mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-16 01:38:22 +00:00
0fd3d91152
Most drivers use these access methods but a few do not. Update them. In some cases the access is not permitted, so mark those with a FIXME tag for the maintainer to check. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Pratyush Yadav <p.yadav@ti.com>
143 lines
3.4 KiB
C
143 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,
|
|
};
|