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clk: uniphier: rework UniPhier clk driver

Browse source 
The initial design of the UniPhier clk driver for U-Boot was not
very nice.  Here is a re-work to sync it with Linux's clk and reset
drivers, maximizing the code reuse from Linux's clk data.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2016-10-17 22:18:01 +09:00
parent f666a65824
commit 805dc44cc8
5 changed files with 208 additions and 269 deletions
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15
drivers/clk/uniphier/Kconfig
View file

@ -1,13 +1,10 @@
config CLK_UNIPHIER
bool
bool "Clock driver for UniPhier SoCs"
depends on ARCH_UNIPHIER
select CLK
select SPL_CLK
menu "Clock drivers for UniPhier SoCs"
depends on CLK_UNIPHIER
config CLK_UNIPHIER_MIO
bool "Clock driver for UniPhier Media I/O block"
default y
endmenu
help
Support for clock controllers on UniPhier SoCs.
Say Y if you want to control clocks provided by System Control
block, Media I/O block, Peripheral Block.

5
drivers/clk/uniphier/Makefile
View file

@ -1,3 +1,2 @@
obj-y += clk-uniphier-core.o
obj-$(CONFIG_CLK_UNIPHIER_MIO) += clk-uniphier-mio.o
obj-y += clk-uniphier-core.o
obj-y += clk-uniphier-mio.o

228
drivers/clk/uniphier/clk-uniphier-core.c
View file

@ -6,11 +6,11 @@
*/
#include <common.h>
#include <clk-uclass.h>
#include <dm/device.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"
@ -18,14 +18,116 @@
* struct uniphier_clk_priv - private data for UniPhier clock driver
*
* @base: base address of the clock provider
* @socdata: SoC specific data
* @data: SoC specific data
*/
struct uniphier_clk_priv {
void __iomem *base;
const struct uniphier_clk_soc_data *socdata;
const struct uniphier_clk_data *data;
};
int uniphier_clk_probe(struct udevice *dev)
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;
@ -38,125 +140,11 @@ int uniphier_clk_probe(struct udevice *dev)
if (!priv->base)
return -ENOMEM;
priv->socdata = (void *)dev_get_driver_data(dev);
priv->data = (void *)dev_get_driver_data(dev);
return 0;
}
static int uniphier_clk_enable(struct clk *clk)
{
struct uniphier_clk_priv *priv = dev_get_priv(clk->dev);
const 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);
const 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);
const 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,
};
static const struct udevice_id uniphier_clk_match[] = {
{
.compatible = "socionext,uniphier-sld3-mio-clock",

