summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorStephen Warren <swarren@nvidia.com>2011-01-07 22:36:15 -0700
committerMark Brown <broonie@opensource.wolfsonmicro.com>2011-01-10 22:20:47 +0000
commita50a399b8ba169816d8afae66bfd42fbb65b1973 (patch)
tree5e1b7e3bc99e7ccd3c92a247cad7fb37a768f2e4
parent71f78e22146c522b26fc2074fcd9cb81806895b1 (diff)
ASoC: tegra: Machine utility code
Many portions of Tegra ASoC machine drivers will be similar or identical. To avoid cut/paste, this file will act as a repository for all that common code. For now, it solely includes code to reprogram the audio PLL for 44.1KHz- vs. 48KHz-based sample rates. Signed-Off-By: Stephen Warren <swarren@nvidia.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
-rw-r--r--sound/soc/tegra/tegra_asoc_utils.c154
-rw-r--r--sound/soc/tegra/tegra_asoc_utils.h31
2 files changed, 185 insertions, 0 deletions
diff --git a/sound/soc/tegra/tegra_asoc_utils.c b/sound/soc/tegra/tegra_asoc_utils.c
new file mode 100644
index 000000000000..711ab7ff5ced
--- /dev/null
+++ b/sound/soc/tegra/tegra_asoc_utils.c
@@ -0,0 +1,154 @@
+/*
+ * 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_OR_NULL(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_OR_NULL(clk_pll_a_out0)) {
+ pr_err(PREFIX "Can't retrieve clk pll_a_out0\n");
+ ret = PTR_ERR(clk_pll_a_out0);
+ goto err;
+ }
+
+ clk_cdev1 = clk_get_sys(NULL, "cdev1");
+ if (IS_ERR_OR_NULL(clk_cdev1)) {
+ pr_err(PREFIX "Can't retrieve clk cdev1\n");
+ ret = PTR_ERR(clk_cdev1);
+ goto err;
+ }
+
+ return 0;
+
+err:
+ if (!IS_ERR_OR_NULL(clk_cdev1))
+ clk_put(clk_cdev1);
+ if (!IS_ERR_OR_NULL(clk_pll_a_out0))
+ clk_put(clk_pll_a_out0);
+ if (!IS_ERR_OR_NULL(clk_pll_a))
+ clk_put(clk_pll_a);
+ return ret;
+}
+
+void tegra_asoc_utils_fini(void)
+{
+ clk_put(clk_cdev1);
+ clk_put(clk_pll_a_out0);
+ clk_put(clk_pll_a);
+}
+
diff --git a/sound/soc/tegra/tegra_asoc_utils.h b/sound/soc/tegra/tegra_asoc_utils.h
new file mode 100644
index 000000000000..855f8f6e44ca
--- /dev/null
+++ b/sound/soc/tegra/tegra_asoc_utils.h
@@ -0,0 +1,31 @@
+/*
+ * tegra_asoc_utils.h - Definitions for Tegra DAS 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
+ *
+ */
+
+#ifndef __TEGRA_ASOC_UTILS_H__
+#define __TEGRA_ASOC_UTILS_H_
+
+int tegra_asoc_utils_set_rate(int srate, int mclk_rate, int *mclk_change);
+int tegra_asoc_utils_init(void);
+void tegra_asoc_utils_fini(void);
+
+#endif
+