From patchwork Tue Jul 6 12:23:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 12360479 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=-20.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 6B37BC07E9C for ; Tue, 6 Jul 2021 12:39:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 524BF622EB for ; Tue, 6 Jul 2021 12:39:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236818AbhGFMlo (ORCPT ); Tue, 6 Jul 2021 08:41:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:45064 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242163AbhGFMZt (ORCPT ); Tue, 6 Jul 2021 08:25:49 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5FE6361D7D; Tue, 6 Jul 2021 12:23:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625574190; bh=sxopU2xgf9gCq7iJzt2WMieum1/6JUWxcZVX6F7baPw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=a02fXnLfitY/PD24h7ApCso3GR7xINTIctPiTZBeeJ7+6qv/4LvmPfMuCbUhkIfuC NfIiHRm6VxilKm8PkOmP/cqzpI+qn+rpEP9sDn7LtPyeWeberCRsLNJnfKXnW1Mrw9 2jsboSwg6vM6/M7VApP2QIPmVBhPmqCcMXtJKJ5HSPDJUqFX8+3NPnjKdt1B8C1QCJ F2k9uxoMOeNe3pa8iQqX9WRPpyvaDVOSd0bWlEbtI7OMugj1zY7Hek3w5/Lafs+Rwu 9nX7fu5ukvMj6mHB2NWG+rcs4I1KS+Ps2PyAxRjIfxsIuRDlvdY7gmHKbhP+Dg+TZy XPyKVIEZd3Xuw== Received: by mail.kernel.org with local (Exim 4.94.2) (envelope-from ) id 1m0k6W-004qMn-79; Tue, 06 Jul 2021 14:23:08 +0200 From: Mauro Carvalho Chehab To: Rob Herring Cc: linuxarm@huawei.com, mauro.chehab@huawei.com, Mauro Carvalho Chehab , =?utf-8?q?Krzysztof_Wilc?= =?utf-8?q?zy=C5=84ski?= , Binghui Wang , Bjorn Helgaas , Kishon Vijay Abraham I , Lorenzo Pieralisi , Rob Herring , Vinod Koul , Wei Xu , Xiaowei Song , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-phy@lists.infradead.org Subject: [PATCH RFC 1/1] PCI: dwc: pcie-kirin: split PHY interface from the driver Date: Tue, 6 Jul 2021 14:23:06 +0200 Message-Id: <1977d79f3fa13f86c16167e44e98bf701fbaea0a.1625573452.git.mchehab+huawei@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 Sender: Mauro Carvalho Chehab Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The pcie-kirin PCIe driver contains internally a PHY interface for a Hikey 960. As we'll be adding support also for Hikey 970, we need to first split the PHY into a separate driver. Signed-off-by: Mauro Carvalho Chehab --- arch/arm64/boot/dts/hisilicon/hi3660.dtsi | 24 +- drivers/pci/controller/dwc/pcie-kirin.c | 195 +++------------- drivers/phy/hisilicon/Kconfig | 10 + drivers/phy/hisilicon/Makefile | 1 + drivers/phy/hisilicon/phy-hi3660-pcie.c | 261 ++++++++++++++++++++++ 5 files changed, 321 insertions(+), 170 deletions(-) create mode 100644 drivers/phy/hisilicon/phy-hi3660-pcie.c diff --git a/arch/arm64/boot/dts/hisilicon/hi3660.dtsi b/arch/arm64/boot/dts/hisilicon/hi3660.dtsi index 53890e8052a7..3a589fa4ca81 100644 --- a/arch/arm64/boot/dts/hisilicon/hi3660.dtsi +++ b/arch/arm64/boot/dts/hisilicon/hi3660.dtsi @@ -1001,17 +1001,28 @@ spi3: spi@ff3b3000 { status = "disabled"; }; + pcie_phy: pcie-phy@f3f2000 { + compatible = "hisilicon,hi960-pcie-phy"; + reg = <0x0 0xf3f20000 0x0 