Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / clk / tegra / clk-audio-sync.c

diff --git a/kernel/drivers/clk/tegra/clk-audio-sync.c b/kernel/drivers/clk/tegra/clk-audio-sync.c
new file mode 100644 (file)
index 0000000..c0f7843
--- /dev/null
+++ b/kernel/drivers/clk/tegra/clk-audio-sync.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+
+#include "clk.h"
+
+static unsigned long clk_sync_source_recalc_rate(struct clk_hw *hw,
+                                                unsigned long parent_rate)
+{
+       struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);
+
+       return sync->rate;
+}
+
+static long clk_sync_source_round_rate(struct clk_hw *hw, unsigned long rate,
+                                      unsigned long *prate)
+{
+       struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);
+
+       if (rate > sync->max_rate)
+               return -EINVAL;
+       else
+               return rate;
+}
+
+static int clk_sync_source_set_rate(struct clk_hw *hw, unsigned long rate,
+                                   unsigned long parent_rate)
+{
+       struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);
+
+       sync->rate = rate;
+       return 0;
+}
+
+const struct clk_ops tegra_clk_sync_source_ops = {
+       .round_rate = clk_sync_source_round_rate,
+       .set_rate = clk_sync_source_set_rate,
+       .recalc_rate = clk_sync_source_recalc_rate,
+};
+
+struct clk *tegra_clk_register_sync_source(const char *name,
+               unsigned long rate, unsigned long max_rate)
+{
+       struct tegra_clk_sync_source *sync;
+       struct clk_init_data init;
+       struct clk *clk;
+
+       sync = kzalloc(sizeof(*sync), GFP_KERNEL);
+       if (!sync) {
+               pr_err("%s: could not allocate sync source clk\n", __func__);
+               return ERR_PTR(-ENOMEM);
+       }
+
+       sync->rate = rate;
+       sync->max_rate = max_rate;
+
+       init.ops = &tegra_clk_sync_source_ops;
+       init.name = name;
+       init.flags = CLK_IS_ROOT;
+       init.parent_names = NULL;
+       init.num_parents = 0;
+
+       /* Data in .init is copied by clk_register(), so stack variable OK */
+       sync->hw.init = &init;
+
+       clk = clk_register(NULL, &sync->hw);
+       if (IS_ERR(clk))
+               kfree(sync);
+
+       return clk;
+}