From patchwork Sat May 7 06:06:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?Smlhbmp1biBXYW5nICjnjovlu7rlhpsp?= X-Patchwork-Id: 12841869 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 286F7C433EF for ; Sat, 7 May 2022 06:13:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=rSqL9xabRUOEuCWxyp0K6JPE5O0hGiZCe3s+kMk/MwU=; b=utzZ3qoaH6DmVx GooCEgVIiuvbTgiqp0Q3fk4Bsm4ODoWCSSfqvxLxwjwde9MGNCy467u3QOKbBzH9sQQonI3DsPc0h gFlBpcvE4vRHCQOTVOt6PJMekgPbAFWEulVNKgC4+KUWamhyZkcvuhP3yt7IeHsrPraeww+1N59bP 8H7ZQqc/L+6P7sk3+61r03M+XrPgKgUvR/0MmyYWOxawIQHYbWqjyBJ4y8DgIKlUBipJAJ8USKA47 dSNbWdZ46fWJZnxmi/XqztIQKwWW27pfGEwekq5xT3QOVOTPTrI93IYZGNjqF5uJngWIsR6mA4Cwr w0waXK97Vg90T6ftYxWw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nnDfb-006Avo-KN; Sat, 07 May 2022 06:11:59 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nnDfX-006AuR-AE; Sat, 07 May 2022 06:11:57 +0000 X-UUID: 2ed4716967974ddabc86523a88babd1a-20220506 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.4, REQID:c215ad7b-b286-4e3d-abd1-170d7c0703df, OB:0, LO B:0,IP:0,URL:8,TC:0,Content:-20,EDM:0,RT:0,SF:0,FILE:0,RULE:Release_Ham,AC TION:release,TS:-12 X-CID-META: VersionHash:faefae9, CLOUDID:9e208916-2e53-443e-b81a-655c13977218, C OID:IGNORED,Recheck:0,SF:nil,TC:nil,Content:0,EDM:-3,File:nil,QS:0,BEC:nil X-UUID: 2ed4716967974ddabc86523a88babd1a-20220506 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 323056742; Fri, 06 May 2022 23:11:47 -0700 Received: from mtkmbs10n2.mediatek.inc (172.21.101.183) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 6 May 2022 23:06:35 -0700 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs10n2.mediatek.inc (172.21.101.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.792.3; Sat, 7 May 2022 14:06:34 +0800 Received: from localhost.localdomain (10.17.3.154) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.792.3 via Frontend Transport; Sat, 7 May 2022 14:06:33 +0800 From: Jianjun Wang To: Chunfeng Yun , Kishon Vijay Abraham I , Vinod Koul , Rob Herring , Matthias Brugger , Chen-Yu Tsai , AngeloGioacchino Del Regno , Krzysztof Kozlowski CC: Wei-Shun Chang , Jianjun Wang , , , , , , , , , , , Subject: [PATCH v8 2/2] phy: mediatek: Add PCIe PHY driver Date: Sat, 7 May 2022 14:06:21 +0800 Message-ID: <20220507060621.32252-3-jianjun.wang@mediatek.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220507060621.32252-1-jianjun.wang@mediatek.com> References: <20220507060621.32252-1-jianjun.wang@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220506_231155_406743_0384BDAA X-CRM114-Status: GOOD ( 27.