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Export clock states through debugfs

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SVN-Revision: 19383
This commit is contained in:
Lars-Peter Clausen 2010-01-29 20:12:27 +00:00
parent 7b5f0de029
commit ac5d8374d1
4 changed files with 259 additions and 55 deletions
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2
target/linux/xburst/files-2.6.32/arch/mips/jz4740/Makefile
View file

@ -7,6 +7,8 @@
obj-y += prom.o irq.o time.o reset.o setup.o dma.o \
gpio.o clock.o platform.o
obj-$(CONFIG_DEBUG_FS) += clock-debugfs.o
# board specific support
obj-$(CONFIG_JZ4740_QI_LB60) += board-qi_lb60.o

109
target/linux/xburst/files-2.6.32/arch/mips/jz4740/clock-debugfs.c Normal file
View file

@ -0,0 +1,109 @@
/*
* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
* JZ4740 SoC clock support debugfs entries
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <asm/mach-jz4740/clock.h>
#include "clock.h"
static struct dentry *jz4740_clock_debugfs;
static int jz4740_clock_debugfs_show_enabled(void *data, uint64_t *value)
{
struct clk *clk = data;
*value = clk_is_enabled(clk);
return 0;
}
static int jz4740_clock_debugfs_set_enabled(void *data, uint64_t value)
{
struct clk *clk = data;
if (value)
return clk_enable(clk);
else
clk_disable(clk);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_enabled,
jz4740_clock_debugfs_show_enabled,
jz4740_clock_debugfs_set_enabled,
"%llu\n");
static int jz4740_clock_debugfs_show_rate(void *data, uint64_t *value)
{
struct clk *clk = data;
*value = clk_get_rate(clk);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_rate,
jz4740_clock_debugfs_show_rate,
NULL,
"%llu\n");
void jz4740_clock_debugfs_add_clk(struct clk *clk)
{
if (!jz4740_clock_debugfs)
return;
clk->debugfs_entry = debugfs_create_dir(clk->name, jz4740_clock_debugfs);
debugfs_create_file("rate", S_IWUGO | S_IRUGO, clk->debugfs_entry, clk,
&jz4740_clock_debugfs_ops_rate);
debugfs_create_file("enabled", S_IRUGO, clk->debugfs_entry, clk,
&jz4740_clock_debugfs_ops_enabled);
if (clk->parent) {
char parent_path[100];
snprintf(parent_path, 100, "../%s", clk->parent->name);
clk->debugfs_parent_entry = debugfs_create_symlink("parent",
clk->debugfs_entry,
parent_path);
}
}
/* TODO: Locking */
void jz4740_clock_debugfs_update_parent(struct clk *clk)
{
if (clk->debugfs_parent_entry)
debugfs_remove(clk->debugfs_parent_entry);
if (clk->parent) {
char parent_path[100];
snprintf(parent_path, 100, "../%s", clk->parent->name);
clk->debugfs_parent_entry = debugfs_create_symlink("parent",
clk->debugfs_entry,
parent_path);
} else {
clk->debugfs_parent_entry = NULL;
}
}
void jz4740_clock_debugfs_init(void)
{
jz4740_clock_debugfs = debugfs_create_dir("jz4740-clock", NULL);
if (IS_ERR(jz4740_clock_debugfs))
jz4740_clock_debugfs = NULL;
}

