[PATCH] ARM: ux500: Add debugfs support for powerdebug
Vincent Guittot
vincent.guittot at linaro.org
Tue Dec 7 05:20:41 EST 2010
This patch adds clock information to debugfs interface. This clock
tree like directory is used by powerdebug for displaying a readable
clock status. This patch sets also the name of clk_32khz and
clk_dummy_apb_pclk because this field is used to generate the clock
tree.
Signed-off-by: Vincent Guittot <vincent.guittot at stericsson.com>
---
arch/arm/mach-ux500/clock.c | 195 ++++++++++++++++++++++++++++++++++++++++++-
arch/arm/mach-ux500/clock.h | 4 +
2 files changed, 198 insertions(+), 1 deletions(-)
diff --git a/arch/arm/mach-ux500/clock.c b/arch/arm/mach-ux500/clock.c
index 598902d..343a5a5 100644
--- a/arch/arm/mach-ux500/clock.c
+++ b/arch/arm/mach-ux500/clock.c
@@ -20,6 +20,12 @@
#include <mach/hardware.h>
#include "clock.h"
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+#include <linux/uaccess.h> /* for copy_from_user */
+static LIST_HEAD(clk_list);
+#endif
+
#define PRCC_PCKEN 0x00
#define PRCC_PCKDIS 0x04
#define PRCC_KCKEN 0x08
@@ -286,6 +292,7 @@ static struct clkops clk_prcc_ops = {
};
static struct clk clk_32khz = {
+ .name = "clk_32khz",
.rate = 32000,
};
@@ -422,7 +429,9 @@ static DEFINE_PRCC_CLK_CUSTOM(7, mtu0_ed, 2, -1,
NULL, clk_mtu_get_rate, 0);
static DEFINE_PRCC_CLK(7, wdg_ed, 1, -1, NULL);
static DEFINE_PRCC_CLK(7, cfgreg_ed, 0, -1, NULL);
-static struct clk clk_dummy_apb_pclk;
+static struct clk clk_dummy_apb_pclk = {
+ .name = "apb_pclk",
+};
static struct clk_lookup u8500_common_clks[] = {
CLK(dummy_apb_pclk, NULL, "apb_pclk"),
@@ -568,6 +577,183 @@ static struct clk_lookup u8500_v1_clks[] = {
CLK(uiccclk, "uicc", NULL),
};
+#ifdef CONFIG_DEBUG_FS
+/*
+ * debugfs support to trace clock tree hierarchy and attributes with
+ * powerdebug
+ */
+static struct dentry *clk_debugfs_root;
+
+void __init clk_debugfs_add_table(struct clk_lookup *cl, size_t num)
+{
+ while (num--) {
+ /* Check that the clock has not been already registered */
+ if (!(cl->clk->list.prev != cl->clk->list.next))
+ list_add_tail(&cl->clk->list, &clk_list);
+
+ cl++;
+ }
+}
+
+static ssize_t usecount_dbg_read(struct file *file, char __user *buf,
+ size_t size, loff_t *off)
+{
+ struct clk *clk = file->f_dentry->d_inode->i_private;
+ char cusecount[128];
+ unsigned int len;
+
+ len = sprintf(cusecount, "%u\n", clk->enabled);
+ return simple_read_from_buffer(buf, size, off, cusecount, len);
+}
+
+static ssize_t rate_dbg_read(struct file *file, char __user *buf,
+ size_t size, loff_t *off)
+{
+ struct clk *clk = file->f_dentry->d_inode->i_private;
+ char crate[128];
+ unsigned int rate;
+ unsigned int len;
+
+ rate = clk_get_rate(clk);
+ len = sprintf(crate, "%u\n", rate);
+ return simple_read_from_buffer(buf, size, off, crate, len);
+}
+
+static const struct file_operations usecount_fops = {
+ .read = usecount_dbg_read,
+};
+
+static const struct file_operations set_rate_fops = {
+ .read = rate_dbg_read,
+};
+
+static struct dentry *clk_debugfs_register_dir(struct clk *c,
+ struct dentry *p_dentry)
+{
+ struct dentry *d, *clk_d, *child, *child_tmp;
+ char s[255];
+ char *p = s;
+
+ if (c->name == NULL)
+ p += sprintf(p, "BUG");
+ else
+ p += sprintf(p, "%s", c->name);
+
+ clk_d = debugfs_create_dir(s, p_dentry);
