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-rw-r--r--sound/soc/tegra/tegra_asoc_utils.c240
1 files changed, 240 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 000000000..1be311c51
--- /dev/null
+++ b/sound/soc/tegra/tegra_asoc_utils.c
@@ -0,0 +1,240 @@
+/*
+ * tegra_asoc_utils.c - Harmony machine ASoC driver
+ *
+ * Author: Stephen Warren <swarren@nvidia.com>
+ * Copyright (C) 2010,2012 - 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/device.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include "tegra_asoc_utils.h"
+
+int tegra_asoc_utils_set_rate(struct tegra_asoc_utils_data *data, int srate,
+ int mclk)
+{
+ int new_baseclock;
+ bool clk_change;
+ int err;
+
+ switch (srate) {
+ case 11025:
+ case 22050:
+ case 44100:
+ case 88200:
+ if (data->soc == TEGRA_ASOC_UTILS_SOC_TEGRA20)
+ new_baseclock = 56448000;
+ else if (data->soc == TEGRA_ASOC_UTILS_SOC_TEGRA30)
+ new_baseclock = 564480000;
+ else
+ new_baseclock = 282240000;
+ break;
+ case 8000:
+ case 16000:
+ case 32000:
+ case 48000:
+ case 64000:
+ case 96000:
+ if (data->soc == TEGRA_ASOC_UTILS_SOC_TEGRA20)
+ new_baseclock = 73728000;
+ else if (data->soc == TEGRA_ASOC_UTILS_SOC_TEGRA30)
+ new_baseclock = 552960000;
+ else
+ new_baseclock = 368640000;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ clk_change = ((new_baseclock != data->set_baseclock) ||
+ (mclk != data->set_mclk));
+ if (!clk_change)
+ return 0;
+
+ data->set_baseclock = 0;
+ data->set_mclk = 0;
+
+ clk_disable_unprepare(data->clk_cdev1);
+ clk_disable_unprepare(data->clk_pll_a_out0);
+ clk_disable_unprepare(data->clk_pll_a);
+
+ err = clk_set_rate(data->clk_pll_a, new_baseclock);
+ if (err) {
+ dev_err(data->dev, "Can't set pll_a rate: %d\n", err);
+ return err;
+ }
+
+ err = clk_set_rate(data->clk_pll_a_out0, mclk);
+ if (err) {
+ dev_err(data->dev, "Can't set pll_a_out0 rate: %d\n", err);
+ return err;
+ }
+
+ /* Don't set cdev1/extern1 rate; it's locked to pll_a_out0 */
+
+ err = clk_prepare_enable(data->clk_pll_a);
+ if (err) {
+ dev_err(data->dev, "Can't enable pll_a: %d\n", err);
+ return err;
+ }
+
+ err = clk_prepare_enable(data->clk_pll_a_out0);
+ if (err) {
+ dev_err(data->dev, "Can't enable pll_a_out0: %d\n", err);
+ return err;
+ }
+
+ err = clk_prepare_enable(data->clk_cdev1);
+ if (err) {
+ dev_err(data->dev, "Can't enable cdev1: %d\n", err);
+ return err;
+ }
+
+ data->set_baseclock = new_baseclock;
+ data->set_mclk = mclk;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tegra_asoc_utils_set_rate);
+
+int tegra_asoc_utils_set_ac97_rate(struct tegra_asoc_utils_data *data)
+{
+ const int pll_rate = 73728000;
+ const int ac97_rate = 24576000;
+ int err;
+
+ clk_disable_unprepare(data->clk_cdev1);
+ clk_disable_unprepare(data->clk_pll_a_out0);
+ clk_disable_unprepare(data->clk_pll_a);
+
+ /*
+ * AC97 rate is fixed at 24.576MHz and is used for both the host
