From patchwork Mon Oct 26 11:35:48 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhou Wang X-Patchwork-Id: 7487241 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 433ECBEEA4 for ; Mon, 26 Oct 2015 11:22:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D44BE207E2 for ; Mon, 26 Oct 2015 11:22:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9CF3B2068C for ; Mon, 26 Oct 2015 11:22:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932125AbbJZLV7 (ORCPT ); Mon, 26 Oct 2015 07:21:59 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:14740 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753488AbbJZLUv (ORCPT ); Mon, 26 Oct 2015 07:20:51 -0400 Received: from 172.24.1.48 (EHLO SZXEML424-HUB.china.huawei.com) ([172.24.1.48]) by szxrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CVB57301; Mon, 26 Oct 2015 19:20:37 +0800 (CST) Received: from localhost.localdomain (10.67.212.75) by SZXEML424-HUB.china.huawei.com (10.82.67.153) with Microsoft SMTP Server id 14.3.235.1; Mon, 26 Oct 2015 19:20:25 +0800 From: Zhou Wang To: Bjorn Helgaas , , , Arnd Bergmann , , , , , , , , , , CC: , , , , , , , , , , Zhou Wang Subject: [PATCH v12 6/8] PCI: hisi: Add PCIe host support for HiSilicon SoC Hip05 Date: Mon, 26 Oct 2015 19:35:48 +0800 Message-ID: <1445859350-26375-7-git-send-email-wangzhou1@hisilicon.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1445859350-26375-1-git-send-email-wangzhou1@hisilicon.com> References: <1445859350-26375-1-git-send-email-wangzhou1@hisilicon.com> MIME-Version: 1.0 X-Originating-IP: [10.67.212.75] X-CFilter-Loop: Reflected Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds PCIe host support for HiSilicon SoC Hip05. Signed-off-by: Zhou Wang Signed-off-by: Gabriele Paoloni Signed-off-by: liudongdong --- drivers/pci/host/Kconfig | 8 ++ drivers/pci/host/Makefile | 1 + drivers/pci/host/pcie-hisi.c | 198 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 207 insertions(+) create mode 100644 drivers/pci/host/pcie-hisi.c diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig index d5e58ba..ae873be 100644 --- a/drivers/pci/host/Kconfig +++ b/drivers/pci/host/Kconfig @@ -145,4 +145,12 @@ config PCIE_IPROC_BCMA Say Y here if you want to use the Broadcom iProc PCIe controller through the BCMA bus interface +config PCI_HISI + depends on OF && ARM64 + bool "HiSilicon SoC HIP05 PCIe controller" + select PCIEPORTBUS + select PCIE_DW + help + Say Y here if you want PCIe controller support on HiSilicon HIP05 SoC + endmenu diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile index 140d66f..ea1dbf2 100644 --- a/drivers/pci/host/Makefile +++ b/drivers/pci/host/Makefile @@ -17,3 +17,4 @@ obj-$(CONFIG_PCI_VERSATILE) += pci-versatile.o obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o obj-$(CONFIG_PCIE_IPROC_PLATFORM) += pcie-iproc-platform.o obj-$(CONFIG_PCIE_IPROC_BCMA) += pcie-iproc-bcma.o +obj-$(CONFIG_PCI_HISI) += pcie-hisi.o diff --git a/drivers/pci/host/pcie-hisi.c b/drivers/pci/host/pcie-hisi.c new file mode 100644 index 0000000..545d4e7 --- /dev/null +++ b/drivers/pci/host/pcie-hisi.c @@ -0,0 +1,198 @@ +/* + * PCIe host controller driver for HiSilicon Hip05 SoC + * + * Copyright (C) 2015 HiSilicon Co., Ltd. http://www.hisilicon.com + * + * Author: Zhou Wang + * Dacai Zhu + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include +#include +#include +#include +#include +#include +#include + +#include "pcie-designware.h" + +#define PCIE_SUBCTRL_SYS_STATE4_REG 0x6818 +#define PCIE_LTSSM_LINKUP_STATE 0x11 +#define PCIE_LTSSM_STATE_MASK 0x3F + +#define to_hisi_pcie(x) container_of(x, struct hisi_pcie, pp) + +struct hisi_pcie { + struct regmap *subctrl; + void __iomem *reg_base; + u32 port_id; + struct pcie_port pp; +}; + +static inline void hisi_pcie_apb_writel(struct hisi_pcie *pcie, + u32 val, u32 reg) +{ + writel(val, pcie->reg_base + reg); +} + +static inline