0x40000>; + reg-names = "phy"; + clocks = <&crg_ctrl HI3660_PCIEPHY_REF>, + <&crg_ctrl HI3660_PCLK_GATE_PCIE_PHY>; + clock-names = "pcie_phy_ref", "pcie_apb_phy"; + reset-gpios = <&gpio11 1 0 >; + #phy-cells = <0>; + }; + pcie@f4000000 { compatible = "hisilicon,kirin960-pcie"; reg = <0x0 0xf4000000 0x0 0x1000>, <0x0 0xff3fe000 0x0 0x1000>, - <0x0 0xf3f20000 0x0 0x40000>, <0x0 0xf5000000 0x0 0x2000>; - reg-names = "dbi", "apb", "phy", "config"; + reg-names = "dbi", "apb", "config"; bus-range = <0x0 0x1>; #address-cells = <3>; #size-cells = <2>; device_type = "pci"; + phys = <&pcie_phy>; ranges = <0x02000000 0x0 0x00000000 0x0 0xf6000000 0x0 0x02000000>; @@ -1028,15 +1039,10 @@ &gic GIC_SPI 283 IRQ_TYPE_LEVEL_HIGH>, &gic GIC_SPI 284 IRQ_TYPE_LEVEL_HIGH>, <0x0 0 0 4 &gic GIC_SPI 285 IRQ_TYPE_LEVEL_HIGH>; - clocks = <&crg_ctrl HI3660_PCIEPHY_REF>, - <&crg_ctrl HI3660_CLK_GATE_PCIEAUX>, - <&crg_ctrl HI3660_PCLK_GATE_PCIE_PHY>, + clocks = <&crg_ctrl HI3660_CLK_GATE_PCIEAUX>, <&crg_ctrl HI3660_PCLK_GATE_PCIE_SYS>, <&crg_ctrl HI3660_ACLK_GATE_PCIE>; - clock-names = "pcie_phy_ref", "pcie_aux", - "pcie_apb_phy", "pcie_apb_sys", - "pcie_aclk"; - reset-gpios = <&gpio11 1 0 >; + clock-names = "pcie_aux", "pcie_apb_sys", "pcie_aclk"; }; /* UFS */ diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c index 026fd1e42a55..f906211a0bca 100644 --- a/drivers/pci/controller/dwc/pcie-kirin.c +++ b/drivers/pci/controller/dwc/pcie-kirin.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include #include @@ -28,26 +29,17 @@ #define to_kirin_pcie(x) dev_get_drvdata((x)->dev) -#define REF_CLK_FREQ 100000000 - /* PCIe ELBI registers */ #define SOC_PCIECTRL_CTRL0_ADDR 0x000 #define SOC_PCIECTRL_CTRL1_ADDR 0x004 -#define SOC_PCIEPHY_CTRL2_ADDR 0x008 -#define SOC_PCIEPHY_CTRL3_ADDR 0x00c #define PCIE_ELBI_SLV_DBI_ENABLE (0x1 << 21) /* info located in APB */ #define PCIE_APP_LTSSM_ENABLE 0x01c -#define PCIE_APB_PHY_CTRL0 0x0 -#define PCIE_APB_PHY_CTRL1 0x4 #define PCIE_APB_PHY_STATUS0 0x400 #define PCIE_LINKUP_ENABLE (0x8020) #define PCIE_LTSSM_ENABLE_BIT (0x1 << 11) #define PIPE_CLK_STABLE (0x1 << 19) -#define PHY_REF_PAD_BIT (0x1 << 8) -#define PHY_PWR_DOWN_BIT (0x1 << 22) -#define PHY_RST_ACK_BIT (0x1 << 16) /* info located in sysctrl */ #define SCTRL_PCIE_CMOS_OFFSET 0x60 @@ -60,36 +52,13 @@ #define PCIE_DEBOUNCE_PARAM 0xF0F400 #define PCIE_OE_BYPASS (0x3 << 28) -/* peri_crg ctrl */ -#define CRGCTRL_PCIE_ASSERT_OFFSET 0x88 -#define CRGCTRL_PCIE_ASSERT_BIT 0x8c000000 - -/* Time for delay */ -#define REF_2_PERST_MIN 20000 -#define REF_2_PERST_MAX 25000 -#define PERST_2_ACCESS_MIN 10000 -#define PERST_2_ACCESS_MAX 12000 -#define LINK_WAIT_MIN 900 -#define LINK_WAIT_MAX 1000 -#define PIPE_CLK_WAIT_MIN 550 -#define PIPE_CLK_WAIT_MAX 600 -#define TIME_CMOS_MIN 100 -#define TIME_CMOS_MAX 105 -#define TIME_PHY_PD_MIN 10 -#define TIME_PHY_PD_MAX 11 - struct kirin_pcie { struct dw_pcie *pci; + struct phy *phy; void __iomem *apb_base; - void __iomem *phy_base; - struct regmap *crgctrl; - struct regmap *sysctrl; struct