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/clk.h>
12#include <linux/clkdev.h>
13#include <linux/err.h>
14#include <linux/of.h>
15#include <linux/of_address.h>
16
17#include "clk-icst.h"
18
19#define INTEGRATOR_HDR_LOCK_OFFSET	0x14
20
21#define VERSATILE_SYS_OSCCLCD_OFFSET	0x1c
22#define VERSATILE_SYS_LOCK_OFFSET	0x20
23
24/* Base offset for the core module */
25static void __iomem *cm_base;
26
27static const struct icst_params cp_auxosc_params = {
28	.vco_max	= ICST525_VCO_MAX_5V,
29	.vco_min	= ICST525_VCO_MIN,
30	.vd_min 	= 8,
31	.vd_max 	= 263,
32	.rd_min 	= 3,
33	.rd_max 	= 65,
34	.s2div		= icst525_s2div,
35	.idx2s		= icst525_idx2s,
36};
37
38static const struct clk_icst_desc __initdata cm_auxosc_desc = {
39	.params = &cp_auxosc_params,
40	.vco_offset = 0x1c,
41	.lock_offset = INTEGRATOR_HDR_LOCK_OFFSET,
42};
43
44static const struct icst_params versatile_auxosc_params = {
45	.vco_max	= ICST307_VCO_MAX,
46	.vco_min	= ICST307_VCO_MIN,
47	.vd_min		= 4 + 8,
48	.vd_max		= 511 + 8,
49	.rd_min		= 1 + 2,
50	.rd_max		= 127 + 2,
51	.s2div		= icst307_s2div,
52	.idx2s		= icst307_idx2s,
53};
54
55static const struct clk_icst_desc versatile_auxosc_desc __initconst = {
56	.params = &versatile_auxosc_params,
57	.vco_offset = VERSATILE_SYS_OSCCLCD_OFFSET,
58	.lock_offset = VERSATILE_SYS_LOCK_OFFSET,
59};
60static void __init cm_osc_setup(struct device_node *np,
61				const struct clk_icst_desc *desc)
62{
63	struct clk *clk = ERR_PTR(-EINVAL);
64	const char *clk_name = np->name;
65	const char *parent_name;
66
67	if (!cm_base) {
68		/* Remap the core module base if not done yet */
69		struct device_node *parent;
70
71		parent = of_get_parent(np);
72		if (!parent) {
73			pr_err("no parent on core module clock\n");
74			return;
75		}
76		cm_base = of_iomap(parent, 0);
77		if (!cm_base) {
78			pr_err("could not remap core module base\n");
79			return;
80		}
81	}
82
83	parent_name = of_clk_get_parent_name(np, 0);
84	clk = icst_clk_register(NULL, desc, clk_name, parent_name, cm_base);
85	if (!IS_ERR(clk))
86		of_clk_add_provider(np, of_clk_src_simple_get, clk);
87}
88
89static void __init of_integrator_cm_osc_setup(struct device_node *np)
90{
91	cm_osc_setup(np, &cm_auxosc_desc);
92}
93CLK_OF_DECLARE(integrator_cm_auxosc_clk,
94	"arm,integrator-cm-auxosc", of_integrator_cm_osc_setup);
95
96static void __init of_versatile_cm_osc_setup(struct device_node *np)
97{
98	cm_osc_setup(np, &versatile_auxosc_desc);
99}
100CLK_OF_DECLARE(versatile_cm_auxosc_clk,
101	       "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup);
102