From patchwork Sun Jun 26 00:43:26 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lad Prabhakar X-Patchwork-Id: 12895546 X-Patchwork-Delegate: geert@linux-m68k.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6FB65C433EF for ; Sun, 26 Jun 2022 00:44:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233614AbiFZAo1 (ORCPT ); Sat, 25 Jun 2022 20:44:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56952 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233753AbiFZAo0 (ORCPT ); Sat, 25 Jun 2022 20:44:26 -0400 Received: from relmlie6.idc.renesas.com (relmlor2.renesas.com [210.160.252.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 6A74413D23; Sat, 25 Jun 2022 17:44:24 -0700 (PDT) X-IronPort-AV: E=Sophos;i="5.92,222,1650898800"; d="scan'208";a="125658112" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie6.idc.renesas.com with ESMTP; 26 Jun 2022 09:44:24 +0900 Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id CBA9A40078B9; Sun, 26 Jun 2022 09:44:19 +0900 (JST) From: Lad Prabhakar To: Thomas Gleixner , Marc Zyngier , Rob Herring , Krzysztof Kozlowski , Sagar Kadam , Palmer Dabbelt , Paul Walmsley , linux-riscv@lists.infradead.org, devicetree@vger.kernel.org Cc: Geert Uytterhoeven , linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Prabhakar , Biju Das , Lad Prabhakar Subject: [PATCH v2 2/2] irqchip/sifive-plic: Add support for Renesas RZ/Five SoC Date: Sun, 26 Jun 2022 01:43:26 +0100 Message-Id: <20220626004326.8548-3-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220626004326.8548-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20220626004326.8548-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org The Renesas RZ/Five SoC has a RISC-V AX45MP AndesCore with NCEPLIC100. The NCEPLIC100 supports both edge-triggered and level-triggered interrupts. In case of edge-triggered interrupts NCEPLIC100 ignores the next interrupt edge until the previous completion message has been received and NCEPLIC100 doesn't support pending interrupt counter, hence losing the interrupts if not acknowledged in time. So the workaround for edge-triggered interrupts to be handled correctly and without losing is that it needs to be acknowledged first and then handler must be run so that we don't miss on the next edge-triggered interrupt. This patch adds a new compatible string for Renesas RZ/Five SoC and adds support to change interrupt flow based on the interrupt type. It also implements irq_ack and irq_set_type callbacks. Signed-off-by: Lad Prabhakar --- v1->v2: * Implemented IRQ flow as suggested by Marc RFC-->v1: * Fixed review comments pointed by Geert * Dropped handle_fasteoi_ack_irq support as for the PLIC we need to claim the interrupt by reading the register and then acknowledge it. * Add a new chained handler for RZ/Five SoC. --- drivers/irqchip/Kconfig | 1 + drivers/irqchip/irq-sifive-plic.c | 73 ++++++++++++++++++++++++++++++- 2 files changed, 72 insertions(+), 2 deletions(-) diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 4ab1038b5482..0245dcabe3e9 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -530,6 +530,7 @@ config SIFIVE_PLIC bool "SiFive Platform-Level Interrupt Controller" depends on RISCV select IRQ_DOMAIN_HIERARCHY + select IRQ_FASTEOI_HIERARCHY_HANDLERS help This enables support for the PLIC chip found in SiFive (and potentially other) RISC-V systems. The PLIC controls devices diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c index bb87e4c3b88e..9fb9f62afb6a 100644 --- a/drivers/irqchip/irq-sifive-plic.c +++ b/drivers/irqchip/irq-sifive-plic.c @@ -60,10 +60,13 @@ #define PLIC_DISABLE_THRESHOLD 0x7 #define PLIC_ENABLE_THRESHOLD 0 +#define RENESAS_R9A07G043_PLIC 1 + struct plic_priv { struct cpumask lmask; struct