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add PCIe GEN3 PHY driver support on MediaTek chipsets. Signed-off-by: Jianjun Wang Reviewed-by: AngeloGioacchino Del Regno --- drivers/phy/mediatek/Kconfig | 11 ++ drivers/phy/mediatek/Makefile | 1 + drivers/phy/mediatek/phy-mtk-pcie.c | 267 ++++++++++++++++++++++++++++ 3 files changed, 279 insertions(+) create mode 100644 drivers/phy/mediatek/phy-mtk-pcie.c diff --git a/drivers/phy/mediatek/Kconfig b/drivers/phy/mediatek/Kconfig index 55f8e6c048ab..387ed1b3f2cc 100644 --- a/drivers/phy/mediatek/Kconfig +++ b/drivers/phy/mediatek/Kconfig @@ -55,3 +55,14 @@ config PHY_MTK_MIPI_DSI select GENERIC_PHY help Support MIPI DSI for Mediatek SoCs. + +config PHY_MTK_PCIE + tristate "MediaTek PCIe-PHY Driver" + depends on ARCH_MEDIATEK || COMPILE_TEST + depends on OF + select GENERIC_PHY + help + Say 'Y' here to add support for MediaTek PCIe PHY driver. + This driver create the basic PHY instance and provides initialize + callback for PCIe GEN3 port, it supports software efuse + initialization. diff --git a/drivers/phy/mediatek/Makefile b/drivers/phy/mediatek/Makefile index ace660fbed3a..788c13147f63 100644 --- a/drivers/phy/mediatek/Makefile +++ b/drivers/phy/mediatek/Makefile @@ -6,6 +6,7 @@ obj-$(CONFIG_PHY_MTK_TPHY) += phy-mtk-tphy.o obj-$(CONFIG_PHY_MTK_UFS) += phy-mtk-ufs.o obj-$(CONFIG_PHY_MTK_XSPHY) += phy-mtk-xsphy.o +obj-$(CONFIG_PHY_MTK_PCIE) += phy-mtk-pcie.o phy-mtk-hdmi-drv-y := phy-mtk-hdmi.o phy-mtk-hdmi-drv-y += phy-mtk-hdmi-mt2701.o diff --git a/drivers/phy/mediatek/phy-mtk-pcie.c b/drivers/phy/mediatek/phy-mtk-pcie.c new file mode 100644 index 000000000000..e4bcf1e9941c --- /dev/null +++ b/drivers/phy/mediatek/phy-mtk-pcie.c @@ -0,0 +1,267 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2022 MediaTek Inc. + * Author: Jianjun Wang + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "phy-mtk-io.h" + +#define PEXTP_ANA_GLB_00_REG 0x9000 +/* Internal Resistor Selection of TX Bias Current */ +#define EFUSE_GLB_INTR_SEL GENMASK(28, 24) + +#define PEXTP_ANA_LN0_TRX_REG 0xa000 + +#define PEXTP_ANA_TX_REG 0x04 +/* TX PMOS impedance selection */ +#define EFUSE_LN_TX_PMOS_SEL GENMASK(5, 2) +/* TX NMOS impedance selection */ +#define EFUSE_LN_TX_NMOS_SEL GENMASK(11, 8) + +#define PEXTP_ANA_RX_REG 0x3c +/* RX impedance selection */ +#define EFUSE_LN_RX_SEL GENMASK(3, 0) + +#define PEXTP_ANA_LANE_OFFSET 0x100 + +/** + * struct mtk_pcie_lane_efuse - eFuse data for each lane + * @tx_pmos: TX PMOS impedance selection data + * @tx_nmos: TX NMOS impedance selection data + * @rx_data: RX impedance selection data + * @lane_efuse_supported: software eFuse data is supported for this lane + */ +struct mtk_pcie_lane_efuse { + u32 tx_pmos; + u32 tx_nmos; + u32 rx_data; + bool lane_efuse_supported; +}; + +/** + * struct mtk_pcie_phy_data - phy data for each SoC + * @num_lanes: supported lane numbers + * @sw_efuse_supported: support software to load eFuse data + */ +struct mtk_pcie_phy_data { + int num_lanes; + bool sw_efuse_supported; +}; + +/** + * struct mtk_pcie_phy - PCIe phy driver main structure + * @dev: pointer to device + * @phy: pointer to generic phy + * @sif_base: IO mapped