mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-14 23:33:00 +00:00
6c7bc9fec0
Add support for MMIO register MDIO muxes based on the Linux mdio-mux-mmioreg driver. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
129 lines
2.8 KiB
C
129 lines
2.8 KiB
C
// 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),
|
|
};
|