irq_domain *irqdomain; void __iomem *regs; + u8 of_data; }; struct plic_handler { @@ -81,6 +84,8 @@ static int plic_parent_irq __ro_after_init; static bool plic_cpuhp_setup_done __ro_after_init; static DEFINE_PER_CPU(struct plic_handler, plic_handlers); +static int plic_irq_set_type(struct irq_data *d, unsigned int type); + static void __plic_toggle(void __iomem *enable_base, int hwirq, int enable) { u32 __iomem *reg = enable_base + (hwirq / 32) * sizeof(u32); @@ -176,16 +181,61 @@ static void plic_irq_eoi(struct irq_data *d) } } +static void renesas_rzfive_plic_edge_irq_eoi(struct irq_data *data) +{ + /* We have nothing to do here */ +} + static struct irq_chip plic_chip = { .name = "SiFive PLIC", .irq_mask = plic_irq_mask, .irq_unmask = plic_irq_unmask, .irq_eoi = plic_irq_eoi, + .irq_set_type = plic_irq_set_type, +#ifdef CONFIG_SMP + .irq_set_affinity = plic_set_affinity, +#endif +}; + +static struct irq_chip renesas_rzfive_edge_plic_chip = { + .name = "Renesas RZ/Five PLIC", + .irq_mask = plic_irq_mask, + .irq_unmask = plic_irq_unmask, + .irq_ack = plic_irq_eoi, + .irq_eoi = renesas_rzfive_plic_edge_irq_eoi, + .irq_set_type = plic_irq_set_type, #ifdef CONFIG_SMP .irq_set_affinity = plic_set_affinity, #endif }; +static int plic_irq_set_type(struct irq_data *d, unsigned int type) +{ + struct plic_handler *handler = this_cpu_ptr(&plic_handlers); + + if (handler->priv->of_data != RENESAS_R9A07G043_PLIC) + return 0; + + switch (type) { + case IRQ_TYPE_LEVEL_HIGH: + irq_set_chip_handler_name_locked(d, &renesas_rzfive_edge_plic_chip, + handle_fasteoi_ack_irq, + "Edge"); + break; + + case IRQ_TYPE_EDGE_RISING: + irq_set_chip_handler_name_locked(d, &plic_chip, + handle_fasteoi_irq, + "Level"); + break; + + default: + return -EINVAL; + } + + return 0; +} + static int plic_irqdomain_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hwirq) { @@ -198,6 +248,19 @@ static int plic_irqdomain_map(struct irq_domain *d, unsigned int irq, return 0; } +static int plic_irq_domain_translate(struct irq_domain *d, + struct irq_fwspec *fwspec, + unsigned long *hwirq, + unsigned int *type) +{ + struct plic_priv *priv = d->host_data; + + if (priv->of_data == RENESAS_R9A07G043_PLIC) + return irq_domain_translate_twocell(d, fwspec, hwirq, type); + + return irq_domain_translate_onecell(d, fwspec, hwirq, type); +} + static int plic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs, void *arg) { @@ -206,7 +269,7 @@ static int plic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, unsigned int type; struct irq_fwspec *fwspec = arg; - ret = irq_domain_translate_onecell(domain, fwspec, &hwirq, &type); + ret = plic_irq_domain_translate(domain, fwspec, &hwirq, &type); if (ret) return ret; @@ -220,7 +283,7 @@ static int plic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, } static const struct irq_domain_ops plic_irqdomain_ops = { - .translate = irq_domain_translate_onecell, + .translate = plic_irq_domain_translate, .alloc = plic_irq_domain_alloc, .free = irq_domain_free_irqs_top, }; @@ -293,6 +356,11 @@ static int __init plic_init(struct device_node *node, if (!priv) return -ENOMEM; + if (of_device_is_compatible(node, "renesas,r9a07g043-plic")) { + priv->of_data = RENESAS_R9A07G043_PLIC; + plic_chip.name = "Renesas RZ/Five PLIC"; + } + priv->regs = of_iomap(node, 0); if (WARN_ON(!priv->regs)) { error = -EIO; @@ -411,5 +479,6 @@ static int __init plic_init(struct device_node *node, } IRQCHIP_DECLARE(sifive_plic, "sifive,plic-1.0.0", plic_init); +IRQCHIP_DECLARE(renesas_r9a07g043_plic, "renesas,r9a07g043-plic", plic_init); IRQCHIP_DECLARE(riscv_plic0, "riscv,plic0", plic_init); /* for legacy systems */ IRQCHIP_DECLARE(thead_c900_plic, "thead,c900-plic", plic_init); /* for firmware driver */