2 * Copyright 2011-2012 Calxeda, Inc.
3 * Copyright (C) 2012-2013 Altera Corporation <www.altera.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * Based from clk-highbank.c
18 #include <linux/clk.h>
19 #include <linux/clkdev.h>
20 #include <linux/clk-provider.h>
26 #define to_socfpga_periph_clk(p) container_of(p, struct socfpga_periph_clk, hw.hw)
28 static unsigned long clk_periclk_recalc_rate(struct clk_hw *hwclk,
29 unsigned long parent_rate)
31 struct socfpga_periph_clk *socfpgaclk = to_socfpga_periph_clk(hwclk);
34 if (socfpgaclk->fixed_div)
35 div = socfpgaclk->fixed_div;
37 div = ((readl(socfpgaclk->hw.reg) & 0x1ff) + 1);
39 return parent_rate / div;
42 static const struct clk_ops periclk_ops = {
43 .recalc_rate = clk_periclk_recalc_rate,
46 static __init void __socfpga_periph_init(struct device_node *node,
47 const struct clk_ops *ops)
51 struct socfpga_periph_clk *periph_clk;
52 const char *clk_name = node->name;
53 const char *parent_name;
54 struct clk_init_data init;
58 of_property_read_u32(node, "reg", ®);
60 periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL);
61 if (WARN_ON(!periph_clk))
64 periph_clk->hw.reg = clk_mgr_base_addr + reg;
66 rc = of_property_read_u32(node, "fixed-divider", &fixed_div);
68 periph_clk->fixed_div = 0;
70 periph_clk->fixed_div = fixed_div;
72 of_property_read_string(node, "clock-output-names", &clk_name);
77 parent_name = of_clk_get_parent_name(node, 0);
78 init.parent_names = &parent_name;
81 periph_clk->hw.hw.init = &init;
83 clk = clk_register(NULL, &periph_clk->hw.hw);
84 if (WARN_ON(IS_ERR(clk))) {
88 rc = of_clk_add_provider(node, of_clk_src_simple_get, clk);
91 void __init socfpga_periph_init(struct device_node *node)
93 __socfpga_periph_init(node, &periclk_ops);