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authorSascha Hauer <s.hauer@pengutronix.de>2017-01-12 09:49:17 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2017-01-19 15:22:59 +0100
commit9a89ed9d281ec1aac0b105456b414bcbda8f4383 (patch)
tree324956ae5795888f4c53d478c6f334572f716d25
parent0ada0c03af9389de862577b86987417d7b12dcc2 (diff)
downloadbarebox-9a89ed9d281ec1aac0b105456b414bcbda8f4383.tar.gz
clk: imx: Add clk-cpu support
Taken from the kernel as of 4.10-rc3. Needed for i.MX7 Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r--drivers/clk/imx/Makefile1
-rw-r--r--drivers/clk/imx/clk-cpu.c110
-rw-r--r--drivers/clk/imx/clk.h3
3 files changed, 114 insertions, 0 deletions
diff --git a/drivers/clk/imx/Makefile b/drivers/clk/imx/Makefile
index 65d7859..636bfdc 100644
--- a/drivers/clk/imx/Makefile
+++ b/drivers/clk/imx/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_COMMON_CLK) += \
clk-pfd.o \
clk-gate2.o \
clk-gate-exclusive.o \
+ clk-cpu.o \
clk.o
obj-$(CONFIG_ARCH_IMX1) += clk-imx1.o
diff --git a/drivers/clk/imx/clk-cpu.c b/drivers/clk/imx/clk-cpu.c
new file mode 100644
index 0000000..bd1749f
--- /dev/null
+++ b/drivers/clk/imx/clk-cpu.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2014 Lucas Stach <l.stach@pengutronix.de>, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <common.h>
+#include <init.h>
+#include <driver.h>
+#include <linux/clk.h>
+#include <io.h>
+#include <linux/clkdev.h>
+#include <linux/err.h>
+#include <malloc.h>
+#include <clock.h>
+
+#include "clk.h"
+
+struct clk_cpu {
+ struct clk clk;
+ struct clk *div;
+ struct clk *mux;
+ struct clk *pll;
+ struct clk *step;
+};
+
+static inline struct clk_cpu *to_clk_cpu(struct clk *clk)
+{
+ return container_of(clk, struct clk_cpu, clk);
+}
+
+static unsigned long clk_cpu_recalc_rate(struct clk *clk,
+ unsigned long parent_rate)
+{
+ struct clk_cpu *cpu = to_clk_cpu(clk);
+
+ return clk_get_rate(cpu->div);
+}
+
+static long clk_cpu_round_rate(struct clk *clk, unsigned long rate,
+ unsigned long *prate)
+{
+ struct clk_cpu *cpu = to_clk_cpu(clk);
+
+ return clk_round_rate(cpu->pll, rate);
+}
+
+static int clk_cpu_set_rate(struct clk *clk, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_cpu *cpu = to_clk_cpu(clk);
+ 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 *imx_clk_cpu(const char *name, const char *parent_name,
+ struct clk *div, struct clk *mux, struct clk *pll,
+ struct clk *step)
+{
+ struct clk_cpu *cpu;
+ int ret;
+
+ cpu = xzalloc(sizeof(*cpu));
+
+ cpu->div = div;
+ cpu->mux = mux;
+ cpu->pll = pll;
+ cpu->step = step;
+
+ cpu->clk.name = name;
+ cpu->clk.ops = &clk_cpu_ops;
+ cpu->clk.flags = 0;
+ cpu->clk.parent_names = &parent_name;
+ cpu->clk.num_parents = 1;
+
+ ret = clk_register(&cpu->clk);
+ if (ret)
+ free(cpu);
+
+ return &cpu->clk;
+}
diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h
index 1dbfbf7..362b159 100644
--- a/drivers/clk/imx/clk.h
+++ b/drivers/clk/imx/clk.h
@@ -125,5 +125,8 @@ struct clk *imx_clk_gate_exclusive(const char *name, const char *parent,
void imx_check_clocks(struct clk *clks[], unsigned int count);
+struct clk *imx_clk_cpu(const char *name, const char *parent_name,
+ struct clk *div, struct clk *mux, struct clk *pll,
+ struct clk *step);
#endif /* __IMX_CLK_H */