From patchwork Thu May 28 15:27:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiaxun Yang X-Patchwork-Id: 199830 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=-9.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 866F9C433DF for ; Thu, 28 May 2020 15:29:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 57F7B20897 for ; Thu, 28 May 2020 15:29:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=flygoat.com header.i=@flygoat.com header.b="TnaNU5x1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404429AbgE1P3H (ORCPT ); Thu, 28 May 2020 11:29:07 -0400 Received: from vultr.net.flygoat.com ([149.28.68.211]:34604 "EHLO vultr.net.flygoat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404409AbgE1P24 (ORCPT ); Thu, 28 May 2020 11:28:56 -0400 Received: from localhost.localdomain (unknown [IPv6:2001:da8:20f:4430:250:56ff:fe9a:7470]) by vultr.net.flygoat.com (Postfix) with ESMTPSA id 361B720F0F; Thu, 28 May 2020 15:28:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=flygoat.com; s=vultr; t=1590679735; bh=YBUn3Oz5CnhmVZaWN0CnLBfCQOSFI6MPNke/jZ3j1CA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TnaNU5x1lqfcxt30YPR4CMMJVMlOnl3N1huHXoySWc52hzIRYsyjHSaeyrxBduWyA 6Lxf5k1nLhCR+pJlHLFRUw0iz9ky94XBKJCBF4Tusb2EuEDo6GxX9qCiBNs5MElt+T n2zSWsF4wi8D8mlPHN0hDUcP33XLCIlS+/ztebYATIoNmq3HU88iIXvzpDoCzQqRh7 n41XTSRmg4kBChTAOBMmW4KZcB7IWh2sNiFQ6QHkJVxObd3bDKl58+pvLiZAzCea1p uGexTNDvv0hsvMW8nKi/BgkRVRiquS8vW0Ma1h8EsxHBpdZcUctNJnj814TWd4glD4 VQnvSKF0ymhoQ== From: Jiaxun Yang To: maz@kernel.org Cc: Jiaxun Yang , Thomas Gleixner , Jason Cooper , Rob Herring , Huacai Chen , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-mips@vger.kernel.org Subject: [PATCH v5 3/6] irqchip: Add Loongson PCH PIC controller Date: Thu, 28 May 2020 23:27:51 +0800 Message-Id: <20200528152757.1028711-4-jiaxun.yang@flygoat.com> X-Mailer: git-send-email 2.27.0.rc0 In-Reply-To: <20200528152757.1028711-1-jiaxun.yang@flygoat.com> References: <20200528152757.1028711-1-jiaxun.yang@flygoat.com> MIME-Version: 1.0 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org This controller appears on Loongson LS7A family of PCH to transform interrupts from devices into HyperTransport vectorized interrrupts and send them to procrssor's HT vector controller. Signed-off-by: Jiaxun Yang --- v2: - Style clean-ups - Use IRQ_FASTEOI_HIERARCHY_HANDLERS - Move lock into bitclr & bitset - Make loongson,pic-base-vec as required property v4: - Fix variable declear ordering - Remove irqsave for spin-locks --- drivers/irqchip/Kconfig | 9 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-loongson-pch-pic.c | 243 +++++++++++++++++++++++++ 3 files changed, 253 insertions(+) create mode 100644 drivers/irqchip/irq-loongson-pch-pic.c diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index de4564e2ea88..5524a621638c 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -540,4 +540,13 @@ config LOONGSON_HTVEC help Support for the Loongson3 HyperTransport Interrupt Vector Controller. +config LOONGSON_PCH_PIC + bool "Loongson PCH PIC Controller" + depends on MACH_LOONGSON64 || COMPILE_TEST + default MACH_LOONGSON64 + select IRQ_DOMAIN_HIERARCHY + select IRQ_FASTEOI_HIERARCHY_HANDLERS + help + Support for the