gcx: added gcpwr_get_speed function and cur_freq debugfs entry.

Determines the current speed of GC320 in megahertz.

Change-Id: I0aadf024193d8c1d2aac7ef79604367249939831
Signed-off-by: Alexei Shlychkov <x0177296@ti.com>

3 files changed, 54 insertions, 1 deletions

diff --git a/drivers/misc/gcx/gccore/gcdebug.c b/drivers/misc/gcx/gccore/gcdebug.c
index fdabcb2..fb0d502 100644
--- a/drivers/misc/gcx/gccore/gcdebug.c
+++ b/drivers/misc/gcx/gccore/gcdebug.c
@@ -16,6 +16,7 @@
 #include <linux/seq_file.h>
 #include <linux/module.h>
 #include <linux/uaccess.h>
+#include <linux/delay.h>
 #include <linux/gcx.h>
 #include <linux/gccore.h>
 #include "gcmain.h"
@@ -571,6 +572,32 @@ static const struct file_operations gc_debug_fops_log_reset = {
 
 /*****************************************************************************/
 
+static int gc_debug_show_cur_freq(struct seq_file *s, void *data)
+{
+	unsigned mhz = gcpwr_get_speed();
+	if (mhz)
+		seq_printf(s, "cur freq: %d mhz\n", mhz);
+	else
+		seq_printf(s, "unable to read cur freq\n");
+
+	return 0;
+}
+
+static int gc_debug_open_cur_freq(struct inode *inode, struct file *file)
+{
+	return single_open(file, gc_debug_show_cur_freq, 0);
+}
+
+static const struct file_operations gc_debug_fops_cur_freq = {
+	.open    = gc_debug_open_cur_freq,
+	.write   = NULL,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = single_release,
+};
+
+/*****************************************************************************/
+
 void gc_debug_init(void)
 {
 	struct dentry *logDir;
@@ -589,6 +616,8 @@ void gc_debug_init(void)
 			    &gc_debug_fops_gpu_last_error);
 	debugfs_create_bool("cache_status_every_irq", 0664, debug_root,
 			    &gc_cache_status_every_irq);
+	debugfs_create_file("cur_freq", 0664, debug_root, NULL,
+			    &gc_debug_fops_cur_freq);
 
 	logDir = debugfs_create_dir("log", debug_root);
 	if (!logDir)
diff --git a/drivers/misc/gcx/gccore/gcmain.c b/drivers/misc/gcx/gccore/gcmain.c
index 61a25ef..d4aca5a 100644
--- a/drivers/misc/gcx/gccore/gcmain.c
+++ b/drivers/misc/gcx/gccore/gcmain.c
@@ -421,7 +421,7 @@ void gcpwr_reset(struct gccorecontext *gccorecontext)
 				gcclockcontrol.raw);
 
 		/* Wait for reset. */
-		mdelay(1);
+		msleep(1);
 
 		/* Reset soft reset bit. */
 		gcclockcontrol.reg.reset = 0;
@@ -464,6 +464,29 @@ void gcpwr_reset(struct gccorecontext *gccorecontext)
 	GCEXIT(GCZONE_POWER);
 }
 
+unsigned int gcpwr_get_speed(void)
+{
+	struct gccorecontext *gccorecontext = &g_context;
+	static const int seccount = 2;
+	unsigned int cyclecount;
+	unsigned int speedmhz = 0;
+
+	GCLOCK(&gccorecontext->powerlock);
+
+	if (gccorecontext->gcpower == GCPWR_ON) {
+		/* Reset cycle counter and sleep. */
+		gc_write_reg(GC_TOTAL_CYCLES_Address, 0);
+		msleep(seccount * 1000);
+
+		/* Read the cycle counter and compute the speed. */
+		cyclecount = gc_read_reg(GC_TOTAL_CYCLES_Address);
+		speedmhz = cyclecount / 1000 / 1000 / seccount;
+	}
+
+	GCUNLOCK(&gccorecontext->powerlock);
+
+	return speedmhz;
+}
 
 /*******************************************************************************
  * Public API.
diff --git a/drivers/misc/gcx/gccore/gcmain.h b/drivers/misc/gcx/gccore/gcmain.h
index 1c4ffa1..e2931d4 100644
--- a/drivers/misc/gcx/gccore/gcmain.h
+++ b/drivers/misc/gcx/gccore/gcmain.h
@@ -109,5 +109,6 @@ void gc_write_reg(unsigned int address, unsigned int data);
 enum gcpower gcpwr_get(void);
 void gcpwr_set(struct gccorecontext *gccorecontext, enum gcpower gcpower);
 void gcpwr_reset(struct gccorecontext *gccorecontext);
+unsigned int gcpwr_get_speed(void);
 
 #endif