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Jonas Jensenc7bb4fc2014-01-28 12:09:11 +01001/*
2 * MOXA ART SoCs clock driver.
3 *
4 * Copyright (C) 2013 Jonas Jensen
5 *
6 * Jonas Jensen <jonas.jensen@gmail.com>
7 *
8 * This file is licensed under the terms of the GNU General Public
9 * License version 2. This program is licensed "as is" without any
10 * warranty of any kind, whether express or implied.
11 */
12
Stephen Boyd67bb5402015-05-01 16:09:33 -070013#include <linux/clk.h>
Jonas Jensenc7bb4fc2014-01-28 12:09:11 +010014#include <linux/clk-provider.h>
15#include <linux/io.h>
16#include <linux/of_address.h>
17#include <linux/clkdev.h>
18
Stephen Boyd61ad23a2015-05-01 16:09:33 -070019static void __init moxart_of_pll_clk_init(struct device_node *node)
Jonas Jensenc7bb4fc2014-01-28 12:09:11 +010020{
21 static void __iomem *base;
22 struct clk *clk, *ref_clk;
23 unsigned int mul;
24 const char *name = node->name;
25 const char *parent_name;
26
27 of_property_read_string(node, "clock-output-names", &name);
28 parent_name = of_clk_get_parent_name(node, 0);
29
30 base = of_iomap(node, 0);
31 if (!base) {
32 pr_err("%s: of_iomap failed\n", node->full_name);
33 return;
34 }
35
36 mul = readl(base + 0x30) >> 3 & 0x3f;
37 iounmap(base);
38
39 ref_clk = of_clk_get(node, 0);
40 if (IS_ERR(ref_clk)) {
41 pr_err("%s: of_clk_get failed\n", node->full_name);
42 return;
43 }
44
45 clk = clk_register_fixed_factor(NULL, name, parent_name, 0, mul, 1);
46 if (IS_ERR(clk)) {
47 pr_err("%s: failed to register clock\n", node->full_name);
48 return;
49 }
50
51 clk_register_clkdev(clk, NULL, name);
52 of_clk_add_provider(node, of_clk_src_simple_get, clk);
53}
54CLK_OF_DECLARE(moxart_pll_clock, "moxa,moxart-pll-clock",
55 moxart_of_pll_clk_init);
56
Stephen Boyd61ad23a2015-05-01 16:09:33 -070057static void __init moxart_of_apb_clk_init(struct device_node *node)
Jonas Jensenc7bb4fc2014-01-28 12:09:11 +010058{
59 static void __iomem *base;
60 struct clk *clk, *pll_clk;
61 unsigned int div, val;
62 unsigned int div_idx[] = { 2, 3, 4, 6, 8};
63 const char *name = node->name;
64 const char *parent_name;
65
66 of_property_read_string(node, "clock-output-names", &name);
67 parent_name = of_clk_get_parent_name(node, 0);
68
69 base = of_iomap(node, 0);
70 if (!base) {
71 pr_err("%s: of_iomap failed\n", node->full_name);
72 return;
73 }
74
75 val = readl(base + 0xc) >> 4 & 0x7;
76 iounmap(base);
77
78 if (val > 4)
79 val = 0;
80 div = div_idx[val] * 2;
81
82 pll_clk = of_clk_get(node, 0);
83 if (IS_ERR(pll_clk)) {
84 pr_err("%s: of_clk_get failed\n", node->full_name);
85 return;
86 }
87
88 clk = clk_register_fixed_factor(NULL, name, parent_name, 0, 1, div);
89 if (IS_ERR(clk)) {
90 pr_err("%s: failed to register clock\n", node->full_name);
91 return;
92 }
93
94 clk_register_clkdev(clk, NULL, name);
95 of_clk_add_provider(node, of_clk_src_simple_get, clk);
96}
97CLK_OF_DECLARE(moxart_apb_clock, "moxa,moxart-apb-clock",
98 moxart_of_apb_clk_init);