From patchwork Mon Jan 18 09:17:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Xue X-Patchwork-Id: 12026935 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 599AEC43381 for ; Mon, 18 Jan 2021 10:46:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3B26322BEA for ; Mon, 18 Jan 2021 10:46:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388762AbhARKqM (ORCPT ); Mon, 18 Jan 2021 05:46:12 -0500 Received: from lucky1.263xmail.com ([211.157.147.134]:33436 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388870AbhARJc3 (ORCPT ); Mon, 18 Jan 2021 04:32:29 -0500 Received: from localhost (unknown [192.168.167.70]) by lucky1.263xmail.com (Postfix) with ESMTP id 5CDFEC591D; Mon, 18 Jan 2021 17:18:03 +0800 (CST) X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-ADDR-CHECKED4: 1 X-ANTISPAM-LEVEL: 2 X-ABS-CHECKED: 0 Received: from xxm-vm.localdomain (unknown [58.22.7.114]) by smtp.263.net (postfix) whith ESMTP id P13518T140326291363584S1610961461018109_; Mon, 18 Jan 2021 17:18:03 +0800 (CST) X-IP-DOMAINF: 1 X-UNIQUE-TAG: <12b7956a9424351bb479c9cddd68f818> X-RL-SENDER: xxm@rock-chips.com X-SENDER: xxm@rock-chips.com X-LOGIN-NAME: xxm@rock-chips.com X-FST-TO: bhelgaas@google.com X-SENDER-IP: 58.22.7.114 X-ATTACHMENT-NUM: 0 X-System-Flag: 0 From: Simon Xue To: Bjorn Helgaas , Lorenzo Pieralisi Cc: linux-pci@vger.kernel.org, linux-rockchip@lists.infradead.org, Simon Xue , Shawn Lin Subject: [PATCH 3/3] PCI: rockchip: add DesignWare based PCIe controller Date: Mon, 18 Jan 2021 17:17:39 +0800 Message-Id: <20210118091739.247040-3-xxm@rock-chips.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210118091739.247040-1-xxm@rock-chips.com> References: <20210118091739.247040-1-xxm@rock-chips.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org pcie-dw-rockchip is based on DWC IP. But pcie-rockchip-host is another IP which is only used for RK3399. So all the following non-RK3399 SoCs should use this driver. Signed-off-by: Simon Xue Signed-off-by: Shawn Lin --- drivers/pci/controller/Kconfig | 4 +- drivers/pci/controller/dwc/Kconfig | 9 + drivers/pci/controller/dwc/Makefile | 1 + drivers/pci/controller/dwc/pcie-dw-rockchip.c | 454 ++++++++++++++++++ 4 files changed, 466 insertions(+), 2 deletions(-) create mode 100644 drivers/pci/controller/dwc/pcie-dw-rockchip.c diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig index 64e2f5e379aa..48a7d62f97f3 100644 --- a/drivers/pci/controller/Kconfig +++ b/drivers/pci/controller/Kconfig @@ -219,7 +219,7 @@ config PCIE_ROCKCHIP_HOST help Say Y here if you want internal PCI support on Rockchip SoC. There is 1 internal PCIe port available to support GEN2 with - 4 slots. + 4 slots. Only for RK3399. config PCIE_ROCKCHIP_EP bool "Rockchip PCIe endpoint controller" @@ -231,7 +231,7 @@ config PCIE_ROCKCHIP_EP help Say Y here if you want to support Rockchip PCIe controller in endpoint mode on Rockchip SoC. There is 1 internal PCIe port - available to support GEN2 with 4 slots. + available to support GEN2 with 4 slots. Only for RK3399. config PCIE_MEDIATEK tristate "MediaTek PCIe controller" diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig index 22c5529e9a65..110733d0c241 100644 --- a/drivers/pci/controller/dwc/Kconfig +++ b/drivers/pci/controller/dwc/Kconfig @@ -214,6 +214,15 @@ config PCIE_ARTPEC6_EP Enables support for the PCIe controller in the ARTPEC-6 SoC to work in endpoint mode. This uses the DesignWare core. +config PCIE_DW_ROCKCHIP_HOST + bool "Rockchip DesignWare PCIe controller" + select PCIE_DW + select PCIE_DW_HOST + depends on ARCH_ROCKCHIP + depends on OF + help + Enables support for the DW PCIe controller in the Rockchip SoC. + config PCIE_INTEL_GW bool "Intel Gateway PCIe host controller support" depends on OF && (X86 || COMPILE_TEST) diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile index a751553fa0db..9c7048d2be17 100644 --- a/drivers/pci/controller/dwc/Makefile +++ b/drivers/pci/controller/dwc/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_PCI_LAYERSCAPE_EP) += pci-layerscape-ep.o obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o +obj-$(CONFIG_PCIE_DW_ROCKCHIP_HOST) += pcie-dw-rockchip.o obj-$(CONFIG_PCIE_INTEL_GW) += pcie-intel-gw.o obj-$(CONFIG_PCIE_KIRIN) += pcie-kirin.o obj-$(CONFIG_PCIE_HISI_STB) += pcie-histb.o diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c new file mode 100644 index 000000000000..5997fbc675d3 --- /dev/null +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c @@ -0,0 +1,454 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PCIe host controller driver for Rockchip SoCs + * + * Copyright (C) 2021 Rockchip Electronics Co., Ltd. + * http://www.rock-chips.com + * + * Author: Simon Xue + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "pcie-designware.h" + +/* + * The upper 16 bits of PCIE_CLIENT_CONFIG are a write + * mask for the lower 16 bits. This allows atomic updates + * of the register without locking. + */ +#define HIWORD_UPDATE(mask, val) (((mask) << 16) | (val)) +#define HIWORD_UPDATE_BIT(val) HIWORD_UPDATE(val, val) + +#define to_rockchip_pcie(x) dev_get_drvdata((x)->dev) + +#define PCIE_CLIENT_RC_MODE HIWORD_UPDATE_BIT(0x40) +#define PCIE_CLIENT_ENABLE_LTSSM HIWORD_UPDATE_BIT(0xc) +#define PCIE_SMLH_LINKUP BIT(16) +#define PCIE_RDLH_LINKUP BIT(17) +#define PCIE_L0S_ENTRY 0x11 +#define PCIE_CLIENT_GENERAL_CONTROL 0x0 +#define PCIE_CLIENT_GENERAL_DEBUG 0x104 +#define PCIE_CLIENT_HOT_RESET_CTRL 0x180 +#define PCIE_CLIENT_LTSSM_STATUS 0x300 +#define PCIE_CLIENT_DBG_FIFO_MODE_CON 0x310 +#define PCIE_CLIENT_DBG_FIFO_PTN_HIT_D0 0x320 +#define PCIE_CLIENT_DBG_FIFO_PTN_HIT_D1 0x324 +#define PCIE_CLIENT_DBG_FIFO_TRN_HIT_D0 0x328 +#define PCIE_CLIENT_DBG_FIFO_TRN_HIT_D1 0x32c +#define PCIE_CLIENT_DBG_FIFO_STATUS 0x350 +#define PCIE_CLIENT_DBG_TRANSITION_DATA 0xffff0000 +#define PCIE_CLIENT_DBF_EN 0xffff0003 +#define PCIE_LTSSM_ENABLE_ENHANCE BIT(4) + +struct reset_bulk_data { + const char *id; + struct reset_control *rst; +}; + +struct rockchip_pcie { + struct dw_pcie *pci; + void __iomem *dbi_base; + void __iomem *apb_base; + struct phy *phy; + struct clk_bulk_data *clks; + unsigned int clk_cnt; + struct reset_bulk_data *rsts; + struct gpio_desc *rst_gpio; + struct pcie_port pp; + struct regulator *vpcie3v3; +}; + +static inline int rockchip_pcie_readl_apb(struct rockchip_pcie *rockchip, + u32 reg) +{ + return readl(rockchip->apb_base + reg); +} + +static inline void rockchip_pcie_writel_apb(struct rockchip_pcie *rockchip, + u32 reg, u32 val) +{ + writel(val, rockchip->apb_base + reg); +} + +static inline void rockchip_pcie_set_mode(struct rockchip_pcie *rockchip) +{ + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_GENERAL_CONTROL, + PCIE_CLIENT_RC_MODE); +} + +static inline void rockchip_pcie_enable_ltssm(struct rockchip_pcie *rockchip) +{ + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_GENERAL_CONTROL, + PCIE_CLIENT_ENABLE_LTSSM); +} + +static int rockchip_pcie_link_up(struct dw_pcie *pci) +{ + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci); + u32 val = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_LTSSM_STATUS); + + if ((val & (PCIE_RDLH_LINKUP | PCIE_SMLH_LINKUP)) == 0x30000 && + (val & GENMASK(5, 0)) == PCIE_L0S_ENTRY) + return 1; + + return 0; +} + +static void rockchip_pcie_establish_link(struct dw_pcie *pci) +{ + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci); + + if (dw_pcie_link_up(pci)) { + dev_err(pci->dev, "link already up\n"); + return; + } + + /* Reset device */ + gpiod_set_value_cansleep(rockchip->rst_gpio, 0); + msleep(100); + gpiod_set_value_cansleep(rockchip->rst_gpio, 1); + + rockchip_pcie_enable_ltssm(rockchip); +} + +static void rockchip_pcie_enable_debug(struct rockchip_pcie *rockchip) +{ + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_DBG_FIFO_PTN_HIT_D0, + PCIE_CLIENT_DBG_TRANSITION_DATA); + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_DBG_FIFO_PTN_HIT_D1, + PCIE_CLIENT_DBG_TRANSITION_DATA); + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_DBG_FIFO_TRN_HIT_D0, + PCIE_CLIENT_DBG_TRANSITION_DATA); + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_DBG_FIFO_TRN_HIT_D1, + PCIE_CLIENT_DBG_TRANSITION_DATA); + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_DBG_FIFO_MODE_CON, + PCIE_CLIENT_DBF_EN); +} + +static void rockchip_pcie_debug_dump(struct rockchip_pcie *rockchip) +{ + u32 loop; + struct dw_pcie *pci = rockchip->pci; + + dev_dbg(pci->dev, "ltssm = 0x%x\n", + rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_LTSSM_STATUS)); + for (loop = 0; loop < 64; loop++) + dev_dbg(pci->dev, "fifo_status = 0x%x\n", + rockchip_pcie_readl_apb(rockchip, + PCIE_CLIENT_DBG_FIFO_STATUS)); +} + +static int rockchip_pcie_host_init(struct pcie_port *pp) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci); + + dw_pcie_setup_rc(pp); + + rockchip_pcie_enable_debug(rockchip); + + rockchip_pcie_establish_link(pci); + dw_pcie_wait_for_link(pci); + + rockchip_pcie_debug_dump(rockchip); + + return 0; +} + +static const struct dw_pcie_host_ops rockchip_pcie_host_ops = { + .host_init = rockchip_pcie_host_init, +}; + +static int rockchip_add_pcie_port(struct rockchip_pcie *rockchip) +{ + int ret; + struct dw_pcie *pci = rockchip->pci; + struct pcie_port *pp = &pci->pp; + struct device *dev = pci->dev; + + pp->ops = &rockchip_pcie_host_ops; + + if (device_property_read_bool(dev, "msi-map")) + pp->msi_ext = 1; + + rockchip_pcie_set_mode(rockchip); + + ret = dw_pcie_host_init(pp); + if (ret) + return ret; + + return 0; +} + +static void rockchip_pcie_clk_deinit(struct rockchip_pcie *rockchip) +{ + clk_bulk_disable(rockchip->clk_cnt, rockchip->clks); + clk_bulk_unprepare(rockchip->clk_cnt, rockchip->clks); +} + +static int rockchip_pcie_clk_init(struct rockchip_pcie *rockchip) +{ + struct device *dev = rockchip->pci->dev; + struct property *prop; + const char *name; + int i = 0, ret, count; + + count = of_property_count_strings(dev->of_node, "clock-names"); + if (count < 1) + return -ENODEV; + + rockchip->clks = devm_kcalloc(dev, count, + sizeof(struct clk_bulk_data), + GFP_KERNEL); + if (!rockchip->clks) + return -ENOMEM; + + rockchip->clk_cnt = count; + + of_property_for_each_string(dev->of_node, "clock-names", + prop, name) { + rockchip->clks[i].id = name; + if (!rockchip->clks[i].id) + return -ENOMEM; + i++; + } + + ret = devm_clk_bulk_get(dev, count, rockchip->clks); + if (ret) + return ret; + + ret = clk_bulk_prepare(count, rockchip->clks); + if (ret) + return ret; + + ret = clk_bulk_enable(count, rockchip->clks); + if (ret) { + clk_bulk_unprepare(count, rockchip->clks); + return ret; + } + + return 0; +} + +static int rockchip_pcie_resource_get(struct platform_device *pdev, + struct rockchip_pcie *rockchip) +{ + struct resource *dbi_base; + struct resource *apb_base; + + dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "pcie-dbi"); + if (!dbi_base) + return -ENODEV; + + rockchip->dbi_base = devm_ioremap_resource(&pdev->dev, dbi_base); + if (IS_ERR(rockchip->dbi_base)) + return PTR_ERR(rockchip->dbi_base); + + rockchip->pci->dbi_base = rockchip->dbi_base; + + apb_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "pcie-apb"); + if (!apb_base) + return -ENODEV; + + rockchip->apb_base = devm_ioremap_resource(&pdev->dev, apb_base); + if (IS_ERR(rockchip->apb_base)) + return PTR_ERR(rockchip->apb_base); + + rockchip->rst_gpio = devm_gpiod_get_optional(&pdev->dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(rockchip->rst_gpio)) + return PTR_ERR(rockchip->rst_gpio); + + return 0; +} + +static int rockchip_pcie_phy_init(struct rockchip_pcie *rockchip) +{ + int ret; + struct device *dev = rockchip->pci->dev; + + rockchip->phy = devm_phy_get(dev, "pcie-phy"); + if (IS_ERR(rockchip->phy)) { + if (PTR_ERR(rockchip->phy) != -EPROBE_DEFER) + dev_info(dev, "missing phy\n"); + return PTR_ERR(rockchip->phy); + } + + ret = phy_init(rockchip->phy); + if (ret < 0) + return ret; + + phy_power_on(rockchip->phy); + + return 0; +} + +static void rockchip_pcie_phy_deinit(struct rockchip_pcie *rockchip) +{ + phy_exit(rockchip->phy); + phy_power_off(rockchip->phy); +} + +static int rockchip_pcie_reset_control_release(struct rockchip_pcie *rockchip) +{ + struct device *dev = rockchip->pci->dev; + struct property *prop; + const char *name; + int ret, count, i = 0; + + count = of_property_count_strings(dev->of_node, "reset-names"); + if (count < 1) + return -ENODEV; + + rockchip->rsts = devm_kcalloc(dev, count, + sizeof(struct reset_bulk_data), + GFP_KERNEL); + if (!rockchip->rsts) + return -ENOMEM; + + of_property_for_each_string(dev->of_node, "reset-names", + prop, name) { + rockchip->rsts[i].id = name; + if (!rockchip->rsts[i].id) + return -ENOMEM; + i++; + } + + for (i = 0; i < count; i++) { + rockchip->rsts[i].rst = devm_reset_control_get_exclusive(dev, + rockchip->rsts[i].id); + if (IS_ERR(rockchip->rsts[i].rst)) { + dev_err(dev, "failed to get %s\n", + rockchip->clks[i].id); + return PTR_ERR(rockchip->rsts[i].rst); + } + } + + for (i = 0; i < count; i++) { + ret = reset_control_deassert(rockchip->rsts[i].rst); + if (ret) { + dev_err(dev, "failed to release %s\n", + rockchip->rsts[i].id); + return ret; + } + } + + return 0; +} + +static void rockchip_pcie_fast_link_setup(struct rockchip_pcie *rockchip) +{ + u32 val; + + /* LTSSM EN ctrl mode */ + val = rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_HOT_RESET_CTRL); + val |= PCIE_LTSSM_ENABLE_ENHANCE | (PCIE_LTSSM_ENABLE_ENHANCE << 16); + rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_HOT_RESET_CTRL, val); +} + + +static const struct of_device_id rockchip_pcie_of_match[] = { + { .compatible = "rockchip,rk3568-pcie", }, + { /* sentinel */ }, +}; + +static const struct dw_pcie_ops dw_pcie_ops = { + .link_up = rockchip_pcie_link_up, +}; + +static int rockchip_pcie_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rockchip_pcie *rockchip; + struct dw_pcie *pci; + int ret; + + rockchip = devm_kzalloc(dev, sizeof(*rockchip), GFP_KERNEL); + if (!rockchip) + return -ENOMEM; + + pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); + if (!pci) + return -ENOMEM; + + pci->dev = dev; + pci->ops = &dw_pcie_ops; + + rockchip->pci = pci; + + ret = rockchip_pcie_resource_get(pdev, rockchip); + if (ret) + return ret; + + /* DON'T MOVE ME: must be enable before phy init */ + rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3"); + if (IS_ERR(rockchip->vpcie3v3)) { + if (PTR_ERR(rockchip->vpcie3v3) != -ENODEV) + return PTR_ERR(rockchip->vpcie3v3); + dev_info(dev, "no vpcie3v3 regulator found\n"); + } + + if (!IS_ERR(rockchip->vpcie3v3)) { + ret = regulator_enable(rockchip->vpcie3v3); + if (ret) { + dev_err(pci->dev, "fail to enable vpcie3v3 regulator\n"); + return ret; + } + } + + ret = rockchip_pcie_phy_init(rockchip); + if (ret) + goto disable_regulator; + + ret = rockchip_pcie_reset_control_release(rockchip); + if (ret) + goto deinit_phy; + + ret = rockchip_pcie_clk_init(rockchip); + if (ret) + goto deinit_phy; + + rockchip_pcie_fast_link_setup(rockchip); + + platform_set_drvdata(pdev, rockchip); + + ret = rockchip_add_pcie_port(rockchip); + if (ret) + goto deinit_clk; + + return 0; + +deinit_clk: + rockchip_pcie_clk_deinit(rockchip); +deinit_phy: + rockchip_pcie_phy_deinit(rockchip); +disable_regulator: + if (!IS_ERR(rockchip->vpcie3v3)) + regulator_disable(rockchip->vpcie3v3); + + return ret; +} + +MODULE_DEVICE_TABLE(of, rockchip_pcie_of_match); + +static struct platform_driver rockchip_pcie_driver = { + .driver = { + .name = "rk-pcie", + .of_match_table = rockchip_pcie_of_match, + .suppress_bind_attrs = true, + }, + .probe = rockchip_pcie_probe, +}; + +builtin_platform_driver(rockchip_pcie_driver);