From patchwork Wed Sep 9 09:48:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hongtao Wu X-Patchwork-Id: 11765193 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com 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 4643F92C for ; Wed, 9 Sep 2020 09:48:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1BB3F221EC for ; Wed, 9 Sep 2020 09:48:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="nn80wmq4" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729005AbgIIJst (ORCPT ); Wed, 9 Sep 2020 05:48:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50966 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727975AbgIIJsr (ORCPT ); Wed, 9 Sep 2020 05:48:47 -0400 Received: from mail-pj1-x1044.google.com (mail-pj1-x1044.google.com [IPv6:2607:f8b0:4864:20::1044]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 15426C061573; Wed, 9 Sep 2020 02:48:47 -0700 (PDT) Received: by mail-pj1-x1044.google.com with SMTP id u3so1078287pjr.3; Wed, 09 Sep 2020 02:48:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=qQLOx4lboBJj/WJQbW/iAO3Ytg7264C/ffuMfUy96Ug=; b=nn80wmq4XXx2zmLnRo1OM2NtkreT2HFfuQdZYu7hnC9A4VUT9kSMWYzzlv2F2tE2Np 1f5vFqQUspTJH+ZDhQ43Mw0RsnZGnngB14uAy6BkQR46teV/o7yIU5XPO23wV3sibHP8 5cEzQIzRy/5M0bsWS1lmYKwlvtS0XjEebrLqNpbZxmeRNz1leRkdPR1nBFnTaQQrPNZJ 57/ZjoLsz1XBfG2LUumNx2zeIomWZJLsA0HdSpK5R49MwGg7EXX9TxlkpFmYdKLzGG7H F5g0FEQma2hTeZQhQc1niXtSVMhNnFgO0qfHGOs+gPK5CLIC0HscQ0WkG9MTDWACmC4G uWWw== 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; bh=qQLOx4lboBJj/WJQbW/iAO3Ytg7264C/ffuMfUy96Ug=; b=Sub5ft/0mt7DFYtcP80EOoJbrb45wyhQMe0kd8CAGU7Ct6K59rp70enYGv0y/Xm/KZ 86X6U61uI2cz5g72Qp/DKEqRHuTezkM95Y8K0EhJE/f/0hyRMKK9DY+Fr0oZ/0cO94rO 3ImSnMhexlgHjKFit4cxPD8nSmYefnQp0JMAfqvvXxFVZ7/bVkjzrTJNxAcSm7creoJI cET2aL6xRaso+rbAbg6h9DcT2KIIBXN1PebSBGfemfM0NDEyeqecVlwmFwcMwm8k3KE4 ojD2OsLGoBzUHH7bE+gIAI5hzm6MDxsh8HMlWq8aAuGLE8M/Dqu+1qpP+bAAhPjUp1DU TfZw== X-Gm-Message-State: AOAM532/CG3PcDq6dgdNa97bwTl3r3BjO9Heis5iNxyVSJCQb1ruV9re A94GJwmvN22HGewT+QYRf4rJSWJtpmA= X-Google-Smtp-Source: ABdhPJxwMoBIZW/bbrMMaspHgiEXXqjo8MpvZEzK8Pwlq1eG4XN0Nz6oflJS9ThBBIS5pF+W02fkpg== X-Received: by 2002:a17:90b:3105:: with SMTP id gc5mr85211pjb.225.1599644926585; Wed, 09 Sep 2020 02:48:46 -0700 (PDT) Received: from sh05419pcu.spreadtrum.com ([117.18.48.82]) by smtp.gmail.com with ESMTPSA id u14sm2224149pfc.203.2020.09.09.02.48.43 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 09 Sep 2020 02:48:46 -0700 (PDT) From: Hongtao Wu To: Lorenzo Pieralisi , Rob Herring Cc: Orson Zhai , Baolin Wang , Chunyan Zhang , linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Hongtao Wu Subject: [PATCH v3 2/2] PCI: sprd: Add support for Unisoc SoCs' PCIe controller Date: Wed, 9 Sep 2020 17:48:32 +0800 Message-Id: <1599644912-29245-3-git-send-email-wuht06@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1599644912-29245-1-git-send-email-wuht06@gmail.com> References: <1599644912-29245-1-git-send-email-wuht06@gmail.