blob: c3b722936875f2eb54263016a42882c210c06ed7 [file] [log] [blame]
/*
* Copyright (C) 2007 Google, Inc.
* Copyright (c) 2007-2013, The Linux Foundation. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/clk.h>
#include <linux/list.h>
#include <linux/clkdev.h>
#include <linux/uaccess.h>
#include <linux/mutex.h>
#include <linux/io.h>
#include <mach/clk-provider.h>
#include "clock.h"
static LIST_HEAD(clk_list);
static DEFINE_SPINLOCK(clk_list_lock);
static struct dentry *debugfs_base;
static u32 debug_suspend;
struct clk_table {
struct list_head node;
struct clk_lookup *clocks;
size_t num_clocks;
};
static int clock_debug_rate_set(void *data, u64 val)
{
struct clk *clock = data;
int ret;
/* Only increases to max rate will succeed, but that's actually good
* for debugging purposes so we don't check for error. */
if (clock->flags & CLKFLAG_MAX)
clk_set_max_rate(clock, val);
ret = clk_set_rate(clock, val);
if (ret)
pr_err("clk_set_rate(%s, %lu) failed (%d)\n", clock->dbg_name,
(unsigned long)val, ret);
return ret;
}
static int clock_debug_rate_get(void *data, u64 *val)
{
struct clk *clock = data;
*val = clk_get_rate(clock);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(clock_rate_fops, clock_debug_rate_get,
clock_debug_rate_set, "%llu\n");
static struct clk *measure;
static int clock_debug_measure_get(void *data, u64 *val)
{
struct clk *clock = data;
int ret, is_hw_gated;
/* Check to see if the clock is in hardware gating mode */
if (clock->ops->in_hwcg_mode)
is_hw_gated = clock->ops->in_hwcg_mode(clock);
else
is_hw_gated = 0;
ret = clk_set_parent(measure, clock);
if (!ret) {
/*
* Disable hw gating to get accurate rate measurements. Only do
* this if the clock is explictly enabled by software. This
* allows us to detect errors where clocks are on even though
* software is not requesting them to be on due to broken
* hardware gating signals.
*/
if (is_hw_gated && clock->count)
clock->ops->disable_hwcg(clock);
*val = clk_get_rate(measure);
/* Reenable hwgating if it was disabled */
if (is_hw_gated && clock->count)
clock->ops->enable_hwcg(clock);
}
return ret;
}
DEFINE_SIMPLE_ATTRIBUTE(clock_measure_fops, clock_debug_measure_get,
NULL, "%lld\n");
static int clock_debug_enable_set(void *data, u64 val)
{
struct clk *clock = data;
int rc = 0;
if (val)
rc = clk_prepare_enable(clock);
else
clk_disable_unprepare(clock);
return rc;
}
static int clock_debug_enable_get(void *data, u64 *val)
{
struct clk *clock = data;
int enabled;
if (clock->ops->is_enabled)
enabled = clock->ops->is_enabled(clock);
else
enabled = !!(clock->count);
*val = enabled;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(clock_enable_fops, clock_debug_enable_get,
clock_debug_enable_set, "%lld\n");
static int clock_debug_local_get(void *data, u64 *val)
{
struct clk *clock = data;
if (!clock->ops->is_local)
*val = true;
else
*val = clock->ops->is_local(clock);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(clock_local_fops, clock_debug_local_get,
NULL, "%llu\n");
static int clock_debug_hwcg_get(void *data, u64 *val)
{
struct clk *clock = data;
if (clock->ops->in_hwcg_mode)
*val = !!clock->ops->in_hwcg_mode(clock);
else
*val = 0;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(clock_hwcg_fops, clock_debug_hwcg_get,
NULL, "%llu\n");
static void clock_print_fmax_by_level(struct seq_file *m, int level)
{
struct clk *clock = m->private;
struct clk_vdd_class *vdd_class = clock->vdd_class;
int off, i, vdd_level, nregs = vdd_class->num_regulators;
vdd_level = find_vdd_level(clock, clock->rate);
seq_printf(m, "%2s%10lu", vdd_level == level ? "[" : "",
