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5a729246 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3cd4a596 TK |
2 | /* |
3 | * OMAP clockdomain support | |
4 | * | |
5 | * Copyright (C) 2013 Texas Instruments, Inc. | |
6 | * | |
7 | * Tero Kristo <t-kristo@ti.com> | |
3cd4a596 TK |
8 | */ |
9 | ||
1b29e601 | 10 | #include <linux/clk.h> |
3cd4a596 TK |
11 | #include <linux/clk-provider.h> |
12 | #include <linux/slab.h> | |
13 | #include <linux/of.h> | |
14 | #include <linux/of_address.h> | |
15 | #include <linux/clk/ti.h> | |
16 | ||
e9e63088 TK |
17 | #include "clock.h" |
18 | ||
3cd4a596 TK |
19 | #undef pr_fmt |
20 | #define pr_fmt(fmt) "%s: " fmt, __func__ | |
21 | ||
bd86cfdc TK |
22 | /** |
23 | * omap2_clkops_enable_clkdm - increment usecount on clkdm of @hw | |
24 | * @hw: struct clk_hw * of the clock being enabled | |
25 | * | |
26 | * Increment the usecount of the clockdomain of the clock pointed to | |
27 | * by @hw; if the usecount is 1, the clockdomain will be "enabled." | |
28 | * Only needed for clocks that don't use omap2_dflt_clk_enable() as | |
29 | * their enable function pointer. Passes along the return value of | |
30 | * clkdm_clk_enable(), -EINVAL if @hw is not associated with a | |
31 | * clockdomain, or 0 if clock framework-based clockdomain control is | |
32 | * not implemented. | |
33 | */ | |
34 | int omap2_clkops_enable_clkdm(struct clk_hw *hw) | |
35 | { | |
36 | struct clk_hw_omap *clk; | |
37 | int ret = 0; | |
38 | ||
39 | clk = to_clk_hw_omap(hw); | |
40 | ||
41 | if (unlikely(!clk->clkdm)) { | |
42 | pr_err("%s: %s: no clkdm set ?!\n", __func__, | |
836ee0f7 | 43 | clk_hw_get_name(hw)); |
bd86cfdc TK |
44 | return -EINVAL; |
45 | } | |
46 | ||
bd86cfdc TK |
47 | if (ti_clk_get_features()->flags & TI_CLK_DISABLE_CLKDM_CONTROL) { |
48 | pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n", | |
836ee0f7 | 49 | __func__, clk_hw_get_name(hw)); |
bd86cfdc TK |
50 | return 0; |
51 | } | |
52 | ||
53 | ret = ti_clk_ll_ops->clkdm_clk_enable(clk->clkdm, hw->clk); | |
54 | WARN(ret, "%s: could not enable %s's clockdomain %s: %d\n", | |
836ee0f7 | 55 | __func__, clk_hw_get_name(hw), clk->clkdm_name, ret); |
bd86cfdc TK |
56 | |
57 | return ret; | |
58 | } | |
59 | ||
60 | /** | |
61 | * omap2_clkops_disable_clkdm - decrement usecount on clkdm of @hw | |
62 | * @hw: struct clk_hw * of the clock being disabled | |
63 | * | |
64 | * Decrement the usecount of the clockdomain of the clock pointed to | |
65 | * by @hw; if the usecount is 0, the clockdomain will be "disabled." | |
66 | * Only needed for clocks that don't use omap2_dflt_clk_disable() as their | |
67 | * disable function pointer. No return value. | |
68 | */ | |
69 | void omap2_clkops_disable_clkdm(struct clk_hw *hw) | |
70 | { | |
71 | struct clk_hw_omap *clk; | |
72 | ||
73 | clk = to_clk_hw_omap(hw); | |
74 | ||
75 | if (unlikely(!clk->clkdm)) { | |
76 | pr_err("%s: %s: no clkdm set ?!\n", __func__, | |
836ee0f7 | 77 | clk_hw_get_name(hw)); |
bd86cfdc TK |
78 | return; |
79 | } | |
80 | ||
bd86cfdc TK |
81 | if (ti_clk_get_features()->flags & TI_CLK_DISABLE_CLKDM_CONTROL) { |
82 | pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n", | |
836ee0f7 | 83 | __func__, clk_hw_get_name(hw)); |
bd86cfdc TK |
84 | return; |
85 | } | |
86 | ||
87 | ti_clk_ll_ops->clkdm_clk_disable(clk->clkdm, hw->clk); | |