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Hongtao Wu This series adds PCIe controller driver for Unisoc SoCs. This controller is based on DesignWare PCIe IP. Signed-off-by: Hongtao Wu --- drivers/pci/controller/dwc/Kconfig | 13 ++ drivers/pci/controller/dwc/Makefile | 1 + drivers/pci/controller/dwc/pcie-sprd.c | 231 +++++++++++++++++++++++++++++++++ 3 files changed, 245 insertions(+) create mode 100644 drivers/pci/controller/dwc/pcie-sprd.c -- 2.7.4 diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig index 044a376..0553010 100644 --- a/drivers/pci/controller/dwc/Kconfig +++ b/drivers/pci/controller/dwc/Kconfig @@ -311,4 +311,17 @@ config PCIE_AL required only for DT-based platforms. ACPI platforms with the Annapurna Labs PCIe controller don't need to enable this. + +config PCIE_SPRD + tristate "Unisoc PCIe controller - Host Mode" + depends on ARCH_SPRD || COMPILE_TEST + depends on PCI_MSI_IRQ_DOMAIN + select PCIE_DW_HOST + help + Unisoc PCIe controller uses the DesignWare core. It can be configured + as an Endpoint (EP) or a Root complex (RC). In order to enable host + mode (the controller works as RC), PCIE_SPRD must be selected. + Say Y or M here if you want to PCIe RC controller support on Unisoc + SoCs. + endmenu diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile index a751553..eb546e9 100644 --- a/drivers/pci/controller/dwc/Makefile +++ b/drivers/pci/controller/dwc/Makefile @@ -20,6 +20,7 @@ obj-$(CONFIG_PCI_MESON) += pci-meson.o obj-$(CONFIG_PCIE_TEGRA194) += pcie-tegra194.o obj-$(CONFIG_PCIE_UNIPHIER) += pcie-uniphier.o obj-$(CONFIG_PCIE_UNIPHIER_EP) += pcie-uniphier-ep.o +obj-$(CONFIG_PCIE_SPRD) += pcie-sprd.o # The following drivers are for devices that use the generic ACPI # pci_root.c driver but don't support standard ECAM config access. diff --git a/drivers/pci/controller/dwc/pcie-sprd.c b/drivers/pci/controller/dwc/pcie-sprd.c new file mode 100644 index 0000000..cec4f34 --- /dev/null +++ b/drivers/pci/controller/dwc/pcie-sprd.c @@ -0,0 +1,231 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PCIe host controller driver for Unisoc SoCs + * + * Copyright (C) 2020 Unisoc, Inc. + * + * Author: Hongtao Wu + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "pcie-designware.h" + +#define NUM_OF_ARGS 5 + +struct sprd_pcie { + struct dw_pcie pci; +}; + +static int sprd_pcie_syscon_setting(struct platform_device *pdev, char *env) +{ + struct device_node *np = pdev->dev.of_node; + int i, count, err; + u32 type, delay, reg, mask, val, tmp_val; + struct of_phandle_args out_args; + struct regmap *iomap; + struct device *dev = &pdev->dev; + + if (!of_find_property(np, env, NULL)) { + dev_info(dev, "There isn't property %s in dts\n", env); + return 0; + } + + count = of_property_count_elems_of_size(np, env, + (NUM_OF_ARGS + 1) * sizeof(u32)); + dev_info(dev, "Property (%s) reg count is %d :\n", env, count); + + for (i = 0; i < count; i++) { + err = of_parse_phandle_with_fixed_args(np, env, NUM_OF_ARGS, + i, &out_args); + if (err < 0) + return err; + + type = out_args.args[0]; + delay = out_args.args[1]; + reg = out_args.args[2]; + mask = out_args.args[3]; + val = out_args.args[4]; + + iomap = syscon_node_to_regmap(out_args.np); + + switch (type) { + case 0: + regmap_update_bits(iomap, reg, mask, val); + break; + + case 1: + regmap_read(iomap, reg, &tmp_val); + tmp_val &= (~mask); + tmp_val |= (val & mask); + regmap_write(iomap, reg, tmp_val); + break; + default: + break; + } + + if (delay) + usleep_range(delay, delay + 