141
target/linux/xburst/files-2.6.32/arch/mips/jz4740/clock.c
View file

@ -23,6 +23,7 @@
#include <linux/err.h>
#include <asm/mach-jz4740/clock.h>
#include "clock.h"
#define JZ_REG_CLOCK_CTRL 0x00
#define JZ_REG_CLOCK_LOW_POWER 0x04
@ -98,27 +99,6 @@ static void __iomem *jz_clock_base;
static spinlock_t jz_clock_lock;
static LIST_HEAD(jz_clocks);
struct clk_ops {
unsigned long (*get_rate)(struct clk* clk);
unsigned long (*round_rate)(struct clk *clk, unsigned long rate);
int (*set_rate)(struct clk* clk, unsigned long rate);
int (*enable)(struct clk* clk);
int (*disable)(struct clk* clk);
int (*set_parent)(struct clk* clk, struct clk *parent);
};
struct clk {
const char *name;
struct clk* parent;
uint32_t gate_bit;
const struct clk_ops *ops;
struct list_head list;
};
struct main_clk {
struct clk clk;
uint32_t div_offset;
@ -176,33 +156,51 @@ static void jz_clk_reg_clear_bits(int reg, uint32_t mask)
static int jz_clk_enable_gating(struct clk *clk)
{
if (clk->gate_bit == JZ4740_CLK_NOT_GATED)
return -EINVAL;
jz_clk_reg_clear_bits(JZ_REG_CLOCK_GATE, clk->gate_bit);
return 0;
}
static int jz_clk_disable_gating(struct clk *clk)
{
if (clk->gate_bit == JZ4740_CLK_NOT_GATED)
return -EINVAL;
jz_clk_reg_set_bits(JZ_REG_CLOCK_GATE, clk->gate_bit);
return 0;
}
static int jz_clk_is_enabled_gating(struct clk *clk)
{
if (clk->gate_bit == JZ4740_CLK_NOT_GATED)
return 1;
return !(jz_clk_reg_read(JZ_REG_CLOCK_GATE) & clk->gate_bit);
}
static unsigned long jz_clk_static_get_rate(struct clk *clk)
{
return ((struct static_clk*)clk)->rate;
}
static int jz_clk_ko_enable(struct clk* clk)
static int jz_clk_ko_enable(struct clk *clk)
{
jz_clk_reg_set_bits(JZ_REG_CLOCK_CTRL, JZ_CLOCK_CTRL_KO_ENABLE);
return 0;
}
static int jz_clk_ko_disable(struct clk* clk)
static int jz_clk_ko_disable(struct clk *clk)
{
jz_clk_reg_clear_bits(JZ_REG_CLOCK_CTRL, JZ_CLOCK_CTRL_KO_ENABLE);
return 0;
}
static int jz_clk_ko_is_enabled(struct clk *clk)
{
return !!(jz_clk_reg_read(JZ_REG_CLOCK_CTRL) & JZ_CLOCK_CTRL_KO_ENABLE);
}
static const int pllno[] = {1, 2, 2, 4};
@ -293,12 +291,13 @@ static struct clk_ops jz_clk_static_ops = {
.get_rate = jz_clk_static_get_rate,
.enable = jz_clk_enable_gating,
.disable = jz_clk_disable_gating,
.is_enabled = jz_clk_is_enabled_gating,
};
static struct static_clk jz_clk_ext = {
.clk = {
.name = "ext",
.gate_bit = (uint32_t)-1,
.gate_bit = JZ4740_CLK_NOT_GATED,
.ops = &jz_clk_static_ops,
},
};
@ -369,6 +368,7 @@ static struct main_clk jz_clk_low_speed_peripheral = {
static const struct clk_ops jz_clk_ko_ops = {
.enable = jz_clk_ko_enable,
.disable = jz_clk_ko_disable,
.is_enabled = jz_clk_ko_is_enabled,
};
static struct clk jz_clk_ko = {
@ -405,14 +405,6 @@ static int jz_clk_i2s_set_parent(struct clk *clk, struct clk *parent)
return 0;
}
static int jz_clk_udc_disable(struct clk *clk)
{
jz_clk_reg_clear_bits(JZ_REG_CLOCK_SLEEP_CTRL,
JZ_CLOCK_SLEEP_CTRL_ENABLE_UDC);
return 0;
}
static int jz_clk_udc_enable(struct clk *clk)
{
jz_clk_reg_set_bits(JZ_REG_CLOCK_SLEEP_CTRL,
@ -421,6 +413,19 @@ static int jz_clk_udc_enable(struct clk *clk)
return 0;
}
static int jz_clk_udc_disable(struct clk *clk)
{
jz_clk_reg_clear_bits(JZ_REG_CLOCK_SLEEP_CTRL,
JZ_CLOCK_SLEEP_CTRL_ENABLE_UDC);
return 0;
}
static int jz_clk_udc_is_enabled(struct clk *clk)
{
return !!(jz_clk_reg_read(JZ_REG_CLOCK_SLEEP_CTRL) &
JZ_CLOCK_SLEEP_CTRL_ENABLE_UDC);
}
static int jz_clk_udc_set_parent(struct clk *clk, struct clk *parent)
{
if (parent == &jz_clk_pll_half)
@ -551,23 +556,19 @@ static const struct clk_ops jz_clk_ops_ld = {
.set_rate = jz_clk_ldclk_set_rate,
.get_rate = jz_clk_ldclk_get_rate,
.round_rate = jz_clk_ldclk_round_rate,
.enable = jz_clk_enable_gating,
