From patchwork Mon Nov 23 13:51:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kumar, M Chetan" X-Patchwork-Id: 331998 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 5A612C6379F for ; Mon, 23 Nov 2020 13:52:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 239ED2075A for ; Mon, 23 Nov 2020 13:52:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729929AbgKWNvz (ORCPT ); Mon, 23 Nov 2020 08:51:55 -0500 Received: from mga14.intel.com ([192.55.52.115]:1467 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729455AbgKWNvz (ORCPT ); Mon, 23 Nov 2020 08:51:55 -0500 IronPort-SDR: HF5z9zPQznQlLzXPWez9YgSGLp7c8KX22jPQP3VspdtdLtm673FnRDKdtsc18PaevFUCRl4Inn P4ZaLgAFO3Uw== X-IronPort-AV: E=McAfee;i="6000,8403,9813"; a="170981415" X-IronPort-AV: E=Sophos;i="5.78,363,1599548400"; d="scan'208";a="170981415" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Nov 2020 05:51:54 -0800 IronPort-SDR: 5NlwpLIH2Qo+ZO4m3d2sJv9cOZw4Ms5LMl1lbdK6O+9XGTWGVF/DnBGT997EKa34yV/arWgTDh aPt2YpNJJhKQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.78,363,1599548400"; d="scan'208";a="370035473" Received: from bgsxx0031.iind.intel.com ([10.106.222.40]) by orsmga007.jf.intel.com with ESMTP; 23 Nov 2020 05:51:52 -0800 From: M Chetan Kumar To: netdev@vger.kernel.org, linux-wireless@vger.kernel.org Cc: johannes@sipsolutions.net, krishna.c.sudi@intel.com, m.chetan.kumar@intel.com Subject: [RFC 02/18] net: iosm: irq handling Date: Mon, 23 Nov 2020 19:21:07 +0530 Message-Id: <20201123135123.48892-3-m.chetan.kumar@intel.com> X-Mailer: git-send-email 2.12.3 In-Reply-To: <20201123135123.48892-1-m.chetan.kumar@intel.com> References: <20201123135123.48892-1-m.chetan.kumar@intel.com> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org 1) Request interrupt vector, frees allocated resource. 2) Registers IRQ handler. Signed-off-by: M Chetan Kumar --- drivers/net/wwan/iosm/iosm_ipc_irq.c | 95 ++++++++++++++++++++++++++++++++++++ drivers/net/wwan/iosm/iosm_ipc_irq.h | 35 +++++++++++++ 2 files changed, 130 insertions(+) create mode 100644 drivers/net/wwan/iosm/iosm_ipc_irq.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_irq.h diff --git a/drivers/net/wwan/iosm/iosm_ipc_irq.c b/drivers/net/wwan/iosm/iosm_ipc_irq.c new file mode 100644 index 000000000000..b9e1bc7959db --- /dev/null +++ b/drivers/net/wwan/iosm/iosm_ipc_irq.c @@ -0,0 +1,95 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2020 Intel Corporation. + */ + +#include "iosm_ipc_pcie.h" +#include "iosm_ipc_protocol.h" + +/* Write to the specified register offset for doorbell interrupt */ +static inline void write_dbell_reg(struct iosm_pcie *ipc_pcie, int irq_n, + u32 data) +{ + void __iomem *write_reg; + + /* Select the first doorbell register, which is only currently needed + * by CP. + */ + write_reg = (void __iomem *)((u8 __iomem *)ipc_pcie->ipc_regs + + ipc_pcie->doorbell_write + + (irq_n * ipc_pcie->doorbell_reg_offset)); + + /* Fire the doorbell irq by writing data on the doorbell write pointer + * register. + */ + iowrite32(data, write_reg); +} + +void ipc_doorbell_fire(struct iosm_pcie *ipc_pcie, int irq_n, u32 data) +{ + if (!ipc_pcie || !ipc_pcie->ipc_regs) + return; + + write_dbell_reg(ipc_pcie, irq_n, data); +} + +/* Threaded Interrupt handler for MSI interrupts */ +static irqreturn_t ipc_msi_interrupt(int irq, void *dev_id) +{ + struct iosm_pcie *ipc_pcie = dev_id; + int instance = irq - ipc_pcie->pci->irq; + + /* Shift the MSI irq actions to the IPC tasklet. IRQ_NONE means the + * irq was not from the IPC device or could not be served. + */ + if (instance >= ipc_pcie->nvec) + return IRQ_NONE; + + ipc_imem_irq_process(ipc_pcie->imem, instance); + + return IRQ_HANDLED; +} + +void ipc_release_irq(struct iosm_pcie *ipc_pcie) +{ + struct pci_dev *pdev = ipc_pcie->pci; + + if (pdev->msi_enabled) { + while (--ipc_pcie->nvec >= 0) + free_irq(pdev->irq + ipc_pcie->nvec, ipc_pcie); + } + pci_free_irq_vectors(pdev); +} + +int ipc_acquire_irq(struct iosm_pcie *ipc_pcie) +{ + struct pci_dev *pdev = ipc_pcie->pci; + int i, rc = 0; + + ipc_pcie->nvec = pci_alloc_irq_vectors(pdev, IPC_MSI_VECTORS, + IPC_MSI_VECTORS, PCI_IRQ_MSI); + + if (ipc_pcie->nvec < 0) + return ipc_pcie->nvec; + + if (!pdev->msi_enabled) { + rc = -1; + goto error; + } + + for (i = 0; i < ipc_pcie->nvec; ++i) { + rc = request_threaded_irq(pdev->irq + i, NULL, + ipc_msi_interrupt, 0, KBUILD_MODNAME, + ipc_pcie); + if (rc) { + dev_err(ipc_pcie->dev, "unable to grab IRQ %d, rc=%d", + pdev->irq, rc); + ipc_pcie->nvec = i; + ipc_release_irq(ipc_pcie); + goto error; + } + } + +error: + return rc; +} diff --git a/drivers/net/wwan/iosm/iosm_ipc_irq.h b/drivers/net/wwan/iosm/iosm_ipc_irq.h new file mode 100644 index 000000000000..db207cb95a8a --- /dev/null +++ b/drivers/net/wwan/iosm/iosm_ipc_irq.h @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0-only + * + * Copyright (C) 2020 Intel Corporation. + */ + +#ifndef IOSM_IPC_IRQ_H +#define IOSM_IPC_IRQ_H + +#include "iosm_ipc_pcie.h" + +struct iosm_pcie; + +/** + * ipc_doorbell_fire - fire doorbell to CP + * @ipc_pcie: Pointer to iosm_pcie + * @irq_n: Doorbell type + * @data: ipc state + */ +void ipc_doorbell_fire(struct iosm_pcie *ipc_pcie, int irq_n, u32 data); + +/** + * ipc_release_irq - Remove the IRQ handler. + * @ipc_pcie: Pointer to iosm_pcie struct + */ +void ipc_release_irq(struct iosm_pcie *ipc_pcie); + +/** + * ipc_acquire_irq - Install the IPC IRQ handler. + * @ipc_pcie: Pointer to iosm_pcie struct + * + * Return: 0 on success and -1 on failure + */ +int ipc_acquire_irq(struct iosm_pcie *ipc_pcie); + +#endif