1 files changed, 111 insertions, 0 deletions

diff --git a/drivers/clk/tegra/clk-tegra-fixed.c b/drivers/clk/tegra/clk-tegra-fixed.c
new file mode 100644
index 000000000000..f3b773833429
--- /dev/null
+++ b/drivers/clk/tegra/clk-tegra-fixed.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2012, 2013, 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/io.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/clk/tegra.h>
+
+#include "clk.h"
+#include "clk-id.h"
+
+#define OSC_CTRL                        0x50
+#define OSC_CTRL_OSC_FREQ_SHIFT         28
+#define OSC_CTRL_PLL_REF_DIV_SHIFT      26
+
+int __init tegra_osc_clk_init(void __iomem *clk_base,
+                                struct tegra_clk *tegra_clks,
+                                unsigned long *input_freqs, int num,
+                                unsigned long *osc_freq,
+                                unsigned long *pll_ref_freq)
+{
+        struct clk *clk;
+        struct clk **dt_clk;
+        u32 val, pll_ref_div;
+        unsigned osc_idx;
+
+        val = readl_relaxed(clk_base + OSC_CTRL);
+        osc_idx = val >> OSC_CTRL_OSC_FREQ_SHIFT;
+
+        if (osc_idx < num)
+                *osc_freq = input_freqs[osc_idx];
+        else
+                *osc_freq = 0;
+
+        if (!*osc_freq) {
+                WARN_ON(1);
+                return -EINVAL;
+        }
+
+        dt_clk = tegra_lookup_dt_id(tegra_clk_clk_m, tegra_clks);
+        if (!dt_clk)
+                return 0;
+
+        clk = clk_register_fixed_rate(NULL, "clk_m", NULL, CLK_IS_ROOT,
+                                      *osc_freq);
+        *dt_clk = clk;
+
+        /* pll_ref */
+        val = (val >> OSC_CTRL_PLL_REF_DIV_SHIFT) & 3;
+        pll_ref_div = 1 << val;
+        dt_clk = tegra_lookup_dt_id(tegra_clk_pll_ref, tegra_clks);
+        if (!dt_clk)
+                return 0;
+
+        clk = clk_register_fixed_factor(NULL, "pll_ref", "clk_m",
+                                        0, 1, pll_ref_div);
+        *dt_clk = clk;
+
+        if (pll_ref_freq)
+                *pll_ref_freq = *osc_freq / pll_ref_div;
+
+        return 0;
+}
+
+void __init tegra_fixed_clk_init(struct tegra_clk *tegra_clks)
+{
+        struct clk *clk;
+        struct clk **dt_clk;
+
+        /* clk_32k */
+        dt_clk = tegra_lookup_dt_id(tegra_clk_clk_32k, tegra_clks);
+        if (dt_clk) {
+                clk = clk_register_fixed_rate(NULL, "clk_32k", NULL,
+                                        CLK_IS_ROOT, 32768);
+                *dt_clk = clk;
+        }
+
+        /* clk_m_div2 */
+        dt_clk = tegra_lookup_dt_id(tegra_clk_clk_m_div2, tegra_clks);
+        if (dt_clk) {
+                clk = clk_register_fixed_factor(NULL, "clk_m_div2", "clk_m",
+                                        CLK_SET_RATE_PARENT, 1, 2);
+                *dt_clk = clk;
+        }
+
+        /* clk_m_div4 */
+        dt_clk = tegra_lookup_dt_id(tegra_clk_clk_m_div4, tegra_clks);
+        if (dt_clk) {
+                clk = clk_register_fixed_factor(NULL, "clk_m_div4", "clk_m",
+                                        CLK_SET_RATE_PARENT, 1, 4);
+                *dt_clk = clk;
+        }
+}
+