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 */ |
21 | static void __iomem *cm_base; |
22 | |
23 | static 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 | |
34 | static 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 | |
40 | static 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 | |
51 | static 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 | }; |
56 | static 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 | |
86 | static void __init of_integrator_cm_osc_setup(struct device_node *np) |
87 | { |
88 | cm_osc_setup(np, desc: &cm_auxosc_desc); |
89 | } |
90 | CLK_OF_DECLARE(integrator_cm_auxosc_clk, |
91 | "arm,integrator-cm-auxosc" , of_integrator_cm_osc_setup); |
92 | |
93 | static void __init of_versatile_cm_osc_setup(struct device_node *np) |
94 | { |
95 | cm_osc_setup(np, desc: &versatile_auxosc_desc); |
96 | } |
97 | CLK_OF_DECLARE(versatile_cm_auxosc_clk, |
98 | "arm,versatile-cm-auxosc" , of_versatile_cm_osc_setup); |
99 | |