Loongson PCH PIC Controller. + endmenu diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index 74561879f5a7..acc72331cec8 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -108,3 +108,4 @@ obj-$(CONFIG_TI_SCI_INTA_IRQCHIP) += irq-ti-sci-inta.o obj-$(CONFIG_LOONGSON_LIOINTC) += irq-loongson-liointc.o obj-$(CONFIG_LOONGSON_HTPIC) += irq-loongson-htpic.o obj-$(CONFIG_LOONGSON_HTVEC) += irq-loongson-htvec.o +obj-$(CONFIG_LOONGSON_PCH_PIC) += irq-loongson-pch-pic.o diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c new file mode 100644 index 000000000000..2a05b9305012 --- /dev/null +++ b/drivers/irqchip/irq-loongson-pch-pic.c @@ -0,0 +1,243 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020, Jiaxun Yang + * Loongson PCH PIC support + */ + +#define pr_fmt(fmt) "pch-pic: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Registers */ +#define PCH_PIC_MASK 0x20 +#define PCH_PIC_HTMSI_EN 0x40 +#define PCH_PIC_EDGE 0x60 +#define PCH_PIC_CLR 0x80 +#define PCH_PIC_AUTO0 0xc0 +#define PCH_PIC_AUTO1 0xe0 +#define PCH_INT_ROUTE(irq) (0x100 + irq) +#define PCH_INT_HTVEC(irq) (0x200 + irq) +#define PCH_PIC_POL 0x3e0 + +#define PIC_COUNT_PER_REG 32 +#define PIC_REG_COUNT 2 +#define PIC_COUNT (PIC_COUNT_PER_REG * PIC_REG_COUNT) +#define PIC_REG_IDX(irq_id) ((irq_id) / PIC_COUNT_PER_REG) +#define PIC_REG_BIT(irq_id) ((irq_id) % PIC_COUNT_PER_REG) + +struct pch_pic { + void __iomem *base; + struct irq_domain *pic_domain; + u32 ht_vec_base; + raw_spinlock_t pic_lock; +}; + +static void pch_pic_bitset(struct pch_pic *priv, int offset, int bit) +{ + u32 reg; + void __iomem *addr = priv->base + offset + PIC_REG_IDX(bit) * 4; + + raw_spin_lock(&priv->pic_lock); + reg = readl(addr); + reg |= BIT(PIC_REG_BIT(bit)); + writel(reg, addr); + raw_spin_unlock(&priv->pic_lock); +} + +static void pch_pic_bitclr(struct pch_pic *priv, int offset, int bit) +{ + u32 reg; + void __iomem *addr = priv->base + offset + PIC_REG_IDX(bit) * 4; + + raw_spin_lock(&priv->pic_lock); + reg = readl(addr); + reg &= ~BIT(PIC_REG_BIT(bit)); + writel(reg, addr); + raw_spin_unlock(&priv->pic_lock); +} + +static void pch_pic_eoi_irq(struct irq_data *d) +{ + u32 idx = PIC_REG_IDX(d->hwirq); + struct pch_pic *priv = irq_data_get_irq_chip_data(d); + + writel(BIT(PIC_REG_BIT(d->hwirq)), + priv->base + PCH_PIC_CLR + idx * 4); +} + +static void pch_pic_mask_irq(struct irq_data *d) +{ + struct pch_pic *priv = irq_data_get_irq_chip_data(d); + + pch_pic_bitset(priv, PCH_PIC_MASK, d->hwirq); + irq_chip_mask_parent(d); +} + +static void pch_pic_unmask_irq(struct irq_data *d) +{ + struct pch_pic *priv = irq_data_get_irq_chip_data(d); + + irq_chip_unmask_parent(d); + pch_pic_bitclr(priv, PCH_PIC_MASK, d->hwirq); +} + +static int pch_pic_set_type(struct irq_data *d, unsigned int type) +{ + struct pch_pic *priv = irq_data_get_irq_chip_data(d); + int ret = 0; + + switch (type) { + case IRQ_TYPE_EDGE_RISING: + pch_pic_bitset(priv, PCH_PIC_EDGE, d->hwirq); + pch_pic_bitclr(priv, PCH_PIC_POL, d->hwirq); + break; + case IRQ_TYPE_EDGE_FALLING: + pch_pic_bitset(priv, PCH_PIC_EDGE, d->hwirq); + pch_pic_bitset(priv, PCH_PIC_POL, d->hwirq); + break; + case IRQ_TYPE_LEVEL_HIGH: + pch_pic_bitclr(priv, PCH_PIC_EDGE, d->hwirq); + pch_pic_bitclr(priv, PCH_PIC_POL, d->hwirq); + break; + case