From patchwork Fri Aug 21 03:53:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rob Herring (Arm)" X-Patchwork-Id: 11727705 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4B302138C for ; Fri, 21 Aug 2020 03:55:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 33024208C7 for ; Fri, 21 Aug 2020 03:55:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597982128; bh=bcHB6OwubM3RwEtC3+DCcNgQ0rORiPQIa90y+RIyw9A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FL2GaOsTcHB57z1O27tkCi0SW6ZjWAni9tfhIVR0z1r3HmBpOuLQqwqUesYrFbKew 0SUHPEYac+5YP0wt5I7BoS7v28jjVBp0kcWxOwGkd9C6NLR7rReOP2f0j0mFa/aVuW VxHPL8/gkydcd7TbyBI3JfSMq91ue4Wirg4IvOTc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727090AbgHUDz1 (ORCPT ); Thu, 20 Aug 2020 23:55:27 -0400 Received: from mail-il1-f193.google.com ([209.85.166.193]:38762 "EHLO mail-il1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727841AbgHUDzV (ORCPT ); Thu, 20 Aug 2020 23:55:21 -0400 Received: by mail-il1-f193.google.com with SMTP id 77so337794ilc.5; Thu, 20 Aug 2020 20:55:19 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=nzA5Li0O8wMWcSVtXd/0wN/DTjqwQIp+nFPJ5Byn0Ao=; b=Zsu09IIVotTBL7XD8OZHbaAD7kKw4RsGoAjMd8XgBt3MUjgsuLzHFUD+0OtwTPf3gY aJNZhqoyN4kkZffeWhp8Wu5dgiAvNKUiM86425KTVWv6JCBzAIjlI8kM/34Apl7k81Ds 3auATMuRwC89JGmQ+6Epqt1foPJpBeQRJtwW6ZNFNBQkBeSoVHqBHAfvzzZMp+T21+im MNELfu1X+SMtslxI7bts248j2T/ASHUAZDiIrLBvHDIs6VQgloKLABEvFmtdCLobwN1V vybFsz8nYNS1zRM0npufgsVyS6ug+DjSjQcFtaXb1hS8e4i8NUHQccNEpKTI7uc2grJX hkpg== X-Gm-Message-State: AOAM532xBqNnWm/0yiNelgVNwt9yKtQCV40tX4TstIJZARr8TJX6ewad TtSCY7ZgczvyoAzfK4U+MQ== X-Google-Smtp-Source: ABdhPJzc1LE/Tdy0xRmiGMzYiTEmO8pmLRpngToU2Ig8re+Zg0QljB3LIZO9lG4SEHYgPPOeBnT1rg== X-Received: by 2002:a92:a302:: with SMTP id a2mr1022465ili.116.1597982119184; Thu, 20 Aug 2020 20:55:19 -0700 (PDT) Received: from xps15.herring.priv ([64.188.179.249]) by smtp.googlemail.com with ESMTPSA id 79sm413923ilc.9.2020.08.20.20.55.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Aug 2020 20:55:18 -0700 (PDT) From: Rob Herring To: Bjorn Helgaas , Lorenzo Pieralisi Cc: linux-pci@vger.kernel.org, Andy Gross , Binghui Wang , Bjorn Andersson , Dilip Kota , Fabio Estevam , Gustavo Pimentel , Jerome Brunet , Jesper Nilsson , Jingoo Han , Jonathan Chocron , Jonathan Hunter , Kevin Hilman , Kishon Vijay Abraham I , Krzysztof Kozlowski , Kukjin Kim , Kunihiko Hayashi , Lucas Stach , Martin Blumenstingl , Masahiro Yamada , Murali Karicheri , Neil Armstrong , NXP Linux Team , Pengutronix Kernel Team , Pratyush Anand , Richard Zhu , Sascha Hauer , Shawn Guo , Shawn Guo , Stanimir Varbanov , Thierry Reding , Xiaowei Song , Yue Wang , Marc Zyngier , linux-amlogic@lists.infradead.org, linux-arm-kernel@axis.com, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-omap@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-tegra@vger.kernel.org Subject: [PATCH v2 13/40] PCI: dwc: Use generic config accessors Date: Thu, 20 Aug 2020 21:53:53 -0600 Message-Id: <20200821035420.380495-14-robh@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200821035420.380495-1-robh@kernel.org> References: <20200821035420.380495-1-robh@kernel.org> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org Now that all the platforms with custom config access handling define their own pci_ops, let's split the default config accessors to use different pci_ops for root and child buses. With this, we can use the generic config accessors. The child bus accesses mainly require a .map_bus() hook to reconfigure the iATU on each config space access. Cc: Jingoo Han Cc: Gustavo Pimentel Cc: Lorenzo Pieralisi Cc: Bjorn Helgaas Signed-off-by: Rob Herring --- .../pci/controller/dwc/pcie-designware-host.c | 119 ++++++------------ 1 file changed, 37 insertions(+), 82 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index 33e632a24466..07791b4ebaa7 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -20,24 +20,7 @@ #include "pcie-designware.h" static struct pci_ops dw_pcie_ops; - -static int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size, - u32 *val) -{ - struct dw_pcie *pci; - - pci = to_dw_pcie_from_pp(pp); - return dw_pcie_read(pci->dbi_base + where, size, val); -} - -static int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size, - u32 val) -{ - struct dw_pcie *pci; - - pci = to_dw_pcie_from_pp(pp); - return dw_pcie_write(pci->dbi_base + where, size, val); -} +static struct pci_ops dw_child_pcie_ops; static void dw_msi_ack_irq(struct irq_data *d) { @@ -443,7 +426,7 @@ int dw_pcie_host_init(struct pcie_port *pp) /* Set default bus ops */ bridge->ops = &dw_pcie_ops; - bridge->child_ops = &dw_pcie_ops; + bridge->child_ops = &dw_child_pcie_ops; if (pp->ops->host_init) { ret = pp->ops->host_init(pp); @@ -487,14 +470,14 @@ void dw_pcie_host_deinit(struct pcie_port *pp) } EXPORT_SYMBOL_GPL(dw_pcie_host_deinit); -static int dw_pcie_access_other_conf(struct pcie_port *pp, struct pci_bus *bus, - u32 devfn, int where, int size, u32 *val, - bool write) +static void __iomem *dw_pcie_other_conf_map_bus(struct pci_bus *bus, + unsigned int devfn, int where) { - int ret, type; + int type; u32 busdev, cfg_size; u64 cpu_addr; void __iomem *va_cfg_base; + struct pcie_port *pp = bus->sysdata; struct dw_pcie *pci = to_dw_pcie_from_pp(pp); busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) | @@ -515,79 +498,50 @@ static int dw_pcie_access_other_conf(struct pcie_port *pp, struct pci_bus *bus, dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1, type, cpu_addr, busdev, cfg_size); - if (write) - ret = dw_pcie_write(va_cfg_base + where, size, *val); - else - ret = dw_pcie_read(va_cfg_base + where, size, val); - if (pci->num_viewport <= 2) - dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1, - PCIE_ATU_TYPE_IO, pp->io_base, - pp->io_bus_addr, pp->io_size); - - return ret; -} - -static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus, - u32 devfn, int where, int size, u32 *val) -{ - return dw_pcie_access_other_conf(pp, bus, devfn, where, size, val, - false); + return va_cfg_base + where; } -static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus, - u32 devfn, int where, int size, u32 val) -{ - return dw_pcie_access_other_conf(pp, bus, devfn, where, size, &val, - true); -} - -static int dw_pcie_valid_device(struct pcie_port *pp, struct pci_bus *bus, - int dev) -{ - struct dw_pcie *pci = to_dw_pcie_from_pp(pp); - - /* If there is no link, then there is no device */ - if (!pci_is_root_bus(bus)) { - if (!dw_pcie_link_up(pci)) - return 0; - } else if (dev > 0) - /* Access only one slot on each root port */ - return 0; - - return 1; -} - -static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where, - int size, u32 *val) +static int dw_pcie_rd_other_conf(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 *val) { + int ret; struct pcie_port *pp = bus->sysdata; + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); - if (!dw_pcie_valid_device(pp, bus, PCI_SLOT(devfn))) { - *val = 0xffffffff; - return PCIBIOS_DEVICE_NOT_FOUND; - } + ret = pci_generic_config_read(bus, devfn, where, size, val); - if (pci_is_root_bus(bus)) - return dw_pcie_rd_own_conf(pp, where, size, val); + if (!ret && pci->num_viewport <= 2) + dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1, + PCIE_ATU_TYPE_IO, pp->io_base, + pp->io_bus_addr, pp->io_size); - return dw_pcie_rd_other_conf(pp, bus, devfn, where, size, val); + return ret; } -static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn, - int where, int size, u32 val) +static int dw_pcie_wr_other_conf(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 val) { + int ret; struct pcie_port *pp = bus->sysdata; + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); - if (!dw_pcie_valid_device(pp, bus, PCI_SLOT(devfn))) - return PCIBIOS_DEVICE_NOT_FOUND; + ret = pci_generic_config_write(bus, devfn, where, size, val); - if (pci_is_root_bus(bus)) - return dw_pcie_wr_own_conf(pp, where, size, val); + if (!ret && pci->num_viewport <= 2) + dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1, + PCIE_ATU_TYPE_IO, pp->io_base, + pp->io_bus_addr, pp->io_size); - return dw_pcie_wr_other_conf(pp, bus, devfn, where, size, val); + return ret; } +static struct pci_ops dw_child_pcie_ops = { + .map_bus = dw_pcie_other_conf_map_bus, + .read = dw_pcie_rd_other_conf, + .write = dw_pcie_wr_other_conf, +}; + void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, int where) { struct pcie_port *pp = bus->sysdata; @@ -600,8 +554,9 @@ void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, } static struct pci_ops dw_pcie_ops = { - .read = dw_pcie_rd_conf, - .write = dw_pcie_wr_conf, + .map_bus = dw_pcie_own_conf_map_bus, + .read = pci_generic_config_read, + .write = pci_generic_config_write, }; void dw_pcie_setup_rc(struct pcie_port *pp) @@ -660,7 +615,7 @@ void dw_pcie_setup_rc(struct pcie_port *pp) * the platform uses its own address translation component rather than * ATU, so we should not program the ATU here. */ - if (pp->bridge->child_ops == &dw_pcie_ops && !pp->ops->rd_other_conf) { + if (pp->bridge->child_ops == &dw_child_pcie_ops) { dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX0, PCIE_ATU_TYPE_MEM, pp->mem_base, pp->mem_bus_addr, pp->mem_size);