1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/clk/socfpga/clk-periph.c b/drivers/clk/socfpga/clk-periph.c
new file mode 100644
index 000000000..43707e2d7
--- /dev/null
+++ b/drivers/clk/socfpga/clk-periph.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Copyright 2011-2012 Calxeda, Inc.
+ *  Copyright (C) 2012-2013 Altera Corporation <www.altera.com>
+ *
+ * Based from clk-highbank.c
+ */
+#include <linux/slab.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+
+#include "clk.h"
+
+#define to_socfpga_periph_clk(p) container_of(p, struct socfpga_periph_clk, hw.hw)
+
+static unsigned long clk_periclk_recalc_rate(struct clk_hw *hwclk,
+					     unsigned long parent_rate)
+{
+	struct socfpga_periph_clk *socfpgaclk = to_socfpga_periph_clk(hwclk);
+	u32 div, val;
+
+	if (socfpgaclk->fixed_div) {
+		div = socfpgaclk->fixed_div;
+	} else {
+		if (socfpgaclk->div_reg) {
+			val = readl(socfpgaclk->div_reg) >> socfpgaclk->shift;
+			val &= GENMASK(socfpgaclk->width - 1, 0);
+			parent_rate /= (val + 1);
+		}
+		div = ((readl(socfpgaclk->hw.reg) & 0x1ff) + 1);
+	}
+
+	return parent_rate / div;
+}
+
+static u8 clk_periclk_get_parent(struct clk_hw *hwclk)
+{
+	u32 clk_src;
+
+	clk_src = readl(clk_mgr_base_addr + CLKMGR_DBCTRL);
+	return clk_src & 0x1;
+}
+
+static const struct clk_ops periclk_ops = {
+	.recalc_rate = clk_periclk_recalc_rate,
+	.get_parent = clk_periclk_get_parent,
+};
+
+static __init void __socfpga_periph_init(struct device_node *node,
+	const struct clk_ops *ops)
+{
+	u32 reg;
+	struct clk_hw *hw_clk;
+	struct socfpga_periph_clk *periph_clk;
+	const char *clk_name = node->name;
+	const char *parent_name[SOCFPGA_MAX_PARENTS];
+	struct clk_init_data init;
+	int rc;
+	u32 fixed_div;
+	u32 div_reg[3];
+
+	of_property_read_u32(node, "reg", &reg);
+
+	periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL);
+	if (WARN_ON(!periph_clk))
+		return;
+
+	periph_clk->hw.reg = clk_mgr_base_addr + reg;
+
+	rc = of_property_read_u32_array(node, "div-reg", div_reg, 3);
+	if (!rc) {
+		periph_clk->div_reg = clk_mgr_base_addr + div_reg[0];
+		periph_clk->shift = div_reg[1];
+		periph_clk->width = div_reg[2];
+	} else {
+		periph_clk->div_reg = NULL;
+	}
+
+	rc = of_property_read_u32(node, "fixed-divider", &fixed_div);
+	if (rc)
+		periph_clk->fixed_div = 0;
+	else
+		periph_clk->fixed_div = fixed_div;
+
+	of_property_read_string(node, "clock-output-names", &clk_name);
+
+	init.name = clk_name;
+	init.ops = ops;
+	init.flags = 0;
+
+	init.num_parents = of_clk_parent_fill(node, parent_name,
+					      SOCFPGA_MAX_PARENTS);
+	init.parent_names = parent_name;
+
+	periph_clk->hw.hw.init = &init;
+	hw_clk = &periph_clk->hw.hw;
+
+	if (clk_hw_register(NULL, hw_clk)) {
+		kfree(periph_clk);
+		return;
+	}
+	rc = of_clk_add_provider(node, of_clk_src_simple_get, hw_clk);
+}
+
+void __init socfpga_periph_init(struct device_node *node)
+{
+	__socfpga_periph_init(node, &periclk_ops);
+}