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path: root/drivers/clk/imx/clk-cpu.c
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Diffstat (limited to 'drivers/clk/imx/clk-cpu.c')
-rw-r--r--drivers/clk/imx/clk-cpu.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/drivers/clk/imx/clk-cpu.c b/drivers/clk/imx/clk-cpu.c
new file mode 100644
index 000000000..cb6ca4cf0
--- /dev/null
+++ b/drivers/clk/imx/clk-cpu.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2014 Lucas Stach <l.stach@pengutronix.de>, Pengutronix
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/export.h>
+#include <linux/slab.h>
+#include "clk.h"
+
+struct clk_cpu {
+ struct clk_hw hw;
+ struct clk *div;
+ struct clk *mux;
+ struct clk *pll;
+ struct clk *step;
+};
+
+static inline struct clk_cpu *to_clk_cpu(struct clk_hw *hw)
+{
+ return container_of(hw, struct clk_cpu, hw);
+}
+
+static unsigned long clk_cpu_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_cpu *cpu = to_clk_cpu(hw);
+
+ return clk_get_rate(cpu->div);
+}
+
+static long clk_cpu_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ struct clk_cpu *cpu = to_clk_cpu(hw);
+
+ return clk_round_rate(cpu->pll, rate);
+}
+
+static int clk_cpu_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_cpu *cpu = to_clk_cpu(hw);
+ int ret;
+
+ /* switch to PLL bypass clock */
+ ret = clk_set_parent(cpu->mux, cpu->step);
+ if (ret)
+ return ret;
+
+ /* reprogram PLL */
+ ret = clk_set_rate(cpu->pll, rate);
+ if (ret) {
+ clk_set_parent(cpu->mux, cpu->pll);
+ return ret;
+ }
+ /* switch back to PLL clock */
+ clk_set_parent(cpu->mux, cpu->pll);
+
+ /* Ensure the divider is what we expect */
+ clk_set_rate(cpu->div, rate);
+
+ return 0;
+}
+
+static const struct clk_ops clk_cpu_ops = {
+ .recalc_rate = clk_cpu_recalc_rate,
+ .round_rate = clk_cpu_round_rate,
+ .set_rate = clk_cpu_set_rate,
+};
+
+struct clk_hw *imx_clk_hw_cpu(const char *name, const char *parent_name,
+ struct clk *div, struct clk *mux, struct clk *pll,
+ struct clk *step)
+{
+ struct clk_cpu *cpu;
+ struct clk_hw *hw;
+ struct clk_init_data init;
+ int ret;
+
+ cpu = kzalloc(sizeof(*cpu), GFP_KERNEL);
+ if (!cpu)
+ return ERR_PTR(-ENOMEM);
+
+ cpu->div = div;
+ cpu->mux = mux;
+ cpu->pll = pll;
+ cpu->step = step;
+
+ init.name = name;
+ init.ops = &clk_cpu_ops;
+ init.flags = CLK_IS_CRITICAL;
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+
+ cpu->hw.init = &init;
+ hw = &cpu->hw;
+
+ ret = clk_hw_register(NULL, hw);
+ if (ret) {
+ kfree(cpu);
+ return ERR_PTR(ret);
+ }
+
+ return hw;
+}
+EXPORT_SYMBOL_GPL(imx_clk_hw_cpu);