From 4b1a2716299c0e96a698044aebf3f80513509ae7 Mon Sep 17 00:00:00 2001 From: Daniel Golle Date: Tue, 12 Dec 2023 03:47:18 +0000 Subject: [PATCH 3/5] net: pcs: pcs-mtk-lynxi: add platform driver for MT7988 Introduce a proper platform MFD driver for the LynxI (H)SGMII PCS which is going to initially be used for the MT7988 SoC. Signed-off-by: Daniel Golle --- drivers/net/pcs/pcs-mtk-lynxi.c | 227 ++++++++++++++++++++++++++++-- include/linux/pcs/pcs-mtk-lynxi.h | 11 ++ 2 files changed, 227 insertions(+), 11 deletions(-) --- a/drivers/net/pcs/pcs-mtk-lynxi.c +++ b/drivers/net/pcs/pcs-mtk-lynxi.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2018-2019 MediaTek Inc. -/* A library for MediaTek SGMII circuit +/* A library and platform driver for the MediaTek LynxI SGMII circuit * * Author: Sean Wang * Author: Alexander Couzens @@ -8,11 +8,17 @@ * */ +#include #include +#include +#include #include +#include #include #include +#include #include +#include /* SGMII subsystem config registers */ /* BMCR (low 16) BMSR (high 16) */ @@ -65,6 +71,8 @@ #define SGMII_PN_SWAP_MASK GENMASK(1, 0) #define SGMII_PN_SWAP_TX_RX (BIT(0) | BIT(1)) +#define MTK_NETSYS_V3_AMA_RGC3 0x128 + /* struct mtk_pcs_lynxi - This structure holds each sgmii regmap andassociated * data * @regmap: The register map pointing at the range used to setup @@ -74,15 +82,29 @@ * @interface: Currently configured interface mode * @pcs: Phylink PCS structure * @flags: Flags indicating hardware properties + * @rstc: Reset controller + * @sgmii_sel: SGMII Register Clock + * @sgmii_rx: SGMII RX Clock + * @sgmii_tx: SGMII TX Clock + * @node: List node */ struct mtk_pcs_lynxi { struct regmap *regmap; + struct device *dev; u32 ana_rgc3; phy_interface_t interface; struct phylink_pcs pcs; u32 flags; + struct reset_control *rstc; + struct clk *sgmii_sel; + struct clk *sgmii_rx; + struct clk *sgmii_tx; + struct list_head node; }; +static LIST_HEAD(mtk_pcs_lynxi_instances); +static DEFINE_MUTEX(instance_mutex); + static struct mtk_pcs_lynxi *pcs_to_mtk_pcs_lynxi(struct phylink_pcs *pcs) { return container_of(pcs, struct mtk_pcs_lynxi, pcs); @@ -102,6 +124,17 @@ static void mtk_pcs_lynxi_get_state(stru FIELD_GET(SGMII_LPA, adv)); } +static void mtk_sgmii_reset(struct mtk_pcs_lynxi *mpcs) +{ + if (!mpcs->rstc) + return; + + reset_control_assert(mpcs->rstc); + udelay(100); + reset_control_deassert(mpcs->rstc); + mdelay(1); +} + static int mtk_pcs_lynxi_config(struct phylink_pcs *pcs, unsigned int neg_mode, phy_interface_t interface, const unsigned long *advertising, @@ -148,6 +181,7 @@ static int mtk_pcs_lynxi_config(struct p SGMII_PHYA_PWD); /* Reset SGMII PCS state */ + mtk_sgmii_reset(mpcs); regmap_set_bits(mpcs->regmap, SGMSYS_RESERVED_0, SGMII_SW_RESET); @@ -234,10 +268,29 @@ static void mtk_pcs_lynxi_link_up(struct } } +static int mtk_pcs_lynxi_enable(struct phylink_pcs *pcs) +{ + struct mtk_pcs_lynxi *mpcs = pcs_to_mtk_pcs_lynxi(pcs); + + if (mpcs->sgmii_tx && mpcs->sgmii_rx) { + clk_prepare_enable(mpcs->sgmii_rx); + clk_prepare_enable(mpcs->sgmii_tx); + } + + return 0; +} + static void mtk_pcs_lynxi_disable(struct phylink_pcs *pcs) { struct mtk_pcs_lynxi *mpcs = pcs_to_mtk_pcs_lynxi(pcs); + regmap_set_bits(mpcs->regmap, SGMSYS_QPHY_PWR_STATE_CTRL, SGMII_PHYA_PWD); + + if (mpcs->sgmii_tx && mpcs->sgmii_rx) { + clk_disable_unprepare(mpcs->sgmii_tx); + clk_disable_unprepare(mpcs->sgmii_rx); + } + mpcs->interface = PHY_INTERFACE_MODE_NA; } @@ -247,11 +300,12 @@ static const struct phylink_pcs_ops mtk_ .pcs_an_restart = mtk_pcs_lynxi_restart_an, .pcs_link_up = mtk_pcs_lynxi_link_up, .pcs_disable = mtk_pcs_lynxi_disable, + .pcs_enable = mtk_pcs_lynxi_enable, }; -struct phylink_pcs *mtk_pcs_lynxi_create(struct device *dev, - struct regmap *regmap, u32 ana_rgc3, - u32 flags) +static struct phylink_pcs *mtk_pcs_lynxi_init(struct device *dev, struct regmap *regmap, + u32 ana_rgc3, u32 flags, + struct mtk_pcs_lynxi *prealloc) { struct mtk_pcs_lynxi *mpcs; u32 id, ver; @@ -259,29 +313,33 @@ struct phylink_pcs *mtk_pcs_lynxi_create ret = regmap_read(regmap, SGMSYS_PCS_DEVICE_ID, &id); if (ret < 0) - return NULL; + return ERR_PTR(ret); if (id != SGMII_LYNXI_DEV_ID) { dev_err(dev, "unknown PCS device id %08x\n", id); - return NULL; + return ERR_PTR(-ENODEV); } ret = regmap_read(regmap, SGMSYS_PCS_SCRATCH, &ver); if (ret < 0) - return NULL; + return ERR_PTR(ret); ver = FIELD_GET(SGMII_DEV_VERSION, ver); if (ver != 0x1) { dev_err(dev, "unknown PCS device version %04x\n", ver); - return NULL; + return ERR_PTR(-ENODEV); } dev_dbg(dev, "MediaTek LynxI SGMII PCS (id 0x%08x, ver 0x%04x)\n", id, ver); - mpcs = kzalloc(sizeof(*mpcs), GFP_KERNEL); - if (!mpcs) - return NULL; + if (prealloc) { + mpcs = prealloc; + } else { + mpcs = kzalloc(sizeof(*mpcs), GFP_KERNEL); + if (!mpcs) + return ERR_PTR(-ENOMEM); + }; mpcs->ana_rgc3 = ana_rgc3; mpcs->regmap = regmap; @@ -292,6 +350,13 @@ struct phylink_pcs *mtk_pcs_lynxi_create mpcs->interface = PHY_INTERFACE_MODE_NA; return &mpcs->pcs; +}; + +struct phylink_pcs *mtk_pcs_lynxi_create(struct device *dev, + struct regmap *regmap, u32 ana_rgc3, + u32 flags) +{ + return mtk_pcs_lynxi_init(dev, regmap, ana_rgc3, flags, NULL); } EXPORT_SYMBOL(mtk_pcs_lynxi_create); @@ -304,4 +369,144 @@ void mtk_pcs_lynxi_destroy(struct phylin } EXPORT_SYMBOL(mtk_pcs_lynxi_destroy); +static int mtk_pcs_lynxi_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct mtk_pcs_lynxi *mpcs; + struct phylink_pcs *pcs; + struct regmap *regmap; + u32 flags = 0; + + mpcs = devm_kzalloc(dev, sizeof(*mpcs), GFP_KERNEL); + if (!mpcs) + return -ENOMEM; + + mpcs->dev = dev; + regmap = syscon_node_to_regmap(np->parent); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + if (of_property_read_bool(np->parent, "mediatek,pnswap")) + flags |= MTK_SGMII_FLAG_PN_SWAP; + + mpcs->rstc = of_reset_control_get_shared(np->parent, NULL); + if (IS_ERR(mpcs->rstc)) + return PTR_ERR(mpcs->rstc); + + reset_control_deassert(mpcs->rstc); + mpcs->sgmii_sel = devm_clk_get_enabled(dev, "sgmii_sel"); + if (IS_ERR(mpcs->sgmii_sel)) + return PTR_ERR(mpcs->sgmii_sel); + + mpcs->sgmii_rx = devm_clk_get(dev, "sgmii_rx"); + if (IS_ERR(mpcs->sgmii_rx)) + return PTR_ERR(mpcs->sgmii_rx); + + mpcs->sgmii_tx = devm_clk_get(dev, "sgmii_tx"); + if (IS_ERR(mpcs->sgmii_tx)) + return PTR_ERR(mpcs->sgmii_tx); + + pcs = mtk_pcs_lynxi_init(dev, regmap, (uintptr_t)of_device_get_match_data(dev), + flags, mpcs); + if (IS_ERR(pcs)) + return PTR_ERR(pcs); + + regmap_set_bits(mpcs->regmap, SGMSYS_QPHY_PWR_STATE_CTRL, SGMII_PHYA_PWD); + + platform_set_drvdata(pdev, mpcs); + + mutex_lock(&instance_mutex); + list_add_tail(&mpcs->node, &mtk_pcs_lynxi_instances); + mutex_unlock(&instance_mutex); + + return 0; +} + +static int mtk_pcs_lynxi_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct mtk_pcs_lynxi *cur, *tmp; + + mutex_lock(&instance_mutex); + list_for_each_entry_safe(cur, tmp, &mtk_pcs_lynxi_instances, node) + if (cur->dev == dev) { + list_del(&cur->node); + kfree(cur); + break; + } + mutex_unlock(&instance_mutex); + + return 0; +} + +static const struct of_device_id mtk_pcs_lynxi_of_match[] = { + { .compatible = "mediatek,mt7988-sgmii", .data = (void *)MTK_NETSYS_V3_AMA_RGC3 }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, mtk_pcs_lynxi_of_match); + +struct phylink_pcs *mtk_pcs_lynxi_get(struct device *dev, struct device_node *np) +{ + struct platform_device *pdev; + struct mtk_pcs_lynxi *mpcs; + + if (!np) + return NULL; + + if (!of_device_is_available(np)) + return ERR_PTR(-ENODEV); + + if (!of_match_node(mtk_pcs_lynxi_of_match, np)) + return ERR_PTR(-EINVAL); + + pdev = of_find_device_by_node(np); + if (!pdev || !platform_get_drvdata(pdev)) { + if (pdev) + put_device(&pdev->dev); + return ERR_PTR(-EPROBE_DEFER); + } + + mpcs = platform_get_drvdata(pdev); + device_link_add(dev, mpcs->dev, DL_FLAG_AUTOREMOVE_CONSUMER); + + return &mpcs->pcs; +} +EXPORT_SYMBOL(mtk_pcs_lynxi_get); + +void mtk_pcs_lynxi_put(struct phylink_pcs *pcs) +{ + struct mtk_pcs_lynxi *cur, *mpcs = NULL; + + if (!pcs) + return; + + mutex_lock(&instance_mutex); + list_for_each_entry(cur, &mtk_pcs_lynxi_instances, node) + if (pcs == &cur->pcs) { + mpcs = cur; + break; + } + mutex_unlock(&instance_mutex); + + if (WARN_ON(!mpcs)) + return; + + put_device(mpcs->dev); +} +EXPORT_SYMBOL(mtk_pcs_lynxi_put); + +static struct platform_driver mtk_pcs_lynxi_driver = { + .driver = { + .name = "mtk-pcs-lynxi", + .suppress_bind_attrs = true, + .of_match_table = mtk_pcs_lynxi_of_match, + }, + .probe = mtk_pcs_lynxi_probe, + .remove = mtk_pcs_lynxi_remove, +}; +module_platform_driver(mtk_pcs_lynxi_driver); + +MODULE_AUTHOR("Daniel Golle "); +MODULE_DESCRIPTION("MediaTek LynxI HSGMII PCS"); MODULE_LICENSE("GPL"); --- a/include/linux/pcs/pcs-mtk-lynxi.h +++ b/include/linux/pcs/pcs-mtk-lynxi.h @@ -10,4 +10,15 @@ struct phylink_pcs *mtk_pcs_lynxi_create struct regmap *regmap, u32 ana_rgc3, u32 flags); void mtk_pcs_lynxi_destroy(struct phylink_pcs *pcs); + +#if IS_ENABLED(CONFIG_PCS_MTK_LYNXI) +struct phylink_pcs *mtk_pcs_lynxi_get(struct device *dev, struct device_node *np); +void mtk_pcs_lynxi_put(struct phylink_pcs *pcs); +#else +static inline struct phylink_pcs *mtk_pcs_lynxi_get(struct device *dev, struct device_node *np) +{ + return NULL; +} +static inline void mtk_pcs_lynxi_put(struct phylink_pcs *pcs) { } +#endif /* IS_ENABLED(CONFIG_PCS_MTK_LYNXI) */ #endif