mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-19 19:28:36 +00:00
4e3d84066e
This does not have much impact on behavior, but makes code look more more like Linux. The use of devm_ioremap() often helps to delete .remove callbacks entirely. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
147 lines
3.2 KiB
C
147 lines
3.2 KiB
C
/*
|
|
* 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;
|
|
}
|