From patchwork Thu Jan 24 03:27:29 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiaxun Yang X-Patchwork-Id: 10778259 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 374E9913 for ; Thu, 24 Jan 2019 03:28:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 28CAE2C5A2 for ; Thu, 24 Jan 2019 03:28:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1CBD92D3E4; Thu, 24 Jan 2019 03:28:13 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.3 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,URIBL_BLACK autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7E0BB2C5A2 for ; Thu, 24 Jan 2019 03:28:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726322AbfAXD2M (ORCPT ); Wed, 23 Jan 2019 22:28:12 -0500 Received: from forward103j.mail.yandex.net ([5.45.198.246]:53496 "EHLO forward103j.mail.yandex.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726309AbfAXD2L (ORCPT ); Wed, 23 Jan 2019 22:28:11 -0500 Received: from mxback1g.mail.yandex.net (mxback1g.mail.yandex.net [IPv6:2a02:6b8:0:1472:2741:0:8b7:162]) by forward103j.mail.yandex.net (Yandex) with ESMTP id A699A6740B90; Thu, 24 Jan 2019 06:28:08 +0300 (MSK) Received: from smtp1p.mail.yandex.net (smtp1p.mail.yandex.net [2a02:6b8:0:1472:2741:0:8b6:6]) by mxback1g.mail.yandex.net (nwsmtp/Yandex) with ESMTP id d8JBh5DIHi-S8f4bIF5; Thu, 24 Jan 2019 06:28:08 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=flygoat.com; s=mail; t=1548300488; bh=G1eFXXyBpJcaGxH6GWBU8KJBU/mDQdjlYfC8wmJhkkk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=Wg5+XKZX/KF7chDUqJcfY+n9nKfgwTwuB7JfK7j1zkjg645p+fxrsL7VvLA/jQyGS 8QWTzSyRLNm/k0AB4AywikSCVtdKVkqIwl9qn7ulQ2J/y5ZW01EWJBR0oPam0dDm3F j05feaplAKTsyU4lqcNySZhA/QYkX/1wBHOFkfvk= Authentication-Results: mxback1g.mail.yandex.net; dkim=pass header.i=@flygoat.com Received: by smtp1p.mail.yandex.net (nwsmtp/Yandex) with ESMTPSA id 2lgYSlYsqG-RxXeSIL1; Thu, 24 Jan 2019 06:28:05 +0300 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client certificate not present) From: Jiaxun Yang To: linux-mips@vger.kernel.org Cc: tglx@linutronix.de, jason@lakedaemon.net, marc.zyngier@arm.com, robh+dt@kernel.org, mark.rutland@arm.com, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Jiaxun Yang Subject: [PATCH v3 1/2] irqchip: Add driver for Loongson-1 interrupt controller Date: Thu, 24 Jan 2019 11:27:29 +0800 Message-Id: <20190124032730.18237-2-jiaxun.yang@flygoat.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190124032730.18237-1-jiaxun.yang@flygoat.com> References: <20190122154557.22689-1-jiaxun.yang@flygoat.com> <20190124032730.18237-1-jiaxun.yang@flygoat.com> MIME-Version: 1.0 Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This controller appeared on Loongson-1 family MCUs including Loongson-1B and Loongson-1C. Signed-off-by: Jiaxun Yang --- drivers/irqchip/Kconfig | 9 ++ drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-ls1x.c | 176 +++++++++++++++++++++++++++++++++++++ 3 files changed, 186 insertions(+) create mode 100644 drivers/irqchip/irq-ls1x.c diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 3d1e60779078..5dcb5456cd14 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -406,6 +406,15 @@ config IMX_IRQSTEER help Support for the i.MX IRQSTEER interrupt multiplexer/remapper. +config LS1X_IRQ + bool "Loongson-1 Interrupt Controller" + depends on MACH_LOONGSON32 + default y + select IRQ_DOMAIN + select GENERIC_IRQ_CHIP + help + Support for the Loongson-1 platform Interrupt Controller. + endmenu config SIFIVE_PLIC diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index c93713d24b86..7acd0e36d0b4 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -94,3 +94,4 @@ obj-$(CONFIG_CSKY_APB_INTC) += irq-csky-apb-intc.o obj-$(CONFIG_SIFIVE_PLIC) += irq-sifive-plic.o obj-$(CONFIG_IMX_IRQSTEER) += irq-imx-irqsteer.o obj-$(CONFIG_MADERA_IRQ) += irq-madera.o +obj-$(CONFIG_LS1X_IRQ) += irq-ls1x.o diff --git a/drivers/irqchip/irq-ls1x.c b/drivers/irqchip/irq-ls1x.c new file mode 100644 index 