OMAP3: PM: Adding debug support to Voltage and Smartreflex drivers

This patch adds debug support to the voltage and smartreflex drivers.
This means a whole bunch of voltage processor and smartreflex
parameters are now visible through the pm debugfs.
The voltage parameters can be viewed at
        /debug/voltage/vdd_<x>/<parameter>
and the smartreflex parameters can be viewed at
        /debug/voltage/vdd_<x>/smartreflex/<parameter>

Also smartreflex n-target values are now exposed out at
	/debug/voltage/vdd_<x>/smartreflex/nvalue/<voltage>

This is a read-write interface which means user has the
flexibility to change the n-target values for any opp.

Signed-off-by: Thara Gopinath <thara@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

2 files changed, 110 insertions, 2 deletions

diff --git a/arch/arm/mach-omap2/smartreflex.c b/arch/arm/mach-omap2/smartreflex.c
index eee23d0f50de..52a05b336c08 100644
--- a/arch/arm/mach-omap2/smartreflex.c
+++ b/arch/arm/mach-omap2/smartreflex.c
@@ -31,6 +31,7 @@
 #include "pm.h"
 
 #define SMARTREFLEX_NAME_LEN    16
+#define NVALUE_NAME_LEN         40
 #define SR_DISABLE_TIMEOUT      200
 
 struct omap_sr {
@@ -817,8 +818,9 @@ static int __init omap_sr_probe(struct platform_device *pdev)
         struct omap_sr *sr_info = kzalloc(sizeof(struct omap_sr), GFP_KERNEL);
         struct omap_sr_data *pdata = pdev->dev.platform_data;
         struct resource *mem, *irq;
-        struct dentry *vdd_dbg_dir, *dbg_dir;
-        int ret = 0;
+        struct dentry *vdd_dbg_dir, *dbg_dir, *nvalue_dir;
+        struct omap_volt_data *volt_data;
+        int i, ret = 0;
 
         if (!sr_info) {
                 dev_err(&pdev->dev, "%s: unable to allocate sr_info\n",
@@ -897,6 +899,46 @@ static int __init omap_sr_probe(struct platform_device *pdev)
 
         (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUGO, dbg_dir,
                                 (void *)sr_info, &pm_sr_fops);
+        (void) debugfs_create_x32("errweight", S_IRUGO, dbg_dir,
+                        &sr_info->err_weight);
+        (void) debugfs_create_x32("errmaxlimit", S_IRUGO, dbg_dir,
+                        &sr_info->err_maxlimit);
+        (void) debugfs_create_x32("errminlimit", S_IRUGO, dbg_dir,
+                        &sr_info->err_minlimit);
+
+        nvalue_dir = debugfs_create_dir("nvalue", dbg_dir);
+        if (IS_ERR(nvalue_dir)) {
+                dev_err(&pdev->dev, "%s: Unable to create debugfs directory"
+                        "for n-values\n", __func__);
+                return PTR_ERR(nvalue_dir);
+        }
+
+        omap_voltage_get_volttable(sr_info->voltdm, &volt_data);
+        if (!volt_data) {
+                dev_warn(&pdev->dev, "%s: No Voltage table for the"
+                        " corresponding vdd vdd_%s. Cannot create debugfs"
+                        "entries for n-values\n",
+                        __func__, sr_info->voltdm->name);
+                return -ENODATA;
+        }
+
+        for (i = 0; i < sr_info->nvalue_count; i++) {
+                char *name;
+                char volt_name[32];
+
+                name = kzalloc(NVALUE_NAME_LEN + 1, GFP_KERNEL);
+                if (!name) {
+                        dev_err(&pdev->dev, "%s: Unable to allocate memory"
+                                " for n-value directory name\n",  __func__);
+                        return -ENOMEM;
+                }
+
+                strcpy(name, "volt_");
+                sprintf(volt_name, "%d", volt_data[i].volt_nominal);
+                strcat(name, volt_name);
+                (void) debugfs_create_x32(name, S_IRUGO | S_IWUGO, nvalue_dir,
+                                &(sr_info->nvalue_table[i].nvalue));
+        }
 
         return ret;
 
diff --git a/arch/arm/mach-omap2/voltage.c b/arch/arm/mach-omap2/voltage.c
index 875667f130e3..b27fa4f241fd 100644
--- a/arch/arm/mach-omap2/voltage.c
+++ b/arch/arm/mach-omap2/voltage.c
@@ -250,6 +250,47 @@ static void omap3_voltage_write_reg(u32 val, u16 mod, u8 offset)
         omap2_prm_write_mod_reg(val, mod, offset);
 }
 
