clk: add/modify debugfs support for clocks
Update clock debugfs to support the below functionalities. - Allow enable/disable a clock. - Allow set_rate on a clock. - Display the list of enabled_clocks along with prepare_count, enable_count and rate. - Display the register contents of all the clocks which support this clock operation. Change-Id: Ib67b3a3409c9e7d8adb710bb524f54f543abf712 Signed-off-by: Taniya Das <tdas@codeaurora.org>
This commit is contained in:
Taniya Das
parent
1e17007652
commit
770f204fbd
2 changed files with 209 additions and 4 deletions
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@ -2409,6 +2409,190 @@ static const struct file_operations clk_dump_fops = {
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.release = single_release,
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};
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static int clock_debug_rate_set(void *data, u64 val)
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{
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struct clk_core *core = data;
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int ret;
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ret = clk_set_rate(core->hw->clk, val);
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if (ret)
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pr_err("clk_set_rate(%lu) failed (%d)\n",
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(unsigned long)val, ret);
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return ret;
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}
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static int clock_debug_rate_get(void *data, u64 *val)
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{
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struct clk_core *core = data;
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*val = core->hw->core->rate;
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return 0;
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}
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DEFINE_SIMPLE_ATTRIBUTE(clock_rate_fops, clock_debug_rate_get,
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clock_debug_rate_set, "%llu\n");
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static ssize_t clock_parent_read(struct file *filp, char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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char name[256] = {0};
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struct clk_core *core = filp->private_data;
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struct clk_core *p = core->hw->core->parent;
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snprintf(name, sizeof(name), "%s\n", p ? p->name : "None\n");
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return simple_read_from_buffer(ubuf, cnt, ppos, name, strlen(name));
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}
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static const struct file_operations clock_parent_fops = {
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.open = simple_open,
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.read = clock_parent_read,
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};
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static int clock_debug_enable_set(void *data, u64 val)
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{
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struct clk_core *core = data;
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int rc = 0;
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if (val)
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rc = clk_prepare_enable(core->hw->clk);
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else
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clk_disable_unprepare(core->hw->clk);
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return rc;
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}
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static int clock_debug_enable_get(void *data, u64 *val)
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{
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struct clk_core *core = data;
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int enabled = 0;
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enabled = core->enable_count;
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*val = enabled;
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return 0;
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}
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DEFINE_SIMPLE_ATTRIBUTE(clock_enable_fops, clock_debug_enable_get,
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clock_debug_enable_set, "%lld\n");
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#define clock_debug_output(m, c, fmt, ...) \
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do { \
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if (m) \
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seq_printf(m, fmt, ##__VA_ARGS__); \
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else if (c) \
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pr_cont(fmt, ##__VA_ARGS__); \
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else \
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pr_info(fmt, ##__VA_ARGS__); \
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} while (0)
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int clock_debug_print_clock(struct clk_core *c, struct seq_file *s)
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{
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char *start = "";
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struct clk *clk;
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if (!c || !c->prepare_count)
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return 0;
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clk = c->hw->clk;
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clock_debug_output(s, 0, "\t");
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do {
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clock_debug_output(s, 1, "%s%s:%u:%u [%ld]", start,
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clk->core->name,
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clk->core->prepare_count,
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clk->core->enable_count,
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clk->core->rate);
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start = " -> ";
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} while ((clk = clk_get_parent(clk)));
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clock_debug_output(s, 1, "\n");
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return 1;
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}
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/*
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* clock_debug_print_enabled_clocks() - Print names of enabled clocks
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*/
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static void clock_debug_print_enabled_clocks(struct seq_file *s)
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{
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struct clk_core *core;
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int cnt = 0;
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clock_debug_output(s, 0, "Enabled clocks:\n");
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mutex_lock(&clk_debug_lock);
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hlist_for_each_entry(core, &clk_debug_list, debug_node)
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cnt += clock_debug_print_clock(core, s);
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mutex_unlock(&clk_debug_lock);
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if (cnt)
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clock_debug_output(s, 0, "Enabled clock count: %d\n", cnt);
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else
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clock_debug_output(s, 0, "No clocks enabled.\n");
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}
