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tegra_asoc_utils.c

/*
 * tegra_asoc_utils.c - Harmony machine ASoC driver
 *
 * Author: Stephen Warren <swarren@nvidia.com>
 * Copyright (C) 2010 - NVIDIA, Inc.
 *
 * 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 in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/kernel.h>

#include "tegra_asoc_utils.h"

#define PREFIX "ASoC Tegra: "

static struct clk *clk_pll_a;
static struct clk *clk_pll_a_out0;
static struct clk *clk_cdev1;

static int set_baseclock, set_mclk;

int tegra_asoc_utils_set_rate(int srate, int mclk, int *mclk_change)
{
      int new_baseclock;
      int err;

      switch (srate) {
      case 11025:
      case 22050:
      case 44100:
      case 88200:
            new_baseclock = 56448000;
            break;
      case 8000:
      case 16000:
      case 32000:
      case 48000:
      case 64000:
      case 96000:
            new_baseclock = 73728000;
            break;
      default:
            return -EINVAL;
      }

      *mclk_change = ((new_baseclock != set_baseclock) ||
                  (mclk != set_mclk));
      if (!*mclk_change)
          return 0;

      set_baseclock = 0;
      set_mclk = 0;

      clk_disable(clk_cdev1);
      clk_disable(clk_pll_a_out0);
      clk_disable(clk_pll_a);

      err = clk_set_rate(clk_pll_a, new_baseclock);
      if (err) {
            pr_err(PREFIX "Can't set pll_a rate: %d\n", err);
            return err;
      }

      err = clk_set_rate(clk_pll_a_out0, mclk);
      if (err) {
            pr_err(PREFIX "Can't set pll_a_out0 rate: %d\n", err);
            return err;
      }

      /* Don't set cdev1 rate; its locked to pll_a_out0 */

      err = clk_enable(clk_pll_a);
      if (err) {
            pr_err(PREFIX "Can't enable pll_a: %d\n", err);
            return err;
      }

      err = clk_enable(clk_pll_a_out0);
      if (err) {
            pr_err(PREFIX "Can't enable pll_a_out0: %d\n", err);
            return err;
      }

      err = clk_enable(clk_cdev1);
      if (err) {
            pr_err(PREFIX "Can't enable cdev1: %d\n", err);
            return err;
      }

      set_baseclock = new_baseclock;
      set_mclk = mclk;

      return 0;
}

int tegra_asoc_utils_init(void)
{
      int ret;

      clk_pll_a = clk_get_sys(NULL, "pll_a");
      if (IS_ERR(clk_pll_a)) {
            pr_err(PREFIX "Can't retrieve clk pll_a\n");
            ret = PTR_ERR(clk_pll_a);
            goto err;
      }

      clk_pll_a_out0 = clk_get_sys(NULL, "pll_a_out0");
      if (IS_ERR(clk_pll_a_out0)) {
            pr_err(PREFIX "Can't retrieve clk pll_a_out0\n");
            ret = PTR_ERR(clk_pll_a_out0);
            goto err_put_pll_a;
      }

      clk_cdev1 = clk_get_sys(NULL, "cdev1");
      if (IS_ERR(clk_cdev1)) {
            pr_err(PREFIX "Can't retrieve clk cdev1\n");
            ret = PTR_ERR(clk_cdev1);
            goto err_put_pll_a_out0;
      }

      return 0;

err_put_pll_a_out0:
      clk_put(clk_pll_a_out0);
err_put_pll_a:
      clk_put(clk_pll_a);
err:
      return ret;
}

void tegra_asoc_utils_fini(void)
{
      clk_put(clk_cdev1);
      clk_put(clk_pll_a_out0);
      clk_put(clk_pll_a);
}


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