[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>

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