From patchwork Mon Jun 6 16:41:30 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 579254 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 AA726CCA473 for ; Mon, 6 Jun 2022 16:46:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241987AbiFFQq1 (ORCPT ); Mon, 6 Jun 2022 12:46:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37984 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230448AbiFFQq0 (ORCPT ); Mon, 6 Jun 2022 12:46:26 -0400 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9A8A415BAE2; Mon, 6 Jun 2022 09:46:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1654533985; x=1686069985; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Y7E4CLRa6BgtD+lqadZc0VtoWUMuhkwoVujS7HBVdOA=; b=Bb5yvQn4U7Unc9LHRwuLc04qwcd5V/mfjRBnCgR2HF9A2v+KJzkVOXLe mm6EDL3YHal8FT3YP1l/6lbwO/Gxy75TjBJouBjwJHFy+YuCITLN3f57U NkhltW0TP+EfhITZbVmChU2cmRM5TLds8TxWppW+mAas9Zrk8FmrYe2mS GkzqD/9YiGw67C12a+cJ5pzGAjS938SQhtnwQJ6rr+5RJeV5rl7QQ3Nz/ J87s6fYWAd3mYk9vYbQnHlbxA1qd8Ugpb6m5Zycc8mcqgKuIIXG5NZAOr wB0XsHyyxtRD4F7zcSHNw5XXy1jeliQRbN3Z/EkIqvgFmY+6GdcjUk575 A==; X-IronPort-AV: E=McAfee;i="6400,9594,10370"; a="259081431" X-IronPort-AV: E=Sophos;i="5.91,280,1647327600"; d="scan'208";a="259081431" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Jun 2022 09:41:54 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.91,280,1647327600"; d="scan'208";a="532206862" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga003.jf.intel.com with ESMTP; 06 Jun 2022 09:41:47 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id 8A9D6B85; Mon, 6 Jun 2022 19:41:50 +0300 (EEST) From: Andy Shevchenko To: Tony Luck , Andy Shevchenko , Wolfram Sang , Jean Delvare , Heiner Kallweit , Henning Schild , Lee Jones , Mika Westerberg , Hans de Goede , Linus Walleij , Jonathan Yong , Guenter Roeck , Wim Van Sebroeck , linux-kernel@vger.kernel.org, linux-edac@vger.kernel.org, linux-i2c@vger.kernel.org, linux-leds@vger.kernel.org, linux-gpio@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-watchdog@vger.kernel.org Cc: Borislav Petkov , Mauro Carvalho Chehab , James Morse , Robert Richter , Jean Delvare , Pavel Machek , Peter Tyser , Andy Shevchenko , Mark Gross Subject: [PATCH v6 04/12] mfd: lpc_ich: Switch to generic p2sb_bar() Date: Mon, 6 Jun 2022 19:41:30 +0300 Message-Id: <20220606164138.66535-5-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220606164138.66535-1-andriy.shevchenko@linux.intel.com> References: <20220606164138.66535-1-andriy.shevchenko@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org Instead of open coding p2sb_bar() functionality we are going to use generic library. There is one more user en route. This is more than just a clean-up. It also fixes a potential issue seen when SPI BAR is 64-bit. The current code works if and only if the PCI BAR of the hidden device is inside 4G address space. In case when firmware decides to go above 4G, we will get a wrong address. Signed-off-by: Andy Shevchenko Tested-by: Henning Schild Acked-by: Hans de Goede Acked-by: Linus Walleij Acked-for-MFD-by: Lee Jones --- drivers/mfd/Kconfig | 1 + drivers/mfd/lpc_ich.c | 27 ++++++++------------------- 2 files changed, 9 insertions(+), 19 deletions(-) diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 3b59456f5545..9566341de470 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -572,6 +572,7 @@ config LPC_ICH tristate "Intel ICH LPC" depends on PCI select MFD_CORE + select P2SB if X86 help The LPC bridge function of the Intel ICH provides support for many functional units. This driver provides needed support for diff --git a/drivers/mfd/lpc_ich.c b/drivers/mfd/lpc_ich.c index d9175cb8a2d5..e360651c5406 100644 --- a/drivers/mfd/lpc_ich.c +++ b/drivers/mfd/lpc_ich.c @@ -45,6 +45,7 @@ #include #include #include +#include #define ACPIBASE 0x40 #define ACPIBASE_GPE_OFF 0x28 @@ -71,8 +72,6 @@ #define BCR 0xdc #define BCR_WPD BIT(0) -#define SPIBASE_APL_SZ 4096 - #define GPIOBASE_ICH0 0x58 #define GPIOCTRL_ICH0 0x5C #define GPIOBASE_ICH6 0x48 @@ -1134,6 +1133,7 @@ static int lpc_ich_init_spi(struct pci_dev *dev) struct resource *res = &intel_spi_res[0]; struct intel_spi_boardinfo *info; u32 spi_base, rcba; + int ret; info = devm_kzalloc(&dev->dev, sizeof(*info), GFP_KERNEL); if (!info) @@ -1164,30 +1164,19 @@ static int lpc_ich_init_spi(struct pci_dev *dev) } break; - case INTEL_SPI_BXT: { - unsigned int p2sb = PCI_DEVFN(13, 0); - unsigned int spi = PCI_DEVFN(13, 2); - struct pci_bus *bus = dev->bus; - + case INTEL_SPI_BXT: /* * The P2SB is hidden by BIOS and we need to unhide it in * order to read BAR of the SPI flash device. Once that is * done we hide it again. */ - pci_bus_write_config_byte(bus, p2sb, 0xe1, 0x0); - pci_bus_read_config_dword(bus, spi, PCI_BASE_ADDRESS_0, - &spi_base); - if (spi_base != ~0) { - res->start = spi_base & 0xfffffff0; - res->end = res->start + SPIBASE_APL_SZ - 1; - - info->set_writeable = lpc_ich_bxt_set_writeable; - info->data = dev; - } + ret = p2sb_bar(dev->bus, PCI_DEVFN(13, 2), res); + if (ret) + return ret; - pci_bus_write_config_byte(bus, p2sb, 0xe1, 0x1); + info->set_writeable = lpc_ich_bxt_set_writeable; + info->data = dev; break; - } default: return -EINVAL;