183
drivers/clk/uniphier/clk-uniphier-mio.c
View file

@ -5,136 +5,81 @@
* SPDX-License-Identifier: GPL-2.0+
*/
#include <dm/device.h>
#include "clk-uniphier.h"
#define UNIPHIER_MIO_CLK_GATE_SD(ch, idx) \
{ \
.index = (idx), \
.reg = 0x20 + 0x200 * (ch), \
.mask = 0x00000100, \
.data = 0x00000100, \
}, \
{ \
.index = (idx), \
.reg = 0x110 + 0x200 * (ch), \
.mask = 0x00000001, \
.data = 0x00000001, \
}
#define UNIPHIER_MIO_CLK_SD_GATE(id, ch) \
UNIPHIER_CLK_GATE((id), 0x20 + 0x200 * (ch), 8)
#define UNIPHIER_MIO_CLK_RATE_SD(ch, idx) \
{ \
.index = (idx), \
.reg = 0x30 + 0x200 * (ch), \
.mask = 0x00031300, \
.data = 0x00000000, \
.rate = 44444444, \
}, \
{ \
.index = (idx), \
.reg = 0x30 + 0x200 * (ch), \
.mask = 0x00031300, \
.data = 0x00010000, \
.rate = 33333333, \
}, \
{ \
.index = (idx), \
.reg = 0x30 + 0x200 * (ch), \
.mask = 0x00031300, \
.data = 0x00020000, \
.rate = 50000000, \
}, \
{ \
.index = (idx), \
.reg = 0x30 + 0x200 * (ch), \
.mask = 0x00031300, \
.data = 0x00020000, \
.rate = 66666666, \
}, \
{ \
.index = (idx), \
.reg = 0x30 + 0x200 * (ch), \
.mask = 0x00031300, \
.data = 0x00001000, \
.rate = 100000000, \
}, \
{ \
.index = (idx), \
.reg = 0x30 + 0x200 * (ch), \
.mask = 0x00031300, \
.data = 0x00001100, \
.rate = 40000000, \
}, \
{ \
.index = (idx), \
.reg = 0x30 + 0x200 * (ch), \
.mask = 0x00031300, \
.data = 0x00001200, \
.rate = 25000000, \
}, \
{ \
.index = (idx), \
.reg = 0x30 + 0x200 * (ch), \
.mask = 0x00031300, \
.data = 0x00001300, \
.rate = 22222222, \
}
#define UNIPHIER_MIO_CLK_USB2(id, ch) \
UNIPHIER_CLK_GATE((id), 0x20 + 0x200 * (ch), 28)
#define UNIPHIER_MIO_CLK_GATE_USB(ch, idx) \
{ \
.index = (idx), \
.reg = 0x20 + 0x200 * (ch), \
.mask = 0x30000000, \
.data = 0x30000000, \
}, \
{ \
.index = (idx), \
.reg = 0x110 + 0x200 * (ch), \
.mask = 0x01000000, \
.data = 0x01000000, \
}, \
{ \
.index = (idx), \
.reg = 0x114 + 0x200 * (ch), \
.mask = 0x00000001, \
.data = 0x00000001, \
}
#define UNIPHIER_MIO_CLK_USB2_PHY(id, ch) \
UNIPHIER_CLK_GATE((id), 0x20 + 0x200 * (ch), 29)
#define UNIPHIER_MIO_CLK_GATE_DMAC(idx) \
{ \
.index = (idx), \
.reg = 0x20, \
.mask = 0x02000000, \
.data = 0x02000000, \
}, \
{ \
.index = (idx), \
.reg = 0x110, \
.mask = 0x00020000, \
.data = 0x00020000, \
#define UNIPHIER_MIO_CLK_DMAC(id) \
UNIPHIER_CLK_GATE((id), 0x20, 25)
#define UNIPHIER_MIO_CLK_SD_MUX(_id, ch) \
{ \
.id = (_id), \
.nr_muxs = 8, \
.reg = 0x30 + 0x200 * (ch), \
.masks = { \
0x00031000, \
0x00031000, \
0x00031000, \
0x00031000, \
0x00001300, \
0x00001300, \
0x00001300, \
0x00001300, \
}, \
.vals = { \
0x00000000, \
0x00010000, \
0x00020000, \
0x00030000, \
0x00001000, \
0x00001100, \
0x00001200, \
0x00001300, \
}, \
.rates = { \
44444444, \
33333333, \
50000000, \
66666666, \
100000000, \
40000000, \
25000000, \
22222222, \
}, \
}
static const struct uniphier_clk_gate_data uniphier_mio_clk_gate[] = {
UNIPHIER_MIO_CLK_GATE_SD(0, 0),
UNIPHIER_MIO_CLK_GATE_SD(1, 1),
UNIPHIER_MIO_CLK_GATE_SD(2, 2), /* for PH1-Pro4 only */
UNIPHIER_MIO_CLK_GATE_USB(0, 3),
UNIPHIER_MIO_CLK_GATE_USB(1, 4),
UNIPHIER_MIO_CLK_GATE_USB(2, 5),
UNIPHIER_MIO_CLK_GATE_DMAC(6),
UNIPHIER_MIO_CLK_GATE_USB(3, 7), /* for PH1-sLD3 only */
UNIPHIER_MIO_CLK_SD_GATE(0, 0),
UNIPHIER_MIO_CLK_SD_GATE(1, 1),
UNIPHIER_MIO_CLK_SD_GATE(2, 2), /* for PH1-Pro4 only */
UNIPHIER_MIO_CLK_DMAC(7),
UNIPHIER_MIO_CLK_USB2(8, 0),
UNIPHIER_MIO_CLK_USB2(9, 1),
UNIPHIER_MIO_CLK_USB2(10, 2),
UNIPHIER_MIO_CLK_USB2(11, 3), /* for PH1-sLD3 only */
UNIPHIER_MIO_CLK_USB2_PHY(12, 0),
UNIPHIER_MIO_CLK_USB2_PHY(13, 1),
UNIPHIER_MIO_CLK_USB2_PHY(14, 2),
UNIPHIER_MIO_CLK_USB2_PHY(15, 3), /* for PH1-sLD3 only */
UNIPHIER_CLK_END
};
static const struct uniphier_clk_rate_data uniphier_mio_clk_rate[] = {
UNIPHIER_MIO_CLK_RATE_SD(0, 0),
UNIPHIER_MIO_CLK_RATE_SD(1, 1),
UNIPHIER_MIO_CLK_RATE_SD(2, 2), /* for PH1-Pro4 only */
static const struct uniphier_clk_mux_data uniphier_mio_clk_mux[] = {
UNIPHIER_MIO_CLK_SD_MUX(0, 0),
UNIPHIER_MIO_CLK_SD_MUX(1, 1),
UNIPHIER_MIO_CLK_SD_MUX(2, 2), /* for PH1-Pro4 only */
UNIPHIER_CLK_END
};
const struct uniphier_clk_soc_data uniphier_mio_clk_data = {
const struct uniphier_clk_data uniphier_mio_clk_data = {
.gate = uniphier_mio_clk_gate,
.nr_gate = ARRAY_SIZE(uniphier_mio_clk_gate),
.rate = uniphier_mio_clk_rate,
.nr_rate = ARRAY_SIZE(uniphier_mio_clk_rate),
.mux = uniphier_mio_clk_mux,
};

