[PATCH v6 04/10] OMAP3: PM: Adding smartreflex device file.

[Thara Gopinath <thara@ti.com>]

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>
---
 arch/arm/mach-omap2/Makefile    |    2 +-
 arch/arm/mach-omap2/pm.c        |    2 +
 arch/arm/mach-omap2/pm.h        |   13 ++++
 arch/arm/mach-omap2/sr_device.c |  131 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 147 insertions(+), 1 deletions(-)
 create mode 100644 arch/arm/mach-omap2/sr_device.c

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index b1bead0..4e6adbd 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -61,7 +61,7 @@ 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
diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c
index 22adfb2..a05f590 100644
--- a/arch/arm/mach-omap2/pm.c
+++ b/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;
 
@@ -149,6 +150,7 @@ postcore_initcall(omap2_common_pm_init);
 static int __init omap2_common_pm_late_init(void)
 {
 	omap_voltage_late_init();
+	omap_devinit_smartreflex();
 
 	return 0;
 }
diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
index 419c9d4..77d3ec2 100644
--- a/arch/arm/mach-omap2/pm.h
+++ b/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;
@@ -99,4 +101,15 @@ extern unsigned int save_secure_ram_context_sz;
 extern unsigned int omap24xx_cpu_suspend_sz;
 extern unsigned int omap34xx_cpu_suspend_sz;
 
+#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
diff --git a/arch/arm/mach-omap2/sr_device.c b/arch/arm/mach-omap2/sr_device.c
new file mode 100644
index 0000000..9a3538f
--- /dev/null
+++ b/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);
+}
-- 
1.7.0.4