From patchwork Mon Jul 25 16:39:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeremy Linton X-Patchwork-Id: 12928269 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 4A6C4C433EF for ; Mon, 25 Jul 2022 16:39:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236190AbiGYQjK (ORCPT ); Mon, 25 Jul 2022 12:39:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36350 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236231AbiGYQjK (ORCPT ); Mon, 25 Jul 2022 12:39:10 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D71A51CFF7; Mon, 25 Jul 2022 09:39:08 -0700 (PDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1719D2B; Mon, 25 Jul 2022 09:39:09 -0700 (PDT) Received: from mammon-tx2.austin.arm.com (mammon-tx2.austin.arm.com [10.118.28.62]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 4C26F3F73D; Mon, 25 Jul 2022 09:39:08 -0700 (PDT) From: Jeremy Linton To: linux-pci@vger.kernel.org Cc: will@kernel.org, bhelgaas@google.com, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, lpieralisi@kernel.org, kw@linux.com, mark.rutland@arm.com, sudeep.holla@arm.com, boqun.feng@gmail.com, catalin.marinas@arm.com, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Jeremy Linton Subject: [PATCH 0/4] PCI SMC conduit, now with DT support Date: Mon, 25 Jul 2022 11:39:01 -0500 Message-Id: <20220725163905.2024437-1-jeremy.linton@arm.com> X-Mailer: git-send-email 2.35.3 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org This is a rebase of the later revisions of [1], but refactored slightly to add a DT method as well. It has all the same advantages of the ACPI method (putting HW quirks in the firmware rather than the kernel) but now applied to a 'pci-host-smc-generic' compatible property which extends the pci-host-generic logic to handle cases where the PCI Config region isn't ECAM compliant. With this in place, and firmware managed clock/phy/etc its possible to run the generic driver on hardware that isn't what one would consider standards compliant PCI root ports. The DT code was tested on the RPi4, where the ACPI/SMC is upstream in TF-A and EDK2. On that platform the PCIe works as expected utilizing the generic host driver rather than the pcie-brcmstb driver. [1] https://lkml.org/lkml/2021/1/4/1255 Jeremy Linton (4): arm64: smccc: Add PCI SMCCCs arm64: PCI: Enable SMC conduit PCI: host-generic: Add firmware managed config ops dt-bindings: PCI: Note the use of pci-host-smc-generic .../bindings/pci/host-generic-pci.yaml | 24 +++- arch/arm64/kernel/pci.c | 109 ++++++++++++++++++ drivers/pci/controller/pci-host-common.c | 34 ++++-- drivers/pci/controller/pci-host-generic.c | 6 + include/linux/arm-smccc.h | 29 +++++ 5 files changed, 186 insertions(+), 16 deletions(-)