1 files changed, 124 insertions, 0 deletions
diff --git a/drivers/clk/socfpga/clk-pll.c b/drivers/clk/socfpga/clk-pll.c
new file mode 100644
index 000000000..dcb573d44
--- /dev/null
+++ b/drivers/clk/socfpga/clk-pll.c
@@ -0,0 +1,124 @@
+// 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 <linux/of_address.h>
+
+#include "clk.h"
+
+/* Clock bypass bits */
+#define MAINPLL_BYPASS		(1<<0)
+#define SDRAMPLL_BYPASS		(1<<1)
+#define SDRAMPLL_SRC_BYPASS	(1<<2)
+#define PERPLL_BYPASS		(1<<3)
+#define PERPLL_SRC_BYPASS	(1<<4)
+
+#define SOCFPGA_PLL_BG_PWRDWN		0
+#define SOCFPGA_PLL_EXT_ENA		1
+#define SOCFPGA_PLL_PWR_DOWN		2
+#define SOCFPGA_PLL_DIVF_MASK		0x0000FFF8
+#define SOCFPGA_PLL_DIVF_SHIFT		3
+#define SOCFPGA_PLL_DIVQ_MASK		0x003F0000
+#define SOCFPGA_PLL_DIVQ_SHIFT		16
+
+#define CLK_MGR_PLL_CLK_SRC_SHIFT	22
+#define CLK_MGR_PLL_CLK_SRC_MASK	0x3
+
+#define to_socfpga_clk(p) container_of(p, struct socfpga_pll, hw.hw)
+
+void __iomem *clk_mgr_base_addr;
+
+static unsigned long clk_pll_recalc_rate(struct clk_hw *hwclk,
+					 unsigned long parent_rate)
+{
+	struct socfpga_pll *socfpgaclk = to_socfpga_clk(hwclk);
+	unsigned long divf, divq, reg;
+	unsigned long long vco_freq;
+	unsigned long bypass;
+
+	reg = readl(socfpgaclk->hw.reg);
+	bypass = readl(clk_mgr_base_addr + CLKMGR_BYPASS);
+	if (bypass & MAINPLL_BYPASS)
+		return parent_rate;
+
+	divf = (reg & SOCFPGA_PLL_DIVF_MASK) >> SOCFPGA_PLL_DIVF_SHIFT;
+	divq = (reg & SOCFPGA_PLL_DIVQ_MASK) >> SOCFPGA_PLL_DIVQ_SHIFT;
+	vco_freq = (unsigned long long)parent_rate * (divf + 1);
+	do_div(vco_freq, (1 + divq));
+	return (unsigned long)vco_freq;
+}
+
+static u8 clk_pll_get_parent(struct clk_hw *hwclk)
+{
+	u32 pll_src;
+	struct socfpga_pll *socfpgaclk = to_socfpga_clk(hwclk);
+
+	pll_src = readl(socfpgaclk->hw.reg);
+	return (pll_src >> CLK_MGR_PLL_CLK_SRC_SHIFT) &
+			CLK_MGR_PLL_CLK_SRC_MASK;
+}
+
+static const struct clk_ops clk_pll_ops = {
+	.recalc_rate = clk_pll_recalc_rate,
+	.get_parent = clk_pll_get_parent,
+};
+
+static __init struct clk_hw *__socfpga_pll_init(struct device_node *node,
+	const struct clk_ops *ops)
+{
+	u32 reg;
+	struct clk_hw *hw_clk;
+	struct socfpga_pll *pll_clk;
+	const char *clk_name = node->name;
+	const char *parent_name[SOCFPGA_MAX_PARENTS];
+	struct clk_init_data init;
+	struct device_node *clkmgr_np;
+	int rc;
+	int err;
+
+	of_property_read_u32(node, "reg", &reg);
+
+	pll_clk = kzalloc(sizeof(*pll_clk), GFP_KERNEL);
+	if (WARN_ON(!pll_clk))
+		return NULL;
+
+	clkmgr_np = of_find_compatible_node(NULL, NULL, "altr,clk-mgr");
+	clk_mgr_base_addr = of_iomap(clkmgr_np, 0);
+	of_node_put(clkmgr_np);
+	BUG_ON(!clk_mgr_base_addr);
+	pll_clk->hw.reg = clk_mgr_base_addr + reg;
+
+	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;
+	pll_clk->hw.hw.init = &init;
+
+	pll_clk->hw.bit_idx = SOCFPGA_PLL_EXT_ENA;
+
+	hw_clk = &pll_clk->hw.hw;
+
+	err = clk_hw_register(NULL, hw_clk);
+	if (err) {
+		kfree(pll_clk);
+		return ERR_PTR(err);
+	}
+	rc = of_clk_add_provider(node, of_clk_src_simple_get, hw_clk);
+	return hw_clk;
+}
+
+void __init socfpga_pll_init(struct device_node *node)
+{
+	__socfpga_pll_init(node, &clk_pll_ops);
+}