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/*
* Copyright (C) 2016 Socionext Inc.
* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <clk-uclass.h>
#include <dm.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/sizes.h>
#include "clk-uniphier.h"
/**
* struct uniphier_clk_priv - private data for UniPhier clock driver
*
* @base: base address of the clock provider
* @data: SoC specific data
*/
struct uniphier_clk_priv {
void __iomem *base;
const struct uniphier_clk_data *data;
};
static int uniphier_clk_enable(struct clk *clk)
{
struct uniphier_clk_priv *priv = dev_get_priv(clk->dev);
unsigned long id = clk->id;
const struct uniphier_clk_gate_data *p;
for (p = priv->data->gate; p->id != UNIPHIER_CLK_ID_END; p++) {
u32 val;
if (p->id != id)
continue;
val = readl(priv->base + p->reg);
val |= BIT(p->bit);
writel(val, priv->base + p->reg);
return 0;
}
dev_err(priv->dev, "clk_id=%lu was not handled\n", id);
return -EINVAL;
}
static const struct uniphier_clk_mux_data *
uniphier_clk_get_mux_data(struct uniphier_clk_priv *priv, unsigned long id)
{
const struct uniphier_clk_mux_data *p;
for (p = priv->data->mux; p->id != UNIPHIER_CLK_ID_END; p++) {
if (p->id == id)
return p;
}
return NULL;
}
static ulong uniphier_clk_get_rate(struct clk *clk)
{
struct uniphier_clk_priv *priv = dev_get_priv(clk->dev);
const struct uniphier_clk_mux_data *mux;
u32 val;
int i;
mux = uniphier_clk_get_mux_data(priv, clk->id);
if (!mux)
return 0;
if (!mux->nr_muxs) /* fixed-rate */
return mux->rates[0];
val = readl(priv->base + mux->reg);
for (i = 0; i < mux->nr_muxs; i++)
if ((mux->masks[i] & val) == mux->vals[i])
return mux->rates[i];
return -EINVAL;
}
static ulong uniphier_clk_set_rate(struct clk *clk, ulong rate)
{
struct uniphier_clk_priv *priv = dev_get_priv(clk->dev);
const struct uniphier_clk_mux_data *mux;
u32 val;
int i, best_rate_id = -1;
ulong best_rate = 0;
mux = uniphier_clk_get_mux_data(priv, clk->id);
if (!mux)
return 0;
if (!mux->nr_muxs) /* fixed-rate */
return mux->rates[0];
/* first, decide the best match rate */
for (i = 0; i < mux->nr_muxs; i++) {
if (mux->rates[i] > best_rate && mux->rates[i] <= rate) {
best_rate = mux->rates[i];
best_rate_id = i;
}
}
if (best_rate_id < 0)
return -EINVAL;
val = readl(priv->base + mux->reg);
val &= ~mux->masks[best_rate_id];
val |= mux->vals[best_rate_id];
writel(val, priv->base + mux->reg);
debug("%s: requested rate = %lu, set rate = %lu\n", __func__,
rate, best_rate);
return best_rate;
}
const struct clk_ops uniphier_clk_ops = {
.enable = uniphier_clk_enable,
.get_rate = uniphier_clk_get_rate,
.set_rate = uniphier_clk_set_rate,
};
static int uniphier_clk_probe(struct udevice *dev)
{
struct uniphier_clk_priv *priv = dev_get_priv(dev);
fdt_addr_t addr;
addr = dev_get_addr(dev->parent);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
priv->base = devm_ioremap(dev, addr, SZ_4K);
if (!priv->base)
return -ENOMEM;
priv->data = (void *)dev_get_driver_data(dev);
return 0;
}
static const struct udevice_id uniphier_clk_match[] = {
{
.compatible = "socionext,uniphier-sld3-mio-clock",
.data = (ulong)&uniphier_mio_clk_data,
},
{
.compatible = "socionext,uniphier-ld4-mio-clock",
.data = (ulong)&uniphier_mio_clk_data,
},
{
.compatible = "socionext,uniphier-pro4-mio-clock",
.data = (ulong)&uniphier_mio_clk_data,
},
{
.compatible = "socionext,uniphier-sld8-mio-clock",
.data = (ulong)&uniphier_mio_clk_data,
},
{
.compatible = "socionext,uniphier-pro5-sd-clock",
.data = (ulong)&uniphier_mio_clk_data,
},
{
.compatible = "socionext,uniphier-pxs2-sd-clock",
.data = (ulong)&uniphier_mio_clk_data,
},
{
.compatible = "socionext,uniphier-ld11-mio-clock",
.data = (ulong)&uniphier_mio_clk_data,
},
{
.compatible = "socionext,uniphier-ld20-sd-clock",
.data = (ulong)&uniphier_mio_clk_data,
},
{ /* sentinel */ }
};
U_BOOT_DRIVER(uniphier_clk) = {
.name = "uniphier-clk",
.id = UCLASS_CLK,
.of_match = uniphier_clk_match,
.probe = uniphier_clk_probe,
.priv_auto_alloc_size = sizeof(struct uniphier_clk_priv),
.ops = &uniphier_clk_ops,
};
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