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authorDavid Brownell <david-b@pacbell.net>2007-08-09 20:56:07 -0700
committerHaavard Skinnemoen <hskinnemoen@atmel.com>2007-10-11 11:38:41 +0200
commitd938b89392bd3ff64e0610d8c4e0d3f7091d98db (patch)
treeba1b94b3387e031506fbac50f398afc1cff949fb /arch/avr32
parent2417a130bd4013f804983c62cb116bc9ec7f8e2d (diff)
[AVR32] /sys/kernel/debug/at32ap_clk
When debugfs is available, /sys/kernel/debug/at32ap_clk will provide a dump of the power manager registers and of the current clock tree. This can help sorting out various surprises, and when making runtime PM work. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Diffstat (limited to 'arch/avr32')
-rw-r--r--arch/avr32/mach-at32ap/clock.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/arch/avr32/mach-at32ap/clock.c b/arch/avr32/mach-at32ap/clock.c
index 0f8c89c9f832..4642117cc9ab 100644
--- a/arch/avr32/mach-at32ap/clock.c
+++ b/arch/avr32/mach-at32ap/clock.c
@@ -150,3 +150,119 @@ struct clk *clk_get_parent(struct clk *clk)
return clk->parent;
}
EXPORT_SYMBOL(clk_get_parent);
+
+
+
+#ifdef CONFIG_DEBUG_FS
+
+/* /sys/kernel/debug/at32ap_clk */
+
+#include <linux/io.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include "pm.h"
+
+
+#define NEST_DELTA 2
+#define NEST_MAX 6
+
+struct clkinf {
+ struct seq_file *s;
+ unsigned nest;
+};
+
+static void
+dump_clock(struct clk *parent, struct clkinf *r)
+{
+ unsigned nest = r->nest;
+ char buf[16 + NEST_MAX];
+ struct clk *clk;
+ unsigned i;
+
+ /* skip clocks coupled to devices that aren't registered */
+ if (parent->dev && !parent->dev->bus_id[0] && !parent->users)
+ return;
+
+ /* <nest spaces> name <pad to end> */
+ memset(buf, ' ', sizeof(buf) - 1);
+ buf[sizeof(buf) - 1] = 0;
+ i = strlen(parent->name);
+ memcpy(buf + nest, parent->name,
+ min(i, (unsigned)(sizeof(buf) - 1 - nest)));
+
+ seq_printf(r->s, "%s%c users=%2d %-3s %9ld Hz",
+ buf, parent->set_parent ? '*' : ' ',
+ parent->users,
+ parent->users ? "on" : "off", /* NOTE: not-paranoid!! */
+ clk_get_rate(parent));
+ if (parent->dev)
+ seq_printf(r->s, ", for %s", parent->dev->bus_id);
+ seq_printf(r->s, "\n");
+
+ /* cost of this scan is small, but not linear... */
+ r->nest = nest + NEST_DELTA;
+ for (i = 3; i < at32_nr_clocks; i++) {
+ clk = at32_clock_list[i];
+ if (clk->parent == parent)
+ dump_clock(clk, r);
+ }
+ r->nest = nest;
+}
+
+static int clk_show(struct seq_file *s, void *unused)
+{
+ struct clkinf r;
+ int i;
+
+ /* show all the power manager registers */
+ seq_printf(s, "MCCTRL = %8x\n", pm_readl(MCCTRL));
+ seq_printf(s, "CKSEL = %8x\n", pm_readl(CKSEL));
+ seq_printf(s, "CPUMASK = %8x\n", pm_readl(CPU_MASK));
+ seq_printf(s, "HSBMASK = %8x\n", pm_readl(HSB_MASK));
+ seq_printf(s, "PBAMASK = %8x\n", pm_readl(PBA_MASK));
+ seq_printf(s, "PBBMASK = %8x\n", pm_readl(PBB_MASK));
+ seq_printf(s, "PLL0 = %8x\n", pm_readl(PLL0));
+ seq_printf(s, "PLL1 = %8x\n", pm_readl(PLL1));
+ seq_printf(s, "IMR = %8x\n", pm_readl(IMR));
+ for (i = 0; i < 8; i++) {
+ if (i == 5)
+ continue;
+ seq_printf(s, "GCCTRL%d = %8x\n", i, pm_readl(GCCTRL(i)));
+ }
+
+ seq_printf(s, "\n");
+
+ /* show clock tree as derived from the three oscillators
+ * we "know" are at the head of the list
+ */
+ r.s = s;
+ r.nest = 0;
+ dump_clock(at32_clock_list[0], &r);
+ dump_clock(at32_clock_list[1], &r);
+ dump_clock(at32_clock_list[2], &r);
+
+ return 0;
+}
+
+static int clk_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, clk_show, NULL);
+}
+
+static const struct file_operations clk_operations = {
+ .open = clk_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init clk_debugfs_init(void)
+{
+ (void) debugfs_create_file("at32ap_clk", S_IFREG | S_IRUGO,
+ NULL, NULL, &clk_operations);
+
+ return 0;
+}
+postcore_initcall(clk_debugfs_init);
+
+#endif