From patchwork Wed Dec 20 19:10:33 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Timur Tabi X-Patchwork-Id: 851648 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=codeaurora.org header.i=@codeaurora.org header.b="nj6Q4Wp1"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="a2qCqjeH"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3z249c4PRqz9t3t for ; Thu, 21 Dec 2017 06:10:44 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756384AbdLTTKo (ORCPT ); Wed, 20 Dec 2017 14:10:44 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:60588 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756342AbdLTTKl (ORCPT ); Wed, 20 Dec 2017 14:10:41 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 684BD60590; Wed, 20 Dec 2017 19:10:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1513797041; bh=+3+3+GiDpTvD/skRnmId07Fe/GhLztA5YFx2dgKUQqc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nj6Q4Wp1xPc3zZb0N2c+onhgRwYuKPmYHShoeOPK8u/GsbvuWfBslYZv4OF1IZkYq 6djU6WIPOE/c8eol9LQvv/KNLdJYNCji+r0N73caPws/htKFlAqd8fMU+xsb+IMUih m0xPBfoT+A9yC4t2krbZltGvdFvz8Vvn+9FcwBdA= X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.8 required=2.0 tests=ALL_TRUSTED,BAYES_00, DKIM_SIGNED, T_DKIM_INVALID autolearn=no autolearn_force=no version=3.4.0 Received: from timur-ubuntu.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: timur@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id A85CF60B14; Wed, 20 Dec 2017 19:10:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1513797040; bh=+3+3+GiDpTvD/skRnmId07Fe/GhLztA5YFx2dgKUQqc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=a2qCqjeHGZHqxZCDs3lE+oIcZCg7Ieb84IvSi1jODMDppQaVyctTnR6EWIr/0JiU1 H5WIz8h11goc/SiVmnxSI20B+/F5vlQ6GT2EhVVzhqdyjSs4MfM9uWbAhVcfyvYMnS btelatjDwjb0q2F87KXnhu7WMJ6O9+0e4PU4d2Jc= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org A85CF60B14 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=timur@codeaurora.org From: Timur Tabi To: linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, Linus Walleij , Andy Shevchenko , Mika Westerberg , thierry.reding@gmail.com, Stephen Boyd , david.brown@linaro.org, andy.gross@linaro.org, Bjorn Andersson , Varadarajan Narayanan , Archit Taneja Cc: timur@codeaurora.org Subject: [PATCH 3/3] [v7] pinctrl: qcom: qdf2xxx: add support for new ACPI HID QCOM8002 Date: Wed, 20 Dec 2017 13:10:33 -0600 Message-Id: <1513797033-9494-4-git-send-email-timur@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1513797033-9494-1-git-send-email-timur@codeaurora.org> References: <1513797033-9494-1-git-send-email-timur@codeaurora.org> Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Newer versions of the firmware for the Qualcomm Datacenter Technologies QDF2400 restricts access to a subset of the GPIOs on the TLMM. To prevent older kernels from accidentally accessing the restricted GPIOs, we change the ACPI HID for the TLMM block from QCOM8001 to QCOM8002, and introduce a new property "gpios". This property is an array of specific GPIOs that are accessible. When an older kernel boots on newer (restricted) firmware, it will fail to probe. To implement the sparse GPIO map, we register all of the GPIOs, but set the pin count for the unavailable GPIOs to zero. The pinctrl-msm driver will block those unavailable GPIOs from being accessed. Support for QCOM8001 is removed as there is no longer any firmware that implements it. Signed-off-by: Timur Tabi --- drivers/pinctrl/qcom/pinctrl-qdf2xxx.c | 96 ++++++++++++++++++++++------------ 1 file changed, 64 insertions(+), 32 deletions(-) diff --git a/drivers/pinctrl/qcom/pinctrl-qdf2xxx.c b/drivers/pinctrl/qcom/pinctrl-qdf2xxx.c index bb3ce5c3e18b..f8ba58dd4d07 100644 --- a/drivers/pinctrl/qcom/pinctrl-qdf2xxx.c +++ b/drivers/pinctrl/qcom/pinctrl-qdf2xxx.c @@ -32,7 +32,7 @@ static struct msm_pinctrl_soc_data qdf2xxx_pinctrl; -/* A reasonable limit to the number of GPIOS */ +/* A maximum of 256 allows us to use a u8 array to hold the GPIO numbers */ #define MAX_GPIOS 256 /* maximum size of