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(node: np);
68 if (!parent) {
69 pr_err("no parent on core module clock\n");
70 return;
71 }
72 cm_base = of_iomap(node: parent, index: 0);
73 of_node_put(node: 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, index: 0);
81 clk = icst_clk_register(NULL, desc, name: clk_name, parent_name, base: cm_base);
82 if (!IS_ERR(ptr: clk))
83 of_clk_add_provider(np, clk_src_get: of_clk_src_simple_get, data: clk);
84}
85
86static void __init of_integrator_cm_osc_setup(struct device_node *np)
87{
88 cm_osc_setup(np, desc: &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, desc: &versatile_auxosc_desc);
96}
97CLK_OF_DECLARE(versatile_cm_auxosc_clk,
98 "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup);
99

source code of linux/drivers/clk/versatile/clk-versatile.c