From: Tero Kristo <tero.kristo@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-omap2/pm-debug.c | 208 ++++++++++++++++++++++++++++++++++++++++
arch/arm/mach-omap2/pm.h | 4 +
2 files changed, 212 insertions(+), 0 deletions(-)
mode change 100644 => 100755 arch/arm/mach-omap2/pm-debug.c
mode change 100644 => 100755 arch/arm/mach-omap2/pm.h
diff --git a/arch/arm/mach-omap2/pm-debug.c b/arch/arm/mach-omap2/pm-debug.c
old mode 100644
new mode 100755
index 9199c17..37b883b
--- a/arch/arm/mach-omap2/pm-debug.c
+++ b/arch/arm/mach-omap2/pm-debug.c
@@ -157,6 +157,8 @@ 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;
@@ -166,6 +168,159 @@ 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[] = {
+ { "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",
@@ -280,6 +435,11 @@ 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,
@@ -287,6 +447,37 @@ static const struct file_operations debug_fops = {
.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 (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;
@@ -304,7 +495,9 @@ 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];
d = debugfs_create_dir("pm_debug", NULL);
if (IS_ERR(d))
@@ -317,6 +510,21 @@ 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;
diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
old mode 100644
new mode 100755
index 4589db1..8fa8567
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -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);
--
1.6.4
--
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