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[93.34.90.129]) by smtp.googlemail.com with ESMTPSA id ffacd0b85a97d-3912bfdfddcsm12564875f8f.35.2025.03.09.10.28.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 09 Mar 2025 10:28:04 -0700 (PDT) From: Christian Marangi To: Lee Jones , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Christian Marangi , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Vladimir Oltean , Srinivas Kandagatla , Heiner Kallweit , Russell King , Maxime Chevallier , Matthias Brugger , AngeloGioacchino Del Regno , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, netdev@vger.kernel.org, upstream@airoha.com Subject: [net-next PATCH v12 09/13] mfd: an8855: Add support for Airoha AN8855 Switch MFD Date: Sun, 9 Mar 2025 18:26:54 +0100 Message-ID: <20250309172717.9067-10-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250309172717.9067-1-ansuelsmth@gmail.com> References: <20250309172717.9067-1-ansuelsmth@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250309_102806_498891_EF081C8A X-CRM114-Status: GOOD ( 25.97 ) 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 support for Airoha AN8855 Switch MFD that provide support for a DSA switch and a NVMEM provider. Also provide support for a virtual MDIO passthrough as the PHYs address for the switch are shared with the switch address. Signed-off-by: Christian Marangi --- MAINTAINERS | 1 + drivers/mfd/Kconfig | 10 + drivers/mfd/Makefile | 1 + drivers/mfd/airoha-an8855.c | 445 ++++++++++++++++++++++++++++++++++++ 4 files changed, 457 insertions(+) create mode 100644 drivers/mfd/airoha-an8855.c diff --git a/MAINTAINERS b/MAINTAINERS index b7075425c94e..5844addbda2b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -730,6 +730,7 @@ F: Documentation/devicetree/bindings/net/airoha,an8855-mdio.yaml F: Documentation/devicetree/bindings/net/airoha,an8855-phy.yaml F: Documentation/devicetree/bindings/net/dsa/airoha,an8855-switch.yaml F: Documentation/devicetree/bindings/nvmem/airoha,an8855-efuse.yaml +F: drivers/mfd/airoha-an8855.c AIROHA ETHERNET DRIVER M: Lorenzo Bianconi diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 6b0682af6e32..1b5abe5e2694 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -53,6 +53,16 @@ config MFD_ALTERA_SYSMGR using regmap_mmio accesses for ARM32 parts and SMC calls to EL3 for ARM64 parts. +config MFD_AIROHA_AN8855 + tristate "Airoha AN8855 Switch MFD" + select MFD_CORE + select MDIO_DEVICE + depends on NETDEVICES && OF + help + Support for the Airoha AN8855 Switch MFD. This is a SoC Switch + that provides various peripherals. Currently it provides a + DSA switch and a NVMEM provider. + config MFD_ACT8945A tristate "Active-semi ACT8945A" select MFD_CORE diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 9220eaf7cf12..37677f65a981 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -8,6 +8,7 @@ obj-$(CONFIG_MFD_88PM860X) += 88pm860x.o obj-$(CONFIG_MFD_88PM800) += 88pm800.o 88pm80x.o obj-$(CONFIG_MFD_88PM805) += 88pm805.o 88pm80x.o obj-$(CONFIG_MFD_88PM886_PMIC) += 88pm886.o +obj-$(CONFIG_MFD_AIROHA_AN8855) += airoha-an8855.o obj-$(CONFIG_MFD_ACT8945A) += act8945a.o obj-$(CONFIG_MFD_SM501) += sm501.o obj-$(CONFIG_ARCH_BCM2835) += bcm2835-pm.o diff --git a/drivers/mfd/airoha-an8855.c b/drivers/mfd/airoha-an8855.c new file mode 100644 index 000000000000..0a6440bd4118 --- /dev/null +++ b/drivers/mfd/airoha-an8855.c @@ -0,0 +1,445 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * MFD driver for Airoha AN8855 Switch + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +/* Register for hw trap status */ +#define AN8855_HWTRAP 0x1000009c + +#define AN8855_CREV 0x10005000 +#define AN8855_ID 0x8855 + +#define AN8855_RG_GPHY_AFE_PWD 0x1028c840 + +/* MII Registers */ +#define AN8855_PHY_SELECT_PAGE 0x1f +#define AN8855_PHY_PAGE GENMASK(2, 0) +#define AN8855_PHY_PAGE_STANDARD FIELD_PREP_CONST(AN8855_PHY_PAGE, 0x0) +#define AN8855_PHY_PAGE_EXTENDED_1 FIELD_PREP_CONST(AN8855_PHY_PAGE, 0x1) +#define AN8855_PHY_PAGE_EXTENDED_4 FIELD_PREP_CONST(AN8855_PHY_PAGE, 0x4) + +/* MII Registers Page 4 */ +#define AN8855_PBUS_MODE 0x10 +#define AN8855_PBUS_MODE_ADDR_FIXED 0x0 +#define AN8855_PBUS_MODE_ADDR_INCR BIT(15) +#define AN8855_PBUS_WR_ADDR_HIGH 0x11 +#define AN8855_PBUS_WR_ADDR_LOW 0x12 +#define AN8855_PBUS_WR_DATA_HIGH 0x13 +#define AN8855_PBUS_WR_DATA_LOW 0x14 +#define AN8855_PBUS_RD_ADDR_HIGH 0x15 +#define AN8855_PBUS_RD_ADDR_LOW 0x16 +#define AN8855_PBUS_RD_DATA_HIGH 0x17 +#define AN8855_PBUS_RD_DATA_LOW 0x18 + +struct an8855_mfd_priv { + struct mii_bus *bus; + + unsigned int switch_addr; + u16 current_page; +}; + +static const struct mfd_cell an8855_mfd_devs[] = { + { + .name = "an8855-efuse", + .of_compatible = "airoha,an8855-efuse", + }, { + .name = "an8855-switch", + .of_compatible = "airoha,an8855-switch", + }, { + .name = "an8855-mdio", + .of_compatible = "airoha,an8855-mdio", + } +}; + +static int an8855_mii_set_page(struct an8855_mfd_priv *priv, u8 phy_id, + u8 page) __must_hold(&priv->bus->mdio_lock) +{ + struct mii_bus *bus = priv->bus; + int ret; + + ret = __mdiobus_write(bus, phy_id, AN8855_PHY_SELECT_PAGE, page); + if (ret < 0) + dev_err_ratelimited(&bus->dev, + "failed to set an8855 mii page\n"); + + /* Cache current page if next mii read/write is for switch */ + priv->current_page = page; + return ret < 0 ? ret : 0; +} + +static int an8855_mii_read32(struct mii_bus *bus, u8 phy_id, u32 reg, + u32 *val) __must_hold(&bus->mdio_lock) +{ + int lo, hi, ret; + + ret = __mdiobus_write(bus, phy_id, AN8855_PBUS_MODE, + AN8855_PBUS_MODE_ADDR_FIXED); + if (ret < 0) + goto err; + + ret = __mdiobus_write(bus, phy_id, AN8855_PBUS_RD_ADDR_HIGH, + upper_16_bits(reg)); + if (ret < 0) + goto err; + ret = __mdiobus_write(bus, phy_id, AN8855_PBUS_RD_ADDR_LOW, + lower_16_bits(reg)); + if (ret < 0) + goto err; + + hi = __mdiobus_read(bus, phy_id, AN8855_PBUS_RD_DATA_HIGH); + if (hi < 0) { + ret = hi; + goto err; + } + lo = __mdiobus_read(bus, phy_id, AN8855_PBUS_RD_DATA_LOW); + if (lo < 0) { + ret = lo; + goto err; + } + + *val = ((u16)hi << 16) | ((u16)lo & 0xffff); + + return 0; +err: + dev_err_ratelimited(&bus->dev, + "failed to read an8855 register\n"); + return ret; +} + +static int an8855_regmap_read(void *ctx, uint32_t reg, uint32_t *val) +{ + struct an8855_mfd_priv *priv = ctx; + struct mii_bus *bus = priv->bus; + u16 addr = priv->switch_addr; + int ret; + + mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); + ret = an8855_mii_set_page(priv, addr, AN8855_PHY_PAGE_EXTENDED_4); + if (ret < 0) + goto exit; + + ret = an8855_mii_read32(bus, addr, reg, val); + +exit: + mutex_unlock(&bus->mdio_lock); + + return ret < 0 ? ret : 0; +} + +static int an8855_mii_write32(struct mii_bus *bus, u8 phy_id, u32 reg, + u32 val) __must_hold(&bus->mdio_lock) +{ + int ret; + + ret = __mdiobus_write(bus, phy_id, AN8855_PBUS_MODE, + AN8855_PBUS_MODE_ADDR_FIXED); + if (ret < 0) + goto err; + + ret = __mdiobus_write(bus, phy_id, AN8855_PBUS_WR_ADDR_HIGH, + upper_16_bits(reg)); + if (ret < 0) + goto err; + ret = __mdiobus_write(bus, phy_id, AN8855_PBUS_WR_ADDR_LOW, + lower_16_bits(reg)); + if (ret < 0) + goto err; + + ret = __mdiobus_write(bus, phy_id, AN8855_PBUS_WR_DATA_HIGH, + upper_16_bits(val)); + if (ret < 0) + goto err; + ret = __mdiobus_write(bus, phy_id, AN8855_PBUS_WR_DATA_LOW, + lower_16_bits(val)); + if (ret < 0) + goto err; + + return 0; +err: + dev_err_ratelimited(&bus->dev, + "failed to write an8855 register\n"); + return ret; +} + +static int an8855_regmap_write(void *ctx, uint32_t reg, uint32_t val) +{ + struct an8855_mfd_priv *priv = ctx; + struct mii_bus *bus = priv->bus; + u16 addr = priv->switch_addr; + int ret; + + mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); + ret = an8855_mii_set_page(priv, addr, AN8855_PHY_PAGE_EXTENDED_4); + if (ret < 0) + goto exit; + + ret = an8855_mii_write32(bus, addr, reg, val); + +exit: + mutex_unlock(&bus->mdio_lock); + + return ret < 0 ? ret : 0; +} + +static int an8855_regmap_update_bits(void *ctx, uint32_t reg, uint32_t mask, + uint32_t write_val) +{ + struct an8855_mfd_priv *priv = ctx; + struct mii_bus *bus = priv->bus; + u16 addr = priv->switch_addr; + u32 val; + int ret; + + mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); + ret = an8855_mii_set_page(priv, addr, AN8855_PHY_PAGE_EXTENDED_4); + if (ret < 0) + goto exit; + + ret = an8855_mii_read32(bus, addr, reg, &val); + if (ret < 0) + goto exit; + + val &= ~mask; + val |= write_val; + ret = an8855_mii_write32(bus, addr, reg, val); + +exit: + mutex_unlock(&bus->mdio_lock); + + return ret < 0 ? ret : 0; +} + +static const struct regmap_range an8855_readable_ranges[] = { + regmap_reg_range(0x10000000, 0x10000fff), /* SCU */ + regmap_reg_range(0x10001000, 0x10001fff), /* RBUS */ + regmap_reg_range(0x10002000, 0x10002fff), /* MCU */ + regmap_reg_range(0x10005000, 0x10005fff), /* SYS SCU */ + regmap_reg_range(0x10007000, 0x10007fff), /* I2C Slave */ + regmap_reg_range(0x10008000, 0x10008fff), /* I2C Master */ + regmap_reg_range(0x10009000, 0x10009fff), /* PDMA */ + regmap_reg_range(0x1000a100, 0x1000a2ff), /* General Purpose Timer */ + regmap_reg_range(0x1000a200, 0x1000a2ff), /* GPU