10); + + regmap_read(iomap, reg, &tmp_val); + dev_dbg(dev, + "%2d:reg[0x%8x] mask[0x%8x] val[0x%8x] result[0x%8x]\n", + i, reg, mask, val, tmp_val); + } + + return i; +} + +static int sprd_pcie_perst_assert(struct platform_device *pdev) +{ + return sprd_pcie_syscon_setting(pdev, "sprd,pcie-perst-assert"); +} + +static int sprd_pcie_perst_deassert(struct platform_device *pdev) +{ + return sprd_pcie_syscon_setting(pdev, "sprd,pcie-perst-deassert"); +} + +static int sprd_pcie_power_on(struct platform_device *pdev) +{ + int ret; + struct device *dev = &pdev->dev; + + ret = sprd_pcie_syscon_setting(pdev, "sprd,pcie-poweron-syscons"); + if (ret < 0) + dev_err(dev, + "failed to set pcie poweroff syscons, return %d\n", + ret); + + sprd_pcie_perst_deassert(pdev); + + return ret; +} + +static int sprd_pcie_power_off(struct platform_device *pdev) +{ + int ret; + struct device *dev = &pdev->dev; + + sprd_pcie_perst_assert(pdev); + + ret = sprd_pcie_syscon_setting(pdev, "sprd,pcie-poweroff-syscons"); + if (ret < 0) + dev_err(dev, + "failed to set pcie poweroff syscons, return %d\n", + ret); + + return ret; +} + +static int sprd_pcie_host_init(struct pcie_port *pp) +{ + int ret; + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + + dw_pcie_setup_rc(pp); + dw_pcie_msi_init(pp); + + ret = dw_pcie_wait_for_link(pci); + if (ret) + dev_err(pci->dev, "pcie ep may has not been powered on yet\n"); + + return ret; +} + +static const struct dw_pcie_host_ops sprd_pcie_host_ops = { + .host_init = sprd_pcie_host_init, +}; + +static int sprd_add_pcie_port(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct sprd_pcie *ctrl = platform_get_drvdata(pdev); + struct dw_pcie *pci = &ctrl->pci; + struct pcie_port *pp = &pci->pp; + + pci->dbi_base = devm_platform_ioremap_resource_byname(pdev, "dbi"); + if (IS_ERR(pci->dbi_base)) { + dev_err(dev, "failed to get rc dbi base\n"); + return PTR_ERR(pci->dbi_base); + } + + pp->ops = &sprd_pcie_host_ops; + + if (IS_ENABLED(CONFIG_PCI_MSI)) { + pp->msi_irq = platform_get_irq_byname(pdev, "msi"); + if (pp->msi_irq < 0) { + dev_err(dev, "failed to get msi, return %d\n", + pp->msi_irq); + return pp->msi_irq; + } + } + + return dw_pcie_host_init(pp); +} + +static int sprd_pcie_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct sprd_pcie *ctrl; + struct dw_pcie *pci; + int ret; + + ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL); + if (!ctrl) + return -ENOMEM; + + pci = &ctrl->pci; + pci->dev = dev; + + platform_set_drvdata(pdev, ctrl); + + ret = sprd_pcie_power_on(pdev); + if (ret < 0) { + dev_err(dev, "failed to get pcie poweron syscons, return %d\n", + ret); + goto err_power_off; + } + + ret = sprd_add_pcie_port(pdev); + if (ret) { + dev_warn(dev, "failed to initialize RC controller\n"); + return ret; + } + + return 0; + +err_power_off: + sprd_pcie_power_off(pdev); + + return ret; +} + +static const struct of_device_id sprd_pcie_of_match[] = { + { + .compatible = "sprd,pcie-rc", + }, + {}, +}; + +static struct platform_driver sprd_pcie_driver = { + .probe = sprd_pcie_probe, + .driver = { + .name = "sprd-pcie", + .of_match_table = sprd_pcie_of_match, + }, +}; + +module_platform_driver(sprd_pcie_driver); + +MODULE_DESCRIPTION("Unisoc PCIe host controller driver"); +MODULE_LICENSE("GPL v2");