Logo Search packages:      
Sourcecode: linux version File versions  Download package

sr_device.c

/*
 * 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 <linux/io.h>

#include <plat/omap_device.h>
#include <plat/smartreflex.h>
#include <plat/voltage.h>

#include "control.h"
#include "pm.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;
            /*
             * In OMAP4 the efuse registers are 24 bit aligned.
             * A __raw_readl will fail for non-32 bit aligned address
             * and hence the 8-bit read and shift.
             */
            if (cpu_is_omap44xx()) {
                  u16 offset = volt_data[i].sr_efuse_offs;

                  v = omap_ctrl_readb(offset) |
                        omap_ctrl_readb(offset + 1) << 8 |
                        omap_ctrl_readb(offset + 2) << 16;
            } else {
                   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);
}

Generated by  Doxygen 1.6.0   Back to index