clk *apb_sys_clk; - struct clk *apb_phy_clk; - struct clk *phy_ref_clk; struct clk *pcie_aclk; struct clk *pcie_aux_clk; - int gpio_id_reset; }; /* Registers in PCIeCTRL */ @@ -104,35 +73,15 @@ static inline u32 kirin_apb_ctrl_readl(struct kirin_pcie *kirin_pcie, u32 reg) return readl(kirin_pcie->apb_base + reg); } -/* Registers in PCIePHY */ -static inline void kirin_apb_phy_writel(struct kirin_pcie *kirin_pcie, - u32 val, u32 reg) -{ - writel(val, kirin_pcie->phy_base + reg); -} - -static inline u32 kirin_apb_phy_readl(struct kirin_pcie *kirin_pcie, u32 reg) -{ - return readl(kirin_pcie->phy_base + reg); -} - static long kirin_pcie_get_clk(struct kirin_pcie *kirin_pcie, struct platform_device *pdev) { struct device *dev = &pdev->dev; - kirin_pcie->phy_ref_clk = devm_clk_get(dev, "pcie_phy_ref"); - if (IS_ERR(kirin_pcie->phy_ref_clk)) - return PTR_ERR(kirin_pcie->phy_ref_clk); - kirin_pcie->pcie_aux_clk = devm_clk_get(dev, "pcie_aux"); if (IS_ERR(kirin_pcie->pcie_aux_clk)) return PTR_ERR(kirin_pcie->pcie_aux_clk); - kirin_pcie->apb_phy_clk = devm_clk_get(dev, "pcie_apb_phy"); - if (IS_ERR(kirin_pcie->apb_phy_clk)) - return PTR_ERR(kirin_pcie->apb_phy_clk); - kirin_pcie->apb_sys_clk = devm_clk_get(dev, "pcie_apb_sys"); if (IS_ERR(kirin_pcie->apb_sys_clk)) return PTR_ERR(kirin_pcie->apb_sys_clk); @@ -152,62 +101,9 @@ static long kirin_pcie_get_resource(struct kirin_pcie *kirin_pcie, if (IS_ERR(kirin_pcie->apb_base)) return PTR_ERR(kirin_pcie->apb_base); - kirin_pcie->phy_base = - devm_platform_ioremap_resource_byname(pdev, "phy"); - if (IS_ERR(kirin_pcie->phy_base)) - return PTR_ERR(kirin_pcie->phy_base); - - kirin_pcie->crgctrl = - syscon_regmap_lookup_by_compatible("hisilicon,hi3660-crgctrl"); - if (IS_ERR(kirin_pcie->crgctrl)) - return PTR_ERR(kirin_pcie->crgctrl); - - kirin_pcie->sysctrl = - syscon_regmap_lookup_by_compatible("hisilicon,hi3660-sctrl"); - if (IS_ERR(kirin_pcie->sysctrl)) - return PTR_ERR(kirin_pcie->sysctrl); - return 0; } -static int kirin_pcie_phy_init(struct kirin_pcie *kirin_pcie) -{ - struct device *dev = kirin_pcie->pci->dev; - u32 reg_val; - - reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL1); - reg_val &= ~PHY_REF_PAD_BIT; - kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL1); - - reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL0); - reg_val &= ~PHY_PWR_DOWN_BIT; - kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL0); - usleep_range(TIME_PHY_PD_MIN, TIME_PHY_PD_MAX); - - reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL1); - reg_val &= ~PHY_RST_ACK_BIT; - kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL1); - - usleep_range(PIPE_CLK_WAIT_MIN, PIPE_CLK_WAIT_MAX); - reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_STATUS0); - if (reg_val & PIPE_CLK_STABLE) { - dev_err(dev, "PIPE clk is not stable\n"); - return -EINVAL; - } - - return 0; -} - -static void kirin_pcie_oe_enable(struct kirin_pcie *kirin_pcie) -{ - u32 val; - - regmap_read(kirin_pcie->sysctrl, SCTRL_PCIE_OE_OFFSET, &val); - val |= PCIE_DEBOUNCE_PARAM; - val &= ~PCIE_OE_BYPASS; - regmap_write(kirin_pcie->sysctrl, SCTRL_PCIE_OE_OFFSET, val); -} - static int kirin_pcie_clk_ctrl(struct kirin_pcie *kirin_pcie, bool enable) { int ret = 0; @@ -215,21 +111,9 @@ static int kirin_pcie_clk_ctrl(struct kirin_pcie *kirin_pcie, bool enable) if (!enable) goto close_clk; - ret = clk_set_rate(kirin_pcie->phy_ref_clk, REF_CLK_FREQ); - if (ret) - return ret; - - ret = clk_prepare_enable(kirin_pcie->phy_ref_clk); - if (ret) - return ret; - ret = clk_prepare_enable(kirin_pcie->apb_sys_clk); if (ret) - goto apb_sys_fail; - - ret = clk_prepare_enable(kirin_pcie->apb_phy_clk); - if (ret) - goto apb_phy_fail; + return ret; ret = clk_prepare_enable(kirin_pcie->pcie_aclk); if (ret) @@ -246,11 +130,7 @@ static int kirin_pcie_clk_ctrl(struct kirin_pcie *kirin_pcie, bool enable) aux_clk_fail: clk_disable_unprepare(kirin_pcie->pcie_aclk); aclk_fail: - clk_disable_unprepare(kirin_pcie->apb_phy_clk); -apb_phy_fail: clk_disable_unprepare(kirin_pcie->apb_sys_clk); -apb_sys_fail: - clk_disable_unprepare(kirin_pcie->phy_ref_clk); return ret; } @@ -259,41 +139,18 @@ static int kirin_pcie_power_on(struct kirin_pcie *kirin_pcie) { int ret; - /* Power supply for Host */ - regmap_write(kirin_pcie->sysctrl, - SCTRL_PCIE_CMOS_OFFSET, SCTRL_PCIE_CMOS_BIT); - usleep_range(TIME_CMOS_MIN, TIME_CMOS_MAX); - kirin_pcie_oe_enable(kirin_pcie); + ret = phy_init(kirin_pcie->phy); + if (ret) + return ret; ret = kirin_pcie_clk_ctrl(kirin_pcie, true); if (ret) return ret; - /* ISO disable, PCIeCtrl, PHY assert and clk gate clear */ - regmap_write(kirin_pcie->sysctrl, - SCTRL_PCIE_ISO_OFFSET, SCTRL_PCIE_ISO_BIT); - regmap_write(kirin_pcie->crgctrl, - CRGCTRL_PCIE_ASSERT_OFFSET, CRGCTRL_PCIE_ASSERT_BIT); - regmap_write(kirin_pcie->sysctrl, - SCTRL_PCIE_HPCLK_OFFSET, SCTRL_PCIE_HPCLK_BIT); - - ret = kirin_pcie_phy_init(kirin_pcie); + ret = phy_power_on(kirin_pcie->phy); if (ret) - goto close_clk; + kirin_pcie_clk_ctrl(kirin_pcie, false); - /* perst assert Endpoint */ - if (!gpio_request(kirin_pcie->gpio_id_reset, "pcie_perst")) { - usleep_range(REF_2_PERST_MIN, REF_2_PERST_MAX); - ret = gpio_direction_output(kirin_pcie->gpio_id_reset, 1); - if (ret) - goto close_clk; - usleep_range(PERST_2_ACCESS_MIN, PERST_2_ACCESS_MAX); - - return 0; - } - -close_clk: - kirin_pcie_clk_ctrl(kirin_pcie, false); return ret; } @@ -448,26 +305,41 @@ static int kirin_pcie_probe(struct platform_device *pdev) if (ret) return ret; + kirin_pcie->phy = devm_of_phy_get(dev, dev->of_node, NULL); + if (IS_ERR(kirin_pcie->phy)) + return PTR_ERR(kirin_pcie->phy); + ret = kirin_pcie_get_resource(kirin_pcie, pdev); if (ret) return ret; - kirin_pcie->gpio_id_reset = of_get_named_gpio(dev->of_node, - "reset-gpios", 0); - if (kirin_pcie->gpio_id_reset == -EPROBE_DEFER) { - return -EPROBE_DEFER; - } else if (!gpio_is_valid(kirin_pcie->gpio_id_reset)) { - dev_err(dev, "unable to get a valid gpio pin\n"); - return -ENODEV; - } - ret = kirin_pcie_power_on(kirin_pcie); if (ret) return ret; platform_set_drvdata(pdev, kirin_pcie); - return