clock->fmax[level]);
for (i = 0; i < nregs; i++) {
off = nregs*level + i;
if (vdd_class->vdd_uv)
seq_printf(m, "%10u", vdd_class->vdd_uv[off]);
if (vdd_class->vdd_ua)
seq_printf(m, "%10u", vdd_class->vdd_ua[off]);
}
if (vdd_level == level)
seq_puts(m, "]");
seq_puts(m, "\n");
}
static int fmax_rates_show(struct seq_file *m, void *unused)
{
struct clk *clock = m->private;
struct clk_vdd_class *vdd_class = clock->vdd_class;
int level = 0, i, nregs = vdd_class->num_regulators;
char reg_name[10];
int vdd_level = find_vdd_level(clock, clock->rate);
if (vdd_level < 0) {
seq_printf(m, "could not find_vdd_level for %s, %ld\n",
clock->dbg_name, clock->rate);
return 0;
}
seq_printf(m, "%12s", "");
for (i = 0; i < nregs; i++) {
snprintf(reg_name, ARRAY_SIZE(reg_name), "reg %d", i);
seq_printf(m, "%10s", reg_name);
if (vdd_class->vdd_ua)
seq_printf(m, "%10s", "");
}
seq_printf(m, "\n%12s", "freq");
for (i = 0; i < nregs; i++) {
seq_printf(m, "%10s", "uV");
if (vdd_class->vdd_ua)
seq_printf(m, "%10s", "uA");
}
seq_printf(m, "\n");
for (level = 0; level < clock->num_fmax; level++)
clock_print_fmax_by_level(m, level);
return 0;
}
static int fmax_rates_open(struct inode *inode, struct file *file)
{
return single_open(file, fmax_rates_show, inode->i_private);
}
static const struct file_operations fmax_rates_fops = {
.open = fmax_rates_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
#define clock_debug_output(m, c, fmt, ...) \
do { \
if (m) \
seq_printf(m, fmt, ##__VA_ARGS__); \
else if (c) \
pr_cont(fmt, ##__VA_ARGS__); \
else \
pr_info(fmt, ##__VA_ARGS__); \
} while (0)
static int clock_debug_print_clock(struct clk *c, struct seq_file *m)
{
char *start = "";
if (!c || !c->prepare_count)
return 0;
clock_debug_output(m, 0, "\t");
do {
if (c->vdd_class)
clock_debug_output(m, 1, "%s%s:%u:%u [%ld, %lu]", start,
c->dbg_name, c->prepare_count, c->count,
c->rate, c->vdd_class->cur_level);
else
clock_debug_output(m, 1, "%s%s:%u:%u [%ld]", start,
c->dbg_name, c->prepare_count, c->count,
c->rate);
start = " -> ";
} while ((c = clk_get_parent(c)));
clock_debug_output(m, 1, "\n");
return 1;
}
/**
* clock_debug_print_enabled_clocks() - Print names of enabled clocks
*
*/
static void clock_debug_print_enabled_clocks(struct seq_file *m)
{
struct clk_table *table;
unsigned long flags;
int i, cnt = 0;
clock_debug_output(m, 0, "Enabled clocks:\n");
spin_lock_irqsave(&clk_list_lock, flags);
list_for_each_entry(table, &clk_list, node) {
for (i = 0; i < table->num_clocks; i++)
cnt += clock_debug_print_clock(table->clocks[i].clk, m);
}
spin_unlock_irqrestore(&clk_list_lock, flags);
if (cnt)
clock_debug_output(m, 0, "Enabled clock count: %d\n", cnt);
else
clock_debug_output(m, 0, "No clocks enabled.\n");
}
static int enabled_clocks_show(struct seq_file *m, void *unused)
{
clock_debug_print_enabled_clocks(m);
return 0;
}
static int enabled_clocks_open(struct inode *inode, struct file *file)
{
return single_open(file, enabled_clocks_show, inode->i_private);
}
static const struct file_operations enabled_clocks_fops = {
.open = enabled_clocks_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int list_rates_show(struct seq_file *m, void *unused)
{
struct clk *clock = m->private;
int level, i = 0;
unsigned long rate, fmax = 0;
/* Find max frequency supported within voltage constraints. */
if (!clock->vdd_class) {
fmax = ULONG_MAX;
} else {
for (level = 0; level < clock->num_fmax; level++)
if (clock->fmax[level])
fmax = clock->fmax[level];
}
/*
* List supported frequencies <= fmax. Higher frequencies may appear in
* the frequency table, but are not valid and should not be listed.
