ux500: add debugfs support for powerdebug
Signed-off-by: Vincent Guittot <vincent.guittot@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
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@ -20,6 +20,12 @@
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#include <mach/hardware.h>
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#include "clock.h"
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#ifdef CONFIG_DEBUG_FS
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#include <linux/debugfs.h>
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#include <linux/uaccess.h> /* for copy_from_user */
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static LIST_HEAD(clk_list);
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#endif
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#define PRCC_PCKEN 0x00
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#define PRCC_PCKDIS 0x04
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#define PRCC_KCKEN 0x08
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@ -286,6 +292,7 @@ static struct clkops clk_prcc_ops = {
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};
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static struct clk clk_32khz = {
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.name = "clk_32khz",
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.rate = 32000,
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};
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@ -422,7 +429,9 @@ static DEFINE_PRCC_CLK_CUSTOM(7, mtu0_ed, 2, -1, NULL, clk_mtu_get_rate, 0);
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static DEFINE_PRCC_CLK(7, wdg_ed, 1, -1, NULL);
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static DEFINE_PRCC_CLK(7, cfgreg_ed, 0, -1, NULL);
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static struct clk clk_dummy_apb_pclk;
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static struct clk clk_dummy_apb_pclk = {
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.name = "apb_pclk",
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};
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static struct clk_lookup u8500_common_clks[] = {
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CLK(dummy_apb_pclk, NULL, "apb_pclk"),
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@ -568,6 +577,183 @@ static struct clk_lookup u8500_v1_clks[] = {
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CLK(uiccclk, "uicc", NULL),
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};
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#ifdef CONFIG_DEBUG_FS
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/*
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* debugfs support to trace clock tree hierarchy and attributes with
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* powerdebug
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*/
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static struct dentry *clk_debugfs_root;
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void __init clk_debugfs_add_table(struct clk_lookup *cl, size_t num)
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{
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while (num--) {
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/* Check that the clock has not been already registered */
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if (!(cl->clk->list.prev != cl->clk->list.next))
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list_add_tail(&cl->clk->list, &clk_list);
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cl++;
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}
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}
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static ssize_t usecount_dbg_read(struct file *file, char __user *buf,
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size_t size, loff_t *off)
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{
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struct clk *clk = file->f_dentry->d_inode->i_private;
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char cusecount[128];
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unsigned int len;
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len = sprintf(cusecount, "%u\n", clk->enabled);
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return simple_read_from_buffer(buf, size, off, cusecount, len);
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}
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static ssize_t rate_dbg_read(struct file *file, char __user *buf,
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size_t size, loff_t *off)
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{
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struct clk *clk = file->f_dentry->d_inode->i_private;
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char crate[128];
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unsigned int rate;
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unsigned int len;
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rate = clk_get_rate(clk);
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len = sprintf(crate, "%u\n", rate);
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return simple_read_from_buffer(buf, size, off, crate, len);
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}
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static const struct file_operations usecount_fops = {
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.read = usecount_dbg_read,
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};
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static const struct file_operations set_rate_fops = {
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.read = rate_dbg_read,
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};
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static struct dentry *clk_debugfs_register_dir(struct clk *c,
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struct dentry *p_dentry)
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{
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struct dentry *d, *clk_d, *child, *child_tmp;
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char s[255];
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char *p = s;
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if (c->name == NULL)
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p += sprintf(p, "BUG");
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else
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p += sprintf(p, "%s", c->name);
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clk_d = debugfs_create_dir(s, p_dentry);
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if (!clk_d)
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return NULL;
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d = debugfs_create_file("usecount", S_IRUGO,
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clk_d, c, &usecount_fops);
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if (!d)
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goto err_out;
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d = debugfs_create_file("rate", S_IRUGO,
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clk_d, c, &set_rate_fops);
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if (!d)
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goto err_out;
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/*
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* TODO : not currently available in ux500
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* d = debugfs_create_x32("flags", S_IRUGO, clk_d, (u32 *)&c->flags);
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* if (!d)
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* goto err_out;
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*/
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return clk_d;
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err_out:
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d = clk_d;
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list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child)
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debugfs_remove(child);
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debugfs_remove(clk_d);
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return NULL;
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}
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static void clk_debugfs_remove_dir(struct dentry *cdentry)
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{
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struct dentry *d, *child, *child_tmp;
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d = cdentry;
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list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child)
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debugfs_remove(child);
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debugfs_remove(cdentry);
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return ;
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}
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static int clk_debugfs_register_one(struct clk *c)
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{
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struct clk *pa = c->parent_periph;
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struct clk *bpa = c->parent_cluster;
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if (!(bpa && !pa)) {
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c->dent = clk_debugfs_register_dir(c,
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pa ? pa->dent : clk_debugfs_root);
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if (!c->dent)
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return -ENOMEM;
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}
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if (bpa) {
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c->dent_bus = clk_debugfs_register_dir(c,
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bpa->dent_bus ? bpa->dent_bus : bpa->dent);
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if ((!c->dent_bus) && (c->dent)) {
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clk_debugfs_remove_dir(c->dent);
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c->dent = NULL;
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return -ENOMEM;
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}
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}
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return 0;
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}
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static int clk_debugfs_register(struct clk *c)
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{
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int err;
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struct clk *pa = c->parent_periph;
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struct clk *bpa = c->parent_cluster;
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if (pa && (!pa->dent && !pa->dent_bus)) {
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err = clk_debugfs_register(pa);
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if (err)
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return err;
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}
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if (bpa && (!bpa->dent && !bpa->dent_bus)) {
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err = clk_debugfs_register(bpa);
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if (err)
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return err;
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}
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if ((!c->dent) && (!c->dent_bus)) {
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err = clk_debugfs_register_one(c);
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if (err)
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return err;
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}
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return 0;
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}
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static int __init clk_debugfs_init(void)
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{
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struct clk *c;
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struct dentry *d;
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int err;
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d = debugfs_create_dir("clock", NULL);
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if (!d)
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return -ENOMEM;
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clk_debugfs_root = d;
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list_for_each_entry(c, &clk_list, list) {
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err = clk_debugfs_register(c);
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if (err)
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goto err_out;
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}
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return 0;
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err_out:
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debugfs_remove_recursive(clk_debugfs_root);
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return err;
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}
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late_initcall(clk_debugfs_init);
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#endif /* defined(CONFIG_DEBUG_FS) */
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int __init clk_init(void)
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{
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if (cpu_is_u8500ed()) {
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@ -588,5 +774,12 @@ int __init clk_init(void)
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else
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clkdev_add_table(u8500_v1_clks, ARRAY_SIZE(u8500_v1_clks));
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#ifdef CONFIG_DEBUG_FS
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clk_debugfs_add_table(u8500_common_clks, ARRAY_SIZE(u8500_common_clks));
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if (cpu_is_u8500ed())
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clk_debugfs_add_table(u8500_ed_clks, ARRAY_SIZE(u8500_ed_clks));
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else
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clk_debugfs_add_table(u8500_v1_clks, ARRAY_SIZE(u8500_v1_clks));
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#endif
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return 0;
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}
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@ -90,6 +90,10 @@ struct clk {
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struct clk *parent_cluster;
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struct clk *parent_periph;
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#if defined(CONFIG_DEBUG_FS)
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struct dentry *dent; /* For visible tree hierarchy */
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struct dentry *dent_bus; /* For visible tree hierarchy */
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#endif
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};
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#define DEFINE_PRCMU_CLK(_name, _cg_off, _cg_bit, _reg) \
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