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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/clk/clk-moxart.c
2 * MOXA ART SoCs clock driver.
4 * Copyright (C) 2013 Jonas Jensen
6 * Jonas Jensen <jonas.jensen@gmail.com>
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.
13 #include <linux/clk.h>
14 #include <linux/clk-provider.h>
16 #include <linux/of_address.h>
17 #include <linux/clkdev.h>
19 static void __init
moxart_of_pll_clk_init(struct device_node
*node
)
21 static void __iomem
*base
;
22 struct clk
*clk
, *ref_clk
;
24 const char *name
= node
->name
;
25 const char *parent_name
;
27 of_property_read_string(node
, "clock-output-names", &name
);
28 parent_name
= of_clk_get_parent_name(node
, 0);
30 base
= of_iomap(node
, 0);
32 pr_err("%s: of_iomap failed\n", node
->full_name
);
36 mul
= readl(base
+ 0x30) >> 3 & 0x3f;
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
);
45 clk
= clk_register_fixed_factor(NULL
, name
, parent_name
, 0, mul
, 1);
47 pr_err("%s: failed to register clock\n", node
->full_name
);
51 clk_register_clkdev(clk
, NULL
, name
);
52 of_clk_add_provider(node
, of_clk_src_simple_get
, clk
);
54 CLK_OF_DECLARE(moxart_pll_clock
, "moxa,moxart-pll-clock",
55 moxart_of_pll_clk_init
);
57 static void __init
moxart_of_apb_clk_init(struct device_node
*node
)
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
;
66 of_property_read_string(node
, "clock-output-names", &name
);
67 parent_name
= of_clk_get_parent_name(node
, 0);
69 base
= of_iomap(node
, 0);
71 pr_err("%s: of_iomap failed\n", node
->full_name
);
75 val
= readl(base
+ 0xc) >> 4 & 0x7;
80 div
= div_idx
[val
] * 2;
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
);
88 clk
= clk_register_fixed_factor(NULL
, name
, parent_name
, 0, 1, div
);
90 pr_err("%s: failed to register clock\n", node
->full_name
);
94 clk_register_clkdev(clk
, NULL
, name
);
95 of_clk_add_provider(node
, of_clk_src_simple_get
, clk
);
97 CLK_OF_DECLARE(moxart_apb_clock
, "moxa,moxart-apb-clock",
98 moxart_of_apb_clk_init
);