+/* Voltage debugfs support */
+static int vp_volt_debug_get(void *data, u64 *val)
+{
+        struct omap_vdd_info *vdd = (struct omap_vdd_info *) data;
+        u8 vsel;
+
+        if (!vdd) {
+                pr_warning("Wrong paramater passed\n");
+                return -EINVAL;
+        }
+
+        vsel = vdd->read_reg(vdd->vp_reg.prm_mod, vdd->vp_offs.voltage);
+        pr_notice("curr_vsel = %x\n", vsel);
+
+        if (!vdd->pmic_info->vsel_to_uv) {
+                pr_warning("PMIC function to convert vsel to voltage"
+                        "in uV not registerd\n");
+                return -EINVAL;
+        }
+
+        *val = vdd->pmic_info->vsel_to_uv(vsel);
+        return 0;
+}
+
+static int nom_volt_debug_get(void *data, u64 *val)
+{
+        struct omap_vdd_info *vdd = (struct omap_vdd_info *) data;
+
+        if (!vdd) {
+                pr_warning("Wrong paramater passed\n");
+                return -EINVAL;
+        }
+
+        *val = omap_voltage_get_nom_volt(&vdd->voltdm);
+
+        return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(vp_volt_debug_fops, vp_volt_debug_get, NULL, "%llu\n");
+DEFINE_SIMPLE_ATTRIBUTE(nom_volt_debug_fops, nom_volt_debug_get, NULL,
+                                                                "%llu\n");
 static void vp_latch_vsel(struct omap_vdd_info *vdd)
 {
         u32 vpconfig;
@@ -349,7 +390,32 @@ static void __init vdd_debugfs_init(struct omap_vdd_info *vdd)
                 pr_warning("%s: Unable to create debugfs directory for"
                         " vdd_%s\n", __func__, vdd->voltdm.name);
                 vdd->debug_dir = NULL;
+                return;
         }
+
+        (void) debugfs_create_x16("vp_errorgain", S_IRUGO, vdd->debug_dir,
+                                &(vdd->vp_reg.vpconfig_errorgain));
+        (void) debugfs_create_x16("vp_smpswaittimemin", S_IRUGO,
+                                vdd->debug_dir,
+                                &(vdd->vp_reg.vstepmin_smpswaittimemin));
+        (void) debugfs_create_x8("vp_stepmin", S_IRUGO, vdd->debug_dir,
+                                &(vdd->vp_reg.vstepmin_stepmin));
+        (void) debugfs_create_x16("vp_smpswaittimemax", S_IRUGO,
+                                vdd->debug_dir,
+                                &(vdd->vp_reg.vstepmax_smpswaittimemax));
+        (void) debugfs_create_x8("vp_stepmax", S_IRUGO, vdd->debug_dir,
+                                &(vdd->vp_reg.vstepmax_stepmax));
+        (void) debugfs_create_x8("vp_vddmax", S_IRUGO, vdd->debug_dir,
+                                &(vdd->vp_reg.vlimitto_vddmax));
+        (void) debugfs_create_x8("vp_vddmin", S_IRUGO, vdd->debug_dir,
+                                &(vdd->vp_reg.vlimitto_vddmin));
+        (void) debugfs_create_x16("vp_timeout", S_IRUGO, vdd->debug_dir,
+                                &(vdd->vp_reg.vlimitto_timeout));
+        (void) debugfs_create_file("curr_vp_volt", S_IRUGO, vdd->debug_dir,
+                                (void *) vdd, &vp_volt_debug_fops);
+        (void) debugfs_create_file("curr_nominal_volt", S_IRUGO,
+                                vdd->debug_dir, (void *) vdd,
+                                &nom_volt_debug_fops);
 }
 
 /* Voltage scale and accessory APIs */