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- // 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),
- };
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