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OMAP: PM debug: Add PRCM register dump support
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Allows dumping out current register contents from the debug filesystem, and
also allows user to add arbitrary register save points into code. Current
register contents are available under debugfs at:

[debugfs]/pm_debug/registers/current

To add a save point, do following:

From module init (or somewhere before the save call, called only once):
  pm_dbg_init_regset(n); // n=1..4, allocates memory for dump area #n

From arbitrary code location:
  pm_dbg_regset_save(n); // n=1..4, saves registers to dump area #n

After this, the register dump can be seen under [debugfs]/pm_debug/registers/n

Signed-off-by: Tero Kristo <tero.kristo@nokia.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
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Tero Kristo authored and Kevin Hilman committed Sep 2, 2009
1 parent 6199ab2 commit 2811d6b
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Showing 2 changed files with 229 additions and 1 deletion.
226 changes: 225 additions & 1 deletion arch/arm/mach-omap2/pm-debug.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,8 @@ int omap2_pm_debug;
regs[reg_count].name = #reg; \
regs[reg_count++].val = __raw_readl(OMAP2_IO_ADDRESS(0x480fe000 + (off)))

static int __init pm_dbg_init(void);

void omap2_pm_dump(int mode, int resume, unsigned int us)
{
struct reg {
Expand Down Expand Up @@ -157,6 +159,8 @@ void omap2_pm_dump(int mode, int resume, unsigned int us)
#include <linux/debugfs.h>
#include <linux/seq_file.h>

static void pm_dbg_regset_store(u32 *ptr);

struct dentry *pm_dbg_dir;

static int pm_dbg_init_done;
Expand All @@ -166,6 +170,160 @@ enum {
DEBUG_FILE_TIMERS,
};

struct pm_module_def {
char name[8]; /* Name of the module */
short type; /* CM or PRM */
unsigned short offset;
int low; /* First register address on this module */
int high; /* Last register address on this module */
};

#define MOD_CM 0
#define MOD_PRM 1

static const struct pm_module_def *pm_dbg_reg_modules;
static const struct pm_module_def omap3_pm_reg_modules[] = {
{ "IVA2", MOD_CM, OMAP3430_IVA2_MOD, 0, 0x4c },
{ "OCP", MOD_CM, OCP_MOD, 0, 0x10 },
{ "MPU", MOD_CM, MPU_MOD, 4, 0x4c },
{ "CORE", MOD_CM, CORE_MOD, 0, 0x4c },
{ "SGX", MOD_CM, OMAP3430ES2_SGX_MOD, 0, 0x4c },
{ "WKUP", MOD_CM, WKUP_MOD, 0, 0x40 },
{ "CCR", MOD_CM, PLL_MOD, 0, 0x70 },
{ "DSS", MOD_CM, OMAP3430_DSS_MOD, 0, 0x4c },
{ "CAM", MOD_CM, OMAP3430_CAM_MOD, 0, 0x4c },
{ "PER", MOD_CM, OMAP3430_PER_MOD, 0, 0x4c },
{ "EMU", MOD_CM, OMAP3430_EMU_MOD, 0x40, 0x54 },
{ "NEON", MOD_CM, OMAP3430_NEON_MOD, 0x20, 0x48 },
{ "USB", MOD_CM, OMAP3430ES2_USBHOST_MOD, 0, 0x4c },

{ "IVA2", MOD_PRM, OMAP3430_IVA2_MOD, 0x50, 0xfc },
{ "OCP", MOD_PRM, OCP_MOD, 4, 0x1c },
{ "MPU", MOD_PRM, MPU_MOD, 0x58, 0xe8 },
{ "CORE", MOD_PRM, CORE_MOD, 0x58, 0xf8 },
{ "SGX", MOD_PRM, OMAP3430ES2_SGX_MOD, 0x58, 0xe8 },
{ "WKUP", MOD_PRM, WKUP_MOD, 0xa0, 0xb0 },
{ "CCR", MOD_PRM, PLL_MOD, 0x40, 0x70 },
{ "DSS", MOD_PRM, OMAP3430_DSS_MOD, 0x58, 0xe8 },
{ "CAM", MOD_PRM, OMAP3430_CAM_MOD, 0x58, 0xe8 },
{ "PER", MOD_PRM, OMAP3430_PER_MOD, 0x58, 0xe8 },
{ "EMU", MOD_PRM, OMAP3430_EMU_MOD, 0x58, 0xe4 },
{ "GLBL", MOD_PRM, OMAP3430_GR_MOD, 0x20, 0xe4 },
{ "NEON", MOD_PRM, OMAP3430_NEON_MOD, 0x58, 0xe8 },
{ "USB", MOD_PRM, OMAP3430ES2_USBHOST_MOD, 0x58, 0xe8 },
{ "", 0, 0, 0, 0 },
};

#define PM_DBG_MAX_REG_SETS 4

static void *pm_dbg_reg_set[PM_DBG_MAX_REG_SETS];

static int pm_dbg_get_regset_size(void)
{
static int regset_size;

if (regset_size == 0) {
int i = 0;

while (pm_dbg_reg_modules[i].name[0] != 0) {
regset_size += pm_dbg_reg_modules[i].high +
4 - pm_dbg_reg_modules[i].low;
i++;
}
}
return regset_size;
}

static int pm_dbg_show_regs(struct seq_file *s, void *unused)
{
int i, j;
unsigned long val;
int reg_set = (int)s->private;
u32 *ptr;
void *store = NULL;
int regs;
int linefeed;

if (reg_set == 0) {
store = kmalloc(pm_dbg_get_regset_size(), GFP_KERNEL);
ptr = store;
pm_dbg_regset_store(ptr);
} else {
ptr = pm_dbg_reg_set[reg_set - 1];
}