.disable = jz_clk_disable_gating,
.is_enabled = jz_clk_is_enabled_gating,
};
static struct clk jz_clk_ld = {
.name = "lcd",
.gate_bit = JZ_CLOCK_GATE_LCD,
.parent = &jz_clk_pll_half,
.ops= &jz_clk_ops_ld,
};
static struct divided_clk jz_clk_lp = {
.clk = {
.name = "lcd_pclk",
.parent = &jz_clk_pll_half,
},
.reg = JZ_REG_CLOCK_LCD,
.mask = JZ_CLOCK_LCD_DIV_MASK,
.ops = &jz_clk_ops_ld,
};
/* TODO: ops!!! */
static struct clk jz_clk_cim_mclk = {
.name = "cim_mclk",
.parent = &jz_clk_high_speed_peripheral.clk,
@ -587,6 +588,7 @@ static const struct clk_ops jz_clk_i2s_ops =
.get_rate = jz_clk_divided_get_rate,
.enable = jz_clk_enable_gating,
.disable = jz_clk_disable_gating,
.is_enabled = jz_clk_is_enabled_gating,
.set_parent = jz_clk_i2s_set_parent,
};
@ -596,6 +598,7 @@ static const struct clk_ops jz_clk_spi_ops =
.get_rate = jz_clk_divided_get_rate,
.enable = jz_clk_enable_gating,
.disable = jz_clk_disable_gating,
.is_enabled = jz_clk_is_enabled_gating,
.set_parent = jz_clk_spi_set_parent,
};
@ -605,9 +608,20 @@ static const struct clk_ops jz_clk_divided_ops =
.get_rate = jz_clk_divided_get_rate,
.enable = jz_clk_enable_gating,
.disable = jz_clk_disable_gating,
.is_enabled = jz_clk_is_enabled_gating,
};
static struct divided_clk jz4740_clock_divided_clks[] = {
{
.clk = {
.name = "lcd_pclk",
.parent = &jz_clk_pll_half,
.gate_bit = JZ4740_CLK_NOT_GATED,
.ops = &jz_clk_divided_ops,
},
.reg = JZ_REG_CLOCK_LCD,
.mask = JZ_CLOCK_LCD_DIV_MASK,
},
{
.clk = {
.name = "i2s",
@ -656,11 +670,13 @@ static const struct clk_ops jz_clk_udc_ops = {
.get_rate = jz_clk_udc_get_rate,
.enable = jz_clk_udc_enable,
.disable = jz_clk_udc_disable,
.is_enabled = jz_clk_udc_is_enabled,
};
static const struct clk_ops jz_clk_simple_ops = {
.enable = jz_clk_enable_gating,
.disable = jz_clk_disable_gating,
.is_enabled = jz_clk_is_enabled_gating,
};
static struct clk jz4740_clock_simple_clks[] = {
@ -732,6 +748,14 @@ void clk_disable(struct clk *clk)
}
EXPORT_SYMBOL_GPL(clk_disable);
int clk_is_enabled(struct clk *clk)
{
if (clk->ops->is_enabled)
return clk->ops->is_enabled(clk);
return 1;
}
unsigned long clk_get_rate(struct clk *clk)
{
if (clk->ops->get_rate)
@ -771,6 +795,8 @@ int clk_set_parent(struct clk *clk, struct clk *parent)
ret = clk->ops->set_parent(clk, parent);
clk_enable(clk);
jz4740_clock_debugfs_update_parent(clk);
return ret;
}
EXPORT_SYMBOL_GPL(clk_set_parent);
@ -792,27 +818,29 @@ void clk_put(struct clk *clk)
}
EXPORT_SYMBOL_GPL(clk_put);
inline static void clk_add(struct clk *clk)
{
list_add_tail(&clk->list, &jz_clocks);
list_add_tail(&clk->list, &jz_clocks);
jz4740_clock_debugfs_add_clk(clk);
}
static void clk_register_clks(void)
{
size_t i;
clk_add(&jz_clk_ext.clk);
clk_add(&jz_clk_pll);
clk_add(&jz_clk_pll_half);
clk_add(&jz_clk_cpu.clk);
clk_add(&jz_clk_high_speed_peripheral.clk);
clk_add(&jz_clk_low_speed_peripheral.clk);
clk_add(&jz_clk_ko);
clk_add(&jz_clk_ld);
clk_add(&jz_clk_lp.clk);
clk_add(&jz_clk_cim_mclk);
clk_add(&jz_clk_cim_pclk.clk);
clk_add(&jz_clk_rtc.clk);
clk_add(&jz_clk_ext.clk);
clk_add(&jz_clk_pll);
clk_add(&jz_clk_pll_half);
clk_add(&jz_clk_cpu.clk);
clk_add(&jz_clk_high_speed_peripheral.clk);
clk_add(&jz_clk_low_speed_peripheral.clk);
clk_add(&jz_clk_ko);
clk_add(&jz_clk_ld);
clk_add(&jz_clk_cim_mclk);
clk_add(&jz_clk_cim_pclk.clk);
clk_add(&jz_clk_rtc.clk);
for (i = 0; i < ARRAY_SIZE(jz4740_clock_divided_clks); ++i)
clk_add(&jz4740_clock_divided_clks[i].clk);
@ -870,8 +898,11 @@ int jz_init_clocks(unsigned long ext_rate)
if (val & JZ_CLOCK_CTRL_UDC_SRC_PLL)
jz4740_clock_simple_clks[0].parent = &jz_clk_pll_half;
jz4740_clock_debugfs_init();
clk_register_clks();
return 0;
}
EXPORT_SYMBOL_GPL(jz_init_clocks);

