writel(pending, priv->base); + + if (!pending) + spurious_interrupt(); + + while (pending) { + int bit = __ffs(pending); + + if (unlikely(bit > 15)) + spurious_interrupt(); + + 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 = of_init_i8259_irqs(node); + if (!htpic->domain) { + pr_err("loongson-htpic: Failed to initialize i8259 IRQs\n"); + err = -ENOMEM; + goto out_iounmap; + } + + for (i = 0; i < HTPIC_MAX_PARENT_IRQ; i++) { + parent_irq[i] = irq_of_parse_and_map(node, 0); + 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);