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path: root/drivers/clk/tegra/clk-tegra-fixed.c
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-rw-r--r--drivers/clk/tegra/clk-tegra-fixed.c118
1 files changed, 118 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 000000000..77c22cef5
--- /dev/null
+++ b/drivers/clk/tegra/clk-tegra-fixed.c
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2012, 2013, NVIDIA CORPORATION. All rights reserved.
+ */
+
+#include <linux/io.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
+#define OSC_CTRL_MASK (0x3f2 | \
+ (0xf << OSC_CTRL_OSC_FREQ_SHIFT))
+
+static u32 osc_ctrl_ctx;
+
+int __init tegra_osc_clk_init(void __iomem *clk_base, struct tegra_clk *clks,
+ unsigned long *input_freqs, unsigned int num,
+ unsigned int clk_m_div, unsigned long *osc_freq,
+ unsigned long *pll_ref_freq)
+{
+ struct clk *clk, *osc;
+ struct clk **dt_clk;
+ u32 val, pll_ref_div;
+ unsigned osc_idx;
+
+ val = readl_relaxed(clk_base + OSC_CTRL);
+ osc_ctrl_ctx = val & OSC_CTRL_MASK;
+ 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_osc, clks);
+ if (!dt_clk)
+ return 0;
+
+ osc = clk_register_fixed_rate(NULL, "osc", NULL, 0, *osc_freq);
+ *dt_clk = osc;
+
+ /* osc_div2 */
+ dt_clk = tegra_lookup_dt_id(tegra_clk_osc_div2, clks);
+ if (dt_clk) {
+ clk = clk_register_fixed_factor(NULL, "osc_div2", "osc",
+ 0, 1, 2);
+ *dt_clk = clk;
+ }
+
+ /* osc_div4 */
+ dt_clk = tegra_lookup_dt_id(tegra_clk_osc_div4, clks);
+ if (dt_clk) {
+ clk = clk_register_fixed_factor(NULL, "osc_div4", "osc",
+ 0, 1, 4);
+ *dt_clk = clk;
+ }
+
+ dt_clk = tegra_lookup_dt_id(tegra_clk_clk_m, clks);
+ if (!dt_clk)
+ return 0;
+
+ clk = clk_register_fixed_factor(NULL, "clk_m", "osc",
+ 0, 1, clk_m_div);
+ *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, clks);
+ if (!dt_clk)
+ return 0;
+
+ clk = clk_register_fixed_factor(NULL, "pll_ref", "osc",
+ 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, 0, 32768);
+ *dt_clk = clk;
+ }
+}
+
+void tegra_clk_osc_resume(void __iomem *clk_base)
+{
+ u32 val;
+
+ val = readl_relaxed(clk_base + OSC_CTRL) & ~OSC_CTRL_MASK;
+ val |= osc_ctrl_ctx;
+ writel_relaxed(val, clk_base + OSC_CTRL);
+ fence_udelay(2, clk_base);
+}