62
target/linux/xburst/files-2.6.32/arch/mips/jz4740/clock.h Normal file
View file

@ -0,0 +1,62 @@
/*
* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
* JZ4740 SoC clock support
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifndef __JZ4740_CLOCK_H__
#define __JZ4740_CLOCK_H__
struct clk_ops {
unsigned long (*get_rate)(struct clk* clk);
unsigned long (*round_rate)(struct clk *clk, unsigned long rate);
int (*set_rate)(struct clk* clk, unsigned long rate);
int (*enable)(struct clk* clk);
int (*disable)(struct clk* clk);
int (*is_enabled)(struct clk* clk);
int (*set_parent)(struct clk* clk, struct clk *parent);
};
struct clk {
const char *name;
struct clk* parent;
uint32_t gate_bit;
const struct clk_ops *ops;
struct list_head list;
#ifdef CONFIG_DEBUG_FS
struct dentry *debugfs_entry;
struct dentry *debugfs_parent_entry;
#endif
};
#define JZ4740_CLK_NOT_GATED ((uint32_t)-1)
int clk_is_enabled(struct clk *clk);
#ifdef CONFIG_DEBUG_FS
void jz4740_clock_debugfs_init(void);
void jz4740_clock_debugfs_add_clk(struct clk *clk);
void jz4740_clock_debugfs_update_parent(struct clk *clk);
#else
static inline void jz4740_clock_debugfs_init(void) {};
static inline void jz4740_clock_debugfs_add_clk(struct clk *clk) {};
static inline void jz4740_clock_debugfs_update_parent(struct clk *clk) {};
#endif
#endif