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static int enabled_clocks_show(struct seq_file *s, void *unused)
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{
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clock_debug_print_enabled_clocks(s);
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return 0;
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}
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static int enabled_clocks_open(struct inode *inode, struct file *file)
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{
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return single_open(file, enabled_clocks_show, inode->i_private);
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}
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static const struct file_operations clk_enabled_list_fops = {
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.open = enabled_clocks_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static void clk_debug_print_hw(struct clk_core *clk, struct seq_file *f)
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{
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if (IS_ERR_OR_NULL(clk))
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return;
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clk_debug_print_hw(clk->parent, f);
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clock_debug_output(f, false, "%s\n", clk->name);
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if (!clk->ops->list_registers)
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return;
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clk->ops->list_registers(f, clk->hw);
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}
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static int print_hw_show(struct seq_file *m, void *unused)
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{
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struct clk_core *c = m->private;
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clk_debug_print_hw(c, m);
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return 0;
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}
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static int print_hw_open(struct inode *inode, struct file *file)
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{
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return single_open(file, print_hw_show, inode->i_private);
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}
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static const struct file_operations clock_print_hw_fops = {
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.open = print_hw_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static int clk_debug_create_one(struct clk_core *core, struct dentry *pdentry)
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{
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struct dentry *d;
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@ -2425,8 +2609,8 @@ static int clk_debug_create_one(struct clk_core *core, struct dentry *pdentry)
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core->dentry = d;
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d = debugfs_create_u32("clk_rate", S_IRUGO, core->dentry,
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(u32 *)&core->rate);
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d = debugfs_create_file("clk_rate", S_IRUGO, core->dentry, core,
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&clock_rate_fops);
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if (!d)
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goto err_out;
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@ -2450,8 +2634,8 @@ static int clk_debug_create_one(struct clk_core *core, struct dentry *pdentry)
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if (!d)
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goto err_out;
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d = debugfs_create_u32("clk_enable_count", S_IRUGO, core->dentry,
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(u32 *)&core->enable_count);
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d = debugfs_create_file("clk_enable_count", S_IRUGO, core->dentry,
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core, &clock_enable_fops);
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if (!d)
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goto err_out;
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@ -2460,6 +2644,16 @@ static int clk_debug_create_one(struct clk_core *core, struct dentry *pdentry)
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if (!d)
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goto err_out;
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d = debugfs_create_file("clk_parent", S_IRUGO, core->dentry, core,
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&clock_parent_fops);
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if (!d)
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goto err_out;
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d = debugfs_create_file("clk_print_regs", S_IRUGO, core->dentry,
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core, &clock_print_hw_fops);
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if (!d)
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goto err_out;
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if (core->ops->debug_init) {
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ret = core->ops->debug_init(core->hw, core->dentry);
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if (ret)
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@ -2570,6 +2764,11 @@ static int __init clk_debug_init(void)
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if (!d)
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return -ENOMEM;
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d = debugfs_create_file("clk_enabled_list", S_IRUGO, rootdir,
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&clk_debug_list, &clk_enabled_list_fops);
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if (!d)
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return -ENOMEM;
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mutex_lock(&clk_debug_lock);
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hlist_for_each_entry(core, &clk_debug_list, debug_node)
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clk_debug_create_one(core, rootdir);
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@ -177,6 +177,10 @@ struct clk_rate_request {
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* @set_flags: Set custom flags which deals with hardware specifics. Returns 0
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* on success, -EEROR otherwise.
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*
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* @list_registers: Queries the hardware to get the current register contents.
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* This callback is optional and required clocks could
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* add this callback.
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*
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* The clk_enable/clk_disable and clk_prepare/clk_unprepare pairs allow
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* implementations to split any work between atomic (enable) and sleepable
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* (prepare) contexts. If enabling a clock requires code that might sleep,
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@ -217,6 +221,8 @@ struct clk_ops {
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void (*init)(struct clk_hw *hw);
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int (*debug_init)(struct clk_hw *hw, struct dentry *dentry);
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int (*set_flags)(struct clk_hw *hw, unsigned flags);
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void (*list_registers)(struct seq_file *f,
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struct clk_hw *hw);
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};
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/**
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