omap: opp: add OMAP3 OPP table data and common init

Add OPP data for OMAP34xx and OMAP36xx and initialization functions
to populate OPP tables based on current SoC.
introduce an OMAP generic opp initialization routine which OMAP3
and OMAP4+ SoCs can use to register their OPP definitions.

Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

arch/arm/mach-omap2/opp.c

@@ -0,0 +1,93 @@
+/*
+ * OMAP SoC specific OPP wrapper function
+ *
+ * Copyright (C) 2009-2010 Texas Instruments Incorporated - http://www.ti.com/
+ *	Nishanth Menon
+ *	Kevin Hilman
+ * Copyright (C) 2010 Nokia Corporation.
+ *      Eduardo Valentin
+ *
+ * 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.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#include <linux/module.h>
+#include <linux/opp.h>
+
+#include <plat/omap_device.h>
+
+#include "omap_opp_data.h"
+
+/* Temp variable to allow multiple calls */
+static u8 __initdata omap_table_init;
+
+/**
+ * omap_init_opp_table() - Initialize opp table as per the CPU type
+ * @opp_def:		opp default list for this silicon
+ * @opp_def_size:	number of opp entries for this silicon
+ *
+ * Register the initial OPP table with the OPP library based on the CPU
+ * type. This is meant to be used only by SoC specific registration.
+ */
+int __init omap_init_opp_table(struct omap_opp_def *opp_def,
+		u32 opp_def_size)
+{
+	int i, r;
+
+	if (!opp_def || !opp_def_size) {
+		pr_err("%s: invalid params!\n", __func__);
+		return -EINVAL;
+	}
+
+	/*
+	 * Initialize only if not already initialized even if the previous
+	 * call failed, because, no reason we'd succeed again.
+	 */
+	if (omap_table_init)
+		return -EEXIST;
+	omap_table_init = 1;
+
+	/* Lets now register with OPP library */
+	for (i = 0; i < opp_def_size; i++) {
+		struct omap_hwmod *oh;
+		struct device *dev;
+
+		if (!opp_def->hwmod_name) {
+			pr_err("%s: NULL name of omap_hwmod, failing [%d].\n",
+				__func__, i);
+			return -EINVAL;
+		}
+		oh = omap_hwmod_lookup(opp_def->hwmod_name);
+		if (!oh || !oh->od) {
+			pr_warn("%s: no hwmod or odev for %s, [%d] "
+				"cannot add OPPs.\n", __func__,
+				opp_def->hwmod_name, i);
+			return -EINVAL;
+		}
+		dev = &oh->od->pdev.dev;
+
+		r = opp_add(dev, opp_def->freq, opp_def->u_volt);
+		if (r) {
+			dev_err(dev, "%s: add OPP %ld failed for %s [%d] "
+				"result=%d\n",
+			       __func__, opp_def->freq,
+			       opp_def->hwmod_name, i, r);
+		} else {
+			if (!opp_def->default_available)
+				r = opp_disable(dev, opp_def->freq);
+			if (r)
+				dev_err(dev, "%s: disable %ld failed for %s "
+					"[%d] result=%d\n",
+					__func__, opp_def->freq,
+					opp_def->hwmod_name, i, r);
+		}
+		opp_def++;
+	}
+
+	return 0;
+}