+ if (!clk_d)
+ return NULL;
+
+ d = debugfs_create_file("usecount", S_IRUGO,
+ clk_d, c, &usecount_fops);
+ if (!d)
+ goto err_out;
+ d = debugfs_create_file("rate", S_IRUGO,
+ clk_d, c, &set_rate_fops);
+ if (!d)
+ goto err_out;
+ /*
+ * TODO : not currently available in ux500
+ * d = debugfs_create_x32("flags", S_IRUGO, clk_d, (u32 *)&c->flags);
+ * if (!d)
+ * goto err_out;
+ */
+
+ return clk_d;
+
+err_out:
+ d = clk_d;
+ list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child)
+ debugfs_remove(child);
+ debugfs_remove(clk_d);
+ return NULL;
+}
+
+static void clk_debugfs_remove_dir(struct dentry *cdentry)
+{
+ struct dentry *d, *child, *child_tmp;
+
+ d = cdentry;
+ list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child)
+ debugfs_remove(child);
+ debugfs_remove(cdentry);
+ return ;
+}
+
+static int clk_debugfs_register_one(struct clk *c)
+{
+ struct clk *pa = c->parent_periph;
+ struct clk *bpa = c->parent_cluster;
+
+ if (!(bpa && !pa)) {
+ c->dent = clk_debugfs_register_dir(c,
+ pa ? pa->dent : clk_debugfs_root);
+ if (!c->dent)
+ return -ENOMEM;
+ }
+
+ if (bpa) {
+ c->dent_bus = clk_debugfs_register_dir(c,
+ bpa->dent_bus ? bpa->dent_bus : bpa->dent);
+ if ((!c->dent_bus) && (c->dent)) {
+ clk_debugfs_remove_dir(c->dent);
+ c->dent = NULL;
+ return -ENOMEM;
+ }
+ }
+ return 0;
+}
+
+static int clk_debugfs_register(struct clk *c)
+{
+ int err;
+ struct clk *pa = c->parent_periph;
+ struct clk *bpa = c->parent_cluster;
+
+ if (pa && (!pa->dent && !pa->dent_bus)) {
+ err = clk_debugfs_register(pa);
+ if (err)
+ return err;
+ }
+
+ if (bpa && (!bpa->dent && !bpa->dent_bus)) {
+ err = clk_debugfs_register(bpa);
+ if (err)
+ return err;
+ }
+
+ if ((!c->dent) && (!c->dent_bus)) {
+ err = clk_debugfs_register_one(c);
+ if (err)
+ return err;
+ }
+ return 0;
+}
+
+static int __init clk_debugfs_init(void)
+{
+ struct clk *c;
+ struct dentry *d;
+ int err;
+
+ d = debugfs_create_dir("clock", NULL);
+ if (!d)
+ return -ENOMEM;
+ clk_debugfs_root = d;
+
+ list_for_each_entry(c, &clk_list, list) {
+ err = clk_debugfs_register(c);
+ if (err)
+ goto err_out;
+ }
+ return 0;
+err_out:
+ debugfs_remove_recursive(clk_debugfs_root);
+ return err;
+}
+
+late_initcall(clk_debugfs_init);
+#endif /* defined(CONFIG_DEBUG_FS) */
+
int __init clk_init(void)
{
if (cpu_is_u8500ed()) {
@@ -589,5 +775,12 @@ int __init clk_init(void)
else
clkdev_add_table(u8500_v1_clks, ARRAY_SIZE(u8500_v1_clks));
+#ifdef CONFIG_DEBUG_FS
+ clk_debugfs_add_table(u8500_common_clks, ARRAY_SIZE(u8500_common_clks));
+ if (cpu_is_u8500ed())
+ clk_debugfs_add_table(u8500_ed_clks, ARRAY_SIZE(u8500_ed_clks));
+ else
+ clk_debugfs_add_table(u8500_v1_clks, ARRAY_SIZE(u8500_v1_clks));
+#endif
return 0;
}
diff --git a/arch/arm/mach-ux500/clock.h b/arch/arm/mach-ux500/clock.h
index a058025..0744907 100644
--- a/arch/arm/mach-ux500/clock.h
+++ b/arch/arm/mach-ux500/clock.h
@@ -90,6 +90,10 @@ struct clk {
struct clk *parent_cluster;
struct clk *parent_periph;
+#if defined(CONFIG_DEBUG_FS)
+ struct dentry *dent; /* For visible tree hierarchy */
+ struct dentry *dent_bus; /* For visible tree hierarchy */
+#endif
};
#define DEFINE_PRCMU_CLK(_name, _cg_off, _cg_bit, _reg) \
--
1.7.0.4
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