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 */
23static void __iomem *cm_base;
24
25static 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
36static 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
42static 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
53static 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};
58static 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
87static void __init of_integrator_cm_osc_setup(struct device_node *np)
88{
89	cm_osc_setup(np, &cm_auxosc_desc);
90}
91CLK_OF_DECLARE(integrator_cm_auxosc_clk,
92	"arm,integrator-cm-auxosc", of_integrator_cm_osc_setup);
93
94static void __init of_versatile_cm_osc_setup(struct device_node *np)
95{
96	cm_osc_setup(np, &versatile_auxosc_desc);
97}
98CLK_OF_DECLARE(versatile_cm_auxosc_clk,
99	       "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup);
100