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path: root/drivers/clk/meson/clk-cpu-dyndiv.c
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Diffstat (limited to 'drivers/clk/meson/clk-cpu-dyndiv.c')
-rw-r--r--drivers/clk/meson/clk-cpu-dyndiv.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/clk/meson/clk-cpu-dyndiv.c b/drivers/clk/meson/clk-cpu-dyndiv.c
new file mode 100644
index 000000000000..36976927fe82
--- /dev/null
+++ b/drivers/clk/meson/clk-cpu-dyndiv.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Copyright (c) 2019 BayLibre, SAS.
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+
+#include "clk-regmap.h"
+#include "clk-cpu-dyndiv.h"
+
+static inline struct meson_clk_cpu_dyndiv_data *
+meson_clk_cpu_dyndiv_data(struct clk_regmap *clk)
+{
+ return (struct meson_clk_cpu_dyndiv_data *)clk->data;
+}
+
+static unsigned long meson_clk_cpu_dyndiv_recalc_rate(struct clk_hw *hw,
+ unsigned long prate)
+{
+ struct clk_regmap *clk = to_clk_regmap(hw);
+ struct meson_clk_cpu_dyndiv_data *data = meson_clk_cpu_dyndiv_data(clk);
+
+ return divider_recalc_rate(hw, prate,
+ meson_parm_read(clk->map, &data->div),
+ NULL, 0, data->div.width);
+}
+
+static long meson_clk_cpu_dyndiv_round_rate(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long *prate)
+{
+ struct clk_regmap *clk = to_clk_regmap(hw);
+ struct meson_clk_cpu_dyndiv_data *data = meson_clk_cpu_dyndiv_data(clk);
+
+ return divider_round_rate(hw, rate, prate, NULL, data->div.width, 0);
+}
+
+static int meson_clk_cpu_dyndiv_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_regmap *clk = to_clk_regmap(hw);
+ struct meson_clk_cpu_dyndiv_data *data = meson_clk_cpu_dyndiv_data(clk);
+ unsigned int val;
+ int ret;
+
+ ret = divider_get_val(rate, parent_rate, NULL, data->div.width, 0);
+ if (ret < 0)
+ return ret;
+
+ val = (unsigned int)ret << data->div.shift;
+
+ /* Write the SYS_CPU_DYN_ENABLE bit before changing the divider */
+ meson_parm_write(clk->map, &data->dyn, 1);
+
+ /* Update the divider while removing the SYS_CPU_DYN_ENABLE bit */
+ return regmap_update_bits(clk->map, data->div.reg_off,
+ SETPMASK(data->div.width, data->div.shift) |
+ SETPMASK(data->dyn.width, data->dyn.shift),
+ val);
+};
+
+const struct clk_ops meson_clk_cpu_dyndiv_ops = {
+ .recalc_rate = meson_clk_cpu_dyndiv_recalc_rate,
+ .round_rate = meson_clk_cpu_dyndiv_round_rate,
+ .set_rate = meson_clk_cpu_dyndiv_set_rate,
+};
+EXPORT_SYMBOL_GPL(meson_clk_cpu_dyndiv_ops);
+
+MODULE_DESCRIPTION("Amlogic CPU Dynamic Clock divider");
+MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
+MODULE_LICENSE("GPL v2");