u32 hisi_pcie_apb_readl(struct hisi_pcie *pcie, u32 reg) +{ + return readl(pcie->reg_base + reg); +} + +/* Hip05 PCIe host only supports 32-bit config access */ +static int hisi_pcie_cfg_read(struct pcie_port *pp, int where, int size, + u32 *val) +{ + u32 reg; + u32 reg_val; + struct hisi_pcie *pcie = to_hisi_pcie(pp); + void *walker = ®_val; + + walker += (where & 0x3); + reg = where & ~0x3; + reg_val = hisi_pcie_apb_readl(pcie, reg); + + if (size == 1) + *val = *(u8 __force *) walker; + else if (size == 2) + *val = *(u16 __force *) walker; + else if (size != 4) + return PCIBIOS_BAD_REGISTER_NUMBER; + + return PCIBIOS_SUCCESSFUL; +} + +/* Hip05 PCIe host only supports 32-bit config access */ +static int hisi_pcie_cfg_write(struct pcie_port *pp, int where, int size, + u32 val) +{ + u32 reg_val; + u32 reg; + struct hisi_pcie *pcie = to_hisi_pcie(pp); + void *walker = ®_val; + + walker += (where & 0x3); + reg = where & ~0x3; + if (size == 4) + hisi_pcie_apb_writel(pcie, val, reg); + else if (size == 2) { + reg_val = hisi_pcie_apb_readl(pcie, reg); + *(u16 __force *) walker = val; + hisi_pcie_apb_writel(pcie, reg_val, reg); + } else if (size == 1) { + reg_val = hisi_pcie_apb_readl(pcie, reg); + *(u8 __force *) walker = val; + hisi_pcie_apb_writel(pcie, reg_val, reg); + } else + return PCIBIOS_BAD_REGISTER_NUMBER; + + return PCIBIOS_SUCCESSFUL; +} + +static int hisi_pcie_link_up(struct pcie_port *pp) +{ + u32 val; + struct hisi_pcie *hisi_pcie = to_hisi_pcie(pp); + + regmap_read(hisi_pcie->subctrl, PCIE_SUBCTRL_SYS_STATE4_REG + + 0x100 * hisi_pcie->port_id, &val); + + return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE); +} + +static struct pcie_host_ops hisi_pcie_host_ops = { + .rd_own_conf = hisi_pcie_cfg_read, + .wr_own_conf = hisi_pcie_cfg_write, + .link_up = hisi_pcie_link_up, +}; + +static int __init hisi_add_pcie_port(struct pcie_port *pp, + struct platform_device *pdev) +{ + int ret; + u32 port_id; + struct hisi_pcie *hisi_pcie = to_hisi_pcie(pp); + + if (of_property_read_u32(pdev->dev.of_node, "port-id", &port_id)) { + dev_err(&pdev->dev, "failed to read port-id\n"); + return -EINVAL; + } + if (port_id > 3) { + dev_err(&pdev->dev, "Invalid port-id: %d\n", port_id); + return -EINVAL; + } + hisi_pcie->port_id = port_id; + + pp->ops = &hisi_pcie_host_ops; + + ret = dw_pcie_host_init(pp); + if (ret) { + dev_err(&pdev->dev, "failed to initialize host\n"); + return ret; + } + + return 0; +} + +static int __init hisi_pcie_probe(struct platform_device *pdev) +{ + struct hisi_pcie *hisi_pcie; + struct pcie_port *pp; + struct resource *reg; + int ret; + + hisi_pcie = devm_kzalloc(&pdev->dev, sizeof(*hisi_pcie), GFP_KERNEL); + if (!hisi_pcie) + return -ENOMEM; + + pp = &hisi_pcie->pp; + pp->dev = &pdev->dev; + + hisi_pcie->subctrl = + syscon_regmap_lookup_by_compatible("hisilicon,pcie-sas-subctrl"); + if (IS_ERR(hisi_pcie->subctrl)) { + dev_err(pp->dev, "cannot get subctrl base\n"); + return PTR_ERR(hisi_pcie->subctrl); + } + + reg = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc_dbi"); + hisi_pcie->reg_base = devm_ioremap_resource(&pdev->dev, reg); + if (IS_ERR(hisi_pcie->reg_base)) { + dev_err(pp->dev, "cannot get rc_dbi base\n"); + return PTR_ERR(hisi_pcie->reg_base); + } + + hisi_pcie->pp.dbi_base = hisi_pcie->reg_base; + + ret = hisi_add_pcie_port(pp, pdev); + if (ret) + return ret; + + platform_set_drvdata(pdev, hisi_pcie); + + dev_warn(pp->dev, "Hip05 PCIe host only supports 32-bit config access of host\n"); + + return 0; +} + +static const struct of_device_id hisi_pcie_of_match[] = { + {.compatible = "hisilicon,hip05-pcie",}, + {}, +}; + +MODULE_DEVICE_TABLE(of, hisi_pcie_of_match); + +static struct platform_driver hisi_pcie_driver = { + .probe = hisi_pcie_probe, + .driver = { + .name = "hisi-pcie", + .of_match_table = hisi_pcie_of_match, + }, +}; + +module_platform_driver(hisi_pcie_driver);