register base address of system interface + * @data: pointer to SoC dependent data + * @sw_efuse_en: software eFuse enable status + * @efuse_glb_intr: internal resistor selection of TX bias current data + * @efuse: pointer to eFuse data for each lane + */ +struct mtk_pcie_phy { + struct device *dev; + struct phy *phy; + void __iomem *sif_base; + const struct mtk_pcie_phy_data *data; + + bool sw_efuse_en; + u32 efuse_glb_intr; + struct mtk_pcie_lane_efuse *efuse; +}; + +static void mtk_pcie_efuse_set_lane(struct mtk_pcie_phy *pcie_phy, + unsigned int lane) +{ + struct mtk_pcie_lane_efuse *data = &pcie_phy->efuse[lane]; + void __iomem *addr; + + if (!data->lane_efuse_supported) + return; + + addr = pcie_phy->sif_base + PEXTP_ANA_LN0_TRX_REG + + lane * PEXTP_ANA_LANE_OFFSET; + + mtk_phy_update_bits(addr + PEXTP_ANA_TX_REG, EFUSE_LN_TX_PMOS_SEL, + FIELD_PREP(EFUSE_LN_TX_PMOS_SEL, data->tx_pmos)); + + mtk_phy_update_bits(addr + PEXTP_ANA_TX_REG, EFUSE_LN_TX_NMOS_SEL, + FIELD_PREP(EFUSE_LN_TX_NMOS_SEL, data->tx_nmos)); + + mtk_phy_update_bits(addr + PEXTP_ANA_RX_REG, EFUSE_LN_RX_SEL, + FIELD_PREP(EFUSE_LN_RX_SEL, data->rx_data)); +} + +/** + * mtk_pcie_phy_init() - Initialize the phy + * @phy: the phy to be initialized + * + * Initialize the phy by setting the efuse data. + * The hardware settings will be reset during suspend, it should be + * reinitialized when the consumer calls phy_init() again on resume. + */ +static int mtk_pcie_phy_init(struct phy *phy) +{ + struct mtk_pcie_phy *pcie_phy = phy_get_drvdata(phy); + int i; + + if (!pcie_phy->sw_efuse_en) + return 0; + + /* Set global data */ + mtk_phy_update_bits(pcie_phy->sif_base + PEXTP_ANA_GLB_00_REG, + EFUSE_GLB_INTR_SEL, + FIELD_PREP(EFUSE_GLB_INTR_SEL, pcie_phy->efuse_glb_intr)); + + for (i = 0; i < pcie_phy->data->num_lanes; i++) + mtk_pcie_efuse_set_lane(pcie_phy, i); + + return 0; +} + +static const struct phy_ops mtk_pcie_phy_ops = { + .init = mtk_pcie_phy_init, + .owner = THIS_MODULE, +}; + +static int mtk_pcie_efuse_read_for_lane(struct mtk_pcie_phy *pcie_phy, + unsigned int lane) +{ + struct mtk_pcie_lane_efuse *efuse = &pcie_phy->efuse[lane]; + struct device *dev = pcie_phy->dev; + char efuse_id[16]; + int ret; + + snprintf(efuse_id, sizeof(efuse_id), "tx_ln%d_pmos", lane); + ret = nvmem_cell_read_variable_le_u32(dev, efuse_id, &efuse->tx_pmos); + if (ret) + return dev_err_probe(dev, ret, "Failed to read %s\n", efuse_id); + + snprintf(efuse_id, sizeof(efuse_id), "tx_ln%d_nmos", lane); + ret = nvmem_cell_read_variable_le_u32(dev, efuse_id, &efuse->tx_nmos); + if (ret) + return dev_err_probe(dev, ret, "Failed to read %s\n", efuse_id); + + snprintf(efuse_id, sizeof(efuse_id), "rx_ln%d", lane); + ret = nvmem_cell_read_variable_le_u32(dev, efuse_id, &efuse->rx_data); + if (ret) + return dev_err_probe(dev, ret, "Failed to read %s\n", efuse_id); + + if (!