Add support for MMIO register MDIO muxes based on the Linux mdio-mux-mmioreg driver.
Signed-off-by: Neil Armstrong narmstrong@baylibre.com --- drivers/net/Kconfig | 7 ++ drivers/net/Makefile | 1 + drivers/net/mdio_mux_mmioreg.c | 129 +++++++++++++++++++++++++++++++++ 3 files changed, 137 insertions(+) create mode 100644 drivers/net/mdio_mux_mmioreg.c
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index 0e84c22b50..41fa2fe566 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -790,4 +790,11 @@ config FSL_LS_MDIO This driver supports the MDIO bus found on the Fman 10G Ethernet MACs and on the mEMAC (which supports both Clauses 22 and 45).
+config MDIO_MUX_MMIOREG + bool "MDIO MUX accessed as a MMIO register access" + depends on DM_MDIO_MUX + help + This driver is used for MDIO muxes driven by writing to a register in + the MMIO physical memory. + endif # NETDEVICES diff --git a/drivers/net/Makefile b/drivers/net/Makefile index a19511aaa7..511c87c3a5 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile @@ -43,6 +43,7 @@ obj-$(CONFIG_MACB) += macb.o obj-$(CONFIG_MCFFEC) += mcffec.o mcfmii.o obj-$(CONFIG_MDIO_IPQ4019) += mdio-ipq4019.o obj-$(CONFIG_MDIO_MUX_I2CREG) += mdio_mux_i2creg.o +obj-$(CONFIG_MDIO_MUX_MMIOREG) += mdio_mux_mmioreg.o obj-$(CONFIG_MDIO_MUX_SANDBOX) += mdio_mux_sandbox.o obj-$(CONFIG_MPC8XX_FEC) += mpc8xx_fec.o obj-$(CONFIG_MT7620_ETH) += mt7620-eth.o diff --git a/drivers/net/mdio_mux_mmioreg.c b/drivers/net/mdio_mux_mmioreg.c new file mode 100644 index 0000000000..e1a23e40a2 --- /dev/null +++ b/drivers/net/mdio_mux_mmioreg.c @@ -0,0 +1,129 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * (C) Copyright 2021 BayLibre, SAS + * Author: Neil Armstrong narmstrong@baylibre.com + * + * Based on linux/drivers/net/phy/mdio-mux-mmioreg.c : + * Copyright 2012 Freescale Semiconductor, Inc. + */ + +#include <dm.h> +#include <errno.h> +#include <log.h> +#include <miiphy.h> +#include <linux/io.h> + +struct mdio_mux_mmioreg_priv { + struct udevice *chip; + phys_addr_t phys; + unsigned int iosize; + unsigned int mask; +}; + +static int mdio_mux_mmioreg_select(struct udevice *mux, int cur, int sel) +{ + struct mdio_mux_mmioreg_priv *priv = dev_get_priv(mux); + + debug("%s: %x -> %x\n", __func__, (u32)cur, (u32)sel); + + /* if last selection didn't change we're good to go */ + if (cur == sel) + return 0; + + switch (priv->iosize) { + case sizeof(u8): { + u8 x, y; + + x = ioread8((void *)priv->phys); + y = (x & ~priv->mask) | (u32)sel; + if (x != y) { + iowrite8((x & ~priv->mask) | sel, (void *)priv->phys); + debug("%s: %02x -> %02x\n", __func__, x, y); + } + + break; + } + case sizeof(u16): { + u16 x, y; + + x = ioread16((void *)priv->phys); + y = (x & ~priv->mask) | (u32)sel; + if (x != y) { + iowrite16((x & ~priv->mask) | sel, (void *)priv->phys); + debug("%s: %04x -> %04x\n", __func__, x, y); + } + + break; + } + case sizeof(u32): { + u32 x, y; + + x = ioread32((void *)priv->phys); + y = (x & ~priv->mask) | (u32)sel; + if (x != y) { + iowrite32((x & ~priv->mask) | sel, (void *)priv->phys); + debug("%s: %08x -> %08x\n", __func__, x, y); + } + + break; + } + } + + return 0; +} + +static const struct mdio_mux_ops mdio_mux_mmioreg_ops = { + .select = mdio_mux_mmioreg_select, +}; + +static int mdio_mux_mmioreg_probe(struct udevice *dev) +{ + struct mdio_mux_mmioreg_priv *priv = dev_get_priv(dev); + phys_addr_t reg_base, reg_size; + u32 reg_mask; + int err; + + reg_base = ofnode_get_addr_size_index(dev_ofnode(dev), 0, ®_size); + if (reg_base == FDT_ADDR_T_NONE) + return -EINVAL; + + if (reg_size != sizeof(u8) && + reg_size != sizeof(u16) && + reg_size != sizeof(u32)) { + printf("%s: only 8/16/32-bit registers are supported\n", __func__); + return -EINVAL; + } + + err = dev_read_u32(dev, "mux-mask", ®_mask); + if (err) { + debug("%s: error reading mux-mask property\n", __func__); + return err; + } + + if (reg_mask >= BIT(reg_size * 8)) { + printf("%s: mask doesn't fix in register width\n", __func__); + return -EINVAL; + } + + priv->phys = reg_base; + priv->iosize = reg_size; + priv->mask = reg_mask; + + debug("%s: %llx@%lld / %x\n", __func__, reg_base, reg_size, reg_mask); + + return 0; +} + +static const struct udevice_id mdio_mux_mmioreg_ids[] = { + { .compatible = "mdio-mux-mmioreg" }, + { } +}; + +U_BOOT_DRIVER(mdio_mux_mmioreg) = { + .name = "mdio_mux_mmioreg", + .id = UCLASS_MDIO_MUX, + .of_match = mdio_mux_mmioreg_ids, + .probe = mdio_mux_mmioreg_probe, + .ops = &mdio_mux_mmioreg_ops, + .priv_auto = sizeof(struct mdio_mux_mmioreg_priv), +};