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opp.c

/*
 * 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;
}

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