From patchwork Tue Apr 30 08:37:21 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Herve Codina X-Patchwork-Id: 13648641 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 74730C10F16 for ; Tue, 30 Apr 2024 09:45:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=+4M5Q+A6+Hef4cDN4OAUfMYrB1HeukhjcoUwE3ljCd4=; b=Bsc2pYbfIt6DHB /AcZCFs5rxQ70EIVcgoXYvZHKPcFWKzE6w/ZKXbYEelyPF3NFh0Yh9NynCoZDk5zLxyKU/OzfoYK5 cpMe4eIeUhbwlboUUYewj1ePS3zqk0vOcftkdN3idY8vrDkL6jkmvnQmfETs0w1tTM2AyUnkJe85b yaebq10d9uMP0xvTHIzamBuME4mhsCK7Wsu1idKxFi0wymVoHXhBZ8dejIdpLAbA/1De7xR2UkJLI NGkKuiRMO7iJm4ZYMD4rBkQO2nlPeSoNxv3UUrmda5K4XHnvQRXSW9sce551CDdypSH8Zltgmz+HQ EwsXjQ+EHZCXvoOAnP8g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1s1k3R-00000005tM7-0j3L; Tue, 30 Apr 2024 09:45:41 +0000 Received: from relay7-d.mail.gandi.net ([217.70.183.200]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1s1j1O-00000005dTA-2Dvh for linux-arm-kernel@lists.infradead.org; Tue, 30 Apr 2024 08:39:34 +0000 Received: by mail.gandi.net (Postfix) with ESMTPA id 5B7842000E; Tue, 30 Apr 2024 08:39:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1714466368; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8HrxA/+8yLc71qfYdn9ZorS/cSEEyapLB+JeDi6Qlp8=; b=pHhh9Abxqvq2jTen/UgLW19vrJ4MHKM8pxomrQSjpHAxCqoD26axtEdoe3T2Kl9NACch7W s83NOYVZDAQuKLlrIFFdFp4W90n4ScUytC/iKZAcovL9p30B1olFpf2a3bP5NLQb9Lt5ln lMShcJiuTAPFsQfIovkudTpn06uwmMfTbaftdVzqqu75mWVnSsO3J/HcYvGdc9wCVgFtR4 AyRnkFcHDt8MY7KH6uVmsvwvzFn6UnHaII4hCDUBka8EGTa6LZJuS+ZuIy/IBX/jXfIiFL h+Bb7HWOXvlCrP1i4tHSa2/AaVXtUf0KlUpa9ATB9RVD7LJ41TTF/yUada7amA== From: Herve Codina To: Herve Codina , Thomas Gleixner , Rob Herring , Krzysztof Kozlowski , Conor Dooley , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Lee Jones , Arnd Bergmann , Horatiu Vultur , UNGLinuxDriver@microchip.com, Andrew Lunn , Heiner Kallweit , Russell King , Saravana Kannan , Bjorn Helgaas , Philipp Zabel , Lars Povlsen , Steen Hegelund , Daniel Machon , Alexandre Belloni Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Allan Nielsen , Steen Hegelund , Luca Ceresoli , Thomas Petazzoni Subject: [PATCH 12/17] irqchip: Add support for LAN966x OIC Date: Tue, 30 Apr 2024 10:37:21 +0200 Message-ID: <20240430083730.134918-13-herve.codina@bootlin.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240430083730.134918-1-herve.codina@bootlin.com> References: <20240430083730.134918-1-herve.codina@bootlin.com> MIME-Version: 1.0 X-GND-Sasl: herve.codina@bootlin.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240430_013931_403377_148272DC X-CRM114-Status: GOOD ( 29.10 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The Microchip LAN966x outband interrupt controller (OIC) maps the internal interrupt sources of the LAN966x device to an external interrupt. When the LAN966x device is used as a PCI device, the external interrupt is routed to the PCI interrupt. Signed-off-by: Herve Codina --- drivers/irqchip/Kconfig | 12 ++ drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-lan966x-oic.c | 301 ++++++++++++++++++++++++++++++ 3 files changed, 314 insertions(+) create mode 100644 drivers/irqchip/irq-lan966x-oic.c diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 72c07a12f5e1..973eebc8d1d1 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -169,6 +169,18 @@ config IXP4XX_IRQ select IRQ_DOMAIN select SPARSE_IRQ +config LAN966X_OIC + tristate "Microchip LAN966x OIC Support" + select GENERIC_IRQ_CHIP + select IRQ_DOMAIN + help + Enable support for the LAN966x Outbound Interrupt Controller. + This controller is present on the Microchip LAN966x PCI device and + maps the internal interrupts sources to PCIe interrupt. + + To compile this driver as a module, choose M here: the module + will be called irq-lan966x-oic. + config MADERA_IRQ tristate diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index ec4a18380998..762d3078aa3b 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -101,6 +101,7 @@ obj-$(CONFIG_IMX_IRQSTEER) += irq-imx-irqsteer.o obj-$(CONFIG_IMX_INTMUX) += irq-imx-intmux.o obj-$(CONFIG_IMX_MU_MSI) += irq-imx-mu-msi.o obj-$(CONFIG_MADERA_IRQ) += irq-madera.o +obj-$(CONFIG_LAN966X_OIC) += irq-lan966x-oic.o obj-$(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 diff --git a/drivers/irqchip/irq-lan966x-oic.c b/drivers/irqchip/irq-lan966x-oic.c new file mode 100644 index 000000000000..342f0dbf16e3 --- /dev/null +++ b/drivers/irqchip/irq-lan966x-oic.c @@ -0,0 +1,301 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for the Microchip LAN966x outbound interrupt controller + * + * Copyright (c) 2024 Technology Inc. and its subsidiaries. + * + * Authors: + * Horatiu Vultur + * Clément Léger + * Herve Codina + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct lan966x_oic_chip_regs { + int reg_off_ena_set; + int reg_off_ena_clr; + int reg_off_sticky; + int reg_off_ident; + int reg_off_map; +}; + +struct lan966x_oic_data { + struct irq_domain *domain; + void __iomem *regs; + int irq; +}; + +#define LAN966X_OIC_NR_IRQ 86 + +/* Interrupt sticky status */ +#define LAN966X_OIC_INTR_STICKY 0x30 +#define LAN966X_OIC_INTR_STICKY1 0x34 +#define LAN966X_OIC_INTR_STICKY2 0x38 + +/* Interrupt enable */ +#define LAN966X_OIC_INTR_ENA 0x48 +#define LAN966X_OIC_INTR_ENA1 0x4c +#define LAN966X_OIC_INTR_ENA2 0x50 + +/* Atomic clear of interrupt enable */ +#define LAN966X_OIC_INTR_ENA_CLR 0x54 +#define LAN966X_OIC_INTR_ENA_CLR1 0x58 +#define LAN966X_OIC_INTR_ENA_CLR2 0x5c + +/* Atomic set of interrupt */ +#define LAN966X_OIC_INTR_ENA_SET 0x60 +#define LAN966X_OIC_INTR_ENA_SET1 0x64 +#define LAN966X_OIC_INTR_ENA_SET2 0x68 + +/* Mapping of source to destination interrupts (_n = 0..8) */ +#define LAN966X_OIC_DST_INTR_MAP(_n) 0x78 +#define LAN966X_OIC_DST_INTR_MAP1(_n) 0x9c +#define LAN966X_OIC_DST_INTR_MAP2(_n) 0xc0 + +/* Currently active interrupt sources per destination (_n = 0..8) */ +#define LAN966X_OIC_DST_INTR_IDENT(_n) 0xe4 +#define LAN966X_OIC_DST_INTR_IDENT1(_n) 0x108 +#define LAN966X_OIC_DST_INTR_IDENT2(_n) 0x12c + +static unsigned int lan966x_oic_irq_startup(struct irq_data *data) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); + struct irq_chip_type *ct = irq_data_get_chip_type(data); + struct lan966x_oic_chip_regs *chip_regs = gc->private; + u32 map; + + irq_gc_lock(gc); + + /* Map the source interrupt to the destination */ + map = irq_reg_readl(gc, chip_regs->reg_off_map); + map |= data->mask; + irq_reg_writel(gc, map, chip_regs->reg_off_map); + + irq_gc_unlock(gc); + + ct->chip.irq_ack(data); + ct->chip.irq_unmask(data); + + return 