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-rw-r--r--kernel/drivers/clk/pxa/clk-pxa.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/kernel/drivers/clk/pxa/clk-pxa.c b/kernel/drivers/clk/pxa/clk-pxa.c
new file mode 100644
index 000000000..29cee9e8d
--- /dev/null
+++ b/kernel/drivers/clk/pxa/clk-pxa.c
@@ -0,0 +1,108 @@
+/*
+ * Marvell PXA family clocks
+ *
+ * Copyright (C) 2014 Robert Jarzmik
+ *
+ * Common clock code for PXA clocks ("CKEN" type clocks + DT)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ */
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/of.h>
+
+#include <dt-bindings/clock/pxa-clock.h>
+#include "clk-pxa.h"
+
+DEFINE_SPINLOCK(lock);
+
+static struct clk *pxa_clocks[CLK_MAX];
+static struct clk_onecell_data onecell_data = {
+ .clks = pxa_clocks,
+ .clk_num = CLK_MAX,
+};
+
+struct pxa_clk {
+ struct clk_hw hw;
+ struct clk_fixed_factor lp;
+ struct clk_fixed_factor hp;
+ struct clk_gate gate;
+ bool (*is_in_low_power)(void);
+};
+
+#define to_pxa_clk(_hw) container_of(_hw, struct pxa_clk, hw)
+
+static unsigned long cken_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct pxa_clk *pclk = to_pxa_clk(hw);
+ struct clk_fixed_factor *fix;
+
+ if (!pclk->is_in_low_power || pclk->is_in_low_power())
+ fix = &pclk->lp;
+ else
+ fix = &pclk->hp;
+ __clk_hw_set_clk(&fix->hw, hw);
+ return clk_fixed_factor_ops.recalc_rate(&fix->hw, parent_rate);
+}
+
+static struct clk_ops cken_rate_ops = {
+ .recalc_rate = cken_recalc_rate,
+};
+
+static u8 cken_get_parent(struct clk_hw *hw)
+{
+ struct pxa_clk *pclk = to_pxa_clk(hw);
+
+ if (!pclk->is_in_low_power)
+ return 0;
+ return pclk->is_in_low_power() ? 0 : 1;
+}
+
+static struct clk_ops cken_mux_ops = {
+ .get_parent = cken_get_parent,
+ .set_parent = dummy_clk_set_parent,
+};
+
+void __init clkdev_pxa_register(int ckid, const char *con_id,
+ const char *dev_id, struct clk *clk)
+{
+ if (!IS_ERR(clk) && (ckid != CLK_NONE))
+ pxa_clocks[ckid] = clk;
+ if (!IS_ERR(clk))
+ clk_register_clkdev(clk, con_id, dev_id);
+}
+
+int __init clk_pxa_cken_init(const struct desc_clk_cken *clks, int nb_clks)
+{
+ int i;
+ struct pxa_clk *pxa_clk;
+ struct clk *clk;
+
+ for (i = 0; i < nb_clks; i++) {
+ pxa_clk = kzalloc(sizeof(*pxa_clk), GFP_KERNEL);
+ pxa_clk->is_in_low_power = clks[i].is_in_low_power;
+ pxa_clk->lp = clks[i].lp;
+ pxa_clk->hp = clks[i].hp;
+ pxa_clk->gate = clks[i].gate;
+ pxa_clk->gate.lock = &lock;
+ clk = clk_register_composite(NULL, clks[i].name,
+ clks[i].parent_names, 2,
+ &pxa_clk->hw, &cken_mux_ops,
+ &pxa_clk->hw, &cken_rate_ops,
+ &pxa_clk->gate.hw, &clk_gate_ops,
+ clks[i].flags);
+ clkdev_pxa_register(clks[i].ckid, clks[i].con_id,
+ clks[i].dev_id, clk);
+ }
+ return 0;
+}
+
+void __init clk_pxa_dt_common_init(struct device_node *np)
+{
+ of_clk_add_provider(np, of_clk_src_onecell_get, &onecell_data);
+}