1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright 2011-2012 Calxeda, Inc.
4 * Copyright (C) 2012-2013 Altera Corporation <www.altera.com>
6 * Based from clk-highbank.c
8 #include <linux/slab.h>
9 #include <linux/clk-provider.h>
15 #define to_socfpga_periph_clk(p) container_of(p, struct socfpga_periph_clk, hw.hw)
17 static unsigned long clk_periclk_recalc_rate(struct clk_hw *hwclk,
18 unsigned long parent_rate)
20 struct socfpga_periph_clk *socfpgaclk = to_socfpga_periph_clk(hwclk);
23 if (socfpgaclk->fixed_div) {
24 div = socfpgaclk->fixed_div;
26 if (socfpgaclk->div_reg) {
27 val = readl(socfpgaclk->div_reg) >> socfpgaclk->shift;
28 val &= GENMASK(socfpgaclk->width - 1, 0);
29 parent_rate /= (val + 1);
31 div = ((readl(socfpgaclk->hw.reg) & 0x1ff) + 1);
34 return parent_rate / div;
37 static u8 clk_periclk_get_parent(struct clk_hw *hwclk)
41 clk_src = readl(clk_mgr_base_addr + CLKMGR_DBCTRL);
45 static const struct clk_ops periclk_ops = {
46 .recalc_rate = clk_periclk_recalc_rate,
47 .get_parent = clk_periclk_get_parent,
50 static __init void __socfpga_periph_init(struct device_node *node,
51 const struct clk_ops *ops)
55 struct socfpga_periph_clk *periph_clk;
56 const char *clk_name = node->name;
57 const char *parent_name[SOCFPGA_MAX_PARENTS];
58 struct clk_init_data init;
63 of_property_read_u32(node, "reg", ®);
65 periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL);
66 if (WARN_ON(!periph_clk))
69 periph_clk->hw.reg = clk_mgr_base_addr + reg;
71 rc = of_property_read_u32_array(node, "div-reg", div_reg, 3);
73 periph_clk->div_reg = clk_mgr_base_addr + div_reg[0];
74 periph_clk->shift = div_reg[1];
75 periph_clk->width = div_reg[2];
77 periph_clk->div_reg = NULL;
80 rc = of_property_read_u32(node, "fixed-divider", &fixed_div);
82 periph_clk->fixed_div = 0;
84 periph_clk->fixed_div = fixed_div;
86 of_property_read_string(node, "clock-output-names", &clk_name);
92 init.num_parents = of_clk_parent_fill(node, parent_name,
94 init.parent_names = parent_name;
96 periph_clk->hw.hw.init = &init;
98 clk = clk_register(NULL, &periph_clk->hw.hw);
99 if (WARN_ON(IS_ERR(clk))) {
103 rc = of_clk_add_provider(node, of_clk_src_simple_get, clk);
106 void __init socfpga_periph_init(struct device_node *node)
108 __socfpga_periph_init(node, &periclk_ops);