From patchwork Mon May 2 09:38:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hector Martin X-Patchwork-Id: 12834061 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com 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 0F830C433EF for ; Mon, 2 May 2022 09:39:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349916AbiEBJmg (ORCPT ); Mon, 2 May 2022 05:42:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44884 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1384281AbiEBJme (ORCPT ); Mon, 2 May 2022 05:42:34 -0400 Received: from mail.marcansoft.com (marcansoft.com [IPv6:2a01:298:fe:f::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 38F0448396 for ; Mon, 2 May 2022 02:39:05 -0700 (PDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: hector@marcansoft.com) by mail.marcansoft.com (Postfix) with ESMTPSA id 4639E41982; Mon, 2 May 2022 09:38:58 +0000 (UTC) From: Hector Martin To: Marc Zyngier Cc: Hector Martin , Lorenzo Pieralisi , Rob Herring , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Bjorn Helgaas , Alyssa Rosenzweig , Sven Peter , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/3] PCI: apple: Add support for optional PWREN GPIO Date: Mon, 2 May 2022 18:38:32 +0900 Message-Id: <20220502093832.32778-4-marcan@marcan.st> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220502093832.32778-1-marcan@marcan.st> References: <20220502093832.32778-1-marcan@marcan.st> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org WiFi and SD card devices on M1 Macs have a separate power enable GPIO. Add support for this to the PCIe controller. This is modeled after how pcie-fu740 does it. Signed-off-by: Hector Martin Acked-by: Marc Zyngier --- drivers/pci/controller/pcie-apple.c | 35 ++++++++++++++++++++++++++--- 1 file changed, 32 insertions(+), 3 deletions(-) diff --git a/drivers/pci/controller/pcie-apple.c b/drivers/pci/controller/pcie-apple.c index e3aa2d461739..5b73c03ebe94 100644 --- a/drivers/pci/controller/pcie-apple.c +++ b/drivers/pci/controller/pcie-apple.c @@ -518,6 +518,16 @@ static int apple_pcie_probe_port(struct device_node *np) } gpiod_put(gd); + + gd = gpiod_get_from_of_node(np, "pwren-gpios", 0, + GPIOD_OUT_LOW, "PWREN"); + if (IS_ERR(gd)) { + if (PTR_ERR(gd) != -ENOENT) + return PTR_ERR(gd); + } else { + gpiod_put(gd); + } + return 0; } @@ -526,7 +536,7 @@ static int apple_pcie_setup_port(struct apple_pcie *pcie, { struct platform_device *platform = to_platform_device(pcie->dev); struct apple_pcie_port *port; - struct gpio_desc *reset; + struct gpio_desc *reset, *pwren = NULL; u32 stat, idx; int ret, i; @@ -535,6 +545,15 @@ static int apple_pcie_setup_port(struct apple_pcie *pcie, if (IS_ERR(reset)) return PTR_ERR(reset); + pwren = devm_gpiod_get_from_of_node(pcie->dev, np, "pwren-gpios", 0, + GPIOD_OUT_LOW, "PWREN"); + if (IS_ERR(pwren)) { + if (PTR_ERR(pwren) == -ENOENT) + pwren = NULL; + else + return PTR_ERR(pwren); + } + port = devm_kzalloc(pcie->dev, sizeof(*port), GFP_KERNEL); if (!port) return -ENOMEM; @@ -557,12 +576,22 @@ static int apple_pcie_setup_port(struct apple_pcie *pcie, /* Assert PERST# before setting up the clock */ gpiod_set_value_cansleep(reset, 1); + /* Power on the device if required */ + if (pwren) + gpiod_set_value_cansleep(pwren, 1); + ret = apple_pcie_setup_refclk(pcie, port); if (ret < 0) return ret; - /* The minimal Tperst-clk value is 100us (PCIe CEM r5.0, 2.9.2) */ - usleep_range(100, 200); + /* + * The minimal Tperst-clk value is 100us (PCIe CEM r5.0, 2.9.2) + * If powering up, the minimal Tpvperl is 100ms + */ + if (pwren) + msleep(100); + else + usleep_range(100, 200); /* Deassert PERST# */ rmw_set(PORT_PERST_OFF, port->base + PORT_PERST);