*/
while (!IS_ERR_VALUE(rate = clock->ops->list_rate(clock, i++))) {
if (rate <= fmax)
seq_printf(m, "%lu\n", rate);
}
return 0;
}
static int list_rates_open(struct inode *inode, struct file *file)
{
return single_open(file, list_rates_show, inode->i_private);
}
static const struct file_operations list_rates_fops = {
.open = list_rates_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static ssize_t clock_parent_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
struct clk *clock = filp->private_data;
struct clk *p = clock->parent;
char name[256] = {0};
snprintf(name, sizeof(name), "%s\n", p ? p->dbg_name : "None\n");
return simple_read_from_buffer(ubuf, cnt, ppos, name, strlen(name));
}
static ssize_t clock_parent_write(struct file *filp,
const char __user *ubuf, size_t cnt, loff_t *ppos)
{
struct clk *clock = filp->private_data;
char buf[256];
char *cmp;
unsigned long flags;
struct clk_table *table;
int i, ret;
struct clk *parent = NULL;
cnt = min(cnt, sizeof(buf) - 1);
if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
buf[cnt] = '\0';
cmp = strstrip(buf);
spin_lock_irqsave(&clk_list_lock, flags);
list_for_each_entry(table, &clk_list, node) {
for (i = 0; i < table->num_clocks; i++)
if (!strcmp(cmp, table->clocks[i].clk->dbg_name)) {
parent = table->clocks[i].clk;
break;
}
if (parent)
break;
}
if (!parent) {
ret = -EINVAL;
goto err;
}
spin_unlock_irqrestore(&clk_list_lock, flags);
ret = clk_set_parent(clock, table->clocks[i].clk);
if (ret)
return ret;
return cnt;
err:
spin_unlock_irqrestore(&clk_list_lock, flags);
return ret;
}
static const struct file_operations clock_parent_fops = {
.open = simple_open,
.read = clock_parent_read,
.write = clock_parent_write,
};
void clk_debug_print_hw(struct clk *clk, struct seq_file *f)
{
void __iomem *base;
struct clk_register_data *regs;
u32 i, j, size;
if (IS_ERR_OR_NULL(clk))
return;
clk_debug_print_hw(clk->parent, f);
clock_debug_output(f, false, "%s\n", clk->dbg_name);
if (!clk->ops->list_registers)
return;
j = 0;
base = clk->ops->list_registers(clk, j, &regs, &size);
while (!IS_ERR(base)) {
for (i = 0; i < size; i++) {
u32 val = readl_relaxed(base + regs[i].offset);
clock_debug_output(f, false, "%20s: 0x%.8x\n",
regs[i].name, val);
}
j++;
base = clk->ops->list_registers(clk, j, &regs, &size);
}
}
static int print_hw_show(struct seq_file *m, void *unused)
{
struct clk *c = m->private;
clk_debug_print_hw(c, m);
return 0;
}
static int print_hw_open(struct inode *inode, struct file *file)
{
return single_open(file, print_hw_show, inode->i_private);
}
static const struct file_operations clock_print_hw_fops = {
.open = print_hw_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int clock_debug_add(struct clk *clock)
{
char temp[50], *ptr;
struct dentry *clk_dir;
if (!debugfs_base)
return -ENOMEM;
strlcpy(temp, clock->dbg_name, ARRAY_SIZE(temp));
