1 // SPDX-License-Identifier: GPL-2.0
3 * (C) Copyright 2021 BayLibre, SAS
4 * Author: Neil Armstrong <narmstrong@baylibre.com>
6 * Based on linux/drivers/net/phy/mdio-mux-mmioreg.c :
7 * Copyright 2012 Freescale Semiconductor, Inc.
16 struct mdio_mux_mmioreg_priv {
23 static int mdio_mux_mmioreg_select(struct udevice *mux, int cur, int sel)
25 struct mdio_mux_mmioreg_priv *priv = dev_get_priv(mux);
27 debug("%s: %x -> %x\n", __func__, (u32)cur, (u32)sel);
29 /* if last selection didn't change we're good to go */
33 switch (priv->iosize) {
37 x = ioread8((void *)priv->phys);
38 y = (x & ~priv->mask) | (u32)sel;
40 iowrite8((x & ~priv->mask) | sel, (void *)priv->phys);
41 debug("%s: %02x -> %02x\n", __func__, x, y);
49 x = ioread16((void *)priv->phys);
50 y = (x & ~priv->mask) | (u32)sel;
52 iowrite16((x & ~priv->mask) | sel, (void *)priv->phys);
53 debug("%s: %04x -> %04x\n", __func__, x, y);
61 x = ioread32((void *)priv->phys);
62 y = (x & ~priv->mask) | (u32)sel;
64 iowrite32((x & ~priv->mask) | sel, (void *)priv->phys);
65 debug("%s: %08x -> %08x\n", __func__, x, y);
75 static const struct mdio_mux_ops mdio_mux_mmioreg_ops = {
76 .select = mdio_mux_mmioreg_select,
79 static int mdio_mux_mmioreg_probe(struct udevice *dev)
81 struct mdio_mux_mmioreg_priv *priv = dev_get_priv(dev);
82 phys_addr_t reg_base, reg_size;
86 reg_base = ofnode_get_addr_size_index(dev_ofnode(dev), 0, ®_size);
87 if (reg_base == FDT_ADDR_T_NONE)
90 if (reg_size != sizeof(u8) &&
91 reg_size != sizeof(u16) &&
92 reg_size != sizeof(u32)) {
93 printf("%s: only 8/16/32-bit registers are supported\n", __func__);
97 err = dev_read_u32(dev, "mux-mask", ®_mask);
99 debug("%s: error reading mux-mask property\n", __func__);
103 if (reg_mask >= BIT(reg_size * 8)) {
104 printf("%s: mask doesn't fix in register width\n", __func__);
108 priv->phys = reg_base;
109 priv->iosize = reg_size;
110 priv->mask = reg_mask;
112 debug("%s: %llx@%lld / %x\n", __func__, reg_base, reg_size, reg_mask);
117 static const struct udevice_id mdio_mux_mmioreg_ids[] = {
118 { .compatible = "mdio-mux-mmioreg" },
122 U_BOOT_DRIVER(mdio_mux_mmioreg) = {
123 .name = "mdio_mux_mmioreg",
124 .id = UCLASS_MDIO_MUX,
125 .of_match = mdio_mux_mmioreg_ids,
126 .probe = mdio_mux_mmioreg_probe,
127 .ops = &mdio_mux_mmioreg_ops,
128 .priv_auto = sizeof(struct mdio_mux_mmioreg_priv),