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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 <linux/bitops.h>
#include <linux/io.h>
#include <linux/sizes.h>
#include <clk-uclass.h>
#include <dm/device.h>
#include "clk-uniphier.h"
static int uniphier_clk_enable(struct clk *clk)
{
struct uniphier_clk_priv *priv = dev_get_priv(clk->dev);
struct uniphier_clk_gate_data *gate = priv->socdata->gate;
unsigned int nr_gate = priv->socdata->nr_gate;
void __iomem *reg;
u32 mask, data, tmp;
int i;
for (i = 0; i < nr_gate; i++) {
if (gate[i].index != clk->id)
continue;
reg = priv->base + gate[i].reg;
mask = gate[i].mask;
data = gate[i].data & mask;
tmp = readl(reg);
tmp &= ~mask;
tmp |= data & mask;
debug("%s: %p: %08x\n", __func__, reg, tmp);
writel(tmp, reg);
}
return 0;
}
static ulong uniphier_clk_get_rate(struct clk *clk)
{
struct uniphier_clk_priv *priv = dev_get_priv(clk->dev);
struct uniphier_clk_rate_data *rdata = priv->socdata->rate;
unsigned int nr_rdata = priv->socdata->nr_rate;
void __iomem *reg;
u32 mask, data;
ulong matched_rate = 0;
int i;
for (i = 0; i < nr_rdata; i++) {
if (rdata[i].index != clk->id)
continue;
if (rdata[i].reg == UNIPHIER_CLK_RATE_IS_FIXED)
return rdata[i].rate;
reg = priv->base + rdata[i].reg;
mask = rdata[i].mask;
data = rdata[i].data & mask;
if ((readl(reg) & mask) == data) {
if (matched_rate && rdata[i].rate != matched_rate) {
printf("failed to get clk rate for insane register values\n");
return -EINVAL;
}
matched_rate = rdata[i].rate;
}
}
debug("%s: rate = %lu\n", __func__, matched_rate);
return matched_rate;
}
static ulong uniphier_clk_set_rate(struct clk *clk, ulong rate)
{
struct uniphier_clk_priv *priv = dev_get_priv(clk->dev);
struct uniphier_clk_rate_data *rdata = priv->socdata->rate;
unsigned int nr_rdata = priv->socdata->nr_rate;
void __iomem *reg;
u32 mask, data, tmp;
ulong best_rate = 0;
int i;
/* first, decide the best match rate */
for (i = 0; i < nr_rdata; i++) {
if (rdata[i].index != clk->id)
continue;
if (rdata[i].reg == UNIPHIER_CLK_RATE_IS_FIXED)
return 0;
if (rdata[i].rate > best_rate && rdata[i].rate <= rate)
best_rate = rdata[i].rate;
}
if (!best_rate)
return -ENODEV;
debug("%s: requested rate = %lu, set rate = %lu\n", __func__,
rate, best_rate);
/* second, really set registers */
for (i = 0; i < nr_rdata; i++) {
if (rdata[i].index != clk->id || rdata[i].rate != best_rate)
continue;
reg = priv->base + rdata[i].reg;
mask = rdata[i].mask;
data = rdata[i].data & mask;
tmp = readl(reg);
tmp &= ~mask;
tmp |= data;
debug("%s: %p: %08x\n", __func__, reg, tmp);
writel(tmp, reg);
}
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,
};
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);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
priv->base = devm_ioremap(dev, addr, SZ_4K);
if (!priv->base)
return -ENOMEM;
priv->socdata = (void *)dev_get_driver_data(dev);
return 0;
}
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