timer */ + regmap_reg_range(0x1000a300, 0x1000a3ff), /* GPIO */ + regmap_reg_range(0x1000a400, 0x1000a5ff), /* EFUSE */ + regmap_reg_range(0x1000c000, 0x1000cfff), /* GDMP CSR */ + regmap_reg_range(0x10010000, 0x1001ffff), /* GDMP SRAM */ + regmap_reg_range(0x10200000, 0x10203fff), /* Switch - ARL Global */ + regmap_reg_range(0x10204000, 0x10207fff), /* Switch - BMU */ + regmap_reg_range(0x10208000, 0x1020bfff), /* Switch - ARL Port */ + regmap_reg_range(0x1020c000, 0x1020cfff), /* Switch - SCH */ + regmap_reg_range(0x10210000, 0x10213fff), /* Switch - MAC */ + regmap_reg_range(0x10214000, 0x10217fff), /* Switch - MIB */ + regmap_reg_range(0x10218000, 0x1021bfff), /* Switch - Port Control */ + regmap_reg_range(0x1021c000, 0x1021ffff), /* Switch - TOP */ + regmap_reg_range(0x10220000, 0x1022ffff), /* SerDes */ + regmap_reg_range(0x10286000, 0x10286fff), /* RG Batcher */ + regmap_reg_range(0x1028c000, 0x1028ffff), /* ETHER_SYS */ + regmap_reg_range(0x30000000, 0x37ffffff), /* I2C EEPROM */ + regmap_reg_range(0x38000000, 0x3fffffff), /* BOOT_ROM */ + regmap_reg_range(0xa0000000, 0xbfffffff), /* GPHY */ +}; + +static const struct regmap_access_table an8855_readable_table = { + .yes_ranges = an8855_readable_ranges, + .n_yes_ranges = ARRAY_SIZE(an8855_readable_ranges), +}; + +static const struct regmap_config an8855_regmap_config = { + .name = "switch", + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .max_register = 0xbfffffff, + .reg_read = an8855_regmap_read, + .reg_write = an8855_regmap_write, + .reg_update_bits = an8855_regmap_update_bits, + .disable_locking = true, + .rd_table = &an8855_readable_table, +}; + +static int an855_regmap_phy_reset_page(struct an8855_mfd_priv *priv, + int phy) __must_hold(&priv->bus->mdio_lock) +{ + /* Check PHY page only for addr shared with switch */ + if (phy != priv->switch_addr) + return 0; + + /* Don't restore page if it's not set to switch page */ + if (priv->current_page != FIELD_GET(AN8855_PHY_PAGE, + AN8855_PHY_PAGE_EXTENDED_4)) + return 0; + + /* Restore page to 0, PHY might change page right after but that + * will be ignored as it won't be a switch page. + */ + return an8855_mii_set_page(priv, phy, AN8855_PHY_PAGE_STANDARD); +} + +static int an8855_regmap_phy_read(void *ctx, uint32_t reg, uint32_t *val) +{ + struct an8855_mfd_priv *priv = ctx; + struct mii_bus *bus = priv->bus; + u16 phy_id, addr; + int ret; + + phy_id = FIELD_GET(MDIO_REGMAP_PHY_ADDR, reg); + addr = FIELD_GET(MDIO_REGMAP_PHY_REG, reg); + + mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); + ret = an855_regmap_phy_reset_page(priv, phy_id); + if (ret) + goto exit; + + ret = __mdiobus_read(priv->bus, phy_id, addr); + +exit: + mutex_unlock(&bus->mdio_lock); + + if (ret < 0) + return ret; + + *val = ret; + return 0; +} + +static int an8855_regmap_phy_write(void *ctx, uint32_t reg, uint32_t val) +{ + struct an8855_mfd_priv *priv = ctx; + struct mii_bus *bus = priv->bus; + u16 phy_id, addr; + int ret; + + phy_id = FIELD_GET(MDIO_REGMAP_PHY_ADDR, reg); + addr = FIELD_GET(MDIO_REGMAP_PHY_REG, reg); + + mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); + ret = an855_regmap_phy_reset_page(priv, phy_id); + if (ret) + goto exit; + + ret = __mdiobus_write(priv->bus, phy_id, addr, val); + +exit: + mutex_unlock(&bus->mdio_lock); + + return ret; +} + +/* Regmap for MDIO Passtrough + * PHY Addr and PHY Reg are encoded in the regmap register. + */ +static const struct regmap_config an8855_regmap_phy_config = { + .name = "phy", + .reg_bits = 20, + .val_bits = 16, + .reg_stride = 1, + .max_register = MDIO_REGMAP_PHY_ADDR | MDIO_REGMAP_PHY_REG, + .reg_read = an8855_regmap_phy_read, + .reg_write = an8855_regmap_phy_write, + .disable_locking = true, +}; + +static int an8855_read_switch_id(struct device *dev, struct regmap *regmap) +{ + u32 id; + int ret; + + ret = regmap_read(regmap, AN8855_CREV, &id); + if (ret) + return ret; + + if (id != AN8855_ID) { + dev_err(dev, "Switch ID detected %x but expected %x\n", + id, AN8855_ID); + return -ENODEV; + } + + return 0; +} + +static int an8855_mfd_probe(struct mdio_device *mdiodev) +{ + struct regmap *regmap, *regmap_phy; + struct device *dev = &mdiodev->dev; + struct an8855_mfd_priv *priv; + struct gpio_desc *reset_gpio; + u32 val; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->bus = mdiodev->bus; + priv->switch_addr = mdiodev->addr; + /* no DMA for mdiobus, mute warning for DMA mask not set */ + dev->dma_mask = &dev->coherent_dma_mask; + + regmap = devm_regmap_init(dev, NULL, priv, &an8855_regmap_config); + if (IS_ERR(regmap)) + return dev_err_probe(dev, PTR_ERR(regmap), + "regmap initialization failed\n"); + + regmap_phy = devm_regmap_init(dev, NULL, priv, &an8855_regmap_phy_config); + if (IS_ERR(regmap_phy)) + return dev_err_probe(dev, PTR_ERR(regmap_phy), + "regmap phy initialization failed\n"); + + reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(reset_gpio)) + return PTR_ERR(reset_gpio); + + if (reset_gpio) { + usleep_range(100000, 150000); + gpiod_set_value_cansleep(reset_gpio, 0); + usleep_range(100000, 150000); + gpiod_set_value_cansleep(reset_gpio, 1); + + /* Poll HWTRAP reg to wait for Switch to fully Init */ + ret = regmap_read_poll_timeout(regmap, AN8855_HWTRAP, val, + val, 20, 200000); + if (ret) + return ret; + } + + ret = an8855_read_switch_id(dev, regmap); + if (ret) + return ret; + + /* Release global PHY power down */ + ret = regmap_write(regmap, AN8855_RG_GPHY_AFE_PWD, 0x0); + if (ret) + return ret; + + return devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, an8855_mfd_devs, + ARRAY_SIZE(an8855_mfd_devs), NULL, 0, + NULL); +} + +static const struct of_device_id an8855_mfd_of_match[] = { + { .compatible = "airoha,an8855" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, an8855_mfd_of_match); + +static struct mdio_driver an8855_mfd_driver = { + .probe = an8855_mfd_probe, + .mdiodrv.driver = { + .name = "an8855", + .of_match_table = an8855_mfd_of_match, + }, +}; +mdio_module_driver(an8855_mfd_driver); + +MODULE_AUTHOR("Christian Marangi "); +MODULE_DESCRIPTION("Driver for Airoha AN8855 MFD"); +MODULE_LICENSE("GPL");