These changes are the raw update to linux-4.4.6-rt14. Kernel sources
[kvmfornfv.git] / kernel / drivers / clk / versatile / clk-versatile.c
1 /*
2  * Clock driver for the ARM Integrator/AP, Integrator/CP, Versatile AB and
3  * Versatile PB boards.
4  * Copyright (C) 2012 Linus Walleij
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 #include <linux/clk-provider.h>
11 #include <linux/err.h>
12 #include <linux/of.h>
13 #include <linux/of_address.h>
14
15 #include "clk-icst.h"
16
17 #define INTEGRATOR_HDR_LOCK_OFFSET      0x14
18
19 #define VERSATILE_SYS_OSCCLCD_OFFSET    0x1c
20 #define VERSATILE_SYS_LOCK_OFFSET       0x20
21
22 /* Base offset for the core module */
23 static void __iomem *cm_base;
24
25 static const struct icst_params cp_auxosc_params = {
26         .vco_max        = ICST525_VCO_MAX_5V,
27         .vco_min        = ICST525_VCO_MIN,
28         .vd_min         = 8,
29         .vd_max         = 263,
30         .rd_min         = 3,
31         .rd_max         = 65,
32         .s2div          = icst525_s2div,
33         .idx2s          = icst525_idx2s,
34 };
35
36 static const struct clk_icst_desc cm_auxosc_desc __initconst = {
37         .params = &cp_auxosc_params,
38         .vco_offset = 0x1c,
39         .lock_offset = INTEGRATOR_HDR_LOCK_OFFSET,
40 };
41
42 static const struct icst_params versatile_auxosc_params = {
43         .vco_max        = ICST307_VCO_MAX,
44         .vco_min        = ICST307_VCO_MIN,
45         .vd_min         = 4 + 8,
46         .vd_max         = 511 + 8,
47         .rd_min         = 1 + 2,
48         .rd_max         = 127 + 2,
49         .s2div          = icst307_s2div,
50         .idx2s          = icst307_idx2s,
51 };
52
53 static const struct clk_icst_desc versatile_auxosc_desc __initconst = {
54         .params = &versatile_auxosc_params,
55         .vco_offset = VERSATILE_SYS_OSCCLCD_OFFSET,
56         .lock_offset = VERSATILE_SYS_LOCK_OFFSET,
57 };
58 static void __init cm_osc_setup(struct device_node *np,
59                                 const struct clk_icst_desc *desc)
60 {
61         struct clk *clk = ERR_PTR(-EINVAL);
62         const char *clk_name = np->name;
63         const char *parent_name;
64
65         if (!cm_base) {
66                 /* Remap the core module base if not done yet */
67                 struct device_node *parent;
68
69                 parent = of_get_parent(np);
70                 if (!parent) {
71                         pr_err("no parent on core module clock\n");
72                         return;
73                 }
74                 cm_base = of_iomap(parent, 0);
75                 if (!cm_base) {
76                         pr_err("could not remap core module base\n");
77                         return;
78                 }
79         }
80
81         parent_name = of_clk_get_parent_name(np, 0);
82         clk = icst_clk_register(NULL, desc, clk_name, parent_name, cm_base);
83         if (!IS_ERR(clk))
84                 of_clk_add_provider(np, of_clk_src_simple_get, clk);
85 }
86
87 static void __init of_integrator_cm_osc_setup(struct device_node *np)
88 {
89         cm_osc_setup(np, &cm_auxosc_desc);
90 }
91 CLK_OF_DECLARE(integrator_cm_auxosc_clk,
92         "arm,integrator-cm-auxosc", of_integrator_cm_osc_setup);
93
94 static void __init of_versatile_cm_osc_setup(struct device_node *np)
95 {
96         cm_osc_setup(np, &versatile_auxosc_desc);
97 }
98 CLK_OF_DECLARE(versatile_cm_auxosc_clk,
99                "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup);