From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 AE9CEC433E0 for ; Wed, 8 Jul 2020 19:32:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 94DB2206E2 for ; Wed, 8 Jul 2020 19:32:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="vcgEnvWP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726449AbgGHTcs (ORCPT ); Wed, 8 Jul 2020 15:32:48 -0400 Received: from rnd-relay.smtp.broadcom.com ([192.19.229.170]:60910 "EHLO rnd-relay.smtp.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726306AbgGHTcf (ORCPT ); Wed, 8 Jul 2020 15:32:35 -0400 Received: from mail-irv-17.broadcom.com (mail-irv-17.lvn.broadcom.net [10.75.242.48]) by rnd-relay.smtp.broadcom.com (Postfix) with ESMTP id 333CF30C0D3; Wed, 8 Jul 2020 12:32:34 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.10.3 rnd-relay.smtp.broadcom.com 333CF30C0D3 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=broadcom.com; s=dkimrelay; t=1594236754; bh=T0xu8xfT0eGoWbwtH6Mkr0RTvrMP++v6JyjXzku7s/s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vcgEnvWPiFKj4SlaLJt0rONhMR+1Bt7LB/VhKWXhWP7i58TGEcnEPkLCZMhoRP5uM /iWjDkDCIPPSbhPOjGhj7UZl8/oAE208M3d6DJ0DRLvddiveKHL1+UmcdFaiJCRgI0 RsoMOdjGHQ/IlvEDhoRiNl1BgB9nWUEL/rIh9GJc= Received: from stbsrv-and-01.and.broadcom.net (stbsrv-and-01.and.broadcom.net [10.28.16.211]) by mail-irv-17.broadcom.com (Postfix) with ESMTP id A743C14008B; Wed, 8 Jul 2020 12:32:32 -0700 (PDT) From: Jim Quinlan To: linux-pci@vger.kernel.org, Nicolas Saenz Julienne , bcm-kernel-feedback-list@broadcom.com, james.quinlan@broadcom.com Cc: Jim Quinlan , Lorenzo Pieralisi , Rob Herring , Bjorn Helgaas , Florian Fainelli , linux-rpi-kernel@lists.infradead.org (moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE), linux-arm-kernel@lists.infradead.org (moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v7 06/12] PCI: brcmstb: Add bcm7278 PERST# support Date: Wed, 8 Jul 2020 15:31:59 -0400 Message-Id: <20200708193219.47134-7-james.quinlan@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200708193219.47134-1-james.quinlan@broadcom.com> References: <20200708193219.47134-1-james.quinlan@broadcom.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jim Quinlan The PERST# bit was moved to a different register in 7278-type STB chips. In addition, the polarity of the bit was also changed; for other chips writing a 1 specified assert; for 7278-type chips, writing a 0 specifies assert. Of course, PERST# is a PCIe asserted-low signal. Signed-off-by: Jim Quinlan Acked-by: Florian Fainelli --- drivers/pci/controller/pcie-brcmstb.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c index 7c148eb65170..e5e7f7d82eda 100644 --- a/drivers/pci/controller/pcie-brcmstb.c +++ b/drivers/pci/controller/pcie-brcmstb.c @@ -83,6 +83,7 @@ #define PCIE_MISC_PCIE_CTRL 0x4064 #define PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK 0x1 +#define PCIE_MISC_PCIE_CTRL_PCIE_PERSTB_MASK 0x4 #define PCIE_MISC_PCIE_STATUS 0x4068 #define PCIE_MISC_PCIE_STATUS_PCIE_PORT_MASK 0x80 @@ -685,9 +686,16 @@ static inline void brcm_pcie_perst_set(struct brcm_pcie *pcie, u32 val) { u32 tmp; - tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1(pcie)); - u32p_replace_bits(&tmp, val, PCIE_RGR1_SW_INIT_1_PERST_MASK); - writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1(pcie)); + if (pcie->type == BCM7278) { + /* Perst bit has moved and assert value is 0 */ + tmp = readl(pcie->base + PCIE_MISC_PCIE_CTRL); + u32p_replace_bits(&tmp, !val, PCIE_MISC_PCIE_CTRL_PCIE_PERSTB_MASK); + writel(tmp, pcie->base + PCIE_MISC_PCIE_CTRL); + } else { + tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1(pcie)); + u32p_replace_bits(&tmp, val, PCIE_RGR1_SW_INIT_1_PERST_MASK); + writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1(pcie)); + } } static inline int brcm_pcie_get_rc_bar2_size_and_offset(struct brcm_pcie *pcie, @@ -772,7 +780,10 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie) /* Reset the bridge */ brcm_pcie_bridge_sw_init_set(pcie, 1); - brcm_pcie_perst_set(pcie, 1); + + /* BCM7278 fails when PERST# is set here */ + if (pcie->type != BCM7278) + brcm_pcie_perst_set(pcie, 1); usleep_range(100, 200); -- 2.17.1