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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2026 David Yang
*/
#include <linux/iopoll.h>
#include "chip.h"
#include "smi.h"
#define YT921X_POLL_SLEEP_US 10000
#define YT921X_POLL_TIMEOUT_US 100000
int yt921x_reg_read(struct yt921x_priv *priv, u32 reg, u32 *valp)
{
lockdep_assert_held_once(&priv->reg_lock);
return priv->reg_ops->read(priv->reg_ctx, reg, valp);
}
int yt921x_reg_write(struct yt921x_priv *priv, u32 reg, u32 val)
{
lockdep_assert_held_once(&priv->reg_lock);
return priv->reg_ops->write(priv->reg_ctx, reg, val);
}
int yt921x_reg_wait(struct yt921x_priv *priv, u32 reg, u32 mask, u32 *valp)
{
u32 val;
int res;
int ret;
ret = read_poll_timeout(yt921x_reg_read, res,
res || (val & mask) == *valp,
YT921X_POLL_SLEEP_US, YT921X_POLL_TIMEOUT_US,
false, priv, reg, &val);
if (ret)
return ret;
if (res)
return res;
*valp = val;
return 0;
}
int yt921x_reg_update_bits(struct yt921x_priv *priv, u32 reg, u32 mask, u32 val)
{
int res;
u32 v;
u32 u;
res = yt921x_reg_read(priv, reg, &v);
if (res)
return res;
u = v;
u &= ~mask;
u |= val;
if (u == v)
return 0;
return yt921x_reg_write(priv, reg, u);
}
static int
yt921x_regs_read(struct yt921x_priv *priv, u32 reg, u32 *vals,
unsigned int num_regs)
{
int res;
for (unsigned int i = 0; i < num_regs; i++) {
res = yt921x_reg_read(priv, reg + 4 * i, &vals[i]);
if (res)
return res;
}
return 0;
}
static int
yt921x_regs_write(struct yt921x_priv *priv, u32 reg, const u32 *vals,
unsigned int num_regs)
{
int res;
for (unsigned int i = 0; i < num_regs; i++) {
res = yt921x_reg_write(priv, reg + 4 * i, vals[i]);
if (res)
return res;
}
return 0;
}
static int
yt921x_regs_update_bits(struct yt921x_priv *priv, u32 reg, const u32 *masks,
const u32 *vals, unsigned int num_regs)
{
bool changed = false;
u32 vs[4];
int res;
BUILD_BUG_ON(num_regs > ARRAY_SIZE(vs));
res = yt921x_regs_read(priv, reg, vs, num_regs);
if (res)
return res;
for (unsigned int i = 0; i < num_regs; i++) {
u32 u = vs[i];
u &= ~masks[i];
u |= vals[i];
if (u != vs[i])
changed = true;
vs[i] = u;
}
if (!changed)
return 0;
return yt921x_regs_write(priv, reg, vs, num_regs);
}
static int
yt921x_regs_clear_bits(struct yt921x_priv *priv, u32 reg, const u32 *masks,
unsigned int num_regs)
{
bool changed = false;
u32 vs[4];
int res;
BUILD_BUG_ON(num_regs > ARRAY_SIZE(vs));
res = yt921x_regs_read(priv, reg, vs, num_regs);
if (res)
return res;
for (unsigned int i = 0; i < num_regs; i++) {
u32 u = vs[i];
u &= ~masks[i];
if (u != vs[i])
changed = true;
vs[i] = u;
}
if (!changed)
return 0;
return yt921x_regs_write(priv, reg, vs, num_regs);
}
int
yt921x_reg64_write(struct yt921x_priv *priv, u32 reg, const u32 *vals)
{
return yt921x_regs_write(priv, reg, vals, 2);
}
int
yt921x_reg64_update_bits(struct yt921x_priv *priv, u32 reg, const u32 *masks,
const u32 *vals)
{
return yt921x_regs_update_bits(priv, reg, masks, vals, 2);
}
int
yt921x_reg64_clear_bits(struct yt921x_priv *priv, u32 reg, const u32 *masks)
{
return yt921x_regs_clear_bits(priv, reg, masks, 2);
}
int
yt921x_reg96_write(struct yt921x_priv *priv, u32 reg, const u32 *vals)
{
return yt921x_regs_write(priv, reg, vals, 3);
}
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