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path: root/drivers/clk/at91/clk-system.c
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-rw-r--r--drivers/clk/at91/clk-system.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/clk/at91/clk-system.c b/drivers/clk/at91/clk-system.c
new file mode 100644
index 000000000..80720fd1a
--- /dev/null
+++ b/drivers/clk/at91/clk-system.c
@@ -0,0 +1,140 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/clk/at91_pmc.h>
+#include <linux/of.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+#include "pmc.h"
+
+#define SYSTEM_MAX_ID 31
+
+#define SYSTEM_MAX_NAME_SZ 32
+
+#define to_clk_system(hw) container_of(hw, struct clk_system, hw)
+struct clk_system {
+ struct clk_hw hw;
+ struct regmap *regmap;
+ struct at91_clk_pms pms;
+ u8 id;
+};
+
+static inline int is_pck(int id)
+{
+ return (id >= 8) && (id <= 15);
+}
+
+static inline bool clk_system_ready(struct regmap *regmap, int id)
+{
+ unsigned int status;
+
+ regmap_read(regmap, AT91_PMC_SR, &status);
+
+ return !!(status & (1 << id));
+}
+
+static int clk_system_prepare(struct clk_hw *hw)
+{
+ struct clk_system *sys = to_clk_system(hw);
+
+ regmap_write(sys->regmap, AT91_PMC_SCER, 1 << sys->id);
+
+ if (!is_pck(sys->id))
+ return 0;
+
+ while (!clk_system_ready(sys->regmap, sys->id))
+ cpu_relax();
+
+ return 0;
+}
+
+static void clk_system_unprepare(struct clk_hw *hw)
+{
+ struct clk_system *sys = to_clk_system(hw);
+
+ regmap_write(sys->regmap, AT91_PMC_SCDR, 1 << sys->id);
+}
+
+static int clk_system_is_prepared(struct clk_hw *hw)
+{
+ struct clk_system *sys = to_clk_system(hw);
+ unsigned int status;
+
+ regmap_read(sys->regmap, AT91_PMC_SCSR, &status);
+
+ if (!(status & (1 << sys->id)))
+ return 0;
+
+ if (!is_pck(sys->id))
+ return 1;
+
+ regmap_read(sys->regmap, AT91_PMC_SR, &status);
+
+ return !!(status & (1 << sys->id));
+}
+
+static int clk_system_save_context(struct clk_hw *hw)
+{
+ struct clk_system *sys = to_clk_system(hw);
+
+ sys->pms.status = clk_system_is_prepared(hw);
+
+ return 0;
+}
+
+static void clk_system_restore_context(struct clk_hw *hw)
+{
+ struct clk_system *sys = to_clk_system(hw);
+
+ if (sys->pms.status)
+ clk_system_prepare(&sys->hw);
+}
+
+static const struct clk_ops system_ops = {
+ .prepare = clk_system_prepare,
+ .unprepare = clk_system_unprepare,
+ .is_prepared = clk_system_is_prepared,
+ .save_context = clk_system_save_context,
+ .restore_context = clk_system_restore_context,
+};
+
+struct clk_hw * __init
+at91_clk_register_system(struct regmap *regmap, const char *name,
+ const char *parent_name, u8 id)
+{
+ struct clk_system *sys;
+ struct clk_hw *hw;
+ struct clk_init_data init;
+ int ret;
+
+ if (!parent_name || id > SYSTEM_MAX_ID)
+ return ERR_PTR(-EINVAL);
+
+ sys = kzalloc(sizeof(*sys), GFP_KERNEL);
+ if (!sys)
+ return ERR_PTR(-ENOMEM);
+
+ init.name = name;
+ init.ops = &system_ops;
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+ init.flags = CLK_SET_RATE_PARENT;
+
+ sys->id = id;
+ sys->hw.init = &init;
+ sys->regmap = regmap;
+
+ hw = &sys->hw;
+ ret = clk_hw_register(NULL, &sys->hw);
+ if (ret) {
+ kfree(sys);
+ hw = ERR_PTR(ret);
+ }
+
+ return hw;
+}