diff options
| -rw-r--r-- | arch/avr32/mach-at32ap/clock.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/arch/avr32/mach-at32ap/clock.c b/arch/avr32/mach-at32ap/clock.c index 0f8c89c9f83..4642117cc9a 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 |