46
drivers/clk/uniphier/clk-uniphier.h
View file

@ -10,36 +10,46 @@
#include <linux/kernel.h>
#define UNIPHIER_CLK_MAX_NR_MUXS 8
struct uniphier_clk_gate_data {
int index;
unsigned int id;
unsigned int reg;
u32 mask;
u32 data;
unsigned int bit;
};
struct uniphier_clk_rate_data {
int index;
struct uniphier_clk_mux_data {
unsigned int id;
unsigned int nr_muxs;
unsigned int reg;
#define UNIPHIER_CLK_RATE_IS_FIXED UINT_MAX
u32 mask;
u32 data;
unsigned long rate;
unsigned int masks[UNIPHIER_CLK_MAX_NR_MUXS];
unsigned int vals[UNIPHIER_CLK_MAX_NR_MUXS];
unsigned long rates[UNIPHIER_CLK_MAX_NR_MUXS];
};
struct uniphier_clk_soc_data {
struct uniphier_clk_data {
const struct uniphier_clk_gate_data *gate;
unsigned int nr_gate;
const struct uniphier_clk_rate_data *rate;
unsigned int nr_rate;
const struct uniphier_clk_mux_data *mux;
};
#define UNIPHIER_CLK_FIXED_RATE(i, f) \
#define UNIPHIER_CLK_ID_END (unsigned int)(-1)
#define UNIPHIER_CLK_END \
{ .id = UNIPHIER_CLK_ID_END }
#define UNIPHIER_CLK_GATE(_id, _reg, _bit) \
{ \
.index = i, \
.reg = UNIPHIER_CLK_RATE_IS_FIXED, \
.rate = f, \
.id = (_id), \
.reg = (_reg), \
.bit = (_bit), \
}
extern const struct uniphier_clk_soc_data uniphier_mio_clk_data;
#define UNIPHIER_CLK_FIXED_RATE(_id, _rate) \
{ \
.id = (_id), \
.rates = {(_reg),}, \
}
extern const struct uniphier_clk_data uniphier_mio_clk_data;
#endif /* __CLK_UNIPHIER_H__ */