mirror of
https://source.denx.de/u-boot/u-boot.git
synced 2025-08-09 16:56:58 +02:00
d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* MMIO register bitfield-controlled multiplexer driver
|
|
* Based on the linux mmio multiplexer driver
|
|
*
|
|
* Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
|
|
* Copyright (C) 2019 Texas Instrument, Jean-jacques Hiblot <jjhiblot@ti.com>
|
|
*/
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <mux-internal.h>
|
|
#include <regmap.h>
|
|
#include <syscon.h>
|
|
#include <dm/device.h>
|
|
#include <dm/device-internal.h>
|
|
#include <dm/device_compat.h>
|
|
#include <dm/read.h>
|
|
#include <dm/devres.h>
|
|
#include <dt-bindings/mux/mux.h>
|
|
#include <linux/bitops.h>
|
|
|
|
static int mux_mmio_set(struct mux_control *mux, int state)
|
|
{
|
|
struct regmap_field **fields = dev_get_priv(mux->dev);
|
|
|
|
return regmap_field_write(fields[mux_control_get_index(mux)], state);
|
|
}
|
|
|
|
static const struct mux_control_ops mux_mmio_ops = {
|
|
.set = mux_mmio_set,
|
|
};
|
|
|
|
static const struct udevice_id mmio_mux_of_match[] = {
|
|
{ .compatible = "mmio-mux" },
|
|
{ /* sentinel */ },
|
|
};
|
|
|
|
static int mmio_mux_probe(struct udevice *dev)
|
|
{
|
|
struct regmap_field **fields;
|
|
struct mux_chip *mux_chip = dev_get_uclass_priv(dev);
|
|
struct regmap *regmap;
|
|
u32 *mux_reg_masks;
|
|
u32 *idle_states;
|
|
int num_fields;
|
|
int ret;
|
|
int i;
|
|
|
|
regmap = syscon_node_to_regmap(dev_ofnode(dev->parent));
|
|
if (IS_ERR(regmap)) {
|
|
ret = PTR_ERR(regmap);
|
|
dev_err(dev, "failed to get regmap: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
num_fields = dev_read_size(dev, "mux-reg-masks");
|
|
if (num_fields < 0)
|
|
return log_msg_ret("mux-reg-masks missing", -EINVAL);
|
|
|
|
num_fields /= sizeof(u32);
|
|
if (num_fields == 0 || num_fields % 2)
|
|
ret = -EINVAL;
|
|
num_fields = num_fields / 2;
|
|
|
|
ret = mux_alloc_controllers(dev, num_fields);
|
|
if (ret < 0)
|
|
return log_msg_ret("mux_alloc_controllers", ret);
|
|
|
|
fields = devm_kmalloc(dev, num_fields * sizeof(*fields), __GFP_ZERO);
|
|
if (!fields)
|
|
return -ENOMEM;
|
|
dev_set_priv(dev, fields);
|
|
|
|
mux_reg_masks = devm_kmalloc(dev, num_fields * 2 * sizeof(u32),
|
|
__GFP_ZERO);
|
|
if (!mux_reg_masks)
|
|
return -ENOMEM;
|
|
|
|
ret = dev_read_u32_array(dev, "mux-reg-masks", mux_reg_masks,
|
|
num_fields * 2);
|
|
if (ret < 0)
|
|
return log_msg_ret("mux-reg-masks read", ret);
|
|
|
|
idle_states = devm_kmalloc(dev, num_fields * sizeof(u32), __GFP_ZERO);
|
|
if (!idle_states)
|
|
return -ENOMEM;
|
|
|
|
ret = dev_read_u32_array(dev, "idle-states", idle_states, num_fields);
|
|
if (ret < 0) {
|
|
log_err("idle-states");
|
|
devm_kfree(dev, idle_states);
|
|
idle_states = NULL;
|
|
}
|
|
|
|
for (i = 0; i < num_fields; i++) {
|
|
struct mux_control *mux = &mux_chip->mux[i];
|
|
struct reg_field field;
|
|
u32 reg, mask;
|
|
int bits;
|
|
|
|
reg = mux_reg_masks[2 * i];
|
|
mask = mux_reg_masks[2 * i + 1];
|
|
|
|
field.reg = reg;
|
|
field.msb = fls(mask) - 1;
|
|
field.lsb = ffs(mask) - 1;
|
|
|
|
if (mask != GENMASK(field.msb, field.lsb))
|
|
return log_msg_ret("invalid mask", -EINVAL);
|
|
|
|
fields[i] = devm_regmap_field_alloc(dev, regmap, field);
|
|
if (IS_ERR(fields[i])) {
|
|
ret = PTR_ERR(fields[i]);
|
|
return log_msg_ret("regmap_field_alloc", ret);
|
|
}
|
|
|
|
bits = 1 + field.msb - field.lsb;
|
|
mux->states = 1 << bits;
|
|
|
|
if (!idle_states)
|
|
continue;
|
|
|
|
if (idle_states[i] != MUX_IDLE_AS_IS &&
|
|
idle_states[i] >= mux->states)
|
|
return log_msg_ret("idle-states range", -EINVAL);
|
|
|
|
mux->idle_state = idle_states[i];
|
|
}
|
|
|
|
devm_kfree(dev, mux_reg_masks);
|
|
if (idle_states)
|
|
devm_kfree(dev, idle_states);
|
|
|
|
return 0;
|
|
}
|
|
|
|
U_BOOT_DRIVER(mmio_mux) = {
|
|
.name = "mmio-mux",
|
|
.id = UCLASS_MUX,
|
|
.of_match = mmio_mux_of_match,
|
|
.probe = mmio_mux_probe,
|
|
.ops = &mux_mmio_ops,
|
|
};
|