1 files changed, 99 insertions, 0 deletions
diff --git a/drivers/clk/berlin/berlin2-pll.c b/drivers/clk/berlin/berlin2-pll.c
new file mode 100644
index 000000000..966182071
--- /dev/null
+++ b/drivers/clk/berlin/berlin2-pll.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2014 Marvell Technology Group Ltd.
+ *
+ * Alexandre Belloni <alexandre.belloni@free-electrons.com>
+ * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
+ */
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <asm/div64.h>
+
+#include "berlin2-div.h"
+#include "berlin2-pll.h"
+
+struct berlin2_pll {
+	struct clk_hw hw;
+	void __iomem *base;
+	struct berlin2_pll_map map;
+};
+
+#define to_berlin2_pll(hw) container_of(hw, struct berlin2_pll, hw)
+
+#define SPLL_CTRL0	0x00
+#define SPLL_CTRL1	0x04
+#define SPLL_CTRL2	0x08
+#define SPLL_CTRL3	0x0c
+#define SPLL_CTRL4	0x10
+
+#define FBDIV_MASK	0x1ff
+#define RFDIV_MASK	0x1f
+#define DIVSEL_MASK	0xf
+
+/*
+ * The output frequency formula for the pll is:
+ * clkout = fbdiv / refdiv * parent / vcodiv
+ */
+static unsigned long
+berlin2_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
+{
+	struct berlin2_pll *pll = to_berlin2_pll(hw);
+	struct berlin2_pll_map *map = &pll->map;
+	u32 val, fbdiv, rfdiv, vcodivsel, vcodiv;
+	u64 rate = parent_rate;
+
+	val = readl_relaxed(pll->base + SPLL_CTRL0);
+	fbdiv = (val >> map->fbdiv_shift) & FBDIV_MASK;
+	rfdiv = (val >> map->rfdiv_shift) & RFDIV_MASK;
+	if (rfdiv == 0) {
+		pr_warn("%s has zero rfdiv\n", clk_hw_get_name(hw));
+		rfdiv = 1;
+	}
+
+	val = readl_relaxed(pll->base + SPLL_CTRL1);
+	vcodivsel = (val >> map->divsel_shift) & DIVSEL_MASK;
+	vcodiv = map->vcodiv[vcodivsel];
+	if (vcodiv == 0) {
+		pr_warn("%s has zero vcodiv (index %d)\n",
+			clk_hw_get_name(hw), vcodivsel);
+		vcodiv = 1;
+	}
+
+	rate *= fbdiv * map->mult;
+	do_div(rate, rfdiv * vcodiv);
+
+	return (unsigned long)rate;
+}
+
+static const struct clk_ops berlin2_pll_ops = {
+	.recalc_rate	= berlin2_pll_recalc_rate,
+};
+
+int __init
+berlin2_pll_register(const struct berlin2_pll_map *map,
+		     void __iomem *base, const char *name,
+		     const char *parent_name, unsigned long flags)
+{
+	struct clk_init_data init;
+	struct berlin2_pll *pll;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (!pll)
+		return -ENOMEM;
+
+	/* copy pll_map to allow __initconst */
+	memcpy(&pll->map, map, sizeof(*map));
+	pll->base = base;
+	pll->hw.init = &init;
+	init.name = name;
+	init.ops = &berlin2_pll_ops;
+	init.parent_names = &parent_name;
+	init.num_parents = 1;
+	init.flags = flags;
+
+	return clk_hw_register(NULL, &pll->hw);
+}