+ * controller and the external codec
+ */
+ err = clk_set_rate(data->clk_pll_a, pll_rate);
+ if (err) {
+ dev_err(data->dev, "Can't set pll_a rate: %d\n", err);
+ return err;
+ }
+
+ err = clk_set_rate(data->clk_pll_a_out0, ac97_rate);
+ if (err) {
+ dev_err(data->dev, "Can't set pll_a_out0 rate: %d\n", err);
+ return err;
+ }
+
+ /* Don't set cdev1/extern1 rate; it's locked to pll_a_out0 */
+
+ err = clk_prepare_enable(data->clk_pll_a);
+ if (err) {
+ dev_err(data->dev, "Can't enable pll_a: %d\n", err);
+ return err;
+ }
+
+ err = clk_prepare_enable(data->clk_pll_a_out0);
+ if (err) {
+ dev_err(data->dev, "Can't enable pll_a_out0: %d\n", err);
+ return err;
+ }
+
+ err = clk_prepare_enable(data->clk_cdev1);
+ if (err) {
+ dev_err(data->dev, "Can't enable cdev1: %d\n", err);
+ return err;
+ }
+
+ data->set_baseclock = pll_rate;
+ data->set_mclk = ac97_rate;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tegra_asoc_utils_set_ac97_rate);
+
+int tegra_asoc_utils_init(struct tegra_asoc_utils_data *data,
+ struct device *dev)
+{
+ int ret;
+
+ data->dev = dev;
+
+ if (of_machine_is_compatible("nvidia,tegra20"))
+ data->soc = TEGRA_ASOC_UTILS_SOC_TEGRA20;
+ else if (of_machine_is_compatible("nvidia,tegra30"))
+ data->soc = TEGRA_ASOC_UTILS_SOC_TEGRA30;
+ else if (of_machine_is_compatible("nvidia,tegra114"))
+ data->soc = TEGRA_ASOC_UTILS_SOC_TEGRA114;
+ else if (of_machine_is_compatible("nvidia,tegra124"))
+ data->soc = TEGRA_ASOC_UTILS_SOC_TEGRA124;
+ else {
+ dev_err(data->dev, "SoC unknown to Tegra ASoC utils\n");
+ return -EINVAL;
+ }
+
+ data->clk_pll_a = clk_get(dev, "pll_a");
+ if (IS_ERR(data->clk_pll_a)) {
+ dev_err(data->dev, "Can't retrieve clk pll_a\n");
+ ret = PTR_ERR(data->clk_pll_a);
+ goto err;
+ }
+
+ data->clk_pll_a_out0 = clk_get(dev, "pll_a_out0");
+ if (IS_ERR(data->clk_pll_a_out0)) {
+ dev_err(data->dev, "Can't retrieve clk pll_a_out0\n");
+ ret = PTR_ERR(data->clk_pll_a_out0);
+ goto err_put_pll_a;
+ }
+
+ data->clk_cdev1 = clk_get(dev, "mclk");
+ if (IS_ERR(data->clk_cdev1)) {
+ dev_err(data->dev, "Can't retrieve clk cdev1\n");
+ ret = PTR_ERR(data->clk_cdev1);
+ goto err_put_pll_a_out0;
+ }
+
+ ret = tegra_asoc_utils_set_rate(data, 44100, 256 * 44100);
+ if (ret)
+ goto err_put_cdev1;
+
+ return 0;
+
+err_put_cdev1:
+ clk_put(data->clk_cdev1);
+err_put_pll_a_out0:
+ clk_put(data->clk_pll_a_out0);
+err_put_pll_a:
+ clk_put(data->clk_pll_a);
+err:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(tegra_asoc_utils_init);
+
+void tegra_asoc_utils_fini(struct tegra_asoc_utils_data *data)
+{
+ clk_put(data->clk_cdev1);
+ clk_put(data->clk_pll_a_out0);
+ clk_put(data->clk_pll_a);
+}
+EXPORT_SYMBOL_GPL(tegra_asoc_utils_fini);
+
+MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
+MODULE_DESCRIPTION("Tegra ASoC utility code");
+MODULE_LICENSE("GPL");