dw_pcie_host_init(&pci->pp); + ret = dw_pcie_host_init(&pci->pp); + if (ret) { + phy_power_off(kirin_pcie->phy); + goto err; + } + + return 0; +err: + phy_exit(kirin_pcie->phy); + + return ret; +} + +static int __exit kirin_pcie_remove(struct platform_device *pdev) +{ + struct kirin_pcie *kirin_pcie = platform_get_drvdata(pdev); + + phy_power_off(kirin_pcie->phy); + phy_exit(kirin_pcie->phy); + + return 0; } static const struct of_device_id kirin_pcie_match[] = { @@ -477,6 +349,7 @@ static const struct of_device_id kirin_pcie_match[] = { static struct platform_driver kirin_pcie_driver = { .probe = kirin_pcie_probe, + .remove = __exit_p(kirin_pcie_remove), .driver = { .name = "kirin-pcie", .of_match_table = kirin_pcie_match, diff --git a/drivers/phy/hisilicon/Kconfig b/drivers/phy/hisilicon/Kconfig index 4d008cfc279c..c0725907e2cb 100644 --- a/drivers/phy/hisilicon/Kconfig +++ b/drivers/phy/hisilicon/Kconfig @@ -23,6 +23,16 @@ config PHY_HI3660_USB To compile this driver as a module, choose M here. +config PHY_HI3660_PCIE + tristate "hi3660 PCIe PHY support" + depends on (ARCH_HISI && ARM64) || COMPILE_TEST + select GENERIC_PHY + select MFD_SYSCON + help + Enable this to support the HISILICON HI3660 PCIe PHY. + + To compile this driver as a module, choose M here. + config PHY_HI3670_USB tristate "hi3670 USB PHY support" depends on (ARCH_HISI && ARM64) || COMPILE_TEST diff --git a/drivers/phy/hisilicon/Makefile b/drivers/phy/hisilicon/Makefile index 51729868145b..3c3d70dd7469 100644 --- a/drivers/phy/hisilicon/Makefile +++ b/drivers/phy/hisilicon/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0-only obj-$(CONFIG_PHY_HI6220_USB) += phy-hi6220-usb.o obj-$(CONFIG_PHY_HI3660_USB) += phy-hi3660-usb3.o +obj-$(CONFIG_PHY_HI3660_PCIE) += phy-hi3660-pcie.o obj-$(CONFIG_PHY_HI3670_USB) += phy-hi3670-usb3.o obj-$(CONFIG_PHY_HISTB_COMBPHY) += phy-histb-combphy.o obj-$(CONFIG_PHY_HISI_INNO_USB2) += phy-hisi-inno-usb2.o diff --git a/drivers/phy/hisilicon/phy-hi3660-pcie.c b/drivers/phy/hisilicon/phy-hi3660-pcie.c new file mode 100644 index 000000000000..de1d5e86435e --- /dev/null +++ b/drivers/phy/hisilicon/phy-hi3660-pcie.c @@ -0,0 +1,261 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PCIe phy driver for Kirin 960 + * + * Copyright (C) 2017 HiSilicon Electronics Co., Ltd. + * https://www.huawei.com + * + * Copyright (C) 2021 Huawei Electronics Co., Ltd. + * https://www.huawei.com + * + * Author: + * Mauro Carvalho Chehab + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define REF_CLK_FREQ 100000000 + +/* info located in APB PHY */ +#define PCIE_APB_PHY_CTRL0 0x0 +#define PCIE_APB_PHY_CTRL1 0x4 +#define PCIE_APB_PHY_STATUS0 0x400 +#define PIPE_CLK_STABLE BIT(19) +#define PHY_REF_PAD_BIT BIT(8) +#define PHY_PWR_DOWN_BIT BIT(22) +#define PHY_RST_ACK_BIT BIT(16) + +/* info located in sysctrl */ +#define SCTRL_PCIE_CMOS_OFFSET 0x60 +#define SCTRL_PCIE_CMOS_BIT 0x10 +#define SCTRL_PCIE_ISO_OFFSET 0x44 +#define SCTRL_PCIE_ISO_BIT 0x30 +#define SCTRL_PCIE_HPCLK_OFFSET 0x190 +#define SCTRL_PCIE_HPCLK_BIT 0x184000 +#define SCTRL_PCIE_OE_OFFSET 0x14a +#define PCIE_DEBOUNCE_PARAM 0xF0F400 +#define PCIE_OE_BYPASS (0x3 << 28) + +/* peri_crg ctrl */ +#define CRGCTRL_PCIE_ASSERT_OFFSET 0x88 +#define CRGCTRL_PCIE_ASSERT_BIT 0x8c000000 + +/* Time for delay */ +#define REF_2_PERST_MIN 20000 +#define REF_2_PERST_MAX 25000 +#define PERST_2_ACCESS_MIN 10000 +#define PERST_2_ACCESS_MAX 12000 +#define PIPE_CLK_WAIT_MIN 550 +#define PIPE_CLK_WAIT_MAX 600 +#define TIME_CMOS_MIN 100 +#define TIME_CMOS_MAX 105 +#define TIME_PHY_PD_MIN 10 +#define TIME_PHY_PD_MAX 11 + +struct hi3660_pcie_phy { + struct device *dev; + void __iomem *base; + struct regmap *crgctrl; + struct regmap *sysctrl; + struct clk *phy_ref_clk; + struct clk *apb_phy_clk; + int gpio_id_reset; +}; + +/* Registers in PCIePHY */ +static inline void kirin_apb_phy_writel(struct hi3660_pcie_phy *hi3660_pcie_phy, + u32 val, u32 reg) +{ + writel(val, hi3660_pcie_phy->base + reg); +} + +static inline u32 kirin_apb_phy_readl(struct hi3660_pcie_phy *hi3660_pcie_phy, + u32 reg) +{ + return readl(hi3660_pcie_phy->base + reg); +} + +static void hi3660_pcie_phy_oe_enable(struct hi3660_pcie_phy *phy) +{ + u32 val; + + regmap_read(phy->sysctrl, SCTRL_PCIE_OE_OFFSET, &val); + val |= PCIE_DEBOUNCE_PARAM; + val &= ~PCIE_OE_BYPASS; + regmap_write(phy->sysctrl, SCTRL_PCIE_OE_OFFSET, val); +} + +static int hi3660_pcie_phy_init(struct phy *generic_phy) +{ + struct hi3660_pcie_phy *phy = phy_get_drvdata(generic_phy); + int ret; + + /* Power supply for Host */ + regmap_write(phy->sysctrl, + SCTRL_PCIE_CMOS_OFFSET, SCTRL_PCIE_CMOS_BIT); + usleep_range(TIME_CMOS_MIN, TIME_CMOS_MAX); + + hi3660_pcie_phy_oe_enable(phy); + + ret = clk_set_rate(phy->phy_ref_clk, REF_CLK_FREQ); + if (ret) + return ret; + + return clk_prepare_enable(phy->phy_ref_clk); +} + +static int hi3660_pcie_phy_power_on(struct phy *generic_phy) +{ + struct hi3660_pcie_phy *phy = phy_get_drvdata(generic_phy); + struct device *dev = phy->dev; + u32 reg_val; + int ret; + + ret = clk_prepare_enable(phy->apb_phy_clk); + if (ret) + goto disable_phy_clk; + + /* ISO disable, PCIeCtrl, PHY assert and clk gate clear */ + regmap_write(phy->sysctrl, + SCTRL_PCIE_ISO_OFFSET, SCTRL_PCIE_ISO_BIT); + regmap_write(phy->crgctrl, + CRGCTRL_PCIE_ASSERT_OFFSET, CRGCTRL_PCIE_ASSERT_BIT); + regmap_write(phy->sysctrl, + SCTRL_PCIE_HPCLK_OFFSET, SCTRL_PCIE_HPCLK_BIT); + + reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_CTRL1); + reg_val &= ~PHY_REF_PAD_BIT; + kirin_apb_phy_writel(phy, reg_val, PCIE_APB_PHY_CTRL1); + + reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_CTRL0); + reg_val &= ~PHY_PWR_DOWN_BIT; + kirin_apb_phy_writel(phy, reg_val, PCIE_APB_PHY_CTRL0); + usleep_range(TIME_PHY_PD_MIN, TIME_PHY_PD_MAX); + + reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_CTRL1); + reg_val &= ~PHY_RST_ACK_BIT; + kirin_apb_phy_writel(phy, reg_val, PCIE_APB_PHY_CTRL1); + + usleep_range(PIPE_CLK_WAIT_MIN, PIPE_CLK_WAIT_MAX); + reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_STATUS0); + if (reg_val & PIPE_CLK_STABLE) { + dev_err(dev, "PIPE clk is not stable\n"); + ret = -EINVAL; + goto disable_clks; + } + + /* perst assert Endpoint */ + if (!gpio_request(phy->gpio_id_reset, "pcie_perst")) { + usleep_range(REF_2_PERST_MIN, REF_2_PERST_MAX); + ret = gpio_direction_output(phy->gpio_id_reset, 1); + if (ret) + goto disable_clks; + usleep_range(PERST_2_ACCESS_MIN, PERST_2_ACCESS_MAX); + return 0; + } + +disable_clks: + clk_disable_unprepare(phy->apb_phy_clk); +disable_phy_clk: + clk_disable_unprepare(phy->phy_ref_clk); + return ret; +} + +static int hi3660_pcie_phy_power_off(struct phy *generic_phy) +{ + struct hi3660_pcie_phy *phy = phy_get_drvdata(generic_phy); + + /* Drop power supply for Host */ + regmap_write(phy->sysctrl, SCTRL_PCIE_CMOS_OFFSET, 0x00); + + clk_disable_unprepare(phy->apb_phy_clk); + clk_disable_unprepare(phy->phy_ref_clk); + + return 0; +} + +static const struct phy_ops hi3660_phy_ops = { + .init = hi3660_pcie_phy_init, + .power_on = hi3660_pcie_phy_power_on, + .power_off = hi3660_pcie_phy_power_off, + .owner = THIS_MODULE, +}; + +static int hi3660_pcie_phy_probe(struct platform_device *pdev) +{ + struct phy_provider *phy_provider; + struct device *dev = &pdev->dev; + struct hi3660_pcie_phy *phy; + struct phy *generic_phy; + + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); + if (!phy) + return -ENOMEM; + + phy->dev = dev; + + phy->phy_ref_clk = devm_clk_get(dev, "pcie_phy_ref"); + if (IS_ERR(phy->phy_ref_clk)) + return PTR_ERR(phy->phy_ref_clk); + + phy->apb_phy_clk = devm_clk_get(dev, "pcie_apb_phy"); + if (IS_ERR(phy->apb_phy_clk)) + return PTR_ERR(phy->apb_phy_clk); + + phy->base = devm_platform_ioremap_resource_byname(pdev, "phy"); + if (IS_ERR(phy->base)) + return PTR_ERR(phy->base); + + phy->crgctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3660-crgctrl"); + if (IS_ERR(phy->crgctrl)) + return PTR_ERR(phy->crgctrl); + + phy->sysctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3660-sctrl"); + if (IS_ERR(phy->sysctrl)) + return PTR_ERR(phy->sysctrl); + + phy->gpio_id_reset = of_get_named_gpio(dev->of_node, + "reset-gpios", 0); + if (phy->gpio_id_reset == -EPROBE_DEFER) { + return -EPROBE_DEFER; + } else if (!gpio_is_valid(phy->gpio_id_reset)) { + dev_err(dev, "unable to get a valid gpio pin\n"); + return -ENODEV; + } + + generic_phy = devm_phy_create(dev, dev->of_node, &hi3660_phy_ops); + if (IS_ERR(generic_phy)) { + dev_err(dev, "failed to create PHY\n"); + return PTR_ERR(generic_phy); + } + + phy_set_drvdata(generic_phy, phy); + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + + return PTR_ERR_OR_ZERO(phy_provider); +} + +static const struct of_device_id hi3660_pcie_phy_match[] = { + { + .compatible = "hisilicon,hi960-pcie-phy", + }, + {}, +}; + +static struct platform_driver hi3660_pcie_phy_driver = { + .probe = hi3660_pcie_phy_probe, + .driver = { + .of_match_table = hi3660_pcie_phy_match, + .name = "hi3660_pcie_phy", + .suppress_bind_attrs = true, + } +}; +builtin_platform_driver(hi3660_pcie_phy_driver);