OMAP3: PM: Adding smartreflex device file.

This patch adds support for device registration of various
smartreflex module present in the system. This patch introduces
the platform data for smartreflex devices which include
the efused n-target vaules, a parameter to indicate
whether smartreflex autocompensation needs to be
enabled on init or not. An API
omap_enable_smartreflex_on_init is provided for the
board files to enable smartreflex autocompensation during
system boot up.

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

arch/arm/mach-omap2/Makefile

@@ -62,7 +62,7 @@ obj-$(CONFIG_ARCH_OMAP3)		+= pm34xx.o sleep34xx.o voltage.o \
 					   cpuidle34xx.o pm_bus.o
 obj-$(CONFIG_ARCH_OMAP4)		+= pm44xx.o pm_bus.o
 obj-$(CONFIG_PM_DEBUG)			+= pm-debug.o
-obj-$(CONFIG_OMAP_SMARTREFLEX)          += smartreflex.o
+obj-$(CONFIG_OMAP_SMARTREFLEX)          += sr_device.o smartreflex.o
 
 AFLAGS_sleep24xx.o			:=-Wa,-march=armv6
 AFLAGS_sleep34xx.o			:=-Wa,-march=armv7-a

arch/arm/mach-omap2/pm.c

@@ -21,6 +21,7 @@
 
 #include "powerdomain.h"
 #include "clockdomain.h"
+#include "pm.h"
 
 static struct omap_device_pm_latency *pm_lats;
 
@@ -167,6 +168,7 @@ postcore_initcall(omap2_common_pm_init);
 static int __init omap2_common_pm_late_init(void)
 {
 	omap_voltage_late_init();
+	omap_devinit_smartreflex();
 
 	return 0;
 }

arch/arm/mach-omap2/pm.h

@@ -11,6 +11,8 @@
 #ifndef __ARCH_ARM_MACH_OMAP2_PM_H
 #define __ARCH_ARM_MACH_OMAP2_PM_H
 
+#include <linux/err.h>
+
 #include "powerdomain.h"
 
 extern void *omap3_secure_ram_storage;
@@ -110,4 +112,16 @@ extern void enable_omap3630_toggle_l2_on_restore(void);
 static inline void enable_omap3630_toggle_l2_on_restore(void) { }
 #endif		/* defined(CONFIG_PM) && defined(CONFIG_ARCH_OMAP3) */
 
+#ifdef CONFIG_OMAP_SMARTREFLEX
+extern int omap_devinit_smartreflex(void);
+extern void omap_enable_smartreflex_on_init(void);
+#else
+static inline int omap_devinit_smartreflex(void)
+{
+	return -EINVAL;
+}
+
+static inline void omap_enable_smartreflex_on_init(void) {}
+#endif
+
 #endif

arch/arm/mach-omap2/sr_device.c

@@ -0,0 +1,131 @@
+/*
+ * OMAP3/OMAP4 smartreflex device file
+ *
+ * Author: Thara Gopinath	<thara@ti.com>
+ *
+ * Based originally on code from smartreflex.c
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ * Thara Gopinath <thara@ti.com>
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ * Kalle Jokiniemi
+ *
+ * Copyright (C) 2007 Texas Instruments, Inc.
+ * Lesly A M <x0080970@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/slab.h>
+
+#include <plat/omap_device.h>
+#include <plat/smartreflex.h>
+#include <plat/voltage.h>
+
+#include "control.h"
+
+static bool sr_enable_on_init;
+
+static struct omap_device_pm_latency omap_sr_latency[] = {
+	{
+		.deactivate_func = omap_device_idle_hwmods,
+		.activate_func	 = omap_device_enable_hwmods,
+		.flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST
+	},
+};
+
+/* Read EFUSE values from control registers for OMAP3430 */
+static void __init sr_set_nvalues(struct omap_volt_data *volt_data,
+				struct omap_sr_data *sr_data)
+{
+	struct omap_sr_nvalue_table *nvalue_table;
+	int i, count = 0;
+
+	while (volt_data[count].volt_nominal)
+		count++;
+
+	nvalue_table = kzalloc(sizeof(struct omap_sr_nvalue_table)*count,
+			GFP_KERNEL);
+
+	for (i = 0; i < count; i++) {
+		u32 v = omap_ctrl_readl(volt_data[i].sr_efuse_offs);
+
+		nvalue_table[i].efuse_offs = volt_data[i].sr_efuse_offs;
+		nvalue_table[i].nvalue = v;
+	}
+
+	sr_data->nvalue_table = nvalue_table;
+	sr_data->nvalue_count = count;
+}
+
+static int sr_dev_init(struct omap_hwmod *oh, void *user)
+{
+	struct omap_sr_data *sr_data;
+	struct omap_device *od;
+	struct omap_volt_data *volt_data;
+	char *name = "smartreflex";
+	static int i;
+
+	sr_data = kzalloc(sizeof(struct omap_sr_data), GFP_KERNEL);
+	if (!sr_data) {
+		pr_err("%s: Unable to allocate memory for %s sr_data.Error!\n",
+			__func__, oh->name);
+		return -ENOMEM;
+	}
+
+	if (!oh->vdd_name) {
+		pr_err("%s: No voltage domain specified for %s."
+			"Cannot initialize\n", __func__, oh->name);
+		goto exit;
+	}
+
+	sr_data->ip_type = oh->class->rev;
+	sr_data->senn_mod = 0x1;
+	sr_data->senp_mod = 0x1;
+
+	sr_data->voltdm = omap_voltage_domain_lookup(oh->vdd_name);
+	if (IS_ERR(sr_data->voltdm)) {
+		pr_err("%s: Unable to get voltage domain pointer for VDD %s\n",
+			__func__, oh->vdd_name);
+		goto exit;
+	}
+
+	omap_voltage_get_volttable(sr_data->voltdm, &volt_data);
+	if (!volt_data) {
+		pr_warning("%s: No Voltage table registerd fo VDD%d."
+			"Something really wrong\n\n", __func__, i + 1);
+		goto exit;
+	}
+
+	sr_set_nvalues(volt_data, sr_data);
+
+	sr_data->enable_on_init = sr_enable_on_init;
+
+	od = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data),
+			       omap_sr_latency,
+			       ARRAY_SIZE(omap_sr_latency), 0);
+	if (IS_ERR(od))
+		pr_warning("%s: Could not build omap_device for %s: %s.\n\n",
+			__func__, name, oh->name);
+exit:
+	i++;
+	kfree(sr_data);
+	return 0;
+}
+
+/*
+ * API to be called from board files to enable smartreflex
+ * autocompensation at init.
+ */
+void __init omap_enable_smartreflex_on_init(void)
+{
+	sr_enable_on_init = true;
+}
+
+int __init omap_devinit_smartreflex(void)
+{
+	return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);
+}