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

[karo-tx-linux.git] / arch / arm / mach-omap2 / opp.c

diff --git a/arch/arm/mach-omap2/opp.c b/arch/arm/mach-omap2/opp.c
new file mode 100644 (file)
index 0000000..ab8b35b
--- /dev/null
+++ b/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;
+}