1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Clock driver for the ARM Integrator/AP, Integrator/CP, Versatile AB and
4 * Versatile PB boards.
5 * Copyright (C) 2012 Linus Walleij
6 */
7#include <linux/clk-provider.h>
8#include <linux/err.h>
9#include <linux/of.h>
10#include <linux/of_address.h>
11
12#include "icst.h"
13#include "clk-icst.h"
14
15#define INTEGRATOR_HDR_LOCK_OFFSET	0x14
16
17#define VERSATILE_SYS_OSCCLCD_OFFSET	0x1c
18#define VERSATILE_SYS_LOCK_OFFSET	0x20
19
20/* Base offset for the core module */
21static void __iomem *cm_base;
22
23static const struct icst_params cp_auxosc_params = {
24	.vco_max	= ICST525_VCO_MAX_5V,
25	.vco_min	= ICST525_VCO_MIN,
26	.vd_min 	= 8,
27	.vd_max 	= 263,
28	.rd_min 	= 3,
29	.rd_max 	= 65,
30	.s2div		= icst525_s2div,
31	.idx2s		= icst525_idx2s,
32};
33
34static const struct clk_icst_desc cm_auxosc_desc __initconst = {
35	.params = &cp_auxosc_params,
36	.vco_offset = 0x1c,
37	.lock_offset = INTEGRATOR_HDR_LOCK_OFFSET,
38};
39
40static const struct icst_params versatile_auxosc_params = {
41	.vco_max	= ICST307_VCO_MAX,
42	.vco_min	= ICST307_VCO_MIN,
43	.vd_min		= 4 + 8,
44	.vd_max		= 511 + 8,
45	.rd_min		= 1 + 2,
46	.rd_max		= 127 + 2,
47	.s2div		= icst307_s2div,
48	.idx2s		= icst307_idx2s,
49};
50
51static const struct clk_icst_desc versatile_auxosc_desc __initconst = {
52	.params = &versatile_auxosc_params,
53	.vco_offset = VERSATILE_SYS_OSCCLCD_OFFSET,
54	.lock_offset = VERSATILE_SYS_LOCK_OFFSET,
55};
56static void __init cm_osc_setup(struct device_node *np,
57				const struct clk_icst_desc *desc)
58{
59	struct clk *clk;
60	const char *clk_name = np->name;
61	const char *parent_name;
62
63	if (!cm_base) {
64		/* Remap the core module base if not done yet */
65		struct device_node *parent;
66
67		parent = of_get_parent(np);
68		if (!parent) {
69			pr_err("no parent on core module clock\n");
70			return;
71		}
72		cm_base = of_iomap(parent, 0);
73		of_node_put(parent);
74		if (!cm_base) {
75			pr_err("could not remap core module base\n");
76			return;
77		}
78	}
79
80	parent_name = of_clk_get_parent_name(np, 0);
81	clk = icst_clk_register(NULL, desc, clk_name, parent_name, cm_base);
82	if (!IS_ERR(clk))
83		of_clk_add_provider(np, of_clk_src_simple_get, clk);
84}
85
86static void __init of_integrator_cm_osc_setup(struct device_node *np)
87{
88	cm_osc_setup(np, &cm_auxosc_desc);
89}
90CLK_OF_DECLARE(integrator_cm_auxosc_clk,
91	"arm,integrator-cm-auxosc", of_integrator_cm_osc_setup);
92
93static void __init of_versatile_cm_osc_setup(struct device_node *np)
94{
95	cm_osc_setup(np, &versatile_auxosc_desc);
96}
97CLK_OF_DECLARE(versatile_cm_auxosc_clk,
98	       "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup);
99