[PATCHv2 4/8] 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 and test n-target vaules, module enable/disable
pointers and a parameter to indicate whether smartreflex
autocompensation needs to be enabled on init or not.
Currently auocompensation is enabled on init by default
for OMAP3430 ES3.1 chip.

Signed-off-by: Thara Gopinath <thara@ti.com>
---
 arch/arm/mach-omap2/Makefile    |    2 +-
 arch/arm/mach-omap2/sr_device.c |  185 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 186 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 0754886..f259bb8 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -53,7 +53,7 @@ obj-$(CONFIG_ARCH_OMAP3)		+= pm34xx.o sleep34xx.o voltage.o \
 					   cpuidle34xx.o
 obj-$(CONFIG_ARCH_OMAP4)		+= pm44xx.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/sr_device.c b/arch/arm/mach-omap2/sr_device.c
new file mode 100644
index 0000000..3bd0170
--- /dev/null
+++ b/arch/arm/mach-omap2/sr_device.c
@@ -0,0 +1,185 @@
+/*
+ * 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/control.h>
+#include <plat/omap_hwmod.h>
+#include <plat/omap_device.h>
+#include <plat/opp.h>
+#include <plat/smartreflex.h>
+#include <plat/voltage.h>
+
+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_read_efuse(struct omap_sr_dev_data *dev_data,
+				struct omap_sr_data *sr_data)
+{
+	int i;
+
+	if (!dev_data || !dev_data->volts_supported || !dev_data->volt_data ||
+			!dev_data->efuse_nvalues_offs) {
+		pr_warning("%s: Bad parameters! dev_data = %x,"
+			"dev_data->volts_supported = %x,"
+			"dev_data->volt_data = %x,"
+			"dev_data->efuse_nvalues_offs = %x\n", __func__,
+			(unsigned int)dev_data, dev_data->volts_supported,
+			(unsigned int)dev_data->volt_data,
+			(unsigned int)dev_data->efuse_nvalues_offs);
+		return;
+	}
+
+	/*
+	 * From OMAP3630 onwards there are no efuse registers for senn_mod
+	 * and senp_mod. They have to be 0x1 by default.
+	 */
+	if (!dev_data->efuse_sr_control) {
+		sr_data->senn_mod = 0x1;
+		sr_data->senp_mod = 0x1;
+	} else {
+		sr_data->senn_mod =
+				((omap_ctrl_readl(dev_data->efuse_sr_control) &
+				(0x3 << dev_data->sennenable_shift)) >>
+				dev_data->sennenable_shift);
+		sr_data->senp_mod =
+				((omap_ctrl_readl(dev_data->efuse_sr_control) &
+				(0x3 << dev_data->senpenable_shift)) >>
+				dev_data->senpenable_shift);
+	}
+
+	for (i = 0; i < dev_data->volts_supported; i++)
+		dev_data->volt_data[i].sr_nvalue = omap_ctrl_readl(
+				dev_data->efuse_nvalues_offs[i]);
+}
+
+/*
+ * Hard coded nvalues for testing purposes for OMAP3430,
+ * may cause device to hang!
+ */
+static void __init sr_set_testing_nvalues(struct omap_sr_dev_data *dev_data,
+				struct omap_sr_data *sr_data)
+{
+	int i;
+
+	if (!dev_data || !dev_data->volts_supported ||
+			!dev_data->volt_data || !dev_data->test_nvalues) {
+		pr_warning("%s: Bad parameters! dev_data = %x,"
+			"dev_data->volts_supported = %x,"
+			"dev_data->volt_data = %x,"
+			"dev_data->test_nvalues = %x\n", __func__,
+			(unsigned int)dev_data, dev_data->volts_supported,
+			(unsigned int)dev_data->volt_data,
+			(unsigned int)dev_data->test_nvalues);
+		return;
+	}
+
+	sr_data->senn_mod = dev_data->test_sennenable;
+	sr_data->senp_mod = dev_data->test_senpenable;
+	for (i = 0; i < dev_data->volts_supported; i++)
+		dev_data->volt_data[i].sr_nvalue = dev_data->test_nvalues[i];
+}
+
+static void __init sr_set_nvalues(struct omap_sr_dev_data *dev_data,
+				struct omap_sr_data *sr_data)
+{
+	if (SR_TESTING_NVALUES)
+		sr_set_testing_nvalues(dev_data, sr_data);
+	else
+		sr_read_efuse(dev_data, sr_data);
+}
+
+static int sr_dev_init(struct omap_hwmod *oh, void *user)
+{
+	struct omap_sr_data *sr_data;
+	struct omap_sr_dev_data *sr_dev_data;
+	struct omap_device *od;
+	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;
+	}
+
+	sr_dev_data = (struct omap_sr_dev_data *)oh->dev_attr;
+	if (unlikely(!sr_dev_data)) {
+		pr_err("%s: dev atrribute is NULL\n", __func__);
+		goto exit;
+	}
+
+	/*
+	 * OMAP3430 ES3.1 chips by default come with Efuse burnt
+	 * with parameters required for full functionality of
+	 * smartreflex AVS feature like ntarget values , sennenable
+	 * and senpenable. So enable the SR AVS feature during boot up
+	 * itself if it is a OMAP3430 ES3.1 chip.
+	 */
+	if (cpu_is_omap343x()) {
+		if (omap_rev() == OMAP3430_REV_ES3_1)
+			sr_data->enable_on_init = true;
+		else
+			sr_data->enable_on_init = false;
+	} else {
+		sr_data->enable_on_init = false;
+	}
+	sr_data->device_enable = omap_device_enable;
+	sr_data->device_shutdown = omap_device_shutdown;
+	sr_data->device_idle = omap_device_idle;
+	sr_data->voltdm = omap_voltage_domain_get(sr_dev_data->vdd_name);
+	if (IS_ERR(sr_data->voltdm)) {
+		pr_err("%s: Unable to get voltage domain pointer for VDD %s\n",
+			__func__, sr_dev_data->vdd_name);
+		goto exit;
+	}
+	sr_dev_data->volts_supported = omap_voltage_get_volttable(
+			sr_data->voltdm, &sr_dev_data->volt_data);
+	if (!sr_dev_data->volts_supported) {
+		pr_warning("%s: No Voltage table registerd fo VDD%d."
+			"Something really wrong\n\n", __func__, i + 1);
+		goto exit;
+	}
+	sr_set_nvalues(sr_dev_data, sr_data);
+	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;
+}
+
+static int __init omap_devinit_smartreflex(void)
+{
+	return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);
+}
+device_initcall(omap_devinit_smartreflex);
-- 
1.7.1.GIT