0; +} + +static void lan966x_oic_irq_shutdown(struct irq_data *data) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); + struct irq_chip_type *ct = irq_data_get_chip_type(data); + struct lan966x_oic_chip_regs *chip_regs = gc->private; + u32 map; + + ct->chip.irq_mask(data); + + irq_gc_lock(gc); + + /* Unmap the interrupt */ + map = irq_reg_readl(gc, chip_regs->reg_off_map); + map &= ~data->mask; + irq_reg_writel(gc, map, chip_regs->reg_off_map); + + irq_gc_unlock(gc); +} + +static int lan966x_oic_irq_set_type(struct irq_data *data, unsigned int flow_type) +{ + if (flow_type != IRQ_TYPE_LEVEL_HIGH) { + pr_err("lan966x oic doesn't support flow type %d\n", flow_type); + return -EINVAL; + } + + return 0; +} + +static void lan966x_oic_irq_handler_domain(struct irq_domain *d, u32 first_irq) +{ + struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, first_irq); + struct lan966x_oic_chip_regs *chip_regs = gc->private; + unsigned long ident; + unsigned int hwirq; + + ident = irq_reg_readl(gc, chip_regs->reg_off_ident); + if (!ident) + return; + + for_each_set_bit(hwirq, &ident, 32) + generic_handle_domain_irq(d, hwirq + first_irq); +} + +static void lan966x_oic_irq_handler(struct irq_desc *desc) +{ + struct irq_domain *d = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + + chained_irq_enter(chip, desc); + lan966x_oic_irq_handler_domain(d, 0); + lan966x_oic_irq_handler_domain(d, 32); + lan966x_oic_irq_handler_domain(d, 64); + chained_irq_exit(chip, desc); +} + +static struct lan966x_oic_chip_regs lan966x_oic_chip_regs[3] = { + { + .reg_off_ena_set = LAN966X_OIC_INTR_ENA_SET, + .reg_off_ena_clr = LAN966X_OIC_INTR_ENA_CLR, + .reg_off_sticky = LAN966X_OIC_INTR_STICKY, + .reg_off_ident = LAN966X_OIC_DST_INTR_IDENT(0), + .reg_off_map = LAN966X_OIC_DST_INTR_MAP(0), + }, { + .reg_off_ena_set = LAN966X_OIC_INTR_ENA_SET1, + .reg_off_ena_clr = LAN966X_OIC_INTR_ENA_CLR1, + .reg_off_sticky = LAN966X_OIC_INTR_STICKY1, + .reg_off_ident = LAN966X_OIC_DST_INTR_IDENT1(0), + .reg_off_map = LAN966X_OIC_DST_INTR_MAP1(0), + }, { + .reg_off_ena_set = LAN966X_OIC_INTR_ENA_SET2, + .reg_off_ena_clr = LAN966X_OIC_INTR_ENA_CLR2, + .reg_off_sticky = LAN966X_OIC_INTR_STICKY2, + .reg_off_ident = LAN966X_OIC_DST_INTR_IDENT2(0), + .reg_off_map = LAN966X_OIC_DST_INTR_MAP2(0), + } +}; + +static void lan966x_oic_chip_init(struct lan966x_oic_data *lan966x_oic, + struct irq_chip_generic *gc, + struct lan966x_oic_chip_regs *chip_regs) +{ + gc->reg_base = lan966x_oic->regs; + gc->chip_types[0].regs.enable = chip_regs->reg_off_ena_set; + gc->chip_types[0].regs.disable = chip_regs->reg_off_ena_clr; + gc->chip_types[0].regs.ack = chip_regs->reg_off_sticky; + gc->chip_types[0].chip.irq_startup = lan966x_oic_irq_startup; + gc->chip_types[0].chip.irq_shutdown = lan966x_oic_irq_shutdown; + gc->chip_types[0].chip.irq_set_type = lan966x_oic_irq_set_type; + gc->chip_types[0].chip.irq_mask = irq_gc_mask_disable_reg; + gc->chip_types[0].chip.irq_unmask = irq_gc_unmask_enable_reg; + gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit; + gc->private = chip_regs; + + /* Disable all interrupts handled by this chip */ + irq_reg_writel(gc, ~0, chip_regs->reg_off_ena_clr); +} + +static void lan966x_oic_chip_exit(struct irq_chip_generic *gc) +{ + /* Disable and ack all interrupts handled by this chip */ + irq_reg_writel(gc, ~0, gc->chip_types[0].regs.disable); + irq_reg_writel(gc, ~0, gc->chip_types[0].regs.ack); +} + +static int lan966x_oic_probe(struct platform_device *pdev) +{ + struct device_node *node = pdev->dev.of_node; + struct lan966x_oic_data *lan966x_oic; + struct device *dev = &pdev->dev; + struct irq_chip_generic *gc; + int ret; + int i; + + lan966x_oic = devm_kmalloc(dev, sizeof(*lan966x_oic), GFP_KERNEL); + if (!lan966x_oic) + return -ENOMEM; + + lan966x_oic->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(lan966x_oic->regs)) + return dev_err_probe(dev, PTR_ERR(lan966x_oic->regs), + "failed to map resource\n"); + + lan966x_oic->domain = irq_domain_alloc_linear(of_node_to_fwnode(node), + LAN966X_OIC_NR_IRQ, + &irq_generic_chip_ops, NULL); + if (!lan966x_oic->domain) { + dev_err(dev, "failed to create an IRQ domain\n"); + return -EINVAL; + } + + lan966x_oic->irq = platform_get_irq(pdev, 0); + if (lan966x_oic->irq < 0) { + dev_err_probe(dev, lan966x_oic->irq, "failed to get the IRQ\n"); + goto err_domain_free; + } + + ret = irq_alloc_domain_generic_chips(lan966x_oic->domain, 32, 1, "lan966x-oic", + handle_level_irq, 0, 0, 0); + if (ret) { + dev_err_probe(dev, ret, "failed to alloc irq domain gc\n"); + goto err_domain_free; + } + + /* Init chips */ + BUILD_BUG_ON(DIV_ROUND_UP(LAN966X_OIC_NR_IRQ, 32) != ARRAY_SIZE(lan966x_oic_chip_regs)); + for (i = 0; i < ARRAY_SIZE(lan966x_oic_chip_regs); i++) { + gc = irq_get_domain_generic_chip(lan966x_oic->domain, i * 32); + lan966x_oic_chip_init(lan966x_oic, gc, &lan966x_oic_chip_regs[i]); + } + + irq_set_chained_handler_and_data(lan966x_oic->irq, lan966x_oic_irq_handler, + lan966x_oic->domain); + + irq_domain_publish(lan966x_oic->domain); + platform_set_drvdata(pdev, lan966x_oic); + return 0; + +err_domain_free: + irq_domain_free(lan966x_oic->domain); + return ret; +} + +static void lan966x_oic_remove(struct platform_device *pdev) +{ + struct lan966x_oic_data *lan966x_oic = platform_get_drvdata(pdev); + struct irq_chip_generic *gc; + int i; + + for (i = 0; i < ARRAY_SIZE(lan966x_oic_chip_regs); i++) { + gc = irq_get_domain_generic_chip(lan966x_oic->domain, i * 32); + lan966x_oic_chip_exit(gc); + } + + irq_set_chained_handler_and_data(lan966x_oic->irq, NULL, NULL); + + for (i = 0; i < LAN966X_OIC_NR_IRQ; i++) + irq_dispose_mapping(irq_find_mapping(lan966x_oic->domain, i)); + + irq_domain_unpublish(lan966x_oic->domain); + + for (i = 0; i < ARRAY_SIZE(lan966x_oic_chip_regs); i++) { + gc = irq_get_domain_generic_chip(lan966x_oic->domain, i * 32); + irq_remove_generic_chip(gc, ~0, 0, 0); + } + + kfree(lan966x_oic->domain->gc); + irq_domain_free(lan966x_oic->domain); +} + +static const struct of_device_id lan966x_oic_of_match[] = { + { .compatible = "microchip,lan966x-oic" }, + {} /* sentinel */ +}; +MODULE_DEVICE_TABLE(of, lan966x_oic_of_match); + +static struct platform_driver lan966x_oic_driver = { + .probe = lan966x_oic_probe, + .remove_new = lan966x_oic_remove, + .driver = { + .name = "lan966x-oic", + .of_match_table = lan966x_oic_of_match, + }, +}; +module_platform_driver(lan966x_oic_driver); + +MODULE_AUTHOR("Herve Codina "); +MODULE_DESCRIPTION("Microchip LAN966x OIC driver"); +MODULE_LICENSE("GPL");