i = 0;

while (pm_dbg_reg_modules[i].name[0] != 0) {
regs = 0;
linefeed = 0;
if (pm_dbg_reg_modules[i].type == MOD_CM)
seq_printf(s, "MOD: CM_%s (%08x)\n",
pm_dbg_reg_modules[i].name,
(u32)(OMAP3430_CM_BASE +
pm_dbg_reg_modules[i].offset));
else
seq_printf(s, "MOD: PRM_%s (%08x)\n",
pm_dbg_reg_modules[i].name,
(u32)(OMAP3430_PRM_BASE +
pm_dbg_reg_modules[i].offset));

for (j = pm_dbg_reg_modules[i].low;
j <= pm_dbg_reg_modules[i].high; j += 4) {
val = *(ptr++);
if (val != 0) {
regs++;
if (linefeed) {
seq_printf(s, "\n");
linefeed = 0;
}
seq_printf(s, " %02x => %08lx", j, val);
if (regs % 4 == 0)
linefeed = 1;
}
}
seq_printf(s, "\n");
i++;
}

if (store != NULL)
kfree(store);

return 0;
}

static void pm_dbg_regset_store(u32 *ptr)
{
int i, j;
u32 val;

i = 0;

while (pm_dbg_reg_modules[i].name[0] != 0) {
for (j = pm_dbg_reg_modules[i].low;
j <= pm_dbg_reg_modules[i].high; j += 4) {
if (pm_dbg_reg_modules[i].type == MOD_CM)
val = cm_read_mod_reg(
pm_dbg_reg_modules[i].offset, j);
else
val = prm_read_mod_reg(
pm_dbg_reg_modules[i].offset, j);
*(ptr++) = val;
}
i++;
}
}

int pm_dbg_regset_save(int reg_set)
{
if (pm_dbg_reg_set[reg_set-1] == NULL)
return -EINVAL;

pm_dbg_regset_store(pm_dbg_reg_set[reg_set-1]);

return 0;
}

static const char pwrdm_state_names[][4] = {
"OFF",
"RET",
Expand Down Expand Up @@ -280,13 +438,52 @@ static int pm_dbg_open(struct inode *inode, struct file *file)
};
}

static int pm_dbg_reg_open(struct inode *inode, struct file *file)
{
return single_open(file, pm_dbg_show_regs, inode->i_private);
}

static const struct file_operations debug_fops = {
.open = pm_dbg_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};

static const struct file_operations debug_reg_fops = {
.open = pm_dbg_reg_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};

int pm_dbg_regset_init(int reg_set)
{
char name[2];

if (!pm_dbg_init_done)
pm_dbg_init();

if (reg_set < 1 || reg_set > PM_DBG_MAX_REG_SETS ||
pm_dbg_reg_set[reg_set-1] != NULL)
return -EINVAL;

pm_dbg_reg_set[reg_set-1] =
kmalloc(pm_dbg_get_regset_size(), GFP_KERNEL);

if (pm_dbg_reg_set[reg_set-1] == NULL)
return -ENOMEM;

if (pm_dbg_dir != NULL) {
sprintf(name, "%d", reg_set);

(void) debugfs_create_file(name, S_IRUGO,
pm_dbg_dir, (void *)reg_set, &debug_reg_fops);
}

return 0;
}

static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
{
int i;
Expand All @@ -304,8 +501,20 @@ static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)

static int __init pm_dbg_init(void)
{
int i;
struct dentry *d;
char name[2];

if (pm_dbg_init_done)
return 0;

if (cpu_is_omap34xx())
pm_dbg_reg_modules = omap3_pm_reg_modules;
else {
printk(KERN_ERR "%s: only OMAP3 supported\n", __func__);
return -ENODEV;
}

d = debugfs_create_dir("pm_debug", NULL);
if (IS_ERR(d))
return PTR_ERR(d);
Expand All @@ -317,11 +526,26 @@ static int __init pm_dbg_init(void)

pwrdm_for_each(pwrdms_setup, NULL);

pm_dbg_dir = debugfs_create_dir("registers", d);
if (IS_ERR(pm_dbg_dir))
return PTR_ERR(pm_dbg_dir);

(void) debugfs_create_file("current", S_IRUGO,
pm_dbg_dir, (void *)0, &debug_reg_fops);

for (i = 0; i < PM_DBG_MAX_REG_SETS; i++)
if (pm_dbg_reg_set[i] != NULL) {
sprintf(name, "%d", i+1);
(void) debugfs_create_file(name, S_IRUGO,
pm_dbg_dir, (void *)(i+1), &debug_reg_fops);

}

pm_dbg_init_done = 1;

return 0;
}
late_initcall(pm_dbg_init);
arch_initcall(pm_dbg_init);

#else
void pm_dbg_update_time(struct powerdomain *pwrdm, int prev) {}
Expand Down
4 changes: 4 additions & 0 deletions arch/arm/mach-omap2/pm.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -17,10 +17,14 @@
extern void omap2_pm_dump(int mode, int resume, unsigned int us);
extern int omap2_pm_debug;
extern void pm_dbg_update_time(struct powerdomain *pwrdm, int prev);
extern int pm_dbg_regset_save(int reg_set);
extern int pm_dbg_regset_init(int reg_set);
#else
#define omap2_pm_dump(mode, resume, us) do {} while (0);
#define omap2_pm_debug 0
#define pm_dbg_update_time(pwrdm, prev) do {} while (0);
#define pm_dbg_regset_save(reg_set) do {} while (0);
#define pm_dbg_regset_init(reg_set) do {} while (0);
#endif /* CONFIG_PM_DEBUG */

extern void omap24xx_idle_loop_suspend(void);
Expand Down

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