(efuse->tx_pmos || efuse->tx_nmos || efuse->rx_data)) + return dev_err_probe(dev, -EINVAL, + "No eFuse data found for lane%d, but dts enable it\n", + lane); + + efuse->lane_efuse_supported = true; + + return 0; +} + +static int mtk_pcie_read_efuse(struct mtk_pcie_phy *pcie_phy) +{ + struct device *dev = pcie_phy->dev; + bool nvmem_enabled; + int ret, i; + + /* nvmem data is optional */ + nvmem_enabled = device_property_present(dev, "nvmem-cells"); + if (!nvmem_enabled) + return 0; + + ret = nvmem_cell_read_variable_le_u32(dev, "glb_intr", + &pcie_phy->efuse_glb_intr); + if (ret) + return dev_err_probe(dev, ret, "Failed to read glb_intr\n"); + + pcie_phy->sw_efuse_en = true; + + pcie_phy->efuse = devm_kzalloc(dev, pcie_phy->data->num_lanes * + sizeof(*pcie_phy->efuse), GFP_KERNEL); + if (!pcie_phy->efuse) + return -ENOMEM; + + for (i = 0; i < pcie_phy->data->num_lanes; i++) { + ret = mtk_pcie_efuse_read_for_lane(pcie_phy, i); + if (ret) + return ret; + } + + return 0; +} + +static int mtk_pcie_phy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct phy_provider *provider; + struct mtk_pcie_phy *pcie_phy; + int ret; + + pcie_phy = devm_kzalloc(dev, sizeof(*pcie_phy), GFP_KERNEL); + if (!pcie_phy) + return -ENOMEM; + + pcie_phy->sif_base = devm_platform_ioremap_resource_byname(pdev, "sif"); + if (IS_ERR(pcie_phy->sif_base)) + return dev_err_probe(dev, PTR_ERR(pcie_phy->sif_base), + "Failed to map phy-sif base\n"); + + pcie_phy->phy = devm_phy_create(dev, dev->of_node, &mtk_pcie_phy_ops); + if (IS_ERR(pcie_phy->phy)) + return dev_err_probe(dev, PTR_ERR(pcie_phy->phy), + "Failed to create PCIe phy\n"); + + pcie_phy->dev = dev; + pcie_phy->data = of_device_get_match_data(dev); + if (!pcie_phy->data) + return dev_err_probe(dev, -EINVAL, "Failed to get phy data\n"); + + if (pcie_phy->data->sw_efuse_supported) { + /* + * Failed to read the efuse data is not a fatal problem, + * ignore the failure and keep going. + */ + ret = mtk_pcie_read_efuse(pcie_phy); + if (ret == -EPROBE_DEFER) + return ret; + } + + phy_set_drvdata(pcie_phy->phy, pcie_phy); + + provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + if (IS_ERR(provider)) + return dev_err_probe(dev, PTR_ERR(provider), + "PCIe phy probe failed\n"); + + return 0; +} + +static const struct mtk_pcie_phy_data mt8195_data = { + .num_lanes = 2, + .sw_efuse_supported = true, +}; + +static const struct of_device_id mtk_pcie_phy_of_match[] = { + { .compatible = "mediatek,mt8195-pcie-phy", .data = &mt8195_data }, + { }, +}; +MODULE_DEVICE_TABLE(of, mtk_pcie_phy_of_match); + +static struct platform_driver mtk_pcie_phy_driver = { + .probe = mtk_pcie_phy_probe, + .driver = { + .name = "mtk-pcie-phy", + .of_match_table = mtk_pcie_phy_of_match, + }, +}; +module_platform_driver(mtk_pcie_phy_driver); + +MODULE_DESCRIPTION("MediaTek PCIe PHY driver"); +MODULE_AUTHOR("Jianjun Wang "); +MODULE_LICENSE("GPL");