From patchwork Fri Apr 29 12:38:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Geis X-Patchwork-Id: 568384 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 95D63C4332F for ; Fri, 29 Apr 2022 12:38:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1359348AbiD2MmE (ORCPT ); Fri, 29 Apr 2022 08:42:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52272 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1359314AbiD2MmC (ORCPT ); Fri, 29 Apr 2022 08:42:02 -0400 Received: from mail-qt1-x82d.google.com (mail-qt1-x82d.google.com [IPv6:2607:f8b0:4864:20::82d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 11B3FC9B50; Fri, 29 Apr 2022 05:38:43 -0700 (PDT) Received: by mail-qt1-x82d.google.com with SMTP id f14so5555461qtq.1; Fri, 29 Apr 2022 05:38:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Uyq1i2Lv45qND56ozQ1y5y+nAN5qNeoyHNd4iCmSY9Q=; b=a6T1aHav6KL+N7p+22s3IuPT5LE1w3optua0IqYhm7t2kvBuFrYEgst8eqnyt5TWHr Be6QDxXiIXnXFAHayNvMITcgShi/ByKV1ZZlsMMe2gLFv5ZJYiIvZZ9/fLX+EuGVP1WY 7klJjRFUahKIk+PsN20ET2GmxGrtvCSnyGAznEQRXe3sUQ9HZElrxMD/XNx9gqlDMMMz kLGS3lnBkh6uFg6ve9unSWLOXOqhtfNvIYp7djFX30+A3FMibCkpWw5oB9IcNfRdKKR+ yHc4OlNjT/D8+BkC6e3v3yKxLwW8pLezH3YBe3CsyTMPu7dAlCOsXbn+SJiy2Mf8rGV9 XQHw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Uyq1i2Lv45qND56ozQ1y5y+nAN5qNeoyHNd4iCmSY9Q=; b=NooUw4UvPMcJnqdK4VJXKMJqogVAhVeK6hEFLOineIK0yCGzcRbWWUZlowTRNCTn2w Dwv0WuSvcXt3nWla23wAkfZulPdXka0fppzof9bC5NC3Dr/nkUk2WwwreYyTAqgC0ztm va4Cbh6AVujyxdz6YB/o+uYOuF1+I1Cnu0QBIy70s11qa+UXPxMcU3yOMu3+TTnwsnn/ LRm6JO0sNZBfmfpq/1+sGVLQ5Fdaok75MpgORRVFO4pE/01AuHORVmwHX4swa73JlSMw YNYppLZNkGEQwTAKlrfetXnphSPkR1S2d6udwLd1gh2Tpjxi0inKcfHxegBf3zaf/RyU TA0w== X-Gm-Message-State: AOAM533hiZzs7Y/Vr32wfHSCtDk44+KLSOdEeUW1N7viMBGoZk2RMusC aMbyVTNpl6BOGHOWbMd6Cbk= X-Google-Smtp-Source: ABdhPJzDkJgvQVaAO6dhxr1s7kOmbkUNFZ1A52IXb9BTaBOf3HQt4KptqT3SUNW951XEIT/Y8ba3lw== X-Received: by 2002:a05:622a:34c:b0:2f3:94ee:b208 with SMTP id r12-20020a05622a034c00b002f394eeb208mr1307922qtw.132.1651235921958; Fri, 29 Apr 2022 05:38:41 -0700 (PDT) Received: from master-x64.sparksnet ([2601:153:980:85b1::10]) by smtp.gmail.com with ESMTPSA id v126-20020a37dc84000000b0069f9c375519sm1431644qki.46.2022.04.29.05.38.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Apr 2022 05:38:41 -0700 (PDT) From: Peter Geis To: linux-rockchip@lists.infradead.org, Lorenzo Pieralisi , Rob Herring , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Bjorn Helgaas , Heiko Stuebner Cc: Peter Geis , Marc Zyngier , linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v9 3/5] PCI: rockchip-dwc: Add legacy interrupt support Date: Fri, 29 Apr 2022 08:38:29 -0400 Message-Id: <20220429123832.2376381-4-pgwipeout@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220429123832.2376381-1-pgwipeout@gmail.com> References: <20220429123832.2376381-1-pgwipeout@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The legacy interrupts on the rk356x PCIe controller are handled by a single muxed interrupt. Add IRQ domain support to the pcie-dw-rockchip driver to support the virtual domain. Signed-off-by: Peter Geis --- drivers/pci/controller/dwc/pcie-dw-rockchip.c | 96 ++++++++++++++++++- 1 file changed, 94 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c index faedbd6ebc20..8c5bb9d7cc36 100644 --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c @@ -10,9 +10,12 @@ #include #include +#include +#include #include #include #include +#include #include #include #include @@ -26,6 +29,7 @@ */ #define HIWORD_UPDATE(mask, val) (((mask) << 16) | (val)) #define HIWORD_UPDATE_BIT(val) HIWORD_UPDATE(val, val) +#define HIWORD_DISABLE_BIT(val) HIWORD_UPDATE(val, ~val) #define to_rockchip_pcie(x) dev_get_drvdata((x)->dev) @@ -36,10 +40,12 @@ #define PCIE_LINKUP (PCIE_SMLH_LINKUP | PCIE_RDLH_LINKUP) #define PCIE_L0S_ENTRY 0x11 #define PCIE_CLIENT_GENERAL_CONTROL 0x0 +#define PCIE_CLIENT_INTR_STATUS_LEGACY 0x8 +#define PCIE_CLIENT_INTR_MASK_LEGACY 0x1c #define PCIE_CLIENT_GENERAL_DEBUG 0x104 -#define PCIE_CLIENT_HOT_RESET_CTRL 0x180 +#define PCIE_CLIENT_HOT_RESET_CTRL 0x180 #define PCIE_CLIENT_LTSSM_STATUS 0x300 -#define PCIE_LTSSM_ENABLE_ENHANCE BIT(4) +#define PCIE_LTSSM_ENABLE_ENHANCE BIT(4) #define PCIE_LTSSM_STATUS_MASK GENMASK(5, 0) struct rockchip_pcie { @@ -51,6 +57,7 @@ struct rockchip_pcie { struct reset_control *rst; struct gpio_desc *rst_gpio; struct regulator *vpcie3v3; + struct irq_domain *irq_domain; }; static int rockchip_pcie_readl_apb(struct rockchip_pcie *rockchip, @@ -65,6 +72,78 @@ static void rockchip_pcie_writel_apb(struct rockchip_pcie *rockchip, writel_relaxed(val, rockchip->apb_base + reg); } +static void rockchip_pcie_legacy_int_handler(struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + struct rockchip_pcie *rockchip = irq_desc_get_handler_data(desc); + unsigned long reg, hwirq; + + chained_irq_enter(chip, desc); + + reg = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_INTR_STATUS_LEGACY); + + for_each_set_bit(hwirq, ®, 4) + generic_handle_domain_irq(rockchip->irq_domain, hwirq); + + chained_irq_exit(chip, desc); +} + +static void rockchip_intx_mask(struct irq_data *data) +{ + rockchip_pcie_writel_apb(irq_data_get_irq_chip_data(data), + HIWORD_UPDATE_BIT(BIT(data->hwirq)), + PCIE_CLIENT_INTR_MASK_LEGACY); +}; + +static void rockchip_intx_unmask(struct irq_data *data) +{ + rockchip_pcie_writel_apb(irq_data_get_irq_chip_data(data), + HIWORD_DISABLE_BIT(BIT(data->hwirq)), + PCIE_CLIENT_INTR_MASK_LEGACY); +}; + +static struct irq_chip rockchip_intx_irq_chip = { + .name = "INTx", + .irq_mask = rockchip_intx_mask, + .irq_unmask = rockchip_intx_unmask, + .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND, +}; + +static int rockchip_pcie_intx_map(struct irq_domain *domain, unsigned int irq, + irq_hw_number_t hwirq) +{ + irq_set_chip_and_handler(irq, &rockchip_intx_irq_chip, handle_level_irq); + irq_set_chip_data(irq, domain->host_data); + + return 0; +} + +static const struct irq_domain_ops intx_domain_ops = { + .map = rockchip_pcie_intx_map, +}; + +static int rockchip_pcie_init_irq_domain(struct rockchip_pcie *rockchip) +{ + struct device *dev = rockchip->pci.dev; + struct device_node *intc; + + intc = of_get_child_by_name(dev->of_node, "legacy-interrupt-controller"); + if (!intc) { + dev_err(dev, "missing child interrupt-controller node\n"); + return -EINVAL; + } + + rockchip->irq_domain = irq_domain_add_linear(intc, PCI_NUM_INTX, + &intx_domain_ops, rockchip); + of_node_put(intc); + if (!rockchip->irq_domain) { + dev_err(dev, "failed to get a INTx IRQ domain\n"); + return -EINVAL; + } + + return 0; +} + static void rockchip_pcie_enable_ltssm(struct rockchip_pcie *rockchip) { rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_ENABLE_LTSSM, @@ -111,7 +190,20 @@ static int rockchip_pcie_host_init(struct pcie_port *pp) { struct dw_pcie *pci = to_dw_pcie_from_pp(pp); struct rockchip_pcie *rockchip = to_rockchip_pcie(pci); + struct device *dev = rockchip->pci.dev; u32 val = HIWORD_UPDATE_BIT(PCIE_LTSSM_ENABLE_ENHANCE); + int irq, ret; + + irq = of_irq_get_byname(dev->of_node, "legacy"); + if (irq < 0) + return irq; + + ret = rockchip_pcie_init_irq_domain(rockchip); + if (ret < 0) + dev_err(dev, "failed to init irq domain\n"); + + irq_set_chained_handler_and_data(irq, rockchip_pcie_legacy_int_handler, + rockchip); /* LTSSM enable control mode */ rockchip_pcie_writel_apb(rockchip, val, PCIE_CLIENT_HOT_RESET_CTRL);