IRQ_TYPE_LEVEL_LOW: + pch_pic_bitclr(priv, PCH_PIC_EDGE, d->hwirq); + pch_pic_bitset(priv, PCH_PIC_POL, d->hwirq); + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} + +static struct irq_chip pch_pic_irq_chip = { + .name = "PCH PIC", + .irq_mask = pch_pic_mask_irq, + .irq_unmask = pch_pic_unmask_irq, + .irq_ack = irq_chip_ack_parent, + .irq_eoi = pch_pic_eoi_irq, + .irq_set_affinity = irq_chip_set_affinity_parent, + .irq_set_type = pch_pic_set_type, +}; + +static int pch_pic_alloc(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs, void *arg) +{ + int err; + unsigned int type; + unsigned long hwirq; + struct irq_fwspec fwspec; + struct pch_pic *priv = domain->host_data; + + irq_domain_translate_twocell(domain, arg, &hwirq, &type); + + fwspec.fwnode = domain->parent->fwnode; + fwspec.param_count = 1; + fwspec.param[0] = hwirq + priv->ht_vec_base; + + err = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec); + if (err) + return err; + + irq_domain_set_info(domain, virq, hwirq, + &pch_pic_irq_chip, priv, + handle_fasteoi_ack_irq, NULL, NULL); + irq_set_probe(virq); + + return 0; +} + +static const struct irq_domain_ops pch_pic_domain_ops = { + .translate = irq_domain_translate_twocell, + .alloc = pch_pic_alloc, + .free = irq_domain_free_irqs_parent, +}; + +static void pch_pic_reset(struct pch_pic *priv) +{ + int i; + + for (i = 0; i < PIC_COUNT; i++) { + /* Write vectore ID */ + writeb(priv->ht_vec_base + i, priv->base + PCH_INT_HTVEC(i)); + /* Hardcode route to HT0 Lo */ + writeb(1, priv->base + PCH_INT_ROUTE(i)); + } + + for (i = 0; i < PIC_REG_COUNT; i++) { + /* Clear IRQ cause registers, mask all interrupts */ + writel_relaxed(0xFFFFFFFF, priv->base + PCH_PIC_MASK + 4 * i); + writel_relaxed(0xFFFFFFFF, priv->base + PCH_PIC_CLR + 4 * i); + /* Clear auto bounce, we don't need that */ + writel_relaxed(0, priv->base + PCH_PIC_AUTO0 + 4 * i); + writel_relaxed(0, priv->base + PCH_PIC_AUTO1 + 4 * i); + /* Enable HTMSI transformer */ + writel_relaxed(0xFFFFFFFF, priv->base + PCH_PIC_HTMSI_EN + 4 * i); + } +} + +static int pch_pic_of_init(struct device_node *node, + struct device_node *parent) +{ + struct pch_pic *priv; + struct irq_domain *parent_domain; + int err; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + raw_spin_lock_init(&priv->pic_lock); + priv->base = of_iomap(node, 0); + if (!priv->base) { + err = -ENOMEM; + goto free_priv; + } + + parent_domain = irq_find_host(parent); + if (!parent_domain) { + pr_err("Failed to find the parent domain\n"); + err = -ENXIO; + goto iounmap_base; + } + + if (of_property_read_u32(node, "loongson,pic-base-vec", + &priv->ht_vec_base)) { + pr_err("Failed to determine pic-base-vec\n"); + err = -EINVAL; + goto iounmap_base; + } + + priv->pic_domain = irq_domain_create_hierarchy(parent_domain, 0, + PIC_COUNT, + of_node_to_fwnode(node), + &pch_pic_domain_ops, + priv); + if (!priv->pic_domain) { + pr_err("Failed to create IRQ domain\n"); + err = -ENOMEM; + goto iounmap_base; + } + + pch_pic_reset(priv); + + return 0; + +iounmap_base: + iounmap(priv->base); +free_priv: + kfree(priv); + + return err; +} + +IRQCHIP_DECLARE(pch_pic, "loongson,pch-pic-1.0", pch_pic_of_init);