000000000000..de92ca04cf9f --- /dev/null +++ b/drivers/irqchip/irq-ls1x.c @@ -0,0 +1,176 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019, Jiaxun Yang + * Loongson-1 platform IRQ support + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + + +#define MAX_CHIPS 5 +#define LS_REG_INTC_STATUS 0x00 +#define LS_REG_INTC_EN 0x04 +#define LS_REG_INTC_SET 0x08 +#define LS_REG_INTC_CLR 0x0c +#define LS_REG_INTC_POL 0x10 +#define LS_REG_INTC_EDGE 0x14 +#define CHIP_SIZE 0x18 + +static void ls_chained_handle_irq(struct irq_desc *desc) +{ + struct irq_chip_generic *gc = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + u32 pending; + + chained_irq_enter(chip, desc); + pending = readl(gc->reg_base + LS_REG_INTC_STATUS) & + readl(gc->reg_base + LS_REG_INTC_EN); + + if (!pending) { + spurious_interrupt(); + chained_irq_exit(chip, desc); + return; + } + + while (pending) { + int bit = __ffs(pending); + + generic_handle_irq(gc->irq_base + bit); + pending &= ~BIT(bit); + } + + chained_irq_exit(chip, desc); +} + +static void ls_intc_set_bit(struct irq_chip_generic *gc, + unsigned int offset, + u32 mask, bool set) +{ + if (set) + writel(readl(gc->reg_base + offset) | mask, + gc->reg_base + offset); + else + writel(readl(gc->reg_base + offset) & ~mask, + gc->reg_base + offset); +} + +static int ls_intc_set_type(struct irq_data *data, unsigned int type) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); + u32 mask = data->mask; + + switch (type) { + case IRQ_TYPE_LEVEL_HIGH: + ls_intc_set_bit(gc, LS_REG_INTC_EDGE, mask, false); + ls_intc_set_bit(gc, LS_REG_INTC_POL, mask, true); + break; + case IRQ_TYPE_LEVEL_LOW: + ls_intc_set_bit(gc, LS_REG_INTC_EDGE, mask, false); + ls_intc_set_bit(gc, LS_REG_INTC_POL, mask, false); + break; + case IRQ_TYPE_EDGE_RISING: + ls_intc_set_bit(gc, LS_REG_INTC_EDGE, mask, true); + ls_intc_set_bit(gc, LS_REG_INTC_POL, mask, true); + break; + case IRQ_TYPE_EDGE_FALLING: + ls_intc_set_bit(gc, LS_REG_INTC_EDGE, mask, true); + ls_intc_set_bit(gc, LS_REG_INTC_POL, mask, false); + break; + case IRQ_TYPE_NONE: + break; + default: + return -EINVAL; + } + + return 0; +} + + +static int __init ls_intc_of_init(struct device_node *node, + struct device_node *parent) +{ + struct irq_chip_generic *gc[MAX_CHIPS]; + struct irq_chip_type *ct; + struct irq_domain *domain; + void __iomem *base; + int parent_irq[MAX_CHIPS], err = 0; + unsigned int i = 0; + + unsigned int num_chips = of_irq_count(node); + + base = of_iomap(node, 0); + if (!base) + return -ENODEV; + + for (i = 0; i < num_chips; i++) { + /* Mask all irqs */ + writel(0x0, base + (i * CHIP_SIZE) + + LS_REG_INTC_EN); + + /* Set all irqs to high level triggered */ + writel(0xffffffff, base + (i * CHIP_SIZE) + + LS_REG_INTC_POL); + + parent_irq[i] = irq_of_parse_and_map(node, i); + + if (!parent_irq[i]) { + pr_warn("unable to get parent irq for irqchip %u\n", i); + goto out_err; + } + + gc[i] = irq_alloc_generic_chip("INTC", 1, + LS1X_IRQ_BASE + (i * 32), + base + (i * CHIP_SIZE), + handle_level_irq); + + ct = gc[i]->chip_types; + ct->regs.mask = LS_REG_INTC_EN; + ct->regs.ack = LS_REG_INTC_CLR; + 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; + ct->chip.irq_set_type = ls_intc_set_type; + + irq_setup_generic_chip(gc[i], IRQ_MSK(32), 0, 0, + IRQ_NOPROBE | IRQ_LEVEL); + } + + domain = irq_domain_add_legacy(node, num_chips * 32, LS1X_IRQ_BASE, 0, + &irq_domain_simple_ops, NULL); + if (!domain) { + pr_warn("unable to register IRQ domain\n"); + err = -EINVAL; + goto out_err; + } + + for (i = 0; i < num_chips; i++) + irq_set_chained_handler_and_data(parent_irq[i], + ls_chained_handle_irq, gc[i]); + + pr_info("ls1x-irq: %u chips registered\n", num_chips); + + return 0; + +out_err: + for (i = 0; i < MAX_CHIPS; i++) { + if (gc[i]) + irq_destroy_generic_chip(gc[i], IRQ_MSK(32), + IRQ_NOPROBE | IRQ_LEVEL, 0); + if (parent_irq[i]) + irq_dispose_mapping(parent_irq[i]); + } + return err; +} + +IRQCHIP_DECLARE(ls1x_intc, "loongson,ls1x-intc", ls_intc_of_init);