each gpio name (enough room for "gpioXXX" + null) */ @@ -45,59 +45,91 @@ static int qdf2xxx_pinctrl_probe(struct platform_device *pdev) char (*names)[NAME_SIZE]; unsigned int i; u32 num_gpios; + unsigned int avail_gpios; /* The number of GPIOs we support */ + u8 gpios[MAX_GPIOS]; /* An array of supported GPIOs */ int ret; /* Query the number of GPIOs from ACPI */ ret = device_property_read_u32(&pdev->dev, "num-gpios", &num_gpios); if (ret < 0) { - dev_warn(&pdev->dev, "missing num-gpios property\n"); + dev_err(&pdev->dev, "missing 'num-gpios' property\n"); return ret; } - if (!num_gpios || num_gpios > MAX_GPIOS) { - dev_warn(&pdev->dev, "invalid num-gpios property\n"); + dev_err(&pdev->dev, "invalid 'num-gpios' property\n"); + return -ENODEV; + } + + /* The number of GPIOs in the approved list */ + ret = device_property_read_u8_array(&pdev->dev, "gpios", NULL, 0); + if (ret < 0) { + dev_err(&pdev->dev, "missing 'gpios' property\n"); + return ret; + } + /* + * The number of available GPIOs should be non-zero, and no + * more than the total number of GPIOS. + */ + if (!ret || ret > num_gpios) { + dev_err(&pdev->dev, "invalid 'gpios' property\n"); return -ENODEV; } + avail_gpios = ret; + + ret = device_property_read_u8_array(&pdev->dev, "gpios", gpios, + avail_gpios); + if (ret < 0) { + dev_err(&pdev->dev, "could not read list of GPIOs\n"); + return ret; + } pins = devm_kcalloc(&pdev->dev, num_gpios, sizeof(struct pinctrl_pin_desc), GFP_KERNEL); groups = devm_kcalloc(&pdev->dev, num_gpios, sizeof(struct msm_pingroup), GFP_KERNEL); - names = devm_kcalloc(&pdev->dev, num_gpios, NAME_SIZE, GFP_KERNEL); + names = devm_kcalloc(&pdev->dev, avail_gpios, NAME_SIZE, GFP_KERNEL); if (!pins || !groups || !names) return -ENOMEM; + /* + * Initialize the array. GPIOs not listed in the 'gpios' array + * still need a number, but nothing else. + */ for (i = 0; i < num_gpios; i++) { - snprintf(names[i], NAME_SIZE, "gpio%u", i); - pins[i].number = i; - pins[i].name = names[i]; - - groups[i].npins = 1; - groups[i].name = names[i]; groups[i].pins = &pins[i].number; + } - groups[i].ctl_reg = 0x10000 * i; - groups[i].io_reg = 0x04 + 0x10000 * i; - groups[i].intr_cfg_reg = 0x08 + 0x10000 * i; - groups[i].intr_status_reg = 0x0c + 0x10000 * i; - groups[i].intr_target_reg = 0x08 + 0x10000 * i; - - groups[i].mux_bit = 2; - groups[i].pull_bit = 0; - groups[i].drv_bit = 6; - groups[i].oe_bit = 9; - groups[i].in_bit = 0; - groups[i].out_bit = 1; - groups[i].intr_enable_bit = 0; - groups[i].intr_status_bit = 0; - groups[i].intr_target_bit = 5; - groups[i].intr_target_kpss_val = 1; - groups[i].intr_raw_status_bit = 4; - groups[i].intr_polarity_bit = 1; - groups[i].intr_detection_bit = 2; - groups[i].intr_detection_width = 2; + /* Populate the entries that are meant to be exposed as GPIOs. */ + for (i = 0; i < avail_gpios; i++) { + unsigned int gpio = gpios[i]; + + groups[gpio].npins = 1; + snprintf(names[i], NAME_SIZE, "gpio%u", gpio); + pins[gpio].name = names[i]; + groups[gpio].name = names[i]; + + groups[gpio].ctl_reg = 0x10000 * gpio; + groups[gpio].io_reg = 0x04 + 0x10000 * gpio; + groups[gpio].intr_cfg_reg = 0x08 + 0x10000 * gpio; + groups[gpio].intr_status_reg = 0x0c + 0x10000 * gpio; + groups[gpio].intr_target_reg = 0x08 + 0x10000 * gpio; + + groups[gpio].mux_bit = 2; + groups[gpio].pull_bit = 0; + groups[gpio].drv_bit = 6; + groups[gpio].oe_bit = 9; + groups[gpio].in_bit = 0; + groups[gpio].out_bit = 1; + groups[gpio].intr_enable_bit = 0; + groups[gpio].intr_status_bit = 0; + groups[gpio].intr_target_bit = 5; + groups[gpio].intr_target_kpss_val = 1; + groups[gpio].intr_raw_status_bit = 4; + groups[gpio].intr_polarity_bit = 1; + groups[gpio].intr_detection_bit = 2; + groups[gpio].intr_detection_width = 2; } qdf2xxx_pinctrl.pins = pins; @@ -110,7 +142,7 @@ static int qdf2xxx_pinctrl_probe(struct platform_device *pdev) } static const struct acpi_device_id qdf2xxx_acpi_ids[] = { - {"QCOM8001"}, + {"QCOM8002"}, {}, }; MODULE_DEVICE_TABLE(acpi, qdf2xxx_acpi_ids);