88 | } | |
89 | ||
2e1a294c TK |
90 | /** |
91 | * omap2_init_clk_clkdm - look up a clockdomain name, store pointer in clk | |
60b185f1 | 92 | * @hw: Pointer to clk_hw_omap used to obtain OMAP clock struct ptr to use |
2e1a294c TK |
93 | * |
94 | * Convert a clockdomain name stored in a struct clk 'clk' into a | |
95 | * clockdomain pointer, and save it into the struct clk. Intended to be | |
89d079dc | 96 | * called during clk_register(). Returns 0 on success, -EERROR otherwise. |
2e1a294c | 97 | */ |
89d079dc | 98 | int omap2_init_clk_clkdm(struct clk_hw *hw) |
2e1a294c TK |
99 | { |
100 | struct clk_hw_omap *clk = to_clk_hw_omap(hw); | |
101 | struct clockdomain *clkdm; | |
102 | const char *clk_name; | |
103 | ||
104 | if (!clk->clkdm_name) | |
89d079dc | 105 | return 0; |
2e1a294c TK |
106 | |
107 | clk_name = __clk_get_name(hw->clk); | |
108 | ||
109 | clkdm = ti_clk_ll_ops->clkdm_lookup(clk->clkdm_name); | |
110 | if (clkdm) { | |
111 | pr_debug("clock: associated clk %s to clkdm %s\n", | |
112 | clk_name, clk->clkdm_name); | |
113 | clk->clkdm = clkdm; | |
114 | } else { | |
115 | pr_debug("clock: could not associate clk %s to clkdm %s\n", | |
116 | clk_name, clk->clkdm_name); | |
117 | } | |
89d079dc JB |
118 | |
119 | return 0; | |
2e1a294c TK |
120 | } |
121 | ||
3cd4a596 TK |
122 | static void __init of_ti_clockdomain_setup(struct device_node *node) |
123 | { | |
124 | struct clk *clk; | |
125 | struct clk_hw *clk_hw; | |
9e56a7d4 | 126 | const char *clkdm_name = ti_dt_clk_name(node); |
3cd4a596 | 127 | int i; |
921bacfa | 128 | unsigned int num_clks; |
3cd4a596 | 129 | |
f71355b3 | 130 | num_clks = of_clk_get_parent_count(node); |
3cd4a596 TK |
131 | |
132 | for (i = 0; i < num_clks; i++) { | |
133 | clk = of_clk_get(node, i); | |
319f1276 | 134 | if (IS_ERR(clk)) { |
16673931 RH |
135 | pr_err("%s: Failed get %pOF' clock nr %d (%ld)\n", |
136 | __func__, node, i, PTR_ERR(clk)); | |
319f1276 SAS |
137 | continue; |
138 | } | |
98d8a60e | 139 | clk_hw = __clk_get_hw(clk); |
8aa09cf3 | 140 | if (!omap2_clk_is_hw_omap(clk_hw)) { |
3cd4a596 TK |
141 | pr_warn("can't setup clkdm for basic clk %s\n", |
142 | __clk_get_name(clk)); | |
b7a7943f | 143 | clk_put(clk); |
3cd4a596 TK |
144 | continue; |
145 | } | |
3cd4a596 TK |
146 | to_clk_hw_omap(clk_hw)->clkdm_name = clkdm_name; |
147 | omap2_init_clk_clkdm(clk_hw); | |
b7a7943f | 148 | clk_put(clk); |
3cd4a596 TK |
149 | } |
150 | } | |
151 | ||
f375573c | 152 | static const struct of_device_id ti_clkdm_match_table[] __initconst = { |
3cd4a596 TK |
153 | { .compatible = "ti,clockdomain" }, |
154 | { } | |
155 | }; | |
156 | ||
157 | /** | |
158 | * ti_dt_clockdomains_setup - setup device tree clockdomains | |
159 | * | |
160 | * Initializes clockdomain nodes for a SoC. This parses through all the | |
161 | * nodes with compatible = "ti,clockdomain", and add the clockdomain | |
162 | * info for all the clocks listed under these. This function shall be | |
163 | * called after rest of the DT clock init has completed and all | |
164 | * clock nodes have been registered. | |
165 | */ | |
166 | void __init ti_dt_clockdomains_setup(void) | |
167 | { | |
168 | struct device_node *np; | |
169 | for_each_matching_node(np, ti_clkdm_match_table) { | |
170 | of_ti_clockdomain_setup(np); | |
171 | } | |
172 | } |