for (ptr = temp; *ptr; ptr++)
*ptr = tolower(*ptr);
clk_dir = debugfs_create_dir(temp, debugfs_base);
if (!clk_dir)
return -ENOMEM;
if (!debugfs_create_file("rate", S_IRUGO | S_IWUSR, clk_dir,
clock, &clock_rate_fops))
goto error;
if (!debugfs_create_file("enable", S_IRUGO | S_IWUSR, clk_dir,
clock, &clock_enable_fops))
goto error;
if (!debugfs_create_file("is_local", S_IRUGO, clk_dir, clock,
&clock_local_fops))
goto error;
if (!debugfs_create_file("has_hw_gating", S_IRUGO, clk_dir, clock,
&clock_hwcg_fops))
goto error;
if (measure &&
!clk_set_parent(measure, clock) &&
!debugfs_create_file("measure", S_IRUGO, clk_dir, clock,
&clock_measure_fops))
goto error;
if (clock->ops->list_rate)
if (!debugfs_create_file("list_rates",
S_IRUGO, clk_dir, clock, &list_rates_fops))
goto error;
if (clock->vdd_class && !debugfs_create_file("fmax_rates",
S_IRUGO, clk_dir, clock, &fmax_rates_fops))
goto error;
if (!debugfs_create_file("parent", S_IRUGO, clk_dir, clock,
&clock_parent_fops))
goto error;
if (!debugfs_create_file("print", S_IRUGO, clk_dir, clock,
&clock_print_hw_fops))
goto error;
return 0;
error:
debugfs_remove_recursive(clk_dir);
return -ENOMEM;
}
static DEFINE_MUTEX(clk_debug_lock);
static int clk_debug_init_once;
/**
* clock_debug_init() - Initialize clock debugfs
* Lock clk_debug_lock before invoking this function.
*/
static int clock_debug_init(void)
{
if (clk_debug_init_once)
return 0;
clk_debug_init_once = 1;
debugfs_base = debugfs_create_dir("clk", NULL);
if (!debugfs_base)
return -ENOMEM;
if (!debugfs_create_u32("debug_suspend", S_IRUGO | S_IWUSR,
debugfs_base, &debug_suspend)) {
debugfs_remove_recursive(debugfs_base);
return -ENOMEM;
}
if (!debugfs_create_file("enabled_clocks", S_IRUGO, debugfs_base, NULL,
&enabled_clocks_fops))
return -ENOMEM;
measure = clk_get_sys("debug", "measure");
if (IS_ERR(measure))
measure = NULL;
return 0;
}
/**
* clock_debug_register() - Add additional clocks to clock debugfs hierarchy
* @table: Table of clocks to create debugfs nodes for
* @size: Size of @table
*
*/
int clock_debug_register(struct clk_lookup *table, size_t size)
{
struct clk_table *clk_table;
unsigned long flags;
int i, ret;
mutex_lock(&clk_debug_lock);
ret = clock_debug_init();
if (ret)
goto out;
clk_table = kmalloc(sizeof(*clk_table), GFP_KERNEL);
if (!clk_table) {
ret = -ENOMEM;
goto out;
}
clk_table->clocks = table;
clk_table->num_clocks = size;
spin_lock_irqsave(&clk_list_lock, flags);
list_add_tail(&clk_table->node, &clk_list);
spin_unlock_irqrestore(&clk_list_lock, flags);
for (i = 0; i < size; i++)
clock_debug_add(table[i].clk);
out:
mutex_unlock(&clk_debug_lock);
return ret;
}
/*
* Print the names of enabled clocks and their parents if debug_suspend is set
*/
void clock_debug_print_enabled(void)
{
if (likely(!debug_suspend))
return;
clock_debug_print_enabled_clocks(NULL);
}